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Device for eliminating voltage harmonics of power system

A technology for voltage harmonics and power systems, applied in harmonic reduction devices, AC networks to reduce harmonics/ripples, active power filtering, etc. The effect of clearing voltage harmonics is not very good, etc., to achieve the effect of fast response

Active Publication Date: 2011-08-17
RONGXIN HUIKO ELECTRIC TECH CO LTD +1
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Problems solved by technology

[0006] The effect of the above two methods for removing voltage harmonics in the power system is not very good, and the response time needs to be improved

Method used

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  • Device for eliminating voltage harmonics of power system
  • Device for eliminating voltage harmonics of power system
  • Device for eliminating voltage harmonics of power system

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Embodiment Construction

[0024] See figure 1 , a device for removing voltage harmonics in a power system, including a harmonic voltage source detection device 1, a harmonic voltage source detection device 2, a fundamental wave filter composed of a reactor 3, a reactor 4, and a capacitor 5 in series in sequence , high frequency transformer 6, AC power supply 7, power unit 8, rectifier unit 9, filter unit C, controller 10, harmonic voltage source detection device 1 is set at the input end of the device, used to detect the voltage source containing harmonics , the harmonic voltage source detection device 2 is arranged at the output end of the device, and is used to detect the voltage source after the harmonics are removed. The two harmonic voltage source detection devices both input the detected voltage source signal to the controller 10; the controller 10 It is also connected to the AC power supply 7, the rectifier unit 9, and the power unit 8, respectively.

[0025] The harmonic voltage source detecti...

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Abstract

The invention relates to a device for eliminating voltage harmonics of a power system, which comprises a harmonic voltage source detection device, a fundamental wave filter, a high frequency transformer, an AC (Alternating Current) power source, a power unit, a rectifying unit, a filtering unit and a controller, wherein the fundamental wave filter is formed by connecting a reactor 1, a reactor 2 and a capacitor in series; the harmonic voltage source detection device collects the real-time harmonic voltage of the system and inputs a harmonic voltage signal to the controller; the controller calculates out a voltage which is equal to the harmonic voltage in magnitude and opposite to the harmonic voltage in direction; the power unit inputs the voltage into an LC (Loop Circuit) branch, formed by connecting the reactors and the capacitor in series, through the high frequency transformer, and the voltage and the harmonic voltage are superposed so that the output harmonic voltage becomes zeroand the effect of filtering out the harmonic voltage in a power grid is achieved; and the controller is connected with the AC power source, the rectifying unit and the power unit respectively. In thedevice, based on the superposition principle, the purpose of eliminating the influence of a power-side higher harmonic voltage source to a load can be achieved by connecting the harmonic voltage sources in series, and the response speed is high.

Description

technical field [0001] The invention relates to a device for removing voltage harmonics of a power system. Background technique [0002] The voltage harmonics of the power system exist in the power system of various voltage levels. The harmonics will increase the loss of the power supply line, damage the electrical equipment, and reduce the reliability of the power supply. Therefore, the national standard GB / T 14549-93 "Power Quality Harmonics of Public Grids" has strict requirements on the voltage harmonic content of power systems of different voltage levels. To make the voltage harmonic content in the power system of each voltage level meet the requirements of the national standard, there are currently two solutions for suppressing the harmonics of the power grid: to prevent the load from generating harmonics, or to compensate by appropriate devices. [0003] 1) The essence of the method to prevent the load from generating harmonics is to transform the load so that it doe...

Claims

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Application Information

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IPC IPC(8): H02J3/01
CPCY02E40/26H02J3/01Y02E40/40
Inventor 张银山黄新明郭自勇李旷王军董雪武孙丹孟海星牟文晶王跃明
Owner RONGXIN HUIKO ELECTRIC TECH CO LTD
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