Photovoltaic Inverter Phase Control for Zero-Voltage Switching
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Solution Overview
Problem
Existing power converting apparatuses in solar power generation systems face inefficiencies due to the need for zero voltage switching, which requires a certain current flow, leading to decreased efficiency and increased peak current.
Innovation Solution
A power converting apparatus with a photovoltaic inverter and controller that controls the phase difference between switchers and legs to minimize phase differences, utilizing a transformer and resonant inductor to achieve zero voltage switching and reduce peak current.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of energy
If zero voltage switching is implemented in a photovoltaic inverter with DAB structure, then switching losses are reduced, but a certain current flow is required which decreases power converting efficiency
Solution Approach 1:
The patent changes the operating parameters by minimizing the phase difference between primary and secondary switchers and controlling the phase difference between first and second legs of the primary switcher. This parameter optimization allows zero voltage switching to be achieved while reducing the required current flow, thereby maintaining higher power converting efficiency
Solution Approach 2:
The patent dynamically adjusts the switching phases and leg operations based on real-time conditions. By making the phase differences controllable and adjustable rather than fixed, the system can adapt to maintain zero voltage switching conditions while minimizing unnecessary current flow and maximizing efficiency
2Reliability
If zero voltage switching is implemented in a photovoltaic inverter with DAB structure, then switching performance is improved, but peak current increases
Solution Approach 1:
The patent optimizes switching parameters by minimizing the phase difference between primary and secondary switchers and controlling leg phase differences. This parameter tuning achieves zero voltage switching for improved reliability while reducing the magnitude of peak current through more efficient switching coordination
Solution Approach 2:
The controller monitors and adjusts switching phases based on system conditions, using feedback to maintain optimal phase differences that enable zero voltage switching while preventing excessive peak current. The controller dynamically regulates switching timing to balance performance and current requirements
Data Source
AI summary
A power converting apparatus includes a photovoltaic inverter configured to convert direct current power from a photovoltaic module into alternating current power, and a controller configured to control the photovoltaic inverter, wherein the photovoltaic inverter includes a first switcher configured to perform switching on the direct current power, a transformer having an input side connected to an output end of the first switcher, and a second switcher connected to an output side of the transformer, and the controller is configured to control at least one of a voltage and current of the first switcher and a voltage and current of the second switcher.