Menu
For all embedded generators connected to the DNO networks it is necessary to meet the requirements of the ENA G99 standard. This standard details various performance requirements for generators depending on their rating (in MW) and connection voltage. These studies are, split into four main categories, as shown below.
Type B studies are quick and easy to do and can be done in under a week – assuming all the information is readily available and an engineer is free. Type C/D studies are practically identical, but are a little harder to complete as they require more extensive dynamic modelling of the inverter and the PPC. The key to all the studies and simplifying the approval process, is starting early and good data handover.
Full Grid Compliance in the UK is required for any embedded generators >50MW in England & Wales, >30MW in South Scotland (SPT area) and >10MW in North Scotland (SSE area). Grid Code compliance for NESO is hard the amount of studies and paperwork required is an order of magnitude more difficult than the ENA G99 process, and should not be entered into with being clear on the requirements.
The general framework of studies is similar to the ENA process, but has a large amount of additional requirements. These include:
The review process from NESO is much more challenging and time consuming, expect at least 6-9 months to complete the studies compliance process – if everything goes well! The need for unencrypted RMS models, and accurate EMT models is a frequent cause of delays. Also the need for SSO studies, is becoming increasingly required in the Schedule F of projects, which can add significant cost and delays. The earlier the compliance process is started the better.
Contact: Jesus Albornoz
Phone: 01305 300 210
Aurora Power Consulting are a leading independent power systems consultancy. We provide specialist power systems analysis services using software such as DIgSILENT, ETAP, PSCAD, EMTP-ATP, CDEGS and XGSLab.
