微电网中基于复合虚拟阻抗的同步电压源控制策略研究
摘要：传统的基于下垂特性曲线的同步电压源控制没有考虑分布式电源之间线路阻抗的影响,直接应用于微电网中分布式电源的控制,会影响系统的稳定性和功率均分。本文提出了一种基于复合虚拟阻抗的改进同步电压源控制,引入复合虚拟阻抗削弱线路阻抗模型中阻性成分带来的功率耦合,引入公共负荷点电压反馈,通过改进电压/无功下垂控制解决线路阻抗标么值不等带来的无功功率均分问题。采用改进的同步电压源控制能够实现系统功率的准确均分,并且改善系统的供电质量。仿真结果验证了本文控制算法的有效性。
Abstract:Due to not considering the impact of feeder impedance between distributed sources, conventional synchronous voltage source converter control based on droop characteristic curve will influence system stability and power sharing when applied in distributed resources of microgrid. In this paper, an improved synchronous voltage source converter control based on complex virtual impedance is proposed, in which complex virtual impedance is introduced to reduce the power coupling caused by resistive component in feeder impedance model, and an improved voltage/reactive power droop control is proposed to eliminate reactive power sharing errors due to unequal the line impedance per unit value by introducing voltage feedback on public load nodes. Accurate system power sharing can be achieved by the improved synchronous voltage source control, and the quality of power supply is improved. In the end, the validity of control algorithm is verified by simulations.
标题：微电网中基于复合虚拟阻抗的同步电压源控制策略研究
英文标题：Research on Control Strategy of Synchronous Voltage Source Converter Based on Complex Virtual Impedance in Microgrid
作者：刘真, 鲍薇,
关键词：微电网, 复合虚拟阻抗, 同步电压源控制, 线路阻抗, 功率均分,
发表日期：2014-04-09
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