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Equalizing current control method for H-bridge cascaded energy-storing system

A technology of energy storage system and balancing current, which is applied in the direction of collectors, electric vehicles, electrical components, etc., can solve the problems of utilization rate and life difference restriction, etc., to improve utilization rate and service life, easy to implement, and simple control method Effect

Inactive Publication Date: 2015-09-09
北京亿利智慧能源科技有限公司
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Problems solved by technology

[0004] Aiming at the problem that the utilization rate and life of the battery pack in the battery energy storage system are restricted by the difference between the single batteries, the purpose of the present invention is to provide a balanced current control method for the H-bridge cascaded energy storage system, through the H-bridge level In the federated energy storage system, the amplitude of the modulation wave of each sub-module is distributed in proportion to control the charge and discharge current of the energy storage battery in a balanced manner, so as to improve the utilization rate and service life of the battery

Method used

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  • Equalizing current control method for H-bridge cascaded energy-storing system

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Embodiment Construction

[0022] The present invention will be further described in detail below in conjunction with the accompanying drawings and examples. The following examples are explanations of the present invention and the present invention is not limited to the following examples.

[0023] like figure 1 , each phase of this circuit topology is formed by cascading n identical sub-modules, and each sub-module is composed of an energy storage battery, a absorbing capacitor and an H-bridge inverter. The end adopts star connection, and each phase is connected to the three-phase power frequency grid through connecting inductors.

[0024] In the present invention, the H-bridge cascaded battery energy storage system adopts a carrier phase-shift modulation strategy for SPWM control. The basic idea of ​​the carrier phase-shift modulation method is that n series inverter units all adopt low switching frequency SPWM, have the same frequency modulation ratio k and the same amplitude modulation ratio m, and...

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Abstract

The invention provides an equalizing current control method for an H-bridge cascaded energy-storing system and belongs to the technical field of battery energy storage. The H-bridge cascaded energy-storing system employs carrier phase-shifting modulation. All sub modules use successively-shifted triangular carriers and respective modulating waves. According to the state of charges (SOC) of batteries measured by a battery management system (BMS), the optimum charging current of the batteries is acquired and respective given power instructions are acquired. Finally, the given modulating wave amplitudes of the sub modules are allocated according to the proportions of the power instructions to a total power instruction, thereby controlling the current of the battery pack in an equalized manner. The equalizing current control method prevents overcharging and over-discharging of the battery pack, improves the utilization rates of the batteries, and prolongs the service lives of the batteries.

Description

technical field [0001] The invention belongs to the technical field of battery energy storage, in particular to a balanced current control method for an H-bridge cascaded energy storage system. Background technique [0002] With the development of smart grid, a large amount of renewable energy has been integrated into the grid. However, due to the randomness and instability of renewable energy, an energy storage device with a certain capacity is often added to the AC grid or DC grid system to stabilize the power fluctuations caused by the access of renewable energy to the grid and improve the reliability of power supply. The purpose of improving power quality. A battery energy storage system generally consists of two parts: an energy storage battery and a high-power energy storage power conversion system (PCS). Traditional battery modules generally connect battery cells directly in series and parallel, and then add a simple equalization and protection circuit to cut off th...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02J7/00
Inventor 牛利勇梁晖黄彧龚敏明
Owner 北京亿利智慧能源科技有限公司
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