微电网并网后火电机组机炉温度恒定控制方法探讨

Discussion on constant temperature control method for boiler and turbine of thermal power unit after microgrid connection

微电网并网后会使电网火电机组机炉温度受到负荷变化干扰出现波动,从而影响微电网的安全运行。为有效控制微电网并网后的火电机组机炉温度,提出微电网并网后火电机组机炉温度恒定控制方法。分析了影响火电机组机炉温度控制的相关影响因素,并根据分析结果建立了影响因素扰动下的温度控制对象模型,确定控制器设计过程的相关初始参数;基于确定的参数,结合牛顿力学控制原理完成温度恒定控制器的设计,在已知温度变量阶次的前提下,实现温度的负反馈补偿处理,将被控对象温度输出轨迹控制在期望输出轨迹上,从而实现火电机组机炉温度恒定控制。测试结果表明:使用上述方法能够在较短时间内将火电机组机炉温度控制为期望恒定温度,控制性能良好。

After the microgrid was connected to the grid,the temperature of the boiler and turbine of thermal power units in the grid would fluctuate due to the load changes,thereby affecting the safe operation of the microgrid.In order to effectively control the temperature of the boiler and turbine of thermal power units after the microgrid connection,a constant temperature control method of the boiler and turbine of thermal power units after the microgrid connection was proposed.Analysis was conducted on the relevant influencing factors that affect the temperature control of the boiler and turbine of thermal power units.Based on the analysis results,a temperature control object model was established under the disturbance of influencing factors,and the relevant initial parameters during the controller design were determined.Based on the determined parameters and combined with the control principle of Newtonian mechanics,the design of a constant temperature controller was completed.Under the premise of knowing the order of temperature variables,negative feedback compensation processing of the temperature was achieved,and the temperature output trajectory of the controlled object was controlled on the expected output trajectory,thereby achieving constant temperature control of the boiler and turbine of thermal power units.The test results showed that when using the above method,the temperature of the boiler and turbine of thermal power units could be controlled to the expected constant temperature in a short period of time,and the control performance was good.