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Black start method of energy storage system and energy storage system

An energy storage system and black start technology, applied in the field of energy storage systems, can solve problems such as damage to batteries and electrical equipment, large capacity requirements of household energy storage systems, and excessive loop current, and achieve the effect of avoiding excessive loop current

Pending Publication Date: 2022-04-12
HANGZHOU BMSER TECH
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  • Abstract
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AI Technical Summary

Problems solved by technology

[0004] The household energy storage system requires a large capacity, and generally requires multiple battery clusters to be connected in parallel. If there is a voltage difference between the battery clusters, after a black start is triggered, when the BMS of each battery cluster actively closes the main circuit relay, the battery cluster with high voltage will be disconnected. Charge the battery clusters with low voltage. In this charging circuit, the equivalent resistance is milliohm level, and the voltage difference between the battery packs of each cluster may reach tens of volts, resulting in excessive loop current, even far beyond the system's tolerance. Current capacity, damage batteries and electrical equipment, causing serious safety accidents

Method used

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  • Black start method of energy storage system and energy storage system
  • Black start method of energy storage system and energy storage system
  • Black start method of energy storage system and energy storage system

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Embodiment Construction

[0019] Preferred embodiments of the present invention will be described in detail below with reference to the accompanying drawings, but the present invention is not limited to these embodiments. The present invention covers any alternatives, modifications, equivalent methods and schemes made within the spirit and scope of the present invention.

[0020] In order to provide the public with a thorough understanding of the present invention, specific details are set forth in the following preferred embodiments of the present invention, but those skilled in the art can fully understand the present invention without the description of these details.

[0021] In the following paragraphs the invention is described more specifically by way of example with reference to the accompanying drawings. It should be noted that all the drawings are in simplified form and use inaccurate scales, which are only used to facilitate and clearly assist the purpose of illustrating the embodiments of t...

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Abstract

The invention provides a black-start method of an energy storage system and the energy storage system, and the method comprises the steps: presetting the address number of each battery management system, setting one battery management system as a host, and enabling the other battery management systems to serve as slaves; after each battery management system is powered on, each battery management system sends an address number frame message of the battery management system; the host detects the address number frame message, and if any address number frame message is not detected, the host controls the corresponding control switch to be switched on; and if the address number frame message is detected, the host appoints one battery management system to control the corresponding control switch to be closed. The problem of backflow caused by simultaneous power supply of the multi-cluster parallel battery pack is solved, and electrical equipment is prevented from being damaged due to overlarge loop current.

Description

technical field [0001] The invention relates to the field of energy storage, in particular to a black start method of an energy storage system and the energy storage system. Background technique [0002] Household energy storage systems are usually composed of battery packs, BMS (Battery Management System), PCS (Energy Storage Inverter), photovoltaic modules or AC mains, etc. Send the command, and the BMS controls the battery main circuit relay to close, so as to realize the charging of the battery by photovoltaic or mains power, and the discharge of the battery to the household load. [0003] In the off-grid state without photovoltaic and mains power, the PCS has no power supply and cannot start to work, so it cannot use the battery to supply power to household loads. At this time, a black start operation is required to let the BMS control the battery main circuit relay to close, and the battery voltage The output supplies power to the PCS so that the entire energy storage...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02J3/32H02J3/38H02J7/00H02J7/02
CPCY02E10/56Y02E70/30
Inventor 蒋浩靳银刚王政
Owner HANGZHOU BMSER TECH
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