统一潮流控制器在风电机组并网运行中的应用

Implementation of UPFC on wind farm interconnected to power grid

大规模风电并网改变了原来电网的潮流分布、线路传输功率以及电网故障时的暂态特性。将统一潮流控制器(UPFC)应用于异步风电机组并网的环形输电网络模型中,研究UPFC改善风电并网的性能。通过设计UPFC并联侧的双闭环反馈控制,设置风电输出线路三相短路故障来研究UPFC提高风电场低电压穿越能力。再建立UPFC串联侧有功与无功的独立控制系统,向输电线路输出补偿电压,研究其优化风电并网系统的潮流分布能力。在Matlab/Simulink软件中建立模型,仿真结果表明基于UPFC强大的无功补偿能力与潮流控制能力,UPFC能够显著提高风电并网的低电压穿越能力和优化潮流分布。

Large-scale wind power integration changes the power flow distribution, line transmission power and transient characteristics of the original power grid. This paper applies unified power flow controller （UPFC） to the wind farm interconnected to circular transmission network model and studies the performance of the wind power grid improved by UPFC. The double closed loop feedback control of UPFC shunt-side converter is used to improve the low voltage ride through capability during three phase short circuit fault of wind power output line. The active and reactive power independent control system of UPFC series-side converter is used to output offset voltage to transmission lines to study the power flow optimization of the wind power integration. The model is built by Matlab/Simulink and the simulation result verifies the improvement of the LVRT capability and the optimization of the power flow based on the reactive power compensation and power flow control ability of UPFC.