Parallel Generator Load Balance via Field Current Synchronization
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Solution Overview
Problem
In parallel operations of multiple electric generators driven by a single internal combustion engine, existing power generation control devices lead to uneven load distribution due to variations in target voltage values, causing one generator to interrupt field current while another supplies it for longer periods, resulting in unequal lifetimes.
Innovation Solution
The proposed power generation control apparatus synchronizes field current control operations between generators by connecting the external output terminal of the main generator to the external sensing terminal of the subordinate generator, ensuring equal load balance through synchronized field current control.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional power generation control devices are used in parallel operations, then each generator operates independently with its own field current control, but load distribution becomes uneven due to variations in target voltage values, causing unequal lifetimes
Solution Approach 1:
The invention implements feedback control by having the subordinate generator's control device receive the main generator's field current control signal through the external sensing terminal, and use this feedback to synchronize its own field current control operation, thereby achieving balanced load distribution and equal lifetimes
Solution Approach 2:
The invention creates equipotentiality in control by connecting the external output terminal of the main generator to the external sensing terminal of the subordinate generator, ensuring both generators operate at the same control potential and interrupt field current simultaneously, eliminating the load imbalance caused by voltage value variations
2Ease of operation
If field current control is implemented independently in each generator, then each generator can maintain its own voltage regulation, but the control operations become desynchronized, causing one generator to supply field current for longer periods
Solution Approach 1:
The invention merges the control operations of multiple generators by having the subordinate generator's control device receive and respond to the main generator's control signal, synchronizing the field current interruption timing across all generators while maintaining independent control capability
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 synchronization of field current control operations equalizes the load balance between individual generators and their respective control devices, preventing unequal lifetimes and ensuring stable power generation.
Implementation Method 1
a switching transistor 401 for switching (hereinafter referred to as a switching transistor 401) and a reflux diode 402 which are inserted between the output sensing terminal a and the terminal e so as to conduct and interrupt a field current to the field coil 2
Implementation Method 2
a resistance 416 and a Zener diode 417 which generate the reference power supply voltage V from the voltage of the starting terminal b
Implementation Method 3
comparators 406, 407 connected to an input terminal of the NOR circuit 405
Implementation Method 4
a NOR circuit 405 connected to a gate terminal of the switching transistor 401
Implementation Method 5
a stator coil 1, a field coil 2 that is driven to rotate by means of an internal combustion engine
Data Source
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AI summary
A power generation control apparatus is obtained in which when a plurality of electric generators are caused to operate in parallel with one another at the same time, field current control operations of individual power generation control devices are caused to synchronize with one another thereby to equalize load balance therebetween. A first power generation control device connected to a main electric generator (ACG1) and a second power generation control device connected to a subordinate electric generator (ACG2) are each provided with an external sensing terminal (c1, c2) that detects an external voltage of each electric generator to which itself belongs, an output sensing terminal that detects a power generation voltage generated by each electric generator itself, and the external output terminal (d1, d2) that outputs a signal synchronized with a field current control signal for each field coil of each electric generator. When the plurality of electric generators are caused to drive at the same time, the external output terminal (d1) of the first power generation control device and the external sensing terminal (c2) of the second power generation control device are connected to each other.