Decentralized Power Flow Control for Electric Vehicle Energy Storage
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Solution Overview
Problem
Current energy management systems for electric vehicles, particularly driverless mobile assistance systems, lack efficient and decentralized control over power distribution between different energy storage devices, leading to suboptimal handling of peak loads and inefficient energy utilization.
Innovation Solution
A method that utilizes a converter device to dynamically adjust and regulate power flow between two energy storage devices, allowing for simultaneous or individual power supply/demand, with decentralized setpoint generation based on detected direct voltage, and inductive energy transfer for efficient charging and reduced wear on storage devices.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If a central control device manages power distribution between energy storage devices, then comprehensive control is achieved, but computational burden and system complexity increase
Solution Approach 1:
The control system is segmented into a central control device for high-level decision making and decentralized control units at each energy storage device for local power flow management. This segmentation reduces the computational burden on the central controller while maintaining comprehensive control capability.
Solution Approach 2:
Each energy storage device is equipped with its own control unit that can autonomously manage its power flow based on local conditions and received instructions. This self-service capability reduces the need for complex centralized computation and enables faster local responses.
2Productivity
If conventional direct connection is used between energy storage devices and power distribution, then system simplicity is maintained, but peak loads cannot be quickly absorbed
Solution Approach 1:
The system uses controllable power conversion devices (DC-DC converters) that enable dynamic adjustment of power flow between energy storage devices and the power distribution network. This dynamic capability allows rapid absorption of peak loads while maintaining system flexibility.
Solution Approach 2:
The power conversion devices can dynamically change operating parameters such as conversion ratio, switching frequency, and control mode to optimize power transfer. This enables the system to quickly respond to peak loads by adjusting conversion parameters in real-time.
3Duration of action of moving object
If frequent charging cycles are applied to extend operational duration, then energy availability is improved, but service life of energy storage devices decreases
Solution Approach 1:
The system merges multiple energy storage devices with different characteristics (e.g., different charge/discharge rates, different lifespans) to create a hybrid energy storage system. This combination allows the system to achieve extended operational duration by utilizing the strengths of each device while mitigating their individual weaknesses regarding service life.
Solution Approach 2:
The power conversion devices act as intermediaries that manage charge/discharge cycles intelligently. They can buffer power flows, smooth out frequent charging demands, and optimize the operating conditions of each energy storage device to extend their service life while maintaining operational duration.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
Enables quick absorption of peak loads, optimized energy distribution, extended service life of energy storage devices, and reduced computational burden on the central control device, with the ability to adapt to changing power requirements and environmental conditions.
Implementation Method 1
a converter device (7) which is connected to the first energy storage device (8) and via which the power flow (P1) is regulated
Implementation Method 2
inductive energy transfer for efficient charging
Data Source
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AI summary
Method for operating an electric vehicle and electric vehicle, having an electric traction drive device for the travel motion, in particular traction, of the vehicle, a control device for controlling the travel motion of the vehicle, a first energy storage device, which is embodied, in particular, as a rechargeable hybrid storage device, and a second energy storage device, in particular double-layer capacitor device, which can be charged and discharged more quickly than the first energy storage device, wherein the electric traction drive device is supplied with drive power via an energy distribution means which conducts a DC voltage, wherein a first, in particular bidirectional, power flux between the first energy storage device and the energy distribution means is reduced to a setpoint value by means of a converter device, in particular by means of a bidirectional DC/DC converter, and wherein a, in particular bidirectional, second power flux between the second energy storage device and the energy distribution means is set, in particular automatically, wherein the DC voltage is detected by the converter device, and the setpoint value is determined in the converter device as a function of the detected DC voltage.