Method for restraining parallel-connection circulating currents of three-phase four-leg inverters on basis of third-harmonic injection
A three-phase four-bridge, sub-harmonic technology, applied in the direction of converting AC power input to DC power output, output power conversion devices, electrical components, etc., can solve problems such as aggravation of circulating current problems
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[0014] attached figure 1 It is a schematic diagram of the control strategy structure of the three-phase four-leg inverter parallel connection circulating current suppression method with third harmonic injection, and its control circuit part is mainly composed of a three-phase inductor current sharing controller (1), a neutral current reference signal generation controller ( 4), the third harmonic generator (5) (6) (7), and several main parts. Among them, the three-phase inductor current sharing controller firstly compares the fed-back three-phase output voltage with the reference voltage, and obtains the current reference signal of the three-phase current loop through the proportional integral link composed of the operational amplifier, and then obtains the three-phase current signal of each inverter module through LEM sampling. The feedback value of the phase inductance current is compared with the shared current reference signal, and the modulation signal of the first three ...
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