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Load security domain researching method based on voltage level restraint

A voltage level, safety domain technology, applied in the research field of load safety domain based on voltage level constraints, can solve problems such as the reduction of system safety level

Active Publication Date: 2011-01-12
CHANGSHA UNIVERSITY OF SCIENCE AND TECHNOLOGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The actual system operates in a normal state most of the time, and generally can withstand accidental accidents without exceeding the constraints; only in the case of harsh environments or increased operating constraints, the system safety level is gradually reduced

Method used

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  • Load security domain researching method based on voltage level restraint
  • Load security domain researching method based on voltage level restraint
  • Load security domain researching method based on voltage level restraint

Examples

Experimental program
Comparison scheme
Effect test

Embodiment Construction

[0013] 1. Impedance value under voltage level constraints

[0014] use figure 1 Simplify the two-node system model, let the equivalent power supply be Thevenin equivalent impedance is Z f , the load node voltage is The load impedance is Z L = R L +jX L .

[0015] Thevenin equivalent model total impedance

[0016] Z ∑ = Z f +Z L (1)

[0017] In the R-X coordinate system, let Z f : {(0, 0), (R f , X f )}, then draw the impedance Z L ,Z ∑ The phasor diagram for figure 2 .

[0018] Suppose R L and x L Both are free to change, and the value range of load impedance is calculated according to the constraint of load node voltage level. If the Thevenin equivalent potential E is known, the constraint value of the load node voltage level is U 2 .

[0019] Depend on figure 1 Available

[0020] U · = I ...

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PUM

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Abstract

In fact, a system runs normally for most of the time, only when the security level of the system is reduced to enter the alert condition, the re-appeared accident can enable the equipment to be overloaded and enable the system to enter the emergency state; therefore, before entering the voltage alert state, judging the load power safety margin of the current operation is more meaningful. From the thought, according to a load security domain researching method based on voltage level restraint of the invention, the load impedance range is computed according to a The venin equivalent model and an online equivalent parameter under a given voltage level restraint so as to obtain a load apparent power security domain under the current operation state and give the most dangerous growth manner of the apparent power in the security domain. The method is simple, practical, clear in physical significance, and convenient to perform online voltage / load control by the operator and maintain the favorable operation state of the system.

Description

technical field [0001] Safe operation and control of power system voltage and load. Background technique [0002] Due to the nonlinear characteristics of the system, the coupling between state quantities and the load characteristics, etc., it is difficult to determine the static stability limit voltage online. The P-V curve method and the Q-V curve method are based on the idea of ​​decoupling P and Q, and the stable voltage limit points obtained are not the same; the power flow method relies on an accurate model of the system, and it is difficult to solve the ill-conditioned power flow near the limit point, and it is impossible to identify the type of instability; Voltage stability index L based on line local information P , L q , F VSI , I PN , L QN , L PP and L QP etc., are obtained by transforming the power equation in various forms and based on the condition that the quadratic equation has a solution. The analysis found that the state variables and coefficients i...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02J3/00
Inventor 竺炜陶琼
Owner CHANGSHA UNIVERSITY OF SCIENCE AND TECHNOLOGY