公开(公告)号：US5886493A

公开(公告)日：1999-03-23

申请号：US599684

申请日：1996-03-12

申请人： Yoshisuke Ueda ,  Fuyuto Takase ,  Kiyoshi Oku ,  Takayuki Hira ,  Atsushi Ashizawa

发明人： Yoshisuke Ueda ,  Fuyuto Takase ,  Kiyoshi Oku ,  Takayuki Hira ,  Atsushi Ashizawa

IPC分类号： H02J3/01 ,  H02P9/10 ,  G05B11/01

CPC分类号： H02J3/01 ,  H02P9/10 ,  Y02E40/40

摘要： An excitation control device controls excitation of a synchronous machine so as to absorb the harmonic current of a specified order superposed onto the current flowing between an electric power system to the synchronous machine.A harmonic detector selectively passes a harmonic component of the order of 6n.+-.1 in the detection signal detected by a current transformer. A pass signal of the harmonic detector is. 3-phase/2-phase converted by a rotating coordinate circuit into components on the orthogonal 2 axes on the rotating coordinate system rotating at an angular frequency of a fundamental current of the electric power system. At this time, the pass signal is calculated as a 6n-order harmonic current represented by the components on the normal two axes. The obtained 6n-order harmonic current is retrieved through a 6n-order harmonic filter, amplified by a power amplifier, and provided as an excitation current for the synchronous machine. Using the excitation current, a current having the same amplitude as, but opposite phase to, the harmonic current of the order of 6n.+-.1 flows as an armature current in the synchronous machine. Thus, the harmonic current of the specified order superposed onto the system current can be canceled.

摘要翻译： 励磁控制装置控制同步电机的励磁，以吸收与在同步电机之间流动的电流叠加的规定次数的谐波电流。 谐波检测器选择性地将由电流互感器检测的检测信号中的6n +/- 1级的谐波分量传递。 谐波检测器的通过信号是。 由旋转坐标电路进行3相/ 2相转换为以电力系统的基波电流的角频率旋转的旋转坐标系上的正交2轴上的分量。 此时，通过信号被计算为由正常两个轴上的分量表示的6n次谐波电流。 所获得的6n次谐波电流通过6n级谐波滤波器检索，由功率放大器放大，并作为同步电机的励磁电流提供。 使用励磁电流，具有与6n +/- 1量级的谐波电流相同但相反相的电流作为同步电机中的电枢电流流动。 因此，可以取消叠加在系统电流上的指定次序的谐波电流。

公开(公告)号：US5668458A

公开(公告)日：1997-09-16

申请号：US389692

申请日：1995-02-15

申请人： Yoshisuke Ueda ,  Fuyuto Takase ,  Kiyoshi Oku ,  Takayuki Hira ,  Atsushi Ashizawa

发明人： Yoshisuke Ueda ,  Fuyuto Takase ,  Kiyoshi Oku ,  Takayuki Hira ,  Atsushi Ashizawa

IPC分类号： H02J3/01 ,  H02K11/00 ,  H02K19/36 ,  H02P13/00

CPC分类号： H02K19/365 ,  H02K11/33 ,  H02K19/36

摘要： A synchronous machine effectively absorbs higher harmonics in an AC system to which the synchronous machine is linked. The synchronous machine includes a damper winding, disposed on each magnetic pole and constituting by itself an independent closed circuit; capacitors, each of which is connected in parallel with each of several damper winding divisions obtained by dividing the damper winding at predetermined winding turns; a DC reactor for blocking flowing-in of higher harmonics to a DC power supply for DC excitation; a series resonant circuit further including the damper winding and the capacitors; and a series resonant circuit including the field winding and capacitors. Resonant frequencies of both series resonant circuits are set at 6 nf (n: an integer, f: a fundamental frequency) so as to greatly reduce impedance of the damper winding and the field circuit seen from an armature of the synchronous machine, by which to extinguish or reduce higher harmonics (6n.+-.1)f of the AC system.

摘要翻译： 同步电机有效吸收同步电机所连接的交流系统中的高次谐波。 同步电机包括一个阻尼绕组，它设置在每个磁极上，并由它自身构成独立的闭路; 电容器，每个电容器与通过以预定的绕组匝分隔阻尼绕组而获得的几个阻尼器绕组部分并联连接; 直流电抗器，用于阻断高频谐波进入直流电源直流励磁; 串联谐振电路，还包括阻尼绕组和电容器; 以及包括励磁绕组和电容器的串联谐振电路。 两个串联谐振电路的谐振频率设定为6nf（n：整数f：基频），以便大大降低阻尼绕组和从同步电机的电枢看到的励磁电路的阻抗， 熄灭或减少交流系统的高次谐波（6n +/- 1）f。