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Robust state estimation method in mixed integer quadratic programming mode

A robust state estimation, mixed integer quadratic technology, applied in the direction of AC network circuits, electrical components, circuit devices, etc., can solve the problems of affecting applications and insufficient calculation efficiency.

Active Publication Date: 2016-04-20
NORTH CHINA ELECTRIC POWER UNIV (BAODING) +2
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Problems solved by technology

However, these robust state estimation methods generally have the characteristics of insufficient computational efficiency, which affects their application in practical systems to a certain extent.

Method used

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  • Robust state estimation method in mixed integer quadratic programming mode
  • Robust state estimation method in mixed integer quadratic programming mode
  • Robust state estimation method in mixed integer quadratic programming mode

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Embodiment Construction

[0039] The embodiments will be described in detail below in conjunction with the accompanying drawings.

[0040] The present invention proposes a robust state estimation method in the form of mixed integer quadratic programming, such as figure 1 shown, including:

[0041] Step 1. Express the voltage vector of node i in the form of Cartesian coordinates to obtain the injected active power and injected reactive power of node i;

[0042] Step 2, such as figure 2 As shown, if three equivalent two-winding transformers are used to represent a three-winding transformer, then all branches in the power system network are represented by a unified π-shaped branch, and the left and right ends of the π-shaped branch are nodes i to At node j, the lower left and right ends of the π-shaped branch are respectively grounded;

[0043] Step 3, if image 3 As shown, according to the equivalent circuit diagram of the π-type branch, the active power and reactive power of the branch from node i ...

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Abstract

The invention, which belongs to the technical field of automatic scheduling automation field of the power system, especially relates to a robust state estimation method in a mixed integer quadratic programming mode. The method comprises: a voltage vector a node i is expressed in a right-angle coordinate mode and an injected active power and an injected reactive power of the node i are obtained; three equivalent two-winding transformers are used for expressing a three-winding transformer and all branch circuits in the power system network are expressed by using a unified pi type branch circuit; according to an equivalence circuit graph of the pi type branch circuit, branch circuit active powers and reactive powers from the node i to a node j as well as a voltage amplitude measurement equation of the node i are obtained, and a robust state estimation model in a mixed integer quadratic programming mode is also obtained; an initial value of an MIQCP robust state estimation model is obtained by using a WLS state estimation method; the MIQCP robust state estimation model is resolved and a defective measurement value is found and eliminated; and the corrected measurement value is calculated again by using the WLS state estimation method.

Description

technical field [0001] The invention belongs to the technical field of electric power system automatic dispatching, and in particular relates to a mixed integer quadratic programming form robust state estimation method (RobustStateEstimationUsingMixedIntegerProgrammingWithQuadraticConstraints, MIQCP). Background technique [0002] Power system state estimation can realize comprehensive, real-time and accurate perception of the entire power system. On this basis, dispatchers can realize accurate prediction, precise decision-making and precise control of the entire power system. Now every large-scale dispatching center at home and abroad has basically installed a state estimator, and state estimation has become the cornerstone of the safe operation of the power grid. Since state estimation was first proposed by foreign scholars in 1970, people have studied and applied state estimation for more than 40 years, and various state estimation methods have emerged during this period....

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02J3/00
CPCH02J3/00H02J2203/20
Inventor 陈艳波韩子娇马进张璞董鹤楠于普瑶韩通
Owner NORTH CHINA ELECTRIC POWER UNIV (BAODING)
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