NDLI: Modelling and robust control of digitally controlled large-scale PV plants

Content Provider	IET Digital Library
Author	Xie, Bao Mao, Mingxuan Guo, Ke Zhou, Lin Liu, Tiantian Zhang, Qianjin Wan, Yihao
Abstract	Large-scale photovoltaic (PV) plants may be destabilised by the large grid impedance introduced by transformers and long transmission lines. When considering the digital control delay of grid-connected inverters, the problem will become more serious. In this study, the equivalent impedance model of digitally controlled large-scale PV plants is established, considering that the values of the parameters of the LCL filter follow Gaussian distributions. Then, the system stability can be analysed conveniently, and the stability analysis shows that the digital control delay will make the system robust to large grid impedance worse. To enhance the stability-robustness of the system, an H ∞ robust controller is proposed in this study. By properly selecting the weighting functions, the desired tracking error performance and robustness are achieved on the basis of the mixed-sensitivity optimisation control design. Compared with the traditional dual current loop control strategy, the H ∞ robust controller improves significantly the system stability-robustness against large grid impedance. Finally, simulation and experimental tests are carried out in this study, and the results demonstrate the effectiveness of the proposed H ∞ robust controller.
Starting Page	1291
Ending Page	1301
Page Count	11
ISSN	17554535
Volume Number	13
e-ISSN	17554543
Issue Number	Issue 7, May (2020)
Alternate Webpage(s)	https://digital-library.theiet.org/content/journals/iet-pel/13/7
Alternate Webpage(s)	https://digital-library.theiet.org/content/journals/10.1049/iet-pel.2019.0888
Journal	IET Power Electronics
Publisher Date	2020-01-20
Access Restriction	Open
Rights Holder	© The Institution of Engineering and Technology
Subject Keyword	Closed Loop System Control of Electric Power System Control System Analysis Control System Synthesis Desired Tracking Error Performance Digital Control Digital Control Delay Digitally Controlled Large-scale PV Plants Equivalent Impedance Model Gaussian Distribution Grid Impedance Grid-connected Inverter H∞ Control Invertors Large-scale Photovoltaic Plant LCL Filter Mixed-sensitivity Optimisation Control Design Optimal Control Photovoltaic Power System Power Generation Control Power Grid Power System Control Power System Stability Robust Control Robust Controller Solar Power Stations Stability in Control Theory Statistics Synthesis Method System Stability System Stability-robustness Traditional Dual Current Loop Control Strategy
Content Type	Text
Resource Type	Article
Subject	Electrical and Electronic Engineering

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