基于电励磁直驱风电系统低电压运行特性的研究

The Research on Control Strategy of Low Voltage Ride-through of Electric Excitation Direct Driving Wind Turbine

本文针对电励磁直驱风电系统,分析了传统控制策略及低电压穿越特性,提出一种机侧变流器的限流模式,同时网侧变压器运行于无功优先输出模式的控制策略。该控制策略有效地降低了故障期间的直流侧过电压,提升了并网点电压。基于MATLAB/Simulink搭建了仿真平台,仿真结果表明该控制策略的有效性。

The traditional control theory and Low-voltage-ride-through （LVRT） Capability were analyzed based on the Electric Excitation Direct Driving Wind Turbine. An improved scheme was proposed. During grid voltage sag, the active current of generator-side converter is limited and the DC-link overvoltage is decreased. The grid-side converter operates at the reactive power priority mode and exports reactive power rapidly to increase the grid-side voltage. Matlab/Simulink model was set up, and simulation results verify the effectiveness and feasibility of the proposed control strategies.