300MW/1200MWh Standalone Grid-Forming Energy Storage Project

1. Project Overview

• Location: Akto County, Kizilsu Kirghiz Autonomous Prefecture, Xinjiang

• Scale: 300MW / 1200MWh standalone grid-forming storage

• Technology: Lithium Iron Phosphate (LFP) batteries, 4-hour discharge

• Composition:

  • 120 sub-arrays (2.5MW/10MWh each)

  • Each sub-array = 1×10MWh battery cabin + 1×2.5MW PCS-booster unit

  • Each booster unit = 4×1250kW converters (derated to 625kW)

• Capability:

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

  • Monthly supply: ~30 million kWh

2. Solution Design

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

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

• Grid Connection: 220kV booster station → Auytak 220kV substation

• Operation: Supports continuous running at 110% rated current

Main Functions:

1. Grid Support – Peak shaving, smoothing renewables, reducing curtailment

2. Voltage Stabilization – Rapid response to overvoltage and grid disturbances

3. Frequency Regulation – Shares unbalanced power, slows frequency deviation

4. Grid Strengthening – Improves short-circuit ratio, supports renewable integration

5. Oscillation Suppression – Reduces wideband oscillation risks

3. Key Features & Innovations

• First use of large-scale grid-forming storage in China

• Black Start – Restores power after outages, supports local loads

• Virtual Inertia – Emulates synchronous generators, stabilizes frequency and voltage

• Overload Capacity – 300% rated current for 10s, 110% long-term operation

Innovations:

1. Provides inertia & short-circuit capacity

2. Adjustable inertia constant (≥20s)

3. Continuous operation:

   • 110% rated current (long-term)

   • 120% rated current (≥2 minutes)

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

5. Fast voltage regulation (<100ms response)

6. Supports AGC & AVC commands

7. Suppresses low-frequency oscillations (0.2–2.5Hz)

8. Black-start with ≤5% current deviation

9. Withstands ±2Hz frequency variation

10. Grid parameters coordinated with dispatching authorities

4. Results & Benefits

• Built 300MW/1200MWh grid-forming storage station

• New 220kV booster station, connected to Auytak substation

• Applications:

  • Renewable energy integration

  • Grid dispatch support

  • Peak shaving & frequency regulation

  • Reducing industrial energy pressure

5. Economic Benefits & Prospects

• Revenue sources:

  • Renewable integration

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

  • Capacity compensation

  • Ancillary services

  • Capacity leasing

  • Peak shaving / valley filling

6. Project Team

• Led by Sano Energy

• Team includes:

  • Senior engineers

  • Experienced project managers

• Expertise in:

  • EPC (Engineering, Procurement, Construction)

  • Grid-forming & electrochemical storage technologies

  • Renewable transmission & distribution

  • Large-scale PV and storage base operation & maintenance