다른 정격용량을 가진 3상 UPS 시스템의 병렬운전을 위한 주종제어 기법

A Master and Slave Control Strategy for Parallel Operation of Three-Phase UPS Systems with Different Ratings

  • 발행 : 2004.08.01

초록

본 논문에서는 전체 시스템의 용량 증대와 부하 중요도에 따른 신뢰성 향상을 위해 사용되는 UPS 병렬 운전시 발생하는 문제점을 해석하고, 이를 해결하기 위해 기존에 연구되어온 다양한 제어기법들을 조사하였다. 또한 기존의 연구방법에서 적용할 수 없었던 다른 정격의 병력 운전 적용시 L, C 출력필터에 의한 문제점을 해결하기 위해 주종 제어를 이용한 3상 UPS의 전류 분달 제어기법이 연구되었다. 제안된 제어 알고리즘의 타당성을 검증하기 위해 시뮬레이션 및 실험을 수행하였다.

A parallel operation of Uninterruptible Power Supply(UPS) systems is used to increase power capacity of the system or to secure higher reliability at critical loads. In the conventional parallel operation, the load-sharing control to maintain the current balance is the most important, since the load-sharing is very sensitive to discord between components of each module, amplitude/phase difference, line impedance, output LC filter, and so on. To solve these problems various control algorithms are researching. However, these methods cannot apply to the different ratings of UPS. In the case, master and slave control algorithm for parallel operation is adequate. However, if the UPS ratings are different, the value of passive filters L, C is different, and it affects the sharing of current. This paper presents general problems of conventional parallel operation systems, and control strategy for parallel operation with different ratings. The validity of the proposed control strategy is investigated through simulation and experiment in the parallel operation system with two 3-phase UPS systems.

키워드

참고문헌

  1. Converters, Applications. and Designs Power Electronics Ned Mohan;Tore M. Undeland;William P. Robbins
  2. IEEE Int. Conference on Power Electronics and Drive Systems, PEDS '99 v.2 Parallel operation control technique of voltage source inverters in UPS D. Shanxu;M. Yu;X. Jian;K. Young;C. Jian
  3. Applied Power Electronics Conference and Exposition, 1998. APEC 98' Conference Proceedings 1998., Thirteenth Annual v.1 Control of parallel inverters in distributed ac power systems with consideration of the line impedance effect A. Tuladhar;H. Jin;T. Uger;K. Mauch
  4. Industrial Electronics Society, IECON'2000 v.4 Wireless parallel operation control of a two-module UPS system for equivalent load sharing T. G. Koo;Y. B. Byun;K. Y. Joe;J. I. Seo;D. H. Kim;C. U. Kim
  5. IEEE Trans. Ind. Applicat v.24 no.2 Parallel operation of voltage source inverters T. Kawabata;S. Higashino
  6. IEEE Applied Power Electronics Conference and Exposition, APEC'97 v.1 Parallel operation of single phase inverter modules with no control interconnections A. Tuladhar;H. Jin;T. Unger;K. Mauch
  7. Industrial Electronics, IEEE Transactions on v.37 no.Issue. 6 Multi-Inverter UPS system with redundant load sharing control J. Holtz;K. H. Werner
  8. The Korean Institute of Power Electronics, 2002 Power Electronics Autumn Conference The Parallel Operation Control Technique of UPS System Sang-Hoon Lee;Woo-cheol Lee;Kyong-Hwan Kim;Dong-Seok Hyun
  9. Power Electronics, IEEE Transactions on v.10 no.Issue.5 Combination voltage controlled and current- controlled PWM inverter for UPS parallel operation J. F. Chen;C. L. Chu
  10. KIEE Transactions on v.50B no.7 Output LC filter design for UPS inverter considering the response of system J. S. Kim;S. H. Lee;J. H. Choi