An integrated detection system and method for on-grid and off-grid characteristics of energy storage converters

Abstract

The present invention relates to an integrated detection system and method for grid-connected and off-grid characteristics of an energy storage converter. The method includes: a grid-connected converter unit and a simulated converter unit. The grid-connected converter unit includes a rectifier module and an LCL filter The AC side of the rectifier module is connected to the power grid through the LCL filter, the DC side is connected to the DC side of the analog converter unit, and the AC side of the analog converter unit is connected to the measured energy storage converter; the present invention The technical solution provided proposes the topology of the integrated detection system for the on-grid / off-grid characteristics of the energy storage converter to improve the effectiveness of the detection system of the energy storage converter and the fit of the simulated power grid.

Description

technical field [0001] The invention relates to the technical field of variable current control, in particular to an integrated detection system and method for the characteristics of an energy storage converter and off-grid. Background technique [0002] As the penetration rate of renewable energy grid-connected power generation systems in the power system continues to increase, especially the random characteristics of new energy sources such as photovoltaics and wind power, the two-way flow of distribution network power caused by distributed power generation, and the rationality of distributed power generation in power systems Factors such as configuration and layout have led to an exponential increase in the complexity of power system design. How to improve the ability of the power system to accommodate large-scale renewable energy generation has attracted widespread attention. Energy storage can be used as both a power generation unit and a load unit, and its flexible bid...

AI Technical Summary

Problems solved by technology

Distributed power generation changes the equivalent impedance, power flow and network equivalent topology of the distribution network. In the case of distributed power generation with high penetration rate, as the number of grid-connected nodes increases, the grid impedance will lead to distributed grid-connected The resonant peak of the output filter in the converter shifts to low frequency, which may be excited by the nonlinear current source load harmonics in the distribution network and the background harmonics of the grid, thus affecting the power quality and stable operation of the distribution network

However, none of the existing grid simulator solutions can effectively simulate the grid impedance. In addition, the existing detection platform of the distributed generation system cannot detect the off-grid characteristics of the energy storage converter.

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