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Power distribution network state estimation method fusing distributed generation characteristics

A technology of distributed power supply and state estimation, applied in computing, electrical digital data processing, special data processing applications, etc., can solve the problems of Jacobian matrix and information matrix not being constant and large amount of calculation.

Inactive Publication Date: 2014-12-03
STATE GRID CORP OF CHINA +2
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Problems solved by technology

The advantage of using the voltage amplitude and phase angle of the node as the state quantity is that it can handle various measurements very well and does not need special treatment for weak rings, but the Jacobian matrix and information matrix are not constant, and the amount of calculation is large

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  • Power distribution network state estimation method fusing distributed generation characteristics
  • Power distribution network state estimation method fusing distributed generation characteristics
  • Power distribution network state estimation method fusing distributed generation characteristics

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Embodiment Construction

[0050] The specific implementation manners of the present invention will be further described in detail below in conjunction with the accompanying drawings.

[0051] The present invention utilizes the physical principle that the reactive power of the asynchronous generator and the synchronous generator is equal to the reactive power injected into the network, forms an equality constraint, and establishes a least squares state estimation model containing the equality constraint; utilizes the Lagrangian multiplier method Find the extreme value of the least squares model with equality constraints, establish the extreme value solution model with the mathematical solution method of the extreme value function, and eliminate the Lagrangian coefficient in the extreme value solution model to obtain the The extreme value solution model solves the problem that the calculation amount is affected by too many equality constraints.

[0052] Among them, the terms and definitions included in t...

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Abstract

The invention relates to a power distribution network state estimation method fusing distributed generation characteristics. The power distribution network state estimation method includes (1) establishing a relationship between idle work and voltage of asynchronous and synchronous generators; (2) establishing equality constraint conditions; (3) establishing a minimum least-squares state estimation model containing equality constraint; (4) solving the minimum least-squares state estimation model containing equality constraint to obtain corrected values of quantity of state; (5) correcting the quantity of state of a power distribution network according to the corrected values of the quantity of state to obtain new quantity of state; (6) judging whether an absolute value of the difference between corrected values of the quantity of state in the current iteration and the last iteration is smaller than a set threshold value, ending steps if the absolute vale is smaller than the set threshold value, and otherwise, returning to step (4). The power distribution network state estimation method fusing the distributed generation characteristics is not affected by the number of distributed generations in the power distribution network, the power distribution network state estimation method is universal, and problems such as instable data due to the fact that equality constraint is used as large weight for measurement are avoided.

Description

technical field [0001] The invention belongs to a state estimation method of a distribution network, and in particular relates to a state estimation method of a distribution network which integrates characteristics of distributed power sources. Background technique [0002] In recent years, the large-scale access of distributed power sources in the distribution network poses challenges to the operation and control of the distribution system. In order to improve the safety and economy of the distribution system operation, it is necessary to Provide accurate basic data for network analysis and decision-making. [0003] In view of the characteristics of distribution network measurement configuration less, network topology is mainly radial, weak ring and three-phase unbalanced, at present, the state estimation of distribution network is based on node voltage, branch complex current, branch power, node The complex current is injected as the state quantity, and state estimation m...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G06F19/00
Inventor 王少芳刘广一郎燕生郭昆亚刘升姜万超徐杰李海阳邹昱白洋王淼
Owner STATE GRID CORP OF CHINA
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