Inverter Switching Elements for DC Voltage Stabilization
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Solution Overview
Problem
The direct current (DC) distribution system experiences voltage instability during transient periods when loads are connected or removed, leading to inefficiencies and increased production costs due to conventional stabilization devices being separate from the system.
Innovation Solution
A device with a capacitor unit, inverter unit, voltage stabilization unit, and control unit is implemented, using switching elements to convert DC power to AC and stabilize voltage by charging or discharging based on a comparison with a reference range, thereby reducing voltage oscillations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional stabilization devices are used separately from the DC distribution system, then voltage stability can be achieved, but system complexity increases and production cost rises
Solution Approach 1:
The patent combines the voltage stabilization function with the existing inverter device by integrating a voltage stabilization unit into the inverter's switching element structure. The inverter includes three pairs of switching elements, where one pair is dedicated to motor drive and another pair is configured as the voltage stabilization unit. This merging eliminates the need for separate stabilization devices, reducing system complexity while maintaining voltage stability during transient periods when loads are connected or removed.
Solution Approach 2:
The inverter device is designed to perform multiple functions: motor drive control and voltage stabilization. The switching elements in the inverter are configured to serve dual purposes - driving the motor through the inverter unit while simultaneously functioning as a voltage stabilization unit that can charge or discharge the capacitor unit to stabilize DC power supply voltage. This multi-functionality reduces the need for additional dedicated stabilization equipment.
2Reliability
If conventional stabilization devices are used separately from the DC distribution system, then voltage stability can be achieved, but production cost increases
Solution Approach 1:
The patent combines the voltage stabilization function with the existing inverter device by integrating a voltage stabilization unit into the inverter's switching element structure. The inverter includes three pairs of switching elements, where one pair is dedicated to motor drive and another pair is configured as the voltage stabilization unit. This merging eliminates the need for separate stabilization devices, reducing system complexity while maintaining voltage stability during transient periods when loads are connected or removed.
Solution Approach 2:
The inverter device is designed to perform multiple functions: motor drive control and voltage stabilization. The switching elements in the inverter are configured to serve dual purposes - driving the motor through the inverter unit while simultaneously functioning as a voltage stabilization unit that can charge or discharge the capacitor unit to stabilize DC power supply voltage. This multi-functionality reduces the need for additional dedicated stabilization equipment.
3Ease of manufacture
If switching elements are used for both motor drive and voltage stabilization, then production cost is reduced, but device complexity increases
Solution Approach 1:
The inverter's switching elements are segmented into distinct functional groups: one pair of switching elements is dedicated to motor drive control through the inverter unit, while another pair is configured as the voltage stabilization unit. This segmentation allows each subset of switching elements to be optimized for its specific function while sharing the common DC power supply and capacitor unit, managing complexity through functional division.
Solution Approach 2:
The switching elements are configured to dynamically switch between different operational modes. The voltage stabilization unit can charge or discharge the capacitor unit based on the operational state of the DC distribution system, allowing the system to adaptively respond to transient conditions while maintaining efficient motor drive control. This dynamic configuration optimizes performance across different operating scenarios.
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
This solution stabilizes DC power supply, reduces system efficiency degradation, and lowers production costs by utilizing unused switching elements in the inverter for voltage stabilization.
Implementation Method 1
a capacitor unit charged by a DC voltage supplied from the power supply stage
Implementation Method 2
an inverter unit including two pairs of driving switching elements and a pair of common switching elements, wherein the inverter unit is configured to use the two pairs of driving switching elements to convert the voltage charged in the capacitor unit into an AC power
Data Source
AI summary
A device for stabilizing a direct current (DC) distribution system includes a capacitor unit charged by a DC voltage supplied by a power supply stage of the distribution system. The device further includes an inverter that has three pair of switching elements. The device also includes a voltage stabilization circuit constructed using one pair out of the three pairs of switching elements in the inverter. The device also includes a controller that controls the voltage stabilization circuit to alleviate instability of a DC voltage generated in a transient period.