Universal small signal modeling method used for power system secondary synchronous oscillation analysis

A subsynchronous oscillation and power system technology, applied in the direction of reducing/preventing power oscillation, electrical components, circuit devices, etc., can solve the problems of wind turbine shutdown, unclear general small signal modeling method, crowbar circuit damage, etc., to achieve Easy to access, avoid mathematical formula derivation, and easy classification

Active Publication Date: 2018-10-16
SHANGHAI JIAO TONG UNIV +1
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Problems solved by technology

In 2009, due to the interaction between a wind farm and the series compensation capacitor on the sending line, the wind turbine was shut down and the crowbar circuit was damaged. This is the first new energy-induced subsynchronous oscillation accident reported in the world.
A general small-signal modeling approach for power system subsynchronous oscillation analysis remains unclear

Method used

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  • Universal small signal modeling method used for power system secondary synchronous oscillation analysis
  • Universal small signal modeling method used for power system secondary synchronous oscillation analysis
  • Universal small signal modeling method used for power system secondary synchronous oscillation analysis

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specific Embodiment approach

[0046] The specific implementation mode that the present invention adopts is:

[0047] A small signal modeling method for power system subsynchronous oscillation analysis, characterized in that it includes:

[0048] Step 1. Decompose the components of the target power system to obtain the components that need to be modeled;

[0049] Step 2. Establish a mathematical model for the components that need to be modeled, and obtain the state space model of each component;

[0050] Step 3. Classify the power system component models to obtain two types of models;

[0051] Step 4. According to the connection relationship of the models, the component models are combined into a complete system model by referring to the combination method between the two types of models.

[0052] In the step 1, the power system components are decomposed according to the primary system, and the secondary system part belongs to the primary system components controlled by it. Common decomposed power system...

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Abstract

The invention provides a universal small signal modeling method used for power system secondary synchronous oscillation analysis. The universal small signal modeling method comprises the following steps of performing element disassembling on a target power system to obtain elements which need modeling; establishing a mathematical model for the elements which need modeling to obtain a state space model of each element; performing sorting on power system element models to obtain two types of models; and according to a model connecting relationship, enabling the element models to be connected into a complete system model according to a connecting method between the two types of models. The universal small signal modeling method is simple and easy to realize, and applicable to secondary synchronous oscillation researching and modeling of all power systems; simple and convenient sorting of the secondary synchronous oscillation system element models is proposed; an element model interface isprovided, so that complex mathematical formula derivation is avoided, and connection between elements can be realized directly; and a standard modeling interface is provided, so that access of a newsystem model can be realized conveniently, and an important value for secondary synchronous oscillation researching of the power system is realized.

Description

technical field [0001] The invention relates to the field of safety and stability of electric power systems, in particular to a general small-signal modeling method for power system subsynchronous oscillation analysis. Background technique [0002] In recent years, with the rapid development of wind power large-scale centralized development and utilization, many subsynchronous oscillation (SSO) events have occurred in engineering practice, and subsynchronous oscillation has become a wind power grid-connected stability issue that has received special attention. In 2009, due to the interaction between a wind farm and the series compensation capacitor on the sending line, the wind turbine was shut down and the crowbar circuit was damaged. This is the first new energy-induced subsynchronous oscillation accident reported in the world. In 2011, a group of wind farms also had several unplanned downtime accidents of multiple wind turbines caused by subsynchronous oscillation. In 20...

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Application Information

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IPC IPC(8): H02J3/00H02J3/24
CPCH02J3/00H02J3/24H02J2203/20
Inventor 王西田刘时雨解大
Owner SHANGHAI JIAO TONG UNIV
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