Apr 2015
Electricity Transmission
DNO Investigation into Voltage Interaction and Dependency Expectation (DIVIDE)
Apr 2015
Jun 2018
National Grid Electricity System Operator and National Grid Electricity Transmission
Ben Marshall
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Network Innovation Allowance
The intent of the project (DIVIDE):-

  1. Across FY 2015/2016 conduct (with participating DNOs) a set of trials which repeat the project Juniper voltage reduction trial in particular DNO areas at particular times of day in the daily load cycle, against differing expectations of embedded generation. Before the trial the consultant would be involved in modelling the DNOs network and the various load responses within it, combining that with anticipated embedded generator response and from this provide estimates of the level of active power reduction for the voltage reduction applied at the interface ahead of the trial. In each DNO area, a minimum of two trials, for high and low expected embedded generation levels shall be conducted against high and low overall anticipated demand levels for that DNO.

  2. The consultant with NGET will standardise the process by which the trials would be executed, liaising with the DNO such that it is possible to clearly model the anticipated outcome of trial. Monitoring requirements both at the interface and within the DNO system would be identified and delivered by NGET within the DNO system. The intent would be to utilise existing portable monitors for this purpose, rather than to purchase additional monitoring.

  3. On completion of the trial those findings then made available would be with the estimates above in the consultants simulation and any effects of significant embedded generation or other forms of voltage control (e.g. power factor correction) identified.

  4. From the comparison of each trial event, the intention would be to improve the accuracy and understanding of the next one.

  5. At the end of FY 2015/2016; the final aspect of work would be, having modelled what we can expect today from demand control- work out what changes to control systems across users, DNOs and embedded generators might improve future voltage response and consider the areas of enabling that achieve that, with the intent being to construct the business case for the DNO going forward to implement with its future users these changes.

Based on these assessments, in conclusion the consultant would across the FES (Future Energy Scenarios) scenarios, and with consideration to future specification and technology, forecast how our voltage control might evolve over the next ten year horizon.

  • Via further trials, improve modelling and understanding of the voltage dependant behaviour of load during periods of emergency voltage reduction
  • Use this understanding to propose alternative control and design options for future connections
  • Consider future challenges associated with new types of load/ generation connection and propose any alternative control strategies particular to these cases.

Use the improved modelling to further inform voltage dependent modelling and forecasting in representing the future range of control actions available.

  • To have WP1-3 completed in order to conduct trials across 2015/16 encompassing winter peak and summer minimum load conditions at high and low EG penetrations.

  • To conclude upon alternative control approaches and confirm their technical viability in principle