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A Grid Voltage Stability Assessment Method Considering Motor Load

A grid voltage and voltage stabilization technology, applied in electrical digital data processing, special data processing applications, instruments, etc., can solve the problems of long time and large amount of calculation, and achieve the effect of shortening time and amount of calculation

Active Publication Date: 2017-10-17
STATE GRID CORP OF CHINA +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

In the engineering practical algorithm, the calculation of the voltage stability power transmission limit considering the motor load mainly depends on the power system simulation software such as BPA, etc., and the post-accident limit value is calculated by increasing the load level, which requires a large amount of calculation and takes a long time

Method used

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  • A Grid Voltage Stability Assessment Method Considering Motor Load
  • A Grid Voltage Stability Assessment Method Considering Motor Load
  • A Grid Voltage Stability Assessment Method Considering Motor Load

Examples

Experimental program
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Effect test

Embodiment

[0118] Such as Figure 7 , using PSD-BPA to build the generator-load AC system model, the system capacity is set to 100MVA, the load adopts 100% motor model, and the bus bar at the generator outlet side is short-circuited to obtain I 1 I 2 32.25p.u, X L1 is 0.03p.u, according to equations (2) and (3), the equivalent reactance of the grid side is 0.001p.u, and the equivalent electromotive force of the grid side is 0.999p.u.

[0119] In the simulation, a motor with a reference capacity of 1000MW is selected as the research object, and its equivalent circuit parameters adopt typical parameters, which are based on the capacity of the motor itself, and the per-unit values ​​of each parameter are shown in Table 1:

[0120] Table 1

[0121] R S

X S

X M

R R

X R

0.02

0.18

3.49

0.02

0.12

[0122] So you can get:

[0123]

[0124] The equivalent reactance X of the transmission channel after the N-1 accident occurred on the line L2 ...

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Abstract

The invention provides a network voltage stability evaluation method considering motor load. Load in a power network comprises motor load and constant-impedance load. The evaluation method specifically comprises the following steps: determining a power transmission channel equivalent parameter; determining a motor load equivalent parameter; determining the power stable active power extreme value of the load; and evaluating network voltage stability according to the voltage stable active power extreme value of the load. According to the network voltage stability evaluation method considering the motor load provided by the invention, the network voltage stability can be evaluated under the situation of considering the motor load, so that the bus loading capability which is more fitted with a practical power network is provided for power personnel, and safe and stable running of the power network is ensured.

Description

technical field [0001] The invention belongs to the technical field of power systems, and in particular relates to a grid voltage stability evaluation method considering motor loads. Background technique [0002] Voltage stability refers to the ability of the system to maintain or restore stable voltage after a small or large disturbance, including static voltage stability and transient voltage stability, and the static voltage stability requirement is the first thing the system needs to meet. The so-called static voltage stability refers to the slow increase of the load that causes the voltage at the bus terminal of the load to drop slowly, and the voltage instability when it reaches the critical capacity of bearing the load, and the power angle and frequency do not change significantly during the entire voltage drop process. The purpose of its calculation and analysis is to study whether the system can guarantee voltage stability and the power transmission limit of the sys...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G06F19/00
Inventor 陆勇张文朝郑广君王卫潘艳
Owner STATE GRID CORP OF CHINA
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