Modular Braking Adjuster Control for Stable Heat Dissipation
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Solution Overview
Problem
Existing modular braking adjusters lack efficient methods for controlling and converting electrical energy into heat, particularly in modular multilevel current converters, leading to inefficiencies and potential operational instability.
Innovation Solution
A method for generating a square-wave or trapezoidal voltage using submodules, with an alternating component designed to convert time-averaged electrical energy into heat, and a control device for open-loop or closed-loop control of the submodules, allowing precise power conversion and stabilization.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a conventional braking adjuster is used without modular structure, then the device complexity is reduced, but the adaptability to varying voltage levels and operational stability deteriorates
Solution Approach 1:
The braking adjuster is divided into multiple identical submodules that can be connected in series. Each submodule contains the same basic circuit structure with switching elements and capacitors, allowing the system to adapt to different voltage levels by simply adding or removing submodules from the series connection.
2Reliability
If simple control methods are used for the braking adjuster, then the ease of operation is improved, but the operational stability and energy conversion efficiency deteriorate
Solution Approach 1:
The control device generates periodic control signals to switch the submodules on and off in a regular sequence, creating a stable operating pattern. This periodic switching enables reliable energy conversion while maintaining simple control logic through standardized signal generation.
Solution Approach 2:
The control device monitors the operating state of the braking adjuster and adjusts the switching signals accordingly, ensuring stable operation. The feedback mechanism maintains operational stability by automatically compensating for variations in load conditions and energy conversion requirements.
3Manufacturing precision
If electrical energy is converted into heat without controlled voltage generation, then the productivity is improved, but the precision of power conversion and operational reliability deteriorate
Solution Approach 1:
The braking adjuster employs dynamic voltage generation through controlled switching of submodules, allowing the output voltage to vary in a predetermined pattern. This dynamic control enables precise power conversion to meet varying energy dissipation requirements while maintaining high productivity through efficient energy utilization.
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
Enables efficient conversion of electrical energy into heat with controlled power levels, enhancing operational stability and adaptability to varying voltage levels, while reducing wear and increasing reliability and efficiency in energy management systems.
Implementation Method 1
The resistor of a braking adjuster arrangement is often also referred to as a braking resistor because it is suitable for converting electrical energy of an electrical machine into heat
Data Source
AI summary
A modular braking adjuster having at least one submodule and a braking resistor, which are arranged in a series circuit, are operated by generating with the at least one submodule a square-wave or trapezoidal voltage that has an alternating portion dimensioned such that the time-averaged electrical energy absorbed by the modular braking adjuster is converted to heat in the braking resistor. The modular braking adjuster has a control device for controlling or regulating the at least one submodule. Also disclosed is a modular drive unit with a modular multi-level power converter and the aforementioned modular braking adjuster, wherein the modular braking adjuster is electrically connected to a DC voltage side of the modular multi-level power converter.