考虑逆变电源控制模式的微电网三相潮流模型

Three-phase Power Flow Model for Microgrid Considering Inverter Control Modes

考虑微电网的不对称性和逆变电源控制特性的多样性,提出适用于微电网三相潮流计算分析的数学模型。从逆变电源两种控制模式的对称条件出发,考虑逆变电源的多种控制目标和控制方式,提出电压控制型逆变电源的改进PQ节点和PV节点潮流模型,以及电流控制型逆变电源的Droop节点和PI节点模型。在此基础上,进一步考虑负荷的电压/频率调节特性,建立了微电网三相潮流模型。采用牛顿–拉夫逊方法求解该模型,并通过IEEE 13节点修正系统验证所提模型的有效性。算例结果表明,所提出的潮流模型能够反映逆变电源的控制特性,适用于各种控制模式及控制方式的微电网三相潮流计算分析。

This paper presented a three-phase power flow model for microgrid taking unbalanced characteristics and inverter control characteristics into account. Based on two different inverter control modes, both inverter control objective and control method were considered. The improved PQ and PV node type voltage controlled voltage source inverter （controlled-VSI） models, and Droop and PI node type current controlled-VSI models were presented. Furthermore, loads voltage/frequency characteristics were considered. Based on these considerations, a microgrid power flow model has been presented. It was tested on modified IEEE-13 bus distribution system by using Newton-Raphson method. The simulation results validate that the proposed model can reflect inverter control characteristics and suits for microgrid power flow analysis with different inverter control modes and control methods.