Study on Approach of Static Security Assessment Accounting for Electro-thermal Coupling

Mengxia Wang,Qiang Zhang,Jinxin Huang,Hongbin Sun

doi:10.4236/epe.2013.54b136

Abstract

A static security assessment approach considering electro-thermal coupling of transmission lines is proposed in this paper. Combined with the dynamic thermal rating technology and energy forecasting, the approach can track both the electrical variables and transmission lines’ temperature varying trajectory under anticipated contingencies. Accordingly, it identifies the serious contingencies by transmission lines’ temperature violation rather than its power flow, in this case the time margin of temperature rising under each serious contingency can be provided to operators as warning information and some unnecessary security control can also be avoided. Finally, numerical simulations are carried out to testify the validity of the proposed approach.

Highlights

As an indispensable technology to guarantee the security operation of power grid, the on-line static security assessment (SSA) has been being focused by both academic and engineering circles [1,2,3]
Thermal limit of transmission line has been being converted into limit on power flow or current in SSA, and the asynchronous between temperature and current of transmission line is always ignored, this should be improved under new situation
There are two major reasons motivate the improvement: (1) With the rapid increase of electric power generation & demand, the transfer capability of power grid is being pushed to its thermal limit, the traditional SSA which ignores the thermal inertia tends to impede the efficient utilization of the existing transfer capability of power grid

Summary

Introduction

As an indispensable technology to guarantee the security operation of power grid, the on-line static security assessment (SSA) has been being focused by both academic and engineering circles [1,2,3]. It takes charge of screening the anticipated contingencies, identifying serious ones which cause voltage or thermal violation and providing warning information to operators as the important basis for making preventive control decision for the serious contingencies. The approach is proposed to realize the fast screening of anticipated contingencies with temperature variation calculation

Framework of On-line Electro-thermal Coupling Security Analysis

Approach of Security Assessment Considering Electro-thermal Coupling

Case Study

Scene 1

Scene 2

Conclusions