This paper proposes a new control strategy for improving the performance of the superheated steam temperature control system in thermal power plants. Based on the analysis of the limitations of the static feedforward compensators (SFC) for temperature and boiler load disturbances in the existing control system of the auxiliary boiler in Dung Quat refinery, two adaptive dynamic feedforward compensators (ADFC) for temperature and boiler load disturbances were proposed to replace the SFCs. | Vietnam Journal of Science and Technology 56 (3) (2018) 347-356 DOI: SUPERHEATED STEAM TEMPERATURE CONTROL FOR BOILER USING ADAPTIVE DYNAMIC FEEDFORWARD COMPENSATORS Nguyen Trong Ha1, Nguyen Le Hoa2, *, Doan Quang Vinh2 1 Dung Quat oil refinery, Binh Tri commune, Binh Son district, Quang Ngai province, Vietnam The University of Danang – University of Science and Technology, 54 Nguyen Luong Bang, Da Nang City, Vietnam 2 * Email: nlhoa@ Received: 28 May 2017; Accepted for publication: 8 April 2018 Abstract. This paper proposes a new control strategy for improving the performance of the superheated steam temperature control system in thermal power plants. Based on the analysis of the limitations of the static feedforward compensators (SFC) for temperature and boiler load disturbances in the existing control system of the auxiliary boiler in Dung Quat refinery, two adaptive dynamic feedforward compensators (ADFC) for temperature and boiler load disturbances were proposed to replace the SFCs. In addition, a method for predicting the tube wall temperature of the superheater using an autoregressive moving average (ARMA) model was also proposed. The simulation results for the two typical cases of the boiler load change indicate that the control system incorporated with the proposed ADFCs improves significantly the performance of the control system. Keywords: superheated steam temperature control; thermal power plant; adaptive dynamic feedforward compensator, autoregressive moving average. Classification numbers: ; 1. INTRODUCTION Steam temperature control of a superheater is critical for the safe, reliabile and efficient operation of a power plant boiler. The desired deviation range of the outlet superheated steam temperature is generally ± 5 oC from the setpoint. Operating at temperatures outside this range can seriously affect the safety and economics of the boiler and turbine operation. Challenges in controlling .
