An energy storage converter and its battery energy storage system

Abstract

The invention relates to an energy storage converter and a battery energy storage system of the energy storage converter. The energy storage converter comprises an AC / DC module, an LCL filter, a main contactor, an alternating current EMI filter, an alternating current side pre-charging circuit, a main circuit breaker, a CL filter, a direct current EMI filter, a direct current side pre-charging circuit and a direct current side circuit breaker, wherein the alternating current side of the AC / DC module is sequentially connected with the LCL filter, the main contactor, the alternating current EMI filter and the main circuit breaker, the alternating current side pre-charging circuit is connected to the two ends of the main contactor in parallel, the direct current side of the AC / DC module is sequentially connected with the CL filter, the direct current EMI filter and the direct current side circuit breaker, and the direct current side pre-charging circuit is connected to the two ends of the direct current side circuit breaker in parallel. According to the energy storage converter and the battery energy storage system, the problem of power fluctuation in a micro-grid is solved, and the running reliability of the micro-grid is improved.

Description

technical field [0001] The invention relates to an energy storage converter and a battery energy storage system thereof. Background technique [0002] Distributed power generation technology has attracted widespread attention from the whole society due to its advantages of improving system power supply reliability, reducing end-user costs, reducing line loss, and improving power quality. Distributed power generation mainly includes various types of renewable energy power generation (wind energy, solar energy, biomass energy, etc.), and its clean and environmentally friendly features meet the requirements of low-carbon economic development. [0003] However, the connection of independent distributed generation to the grid has brought certain impacts on the grid due to its own intermittent, fluctuating, and random characteristics, which not only makes the power flow and fault mechanism characteristics of the grid more The disturbance ability is poor, and the phenomenon of aba...

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Problems solved by technology

[0008] The object of the present invention is to provide an energy storage converter and its battery energy storage system. The AC side of the energy storage converter is provided with an LCL filter, which can filter the high-frequency harmonics generated by the power grid and the converter switching Frequency high-frequency harmonic filtering, the DC side is equipped with a CL filter, which can filter out the current / voltage harmonics of the high-frequency components on the DC side, and suppress high-frequency ripples, and at the same time, EMI filtering is installed on both the DC side and the AC side filter, further filter out harmonic interference, improve the reliability of microgrid operation, and solve the problems of power fluctuation in microgrid and poor reliability of microgrid operation

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