Task 5, the IEA  PVPS working group responsible for grid-interconnection of building integrated and other dispersed PV power systems, has recently published a report on utility aspects of grid-connected PV power systems.

The study, which is intended for readers familiar with technical concepts of PV systems and/or those with an electrotechnical background, presents the results of Task 5's analysis of the current and near-future problems of network connection of PV systems. Recommended countermeasures to address the majority of these issues are also presented.

Chapters of the report deal with harmonics, AC modules, multiple inverters, grounding and ground fault protection, over-voltage protection, islanding, electromagnetic compatibility of inverters, external disconnects, reclosing, isolation transformers and DC injection. Each chapter can serve as a stand-alone reference, to the respective utility connection issue, but as a whole the publication provides an invaluable insight into network interconnection of PV systems.

In addition, the report presents a useful annex summarising the various national requirements related to installation of PV systems in each of the Task 5 participating countries (Australia, Austria, Germany, Italy, Japan, the Netherlands, Switzerland, the UK and the USA). This covers grounding requirements, cabling and PV array wiring protocol, the use of batteries, and stand-alone inverters as well as utility interactive inverters. Disconnection requirements, thresholds and protective devices, and relevant standards are also described.

Information
For further details, or to request copies of this report IEA  PVPS T5-01:1998, contact your Task 5 representative.

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