Three-phase non-isolated grid connection converter and air-conditioning system

Abstract

The invention discloses a three-phase non-isolated grid connection converter and an air-conditioning system. The three-phase non-isolated grid connection converter comprises a direct current terminal, a first alternating current terminal, a second alternating current terminal, a third alternating current terminal, a first capacitor, a second capacitor, a first inductor, a second inductor, a third inductor, a first switch and a second switch, wherein the first capacitor and the second capacitor are connected between the direct current terminal and the ground in series; the first ends of the first inductor, the second inductor and the third inductor are respectively connected to the first alternating current terminal, the second alternating current terminal and the third alternating current terminal; the second ends of the three inductors are respectively connected to a first intermediate node, a second intermediate node and a third intermediate node; the third intermediate node is the intermediate node between the first capacitor and the second capacitor; the first ends of the first switch and the first switch are respectively connected to a first node and a second node; the second ends of the switches are connected to the direct current terminal; the third ends of the switches are connected to the ground; the fourth ends of the switches are connected to a third node; and the first ends of the first switch and the second switch are selectively connected to one of the second ends, the third ends and the fourth ends. Electric energy from a power grid, solar energy and a storage battery is selectively adopted by the air-conditioning system for providing electricity to a compressor of an air conditioner.

Description

technical field [0001] The present invention relates to a power supply circuit, more specifically, to a three-phase non-isolated grid-connected converter and an air-conditioning system. Background technique [0002] As an important renewable energy source, solar energy is abundant and clean, and it is an important part of the energy strategy for sustainable development of mankind. Under the background of environmental protection, how to utilize renewable energy such as solar energy and convert it into electrical energy or heat energy is one of the more popular researches in the field of air conditioning. At present, in addition to improving the photoelectric conversion efficiency, the development of high-efficiency converter structures and electric energy utilization structures is a feasible breakthrough that restricts its development. [0003] Photovoltaic air-conditioning systems use photovoltaic cells to provide part or all of the electrical energy required for air-condi...

AI Technical Summary

Problems solved by technology

[0004] The technical problem to be solved by the present invention is to provide a three-phase non-isolated grid-connected converter and an air-conditioning system to solve the problems of high system cost and low conversion efficiency caused by the use of isolation transformers in the prior art

Images