二次再热机组一次调频特性的研究
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摘要
二次再热机组流程复杂,惯性较大,其一次调频特性对电厂的运行稳定性、灵活性影响较大,因此,有必要研究二次再热机组的一次调频特性。以GSE仿真平台为基础,采用JTopmeret模块和自定义程序相结合的形式,建立了超超临界二次再热汽轮机的仿真模型与一次调频模型,并对此进行了模型校核。在此基础上,研究了二次再热机组参与一次调频过程中的热力参数响应特性,分析了负荷阶跃幅度、调速不等率对二次再热机组一次调频特性的影响。结果表明:二次再热机组一次调频过程的基本过程是负载功率的阶跃增加时,实时频率迅速减小,DEH汽轮机控制系统将迅速采取措施增大高压缸前的GV开度,然后主蒸汽流量增加,一二次再热蒸汽流量增加,最后燃煤发电机组的有效功率将迅速改变,以减少频率的偏差。在二次再热机组一次调频过程中,频率的动态超调量随负荷阶跃幅度或调速不等率下降而增大。频率的调节时间随着负荷阶跃幅度的增大或调速不等率的下降而延长。且在调速不等率与负荷阶跃幅度相等时,负载负荷阶跃增加时,频率的最大超调量较大,稳态偏差差别不大。研究结果有望为二次再热机组的灵活运行提供参考。
Primary frequency regulation characteristics of double reheat unit have a great impact on the operational stability and flexibility of power system due to its complicated flowing processes and larger inertia. Therefore, it is necessary to study the primary frequency regulation characteristics of double reheat units. Based on the GSE simulation platform, the dynamic simulation models of the ultra-supercritical double reheat power plant and primary frequency regulation were developed by the combination of JTopmeret module and self-defined program, and the models was verified. Then, the response characteristics of the thermal parameters in the double reheat unit during the primary frequency regulation processes were studied. The effects of the load step amplitude and the speed droop on the primary frequency regulation characteristics were analyzed. The results show that the primary frequency regulation process of the double reheat unit is that when the step of the load power increases, the real-time frequency decreases rapidly, DEH turbine control system will quickly take measures to increase the GV opening degree in front of the high pressure cylinder, then the flow rates of live and reheat steam increase, the effective power of the coal-fired power plants will change rapidly to reduce the frequency deviation. During the primary frequency regulation of the double reheat units, the dynamic overshoot of the frequency increases with the decrease of load step amplitude or the speed droop. The adjustment time of frequency prolongs as the load step increases or the speed droop decreases. Moreover, when the speed droop and load step amplitude are same, the dynamic overshoot of frequency is higher during load increasing processes and the steady deviations of frequency are similar. This study is hoped to apply some guidance about the operational flexibility of double reheat power plants.
Primary frequency regulation characteristics of double reheat unit have a great impact on the operational stability and flexibility of power system due to its complicated flowing processes and larger inertia. Therefore, it is necessary to study the primary frequency regulation characteristics of double reheat units. Based on the GSE simulation platform, the dynamic simulation models of the ultra-supercritical double reheat power plant and primary frequency regulation were developed by the combination of JTopmeret module and self-defined program, and the models was verified. Then, the response characteristics of the thermal parameters in the double reheat unit during the primary frequency regulation processes were studied. The effects of the load step amplitude and the speed droop on the primary frequency regulation characteristics were analyzed. The results show that the primary frequency regulation process of the double reheat unit is that when the step of the load power increases, the real-time frequency decreases rapidly, DEH turbine control system will quickly take measures to increase the GV opening degree in front of the high pressure cylinder, then the flow rates of live and reheat steam increase, the effective power of the coal-fired power plants will change rapidly to reduce the frequency deviation. During the primary frequency regulation of the double reheat units, the dynamic overshoot of the frequency increases with the decrease of load step amplitude or the speed droop. The adjustment time of frequency prolongs as the load step increases or the speed droop decreases. Moreover, when the speed droop and load step amplitude are same, the dynamic overshoot of frequency is higher during load increasing processes and the steady deviations of frequency are similar. This study is hoped to apply some guidance about the operational flexibility of double reheat power plants.
引文
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[11] Yunliang Zhao, Chaoyang Wang, Ming Liu, et al. Improving operational flexibility by regulating extraction steam of high-pressure heaters on a 660MW supercritical coal-fired power plant: A dynamic simulation[J]. Applied Energy, 2018(212): 1295-1309.
[12]Yong Hu, Deliang Zeng, Jizhen Liu, et al.Dynamic model for controller design of condensate throttling systems[J].ISA Transactions,2015(58):622-628.
[13]Dongteng Long, Wei Wang, Chu Yao, et al. An experiment-based model of condensate throttling and its utilization in load control of 1000 MW power units[J]. Energy, 2017(133):941-954.
[14]Wei Wang, Jizhen Liu, Deliang Zeng, et al. Modeling for condensate throttling and its application on the flexible load control of power plants[J]. Applied Thermal Engineering, 2016( 95):303-310.
[15]Wei Wang, Lu Li, Dongteng Long, et al. Improved boiler-turbine coordinated control of 1000MW power units by introducing condensate throttling[J]. Journal of Process Control, 2017(50):11-18.
[16]冀川,许海雷,李勇.提高二次再热机组一次调频响应的策略[J].电力科技与环保,2018,34(6):37-39.
[17]李勇,许海雷.凝结水节流参与的1000MW二次再热机组一次调频控制方法[J].电力科技与环保,2018,34(6):34-36.
[18]Cuicui Wu, Lin Gao, Junrong Xia, et al. Analysis of effects on primary frequency control and power grid stability of different control logic[C]. Industrial Electronics and Applications (ICIEA), 2010 the 5th IEEE Conference on,2010.
[2]Franco Alessandro, Diaz Ana R, The future challenges for "clean coal technologies": Joining efficiency increase and pollutant emission control[J]. Energy, 2009,34(3):348-354.
[3]Luyao Zhou, Gang Xu, Shifei Zhao, et al. Parametric analysis and process optimization of steam cycle in double reheat ultra-supercritical power plants[J]. Applied Thermal Engineering, 2016(99):652-660.
[4]王月明,牟春华,姚明宇,等.二次再热技术发展与应用现状[J].热力发电,2017,46(8):1-10+15.
[5]Olauson Jon, Ayob Mohd Nasir, Bergkvist Mikael, et al. Net load variability in Nordic countries with a highly or fully renewable power system[J]. Nature Energy, 2016, 1(175):1-8.
[6]Lu Xi, McElroy Michael B, Peng Wei, et al. Challenges faced by China compared with the US in developing wind power[J]. Nature Energy, 2016(1):1-6.
[7]舒印彪,张智刚,郭剑波,等. 新能源消纳关键因素分析及解决措施研究[J]. 中国电机工程学报, 2017, 37(1): 1-8.
[8]Alizadeh M I, Parsa M M, Amjady N, et al. Flexibility in future power systems with high renewable penetration: A review[J]. Renewable and Sustainable Energy Reviews, 2016(57):1186-1193.
[9]黄卫剑,张曦,陈世和,等. 提高火电机组一次调频响应速度[J].中国电力, 2011, 44(1):73-77.
[10]Yunliang Zhao, Ming Liu, Chaoyang Wang, et al. Increasing operational flexibility of supercritical coal-fired power plants by regulating thermal system configuration during transient processes[J]. Applied Energy, 2018(228): 2375-2386.
[11] Yunliang Zhao, Chaoyang Wang, Ming Liu, et al. Improving operational flexibility by regulating extraction steam of high-pressure heaters on a 660MW supercritical coal-fired power plant: A dynamic simulation[J]. Applied Energy, 2018(212): 1295-1309.
[12]Yong Hu, Deliang Zeng, Jizhen Liu, et al.Dynamic model for controller design of condensate throttling systems[J].ISA Transactions,2015(58):622-628.
[13]Dongteng Long, Wei Wang, Chu Yao, et al. An experiment-based model of condensate throttling and its utilization in load control of 1000 MW power units[J]. Energy, 2017(133):941-954.
[14]Wei Wang, Jizhen Liu, Deliang Zeng, et al. Modeling for condensate throttling and its application on the flexible load control of power plants[J]. Applied Thermal Engineering, 2016( 95):303-310.
[15]Wei Wang, Lu Li, Dongteng Long, et al. Improved boiler-turbine coordinated control of 1000MW power units by introducing condensate throttling[J]. Journal of Process Control, 2017(50):11-18.
[16]冀川,许海雷,李勇.提高二次再热机组一次调频响应的策略[J].电力科技与环保,2018,34(6):37-39.
[17]李勇,许海雷.凝结水节流参与的1000MW二次再热机组一次调频控制方法[J].电力科技与环保,2018,34(6):34-36.
[18]Cuicui Wu, Lin Gao, Junrong Xia, et al. Analysis of effects on primary frequency control and power grid stability of different control logic[C]. Industrial Electronics and Applications (ICIEA), 2010 the 5th IEEE Conference on,2010.
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