低损耗多调谐无源滤波器

Multi-tuned Passive Filters with Less Power Loss

双调谐滤波器和三调谐滤波器具有占地少、减少高压电感和电容元件、节省开关等诸多优点,已经在直流输电工程中得到广泛应用。但是现有的多调谐阻尼型滤波器用于低次谐波滤波时,滤波器的基波损耗过大。文中介绍了一种低损耗的阻尼型双调谐滤波器和三调谐滤波器电路,其基本思路是使滤波电路的部分LC元件构成基波串联调谐电路,并使并联阻尼电阻连接在基波调谐电路的两端,从而避免阻尼电阻上的基波功率损耗。新滤波器用在高压直流输电系统中将节省运行成本。

The double and triple tuned filters have the advantages of occupying less space, cutting down the number of high voltage capacitors, reactors and breakers, etc., and have been widely used in HVDC projects. However, when damped type multi-tuned filters in existence are used for low order harmonic filtering, there will be much more power loss at fundamental frequency. This paper introduces a new damped type double and triple tuned filter circuits with less power loss. The invention lets some L and C components of the filter form a series tuned circuit at fundamental frequency, which is connected in parallel with a damping resister, so as to avoid the power loss on the resistor at fundamental frequency. New filters are costless in operation when used in HVDC power transmission system.