Solar Power Plant: 300MW / 1200MWh Grid-Forming Energy Storage Project

 

1. Project Overview

System Composition:

  • 120 sub-arrays (2.5MW / 10MWh each)

  • Each sub-array includes:

    • 1 × 10MWh battery cabin

    • 1 × 2.5MW PCS-booster unit

  • Each booster unit: 4 × 1250kW converters (operated at 625kW each)

Performance Highlights:

  • 300% overload for 10 seconds (up to 900MW output)

  • Monthly energy delivery: ~30 million kWh


Solar-power-plant
Solar Power Plant



2. Solution Design

  • Unit Design: 2.5MW PCS-booster + 2 × 5MWh liquid-cooled battery cabins

  • Feeder Lines: 25MW / 100MWh per line × 12 lines

  • Grid Connection: 220kV booster station linked to Auytak 220kV substation

  • Operation: Stable at 110% rated current for continuous operation

Core Functions:

  • Grid Support: Peak shaving, renewable smoothing, curtailment reduction

  • Voltage Stabilization: Rapid response to grid disturbances and overvoltage

  • Frequency Regulation: Active power sharing to slow frequency deviations

  • Grid Strengthening: Improves short-circuit ratio, enabling higher renewable penetration

  • Oscillation Suppression: Mitigates wideband oscillation risks

1200MWh Grid-Forming Energy Storage Project
1200MWh Grid-Forming Energy Storage Project



3. Key Features & Innovations

  • China’s First large-scale grid-forming storage deployment

  • Black Start: Restores local power supply after grid outages

  • Virtual Inertia: Emulates synchronous generators for system stability

  • Overload Performance:

    • 300% rated current for 10s

    • 110% rated current continuous

    • 120% rated current ≥2 minutes

Technical Innovations:

  • Adjustable inertia constant (≥20s)

  • Primary frequency regulation (<0.2s response, ±2% deviation)

  • Fast voltage regulation (<100ms response)

  • AGC (Automatic Generation Control) & AVC (Automatic Voltage Control) support

  • Low-frequency oscillation suppression (0.2–2.5Hz)

  • Black-start capability with ≤5% current deviation

  • Stable operation under ±2Hz frequency variations

  • Real-time coordination with dispatching authorities


300MW-bess-Standalone-Grid-Forming
300MW-bess-Standalone-Grid-Forming 


4. Results & Benefits

  • Constructed a 300MW / 1200MWh grid-forming energy storage station

  • Built a new 220kV booster station connected to the Auytak substation

Applications:

  • Renewable energy integration

  • Grid dispatch flexibility

  • Peak shaving & frequency regulation

  • Relieving industrial energy demand pressures

5. Economic Benefits & Prospects

Revenue Streams:

  • Renewable energy integration

  • Power trading (mid-/long-term contracts & spot market)

  • Capacity compensation

  • Ancillary services

  • Capacity leasing

  • Peak-valley arbitrage (peak shaving / valley filling)

6. Project Team

Lead Developer: Sano Energy

Expertise:

  • EPC (Engineering, Procurement & Construction)

  • Grid-forming and electrochemical storage solutions

  • Transmission and distribution of renewables

  • Large-scale PV + storage operation and maintenance

Team Composition:

  • Senior engineers

  • Experienced project managers

  • Specialists in grid stability and advanced storage systems


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