At present, the main forms of energy storage that can be used in urban rail transit are lithium battery pack
energy storage, super capacitor energy storage and flywheel energy storage. Among them, as an energy storage element that has developed rapidly in recent years, lithium-ion batteries can meet the requirements of regenerative braking energy absorption and release for rail transit in terms of capacity and power levels. In addition, compared with supercapacitors and lead-acid batteries, lithium-ion batteries have the advantage of high energy density, which can achieve miniaturization and light weight of the device. Therefore, choosing a lithium battery with fast charge and discharge and long life can meet the requirements of electrified rail transit. rail transit energy storage system The urban rail transit lithium battery energy storage system is shown in Figure 1. It is mainly composed of two-way DC/DC converter, controller, lithium battery pack and other components. Among them, the lithium battery cells are connected in series and parallel to form a lithium battery pack; the lithium battery pack is connected to the two ends of the traction network through a two-way DC/DC converter; the controller processes the traction grid and the lithium battery pack sent back by the sensor By controlling the conduction rate of the bidirectional DC/DC converter IGBT1 and IGBT2, the state monitoring signal controls the flow of electric energy between the traction network and the lithium battery pack, and realizes the automatic control of the charging and discharging of the lithium battery pack pack. u003cpu003e The energy storage device can be installed on a vehicle, called a vehicle-mounted type; it can also be installed on the ground or in a tunnel dedicated machine room, called a ground type. The ground type is used in this test. The rated voltage of the energy storage device is DC 1400~1800V, the rated capacity is 160 Ah, and the rated power is 240 kw. The rated voltage of the traction grid is DC 1500 V. energy storage system control strategyu003c/pu003eu003cpu003e There are three modes of traction starting, idling, and braking during the operation of the vehicle, which cause dynamic changes in the traction network voltage to decrease, constant, and rise, respectively corresponding to the energy storage system to release electrical energy , Standby, and power absorption three modes. Therefore, the voltage value of the traction network is selected as the control variable. During the acceleration and starting of the vehicle, the electric motor is in traction mode, and electric energy is obtained from the traction network through the VVVF inverter. When the energy storage system detects that Ut is less than the lower limit voltage set by the controller,. When the bidirectional DC/DC converter IGBT1 is turned off and IGBT2 is turned on (for the lithium battery pack is unidirectionally conducted to the traction network), the lithium battery pack’s electric energy is converted to the required voltage range of the traction network to supply power to the traction network as an auxiliary power supply The traction network voltage is above the lower limit voltage value. During the idling process of the vehicle, there is no energy exchange between the vehicle and the traction network, the voltage of the traction network does not change, and the energy storage system does not start and is in a standby state. In the process of regenerative braking, the motor of the vehicle works as a generator, which converts the kinetic energy of the vehicle into electric energy, and the obtained regenerative electric energy is fed back to the traction network through VVVF rectification. When the energy storage system detects that U is greater than the upper limit voltage set by the controller, IGBT1 of the bidirectional DC/DC converter is turned on and IGBT2 is turned off (the traction network is unidirectionally connected to the lithium battery pack), and the power of the traction network Convert the voltage and current range required for charging the lithium battery pack to charge the lithium battery pack pack. That is, the energy storage system absorbs regenerative electric energy and maintains the traction network voltage below the upper limit voltage value. u003c/pu003eu003c/pu003e
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