Power control strategy for parallel operation of isolated island microgrid with two stations
a new method for parallel operation of stations is proposed based on the control of energy storage SOC(State of Charge)deviation,aimed at reducing the SOC difference during the charging and discharging of dual stations,to achieve consistency in the charging and discharging curves at a certain moment from different starting SOCs.The objective is to improve the voltage quality and the consistency of distributed energy storage SOC within a distribution network containing distributed power sources in a certain is-land of Hong Kong.The microgrid consists of Station A and Station B,where Station A operates in V/F mode to ensure the output voltage has the same amplitude and frequency,while Station B employs P/Q control.Based on the most recently collected operational data,the power setting reference value is calculated by an embedded logic algorithm within the intelligent station controller and auto-matically sends the P and Q setting values to the PCS of Station B.In the P/Q control mode,the energy storage battery outputs reac-tive power to support reactive power,reducing the reactive power and current on the connecting lines and lowering the voltage devia-tion on the connecting lines.Moreover,under the extreme SOC states of energy storage,over-frequency load shedding can be used to ensure the stable operation of the system.This method can achieve optimal operational costs and the highest safety under any circum-stances while satisfying the principle of energy storage SOC equilibrium.The effectiveness and reliability of the proposed strategy have been proven through simulations and experimental validations conducted on the Matlab simulation platform and a hardware experimen-tal platform,demonstrating the method's ease in achieving a rational power distribution between Stations A and B.
microgridparallel operationP/Q controlSOC balancereactive power support
万方数据
维普
