含风电和柔性直流的电力系统多场景概率无功优化
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摘要
随着大规模风电并网以及多端柔性直流VSC-MTDC的广泛应用,传统无功优化己不能很好地适应现今包含间歇性风电场的交直流并列运行系统。本文提出一种基于场景分析法的含风电场及VSC-MTDC的交直流并列运行系统无功优化方法,首先统计风电场出力的历史数据拟合风电出力的多场景概率,接着通过考虑风电场的多场景组合,建立以多场景下的综合网损期望值最小化为目标函数,计及VSC-MTDC系统级控制策略的交直流系统运行约束的含风电场和VSC-MTDC参与的多场景无功优化模型,并采用全局最优解求解器Ipopt分别求解主从控制模式以及电压下垂控制模式下的最优无功方案。最后以实际的广东南澳片网作为算例进行分析,通过与单一场景下主从控制、下垂控制模型下的优化方案进行对比,验证了本文所提方法的有效性。
With the wide application of large scale of wind power integration and multi terminal flexible DC VSC-MTDC, the traditional reactive power optimization cannot suit well AC and AC parallel operation system including intermittent wind farm. In this paper, a kind of reactive power optimization method of AC and DC parallel operation based on scenario analysis method including wind farm and VSC-MTDC. Firstly,the statistics of the history data of wind farm output is done so to match multi-scenario probability of the wind farm output, then the minimum of the expected value of comprehensive grid loss under the multiscenario is established as the objective function and reactive power optimization model of AC and DC system operation constraints(containing wind farm) of the control strategy of VSC-MTDC system and involved by VSC-MTDC is taken into account. The global optimal solver popt is adopted to solve optimal reactive power proposal under main and slave control mode and voltage sag control mode. Finally, the real Nanao regional grid of Guangdong is taken as an example for analysis, the effectiveness of the proposed method is verified through comparison of the optimization proposal under the master and slave control as well as sag control model of the single-scenario.
With the wide application of large scale of wind power integration and multi terminal flexible DC VSC-MTDC, the traditional reactive power optimization cannot suit well AC and AC parallel operation system including intermittent wind farm. In this paper, a kind of reactive power optimization method of AC and DC parallel operation based on scenario analysis method including wind farm and VSC-MTDC. Firstly,the statistics of the history data of wind farm output is done so to match multi-scenario probability of the wind farm output, then the minimum of the expected value of comprehensive grid loss under the multiscenario is established as the objective function and reactive power optimization model of AC and DC system operation constraints(containing wind farm) of the control strategy of VSC-MTDC system and involved by VSC-MTDC is taken into account. The global optimal solver popt is adopted to solve optimal reactive power proposal under main and slave control mode and voltage sag control mode. Finally, the real Nanao regional grid of Guangdong is taken as an example for analysis, the effectiveness of the proposed method is verified through comparison of the optimization proposal under the master and slave control as well as sag control model of the single-scenario.
引文
[1]陈旭,羿应棋,张勇军.考虑风电场随机波动性的变电站关口无功控制区间整定方法[J].电力系统自动化,2016,40(15):141-147.CHEN Xu, YI Yingqi, ZHANG Yongjun. Setting method of reactive power interval for substation gateway considering stochastic volatility of wind farm[J]. Automation of Electric Power System,2016,40(15):141-147.
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[6]黄俊辉,汪惟源,王海潜,等.基于模拟退火遗传算法的交直流系统无功优化与电压控制研究[J].电力系统保护与控制,2016,44(10):37-43.HUANG Junhui, WANG Weiyuan, WANG Haiqian, et al.Study of hybrid genetic algorithm and annealing algorithm on reactive power optimization and voltage control in AC/DC transmission system[J]. Power System Protection and Control,2016,44(10):37-43.
[7]李兴,杨智斌,颜远,等.考虑换流站损耗特性的交直流系统多目标无功优化控制[J].电力系统保护与控制,2017(9):119-125.LI Xing, YANG Zhibin,YAN Yuan,et al. Multi-objective reactive power optimal control of AC-DC systems including power loss characteristics of converter stations[J]. Power System Protection and Control, 2017(9):119-125.
[8]卫志农,季聪,孙国强,等.含VSC-HVDC的交直流系统内点法最优潮流计算[J].中国电机工程学报,2012,32(19):89-95.WEI Zhinong,JI Cong, SUN Guoqiang,et al. Interior-point optimal power flow of AV/DC system with VSC-HVDC[J].Proceedings of the CSEE, 2012,32(19):89-95.
[9]卫志农,季聪,郑玉平,等.计及VSC-HVDC的交直流系统最优潮流统一混合算法[J].中国电机工程学报,2014,34(4):635-643.WEI Zhinong,JI Cong,ZHENG Yuping,et al. Optimal power flow of AC-DC systems with VSC-HVDC based on a novel unified hybrid algorithm[J]. Proceedings of the CSEE,2014,34(4):635-643.
[10]柯圣舟,郑欢,林毅,等.计及柔性直流输电系统损耗模型的交直流电网无功优化[J].电网技术,2016(10):3052-3058.KE Shengzhou,ZHENG Huan,LIN Yi,et al. Reactive power optimization of AC/DC grid in consideration of VSCHVDC transmission loss model[J]. Power System Technology, 2016(10):3052-3058.
[11]王鹤,刘禹彤,李国庆,等.基于最优潮流的多端柔性直流输电系统控制策略[J].电力系统自动化,2017,41(11):150-155.WANG He, LIU Yutong, LI Guoqing, et al. Control strategy for VSC-based multi-terminal DC transmission system based on optimal power flow[J]. Automation of Electric Power Systems,2017,41(11):150-155.
[12]苗丹,刘天琪,王顺亮,等.含柔性直流电网的交直流混联系统潮流优化控制[J].电力系统自动化,2017,41(12):70-76.MIAO Dan, LIU Tianqi, WANG Shunliang, et al. Optimal control for power flow of AC/DC hybrid system with flexible DC grid[J]. Automation of Electric Power Systems,2017,41(12):70-76.
[13]尹青,杨洪耕,马晓阳.含大规模风电场的电网概率无功优化调度[J].电网技术,2017,41(2):514-520.YIN Qing, YANG Honggeng, MA Xiaoyang. Probabilistic optimal reactive power dispatch of power grid with largescale wind farm integration[J]. Power System Technology,2017,41(2):514-520.
[14]明杰,向红吉,戴朝华,等.大规模风电接人的运行场景无功优化评估[J].电网技术,2016,40(9):2737-2742.MING Jie, XIANG Hongji, DAI Chaohua, et al. Operation scenario reactive power optimization assessment with large-scale wind farm integration[J]. Power System Technology,2016,40(9):2737-2742.
[15]雷宇,杨明,韩学山.基于场景分析的含风电系统机组组合的两阶段随机优化[J].电力系统保护与控制,2012(23):58-67.LEI Yu, YANG Ming, HAN Xueshan. A two-stage stochastic optimization of unit commitment considering wind power based on scenario analysis[J]. Power System Protection and Control,2012(23):58-67.
[16]谭嫣.南澳柔性直流输电系统运行控制研究及应用[D].广州:华南理工大学,2015.
[2] CHEN Xu, YI Yingqi, ZHANG Yongjun, et al. Approach to setting gateway reactive power control band for distribution networks with wind power[J]. IET Generation Transmission&Distribution, 2017,11(3, SI):596-604.
[3] SAKAMURI J N, RATHER Z H, RIMEZ J A, et al. Coordinated voltage control in offshore HVDC connected cluster of wind power plants[J]. IEEE Transactions on Sustainable Energy,2016,7(4):1592-1601.
[4]颜伟,张海兵,田甜,等.交直流系统的动态无功优化[J].电力系统自动化,2009,33(10):43-46.YAN Wei,ZHANG Haibing,TIAN Tian,et al. Dynamic reactive power optimization of AC/DC system[J]. Automation of Electric Power Systems,2009,33(10):43-46.
[5]张元,刘明波,李清.计及直流功率日调节次数约束的交直流系统无功优化实用化方法[J].电网技术,2015(3):791-796.ZHANG Yuan, LIU Mingbo, LI Qing. A practical reactive power optimization method of AC/DC power grid incorporated with daily regulation constraints of DC transmission power[J]. Power System Technology,2015(3):791-796.
[6]黄俊辉,汪惟源,王海潜,等.基于模拟退火遗传算法的交直流系统无功优化与电压控制研究[J].电力系统保护与控制,2016,44(10):37-43.HUANG Junhui, WANG Weiyuan, WANG Haiqian, et al.Study of hybrid genetic algorithm and annealing algorithm on reactive power optimization and voltage control in AC/DC transmission system[J]. Power System Protection and Control,2016,44(10):37-43.
[7]李兴,杨智斌,颜远,等.考虑换流站损耗特性的交直流系统多目标无功优化控制[J].电力系统保护与控制,2017(9):119-125.LI Xing, YANG Zhibin,YAN Yuan,et al. Multi-objective reactive power optimal control of AC-DC systems including power loss characteristics of converter stations[J]. Power System Protection and Control, 2017(9):119-125.
[8]卫志农,季聪,孙国强,等.含VSC-HVDC的交直流系统内点法最优潮流计算[J].中国电机工程学报,2012,32(19):89-95.WEI Zhinong,JI Cong, SUN Guoqiang,et al. Interior-point optimal power flow of AV/DC system with VSC-HVDC[J].Proceedings of the CSEE, 2012,32(19):89-95.
[9]卫志农,季聪,郑玉平,等.计及VSC-HVDC的交直流系统最优潮流统一混合算法[J].中国电机工程学报,2014,34(4):635-643.WEI Zhinong,JI Cong,ZHENG Yuping,et al. Optimal power flow of AC-DC systems with VSC-HVDC based on a novel unified hybrid algorithm[J]. Proceedings of the CSEE,2014,34(4):635-643.
[10]柯圣舟,郑欢,林毅,等.计及柔性直流输电系统损耗模型的交直流电网无功优化[J].电网技术,2016(10):3052-3058.KE Shengzhou,ZHENG Huan,LIN Yi,et al. Reactive power optimization of AC/DC grid in consideration of VSCHVDC transmission loss model[J]. Power System Technology, 2016(10):3052-3058.
[11]王鹤,刘禹彤,李国庆,等.基于最优潮流的多端柔性直流输电系统控制策略[J].电力系统自动化,2017,41(11):150-155.WANG He, LIU Yutong, LI Guoqing, et al. Control strategy for VSC-based multi-terminal DC transmission system based on optimal power flow[J]. Automation of Electric Power Systems,2017,41(11):150-155.
[12]苗丹,刘天琪,王顺亮,等.含柔性直流电网的交直流混联系统潮流优化控制[J].电力系统自动化,2017,41(12):70-76.MIAO Dan, LIU Tianqi, WANG Shunliang, et al. Optimal control for power flow of AC/DC hybrid system with flexible DC grid[J]. Automation of Electric Power Systems,2017,41(12):70-76.
[13]尹青,杨洪耕,马晓阳.含大规模风电场的电网概率无功优化调度[J].电网技术,2017,41(2):514-520.YIN Qing, YANG Honggeng, MA Xiaoyang. Probabilistic optimal reactive power dispatch of power grid with largescale wind farm integration[J]. Power System Technology,2017,41(2):514-520.
[14]明杰,向红吉,戴朝华,等.大规模风电接人的运行场景无功优化评估[J].电网技术,2016,40(9):2737-2742.MING Jie, XIANG Hongji, DAI Chaohua, et al. Operation scenario reactive power optimization assessment with large-scale wind farm integration[J]. Power System Technology,2016,40(9):2737-2742.
[15]雷宇,杨明,韩学山.基于场景分析的含风电系统机组组合的两阶段随机优化[J].电力系统保护与控制,2012(23):58-67.LEI Yu, YANG Ming, HAN Xueshan. A two-stage stochastic optimization of unit commitment considering wind power based on scenario analysis[J]. Power System Protection and Control,2012(23):58-67.
[16]谭嫣.南澳柔性直流输电系统运行控制研究及应用[D].广州:华南理工大学,2015.