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A wlav Robust Estimation Method of Power System Based on admm

A power system and algorithm technology, applied in the direction of electrical components, circuit devices, AC network circuits, etc., can solve the problems of increasing computational complexity, limiting applications, and low computational efficiency, so as to preserve estimation accuracy, maintain tolerance performance, and reduce Calculate the effect of time

Active Publication Date: 2018-09-21
HOHAI UNIV
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Problems solved by technology

WLAV improves the accuracy of state estimation at the cost of increasing computational complexity. However, compared with WLS estimator, the lower computational efficiency also limits its application in engineering practice to some extent.

Method used

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  • A wlav Robust Estimation Method of Power System Based on admm
  • A wlav Robust Estimation Method of Power System Based on admm
  • A wlav Robust Estimation Method of Power System Based on admm

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Embodiment Construction

[0054] Below in conjunction with accompanying drawing, the technical process of invention is described in detail:

[0055] Introduction to ADMM

[0056] ADMM algorithm can be divided into general form and compressed form from the form, the form and solution steps of the two are slightly different, but the essence is the same. The following will mainly introduce the optimization objective and solution steps of ADMM.

[0057] ADMM essentially solves an optimization problem with equality constraints. For solving an optimization problem of the following form

[0058] min f(x)+g(z)

[0059] s.t.Ax+Bz=c;

[0060] In the formula: x, z are optimization variables, A, B are constant matrices, and c is a constant vector.

[0061] The augmented Lagrange function of the above formula is:

[0062]

[0063] Where: y T is the Lagrangian multiplier, and ρ is the penalty factor.

[0064] Based on ADMM solution, the solution steps of the above formula are:

[0065]

[0066]

[006...

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Abstract

The invention discloses a power system WLAV robust estimation method based on ADMM. By means of standard measurement noise and a linear measurement equation based on a Newton method, the power system WLAV robust estimation method converts a WLAV robust estimation model into a optimization problem with equality constraint and achieves decoupling solution of a state variable and an auxiliary variable step by step by means of ADMM solution so as to greatly shorten WLAV calculating time and maintain estimation precision. An IEEE standard system test result manifests that compared with PDIPM, the ADMM greatly improves WLAV estimation efficiency and maintains basic robust performance of the WLAV. The power system WLAV robust estimation method provides technical support and guarantee for WLAV robust estimation engineering practicality.

Description

technical field [0001] The invention relates to an ADMM-based power system WLAV tolerance estimation method, belonging to the technical field of power system monitoring, analysis and control. Background technique [0002] State estimation estimates the real-time operating state of the power system based on telemetry raw data. Based on the results of state estimation, the energy management system (EMS) performs a series of follow-up analysis and calculation of advanced application software (including real-time scheduling, optimal control, Safety analysis, etc.), so state estimation is a crucial part of EMS. The traditional weighted least squares (weighted least estimation, WLS) estimation can efficiently estimate the best state of the system when the measurement noise obeys a strict Gaussian distribution. However, due to the aging of measuring instruments, long-distance transmission of data, and even bad data injected maliciously by humans, it is inevitable that the estimate...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02J3/00
Inventor 陈胜卫志农孙国强孙永辉臧海祥朱瑛陈霜张思德周佳伟
Owner HOHAI UNIV
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