Inverter Voltage Compensation Using Virtual Modeling
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Solution Overview
Problem
Conventional power converters face challenges in accurately applying desired control voltages to electrical loads due to non-linearities caused by switch intrinsic voltage drops, resistance, and dead-time insertion in PWM control, requiring complex instrumentation for voltage compensation.
Innovation Solution
A control method that involves measuring real voltages, filtering them using electronic and software low-pass filters, and determining correction values using a proportional-integral action corrector to align actual voltages with desired reference voltages, thereby compensating for non-linearities in the inverter module.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If complex instrumentation is used for voltage compensation, then voltage accuracy is improved, but device complexity increases
Solution Approach 1:
The patent creates a virtual model of the inverter module non-linearities through software simulation, copying the behavior of the physical system in a virtual environment. This allows voltage compensation to be achieved through software algorithms rather than complex physical instrumentation, resolving the contradiction between measurement precision and device complexity
Solution Approach 2:
The patent replaces physical measurement and compensation instrumentation with software-based virtual modeling and digital signal processing. The complex mechanical/electrical instrumentation is substituted with computational algorithms that run on standard processing units, achieving voltage accuracy without increasing physical device complexity
2Manufacturing precision
If voltage compensation is implemented, then control accuracy is improved, but device complexity increases
Solution Approach 1:
The inverter module performs its own voltage compensation through embedded software that models its non-linearities and automatically adjusts control signals. This self-service approach eliminates the need for external complex compensation instrumentation, achieving improved control accuracy without increasing overall system complexity
Solution Approach 2:
The patent changes the control parameters dynamically by adjusting PWM duty cycles and switching timing based on virtual model predictions. This software-based parameter adjustment achieves precise voltage control without adding complex hardware components, resolving the contradiction between control accuracy and system complexity
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 method simplifies and cost-reduces voltage compensation, ensuring that actual voltages applied to the electrical load match desired voltages by effectively addressing the non-linearities in the inverter module, improving control accuracy and efficiency.
Implementation Method 1
a first step of filtering a voltage representative of the real voltage applied to the electrical load so as to obtain a first filtered voltage
Implementation Method 2
a second step of filtering a voltage representative of the reference control voltage so as to obtain a second filtered voltage
Data Source
AI summary
A control method to be implemented in a power converter, the power converter including an inverter module controlled by a control rule that makes it possible to determine a control voltage to be applied to an electrical load on the basis of a reference control voltage. The control method includes determining a correction value to be applied to the reference control voltage, the correction value being determined from a first filtered voltage obtained by filtering a voltage that is representative of the real measured voltage, and a second filtered voltage obtained by filtering a voltage that is representative of the reference control voltage.