电压源换流器型直流输电(voltage source converter based high voltage direct current,VSC-HVDC)可用于联接弱交流系统,但其联于弱交流系统时的运行特性仍待深入研究。该文以VSC的交流侧稳态潮流方程为基础,归纳两种不同控制方式下VS...电压源换流器型直流输电(voltage source converter based high voltage direct current,VSC-HVDC)可用于联接弱交流系统,但其联于弱交流系统时的运行特性仍待深入研究。该文以VSC的交流侧稳态潮流方程为基础,归纳两种不同控制方式下VSC稳态运行时的交流侧安全稳定性约束条件,分析安全稳定判据随短路比(short-circuit ratio,SCR)的变化规律,解释VSC联于弱交流系统时无法安全稳定运行的现象,并给出求取临界短路比(critical short-circuit ratio,CSCR)的步骤流程。在此基础上,研究各种工况因素(交流等效电动势、交流等效系统阻抗、VSC运行方式等)不同时VSC的CSCR,并和PSCAD的仿真结果进行对比验证。最后,总结VSC的CSCR的主要制约因素,并给出各种运行方式下CSCR的典型范围。展开更多
混合双馈入直流输电系统中电网换相换流器高压直流输电(line commutated converter based high voltage directcurrent,LCC-HVDC)子系统对电压源换流器高压直流输电(voltage source converter based high voltage direct current,VSC-HV...混合双馈入直流输电系统中电网换相换流器高压直流输电(line commutated converter based high voltage directcurrent,LCC-HVDC)子系统对电压源换流器高压直流输电(voltage source converter based high voltage direct current,VSC-HVDC)子系统运行特性的影响机理有待深入研究。首先建立了基于不同LCC-HVDC子系统控制模式的混合双馈入直流输电系统数学模型,并分析归纳了VSC-HVDC子系统的安全稳定运行约束条件和判据,提出了一种确定混合双馈入直流系统中VSC-HVDC子系统稳态运行区域的计算方法。在此基础上对比分析了VSC-HVDC子系统稳态运行区域与LCC-HVDC子系统控制模式、交流系统短路比、LCC-HVDC与VSC-HVDC容量配比之间的关系。最后,基于PSCAD/EMTDC软件搭建了混合双馈入直流系统仿真模型,仿真验证了VSC-HVDC子系统稳态运行区域计算方法的有效性。展开更多
This paper presents an improved method for H-two control with regional stability constraints for the closedloop system. The controller is given by the convex combination of a set of fixed gains. Both continuous and di...This paper presents an improved method for H-two control with regional stability constraints for the closedloop system. The controller is given by the convex combination of a set of fixed gains. Both continuous and discrete-time systems in a known polytopic domain are investigated. New LMI-based sufficient conditions for the existence of parameterdependent Lyapunov functions are proposed. Numerical examples are given to show the proposed conditions provide useful and less conservative results for the problems of H-two control with regional stability constraints.展开更多
文摘电压源换流器型直流输电(voltage source converter based high voltage direct current,VSC-HVDC)可用于联接弱交流系统,但其联于弱交流系统时的运行特性仍待深入研究。该文以VSC的交流侧稳态潮流方程为基础,归纳两种不同控制方式下VSC稳态运行时的交流侧安全稳定性约束条件,分析安全稳定判据随短路比(short-circuit ratio,SCR)的变化规律,解释VSC联于弱交流系统时无法安全稳定运行的现象,并给出求取临界短路比(critical short-circuit ratio,CSCR)的步骤流程。在此基础上,研究各种工况因素(交流等效电动势、交流等效系统阻抗、VSC运行方式等)不同时VSC的CSCR,并和PSCAD的仿真结果进行对比验证。最后,总结VSC的CSCR的主要制约因素,并给出各种运行方式下CSCR的典型范围。
文摘混合双馈入直流输电系统中电网换相换流器高压直流输电(line commutated converter based high voltage directcurrent,LCC-HVDC)子系统对电压源换流器高压直流输电(voltage source converter based high voltage direct current,VSC-HVDC)子系统运行特性的影响机理有待深入研究。首先建立了基于不同LCC-HVDC子系统控制模式的混合双馈入直流输电系统数学模型,并分析归纳了VSC-HVDC子系统的安全稳定运行约束条件和判据,提出了一种确定混合双馈入直流系统中VSC-HVDC子系统稳态运行区域的计算方法。在此基础上对比分析了VSC-HVDC子系统稳态运行区域与LCC-HVDC子系统控制模式、交流系统短路比、LCC-HVDC与VSC-HVDC容量配比之间的关系。最后,基于PSCAD/EMTDC软件搭建了混合双馈入直流系统仿真模型,仿真验证了VSC-HVDC子系统稳态运行区域计算方法的有效性。
基金This work was supported by the Science Foundation of Education Commission of Hubei Province(No.D200613002)the Doctoral Pre-ResearchFoundation of Three Gorges University.
文摘This paper presents an improved method for H-two control with regional stability constraints for the closedloop system. The controller is given by the convex combination of a set of fixed gains. Both continuous and discrete-time systems in a known polytopic domain are investigated. New LMI-based sufficient conditions for the existence of parameterdependent Lyapunov functions are proposed. Numerical examples are given to show the proposed conditions provide useful and less conservative results for the problems of H-two control with regional stability constraints.
