Generator Controller Power Failure Handling
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Solution Overview
Problem
In paralleled generators, communication failures can lead to inefficiencies and potential system failures due to the activation of droop mode when a generator is temporarily disconnected or out of communication, causing speed instability and load imbalances, which should be avoided in cases of intentional disabling for maintenance or routine service.
Innovation Solution
A generator controller detects the disconnection of the primary power source and switches to a secondary power source, generating a power failure message to prevent unnecessary communication failure handling, allowing the system to maintain normal operation and avoid droop mode activation when a generator is intentionally disabled.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the system activates droop mode upon communication failure, then it can handle permanent generator disconnections, but it causes speed instability and load imbalances when the disconnection is temporary or intentional for maintenance
Solution Approach 1:
The system performs preliminary actions by detecting battery disconnection before communication failure occurs. The controller identifies the loss of primary power source and proactively sends a power failure message to prevent other generators from activating droop mode, thereby maintaining system stability while handling the power source issue
Solution Approach 2:
The patent introduces an intermediary mechanism - a power failure message - that mediates between the actual power source status and the communication failure detection. This message acts as a signal to prevent other generators from misinterpreting the communication loss as a permanent disconnection, thus avoiding unnecessary droop mode activation
2Reliability
If the system treats all communication failures as permanent disconnections, then it can ensure safe operation, but it causes unnecessary droop mode activation and load imbalances during temporary disconnections
Solution Approach 1:
The system performs preliminary detection of battery disconnection and sends a power failure message before communication failure is detected by other generators. This preliminary action allows the system to maintain safe operation while preventing unnecessary droop mode activation, thus preserving load sharing efficiency
Solution Approach 2:
The system changes the operational parameters of other generators by sending a power failure message, which modifies their expected behavior upon communication failure. Instead of activating droop mode, the generators maintain normal load sharing operation, improving productivity while ensuring safe operation through the preliminary parameter change
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 prevents unnecessary activation of droop mode, reducing speed instability and load imbalances, ensuring efficient load sharing and preventing system failures by distinguishing between permanent and temporary communication losses.
Implementation Method 1
A generator controller detects the disconnection of the primary power source and switches to a secondary power source
Data Source
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AI summary
An electrical power generator system may include two or more paralleled generators. At least one of the generators includes a first power source and a second power source. A disconnection of a first power source is identified at a generator controller of one of the generators. The generator controller may be configured to access or generate a power failure message indicative of the disconnection of the first power source. The generator controller may be configured to transmit the power failure message using the second power source because the second power source is switched to the generator controller in response to the disconnection of the first power source. The system may enter a communication failure handling mode based on the power failure message.