谐波产生危害影响.pptVIP

谐波名詞定義 谐波产生的影响 何谓谐波(HARMONIC)? 电力系统中除基本波(50/60Hz)外，任一周期性之讯号，皆称为谐波 整数谐波 : 2nd, 3rd, 4th, 5th … 正序谐波 :(3n+1) 4th, 7th, 10th... 偶次谐波 : 2nd, 4th, 6th, 8th … 负序谐波 :(3n-1) 2nd, 5th, 8th... 奇次谐波 : 3rd, 5th, 7th, 11th … 零序谐波 :(3n) 3rd, 6th, 9th... 非整数谐波 : 2.3th, 5.6th … 次级谐波 : 1 之谐波 总谐波电压失真率: V(THD) 总谐波电流失真率: I(THD) 谐波种类? 铁磁性负载 电弧设备 变压器 电动机 电弧炉 点焊机 电子式电力转换器 1.整流器(Converter) 4.切换式电源供应器 2.变流器(Inverter) (Switch Moad Power Supply) 3.循环换流器 5.脈波调变驱动裝置 (Cycloconverter) (Pulse Width Modulation Driver) 谐波产生源 工 厂 ◎ 整流设备 (DC MOTOR) ◎ 变頻器 (INVERTER) ◎ 恒溫设备 ( SCR Control) ◎ 点焊机 ◎ 电弧炉 ( ARC FURANCE) ◎ 变压器 大楼、医院 家 庭 ◎ 电梯 ◎ 洗衣机 ◎ 不断电系统 ( UPS ) ◎ 冷气机 ◎ 空调主机 ◎ 照明设备 谐波产生源 AC R S T DC + - 6-PULSE CONVTER 谐波产生源示意图 + AC R S T - P W M R S T AC DC 6-PULSE INVERTER 谐波产生源示意图 n:谐波次数 k:常数 1,2,3,… p:pulse数 例: n=1*6±1 n=2*6±1 : : 5 7 11 13 Page56 产生之谐波次数 In:谐波电流值 I1:基本波电流 n :谐波次数 例: 产生之谐波量 11 0 20 40 60 80 100 120 160 140 180 200 20 30 40 50 60 70 80 AC HARMONIC CURRENT AS PERCENT OF Idc 10 0 PECK TO PECK RIPPLE AS PERCENT OF Idc Six-Pulse Rectifier With DC Ripple 5th Harmonic as a Function of DC Ripple Overlap angle u (degrees) 0.1 5 10 20 5th HARMONIC 0 20 40 60 80 100 120 160 140 180 200 10 15 20 25 30 35 40 45 50 AC HARMONIC CURRENT AS PERCENT OF Idc 5 0 PECK TO PECK RIPPLE AS PERCENT OF Idc Six-Pulse Rectifier With DC Ripple 7th Harmonic as a Function of DC Ripple Overlap angle u (degrees) 0.1 5 10 20 7th HARMONIC 0 20 40 60 80 100 120 160 140 180 200 4 6 8 10 12 14 16 AC HARMONIC CURRENT AS PERCENT OF Idc 2 0 PECK TO PECK RIPPLE AS PERCENT OF Idc Six-Pulse Rectifier With DC Ripple 11th Harmonic as a