EV Inverter Frequency Control for Islanded DER Power Flow
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Solution Overview
Problem
Existing systems struggle to efficiently manage power distribution and synchronization among distributed energy resources, such as electric vehicles, solar panels, and home energy storage systems, especially during grid outages or when surplus power is generated, without direct communication between these resources.
Innovation Solution
An AC coupled controller adjusts the frequency of an electric vehicle's inverter to act as a lead controller, synchronizing and managing power flow among distributed energy resources by altering the frequency of the AC potential applied to the power network, ensuring stable power output and distribution.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the grid is disconnected during islanding, then distributed energy resources can operate independently, but power flow control and synchronization become difficult without direct communication between resources
Solution Approach 1:
The EV inverter acts as an intermediary leader that other DERs synchronize to. Instead of requiring direct communication between all DERs, the EV inverter mediates power flow control by adjusting its frequency based on power balance conditions, and other DERs automatically follow this frequency reference, eliminating the need for complex communication infrastructure during islanding mode
Solution Approach 2:
The system uses passive frequency synchronization where DERs automatically adjust to the EV inverter's frequency without active communication. The EV inverter self-regulates its frequency output based on local power balance measurements, and other DERs self-synchronize to this frequency, creating a self-organizing control system that requires no external communication infrastructure
2Productivity
If the EV inverter adjusts frequency to control power flow, then power distribution is optimized, but frequency deviations from nominal may affect connected loads
Solution Approach 1:
The EV inverter dynamically adjusts its frequency output based on real-time power balance conditions between generation and load. When generation exceeds load, frequency increases to reduce DER output; when load exceeds generation, frequency decreases to increase DER output. This dynamic frequency modulation optimizes power distribution while maintaining acceptable power quality for connected loads
Solution Approach 2:
The system changes the frequency parameter of the EV inverter output to control power flow directions and magnitudes. By modulating frequency around the nominal value based on power balance conditions, the system achieves efficient power distribution while keeping frequency deviations within acceptable ranges that maintain power quality for connected loads
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
Facilitates stable and efficient power transfer and distribution among distributed energy resources, maintaining grid stability and reliability by synchronizing frequency and phase, even in the absence of direct communication, thus optimizing power usage and storage.
Implementation Method 1
an inverter configured to be electrically connected between the traction battery and a power network remote from the vehicle
Implementation Method 2
The controller, responsive to a command from a controller remote from the vehicle, alters a frequency at which the inverter applies an AC potential to the power network
Data Source
AI summary
A vehicle controller, responsive to a command from a remote controller, alters a frequency at which a vehicle inverter applies an AC potential to a power network such that an AC power output to the power network by a remote distributed energy resource, such as a solar power system, synchronized with the vehicle inverter decreases.