CAJ | 학술논문

介绍了分频输电系统(FFTS)应用于海上风电的拓扑结构,并通过一个装机容量300 MW、离岸距离250 km 的算例,比较其与现有高压交流(HVAC)和高压直流(HVDC)并网方式的技术及经济优劣。FFTS 通过降低输电频率(如50/3 Hz),显著降低交流电缆中的充电电流,提升海底交流输电的效率与性能。结果表明,FFTS 能满足算例的并网需求,且风电穿透率大于 HVAC。算例中 FFTS 换流站的投资折算和年维护费用比 HVDC 少9126万元,等年值比 HVDC 低7.28%。在算例的基础上,文中进一步给出了 FFTS-HVDC 临界经济距离—装机容量曲线,相对而言 FFTS 更适用于装机容量大、离岸近的风电场,对于300 MW 风电场,二者的临界经济距离约为634 km,远超已有和规划中的海上风电场的离岸距离。分析结果表明了分频海上风电系统所具有的应用潜力。
개소료분빈수전계통(FFTS)응용우해상풍전적탁복결구,병통과일개장궤용량300 MW、리안거리250 km 적산례,비교기여현유고압교류(HVAC)화고압직류(HVDC)병망방식적기술급경제우렬。FFTS 통과강저수전빈솔(여50/3 Hz),현저강저교류전람중적충전전류,제승해저교류수전적효솔여성능。결과표명,FFTS 능만족산례적병망수구,차풍전천투솔대우 HVAC。산례중 FFTS 환류참적투자절산화년유호비용비 HVDC 소9126만원,등년치비 HVDC 저7.28%。재산례적기출상,문중진일보급출료 FFTS-HVDC 림계경제거리—장궤용량곡선,상대이언 FFTS 경괄용우장궤용량대、리안근적풍전장,대우300 MW 풍전장,이자적림계경제거리약위634 km,원초이유화규화중적해상풍전장적리안거리。분석결과표명료분빈해상풍전계통소구유적응용잠력。
A novel approach to integrating offshore wind power via the fractional frequency transmission system (FFTS) is briefly treated.The basic idea of FFTS is to improve the technical and economic performance of AC transmission systems by lowering the grid frequency,e.g.50/3 Hz.FFTS is especially suitable for wind power transmission as the low frequency can significantly reduce the charging current.The basic structure and characteristics of a typical PMSG based FFTS offshore wind power system is described first.Then an example wind farm(300 MW,250 km)is used to compare the technical and economic pros and cons of the FFTS with the conventional approaches of HVAC and HVDC.The feasibility studies show that the performance of FFTS wind system is superior to that of HVAC and HVDC.The paper further analyzes the economical transmission distances for the above three integration approaches.The results demonstrate that the maximum transmission distance for HVAC is merely 80 km,and the critical transmission distance between FFTS and HVDC is 634 km.This result means FFTS suits most offshore wind farms,while HVDC is economical only for very long distance transmission.Therefore, FFTS is a very promising approach for offshore wind power integration.