Small wind / Buyer questions
Electrical configuration
Does zero export also protect a wind turbine from overspeed?
The short answer
Not by itself. Zero-export control normally concerns the power measured at a site connection. Turbine protection concerns the machine and its permitted operation. If export control tells a converter to accept less wind power, the turbine still needs its documented response to reduced electrical loading. A meter and an export setpoint do not establish that every surplus-energy or overspeed condition has been addressed.
Follow a sudden loss of site demand
Illustrative snapshot: wind generation and site demand are both 4 kW, so measured export is zero. A 3 kW load then stops. Unless the system responds, generation exceeds the remaining 1 kW demand by 3 kW. The energy balance has changed even though the export setting remains the same.
The design must identify how export is reduced and how the wind equipment handles the resulting restriction. Its actual response time and permissible transients need equipment-specific evidence.
Two functions to document separately
| Function | Evidence sought |
|---|---|
| Connection export control | Meter boundary, controlled sources and accepted response |
| Turbine loading/stopping | Behavior when the converter reduces or rejects power |
| Communication failure | Defined fallback for both responsibilities |
If solar or another generator shares the connection, the export controller also needs the correct aggregate picture.
Do not turn a label into a complete specification
“Zero export” can describe a target, a control feature or a tested project arrangement. Those meanings are not equivalent. Confirm what has actually been provided and how compliance is assessed by the relevant connection authority.
Ask for an operating description linking the site controller and the wind subsystem. MARSTON turbine braking, electrical loading and export management must be defined for the offered configuration rather than inferred from one feature name.
Keep the measurement point visible
A controller looking only at the wind branch sees a different quantity from a meter at the site connection. The branch reading excludes other generation and loads. A convincing export-control description therefore marks the meter location, the sources under control and the boundary against which any limit is assessed; a dashboard name alone is not enough.
Sources
Examples are illustrative. Confirm product-specific performance, compatibility and supply scope in the applicable documents.