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A Study on the Parallel Operation Control Technique of On-line UPS System  

곽철훈 (세미크론㈜ STACK 사업부)
최규하 (건국대 전기공학과)
Publication Information
The Transactions of the Korean Institute of Power Electronics / v.8, no.6, 2003 , pp. 585-592 More about this Journal
Abstract
The parallel operation system of UPS is used to increase reliability of power source at critical load. But parallel UPS system has a few defects, impedance is different from each other and circulating current occurs between UPSs, due to line impedance and parameter variation, though controlled by the same synchronization signal. According to such characteristic of parallel UPS, balanced load-sharing control is the most important technique in parallel UPS operation. In this paper, a novel power deviation compensation algorithm is proposed. it is composed of voltage controller to compensate power deviation that be calculated by using active and reactive current deviation between Inverters on synchronous d-q reference frame.
Keywords
line impedance and parameter variation; though controlled by the same synchronization signal; Balanced load-sharing control;
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