Filter device for controlling harmonic wave of electric power system

Abstract

The invention discloses a filter device for controlling a harmonic wave of an electric power system. The device comprises a passive filter and an active filter, wherein the passive filter comprises a quintic harmonic wave filter branch circuit, a septic harmonic wave filter branch circuit, and an eleventh harmonic wave filter branch circuit, which are connected in parallel; each harmonic wave filter branch circuit comprises a breaker, a current transformer, a fuse protector, an electric reactor, a capacitor and a bidirectional thyristor which are sequentially connected in series; the active filter comprises a first resistor and a second resistor; the first resistor is connected to a low voltage side of a power grid transformer in series; the second resistor is connected to the other side of the first resistor in parallel; the other end of the second resistor is connected with a base of an insulated grid bipolar transistor; the capacitor is connected between a collector and an emitter of the insulated grid bipolar transistor in parallel; each harmonic wave filter branch circuit of the passive filter and the input end of the active filter are connected to the low voltage side of the transformer in parallel; the output end is connected with the load; and the high voltage side of the transformer is connected with the power grid. The device can remove the harmonic wave, and can achieve the targets of saving energy and reducing emission at the same time.

Description

technical field [0001] The invention relates to a device for controlling power supply quality of a power grid, in particular to a filter device for controlling harmonics in a power system. Background technique [0002] The pollution of the natural environment has long attracted the attention of countries all over the world and has formulated corresponding environmental protection laws to limit, monitor and manage the allowable amount of various pollution discharges. However, the harmonics generated by various harmonic sources in the power system also pollute the environment of the power system, affecting the electrical environment of the entire power system, including the power system itself and the majority of users, and its pollution affects a large range and a long distance , it may be farther and wider than the pollution of the atmospheric environment by a factory. [0003] Power system waveform distortion is not a new problem. As early as 1920-1930, Germany had already...

AI Technical Summary

Problems solved by technology

At present, foreign countries are earlier than my country in terms of harmonic control, but because foreign manufacturers sometimes do not understand enough about my country's power system when designing, resulting in harmonic amplification, and at the same time, the price of imported equipment remains high. It is difficult for enterprises to bear

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