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FFT-based hybrid reactive power compensation and harmonic suppression device

A harmonic control and hybrid technology, applied in the direction of reactive power adjustment/elimination/compensation, circuit devices, active power filtering, etc., can solve difficulties, difficulty in obtaining command current of active filters, third harmonic pollution three times The harmonic circuit impedance is small and the current is large, so as to achieve the effect of effective control

Pending Publication Date: 2018-08-17
FUZHOU POWER SUPPLY COMPANY OF STATE GRID FUJIAN ELECTRIC POWER +2
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Problems solved by technology

Because the lower the harmonic frequency is, the more difficult it is to filter out the harmonics. The third harmonic pollution problem is an international big problem. The same 2nd and 4th harmonic pollution is also a big international problem. The difficulty in the treatment of third harmonic pollution The reason is that the impedance of the third harmonic circuit is small and the current is large. The difficulty in the treatment of 2nd and 4th harmonic pollution is that it is not only difficult to obtain the command current of the active filter

Method used

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  • FFT-based hybrid reactive power compensation and harmonic suppression device
  • FFT-based hybrid reactive power compensation and harmonic suppression device
  • FFT-based hybrid reactive power compensation and harmonic suppression device

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Embodiment 1

[0018] A FFT-based hybrid reactive power compensation and harmonic control device is characterized in that it includes a passive filter, a hybrid power active filter for filtering out 2nd and 4th harmonics, an IGBT drive circuit, Signal conditioning circuit and DSP control circuit, described DSP control circuit comprises DSP digital signal processor, FPGA programmable logic device, external ADC converter, phase-locked loop circuit and reactive power control, described passive filter It is composed of 5th, 7th and 11th single-tuned passive filters in star connection. The passive filter is connected to the three-phase phase line on the low-voltage side of the transformer, and its neutral point is connected to the neutral line. Hybrid type The power active filter is composed of a passive part and an active part cascaded. The passive part is composed of a single-tuned passive filter tuned at the 7.1th fundamental frequency. The active part is composed of a three-phase full-bridge I...

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Abstract

The invention discloses an FFT-based hybrid reactive power compensation and harmonic suppression device, which comprises a passive filter, a hybrid power active filter for filtering 2nd and 4th harmonics, an IGBT driving circuit, a signal conditioning circuit and a DSP control circuit. The passive filter is composed of 5th, 7th and 11th single-tuned passive filters in star connection. The hybrid power active filter comprises a passive part and an active part in cascaded connection. The passive part is composed of a single-tuned passive filter tuned at 7.1th fundamental frequency. The active part uses a three-phase full-bridge IGBT inverter structure. The FFT-based hybrid reactive power compensation and harmonic suppression device extracts a signal of the 2nd and 4th harmonic currents fromnonlinear load as a control signal of the power active filter, thereby realizing effective control of the active power filter and effectively filtering out 2nd and 4th Harmonic current.

Description

technical field [0001] The invention relates to a harmonic control device, in particular to a hybrid reactive power compensation and harmonic control device based on FFT. Background technique [0002] Due to the increasingly widespread application of power electronic devices and the widespread application of a large number of nonlinear loads in distribution networks, the problem of harmonic pollution in power grids is becoming more and more serious, and the damage to distribution networks is very serious. There are not only the third harmonic current and the 5th, 7th, and 11th harmonic currents in the power grid, but also the 2nd and 4th harmonic currents. Because the lower the harmonic frequency is, the more difficult it is to filter out the harmonics. The third harmonic pollution problem is an international big problem. The same 2nd and 4th harmonic pollution is also a big international problem. The difficulty in the treatment of third harmonic pollution The reason is tha...

Claims

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Application Information

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IPC IPC(8): H02J3/01H02J3/18
CPCH02J3/01H02J3/1842Y02E40/20
Inventor 王永明黄毅标郑文兵陈斌梁宏池翁晓春李怡然陈石川王瑞祺
Owner FUZHOU POWER SUPPLY COMPANY OF STATE GRID FUJIAN ELECTRIC POWER
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