초전도 에너지 저장 장치용 3상 사이리스터 브리지의 비대칭 제어에 관한 연구
Asymmetric control of a three-phase thyristor bridge for superconducting magnetic energy storage
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초록
3상 사이리스터 브리지 회로는 AC-DC 변환장치, 대형 모터의 가역속도 조정, 에너지 저장 장치 등 전압과 전류 제어의 여러 분야에서 사용되고 있다. 에너지 저장 장치에서는 현재까지 개발된 여러 가지 대용량 에너지 저장 장치들 중 초전도 에너지 저장 장치 (Superconducting Magnet Energy Storage, SMES)는 상대적으로 에너지 저장용량이 크고 응답속도가 빨라서 오랜 시간동안 잦은 충·방전이 요구되는 시스템에 적용하기에 적합하다. 그리고 전력변환기인 사이리스터 브리지를 대칭 제어하는 대신 비대칭 제어를 하면 상대적으로 평균 출력전압은 감소하지만 유효전력을 최대화하면서 무효전력을 최소화 시켜 역률을 증가시킬 수 있다. 따라서 SMES용 3상 사이리스터 브리지에서 점호되는 각을 대칭 또는 비대칭 제어함으로써 특징을 비교 분석하였고 에너지를 SMES에 저장하고 회생 시에는 저장된 에너지를 입력 전원 측에 공급하게 된다. 본 논문에서는 SMES에 에너지를 저장하기 위한 전력변환기인 3상 사이리스터에서 비대칭 제어를 함으로써 무효전력을 최소화 시켜 역률을 증가시킬 수 있는 방법에 대하여 연구하였다.
Abstract
In a general three-phase thyristor bridge, circuits are used in various fields of voltage and current control such as AC–DC converter, reversible speed adjustment of large motors, and energy storage device. Among the various energy storage devices developed thus far, superconducting energy storage devices have a relatively large energy storage capacity and high response speed, which makes them suitable for systems requiring frequent charge and discharge over a long period. In a superconducting magnet energy storage (SMES) three-phase thyristor bridge circuit, energy is stored in the SMES through symmetrical or asymmetrical control of the alpha angles at which thyristors are turned on, and reverse voltage is generated during the period in which regenerated energy is supplied to the power supply side. This study describes the control characteristics of a power converter for SMES. We studied a method to increase the power factor by minimizing the reactive power through asymmetric control in a three-phase thyristor bridge circuit, which is apowerconverter for storing energy in SMES.
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