Connected Inverter Topology for Portable Three-Phase Power
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Solution Overview
Problem
Existing portable power solutions struggle to efficiently provide multiple AC power outputs without causing ripple currents in batteries and cannot safely produce three-phase power from a portable power supply.
Innovation Solution
A configuration of multiple connected battery-powered inverters arranged in wye or open delta configurations, controlled by a switching arrangement and a controller to adjust phase angles and voltage, allowing for flexible power output to meet various AC load requirements.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If multiple inverters are connected to provide multiple AC power outputs, then the power output capability is improved, but ripple currents are generated in the batteries causing potential damage
Solution Approach 1:
The system divides the power output into multiple independent inverter units, each with its own battery connection. The controller segments the control of phase angles for each inverter, allowing independent adjustment to prevent ripple current generation while maintaining multiple AC power outputs.
Solution Approach 2:
The controller dynamically adjusts the phase angle parameter of each inverter's power signal. By changing the phase angle parameters, the system can synchronize multiple inverters to work together without generating harmful ripple currents in the shared battery power source.
2Adaptability or versatility
If three-phase power is generated from a portable power supply, then the ability to power industrial equipment is improved, but system complexity and safety risks increase
Solution Approach 1:
The portable power supply system is designed with universal functionality to provide both single-phase and three-phase power outputs using the same inverter units. By configuring inverters in different arrangements (parallel for single-phase, wye or delta for three-phase), the system can adapt to various industrial equipment requirements without requiring separate dedicated systems.
Solution Approach 2:
The system uses dynamic switching arrangements that can reconfigure the inverter connections based on the required output type. The switching arrangement allows the system to dynamically transition between single-phase and three-phase configurations, reducing overall system complexity by using one adaptable system rather than multiple fixed systems.
3Adaptability or versatility
If inverters are arranged in wye or open delta configurations, then the flexibility to meet various AC load requirements is improved, but the control complexity increases
Solution Approach 1:
The switching arrangement provides dynamic reconfiguration capability, allowing the system to switch between wye and open delta configurations based on load requirements. This dynamic switching simplifies control by using a single controller that manages both configurations rather than requiring separate control systems for each arrangement.
Solution Approach 2:
The system pre-configures the switching arrangement and inverter connections to enable rapid transition between wye and open delta configurations. By preparing the switching infrastructure in advance, the system reduces the complexity of real-time control decisions and enables quick adaptation to different AC load requirements.
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
Enables efficient and safe generation of both single-phase and three-phase AC power from a portable power supply, preventing ripple currents and supporting multiple AC loads without battery damage.
Implementation Method 1
a first inverter configured to be powered by a first battery and to provide a first power signal having a first phase angle to the AC output, a second inverter configured to be powered by a second battery and to provide a second power signal having a second phase angle to the AC output
Data Source
AI summary
A power supply includes a first inverter and a second inverter. The second inverter is connected in series with the first inverter in an open delta configuration. The first inverter is configured to be powered by a first battery and to output a first power signal having a first phase angle. The second inverter is in electrical communication with the first inverter and configured to be powered by a second battery and to output a second power signal having a second phase angle. The power supply also includes a controller configured to control a phase difference between the first phase angle and the second phase angle to control a magnitude of a combined output voltage of the first inverter and the second inverter.