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1、 21-02-15 Delta Energy Systems,2021/2/15 Dr. Mao Department of Electrical Eng. &Automation of Fuzhou University, 2 AC/ DC Rectifier,Dr. Mao xingkui,2021/2/15,College of Electrical&Automation Engineering, Fuzhou University, 21-02-15 Delta Energy Systems,2021/2/15 Dr. Mao Department of Electrical Eng.
2、 &Automation of Fuzhou University,单相半波可控,a. 纯阻性负载,b. 纯感性负载,c. 阻感负载, 21-02-15 Delta Energy Systems,2021/2/15 Dr. Mao Department of Electrical Eng. &Automation of Fuzhou University,改进单相半波可控, 21-02-15 Delta Energy Systems,2021/2/15 Dr. Mao Department of Electrical Eng. &Automation of Fuzhou University,
3、单相桥式全控,a. 纯阻性负载,b. 阻感性负载， 且=L/RT,Z, 21-02-15 Delta Energy Systems,2021/2/15 Dr. Mao Department of Electrical Eng. &Automation of Fuzhou University,c. 反电动势+阻感性负载(=L/RT), 21-02-15 Delta Energy Systems,2021/2/15 Dr. Mao Department of Electrical Eng. &Automation of Fuzhou University, 21-02-15 Delta Ener
4、gy Systems,2021/2/15 Dr. Mao Department of Electrical Eng. &Automation of Fuzhou University,单相全波可控整流电路,单相桥式半控整流电路, 21-02-15 Delta Energy Systems,2021/2/15 Dr. Mao Department of Electrical Eng. &Automation of Fuzhou University,主要内容,2.2 三相 SCR 可控硅Rectifier,2.3 变压器漏感对Rectifier的影响,2.4 电容滤波不控Rectifier,2.
5、5 Rectifier的Harmonics 和PF,2.6 Rectifier的有源逆变状态, 21-02-15 Delta Energy Systems,2021/2/15 Dr. Mao Department of Electrical Eng. &Automation of Fuzhou University,一. 三相半波,2.2 三相 SCR 可控硅Rectifier,应用：负载容量较大，输出电压纹波小,1.电路原理图,a. 一次侧三角形,二次侧星形,b. 晶闸管共阴极接法,c. 电压最高的相导通，输出脉动3次（脉波数），周 期2/3, 21-02-15 Delta Energy S
6、ystems,2021/2/15 Dr. Mao Department of Electrical Eng. &Automation of Fuzhou University,. Z=R,自然换相点:各相晶闸管能触发导通的最早时刻, a=0,电角度为30。,数量关系：, 21-02-15 Delta Energy Systems, 21-02-15 Delta Energy Systems,2021/2/15 Dr. Mao Department of Electrical Eng. &Automation of Fuzhou University,. Z=R+jL,且=L/RT,a30o:与
7、纯阻性负载相同,a30o：不同于纯阻性负载,导通角都相同：=2/3, 21-02-15 Delta Energy Systems,二. 三相全桥,1.电路原理图,a. 一次侧三角形,b. 晶闸管共阴极、 共阳极接法,c. 工作时序/导通相,共阴极：电压最高相；共阳极：电压最低的相，即 对线电压进行整流，一个周期输出脉动6次， 即输出电压周期为2/6, 21-02-15 Delta Energy Systems, 21-02-15 Delta Energy Systems,2021/2/15 Dr. Mao Department of Electrical Eng. &Automation of
8、 Fuzhou University,. Z=R,数量关系：, 21-02-15 Delta Energy Systems,a=00,a=600,a=900, 21-02-15 Delta Energy Systems,. Z=R+jL,且=L/RT,a60o:与纯阻性负载相同,a60o：不同于纯阻性负载,导通角都相同：=/3,Return, 21-02-15 Delta Energy Systems,2021/2/15 Dr. Mao Department of Electrical Eng. &Automation of Fuzhou University,2.3 变压器漏感对Rectif
9、ier的影响,Return, 21-02-15 Delta Energy Systems,2021/2/15 Dr. Mao Department of Electrical Eng. &Automation of Fuzhou University,2021/2/15 Dr. Mao Department of Electrical Eng. &Automation of Fuzhou University,2.4 电容滤波不控Rectifier,一. 单相,1.电路原理图,2工作原理及波形图,Ud=1.2U2，当=RC （3-5）T/2 ；最小Ud=0.9U2,由、R、C决定, 21-02
10、-15 Delta Energy Systems,2021/2/15 Dr. Mao Department of Electrical Eng. &Automation of Fuzhou University,2.5 Rectifier的Harmonics 和PF,一谐波与无功危害,1谐波(harmonics),2. 无功(reactive power),二H与R分析基础,1Harmonics,HRi=In/I1*100%，In，I1：RMS,THD=Ih/I1*100%，Ih：总谐波电流RMS, 21-02-15 Delta Energy Systems,2021/2/15 Dr. Mao
11、 Department of Electrical Eng. &Automation of Fuzhou University,2Power Factor ,正弦电路,Active power P =UIcos,=P/S=I1/Icos=cos,Apparent power S= UI,Reactive power Q=UIsin,非正弦电路,Active power P=UI1cos,Apparent power S= UI, 21-02-15 Delta Energy Systems,2021/2/15 Dr. Mao Department of Electrical Eng. &Auto
12、mation of Fuzhou University,三阻感负载可控整流,1单相桥式全控,=cos=0.9cos,2三相桥式全控,谐波：奇次谐波,=cos=0.955cos,谐波：6k1(k为正整数),四电容滤波不控,1单相桥式全控：奇次谐波,2三相桥式全控：6k1(k为正整数)谐波,五整流输出电压、电流谐波：mk次（m:脉波数）,Return, 21-02-15 Delta Energy Systems,2.6 大功率可控整流电路-带平衡电抗器的双反星形可控整流电路, 21-02-15 Delta Energy Systems,2.6 大功率可控整流电路-多重化-移相控制, 21-02-1
13、5 Delta Energy Systems,2.6 大功率可控整流电路-多重化-顺序控制, 21-02-15 Delta Energy Systems,2021/2/15 Dr. Mao Department of Electrical Eng. &Automation of Fuzhou University,2.7 Rectifier的有源逆变状态,一. 逆变,1. 逆变,直流电转换为交流电。,有源逆变：交流侧与电网连接；反之为无源逆变。,2. 逆变条件,. 900 ，输出电压为负值；,. 负载中要有反电动势。, 21-02-15 Delta Energy Systems,2021/2/
14、15 Dr. Mao Department of Electrical Eng. &Automation of Fuzhou University,直流发电机电动机之间电能的流转 a）两电动势同极性EG EM b）两电动势同极性EM EG c）两电动势反极性，形成短路, 21-02-15 Delta Energy Systems,2021/2/15 Dr. Mao Department of Electrical Eng. &Automation of Fuzhou University,3. 逆变角,逆变角=-，以自然换相点为起始点， 向右计算；以=0,即=为起始点为起始点， 向左计算。,Return, 21-02-15 Delta Energy Systems, 21-02-15 Delta Energy Systems,2.8 晶闸管直流电动机系统,2.8.1 工作于整流状态时, 21-02-15 Delta Energy Systems,考虑电流断续时不同a 时反电动势的特性曲线 1 a 460, 21-02-15 Delta Energy Systems,电动机在四象限中的机械特性, 21-02-15 Delta Energy Systems,2.8.2 晶闸管直流电动机系统,