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发明公开
CN101820281A 基于双park变换鉴相器的单相锁相环及其实现方法 失效 - 权利终止

基于双park变换鉴相器的单相锁相环及其实现方法
摘要：
本发明公开了一种基于双park变换鉴相器的单相锁相环及其方法，该双park变换鉴相器包括第一park、第二park、第一低通滤波器LPF1和第二低通滤波LPF2，第一park和第二park的d轴同时与第一加法器M1输入连接，第一park和第二park的q轴同时与第二加法器M2输入连接；第一低通滤波器LPF1输入端与第一加法器M1输出连接，输出端与第二park的输入连接；第二低通滤波LPF2输入端与第二加法器M2输出连接，输出端与第二park的输入连接；PI控制器的输入端连接在第二低通滤波LPF2输入端；PI控制器的输出端与压控振荡器(VCO)连接。本发明的锁相环不仅可以在电网相位变化时准确跟踪电网相位，而且可以在电网频率波动时迅速、准确跟踪电网相位。
摘要（英）：

The invention discloses a single-phase phase locked loop based on a double-park transformation phase discriminator and a method thereof. The double-park transformation phase discriminator comprises a first park, a second park, a first LPF1 (Low Pass Filter) and a second LPF2, wherein the d shafts of the first park and the second park are simultaneously connected with the input of a first summator M1, and the q shafts of the first park and the second park are simultaneously connected with the input of a second summator M2; the input end of the first LPF1 is connected wit the output of the first summator M1, and the output end is connected with the input of the second park; the input end of the second LPF2 is connected with the second summator M2 and the output end is connected with the input of the second park; the input end of a controller PI is connected with the input end of the second LPF2; and the output end of the controller PI is connected with a VCO (Voltage-Controlled Oscillator). The phase locked loop not only can accurately track the power grid phase when the power grid phase changes, but also can quickly and accurately track the power grid phase when the power grid frequency fluctuates.

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