500 kW Biomass Power: Rotating Genset + Step-up Transformer + House Load Deep-Read
500 kW synchronous genset (1000 kVA frame) · S13-M-500/10 step-up · 80 kW house load · grid-tied
1 · TL;DR Conclusion
Conclusion: this 500 kW biomass plant uses a 500 kW synchronous rotating genset (1000 kVA frame, prime duty) + S13-M-500/10 step-up transformer (0.4/10 kV) + 80 kW house load + 10 kV grid-tie — configurator total ≈ $170,226. The genset carries 100% of the 400 kW site load; the single step-up transformer has no N-1 (single-unit station) (feasibility-level).
- •500 kW synchronous genset (1000 kVA frame, prime) carries 100% of the 400 kW site load at 63%
- •S13-M-500/10 step-up transformer (500 kVA oil) 0.4/10 kV at 84% loading
- •80 kW house load (fuel feed, ID/FD fans, feedwater, cooling); single transformer, no N-1
- •10 kV grid-tie, 500 kW backup (V9 pass), grid-sync protection
- •78,702 kWh/yr losses ($11,640); SH15 upgrade saves $284/yr, 3.4-yr payback
2 · Solution Overview
A biomass station is the classic rotating-genset + step-up-transformer + house-load architecture: the synchronous generator generates onto the 0.4 kV bus, house load taps the bus directly, and the surplus is exported through the step-up transformer to the 10 kV grid. Reliability hinges on grid synchronization and house-load self-sustainment.
| Source | Role | Share kW | Share |
|---|---|---|---|
| Grid 10 kV | base | 0 kW | 0% |
| Diesel 500 kW | base | 400 kW | 100% |
3 · Design Process & Rationale
1. Requirement identification
A 500 kW biomass station = rotating synchronous generator + house load (fuel feed, ID/FD fans, feedwater, cooling ≈ 80 kW). Core needs: stable grid connection + house-load self-sustainment.
2. Source architecture
The genset is the base source (prime duty) carrying 100% of site load; the 10 kV grid is the tie/backup (shareKw=0). The synchronous machine generates onto the 0.4 kV bus.
3. Step-up transformer sizing
400 kW ÷ 0.8 PF ≈ 500 kVA → S13-M-500/10 oil step-up (0.4/10 kV), 84% loading in the economical band.
4. House-load bus
0.4 kV bus (GCK-1000) feeds the 80 kW house load + genset output directly, 8 feeders, largest motor 55 kW soft-start.
5. Grid tie & protection
Synchronizing + anti-islanding/reverse-power protection to separate the genset on grid faults; single step-up transformer has no N-1 (single-unit station), 500 kW backup covers house load.
6. Secondary & monitoring
61850 comms + SCADA monitor genset grid status, house-load power quality and step-up temperature for stable operation.
Pain Points → Solution → Evidence
Generator sync failure / loss of step hammers the set
Synchronizer + reverse-power/out-of-step protection + 61850 fast comms
grid-tied mode, genset base carries 100% load, selectivity 6.8× satisfied (V3)
House-load outage risks boiler/feed shutdown
0.4 kV bus taps house load directly + 500 kW backup
V9: backup 500 kW ≥ grade-1 + fire load — pass
Single step-up transformer means any fault kills the plant
State the single-unit boundary + backup + spare fast repair
N-1 = single (no N-1), gap 400 kW — must be covered by backup/spare
Harmonics and VAR exceed limits, failing grid compliance
Detuned reactors + capacitor compensation; APF if needed
V6 flags THDi over the limit (renewable-hybrid scene) — APF/SVG recommended
4 · Key Parameter Deep-Read
| Parameter | Value | Basis | Impact & Boundary |
|---|---|---|---|
| Genset | 500 kW synchronous (1000 kVA frame) | 500 kW biomass prime mover → synchronous generator, prime duty | 63% load on a 1000 kVA frame reserves expansion and transient margin 625 kVA real need at 0.8 PF; frame reserve helps black-start/impact |
| Step-up transformer | S13-M-500/10 (500 kVA) | 400 kW ÷ 0.8 PF ≈ 500 kVA | 0.4/10 kV step-up grid-tie at 84% loading Single unit, no N-1; expansion needs 630/800 kVA |
| House load | 80 kW | Fuel feed, ID/FD fans, feedwater, cooling auxiliaries | Tapped directly from the 0.4 kV bus for self-sustainment Largest motor 55 kW soft-start, 1.74% drop (pass) |
| Grid tie | 10 kV grid-tied | Surplus exported via step-up transformer to 10 kV | Genset base carries 100% of site load Needs synchronizer + anti-islanding/reverse-power + grid approval |
| Backup | 500 kW (V9 pass) | Grid/backup covers house load | House load stays up during genset service or fault Needs ATS auto-transfer (ATS-630 included) |
| Annual losses | 78,702 kWh ($11,640) | 84% loading + line loss | SH15 amorphous upgrade saves $284/yr 3.4-yr payback (V25) |
5 · Drawing Deep-Read
The following drawings are shown for reference (full set in the configurator “View design document”):
6 · Operation Demo (Deep-Read)
Energy flow
Synchronous genset → 0.4 kV bus (400 kW load, 100% genset-fed) → 80 kW house load + step-up export; system loss 8.98 kW (2.25%), line 4.96 kW + transformer 4.02 kW.
Grid tie & protection
Rehearses genset synchronization, reverse-power/out-of-step separation on grid faults, and house-load coverage by backup — the grid-tie and self-sustainment chains in full.
Reliability
Single step-up transformer has no N-1 (gap 400 kW on loss); the 500 kW backup via ATS covers house load — the key single-unit-station reliability criterion.
Loss & cost
78,702 kWh/yr ($11,640); SH15 amorphous upgrade saves $284/yr with 3.4-yr payback (V25).
Other views (shown): LCC (life-cycle cost) · Power quality & harmonics · Voltage profile · Scheme features
7 · Economics & Payback
Equipment total ≈ $170,226: genset $80,500, step-up transformer $8,604, fuel system $6,210, EMS $4,025, ATS $3,335. No PV/BESS so no generation payback model; economics rest on operation: $11,640/yr losses, SH15 upgrade saves $284/yr with 3.4-yr payback, and the ~9000 L / 72 h fuel reserve is the continuous-run cashflow item.
8 · FAQ
What generator size for a 500 kW biomass plant?
How big is the step-up transformer?
How much house load, and how is it fed?
How is it grid-tied?
Does house load drop when the genset faults?
Only one step-up transformer — what if it fails?
How much does the scheme cost?
Are operating losses high?
Do I need harmonic treatment?
Special Considerations
- The configurator models the biomass synchronous generator as a prime-duty rotating genset (1000 kVA frame, 625 kVA real at 0.8 PF) — the biomass prime-mover governor and excitation must be coordinated with the generator OEM.
- The step-up transformer is single (no N-1); a fault drops the plant (gap 400 kW). Add backup (500 kW here) or a spare transformer to cut repair downtime.
- V6 flags THDi over the limit (renewable-hybrid scene default); with few VFD/soft-start auxiliaries this is usually mild — add detuned reactors, and an APF if needed.
- Grid tie needs grid approval + synchronizer + anti-islanding/reverse-power protection; LV fault 17.6 kA → 25 kA breaking.
- Feasibility-level estimate; drawings pending a licensed design institute; fuel system estimated for 72 h autonomy (~9000 L).
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