Generator Exciter Device for Voltage Stability
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Solution Overview
Problem
Conventional self-excited power generator systems experience significant voltage drops when load increases, requiring a long time to recover, and are limited by compatibility with only a few types of voltage regulators.
Innovation Solution
A power generator system that includes a field winding, alternator, voltage regulator, and generator exciter device, where the generator exciter device generates an auxiliary excitation voltage that is summed with the primary excitation voltage to ensure the total excitation voltage is not less than the primary excitation voltage, allowing for improved voltage regulation and compatibility with all types of voltage regulators.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a conventional generator exciter device is used to provide power to the voltage regulator, then the voltage regulator can provide more power to excite the field winding and reduce voltage drop, but the device can only be used with a few types of voltage regulators
Solution Approach 1:
The generator exciter device is designed with a universal output interface that can be coupled to different types of voltage regulators through the field winding connection. The device provides excitation power in a standardized manner that works with various voltage regulator designs, making the exciter device compatible with multiple regulator types without requiring modification.
2Device complexity
If the field winding receives only primary excitation voltage from the voltage regulator, then the system is simpler, but the voltage amplitude drops significantly when load increases and recovery time is long
Solution Approach 1:
The generator exciter device provides preliminary excitation power to the field winding before the voltage regulator can fully respond to load changes. By pre-charging the field winding with excitation voltage from the exciter device, the system maintains voltage stability during sudden load increases and reduces recovery time, as the field winding already has sufficient magnetic field energy when the load step occurs.
Solution Approach 2:
The system combines the output of the voltage regulator with the output of the generator exciter device, both connected to the field winding. The voltage regulator and exciter device work together in parallel, with the exciter device providing additional excitation current that supplements the regulator's output, thereby reducing voltage drop and accelerating voltage recovery without significantly increasing system complexity.
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 reduces the amplitude drop and recovery time of the output voltage, enabling faster stabilization and compatibility with various voltage regulators without modification.
Implementation Method 1
The inverter is used to receive a DC (direct current) input voltage, and converts the DC input voltage to generate an AC (alternating current) inverted voltage
Implementation Method 2
The rectifier is coupled to the inverter for receiving the AC inverted voltage therefrom, is coupled further to the first and second output terminals of the generator exciter device, and rectifies the AC inverted voltage to generate an auxiliary excitation voltage
Implementation Method 3
The field winding has a first input terminal and a second input terminal, receives a total excitation voltage at the first and second input terminals thereof, and generates a magnetic field based on the total excitation voltage
Implementation Method 4
The alternator generates an output voltage based on the magnetic field generated by the field winding
Data Source
AI summary
A power generator system includes a field winding, an alternator, a voltage regulator and a generator exciter device. The field winding generates a magnetic field based on a total excitation voltage thereacross. The alternator generates an output voltage based on the magnetic field. The voltage regulator generates a primary excitation voltage based on the output voltage. The generator exciter device generates an auxiliary excitation voltage. The generator exciter device and the voltage regulator are coupled in series across the field winding, so that the auxiliary excitation voltage and the primary excitation voltage are summed into the total excitation voltage which is not less than the primary excitation voltage in magnitude.