Department of Electrical Engineering, Faculty of Engineering, University of Isfahan, Hezar-Jerib St., P. code: 8174673441, Isfahan, Iran.
ISA Trans. 2014 Mar;53(2):415-22. doi: 10.1016/j.isatra.2013.09.015. Epub 2013 Oct 7.
For the participation of the steam power plants in regulating the network frequency, boilers and turbines should be co-ordinately controlled in addition to the base load productions. Lack of coordinated control over boiler-turbine may lead to instability; oscillation in producing power and boiler parameters; reduction in the reliability of the unit; and inflicting thermodynamic tension on devices. This paper proposes a boiler-turbine coordinated multivariable control system based on improved sliding mode controller (ISMC). The system controls two main boiler-turbine parameters i.e., the turbine revolution and superheated steam pressure of the boiler output. For this purpose, a comprehensive model of the system including complete and exact description of the subsystems is extracted. The parameters of this model are determined according to our case study that is the 320MW unit of Islam-Abad power plant in Isfahan/Iran. The ISMC method is simulated on the power plant and its performance is compared with the related real PI (proportional-integral) controllers which have been used in this unit. The simulation results show the capability of the proposed controller system in controlling local network frequency and superheated steam pressure in the presence of load variations and disturbances of boiler.
为了让蒸汽发电厂参与电网频率调节，除了基本负荷生产外，还应协调控制锅炉和涡轮机。锅炉-涡轮机缺乏协调控制可能导致不稳定；发电和锅炉参数的振荡；降低机组的可靠性；并对设备造成热力学张力。本文提出了一种基于改进滑模控制器（ISMC）的锅炉-涡轮机协调多变量控制系统。该系统控制两个主要的锅炉-涡轮机参数，即涡轮机转速和锅炉输出的过热蒸汽压力。为此，提取了包括子系统完整和准确描述的系统综合模型。该模型的参数根据我们的案例研究确定，即伊朗伊斯法罕伊斯兰阿巴德发电厂的 320MW 机组。在电厂上模拟了 ISMC 方法，并将其性能与该机组中使用的相关实际 PI（比例积分）控制器进行了比较。仿真结果表明，在存在负荷变化和锅炉干扰的情况下，所提出的控制器系统能够控制局部电网频率和过热蒸汽压力。
