Internal Combustion Engine Fuel Metering for Generator Synchronization
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Solution Overview
Problem
During network faults, such as electric short-circuits, internal combustion engines connected to synchronous generators experience unwanted changes in operating parameters like rotary speed and load angle, leading to potential loss of synchronization and generator damage, especially due to back-swing effects which can cause pole slip and instability.
Innovation Solution
Temporarily increasing the mechanical power delivered by the internal combustion engine by adjusting fuel intake through fuel metering devices, such as port injection valves, based on detected operating parameter deviations during network faults to counteract drops in rotary speed and maintain stability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional measures are taken to reduce rotary speed and load angle during network faults, then synchronization is maintained, but back-swing effects cause pole slip and generator instability
Solution Approach 1:
The control device increases the amount of fuel introduced into the internal combustion engine before or at the onset of back-swing effects, creating a preliminary counteracting torque that prevents pole slip and stabilizes the generator during network faults
Solution Approach 2:
The control device continuously monitors operating parameters (rotary speed, load angle, network voltage) and dynamically adjusts fuel introduction based on detected deviations, enabling real-time stabilization during network faults and back-swing events
2Reliability
If the amount of fuel introduced into the internal combustion engine is increased during network faults, then rotary speed stability is improved, but fuel consumption increases
Solution Approach 1:
The control device applies increased fuel introduction only during specific periods when network faults or back-swing effects are detected, rather than continuously, thereby maintaining rotary speed stability while minimizing overall fuel consumption
Solution Approach 2:
The control device applies excessive fuel introduction temporarily during critical moments of network fault to ensure stability, accepting localized excess fuel consumption to achieve overall system reliability
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 approach stabilizes the generator by reducing the likelihood of pole slip and maintaining synchronization during network faults, particularly by addressing back-swing effects, and is effective in power supply networks with low inertia constants.
Implementation Method 1
A mechanical power delivered by the internal combustion engine is introduced into the generator
Implementation Method 2
a synchronous generator, during a network fault, in particular during an electric short-circuit, in a power supply network connected to the generator. A mechanical power delivered by the internal combustion engine is introduced into the generator and is converted into electric power in the generator
Data Source
AI summary
A method involves operating an internal combustion engine connected to an electric generator, in particular a synchronous generator, during a network fault, in particular during an electric short-circuit, in a power supply network connected to the generator. A mechanical power delivered by the internal combustion engine is introduced into the generator and converted into electric power in the generator. The electric power is delivered to the power supply network, and the mechanical power delivered by the internal combustion engine is at least temporarily increased depending on the value of at least one operating parameter of the generator and/or the internal combustion engine prior to the network fault and/or during the network fault, preferably by an amount of a fuel introduced into the internal combustion engine being increased.