This paper presents a linear matrix inequality （LMI） approach to solve the fault-tolerant control （FTC） problem of actuator faults. The range of actuator faults is considered as a parameter region and subdivided i...This paper presents a linear matrix inequality （LMI） approach to solve the fault-tolerant control （FTC） problem of actuator faults. The range of actuator faults is considered as a parameter region and subdivided into several subregions to achieve a certain desired performance specification. Based on the integral quadratic constraint （IQC） approach, a passive fault-tolerant controller for the whole fault region and multiple fault-tolerant controllers for each fault subregion are designed for guaranteeing stability and improving performance of the FTC system, respectively. According to the estimation of parameters by FDI process, the corresponding subregion controller is chosen for the stability and optimal performance of closed-loop systems when the fault occurs. The case of incorrect estimation is also considered by comparing the performance index between the switched controller and the passive fault-tolerant controller. The proposed design technique is finally evaluated in the light of a simulation example.展开更多
Multilevel inverters are used in many industrial applications because of good power quality, minimum losses and less harmonics contents. Multilevel inverters require no series connected synchronized switching devices,...Multilevel inverters are used in many industrial applications because of good power quality, minimum losses and less harmonics contents. Multilevel inverters require no series connected synchronized switching devices, transformer and complex filters. In this paper 10, 18, 24 diode clamped multi-level inverters (DCMLI) are implemented using trust region dog leg optimization method to find the optimized values of switching angles (θ). It decreases the total harmonic distortion (THD) of the output voltages and to reduce the complexity of external filter required. The multi-level inverters are implemented in MATLAB Simulation and results are compared in terms of harmonics, system complexity and efficiency.展开更多
针对常规备自投装置不能实现链式结构串供的多个110 k V变电站中非开环点变电站在失电时的快速恢复供电问题,提出了一种适用于常规和智能化变电站,基于区域电网实时全景信息的区域备自投新方案。具体介绍了区域备自投原理和实现方案,以...针对常规备自投装置不能实现链式结构串供的多个110 k V变电站中非开环点变电站在失电时的快速恢复供电问题,提出了一种适用于常规和智能化变电站,基于区域电网实时全景信息的区域备自投新方案。具体介绍了区域备自投原理和实现方案,以及其与站域备自投、常规备自投、区域保护、区域稳控的关系等。RTDS试验及现场工程应用表明,所提出的区域备自投性能优越,能够实现区域电网发生故障时的快速恢复供电。展开更多
考虑到各种开关在配电网故障时呈现的开断特性不同,提出基于开关特性的配电网可靠性等效叠加评估算法。该算法在网络分区及区域最小路矩阵形成过程中将元件可靠性指标等效叠加于开关,获得开关等效可靠性矩阵;以开关为分析对象,根据区域...考虑到各种开关在配电网故障时呈现的开断特性不同,提出基于开关特性的配电网可靠性等效叠加评估算法。该算法在网络分区及区域最小路矩阵形成过程中将元件可靠性指标等效叠加于开关,获得开关等效可靠性矩阵;以开关为分析对象,根据区域最小路矩阵和开关等效可靠性矩阵计算负荷点可靠性指标。IEEE RBTS Bus 2、4、6测试系统计算结果表明所提方法能够避免冗余分析、减少计算量,有力提升了计算速度和效率。展开更多
基金partly supported by the Program for New Century Excellent Talents in University (No.NCET-04-0283)the Funds for Creative Research Groups of China (No.60521003)+4 种基金Program for Changjiang Scholars and Innovative Research Team in University (No.IRT0421)the State Key Program of National Natural Science of China (No.60534010)the Funds of National Science of China (No.60674021)the Funds of PhD program of MOE,China (No.20060145019)the 111 Project (No.B08015)
文摘This paper presents a linear matrix inequality （LMI） approach to solve the fault-tolerant control （FTC） problem of actuator faults. The range of actuator faults is considered as a parameter region and subdivided into several subregions to achieve a certain desired performance specification. Based on the integral quadratic constraint （IQC） approach, a passive fault-tolerant controller for the whole fault region and multiple fault-tolerant controllers for each fault subregion are designed for guaranteeing stability and improving performance of the FTC system, respectively. According to the estimation of parameters by FDI process, the corresponding subregion controller is chosen for the stability and optimal performance of closed-loop systems when the fault occurs. The case of incorrect estimation is also considered by comparing the performance index between the switched controller and the passive fault-tolerant controller. The proposed design technique is finally evaluated in the light of a simulation example.
文摘Multilevel inverters are used in many industrial applications because of good power quality, minimum losses and less harmonics contents. Multilevel inverters require no series connected synchronized switching devices, transformer and complex filters. In this paper 10, 18, 24 diode clamped multi-level inverters (DCMLI) are implemented using trust region dog leg optimization method to find the optimized values of switching angles (θ). It decreases the total harmonic distortion (THD) of the output voltages and to reduce the complexity of external filter required. The multi-level inverters are implemented in MATLAB Simulation and results are compared in terms of harmonics, system complexity and efficiency.
文摘针对常规备自投装置不能实现链式结构串供的多个110 k V变电站中非开环点变电站在失电时的快速恢复供电问题,提出了一种适用于常规和智能化变电站,基于区域电网实时全景信息的区域备自投新方案。具体介绍了区域备自投原理和实现方案,以及其与站域备自投、常规备自投、区域保护、区域稳控的关系等。RTDS试验及现场工程应用表明,所提出的区域备自投性能优越,能够实现区域电网发生故障时的快速恢复供电。
文摘考虑到各种开关在配电网故障时呈现的开断特性不同,提出基于开关特性的配电网可靠性等效叠加评估算法。该算法在网络分区及区域最小路矩阵形成过程中将元件可靠性指标等效叠加于开关,获得开关等效可靠性矩阵;以开关为分析对象,根据区域最小路矩阵和开关等效可靠性矩阵计算负荷点可靠性指标。IEEE RBTS Bus 2、4、6测试系统计算结果表明所提方法能够避免冗余分析、减少计算量,有力提升了计算速度和效率。
