解决方案介绍  Solution introduction：

鼎汉提供两种技术成熟的再生制动能量利用系统，分别为超级电容储能系统和逆变回馈系统，均支持750V、1500V两种接触网电压体制。其中，超级电容储能系统标准额定运行功率为1MW；逆变回馈系统标准额定运行功率为1MW～4MW。

Dinghan provides two braking energy management systems based on mature technologies, including super capacitor energy storage system and inverter feedback system both of which support 750V and 1500V voltage systems from the overhead contact line system. Thereinto, the normal operating power of the super capacitor energy storage system is 1MW and the one of the inverter feedback system is 1MW～4MW.

The super capacitor energy storage system mainly consists of DC-DC bidirectional converters and super capacitors. When the voltage of the overhead line system rises since a train pulls in and regenerative braking stop occurs, the super capacitor energy storage system will lower the voltage of the electric energy supplied by the overhead line system through the converter and then charge the super capacitor of energy storage cabinet; on the contrary, when the train pulls out or is driving normally, the super capacitor energy storage system will begin to discharge and the electric energy will be sent to the DC overhead line system. This system realizes the recycling and reusing of braking energy and the function of stabilizing the voltage of the overhead contact line system and plays a role of peak load shifting.  

逆变回馈系统主要由逆变装置和隔离变压器组成。当列车进站并发生再生制动停车导致接触网电压上升，逆变装置将接触网的直流电逆变成交流电，经隔离变压器回馈至交流中压电网，使接触网电压稳定在设定范围内。

The inverter feedback system mainly consists of invertion devices and isolation transformers. When the voltage of the overhead contact line system rises since a train pulls in and regenerative braking stop occurs, the inverter device will converts the direct current of the overhead contact line system into alternating current and then the alternating current will be sent back to the AC medium voltage distribution network through the isolation transformer, so as to make the voltage of the overhead line system stabilize within the specified range.      

 方案应用  Solution application：

 再生制动能量吸收利用系统覆盖750V、1500V两种电压体制，应用于如地铁等启动、制动频繁、制动功率大等特点的城市轨道交通中，实现再生制动能量的吸收与再利用，不仅保障轨道交通运行安全，而且实现节能目的及产生较大的经济效益。

The regenerative braking energy absorption and utilization system covers 750V and 1500V voltage systems and is applied to the urban rail transit such as railway and so on which have the characteristics of frequent start and braking, large braking power and other characteristics, realizes the absorption and reusing of regenerative braking energy, and not only ensures the safe operation of rail transit, but also realizes the energy conservation purpose and produces greater economic benefits.