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Evaluation method of overall process dynamic voltage stabilization margin based on time domain simulation

A technology of dynamic voltage and stability margin, which is applied in the field of whole-process dynamic voltage stability margin evaluation based on time-domain simulation, can solve problems such as truncation error, and achieve high calculation accuracy, good computability, and good wide adaptability sexual effect

Active Publication Date: 2013-10-02
STATE GRID CORP OF CHINA +1
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Problems solved by technology

[0020] (4) Truncation error

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  • Evaluation method of overall process dynamic voltage stabilization margin based on time domain simulation
  • Evaluation method of overall process dynamic voltage stabilization margin based on time domain simulation
  • Evaluation method of overall process dynamic voltage stabilization margin based on time domain simulation

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Embodiment Construction

[0073] The specific implementation manners of the present invention will be further described in detail below in conjunction with the accompanying drawings.

[0074] In this embodiment, the actual system of Liaoning power grid is used as a simulation example to calculate the dynamic margin to further illustrate the implementation steps of this method:

[0075] (1) Establish a simulation model of the Northeast Power Grid, generate power flow and stability files for calculation; determine the system load model as "50% constant impedance + 50% induction motor".

[0076] (2) Power flow calculation and generate result files.

[0077] (3) Stable calculation. In the case of no fault in the system, the Liaoning power grid is selected as the load growth area, and the load growth rate is 1% of the normal mode of growth per second; the initial value t of the load continuous growth time T 0 = 60s.

[0078] Through the simulation calculation, the sustainable increase time T of the load ...

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Abstract

The invention provides an evaluation method of an overall process dynamic voltage stabilization margin based on time domain simulation. The method comprises the steps that (1) a network topology and a system dynamic element model are constructed according to a computation requirement; a tidal stream file and a stable file required by system computation are established; element parameters are input according to actual conditions of a system; (2) tidal stream data is read in; a tidal stream solution is computed; a destination file is generated; (3) stable data is read in; a fault type and a load growth area or a bus name and a load growth rate are determined; action modes of dynamic elements such as a load, a ULTC (under load tap changer) and overexictation limitation are considered; a fault card and a load growth control statement are filled in; stability computation is performed; and (4) result analysis is performed according to the sustainable load growth time obtained according to simulation computation. According to the evaluation method, a result of successive action of load growth and the generator overexictation limitation or the ULTC can be computed, and a result of synchronous action of each element can be obtained, so that a simulation result can correspond with actual running conditions more.

Description

technical field [0001] The invention belongs to the field of power system simulation and calculation, and in particular relates to a whole-process dynamic voltage stability margin evaluation method based on time-domain simulation. Background technique [0002] In the power system, the margin index is often used to measure the stability of the system. The so-called margin index refers to starting from the given operating state of the system, according to a certain mode, gradually approaching the voltage collapse point through the increase of load or transmission power, and the current operating state of the system. The distance from the point to the voltage collapse point can be used as an indicator of the degree of voltage stability. The margin index has the following advantages: It can provide operators with a more intuitive measurement of the distance between the current operating point of the system and the voltage collapse point; the distance between the system operating...

Claims

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Application Information

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IPC IPC(8): G06F19/00
Inventor 张艳萍张健张鑫陈予尧
Owner STATE GRID CORP OF CHINA
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