탭 변환 단권변압기 기반 LVRT/HVRT 시험장비의임피던스 설계
Impedance design of tap changing auto transformer based LVRT/HVRT test device
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초록
본 논문은 계통 연계 기준인 Low Voltage Ride Through(LVRT) 및 High Voltage Ride Through(HVRT) 기능을 평가하기 위한 시험 장비의 임피던스 설계 방법을 제안한다. LVRT/HVRT 시험 장비는 계통 연계 규정에 명시되어 있는 계통 사고전압을 일정시간 동안 발생시킬 수 있어야 하며 설계 사양에 맞게 사고전류의 크기를 제한해야 한다. 본 논문에서는LVRT/HVRT 동작 시 탭 변환 단권변압기 시험 장비의 등가 모델을 기반으로 계통 연계 규정을 만족하기 위한 단권변압기의 임피던스를 설계한다. 제안하는 설계 방법을 이용하여 LVRT/HVRT 시험 시 요구되는 다양한 사고전압을 출력할 수 있는 시험장비의 설계를 위한 탭 간의 임피던스 설계 과정을 설명한다. 제안하는 설계 방법의 타당성을 검증하기 위하여,10MVA급 LVRT/HVRT 시험 장비의 설계 과정을 설명하고 시뮬레이션을 통하여 확인하였다.
Abstract
This paper proposes an impedance design method of the test device for evaluating Low Voltage Ride Through(LVRT)and High Voltage Ride Through(HVRT) functions. The LVRT/HVRT test device should have ability to generate thefault voltage specified in the grid code for a certain period and to limit the magnitude of the fault current with the designspecification. In this paper, the impedance design method for auto transformer is proposed based on a equivalent modelof a tap-change auto-transformer during LVRT/HVRT operation. In addition, to generate various fault voltages requiredthe LVRT/HVRT test, tap impedance design in the auto transformer is considered. To verify the validity of the proposeddesign method, the design process of the 10MVA LVRT/HVRT test device was conducted and the design results wasverified through simulation models.
참고문헌 (10)
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