Converter Switch Voltage Pulse for Connection Set Parameter Determination
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Solution Overview
Problem
Existing methods for determining characteristic parameters of a connection set between a converter and an electric machine are cumbersome and do not account for changes due to aging or system modifications, such as capacitance degradation and cable length variations.
Innovation Solution
An electronic determination device that uses converter switches to generate a voltage pulse through the connection set, measuring currents and voltages to calculate characteristic parameters like impedance, propagation time, capacitance, and resonance frequency, allowing for real-time and convenient parameter determination.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of time
If beforehand determination of characteristic parameters is performed using manufacturing data or initial measurements, then the determination process is simple and quick, but the accuracy deteriorates due to aging and system modifications
Solution Approach 1:
The patent performs preliminary determination of characteristic parameters during the commissioning phase using TDR measurements and initial impedance analysis. This preliminary action establishes baseline values that are later used for comparison during online monitoring, combining the speed of preliminary measurement with the accuracy of ongoing updates.
Solution Approach 2:
The patent implements continuous online monitoring that compares current characteristic parameters against reference values established during commissioning. When deviations exceed thresholds, the system triggers alerts or automatic adjustments, creating a feedback loop that maintains accuracy without requiring continuous full-scale measurements.
2Measurement precision
If impedance analyzer and TDR device are used to determine characteristic parameters, then the measurement accuracy is improved, but the device complexity and operational burden increase
Solution Approach 1:
The patent integrates multiple measurement functions into the existing converter control unit. The same control unit that manages the converter switches also performs TDR measurements, impedance analysis, and parameter determination, eliminating the need for separate dedicated measurement devices and reducing overall system complexity.
Solution Approach 2:
The patent combines the measurement and control functions into a single integrated system. The control unit serves dual purposes: controlling the converter operation and performing all characteristic parameter measurements, thereby merging what would traditionally be separate devices into one unified system.
3Ease of operation
If converter switches are used to generate voltage pulses for parameter determination, then the ease of operation is improved by using existing components, but the reliability may be affected by additional switching operations
Solution Approach 1:
The patent makes the converter switches serve dual functions: their primary role in power conversion and their secondary role in generating test pulses for parameter measurement. By using existing components for measurement purposes, the system achieves self-service capability without adding external test equipment, while the measurement operations are performed during idle or low-load periods to minimize impact on reliability.
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 easier and more accurate determination of connection set parameters, accounting for changes over time and system modifications, improving the efficiency and reliability of the power supply chain.
Implementation Method 1
controlling the converter switches (36) of the converter (14) in an appropriate manner, in order to generate a voltage pulse (54) through the connection set (18)
Implementation Method 2
measuring respective current(s) and voltage(s) through the filter (38), further to the generation of the voltage pulse (54)
Data Source
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AI summary
An electronic determination device (20) for determining at least one characteristic parameter of a connection set (18) connected between a converter (14) and an electric machine (12); the converter comprising at least two output terminals (26) and, for each output terminal, a switching branch (28) including at least one converter switch (36); the connection set comprising a filter (38) connected to the output terminals and a cable (40) connected between the filter and the electric machine; the filter including, for each output terminal, a respective electromagnetic coil (44) connected to said output terminal and a respective capacitor (46) connected to said coil; the determination device (20) comprising: - for each output terminal, a device switch (50) configured to be connected to the respective capacitor; - a generation module (52) configured to generate a voltage pulse (54) through the connection set, by controlling the converter switches and each device switch; - an acquisition module (56) configured to acquire measurements of respective current(s) and voltage(s) through the filter, further to the generation of the respective voltage pulse; and - a calculation module (58) configured to calculate at least one characteristic parameter of the connection set according to the respective current(s) and voltage(s) measurements.