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Method and device for estimating harmonic state of electric power system

A power system and harmonic state technology, applied in harmonic reduction devices, measuring electricity, measuring electrical variables, etc., can solve the problems of not considering the voltage and current measurement capabilities of the measuring equipment, complex algorithms, and large amount of calculation. The increase in the number of node voltages, the small amount of calculation, and the effect of increasing the number

Active Publication Date: 2013-09-25
NORTH CHINA ELECTRICAL POWER RES INST
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Problems solved by technology

[0006] The embodiment of the present invention provides a method and system for estimating the state of harmonics in a power system. By introducing suspicious harmonic injection nodes into the logical judgment method of observability analysis, a recursive algorithm is used to realize the analysis of the entire network, and the system according to different user needs is realized. The optimal configuration of the measurement points solves the problems of complex algorithms, large amount of calculation and no consideration of the measurement equipment having the ability to measure voltage and current in the prior art

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  • Method and device for estimating harmonic state of electric power system
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  • Method and device for estimating harmonic state of electric power system

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[0019] The following will clearly and completely describe the technical solutions in the embodiments of the present invention with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only some, not all, embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without making creative efforts belong to the protection scope of the present invention.

[0020] The following first introduces the observability analysis method, which refers to the ability to determine the bus status using existing measurement data under the premise of a given network topology and measurement configuration.

[0021] The mathematical model of harmonic state estimation is expressed as

[0022] Z=HX+ε

[0023] Among them, X is an undetermined n×1-dimensional state vector, Z is an m×1-dimensional measurement phasor, H is an m×n-dime...

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Abstract

The invention provides a method and device for estimating the harmonic state of an electric power system. The method includes the steps of collecting network topology information corresponding to the electric power system, collecting measuring point position information in the electric power system, collecting measuring point harmonic information in the electric power system, making network topology observability analysis and determining the observability range in the current electric power system according to the network topology information, the measuring point position information and the measuring point harmonic information, and determining a harmonic state parameter corresponding to the current electric power system according to the observability range in the current electric power system. Suspicious harmonic injection nodes are led to an observability analytic logical judgment method, the whole network analysis is achieved by the adoption of a recursive algorithm, measuring point optimal allocation is achieved according to different user needs, and the problems that the algorithm is complex, the calculated quantity is large, and the fact that a measurement device has voltage and current measuring capacity at the same time is not considered in the prior art are solved.

Description

technical field [0001] The present invention relates to the field of power system planning, in particular to the optimal configuration of the power system, specifically a method and equipment for estimating the harmonic state of the power system. Background technique [0002] In recent years, with the rapid development of modern industry and the wide application of power electronics technology, the harmonics generated by a large number of power electronic devices, nonlinear fluctuating loads and various frequency conversion speed control devices have become increasingly serious pollution to the power system and threaten the power system. Safe and economical operation of various electrical equipment in the power grid. Therefore, it is of great practical significance to analyze and study the harmonics of the power system. [0003] The key to Harmonic State Estimation (HSE) technology lies in network observability analysis and optimal configuration of measurement equipment. S...

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Application Information

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IPC IPC(8): G01R31/00G01R23/16
CPCY02E40/40
Inventor 蔡维贺惠民杨洪耕锁娟王建伟邓春刘小江
Owner NORTH CHINA ELECTRICAL POWER RES INST
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