Journal of the Korea Academia-Industrial cooperation Society (한국산학기술학회논문지)

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Control of 30kW Grid-Connected PCS for Wave Power Generation

파력발전용 30kW 계통연계형 PCS 제어

  • Kim, Wan-Seok (Department of Electrical Engineering, Wonkwang University) ;
  • Kim, Jae-Hyuck (Department of Electrical Engineering, Wonkwang University)
  • 김완석 (원광대학교 전기공학과) ;
  • 김재혁 (원광대학교 전기공학과)
  • Received : 2018.12.26
  • Accepted : 2019.03.08
  • Published : 2019.03.31
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Abstract

This paper deals with a 30kW grid-connected PCS (Power Conversion System) for an Oscillating Water Column (OWC) wave-power generation system. Wave power generation in marine energy is suitable for Korea with the characteristics of a peninsula with three sides facing the sea. In the case of coastal disasters, wave generators can act as a breakwater to reduce damage, and can be integrated with other marine power generation systems to increase efficiency. Wave power generation systems are classified into various types, such as oscillating bodies, OWC, and overtopping according to the operation principle, and they can also be classified into two types according to the installation method: a fixed structure and floating structure. This paper proposes a 30kW grid-connected PCS topology and model for OWC wave power generation that is structurally stable with a turbine and generator that are relatively easy to maintain, and then provide a control method required for grid connection, including DC link voltage control. Simulation verification was performed to verify the proposed PCS.

본 논문에서는 진동수주형(OWC: Oscillating Water Column) 파력발전시스템을 위한 30kW 급 계통연계형 PCS(Power Conversion System)을 다룬다. 해양에너지 중 파력 발전은 삼면이 바다인 반도의 특성을 지닌 한국에 적용하기 적합하고 연안재해 시 파력 발전기가 방파제 역할을 하여 피해를 감소시킬 수 있고, 다른 해상 발전과 개발 대상 적지가 일치하므로 통합하여 효율을 증대 시킬 수 있다. 파력발전 방식은 작동 원리에 따라 가동 물체형과 진동수주형, 월파형 등 여러 형태로 구분하며, 설치 형태에 따라 고정식과 부유식으로 구분된다. 본 논문에서는 구조적으로 안정되고 터빈과 발전기의 유지 보수가 비교적 쉬운 진동수주형을 채택하여, 파력발전용 30kW 계통연계형 PCS 토폴로지 및 모델을 제안하고 계통에 안정적으로 전압을 공급할 수 있는 DC link 전압 제어 등 계통연계 시 필요한 제어방법에 대해 설명하였다. 또한 이를 검증하기 위해 시뮬레이션을 수행하였다.

Keywords

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Fig. 1. Oscillating water column model

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Fig. 2. Diagram of grid-connected wave power generation system

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Fig. 3. 3-phase generator and rectifier control model

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Fig. 4. Three phase PLL structure

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Fig. 5. Inverter output voltage expressed as a space vector

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Fig. 6. The effective time of each phase pole voltage

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Fig. 7. Grid-connected inverter control model

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Fig. 8. Generator output power(Top), Generator speed control(Bottom)

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Fig. 9. Generator output voltage(Top), Generator output current(Bottom)

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Fig. 10. Generator output voltage zoom in(Top), Generator output current zoom in(Bottom)

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Fig. 11. Inverter output voltage(Top), Inverter output current(Bottom)

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Fig. 12. Inverter output voltage zoom in(Top), Inverter output current zoom in(Bottom)

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Fig. 13. Grid side DC link voltage control(Top), Inverter output power(Bottom)

Table 1. System parameter

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References

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