6.1 Basic principles 6.2 Some major PWM techniques in DC/AC inverters 6.3 PWM techniques with feedback control 6.4 PWM rectifiers

PEREC Classification of ac to Ac converters Same frequency Variable variable magnitude AC power frequency AC power AC power AC controllers Frequency converters

2.1 Single-phase controlled rectifier 2.2 2 Three-phase- controlled rectifier 2.3 Effect of transformer leakage inductance on rectifier circuits 2.4 Capacitor-filtered uncontrolled rectifier 2.5Harmonics and power factor of rectifier circuits 2.6 High power controlled rectifier 2.7 Inverter mode operation of rectifier circuit 2.8 Thyristor-DC motor system 2.9 Realization of phase-control in rectifier circuits

l. What is power electronics? ll. The history lll. Applications V. A simple example lV. About this course

Renewable Energy Networks Grid code sets out requirements for grid interconnection. Most current renewable generation systems are treated as \negative\ load. Future systems MUST contribute to system frequency and voltage control. Grid interconnection usually \makes or breaks\ a project

7.1软开关的基本概念 7.2软开关电路的分类 7.3典型的软开关电路

3.1基本斩波电路 3.2复合斩波电路和多相多重斩波电路

5.1换流方式 5.2电压型逆变电路 5.3电流型逆变电路 5.4多重逆变电路和多电平逆变电路

25、在实际电路中为什么要用晶闸管串联 答:单个晶闸管的额定电压是有一定限度的,当实际电路要求晶闸管承受的电压值大于单个晶闸管的额定电压时,可以用两个以上的同型号的晶闸管串联使用

1·高频化的意义是什么?为什么提高开关频率可以减小滤波器的体积和重量?为什么提高开关频率可以减小变压器的体积和重量? 2.软开关电路可以分为哪几类?其典型拓扑分别是什么样的?各有什么特点?