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Volume 44,Issue 9,2017 Table of Contents
2017, 44(9):1-8.
Abstract:
There are two types of winding in slotless toroidal type winding axial flux permanent magnet machines, one is fanshaped winding, another is rectangle winding. Considering the effect of winding spatial distribution on open circuit back EMF in slotless axial flux permanent magnet machine, the corresponding analytical formulas of back EMF were derived. In order to calculate the end effect function of air gap magnetic field during calculating air gap magnetic field by analytical method, a virtual equivalent linear machine model was built. For verifying the correctness of the analytical formulas, a comparison of back EMF by analytical and FE methods based on a motor design scheme was carried out, the computing results showed that relative error between them was less than 2.1%, the result met the need of engineering. So, the analytical formulas of back EMF could be used as reference for the researchers who designed AFPM machine.
There are two types of winding in slotless toroidal type winding axial flux permanent magnet machines, one is fanshaped winding, another is rectangle winding. Considering the effect of winding spatial distribution on open circuit back EMF in slotless axial flux permanent magnet machine, the corresponding analytical formulas of back EMF were derived. In order to calculate the end effect function of air gap magnetic field during calculating air gap magnetic field by analytical method, a virtual equivalent linear machine model was built. For verifying the correctness of the analytical formulas, a comparison of back EMF by analytical and FE methods based on a motor design scheme was carried out, the computing results showed that relative error between them was less than 2.1%, the result met the need of engineering. So, the analytical formulas of back EMF could be used as reference for the researchers who designed AFPM machine.
2017, 44(9):9-15, 66.
Abstract:
Due to the constraints of electromagnetic, mechanical and thermal, the design of highspeed permanent magnet motor with amorphous alloy core is an integrated process. Based on the method of multiphysics analysis, the influence of amorphous alloy to the motor was analyzed, the stress distribution of interior permanent magnet rotor was studied. Also, the influence of bearing stiffness for critical speed of rotor system was analyzed. In consider of the distribution of loss, thermal analysis was shown. Based on the method of integrated design, a highspeed permanent magnet motor with amorphous alloy core rated as 15 kW, 30 000 r/min was designed and fabricated. Through the test of the motor, the multiphysics field analysis and integrated design was proved feasible and the theory for the design of highspeed permanent magnet motor with amorphous alloy core was provided.
Due to the constraints of electromagnetic, mechanical and thermal, the design of highspeed permanent magnet motor with amorphous alloy core is an integrated process. Based on the method of multiphysics analysis, the influence of amorphous alloy to the motor was analyzed, the stress distribution of interior permanent magnet rotor was studied. Also, the influence of bearing stiffness for critical speed of rotor system was analyzed. In consider of the distribution of loss, thermal analysis was shown. Based on the method of integrated design, a highspeed permanent magnet motor with amorphous alloy core rated as 15 kW, 30 000 r/min was designed and fabricated. Through the test of the motor, the multiphysics field analysis and integrated design was proved feasible and the theory for the design of highspeed permanent magnet motor with amorphous alloy core was provided.
2017, 44(9):16-21.
Abstract:
The stator winding interturn short circuit fault can cause the air gap magnetic field distortion of doublyfed induction generators, which leads to the change of electromagnetic torque. The electromagnetic torque the same as electrical parameters can be used as the fault characteristics. The electromagnetic torque change characteristics before and after stator winding interturn short circuit fault were analyzed based on the energy method, and the multiloop mathematical model of doublyfed induction generators was established to calculate the electromagnetic torque of the normal and different degree of interturn short circuit fault. The harmonic variation characteristics of electromagnetic torque before and after the stator winding interturn short circuit fault were obtained by the spectrum analysis of the simulation results, which verified the correctness of the theoretical analysis. The correlation characteristics between stator winding interturn short circuit fault and electromagnetic torque could be used as the basis for fault diagnosis of doubly fed induction generators.
The stator winding interturn short circuit fault can cause the air gap magnetic field distortion of doublyfed induction generators, which leads to the change of electromagnetic torque. The electromagnetic torque the same as electrical parameters can be used as the fault characteristics. The electromagnetic torque change characteristics before and after stator winding interturn short circuit fault were analyzed based on the energy method, and the multiloop mathematical model of doublyfed induction generators was established to calculate the electromagnetic torque of the normal and different degree of interturn short circuit fault. The harmonic variation characteristics of electromagnetic torque before and after the stator winding interturn short circuit fault were obtained by the spectrum analysis of the simulation results, which verified the correctness of the theoretical analysis. The correlation characteristics between stator winding interturn short circuit fault and electromagnetic torque could be used as the basis for fault diagnosis of doubly fed induction generators.
2017, 44(9):22-28.
Abstract:
Adaptive power motor is a new type of driving motor, which is suitable for urban heavy load electric vehicle, and has the characteristics of speed coupling. For a 6 poles adaptive power motor, the design principle and the suitable operating mode were described. By using electromagnetic theory and motor learning theory knowledge,the power output performance of the adaptive power motor was analyzed and calculated, concluding that the reduced turn working condition under the same speed could save more electric energy on the vehicle, which was verified by the simulation analysis software. At the same time, the results showed that, compared with the full turn working state, the mechanical characteristics of the adaptive power motor operating in the state of reduced turn was more hard. Finally, the correctness of the theoretical calculation and the simulation analysis was proved by the prototype test, which proved that the design model of the motor was feasible.
Adaptive power motor is a new type of driving motor, which is suitable for urban heavy load electric vehicle, and has the characteristics of speed coupling. For a 6 poles adaptive power motor, the design principle and the suitable operating mode were described. By using electromagnetic theory and motor learning theory knowledge,the power output performance of the adaptive power motor was analyzed and calculated, concluding that the reduced turn working condition under the same speed could save more electric energy on the vehicle, which was verified by the simulation analysis software. At the same time, the results showed that, compared with the full turn working state, the mechanical characteristics of the adaptive power motor operating in the state of reduced turn was more hard. Finally, the correctness of the theoretical calculation and the simulation analysis was proved by the prototype test, which proved that the design model of the motor was feasible.
2017, 44(9):29-33.
Abstract:
Based on a novel fourphase fluxconcentrating transverse flux PM machine with passive rotor, taking the 3Dfinite element method as a powerful tool, using the 4/2 coordinate transforation, the dqaxis inductances were calculated and analyzed detailedly. On this basis, the torques were calculated of different current angle and the calculated results were compared with the data by 3D finite element. Finally the results of variation trend of dqaxis inductance and torque were presented. The research results were helpful to the design and to the method of control of the transverse flux PM machine.
Based on a novel fourphase fluxconcentrating transverse flux PM machine with passive rotor, taking the 3Dfinite element method as a powerful tool, using the 4/2 coordinate transforation, the dqaxis inductances were calculated and analyzed detailedly. On this basis, the torques were calculated of different current angle and the calculated results were compared with the data by 3D finite element. Finally the results of variation trend of dqaxis inductance and torque were presented. The research results were helpful to the design and to the method of control of the transverse flux PM machine.
2017, 44(9):34-38, 43.
Abstract:
A electromagnetic finite element model of permanent magnet synchronous linear motor was presented and distortion rate of the air gap flux density curve was analyzed in detail. By designing the sample space of the parameters, nonlinear regression modeling of the orthogonal experimental design was introduced. Put forward for possible air gap flux density waveform sine electromagnetic scheme. Parameters optimization of the permanent magnet synchronous linear motor was also introduced which was based on chaos search and adaptation function. Simulation results proved that the pole shifting did not affect the motor back electromotive symmetry based on the structural parameters, it provided a novel way for the optimum design of permanent magnet synchronous linear motor and other engineering.
A electromagnetic finite element model of permanent magnet synchronous linear motor was presented and distortion rate of the air gap flux density curve was analyzed in detail. By designing the sample space of the parameters, nonlinear regression modeling of the orthogonal experimental design was introduced. Put forward for possible air gap flux density waveform sine electromagnetic scheme. Parameters optimization of the permanent magnet synchronous linear motor was also introduced which was based on chaos search and adaptation function. Simulation results proved that the pole shifting did not affect the motor back electromotive symmetry based on the structural parameters, it provided a novel way for the optimum design of permanent magnet synchronous linear motor and other engineering.
2017, 44(9):39-43.
Abstract:
In order to meet the needs of high precision drive control system in the field of ultraprecision machining, AC permanent magnet torque motor is developing towards high torque and low ripple, and there is still a big gap between domestic and foreign research. Therefore, according to the actual engineering needs, the structure of large torque, low pulsating AC permanent magnet torque motor was analyzed, and the motor based on the technical requirements was optimized. Finally, the method of finite element analysis was used to analyze the proposed AC permanent magnet torque motor, and verified the design of the motor overload capacity, the performance of cogging torque and the suppression of the ripple torque. The simulation results showed that the designed motor had excellent performance.
In order to meet the needs of high precision drive control system in the field of ultraprecision machining, AC permanent magnet torque motor is developing towards high torque and low ripple, and there is still a big gap between domestic and foreign research. Therefore, according to the actual engineering needs, the structure of large torque, low pulsating AC permanent magnet torque motor was analyzed, and the motor based on the technical requirements was optimized. Finally, the method of finite element analysis was used to analyze the proposed AC permanent magnet torque motor, and verified the design of the motor overload capacity, the performance of cogging torque and the suppression of the ripple torque. The simulation results showed that the designed motor had excellent performance.
2017, 44(9):44-47.
Abstract:
Designed and exploited anewgeneration of YVF315~630 series high voltage varible frequency speed regulation three phase asynchronous motor, with features of energy saving, low vibration, low noise, small shape, light weight, wide spectrum, high power density, energyconservation, environmental protection, etc. The variable frequency speed regulation system, basic data, highefficiency design, insulation structure design, forced ventilation, both insideand outside the wind road design and insulation cover design were introduced, finally compared with the product test data and target data, the analysis showed that the development and design of this series product had achieved the expected goal.
Designed and exploited anewgeneration of YVF315~630 series high voltage varible frequency speed regulation three phase asynchronous motor, with features of energy saving, low vibration, low noise, small shape, light weight, wide spectrum, high power density, energyconservation, environmental protection, etc. The variable frequency speed regulation system, basic data, highefficiency design, insulation structure design, forced ventilation, both insideand outside the wind road design and insulation cover design were introduced, finally compared with the product test data and target data, the analysis showed that the development and design of this series product had achieved the expected goal.
2017, 44(9):48-53.
Abstract:
In order to facilitate the detection of charging equipment field, a portable DC charging detection system of equipment on the site was designed. The system had the function of functional testing, could be convenient for the DC charging equipment test, fully met the direct current charging equipment operation demand detection. The system had the advantages of miniaturization and portability, which was helpful to improve the efficiency of onsite inspection, and ensured the safety and stability of the charging equipment.
In order to facilitate the detection of charging equipment field, a portable DC charging detection system of equipment on the site was designed. The system had the function of functional testing, could be convenient for the DC charging equipment test, fully met the direct current charging equipment operation demand detection. The system had the advantages of miniaturization and portability, which was helpful to improve the efficiency of onsite inspection, and ensured the safety and stability of the charging equipment.
2017, 44(9):54-59, 66.
Abstract:
In order to improve the stability of the movement mechanism, stepper motor driver usually uses current subdivision method, by which a step angle is divided into several small steps. In order to realize the current subdivision drive of the stepper motor, the usual method is use the current loop control system, thereby increasing the current sampling, comparison and other hardware and software modules. The increase in complexity leads to the decrease of the reliability of drive products. In order to improve the reliability of aerospace stepper motor drive control system, a pure openloop drive design based on antifuse FPGA was proposed. By means of the preset duty cycle, the current subdivision of the stepping motor was realized without introducing the current loop. The validity of the design was verified by the prototype test, which could provide reference for the followup aerospace project.
In order to improve the stability of the movement mechanism, stepper motor driver usually uses current subdivision method, by which a step angle is divided into several small steps. In order to realize the current subdivision drive of the stepper motor, the usual method is use the current loop control system, thereby increasing the current sampling, comparison and other hardware and software modules. The increase in complexity leads to the decrease of the reliability of drive products. In order to improve the reliability of aerospace stepper motor drive control system, a pure openloop drive design based on antifuse FPGA was proposed. By means of the preset duty cycle, the current subdivision of the stepping motor was realized without introducing the current loop. The validity of the design was verified by the prototype test, which could provide reference for the followup aerospace project.
2017, 44(9):60-66.
Abstract:
According to the limitation of traditional PI control, a new control strategy to control threephase inverter was proposed, which was formed by proportional complex integral (PCI) control and repetitive control in parallel. Proportional complex integral (PCI) control could eliminate the steadystate error in a given condition; repetitive control could suppress the harmonics of gridconnected current and improved the accuracy of steady state control. The new control strategy could be used to control the AC signal and could be directly applied to the threephase abc coordinate system. Without coordinate change, it could save the cost of the inverter control system. On the basis of MATLAB/Simulink platform, a model of gridconnected inverter with LC filter was established and the results of simulation were analyzed to verify feasibility of the strategy.
According to the limitation of traditional PI control, a new control strategy to control threephase inverter was proposed, which was formed by proportional complex integral (PCI) control and repetitive control in parallel. Proportional complex integral (PCI) control could eliminate the steadystate error in a given condition; repetitive control could suppress the harmonics of gridconnected current and improved the accuracy of steady state control. The new control strategy could be used to control the AC signal and could be directly applied to the threephase abc coordinate system. Without coordinate change, it could save the cost of the inverter control system. On the basis of MATLAB/Simulink platform, a model of gridconnected inverter with LC filter was established and the results of simulation were analyzed to verify feasibility of the strategy.
2017, 44(9):67-70.
Abstract:
LCL type filter has better filter with respect to highfrequency harmonics in the AC current in the inhibition ability, so it is more and more used in the inverter. The switching process in independent mode and grid connected inverter mode between the switch without disturbance was researched. So in the inverter and grid independence under the two modes respectively. On load voltage and grid current direct control. In contrast to the traditional control of voltage and current conditions, the voltage and current control was improved. Through the simulation platform of MATLAB/Simulink, a model of grid connected inverter type LCL filter, simulation analysis proved the feasibility.
LCL type filter has better filter with respect to highfrequency harmonics in the AC current in the inhibition ability, so it is more and more used in the inverter. The switching process in independent mode and grid connected inverter mode between the switch without disturbance was researched. So in the inverter and grid independence under the two modes respectively. On load voltage and grid current direct control. In contrast to the traditional control of voltage and current conditions, the voltage and current control was improved. Through the simulation platform of MATLAB/Simulink, a model of grid connected inverter type LCL filter, simulation analysis proved the feasibility.
2017, 44(9):71-76.
Abstract:
As it had a problem of difficulty to precisely extract the mover position information within the full scope for PMLSM sensorless drive system, and linear motor had the characteristics of wide speed variation range, so a new method of the composite algorithm was proposed. The method was based on the extended Kalman filter (EKF) and closedloop observer position estimation algorithm. When the motor was started and in lowspeed, the extended Kalman filter method was used, but when it was in the high speed, a closedloop observer position was used. When the speed in undertake region, the weighted composite method was used with extended Kalman filtering algorithms and closedloop observer to achieve highprecision position estimation in the system of PMLSM from start to a full range of highspeed. Simulation results showed that the method could estimate the location of the motor accurately in full range of speed.
As it had a problem of difficulty to precisely extract the mover position information within the full scope for PMLSM sensorless drive system, and linear motor had the characteristics of wide speed variation range, so a new method of the composite algorithm was proposed. The method was based on the extended Kalman filter (EKF) and closedloop observer position estimation algorithm. When the motor was started and in lowspeed, the extended Kalman filter method was used, but when it was in the high speed, a closedloop observer position was used. When the speed in undertake region, the weighted composite method was used with extended Kalman filtering algorithms and closedloop observer to achieve highprecision position estimation in the system of PMLSM from start to a full range of highspeed. Simulation results showed that the method could estimate the location of the motor accurately in full range of speed.
2017, 44(9):77-83.
Abstract:
In order to realize the high dynamic performance of induction motor, a passive speed control scheme of induction motor based on fullorder state observer and speed adaptive estimation was proposed for the nonlinear nature of the motor. With the analysis of the passive of induction motor and the relationship between passive and stability, a scheme of asymptotic stability torque tracking controller was designed. In order to solve the problem that the rotor current was difficult to be observed, it was proposed that fullorder state observer was designed based on rotating coordinate and the rotor current and rotor flux were as the state variables. The observer was used to estimate the speed, so that the induction motor without speed sensor passive control could be achieved. The simulation results showed that the method was simple and effective, and the rotor current and speed were accurately estimated by the fullorder observer and effectively improve the dynamic and static performance of the induction motor.
In order to realize the high dynamic performance of induction motor, a passive speed control scheme of induction motor based on fullorder state observer and speed adaptive estimation was proposed for the nonlinear nature of the motor. With the analysis of the passive of induction motor and the relationship between passive and stability, a scheme of asymptotic stability torque tracking controller was designed. In order to solve the problem that the rotor current was difficult to be observed, it was proposed that fullorder state observer was designed based on rotating coordinate and the rotor current and rotor flux were as the state variables. The observer was used to estimate the speed, so that the induction motor without speed sensor passive control could be achieved. The simulation results showed that the method was simple and effective, and the rotor current and speed were accurately estimated by the fullorder observer and effectively improve the dynamic and static performance of the induction motor.
2017, 44(9):84-87.
Abstract:
In order to optimize the position controller PID parameters of higher order nonlinear system, took the five order transfer function as an example, combining with the particle swarm optimization algorithm to achieve the parameter optimization. The PID parameter optimization principle of particle swarm optimization algorithm was designed. On the basis of the transfer function of the known system, the ZN method was used to solve the parameters of the system, Then used the particle swarm optimization algorithm to optimize the initial solution, and compare the dynamic performance of the system before and after the optimization, The results showed that the optimized high order nonlinear system had better dynamic performance, faster response speed, shorter time and better robustness.
In order to optimize the position controller PID parameters of higher order nonlinear system, took the five order transfer function as an example, combining with the particle swarm optimization algorithm to achieve the parameter optimization. The PID parameter optimization principle of particle swarm optimization algorithm was designed. On the basis of the transfer function of the known system, the ZN method was used to solve the parameters of the system, Then used the particle swarm optimization algorithm to optimize the initial solution, and compare the dynamic performance of the system before and after the optimization, The results showed that the optimized high order nonlinear system had better dynamic performance, faster response speed, shorter time and better robustness.
2017, 44(9):88-93, 99.
Abstract:
The conventional induction motor driven system which was equipped with twolevel converter had the problem of large torque ripples. Aiming at it, a torque ripple minimization control for multipole induction motor driven by modular multilevel converter was proposed. The modular multilevel drive converter topology was designed based on the multipole induction motor, and a unipolar carrier phase shifted SVPWM technique was adopted for the controller. Through the analysis and calculation of pulse sequence generation, all low order harmonics achieve four fold frequency of switching frequency, and then minimize the torque ripples. The experimental research had been carried out based on multipole induction motor drive test platform with modular multilevel converter. The test results verified the effectiveness of the new control strategy, and the torque ripple of the motor was improved obviously.
The conventional induction motor driven system which was equipped with twolevel converter had the problem of large torque ripples. Aiming at it, a torque ripple minimization control for multipole induction motor driven by modular multilevel converter was proposed. The modular multilevel drive converter topology was designed based on the multipole induction motor, and a unipolar carrier phase shifted SVPWM technique was adopted for the controller. Through the analysis and calculation of pulse sequence generation, all low order harmonics achieve four fold frequency of switching frequency, and then minimize the torque ripples. The experimental research had been carried out based on multipole induction motor drive test platform with modular multilevel converter. The test results verified the effectiveness of the new control strategy, and the torque ripple of the motor was improved obviously.
2017, 44(9):94-99.
Abstract:
Focusing on the decoupling control performance of the bearingless induction motor (BLIM) inverse system was decreased, which was caused by the parameters variation and varying load. Based on the RFOC inverse system decoupling control strategy, active disturbances rejection control (ADRC) was designed to replace the traditional PID controller. In the control scheme, the cross coupling items and the change of motor parameters and load in bearingless induction motor system were regarded as disturbance. An extended state observer (ESO) was used for estimation, and nonlinear state error feedback (NLSEF) controller was applied to compensate disturbance. The simulation results obtained with ADRC showed that the system had excellent dynamic decoupling performance and strong robustness to the change of motor parameters and load.
Focusing on the decoupling control performance of the bearingless induction motor (BLIM) inverse system was decreased, which was caused by the parameters variation and varying load. Based on the RFOC inverse system decoupling control strategy, active disturbances rejection control (ADRC) was designed to replace the traditional PID controller. In the control scheme, the cross coupling items and the change of motor parameters and load in bearingless induction motor system were regarded as disturbance. An extended state observer (ESO) was used for estimation, and nonlinear state error feedback (NLSEF) controller was applied to compensate disturbance. The simulation results obtained with ADRC showed that the system had excellent dynamic decoupling performance and strong robustness to the change of motor parameters and load.
2017, 44(9):100-104.
Abstract:
Combined with the cold region climate characteristics and the current situation of temperature control in heating room, the relationship between the natural cold source utilization rate and variable frequency energy saving of heat exchanger itself which working fluid was 50% concentration glycol solution was experimentally studied. The results showed that with the parameter of power model, it was feasible for the variable frequency energy saved of heat exchanger itself, under the satisfied conditions of difference in temperature of inside and outside, pump and fan operating frequency, heat exchanger power at the same time. The variable frequency energy saved effect of ethylene glycol heat exchanger was proved in terms of the analysis of climate data, palisade structure heat exchanger and center temperature control test in Harbin.
Combined with the cold region climate characteristics and the current situation of temperature control in heating room, the relationship between the natural cold source utilization rate and variable frequency energy saving of heat exchanger itself which working fluid was 50% concentration glycol solution was experimentally studied. The results showed that with the parameter of power model, it was feasible for the variable frequency energy saved of heat exchanger itself, under the satisfied conditions of difference in temperature of inside and outside, pump and fan operating frequency, heat exchanger power at the same time. The variable frequency energy saved effect of ethylene glycol heat exchanger was proved in terms of the analysis of climate data, palisade structure heat exchanger and center temperature control test in Harbin.
19 Analysis and Detection Method of Common Mode Current in VariableFrequency Speed Regulation System
2017, 44(9):105-109.
Abstract:
The complex waveform common mode current in variable frequency speed regulation system could affect the output accuracy and linearity of classical electromagnetic current sensor, which could result in the measurement error. Aiming at solving this problem, firstly analysis the formation mechanism, flow path and amplitudefrequency characteristics of common mode current, and then a magnetic modulation current sensor with simple structure and wide measurement range was proposed. The detection principle was described in details, and prototype design and experimental verification were conducted. The results indicated that the proposed sensor could measure complex waveform current, which could fulfill the requirements of common mode current detection.
The complex waveform common mode current in variable frequency speed regulation system could affect the output accuracy and linearity of classical electromagnetic current sensor, which could result in the measurement error. Aiming at solving this problem, firstly analysis the formation mechanism, flow path and amplitudefrequency characteristics of common mode current, and then a magnetic modulation current sensor with simple structure and wide measurement range was proposed. The detection principle was described in details, and prototype design and experimental verification were conducted. The results indicated that the proposed sensor could measure complex waveform current, which could fulfill the requirements of common mode current detection.
2017, 44(9):110-117, 124.
Abstract:
A coordinated control strategy of rotor side converter (RSC) and grid side converter (GSC) based on proportionalintegralresonant sliding mode controller (SMC) was presented. First, the control objectives and priority of RSC and GSC were analyzed under different levels of grid faults. Then, the proportionalintegralresonant sliding mode controllers of RSC and GSC were respectively designed to eliminate the tracking error of ac component and improve the dynamic performance and disturbance resisting ability. At last, a simulation was conducted to verify the effectiveness of the designed control scheme under different asymmetrical grid faults.
A coordinated control strategy of rotor side converter (RSC) and grid side converter (GSC) based on proportionalintegralresonant sliding mode controller (SMC) was presented. First, the control objectives and priority of RSC and GSC were analyzed under different levels of grid faults. Then, the proportionalintegralresonant sliding mode controllers of RSC and GSC were respectively designed to eliminate the tracking error of ac component and improve the dynamic performance and disturbance resisting ability. At last, a simulation was conducted to verify the effectiveness of the designed control scheme under different asymmetrical grid faults.
2017, 44(9):118-124.
Abstract:
In order to obtain better frequency regulation and less the cost of active power control of micro power grid with the doubly fed induction generator (DFIG) integrated, an approach of probability weighted sum was proposed for variable load shedding ratio overspeed control, considering the active power of the wind turbine to the micro power grid and providing the reserve capacity to participate in the system frequency modulation. Occurrence probability of wind speed, using probability weighted sum method, considering the cost of shedding load, effect of frequency modulation and cost of frequency modulation recovery for the cost of overspeed control (COC), then obtain the variable load shedding ratio curve. Through the simulation of a micro power grid system with the DFIG integrated, the proposed method was verified to effectively improved the dynamic characteristics of the micro power grid frequency, and reduced the cost of active power control of the wind turbine. It was beneficial to the stable operation of microgrid.
In order to obtain better frequency regulation and less the cost of active power control of micro power grid with the doubly fed induction generator (DFIG) integrated, an approach of probability weighted sum was proposed for variable load shedding ratio overspeed control, considering the active power of the wind turbine to the micro power grid and providing the reserve capacity to participate in the system frequency modulation. Occurrence probability of wind speed, using probability weighted sum method, considering the cost of shedding load, effect of frequency modulation and cost of frequency modulation recovery for the cost of overspeed control (COC), then obtain the variable load shedding ratio curve. Through the simulation of a micro power grid system with the DFIG integrated, the proposed method was verified to effectively improved the dynamic characteristics of the micro power grid frequency, and reduced the cost of active power control of the wind turbine. It was beneficial to the stable operation of microgrid.
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Electric Machines & Control Application ® 2025
Supported by:Beijing E-Tiller Technology Development Co., Ltd.
沪ICP备16038578号-3
Electric Machines & Control Application ® 2025
Supported by:Beijing E-Tiller Technology Development Co., Ltd.
