Application of High-power Bidirectional DCDC of Shanghai Wenlida Power Electronics Co., Ltd. in Rail Transit Energy Saving
Shanghai Wenlida Power Electronics Co., Ltd. has been deeply engaged in the field of power electronics for many years. The high-power bidirectional DCDC developed by the company has demonstrated outstanding performance in many fields, especially playing a crucial role in rail transit energy saving.
Technical Characteristics of High-power Bidirectional DCDC
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High-efficiency Conversion: The high-power bidirectional DCDC of Wenlida features extremely high conversion efficiency, with the full-load efficiency of some models reaching up to 98%. For example, the 800V series bidirectional DC/DC (air-cooled) products achieve efficient power conversion through fully digital design, reducing energy loss during the conversion process and laying a solid foundation for rail transit energy saving. In rail transit, efficient power conversion means that more electrical energy can be effectively utilized, reducing the overall energy consumption.
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Flexible Power Configuration: The company's bidirectional DCDC supports multi-unit parallel operation, which can meet the requirements of high power and large current. In the rail transit system, the power requirements vary greatly under different lines and operating conditions. Through multi-unit parallel connection, the power can be flexibly configured according to actual needs. Whether it is a busy main line or a branch line with relatively small passenger flow, the stable and efficient operation of the power supply system can be ensured.
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Fast Response and Precise Control: The products adopt advanced control algorithms and have a fast response speed. They can instantly respond to the trigger signals of the protection system and stop the charging and discharging actions of the energy storage unit in a timely manner to protect the safety of the equipment. At the same time, the multi-loop control technology of voltage and current makes the output more stable. During the operation of rail transit, the instantaneous working conditions such as the start, acceleration, and braking of the train change frequently. The bidirectional DCDC of Wenlida can quickly and accurately adjust the output to ensure the power supply quality.
Application Principles in Rail Transit Energy Saving
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Regenerative Braking Energy Recovery: Urban rail transit trains have the characteristics of short station spacing and frequent starting and stopping, and a large amount of regenerative electrical energy is generated during the braking process. The high-power bidirectional DCDC of Wenlida can convert the high-voltage electrical energy generated by the train's braking into a form suitable for storage in energy storage devices through specific conversion technologies. For example, in some lines of Ningbo Rail Transit, bidirectional converters have successfully recovered the regenerative electrical energy generated by train braking. Through high-power bidirectional DCDC, the electrical energy is stored in energy storage devices such as supercapacitors or batteries. When the train needs electrical energy again, the stored energy can be released for the train to use, realizing the cyclic utilization of energy and effectively reducing the electrical energy consumed per unit time by the train traction system.
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Optimizing the Stability of the Power Supply System: In the rail transit power supply system, problems such as voltage fluctuations may affect the normal operation of equipment and energy consumption. The bidirectional DCDC of Wenlida can stably regulate the power supply voltage. When the grid voltage fluctuates, it can quickly respond and maintain the stability of the DC bus voltage through bidirectional power flow. This not only ensures the stable operation of trains and equipment along the line but also avoids additional energy consumption caused by unstable voltage, further enhancing the energy-saving effect.
Application Advantages
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Significant Energy-saving Effect: Taking the application of energy feedback devices (some adopt technical principles similar to those of Wenlida's bidirectional DCDC) on multiple lines such as Chongqing Rail Transit Loop Line and Lines 1 and 3 as an example, a total of approximately 50 million kWh of electricity has been fed back in the past three years, accounting for about 4% of the total traction electricity consumption. The application of Wenlida's high-power bidirectional DCDC in rail transit can effectively recover regenerative braking energy, reduce the demand of trains for external grid electricity, and thus reduce the energy consumption of the entire rail transit system, achieving remarkable results in energy conservation and emission reduction.
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Improving System Reliability: The products are equipped with perfect protection functions, such as undervoltage, overvoltage, overcurrent, and short-circuit protection. In the complex operating environment of rail transit, these protection functions can ensure the safe and stable operation of the bidirectional DCDC and the entire power supply system. Once an abnormal situation occurs, the protection mechanism is quickly activated to avoid equipment damage and the expansion of faults, ensuring the normal operation of rail transit and reducing additional energy consumption caused by equipment failures and operational interruptions.
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Compatibility with Various Energy Storage Devices: Wenlida's high-power bidirectional DCDC can be adapted to various energy storage devices such as fuel cells, flow batteries, and lithium batteries. In rail transit, different lines or stations can select appropriate energy storage devices to be used in combination with bidirectional DCDC according to their actual situations. For example, in some stations with high space requirements, a lithium battery energy storage system with a high energy density can be selected to cooperate with bidirectional DCDC to achieve efficient energy storage and release.
Practical Application Cases
The high-power bidirectional DCDC of Shanghai Wenlida Power Electronics Co., Ltd. has been applied in multiple rail transit projects. In the construction of a new subway line in a certain city, a scheme combining Wenlida's high-power bidirectional DCDC with a supercapacitor energy storage system was adopted. When the train brakes, the bidirectional DCDC efficiently stores the regenerative electrical energy into the supercapacitor. When the train starts and accelerates, the electrical energy in the supercapacitor is quickly released to the train through the bidirectional DCDC. According to actual operation data monitoring, the energy consumption of the trains on this line is reduced by approximately 8% compared with the lines without this technology, and the energy-saving effect is remarkable. At the same time, due to the improvement of the stability of the power supply system, the punctuality rate of train operation has also increased, providing passengers with a better travel service.
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