Grid Connection Switching for Reverse Power Flow Prevention
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Solution Overview
Problem
Existing grid-tie switches only prevent reverse power flow when the utility grid has failed, leaving a gap in protection when the grid is still operational but not fully powered, posing safety risks to service personnel.
Innovation Solution
A power flow control system with a controllable switch and voltage/current sensors that dynamically manage the connection between a local electrical circuit and the utility grid, ensuring no reverse power flow by opening the switch when grid power approaches zero and closing it when grid power is available, using voltage and current sensing to determine the optimal connection state.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If grid-tie switches are used to prevent reverse power flow, then power flow control is achieved when the grid has failed, but protection is insufficient when the grid is still operational but not fully powered
Solution Approach 1:
The patent implements dynamic power flow control by continuously monitoring grid voltage and locally generated power levels, and adjusting the controllable switch state accordingly. The system transitions from static grid-tie switch operation to dynamic control that adapts to varying grid conditions, preventing reverse power flow when locally generated power exceeds grid voltage while allowing bidirectional power flow when grid power is available.
2Object-affected harmful factors
If the controllable switch is opened to prevent reverse power flow, then reverse power flow is blocked, but power flow control flexibility is reduced
Solution Approach 1:
The system employs feedback control by continuously measuring grid voltage and locally generated power, comparing these values to determine the appropriate switch state. The controller receives real-time information about power generation and grid conditions, and automatically adjusts the controllable switch to maintain safe operating conditions while maximizing power utilization. This closed-loop feedback enables the system to prevent reverse power flow without requiring manual intervention or sacrificing operational flexibility.
Data Source
AI summary
The present disclosure relates to prevention of reverse power flow into an electrical utility grid. An electrical circuit connector is for connection to an electrical circuit that includes one or more electrical loads and one or more electrical power sources to provide electrical power to the electrical load(s). An electrical grid connector is for connection to an electrical utility grid. A connection state between the electrical grid connector and the electrical circuit connector is controlled based on respective voltages, at the electrical circuit connector and at the electrical grid connector, and a state of power flow between the electrical grid connector and the electrical circuit connector.