American-Style Substation for Jimo Weiyu 200MW PV Plant

Overview:

Dual Constraints of Policy & Environment
Located in the Yellow River intertidal zone, the 200MW fishery-PV project faced dual binds:

Equipment footprint capped at 3% of water area (Qingdao Regulation HFG-2022-17), but 86 conventional substations would occupy 58 acres (172% over cap);

Salt fog deposition ≥12mg/m³ (Qingdao Ocean Monitoring Data), 2.4× higher than IEC 60721-3-4 Class CX, causing 63% failure rate within 5 years in Phase I;

Only 4-hour low-tide window daily for maintenance, with 2023 generation loss of 21GWh (12% of revenue) due to failures.

Technology Deadlock of Fishery-PV Synergy
The project demanded simultaneous stability for aquaculture and PV generation:

Oyster raft shading required substation height ≤2.8m (vs standard 3.5m), with foundation scour resistance <5cm;

Feeding vessel operation mandated ≥80m spacing, impossible for 1.2MW substations;

Inverter harmonics conducted through water caused mass oyster mortality (8,000 cages lost in 2023), requiring THDu reduction from 15% to <5%.

Product Value