Shared Subcircuit for Capacitor Harmonic Resonance Mitigation
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing systems with multiple switchable shunt capacitors require individual detuning, damping, or filtering elements for each capacitor, leading to increased cost and space requirements for mitigating harmonic resonance, which is inefficient.
Innovation Solution
A shared detuning, damping, or filtering subcircuit is designed to provide adequate mitigation for all possible on/off combinations of multiple switchable capacitors, reducing the need for separate elements and minimizing costs and space requirements.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If individual detuning, damping, or filtering elements are added to each shunt capacitor, then harmonic resonance mitigation is improved, but cost and space requirements increase
Solution Approach 1:
The patent combines multiple individual resonance mitigation elements into a single shared subcircuit that serves multiple capacitors simultaneously. This shared subcircuit includes reactive components (inductors and capacitors) configured to provide detuning, damping, or filtering functions for all capacitors in the system, thereby reducing the total number of components needed and lowering both cost and space requirements while maintaining effective harmonic resonance mitigation.
Solution Approach 2:
The shared subcircuit is designed to perform multiple functions: it provides resonance mitigation for multiple different capacitors with different capacitance values, handles various harmonic frequencies, and can operate effectively regardless of which specific capacitors are connected or disconnected from the system. This universal design allows one subcircuit to replace what would traditionally require multiple separate mitigation elements.
2Adaptability or versatility
If multiple switchable capacitors are used for variable reactive power compensation, then adaptability to system conditions is improved, but the number of resonance mitigation elements required increases
Solution Approach 1:
The patent merges the resonance mitigation functions for multiple switchable capacitors into a single shared subcircuit. This subcircuit is configured with reactive components that can effectively mitigate harmonics and resonance for any combination of capacitors that may be connected or disconnected, thus maintaining adaptability while reducing the quantity of mitigation elements from multiple individual components to one shared structure.
Solution Approach 2:
The shared subcircuit is designed with universal characteristics that allow it to serve multiple capacitors with different capacitance values and power ratings. The subcircuit's reactive components are sized and configured to provide effective resonance mitigation across the full range of possible capacitor combinations, making the system adaptable to varying reactive power needs without requiring separate mitigation elements for each capacitor.
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 shared subcircuit effectively mitigates resonance and harmonic filtering across all capacitor combinations, reducing costs and space needs by up to one-third and half compared to traditional methods, while maintaining adequate performance.
Implementation Method 1
Resonance occurs when a component's capacitive impedance is approximately equal to the system's inductive impedance at a particular frequency (e.g. 300 Hz). If the system has a current or voltage source at 300 Hz, resonance can occur.
Implementation Method 2
The damping element's resistive component can damp the magnitude of resonance.
Data Source
AI summary
Systems and devices that provide a shared detuning, damping, or filtering element to one or more capacitors. A number of circuit branches are coupled in parallel to each other between a first coupling point and a second coupling point. A subcircuit is coupled between the second coupling point and a third coupling point. Each branch includes at least one capacitor that provides reactive power to power systems while the subcircuit is configured to provide detuning, damping, or filtering to the multiple branches.