Compensating current detection method based on instant space voltage vector orientation
A space voltage vector, compensation current technology, applied in the direction of reactive power/actual component measurement, etc., can solve the problem that PLL is difficult to accurately lock equals
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Embodiment 1
[0076] like Figure 4 The application of a compensation current detection method based on instantaneous space voltage vector orientation in a three-phase three-wire system.
[0077] Let the instantaneous values of the three-phase voltage and current in the three-phase circuit be e, respectively a , e b , e c and i a , i b , i c . First, the three-phase instantaneous voltage e a , e b , e c Perform three-phase to two-phase coordinate transformation to obtain e α , e β , passing e in the αβ coordinate system α , e β Calculate the phase angle θ of the three-phase composite rotating voltage vector e e Corresponding sinusoidal signal sinθ e and cosine signal cosθ e , and use it as the orientation basis of the synchronous rotating coordinate system to transform the three-phase current coordinate to obtain i α , i β .
[0078] e α ...
Embodiment 2
[0100] like Figure 5 As shown, the application of the method described in Embodiment 1 in a single-phase system:
[0101] For a single-phase system, the single-phase voltage and single-phase current can be regarded as the A-phase voltage and A-phase current in the three-phase circuit. In order to meet the requirements of the present invention i p -i q The use conditions of the compensation current detection method are to construct the B and C phase voltages and currents according to the principle of three-phase symmetry, and then process the A, B, C three-phase voltages and three-phase currents according to the conventional algorithm, and the calculated A-phase current detection The result is the detection result corresponding to the single-phase circuit.
[0102] remember e s and i s are the instantaneous values of voltage and current of a single-phase circuit, respectively, and are denoted by e s and i s Construct a three-phase system and set e a , e b , e c and ...
Embodiment 3
[0113] like Image 6 As shown, the application of the method described in Embodiment 1 in a three-phase four-wire system:
[0114] Compared with the three-phase three-wire system, the zero-sequence current component should be dealt with correspondingly in the command current detection of the three-phase four-wire system. Referring to the processing idea of the traditional dq0 method, the zero axis perpendicular to the coordinate plane is added to the αβ coordinate system and the dq coordinate system respectively, and the coordinate transformation operation process is adjusted accordingly.
[0115] The operation method of transforming the abc coordinate system to the αβ0 coordinate system is as follows:
[0116] i α i β i ...
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