Phase-Compensated Harmonic Regulation for Single-Cycle Voltage Stabilization
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Solution Overview
Problem
Conventional voltage regulators have a slow voltage transient response, making them unsuitable for applications requiring rapid voltage stabilization, such as uninterruptible power supplies and microgrids.
Innovation Solution
A voltage controller using a single-loop control system with a phase-compensated harmonic regulator that stabilizes instantaneous voltage into a steady-state voltage within a single cycle, capable of regulating voltage harmonics and phase compensation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If conventional voltage regulators are used, then voltage regulation is achieved, but voltage transient response is slow (0.5-1 second)
Solution Approach 1:
The patent replaces electromechanical voltage regulation mechanisms with an electronic control system using power electronic switches (IGBTs, MOSFETs) and a single-loop control algorithm operating in a stationary reference frame. This substitution eliminates the inherent mechanical inertia and slow response of traditional regulators, achieving sub-transient voltage stabilization within a single cycle (0.0167 seconds at 60Hz) by using electronic switching and digital signal processing instead of mechanical adjustment.
2Device complexity
If conventional multi-loop control systems are used, then comprehensive control is achieved, but system complexity increases
Solution Approach 1:
The patent merges multiple control functions (voltage regulation, harmonic compensation, phase correction, transient response control) into a single unified control loop operating in a stationary reference frame. Instead of using separate proportional-integral (PI) controllers for different functions, the invention implements one comprehensive control algorithm that simultaneously handles all control objectives, thereby reducing the number of control loops, simplifying system architecture, and improving real-time performance.
Solution Approach 2:
The single-loop control system is designed to perform multiple functions simultaneously: it provides voltage regulation, compensates for harmonics, corrects phase shifts, and responds to transient conditions all within one control framework. This multi-functional approach eliminates the need for separate specialized controllers, reducing overall system complexity while maintaining comprehensive control capability.
3Object-generated harmful factors
If voltage harmonics are present, then power quality deteriorates, but filtering harmonics increases system complexity
Solution Approach 1:
The patent replaces traditional passive harmonic filtering circuits (which use large inductors and capacitors) with an active harmonic compensation mechanism implemented through the single-loop control system. The controller dynamically adjusts power electronic switches to generate compensating currents that cancel out harmonic components, achieving harmonic mitigation without requiring complex passive filter networks.
Solution Approach 2:
The system uses real-time feedback from voltage sensors to detect harmonic components and feeds this information back to the single-loop controller, which then adjusts the switching commands to power electronic devices to actively compensate for harmonics. This closed-loop feedback mechanism provides dynamic harmonic cancellation without requiring predetermined filter designs.
Data Source
AI summary
A voltage controller detects a voltage spike in an electrical signal received from an electrical power source. The voltage controller is implemented using a single-loop control system in a stationary reference frame. The electrical signal includes voltage harmonics caused by a non-linear or unbalanced load. The voltage controller includes a phase-compensated harmonic regulator that regulates the voltage harmonics present in the electrical signal and receives a feedback voltage of the single-loop control system. The feedback voltage is a delayed version of an instantaneous voltage of the electrical signal. The instantaneous voltage is sub-transiently stabilized into a steady-state voltage based on the feedback voltage. Sub-transiently stabilizing the instantaneous voltage is performed within a single cycle after the voltage spike is detected. The steady-state voltage has a total harmonic distortion less than a threshold total harmonic distortion and the steady-state voltage has a balanced sinusoidal waveform.