Multi-harmonic source identification method for power distribution network

An identification method and multi-harmonic source technology, applied in the measurement of electrical variables, electrical digital data processing, calculation models, etc., can solve the estimation result deviation, harmonic current amplitude and sequence uncertainty, algorithm separation performance impact, etc. problem, to achieve the effect of simple algorithm, accurate harmonic current and fast convergence speed

CN108170885AInactive Publication Date: 2018-06-15STATE GRID GRID GANSU ELECTRIC POWER CO QINGYANG POWER SUPPLY CO
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
Publication Date
2018-06-15
Estimated Expiration
Not applicable · inactive patent

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Abstract

The invention relates to a multi-harmonic source identification method for a power distribution network. The method comprises the following steps of (1) placing a phasor measurement unit (PMU) in thepower distribution network; (2) performing optimization configuration of the PMU on the power distribution network: determining a mathematic model of PMU optimization configuration; solving the mathematic model of the PMU optimization configuration by utilizing a binary imperialist competitive algorithm to obtain an optimization configuration scheme of the PMU; (3) obtaining harmonic voltage Vh data in a period of time at a node for configuring the PMU in the power distribution network; (4) obtaining a fast change component Vh.fast in a harmonic voltage Vh by using a mobile filter; (5) preprocessing Vh, namely, performing centralization processing and whitening processing; and (6) applying the fast change component Vh.fast to an improved independent component analysis algorithm, determining a separation matrix, and enabling the separation matrix to act on the harmonic voltage Vh for separation to obtain harmonic currents Ih injected into the power distribution network. The method has the characteristics of systematization and accurate estimation result, and can be used for the multi-harmonic source identification process under unknown harmonic impedance in the actual power distribution network.
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Description

technical field

[0001] The invention relates to the field of power quality analysis and control, in particular to a multi-harmonic source identification method in a distribution network. Background technique

[0002] Electric energy has become one of the indispensable and important energy sources in modern human society because of its advantages of being economical, practical, clean and controllable, and convenient for transmission. As a special commodity, electric energy also emphasizes quality. High-quality electric energy supply not only ensures the safe, economical and efficient operation of the power system, but also guarantees the normal production of enterprises, which is an important prerequisite for improving people's living standards. Since the beginning of the 21st century, the demand for electricity has continued to grow, and new types of power loads have also developed rapidly. This has brought unprecedented opportunities to the development of modern power grids...

Examples

Embodiment Construction

[0041] A method for identifying multi-harmonic sources in a power distribution network, comprising the following steps:

[0042] (1) Place the harmonic measurement device PMU in the distribution network.

[0043] Phasor Measurement Unit (PMU) is a phasor measurement device based on GPS technology. It has been used as a harmonic measurement information acquisition device because of its synchronous measurement function of multiple measurement points. However, the PMU is expensive , only if the PMUs are reasonably configured in the distribution network, the system can be guaranteed to be considerable under the condition of installing fewer PMUs.

[0044] (2) Optimal configuration of PMU for distribution network:

[0045] On the premise that the network harmonic state can be observed, the number of configuration measurement points is the smallest, and the redundancy of each node is the goal, the mathematical model of the optimal configuration of the PMU is determined; the optimal...