Adaptive static VAR controller for simultaneous elimination of voltage flickers and phase current imbalances due to arc furnaces loads

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• 作者：El-Saady ; Gaber
• 关键词：Arc furnaces ; Static VAR compensators ; Load balancing ; Voltage stability
• 刊名：Electric Power Systems Research
• 出版年：2001
• 出版时间：July 20, 2001
• 年：2001
• 卷：58
• 期：3
• 页码：133-140
• 全文大小：378 K

文摘

The present paper aims at utilizing the Static VAR Compensator SVC for simultaneously load balancing and voltage flicker elimination due to arc furnace loads. The SVC of thyristor controlled reactor-fixed capacitor TCR-FC type is considered. The effective susceptance of SVC is controlled and adapted by varying the thyristors firing delay angle. The three-phase imbalanced currents of arc furnace load is balanced by adjusting the effective susceptance of SVC Further, at the same time, the voltage oscillations due to arc furnace load currents are eliminated by updating the thyristor firing delay angle of SVC. An equivalent power system comprises a constant voltage source connected to arc furnace load through transmission system and step down transformer. The proposed SVC is connected at the terminal of the arc furnace load. To validate the effectiveness of the SVC in sense of load current balancing, improvement of power factor, and voltage flicker elimination due to arc furnace load, the above power system is simulated digitally over a wide range of arc resistances. The digital simulation results prove the power of SVC in terms of a constant terminal voltage and three-phase balanced unity power factor line currents with varying arc furnace currents.