Phase sequence self-adaption control method of three-phase PWM rectifier
An adaptive control and rectifier technology, which is applied in the output power conversion device, the conversion of AC power input to DC power output, electrical components, etc.
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[0037] Below in conjunction with specific embodiment and accompanying drawing, the present invention is described in further detail:
[0038] Such as figure 1 Shown is the PWM rectifier topology. The three-phase voltage-type inverter is connected to the power grid through a three-phase reactor, and there is an energy storage capacitor on the DC side, and the voltage regulation and sinusoidalization of the input current are realized through the switching action of the voltage-type converter.
[0039] The implementation steps of the phase sequence adaptive control method of the three-phase PWM rectifier proposed by the present invention are as follows:
[0040] 1. Soft-lock phase adaptive algorithm such as figure 2 Shown:
[0041] a. Collect the voltage of the three-phase grid (when it is unknown whether the phase is wrong), assuming that the phase sequence flag is positive phase sequence 1.
[0042] b. Use the instantaneous reactive power coordinate transformation formula ...
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