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Direct calculation method based on ring network power system

A power system, direct calculation technology, applied to AC network circuits, circuit devices, AC networks with the same frequency from different sources, etc.

Active Publication Date: 2017-02-22
邓宏伟
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  • Application Information

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Problems solved by technology

The disadvantage of the iterative method is that it needs to continuously use the old value of the variable to recurse the new value, and the final calculation result has a large error and low accuracy; , you need to re-select the value and then calculate, the operation speed is slow, and the operation result may not converge. The operation principle is as follows figure 1 In addition, the applicability of the iterative method is not strong, especially not suitable for large networks, and different power system networks need to use different ways to iterate
In the existing technology, there are defects such as large error, slow calculation speed, and sometimes non-convergence in the power flow calculation of the power system ring network

Method used

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  • Direct calculation method based on ring network power system
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  • Direct calculation method based on ring network power system

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Embodiment 1

[0107] In this embodiment, the components in the power network are first described in conjunction with the accompanying drawings:

[0108] Such as figure 2 As shown, the general principle for the line:

[0109] according to

[0110] but

[0111] Such as image 3 As shown, for the distribution parameter principle of the line:

[0112] according to

[0113] but

[0114] Such as Figure 4 As shown, for the load:

[0115] according to have to

[0116] but

[0117] I represents the load operating current

[0118] Such as Figure 5 As shown, for the transformer:

[0119] Transformer, the transformer takes a double-turn transformer as an example. When it comes to a three-turn transformer, it can also be calculated as three double-turn transformers:

[0120] according to have to

[0121] but

[0122] In practical applications, the actual double-turn transformer can be regarded as a parallel connection of a load, a line and an ideal double-turn trans...

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Abstract

The invention discloses a direct calculation method based on a ring network power system. The direct calculation method mainly settles problems of large calculation result error, no convergence, low calculation speed and the like in an iterative method in which an existing power flow algorithm is applied. The direct calculation method for calculating the total matrix of a whole electric power system network comprises the steps of (11), calculating the matrix of each node; and (12), multiplexing the matrix of each node according to the connecting sequence of the nodes for acquiring the total matrix of the electric power system network. The nodes comprise basic nodes which are composed of single elements, chain type nodes which respectively correspond with a chain that is composed of a plurality of basic nodes, basic ring network nodes which respectively correspond with a basic ring network that is composed of a plurality of chain type nodes, and combined ring network nodes which respectively correspond with a combined ring network that is formed through connecting a plurality of basic ring network nodes and chain type nodes.

Description

technical field [0001] The invention relates to the field of power flow calculation of a power system, in particular to a direct calculation method of a power system with a ring network. Background technique [0002] Power system power flow calculation is a basic electrical calculation to study the steady state operation of power system. Its task is to determine the operating state of the entire system according to the given operating conditions and network structure, such as the voltage (amplitude and phase angle) on each bus, power distribution and power loss in the network, etc. The result of power system power flow calculation is the basis of power system stability calculation and fault analysis. In the prior art, the power system power flow calculation method usually adopts the iterative method, also known as the rolling method, which is a process of continuously using the old value of the variable to recurse the new value. It utilizes the fast computer operation speed...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02J3/06
CPCH02J3/06H02J2203/20
Inventor 邓宏伟
Owner 邓宏伟
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