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热词
    • 1. 发明授权
    • Process and device for eliminating or reducing harmonics and/or
resonance oscillations
    • 消除或减少谐波和/或谐振的过程和设备
    • US5235503A
    • 1993-08-10
    • US804598
    • 1991-12-10
    • Herbert StemmlerPeter SteimerBjorn Odegard
    • Herbert StemmlerPeter SteimerBjorn Odegard
    • H02M1/12H02M5/45
    • H02M5/4505H02M1/12
    • An a.c. machine (7) with, connected in parallel thereto, a capacitor bank (CR, CS, CT), which are fed by a converter (1-4) with a d.c. intermediate circuit, form a resonant system which is excited by the rectangular current of an inverter (4) of the converter. In this case, there is superimposition of the fundamentals and the normal harmonics in the machine voltage and in the machine current of an additional harmonic with the frequency of the resonance point. In the lower speed range of the a.c. machine (7), this excitation is eliminated by an optimum operating sequence of current gaps, which are generated inside a current block by means of a quenching circuit (3). Current gaps are generated at the start and end of each current block for the purpose of damping the 11th and 13th harmonic, and in the middle of the current block for the purpose of damping the 7th harmonic. A turn-on angle basic value signal (.alpha..sub.M) is modified by a turn-on angle differential signal (.DELTA..alpha..sub.M) for the purpose of damping the 5th harmonic, in particular an exciting or available harmonic being controlled to 0 or in the vicinity of 0.
    • 一个 与并联连接的电容器组(CR,CS,CT)的机器(7)由转换器(1-4)供电,具有直流。 形成由转换器的逆变器(4)的矩形电流激发的谐振系统。 在这种情况下,在机器电压和谐波点频率的附加谐波的机器电流中存在基本原理和正常谐波的叠加。 在a.c.的较低速度范围内。 机器(7)中,通过淬火电路(3)在当前块内产生的当前间隙的最佳操作顺序来消除该激发。 为了阻尼第11次谐波和第13次谐波以及当前块的中间,为了阻尼第7次谐波,在当前块的开始和结束处产生电流间隙。 导通角度基本值信号(αM)由导通角差分信号(DELTA alpha M)修改,以阻尼第五谐波,特别是激励或可用谐波被控制为0或在 附近0。