Power Regeneration Phase Correction for AC Reactor Disturbances
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Solution Overview
Problem
Power regeneration systems face challenges in maintaining phase synchronization with AC power supplies over long distances due to reactance components in the wiring, leading to low-frequency disturbances and phase detection errors.
Innovation Solution
The power regeneration apparatus includes a phase correction section within the drive control unit that corrects phase detection values based on reactive current components, suppressing low-frequency disturbances without the need for damping resistors or adjusting current regulator gains, by using a phase correction section that adjusts the phase detection value detected by the phase detecting unit.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Length of stationary object
If power regeneration is performed over long distances with AC reactors, then power can be supplied to remote locations, but low-frequency disturbances occur due to reactance components causing phase detection errors
Solution Approach 1:
The system detects the reactive current component flowing through the AC reactor and uses this feedback to calculate and correct the phase detection error. The correction amount is determined based on the detected reactive current, creating a closed-loop feedback mechanism that compensates for phase detection inaccuracies caused by long-distance transmission reactance.
Solution Approach 2:
The system dynamically adjusts the phase detection value by adding a correction amount that is calculated from the reactive current component. This parameter change compensates for the phase shift introduced by the AC reactor's reactance, allowing accurate phase detection despite long transmission distances.
2Reliability
If damping resistors or current regulator gain adjustments are used to suppress low-frequency disturbances, then phase synchronization can be maintained, but device complexity and energy loss increase
Solution Approach 1:
The system replaces physical damping resistors and mechanical adjustment mechanisms with a computational approach. By detecting the reactive current component and calculating the appropriate phase correction, the system achieves disturbance suppression through software-based control rather than additional hardware components or complex mechanical adjustments.
Solution Approach 2:
The reactive current component detection serves as an intermediary measurement that enables indirect control of phase synchronization. Instead of directly manipulating phase angles or adding damping elements, the system uses reactive current detection as an intermediate step to calculate and apply the necessary phase correction.
3Measurement precision
If damping resistors are added to suppress low-frequency disturbances, then phase detection accuracy improves, but energy loss increases
Solution Approach 1:
The system replaces energy-dissipating damping resistors with a computational correction method. By detecting reactive current and calculating phase correction amounts, the system achieves accurate phase detection without the energy losses inherent in resistive damping solutions.
Data Source
AI summary
A power regeneration apparatus includes a power conversion unit, an AC reactor, a voltage detecting unit, a phase detecting unit, a drive control unit for controlling the power conversion unit based on a phase detection value, and a reactive current component detecting unit. The phase detecting unit detects the phase of the AC power supply. The reactive current component detecting unit detects a reactive current component of a current. The drive control unit includes a phase correction section. The phase correction section corrects the phase detection value based on the reactive current component.