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Method for evaluating non-linear dynamic state with loading voltage characteristics

A technology of nonlinear dynamic and voltage characteristics, applied in the direction of calculation, measurement of current/voltage, electrical components, etc., can solve problems such as no consideration

Inactive Publication Date: 2007-11-21
ZHEJIANG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, this method does not consider the measurement error problem caused by the change of the load due to the change of the voltage of the unobservable node when the operating condition of the system changes greatly.

Method used

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  • Method for evaluating non-linear dynamic state with loading voltage characteristics
  • Method for evaluating non-linear dynamic state with loading voltage characteristics
  • Method for evaluating non-linear dynamic state with loading voltage characteristics

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0056] Use PSAT 1.3.3 software to simulate the jumper situation when the line (5, 6) is at 1.25S, and use the voltage measurements of nodes 4 and 8 to dynamically estimate the voltage of node 5. A load of P+jQ=4+j2 is loaded on node 5 . All loads in the IEEE 39 system use the ZIP load model, and its parameters are set as:

[0057] CP 1 = CQ 1 = 0 CP 2 = CQ 2 = 10 CP 3 = CQ 3 = 90

[0058] That is, constant impedance load: constant current load: constant power load = 0:10:90. The convergence accuracy...

Embodiment 2

[0064] Also use PSAT software to simulate the jumper situation when the line (3, 4) is at 1.25S, and use the voltage measurement values ​​of node 4 and node 17 to dynamically estimate the voltage of node 3 and node 18. There is no load attached to node 5. All loads in the IEEE 39 system use the ZIP load model, and its parameter settings are the same as the previous example.

[0065] Also firstly need to simulate the sampling process of SCADA data. After collecting one set of data at each of the 10 different operating state points before the failure, the load characteristic parameters of node 3 and node 18 were identified using the least square method, and the identification results were as follows:

[0066] CP 1 3 = 0.01 CP 2 ...

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Abstract

This is a nonlinear dynamic state estimation method based combined measurement by PMU and SCADA. A static module is established on the history data of SCADA. In case of non-measurement for part of nodes, conduct an accurate measure on adjacent nodes by PMU. An estimation on the non-measured nodes is made by Gauss-Seidel method.

Description

technical field [0001] The invention belongs to the technical field of power system safety defense, and in particular relates to a nonlinear dynamic state estimation algorithm considering load voltage characteristics. Background technique [0002] In recent years, many large-scale power outages have occurred around the world, which has aroused people's attention on the prevention and control of large-scale catastrophes in large-scale power systems. The wide-area measurement system (WAMS) based on the global positioning system (global positioning system, GPS) is a new technology developed in recent years. Accurately measure the bus voltage generator power angle in the network and monitor the whole network in real time. [0003] In actual engineering, the change of power network topology and PMU failure may lead to the loss of observability in some areas of the power grid, which in turn affects the normal work of other monitoring systems based on WAMS information. At present...

Claims

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Application Information

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IPC IPC(8): H02J3/00H02J13/00G06F17/00G06Q50/00G01R19/00G06F19/00
Inventor 曹一家陈晓刚王绍部郭创新
Owner ZHEJIANG UNIV
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