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基于电流畸变特性的整流器开路故障诊断系统设计与实现
电压源整流器 在线故障诊断 多开关开路故障 电流失真
2024/3/11
半导体开关是影响电压源整流器VSR（voltage source rectifier）系统整体故障率的重要因素。为此,提出一种基于电流畸变特性的三相开路故障诊断系统,该系统由诊断模块、寄存器模块和决策模块组成。诊断模块使用滞环比较器来判断电流的变化趋势,从而诊断开路OC（open-circuit）故障;寄存器模块用于实现多开关OC故障诊断;决策模块用于输出最终结果。实验结果表明,该方法能够正确实现...
作为各种新能源发电设备和驱动系统的核心部分,逆变器的安全性和可靠性对整个系统的安全稳定运行至关重要。近年来,高电压等级、高功率密度和高集成化的逆变器已成发展趋势,但增加更多的开关器件也会增大其故障概率,因此,采取快速有效的方法对逆变器的故障进行诊断十分重要。针对逆变器功率管故障诊断,目前的分类方法主要分为基于解析模型、基于信号处理和基于数据驱动3种。
消费品质量安全风险信息管理系列标准解读
消费品 质量安全风险信息管理系列 风险信息采集
2022/6/21
当前，我国社会经济进入转型发展时期，由数量增长阶段进入了高质量发展阶段，党中央、国务院高度重视消费品质量安全工作。2012年国务院颁布的《质量发展纲要（2011-2020年）》明确提出“搭建产品质量安全信息收集网络，建立产品质量安全信息舆情监控系统”。《消费品标准和质量提升规划（2016-2020年）》（国办发〔2016〕68号）也明确提出，“要以早发现、早研判、早预警、早处置为目标，推进建立以风...
α-淀粉酶催化甜菊糖的改性研究
甜菊糖 高峰淀粉酶 可溶性淀粉 酶法改性
2019/3/19
在本文中，通过筛选三种α-淀粉酶，以甜菊苷的转化率为指标，选用一种耐酸性的中温α-淀粉酶，其商品名称为高峰淀粉酶，将供体可溶性淀粉水解为葡萄糖基引入甜菊苷中对甜菊糖进行酶法改性以改善其味质。经试验后，对酶法催化工艺进行优化，最佳工艺条件为：供体淀粉浓度为100 g/L，底物比例(甜菊糖:淀粉)为1:10 (m/m)，反应温度为60 ℃，加酶量为1.5 U/mL。改性后的甜菊糖产品采用高效液相色谱(...
Global Optimization in Control System Analysis and Design
Global Optimization Control System Analysis Design
2015/7/13
We present branch and bound algorithms for the computation of several important quantities (best- and worst-case norms and best- and worst-case state decay rates) that arise in the analysis and design...
Robust Control Tools:Graphical User-Interfaces and LMI Algorithms
Robust Control Tools Graphical User-Interfaces LMI Algorithms
2015/7/13
Gives some vague ideas about useful control design tools that might be based on LMI algorithms.
Efficient Convex Optimization for Engineering Design
Optimization numerical methods linear programming robust control convex programming interior-point methods
2015/7/13
Many problems in engineering analysis and design can be cast as convex optimization problems, often nonlinear and nondifferentiable. We give a high-level description of recently developed interior-poi...
Robust Control Tools:Graphical User-Interfaces and LMI Algorithms
Robust Control Tools Graphical User-Interfaces LMI Algorithms
2015/7/13
Gives some vague ideas about useful control design tools that might be based on LMI algorithms.
Review of Mathematical Control Theory:Deterministic Finite-Dimensional Systems
Mathematical Control Theory Deterministic Finite-Dimensional Systems
2015/7/13
Review of Mathematical Control Theory: Deterministic Finite-Dimensional Systems, by E. Sontag. Published by Springer, New York, 1990, as number 6 of series Textbooks in Applied Mathematics.
Optimal Linear Static Control with Moment and Yield Objectives
Optimal Linear Static Control Moment Yield Objectives
2015/7/13
This report describes how to optimize linear static control problems involving first and second moments and yield objectives for Gaussian distributions. These problems can be cast as second-order cone...
Multi-objective H2/H-infinity-Optimal Control via Finite Dimensional Q-Parametrization and Linear Matrix Inequalities
Finite Dimensional Q-Parametrization Linear Matrix Inequalities
2015/7/13
The problem of multi-objective H2/H-infinity optimal controller design is reviewed. There is as yet no exact solution to this problem. We present a method based on that proposed by Scherer. The proble...
Control Applications of Nonlinear Convex Programming
linear programming convex optimization interior-point methods robust optimal control
2015/7/10
Since 1984 there has been a concentrated effort to develop efficient interior-point methods for linear programming (LP). In the last few years researchers have begun to appreciate a very important pro...
Robust Optimal Control of Linear Discrete-Time Systems Using Primal-Dual Interior-Point Methods
Robust Optimal Control Linear Discrete-Time Systems Primal-Dual Interior-Point Methods
2015/7/10
This paper describes how to efficiently solve a robust optimal control problem using recently developed primal-dual interior-point methods. Among potential applications are model predictive control. T...
A path-following method for solving BMI problems in control
Bilinear matrix inequality (BMI) equality (LMI) low-authority control
2015/7/10
In this paper we present a path-following (homotopy) method for (locally) solving bilinear matrix inequality (BMI) problems in control. The method is to linearize the BMI using a first order perturbat...
Low-Authority Controller Design via Convex Optimization
Low-Authorit Controller Design Convex Optimization
2015/7/10
In this paper we address the problem of low-authority controller (LAC) design. The premise is that the actuators have limited authority, and hence cannot significantly shift the eigenvalues of the sys...