Electric Vehicle Power Aggregation for Grid Stability
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Solution Overview
Problem
Current power grid systems face challenges in managing power flow efficiently, particularly during peak demand periods, and lack the flexibility to aggregate small-scale resources like electric vehicle batteries for grid stabilization and energy management, leading to inefficiencies and increased costs.
Innovation Solution
A power aggregation system that uses a centralized server to coordinate charging activities of electric vehicles, employing a power flow manager to optimize power flow strategies, including site-level charging, AGC commands for resource regulation, and network fingerprinting for device location determination, while minimizing network traffic and translating communication protocols.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a centralized power management system coordinates charging activities of electric vehicles, then grid stability and power flow efficiency are improved, but system complexity and communication requirements increase
Solution Approach 1:
The system segments power management into hierarchical levels: site-level power flow managers handle local charging coordination, while a central server provides aggregate oversight. This segmentation allows distributed decision-making that improves grid stability without requiring a fully centralized complex system, as each segment operates semi-autonomously within its scope.
Solution Approach 2:
The patent introduces communication protocol translation devices as intermediaries that convert between different protocols (CAN-bus, ZigBee, Homeplug, Ethernet). These intermediaries simplify system complexity by providing a standardized interface layer, allowing diverse devices to communicate through common gateways rather than requiring direct complex point-to-point communications.
2Adaptability or versatility
If multiple communication protocols are supported for different devices, then adaptability and device compatibility are improved, but communication system complexity increases
Solution Approach 1:
The patent implements universal communication gateways that can translate across multiple protocols (CAN-bus, ZigBee, Homeplug, Ethernet). These gateways perform multiple functions: protocol translation, message routing, and device identification. By making the gateway multi-functional, the system achieves broad protocol compatibility without requiring separate dedicated communication paths for each protocol type.
Solution Approach 2:
Communication protocol translation devices serve as intermediaries between devices using different protocols. Rather than requiring direct compatibility between all device pairs, the intermediary gateway translates messages between protocols, enabling indirect communication. This reduces complexity by centralizing translation logic in the gateway rather than embedding it in every device.
3Loss of energy
If network traffic is minimized for power flow management communications, then energy efficiency is improved, but information transmission completeness may be compromised
Solution Approach 1:
The system applies partial action by transmitting only essential power flow management information over the network rather than all possible device data. The power flow manager selectively requests and transmits only the minimum necessary information for coordination (power levels, charging status, pricing signals), reducing network traffic and energy consumption while maintaining sufficient information for effective power management.
4Reliability
If electric vehicle batteries are aggregated as distributed resources, then grid stabilization capability is improved, but control and coordination difficulty increases
Solution Approach 1:
The patent merges individual electric vehicle batteries into an aggregated distributed energy resource through the power flow manager. By combining control of multiple batteries under a single management entity, the system achieves grid stabilization capability equivalent to a large centralized resource while maintaining the physical distribution of batteries. The merging occurs at the control level, simplifying coordination compared to managing each battery independently.
Data Source
AI summary
A system that enables power flow management for electrical devices, such as electric vehicles. Power flow managers can coordinate charging activities. Power flow decisions may be based on site-level information. Power flow management strategies may be optimized. Power spikes may be avoided by using safe failure modes. Generation stacks may be used for reducing cost. AGC commands are used to control power resources. Power regulation are apportioned to power resources, and power regulation ranges may be determined. Power flow strategies are implemented in response to changes in intermittent power flow. Locations of devices may be determined using network fingerprints. Power flow measurements are determined, and AC power flows are inferred from DC power flows. Network traffic consumption are minimized. Communication protocols are translated. Enhanced vehicle communications are provided that communicate to vehicle subsystems, that arbitrate smart charge points, and that use existing hardware, non-specific hardware, or control extensibility systems.