一种计及紧急功率支援的直流互联异步电网动态频率分析方法
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摘要
针对于直流互联异步电网,提出了一种可在计及直流紧急功率支援情况下,同时考虑直流两侧电网频率响应的扰动后动态频率分析方法。该方法对直流两侧电网的交流系统网络方程、综合负荷的静态模型、发电机原动机-调速器系统模型以及HVDC输电系统准稳态模型进行线性化处理,基于广域量测数据建立了直流互联异步电网扰动后的系统状态方程,可以同时求解出计及直流紧急功率支援的两侧电网频率动态响应。在此基础上利用二分法思想调整功率支援量,还可以获取某侧电网扰动后的频率极值或稳态值恢复到期望值所需的直流紧急功率支援量。对一个典型的两区域直流互联异步电网进行了仿真分析,验证了所提方法具有很高的精确性和适用性。
Aiming at HVDC-interconnected asynchronous power grid, a dynamic frequency analysis method is proposed, to obtain post-disturbance frequency response of power grids on both sides of the HVDC system considering emergency DC power support. This method integrates AC system network equation, static load model, prime mover-governor system model and quasi-steady-state model of HVDC transmission system to establish state equation of the HVDC-interconnected asynchronous power grid based on data of wide area measurement system(WAMS). By solving the state equation, the dynamic response curves of the power grids on both sides of the HVDC system are obtained. On the basis of the proposed method, the emergency DC power support amount can be obtained accurately using binary search, necessary to restore the limiting or steady-state frequency of one side power grid of HVDC system to the expected level. Simulation and analysis of a typical two-area HVDC-interconnected asynchronous power grid are carried out to verify accuracy and applicability of the proposed method.
Aiming at HVDC-interconnected asynchronous power grid, a dynamic frequency analysis method is proposed, to obtain post-disturbance frequency response of power grids on both sides of the HVDC system considering emergency DC power support. This method integrates AC system network equation, static load model, prime mover-governor system model and quasi-steady-state model of HVDC transmission system to establish state equation of the HVDC-interconnected asynchronous power grid based on data of wide area measurement system(WAMS). By solving the state equation, the dynamic response curves of the power grids on both sides of the HVDC system are obtained. On the basis of the proposed method, the emergency DC power support amount can be obtained accurately using binary search, necessary to restore the limiting or steady-state frequency of one side power grid of HVDC system to the expected level. Simulation and analysis of a typical two-area HVDC-interconnected asynchronous power grid are carried out to verify accuracy and applicability of the proposed method.
引文
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[17]王莹,刘兵,刘天斌,等.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[J].中国电机工程学报,2015,35(11):2695-2702.Wang Ying,Liu Bing,Liu Tianbin,et al.Minimum frequency prediction of power system after disturbance based on the WAMSdata[J].Proceedings of the CSEE,2015,35(11):2695-2702(in Chinese).
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[19]艾鹏,滕予非,王晓茹,等.计及紧急直流功率支援的扰动后稳态频率预测算法[J].电力系统自动化,2017,41(13):92-99.Ai Peng,Teng Yufei,Wang Xiaoru,et al.Prediction algorithm of steady frequency after disturbances considering emergency DC power support[J].Automation of Electric Power Systems,2017,41(13):92-99(in Chinese).
[20]张彦涛,秦晓辉,周勤勇,等.基于交直流解耦的超大规模交直流混合电网潮流计算可行解获取方法的研究[J].中国电机工程学报,2015,35(24):6275-6282.Zhang Yantao,Qin Xiaohui,Zhou Qingyong,et al.Study on the acquisition method of the feasible solution for power flow calculation of large-scale power grids based on AC/DC decoupling[J].Proceedings of the CSEE,2015,35(24):6275-6282(in Chinese).
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[22]刘健,尹海霞,尚海仓,等.基于二分法的本地控制改善含分布式电源配电网电压质量[J].电力系统保护与控制,2016,44(18):61-67.Liu Jian,Yin Haixia,Shang Haicang,et al.Voltage performance improvement by dichotomy based local control for power distribution networks with distributed generation[J].Power System Protection and Control,2016,44(18):61-67(in Chinese).
[2]姚良忠,吴婧,王志冰,等.未来高压直流电网发展形态分析[J].中国电机工程学报,2014,34(34):6007-6020.Yao Liangzhong,Wu Jing,Wang Zhibing,et al.Pattern analysis of future HVDC grid development[J].Proceedings of the CSEE,2014,34(34):6007-6020(in Chinese).
[3]焦在滨,金吉良,行武,等.交直流混联电网自适应交流过电压保护方案的研究[J].电网技术,2016,40(8):2541-2547.Jiao Zaibin,Jin Jiliang,Xing Wu,et al.Research of new scheme of adaptive overvoltage protection in hybrid AC/DC grid[J].Power System Technology,2016,40(8):2541-2547(in Chinese).
[4]张宁宇,周前,唐竞驰,等.适用于交直流混联受端电网的机组组合模型及算法[J].电力系统自动化,2017,41(11):77-84.Zhang Ningyu,Zhou Qian,Tang Jingchi,et al.Unit commitment model and algorithm for receiving-end power grid in hybrid AC/DCsystem[J].Automation of Electric Power Systems,2017,41(11):77-84(in Chinese).
[5]王菲,刘建琴,韩丰,等.应用直流调制改善水电能源基地交流电网运行特性[J].电网技术,2017,41(12):3911-3916.Wang Fei,Liu Jianqin,Han Feng,et al.Application of DC modulation to improve operation characteristics of hydropower base grid[J].Power System Technology,2017,41(12):3911-3916(in Chinese).
[6]周明,翟俊义,任建文,等.含风电并网的直流互联电网分散协调调度方法[J].电网技术,2017,41(5):1428-1434.Zhou Ming,Zhai Junyi,Ren Jianwen,et al.A decentralized coordinated dispatch approach for interconnected power grid with wind power via HVDC tie-Line[J].Power System Technology,2017,41(5):1428-1434(in Chinese).
[7]王斌,夏叶,夏清,等.直流跨区互联电网发输电计划模型与方法[J].电力系统自动化,2016,40(3):8-13.Wang Bin,Xia Ye,Xia Qing,et al.Model and methods of generation and transmission scheduling of inter-regional power grid via HVDCtie-line[J].Automation of Electric Power Systems,2016,40(3):8-13(in Chinese).
[8]李常刚,刘玉田,张恒旭,等.基于直流潮流的电力系统频率响应分析方法[J].中国电机工程学报,2009,29(34):36-41.Li Changgang,Liu Yutian,Zhang Hengxu,et al.Power system frequency response analysis based on the direct current loadflow[J].Proceedings of the CSEE,2009,29(34):36-41(in Chinese).
[9]Du L,Liu J,Lei X.The primary frequency regulation dynamic model based on power network[C]//International Conference on Power System Technology,2006.Power Con 2006.Chongqing:IEEE,2006:1-8.
[10]Aik,Denis L H.A general-order system frequency response model incorporating load shedding:analytic modeling and applications[J].IEEE Transactions on Power Systems,2006,21(2):709-717.
[11]Bai F,Zhu L,Liu Y,et al.Design and implementation of a measurement-based adaptive wide-area damping controller considering time delays[J].Electric Power Systems Research,2016,130:1-9.
[12]Larsson M.An adaptive predictive approach to emergency frequency control in electric power systems[C]//44th IEEE Conference on Decision and Control,2005 and 2005 European Control Conference.CDC-ECC'05.Seville:IEEE,2005:4434-4439.
[13]Thorp J S,Wang X,Hopkinson K M,et al.Agent technology applied to the protection of power systems[M].Berlin,Germany:Springer,2003:115-154.
[14]张薇,王晓茹,廖国栋.基于广域量测数据的电力系统自动切负荷紧急控制算法[J].电网技术,2009,33(3):69-73.Zhang Wei,Wang Xiaoru,Liao Guodong.Automatic load shedding emergency control algorithm of power system based on wide-area measurement data[J].Power System Technology,2009,33(3):69-73(in Chinese).
[15]刘克天,王晓茹.基于广域量测数据的电力系统动态频率分析方法[J].电网技术,2013,37(8):2201-2206.Liu Ketian,Wang Xiaoru.A wide-area measurement data based method for power system dynamic frequency analysis[J].Power System Technology,2013,37(8):2201-2206(in Chinese).
[16]刘克天,王晓茹,薄其滨.基于广域量测的电力系统扰动后最低频率预测[J].中国电机工程学报,2014,34(13):2188-2195.Liu Ketian,Wang Xiaoru,Bo Qibin.Minimum frequency prediction of power system after disturbance based on the WAMS data[J].Proceedings of the CSEE,2014,34(13):2188-2195(in Chinese).
[17]王莹,刘兵,刘天斌,等.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[J].中国电机工程学报,2015,35(11):2695-2702.Wang Ying,Liu Bing,Liu Tianbin,et al.Minimum frequency prediction of power system after disturbance based on the WAMSdata[J].Proceedings of the CSEE,2015,35(11):2695-2702(in Chinese).
[18]Zhao Y,Liu C,Li G,et al.Design of LCC HVDC wide-area emergency power support control based on adaptive dynamic surface control[J].IET Generation,Transmission&Distribution,2017,11(13):3236-3245.
[19]艾鹏,滕予非,王晓茹,等.计及紧急直流功率支援的扰动后稳态频率预测算法[J].电力系统自动化,2017,41(13):92-99.Ai Peng,Teng Yufei,Wang Xiaoru,et al.Prediction algorithm of steady frequency after disturbances considering emergency DC power support[J].Automation of Electric Power Systems,2017,41(13):92-99(in Chinese).
[20]张彦涛,秦晓辉,周勤勇,等.基于交直流解耦的超大规模交直流混合电网潮流计算可行解获取方法的研究[J].中国电机工程学报,2015,35(24):6275-6282.Zhang Yantao,Qin Xiaohui,Zhou Qingyong,et al.Study on the acquisition method of the feasible solution for power flow calculation of large-scale power grids based on AC/DC decoupling[J].Proceedings of the CSEE,2015,35(24):6275-6282(in Chinese).
[21]赵畹君.高压直流输电工程技术[M].北京:中国电力出版社,2004:103-114.
[22]刘健,尹海霞,尚海仓,等.基于二分法的本地控制改善含分布式电源配电网电压质量[J].电力系统保护与控制,2016,44(18):61-67.Liu Jian,Yin Haixia,Shang Haicang,et al.Voltage performance improvement by dichotomy based local control for power distribution networks with distributed generation[J].Power System Protection and Control,2016,44(18):61-67(in Chinese).
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