Bidirectional Inverter Frequency Modulation for Local Grid Energy Balancing
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Solution Overview
Problem
Current islandable electrical systems are inefficient in managing local electrical energy when connected to a main network, leading to oversized and costly battery requirements and lack of flexibility in energy management, as they either disconnect completely or operate in slave mode, failing to balance energy demand and supply effectively.
Innovation Solution
An electrical system with a bidirectional inverter and charger device that allows frequency modulation and local energy management, enabling the system to connect to the main network for energy balancing, using a control device to adjust energy flow based on battery capacity and network frequency, allowing for indirect connection modes and states to optimize energy exchange.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a large battery is used to ensure service continuity in isolated mode, then reliability is improved, but cost and device size increase
Solution Approach 1:
The patent implements dynamic operating modes that allow the system to switch between isolated operation with local energy management and grid-connected operation. The battery size is optimized for partial autonomy rather than complete isolation, and the system dynamically adapts its energy management strategy based on grid availability and local production/consumption balance.
Solution Approach 2:
The system changes its operational parameters by switching between different modes: autonomous mode with local energy management, grid-connected mode with reduced battery reliance, and transitional modes. This allows the same battery to serve different functions depending on operational context, reducing the required capacity compared to permanent isolation.
2Adaptability or versatility
If the local network operates autonomously, then energy independence is improved, but device complexity increases due to large battery requirements
Solution Approach 1:
The patent segments energy management into multiple layers: local energy management at the microgrid level, regional management through the grid connection, and national-level grid management. This segmentation allows each layer to handle appropriate energy balances, reducing the burden on local battery capacity while maintaining energy independence where feasible.
Solution Approach 2:
The bidirectional inverter serves multiple functions: it manages local energy exchange, interfaces with the grid, provides frequency regulation, and enables mode transitions. This multi-functionality reduces the need for dedicated large-scale energy storage while maintaining autonomous operation capability when needed.
3Reliability
If the local network connects to the main grid, then energy supply reliability is improved, but local energy management capability is lost
Solution Approach 1:
The system dynamically switches between grid-connected operation with local energy management and autonomous operation. The bidirectional inverter enables real-time adjustment of power flow, allowing the system to maintain local energy management capabilities while connected to the grid, and to transition to full autonomy when necessary.
Solution Approach 2:
The control system continuously monitors local production, consumption, and grid conditions to make real-time decisions about power flow distribution. This feedback mechanism enables the system to prioritize local energy management while maintaining grid connection, automatically adjusting operations to balance local needs with grid interaction.
4Device complexity
If conventional on/off grid connection is used, then device complexity is reduced, but energy management flexibility is lost
Solution Approach 1:
The bidirectional inverter enables dynamic operation modes beyond simple on/off switching. The system can operate in grid-connected mode with local energy management, autonomous mode, and transitional modes with controlled power exchange. This dynamic capability provides energy management flexibility while using standard grid connection infrastructure.
Solution Approach 2:
The system changes operational parameters by adjusting power flow magnitude and direction through the bidirectional inverter. Rather than binary connection states, the system operates across a continuum of power exchange levels, enabling flexible energy management while using conventional grid connection hardware.
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 solution enables efficient local energy management, reduces battery size and cost, and allows for flexible energy balancing between local and main networks, maintaining service continuity while minimizing battery capacity needs.
Implementation Method 1
a bidirectional inverter device capable of operating in master mode, one output of which is connected to said local connection terminal and one input is connected to said battery
Implementation Method 2
a charger device having an input connected to said general connection terminal and an output connected to said input of the inverter device
Data Source
Figure 1~2
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Figure 5~6
AI summary
The invention relates to an electrical system comprising an interface device (1) between a general electrical network (3) and a local electrical network (2) to which electrical equipment (31, 32) is connected, comprising: - a battery (11); - a bidirectional inverter device (10) capable of operating in a frequency modulation mode; - a charger device (12); - a control device (14) capable of controlling the start-up of the charger device (12) when a need to transfer energy from the general electrical network to the local electrical network (2) is identified; - the interface device (1) being adapted to ensure local management of the electrical equipment (31, 32) connected to the local electrical network (2), so that the energy demand is substantially equal to the energy supply of said electrical equipment.