Control method suitable for non-isolated single-phase photovoltaic grid inverter circuit

Abstract

The invention belongs to the technical field of electric control, particularly relates to a control method suitable for a non-isolated single-phase photovoltaic grid inverter circuit, and aims at providing the control method suitable for the non-isolated single-phase photovoltaic grid inverter circuit, so as to improve the efficiency of a topological inverter with six switch tubes and reduce common-mode interference caused by on / off of the switch tubes in the circuit. In order to achieve the purposes, the technical scheme provided by the invention is that the control method suitable for the non-isolated single-phase photovoltaic grid inverter circuit comprises the steps of distinguishing control sequences of a first switch tube S1 and a sixth switch tube S6, and distinguishing the control sequences of a third switch tube S3 and a fourth switch tube S4. According to the control method, the realization is simple and convenient, the topological structure does not need to be changed, switch losses of the switch tubes are reduced, and the common-mode interference is reduced, so that the efficiency of the inverters is improved.

Description

technical field [0001] The invention belongs to the technical field of electrical control, and in particular relates to a control method suitable for a non-isolated single-phase photovoltaic grid-connected inverter circuit. Background technique [0002] The circuit topology of the existing non-isolated photovoltaic single-phase full-bridge inverter with six switching tubes, including the first switching tube S 1 , the second switch tube S 2 , the third switch tube S 3 , the fourth switch tube S 4 , the fifth switch tube S 5 , the sixth switch tube S 6 , the first diode D 1 , the second diode D 2 , the first inductance L 1 , the second inductance L 2 . The first switch tube S 1 The drain and the fourth switching tube S 4 The drain is connected to the anode of the photovoltaic array, the first switching tube S 1 source and the second switch S 2 The drain connection of the second switching tube S 2 The source and the third switch S 3 The drain connection of the t...

AI Technical Summary

Problems solved by technology

[0004] This six-switch topology control method is to improve the efficiency of the inverter. The six switch tubes used are all IGBTs or MOSFETs. In this control mode, when the switch tube S 1 , S 6 When turning on and off at the same time, a large switching loss will be generated on the two switching tubes, and the resulting common-mode interference d i / d t larger; similarly in S 3 , S 4 At the same time, large switching loss and interference will be generated when turning on and off

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