Harmonic impedance measurement apparatus of electric power system

A harmonic impedance and measurement device technology, applied in the direction of impedance measurement, etc., can solve problems such as distortion of evaluation results, achieve the effects of small device capacity requirements, wide measurement spectrum range, and reduced investment and operating costs

Inactive Publication Date: 2014-02-26
云南电网有限责任公司电网规划研究中心
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Problems solved by technology

At present, the commonly used harmonic impedance measurement methods are mainly regression method and fluctuation method, etc., but they are easily disturbed by background harmonics. In the case of large background harmonic fluctuations, the evaluation results may be distorted.

Method used

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  • Harmonic impedance measurement apparatus of electric power system
  • Harmonic impedance measurement apparatus of electric power system

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specific Embodiment approach

[0018] figure 1 , 2 Shown, a kind of specific embodiment of the present invention is:

[0019] A device for measuring harmonic impedance of a power system. The transformer T is connected to the public grid P, and the harmonic impedance measuring device NHID is connected to the three phases A, B, and C of the low-voltage side of the transformer T. The harmonic impedance measurement device NHID is composed of harmonic injector ID, control unit CD, power supply unit SU and measurement calculation unit MCM.

[0020] figure 1 It shows that the working process and working principle of the present invention are: the characteristic harmonics of the power system are 3rd (150Hz), 5th (250Hz), 7th (350Hz) and so on. When measuring the 3rd (150Hz) harmonic impedance of the power grid, the control unit CD first sends an instruction to the harmonic injector ID, and the harmonic injector ID injects 149Hz non-characteristic harmonics into the three phases A, B, and C of the low-voltage ...

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Abstract

The invention relates to a harmonic impedance measurement apparatus of an electric power system. A transformer T is connected with a public electric network P; the harmonic impedance measurement apparatus NHID is connected to an A phase, a B phase and a C phase of a low-voltage side of the transformer T. The NHID is composed of a harmonic injector ID, a control unit CD, a power source unit SU and a measurement calculation unit MCM; the harmonic injector ID includes a direct-current energy storage capacitor C, large-power electronic power switches from S1 to S6, and a three-phase boosting transformer Ts1. And the whole injection process is completely controllable. According to the invention, precise measurement and calculation can be carried out to obtain the harmonic impedance of the system and reliable harmonic impedance parameters can be provided for harmonic treatment.

Description

technical field [0001] The invention relates to a device for measuring harmonic impedance of a power system. Background technique [0002] Power electronics technology has achieved rapid development in recent years, providing strong support for the improvement of power system power supply performance and technologies such as ultra-high voltage transmission and direct current transmission, and is more and more widely used in various fields of the national economy. However, power electronic equipment in the grid, as a nonlinear load, has become an important source of harmonics in the grid. [0003] In order to control the harmonic pollution in the public power grid, the national standard GB / T 14549-93 "Power Quality Public Power Grid Harmonics" stipulates the user harmonic emission limit, the key problem to be solved is how to control the system and user harmonics in PCC However, the estimation of the harmonic emission level mainly revolves around the estimation of the harmon...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01R27/16
Inventor 游广增钱迎春司大军
Owner 云南电网有限责任公司电网规划研究中心
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