Inverse-excitation type single-stage inverter for interconnected photovoltaic power generation system

Abstract

The invention discloses an inverse-excitation type single-stage inverter used in an interconnected photovoltaic power generation system, including an input side circuit, an inverse-excitation transformer and an outlet side circuit, wherein, the input side circuit includes a photovoltaic array, a first filtering capacitance and a first power switch tube, which are connected to the primary side of the transformer; and the outlet side circuit includes a second to fifth power switch tube and a second filtering capacitance, which are connected to the secondary side of the transformer. The invention has the following advantages that the single-stage structure not only realizes voltage boosting inversion output, but also reduces the size, volume weight and cost of the complete machine; high-frequency electric insulation is realized; the entire circuit has no other magnetic components except the high-frequency inverse-excitation transformer, the entire circuit uses less power devices with simple structure and small spending; and the control scheme is more simple and is easy of implementing.

Description

1. Technical field [0001] The invention relates to an inverter in a power conversion device, in particular to an inverter capable of realizing single-stage step-up and inverter. 2. Background technology [0002] The application and demand of outdoor grid-connected photovoltaic power generation is becoming more and more extensive. For example, projects such as "rural biogas system" and "photovoltaic pest early warning or pest control system" in the "Siyuan Project" proposed by the state recently require the use of grid-connected photovoltaic power generation system. At present, the price of photovoltaic system is still relatively expensive. How to reduce its cost and provide poor areas with high-quality and low-cost outdoor grid-connected photovoltaic power generation systems under the premise of ensuring performance is an important task for scientific and technological workers in enterprises and colleges. topic. At present, the inverter power supply of the photovoltaic syst...

AI Technical Summary

Problems solved by technology

Compared with the single-stage structure, the two-stage structure of DC / DC straight-to-straight converter + DC / AC inverter increases the complexity of the system, increases the volume and weight of the whole machine, reduces the overall power conversion efficiency, and makes the system cost large to increase

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