This paper presents a novel conditionally suboptimal filtering algorithm on estimation problems that arise in discrete nonlinear time-varying stochastic difference systems. The suboptimal state estimate is formed by s...This paper presents a novel conditionally suboptimal filtering algorithm on estimation problems that arise in discrete nonlinear time-varying stochastic difference systems. The suboptimal state estimate is formed by summing of conditionally nonlinear filtering estimates that their weights depend only on time instants, in contrast to conditionally optimal filtering, the proposed conditionally suboptimal filtering allows parallel processing of information and reduce online computational requirements in some nonlinear stochastic difference system. High accuracy and efficiency of the conditionally suboptimal nonlinear filtering are demonstrated on a numerical example.展开更多
介绍了统一电能质量调节器(Unified Power Quality Conditioner,简称UPQC)的传统拓扑结构,设计并实现了基于直流隔离单元(DC Isolation,简称DCI)的新型DCI-UPQC实验样机。与UPQC传统拓扑中串联补偿侧的隔离变压器不同,DCI-UPQC直流单元...介绍了统一电能质量调节器(Unified Power Quality Conditioner,简称UPQC)的传统拓扑结构,设计并实现了基于直流隔离单元(DC Isolation,简称DCI)的新型DCI-UPQC实验样机。与UPQC传统拓扑中串联补偿侧的隔离变压器不同,DCI-UPQC直流单元各组电容之间分时控制的电气开关起到了电气隔离的作用,避免了隔离变压器带来的多种缺陷。阐述了DCI-UPQC的基本原理,给出了DCI-UPQC串联补偿单元动态电压恢复器(Dynamic VoltageRestorer,简称DVR),并联补偿单元有源滤波器(Active Power Filter,简称APF)以及DCI单元的控制策略。同时,开发了一套适用于电力电子装置的基于数字信号处理器(Digital Signal Processor,简称DSP)和(Field Programmable GateArray,简称FPGA)的先进数字控制平台,成功地将其应用于DCI-UPQC样机。实验结果表明,该样机在具有电压稳态和动态补偿功能的同时,亦可补偿负荷所需的无功和谐波电流,有效地验证了DCI拓扑结构和控制策略的可行性。展开更多
文摘This paper presents a novel conditionally suboptimal filtering algorithm on estimation problems that arise in discrete nonlinear time-varying stochastic difference systems. The suboptimal state estimate is formed by summing of conditionally nonlinear filtering estimates that their weights depend only on time instants, in contrast to conditionally optimal filtering, the proposed conditionally suboptimal filtering allows parallel processing of information and reduce online computational requirements in some nonlinear stochastic difference system. High accuracy and efficiency of the conditionally suboptimal nonlinear filtering are demonstrated on a numerical example.
文摘介绍了统一电能质量调节器(Unified Power Quality Conditioner,简称UPQC)的传统拓扑结构,设计并实现了基于直流隔离单元(DC Isolation,简称DCI)的新型DCI-UPQC实验样机。与UPQC传统拓扑中串联补偿侧的隔离变压器不同,DCI-UPQC直流单元各组电容之间分时控制的电气开关起到了电气隔离的作用,避免了隔离变压器带来的多种缺陷。阐述了DCI-UPQC的基本原理,给出了DCI-UPQC串联补偿单元动态电压恢复器(Dynamic VoltageRestorer,简称DVR),并联补偿单元有源滤波器(Active Power Filter,简称APF)以及DCI单元的控制策略。同时,开发了一套适用于电力电子装置的基于数字信号处理器(Digital Signal Processor,简称DSP)和(Field Programmable GateArray,简称FPGA)的先进数字控制平台,成功地将其应用于DCI-UPQC样机。实验结果表明,该样机在具有电压稳态和动态补偿功能的同时,亦可补偿负荷所需的无功和谐波电流,有效地验证了DCI拓扑结构和控制策略的可行性。