文章摘要
金阳忻,徐习东.直流配电网失压时测量误差对暂态稳定性的影响分析[J].电力系统自动化,2019,43(12):143-149. DOI: 10.7500/AEPS20181130009.
JIN Yangxin,XU Xidong.Impact of Measurement Error on Transient Stability in DC Distribution Network with Voltage Drop[J].Automation of Electric Power Systems,2019,43(12):143-149. DOI: 10.7500/AEPS20181130009.
直流配电网失压时测量误差对暂态稳定性的影响分析
Impact of Measurement Error on Transient Stability in DC Distribution Network with Voltage Drop
DOI:10.7500/AEPS20181130009
关键词: 直流配电网  测量误差  暂态稳定性  稳定裕度  换流站输出功率  灵敏度分析
KeyWords: DC distribution network  measurement error  transient stability  stability margin  power output of converter station  sensitivity analysis
上网日期:2019-04-03
基金项目:国家高技术研究发展计划(863计划)资助项目(2015AA050104)
作者单位E-mail
金阳忻 国网浙江省电力有限公司电力科学研究院计量中心, 浙江省杭州市 310014 1073323678@qq.com 
徐习东 浙江大学电气工程学院, 浙江省杭州市 310027  
摘要:
      直流配电网失压时为恢复电压换流站需输出尽可能多的功率,系统暂态稳定性处于临界状态,易受到测量误差的影响而失稳。为定量分析这种影响,针对计及测量误差的换流站本地控制,研究了电流内环控制精度的削弱和功率外环给出电流参考值的偏移,并据此提出了参考值保留裕度的修正方法,以避免其超出稳定范围。在此基础上,得到了换流站输出功率关于测量误差的灵敏度,用于估算恢复系统电压所需功率的损失。最后,通过PSCAD/EMTDC时域仿真对测量准确度与系统暂态稳定性之间的联系进行了验证,得到了预期的结果。
Abstract:
      When voltage drop occurs in DC distribution network, the converter station should output power as much as possible, so as to recover the voltage. Thus, the system transient stability is critical, which is likely to lose stability because of measurement error. In order to analyze the effect, the measurement errors are considered in the local control. Then this paper analyzes the accuracy weakness of current inner loop control, and the deviation of current references provided by power outer loop. Accordingly, the strategy of reserving margin for the current reference is indicated to limit it in the stability range. Furthermore, the sensitivity of converter station power output to measurement error is deduced to estimate the loss of power required to recover the system voltage. Finally, the linkage between system transient stability and measurement accuracy is verified by time domain simulation on PSCAD/EMTDC, and the expected results are obtained.
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