Self-tuning Control Method of Active Frequency Support of Clustering Photovoltaic Power Plants

doi:10.11930/j.issn.1004-9649.202112014

Abstract

Abstract: As existing photovoltaic power plants implement droop control to adjust output and thereby suppress random and irregular output fluctuations on the supply side after detecting frequency changes, a time lag occurs in the frequency modulation process. On the basis of self-tuning control, this paper proposes a control strategy of active frequency support that can smooth second-level output fluctuations of photovoltaic power for photovoltaic power plants. According to the light fluctuation at the disturbed photovoltaic power plant, the reference active power is automatically corrected through feedforward compensation, and the active power setpoint of each photovoltaic power plant is redistributed adaptively. The output fluctuation at the disturbed power plant is thereby actively compensated before the frequency changes significantly. A simulation example is built with Matlab/Simulink. The simulation results show that compared with droop control, the proposed self-tuning control effectively improves the frequency performance of the system by elevating the lowest frequency point by about 0.04 Hz under disturbances and reducing the average frequency change rate by about 26.06%.

Key words: photovoltaic power plant, self-tuning control, output smoothing, active support, frequency

LIU Gang, CHEN Haidong, SUN Ruizhe, PENG Peipei. Self-tuning Control Method of Active Frequency Support of Clustering Photovoltaic Power Plants[J]. Electric Power, 2022, 55(9): 156-162.

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URL: https://www.electricpower.com.cn/EN/10.11930/j.issn.1004-9649.202112014

https://www.electricpower.com.cn/EN/Y2022/V55/I9/156

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