An energy management method for a vehicle-mounted fuel cell hybrid power system

Abstract

The invention relates to the technical field of new energy vehicle energy management and specifically relates to an energy management method of a vehicle-mounted fuel battery hybrid power system. Theenergy management method of the vehicle-mounted fuel battery hybrid power system comprises the following steps of 1, establishing a hybrid power system model; and 2, considering a demand power changerate and an effect of a lithium battery SOC on the basis of the hybrid power system model established in the step 1 so as to manage energy of the hybrid power system. According to the energy management method of the vehicle-mounted fuel battery hybrid power system, the change rate of load demand power is considered in the hybrid power energy management method; by adding the vehicle working condition information, the performance of the hybrid power system can be better on the one hand, and the vehicle operation working condition applicable to the method is wider on the other hand. According tothe energy management method of the vehicle-mounted fuel battery hybrid power system, during determining an actual current of a lithium battery, a maximum charging and discharging current of the lithium battery is restricted to prevent overcharging and over-discharging of the lithium battery. According to the energy management method of the vehicle-mounted fuel battery hybrid power system, an additional control current is calculated through fuzzy control according to a current lithium battery SOC state so that the lithium battery SOC is kept within a reasonable interval.

Description

technical field [0001] The invention relates to the technical field of energy management of new energy vehicles, in particular to an energy management method of a vehicle-mounted fuel cell hybrid power system. Background technique [0002] New energy vehicles are energy-saving and environmentally friendly, which is an inevitable trend in the development of the automobile industry. Among them, vehicle energy power system is an important technical direction of new energy vehicles. The fuel cell system has the characteristics of high efficiency, zero emission, adaptability to different power requirements, and fast energy replenishment, and is widely used in vehicle power systems. However, due to the hysteresis of the electrochemical reaction and auxiliary equipment such as air compressors and supply pipelines, the pure fuel cell system has a slow dynamic response, limited ability to follow the load, and cannot meet the rapidly changing load power demand. By constructing a fue...

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Problems solved by technology

The publication number is CN108248450A, and the announcement date is December 12, 2017. The title of the invention is "a fuel cell hybrid power optimization method". The invention first models the fuel cell hybrid power system, and then performs real-time optimal control of the energy ; The invention proposes to pass penalty factor K SOC It can better control the reasonable distribution of energy, maintain the battery SOC in an appropriate range, and enter the optimal power management state, but it does not mention the specific power distribution method of the fuel cell and the battery, nor does it explain how the battery SOC is obtained

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