Community Research and Development Information Service - CORDIS


UNIVERSOL Report Summary

Project ID: 11659
Funded under: FP5-EESD
Country: Spain

Report on PV system-grid interaction - Monitoring report

The main objective of this result 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. the task considers PV systems connected with the low-voltage network with a typical peak power rating between 100 Watt and 50kW.

The operational experience with PV systems itself is at an acceptable high level and today's installed PV systems are of a good quality and are able to operate without any problems for many years. The price level of the PV modules and the Balance of System costs (inverter included) have decreased significantly.

The use to PV systems connected in parallel with the utility electric power network has become very favourable and is often supported by incentives from utilities and/or governmental bodies.

Before connecting a PV system to the power network, the DC voltage of the solar modules must be converted into an AC voltage. Some protection systems are required preventing damages in the PV system caused by the utility network and vice versa. Other important aspects are the electrical installation procedures, electrical interference between network and one or more PV systems, EMC and harmonics. For some topics PV does put special constraints on the solution that are normally used by the utilities. Hence, international work is required on utility aspects of grid connected PV systems.

In this task we have collected several topics that need attention, all of them related to the electrical aspects of PV systems and power networks. The topics are ordered in the following categories:
- Harmonics.
- Multiple inverters in parallel mode.
- Grounding of equipment.
- Ground fault detector.
- Over-voltage protection.
- Islanding.
- EMI of inverter and Array.
- External disconnect.
- Re-closing.
- DC injection and isolation transformer.

Reported by

UNIVERSITAT DE BARCELONA Dep Física Aplicada i Òptica
PCB c/ Baldiri Reixac 4-6
08028 Barcelona
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