An Optimal Secondary Multi-Bus Voltage and Reactive Power Sharing Control Based on Non-Iterative Decoupled Linearized Power Flow for Islanded Microgrids

IEEE Access

Xin Kong¹  Mihai Dragos Rotaru²  Hui Hwang Goh³  Andrew Cruden⁴  Chee Shen Lim⁵  Yi Chyn Cassandra Wong⁵ 

[1] Energy Research Institute at NTU, Nanyang Technological University, Singapore;Institute of Microelectronics, Agency for Science, Technology and Research, Singapore;School of Electrical Engineering, Guangxi University, Nanning, China;School of Engineering, University of Southampton, Southampton, U.K.;University of Southampton Malaysia, Iskandar Puteri, Johor, Malaysia;

关键词: Microgrid;    droop control;    reactive power sharing;    voltage regulation;    optimal secondary control;    decoupled linearized power flow;   

DOI  :  10.1109/ACCESS.2021.3099432

来源: DOAJ

【 摘 要 】

The subject of optimal secondary control of power-electronic-interfaced distributed energy resources (DERs) in droop-controlled microgrids has garnered significant research attention in recent years. While the feasibility of optimal secondary control based on non-linear power flow has been proven, the power flow algorithm is essentially iterative in nature. This work proposes an optimal secondary control with non-iterative power flow to regulate multi-bus voltages and DERs’ reactive powers. The control scheme incorporates a modified Decoupled Linearized Power Flow that is known to be superior in terms of reactive power and bus voltage magnitude estimation, as compared to classical DC power flow, into a constrained quadratic programming. Q-V droop is integrated into the linear power flow in place of the slack bus. The proposed optimal scheme is provably accurate for maintaining reactive power sharing while regulating multiple load-bus voltages. The additional degrees of freedom enabled by the weighting factors significantly improve the control flexibility of the secondary controller. The allowable bus voltages and DER kVar capacity limits have also been considered by the control algorithm. The work is proven through an accurate co-simulation study comprising an 18-bus network and a full primary control models in PowerFactory, interfaced through industrial communication tool MatrikonOPC.

【 授权许可】

Unknown