Investigation of photovoltaic inverter loss of phase protection

目前，并网可再生分布式发电（DG）在渥太华发展迅速。为了促进分布式电源的集成，渥太华的本地配电公司渥太华水电有限公司（HOL）根据IEEE Std. 1547.第1547章特别的关心一个单独的失相（LOP）保护装置是这样一个额外的要求，DG制造商和业主经常抱怨，因为在加拿大没有其他公用事业有这个要求。这一要求增加了渥太华DG并网的DG业主、制造商生产测试、和效用调试测试的成本。iSolara太阳能有限公司（iSolara）目前正在开发高性能低成本并网光伏（PV）发电系统。通过这个NSERC Engage项目，iSolara和Carleton将调查逆变器DG并网时单独LOP保护装置的必要性。如果证明已经满足现行标准的逆变器不需要单独的LOP保护装置，则渥太华的光伏安装成本将降低。本项目的结果将有助于iSolara和HOL了解中间变压器和多逆变器配置对基于逆变器的DG LOP保护的影响。调查结果对于iSolara和HOL未来在DG集成技术和基础设施方面进行明智的，战略性的和有效的投资至关重要。从本质上讲，该项目将有利于公用事业公司，DG供应商和标准制定者以协调和积极的方式采取行动，以确保DG在加拿大的成功整合。

Nowadays, the grid-connected renewable distributed generation (DG) is fast growing in Ottawa. To promotethe integration of DG, Hydro Ottawa Limited (HOL), the local distribution company in the City of Ottawa,established numbers of criteria and requirements for DG connection according to the published standards suchas IEEE Std. 1547 and HOL's special concerns. A separate loss-of-phase (LOP) protection device is such anadditional requirement that DG manufacturers and owners often complain since no other utilities in Canadahave this requirement. This requirement increases the cost of DG owner, manufacturer production test, andutility commissioning test for DG integration in Ottawa. iSolara Solar Power Limited (iSolara) is currentlydeveloping high performance low-cost grid-connected photovoltaic (PV) generation systems. Through thisNSERC Engage project, iSolara and Carleton will investigate the necessity of a separate LOP protection devicefor grid-connection of inverter-based DG. The cost of PV installation in Ottawa will be reduced if the separateLOP protection device is proved to be unnecessary for the inverters which have already satisfied the currentpublished standards.The outcome of this project will help iSolara and HOL to understand the impact of intermediate transformerand multiple-inverter configuration on inverter-based DG LOP protection. The investigation results are criticalfor iSolara and HOL to make informed, strategic and effective investment in DG integration technology andinfrastructure in the future. Essentially, the project will be beneficial for utility companies, DG manufacturesand standard makers to act in a coordinated and proactive manner to ensure the successful integration of DG inCanada.