A Method for Lubricating Oil Temperature Control of Large Condenser Condenser Suppressing Intermittent Internal Disturbance

Abstract

A method for controlling the lubricating oil temperature of a large-scale condenser that suppresses intermittent internal disturbances, comprising the following steps: adding the set value SP of the lubricating oil temperature to the correction amount △SP of the set value by starting and stopping the cooling fan to obtain Obtain the calculated value A; subtract the above calculated value A from the lubricating oil temperature process value PV to obtain the temperature deviation signal Δt; input Δt into the PID controller, and calculate the calculation output u based on the control parameters; output the PID calculation The amount u acts on the lubricating oil temperature regulating valve. The control method of the present invention enables the lubricating oil temperature regulating valve to respond to the influence of the internal heat production change of the condenser on the lubricating oil temperature, and to perform continuous deviation adjustment, and can quickly respond to the external cooling water caused by the large water vapor phase change and heat absorption caused by the start and stop of the fan. The drastic temperature change ensures that the lubricating oil temperature maintains a high control accuracy, suppresses internal disturbances in the system, and improves the operation stability of the condenser. And can reduce the frequent action of the lubricating oil temperature regulating valve, prolong the service life of the lubricating oil temperature regulating valve.

Description

technical field [0001] The invention belongs to the technical field of thermal automatic control, and relates to a technology for controlling the temperature of lubricating oil in a condenser, in particular to a method for controlling the temperature of lubricating oil in a large condenser that suppresses intermittent internal disturbances. Background technique [0002] In recent years, UHV transmission systems have caused changes in grid characteristics. Due to the slow response speed of conventional electric power and electronic equipment, it cannot quickly provide sufficient reactive power support for the system during a fault, resulting in a decrease in system voltage stability. The inherent reactive power output characteristics of the condenser can just make up for this shortcoming. Therefore, the condenser was reactivated in the era of "big power grid". The conventional control strategy of the condenser system requires professional operation and maintenance teams and ...

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Problems solved by technology

[0004] When the condenser operates in high temperature weather in summer, the temperature of the external cooling water will most likely enter the range of 30-35°C, and the conventional control method will face internal disturbances caused by large-frequency fan start-up and stop, which is not conducive to the stable control of lubricating oil temperature

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