DC Stabilization Power Supply System for Aircraft
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Solution Overview
Problem
Conventional DC power supply systems for aircraft face challenges in stabilizing voltage fluctuations, leading to increased size and weight of power supply devices and converters, particularly in low-temperature environments and idle engine states, where charging characteristics of electrical accumulators degrade and generators struggle to absorb regenerative power effectively.
Innovation Solution
A direct current (DC) stabilization power supply system comprising two DC power supply sections and a power conversion section that bidirectionally converts AC and DC power, allowing for dynamic adjustment of power stabilization operations based on voltage changes in the DC bus, using a PWM converter and a boost converter to share and manage power fluctuations without increasing device size.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the capacity of the electrical accumulator is increased to absorb regenerative power or temporary electric power increase, then the power supply stability is improved, but the size and weight of the power supply device increases
Solution Approach 1:
The patent divides the power supply system into two independent sections: a first DC power supply section including the AC power supply and power conversion section, and a second DC power supply section including the DC power supply and charging/discharging control section. Each section can independently perform power supply stabilization operations, allowing the system to handle power fluctuations without requiring a single oversized accumulator or generator.
Solution Approach 2:
The patent implements dynamic control where the power conversion section adjusts the target voltage value of the DC bus based on detected voltage changes. The charging/discharging control section dynamically controls the charging and discharging amounts of the DC power supply based on the voltage target value. This dynamic adjustment allows the system to respond flexibly to power fluctuations without requiring excessive capacity in the power supply devices.
2Power
If the size of the converter is increased to handle larger power supply device capacity, then the power absorption capability is improved, but the device complexity and size increase
Solution Approach 1:
The patent segments the power conversion function across two independent sections. The power conversion section in the first DC power supply section handles AC-DC conversion and voltage regulation, while the charging/discharging control section in the second DC power supply section handles battery charge/discharge control. This segmentation allows each converter to be smaller and less complex while collectively handling the full range of power fluctuations.
Solution Approach 2:
The patent implements partial action by having each power supply section handle only the power fluctuations it needs to manage. The power conversion section handles AC power conversion and initial voltage regulation, while the charging/discharging control section handles excess or deficit power by charging or discharging the DC power supply. This partial division of labor reduces the burden on each individual converter.
3Reliability
If the electrical accumulator is used in low-temperature environment, then the power supply stability is maintained, but the charging characteristics are degraded
Solution Approach 1:
The patent implements dynamic control where the charging/discharging control section adjusts the charging and discharging amounts of the DC power supply based on the detected voltage changes and the voltage target value set by the power conversion section. This dynamic adjustment allows the system to adapt to low-temperature conditions by modulating the charging rate to match the degraded charging characteristics, thereby maintaining power supply stability without requiring the accumulator to operate at its full theoretical capacity.
4Reliability
If the generator size is increased to absorb regenerative power during idle engine state, then the power supply stability is improved, but the device size and weight increase
Solution Approach 1:
The patent divides the power supply function into two independent sections, allowing the DC power supply (such as a battery or capacitor bank) in the second section to handle regenerative power absorption during idle engine states. This segmentation eliminates the need to oversized the generator for regenerative braking capability, as the DC power supply section can independently absorb regenerative power from electric actuators.
Solution Approach 2:
The DC power supply in the second DC power supply section serves multiple functions: it provides auxiliary power when the AC power supply is insufficient, absorbs regenerative power from electric actuators during idle engine states, and maintains voltage stability. This multi-functionality eliminates the need for a larger generator and reduces overall system weight.
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
The system effectively absorbs power changes without enlarging power supply devices or converters, maintaining power quality and reducing aircraft weight, while efficiently utilizing electric energy by adapting to varying conditions such as low temperatures and engine states.
Implementation Method 1
a power conversion section (20) which is connected to the charging/discharging control section (30), the alternating current power supply (42), and the direct current bus (14), and bidirectionally converts alternating current power and direct current power
Data Source
AI summary
A first DC power supply section of a DC stabilization power supply system includes at least a generator and a PWM converter. A second DC power supply section of the DC stabilization power supply system includes at least a battery and a boost converter. Each of these DC power supply sections performs a power supply stabilization operation for supplying DC power to an electric system and absorbing regenerative power generated from an actuator or the like. A PWM converter controls adjustment of the amount of the power supply stabilization operation to be performed by the DC power supply section and the amount of the power stabilization operation to be performed by the DC power supply section, by changing a target voltage value of a DC bus.