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To improve the noise immunity of a dq frame based open-loop phase detection (OPD) under high-frequency noise grid conditions, this paper develops a detailed model to quantitatively evaluate the phase detection error and noise immunity. It is found that the OPD behaves differently in terms of noise immunity when the dq frame is in different angle po...
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Context 1
... when noise interference occurs, the computed magnitude of the grid voltages undoubtedly contains random fluctuations. As shown in Figure 2, the actual detection phase computed by Equation (4) thus offsets the actual value, which results in an obvious phase error. In brief, the OPD based on the dq frame exhibits the advantages of rapidity and simplicity, which can detect voltage synchronous phase faster than traditional CPDs and thus ensure the highperformance operation of grid-connected inverters. ...
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