IGD515 EI在高压大功率IGBT驱动电路设计中的运用

在兆瓦级机车牵引变流器的研制中,为解决高压大功率IGBT并联使用的驱动问题,选用了新型实用的驱动模块IGD515EI。介绍了这种模块的主要性能、内部结构和以IGD515EI为核心设计的驱动电路,并给出了实用效果。     

基于光伏系统IGBT的驱动及保护研究

本文介绍了驱动电路的设计原则和方法,分析了IGBT的几种典型驱动电路,并对IGBT的保护电路进行了探讨。     

应用于小型风力发电系统的Buck电路

提出了应用于小型风力发电系统的Buck电路结构.采用几何参数法(K-G法)设计电感;并基于PWM开关模型,建立了Buck电路的小信号交流模型.在Matlab环境下,分别建立了Buck电路的电路仿真模型和传递函数仿真模型,并利用该模型构建了以蓄电池和电阻为负载的风电系统模型.对蓄电池恒压和浮充充电的仿真结果表明,Buck电路能满足风电系统功率控制的要求.     

推荐两种大功率LED室内照明驱动电路

LED日光灯最大优点是节能省电,其次是使用寿命长,但目前LED照明灯具在家庭中并未得到广泛应用,价格高是其主要原因.本文介绍两种家庭照明用LED驱动电路,可动手自己制作,也可在市面上买到,其制作安装成本相当低,可使大功率LED灯具在家庭照明领域得到普及推广.     

直接驱动型全功率变流风力发电系统

从等效电路的角度分析了两级联H桥输出五电平的工作模式.为了满足直驱型风电系统对变流器的大功率要求,采用载波相移正弦脉宽调制技术(CPS-SPWM)控制级联H桥变流器,并对比了常规CPS-SPWM调制方法和对称调制法在实现五电平输出上的差异,经仿真和试验验证:这种拓扑结构满足直驱型风力发电系统对变流器的要求,说明CPS-SPWM调制方法适用于直驱型风力系统中的大功率变流器,在提高装置功率容量的同时,可以有效地减小变流器输出谐波,调节输出波形,提高整个装置的信号传输带宽.     

空调IGBT器件电路应用可靠性研究

变频空调控制器中IGBT作为PFC电路的开关器件,其应用可靠性要求很高。本文结合电路应用分析和器件异常形貌分析,总结出IGBT器件在电路应用过程中常见可靠性应用建议和异常形貌对应总结。过程中的分析和结论对空调IGBT器件应用设计和异常分析具有一定指导意义。     

永磁同步风力发电系统的PWM逆变器开路故障特征分析

文章提出了一种利用电流有效值与瞬时值变化特征定位逆变器IGBT开路故障点的方法。基于逆变器硬件拓扑结构,阐述了逆变器中IGBT开路故障点定位的基本原理;利用MATLAB/Simulink平台中搭建的永磁同步风力发电系统仿真模型,在分析IGBT开关管正常状态与故障状态下逆变器输出电流有效值与瞬时值的变化特征基础上,构建了逆变器IGBT开路故障点诊断规则表;利用永磁同步风力发电系统实验验证平台对该诊断方法的正确性进行校验,结果表明该方法不仅可精确诊断逆变器单桥臂单/双IGBT开关管开路故障,还可适用于逆变器中同时出现的单桥臂单/双IGBT开关管开路故障的定位。     

适于直驱型风力发电系统的大功率变流器

直驱型变速恒频风力发电系统采用低速永磁同步发电机结构,无需齿轮箱,机械损耗小,运行效率高,维护成本低.该系统须采用的大功率变流器单元可以有不同的拓扑结构,根据每种电路拓扑的特点,整个系统的控制方法都会相应地发生变化.文章对直驱型变速恒频风力发电系统基本拓扑结构进行了对比分析,着重分析了常见的中高压变频器主电路拓扑,并对大功率变流器在风力发电系统应用中的可行性进行了相关分析与探讨.     

应用于低电压穿越下Crowbar保护电路的分析

基于对适用于双馈风电系统Crowbar保护电路的分析,对常用的Crowbar保护方案进行了分类,对其工作原理和实现方法进行了详细说明,通过对比分析,得出优选方案。     

用于直驱型风力发电系统的变流器

分布式风力发电系统是具有广泛应用前景的风电技术。文章针对分布式小型直驱风力发电机组的需求,设计了适用于该系统的变流装置。将软开关技术和双环控制策略应用到该变流器的设计中,有效地降低了风电在变流过程中的功耗,提高了效率和供电质量,并大大地减少了经济成本。通过实验证明了设计的正确性和可靠性。     

国外大功率风机技术竞争态势

由于风机单机功率越大每千瓦小时风电成本越低,因此,近年来德国、丹麦、美国主要风机生产厂家纷纷推出大功率风机,以适应全球风机市场对大功率风机愈来愈旺盛的需求。表1为Enercon、Multib-     

基于交叉权重因子的高比例风电接入电网有功校正控制方法

在重载线路输送功率约束下,充分挖掘轻载线路的输送能力,成为在现有网架结构下提高风电外送的重要途径。文章引用交叉权重思想,从潮流基本方程出发,利用线路潮流与注入有功功率灵敏度的关系,提出基于交叉权重因子的有功校正控制方法,根据交叉权重确定风电场调节顺序,使潮流分布均匀合理。该方法可充分发挥轻载线路功率输送能力,缓解在风电大发时部分线路重负荷问题,进而在电网结构不变的条件下有效提高风电送出功率。     

分散式风力发电机组的电压控制

风电的分散式开发不同于大规模开发和分布式开发,由于分散风电靠近负荷中心,直接接入配电网,且不加装无功补偿调节装置SVC,配网中较大的电压波动给分散风电的并网运行带来影响。文章讨论了配网对分散风电的电压控制特点和要求,结合风电机组无功控制能力,并推导出满足配网电压调节要求的风电机组无功控制范围和对机组设备的要求。     

风电机组的型式认证和风电场认证--IEC风电机组认证标准介绍

本文介绍的型式认证和风电场认证是依据国际电工委员会IECWT01：2001标准风电机组合格测试与认证体系规则及程序。型式认证的步骤包括设计评估、生产评估、质量管理评估以及型式实验。风电场认证是在型式认证完成后进行，包括场地评估、基础设计评估、安装评估（可选）一旦型式认证和风电场认证的相关工作完成后将签发认证证书。     

Output power control for large wind power penetration in small power system

Nowadays, wind turbine generator (WTG) is increasingly required to provide control capabilities regarding output power. Under this scenario, this paper proposes an output power control of WTG using pitch angle control connected to small power systems. By means of the proposed method, output power control of WTG considering states of power system becomes possible, and in general both conflicting objectives of output power leveling and acquisition power increase are achieved. In this control approach, WTG is given output power command by fuzzy reasoning which has three inputs for average wind speed, variance of wind speed, and absolute average of frequency deviation. Since fuzzy reasoning is used, it is possible to define output power command corresponding to wind speed condition and changing capacity of power system momentarily. Moreover, high performance pitch angle control based on output power command is achieved by generalized predictive control (GPC). The simulation results by using actual detailed model for wind power system show the effectiveness of the proposed method.     

Demand side resource operation on the Irish power system with high wind power penetration

The utilisation of demand side resources is set to increase over the coming years with the advent of advanced metering infrastructure, home area networks and the promotion of increased energy efficiency. Demand side resources are proposed as an energy resource that, through aggregation, can form part of the power system plant mix and contribute to the flexible operation of a power system. A model for demand side resources is proposed here that captures its key characteristics for commitment and dispatch calculations. The model is tested on the all island Irish power system, and the operation of the model is simulated over one year in both a stochastic and deterministic mode, to illustrate the impact of wind and load uncertainty. The results illustrate that demand side resources can contribute to the efficient, flexible operation of systems with high penetrations of wind by replacing some of the functions of conventional peaking plant. Demand side resources are also shown to be capable of improving the reliability of the system, with reserve capability identified as a key requirement in this respect.     

第三讲风力发电用的发电机及风力发电系统

风能是我国目前开发利用比较成熟的一种新能源,风电事业正在我国蓬勃发展.为了帮助读者了解风力发电知识,我们请长期从事风力发电研究工作的中国科学院电工研究所倪受元研究员撰写了<风力发电>讲座,以飨读者.     

Markovian power curves for wind turbines

This paper shows a novel method to characterize wind turbine power performance directly from high‐frequency fluctuating measurements. In particular, we show how to evaluate the dynamic response of the wind turbine system on fluctuating wind speed in the range of seconds. The method is based on the stochastic differential equations known as the Langevin equations of diffusive Markov processes. Thus, the fluctuating wind turbine power output is decomposed into two functions: (i) the relaxation, which describes the deterministic dynamic response of the wind turbine to its desired operation state, and (ii) the stochastic force (noise), which is an intrinsic feature of the system of wind power conversion. As a main result, we show that independently of the turbulence intensity of the wind, the characteristic of the wind turbine power performance is properly reconstructed. This characteristic is given by their fixed points (steady states) from the deterministic dynamic relaxation conditioned for given wind speed values. The method to estimate these coefficients directly from the data is presented and applied to numerical model data, as well as to real‐world measured power output data. The method is universal and is not only more accurate than the current standard procedure of ensemble averaging (IEC‐61400‐12) but it also allows a faster and robust estimation of wind turbines' power curves. Copyright © 2007 John Wiley & Sons, Ltd.