Automatic capacity checking device and capacity checking method for direct-current power supply system of transformer substation

Abstract

The invention relates to an automatic capacity checking device and a capacity checking method for a direct-current power supply system of a transformer substation, and the device consists of a storage battery pack AC / DC rectifying circuit, a DC / AC inverter circuit, a capacity checking circuit, a bidirectional buck-boost circuit, a battery management system, a communication interface and a dynamic monitoring circuit, the AC / DC rectifying circuit and the multi-path backup storage battery pack supply power to the direct current bus; and when capacity checking of discharging and charging of a storage battery pack is needed, an online capacity checking method is adopted, the discharging voltage and the charging voltage are adjusted through a bidirectional buck-boost circuit in the capacity checking circuit, a power grid is discharged through a DC / AC inverter circuit while a direct-current load is discharged, the discharging speed is increased, the AC / DC rectifying circuit is used for carrying out constant-current charging on the storage battery pack, stability of direct-current bus voltage is guaranteed in the discharging and charging process, automatic detection and remote monitoring of the charging and discharging state of the battery are achieved, human intervention is reduced, and recycling of discharging electric energy is achieved.

Description

technical field [0001] The invention relates to the field of direct current power supply of substations, in particular to a nuclear capacity device and a nuclear capacity method of a direct current power supply system of a substation. Background technique [0002] Substation DC power supply system widely serves hydraulic power, substations, thermal power plants and other users who use DC equipment. Power supply equipment. The DC power supply system is an independent power supply. It is not affected by the generator, plant power consumption and system operation mode. It can continue to provide DC power from the battery as a backup power supply when the external AC power is interrupted. [0003] The newly installed valve-regulated battery needs to be checked and discharged at full capacity during acceptance, and the full-capacity checked charge and discharge should be carried out every 6 months thereafter. After two years of operation, the valve-regulated battery should be ch...

AI Technical Summary

Problems solved by technology

[0006] When the existing technology is used for off-line nuclear capacity, manpower is required to participate in the system’s nuclear capacity work, which requires a lot of personnel investment; in order to speed up the nuclear capacity, external equipment such as resistance boxes must be used to consume the discharge energy. Although the discharge current increases, the energy is wasted. Many; if online nuclear capacity is adopted, since the load power of the substation’s daily use equipment is small, the maximum discharge current will not exceed the load current, so the discharge current is small and the discharge time is long, and the stability of the DC bus voltage during the nuclear capacity process cannot be guaranteed. Thus affecting the normal operation of the load equipment

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