二阶广义积分单相电网电压锁相方法实验研究

并网型电力电子变流设备需要精确检测电网电压的相位实现同步。同步旋转坐标方法是一种针对三相电网电压优良锁相方案,基于二阶广义积分方法构造一虚拟正交信号,能将同步旋转坐标方法扩展至单相电网锁相。分析了控制流程,参数选择,以DSP F28335为控制核心的实验平台实现算法,得出电网电压幅值突变、频率突变、谐波情况下的响应结果,验证了方法的正确性。

Experi mental Research on the Phase Lock Method for Single-phase Grid Voltage Based on Second Order Generalized Integral

Synchronization of power electronic current transformers of grid connection type is realized through accurate detection of the phase of network voltage.Synchronous reference frame approach,an excellent phase lock scheme for three-phase network voltage,constructs a virtual orthogonal signal based on the second order generalized integral to extend the synchronous reference frame approach to phase lock of single-phase networks.This paper analyzes in detail the control flow and parameter selection of this approach.The algorithm is realized on an experimental platform using DSP F28335 as control core to obtain response results in the cases of magnitude saltation and frequency discontinuity of grid voltage as well as harmonic condition.The correctness of this method is thus verified.