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Rapid estimation method of maximum reactive power demand of 500kv radial power supply network load in disturbance recovery

A power supply network and load technology, applied in data processing applications, instruments, calculations, etc., can solve time-consuming and labor-intensive problems

Inactive Publication Date: 2018-10-26
GUANGDONG UNIV OF TECH
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The dynamic reactive power demand of this integrated load requires the help of power system calculation and analysis software to achieve a more accurate calculation, which is time-consuming and laborious

Method used

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  • Rapid estimation method of maximum reactive power demand of 500kv radial power supply network load in disturbance recovery
  • Rapid estimation method of maximum reactive power demand of 500kv radial power supply network load in disturbance recovery
  • Rapid estimation method of maximum reactive power demand of 500kv radial power supply network load in disturbance recovery

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Embodiment Construction

[0071] image 3 Shown is the system wiring and power flow diagram of the specific embodiment of the present invention: a typical operation situation of a 500kV substation with four 1000MVA main transformers in Guangdong Power Grid.

[0072] The short-circuit current of the 500kV power supply busbar is 40kA, which meets the short-circuit current control requirements of Guangdong power grid. The main transformer load rate is about 75%. The 500kV main transformer supplies power to six 220kV main transformers via three identical 220kV lines. Each 220kV line is 50km long, and the transmission flow is about 250MW, which supplies power to two 220kV transformers. The figure shows the operation of one of the 220kV lines in detail. The system power flow calculation results are as follows: image 3 As shown, the node voltages are all within a reasonable range, the transmission power flow of each circuit is reasonable, and the power factor meets the relevant operation and management re...

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Abstract

The invention discloses a quick estimation method for a load maximum reactive power command of a 500kv radial power supply network in disruption recovery. The method comprises the following steps: 1) calculating operating data under a steady-state condition: 1.1, calculating the equivalent impedance of a composite load of a main transformer; 1.2, calculating the equivalent impedance per unit value of an induction motor; 1.3, calculating the equivalent impedance of a constant impedance load; 2) calculating relevant parameters of an equivalent circuit of the 500kV transformer power supply network; 3) calculating relevant parameters at the fault clearing moment; 4) estimating 10kV bus voltages of 200kV and 110kV transformers at the fault clearing moment; and 5) estimating the maximum dynamic reactive power command of the composite load of the 500kV main transformer in recovery after the main network fault. The method needs a few basic data for calculation, and is quick, time-saving and labor-saving.

Description

technical field [0001] The present invention relates to a method for quickly estimating the maximum reactive power demand of a 500kV radial power supply network load during disturbance recovery, specifically referring to a method for estimating the maximum reactive power demand of a comprehensive load of a 500kV substation radial power supply network after a main network failure (approximately considered to occur at the time of fault removal) ) for a quick estimate. Background technique [0002] In the analysis and calculation of the power system, the innumerable power users in the vast area covered by the power grid are often combined into a small number of comprehensive loads, which are tapped on the buses of different voltage levels in the substation. In the study of power system voltage stability, the integrated load is often represented as a combination of constant impedance and induction motors with different proportions. [0003] When a short-circuit fault occurs on ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G06Q10/06G06Q50/06
Inventor 毛晓明吴杰康洪俊杰郭壮志
Owner GUANGDONG UNIV OF TECH
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