杨旭红,何超杰.微电网多逆变器运行的自适应下垂控制新策略[J].电测与仪表,2017,54(4):. Yang Xuhong,He Chaojie.A New Adaptive Droop Control Strategy of Micro Grid’s Iverters in Parallel Operation[J].Electrical Measurement & Instrumentation,2017,54(4):.
微电网多逆变器运行的自适应下垂控制新策略
A New Adaptive Droop Control Strategy of Micro Grid’s Iverters in Parallel Operation
Due to the island operation of low voltage micro grid is affected the influence of such factors as the line impedance isn’t consistent, the traditional droop control can"t distribute power according to the unit capacity of the distributed power (DG) reasonably, therefore this paper proposes a new adaptive droop control strategy. The paper analyzes the Inverter’s electrical characteristic in parallel operation and in the mode of the island operation and virtual impedance technology and traditional droop control strategy. Then it designs the Inverter’s virtual impedance and P-U droop control loop afresh and remains traditional Q-f droop control loop unchanged. The principle of designing P-U droop control loop is based on utilizing the integral of active power P to lock the voltage difference and using sine function to solve the problem of output voltage falling over time caused by the integral, in the mean time, utilizing linear differential adjustment of traditional P-U droop control droop to improve the speed of adjustment and the design and distributes the active power P effectively.Through the simulation results show that the strategy can realize zero error output adjustment and not be affected by the changing of output impedance and line impedance, comparing the deviating regulation of traditional droop control strategy.
