文章摘要
胡益,王晓茹,滕予非,等.多端电压源型直流互联系统频率稳定性控制策略[J].电力系统自动化,2017,41(10):51-57. DOI: 10.7500/AEPS20160727013.
HU Yi,WANG Xiaoru,TENG Yufei, et al.Frequency Stability Control Strategy for Voltage Source Converter Based Multi-terminal Direct Current Interconnected System[J].Automation of Electric Power Systems,2017,41(10):51-57. DOI: 10.7500/AEPS20160727013.
多端电压源型直流互联系统频率稳定性控制策略
Frequency Stability Control Strategy for Voltage Source Converter Based Multi-terminal Direct Current Interconnected System
DOI:10.7500/AEPS20160727013
关键词: 电压源型换流器  多端直流互联系统  频率调节  反馈线性化H∞方法  单纯形法  直流功率分配系数  最优直流电压斜率控制
KeyWords: voltage source converter(VSC)  multi-terminal direct current interconnected system  frequency regulation  feedback linearization H∞ method  simplex method  direct current power distribution coefficient  optimal direct current voltage droop control
上网日期:2017-04-05
基金项目:中国博士后科学基金资助项目(2015M582543)
作者单位E-mail
胡益 西南交通大学电气工程学院, 四川省成都市 610031 huangganghuyi@163.com 
王晓茹 西南交通大学电气工程学院, 四川省成都市 610031  
滕予非 国网四川省电力公司电力科学研究院, 四川省成都市 610072  
韩润 西南交通大学电气工程学院, 四川省成都市 610031  
摘要:
      以提高电压源型换流器多端直流互联系统的频率稳定性为目的,提出了一种适用于多孤岛电网换流站共同参与主网频率调节的多端协调控制策略。该控制策略首先是根据互联系统的数学模型,利用非线性鲁棒控制中的反馈线性化H∞方法设计出了各孤岛电网换流站直流功率调节量的控制律。然后考虑各孤岛电网自身频率波动情况,利用单纯形法滚动优化直流功率调节量控制律中的直流功率分配系数,从而得到最优分配的直流功率调节量,保证了各换流站以最优直流电压斜率控制协调参与主电网的频率稳定调节过程。最后,在PSCAD/EMTDC中以三端柔性直流互联系统为例,通过与常规控制策略进行对比仿真,验证了所提控制策略的正确性和优越性。
Abstract:
      A multiport coordinated control strategy is proposed for multi-island grid converter station to participate in the main grid frequency stability regulation to heighten the frequency stability of voltage source converter based multi-terminal direct current(VSC-MTDC)system. According to the mathematical model of the interconnected system, this strategy has to design a control law for the direct current(DC)power regulatory amount of each island grid converter using the feedback linearization H∞ method in nonlinear robust control. Secondly, in consideration of the frequency fluctuations of each island grid, this strategy uses the simplex method to optimize the DC power distribution coefficient for the control rate of DC power adjustment amount, thereby obtaining the DC power adjustment amount of optimal allocation and ensuring coordinated participation by all island grids in the main grid frequency stability adjustment process with optimal DC voltage droop control. Finally, a three-terminal VSC-MTDC system is set up on PSCAD/EMTDC. Comparison of simulation results with those of conventional control strategy shows the correctness and superiority of the proposed control strategy. This work is supported by Post-doctoral Science Foundation of China(No. 2015M582543).
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