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HU Wenqiang,WU Zaijun,DOU Xiaobo,WANG Jianhua,LI Chenyang,HU Minqiang.Virtual Synchronous Generator with Power Quality Composite Control Function[J].JOURNAL OF POWER SUPPLY,2018,16(6):18-26
Virtual Synchronous Generator with Power Quality Composite Control Function
Received:July 16, 2018  Revised:October 27, 2018
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DOI:10.13234/j.issn.2095-2805.2018.6.18
Keywords:virtual synchronous generator(VSG)  power quality composite control  FBD method  quasi-proportional re-sonance control
Fund Project:The National Natural Science Foundation of China (General Program, Key Program, Major Research Plan)
                 
AuthorInstitutionEmail
HU Wenqiang School of Electrical Engineering, Southeast University, Nanjing , China
WU Zaijun School of Electrical Engineering, Southeast University, Nanjing , China zjwu@seu.edu.cn
DOU Xiaobo School of Electrical Engineering, Southeast University, Nanjing , China
WANG Jianhua School of Electrical Engineering, Southeast University, Nanjing , China
LI Chenyang School of Electrical Engineering, Southeast University, Nanjing , China
HU Minqiang School of Electrical Engineering, Southeast University, Nanjing , China
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Abstract:
      The access environment of a unit virtual synchronous generator(VSG) often faces power quality problems. Accordingly, a VSG with power quality composite control function is proposed in this paper, and a three-phase four-leg converter structure is adopted in its topology. Under this control strategy, the VSG power outer-loop control and improved virtual impedance control are used to generate fundamental power current instructions, the improved FBD method based on sliding Goertzel transform is used to detect compensation current, and the multiple quasi-proportional resonance control is used to track fundamental and compensation current instructions. Finally, three-dimensional space vector modulation generates the driving signals for the four-leg converter. An RT-Lab hardware-in-loop experiment proved that the VSG can compensate load harmonics, reactive power, and unbalanced current while inertia responds to the variations of frequency/voltage of power grid, which is suitable for non-ideal power grid conditions.
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