基于优化滑模控制的DD-PMSG并网逆变器不平衡暂态高电压故障穿越  

Unbalanced Transient High Voltage Fault Ridethrough of DDPMSG Gridconnected Inverter Based on Optimal Sliding Mode Control

作　　者：许成 周羽生[1] 周文晴 郭顺 XU Cheng;ZHOU Yusheng;ZHOU Wenqing;GUO Shun(School of Electrical and Information Engineering,Changsha University of Science and Technology,Changsha 410114,China)

机构地区：[1]长沙理工大学电气与信息工程学院,长沙410114

出　　处：《电力电容器与无功补偿》2024年第6期59-68,共10页Power Capacitor & Reactive Power Compensation

基　　金：国家自然科学基金(52177015);湖南省教育厅科学研究重点项目(19A018)。

摘　　要：为解决电网不平衡高电压易导致直驱永磁风电机组发生脱网事故的问题,提出了应用滑模控制、虚拟同步电机技术和正、负序电压电流双闭环PWM控制相结合的优化策略。通过对网侧电压电流在dq坐标系下正、负序解耦,在非对称故障下建立序分量电流和功率的关系,计算得出正、负序电流指令值,控制有功减少系统的频率波动,调节无功支撑并网点电压恢复;将电流内环输出作为电压外环部分控制量的输入,对电流内环PI控制优化成滑模控制,增强并网逆变器的稳定性。仿真实验表明优化控制方法的有效性。提高了永磁直驱风电并网系统在不平衡高电压时故障穿越能力和运行稳定性。For solving the problem that the unbalanced high voltage of the power grid easily leads to off grid accidents of directdrive permanent magnet wind turbine,the optimal strategy in combination of sliding mode control,virtual synchronous generator technology and the positive and negative sequence voltage and current double closedloop PWM control is proposed.By decoupling the positive and negative sequences of the gridside voltage and current in the dq coordinate system,the relationship between the sequential component current and power under asymmetrical faults is set up,the command values of the positive and negative sequence currents is obtained by calculation,the active power is controlled to reduce the frequency fluctuation of the system,and the reactive power is regulated to support the voltage recovery at the gridconnected point.The output of the current innerloop is taken as the input to the part of the voltage outerloop control,the innerloop PI control of the current is optimized into slidingmode control so to enhance stability of the gridconnected inverter.The simulation experiment shows the effectiveness of the optimized control method.The fault ride through ability and operation stability of the permanent magnet direct drive wind power grid connected system in case of unbalanced high voltage are improved.

关 键 词：直驱风电机组 高电压穿越 非对称故障 虚拟同步技术 滑模控制 

分 类 号：TM464[电气工程—电器]