Distribution network sensitivity calculating method based on linearized power flow

A calculation method and distribution network technology, applied to AC network circuits, AC networks with the same frequency from different sources, circuit devices, etc., can solve problems such as failure to meet application needs, poor accuracy of distribution networks, etc.

Active Publication Date: 2018-04-24
JILIN PROVINCE ELECTRIC POWER RES INST OF JILIN ELECTRIC POWER CO LTD +2
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Problems solved by technology

[0005] At present, the main sensitivity method is the sensitivity calculation method based on the fast decomposition power flow algorithm, which uses the decoupling characteristics of active power and reactive power to calculate the sensitivity, but this method has poor accuracy in the distribution network and cannot meet the application needs

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  • Distribution network sensitivity calculating method based on linearized power flow
  • Distribution network sensitivity calculating method based on linearized power flow
  • Distribution network sensitivity calculating method based on linearized power flow

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Embodiment Construction

[0060] A distribution network sensitivity calculation method based on linearized power flow proposed by the present invention will be further described in detail below in conjunction with the accompanying drawings and specific embodiments.

[0061] A distribution network sensitivity calculation method based on linearized power flow proposed by the present invention, the overall process is as follows figure 1 shown, including the following steps:

[0062] 1) Assuming that the radial distribution network to be calculated for sensitivity has N+1 nodes, where the root node number is 0, starting from the root node, the end nodes of each branch are numbered from 1 to N in turn, Then the number of distribution network branches is N;

[0063] 2) Randomly select a node from the nodes numbered 1 to N and mark it as k, the branch formed by this node and its upstream node i is marked as ik, and calculate the three-phase branch power flow equation of node k and branch ik;

[0064] as f...

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Abstract

The invention relates to a distribution network sensitivity calculating method based on a linearized power flow, and belongs to the technical field of power system operation control. On the basis of the conventional linear equation without considering the network loss and interphase mutual impedance, a nonlinear network loss item is linearly expanded and contained in the equation, and a linearizedpower flow equation of a three-phase branch circuit is established. According to variations of active power and reactive power of all nodes, the variations of the active power and the reactive powerof the branch circuit and variation of node voltage are calculated so as to obtain the sensitivity of the branch circuit power and the node voltage relative to node injection. Compared with the powerflow equation without considering the network loss, the distribution network sensitivity calculating method provided by the invention has the advantages as follows: the calculation accuracy is improved and the calculation is rapid; the distribution network sensitivity calculating method is applicable to real-time online analysis of a distribution network and other scenes.

Description

technical field [0001] The invention relates to a linearized power flow-based distribution network sensitivity calculation method, which belongs to the technical field of power system operation control. Background technique [0002] In the power system, it is often necessary to analyze how other variables will change after some current variables change, such as how adjusting the generator output power will affect the node voltage, etc. With the help of the sensitivity coefficient, the relationship between the variables of interest can be described The local linear relationship of simplifies these analysis tasks. [0003] In recent years, a large amount of renewable energy has been incorporated into the distribution network in the form of distributed power, which puts forward higher requirements for the operation and management of the distribution network. The analysis and calculation of sensitivity is an important part of it. It is widely used in security analysis, optimal ...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02J3/06H02J3/26
CPCH02J3/06H02J3/26H02J2203/20Y02E40/50
Inventor 吴文传常学飞张伯明高长征杨越王佳蕊李德鑫吕项羽
Owner JILIN PROVINCE ELECTRIC POWER RES INST OF JILIN ELECTRIC POWER CO LTD
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