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针对目前软件锁相环技术存在锁相误差及滤波延时的不足,笔者基于瞬时无功理论的单相锁相环技术,提出一种通过二阶广义积分器来构造正交信号的方法。并对输入电压存在直流分量的情况下,分析了正交电压分量输出的偏移情况,设计一个前馈低通滤波器后,性能有了明显的改善。最后通过在PSCAD/EMTDC中单相可控并联无功补偿(TCPC)系统仿真的基础上验证了该方案可以有效提高锁相精度并对电压畸变有较强的抑制作用,因此适用于实际的单相系统。
In order to overcome the shortcomings of phase-locked loop (PLL) and filter delay, the author proposes a method of constructing quadrature signal by using second-order generalized integrator based on single-phase PLL technology of instantaneous reactive power theory. When the input voltage has a direct current component, the output offset of the quadrature voltage component is analyzed. After a feedforward low-pass filter is designed, the performance is obviously improved. Finally, based on the single-phase controllable parallel reactive power compensation (TCPC) system simulation in PSCAD / EMTDC, this scheme is proved to be effective in improving phase-locking accuracy and strong suppression of voltage distortion. Therefore, it is suitable for the actual single Phase system.