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Volume 48,Issue 8,2021 Table of Contents
2021, 48(8):1-7.
DOI: 10.12177/emca.2021.057
Abstract:
The constant power speed regulation interval of the traditional induction motor (IM) is limited, the outside rated point efficiency is reduced, and the use of the traditional motor is constrained by the use scene. In order to broaden the speed regulation and highefficiency working range and adapt to the operation requirements of various environments, a stator squirrel cage twelvephase IM is used to replace the traditional distributed winding three-phase IM. Through the rotor fieldoriented vector control, the harmonic currents of different planes are decoupled to drive the motor to rotate, the harmonic currents of all planes are regulated through the control function, which can easily and quickly switch the number of pole pairs of the motor. The proposed method of the controlling the vector decoupling plane of the control function to achieve pole pair switching is simulated and verified. The simulation results show that the proposed pole pair switching technology can realize the pole pair switching of twelvephase IM at different speeds. The speed adjustment range is widened to meet the highefficiency operation under different working conditions.
The constant power speed regulation interval of the traditional induction motor (IM) is limited, the outside rated point efficiency is reduced, and the use of the traditional motor is constrained by the use scene. In order to broaden the speed regulation and highefficiency working range and adapt to the operation requirements of various environments, a stator squirrel cage twelvephase IM is used to replace the traditional distributed winding three-phase IM. Through the rotor fieldoriented vector control, the harmonic currents of different planes are decoupled to drive the motor to rotate, the harmonic currents of all planes are regulated through the control function, which can easily and quickly switch the number of pole pairs of the motor. The proposed method of the controlling the vector decoupling plane of the control function to achieve pole pair switching is simulated and verified. The simulation results show that the proposed pole pair switching technology can realize the pole pair switching of twelvephase IM at different speeds. The speed adjustment range is widened to meet the highefficiency operation under different working conditions.
2021, 48(8):8-15，43.
DOI: 10.12177/emca.2021.064
Abstract:
In view of the nonlinear characteristics of aircraft variable frequency AC digital voltage regulator system, the fuzzy control is combined with PID control to design the control algorithm of digital voltage regulator and construct a multi closed loop feedback control strategy. The design method and modeling process of fuzzy PID controller are introduced, and then the simulation model of fuzzy PID control is built in Simulink. The voltage regulation performance of the proposed control and the traditional PID control are compared under different operation conditions. The results show that the dynamic and steady-state performances of the regulator under fuzzy PID control are better than those of the traditional PID control. Finally, the experimental verification based on dual DSP hardware platform is carried out, and it is cross-linked with the typical electrical load of a type of aircraft. The experimental results prove the correctness and effectiveness of the designed controller.
In view of the nonlinear characteristics of aircraft variable frequency AC digital voltage regulator system, the fuzzy control is combined with PID control to design the control algorithm of digital voltage regulator and construct a multi closed loop feedback control strategy. The design method and modeling process of fuzzy PID controller are introduced, and then the simulation model of fuzzy PID control is built in Simulink. The voltage regulation performance of the proposed control and the traditional PID control are compared under different operation conditions. The results show that the dynamic and steady-state performances of the regulator under fuzzy PID control are better than those of the traditional PID control. Finally, the experimental verification based on dual DSP hardware platform is carried out, and it is cross-linked with the typical electrical load of a type of aircraft. The experimental results prove the correctness and effectiveness of the designed controller.
2021, 48(8):16-21.
DOI: 10.12177/emca.2021.052
Abstract:
In view of the inaccurate commutation of brushless DC motors in highspeed state, a novel method of sensorless control is proposed based on the special relationship between the motor back electromotive force (EMF) and the commutation points. The novel method can calculate the commutation point accurately. The uncertainty of the phase delay estimation process in traditional algorithm is avoided, and the dynamic response performance of the sensorless control algorithm is improved. A look\|up table method is introduced to execute the algorithm, and the implementation of the algorithm is simplified. A new type of motor phase voltage detection circuit is involved, which simplifies the external circuit of the sensorless control algorithm, and makes the implementation cost of sensorless control algorithm further decreased. Experimental results show that the circuit can effectively detect the phase voltage of the motor. The proposed algorithm is simple to implement and has great advantages in dynamic response.
In view of the inaccurate commutation of brushless DC motors in highspeed state, a novel method of sensorless control is proposed based on the special relationship between the motor back electromotive force (EMF) and the commutation points. The novel method can calculate the commutation point accurately. The uncertainty of the phase delay estimation process in traditional algorithm is avoided, and the dynamic response performance of the sensorless control algorithm is improved. A look\|up table method is introduced to execute the algorithm, and the implementation of the algorithm is simplified. A new type of motor phase voltage detection circuit is involved, which simplifies the external circuit of the sensorless control algorithm, and makes the implementation cost of sensorless control algorithm further decreased. Experimental results show that the circuit can effectively detect the phase voltage of the motor. The proposed algorithm is simple to implement and has great advantages in dynamic response.
4 Position Sliding Mode Control of Linear Servo System with Improved Variable Exponential Reaching Law
2021, 48(8):22-27.
DOI: 10.12177/emca.2021.062
Abstract:
Permanent magnet synchronous linear motor (PMSLM) drives the load directly, and the motor performance is easily affected by internal and external disturbances, which makes the control performance poor. Sliding mode control (SMC) is a kind of discontinuous control with good robustness, but the chattering problem exists in traditional sliding mode. Aiming at this problem, an improved SMC is designed. Based on the exponential reaching law, the variable exponential integral power term, the power reaching law and the saturation function of state variables are introduced to realize the position SMC of PMSLM, and the chattering caused by the sliding mode is effectively reduced. The extended state observer (ESO) is used to observe the external load disturbance in real time, and the reaching law parameter in the sliding mode variable structure is reduced by adjusting the control quantity, so as to improve the control performance of the motor.
Permanent magnet synchronous linear motor (PMSLM) drives the load directly, and the motor performance is easily affected by internal and external disturbances, which makes the control performance poor. Sliding mode control (SMC) is a kind of discontinuous control with good robustness, but the chattering problem exists in traditional sliding mode. Aiming at this problem, an improved SMC is designed. Based on the exponential reaching law, the variable exponential integral power term, the power reaching law and the saturation function of state variables are introduced to realize the position SMC of PMSLM, and the chattering caused by the sliding mode is effectively reduced. The extended state observer (ESO) is used to observe the external load disturbance in real time, and the reaching law parameter in the sliding mode variable structure is reduced by adjusting the control quantity, so as to improve the control performance of the motor.
2021, 48(8):28-35，43.
DOI: 10.12177/emca.2021.058
Abstract:
The bidirectional quasi-Z-source inverter (qZSI) driven by permanent magnet synchronous motor (PMSM) not only has the advantages of both the Z-source inverter and the PMSM, but also realizes the bidirectional flow of energy. According to the characteristics of the system, a fast vector selection finite control set-model predictive current control (FCS-MPCC) strategy is proposed. The reference value of inductance current is generated by controlling the DC link voltage of quasi-Z-source network with the electromagnetic power feedforward value of PMSM. The reference motor current is generated by the speed closed-loop control. By predicting the inductor current value and calculating the inductor current subcost function in the shoot-through (ST) case and non-shoot-through (NST) case, either the ST case or NST case is chosen to realize the control of DC link voltage. In the NST case, combined with the space voltage vector pulse width modulation strategy, only the four vectors of the sector where the target voltage vector is located participate in the PMSM stator current prediction and cost function calculation to select the optimal switching state. It can reduce the amount of online calculation while controlling the speed of the PMSM. The simulation results show that the proposed control strategy can realize the boost control of the bidirectional qZSI and the speed control of the PMSM under traction or braking conditions, and the system has good steadystate and dynamic performance.
The bidirectional quasi-Z-source inverter (qZSI) driven by permanent magnet synchronous motor (PMSM) not only has the advantages of both the Z-source inverter and the PMSM, but also realizes the bidirectional flow of energy. According to the characteristics of the system, a fast vector selection finite control set-model predictive current control (FCS-MPCC) strategy is proposed. The reference value of inductance current is generated by controlling the DC link voltage of quasi-Z-source network with the electromagnetic power feedforward value of PMSM. The reference motor current is generated by the speed closed-loop control. By predicting the inductor current value and calculating the inductor current subcost function in the shoot-through (ST) case and non-shoot-through (NST) case, either the ST case or NST case is chosen to realize the control of DC link voltage. In the NST case, combined with the space voltage vector pulse width modulation strategy, only the four vectors of the sector where the target voltage vector is located participate in the PMSM stator current prediction and cost function calculation to select the optimal switching state. It can reduce the amount of online calculation while controlling the speed of the PMSM. The simulation results show that the proposed control strategy can realize the boost control of the bidirectional qZSI and the speed control of the PMSM under traction or braking conditions, and the system has good steadystate and dynamic performance.
2021, 48(8):36-43.
DOI: 10.12177/emca.2021.068
Abstract:
During the operation, the change of moment of inertia has a negative influence on permanent magnet synchronous motor (PMSM) servo system. Therefore, the quantitative feedback theory (QFT) is used to design PID controller. The moment of inertia is regarded as the parameter variation, and the uncertainty model of the controlled plant is obtained. Then the expected performance index is set. The PID controller is synthesized on Nichols diagram by QFT. Simulation and experimental results show that the proposed method can effectively improve the influence of moment of inertia change of PMSM servo system and enhance the robustness of the system. Finally, the comparison with PI controller shows its superiority.
During the operation, the change of moment of inertia has a negative influence on permanent magnet synchronous motor (PMSM) servo system. Therefore, the quantitative feedback theory (QFT) is used to design PID controller. The moment of inertia is regarded as the parameter variation, and the uncertainty model of the controlled plant is obtained. Then the expected performance index is set. The PID controller is synthesized on Nichols diagram by QFT. Simulation and experimental results show that the proposed method can effectively improve the influence of moment of inertia change of PMSM servo system and enhance the robustness of the system. Finally, the comparison with PI controller shows its superiority.
2021, 48(8):44-49，71.
DOI: 10.12177/emca.2021.066
Abstract:
In order to meet the requirements of the latest national standard of motor energy efficiency grade and improve the operation efficiency of the motor, a 55 kW wet submersible motor is taken as an example, and a rotor electromagnetic scheme design method of permanent magnet assisted synchronous reluctance motor (PMASRM) is proposed. Combined with rotor remanufacturing technology, the rotor of traditional submersible induction motor is replaced and transformed into submersible PMASRM. The designed submersible PMASRM has the same stator core structure and winding form as the traditional submersible induction motor, which improves the utilization rate of materials and reduces the manufacturing cost. The finite element method results show that the efficiency of the modified submersible PMASRM is improved effectively compared with the submersible induction motor.
In order to meet the requirements of the latest national standard of motor energy efficiency grade and improve the operation efficiency of the motor, a 55 kW wet submersible motor is taken as an example, and a rotor electromagnetic scheme design method of permanent magnet assisted synchronous reluctance motor (PMASRM) is proposed. Combined with rotor remanufacturing technology, the rotor of traditional submersible induction motor is replaced and transformed into submersible PMASRM. The designed submersible PMASRM has the same stator core structure and winding form as the traditional submersible induction motor, which improves the utilization rate of materials and reduces the manufacturing cost. The finite element method results show that the efficiency of the modified submersible PMASRM is improved effectively compared with the submersible induction motor.
2021, 48(8):50-54.
DOI: 10.12177/emca.2021.044
Abstract:
To solve the problem of cogging torque of the flux-switching machine for electric bicycles, two machines with 12 slots/10 poles and 12 slots/11 poles are designed and compared based on the slot-pole matching principle. The torque ripple of the 12-slot/11-pole machine is only 16.6% of that of the 12-slot/10-pole machine. The cogging torque is further reduced by the rotor segmented skew pole method. The influence of the rotor skewed pole angle on the torque performance is analyzed. The simulation results show that the torque ripple of the 12-slot/11-pole flux-switching machine with the optimization of the skewed pole is only 2%, and the output torque can meet the daily driving power demand of the electric bicycle.
To solve the problem of cogging torque of the flux-switching machine for electric bicycles, two machines with 12 slots/10 poles and 12 slots/11 poles are designed and compared based on the slot-pole matching principle. The torque ripple of the 12-slot/11-pole machine is only 16.6% of that of the 12-slot/10-pole machine. The cogging torque is further reduced by the rotor segmented skew pole method. The influence of the rotor skewed pole angle on the torque performance is analyzed. The simulation results show that the torque ripple of the 12-slot/11-pole flux-switching machine with the optimization of the skewed pole is only 2%, and the output torque can meet the daily driving power demand of the electric bicycle.
2021, 48(8):55-62.
DOI: 10.12177/emca.2020.061
Abstract:
Three-phase voltage unbalance in distribution network will have a greater impact on the loss of asynchronous motors. Using equivalent circuit formula to calculate motor loss under the influence of three-phase voltage unbalance has the problems of unstable accuracy, too many parameters and too complex mathematical model. In response to the above problem, an asynchronous motor loss assessment method based on the attention mechanism and convolutional neural network (CNN), namely Attention-CNN is proposed. This method takes the measured motor data as input, and introduces the attention mechanism to assign different weights to motor features. The CNN framework composed of the convolutional layer and the full connection layer is used to learn the measured data of the asynchronous motor, thus completing motor loss assessment. Taking the asynchronous motor loss data obtained from field experimentation as a practical example, the average error between the assessed loss of this method and the measured loss is only 0.717% and 0.549%. Comparing with the equivalent circuit and other typical machine learning algorithms, the proposed method has better performance in loss assessment showed in experimental results.
Three-phase voltage unbalance in distribution network will have a greater impact on the loss of asynchronous motors. Using equivalent circuit formula to calculate motor loss under the influence of three-phase voltage unbalance has the problems of unstable accuracy, too many parameters and too complex mathematical model. In response to the above problem, an asynchronous motor loss assessment method based on the attention mechanism and convolutional neural network (CNN), namely Attention-CNN is proposed. This method takes the measured motor data as input, and introduces the attention mechanism to assign different weights to motor features. The CNN framework composed of the convolutional layer and the full connection layer is used to learn the measured data of the asynchronous motor, thus completing motor loss assessment. Taking the asynchronous motor loss data obtained from field experimentation as a practical example, the average error between the assessed loss of this method and the measured loss is only 0.717% and 0.549%. Comparing with the equivalent circuit and other typical machine learning algorithms, the proposed method has better performance in loss assessment showed in experimental results.
2021, 48(8):63-66，89.
DOI: 10.12177/emca.2021.069
Abstract:
Taking a self-fan-cooling traction motor as an example, the wind resistance, air volume, flow rate, mechanical loss and aerodynamic noise of the motor ventilation system are analyzed by using computational fluid dynamics (CFD) method, and the experimental verification is carried out. The results show that improving the uniformity and stability of the air flow in the fan and reducing the fan vortex can significantly improve the fan performance and reduce the fan loss. After optimization, the aerodynamic noise of the motor is obviously reduced and the efficiency of the motor is significantly improved, improving the performance of the motor. The calculation and analysis method and the conclusion have certain reference significance for the improvement of motor fan performance.
Taking a self-fan-cooling traction motor as an example, the wind resistance, air volume, flow rate, mechanical loss and aerodynamic noise of the motor ventilation system are analyzed by using computational fluid dynamics (CFD) method, and the experimental verification is carried out. The results show that improving the uniformity and stability of the air flow in the fan and reducing the fan vortex can significantly improve the fan performance and reduce the fan loss. After optimization, the aerodynamic noise of the motor is obviously reduced and the efficiency of the motor is significantly improved, improving the performance of the motor. The calculation and analysis method and the conclusion have certain reference significance for the improvement of motor fan performance.
2021, 48(8):67-71.
DOI: 10.12177/emca.2021.056
Abstract:
The design of a high voltage and high speed open three-phase asynchronous motor for refrigerators is briefly introduced. The product focuses on the breakthrough of high efficiency, energy saving, high power density, compact structure, low vibration, low noise and other motor design difficulties. The main performance parameters of the motor (efficiency, power factor, starting current, temperature rise, noise, vibration, etc.) are comprehensively considered. Electromagnetic and insulation designs are optimized by using thinned insulation measures and introducing trapezoidal coil design.On the premise of the reliability of the product, improvement of the structural design is realized by optimizing the wind path and reducing the mechanical consumption and noise.The test data of the product verify the technological advancement.
The design of a high voltage and high speed open three-phase asynchronous motor for refrigerators is briefly introduced. The product focuses on the breakthrough of high efficiency, energy saving, high power density, compact structure, low vibration, low noise and other motor design difficulties. The main performance parameters of the motor (efficiency, power factor, starting current, temperature rise, noise, vibration, etc.) are comprehensively considered. Electromagnetic and insulation designs are optimized by using thinned insulation measures and introducing trapezoidal coil design.On the premise of the reliability of the product, improvement of the structural design is realized by optimizing the wind path and reducing the mechanical consumption and noise.The test data of the product verify the technological advancement.
2021, 48(8):72-80，89.
DOI: 10.12177/emca.2021.065
Abstract:
In order to improve the lateral tracking control performance of low speed autonomous vehicle under different conditions, a joint controller based on pure pursuit (PP) control and model predictive control (MPC) is designed. When the deviation of position and direction are large, it is switched to PP control. When the deviation of position and direction are small and the MPC constraint is satisfied, it is switched to MPC. At the same time, a mode switching controller is designed to ensure smooth switching between the two kinds of control systems. The simulation analysis and real vehicle test are carried out for the joint controller. The test results show that, compared with MPC, the speediness and stability of the tracking of the joint controller are optimized obviously and compared with PP control, the accuracy of the tracking is also improved obviously. The addition of mode switching controller improves the robustness of the switching process.
In order to improve the lateral tracking control performance of low speed autonomous vehicle under different conditions, a joint controller based on pure pursuit (PP) control and model predictive control (MPC) is designed. When the deviation of position and direction are large, it is switched to PP control. When the deviation of position and direction are small and the MPC constraint is satisfied, it is switched to MPC. At the same time, a mode switching controller is designed to ensure smooth switching between the two kinds of control systems. The simulation analysis and real vehicle test are carried out for the joint controller. The test results show that, compared with MPC, the speediness and stability of the tracking of the joint controller are optimized obviously and compared with PP control, the accuracy of the tracking is also improved obviously. The addition of mode switching controller improves the robustness of the switching process.
2021, 48(8):81-89.
DOI: 10.12177/emca.2021.060
Abstract:
The relationship between circulating current and capacitor voltage unbalance is studied when single-phase NPC H-bridge cascaded inverters are connected in parallel. Through the equivalent circuit of circulating current, the mathematical relationship between the circulating current and the unbalanced capacitor voltage in a switching cycle is derived, and it is found that the difference of the unbalanced capacitor voltage is one of the excitation sources of the circulating current. Meanwhile, the circulating current will improve the capacitor voltage balance of a parallel inverter and worsen the capacitor voltage balance of another inverter. In order to establish a mathematical model of circulating current-capacitor voltage unbalance under periodic steady-state conditions, a modelling idea of “hypothesis-modeling-solving-checking-correction” is proposed to establish a circulation effect model based on blockage, which effectively avoids multiple factors. The complexity of modelling also improves the accuracy of the model. Simulation and experimental results show that the coefficient of determination for the fitting of the block-based circulation model can reach 0.963 8 and 0.945 0, which proves the accuracy of the circulation model.
The relationship between circulating current and capacitor voltage unbalance is studied when single-phase NPC H-bridge cascaded inverters are connected in parallel. Through the equivalent circuit of circulating current, the mathematical relationship between the circulating current and the unbalanced capacitor voltage in a switching cycle is derived, and it is found that the difference of the unbalanced capacitor voltage is one of the excitation sources of the circulating current. Meanwhile, the circulating current will improve the capacitor voltage balance of a parallel inverter and worsen the capacitor voltage balance of another inverter. In order to establish a mathematical model of circulating current-capacitor voltage unbalance under periodic steady-state conditions, a modelling idea of “hypothesis-modeling-solving-checking-correction” is proposed to establish a circulation effect model based on blockage, which effectively avoids multiple factors. The complexity of modelling also improves the accuracy of the model. Simulation and experimental results show that the coefficient of determination for the fitting of the block-based circulation model can reach 0.963 8 and 0.945 0, which proves the accuracy of the circulation model.
2021, 48(8):90-97，105.
DOI: 10.12177/emca.2021.067
Abstract:
With the rapid development of wind power generation, wind generator has become an important part of the generator sets. The reliability of the generator insulation system is of great significance to improving the reliability of the entire wind generator set. Compared with ordinary generators, wind generators introduce converter and the insulation system bears different stresses such as high-frequency pulse voltage and partial discharge. 〖JP2〗At the same time, the operating environment of wind generators is more complicated, so that the insulation system is affected by factors including high humidity, high temperature difference, heavy salt spray, etc. during long-term operation. In response to actual operating requirements, the reliability evaluation methods of wind generator insulation systems are introduced from different dimensions, including longterm heat resistance, electrical stress durability and environmental reliability. Various methods are analyzed, so that the complete machine manufacturer can choose the appropriate evaluation method according to the actual demand and improve the reliability of the wind generator products.
With the rapid development of wind power generation, wind generator has become an important part of the generator sets. The reliability of the generator insulation system is of great significance to improving the reliability of the entire wind generator set. Compared with ordinary generators, wind generators introduce converter and the insulation system bears different stresses such as high-frequency pulse voltage and partial discharge. 〖JP2〗At the same time, the operating environment of wind generators is more complicated, so that the insulation system is affected by factors including high humidity, high temperature difference, heavy salt spray, etc. during long-term operation. In response to actual operating requirements, the reliability evaluation methods of wind generator insulation systems are introduced from different dimensions, including longterm heat resistance, electrical stress durability and environmental reliability. Various methods are analyzed, so that the complete machine manufacturer can choose the appropriate evaluation method according to the actual demand and improve the reliability of the wind generator products.
2021, 48(8):98-105.
DOI: 10.12177/emca.2021.071
Abstract:
Aiming at the fact that the traction network boundary of the through-type co-phase auto-transformer (AT) traction power supply system has a strong attenuation effect on high-frequency transients, a single-ended current direction transient protection method of traction network based on morphology is proposed. The multi-resolution morphological gradient is used to process the fault transient current detected at the protection installation, and the polarity of the mutation point of the line mode component is obtained, which constitutes the directional start element. If the polarity is negative, the fault occurs outside the local area, and the protection does not operate. If the polarity is positive, it is necessary to further calculate the morphological spectrum of the fault current line mode component, and convert the normalized morphological spectrum to the frequency domain. By comparing the size of the morphological spectrum value and the threshold in the frequency domain, the fault is judged to be an internal fault or an external fault on the opposite side. The through-type co-phase AT traction power supply system is built on PSCAD, and plenty of fault simulations are conducted for different situations. The simulation results show the availability of the protection method.
Aiming at the fact that the traction network boundary of the through-type co-phase auto-transformer (AT) traction power supply system has a strong attenuation effect on high-frequency transients, a single-ended current direction transient protection method of traction network based on morphology is proposed. The multi-resolution morphological gradient is used to process the fault transient current detected at the protection installation, and the polarity of the mutation point of the line mode component is obtained, which constitutes the directional start element. If the polarity is negative, the fault occurs outside the local area, and the protection does not operate. If the polarity is positive, it is necessary to further calculate the morphological spectrum of the fault current line mode component, and convert the normalized morphological spectrum to the frequency domain. By comparing the size of the morphological spectrum value and the threshold in the frequency domain, the fault is judged to be an internal fault or an external fault on the opposite side. The through-type co-phase AT traction power supply system is built on PSCAD, and plenty of fault simulations are conducted for different situations. The simulation results show the availability of the protection method.
2021, 48(8):106-113.
DOI: 10.12177/emca.2021.059
Abstract:
In order to diagnosis mechanical faults in gas insulated transmission line (GIL) effectively, the 110 kV GIL experimental platform is built and three typical mechanical faults are designed. The joint method of complementary ensemble empirical mode decomposition (CEEMD) fuzzy entropy and whale optimization algorithm-extreme learning machine (WOA-ELM) model is used to identify and diagnose the GIL mechanical fault mode. Firstly, the CEEMD method is used to decompose the vibration signal, and the positive and negative white noise is introduced to process the signal to obtain the modal component with fault information. Secondly, the fuzzy entropy is used to calculate the eigenvalues of modal component to obtain the fuzzy entropy which can represent the fault features. Finally, the WOA-ELM model is used to recognize the eigenvector set, and the clustering results and adaptive threshold are used to analyze the fault features. The mechanical fault of GIL equipment can be diagnosed and forewarned by using the value. The results show that, combining CEEMD and fuzzy entropy to analyze GIL vibration signal can effectively avoid the interference of modal aliasing and redundant noise components, and obtain the eigenvalues that can characterize the fault characteristics; using WOA-ELM model can effectively realize GIL equipment mechanical fault diagnosis and early warning.
In order to diagnosis mechanical faults in gas insulated transmission line (GIL) effectively, the 110 kV GIL experimental platform is built and three typical mechanical faults are designed. The joint method of complementary ensemble empirical mode decomposition (CEEMD) fuzzy entropy and whale optimization algorithm-extreme learning machine (WOA-ELM) model is used to identify and diagnose the GIL mechanical fault mode. Firstly, the CEEMD method is used to decompose the vibration signal, and the positive and negative white noise is introduced to process the signal to obtain the modal component with fault information. Secondly, the fuzzy entropy is used to calculate the eigenvalues of modal component to obtain the fuzzy entropy which can represent the fault features. Finally, the WOA-ELM model is used to recognize the eigenvector set, and the clustering results and adaptive threshold are used to analyze the fault features. The mechanical fault of GIL equipment can be diagnosed and forewarned by using the value. The results show that, combining CEEMD and fuzzy entropy to analyze GIL vibration signal can effectively avoid the interference of modal aliasing and redundant noise components, and obtain the eigenvalues that can characterize the fault characteristics; using WOA-ELM model can effectively realize GIL equipment mechanical fault diagnosis and early warning.
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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.
