Study on power oscillations suppression strategy of experimental microgrid based on power optimal control

2019 5th International Conference on Energy Materials and Environment Engineering

能源学;生态环境科学

Dongh, H.N.^1 ; Li, C.^2 ; Yao, R.Y.^2 ; Zhai, X.H.^2 ; Ding, X.Y.^2

Power Grid Technology Center, State Grid Liaoning Electric Power Co., Ltd., Liaoning Province, Shenyang

110006, China^1

School of Electrical Engineering, Shenyang University of Technology, Liaoning Province, Shenyang

110870, China^2

关键词: Control strategies;    Control system simulations;    Different structure;    Electrical quantities;    Negative sequence;    Power oscillations;    Simulation model;    Unbalanced voltages;   

Others  :  https://iopscience.iop.org/article/10.1088/1755-1315/295/4/042008/pdf
DOI  :  10.1088/1755-1315/295/4/042008

学科分类：环境科学（综合）

来源: IOP

【 摘 要 】

The experimental microgrid could provide a platform for operation and testing of the tested microgrid, so that the performance of the tested microgrid could be obtained before it was put into use. The microgrid had different structures, configurations, distributed generations and three-phase unbalanced load, so the voltage, current and power of the experimental microgrid would inevitably oscillate. First, the power oscillations mechanism of multi-source microgrid was deeply analysed, that was, the analytical relationship between active power pulsation and reactive power pulsation was derived and the influence of positive and negative sequence electrical quantities on power pulsation was revealed. Then, a power oscillations suppression strategy based on power optimal control was proposed. Finally, we built a multi-source microgrid simulation model and a power oscillations control system simulation model on MATLAB. The results showed that the control strategy proposed in this paper could significantly reduce the amplitude of power oscillations caused by unbalanced voltage and current. It could be verified that the control strategy was correct and effective.