G5 Harmonic Assessment
Low Carbon Technology Compliance and Assessment
Threepwood support a number of clients relating to LCT devices – such as heat pumps, electric vehicle chargers, inverter connected generators (PV, wind, battery). These projects relate to Standards compliance of LCT devices and their connection assessment to the public electricity distribution networks in UK and Ireland. The particular skills and competence we bring to these projects include:
- Compliance with ENA Engineering documents for power quality: EREC G5, EREC P28
- Compliance with ENA Engineering documents for generation: EREC G98, EREC G99
- Compliance with international standards for generators: EN 50549-1, EN 50549-10
- Compliance with EMC product Standards: BS EN IEC 61000-3-2, BS EN 61000-3-3, BS EN IEC 61000-3-11, BS EN 61000-3-12
- Modelling and assessing harmonic performance of LCT devices
- Modelling and assessing voltage fluctuation (e.g. flicker and step voltage change) performance of LCT devices
- Considering the assumptions in EREC G5 against ‘real’ harmonic data
Assessment Options
Stage 1 A/B Assessment
Suitable for smaller installations where a simplified assessment can be undertaken in accordance with ENA EREC G5/5.
The assessment typically includes:
- Review of equipment ratings and connection details
- Stage 1 screening calculations
- Assessment report
- Compliance conclusion and recommendations
This option is often suitable for smaller EV charging installations and other low-capacity power electronic connections.
Stage 2 C Assessment
Suitable for larger installations or projects that fail the initial Stage 1 assessment and require a detailed harmonic study.
The assessment typically includes:
- Detailed harmonic emission analysis
- Network fault level assessment
- Harmonic voltage calculations
- Compliance assessment against planning limits
- Comprehensive technical report
This option is often suitable for smaller EV charging installations and other low-capacity power electronic connections.
Information Required
To complete an assessment, we typically require:
- Single line diagram
- Equipment manufacturer and model details
- Harmonic emission data (where available)
- Connection voltage
- DNO fault level information (if available)
- Project location