Theoretical and Experimental Verification of Independent Control for Parallel-Connected Multi UPS(Rectifiers, Inverters and UPS)(<Special Section>the 25th International Telecommunications Energy Conference(INTELEC'03))

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概要

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• This paper proposes an independent control for parallel-connected multiple uninterruptible power supply (UPS) systems based upon a very simple control scheme. Here, the amplitude and phase angle of the output voltage are the controllable variables. With the only measurement of the output current, the active and reactive components are calculated to define the control variables. The entire system including the equations for the circuit, control and voltage limiters is well represented by a small-signal model, in which the computation of its eigenvalues constitutes the stability proof of the system. The root locus diagram gives an overall panorama of the system performance as a function of a certain gain and it aims to aid the further understanding and the design of the control. The experimental verification is carried out using a mere proportional-integral control scheme, which is a special case of the general control equation used in the theoretical analysis. For some situations, experiments show a flow of lateral current between UPS's, which causes an unbalanced current distribution. By increasing the proportional gain of the control equation for the output voltage amplitude, the lateral current can be substantially suppressed with a consequent improvement of the load sharing. Experimental results under various conditions show excellent results in terms of synchronization, load sharing and stability for three distinct output rating UPS's connected in parallel.

• 社団法人電子情報通信学会の論文
• 2004-12-01

著者

• Kawamura Atsuo

  Revision Of Advanced Physics Electrical And Computer Engineering Yokohama National University

• SATO Eduardo

  Division of Advanced Physics, Electrical and Computer Engineering, Yokohama National University

• Sato Eduardo

  Division Of Advanced Physics Electrical And Computer Engineering Yokohama National University

関連論文

• Theoretical and Experimental Verification of Independent Control for Parallel-Connected Multi UPS(Rectifiers, Inverters and UPS)(the 25th International Telecommunications Energy Conference(INTELEC'03))
• Lateral Current Reduction by Voltage Drop Compensator for Multiple Autonomously Controlled UPS Connected in Parallel
• Design of an Autonomous Control for Parallel-Connected Uninterruptible Power Supplies

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