基于辨识模型的中间再热机组一次调频特性研究  

Study on Primary Frequency Modulation Characteristics of Intermediate Reheat Unit based on Identification Model

作　　者：郑少雄 曹越 王永庆 戴义平[1] ZHENG Shao-xiong;CAO Yue;WANG Yong-qing;DAI Yi-ping(School of Energy and Power Engineering,Xi’an Jiaotong University,Xi’an 710049,China;Key Laboratory of Energy Thermal Conversion and Control of Ministry of Education,Southeast University,Nanjing 210096,China;Shaanxi Electric Power Research Institute,State Grid Corporation of China,Xi’an 710100,China)

机构地区：[1]西安交通大学叶轮机械研究所,动力工程多相流国家重点实验室,陕西西安710049 [2]东南大学能源热转换及其过程测控教育部重点实验室,江苏南京210096 [3]国家陕西省电力公司电力科学研究院,陕西西安710100

出　　处：《热能动力工程》2020年第7期12-20,共9页Journal of Engineering for Thermal Energy and Power

摘　　要：大规模的发电机组并网将导致电网负荷变动及发电机跳闸等造成电网频率波动事故,调频能力不足。为解决此问题,提出了一种耦合控制超临界中间再热机组高压、中压调节阀参与电网一次调频的控制策略。在MATLAB/SIMULINK仿真平台搭建了超临界中间再热机组模型,基于实测数据采用直接LMS和间接LMS对模型中的未知参数进行辨识并模拟机组参与一次调频。仿真结果表明:采用的直接LMS和间接LMS两种方法均具有很高的辨识精度,同时控制高、中压调节阀并加入前馈作用时能减小机械功率输出的超调量,且能快速、稳定及安全地响应电网一次调频要求;不同条件下的仿真试验结果表明,合理拟合模型中的参数,可以使一次调频性能得到显著改善。Large-scale grid connection of generator sets will cause power grid load changes and generator tripping,resulting in power grid frequency fluctuation accidents and insufficient frequency modulation capacity.In order to solve this problem,a control strategy of coupling the control of high and medium pressure regulating valves of supercritical intermediate reheating units into the primary frequency modulation of power grid is proposed.In this paper,a supercritical intermediate reheat unit model is built on the MATLAB/SIMULINK simulation platform.Based on the measured data,direct LMS and indirect LMS are used to identify unknown parameters in the model and simulate the unit′s participation in primary frequency modulation.The simulation results show that both the direct LMS and indirect LMS methods adopted have high identification accuracy,and the overshooting of mechanical power output can be reduced when the high and medium pressure regulating valves are controlled simultaneously and feedforward is added,and the primary frequency modulation requirements of the power grid can be met quickly,stably and safely.The simulation results under different conditions show that the performance of primary frequency modulation can be significantly improved by fitting the parameters in the model.

关 键 词：中间再热 直接LMS 间接LMS 参数辨识 一次调频 

分 类 号：TK323[动力工程及工程热物理—热能工程]