混合双馈入直流输电系统无功协调控制研究
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摘要
常规直流输电中常配置功能复杂的辅助无功控制,如Gamma-Kick和QPC功能,通过调节系统触发角、直流电压等运行参数,以牺牲系统特性为代价改善系统无功平衡;而柔性直流可实现有功和无功解耦控制,在输送直流功率的同时,仍具有灵活的无功输送能力。因此,在混合双馈入直流输电系统中,完全可以用柔性直流的无功协调控制功能取代常规直流辅助无功控制。以南方电网鲁西异步联网工程为研究对象,通过现场试验验证柔性直流输电无功协调功能代替常规直流辅助无功的可行性。此外,通过PSCAD/EMTDC仿真研究柔性直流无功协调功能对常规直流换相失败的影响,结果表明:灵活的柔性直流无功协调功能可以显著缩短常规直流换相失败时间,避免长时间换相失败引起的直流停运。
Traditionally, complex auxiliary reactive power control are usually used in LCC-HVDC, such as GammaKick and QPC, to improve system reactive power balance, by adjusting the operating parameters, include fire-angle and DC-voltage, but operating performance will be ingored. MMC-HVDC has the flexible reactive power control capability while delivering DC-power. Therefore, in hybrid double-fed HVDC system, The auxiliary reactive power control of LCC-HVDC can completely replaced by flexible reactive power control of MMC-HVDC. Research on Luxi asynchronous interconnection project of Southern Power Grid is done, reactive power coordinate of MMCHVDC replacing the auxiliary reactive power control in LCC-HVDC is verified to be practical. Further more,results of PSCAD/EMTDC simulation proved that flexible reactive power coordination function of MMC-HVDC can significantly shorten time of the commutation failure in LCC-HVDC, avoiding the shutting caused by long-time commutation failure in LCC-HVDC.
Traditionally, complex auxiliary reactive power control are usually used in LCC-HVDC, such as GammaKick and QPC, to improve system reactive power balance, by adjusting the operating parameters, include fire-angle and DC-voltage, but operating performance will be ingored. MMC-HVDC has the flexible reactive power control capability while delivering DC-power. Therefore, in hybrid double-fed HVDC system, The auxiliary reactive power control of LCC-HVDC can completely replaced by flexible reactive power control of MMC-HVDC. Research on Luxi asynchronous interconnection project of Southern Power Grid is done, reactive power coordinate of MMCHVDC replacing the auxiliary reactive power control in LCC-HVDC is verified to be practical. Further more,results of PSCAD/EMTDC simulation proved that flexible reactive power coordination function of MMC-HVDC can significantly shorten time of the commutation failure in LCC-HVDC, avoiding the shutting caused by long-time commutation failure in LCC-HVDC.
引文
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[2]周保荣,洪潮,饶宏,等.广东多直流输电换相失败对电网稳定运行的影响[J].南方电网技术,2017,11(3):18-24.ZHOU Baorong,HONG Chao,RAO Hong,et al.The influence of commutation failure of Guangdong multi-direct current transmission on stable operation of power grid[J].Southern Power Grid Technology,2017,11(3):18-24.
[3]林凌雪,张尧,钟庆,等.多馈入直流输电系统中换相失败研究综述[J].电网技术,2006,30(17):40-45.LIN Lingxue,ZHANG Yao,ZHONG Qing,et al.Summary of commutation failures in multiinfeed HVDC transmission systems[J].Power Grid Technology,2006,30(17):40-45.
[4]欧开健,任震,荆勇.直流输电系统换相失败的研究(一)换相失败的影响因素分析[J].电力自动化设备,2003,23(5):5-25.OU Kaijian,REN Zhen,JING Yong.Study on commutation failure of HVDC transmission system part I:analysis of factors affecting commutation failure[J].Electric Power Automation Equipment,2003,23(5):5-25.
[5]任景,李兴源,金小明,等.多馈入高压直流输电系统中逆变站滤波器投切引起的换相失败仿真研究[J].电网技术,2008,32(12):17-22.REN Jing,LI Xingyuan,JIN Xiaoming,et al.Simulation study on commutation failure caused by inverter station filter switching in multi-feed HVDC system[J].Power Grid Technology,2008,32(12):17-22.
[6]戴国安,周君文,王亚非.特高压直流输电系统无功控制策略研究[J].南方电网技术,2008,2(4):51-54.DAI Guoan,ZHOU Junwen,WANG Yafei.Research on reactive power control strategy of UHVDC transmission system[J].Southern Power Grid Technology,2008,2(4):51-54.
[7]徐政.柔性直流输电系统[M].北京:机械工业出版社,2012.
[8]任震,欧开健,荆勇.直流输电系统换相失败的研究(二)避免换相失败的措施[J].电力自动化设备,2003,23(6):6-9.REN Zhen,OU Kaijian,JING Hong.Study on commutation failure of HVDC transmission system part II:measures to avoid commutation failure[J].Electric Power Automation Equipment,2003,23(6):6-9.
[9]倪晓军,赵成勇,许韦华,等.降低直流输电换相失败概率的改进拓扑及其控制策略[J].中国电机工程学报,2015,35(4):811-820.NI Xiaojun,ZHAO Chengyong,XU Weihua,et al.Improved topology and control strategy for reducing commutation failure probability of HVDCtransmission[J].Journal of Electrical Engineering of China,2015,35(4):811-820.
[10]王艺璇.静止同步补偿器对降低对馈入直流换相失败的应用研究[D].济南:山东大学,2015.WANG Yixuan.Application of static synchronization compensator in reducing commutation failure of feedin DC[D].Jinan:Shandong University,2015.
[11]WANG Xuan,WANG Yuhong,YANHui,et al.Research on influences to reduce the commutation failure of different topology structures of STATCOM[J].2016 IEEE Transportation Electrification Conference and Expo,AsiaPacific(ITEC),2016,June 1-4:470-473.