GridLinkPrivateWireEnergySolution
Generators earn more per unit than grid export pays. Consumers pay less per unit than the grid charges. GridLink is the engineering that makes the arrangement safe enough for a DNO to accept.
- Capacity
- Built to project rating
- Compliance
- G99, TUV Rheinland
- Modes
- Islanded or grid-parallel
- Enclosure
- IP54 · C3 · outdoor
The commercial case is easy. The connection is the hard part.
A private wire arrangement is straightforward on paper: a generator sells directly to a nearby consumer at a price above export and below import, and both sides win. What stops it happening is the network. Connecting generation to a private load without compromising protection coordination, power quality or network stability is a real engineering problem, and DNOs are right to be careful about it.
GridLink solves that problem with a power electronics converter at the point of connection. It regulates voltage, frequency and active power flow, delivers power in one direction only within the defined private network, prevents unintended export beyond the arrangement, and provides reactive power control to compensate for interconnection impedance.
It runs as an islanded supply, operating independently of the public grid, or as part of a dual connection running in parallel with an existing grid connection while maintaining defined and controlled power flow. The public network then provides load balancing without the private arrangement ever destabilizing it.
What GridLink does
Controlled power transfer
Manages active power transfer between generation and load, delivering part or all of the generator's output directly to site with defined, predictable flow.
Voltage & power quality control
Regulates voltage and power quality at the point of connection, keeping the private arrangement inside network and equipment standards.
Export prevention
Designed for one-directional delivery of active power, preventing unintended export beyond the private-wire arrangement.
Reactive compensation
Provides reactive power control to compensate for interconnection impedance across the private wire run.
Fault ride-through & FFCI
On the G99 variant, the converter's own output stage performs fault ride-through and fast fault current injection, removing dependency on the generator's own ride-through capability and the old disconnection interlock.
Frequency response modes
Limited frequency sensitive mode for both over-frequency (LFSM-O) and under-frequency (LFSM-U), alongside reactive power capability across the voltage range.
Factory-built skid
Each skid is factory-assembled and tested as a complete containerized unit before shipping, with outdoor-rated enclosures and solar canopy options for site power at deployment.
SCADA across both ends
Control architecture spans generation site and consumer site via a master controller, RTU and BCU measurement units on each MV skid, with interfaces agreed per project.
GridLink G99 variant specifications
Power conversion skid
- Capacity
- Built to project rating · 5 MVA reference build
- Architecture
- 33/0.69 kV rectification · DC link · 0.69/11 kV inversion
- PCS modules
- 4 per stage, across 2 DC-linked conversion stages
- Dimensions (W×H×D)
- 6058 × 2896 × 2438 mm
- Weight
- 24,300 kg
- Enclosure rating
- IP54
- Anti-corrosion grade
- C3
- Transformer cooling
- ONAN
- Certification
- G99, certified by TUV Rheinland
Battery enclosure
- Dimensions (W×H×D)
- 1300 × 2350 × 1350 mm
- Weight
- 3,700 kg
- Enclosure rating
- IP55
- Anti-corrosion grade
- C5M
- Design life / warranty
- 10-year design life, 2-year warranty
- Function
- DC link voltage support only. No DC, DM or DR frequency energy-storage services
G99 compliance
- Reactive power capability across voltage range
- Yes
- Voltage control and reactive power stability
- Yes
- Fault ride-through & fast fault current injection
- Yes, performed by the converter output stage
- LFSM-O (over-frequency)
- Yes
- LFSM-U (under-frequency)
- Yes
GridLink is built to the capacity each project requires. The figures below are for the 5 MVA configuration delivered as the certified G99 reference build; dimensions, weights and module counts scale with rating. DC link cabling by others. External communications architecture to be agreed per project. Figures are indicative and subject to change. Contact us for project-specific ratings and certified data.
Where this gets deployed.
- Solar farms selling directly to industrial consumers
- Water treatment works supplied from local generation
- Industrial parks and estate-wide private networks
- Data centers seeking generation adjacency
- Infrastructure operators with constrained grid connections
- Renewable projects with limited or expensive export capacity
Literature & datasheets
Download the current product literature, or browse the full library including legacy and discontinued systems.
Questions we get asked most.
- What is G99?
- Engineering Recommendation G99 is the UK grid code governing the connection of generating plant to distribution networks. It sets requirements for fault ride-through, fast fault current injection and frequency response so that embedded generation supports rather than destabilizes the wider network. That applies wherever a GridLink installation runs in parallel with the public grid.
- What changed in the G99 variant?
- The earlier converter iteration was based on modified industrial standard power electronics that could only transfer active power. Under that architecture the generator's own equipment had to satisfy fault ride-through and fast fault current injection, with an interlock preventing the converter from operating while the generator was disconnected from grid. Regulatory interpretation of G99 has since changed: the converter's output stage must now perform FRT and FFCI directly. The current variant does exactly that, at the same footprint and interfaces.
- Does the battery enclosure provide energy storage services?
- No. The DC link batteries provide DC link voltage support only, in the event of external system voltage collapse. They have no capability to provide energy storage services such as Dynamic Containment, Dynamic Moderated or Dynamic Regulation frequency support. If you need those, they are a separate BESS scope.
- Can it run without a grid connection at all?
- Yes. GridLink operates as an islanded supply, independent of the public grid, or as part of a dual connection running in parallel with an existing grid connection while maintaining controlled power flow. Dual connection is the more common arrangement because the public network then handles load balancing.
- What documentation is available for a DNO application?
- Type-test reports, G99 witness-test certificates and TUV Rheinland certification are available to support DNO connection applications and project due diligence. Voltage step, fault level and protection studies are carried out per project to confirm the point-of-connection design meets the local DNO's specific G99 requirements.
Usually specified alongside this.
Engineering Consultancy
Grid-code compliance, protection coordination and power system studies, modelled in DIgSILENT PowerFactory and signed off by chartered engineers.
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Renewable Energy & Drives
5325 S Moorland RdNew Berlin, WI 53151United States
Severn Drives & Energy
Units 2 & 3, Kingsley Business ParkNew Road, Kibworth BeauchampLeicestershire, LE8 0LEUnited Kingdom
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