Energy optimal distribution method for electric vehicle hybrid energy storage system
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An electric vehicle and composite energy storage technology, applied in the field of energy distribution of composite energy storage systems, can solve the problems of poor distribution effect and long running time, and achieve the effects of reducing power range, short running time, and reducing the amount of calculation.
Inactive Publication Date: 2018-07-31
HARBIN UNIV OF SCI & TECH
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[0009] The present invention aims to solve the problems of long running time and poor distribution effect of existing methods for distributing the power of a composite energy storage system. The present invention provides an energy optimal distribution method for a composite energy storage system of an electric vehicle
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specific Embodiment approach 1
[0042] Specific implementation mode one: see figure 1 Describe this embodiment, the energy optimal distribution method of the electric vehicle composite energy storage system described in this embodiment, the composite energy storage system includes a supercapacitor bank 1, a bidirectional DC / DC converter 2, a battery pack 3, and an inverter 4 and vehicle controller 5,
[0043] After the supercapacitor pack 1 and the bidirectional DC / DC converter 2 are connected in series, they are connected in parallel with the battery pack 3 to form an energy storage system; the energy storage system supplies power to the motor of the electric vehicle through the inverter 4; the vehicle controller 5 It is used to collect the data information of the electric vehicle motor, and is also used to control the bidirectional DC / DC converter 2;
[0044] The allocation method includes the following steps:
[0045] Step S1, the output power P of the battery pack 3 b , the output power P′ of the supe...
specific Embodiment approach 2
[0055] Specific implementation mode two: see figure 1 This embodiment is described. The difference between this embodiment and the energy optimal distribution method of the electric vehicle hybrid energy storage system described in the first specific embodiment is that the convex optimization method is used in the step S1 to generate the optimized total output of the electric vehicle. The specific process of the comparison table of power and output power of supercapacitor group 1 is as follows:
[0056] Step S11, define the objective function of convex optimization as Convex optimization constraints are shown in Formula 1;
[0057]
[0058] Among them, t 0 Indicates the start time of a cycle condition, t f Indicates the end time of a cycle working condition, t is a time variable;
[0059] P aux is the auxiliary power of the electric vehicle,
[0060] I b min is the minimum output current of the battery cell, I b max The maximum current output by the battery cell, ...
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Abstract
The invention provides a composite energy storage system energy optimization and allocation method of an electric automobile and belongs to the field of composite energy storage system energy allocation. The problem that an existing composite energy storage system energy allocation method is long in operating time and poor in allocation effect. Firstly, a convex optimization method is adopted to generate a comparison table of the total output powder of an electric automobile after optimization and the output power of a super-capacitor bank; secondly, a two-dimensional array is established according to the comparison table, a whole automobile controller calculates the total toque required by the electric automobile in action operation according to the acquired speed of the electric automobile, front and rear motor rotation speeds and the opening degree of an accelerator pedal and calculates the real-time required powder Pd of the electric automobile according to the required total torque and the speed of the electric automobile; finally, the real-time output powder Psc of the super-capacitor bank is looked up from the two-dimensional array according to the real-time required powder Pd; according to the real-time required powder Pd, a two-way DC / DC converter is controlled so as to complete the energy allocation of the electric automobile. The composite energy storage system energy optimization and allocation method is used for energy allocation.
Description
technical field [0001] The invention belongs to the field of energy distribution of a composite energy storage system. Background technique [0002] In order to save our country's oil resources and protect our country's environment, the government vigorously promotes the development of new energy sources. Electric vehicles have gradually entered people's field of vision. Today, electric vehicles mainly use lithium iron phosphate batteries to provide power for electric vehicles. However, there are still many problems in my country's battery technology. At the same time, although the lithium iron phosphate battery has a high energy density, the power density cannot meet satisfactory requirements. In order to solve this problem, the usual practice is to use a composite energy storage system composed of lithium iron phosphate batteries and supercapacitors to provide energy for electric vehicles. Supercapacitors have high power density, which can ensure the speed requirements...
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