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Hybrid regenerative braking power utilization device
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Introduction：
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2019/08/05 12:06
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Product description
Technical parameters
Hybrid regenerative braking power utilization device
Product features
- in the existing line only need to add super capacitor, convenient existing line transformation.
- the bi-directional DCDC converter of supercapacitor energy storage and the unidirectional DCDC converter of resistance absorption are designed in a modular way for easy maintenance.
- only hanging on the dc contact network, more safe and reliable for medium voltage ac power grid.
- no energy feedback to the ac grid, will not cause pollution or impact on the ac grid.
Energy saving benefit analysis
■ save recycled electric energy
It is estimated that each regenerative braking of the train can save electric energy 3kWh, according to the train braking every 2 minutes once, the daily working time is 16 hours, 365 days a year, a year can save electric energy 525,600 kWh. Calculated by 0.8 yuan/KWH, it can save 420,000 yuan of electricity cost.
■ reduce tunnel fan energy consumption
Take chongqing metro line 1 as an example, the total power of the tunnel fan is 896kW, and the average energy consumption of the fan is 16128kWh per day, saving energy for one year
5886720kWh, saving 4.66 million yuan of electricity. At the same time, the fan start cycle of underground station is shortened, which reduces the underground dust pollution and protects the underground tunnel environment.
■ power factor penalty
It is estimated that each line can save about 4 million yuan per year.
Reduce construction investment costs
If only vehicle resistance braking is considered in subway line, the heat consumed by resistance will escape into the hole, which will increase the investment in environmental control equipment and civil engineering. A 17km subway line is estimated to require an additional investment of more than 90 million yuan. And adopting regenerative braking and ground absorption scheme can save investment of nearly 50 million yuan.
■ reduce vehicle electrical purchase costs
If the vehicle has a resistance braking link, it is preliminarily estimated that the cost of a single bullet car is about 150,000 yuan for the on-board resistance and resistance control device. Changchun light rail line is equipped with 40 cars, and the purchase cost of this part is nearly 6 million yuan. If this part of the electrical procurement from abroad, the purchase cost of nearly 8 million yuan. After adopting ground absorption, this cost can be saved.
■ reduce vehicle weight and improve vehicle load capacity
Changchun light rail vehicle is equipped with resistance braking system, the weight of resistance equipment is about 800kg. After eliminating the on-board resistance, the dead weight of the vehicle is effectively reduced, and the load capacity of the vehicle can be improved under the same traction power condition. In other words, with the same amount of traction power, traction power consumption can be reduced by 2%. Improved vehicle equipment layout space, reduce the maintenance workload.
At present, the space for vehicle equipment layout is rather tight, but a brake resistance unit needs to occupy a space of 2016×610×1440(mm). If the on-board resistance is cancelled, this part of space can be fully utilized. Due to the use of on-board brake resistance, the resistance and control system needs to be maintained regularly, which increases the maintenance workload and the purchase cost of spare parts. The ground absorption method is adopted, because no one is on duty for the equipment, the workload of maintenance and repair is greatly reduced. At the same time, the working conditions of the ground equipment are better than that of the vehicle, and the corresponding purchase cost of spare parts is less, which saves the maintenance, accessories and labor costs of the equipment.
■ improved operational system reliability
Ground regenerative braking absorption device is to realize constant voltage absorption control, using the relative voltage judgment mode, as long as the voltage appears in the system is higher than its judgment voltage value, the equipment is put into work, to absorb it. Thus, the system overvoltage is effectively suppressed to ensure the safe and reliable operation of the power supply system.