Hybrid Passive Power Filter for High-Voltage Harmonic Suppression
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Solution Overview
Problem
Existing power filters, both passive and active, are inadequate in suppressing harmonics in large power grids and high-voltage systems, with passive filters failing to filter out higher harmonics effectively and active filters being costly and unreliable.
Innovation Solution
A hybrid passive power filter comprising a series passive harmonic isolation unit and a parallel passive filtering unit, including third-order and fifth-order passive filtering branches, which isolate and filter out harmonics without a control system, enhancing reliability and accessibility to high-voltage systems.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If passive power filters are used to suppress harmonics, then the cost is reduced and the structure is simplified, but they cannot filter out higher harmonics effectively and cannot suppress background harmonics of large power grids
Solution Approach 1:
The power filter is segmented into multiple functional modules: a parallel passive filtering unit with third-order and fifth-order filtering branches for targeting specific harmonic frequencies, and a series passive harmonic isolation unit for isolating background harmonics. Each module addresses specific harmonic ranges, collectively achieving comprehensive suppression across multiple frequency bands while maintaining passive component simplicity.
2Reliability
If active power filters are used to suppress harmonics, then the harmonic suppression effectiveness is improved, but the cost increases, the reliability decreases, and they cannot be directly applied to high-voltage systems
Solution Approach 1:
The patent replaces the active control system (electronic control, switching devices, sensors) with a passive mechanical/electrical resonance-based filtering system. The third-order and fifth-order passive filtering branches use LC resonance circuits that naturally attenuate specific harmonic frequencies without requiring active control electronics, thereby eliminating the complexity associated with active filter control systems while maintaining harmonic suppression effectiveness.
3Ease of manufacture
If traditional passive filters are used, then the cost is reduced, but they cannot suppress background harmonics of large power grids or systems for new energy access
Solution Approach 1:
The power filter design incorporates multi-functional capabilities: the parallel passive filtering unit with multiple-order branches provides targeted harmonic filtering for specific frequency components, while the series passive harmonic isolation unit addresses background harmonics across broader frequency ranges. This multi-functional architecture enables the same filter structure to effectively handle harmonics in traditional power grids, new energy access systems, and high-voltage applications, enhancing universality without increasing cost.
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 hybrid filter effectively isolates and filters harmonics in power grids, improving reliability and enabling efficient harmonic suppression in both high-voltage and low-voltage systems, while reducing the complexity and cost associated with active filters.
Implementation Method 1
the series passive harmonic isolation unit is configured to isolate harmonics
Implementation Method 2
the parallel passive filtering unit includes a third-order passive filtering branch and a fifth-order passive filtering branch
Data Source
AI summary
Provided are hybrid passive power filter and a three-phase power system. The hybrid passive power filter includes: a series passive harmonic isolation unit, a parallel passive filtering unit, and a harmonic load; the series passive harmonic isolation unit has an input terminal electrically connected to a power grid and an output terminal electrically connected to a first terminal of the harmonic load, and the series passive harmonic isolation unit is configured to isolate harmonics; and the parallel passive filtering unit has an input terminal electrically connected to the output terminal of the series passive harmonic isolation unit and an output terminal electrically connected to a second terminal of the harmonic load, and the parallel passive filtering unit is configured to filter out harmonics.