With the increasing complexity of urban rail transit networks and the increasing density of operations, the metro power supply system is facing unprecedented dual challenges: on the one hand, extreme reliability requirements have never decreased, and the loss of power to any critical load may trigger a chain reaction; On the other hand, refined energy efficiency management has become a rigid demand, and the traditional extensive power supply model can no longer meet the requirements of green and low-carbon development.
According to the official procurement announcement, the entire line network, including Lines 1, 2, 3 and S1, is expected to consume about 401 million kWh of electricity in 2025 - its operating hours are mainly concentrated from 6:30 to 23:30 every day, a total of about 17 hours. Based on this, it can be roughly estimated:
• Average daily electricity consumption: about 1.1 million kWh (401 million kWh ÷ 365 days)
• Average hourly electricity consumption during peak hours: about 65,000 kWh (1.1 million kWh ÷ 17 hours)
This is equivalent to the total daily electricity consumption of about 220,000 ordinary households (estimated at 5 kWh per day), and during peak hours, the hourly electricity consumption is enough to support a large community for a day. Another set of data shows that Xi'an Metro will operate about 311.6 kilometers in 2023, with a cumulative total electricity consumption of about 600 million kWh that year, and according to this calculation, its annual electricity consumption per kilometer of line is about 1.926 million kWh.
Although the individual power consumption of lines in different cities varies greatly, there is a clear consensus that the subway is an out-and-out "big electricity consumer". Because of this, energy conservation and consumption reduction are not only the need to control costs, but also an important social responsibility.
How to "save electricity" for the subway? Multi-pronged wisdom
In this context, the days of simply providing discrete devices are over. With its technology accumulation in the five core areas of platform door power supply system, AC/DC power supply system, uninterruptible power supply (UPS), intelligent lighting power supply system, intelligent emergency lighting and evacuation power supply system, Huiyeda is redefining the paradigm of subway power application - from "guaranteed power supply" to "energy management", from "passive response" to "active prevention", to build an integrated digital energy solution covering the key scenarios of subway primary and secondary loads. Technical architecture: Five-layer defense-in-depth system The first layer: create an efficient, flexible and intelligent energy hub Multi-standard precise conversion: through core equipment such as 24 pulse rectifier units, the AC power is efficiently and converted into DC traction power required by the train; At the same time, it provides pure alternating current power to the station through the distribution transformer, which mainly solves the problems of power conversion, distribution and guarantee. Huiyeda AC and DC power supply system The second layer: subway "power bank" - industrial-grade UPS system The "brain" of the metro (signaling, communications, integrated monitoring system) can be called the most sensitive load. Even millisecond voltage fluctuations can trigger system restarts, leading to train delays or even operational disruptions. Our way of protection: not only backup, but also "purification" and "prediction" Ensure the continuity of core business: Build an absolutely safe power defense line for critical loads to prevent data loss, equipment damage, production interruption, and security accidents caused by power problems. Reduced total cost of ownership (TCO): Efficient energy efficiency directly reduces electricity bills; intelligent battery management extends battery life and reduces replacement costs; Preventive O&M reduces downtime losses; Modular design optimizes initial investment and future expansion costs. Empower intelligent management: Transform UPS from a "black box" device to a digital asset, realize transparent management, data-driven decision-making, and automation of operation and maintenance processes, greatly improving management efficiency and response speed. Strengthen security guarantees: Provide power guarantees that meet the highest safety standards in the industry for important information systems, support equipment, industrial control cores, etc., and fulfill corporate social responsibility. Huiyec UPS power supply system The third layer: [high reliability executor] for boarding and disembarking safety - intelligent platform door power supply system The platform door is the first physical barrier to protect the safety of passengers, and the reliability of its power supply directly determines whether this barrier is indestructible. Traditional general-purpose power solutions are difficult to cope with special load challenges such as frequent opening and stopping of subway platform doors and motor shocks. Our execution plan: deep integration, turning passivity into initiative Dedicated customized switching: For the high-current impact at the moment of the platform door motor starting, the system has redundant protection functions and supports seamless switching, ensuring smooth and reliable power switching and extending the life of the equipment. Status depth visualization: Integrate the power supply status (voltage, current, module health) into the platform door control system in real time. O&M personnel can not only know whether the door is faulty, but also gain insight into whether the power supply is in a sub-healthy state in advance to achieve predictive maintenance. Extreme Situation Protection: Adopting a dual-channel independent power supply design, even in the extreme case of power loss in the whole station, our power system can still provide emergency lighting and indication for the manual unlocking mechanism of the platform door, ensuring that the life channel can be opened manually without pinning safety on a single condition. Huiyeda platform door power supply system The fourth layer: the [smart energy-saving housekeeper] of green operation - the subway smart lighting system Lighting is the "big energy consumer" of the subway, accounting for 20%-30% of the total energy consumption of the station. Our smart strategy: make every kilowatt-hour of electricity create comfort and value On-demand lighting, say goodbye to waste: through the fusion of multiple sensors such as illuminance, human body sensing, and train position, it realizes "the lights are on when the car is on, and the lights are dim when people walk". Differentiated management of public areas, tunnels, and equipment areas, the light environment is always comfortable, and energy consumption is greatly reduced. Visual management, operation and maintenance innovation: In the background management interface, you can intuitively view the location, status and energy consumption of each light. Automatic alarm and positioning of faulty lamps change "manual inspection of needles in a haystack" to "system prompts accurate troubleshooting", greatly improving operation and maintenance efficiency. Significant return on investment: Practical applications show that the smart lighting system can help subway customers reduce lighting energy consumption by 20%-40%, and usually recoup investment through electricity bill savings within 2-3 years, which is a green upgrade with both social and economic benefits. Huiyeda intelligent lighting power supply system The fifth layer: [Guide of Life Light] in critical moments - intelligent emergency lighting and evacuation system Traditional evacuation signs are "static" and "silent", with fixed arrows that may point to dangerous areas in complex and changeable fire smoke. Our life guide: dynamic intelligence, light up the way of life Dynamic path planning: Through real-time monitoring and relying on the central intelligent platform, the system dynamically analyzes fire trends, automatically generates safe escape routes, and adjusts the direction of indicator lights in real time to guide the crowd to avoid danger. Centralized intelligent control: Centralized power supply is used to monitor and manage all evacuation signs and emergency lighting in a unified manner. The system automatically completes battery charging and discharging maintenance, and reports the status of each end lamp in real time to ensure that it is 100% lit at critical moments. Multiple power supply guarantees: linked with the first-level UPS system to form a three-level power supply guarantee of mains power, UPS batteries, and evacuation systems with their own batteries, ensuring that the light of life guidance is never extinguished. Practical verification value: Simulation drill data shows that this dynamic intelligent evacuation system can shorten the safe evacuation time of personnel by 25%-35%. In a real fire where every second counts, this means huge possibilities for saving lives. Huiyeda intelligent emergency lighting and evacuation power supply system Instead of five separate products, we offer an organically synergistic energy ecosystem. This system achieves: Leap in security level: from passive protection to active prevention, establish a multi-level and intelligent security defense system Revolution in energy efficiency: From extensive power consumption to fine regulation, every kilowatt-hour of electricity creates maximum operational value Transforming Operations: From manual inspections to predictive maintenance, dramatically improving operational reliability and efficiency Extension of value: From cost center to value creation, energy management opens up new efficiency growth points for subway operations The meaning of energy saving: beyond the numbers of electricity bills The efforts of subway energy conservation will eventually be reflected in three levels: 1. Environmental value: It directly reduces carbon emissions at the power generation end, and each subway line is equivalent to planting 100,000 trees per year. For another example, Qingdao Metro's energy-saving measures are expected to reduce carbon emissions by 91,000 tons a year. 2. Economic value: Significantly reduces long-term operating costs, making rail transit more sustainable. • 15-25% reduction in electricity bills (one line can save millions a year) • Maintenance workers do not have to climb up and down every day to check the lamps • The life of the equipment is generally extended by more than 30% 3. Social value: As a public infrastructure, the green practices of the subway lead the low-carbon transformation of the city. For us the public, there is a safer riding environment, a more comfortable visual experience, and more punctual travel services. All in all, what drives the subway is not only the huge power, but also the energy-saving wisdom that continues to advance. Every smooth start and stop, every automatically dimmed light, and every recovered brake energy is writing a greener and more efficient future for the city. In the new era of intelligent and green rail transit, we will continue to deepen the "calculable safety and energy efficiency" technology, help each subway line become a safe, efficient and low-carbon urban artery, and inject a steady stream of smart energy into sustainable urban development.
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