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Flywheel energy storage medium voltage UPS system
This solution is an advanced dynamic uninterruptible power supply system integrating solid-state transformers and flywheel energy storage technology, specifically designed for critical loads such as data centers and precision machining. The system's rated power ranges from 1MW to 20MW, with a voltage level of 10kV. In the event of voltage sags or interruptions in the mains power, the system enables seamless switching, providing full-load backup power independently from flywheel energy storage, and smoothly coordinating with backup power systems for relayed power supply. Simultaneously, this solution integrates comprehensive power quality management functions, fundamentally eliminating power quality issues from the grid and providing highly reliable power support for critical facilities. This product deeply integrates various functions including uninterruptible power supply (UPS), dynamic voltage restoration (DVR), and power conversion system (PCS), enabling uninterrupted backup power and combined power supply, and includes active power filter (APF) and static var generator (SVG) capabilities to effectively ensure grid power quality. Compared to traditional UPS solutions, this system offers significant advantages: system operational efficiency reaches up to 99%, resulting in substantial annual electricity cost savings compared to the typical operational efficiency of traditional online UPS (96%); when dealing with impactive, fluctuating, and harmonic loads common in industrial sites, AIDC, and large power supply sites, the required configuration capacity factor is lower than that of traditional online UPS in these scenarios, offering better investment value; the equipment reliability is outstanding, with a system lifespan of up to 20 years and easy maintenance. Overall, this system sets a new industry benchmark in efficiency, load adaptability, lifespan, and total life cycle cost.
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High reliability
- Strong load matching capability, suitable for complex working conditions such as industrial sites
- Exceptional fault clearing and overload capacity, compatible with impact loads and harmonic loads
- Utility mode: 400% rated current for 2s, 120% for 10min
- Advanced mode: 150% rated current for 25s, 125% for 25s
- Wider output power factor range: inductive 0.1 to capacitive 0.7, suitable for complex loads such as inductive, resistive, capacitive, etc.
- Supports four-quadrant operation capability, suitable for energy feedback loads such as elevators, hoists, and winches
- The unique system topology ensures that the load is 100% placed within a high-reliability power supply system.
- SST adopts a modular design with no single point of failure, featuring one module redundancy per cabinet per phase
- Flywheel energy storage cabinet adopts modular design with no single point of failure design
- System power transfer multiple redundancy, fan redundancy
High efficiency
- Average overall machine working efficiency up to 99%
- 10kV medium voltage system with lower losses
- Unique topology power conversion core, utility mode efficiency greater than 99%
- The SST converter efficiency reaches up to 98%, further reducing energy consumption during cabinet charging/discharging and on the power side.
High performance
- SST four-quadrant operation enables fast reverse working switching time ≤5ms, ensuring uninterrupted power supply for critical loads
- Output voltage stability ±1%, output distortion THDU<2%, input power factor ≥0.98, excellent power quality
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One machine multiple functions, functional coverage:
- APF/SVG provides active power while providing harmonic treatment and reactive power treatment
- UPS/PCS provides backup power while allowing any proportion utility/storage combined power supply
- DVR/UPS voltage sag/short-term interruption treatment
High scalability
- 1~2MW system internal capacity expansion
- 2~20MW system parallel capacity expansion
- Can flexibly and elastically expand with increasing customer load
High availability
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Longer mean time between failures, MTBF ≥ 150,000 hours
- System can be redundantly designed, with no single point of failure design
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Lower mean time to repair, MTTR ≤ 10 minutes
- Consumable and vulnerable parts such as fans and dust filters support online replacement
- Aircraft cabinets can be redundant and support online maintenance
- SST cabinets can be redundant and support online maintenance
- SST module redundancy, with 1 redundant module per phase, automatically bypassing faulty modules for long-term operation until the next maintenance cycle
- Medium-voltage switches, reactors, and valve groups require no maintenance
- System availability up to 99.9999%
- Medium-voltage centralized installation, small size and flexible deployment
Comparative analysis with traditional low-voltage online UPS
|
Comparison item comparison item Comparison item |
Traditional low-voltage online UPS |
Flywheel energy storage Medium-voltage high-efficiency UPS |
|
|
Function |
Function coverage Coverage energy storage medium |
UPS work energy chemical battery |
one machine, multiple functions DVR/UPS/PCS+APF/SVG Flywheel energy storage |
|
capacity coverage and scalability |
0.5~2MW |
1 ~20MW |
|
|
deployment method |
trans former backend, distributed installation may occupy load-side equipment space |
centralized installation at medium voltage end, does not change distribution structure does not occupy load-side equipment space |
|
|
operation efficiency |
single machine end-to-end efficien cy |
96% |
99% |
|
system efficiency cy |
94% |
98% |
|
|
reliability |
service life life |
8~ 10 years |
20 years |
|
load matching degree |
stable load, inductive 0.6~ capacitive 0.9 industrial occasion or comprehensive load matching 2~3 times capacity UPS |
Shock wave dynamic load, regenerative load, inductive 0.1~ capacitive 0.7 industrial occasion or comprehensive load matching 1~1.5 times capacity UPS |
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Overload capacity |
Online mode 120% 10s , Bypass mode 360% 2s |
Regulation mode 400% 2s , independent mode 150% 2s Regulation mode 120% 10min , independent mode 125% 25s |
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Product standard:
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GB T 7260.3-2023 |
|
IEC62040 |
Safety standard:
|
|
IEC62477 |
Electrical schematic
Working status
Typical configuration 10kV 2MW 25S flywheel
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