SHORT ABSTRACT AND KEYWORDS
This report summarises the state off the art on the interface and the interaction of a grid
connected PV-system and the utility power network. A total of 11 relevant topics are
described in this report. Summaries of these topics are given at the beginning of every
chapter.
Keywords: Harmonics, AC modules, multiple inverters and the AC grid, grounding of
equipment in PV systems, ground-fault detection, array disable, overvoltage protection,islanding, Electro magnetic compatibility (EMC), external disconnect, re-closing, isolation transformer and DC-injection
1. INTRODUCTION
Task V is a working group of the International Energy Agency (IEA), Implementing
Agreement on Photovoltaic Power Systems (PVPS). The title of the working group is “Grid
Interconnection of Building Integrated and Other Dispersed Photovoltaic Power Systems”
The main objective of Task V is to develop and verify technical requirements that may serve
as pre-normative technical guidelines for the network interconnection of building-integrated
and other dispersed Photovoltaic (PV) systems. The developments of these technical
guidelines aim at a safe, reliable and low cost interconnection of PV systems with the electric power network. Task V considers PV systems connected with the low-voltage network with a typical peak power rating between 100 Watt and 50 kiloWatt.
Task V has three subtasks:
10 Review of PV guidelines, grid structures and PV experiences
20 Theoretical studies on utility aspects of PV systems
30 Experimental tests using the Rokko Island and/or other test facilities
Subtask 10 defines the status quo of grid connected PV systems. A survey on present day guidelines gave information on the interconnection of PV systems with the utility network. A second survey showed the different network structures of the participation countries.
Subtask 10 identified present day and possible near future problems regarding the network
connection of PV systems. The scope of work of subtask 20 was to analyse these problems
and to draft possible recommendations for improvement. Some problems, however,
appeared to be too complex and additional experimental work had to be done. These
experiments are co-ordinated in subtask 30.
This report gives the results of the topics studied in subtask 20. All chapters have an
identical structure to allow for an easy access to the information given. Following sections
can be found in every chapter:
· Summary
· Introduction
· Scope of Work
· Theoretical results
· Experimental results
· Conclusions
· Recommendation for future work
Chapter 2 of this report describes the selection process of the study topics. The chapters 3 till 13 give the information and results of the selected study topics. Every chapter is written as a single entity and can be studied and interpreted without the need for consulting other chapters. The authors, however, advise the reader to study the whole report rather then a single chapter as many of the topics are directly or indirectly linked with another. Final conclusions and recommendations are given in chapter 14. The addresses of the authors are given in chapter 15. This report is intended for readers familiar with the technical concept of PV systems and/or readers with an electrotechnical background.
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