Matrix Converter Current Control Mode Voltage Boosting
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Solution Overview
Problem
Traditional matrix converters operating in voltage control mode are limited in output voltage capability, unable to provide voltages greater than 86.6% of the input voltage without distortion due to the presence of input line-to-line capacitors, which restricts their ability to create short circuits and limits their operational safety and efficiency.
Innovation Solution
A matrix converter system operating in current control mode, which eliminates the need for input inductor-capacitor circuits by using internal inductances of a multiphase generator to generate reactive currents, allowing for the creation of output voltages greater than the input voltage through energy storage and charging of output capacitors, thereby overcoming the 86.6% voltage limit.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If input inductor-capacitor circuits are implemented in voltage control mode, then the matrix converter can operate with stable voltage control, but the output voltage is limited to maximum 86.6% of input voltage without distortion
Solution Approach 1:
The patent changes the control parameter from voltage control mode to current control mode. By controlling the input current instead of output voltage directly, the system can generate output voltages greater than the input voltage without distortion, overcoming the 86.6% limitation while maintaining stable operation through the generator's internal inductances
Solution Approach 2:
The patent removes the input inductor-capacitor circuits from the system. By eliminating these external filtering components and utilizing the generator's internal inductances instead, the system achieves both voltage boosting capability and stable operation without the restrictive 86.6% voltage limit
2Reliability
If input inductor-capacitor circuits are used, then voltage control is stable, but the converter size and weight increase
Solution Approach 1:
The patent extracts and removes the heavy input inductor-capacitor circuits from the system. By utilizing the generator's internal inductances for current control, the system achieves voltage control stability without requiring external filtering components, thereby reducing overall converter weight and size
Solution Approach 2:
The patent merges the filtering function into the generator itself by utilizing its internal inductances. This integration eliminates the need for separate external inductor-capacitor circuits, reducing component count and overall system weight while maintaining stable operation
3Reliability
If input inductor-capacitor circuits are implemented, then voltage control is stable, but the device complexity increases
Solution Approach 1:
The patent removes the complex input inductor-capacitor circuitry and replaces it with a simplified current control scheme that leverages the generator's inherent internal inductances. This extraction of unnecessary external components reduces device complexity while maintaining control stability
Solution Approach 2:
The patent enables the generator to serve its own filtering and stabilization function through its internal inductances. By using the generator's own characteristics for current control, the system eliminates the need for external filtering components, thereby reducing overall device complexity
4Reliability
If the matrix converter operates in voltage control mode with input capacitors, then it can provide stable output, but it cannot safely create short circuits between input phase lines
Solution Approach 1:
The patent changes the control parameter from voltage to current, which fundamentally alters the safety characteristics. In current control mode, the generator's internal inductances naturally limit short-circuit currents, enabling safe operation during short circuits between input phase lines while maintaining stable output
Solution Approach 2:
The patent removes the input capacitors that create low-impedance paths and potential safety hazards. By eliminating these capacitors and using current control with the generator's internal inductances, the system achieves both output stability and operational safety during fault conditions
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 safe and efficient operation beyond the traditional 86.6% voltage limit, allowing for higher output voltages without distortion, and reduces the size and weight of the converter by eliminating the need for input LC circuits.
Implementation Method 1
A generator is connected to the multiphase voltage source input, wherein the generator includes internal inductances. A controller having a pulse width modulation (PWM) control circuit is configured to control the plurality of switches to generate energy within the internal inductances of the generator.
Data Source
AI summary
A matrix converter system having a current control mode operation is provided. The matrix converter system includes a matrix converter that includes a plurality of switches. A unity current reference vector having an amplitude of one is determined that defines an angle and frequency of an output current vector as a function of a reference phase angle, which is a function of the output current vector and an output voltage vector representing feedback signals of a multiphase signal output to a load. The unity current reference vector is used to control the matrix converter, to cause the output current vector to be aligned with the unity current reference vector. A unity voltage reference vector having an amplitude of one is provided that defines a reference angle and frequency as a function of a zero phase angle. The output voltage vector and the unity voltage reference vector are aligned to determine the reference phase angle as an angle between the aligned output voltage vector and the output current vector.