Storage battery pack fault self-healing system and method for electric power plant station

Abstract

The invention discloses a storage battery pack fault self-healing system and method for an electric power plant station. The system comprises a valve-regulated lead-acid storage battery pack, a segmented capacity converter, a lithium battery pack, a valve-regulated lead-acid storage battery pack online monitoring device and a self-healing system control device. The valve-regulated lead-acid storage battery pack is divided into a plurality of sections, and each section comprises a plurality of valve-regulated lead-acid storage batteries; each valve-regulated lead-acid storage battery section is provided with a sectional capacity converter, and the sectional capacity converters are connected with the lithium battery pack in parallel; the lithium battery pack is connected to a direct-current bus through a step-down silicon chain; and the valve-regulated lead-acid storage battery pack online monitoring device is connected with the valve-regulated lead-acid storage battery pack. When faults such as internal open circuit of the storage batteries occur in the valve-regulated lead-acid storage battery pack, the lithium iron phosphate storage battery pack can maintain continuous power supply of a direct-current power supply, and meanwhile, the faulted storage batteries can be automatically and quickly isolated, and power supply of the remaining batteries in the valve-regulated lead-acid storage battery pack is recovered; and self-fault repair of the storage battery pack and fault healing of the direct-current power supply system are realized.

Description

technical field [0001] The invention relates to the technical field of power generation, transmission and transformation, in particular to a fault self-healing system and method for battery packs used in electric power plants. Background technique [0002] The power plant DC power supply system is responsible for the low-voltage DC power supply task of the primary and secondary equipment in the power plant, substation and converter station. It is an auxiliary system for the normal operation of the power plant and a security facility for abnormal conditions. With the expansion of the grid scale and the improvement of the operating voltage level, as well as the continuous improvement of the comprehensive automation and intelligent technology level of the power system, the DC load of power plants and stations has increased, and the types of auxiliary equipment and devices have increased, and some of them require continuous power supply. Important DC loads put forward higher req...

AI Technical Summary

Problems solved by technology

[0004] In recent years, the on-line monitoring system for valve-regulated lead-acid battery packs in power plants has been launched to monitor important parameters such as battery cell voltage, battery pack voltage, cell internal resistance, and battery internal temperature online. Once a battery is found to be abnormal or changing When it is abnormal, an alarm will be issued immediately to inform the operation and maintenance personnel to deal with it in a timely manner, but this is far from enough for the safety and reliability of power generation, transmission, distribution, and consumption.

The battery pack of the DC power supply of the power plant is composed of dozens or more than one hundred single batteries in series. If any battery fails, the entire battery pack formed in series will not be able to supply power normally. For example, in the event of a power grid accident or power plant system When the AC power supply is interrupted due to faults, etc., if a valve-regulated lead-acid battery has an internal open circuit failure, the power supply of the DC power supply of the power plant will be interrupted, which will directly cause the expansion of the accident in the power plant and even cause a chain failure of the power grid system. column of accidents

[0005] It is very difficult to predict the internal open-circuit fault of the valve-regulated lead-acid battery under the current floating charging operation mode of the power station. There is a lack of effective prevention and treatment measures, and the internal open-circuit fault of the battery occurs suddenly, making it hard to prevent. Only one provincial power company There are several open-circuit failures inside the battery in the substation under its jurisdiction every year, which has become a persistent problem that has seriously plagued maintenance personnel and management personnel for a long time

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