WINDFARM HARMONICS & CONNECTION COMPLIANCE

A new power quality requirement from EirGrid for the connection of wind farms to the transmission network saw us undertake a harmonic compliance study for a 58MW wind farm in Ireland’s midlands being brought on stream by one of the country’s leading renewable companies.

INDUSTRY SUCCESS

Renewable electricity accounts for

66

of renewable energy

Wind accounts for

85

of renewable electricity

By 2020

16

of energy consumption must be from renewables

THE CHALLENGE

The new Eirgrid requirements required a more in-depth harmonic analysis to take account of possible switching or grid configuration changes upstream and to help future proof wind farm connections as more renewables come on stream.  The combination of the high number of impedance values and the wind farm switching scenarios meant that a large amount of data had to be processed and analysed. Specialist software, programming and expertise was required to complete this.

HOW WE HELPED

We modelled the wind farm in detail to help inform the harmonic analysis. This involved implementing the transmission LOCI impedances using DIgSILENT /PowerFactory software and calculating the results. These results were assessed against the allocated voltage distortion limits provided by EirGrid. LOCI diagrams with colour coding, required to represent the voltage distortion at each possible system impedances, were also produced and provided to the client.

THE RESULT

We completed a comprehensive harmonic analysis of this wind farm, that ensured the client could meet its obligations under the new EirGrid requirements. The results identified a number of distortion breaches. We designed a suitable passive filter to eliminate those breaches and ensure full harmonic grid compliance. This allowed the customer to deliver a reliable and cost effective solution compatible with transmission operator guidelines.

THE CLIENT

This windfarm is located in Ireland’s midlands in Co. Roscommon. The project comprises 20 wind turbines, a substation and will have an export capacity of 58 MW, supplying the equivalent of 37,000 households.

"The analysis required to meet with EirGrid’s new power quality requirements is detailed and highly specialised. Premium Power have both the experience of delivering on power quality projects and the expertise with our highly skilled engineers. This was an interesting project to work on, taking in the number of scenarios that had to be calculated. In this case we were able to provide a solution and ensure the client did not face potential harmonic resonance issues further down the line."

George MoklElectrical Engineer

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