无功补偿与去磁电流协同控制的改进DFIG高电压穿越策略

Cooperative Control of Reactive Power Compensation and Demagnetization Current Improved DFIG High Voltage Ride Through Strategy

为解决双馈感应发电机(DFIG)难以满足严重电网电压骤升故障时穿越测试要求问题,提出了基于无功补偿与去磁电流协同控制的改进DFIG高电压穿越控制策略。在网侧变换器无功补偿稳定直流母线电压的基础上,协同转子侧变换器去磁电流控制,确保有功功率平衡及RSC容量完全利用情况下向转子注入无功。对比传统方法,改进控制策略有严重骤升故障适应性强与转子侧变换器(RSC)容量利用率高的双重优势。最后在Matlab/Simulink搭建模型,仿真结果验证所提方案能更好地满足风电机组HVRT的测试要求,实现高电压穿越。

In order to solve the problem that double-fed induction generator(DFIG)cannot meet the requirement of voltage surge fault traversal test,an improved DFIG high voltage traversal control strategy is proposed based on the cooperative control of reactive power compensation and demagnetization current.On the basis of stabilizing DC bus voltage by reactive power compensation of grid-side converter,reactive power is injected into the rotor under the condition of active power balance and full utilization of RSC capacity by cooperating with demagnetization current control of rotor-side converter.Compared with the traditional methods,the improved control strategy has dual advantages of strong adaptability to severe sudden voltage swell and high capacity utilization of RSC.Finally,a model is built in Matlab/Simulink.The simulation results show that the proposed scheme can better meet the test requirements of HVRT for wind turbines and achieve high voltage ride through.