Improved Model Predictive Direct Power Control of Grid Side Converter in Weak Grid Using Kalman Filter and DSOGI*

doi:10.23919/CJEE.2019.000024

Chinese Journal of Electrical Engineering ›› 2019, Vol. 5 ›› Issue (4): 22-32.doi: 10.23919/CJEE.2019.000024

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Improved Model Predictive Direct Power Control of Grid Side Converter in Weak Grid Using Kalman Filter and DSOGI^*

Liang Chen, Heng Nian^*, Yunyang Xu

College of Electrical Engineering, Zhejiang University, Hangzhou 310027, China

Online:2019-12-25 Published:2020-03-12
Contact: * Email: nianheng@zju.edu.cn
About author:Liang Chen received the B.E. degree from Zhejiang University, Hangzhou, China, in 2016. He is currently working towards the Ph.D of electrical engineering in Zhejiang University. His research interests include modeling of integration of renewable energy to the grid and corresponding stability analysis.
Heng Nian (M’09–SM’14) received the B.E. degree and the M.E. degree from Hefei University of Technology, China, and the Ph.D. degree from Zhejiang University, China, in 1999, 2002, and 2005 respectively, all in electrical engineering. From 2005 to 2007, he was as a Post-doctoral with the College of Electrical Engineering, Zhejiang University, China.In 2007, he was promoted as an associate professor. Since 2016, he has been a full professor at the College of Electrical Engineering, Zhejiang University, China. From 2013 to 2014, he was a visiting scholar at the Department of Electrical, Computer, and System Engineering, Rensselaer Polytechnic Institute, Troy, NY. His current research interests include the optimal design and operation control for wind power generation system. He has published more than 20 IEEE/IET Transaction papers and held more than 20 issued/pending patents.
Yunyang Xu was born in Deyang, China. She received the B.E. degree from Zhejiang University, Hangzhou, China, in 2016. She is currently working towards the Ph.D. degree of electrical engineering in Zhejiang University. Her research interests include small-signal modeling of renewable generators, their integration to the electric grid and system stability analysis
Supported by:
* Supported by National Natural Science Foundation of China(51622706).

Abstract

Abstract: When grid side converter (GSC) is connected to weak grid, the small signal instability can happen due to terminal characteristics of the GSC that are incompatible with the grid impedance. This issue is not of wide concern in previous studies of direct power control (DPC) of GSC. By small signal analysis, it is shown that the impedance characteristic of the conventional direct power control GSC is not compatible with the inductive grid impedance in weak grid due to its constant power load behavior. To solve the problem, instead of feeding the DPC controller with direct measured voltage and current, a Kalman filter (KF) is used to obtain filtered output current and a double second-order generalized integrator (DSOGI) is used to obtain filtered voltage at the point of common coupling (PCC). These strategies change the impedance characteristic of the GSC dramatically and make it suitable to operate in weak grid where SCR is 2, while the rapid power response is preserved. The proposed strategy is verified through simulation and controller hardware in loop (CHIL) tests.

Key words: Direct power control, weak grid, grid side converter, stability

Liang Chen, Heng Nian, Yunyang Xu. Improved Model Predictive Direct Power Control of Grid Side Converter in Weak Grid Using Kalman Filter and DSOGI^*[J]. Chinese Journal of Electrical Engineering, 2019, 5(4): 22-32.

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Improved Model Predictive Direct Power Control of Grid Side Converter in Weak Grid Using Kalman Filter and DSOGI^*

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