一种面向深度调峰运行火电机组的一次调频能力建模新方法  

New Modeling for Primary Frequency Regulation Capability of Thermal Power Units Under Deep Peak Regulation

作　　者：张小科 王子杰 夏大伟 王景钢 胡怀中[2] ZHANG Xiaoke;WANG Zijie;XIA Dawei;WANG Jinggang;HU Huaizhong(Electric Power Research Institute of State Grid Henan Electric Power Company,Zhengzhou 450052,Henan Province,China;School of Automation Science and Engineering,Xi'an Jiaotong University,Xi'an 710100,Shaanxi Province,China;StateGrid Henan Electric PowerCompany,Zhengzhou 450000,Henan Province,China)

机构地区：[1]国网河南省电力公司电力科学研究院,河南省郑州市450052 [2]西安交通大学自动化科学与工程学院,陕西省省西安市710100 [3]国网河南省电力公司,河南省郑州市450000

出　　处：《电网技术》2022年第12期4947-4953,共7页Power System Technology

摘　　要：随着我国“碳达峰、碳中和”战略推进,火电机组更多地参与深度调峰运行。深度调峰工况下,以传统试验测试方式获得的机组一次调频模型不能反映真实的一次调频动态,存在较大偏差。针对此问题,提出了一种面向深度调峰运行火电机组的一次调频建模与参数辨识方法。首先,根据机组一次调频机理,推导了一次调频模型参数随机组主蒸汽压力变化的非线性关系,进而设计了适用于深度调峰工况的新型变参数一次调频模型。进一步论证了新模型中可变参数具有耦合特性,在数学上存在不可完全辨识性。为解决此问题,对模型进行了等价变换,实现了待辨识参数的降阶,最终获得可表征深度调峰工况下一次调频能力的新型建模方法。以河南鲁阳电厂2#机组运行数据检验该文方法,以该文方法获得的机组一次调频模型能以较高精度表征机组在深度调峰工况下的一次调频动态,并且,模型精度不随机组运行负荷变化而变化,具有很好的一致性。For the promotion of China's"carbon peaking and carbon neutrality"strategy,the thermal power units are more involved than ever in the deep peak regulation.Under the deep peak regulation,the primary frequency regulation model obtained from the traditional experimental testing has large deviationswith the real primary frequency regulation dynamics.To address this problem,a primary frequency regulation modeling and parameter identification method for the thermal power units in deep peak regulation is proposed.Firstly,the nonlinear relationship between the parameters of the primary frequency regulation model and the main steam pressure of the unit is derived based on the primary frequency regulation mechanism of theunit.Then a new variable parameter primary frequency regulation model is designed for deep peak regulation conditions.Further,it is demonstrated that the variable parameters in the new model have coupling characteristics and are not fully identifiable in mathematical ways.In order to solve this problem,the model is equivalently transformed to achieve the reduced order of the parameters.Finallya newmodelingmethod isobtained to characterize the primary frequency regulation capabilityunder the deep peak regulation.The primary frequency regulationmodel obtained by this method can characterize the primary frequency regulation dynamics of the unit under the deep peaking regulation with high accuracy,and the accuracy of the model has good consistency without changing with the operating load of theunits.

关 键 词：一次调频 深度调峰 变参数 建模 参数辨识 

分 类 号：TM721[电气工程—电力系统及自动化]