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- Title
基于间接能量平衡的锅炉汽温 GPC-PID 级控制.
- Authors
王爽心; 贺飞; 刘如九; 马海林
- Abstract
Due to steam temperature characteristics of great inertia, pure time-delay, non-linear and difficult to establish accurate models at power station, the conventional cascade PID controller is faced with significant shortcomings with its rapidity and accuracy of AGC’s ( Automatic generation control) load response. Based on the fundamental idea of direct energy balance ( DEB), an indirect energy balance method ( IEBM) was proposed which can construct and predict the setting values of intermediate steam temperature that varies with the load’s command. It changed the inner controller in cascade system from original servo system into a constant value system so as to indirectly achieve the control of superheated and reheated steam temperature of the boiler. The system timely predicts the delays of steam temperature varied with the influence of different loads, the intermediate steam temperature is designed as the main body of the control system which is adopted by the strategy of generalized predictive control ( GPC), and the primary loop is still controlled by PID controller. In view of above-mentioned idea, a new type of IEBM-GPCPID cascade control system was proposed by multi-model off-line identification through RBF neural network. Simulation results of the real data on site show that the proposed method can considerably improve the control effect of the steam temperature and the robustness of the control system.
- Subjects
ROBUST control; CASCADE control; SUPERHEATED steam; TEMPERATURE control; PID controllers; BOILERS; STEAM generators
- Publication
Electric Machines & Control / Dianji Yu Kongzhi Xuebao, 2016, Vol 20, Issue 9, p9
- ISSN
1007-449X
- Publication type
Article
- DOI
10.15938/j.emc.2016.09.002