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在并网逆变系统中,必须能够准确、快速地检测出电网电压正序分量的相位信息,以便实现单位功率因数并网,然而,传统锁相环技术存在电网电压发生不对称故障时,其检测精度受到负序电压分量的影响而导致检测不准。提出一种基于相序解耦谐振(sequence-decoupled resonant,SDR)控制器的锁相环检测技术,该方法利用SDR控制器将正序电压分量从不对称电压中分离出来并对其进行相位跟踪,从而实现锁相环功能。仿真与实验结果表明,该方法在电网电压不对称、频率变化及电网畸变情况下,能对电网基波正序电压相位进行良好的检测。
In the grid-connected inverter system, the phase information of the positive sequence component of the grid voltage must be detected accurately and quickly in order to realize the unit power factor grid connection. However, when the traditional phase-locked loop technology has the asymmetrical fault of the grid voltage, The detection accuracy is affected by the negative sequence voltage component and the result is inaccurate detection. A phase-locked loop detection technique based on sequence-decoupled resonant (SDR) controller is proposed. This method uses the SDR controller to separate the positive-sequence voltage components from the asymmetrical voltages and phase-traverse them , In order to achieve phase-locked loop function. The simulation and experimental results show that this method can detect the positive sequence voltage phase of the fundamental of the power grid under the conditions of asymmetrical grid voltage, frequency variation and grid distortion.