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Electric power system current quality assessment method

A current quality evaluation and power system technology, applied in the direction of measuring electrical variables, measuring current/voltage, measuring devices, etc., to achieve clear physical concepts, strong versatility, and clear thinking

Active Publication Date: 2015-10-07
NORTH CHINA ELECTRIC POWER UNIV (BAODING)
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, there is no evaluation for current parameters

Method used

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  • Electric power system current quality assessment method
  • Electric power system current quality assessment method
  • Electric power system current quality assessment method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] Example 1: Single Phase System

[0027] Step 1: In each spectrum analysis time window T, collect the voltage v current signal i at the PCC point of the system;

[0028] Step 2: Perform Fourier decomposition of the collected voltage and current signals to obtain the waveform sets of voltage and current. Since the measurement window of 10 cycles is used in the calculation, the harmonic set N and interharmonics can be obtained at the same time Set N i , what is needed here are the harmonic and interharmonic subsets of the current and the harmonic subset of the voltage;

[0029] i = Σ n ∈ M i n - - - ( 1 )

[0030] I i g . n = ...

Embodiment 2

[0062] Example 2: Three-phase three-wire system

[0063] Step 1: In each spectrum analysis time window T, collect the voltage v at the PCC point of the system A , v B , v C and the current signal i A i B i C ;

[0064] Step 2: According to the voltage and current signals in the time window described in step 1, perform Fourier decomposition on the voltage and current signals to obtain the waveform set of voltage and current. Since the measurement window of 10 cycles is used in the calculation , so the harmonic set N and the interharmonic set N can be obtained at the same time i , what is needed here are the harmonic and interharmonic subsets of the current and the harmonic subset of the voltage;

[0065] i ⊥ = Σ n ∈ M i ⊥ n ( ⊥ = A ...

Embodiment 3

[0109] Example 3: Three-phase four-wire system

[0110] Step 1: In each spectrum analysis time window T, collect the voltage v at the PCC point of the system A , v B , v C and the current signal i A i B i C ;

[0111] Step 2: According to the voltage and current signals in the time window described in step 1, perform Fourier decomposition on the voltage and current signals to obtain the waveform set of voltage and current. Since the measurement window of 10 cycles is used in the calculation , so the harmonic set N and the interharmonic set N can be obtained at the same time i , what is needed here are the harmonic and interharmonic subsets of the current and the harmonic subset of the voltage;

[0112] i ⊥ = Σ n ∈ M i ⊥ n ( ⊥ = A ...

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Abstract

The invention belongs to the electric energy quality analysis field, especially an electric power system current quality assessment method. The method comprises: firstly, performing Fourier decomposition on the voltage and current detected at a PCC, and dividing a voltage subset and a current subset obtained after decomposition into a harmonic portion and an interharmonic portion; secondly, for the harmonic portion, based on the harmonic wave power direction of each frequency, calculating harmonic voltages and harmonic current to obtain a current component under each frequency, and decomposing active current, diffusion current, reactive current, unbalanced current, zero sequence current and generation current; and finally, calculating each current component to obtain required current quality assessment indicators, i.e., a rate of equipment utilization, system operation efficiency, reactive current, zero sequence current, unbalanced current, reactive current fluctuation quantity and frequentness, generation current, diffusion current and interharmonic current. The assessment indicators are corresponding with real current quality phenomena one by one; an assessment system has clear concepts, and can effectively assess current quality in real engineering.

Description

technical field [0001] The invention belongs to the field of power quality analysis, in particular to a method for evaluating the current quality of a power system. Background technique [0002] With the progress of the times, the role of power electronic devices in the process of power conversion and grid connection is becoming more and more important, and the scope of application is becoming wider and wider. However, at the same time, the use of these nonlinear devices has brought more Serious harmonic distortion and other power quality problems; in addition, the rapid development of high-speed rail technology and the single-phase nature of electric traction loads will also aggravate the three-phase imbalance of the power grid. The monitoring, evaluation and governance of the power quality of the power system are the links that cannot be ignored to ensure the normal operation of the power grid. [0003] At present, my country's power quality assessment system has been ini...

Claims

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Application Information

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IPC IPC(8): G01R19/00
Inventor 陶顺肖湘宁陈聪罗超魏天彩
Owner NORTH CHINA ELECTRIC POWER UNIV (BAODING)
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