Method for detecting positive sequence, negative sequence, idle and harmonic currents of power supply system
A technology of power supply system and detection method, which is applied in the detection field, can solve the problems of cumbersome reactive and harmonic current detection methods, and achieve the effect of clear concept, simple structure and less calculation
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[0021] Such as figure 1 The schematic diagram of the method step algorithm is shown, including the three-phase current test module 2, the zero-sequence current calculation module 1, the phase-locked loop circuit 4, the three-phase static coordinate to the two-phase static coordinate transformation 5, and the voltage-oriented two-phase static coordinate to the two-phase Positive-sequence or negative-sequence synchronous rotating coordinate transformation 6, two low-pass filters 7, 8, voltage-oriented two-phase positive-sequence synchronous rotating coordinate transformation to two-phase stationary coordinate transformation 9, transformation from two-phase stationary coordinates to three-phase stationary coordinates 10 and two subtractors 3,11.
[0022] 1. Setting of positive and negative sequence space rotating current vector and dq positive sequence rotating coordinate system:
[0023] Both the three-phase four-wire and three-phase three-wire asymmetric nonlinear load circuit...
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