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Flexible extrapolation method under out-of-step center machine group intrusion based on thyristor controlled series compensation parameter adjustment

An out-of-synchronization center and parameter adjustment technology, which is applied in the direction of AC network circuits, electrical components, circuit devices, etc., can solve problems such as unit exit, auxiliary machine exit, and system safety, and achieve the effect of strong practicability and convenient data acquisition

Active Publication Date: 2019-11-08
CHINA THREE GORGES UNIV
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Problems solved by technology

[0004] When the system is out of step, the out-of-step center invades the inside of the cluster, which will lead to the shutdown of multi-unit out-of-step protection, or the withdrawal of auxiliary machines due to low voltage in the power plant, which will lead to the withdrawal of a large number of units and seriously affect the safety of the system. This invention aims to solve the problem The problem is: how to make the out-of-synchronization center flexibly push out to the inside of the cluster without losing the generator set and load, so as to provide guarantee for the normal operation of the cluster

Method used

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  • Flexible extrapolation method under out-of-step center machine group intrusion based on thyristor controlled series compensation parameter adjustment
  • Flexible extrapolation method under out-of-step center machine group intrusion based on thyristor controlled series compensation parameter adjustment
  • Flexible extrapolation method under out-of-step center machine group intrusion based on thyristor controlled series compensation parameter adjustment

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Embodiment Construction

[0035] In order to better understand and implement the present invention, the present invention will be further described below in conjunction with the accompanying drawings.

[0036] The present invention provides a flexible extrapolation method based on controllable serial compensation parameter adjustment under the out-of-step center intrusion cluster, the formula flow is as follows figure 1 shown, including the following steps:

[0037] Step 1, the multi-machine parallel delivery system is equivalent to an equivalent two-machine system, figure 2 n sets of machine clusters run in parallel, X d ', X T are the equivalent reactance of generator and transformer respectively. It is connected to the receiving end system through the same pole double circuit line L1 and L2 with TCSC device installed at the end. The system is equivalent as follows: multiple parallel units use one equivalent, and its equivalent potential and reactance use E G ' and X GTIndicates that the doubl...

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Abstract

The invention provides a flexible extrapolation method under out-of-step center machine group intrusion based on thyristor controlled series compensation parameter adjustment. The method is characterized by, under the internal scene of out-of-step center machine group intrusion, calculating system voltage distribution, determining an out-of-step center position coefficient equation, calculating and adjusting reactance parameters of a TCSC (thyristor controlled series compensation) device, verifying non-parallel resonance and transient stability of the system, determining a specific trigger angle adjustment scheme of the TCSC device and realizing out-of-step center machine group extrapolation. The method is a flexible control strategy without loss of units and load, is simple and reliable in principle and does not cause system instability, and is easy to realize in electric power engineering.

Description

technical field [0001] The invention relates to the fields of relay protection and safety and stability control of electric power systems, and in particular to a flexible extrapolation method based on controllable series compensation parameter adjustment for out-of-step center intrusion into clusters. Background technique [0002] With the development and utilization of large-scale hydropower and wind power, coupled thermal power transmission from west to east has become the main trend of domestic power development. As a result, the scale of power grid interconnection is expanding day by day, and the operation mode of power grid often appears unexpected. For large-scale power generation centralized outbound bases, such as the Three Gorges water and thermal power outbound base and the Northwest wind and thermal power outbound base, after the complex large power grid is disturbed by serious faults, the system oscillation is subject to unexpected changes in the operation mode, w...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02J3/38
CPCH02J3/381Y02E40/10
Inventor 李振兴王振宇谢志豪万勇李振华翁汉琍徐艳春
Owner CHINA THREE GORGES UNIV
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