Multi-phase DC/AC Inverter Phase Quantity Mode Control
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Solution Overview
Problem
Multi-phase DC/AC inverters in distributed generator systems face inefficiencies when operating at reduced input power levels, expending excessive energy to maintain three-phase output power, leading to inefficient power conversion.
Innovation Solution
A method and apparatus that include a DC/AC inversion stage capable of generating single-phase, two-phase, and three-phase output power, with a conversion control module that adjusts the number of phases based on input power thresholds and operates in burst mode when necessary, reducing energy expenditure by dynamically adjusting the phase quantity mode and using phase rotation circuits to maintain balanced three-phase output.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a multi-phase DC/AC inverter operates all legs of the three-phase H-bridge to achieve three-phase output power during reduced input power conditions, then the three-phase output power is maintained, but the energy consumption increases and power conversion efficiency decreases
Solution Approach 1:
The inverter dynamically adjusts the number of active phases based on input power conditions. During reduced input power conditions, the system transitions from three-phase operation to single-phase operation, activating only one leg of the H-bridge while keeping other legs in high-impedance state, thereby reducing energy consumption while maintaining reliable power output when needed
Solution Approach 2:
The system changes operational parameters by switching between different phase configurations (three-phase, single-phase) based on input power thresholds. This parameter change allows the inverter to optimize energy consumption during low-input conditions while maintaining the capability to deliver three-phase power when input conditions improve
2Reliability
If a multi-phase DC/AC inverter operates all legs of the three-phase H-bridge to achieve three-phase output power during reduced input power conditions, then the three-phase output power is maintained, but the power conversion efficiency decreases
Solution Approach 1:
The system extracts and activates only the necessary phase legs required for current operating conditions. During reduced input power, only one leg is extracted for activation while other legs are removed from active operation and placed in high-impedance state, eliminating unnecessary energy losses from operating all legs when full three-phase power is not required
3Use of energy by moving object
If the inverter operates in single-phase mode during low input power conditions, then the energy consumption is reduced, but the output power capability is limited
Solution Approach 1:
The inverter provides dynamic output power capability by switching between single-phase and three-phase modes. During low input power conditions, it operates in single-phase mode with reduced energy consumption, and automatically transitions to three-phase mode when input power conditions improve, thereby maintaining full output power capability when needed while optimizing energy efficiency during constrained conditions
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This approach enhances the efficiency of power conversion by reducing energy consumption during low input power conditions and maintaining balanced three-phase output, thereby improving overall energy harvest and conversion efficiency.
Implementation Method 1
a solar power system comprising a plurality of photovoltaic (PV) modules that convert solar energy received from the sun into a direct current (DC)
Data Source
AI summary
A method and apparatus for generating AC power. In one embodiment, the apparatus comprises a DC/AC inversion stage capable of generating at least two of a single-phase output power, a two-phase output power, and a three-phase output power; and a conversion control module, coupled to the DC/AC inversion stage, for driving the DC/AC inversion stage to (i) generate the single-phase output power while an input power is less than a first threshold, and (ii) operate in burst mode while the input power satisfies a burst mode threshold.