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PMSG를 이용한 풍력발전 시스템의 3병렬 운전과 계통 연계 기술

Three-Parallel System Operation and Grid-Connection Technique for High-Power Wind Turbines using a PMSG

초록/요약

This paper proposes a design of the three-parallel converter system and grid-connection technique for wind turbine systems using a PMSG. The back-to-back converter of the wind turbine system is directly connected to the grid so that both the power devices and the filters are needed to have large power ratings. The three-parallel converter configuration and LCL-filter can reduce the required power ratings of the devices and filters. However, the three-parallel converter can cause circulating currents. These circulating currents can be suppressed by sellecting proper inner inductance at each leg. Second, grid connection techniques are proposed. The resonance caused by the LCL filter is compensated by an active damping method using power theory without additional power loss. The decline of the power quality caused by the unbalanced and distorted grid voltages is also compensated with an additional compensation algorithm. The simulation and experimental results show that the proposed system and compensation methods are effective for the wind turbine systems.

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목차

제 1 장 서론 1
제 2 장 시스템 설계와 계통연계 기술 5
2.1 3병렬 시스템 설계 5
2.1.1 3병렬 시스템을 위한 전류제어 5
2.1.2 내부 인덕턴스 설계 6
2.2 LCL필터 설계 7
2.3 전력 이론을 이용한 능동댐핑기법 11
2.3.1 전력 이론 11
2.3.2 공진보상 13
2.4 계통전압 불평형시 보상기법 14
2.4.1 불평형 전원의 해석 15
2.4.2 역상분 전압 보상을 위한 알고리즘 16
2.5 계통 전압 왜곡시 보상기법 17
2.6 전체 제어 블록도 20
제 3 장 시뮬레이션 21
제 4 장 실 험 29
제 5 장 결론 37
참고문헌 38

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