Diode clamp type five-level photovoltaic inverter and power supply system using the same

Abstract

The invention discloses a diode clamp type five-level photovoltaic inverter and a power supply system using the same, belonging to the technical field of the solar photovoltaic power generation. The direct current output from a solar photovoltaic battery is inverted into the alternative current and output to the inverter of an electric network, each path of the direct current input is subjected to independent maximum power point tracking control by a booster circuit, the efficiency of a solar panel is completely exerted, the direct current is then high effectively inverted by the multi-level inverter, the power generation efficiency of the whole system is high, harmonic wave injected into the electric network is small and the influence on the electric energy quality of the electric network is reduced. An inversion main circuit is connected with an inversion controller. The inversion main circuit comprises a direct current bus bar and three bridge arms in a same structure, a direct current input end of each bridge arm is connected with the direct current input and an alternative current output end of each bridge arm is connected with the electric network. The inverter topology has the following features: the switch stress dv / dt born on a switch device is small, the dynamic voltage sharing problem is not present and the static voltage balance can be realized without extra devices.

Description

technical field [0001] The invention relates to an inverter for solar photovoltaic power generation, in particular to a diode-clamped five-level photovoltaic inverter and a power supply system using it. Background technique [0002] With the increasing seriousness of energy and environmental problems, the power generation of renewable energy such as solar energy and wind energy is growing rapidly, and the requirements for large-capacity power conversion devices are also increasing. The core component is a high-power inverter. Due to the limitation of the device's ability to withstand voltage and current, it is difficult for traditional two-level inverters to directly realize high-voltage and high-power applications; at the same time, in high-voltage applications, the dv / dt of the output voltage of two-level inverters is very large, which will lead to insulation problems and severe electromagnetic interference. Contents of the invention [0003] The purpose of the present ...

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Problems solved by technology

Due to the limitation of the device's ability to withstand voltage and current, it is difficult for traditional two-level inverters to directly realize high-voltage and high-power applications; at the same time, in high-voltage applications, the dv / dt of the output voltage of two-level inverters is very large, which will lead to insulation problems and severe EMI

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