Control method for inhibiting influence of start-stop cooling fan on cooling water temperature of phase modifier stator

Abstract

The invention discloses a control method for inhibiting the influence of a start-stop cooling fan on the cooling water temperature of a phase modifier stator. The method comprises the following steps: adding the correction delta SP of the start-stop cooling fan on a preset value to the preset value SP of the cooling water temperature of the stator, and obtaining a calculated value A; subtracting the calculated value A from the stator cooling water process value PV to obtain a temperature deviation signal delta t; inputting the delta t into a PID controller, and enabling the PID controller to calculate PID operation output quantity u based on preset control parameters; and enabling the PID operation output quantity u to act on a stator cooling water temperature adjusting valve, and adjusting the water inlet temperature of stator coil cooling water. The control method provided by the invention can ensure that the stator cooling water temperature maintains high control precision, inhibit system internal disturbance, improve the operation stability of the phase modifier, reduce frequent actions of the temperature reducing water regulating valve and prolong the service life of the temperature regulating valve.

Description

technical field [0001] The invention belongs to the technical field of thermal automatic control, in particular to a control method for suppressing the influence of starting and stopping of a cooling fan on the temperature of cooling water of a stator of a condenser. 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 more human resources, while the power grid has relatively insufficient tech...

AI Technical Summary

Problems solved by technology

The above oscillation is unstable from the point of view of automatic quality, which increases the probability of failure of the regulating valve, and also has an adverse effect on the life of the stator coil of the condenser

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