一、 Project Background
With the rapid development of modern medical technology, hospitals have increasingly high requirements for the continuity, stability, and quality of power supply. Medical equipment such as operating rooms, ICUs, imaging diagnostic systems, etc. are extremely sensitive to power outages, and even millisecond level power outages can lead to serious consequences. At the same time, under the global trend of energy transition, hospitals, as high energy consuming institutions, urgently need to improve energy resilience and reduce operating costs through energy storage systems.
This project plans to construct a 15MW/30MWh energy storage system to provide high reliability uninterruptible power supply (UPS) for hospitals, while achieving peak valley arbitrage, demand management, and emergency backup power, fully ensuring the safety of medical electricity use.
二、Current situation and challenges of hospital power supply
1. The requirement for power supply reliability is extremely high
The critical loads such as operating rooms and life support systems must meet 99.999% ("Five Nines") power supply reliability.
Traditional diesel generators take 5-10 seconds to start, which cannot meet millisecond level switching requirements, while energy storage UPS can achieve seamless switching.
2. Sensitivity to power quality
Precision equipment such as MRI and CT are sensitive to voltage dips and harmonic interference, which may cause equipment damage or data loss.
The energy storage system can provide voltage support and filtering functions to ensure the quality of electrical energy.
3. High pressure on electricity costs
The hospital operates 24 hours a day, with large fluctuations in the electricity load curve and a high proportion of electricity bills due to demand. Some regions implement time of use electricity pricing, with peak valley price differences reaching 2-3 times.
4. Environmental protection and policy driven
Various countries have increasingly strict requirements for carbon emissions from public institutions (such as NFPA 99 in the United States and GB 51039 Electrical Code for Medical Buildings in China). The noise and emissions issues of diesel generators conflict with the hospital environment.
三、15MW/30MWh Energy Storage System Solution
1. System architecture
Battery type: Lithium Iron Phosphate (LFP) battery, with a cycle life of ≥ 6000 times, in compliance with UL 9540A safety standard.
Power configuration: 15MW PCS (energy storage converter), supporting 4 limit operations (seamless switching between charging and discharging).
Energy storage capacity: 30MWh, capable of supporting critical loads of the entire hospital for more than 2 hours of power supply.
Intelligent control: Integrating EMS and hospital BA systems to achieve multi-mode collaborative optimization.
2. Core functions, functional technologies, implementation, and benefits
#Millisecond level UPS energy storage is linked with static switch (STS), with a switching time of less than 10ms to ensure zero interruption in operating rooms, ICUs, and other facilities
#Power supply, peak valley arbitrage, low valley charging (23:00-7:00), high peak discharging (8:00-12:00, 18:00-22:00)
#Expected to reduce electricity bills by 20% -30%, with real-time smooth load curve for demand management to avoid exceeding the peak demand limit within 15 minutes
#Reduce demand electricity fines (typical hospital saves $50k - $200k annually)
#Emergency backup power and diesel generator form a hybrid backup system, with energy storage prioritized for discharge, reducing diesel engine operating time by more than 80%
#Noise reduction and carbon reduction
#Power quality management, provision of reactive power compensation (SVG function), suppression of voltage flicker and harmonics (THD<3%), protection of precision medical equipment, and extension of service life
四、 Project necessity analysis
1. Rigid demand for medical safety
Meet the requirements of JCI (International Hospital Accreditation) and other standards for power redundancy.
To avoid the risk of accidents such as the 2019 power outage in New York hospitals causing ventilators to shut down.
2. Sustainable development
Reducing diesel usage by approximately 200000 liters per year is equivalent to reducing CO ₂ emissions by 500 tons per year.
Reserve interfaces for the construction of future photovoltaic+energy storage microgrids.
五、 Challenges and Countermeasures
1. Battery safety risk: Adopting a liquid cooling and heating management system, equipped with combustible gas detection and perfluorohexane fire extinguishing device
2. The hospital's electromagnetic interference (EMI) energy storage compartment is located at a distance of ≥ 50m from sensitive equipment, and the PCS adopts a three-level topology to reduce high-frequency harmonics
3. Land space limitations: Use 20 foot containerized energy storage, deployed on rooftops or parking lots
4. The approval process for grid connection is complex. Coordinate with the power company 6 months in advance and submit the IEEE 1547-2018 compliance report
六、Purpose
This project uses a 15MW/30MWh energy storage system to build a three in one energy solution for hospitals that combines "economy, reliability, and green low-carbon":
1. Safety value: Achieve zero interruption power supply for medical critical loads and meet the highest level of medical power standards.
2. Economic value: 5-7 years payback period, full lifecycle IRR>12%.
3. Social value: Enhance public health emergency response capabilities and lead the trend of green hospital construction.
This model can be replicated in high reliability power supply demand scenarios such as data centers and airports, becoming a benchmark case for the construction of new power systems.
