Circuit with active power decoupling single-phase no-voltage switch inverter and modulation method thereof

Abstract

The invention discloses a circuit with an active power decoupling single-phase no-voltage switch inverter and a modulation method thereof. The circuit comprises a direct-current power supply, three groups of bridge arms, a filter inductor of the inverter and a power grid, a filter inductor and an energy-storage capacitor decoupled by active power, an auxiliary switch comprising an anti-parallel diode connected between the direct-current power supply and a bus of the three groups of bridge arms, a resonance branch circuit consisting of a clamping resistor and a resonance inductor, and a capacitor, wherein the three groups of bridge arms comprise two groups of full-bridge single-phase inverters and an active power decoupling group, and each group of bridge arms is composed of two full control type switches with anti-parallel diodes; and the main switch is connected with two ends of the auxiliary switch in parallel. According to the modulation method, pulse signals of the auxiliary switchand the main switch are synchronized, no-voltage switching-on of all switches can be realized in each switching period, the reverse recovery current of the anti-parallel diode of the main switch is effectively inhibited, the switching loss is little, the circuit efficiency is high, the switching efficiency is improved, and the system power density is improved.

Description

technical field [0001] The invention relates to a soft switching inverter and its modulation technology, in particular to a single-phase zero-voltage switching inverter circuit with active power decoupling and its modulation method Background technique [0002] Active power decoupling can suppress the double grid frequency harmonic component existing in the DC side of the grid-connected inverter system. Among them, the traditional buck-type active power decoupling inverter includes two sets of bridge arms of the full-bridge inverter and a set of active power decoupling bridge arms. It works in a hard switching state, and there is a phenomenon of diode reverse recovery. The switching loss of the converter device is large, which limits the increase of the operating frequency, resulting in the need to use a larger filter and reducing the circuit efficiency. Contents of the invention [0003] The purpose of the present invention is to provide a single-phase zero-voltage switc...

AI Technical Summary

Problems solved by technology

Among them, the traditional buck-type active power decoupling inverter includes two sets of bridge arms of the full-bridge inverter and a set of active power decoupling bridge arms. It works in a hard switching state, and there is a phenomenon of diode reverse recovery. The switching loss of the converter device is large, which limits the increase of the operating frequency, resulting in the need to use a larger filter and reducing the circuit efficiency

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