基于直流频率限制控制器的超低频振荡抑制方案
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摘要
随着鲁西背靠背以及渝鄂背靠背工程的相继推进,异步联网后送端电网出现的超低频振荡威胁着系统的稳定运行。针对异步联网后的多直流送出系统,分析了超低频振荡产生原因及直流频率限制器(FLC)抑制超低频振荡的机理。结合直流FLC影响因子和直流控制敏感度提出了一种考虑送端电网水电分布的直流排序方法。并据此提出了一种的超低频振荡抑制方案,该方案利用最小二乘法–旋转不变技术的信号参数估计算法和改进粒子群优化算法,将多直流优化问题转化为多个单直流顺序循环优化问题,以实现对超低频振荡较好的抑制。最后以渝鄂异步联网后的川渝电网为算例,仿真验证了所提方案的有效性。
With the developmment of Luxi Back-to-Back HVDC project and Yu'e Back-to-Back HVDC project, ultra-low frequency oscillation becomes a serious threat to the stability of power system. For an asynchronous interconnection multi-send HVDC system, the mechanism of ultra-low frequency oscillation and suppressing ultra-low frequency oscillation by FLC(frequency limit controller) is analyzed. Considering the distribution of hydropower in the sending end, a new DC sorting method is proposed, which combines the influences of DC power change on AC system and sensitivity of ultra-low frequency oscillation mode. Based on the results above, a new suppression scheme is proposed. In order to achieve a better suppression effect, the multi DC optimization problem is transformed into multiple single-DC sequential optimization problems in the scheme by TLS-ESPRIT(total least squares-estimation of signal parameters via rotational invariance techniques) and improved PSO(particle swarm optimization). Finally, the effectiveness of the scheme is verified by simulation results of Sichuan-Chongqing power system which already has an asynchronous interconnection with Hubei power system.
With the developmment of Luxi Back-to-Back HVDC project and Yu'e Back-to-Back HVDC project, ultra-low frequency oscillation becomes a serious threat to the stability of power system. For an asynchronous interconnection multi-send HVDC system, the mechanism of ultra-low frequency oscillation and suppressing ultra-low frequency oscillation by FLC(frequency limit controller) is analyzed. Considering the distribution of hydropower in the sending end, a new DC sorting method is proposed, which combines the influences of DC power change on AC system and sensitivity of ultra-low frequency oscillation mode. Based on the results above, a new suppression scheme is proposed. In order to achieve a better suppression effect, the multi DC optimization problem is transformed into multiple single-DC sequential optimization problems in the scheme by TLS-ESPRIT(total least squares-estimation of signal parameters via rotational invariance techniques) and improved PSO(particle swarm optimization). Finally, the effectiveness of the scheme is verified by simulation results of Sichuan-Chongqing power system which already has an asynchronous interconnection with Hubei power system.
引文
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[16]陈实,李兴源,赵睿,等.基于控制敏感因子的PSS和直流附加控制的协调阻尼控制[J].高电压技术,2014,40(11):3577-3583.CHEN Shi,LI Xingyuan,ZHAO Rui,et al.Coordination research of PSS and HVDC damping control based on control sensitive factor[J].High Voltage Engineering,2014,40(11):3577-3583.
[17]曾琦,李兴源,冯明,等.基于广域测量系统的多馈入直流低压限流单元的协调控制方法[J].高电压技术,2017,43(4):1168-1174.ZENG Qi,LI Xingyuan,FENG Ming,et al.Coordinated control method of VDCOLs in MIDC system based on the wide-area measurement system[J].High Voltage Engineering,2017,43(4):1168-1174.
[18]邱晓燕,沙熠,宁雪姣,等.大规模风电接入的智能电网多类型柔性负荷分级优化调度[J].高电压技术,2016,42(7):2084-2091.QIU Xiaoyan,SHA Yi,NING Xuejiao,et al.Hierarchical optimization of multi-type flexible load in smart grid with large-scale wind generation[J].High Voltage Engineering,2016,42(7):2084-2091.
[2]张东辉,洪潮,周保荣,等.云南电网与南方电网主网异步联网系统方案研究[J].南方电网技术,2014,8(6):1-6.ZHANG Donghui,HONG Chao,ZHOU Baorong,et al.Asynchronous interconnection system scheme for Yunnan Power Grid and the main grid of China Southern Power Grid[J].Southern Power System Technology,2014,8(6):1-6.
[3]华中电网有限公司.华中电网“十二五”发展规划[R].武汉:华中电网有限公司,2011.Huazhong Power Grid Co.,Ltd.Development plan of Huazhong Power Grid during the 12th five-year plan[R].Wuhan,China:Huazhong Power Grid Co.,Ltd.,2011.
[4]付超,柳勇军,涂亮,等.云南电网与南方电网主网异步联网系统试验分析[J].南方电网技术,2016,10(7):1-5.FU Chao,LIU Yongjun,TU Liang,et al.Experiment and an analysis on asynchronously interconnected system of Yunnan Power Grid and main grid of China Southern Power Grid[J].Southern Power System Technology,2016,10(7):1-5.
[5]刘春晓,张俊峰,陈亦平,等.异步联网方式下云南电网超低频振荡的机理分析与仿真[J].南方电网技术,2016,10(7):29-34.LIU Chunxiao,ZHANG Junfeng,CHEN Yiping et al.Mechanism analysis and simulation on ultra-low frequency oscillation of Yunnan Power Grid in asynchronous interconnection mode[J].Southern Power System Technology,2016,10(7):29-34.
[6]王官宏,于钊,张怡,等.电力系统超低频率振荡模式排查及分析[J].电网技术,2016,40(8):2324-2329.WANG Guanhong,YU Zhao,ZHANG Yi,et al.Troubleshooting and analysis of ultra-low frequency oscillation mode in power system[J].Power System Technology,2016,40(8):2324-2329.
[7]路晓敏,陈磊,陈亦平,等.电力系统一次调频过程的超低频振荡分析[J].电力系统自动化,2017,41(16):64-70.LU Xiaomin,CHEN Lei,CHEN Yiping,et al.Ultra-low-frequency oscillation of power system primary frequency regulation[J].Automation of Electric Power Systems,2017,41(16):64-70.
[8]陈磊,路晓敏,陈亦平,等.多机系统超低频振荡分析与等值方法[J].电力系统自动化,2017,41(22):10-15.CHEN Lei,LU Xiaomin,CHEN Yiping,et al.Analysis of ultra-low-frequency oscillations in multi-machine system and equivalent method[J].Automation of Electric Power Systems,2017,41(22):10-15.
[9]周靖皓,江崇熙,甘德强,等.基于值集法对云南电网超低频振荡的稳定分析[J].电网技术,2017,41(10):3147-3152.ZHOU Jinghao,JIANG Chongxi,GAN Deqiang,et al.Stability analysis of ultra-low frequency oscillation of Yunnan power grid based on value set approach[J].Power System Technology,2017,41(10):3147-3152.
[10]廖梦君,郭琪,李鹏,等.基于RTDS的云南电网与南方电网主网异步联网运行控制特性分析[J].南方电网技术,2016,10(7):40-44.LIAO Mengjun,GUO Qi,LI Peng,et al.RTDS based analysis on operation-control characteristics of asynchronous interconnected Yunnan Power Grid and the main grid of China Southern Power Grid[J].Southern Power System Technology,2016,10(7):40-44.
[11]张建新,刘春晓,陈亦平,等.异步联网方式下云南电网超低频振荡的抑制措施与试验[J].南方电网技术,2016,10(7):35-39.ZHANG Jianxin,LIU Chunxiao,CHEN Yiping et al.Countermeasures and experiments on ultra-low frequency oscillation of Yunnan Power Grid in asynchronous interconnection mode[J].Southern Power System Technology,2016,10(7):35-39.
[12]陈磊,路晓敏,陈亦平,等.利用暂态能量流的超低频振荡在线分析与紧急控制方法[J].电力系统自动化,2017,41(17):9-14.CHEN Lei,LU Xiaomin,CHEN Yiping,et al.Online analysis and emergency control of ultra-low-frequency oscillations using transient energy flow[J].Automation of Electric Power Systems,2017,41(17):9-14.
[13]陈亦平,程哲,张昆,等.高压直流输电系统孤岛运行调频策略[J].中国电机工程学报,2013,33(4):96-102.CHEN Yiping,CHENG Zhe,ZHANG Kun,et al.Frequency regulation strategy for islanding operation of HVDC[J].Proceedings of the CSEE,2013,33(4):96-102.
[14]周登波,何园峰,龙建华,等.云南异步联网方式下普侨特高压直流系统FLC功能的动作特性[J].高电压技术,2016,42(14):184-187.ZHOU Dengbo,HE Yuanfeng,LONG Jianhua,et al.The FLC function characteristics of Pu-Qiao UHVDC system of Yunnan Power Grid in asynchronous interconnection mode[J].High Voltage Engineering,2016,42(14):184-187.
[15]马秉伟,周莉.基于TLS-ESPRIT算法和支持向量机的间谐波检测[J].高电压技术,2009,35(6):1468-1471.MA Bingwei,ZHOU Li.Interharmonics detection based on TLS-ESPRIT and SVM algorithm[J].High Voltage Engineering,2009,35(6):1468-1471
[16]陈实,李兴源,赵睿,等.基于控制敏感因子的PSS和直流附加控制的协调阻尼控制[J].高电压技术,2014,40(11):3577-3583.CHEN Shi,LI Xingyuan,ZHAO Rui,et al.Coordination research of PSS and HVDC damping control based on control sensitive factor[J].High Voltage Engineering,2014,40(11):3577-3583.
[17]曾琦,李兴源,冯明,等.基于广域测量系统的多馈入直流低压限流单元的协调控制方法[J].高电压技术,2017,43(4):1168-1174.ZENG Qi,LI Xingyuan,FENG Ming,et al.Coordinated control method of VDCOLs in MIDC system based on the wide-area measurement system[J].High Voltage Engineering,2017,43(4):1168-1174.
[18]邱晓燕,沙熠,宁雪姣,等.大规模风电接入的智能电网多类型柔性负荷分级优化调度[J].高电压技术,2016,42(7):2084-2091.QIU Xiaoyan,SHA Yi,NING Xuejiao,et al.Hierarchical optimization of multi-type flexible load in smart grid with large-scale wind generation[J].High Voltage Engineering,2016,42(7):2084-2091.