Active damping(AD)strategy is an economical and efficient method to solve the resonant problem of the permanent magnet synchronous motor(PMSM)drive system with inductor-capacitor(LC)sine wave filter.In this article,th...Active damping(AD)strategy is an economical and efficient method to solve the resonant problem of the permanent magnet synchronous motor(PMSM)drive system with inductor-capacitor(LC)sine wave filter.In this article,the AD methods used in PMSM drive system are classified as inherent damping(ID),state variable feedback,and digital filter.Based on this,the purpose of this article is to provide an overview and analysis of the AD methods on PMSM drive system in recent years,and to comprehensively review,compare,and summarize the stability,dynamic performance,robustness,and algorithm complexity.Furthermore,a new expansion of AD method based on capacitor current feedback with high-pass filter(HPF-CCF)is studied to ensure the effectiveness when the resonant frequency is around sixth of the sampling frequency.The simulation and experimental results validate the effectiveness of theoretical analysis.展开更多
The rectifier filter circuit is widely applied.However,it is difficult to gain a global solution for the optimization design.4-D visual analysis and design optimization of the single-phase uncontrolled bridge rectifie...The rectifier filter circuit is widely applied.However,it is difficult to gain a global solution for the optimization design.4-D visual analysis and design optimization of the single-phase uncontrolled bridge rectifier with an LC filter are presented in this paper.展开更多
The aim of this work is to study the stability and control of input of three-phase photovoltaic voltage source inverters connected to the LC （inductor and capacitor） filter. A PI （proportional-integral） classical ...The aim of this work is to study the stability and control of input of three-phase photovoltaic voltage source inverters connected to the LC （inductor and capacitor） filter. A PI （proportional-integral） classical controller approach is established in the control, including a MPPT （maximum power point tracking） based on incremental conductance algorithm, the MPPT improves the speed and the tracking accuracy, to rapidly track the MPPT from photovoltaic with various weather conditions, and effectively eliminate the oscillation phenomena near the MPPT. The control system can stabilize and improve the system performances, and the simulation results show the high stability, high efficiency and robustness of the proposed control with good performances.展开更多
A new structure of integrated low-pass LC filter of DC-DC power converter is proposed in this paper. This filter consists in a circular planar coil enclosed between two ferrites substrates. Mn-Zn ferrite has been chos...A new structure of integrated low-pass LC filter of DC-DC power converter is proposed in this paper. This filter consists in a circular planar coil enclosed between two ferrites substrates. Mn-Zn ferrite has been chosen because of its high permeability and permittivity. In this filter Mn-Zn substrates act not only as a magnetic core but also as a capacitor. In order to reduce the conduction losses in the part of the ferrite used as a capacitor, a particular topology using a blocking layer is proposed. A modelling of the dielectric behaviour of the materials has been performed and injected in a simulation in order to find the resulting LC filter performances and its power range of use. In order to increase the filter efficiency, different solutions have been explored. In particular the inter-turn gap evolution has been optimized to reduce the inter-turn losses. Regarding the bulk losses, BaTiO3?blocking layers have?been added, either upon the ground or the conductor. In this last case a co-firing ferrite tape has been inserted between turns to increase the LC product. Finally the use of low losses Mn-Zn and BaTiO3?has been proposed and the final characteristics (both electrical and dimensional) of our filter have been compared toconventional ones.展开更多
The loss mechanisms of different passive devices （on-chip inductors and capacitors） on different substrates are analyzed and compared. OPS （oxidized porous silicon） and HR （high-resistivity） substrates are used ...The loss mechanisms of different passive devices （on-chip inductors and capacitors） on different substrates are analyzed and compared. OPS （oxidized porous silicon） and HR （high-resistivity） substrates are used as low-loss substrates for on-chip planar LPF （low pass filter） fabrication. For the study of substrate loss, a planar coil inductor is also designed. Simulation results show that Q （the quality factor） of the inductor on both substrates is over 20. Measurements of the LPF on OPS substrate give a - 3dB bandwidth of 2.9GHz and a midband insertion loss of 0.87dB at 500MHz. The LPF on HR substrate gives a - 3dB bandwidth of 2.3GHz and a midband insertion loss of 0.42dB at 500MHz.展开更多
This paper presents the energy saving method by applying the voltage control technique on a single-phase AC source to a thyristor rectifier and an IGBT inverter with LC filter. Based on the LC filter parameter, the va...This paper presents the energy saving method by applying the voltage control technique on a single-phase AC source to a thyristor rectifier and an IGBT inverter with LC filter. Based on the LC filter parameter, the values of the gain for the controller are obtainable. The proposed controller structure consist</span><span style="font-family:Verdana;">s</span><span style="font-family:Verdana;"> of two loops arranged in a cascaded model. The output of the first loop is the capacitor current. This current is added to the load current in order to obtain the current reference. This reference current value will be compared with the inverter current which produces the error signal to be fed into the second loop in the cascade system. The output of the second loop is the inverter voltage. This voltage is added to the load voltage to produce the voltage reference. This reference is fed to the pulse width modulation generator via the controller and compared with the triangular wave. This energy-saving circuit is designed in blocks using MATLAB Simulink.展开更多
In this article,the LCL filter used for the three-phase two-level inverter with six-pulse control is designed from the components of the LC filter by means of a coefficient k varying between 0 and 1.The coefficient k ...In this article,the LCL filter used for the three-phase two-level inverter with six-pulse control is designed from the components of the LC filter by means of a coefficient k varying between 0 and 1.The coefficient k is used to determine the values of the inductances of the LCL filter in relation to the inductance of the LC filter.The capacitor capacity of the LCL filter is identical to that of the LC filter.To obtain the RMS voltage and current of the load,a method based on measuring the error of the RMS voltage and current of the load is proposed.This approach,applied to the three-phase,two-level inverter with 180˚full-wave control,enables us to reduce the value of the LCL filter inductance.Satisfactory results are obtained by simulation on MATLAB-Simulink software and compared with the LCL filter results.展开更多
Modern electric power systems have increased the usage of switching power converters.These tightly regulated switching power converters behave as constant power loads(CPLs).They exhibit a negative incremental impedanc...Modern electric power systems have increased the usage of switching power converters.These tightly regulated switching power converters behave as constant power loads(CPLs).They exhibit a negative incremental impedance in small signal analysis.This negative impedance degrades the stability margin of the interaction between CPLs and their feeders,which is known as the negative impedance instability problem.The feeder can be an LC input filter or an upstream switching converter.Active damping methods are preferred for the stabilization of the system.This is due to their higher power efficiency over passive damping methods.Based on different sources of damping effect,this paper summarizes and classifies existing active damping methods into three categories.The paper further analyzes and compares the advantages and disadvantages of each active damping method.展开更多
基金supported in part by the National Natural Science Foundational of China under Grants 62373363 and 52007190
文摘Active damping(AD)strategy is an economical and efficient method to solve the resonant problem of the permanent magnet synchronous motor(PMSM)drive system with inductor-capacitor(LC)sine wave filter.In this article,the AD methods used in PMSM drive system are classified as inherent damping(ID),state variable feedback,and digital filter.Based on this,the purpose of this article is to provide an overview and analysis of the AD methods on PMSM drive system in recent years,and to comprehensively review,compare,and summarize the stability,dynamic performance,robustness,and algorithm complexity.Furthermore,a new expansion of AD method based on capacitor current feedback with high-pass filter(HPF-CCF)is studied to ensure the effectiveness when the resonant frequency is around sixth of the sampling frequency.The simulation and experimental results validate the effectiveness of theoretical analysis.
文摘The rectifier filter circuit is widely applied.However,it is difficult to gain a global solution for the optimization design.4-D visual analysis and design optimization of the single-phase uncontrolled bridge rectifier with an LC filter are presented in this paper.
文摘The aim of this work is to study the stability and control of input of three-phase photovoltaic voltage source inverters connected to the LC （inductor and capacitor） filter. A PI （proportional-integral） classical controller approach is established in the control, including a MPPT （maximum power point tracking） based on incremental conductance algorithm, the MPPT improves the speed and the tracking accuracy, to rapidly track the MPPT from photovoltaic with various weather conditions, and effectively eliminate the oscillation phenomena near the MPPT. The control system can stabilize and improve the system performances, and the simulation results show the high stability, high efficiency and robustness of the proposed control with good performances.
文摘A new structure of integrated low-pass LC filter of DC-DC power converter is proposed in this paper. This filter consists in a circular planar coil enclosed between two ferrites substrates. Mn-Zn ferrite has been chosen because of its high permeability and permittivity. In this filter Mn-Zn substrates act not only as a magnetic core but also as a capacitor. In order to reduce the conduction losses in the part of the ferrite used as a capacitor, a particular topology using a blocking layer is proposed. A modelling of the dielectric behaviour of the materials has been performed and injected in a simulation in order to find the resulting LC filter performances and its power range of use. In order to increase the filter efficiency, different solutions have been explored. In particular the inter-turn gap evolution has been optimized to reduce the inter-turn losses. Regarding the bulk losses, BaTiO3?blocking layers have?been added, either upon the ground or the conductor. In this last case a co-firing ferrite tape has been inserted between turns to increase the LC product. Finally the use of low losses Mn-Zn and BaTiO3?has been proposed and the final characteristics (both electrical and dimensional) of our filter have been compared toconventional ones.
文摘The loss mechanisms of different passive devices （on-chip inductors and capacitors） on different substrates are analyzed and compared. OPS （oxidized porous silicon） and HR （high-resistivity） substrates are used as low-loss substrates for on-chip planar LPF （low pass filter） fabrication. For the study of substrate loss, a planar coil inductor is also designed. Simulation results show that Q （the quality factor） of the inductor on both substrates is over 20. Measurements of the LPF on OPS substrate give a - 3dB bandwidth of 2.9GHz and a midband insertion loss of 0.87dB at 500MHz. The LPF on HR substrate gives a - 3dB bandwidth of 2.3GHz and a midband insertion loss of 0.42dB at 500MHz.
文摘This paper presents the energy saving method by applying the voltage control technique on a single-phase AC source to a thyristor rectifier and an IGBT inverter with LC filter. Based on the LC filter parameter, the values of the gain for the controller are obtainable. The proposed controller structure consist</span><span style="font-family:Verdana;">s</span><span style="font-family:Verdana;"> of two loops arranged in a cascaded model. The output of the first loop is the capacitor current. This current is added to the load current in order to obtain the current reference. This reference current value will be compared with the inverter current which produces the error signal to be fed into the second loop in the cascade system. The output of the second loop is the inverter voltage. This voltage is added to the load voltage to produce the voltage reference. This reference is fed to the pulse width modulation generator via the controller and compared with the triangular wave. This energy-saving circuit is designed in blocks using MATLAB Simulink.
文摘In this article,the LCL filter used for the three-phase two-level inverter with six-pulse control is designed from the components of the LC filter by means of a coefficient k varying between 0 and 1.The coefficient k is used to determine the values of the inductances of the LCL filter in relation to the inductance of the LC filter.The capacitor capacity of the LCL filter is identical to that of the LC filter.To obtain the RMS voltage and current of the load,a method based on measuring the error of the RMS voltage and current of the load is proposed.This approach,applied to the three-phase,two-level inverter with 180˚full-wave control,enables us to reduce the value of the LCL filter inductance.Satisfactory results are obtained by simulation on MATLAB-Simulink software and compared with the LCL filter results.
文摘Modern electric power systems have increased the usage of switching power converters.These tightly regulated switching power converters behave as constant power loads(CPLs).They exhibit a negative incremental impedance in small signal analysis.This negative impedance degrades the stability margin of the interaction between CPLs and their feeders,which is known as the negative impedance instability problem.The feeder can be an LC input filter or an upstream switching converter.Active damping methods are preferred for the stabilization of the system.This is due to their higher power efficiency over passive damping methods.Based on different sources of damping effect,this paper summarizes and classifies existing active damping methods into three categories.The paper further analyzes and compares the advantages and disadvantages of each active damping method.
