RESYNC_TO_GRID
Resynchronisation of an islanded microgrid to the utility with synchro-check windows, dwell and matching bias outputs.
When to use it
Use RESYNC_TO_GRID when an islanded microgrid has to be paralleled back onto the utility, and the close must be permitted only when voltage, slip and phase angle are all inside their windows with both sides live.
Interface
The published port signature. This is the whole of what the block exposes to your program — the implementation body is not shown here and ships with the download.
Inputs
| Port | Type | Unit |
|---|---|---|
| ENABLE | BOOL | — |
| START | BOOL | — |
| ABORT | BOOL | — |
| PCC_CLOSED | BOOL | — |
| MEAS_OK | BOOL | — |
| V_ISLAND_PU | REAL | pu |
| V_GRID_PU | REAL | pu |
| F_ISLAND_HZ | REAL | Hz |
| F_GRID_HZ | REAL | Hz |
| ANG_DEG | REAL | deg |
| DV_MAX | REAL | pu |
| SLIP_MAX | REAL | Hz |
| ANG_WIN | REAL | deg |
| V_LIVE_PU | REAL | pu |
| SLIP_BIAS_HZ | REAL | Hz |
| DWELL | TIME | — |
| SYNC_TMO | TIME | — |
| ACK | BOOL | — |
Outputs
| Port | Type | Unit |
|---|---|---|
| PERMIT | BOOL | — |
| CLOSE_CMD | BOOL | — |
| IN_SYNC | BOOL | — |
| BOTH_LIVE | BOOL | — |
| CLOSED_OK | BOOL | — |
| DV | REAL | pu |
| DF | REAL | Hz |
| DANG | REAL | deg |
| V_ADJ | REAL | pu |
| F_ADJ | REAL | Hz |
| VALID | BOOL | — |
| ALM_SYNC_TMO | BOOL | — |
| ALM_MEAS_FAULT | BOOL | — |
| ALM_CFG_ERR | BOOL | — |
| ALM_CFG_SUBST | BOOL | — |
IEC 61499 event interface
EI INIT, REQ·EO INITO, CNF
Supervised control write
RESYNC_TO_GRID commands a real actuator. It is written to sit underneath your own interlock, permissive and protection logic — not to replace it. Commission it as you would any control block you wrote yourself.
Validation evidence
- Tests
- 11
- Simulated scans
- 155
- Simulator
- v0.1.0
Complete IEC 61131-3 implementation with a published test suite that runs on the vplant simulator. The counts above are that suite, executed on this build.
- Conforms to IEC 61131-3
- Conforms to IEC 61499
Download RESYNC_TO_GRID — free
Create a free Ri Tech account to download the block. You get the Structured Text body, the Rockwell Add-On Instruction (.L5X), the Schneider Control Expert DFB (.XDB), PLCopen XML, the IEC 61499 function block type (.fbt) and the datasheet.
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