UPFC的潮流和机电暂态仿真模型研究

The UPFC Model Study in Power System Power-flow and Electro-mechanic Transient Simulation

统一潮流控制器(UPFC)可同时控制母线电压和线路功率,对提高系统稳定性具有较大作用,建立UPFC的潮流和机电暂态仿真模型是电力系统仿真分析的重要基础。文中基于UPFC的基本原理和控制规律,提出了UPFC在潮流程序中的处理方法和在机电暂态稳定程序中的简化模型。在潮流程序中,将UPFC模型等效为两侧的功率注入和PV节点;在机电暂态仿真中,忽略动作速度快、影响较小的快速控制部分和内部环节,建立串联功率控制和并联电压控制的简化仿真模型。该模型在PSD-BPA程序中完成了开发,并与MATLAB详细仿真模型进行了对比,结果表明本文提出的简化模型具有较好的准确性。

The UPFC is capable to control bus voltage and line power at the same time, which can improve power system stability greatly. The power-flow and electro-mechanic transient simulation model of UPFC is the basis for power system simulation. Based on the basic theory and control characteristic of UPFC, this paper proposes a method to duel with UPFC in power flow program and a simplified model for UPFC in electro-mechanic transient simulation program. In the power flow simulation, UPFC is equivalent to power injection of both ends and PV bus type. In the electro-mechanic transient simulation,some inner control sections and fast control sections are ignored which are fast and have smaller influence on the whole characteristic, so that the simplified simulation model is proposed for series power control and shunt voltage control. The simulation model is developed in PSD-BPA software and is contrast with the detailed model in MATLAB. The results show that the simplified model has good accuracy.