Dummy Output Unit for Reverse Power Flow Prevention
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Solution Overview
Problem
Power control systems face challenges in preventing reverse power flow during grid interconnected operation, which can lead to erroneous operations and energy inefficiencies.
Innovation Solution
A power control system that includes a dummy output unit and a controller to determine the supply state of a dummy current, allowing the system to differentiate between independent and interconnected operations and prevent reverse power flow by controlling the dummy output unit accordingly.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a dummy output unit supplies dummy current to a current sensor during independent operation, then the system can differentiate between independent and interconnected operations, but the device complexity increases
Solution Approach 1:
The dummy output unit supplies dummy current in advance during independent operation to simulate forward power flow conditions. This preliminary action ensures the current sensor receives appropriate input signals before actual power flow occurs, enabling the control unit to correctly identify operation modes and prevent reverse power flow during interconnected operation.
Solution Approach 2:
The dummy output unit acts as an intermediary component that mediates between the power generation facility and the current sensor. By introducing this intermediate element, the system can simulate different operating conditions without requiring direct changes to the main power flow path, thus differentiating between independent and interconnected operations while maintaining system stability.
2Measurement precision
If the system supplies dummy current during independent operation, then measurement precision is improved, but loss of energy increases
Solution Approach 1:
The dummy output unit operates periodically or conditionally based on the detected operation mode. It supplies dummy current only during independent operation when needed for accurate measurement, and stops supplying dummy current during interconnected operation. This periodic/conditional action pattern maintains measurement precision while minimizing unnecessary energy consumption from the dummy current supply.
Solution Approach 2:
The dummy current supply is applied locally and selectively only to the current sensor during independent operation, rather than throughout the entire power system. This localized application ensures accurate current detection where needed while limiting energy loss to only the minimal amount required for the dummy current supply in the specific measurement circuit.
3Reliability
If the control unit determines supply state normalcy and controls dummy output unit operation, then reliability is improved, but device complexity increases
Solution Approach 1:
The control unit continuously monitors the operation state and feedback from the current sensor to determine whether the dummy current supply state is normal. Based on this feedback, the control unit automatically adjusts the dummy output unit's operation - maintaining dummy current supply during independent operation and stopping it during interconnected operation. This feedback mechanism ensures reliable reverse power flow prevention while using automated control to minimize the complexity burden.
Data Source
AI summary
A power control system comprises: a dummy output unit configured to supply a dummy current to a current sensor during independent operation, and not supply the dummy current to the current sensor during interconnected operation, the dummy current corresponding to forward power flow; and a controller configured to determine whether a supply state of the dummy current is normal, and control whether to continue operation of the dummy output unit.