Single-phase loss operation control method for five-phase current source converter

Abstract

The invention discloses a single-phase loss operation control method for a five-phase current source converter, which comprises the steps of S1, carrying out component decomposition on a phase voltagevector set Vg with a rightward arrow above the letter V of the remaining four non-fault phases to obtain a phase voltage sequence component vector set V<g><+,-,00,0> with a rightward arrow above theletter V of the four non-fault phases, and outputting a reference value Pref defined as the constant active power of the converter by a PI controller; S2, calculating a line current reference value vector set ILref with a rightward arrow above the letter I of the four non-fault phases of the converter; S3, calculating a compensation current vector set Ic with a rightward arrow above the letter I of a filter capacitor according to the phase voltage sequence component vector set V<g><+,-,00,0> with a rightward arrow above the letter V of the four non-fault phases and the capacitance Cf of the filter capacitor; S4, adding the obtained line current reference value vector set ILref with a rightward arrow above the letter I and the compensation current vector set Ic with a rightward arrow abovethe letter I to obtain a modulation current reference value vector set Iwref with a rightward arrow above the letter I of the converter, and obtaining a duty cycle signal of a switch tube corresponding to the non-fault phases through SPWM (Sinusoidal Pulse Width Modulation); and S5, obtaining a duty cycle signal of the switch tube so as to control the turn-on and turn-off of the switch tube of theconverter.

Description

technical field [0001] The invention relates to a control method of a five-phase current source type converter in a five-phase independent power grid, in particular to a control method for single-phase lack of phase operation of a five-phase current source type converter. Background technique [0002] In the fields of new-type locomotive traction, mine hoisting, and ship propulsion, the demand for transmission power of drive converters continues to increase. At present, a solution with good application prospects is to use five-phase current source converters to transmit power. [0003] Compared with the traditional three-phase current source system, the five-phase current source system, as a promising solution for low-voltage and high-power applications, has the following significant advantages: [0004] (1) Using switching devices of the same power level, the five-phase current source system can realize low-voltage high-power conversion, and the voltage stress borne by eac...

AI Technical Summary

Problems solved by technology

In the case of lack of phase operation, due to the asymmetrical power supply of the converter, the traditional control method will lead to an increase in the secondary ripple of the DC bus current, an increase in the peak value of the AC side line current, and severe waveform distortion, etc.

At present, there is no relevant method for the lack of phase operation of five-phase current source converters.

Images