期刊
IEEE JOURNAL OF EMERGING AND SELECTED TOPICS IN POWER ELECTRONICS
卷 9, 期 6, 页码 7306-7319出版社
IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC
DOI: 10.1109/JESTPE.2020.3013230
关键词
Mathematical model; Fault currents; Voltage control; Microgrids; Radio frequency; Generators; Control systems; AC microgrid; current-limiting ability; improved Lyapunov-function method; power-state equation method
资金
- National Key Research and Development Program of China [2016YFB09006030]
- Science and Technology Project of State Grid Corporation of China-Research on Key Protection Technologies for New-Type Urban Distribution Network with Controllable Sources and Loads [SGHE0000-DKJS1900093]
This study investigates a control method suitable for AC microgrid with strong current-limiting ability, achieving accurate power tracking through outer loop controller and inductance current tracking through inner loop controller to meet desired requirements for current harmonics and amplitudes.
With the occurrence of the major blackouts in Australia 9 center dot 28 and the U.K. 8 center dot 9, the technical bottlenecks in the power generation system with a high proportion of renewable energy have attracted more and more attention. Based on this background, this article studies a control method that is suitable for AC microgrid with strong current-limiting ability. First, the outer loop controller adopts the method of power-state equation based on PI control to achieve accurate tracking of the reference power. Furthermore, in order to make the fault current having a lower asymmetry degree and smaller amplitude, the outer loop controller only considers the positive-sequence components of the voltage and adds twice rated current limiter. Second, the inner loop controller adopts an improved Lyapunov-function method with antiparametric disturbance ability to track the reference inductance current. By selecting the optimal controller gains, the current harmonics and amplitudes can meet the desired requirements. Finally, the simulation builds a microgrid with four distributed generators (DGs) in MATLAB/Simulink and tests the effectiveness of the proposed current-limiting method.
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