低压限流环节优化控制策略综述
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摘要
目前高压直流工程上广泛使用的低压限流控制环节存在参数固定、有功和无功功率耦合等问题,导致高压直流的控制性能在系统故障恢复过程中没有得到充分发挥,因此需要对其进行改进以提升高压直流的控制性能。通过介绍传统低压限流控制环节的基本原理及缺陷,得到改进控制策略的两个主要优化方向:拐点参数优化与曲线线型优化。基于这两个优化方向,对现有低压限流优化控制策略进行总结归纳,包括拐点参数调整式、动态变结构式、交流母线电压与有功功率协调恢复式以及交直流电压相结合式。最后,指出当前优化方法存在的问题,并对今后的优化改进工作进行了展望。
At present,the voltage dependent current order limiter(VDCOL)widely used in high voltage direct current(HVDC)transmission projects have such problems as fixed parameters,active power and reactive power coupling.This results in the failure to make full use of HVDC control performance during the failure recovery process,so it is necessary to improve it to enhance the stability of the HVDC system.By analyzing the basic principles and defects of traditional VDCOL,two optimized directions of traditional VDCOL improvement strategy are obtained,which are the inflection point parameter optimization of VDCOL and the curve linear optimization of VDCOL.Based on these two optimized directions,the existing VDCOL optimization control strategies are summarized,including the adjustment of the inflection point,the dynamic variable structure,the AC bus voltage and the active power coordination recovery and the combination of AC and DC voltage.Finally,the problems existing in the current optimization methods are pointed out,as well as the optimization and improvement work in the future.
At present,the voltage dependent current order limiter(VDCOL)widely used in high voltage direct current(HVDC)transmission projects have such problems as fixed parameters,active power and reactive power coupling.This results in the failure to make full use of HVDC control performance during the failure recovery process,so it is necessary to improve it to enhance the stability of the HVDC system.By analyzing the basic principles and defects of traditional VDCOL,two optimized directions of traditional VDCOL improvement strategy are obtained,which are the inflection point parameter optimization of VDCOL and the curve linear optimization of VDCOL.Based on these two optimized directions,the existing VDCOL optimization control strategies are summarized,including the adjustment of the inflection point,the dynamic variable structure,the AC bus voltage and the active power coordination recovery and the combination of AC and DC voltage.Finally,the problems existing in the current optimization methods are pointed out,as well as the optimization and improvement work in the future.
引文
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[14]胡松伶,王渝红,李兴源.有利于多馈入系统恢复的自适应变结构VDCOL控制[J].高压电器,2016(5):90-95.HU Songling,WANG Yuhong,LI Xingyuan.Adaptive variable structure VDCOL control strategy for coordinated recovery of MIDC system[J].High Voltage Apparatus,2016(5):90-95.
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[19]李瑶佳,汪娟娟,李子林,等.考虑高压直流输电系统无功特性的低压限流参数设置[J].电力系统保护与控制,2017,45(16):16-23.LI Yaojia,WANG Juanjuan,LI Zilin,et al.VDCOL parameters setting influenced by reactive power characteristics of HVDC system[J].Power System Protection and Control,2017,45(16):16-23.
[20]张彪,王渝红,李兴源.改善直流系统恢复特性的VDCOL控制策略研究综述[J].华东电力,2014,42(5):826-832.ZHANG Biao,WANG Yuhong,LI Xingyuan.Review of VDCOL control strategy for improving DC System recovery characteristics[J].East China Electric Power,2014,42(5):826-832.
[21]冀肖彤.抑制HVDC送端交流暂态过电压的控制系统优化[J].电网技术,2017,41(3):721-728.JI Xiaotong.Optimization of HVDC control system for mitigating AC transient overvoltage on rectifier station[J].Power System Technology,2017,41(3):721-728.
[22]郑超,盛灿辉,林俊杰,等.特高压直流输电系统动态响应对受端交流电网故障恢复特性的影响[J].高电压技术,2013,41(3):555-561.ZHENG Chao,SHENG Canhui,LIN Junjie,et al.Influence of of UHVDC transmission system dynamic response on AC receive ending’s fault recovery characteristic[J].High Voltage Engineering,2013,41(3):555-561.
[23]冯明,李兴源,李妮,等.基于Simplex算法的高压直流输电分段变速率VDCOL研究[J].四川大学学报,2015,47(4):162-167.FENG Ming,LI Xingyuan,LI Ni,et al.Study of HVDC piecewise variable rate VDCOL based on simplex algorithm[J].Journal of Sichuan University(Eengineering Science Edition),2015,47(4):162-167.
[24]郑超,汤涌,马世英,等.直流整流站动态无功特性解析及优化措施[J].中国电机工程学报,2014,34(28):4886-4896.ZHENG Chao,TANG Yong,MA Shiying,et al.Study on the dynamic reactive power characteristic of HVDC rectifier stations and optimization measures[J].Proceedings of the CSEE,2014,34(28):4886-4896.
[25]付颖,罗隆福,童泽,等.直流输电控制器低压限流环节的研究[J].高电压技术,2008,34(6):1110-1114.FU Ying,LUO Longfu,TONG Ze,et al.Study on voltage dependent current order limiter of hvdc transmission system’s controller[J].High Voltage Engineering,2008,34(6):1110-1114.
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