1.Key Laboratory of Control of Power Transmission and Conversion, Ministry of Education (Shanghai Jiao Tong University), Shanghai 200240, China;2.Nanjing Power Supply Company of State Grid Jiangsu Electric Power Co., Ltd, Nanjing 210019, China
This work is supported by National Key R&D Program of China (No. 2016YFB0900504).
Droop coefficients of inverters for distributed generators in AC/DC hybrid microgrid can have great influences on feasibility region of power flow in island operation mode. While traditional droop coefficients are determined by capacity and frequency of inverters and voltage regulation range, which can not give full consideration of the above influence. To fill the gap, a calculation model for power flow of AC/DC hybrid microgrid considering control modes of inverter is firstly established. Then a fast calculation method of feasibility region of power flow in parameter space is proposed, the impact of droop coefficients on feasibility region of power flow is further considered. The optimal values of droop coefficients are suggested by overall considering both load stability margin and small-signal stability factors. Finally, an improved 12-node AC/DC hybrid microgrid is simulated to verify the effectiveness and applicability of the proposed method. Results show that the voltage stability margin is significantly increased compared with traditional methods.
PANG Lei,HAN Bei,WANG Keyou,et al.Selection of Droop Coefficients for AC/DC Hybrid Microgrid Considering Feasibility Region of Power Flow in Parameter Space[J].Automation of Electric Power Systems,2020,44(10):77-84.DOI:10.7500/AEPS20190909004Copy