基于实测数据的负荷频率参数辨识及影响分析
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摘要
特高压直流受端电网中,换流站闭锁故障可能引起交流系统频率大幅波动,其中负荷的频率特性对系统频率响应具有重要影响。首先,分析了采用电力电子接口的新型负荷设备频率特性,以及当前此类负荷设备比重不断增加情况下负荷总体的频率特性变化趋势。然后,基于华东电网直流闭锁故障的实测数据,分别对节点和全电网的负荷频率模型进行了拟合,得出了负荷总体频率响应特性变弱的结论。最后,采用华东电网算例对实测模型与原有模型进行了对比仿真,验证了原有负荷频率模型偏于乐观。
In a receiving power grid with ultra-high voltage direct current,the block fault in an inverter station may cause large frequency fluctuations,in which the frequency characteristics of load play an important role in the frequency response of the system. First,the frequency characteristics of new types of load equipment with power electronic interface are analyzed,and the trend of frequency characteristics of the total load is studied under the assumption that the proportion of this type of load equipment increases continuously. Then,based on the measured data from East-China power grid under DC block fault,the frequency models of load on the bus and the whole grid are fitted,respectively,and it is concluded that the frequency response characteristics of the total load are becoming weaker. Finally,the measurement model and the original model are compared and simulated with East-China power grid as a numerical example,which verifies that the original load frequency model is prone to be optimistic.
In a receiving power grid with ultra-high voltage direct current,the block fault in an inverter station may cause large frequency fluctuations,in which the frequency characteristics of load play an important role in the frequency response of the system. First,the frequency characteristics of new types of load equipment with power electronic interface are analyzed,and the trend of frequency characteristics of the total load is studied under the assumption that the proportion of this type of load equipment increases continuously. Then,based on the measured data from East-China power grid under DC block fault,the frequency models of load on the bus and the whole grid are fitted,respectively,and it is concluded that the frequency response characteristics of the total load are becoming weaker. Finally,the measurement model and the original model are compared and simulated with East-China power grid as a numerical example,which verifies that the original load frequency model is prone to be optimistic.
引文
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[3]王莹,刘兵,刘天斌,等(Wang Ying,Liu Bing,Liu Tianbin,et al).特高压直流闭锁后省间紧急功率支援的协调优化调度策略(Coordinated optimal dispatching of emergency power support among provinces after UHVDC transmission system block fault)[J].中国电机工程学报(Proceedings of the CSEE),2015,35(11):2695-2702.
[4] Huang Lei,Chen Qian,Ju Ping,et al. Research on load model of VF based motor drive[C]//IEEE International Conference on Power System Technology. Wollongong,Australia,2016.
[5]鞠平,马大强.电力系统建模[M]. 2版.北京:中国电力出版社,2008.
[6]曾博,杨雍琦,段金辉,等(Zeng Bo,Yang Yongqi,Duan Jinhui,et al).新能源电力系统中需求侧响应关键问题及未来研究展望(Key issues and research prospects for demand-side response in alternate electrical power systems with renewable energy sources)[J].电力系统自动化(Automation of Electric Power Systems),2015,39(17):10-18.
[7]李传栋,王建明,杨桂钟,等(Li Chuandong,Wang Jianming,Yang Guizhong,et al).直流孤岛运行协调优化控制研究(Research on coordinated optimization control for islanding operation)[J].电力系统及其自动化学报(Proceedings of the CSU-EPSA),2017,29(11):123-128,150.
[8]洪潮(Hong Chao).云广特高压直流孤岛运行方式下单极闭锁故障分析(Mono-polar blocking fault analysis of Yunnan-Guangdong UHVDC system islanding operation)[J].中国电机工程学报(Proceedings of the CSEE),2016,36(7):1801-1807.
[9] Sharma C S,Nagwani T. Simulation and analysis of PWM inverter fed induction motor drive[J]. International Journal of Science,Engineering and Technology Research,2013,2(2):356-366.
[10]张孝,鞠平,陈谦,等(Zhang Xiao,Ju Ping,Chen Qian,et al).考虑频率特性的负荷模型研究及应用(Study and application of load models considering frequency characteristics)[J].河海大学学报:自然科学版(Journal of Hohai University:Natural Sciences),2010,38(3):353-358.
[11]梁伟,鞠平,余一平(Liang Wei,Ju Ping,Yu Yiping).考虑频率特性的感应电动机负荷模型的对比研究(Comparative study of the induction motor load models with and without considering frequency characteristics)[J].电力系统保护与控制(Power System Protection and Control),2014,42(9):132-138.
[12]贺仁睦,叶静,林盾,等(He Renmu,Ye Jing,Lin Dun,et al).负荷模型及参数对系统动态过程中频率的影响(Impacts of load model parameters on system frequency during the system transients)[J].电力系统自动化(Automation of Electric Power Systems),2010,34(24):27-30.
[13]鞠平.电力系统建模理论与方法[M].北京:科学出版社,2010.
[14]赵强,张丽,王琦,等(Zhao Qiang,Zhang Li,Wang Qi,et al).系统负荷频率特性对电网频率稳定性的影响(Impact of load frequency characteristics on frequency stability of power systems)[J].电网技术(Power System Technology),2011,35(3):69-73.
[15]鞠平,马大强(Ju Ping,Ma Daqiang).电力负荷的动静特性对低频振荡阻尼的影响分析(Effects of static and dynamic loads on the damping of low-frequency oscillations in electric power systems)[J].浙江大学学报:自然科学版(Journal of Zhejiang University:Natural Science),1989,23(5):750-760.