Variable Frequency Voltage Regulator for Engine Bus Adaptation
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing generator sets face challenges in synchronizing frequency and voltage with variable frequency loads, leading to stress on mechanical components and inefficiencies, as traditional voltage regulators are preset for specific frequencies and cannot adapt to a continuum of bus frequencies.
Innovation Solution
A variable frequency voltage regulation system that includes a genset controller and voltage regulator configured to select set points based on a frequency response curve, with a voltage regulation controller determining the desired bus frequency and updating the frequency response curve to optimize genset operation, allowing direct connection to a variable frequency bus without additional conversion stages.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If traditional preset voltage regulators are used for specific bus frequencies, then voltage regulation is simple and reliable, but the system cannot adapt to variable frequency bus operations
Solution Approach 1:
The voltage regulator transitions from static preset values to dynamic adaptive regulation. The controller continuously adjusts voltage setpoints based on real-time bus frequency measurements and generator characteristics, enabling the system to adapt to variable frequency operations while maintaining stability through ongoing optimization rather than fixed configurations
Solution Approach 2:
The system changes operational parameters (voltage setpoints, excitation current) based on bus frequency variations. By dynamically adjusting these parameters according to the actual operating conditions and generator frequency-response characteristics, the regulator maintains effective voltage control across a continuum of bus frequencies without requiring conversion stages
2Adaptability or versatility
If frequency conversion stages are added to handle variable frequency loads, then compatibility with loads is improved, but system complexity and maintenance costs increase
Solution Approach 1:
The patent removes the frequency conversion stage from the system architecture. By directly connecting variable frequency generators to variable frequency loads and implementing adaptive voltage regulation at the generator level, the system eliminates the need for intermediate conversion equipment, thereby reducing complexity while maintaining full compatibility with variable frequency operations
Solution Approach 2:
The voltage regulator is designed to perform multiple functions: voltage regulation, frequency adaptation, and load compatibility management. This multi-functional approach allows the system to handle variable frequency operations directly without requiring separate conversion stages, as the regulator itself adapts to accommodate the full range of operating conditions
3Power
If large loads are connected to the bus, then power delivery is improved, but prime mover speed drops rapidly causing generator output fluctuations and mechanical stress
Solution Approach 1:
The voltage regulator implements continuous feedback control by monitoring bus voltage and frequency, generator output, and load conditions. This feedback mechanism allows the system to detect and respond to prime mover speed variations in real-time, dynamically adjusting excitation current to compensate for frequency changes and maintain stable generator output even when large loads are connected
Solution Approach 2:
The system uses frequency-response curves to predict and prepare for load-induced frequency variations. By pre-characterizing generator behavior across different operating points and using this information to proactively adjust voltage setpoints and excitation, the regulator prevents output fluctuations before they occur, maintaining stability during large load transitions
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 system dynamically regulates electrical output to match desired frequencies and voltages, improving fuel efficiency, reducing system complexity and maintenance costs, and preventing genset stalling by eliminating the need for frequency conversion stages.
Implementation Method 1
The motive force, in turn, is used to rotate a rotor relative to a stator of the generator so that a rotating magnetic field induces an electrical current in the field windings of the stator
Implementation Method 2
A voltage regulator can compensate for transient voltage fluctuation by increasing or reducing the excitation on the stationary coil in the generator
Data Source
AI summary
A system and method for variable frequency voltage regulation is presented. The system includes a variable frequency bus and a variable frequency load directly connected to the variable frequency bus. A plurality of variable frequency gensets are directly connected to the variable frequency bus. Each variable frequency genset includes a genset controller configured to select set points based on a selected frequency response curve of the variable frequency bus. A variable frequency voltage regulator is configured to regulate an electrical output of the variable frequency generator based on the selected set points. The system includes a voltage regulation controller configured to determine a desired bus frequency based on the variable frequency load, and determine an optimal frequency response curve based on the desired bus frequency and a frequency response model of each VFG. The selected frequency response curve is updated based on the determined optimal frequency response curve.