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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。
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...
大连工业大学机械与自动化学院科研方向:先进制造工艺技术与装备;企业制造信息化技术;现代机械设计理论与方法;数字化设计与产品结构性能优化;机电产品设计及控制技术;机械系统振动与噪声控制技术;工业机器人设计与应用技术;模具设计与制造;测量技术与产品质量工程。
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...
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(...
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...
Gives some vague ideas about useful control design tools that might be based on LMI algorithms.
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...
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, by E. Sontag. Published by Springer, New York, 1990, as number 6 of series Textbooks in Applied Mathematics.
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...
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...
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...
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...
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...

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