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Simulation method of substation equipment security analysis after extra-high voltage capacity expansion

A simulation method and substation technology, applied in the direction of measuring electricity, measuring electrical variables, measuring devices, etc., can solve problems such as lack of data processing capabilities, and achieve the effect of ensuring safe and stable operation and correct control

Active Publication Date: 2014-05-28
STATE GRID CORP OF CHINA +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The PSCAD program only has the simulation function of the power system, and lacks further processing capabilities for the output data; the MATLAB program can program and process the existing data according to the needs of users, but it needs other simulation software to provide simulation data for it
Therefore, the existing software lacks the ability to simulate and output data, and process the data according to user needs to obtain results.

Method used

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  • Simulation method of substation equipment security analysis after extra-high voltage capacity expansion
  • Simulation method of substation equipment security analysis after extra-high voltage capacity expansion
  • Simulation method of substation equipment security analysis after extra-high voltage capacity expansion

Examples

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Embodiment

[0042] The equivalent model of an actual power station and its regional power grid after UHV capacity increase built by PSCAD. The steady-state simulation of the model is carried out, and the voltage waveform of the No. 1 main transformer of a substation under the steady-state operation after UHV capacity increase is obtained as follows: image 3 shown. From this figure, the instantaneous voltage values ​​of the lead-out wires on the three sides of the transformer can be obtained. If the upper and lower limits of the stable operating voltage are 0.95 to 1.05 times the rated value, then the instantaneous voltage values ​​of the three sides are all within this range, and the transformer is in a normal working state.

[0043] The No. 1 main transformer of the substation is set with a phase A short-circuit ground fault on the medium voltage side, and the voltage waveforms on the three sides are as follows: Figure 4 shown. In the fault state, the phase voltage values ​​on the th...

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Abstract

The invention relates to a simulation method of substation equipment security analysis after extra-high voltage capacity expansion. The simulation method comprises the following steps: step one, constructing a equivalent network model by adopting a PSCAD (power system computer aided design) according to trend data of an actual power grid, wherein the equivalent network model comprises a load model, an alternating current power transmission line model, a generator model and a transformer model; step two, simulating the PSCAD equivalent network model under a steady state condition and a fault condition to obtain steady-state voltage current data and over-voltage and over-current data, analyzing running states of main equipment under the steady state condition and the fault condition; step three, reading in the over-voltage, over-current data output by the PSCAD under various fault conditions by using MATLAB (matrix laboratory) software, programming to analyze the running states of secondary equipment. The influence on the primary equipment and the secondary equipment of a substation at an extra-high voltage environment is researched, the safe running of the main equipment and the accurate control of the secondary equipment are guaranteed and the safe and stable running of an extra-high voltage power grid is guaranteed.

Description

technical field [0001] The invention relates to the intersection field of UHV power transmission and power system software simulation, in particular to a simulation method for safety analysis of substation equipment after UHV capacity increase. Background technique [0002] PSCAD / EMTDC (Power Systems Computer Aided Design / Electro-Magnetic Transient In DC System) is an electromagnetic transient simulation software widely used in power systems in the world. EMTDC is a set of electromagnetic transient simulation program, and PSCAD is its user interface. PSCAD is a powerful and fully integrated drawing interface, which is the window for users to connect with EMTDC. On this interface, the actual system can be simulated to draw the simulation system and simulate it. For result analysis, the results can be output by using curves or measurement tables, and the simulation results can be seen intuitively from the simulation interface. EMTDC is the core program of PSCAD simulation, ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01R31/00
Inventor 蒲天骄董雷田爱忠范征李丹
Owner STATE GRID CORP OF CHINA
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