A three-phase grid-connected power inverter module suitable for photovoltaic-storage integrated power generation system

Abstract

The invention provides a three-phase grid-connected power inverter module applicable to an optical record integrated power generation system. The three-phase grid-connected power inverter module comprises a solar panel, wherein the solar panel is accessed into a power grid through a three-phase full-bridge inverter circuit; a connection point of any phase of bridge arm in the three-phase full-bridge inverter circuit passes through a storage battery power inverter unit and an electric reactor in sequence and is accessed into the power grid; the connection points of other two phases of bridge arms in the three-phase full-bridge inverter circuit respectively pass through the electric reactor and are directly connected with the power grid; and the storage battery power inverter unit comprises a storage battery which is connected to two ends of a two-phase full-bridge inverter circuit. Compared with the prior art, according to the three-phase grid-connected power inverter module applicable to the optical record integrated power generation system, grid-connected power generation and redundant electric energy storage and release can be simultaneously realized; reduction of generation power fluctuation is facilitated; the generating efficiency is improved; electric energy can be further provided to a load at night; and the three-phase grid-connected power inverter module is applied to the occasions of an independent power grid, a small power grid and the like.

Description

technical field [0001] The invention relates to a three-phase grid-connected power inverter module, in particular to a three-phase grid-connected power inverter module suitable for an optical-storage integrated power generation system. Background technique [0002] With the in-depth development of grid connection and transmission and distribution technologies of intermittent power sources such as wind energy and solar energy, battery energy storage systems have also been widely used; as a key device for the stable operation of battery energy storage systems, power conversion systems (PCS) are used In order to realize the two-way energy transfer between the DC battery of the battery energy storage system and the AC grid, the charge and discharge management of the battery system, the tracking of the load power on the grid side, the control of the charge and discharge power of the battery energy storage system, and the control of the battery energy storage system are realized th...

AI Technical Summary

Problems solved by technology

[0005] ①: The inductance included in the DC / DC module increases the volume, weight and cost of the battery energy storage system;

[0006] ②: The three-phase grid-connected PCS does not have the energy storage capacity, that is, when the photovoltaic resources are more abundant, the grid-connected PCS transmits more power to the grid; when the photovoltaic resources are scarce, the power transmitted by the grid-connected PCS to the grid decreases accordingly

Therefore, the power emitted by the grid-connected PCS has strong fluctuations, and when the grid-connected power of the grid-connected PCS is limited, the phenomenon of sacrificing power generation will occur, resulting in a large amount of energy waste

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