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。
A muhiport 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.
出处
《电力系统自动化》
EI
CSCD
北大核心
2017年第10期51-57,共7页
Automation of Electric Power Systems
基金
中国博士后科学基金资助项目(2015M582543)~~
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
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 currentvoltage droop control
