Parallel DC Power Sharing Control via Voltage Reference Adjustment
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Solution Overview
Problem
High voltage and high current electrical systems in hybrid-electric and all-electric aircraft require efficient energy and power management, particularly in systems with parallel connected DC voltage sources, where existing technologies struggle to optimize power sharing among multiple sources.
Innovation Solution
A control scheme that determines the operating parameters of each DC power system, assigns a percentage of power to each system, and supplies a reference voltage to ensure each system produces its assigned share of power, using a common DC bus and controllers to regulate the voltage and current distribution.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If multiple DC power systems are connected in parallel to power an electrical load, then the total power supply capacity is increased, but the power sharing among the parallel systems becomes difficult to control and optimize
Solution Approach 1:
The patent changes the voltage parameter of each DC power system dynamically to control power sharing. Each controller adjusts its respective DC power system's voltage based on the total power demand and assigned power share percentage, thereby controlling the power contribution of each system without complex communication protocols
Solution Approach 2:
The patent implements a feedback mechanism where each controller continuously monitors the operating parameters of parallel DC power systems, calculates the required power sharing based on assigned percentages, and adjusts the voltage references accordingly to maintain optimal power distribution among the parallel systems
2Loss of energy
If the voltage level is increased to improve power transmission efficiency, then the energy loss is reduced, but the safety and insulation requirements become more stringent
Solution Approach 1:
The patent segments the high voltage system into multiple parallel DC power systems operating at controlled voltage levels. By dividing the total power requirement across multiple independent systems, each operating at optimized voltage and current levels, the system achieves high efficiency while maintaining safety through modular architecture and distributed control
Data Source
AI summary
A control scheme for controlling power sharing among a plurality of parallel connected DC voltage sources is disclosed. Each of the DC voltage sources in parallel connection is an independent DC power system, which can be an suitable DC power supply that can provide power to a load. By way of example, the present disclosure describes a DC power system that includes a power source, an energy storage unit and a triple active bridge converter that provides power to the common load. Each independent DC power system has its own controller that shares a DC bus with the other DC power system controllers. Each controller executes non-transitory instructions to provide a reference voltage V* to its respective independent DC power system and implements a control scheme that changes the voltage reference to ensure that each independent DC power system only provides a certain share of the load current/power.