Thermal power plant 0 class load power supply system and control method

Abstract

The invention discloses a thermal power plant 0 class load power supply system and control method. The system comprises an energy storage device, an AC uninterrupted power load low-voltage power distribution device, an AC security load low-voltage power distribution device, and a DC security load DC power distribution device. The AC uninterrupted power load low-voltage power distribution device, the AC security load low-voltage power distribution device and the DC security load DC power distribution device are internally provided with an AC uninterrupted power load bus, an AC security load busand a DC security load bus respectively. The energy storage device is connected to the AC uninterrupted power load bus, the AC security load bus and the DC security load bus through a first switch, asecond switch and a third switch. The AC uninterrupted power load bus is also connected to a first power supply for a thermal power plant power through a fourth switch, and the AC security load bus is also connected to a second power supply for the thermal power plant power through a fifth switch. The system is intensively streamlined, compared with a conventional method, fully static equipment improves the reliability of a 0 class load power supply of the thermal power plant, the power supply quality is improved, and pollutant emissions are reduced.

Description

Technical field [0001] The invention belongs to the field of power supply and distribution of thermal power generating sets, and relates to a power supply system and a control method for class O load of thermal power plants. Background technique [0002] Class O auxiliary power loads of power plants include Class OI, Class OII and Class OIII. OI category is AC non-stop power load, OII category is DC security load, OIII category is AC security load. The specific load operation characteristics and power supply requirements are as follows: [0003] OI load refers to the load that needs continuous power supply during the operation of the generator set and boiler, and during the shutdown of the generator set and boiler (including accidental shutdown), and even for a period of time after the shutdown, which is called non-stop power load; including The computer control system, thermal protection device, automatic control and adjustment device, electric actuator and communication device ...

AI Technical Summary

Problems solved by technology

[0005] In a conventional thermal power plant, a large-scale AC uninterruptible power supply system, namely UPS, is used as an OI load power supply; a 220V DC lead-acid storage battery or a nickel-hydrogen battery pack is used as an OII load power supply; a diesel generator set is used as an OIII load power supply, and the power supply type Complex; at the same time, thermal power plants have a large number of O-load power supply system equipment, complex power distribution systems and wiring lines, occupy a large space, have many auxiliary equipment, high system cost, heavy maintenance workload, and a considerable amount of gaseous environmental pollutants Emissions and noise pollution, the overall reliability of operation is average, and the power quality fluctuates greatly

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