Active Filter for Harmonic Distortion on Lower Power Bus
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Solution Overview
Problem
High voltage power distribution buses often introduce harmonic distortion currents that are transferred to lower voltage buses, causing noise and inappropriateness for electrical components, leading to the need for a cost-effective solution to monitor, filter, and clean up these distortions.
Innovation Solution
A local solution involving an active filter on the lower power electrical bus senses deviations from a sinusoidal waveform, generates correction currents, and filters these currents to attenuate them, preventing them from propagating back to the higher power bus, using lower power components that are less expensive and efficient.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If a global solution is used to reduce harmonic distortion on the higher power bus, then the harmonic distortion is reduced system-wide, but the cost increases significantly
Solution Approach 1:
The patent applies local quality by implementing the harmonic distortion reduction solution specifically on the lower power bus where the distortion affects electrical components, rather than applying a global solution to the entire higher power bus system. This localized approach reduces costs while still achieving the desired reduction in harmonic distortion where it is most problematic.
Solution Approach 2:
The patent segments the electrical distribution system into higher power bus and lower power bus sections, and applies the harmonic distortion reduction solution only to the lower power bus segment. This segmentation allows for a more cost-effective solution that addresses the problem where it occurs without unnecessarily treating the entire system.
2Device complexity
If an active filter is installed on the lower power bus to reduce harmonic distortion, then the cost is reduced compared to global solutions, but the correction current must be prevented from propagating back to the higher power bus
Solution Approach 1:
The patent uses a transformer as an intermediary between the lower power bus and higher power bus. The transformer provides electrical isolation that prevents the correction current generated by the active filter on the lower power bus from propagating back to the higher power bus, while still allowing the active filter to effectively reduce harmonic distortion on the lower power bus.
3Productivity
If harmonic distortion currents are allowed to propagate through the step down transformer, then the higher voltage bus operates normally, but the noisy voltage becomes inappropriate for electrical components on the lower voltage bus
Solution Approach 1:
The patent extracts the harmonic distortion problem from the higher power bus by implementing the active filter solution on the lower power bus. This removes the harmful harmonic distortion currents from affecting electrical components on the lower voltage bus, while allowing the higher voltage bus to continue operating normally without interference.
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
This approach effectively reduces harmonic distortion on the lower power bus, saving costs by a factor of ten compared to global solutions, while ensuring clean power supply to connected devices without affecting the higher voltage bus.
Implementation Method 1
generating a correction current to adjust the deviation in the voltage on the lower power bus to a substantially sinusoidal voltage waveform
Implementation Method 2
filtering the correction current to substantially attenuate the correction current from propagating through the filter from the lower power electrical bus to the higher power electrical bus
Data Source
AI summary
A computer program product and system are disclosed including but not limited to supplying a voltage waveform from a higher power electrical bus to a lower power electrical bus; sensing on the lower power electrical bus, a deviation from a sinusoidal voltage waveform in the voltage waveform supplied from the higher power electrical bus; generating a correction current to adjust the deviation in the voltage on the lower power bus to a substantially sinusoidal voltage waveform; and filtering the correction current to substantially attenuate the correction current from propagating through the filter from the lower power electrical bus to the higher power electrical bus.