专利快速检索-快速检索全球专利，免费商用专利数据库-IPRDB

1. 发明授权

US4680531A Method for attenuating at least one electric harmonic of the system frequency in a multi-phase alternating-current system 失效
标题翻译：用于在多相交流系统中衰减系统频率的至少一个电谐波的方法
公开(公告)号：US4680531A
公开(公告)日：1987-07-14
申请号：US898019
申请日：1986-08-19
申请人： Antoine Rey , Herbert Stemmler
发明人： Antoine Rey , Herbert Stemmler
IPC分类号： H02J3/00 , H02J3/01 , G05F1/70
CPC分类号： H02J3/01 , Y02E40/40
摘要： A method for attenuating at least one unwanted harmonic, particularly the second harmonic, with respect to the system frequency in a multi-phase alternating current system, wherein an additional stabilizing circuit is installed into a conventional current/voltage controller including a current/voltage controller and a three-phase firing pulse generator in a reactive-power compensator connected via a reactive-power transformer and a current transformer to a 50 Hz three-phase system. The reactive power compensator has for each phase of the three-phase current at least one air choke, which is connected via a current transformer and via an alternating-current switch via another sum-current transformer to a secondary winding of the reactive-power transformer. In addition, the reactive-power compensator has for each phase of the three-phase current at least one capacitor bank or a capacitor, which is connected via a current transformer and an alternating-current switch (13) to the sum-current transformer (20). The stabilizing circuit measures a harmonic-containing magnetising current as the difference between compensator current (i.sub.K) and sum current (i.sub.Su) on the primary and secondary side of the reactive-power transformer, and by means of a voltage transformer a system-frequency voltage signal, which is proportional to the system frequency. These two three-phase current and voltage signals are converted into a single direct-voltage signal in a reactive-power meter. An input harmonic of 100 Hz occurs on the output side as a 50 Hz signal which is filtered out in a bandpass filter and, after a +90.degree. phase shift, is added in an adding section to the conventional output signal of the current/voltage controller via a double-sided limiter.
摘要翻译：一种用于在多相交流系统中相对于系统频率衰减至少一个不需要的谐波，特别是二次谐波的方法，其中附加的稳定电路被安装到包括电流/电压控制器的常规电流/电压控制器以及通过无功功率变压器和电流互感器连接到50Hz三相系统的无功功率补偿器中的三相点火脉冲发生器。无功功率补偿器对于三相电流的每相，至少有一个空气扼流圈，其通过电流互感器连接，并且经由另一个总和电流互感器通过交流开关连接到无功功率变压器的次级绕组。此外，无功功率补偿器具有用于三相电流的每相的至少一个电容器组或电容器，其经由电流互感器和交流开关（13）连接到和电流互感器（ 20）。稳定电路测量谐波含量的磁化电流作为无功功率变压器的一次侧和次级侧的补偿电流（iK）与和电流（iSu）之间的差，并通过变压器的系统频率电压信号，与系统频率成正比。这两个三相电流和电压信号在无功功率表中转换为单个直流电压信号。在输出侧出现100Hz的输入谐波作为在带通滤波器中被滤除的50Hz信号，并且在+90°相移之后，在加法部分中加入电流/电压的常规输出信号控制器通过双面限制器。

IPRDB

热门服务

关于我们

友情链接

联系方式