Double-resonance three-phase active power filter, and control method and device

Abstract

The invention discloses a double-resonance three-phase active power filter, and a control method and device, and solves the problems that in the prior art, the passive power filter is composed of an electric reactor, a capacitor and a resistor, while the compensation reactive power is achieved, the function of restraining the specific harmonic current is often taken into consideration, the passivepower filter is simple in structure and low in cost, but the influence of the frequency fluctuation of the power grid and other loads is large, and the technical problem that the performance of the filter is greatly influenced due to detuning of the filter is solved; the active power filter is a device for dynamically compensating harmonic current, all harmonic currents can be compensated, and specific harmonic currents can be compensated, but the active power filter is limited by the working voltage of the power electronic power device, and the cost is increased along with the increasing ofcapacity, and therefore the active power filter has the technical problem of being not suitable for a high-voltage system.

Description

technical field [0001] The invention relates to the field of power electronic control, in particular to a double resonance type three-phase active power filter, a control method and a device. Background technique [0002] At present, power electronic equipment is developing in the direction of integration, large capacity, high frequency, and high efficiency, and is widely used in various fields. However, due to its high-frequency switching state and its Non-linear characteristics, so a large number of harmonics and reactive components will be generated during operation, which will cause serious pollution to the power grid, resulting in a decline in power quality, and in severe cases, it will cause relay protection device malfunction, electrical equipment failure and accidents. [0003] In order to reduce the harm caused by the harmonic pollution of the power grid, passive power filters and active power filters are commonly used. Passive power filters are composed of reactors...

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Problems solved by technology

[0002] At present, power electronic equipment is developing in the direction of integration, large capacity, high frequency, and high efficiency, and is widely used in various fields. However, due to its high-frequency switching state and its Non-linear characteristics, so a large number of harmonics and reactive components will be generated during work, which will cause serious pollution to the power grid, resulting in a decline in power quality, and in severe cases, it will cause relay protection device malfunction, electrical equipment failure and accidents

[0003] In order to reduce the harm caused by the harmonic pollution of the power grid, passive power filters and active power filters are commonly used. Passive power filters are composed of reactors, capacitors and resistors. The function of the specific subharmonic current, although the structure of the passive power filter is simple and low in cost, but due to the influence of the frequency fluctuation of the power grid and other loads, it will cause the filter to detune and greatly affect its performance; there are technical problems; The source power filter is a device that dynamically compensates harmonic currents. It can compensate all harmonic currents and specific harmonic currents. However, due to the limitation of the operating voltage of power electronic power devices, the active power filter has The increase of the cost will also become very high, so there is a technical problem that the active power filter is not suitable for the high voltage system

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