Harmonic Regulator Loop Delay Compensation
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Solution Overview
Problem
Existing methods for reducing voltage waveform distortion in power systems, particularly caused by non-linear loads, often require increasing the electrical power source rating, leading to larger and heavier power sources, and struggle with stability issues due to loop transfer function delays.
Innovation Solution
Implementing a harmonic regulator with loop delay compensation, which includes a controller coupled to the power system and a delay component that adds delay to the power system, allowing for the reduction of harmonic distortion at frequencies that could not be controlled otherwise, by modifying the controller to include time delays inserted before or after the harmonic regulator to achieve stability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If the electrical power source rating is increased to reduce voltage waveform distortion, then the voltage distortion is reduced, but the power source becomes larger and heavier
Solution Approach 1:
The patent changes the electrical parameters of the power source, specifically reducing the voltage rating from a higher value to 208V line-to-line, while using power electronics (IGBTs, diodes, capacitors) to generate clean sinusoidal voltage waveforms. This parameter change allows the power source to deliver high-quality power without requiring increased physical size or weight.
2Manufacturing precision
If a harmonic regulator is applied to remove distortion from power, then voltage waveform distortion is reduced, but system stability deteriorates due to loop transfer function delays
Solution Approach 1:
The patent implements a feedback control system where the output voltage is monitored and fed back to the controller. The controller uses this feedback information to adjust the PWM switching signals, enabling the system to maintain stability while correcting harmonic distortions. The feedback loop allows real-time compensation without the instability issues mentioned in the contradiction.
Solution Approach 2:
The patent employs dynamic control through PWM (pulse width modulation) switching of power electronic devices. The switching frequency and duty cycle are dynamically adjusted based on the feedback signal to maintain system stability while eliminating harmonics. This dynamic adjustment allows the system to respond to changing load conditions without becoming unstable.
Data Source
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AI summary
Embodiments of the invention provide for a system, method, and controller for operating a harmonic regulator with loop delay compensation. Some embodiments include receiving, at a controller, voltage feedback from a power system, and applying a harmonic regulator to each distortion frequency to be compensated. Embodiments also include applying a predetermined delay to an output of the harmonic regulator, scaling the delayed output and adding it to a power source voltage reference waveform, and providing condition power to a load, using the conditioned power source voltage reference waveform.