Hybrid energy feedback type direct-current traction power supply device and control method

Abstract

The invention discloses a hybrid energy feedback type direct-current traction power supply device and control method. The device comprises a diode rectifying component providing traction power and a brake energy processing component parallelly connected with the diode rectifying component. The brake energy processing component comprises a feedback branch and an energy accumulation branch, wherein the feedback branch converts the brake energy and feeds the converted brake energy back to an alternating-current power grid or provides and replenish traction power, and the energy accumulation branch accumulates the redundant brake energy. The control method is used for performing direct-current traction power generation and brake energy processing, and the method is simple to implement, energy saving, safe and reliable. The hybrid energy feedback type direct-current traction power supply device is simple and reliable, low in loss and high in overload capacity during traction energy supply, capable of processing the brake energy, feedback, accumulation and recycling of the brake energy are achieved, energy waste is reduced while system cost is lowered, and a traction network is stable in voltage and small in required mounting space.

Description

technical field [0001] The invention relates to the field of urban rail DC traction power supply systems, in particular to a hybrid energy-feedback DC traction power supply device and a control method. Background technique [0002] At present, most of the urban rail power supply systems in the world use diode rectification technology to realize the conversion from AC power supply to DC traction power supply. Especially after the use of 24-pulse rectification technology, the problem of harmonic compatibility with the power grid has been well solved. , and the diode rectifier has a strong overload capacity and high reliability, and can meet the requirements of short-term large current taking during the starting process of the vehicle. Such as figure 1 As shown, the traditional 24-pulse diode rectification system structure consists of two 12-pulse rectification units 12, +7.5° rectification transformer 111 and -7.5° rectification transformer 112 to form a diode rectification c...

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Problems solved by technology

[0004] (1) Energy can only flow in one direction. When the train brakes, only part of the energy is absorbed by the train in the traction state under the same power supply network. big waste of energy

[0005] (2) Due to the heating of the braking resistor, the platform and underground tunnels will accumulate heat and the temperature will rise

Some urban rail systems have to increase the capacity of the tunnel ventilation system and air conditioning system, resulting in secondary energy consumption

[0006] (3) When the on-board braking resistor mode is used, the braking resistor increases the weight of the train, resulting in a decrease in the payload capacity of the train and increasing the power loss caused by this part of the load

[0007] (4) The diode rectifier device cannot control the DC side voltage, and its voltage is affected by the voltage stability of the AC traction network and the fluctuation of the load. In severe cases, the DC voltage of the traction network fluctuates in a large range, which is not conducive to the smooth operation of the vehicle

Since the overload capacity of fully-controlled devices such as IGBTs used in this solution is much smaller than that of diodes, its capacity must be designed according to the maximum overload of the system, which will cause a great waste of power supply capacity of the system

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