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Method for establishing controllable serial compensation linearized model

A linearization and model technology, applied in flexible AC transmission system, reactive power adjustment/elimination/compensation, etc., can solve the problems that affect the accuracy of analysis results, cannot reflect the complex electromagnetic transient process, and the switching characteristics of power electronic devices are not accurate. Continuity and other problems, to achieve a good effect of suppressing the effect of subsynchronous resonance

Active Publication Date: 2014-01-01
NORTH CHINA ELECTRIC POWER UNIV (BAODING)
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Problems solved by technology

In essence, the switching characteristics of power electronic devices are discontinuous in the time domain, which brings certain difficulties to the application of the characteristic analysis method for system dynamic stability analysis.
In this regard, the traditional method is to use the quasi-steady-state mathematical model of the controllable series compensation. This model simplifies the slow dynamic characteristics of the controllable series compensation and cannot reflect the complex electromagnetic transient process inside the device. Its use will affect the Accuracy of Analysis Results

Method used

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  • Method for establishing controllable serial compensation linearized model
  • Method for establishing controllable serial compensation linearized model
  • Method for establishing controllable serial compensation linearized model

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Embodiment Construction

[0020] The implementation technical solutions of the present invention will be described more clearly below in conjunction with the accompanying drawings and the description of the embodiments.

[0021] figure 1 The single-phase circuit structure of TCSC is given, which is composed of a pair of anti-parallel thyristors connected with inductors and then paralleled with capacitors. Due to the switching properties of thyristors, the dynamic characteristics of the entire circuit include continuous characteristics (capacitor voltage) and discrete events (thyristor firing). In order to establish a continuous mathematical model of TCSC, the effect of thyristor triggering on the capacitor voltage must be considered.

[0022] When the thyristor is fully turned on, TCSC is equivalent to a parallel LC circuit, and its characteristics can be described by formula (1):

[0023] C dV dt ...

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Abstract

The invention discloses a method for establishing a controllable serial compensation linearized model, which belongs to the technical field of electric system modeling. The method comprises the following steps of: forecasting the voltage value of a capacitor after a half power-frequency period by utilizing a Poincare mapping theory according to the current line current, the triggering angle and the capacitor voltage of a TCSC (Thyristor Controlled Series Capacitor), and then fitting a waveform curve of the capacitor voltage of the TCSC by using the data as sampling values, thereby obtaining a mathematical model for describing the dynamic properties of the TCSC. Because the data have a small sampling period, and each power-frequency period has two sampling points, the mathematical model is effective in the range of 0-50Hz and is suitable for analyzing the subsynchronous resonance process of a system with the TCSC in a characteristic analysis method. The mathematical model obtained by the invention can be matched with a system characteristic root equation.

Description

technical field [0001] The invention belongs to the field of dynamic stability research of electric power system. In particular, it relates to a method for establishing a controllable series compensation linearization model. Specifically, the method is a controllable series compensation linearization model that is established based on Poincare mapping and can be interfaced with the system characteristic root equation. It is used for controllable series compensation Small-disturbance stability analysis of the power system. Background technique [0002] The unbalanced distribution of resources and loads in our country determines the inevitability of cross-regional flow of energy resources. Ultra-high voltage, large-scale, and long-distance power transmission can realize optimal allocation of resources nationwide and ensure national energy security. In order to improve the transmission capacity of transmission lines and relieve the pressure on transmission corridors, controlla...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02J3/18
CPCY02E40/14Y02E40/10
Inventor 毕天姝肖仕武张魁张鹏薛安成杨奇逊
Owner NORTH CHINA ELECTRIC POWER UNIV (BAODING)
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