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Observability analyzing method in power grid harmonic state estimation

A technique of harmonic state estimation and analysis method, applied in AC network to reduce harmonic/ripple, harmonic reduction device, etc., can solve problems such as incomplete observability of the system, measurement-state equation underdetermination, etc.

Inactive Publication Date: 2014-07-02
UNIV OF JINAN +2
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Problems solved by technology

In harmonic state estimation, since the number of measurements is usually smaller than the number of state quantities, the measurement-state equation is underdetermined and the system is not completely observable
This becomes a prominent difficulty in harmonic state estimation

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  • Observability analyzing method in power grid harmonic state estimation
  • Observability analyzing method in power grid harmonic state estimation
  • Observability analyzing method in power grid harmonic state estimation

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Embodiment Construction

[0093] The present invention will be further described below in conjunction with the accompanying drawings and embodiments.

[0094] The present invention has carried out three researches on the observability analysis part in the harmonic state estimation:

[0095] Firstly, by reducing the number of state variables, the measurement-state equation is changed from underdetermined to overdetermined or even overdetermined. For the linear measurement-state equation, on the premise that the system is only observable, reducing the number of state quantities means reducing the number of minimum measurements. In literature [8], the characteristic that the harmonic current injected into the non-harmonic source bus is zero is used, and the number of state variables is reduced to the number of buses that may be the harmonic source bus through equation transformation. It is usually considered that the non-harmonic source bus is the bus without load, but when combined with the actual syste...

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Abstract

The invention discloses an observability analyzing method in power grid harmonic state estimation. The method comprises the steps that 1) mathematical analysis and actual power grid analysis are combined, from the angle of reducing the quantity of state, an equation is changed to be exactly-determined or overdetermined from underdetermined, and the number of measuring devices is greatly reduced on the premise of guaranteeing complete observability of a system state; 2) an SVD method is applied to judgment and calculation of the observable part of a system; 3) the defects of a traditional algebraic method in observability analysis are overcome, the matrix conditional number is combined, a practical linearly independent sorting method is provided and is used for guiding adjustment and addition of the measuring devices of an unobservable system, and the good observability of the system is achieved. Redundancy measuring in the system is found. A measuring mounting point enabling a system measuring-state matrix to be benign is found within the system range. The reservation problem of a decimal point in practical engineering and the problem that a calculation result is unreliable due to the matrix morbidity condition in the calculation process are solved.

Description

technical field [0001] The invention relates to an observability analysis method in power grid harmonic state estimation. Background technique [0002] The proposal of harmonic state estimation is to solve the problem of solving the harmonic state of the system when the position and type of the harmonic source in the power system are unknown. The basic principle is: by measuring the local limited measurement points of the power grid, according to the obtained measurement data, a mathematical model is established to solve the harmonic state of the whole network. At present, with the development trend of the whole network of harmonic sources, the disadvantages of the harmonic power flow analysis method in solving the harmonic state of the power grid are becoming increasingly prominent. Therefore, many scholars at home and abroad have successively studied the harmonic state estimation method. The main difference between harmonic state estimation and traditional state estimatio...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02J3/01
CPCY02E40/40
Inventor 程新功侯广松欧朱建徐珂宗西举王成友任宏伟张静亮李石清殷文月邵振振丁冬睿王玉真于明珠
Owner UNIV OF JINAN
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