A Method of Grid Equivalence

A power grid and dynamic equivalent technology, applied in the field of value, can solve the problems of not fully reflecting the characteristics of the near-end and remote systems, and the large amount of calculation, to achieve the effect of clear thinking, good operating characteristics, and simple principles

Inactive Publication Date: 2011-12-14
HUAZHONG UNIV OF SCI & TECH +1
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  • Abstract
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Problems solved by technology

The first two methods have several common problems: a large amount of calculation; need to know all the data of the external system
The equivalent structure of the estimated equivalent method is mainly to simply divide the power system into the research system and the external system, and the equivalent results of the external system cannot fully reflect the characteristics of the near-end and remote systems.

Method used

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  • A Method of Grid Equivalence
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Embodiment Construction

[0018] In the present invention, the system equivalent outside the generator set to be studied is the parallel system of the infinite busbar and the dynamic unit, such as figure 1 shown.

[0019] ●The equation of the infinite bus equivalent model is as follows:

[0020] V · t = V · s + j I · s x s

[0021] The terminal voltage phasor of the generator to be studied

[0022] Infinite bus equivalent voltage V s the phasor

[0023] j: unit of imaginary part

[0024] The current phasor of the generator to be studied flowing to the equivalent infinite bus

[0025] x s : Infinite busbar equivalent reactance

[0026] Required equivalent parameter: V s , x s

[0027] V s : equivalent voltage of infinite busba...

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Abstract

The invention provides a power grid equivalence method by which an exterior system of a generator set to be researched can be simplified and a remote complicated large power grid and a near bus set are equivalent to an infinite bus and a dynamic set respectively. The method is applicable to aspects such as modeling parameter time domain verification of an excitation system and parameter optimization of a power supply stabilizer (PSS), so that the characteristic of the exterior system can be represented better; and the simulation calculation of a power system is simplified and the simulation calculation precision is improved.

Description

technical field [0001] The invention belongs to the technical field of electrical engineering, and in particular relates to a grid equivalent method, which can perform grid equivalents on complex power systems other than generators to be studied to simplify calculation models. Background technique [0002] With the development of the power system, the scale of the power grid is becoming more and more complex, and the capacity of the single machine is getting larger and larger, which makes improving the transient stability of the power system one of the most important tasks in the current power system. At present, there are mainly two methods for power system transient analysis, the real-time domain simulation method and the direct method. However, due to the complex structure, characteristics and operation mode of the power system, the transient process is strongly nonlinear, which makes the simulation calculation extremely demanding on the computer and takes a long time. ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02J3/00G06F19/00
Inventor 毛承雄姜曼徐友平陆继明柴继勇李京晓张锳
Owner HUAZHONG UNIV OF SCI & TECH
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