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A Whole Process Dynamic Voltage Stability Margin Evaluation Method Based on Time Domain Simulation

A dynamic voltage and stability margin technology, which is applied in the field of full-process dynamic voltage stability margin evaluation based on time domain simulation, can solve problems such as truncation errors, and achieve high calculation accuracy, wide application range, and clear physical concepts. Effect

Active Publication Date: 2017-12-26
STATE GRID CORP OF CHINA +1
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Problems solved by technology

[0021] (4) Truncation error

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  • A Whole Process Dynamic Voltage Stability Margin Evaluation Method Based on Time Domain Simulation
  • A Whole Process Dynamic Voltage Stability Margin Evaluation Method Based on Time Domain Simulation
  • A Whole Process Dynamic Voltage Stability Margin Evaluation Method Based on Time Domain Simulation

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Embodiment Construction

[0075] The specific implementation manners of the present invention will be further described in detail below in conjunction with the accompanying drawings.

[0076] 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:

[0077] (1) Establish a simulation model of the Northeast power grid, and generate power flow and stability files for calculation; determine the system load model as "50% constant impedance + 50% induction motor".

[0078] (2) Power flow calculation, generate result files.

[0079] (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.

[0080] Through the simulation calculation, the sustainable increase time T of the load...

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Abstract

The present invention proposes a whole-process dynamic voltage stability margin evaluation method based on time-domain simulation. The steps are as follows: (1) Build network topology and system dynamic component models according to calculation requirements, establish power flow and stability files required for system calculation, and According to the actual situation of the system, input the component parameters; (2) read in the power flow data, calculate the power flow solution and generate the result file; (3) read in the stable data, determine the fault type, the area or bus name of the load increase, and the rate of the load increase, Consider the action mode of dynamic components such as load, ULTC, excitation overexcitation limit, etc., fill in the fault card and load growth control statement, and perform stability calculation; (4) Analyze the results based on the sustainable growth time of the load obtained from the simulation calculation. The invention can not only calculate the result of sequential action of load growth and generator overexcitation limit or ULTC, but also obtain the result of synchronous action of each element, so that the simulation result is more in line with the actual operation situation.

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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Patent Type & Authority Patents(China)
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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