Inverter Burst Current Waveform Modification for Grid Noise Reduction
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Solution Overview
Problem
Inverters coupled to solar PV modules face efficiency issues during low power periods, leading to abrupt power transfers on multi-phase AC lines, causing stress and unwanted effects like noise and flicker on the grid.
Innovation Solution
A power conversion module with a waveform modification module that generates a modified AC current, ensuring each phase has a value of zero at the beginning of the AC line cycle, smoothing the burst current waveform and reducing stress on the grid.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If the inverter stores energy and then bursts it to the commercial power grid during low power periods, then inverter efficiency is improved, but abrupt power transfer causes stress on inverter components and unwanted effects on the grid
Solution Approach 1:
The patent applies preliminary action by pre-modifying the burst current waveform before it is transferred to the grid. The waveform modification module prepares the current in advance to ensure it starts at zero and follows a smooth trajectory, preventing abrupt power transfer and its harmful effects on both the inverter components and the grid during low power periods
Solution Approach 2:
The patent applies preliminary anti-action by using the waveform modification module to counteract the potential harmful effects of abrupt power transfer before it occurs. By shaping the burst current waveform in advance to start at zero and increase smoothly, the system prevents stress on inverter components and unwanted grid effects such as noise, transient distortion, and flicker
2Power
If the inverter transfers power abruptly from no power output to generating power at different levels for various phases, then power delivery is achieved, but noise, transient distortion, and flicker are generated on the grid
Solution Approach 1:
The patent applies preliminary action by pre-shaping the burst current waveform using the waveform modification module before power transfer occurs. The module ensures each phase of the burst current starts at zero and increases smoothly to its target level, enabling effective power delivery while preventing the generation of noise, transient distortion, and flicker on the grid
Solution Approach 2:
The patent applies parameter changes by dynamically adjusting the waveform parameters of the burst current through the waveform modification module. By controlling the shape, amplitude, and phase of the current waveform to start at zero and transition smoothly, the system achieves effective power delivery while eliminating harmful effects such as noise, transient distortion, and flicker
Data Source
AI summary
A method and apparatus for power conversion. In one embodiment, an apparatus includes a power conversion module for converting a first current to a second current, where the first current or the second current is an AC current having at least two phases. The apparatus also includes a waveform modification module, coupled to the power conversion module, for modifying the AC current to generate a modified AC current, where each phase of the modified AC current has a value of zero at the beginning of an AC line cycle.