南方电网技术2017，Vol.11Issue(7)：19-25,7.DOI:10.13648/j.cnki.issn1674-0629.2017.07.004
多端柔性直流输电系统滑模电流控制策略
Sliding-Mode Current Control Strategy for VSC-MTDC Systems
摘要
Abstract
In view of strong nonlinearity and uncertainty of VSC-MTDC systems, a novel sliding-mode current control strategy based on exponential reaching law is proposed.The inner loop current proportional integral ( PI) control is replaced by a sliding mode current control when the direct current control is used in HVDC converter stations, which reduces a PI controller compared to traditional double loop PI control and simplifies the parameter adjustment process of the system.A sliding-mode variable structure controller is estab-lished in which the errors of the d-axis current and q-axis current in inner loop are selected as a hyperplane in the rotating coordinate system, and the global stability of the control system is analyzed via Lyapunov function, the fast adjustment of power can be ensured when the converter station switches off because of fault, the stability of DC voltage can be maintained when the equivalent impedance of AC system changes.Finally, a multi-terminal HVDC transmission system connected to large offshore wind farms is built in PSCAD/EMTDC, the proposed control strategy is compared with traditional PI control strategy, and simulation results indicate that the proposed control strategy possesses good dynamic and steady state performances.关键词
多端柔性直流输电系统/滑模电流控制/李雅普诺夫函数Key words
VSC-MTDC systems/sliding mode current control/Lyapunov function分类
信息技术与安全科学引用本文复制引用
陈锐,张健,肖磊石,邵冰冰..多端柔性直流输电系统滑模电流控制策略[J].南方电网技术,2017,11(7):19-25,7.基金项目
广东电网公司科技项目(GDKJQQ20161198).Supported by the Science and Technology Project of Guangdong Power Grid (GDKJQQ20161198). （GDKJQQ20161198）
