Multi-Boost Inverter Control for Lower Switching Losses
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Solution Overview
Problem
Conventional inverter systems experience significant switching losses and component overheating due to excessive boosting ratios of low voltage boost circuits, leading to derating and compromised power generation output.
Innovation Solution
A method and device for controlling an inverter that involves determining the maximum voltage among input terminals of multiple boost circuits and the minimum voltage required for grid-connection. The first boost circuit is stopped from boosting when the maximum voltage meets or exceeds the minimum voltage, and the output voltage of second boost circuits is controlled to match the maximum voltage, thereby reducing boosting ratios and switching losses.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If all boost circuits are turned on simultaneously, then the bus voltage can accommodate high and low voltage fluctuations, but the boosting ratios of low voltage boost circuits become excessive causing significant switching losses
Solution Approach 1:
The patent applies dynamic control by adjusting the switching states of different boost circuits based on real-time input voltage conditions. The controller dynamically determines which boost circuits to activate, transitioning from static simultaneous activation to adaptive selective activation, thereby optimizing the boosting ratio and reducing switching losses under varying voltage conditions
Solution Approach 2:
The patent changes the operating parameters of the boost circuits by adjusting their switching states based on input voltage levels. By monitoring the input voltage and selectively enabling or disabling specific boost circuits, the system optimizes the boosting ratio parameter to minimize switching losses while maintaining the required bus voltage level
2Adaptability or versatility
If all boost circuits are turned on simultaneously, then the system can handle voltage variations, but component overheating occurs leading to derating operation
Solution Approach 1:
The system dynamically adjusts the operational state of each boost circuit based on real-time voltage conditions, preventing unnecessary operation of circuits that would generate excessive heat. This dynamic control reduces overall system temperature and prevents component overheating while maintaining adaptability to voltage variations
Solution Approach 2:
By changing the switching state parameters of the boost circuits based on input voltage levels, the system reduces unnecessary power dissipation and heat generation in low-voltage circuits, thereby controlling component temperatures and preventing derating operation
3Power
If high boosting ratios are used in low voltage boost circuits, then the bus voltage can be maintained, but switching losses increase significantly
Solution Approach 1:
The patent segments the boost circuits into multiple independent units, each capable of being controlled individually. This segmentation allows the system to activate only the necessary boost circuits based on input voltage conditions, avoiding excessive boosting ratios in low-voltage circuits and reducing switching losses while maintaining the required bus voltage
Solution Approach 2:
The system dynamically selects which segmented boost circuits to activate based on real-time voltage conditions, optimizing the boosting ratio for each active circuit to minimize switching losses while maintaining the required bus voltage level
Data Source
AI summary
A method and device for controlling an inverter, an inverter and a photovoltaic system are provided. Maximum voltage among input terminals of multiple boost circuits included in the inverter and a minimum voltage for grid-connection are obtained. When the maximum voltage is greater than or equal to the minimum voltage, a first boost circuit in the inverter is controlled to stop boosting. The voltage at an output terminal of a second boost circuit is controlled to be increased to the maximum voltage, and the second boost circuit includes other boost circuits in the inverter other than the first boost circuit.