Isolating Transformer Integration for Grid-Tie Inverter Safety
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Solution Overview
Problem
Existing grid tie inverters and energy storage devices lack economic integration and sufficient isolation, leading to potential damage and inefficient operation, making them costly and complex for smaller-scale energy producers.
Innovation Solution
A device with an isolating transformer, power switch, diode, energy storage medium, and inverter, controlled by a controller to modulate power flow and manage energy distribution between energy sources and a power network, ensuring safe and efficient operation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If existing grid tie inverters and energy storage devices are used separately without integration, then each component can be independently selected and replaced, but the system lacks sufficient isolation between energy storage device and DC input causing potential damage and requiring supplemental safety equipment
Solution Approach 1:
The patent combines the grid tie inverter and energy storage device into a single integrated unit, merging previously separate components into one cohesive system that provides both power conversion and energy storage functions with built-in isolation protection
Solution Approach 2:
The patent introduces an isolating transformer as an intermediary component between the DC input and energy storage device, providing galvanic isolation that protects both components from voltage spikes and electrical damage while enabling safe energy transfer
2Reliability
If supplemental safety equipment is added to provide isolation, then safety and protection are improved, but the system complexity and cost increase
Solution Approach 1:
The isolating transformer is integrated into the core system architecture rather than being added as a separate safety add-on, combining protection functionality with the main power conversion operation to avoid redundant components
Solution Approach 2:
The isolating transformer serves multiple functions simultaneously: providing galvanic isolation for safety, enabling bidirectional power flow control, and facilitating efficient energy transfer between DC and AC sides, replacing the need for multiple dedicated safety devices
3Productivity
If existing grid tie inverter designs are used, then the system can operate, but control efficiency between sources and power grids is insufficient
Solution Approach 1:
The controller continuously monitors system parameters including DC voltage, AC output current, and power flow direction, using feedback signals to dynamically adjust switching duties and optimize power transfer efficiency between energy sources and the grid
Solution Approach 2:
The system employs dynamic control strategies that adapt switching frequencies and duty cycles based on real-time operating conditions, enabling efficient bidirectional power flow control whether charging or discharging the energy storage device
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
The solution provides efficient control and isolation, enhancing safety and reducing costs for smaller-scale energy producers by effectively managing power flow between energy sources and the power network.
Implementation Method 1
at least one isolating transformer. At least one input is coupled to the at least one isolating transformer and configured to receive input from an energy source
Implementation Method 2
An inverter includes one or more inverter switches, an inverter input, and an inverter output. The inverter input is coupled to the diode and the energy storage medium. The inverter output is configured to be coupled to the power network, and the inverter is configured to create AC power for distribution to the power network
Data Source
AI summary
A device includes at least one isolating transformer. An input is coupled to the at least one isolating transformer and configured to receive input from an energy source. At least one power switch is coupled to the isolating transformer. A diode is coupled to the at least one isolating transformer. An energy storage medium is coupled to the diode. An inverter includes one or more inverter switches, an inverter input, and an inverter output. The inverter input is coupled to the diode and the energy storage medium. The inverter output is configured to be coupled to the power network, and the inverter is configured to create AC power for distribution to the power network. A controller is configured to modulate the at least one power switch to control power flow from the input and to modulate the state of the inverter switches to control power flow to the power network.