System and method for controlling air cooling device to start and stop in outdoor converter valve cooling system of converter station

Abstract

The invention discloses a system for controlling an air cooling device to start and stop in an outdoor converter valve cooling system of a converter station. The control device of the system is used for controlling the air cooling device to start and stop. The air cooling device of the system is used for cooling the converter unit of the converter station. The data processing device of the system is used for detecting the valve inlet temperature of the converter unit in the converter station and outputting the preset first starting signal to the first frequency converting device of the control device in case that the generated temperature value is judged to be higher than the first preset value and lower than the second preset value. The data processing device is further used for detecting the working frequency of the running first frequency converting device and outputting the preset second starting signal to the second frequency converting device of the control device in case that the re-generated temperature value is judged to be more than the second preset value and the generated frequency value is equal to the third preset value. A method for controlling the air cooling device to start and stop in the outdoor converter valve cooling system of the converter station is further provided by the invention.

Description

Technical field: [0001] The invention relates to the field of automatic control of a converter station, in particular to a system and method for starting and stopping valve cooling of a converter station by external air cooling. Background technique: [0002] In the converter station, the outdoor heat exchange equipment is an essential part of the converter valve cooling system. It uses the heat from the internal cooling system to dissipate heat through the heat exchange tube bundle in the air cooler, and the heat is dissipated by the heat exchange The cooling air on the other side of the heat pipe bundle is taken away to realize heat dissipation. [0003] The existing valve-cooled external air-cooled start-stop system of the converter station is generally equipped with 24 fans, which are controlled by 12 frequency converters, that is, one frequency converter controls two fans. All the fans are divided into three groups, each group is composed of 8 fans, when the inlet valv...

AI Technical Summary

Problems solved by technology

[0004] However, when the outdoor temperature is low, such as around -20°C, and the DC power of the converter device is running at low DC power, for example, the power is 1400 MW, the start-up and shutdown of the fan cooling system for the valve cooling of the converter station are very frequent. , on average every 5-8 minutes to start and stop a group of fans, so that the internal cooling system expansion tank liquid level, inlet valve pressure, return water pressure and other parameters change drastically, causing the monitoring system to report "low return water pressure" and other alarms, and generate a large number of Fan start and stop messages cause great inconvenience to the stable operation and operation monitoring of the system

Images