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MMC-HVDC 시스템을 위한 부하 전압변동에 강인한 H<SUB>∞</SUB> 제어기 설계
천관호(Kwan-Ho Chun),이성원(Sung-Won Lee) 제어로봇시스템학회 2018 제어·로봇·시스템학회 논문지 Vol.24 No.6
In this paper, load variations in an HVDC system which is connected to an AC grid are considered. As the demand for the introduction of renewable energy increases, stable connections with the conventional AC grid are an important issue. To secure stable connections, a converter system should operate robustly against system noise. Since power systems have much uncertainty and noise, a robust control technique is needed for the adoption of renewable energy sources. First, an MMC based converter system is modeled mathematically. Based on this mathematical model, a linearized model is obtained for the operating point in active and reactive power tracking modes. By using the dq0 coordinate system, a generalized plant is obtained, and a robust H∞ controller for the converter system is designed for voltage disturbances. The designed controller is validated by MATLAB simulation.
1톤급 수직이착륙 시연체 TVC 구동기의 제어기법 연구
윤호준(Ho-Jun Yoon),전유림(Yu-Lim Jeon),이종덕(Jong-Deok Lee),이범석(Beom-Seok Lee),지상연(Sang-Yeon Ji),천관호(Kwan-Ho Chun) 한국추진공학회 2023 한국추진공학회 학술대회논문집 Vol.2023 No.5
The vertical takeoff and landing demonstration body (VTVL) requires posture control of the thrust vector control (TVC) driver for navigation control. In this paper, a device for control/measurement was constructed to select a control technique for a thrust vector control driver of a vertical takeoff and landing demonstration body, and communication and analog control tests were performed through a driver and an IMU sensor, and data were compared. Finally, the analog type had a suitable result for controlling the TVC driver of the vertical takeoff and landing demonstration body when looking at the response characteristics and data results.
전류형 HVDC 성능 개선에 대한 연구 (STATCOM를 중점으로)
배영재 ( Young-jae Bae ),천관호 ( Kwan-ho Chun ) 사단법인 한국빅데이터서비스학회 2023 빅데이터서비스학회 논문집 Vol.1 No.2
우리나라 HVDC 시스템은 제주1호기, 2호기에 이어 제주와 육지간 HVDC와 북당진-고덕 HVDC, 동해안 HVDC를 계획하고 있다. 특히 북당진-고덕 HVDC 시스템은 Back to Back scheme 특성 가지며, 이벤트 발생 시 HVDC Run-up기능을 동작하면, 낮은 DC 전압으로 인해 DC 전력이 목표치에 상승하지 못하는 문제가 발생한다. 북당진-고덕 HVDC의 고덕 측의 TOV(Temporary Over Voltage)의 문제를 해결하기 위해 STATCOM을 설치하였다. 실시간 계통해석 시뮬레이터(RTDS)를 이용하여 전압원 모델을 HVDC 양 단에 설치하고 인버터단에 STATCOM을 투입하여 시뮬레이션 하였다. STATCOM의 AC전압을 유지시키려는 특성으로 인해 투입 전보다 DC 전력이 상승하지 못하는 결과를 보여, STATCOM의 Vset 전압을 높여, AC 전압, DC 전압 또한 상승시켜, DC 전력을 목표치까지 출력하는것을 확인하였다.향후에는 우리나라 전계통을 이용하여, 765kV 선로로 시뮬레이션하여 이벤트 발생 시 STATCOM 의 설정전압에 대해 정밀한 모의가 필요하고, 동해안 HVDC 구축 시 두 HVDC의 모의시뮬레이션이 필요하다. Following Jeju Units 1 and 2, Korea’s HVDC system is planning HVDC between Jeju and the mainland, HVDC between Bukdangjin and Godeok, and HVDC on the east coast. In particular, the Bukdangjin-Godeok HVDC system has a Back to Back scheme characteristic, and when the HVDC Run-up function is activated when an event occurs, a problem occurs in which DC power does not rise to the target value due to low DC voltage. STATCOM was installed to solve the TOV (Temporary Over Voltage) problem on the Godeok side of the Bukdangjin-Godeok HVDC. Using a real-time system analysis simulator (RTDS), a voltage source model was installed on both ends of the HVDC and STATCOM was input into the inverter for simulation. Due to the characteristic of STATCOM trying to maintain the AC voltage, the DC power did not increase compared to before input, so by increasing the Vset voltage of STATCOM, the AC voltage and DC voltage were also increased, and it was confirmed that the DC power was output up to the target value. In the future, Using Korea’s electric system, a 765kV line is simulated to accurately simulate the set voltage of STATCOM when an event occurs, and when constructing an East Coast HVDC, the correlation between two HVDCs is needed to be simulated.