Power system harmonic state estimation method based on automatic differentiation

A harmonic state estimation, power system technology, applied in harmonic reduction devices, AC networks to reduce harmonics/ripples, etc., can solve the problems of low efficiency, cumbersome and error-prone harmonic Jacobian matrix, etc.

Inactive Publication Date: 2012-08-01
HOHAI UNIV
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Problems solved by technology

This method applies the WLS method to nonlinear systems by linearizing the harmonic measurement function around the harmonic state estimate. The disadvantage of this method is the manual derivation of the differential formula and writing the differential code to calculate the harmonic Jacobian matrix. cumbersome and error-prone, low efficiency

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  • Power system harmonic state estimation method based on automatic differentiation
  • Power system harmonic state estimation method based on automatic differentiation
  • Power system harmonic state estimation method based on automatic differentiation

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[0028] The technical scheme of the present invention is described in detail below in conjunction with accompanying drawing:

[0029] Since G.T.Heydt of Purdue University in the United States first proposed the concept of harmonic state estimation for harmonic source identification in 1989, harmonic state estimation has aroused the interest of many scholars and power workers. Among them, the basic weighted least squares (WLS) harmonic state estimation algorithm, its basic idea is to use the minimum sum of squares of the difference between the harmonic quantity measurement and the harmonic estimated value as the target criterion. This approach applies the WLS method to nonlinear systems by linearizing the harmonic measurement functions around the harmonic state estimates. The power system harmonic state estimation method proposed by the present invention is based on the WLS harmonic state estimation method, and calculates the harmonic Jacobian matrix through AD instead of the tr...

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Abstract

The invention discloses a power system harmonic state estimation method based on an automatic differentiation. The automatic differentiation (AD) technology is applied to the power system harmonic state estimation. The method includes that firstly storage allocation is performed for the AD, live variables are described, a network parameter is obtained, a harmonic number is set, and a node admittance matrix of a harmonic is formed; then before iteration, positions and values of invariant elements in a jacobian matrix are stored in a linked list; and the iteration starts, the AD tool is used to calculate variable elements in the jacobian matrix, and simultaneously the invariant elements of the jacobian matrix in the linked list are read to obtain the jacobian matrix required by the harmonic state estimation. According to the power system harmonic state estimation method based on the automatic differentiation, traditional manual differential code writing is replaced by the AD to calculate the jacobian matrix, thereby handwritten code quantity is reduced, development efficiency of programs is increased, truncation error is effectively avoided, computational efficiency of algorithm is improved, and the power system harmonic state estimation method based on the automatic differentiation is convenient to implement on an existing state estimation software.

Description

technical field [0001] The invention relates to a method for estimating the harmonic state of a power system based on automatic differentiation, and belongs to the technical field of power system monitoring, analysis and control. Background technique [0002] With the continuous entry of high-voltage DC transmission, flexible AC transmission and customer power technology into engineering applications and the large increase in nonlinear loads such as electric arc furnaces and speed-regulating motors, more and more harmonics are injected into the power grid, making power system harmonics Power quality problems caused by pollution are becoming more and more serious. In order to effectively control harmonics, the distribution and state of power system harmonics must first be determined. However, it is impossible to install power quality monitoring devices on all nodes of interest. For this reason, it is necessary to estimate the harmonic voltage, current and power values ​​of t...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02J3/01
CPCY02E40/40
Inventor 杨雄卫志农孙永辉孙国强韦延方袁阳陆子刚刘玉娟潘春兰黄石卞栋
Owner HOHAI UNIV
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