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Volume 50,Issue 6,2023 Table of Contents
2023, 50(6):1-7.
DOI: 10.12177/emca.2023.059
Abstract:
Aiming at the problem of high-precision control of the angle of attack controlled by dual motors in the lift wing of high-speed train, a new control strategy based on an improved active disturbance rejection controller is proposed. This strategy improves the position loop and feeds the position error in the cross-coupling structure back to the current loop to achieve high-precision control, so as to solve the problems of hysteresis and weak anti-disturbance ability of the high-speed train lift wing system in practice. The fast response ability, anti-disturbance ability and motor synchronization effect of this method are verified by MATLAB/Simulink simulation. The simulation results show that under the condition of different load disturbances, this method can greatly improve the response speed of the system, and its anti-disturbance ability and synchronization effect are excellent, which can help high-speed train lift wing achieve the high-precision angle of attack transformation.
Aiming at the problem of high-precision control of the angle of attack controlled by dual motors in the lift wing of high-speed train, a new control strategy based on an improved active disturbance rejection controller is proposed. This strategy improves the position loop and feeds the position error in the cross-coupling structure back to the current loop to achieve high-precision control, so as to solve the problems of hysteresis and weak anti-disturbance ability of the high-speed train lift wing system in practice. The fast response ability, anti-disturbance ability and motor synchronization effect of this method are verified by MATLAB/Simulink simulation. The simulation results show that under the condition of different load disturbances, this method can greatly improve the response speed of the system, and its anti-disturbance ability and synchronization effect are excellent, which can help high-speed train lift wing achieve the high-precision angle of attack transformation.
2023, 50(6):8-14.
DOI: 10.12177/emca.2023.061
Abstract:
In the high-performance control scheme of the asynchronous motor, in order to reduce the switching loss, the optimized pulse width modulation (PWM) is used to achieve lower current harmonic distortion at low switching frequency. However, the optimized PWM will lead to current and torque shocks when the modulation mode is frequently switched. Therefore, a closed-loop stator flux trajectory tracking control method that shifts optimized pulses online is studied, and a dual observer model consisting of a reduced-order observer based on a self-controlled motor and a motor current model observer is proposed to achieve fundamental component observation. By combining the current harmonic minimum pulse width modulation (CHMPWM) switching angle, the difference between the reference flux and the real flux is reconstructed to achieve stator flux trajectory tracking. A pulse mode switching scheme is proposed when the corrected switching angle is less than 2 under the deadbeat, which eliminates the dynamic modulation error and realizes the high-performance control of the asynchronous motor at low switching frequency. The simulation and experiment on NPC type three-level inverter with switching frequency below 300 Hz prove the effectiveness of the stator flux trajectory tracking control strategy.
In the high-performance control scheme of the asynchronous motor, in order to reduce the switching loss, the optimized pulse width modulation (PWM) is used to achieve lower current harmonic distortion at low switching frequency. However, the optimized PWM will lead to current and torque shocks when the modulation mode is frequently switched. Therefore, a closed-loop stator flux trajectory tracking control method that shifts optimized pulses online is studied, and a dual observer model consisting of a reduced-order observer based on a self-controlled motor and a motor current model observer is proposed to achieve fundamental component observation. By combining the current harmonic minimum pulse width modulation (CHMPWM) switching angle, the difference between the reference flux and the real flux is reconstructed to achieve stator flux trajectory tracking. A pulse mode switching scheme is proposed when the corrected switching angle is less than 2 under the deadbeat, which eliminates the dynamic modulation error and realizes the high-performance control of the asynchronous motor at low switching frequency. The simulation and experiment on NPC type three-level inverter with switching frequency below 300 Hz prove the effectiveness of the stator flux trajectory tracking control strategy.
2023, 50(6):15-20.
DOI: 10.12177/emca.2023.055
Abstract:
Aiming at the low decoding accuracy caused by various errors in the magnetic encoder, a single-layer adaptive neural network is proposed based on the principle of neural network to compensate the errors such as amplitude inequality, phase non-orthogonality, DC bias, harmonic and noise in the sine and cosine signals. The phase-locked loop algorithm is used to decode the compensated sine and cosine signals. In the circuit, the TLE5501 magnetoresistance chip is used to detect the change of angle, the TL082C operational amplifier chip is used to adjust the signal, and the STM32G431 single chip computer is used to verify the performance of the algorithm. The effectiveness and feasibility of the algorithm are verified by simulation and experiment.
Aiming at the low decoding accuracy caused by various errors in the magnetic encoder, a single-layer adaptive neural network is proposed based on the principle of neural network to compensate the errors such as amplitude inequality, phase non-orthogonality, DC bias, harmonic and noise in the sine and cosine signals. The phase-locked loop algorithm is used to decode the compensated sine and cosine signals. In the circuit, the TLE5501 magnetoresistance chip is used to detect the change of angle, the TL082C operational amplifier chip is used to adjust the signal, and the STM32G431 single chip computer is used to verify the performance of the algorithm. The effectiveness and feasibility of the algorithm are verified by simulation and experiment.
2023, 50(6):21-29.
DOI: 10.12177/emca.2023.050
Abstract:
The voltage vector is applied for the whole sampling period in conventional model predictive torque control (MPTC), which causes large stator flux and torque ripple. Therefore, a MPTC system for permanent magnet synchronous motor (PMSM) using fuzzy duty cycle modulation is proposed. The MPTC is used to select the applying voltage vector and fuzzy control is used to determine duty cycle of the voltage vector. The simulation results show that the fuzzy duty cycle modulation MPTC system operates well. Compared with the conventional MPTC, flux and torque deadbeat model predictive control and flux and torque deadbeat control with duty cycle modulation, the MPTC using fuzzy duty cycle modulation can decrease steady-state root mean square error (RMSE) of torque ripple，mean RMSE of flux ripple and total harmonic distortion (THD) of stator current. Due to the decrease of flux and torque ripple, MPTC chooses zero voltage vector more, so the average switching frequency is reduced although duty cycle modulation is used.
The voltage vector is applied for the whole sampling period in conventional model predictive torque control (MPTC), which causes large stator flux and torque ripple. Therefore, a MPTC system for permanent magnet synchronous motor (PMSM) using fuzzy duty cycle modulation is proposed. The MPTC is used to select the applying voltage vector and fuzzy control is used to determine duty cycle of the voltage vector. The simulation results show that the fuzzy duty cycle modulation MPTC system operates well. Compared with the conventional MPTC, flux and torque deadbeat model predictive control and flux and torque deadbeat control with duty cycle modulation, the MPTC using fuzzy duty cycle modulation can decrease steady-state root mean square error (RMSE) of torque ripple，mean RMSE of flux ripple and total harmonic distortion (THD) of stator current. Due to the decrease of flux and torque ripple, MPTC chooses zero voltage vector more, so the average switching frequency is reduced although duty cycle modulation is used.
2023, 50(6):30-36.
DOI: 10.12177/emca.2023.065
Abstract:
As a widely used motor rotor position measuring device, the measuring accuracy of the magnetic encoder has an important impact on the performance of the entire control system. In order to improve the measuring accuracy of rotor position, the dual second-order generalized integrator with phase-locked loop (DSOGI-PLL) decoding algorithm is used to extract the positive sequence components of the output signals of the magnetic encoder, and restrain the amplitude error and phase error in the output signals of the magnetic encoder. Aiming at the defect that the conventional second-order generalized integrator (SOGI) cannot suppress the DC offset error, the improved second-order generalized integrator (ISOGI) is proposed to eliminate the DC offset error and improve the decoding accuracy of the magnetic encoder. The simulation and experiment results verify the effectiveness of the proposed method.
As a widely used motor rotor position measuring device, the measuring accuracy of the magnetic encoder has an important impact on the performance of the entire control system. In order to improve the measuring accuracy of rotor position, the dual second-order generalized integrator with phase-locked loop (DSOGI-PLL) decoding algorithm is used to extract the positive sequence components of the output signals of the magnetic encoder, and restrain the amplitude error and phase error in the output signals of the magnetic encoder. Aiming at the defect that the conventional second-order generalized integrator (SOGI) cannot suppress the DC offset error, the improved second-order generalized integrator (ISOGI) is proposed to eliminate the DC offset error and improve the decoding accuracy of the magnetic encoder. The simulation and experiment results verify the effectiveness of the proposed method.
2023, 50(6):37-42.
DOI: 10.12177/emca.2023.063
Abstract:
Axial flow pump motor is a type of permanent magnet micromotor, which has small volume, high flow rate and good stability. It is more widely used in artificial heart. The winding of general brushless DC motor often adopts star connection method, while the winding of axial flow pump motor is usually designed as coreless winding, so its winding generally adopts triangular connection method. When the sensorless control is applied to the axial flow pump motor, the traditional back EMF zero crossing detection method used for star connection method is no longer applicable. Therefore, a new back EMF zero crossing detection method is proposed to realize the sensorless control of the axial flow pump motor. The experimental results show that this method is suitable for the axial flow pump motor with triangular connection.
Axial flow pump motor is a type of permanent magnet micromotor, which has small volume, high flow rate and good stability. It is more widely used in artificial heart. The winding of general brushless DC motor often adopts star connection method, while the winding of axial flow pump motor is usually designed as coreless winding, so its winding generally adopts triangular connection method. When the sensorless control is applied to the axial flow pump motor, the traditional back EMF zero crossing detection method used for star connection method is no longer applicable. Therefore, a new back EMF zero crossing detection method is proposed to realize the sensorless control of the axial flow pump motor. The experimental results show that this method is suitable for the axial flow pump motor with triangular connection.
2023, 50(6):43-51.
DOI: 10.12177/emca.2023.057
Abstract:
Electro-excited three-phase brushless hidden pole synchronous generator can change the air-gap magnetic field strength by changing the magnitude of excitation winding current, thus realizing wide-range voltage regulation. Rotor winding is an important part of three-phase brushless hidden pole synchronous generator, which generally uses concentric winding. After the rotor winding with a parallel branch number of one is connected between pole and pole and between coil and coil in same pole, the positive end and negative end of the lead line are fixed on the end face of the iron core and directly led out. The rotor winding with a parallel branch number more than one not only needs to be connected between pole and pole and between coil and coil in same pole, but also needs to select the appropriate parallel connection methods. Different connection methods directly affect the complexity and reliability of the rotor winding. Taking a 10 pole and 5 MW three-phase brushless hidden pole synchronous generator as an example, the different connection methods of rotor winding with two parallel branches are compared. Combining the manufacturability and operability, the optimal connection method of rotor winding is selected, and the generator rotor winding and prototype are manufactured. The results show that this connection method is simple and reliable, which can improve the product manufacturability and effectively avoid the insulation faults of rotor winding.
Electro-excited three-phase brushless hidden pole synchronous generator can change the air-gap magnetic field strength by changing the magnitude of excitation winding current, thus realizing wide-range voltage regulation. Rotor winding is an important part of three-phase brushless hidden pole synchronous generator, which generally uses concentric winding. After the rotor winding with a parallel branch number of one is connected between pole and pole and between coil and coil in same pole, the positive end and negative end of the lead line are fixed on the end face of the iron core and directly led out. The rotor winding with a parallel branch number more than one not only needs to be connected between pole and pole and between coil and coil in same pole, but also needs to select the appropriate parallel connection methods. Different connection methods directly affect the complexity and reliability of the rotor winding. Taking a 10 pole and 5 MW three-phase brushless hidden pole synchronous generator as an example, the different connection methods of rotor winding with two parallel branches are compared. Combining the manufacturability and operability, the optimal connection method of rotor winding is selected, and the generator rotor winding and prototype are manufactured. The results show that this connection method is simple and reliable, which can improve the product manufacturability and effectively avoid the insulation faults of rotor winding.
HAN Shiqi
,
AN Hui
,
LU Yanjun
,
HU Yuyong
,
SHANG Huaying
,
DENG Wenyu
,
WEI Lai
,
QI Lijun
,
AN Yuejun
2023, 50(6):52-58.
DOI: 10.12177/emca.2023.053
Abstract:
The permanent magnet synchronous motor (PMSM) for electric vehicle drive has the characteristics of high power density, light weight, small size and compact internal mechanism. Therefore, the internal heat dissipation pressure of the motor is high, if the heat is not dispersed effectively in time, it will cause a serious temperature rise problem and limit the power of the motor. Aiming at the serious heat problem at the PMSM winding end, the cooling effect and fluid movement are analyzed under different nozzles, different flow rates and different spray positions by using spray cooling method and discretizing the cooling medium. After selecting a reasonable spray form and a spray flow rate, the temperature fields of the winding end of the spray cooling and water cooling motor are compared. The analysis results prove the effectiveness of spray cooling and provide a reference for the future research on spray cooling of electric vehicle drive motor.
The permanent magnet synchronous motor (PMSM) for electric vehicle drive has the characteristics of high power density, light weight, small size and compact internal mechanism. Therefore, the internal heat dissipation pressure of the motor is high, if the heat is not dispersed effectively in time, it will cause a serious temperature rise problem and limit the power of the motor. Aiming at the serious heat problem at the PMSM winding end, the cooling effect and fluid movement are analyzed under different nozzles, different flow rates and different spray positions by using spray cooling method and discretizing the cooling medium. After selecting a reasonable spray form and a spray flow rate, the temperature fields of the winding end of the spray cooling and water cooling motor are compared. The analysis results prove the effectiveness of spray cooling and provide a reference for the future research on spray cooling of electric vehicle drive motor.
2023, 50(6):59-65.
DOI: 10.12177/emca.2023.062
Abstract:
Aiming at the problem that the motor for vacuum dry pump drive is seriously heated when working in extreme vacuum environment, a 4.5 kW flux switching permanent magnet synchronous motor (FSPMSM) is taken as the research object to analyze its cooling structure, and the temperature field simulation calculation is carried out. The three-dimensional temperature field simulation calculation model of the FSPMSM is established by finite element software. The boundary conditions and heat source excitation are set to obtain the temperature distribution of each component inside the motor. The influence of the diameter of the water channel section and the number of water channel turns on the temperature change of the motor is analyzed. The temperature field comparison analysis with a permanent magnet synchronous motor (PMSM) with the same technical requirements under the same cooling conditions shows that the motor design is reasonable. Compared with the traditional PMSM commonly used in vacuum dry pump, this motor can better reduce the loss and reduce the temperature rise, which provides a certain reference for the development of new products of FSPMSM for vacuum dry pump.
Aiming at the problem that the motor for vacuum dry pump drive is seriously heated when working in extreme vacuum environment, a 4.5 kW flux switching permanent magnet synchronous motor (FSPMSM) is taken as the research object to analyze its cooling structure, and the temperature field simulation calculation is carried out. The three-dimensional temperature field simulation calculation model of the FSPMSM is established by finite element software. The boundary conditions and heat source excitation are set to obtain the temperature distribution of each component inside the motor. The influence of the diameter of the water channel section and the number of water channel turns on the temperature change of the motor is analyzed. The temperature field comparison analysis with a permanent magnet synchronous motor (PMSM) with the same technical requirements under the same cooling conditions shows that the motor design is reasonable. Compared with the traditional PMSM commonly used in vacuum dry pump, this motor can better reduce the loss and reduce the temperature rise, which provides a certain reference for the development of new products of FSPMSM for vacuum dry pump.
LI Jinlong
,
AN Hui
,
LU Yanjun
,
HU Yuyong
,
DENG Wenyu
,
WEI Lai
,
SHANG Huaying
,
QI Lijun
,
AN Yuejun
2023, 50(6):66-70.
DOI: 10.12177/emca.2023.054
Abstract:
The heat dissipation of the vacuum dry pump drive motor is difficult, and it is necessary to strictly control its temperature rise to ensure the long-term operation of the system. Taking a 30 kW drive motor as the research object, an asynchronous motor and an 18/12 pole double salient permanent magnet motor are designed. The external dimensions and power levels of the two motors are the same. At the same time, the cooling mode of the two motors is water cooling with spiral water channel in the casing, and the temperature fields of the two motors are analyzed respectively. The analysis results show that the doubly salient permanent magnet motor has a lower overall temperature rise during the rated operation, which is more suitable for the vacuum dry pump units.
The heat dissipation of the vacuum dry pump drive motor is difficult, and it is necessary to strictly control its temperature rise to ensure the long-term operation of the system. Taking a 30 kW drive motor as the research object, an asynchronous motor and an 18/12 pole double salient permanent magnet motor are designed. The external dimensions and power levels of the two motors are the same. At the same time, the cooling mode of the two motors is water cooling with spiral water channel in the casing, and the temperature fields of the two motors are analyzed respectively. The analysis results show that the doubly salient permanent magnet motor has a lower overall temperature rise during the rated operation, which is more suitable for the vacuum dry pump units.
2023, 50(6):71-77.
DOI: 10.12177/emca.2023.058
Abstract:
Aiming at the problem of frequency oscillation caused by the output fluctuation and load variation of renewable energy in the microgrid, a load frequency controller with hybrid H2/H∞ robust control strategy is proposed. Firstly, a load frequency control model of wind-photovoltaic-diesel microgrid with power disturbance signal is established. Then a robust H2/H∞ controller is designed based on robust H∞ theory. In the design of the controller, the salp swarm algorithm (SSA) is used to optimize the relevant weighting matrix parameters and norm weights to achieve the best adjustment performance of the controller. Finally, the simulation results show that compared with the traditional robust H∞ control and PID control, the proposed H2/H∞ robust controller has better control performance under the external power disturbance of the microgrid and the parameter disturbance of the system.
Aiming at the problem of frequency oscillation caused by the output fluctuation and load variation of renewable energy in the microgrid, a load frequency controller with hybrid H2/H∞ robust control strategy is proposed. Firstly, a load frequency control model of wind-photovoltaic-diesel microgrid with power disturbance signal is established. Then a robust H2/H∞ controller is designed based on robust H∞ theory. In the design of the controller, the salp swarm algorithm (SSA) is used to optimize the relevant weighting matrix parameters and norm weights to achieve the best adjustment performance of the controller. Finally, the simulation results show that compared with the traditional robust H∞ control and PID control, the proposed H2/H∞ robust controller has better control performance under the external power disturbance of the microgrid and the parameter disturbance of the system.
2023, 50(6):78-87.
DOI: 10.12177/emca.2023.051
Abstract:
AC-DC-AC traction substation can realize the comprehensive treatment of power quality of electrified railway and has the ability of continuous power supply. However, the traditional AC-DC-AC traction substation scheme is difficult to transform based on the existing traction substation, and has weak adaptability and poor fault tolerance performance under the fault conditions. To solve these problems, a scheme of AC-DC-AC traction substation with strong adaptability and high fault tolerance is proposed. The scheme retains the main circuit form of the traditional traction substation, and it connects a set of rectifiers to the secondary windings of the three-phase-two-phase traction transformer respectively, and the DC-links is connected in parallel to form the common DC bus. The DC input of the inverter is connected to the common DC bus and the output is connected to the traction network, which solves the problems of power quality and phase separation. Compared with the existing AC-DC-AC traction substation scheme, the proposed scheme is of little difficulty, strong adaptability and high reliability. The simulation model is established in MATLAB/Simulink and the simulation analysis is carried out, which verifies the feasibility and correctness of the scheme.
AC-DC-AC traction substation can realize the comprehensive treatment of power quality of electrified railway and has the ability of continuous power supply. However, the traditional AC-DC-AC traction substation scheme is difficult to transform based on the existing traction substation, and has weak adaptability and poor fault tolerance performance under the fault conditions. To solve these problems, a scheme of AC-DC-AC traction substation with strong adaptability and high fault tolerance is proposed. The scheme retains the main circuit form of the traditional traction substation, and it connects a set of rectifiers to the secondary windings of the three-phase-two-phase traction transformer respectively, and the DC-links is connected in parallel to form the common DC bus. The DC input of the inverter is connected to the common DC bus and the output is connected to the traction network, which solves the problems of power quality and phase separation. Compared with the existing AC-DC-AC traction substation scheme, the proposed scheme is of little difficulty, strong adaptability and high reliability. The simulation model is established in MATLAB/Simulink and the simulation analysis is carried out, which verifies the feasibility and correctness of the scheme.
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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.
