基于双补偿下垂—MQPR的直驱式风电机组并网控制

Grid-connected control of direct-driven permanent magnet wind turbine based on dual compensation droop and multiple quasi-proportional-resonances

为了实现直驱式永磁风力发电系统安全稳定并网,提出一种基于双补偿下垂与多重准比例谐振(multiple quasi proportional resonance,MQPR)相结合的并网控制策略。该策略源于传统下垂控制,在电压控制环节引入直流电压补偿量,能快速调节直流母线电压达到稳定;在电流控制环节引入电容电流补偿量,能有效减小滤波电容造成的电流误差影响;同时,设计出MQPR控制器替代内环电流的PI控制器,可以滤除系统中多次谐波电流。通过建立仿真模型,与双闭环PI和传统下垂控制策略进行对比,验证所提控制策略的有效性。

To achieve safe and stable grid connection of the direct-driven permanent magnet wind power generation system,a grid-connection control strategy combining dual compensation droop with multiple quasi-proportional-resonances(MQPR)is proposed.This strategy originates from traditional droop control,introduces DC voltage compensation in the voltage control loop to quickly adjust and stabilize the DC bus voltage,and introduces capacitive current compensation in the current control loop to effectively reduce the impact of current errors caused by filter capacitors.Meanwhile,a MQPR controller is designed to replace the PI controller of the inner-loop current,which can filter out multiple harmonic currents in the system.By establishing a simulation model and comparing it with the double closed-loop PI and traditional droop control strategies,the effectiveness of the proposed control strategy is verified.