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XIAO Huihui,AO Linfang,GUO Qiang,LI Shan.Research on AC and DC-side Decoupling Control Strategy for Current Source PWM Rectifier[J].JOURNAL OF POWER SUPPLY,2020,18(3):133-141
Research on AC and DC-side Decoupling Control Strategy for Current Source PWM Rectifier
Received:June 03, 2018  Revised:August 29, 2019
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DOI:10.13234/j.issn.2095-2805.2020.3.133
Keywords:current source rectifier  state feedback  active damping  decoupling control on AC and DC-side
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XIAO Huihui School of Electrical and Electronic Engineering, Chongqing University of Technology, Chongqing , China;Chongqing Engineering Research Center of Energy Internet, Chongqing , China
AO Linfang School of Electrical and Electronic Engineering, Chongqing University of Technology, Chongqing , China;Chongqing Engineering Research Center of Energy Internet, Chongqing , China
GUO Qiang School of Electrical and Electronic Engineering, Chongqing University of Technology, Chongqing , China;Chongqing Engineering Research Center of Energy Internet, Chongqing , China
LI Shan School of Electrical and Electronic Engineering, Chongqing University of Technology, Chongqing , China;Chongqing Engineering Research Center of Energy Internet, Chongqing , China
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Abstract:
      When three-phase current source rectifiers(CSRs) are applied as constant voltage power supply, the bu-lk capacitors are connected to the DC bus in parallel, which greatly increases the complexity in system modeling and the difficulty in control. To solve this problem, by aligning the d-axis with the AC capacitor voltage, the dynamic mathe-matical model under the d-q rotating frame can be simplified. To suppress resonances and DC-side voltage harmonics, a strategy composed of active damping control of a virtual resistor on the AC-side and state feedback control on the DC-side is proposed at first. The output variables can be controlled by adjusting the state variables and setting the state feedback coefficient, thus improving the system’s dynamic response characteristics and DC voltage-regulation performance. In addition, a high pass filter(HPF) is applied to reduce the influences of DC low-frequency signals on the AC-side. Owing to the low-frequency filtering characteristics of the DC LC circuit, the influences of AC high-frequency signals are suppressed, thereby realizing the independent decoupling control on AC and DC-side. Moreover, a unity power factor operation of the CSR on grid-side is achieved by regulating the q-axis switching component. At last, simulations are conducted using Matlab/Simulink, and results validate the rationality and feasibility of the proposed control strategy.
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