Grid Interconnection System with Switching Unit for Battery Charging
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Solution Overview
Problem
Existing grid interconnection systems fail to efficiently charge storage batteries during power outages and require separate configurations for interconnecting with the power grid and charging/discharging batteries, leading to inefficiencies and increased manufacturing costs.
Innovation Solution
A grid interconnection system with a first power conditioner for converting DC power to AC and interconnecting with the grid, a second power conditioner for both discharging stored power and charging, and a switching unit controlled by a connection controller to switch between grid and battery power sources, ensuring stable AC voltage and reducing overcurrent risks.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a separate configuration is used for interconnecting with the power grid and charging/discharging batteries, then the system can perform both functions, but the device complexity and manufacturing costs increase
Solution Approach 1:
The patent combines the grid interconnection function and battery charging/discharging function into a single power conditioner unit. The switching unit integrates both grid connection and battery connection capabilities, allowing one device to perform multiple functions that would traditionally require separate configurations, thereby reducing device complexity while maintaining versatility
Solution Approach 2:
The power conditioner is designed with universal functionality to handle both grid interconnection and battery energy storage operations. The switching unit can dynamically connect to either the grid or the battery system, making the device adaptable to different operational modes without requiring separate dedicated equipment for each function
2Reliability
If the first power conditioner outputs AC power to the load during power outage, then the load receives power, but the storage battery cannot be charged efficiently
Solution Approach 1:
The switching unit dynamically changes its connection state based on the operational mode. During power outages, it switches to connect the first power conditioner's output to the load while isolating the battery from charging. During normal operation, it switches to enable battery charging. This dynamic switching resolves the contradiction by adapting the system configuration to the current operational requirements
3Ease of operation
If the switching unit switches connection destination during power outage, then the system can supply power to load, but overcurrent risks increase
Solution Approach 1:
The connection controller monitors the operational state and provides feedback control to the switching unit. It detects power outage conditions and automatically triggers the switching action to connect the appropriate power source to the load. The controller ensures smooth transition by coordinating the switching timing and sequence, preventing overcurrent conditions that would occur with abrupt or uncoordinated switching
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 charging of batteries during power outages and stable power supply to loads by automatically switching between charge and discharge modes, reducing manufacturing costs by eliminating the need for separate overcurrent prevention configurations.
Implementation Method 1
a first power conditioner configured to convert DC power output from a power generation unit to AC power corresponding to a voltage at an interconnection terminal
Implementation Method 2
a second power conditioner capable of being actuated both in a discharge mode for converting power stored in a storage battery to AC power
Implementation Method 3
in a charge mode for converting AC power input to the self-standing terminal to DC power and supplying the DC power to the storage battery
Data Source
AI summary
The grid interconnection system is provided with a switching unit configured to switch a connection destination of an interconnection terminal of a first power conditioner and a load, between a power grid and a self-standing terminal of a second power conditioner, and a connection controller configured to execute, on the switching unit, first control for connecting the power grid to the interconnection terminal of the first power conditioner and the load in a non-power outage of the power grid, and second control for connecting the self-standing terminal of the second power conditioner to the interconnection terminal of the first power conditioner and the load in a power outage of the power grid.