CLC Branch Impedance Matching for Low-Frequency Harmonic Suppression
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Solution Overview
Problem
Conventional impedance matching methods for CLC branches of low-frequency resonance suppression devices are inadequate for high-voltage, large-capacity power supply systems with complex impedance characteristics, limiting their effectiveness in suppressing low-frequency harmonics.
Innovation Solution
An impedance matching method for a CLC branch using an equivalent circuit model, multi-constraint objective optimization function, and an improved harmony search algorithm to determine optimal impedance parameters for effective low-frequency harmonic suppression.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If conventional impedance design method based on reactive power compensation capacity and characteristic harmonic current magnitude is used, then design simplicity is maintained, but impedance parameter cannot match the power supply system with high voltage, large capacity and complex impedance characteristic to implement optimal harmonic suppression
Solution Approach 1:
The patent transforms the impedance parameter determination from a simple formula-based approach to an optimization-based approach. By changing the design methodology from direct calculation to iterative optimization using harmony search algorithm, the system achieves both design automation and optimal parameter matching for complex power supply systems.
Solution Approach 2:
The patent introduces feedback mechanisms through the optimization process. The harmony search algorithm iteratively adjusts impedance parameters based on the objective function that evaluates harmonic suppression performance, creating a feedback loop that continuously improves the matching between the CLC branch impedance and the power supply system characteristics.
2Reliability
If active power filter is used to effectively suppress low-frequency harmonics, then low-frequency harmonic suppression performance is improved, but application in high-voltage and high-capacity system becomes difficult due to voltage level, capacity or economy factors
Solution Approach 1:
The patent replaces the expensive active power filter with a passive CLC branch resonance suppression device. This substitution uses simpler, more economical passive components (inductors and capacitors) configured in a CLC topology, achieving low-frequency harmonic suppression without the high cost and complexity associated with active power filters in high-voltage applications.
Solution Approach 2:
The patent substitutes the electronic control-based active power filter system with a passive resonant circuit system. By replacing the active electronic components and control mechanisms with a passive CLC resonant circuit, the system achieves comparable low-frequency suppression performance with simpler technology suitable for high-voltage, high-capacity applications.
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
The method ensures effective low-frequency harmonic suppression in high-voltage, large-capacity power supply systems with complex impedance characteristics, enhancing harmonic suppression performance.
Implementation Method 1
a series resonance frequency point of the CLC branch coincides with a target low-frequency harmonic frequency point
Data Source
AI summary
An impedance matching method for a CLC branch of a low-frequency resonance suppression device is provided, which includes: establishing an equivalent circuit model for a power supply system with a low-frequency resonance suppression device joined in; obtaining, according to a target low-frequency harmonic frequency band and the equivalent circuit model, a constraint required by the power supply system for suppressing low-frequency harmonics; constructing an objective function based on a low-frequency harmonic suppression rate in a bus of the power supply system; obtaining a multi-constraint objective optimization function of CLC branch impedance based on the constraint and the objective function; and solving the multi-constraint objective optimization function through an improved harmony search algorithm to obtain an impedance parameter of the CLC branch. The present disclosure can ensure a low-frequency harmonic suppression effect for the power supply system.