Prompt and accurate phase detection is an essential qualification for the control of grid-connected inverters. However, the commonly used phase-locked loop methods consume too much time, longer than one grid period, to lock the new phase under severe grid unbalance condition, resulting in failing to satisfy the need for high speed and accuracy of phase synchronization. In order to solve this problem, an open-loop phase locking scheme was proposed in this paper. By constructing virtual orthogonal signals and...
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