Proceedings of the KIEE Conference (대한전기학회:학술대회논문집)

The Korean Institute of Electrical Engineers (대한전기학회)
권호 표지

The Control of Parallel Operation for Static UPSs

Static UPS 병렬운전 제어

  • Kim, D.U. (Mabook-Ri Research Institute, Hyundai Heavy Industries Co., Ltd.) ;
  • Kim, Y.P. (Mabook-Ri Research Institute, Hyundai Heavy Industries Co., Ltd.) ;
  • Shin, H.J. (Mabook-Ri Research Institute, Hyundai Heavy Industries Co., Ltd.) ;
  • Baek, B.S. (Mabook-Ri Research Institute, Hyundai Heavy Industries Co., Ltd.) ;
  • Ryu, S.P. (Mabook-Ri Research Institute, Hyundai Heavy Industries Co., Ltd.) ;
  • Min, B.G. (Mabook-Ri Research Institute, Hyundai Heavy Industries Co., Ltd.)
  • 김동욱 (현대중공공업(주) 마북리 연구소) ;
  • 김연풍 (현대중공공업(주) 마북리 연구소) ;
  • 신현주 (현대중공공업(주) 마북리 연구소) ;
  • 백병산 (현대중공공업(주) 마북리 연구소) ;
  • 류승표 (현대중공공업(주) 마북리 연구소) ;
  • 민병권 (현대중공공업(주) 마북리 연구소)
  • Published : 1998.07.20
Download PDF
⟨ Previous Next ⟩

Abstract

An uninterruptible power supply(UPS) with parallel operation is used to increase the power capacity of the system or to secure higher reliability at critical loads. In the parallel operating system composed of the multiple UPSs, load-sharing, i.e. current balance control between them is key technique. Because of its low impedance and quick response characteristics, inverter output current changes very rapidly and thereby easily researches an overload condition. The difference between total load current divided by number of operating inverters and its own current is detected as unbalanced current. Then frequency and voltage are controlled to minimize the active component and the reactive component. A good performance of the proposed load-sharing technique is verified by experiments in the parallel operating system with two 40kVA UPSs.

Keywords