Power frequency and variable frequency mixed working condition power station fan RB control system and control method thereof

Abstract

The invention discloses a power station fan RB control system under the working condition of power frequency conversion and mixed use. The parameter deviation generator is connected with the adjustment controller I and the adjustment controller II respectively, and the adjustment controller I and the adjustment controller II communicate with each other. connected, both the regulating controller I and the regulating controller II communicate with the control output selector, the control output selector communicates with the balance output block, and the balance output block is respectively connected with #1 fan damper actuator and #2 fan speed regulation execution The system also includes a blower operating state recognizer, which is respectively connected to the regulating controller I, regulating controller II, control output selector, alarm display and RB occurrence recognizer in communication; the RB occurrence recognition The controller and the alarm display are communicatively connected. The invention also discloses the control method of the system at the same time. It improves and optimizes the automatic control system of the unit, increases the RB success rate of the unit, and ensures the safe production and operation of the generator set.

Description

technical field [0001] The invention relates to a control system and a control method, in particular to a power station fan RB control system and a control method thereof under the working condition of power frequency conversion mixed use. Background technique [0002] Thermal power generation units occupy an important position in my country's power production. The power loss of the blower, induced draft fan, and primary fan in the power station system is relatively large. How to reduce their energy consumption is an important issue for the optimization and improvement of power station fans. With the maturity of large-scale frequency converter technology, many thermal power units have installed frequency conversion energy-saving devices for these high-energy-consuming systems during technological transformation, and transformed the original baffle throttling control mode into energy-saving frequency conversion stepless adjustment. The operation mode, on the one hand, reduces...

AI Technical Summary

Problems solved by technology

Due to the design defects of the frequency converter itself or the system, it often occurs that the frequency conversion fails to exit and switch to power frequency bypass operation. In this way, there are two fans, one power frequency operation baffle adjustment operation, the other frequency conversion speed adjustment operation, and the baffle There are two control methods, regulation and speed regulation, with different control regulation characteristics. When the unit is in normal operation, through algorithm compensation, the coexistence of the two regulation methods can be realized. However, when the unit has a sudden change in working conditions such as RB, the current control scheme is difficult to meet System Requirements

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