The necessity of using generation unit integral model to design boiler pressure controller for emergency conditions of power system is analyzed and based on it an improved energy balance control strategy is proposed. It is pointed out that the generator rotor possesses energy storage characteristic as steam drum. Compared with the traditional simplified model(boiler-turbine model) of generation unit,the integral model,which takes into account the generator rotor dynamic characteristic,can more accurately describe the energy balance situation during the emergency conditions of power system. The improved energy balance control strategy is based on the analysis of generator unit energy balance between input and output. The simulative results indicate that,compared with the direct energy balance control strategy based on the simplified model, the improved energy balance control strategy based on the integral model more concretely reflects the dynamic balance of energy supply and demand among components of generation unit,effectively speeds up the dynamic response of boiler and improves the dynamic performance of main steam pressure.%分析了在电力系统紧急状态下,基于发电单元整体模型设计锅炉主汽压力控制器的必要性,并提出了基于该模型的改进能量平衡控制方法.指出与锅炉汽包一样,发电机转子也具有储能特性;和传统发电单元简化模型(机炉模型)相比,在电力系统紧急状态下,考虑发电机转子动态特性的发电单元整体模型,更能够精确描述复杂运行工况下发电单元能量转化过程中的能量平衡状况.基于发电单元整体模型,从能量输入和输出之间平衡状况的角度,提出了改进能量平衡控制方法.仿真结果表明,和基于传统发电单元简化模型(机炉模型)的直接能量控制方法相比,所提出的基于发电单元整体模型的改进能量平衡控制方法,更加具体反映了发电单元内部元件之间能量供求的动态平衡状况,有效加快了锅炉动态响应速度,改善了锅炉主汽压力的动态性能.
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