光伏并网逆变器空间电压矢量双滞环电流控制新策略

A novel double hysteresis loop current control method for three-phase PV grid-connected inverter with voltage space vector

提出了一种适用于三相光伏并网逆变器的双滞环电流控制改进算法。根据逆变器线电流与功率器件开关状态的关系,对线电流实行解耦控制,利用双滞环来判断参考空间电压矢量的位置,结合锁相环电路对输出的开关状态进行检测,构成频率闭环控制。最后利用Matlab/Simulink工具箱和3kW实验平台对双滞环控制算法进行验证。结果表明,该算法保留了传统滞环控制电流跟踪响应快、有限流能力的优点,同时也有效地克服了开关频率变化不固定、开关损耗较大等问题。

An improved algorithm of double hysteresis loop current control method for three-phase PV grid-connected inverter is proposed.The decoupling control of the line current is realized under the relationship between inverter line current and switch status of power instrument. The position of reference space voltage vector can be judged by double hysteresis loop. Output switch state can be detected by phase-locked loop circuit, thus the frequency closed-loop control is constructed.At last,the algorithm is simulated in Matlab/Simulink toolbox and verified on 3 kW experimental platform.The results show that the improved algorithm remains the fast response and limiting current capacity of traditional hysteresis current tracking control,also effectively overcomes the non-fixed switching frequency and the larger switching loss.