Modeling of Boiler Follow Control with IMC tuning method in coal-fired power plant

Abstract

Coal-fired power plant is one of the several industries whose product are used by consumers directly. To maintain electricity production, the coal-fired power plant requires an appropriate control strategy based on real-plant. Boiler Follow Control (BFC) is one of the several control strategies for keeping electricity production. BFC is a control strategy that used to control throttle pressure based on Advanced Regulatory Control (ARC) concept. BFC strategy involving boiler and turbine that has a separate control system, but interact with each other. BFC strategy is used when there is a change of load on the generator. The error signal will be received by indicator control. The error signal becomes a parameter for the response of increasing main steam to the turbine. The first response of BFC strategy makes fluctuation on fresh steam pressure. This condition is immediately adjusted through the arrangement of the fulfillment of combustion air, coal fuel or feedwater stream. The actual response is given in the form of the percentage of a valve. In this paper has been modeled BFC strategy using Internal Model Control (IMC) tuning method and First Order Plus Dead Time (FOPDT) approach for getting good control response. IMC tuning perform good response with parameters value of IC as K c = 0.249; τ i = 1.28; τ d = 0 and parameters value of PIC as K c = 0.130; τ i = 0.473; τ d = 0. In addition, IMC tuning response in this paper also depends on the ± 5% set point test. From modeling of BFC, the simulation shows that BFC is precise control strategy to handle the changes of load on the generator.