The Energy Consumption Method Based on Synthetic Optimization of Speed and Power Allocation for Fuel Cell-Battery Hybrid Tramway

The saving of operating energy consumption of traditional tramway powered by catenary line mainly depends on the optimization of speed curves. Unlink that, the fuel cell-battery hybrid tramway carries multiple power sources with different characteristics to supply power, and the operation energy consumption of fuel cell-battery tramway is related to not only the running speed, but also the power allocation between sources. However, the traditional method for fuel cell hybrid tramway to reduce consumption is using algorithms to optimize the energy management of load power based on the predetermined speed curves. Therefore, this paper develops the synthetic optimization of speed and power allocation to decrease the energy consumption of fuel cell hybrid tramway. Firstly, the tramway’s dynamic model is established to analyze the load power. Then, the electricity consumption of battery is converted to the hydrogen consumption based on the equivalent principle. In this way, the energy from battery and fuel cell are transferred as an indicator: the equivalent hydrogen consumption, to evaluate the operating energy of the tramway. Afterwards, the synthetic optimization model is established aiming at the minimizing the consumption within stations. The pseudospectral method is employed to solve this problem. It turns out that the proposed method could obtain the running speed curve and power distribution sequence simultaneously. The speed curve guarantee on time operation and the load power is reasonably allocated.