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为研究多变量、强耦合和非线性的统一潮流控制器(unified power flow controller,UPFC)在微电网中的潮流控制作用,一方面,从理论上分析线路潮流与串联注入电压的数学关系;另一方面,采用基于微分几何的状态反馈精确线性化控制策略,在给定参考功率的基础上,对含UPFC的微电网系统的潮流控制响应进行仿真研究。仿真结果表明,运用非线性控制策略设计的UPFC不但能维持并联侧电压和直流电容电压的稳定,并且可很好地跟踪各控制目标,有效地控制线路潮流,满足微电网对输变电系统提出的灵活调节、高效输送的要求。
In order to study the power flow control effect of multi-variable, strongly coupled and nonlinear unified power flow controller (UPFC) in microgrid, on the one hand, the mathematical relationship between line power flow and series injection voltage is theoretically analyzed. On the one hand, the state feedback precise linearization control strategy based on differential geometry is used to simulate the power flow control response of UPFC-containing micro-grid system on the basis of given reference power. The simulation results show that the UPFC designed by nonlinear control strategy can not only maintain the stability of voltage and DC capacitor voltage in parallel connection, but also keep track of each control target and effectively control the line power flow to meet the requirements of microgrid for power transmission and transformation Flexible regulation, efficient delivery requirements.