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针对三相四线制三桥臂双电容式SVG补偿精度问题,对其模型进行分析。提出了一种自适应性加强型锁相环(enhanced phase-lockloop,简称EPLL),其相位跟踪不受电压不平衡和闪变的影响,鲁棒性好,精度高。针对传统LCL滤波器存在的谐振峰,功率损耗大和滤波效率低等缺点,设计一种RC串联的LCL滤波方法应用于三相四线制三桥臂双电容式SVG。通过建立基于RC串联的LCL的系统模型,构建系统传递函数并利用系统传函等效原则,设计滤波参数。仿真与实验表明:RC串联的LCL滤波器能够较好地抑制开关频率谐波,且高频纹波抑制效果好;自适应性加强型锁相环,可以在保证响应速度的同时提高电流跟踪精度。
Aimed at the precision of three-phase four-wire tri-arm dual-capacitor SVG compensation, the model is analyzed. An enhanced phase-lockloop (EPLL) is proposed. Its phase tracking is not affected by voltage unbalance and flicker, so it has good robustness and high precision. Aiming at the shortcomings of the traditional LCL filter, such as resonant peak, large power loss and low filtering efficiency, an LC series LCL filter is designed for three-phase four-wire three-leg dual-capacitor SVG. By establishing a system model of LCL based on RC series connection, the system transfer function is constructed and the equivalent parameters of the system transfer function are used to design the filter parameters. The simulation and experiment show that the RC series LCL filter can restrain the switching frequency harmonics well and the high-frequency ripple suppression effect is good. The self-adaptive reinforced phase-locked loop can improve the current tracking accuracy while ensuring the response speed .