Starting method of energy storage system comprising internal power supply cascade type power module

Abstract

The invention discloses a method for starting an energy storage system comprising an internal power supply cascade type power module, which comprises the following steps of: judging whether a power grid is normally operated or not, if the power grid is normally operated, closing a switch, and charging a direct current bus capacitor by an alternating current end of a bidirectional conversion device; when the direct-current bus capacitor is charged until the voltage at the two ends reaches a numerical value I, the first soft start switch is closed, and the energy storage battery device continues to charge the direct-current bus capacitor; when the voltage at the two ends of the direct-current bus capacitor is charged to reach a numerical value 2, the second soft start switch is closed, and the voltage at the two ends of the direct-current bus capacitor is increased to be the same as the voltage at the power end of the energy storage battery device. The method can flexibly select the starting mode of the energy storage system according to the states of the power grid and the battery, can be suitable for various use conditions of the energy storage system, and effectively solves the problem of black start in the power grid.

Description

technical field [0001] The invention relates to the technical field of energy storage system control, in particular to a start-up method of an energy storage system including an internal power supply cascade type power module. Background technique [0002] With the diversified and clean development of the world's energy structure, the country is building a new advanced power system with wind energy, photovoltaic and other new energy as the main body, actively developing "new energy + energy storage", integration of source, network, load and storage and Multi-energy complements each other, and vigorously supports the rational allocation of energy storage systems for distributed new energy sources. [0003] With the development of the country's new energy layout, with the support of policies for clean energy loads, more and more heavy-duty power equipment, such as high-speed railways, electric vehicles, etc., are integrated into the power grid as loads. Such loads have the cha...

AI Technical Summary

Problems solved by technology

[0004] The start-up control of the energy storage system in the prior art is performed through an external power supply, and it is impossible to accurately and flexibly select the start-up mode of the energy storage system, resulting in the inability to better use the energy storage system in complex working conditions. If the power grid fails to work normally, black start cannot be performed through the energy storage system

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