Power Converter Current Control via Voltage Oscillation
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Solution Overview
Problem
Existing power converting devices struggle to accurately control output currents during system voltage abnormalities, such as line-to-line short circuits, which can lead to unbalanced voltages and potential overcurrents, due to the inability to effectively manage oscillation components of voltage amplitudes.
Innovation Solution
A power converting device equipped with voltage amplitude determination circuitry and control circuitry that utilizes the oscillation component of the voltage amplitude to accurately control output currents, incorporating a corrector that adjusts current commands based on the oscillation component to maintain stable operation during voltage abnormalities.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If conventional current control methods are used during voltage abnormalities, then the control system remains simple, but output current accuracy deteriorates due to inability to manage oscillation components
Solution Approach 1:
The patent applies preliminary action by detecting voltage amplitude oscillation components before they cause harmful effects. The control circuitry identifies oscillation components in advance and preemptively adjusts output current commands to counteract their impact, preventing current inaccuracies before they occur during voltage abnormalities.
Solution Approach 2:
The patent implements feedback by continuously monitoring voltage amplitude oscillation components and using this information to dynamically adjust output current control commands. The control system measures oscillation components, processes this feedback information, and modifies current commands accordingly to maintain accurate current control despite voltage fluctuations.
2Reliability
If voltage amplitude oscillation components are utilized for current control, then overcurrents are restricted and power quality is maintained, but the control algorithm becomes more complex
Solution Approach 1:
The patent introduces an intermediary approach by using voltage amplitude oscillation components as a mediating parameter between voltage abnormalities and current control. Instead of directly responding to voltage drops or abnormalities, the system uses oscillation components as an intermediate signal to smoothly adjust current commands, maintaining stability without requiring complex emergency response logic.
Solution Approach 2:
The patent applies parameter changes by dynamically adjusting current control parameters based on detected voltage amplitude oscillation characteristics. The control algorithm modifies current command parameters in response to changing oscillation conditions, enabling adaptive current control that maintains reliability under varying voltage abnormality conditions.
3Measurement precision
If phase information holding method is used during voltage drops, then simple control is maintained, but current control accuracy deteriorates due to unbalanced voltage conditions
Solution Approach 1:
The patent applies dynamics by transitioning from static phase information holding to dynamic oscillation-based control. Instead of relying on pre-stored phase information that becomes invalid during unbalanced conditions, the system continuously adapts current control commands based on real-time oscillation component detection, enabling dynamic adjustment to changing unbalanced voltage conditions.
Solution Approach 2:
The patent uses preliminary action by detecting oscillation components that precede severe unbalanced conditions. By identifying oscillation patterns early, the system can preemptively adjust current commands to compensate for upcoming unbalanced voltage conditions, maintaining accuracy before full unbalance occurs.
Data Source
AI summary
A power converting device includes power conversion circuitry connected to a power system, voltage amplitude determination circuitry that determines a voltage amplitude of the power system, and control circuitry that controls an output current from the power conversion circuitry to the power system based on an oscillation component of the voltage amplitude determined by the voltage amplitude determination circuitry.