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Article
STATCOM IMPACT ON DISTANCE RELAY PERFORMANCE
تأثير جهاز التعويض الساكن على اداء المناولة المسافية

Author: Qais M. Alias
Journal: DIYALA JOURNAL OF ENGINEERING SCIENCES مجلة ديالى للعلوم الهندسية ISSN: 19998716/26166909 Year: 2016 Volume: 9 Issue: 3 Pages: 59-70
Publisher: Diyala University جامعة ديالى

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Abstract

Flexible AC Transmission System devices provide for better utilization of already existing transmission systems as well as newly installed and upgraded systems. The use of such devices in the power transmission systems introduce new situations and variable operating conditions that need to be addressed in the fields of power system protection, system stability etc. In this work, the effect of introducing a STATCOM device in the send-end and mid-point of a moderately long transmission line is analyzed. The analysis concerns the effect of such device on the performance of the power line distance protection. Extensive series of various fault studies were conducted using MATLAB/SIMULINK models of a distance relay, STATCOM device, and the power transmission system under study. Obtained results confirmed the idea of varied apparent impedance seen by the distance relay. In conclusion a distance relay may not operate dependably in presence of STATCOM device without prior actions considered in the relay setting stages.

ان اجهزة نظم النقل المرن (FACTS)تدعم الاستخدام الامثل لانظمة نقل الطاقة الكهربائية المنشئة قديماً وحديثاً وانظمة القدرة المحدثة . ان استخدام مثل هذه الاجهزة في انظمة نقل الطاقة الكهربائية يؤدي الى حالات وظروف تشغيل جديدة موجبة ُالاخذ بنظر الاعتبار في مجال عديدة مثل حماية نظم القدرة, استقرارية نظم القدرة الخ.في هذا البحث, تم تحليل تاثير استخدام جهاز نظام نقل مرن ( STATCOM ) يربط في جهة الارسال او نقطة المنتصف لخط نقل قدرة طويل نوعا ما, على نظام الحماية المسافية لخط النقل. تم دراسة عدة حالات اخطاء باستخدام برنامج MATLAB/SIMULINK وذلك بواسطة استخدام نماذج لكل من, مناولة الحماية المسافية, جهاز ((STATCOM ونظام نقل القدرة المستخدمين في الدراسة. بينت النتائج تغير الممانعة الظاهرية المرئية من قبل مناولة الحماية المسافية وبالتالي امكانية التشغيل الغير معتمد للمناولة في حالة وجود مثل هذه الاجهزة ما لم يؤخذ ذلك بنظر الاعتبار مسبقا في مرحلة التعيير لمناولة الحماية المسافية.


Article
Reducing Short Circuit Level in 400kV Iraqi Grid System by Using FACTS Device

Authors: Mohanad Sh. Tarad Al-Aasam --- Inaam I. Ali
Journal: IRAQI JOURNAL OF COMPUTERS,COMMUNICATION AND CONTROL & SYSTEMS ENGINEERING المجلة العراقية لهندسة الحاسبات والاتصالات والسيطرة والنظم ISSN: 18119212 Year: 2019 Volume: 19 Issue: 2 Pages: 90-99
Publisher: University of Technology الجامعة التكنولوجية

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Abstract

Electrical power systems are different in their sizes because of their amount ofgeneration power stations, substations, transmission lines and loads. Therefore, thesefactors may impact on short circuit levels values. Capacity of power stations and dummytransmission lines in Extra high voltage grid (400kV) of the Iraqi Electrical power gridscause high short circuit levels values such that exceed both rating of the peak and breakingcapacity of switchgear equipment's. Reduction of short-circuit levels by using Fast-actingFlexible Alternating Current Transmission Systems (FACTS) types devices in power gridsmaintain the operation of power grids with acceptable value of short circuit levels for theirelectrical equipment's and preventing cascading event outages which may lead toblackouts. This paper mainly studies strategies on how to add Short Circuit Current Limiter(SCCL) device by determining its number, value and location of connection in power gridsby programing with (PSS™E version 30.3 Package Program). IEEE 25-bus system is usedfor testing the adding series SCCL at power transmission lines method procedure. Theresults of adding series SCCL with power transmission lines give significant reducing shortcircuit levels for the stations have highest short circuit levels in order to prevent theblackouts of overall power grid.

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