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Technology / Engineering guide
Anti-Islanding & Intentional Isolated Wind Operation
Anti-islanding and isolated supply describe different engineering purposes. Preventing unintended energisation after a network separation does not establish the ability to power an isolated load. Define which state is required and which equipment is responsible for it.
Separate a protection purpose from a supply capability.
An intentional island needs a defined boundary and service assessment; it is not inferred from an anti-islanding label.
01 / Unintended island
Describe the condition the protection assessment addresses.
An unintended island can arise when a portion of a network is separated from its normal supply while local generation remains connected to that portion.
An unintended island can arise when a portion of a network is separated from its normal supply while local generation remains connected to that portion. The relevant protection assessment concerns how the selected arrangement addresses that condition.
DOE’s microgrid overview distinguishes islanding and intentionally separated systems. Its discussion provides general context, not evidence that a MARSTON converter includes anti-islanding functions or satisfies a particular connection rule.
02 / Intentional supply
Keep controlled isolation as a separate service.
An intentionally isolated system has defined sources, loads and operating responsibilities.
An intentionally isolated system has defined sources, loads and operating responsibilities. Providing its electrical reference and meeting its demand are additional requirements; preventing an unintended island does not establish either capability.
The converter-role guide distinguishes following and establishing a reference. Even a grid-forming description leaves energy availability, output limits and system coordination to be assessed for the actual proposal.
03 / Boundary map
Identify what remains inside the isolated network.
Retain the proposed network boundary and the sources and loads on each side.
Retain the proposed network boundary and the sources and loads on each side. Equipment roles can depend on that boundary. A diagram for one feeder does not automatically describe the separation of the complete site.
Record the devices responsible for separation and protection assessment without prescribing their settings or operation. A meter boundary used for export accounting is also not automatically the boundary of an intentional island.
04 / State matrix
Assess normal states and required changes separately.
List grid-connected operation, the relevant loss-of-reference condition and any requested isolated operation as distinct states.
List grid-connected operation, the relevant loss-of-reference condition and any requested isolated operation as distinct states. Record the selected equipment and available sources for each. Keep unsupported or unresolved states visible.
A state list does not provide evidence of a transition between states. Recovery, reconnection and black start are separate requirements where requested. This guide does not define a switching sequence or a procedure for intentionally creating an island.
05 / Evidence scope
Match a function claim to the actual configuration.
For a claimed anti-islanding function, retain the converter identity, relevant configuration, applicable requirement and supporting assessment.
For a claimed anti-islanding function, retain the converter identity, relevant configuration, applicable requirement and supporting assessment. A generic product-family reference may not establish what the quoted variant implements.
A test label must also match the technology and intended use. Do not borrow a photovoltaic-inverter procedure and declare a wind package compliant. The report guide helps preserve those boundaries.
06 / Project decision
Keep approval and supply promises distinct.
Connection requirements come from the actual operator and project assessment.
Connection requirements come from the actual operator and project assessment. Isolated-load service requires its own defined demand, reference and available source envelope. One document should not be used to imply approval of both subjects without scope evidence.
Bring the operating-state requirements and diagram to the electrical-package review. No MARSTON anti-islanding, black-start or off-grid supply capability is established by this explanatory page, and no protection thresholds or live tests are prescribed.
Continue the review with Wind Converter DC Bus Voltage & Energy Balance.
Continue the review with Wind Power Load-Step Response: Evidence Review.
Continue the review with Wind Turbine Technical Tenders: Requirement Response Matrix.
General background: DOE: islanding and intentional microgrid context. These references explain industry concepts; they are separate from the applicable MARSTON product and project documents.
Prepare the information for this review.
Use the checklist to organise the project information. Mark unavailable items and retain document references.
| Review item | Information to provide | Purpose |
|---|---|---|
| Operating purpose | Unintended-island prevention or intentional supply | Separate protection and service. |
| Network boundary | Separation point, included sources and loads | Define the assessed arrangement. |
| Assigned roles | Reference, separation and protection responsibilities | Expose coordination requirements. |
| State evidence | Supported states, transitions and configuration scope | Avoid inferred capabilities. |
| Applicable requirement | Operator input and actual report identity | Keep approval traceable. |
Engineering questions.
Does anti-islanding mean an inverter can supply off-grid loads?
No. Prevention of an unintended island and isolated-supply capability are different functions.
Does grid-forming alone guarantee intentional-island service?
No. Energy, load envelope and complete-system coordination still need assessment.
Is a site export boundary always the island boundary?
No. They describe different purposes and may be located differently.
Does a state list prove transitions are supported?
No. Transition behaviour requires its own applicable evidence.
Does the guide confirm MARSTON anti-islanding?
No. The selected converter and actual requirement must be documented.
Are protection settings or islanding tests provided?
No. This page defines review scope without operating or testing procedures.
Technical enquiry
Bring your project information to the discussion.
Anti-islanding and isolated supply describe different engineering purposes. Share the available information and the equipment scope you want reviewed in a technical quotation.