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Accurate linearization method of measurement equation for electric power system state estimation

A technique of measuring equations and state estimation, applied in computing, electrical digital data processing, special data processing applications, etc., capable of solving complex problems

Active Publication Date: 2012-12-19
TSINGHUA UNIV +1
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Problems solved by technology

[0012] Obviously, the existing state estimation models (2) and (3) are typical nonlinear optimization problems, and the solution of such nonlinear optimization problems is generally more complicated

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  • Accurate linearization method of measurement equation for electric power system state estimation
  • Accurate linearization method of measurement equation for electric power system state estimation
  • Accurate linearization method of measurement equation for electric power system state estimation

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Embodiment Construction

[0025]Embodiments of the present invention are described in detail below, examples of which are shown in the drawings, wherein the same or similar reference numerals designate the same or similar elements or elements having the same or similar functions throughout. The embodiments described below by referring to the figures are exemplary and are intended to explain the present invention and should not be construed as limiting the present invention.

[0026] Such as figure 1 As shown, the accurate linearization method of the power system state estimation measurement equation of the present invention comprises the following steps:

[0027] In step S101, a network model is established, and a node admittance matrix is ​​calculated.

[0028] Specifically, if the three-winding transformer in the network is equivalent to three two-winding transformers, then all the lines and transformers in the network can be represented by a unified π branch, as figure 2 shown. figure 2 middle,...

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Abstract

The invention provides an accurate linearization method of a measurement equation for electric power system state estimation. The accurate linearization method is characterized by including steps of establishing a network model and calculating a nodal admittance matrix; selecting state vectors and measurement vectors; and forming a jacobian matrix so as to get the accurately linearized measurement equation. The accurately linearized measurement equation is obtained by selecting the state vectors and the measurement vectors, and the state vectors can be solved by means of any types of existing state estimation according to the accurately linearized measurement equation, and estimation values such as all branch power and node injection power in the network can be acquired, so that complexity of the state estimation model is reduced greatly and the equation is easy to solve.

Description

technical field [0001] The invention relates to the field of power system scheduling automation, in particular to an accurate linearization method for power system state estimation measurement equations. Background technique [0002] The state estimation of power system is the basis and core of energy management system. Its main task is to provide the state variables (voltage amplitude and phase angle), branch power and Estimated value of node injection power, etc., also includes functions such as bad data detection and identification. [0003] Scholars and engineers at home and abroad have been researching power system state estimation for more than 40 years. Now almost every large-scale dispatch center has installed state estimation software. State estimation has become an indispensable cornerstone of modern dispatch control centers. one. Since the power outage in the United States and Canada occurred on August 14, 2003, people have further realized the basic status of s...

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Application Information

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IPC IPC(8): G06F19/00G06Q50/06
Inventor 刘锋陈艳波何光宇梅生伟黄良毅付艳兰
Owner TSINGHUA UNIV
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