Synchronous Generator Control via DC Voltage Feedback
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Solution Overview
Problem
Existing synchronous power generation systems face challenges in effectively operating under varying speed and load conditions, necessitating improved control methods for efficient power output.
Innovation Solution
A control method for synchronous electrical machines that involves comparing desired and actual DC voltages, determining operating frequencies, and using flux and torque component currents to control stator winding and field winding currents, eliminating the need for stator AC voltage loop closure, and employing a power conversion system with electronic elements like PWM signal drivers and controller blocks to regulate DC bus voltage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If traditional synchronous power generation systems operate under varying speed and load conditions, then the system must adapt to dynamic conditions, but the control complexity and response time deteriorate
Solution Approach 1:
The system dynamically adjusts control parameters including flux component current and torque component current based on operating frequency and load conditions. The flux value is pre-calculated and stored in lookup tables for different operating frequencies, allowing the controller to quickly adapt to varying speed and load conditions without complex real-time calculations
Solution Approach 2:
Flux values are pre-calculated and stored in lookup tables before operation. When the system needs to adapt to new operating conditions, the controller simply retrieves the pre-computed flux value corresponding to the current operating frequency, eliminating the need for complex real-time flux calculations and reducing control complexity
2Reliability
If traditional systems use AC voltage loop closure for control, then voltage regulation is achieved, but the response speed to load changes deteriorates
Solution Approach 1:
The patent replaces the traditional AC voltage loop closure control mechanism with a direct DC voltage control approach. Instead of measuring and regulating AC stator voltage through complex feedback loops, the system directly controls the DC bus voltage by adjusting the flux component current and torque component current, achieving both voltage regulation and fast response to load changes
Solution Approach 2:
The system implements feedback control by comparing the actual DC bus voltage with the reference DC voltage and using the voltage error to adjust the flux component current and torque component current. This direct DC voltage feedback provides both accurate voltage regulation and fast response to load changes
3Speed
If the system optimizes for fast response to load changes, then control speed improves, but manufacturing complexity increases
Solution Approach 1:
Flux values are pre-calculated and stored in lookup tables for different operating frequencies. The controller simply retrieves the appropriate flux value based on the current operating frequency and uses it to control the excitation current, achieving fast response without complex real-time calculations or additional hardware
Solution Approach 2:
The patent uses lookup tables that contain pre-computed flux values for different operating frequencies. Instead of performing complex real-time calculations, the controller copies the appropriate flux value from the lookup table based on the current operating frequency, achieving fast response with simple implementation
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 enables optimal efficiency and faster response to load changes, optimizing synchronous generator operation by controlling armature and field currents based on pre-calculated flux levels, thereby improving power generation system performance under dynamic conditions.
Implementation Method 1
a synchronous generator (26) coupled to and powered by the engine
Implementation Method 2
a power conversion system (28) configured to control an output of the synchronous generator (26) and supply electrical power from the synchronous generator (26) to a DC bus (34)
Data Source
AI summary
One embodiment of the present invention is a unique method of controlling the output of a synchronous electrical machine. Another embodiment is a unique method of controlling the output of a synchronous electrical machine for powering a load. Still another embodiment is a unique aircraft power generation system. Other embodiments include apparatuses, systems, devices, hardware, methods, and combinations for fluid driven actuation systems. Further embodiments, forms, features, aspects, benefits, and advantages of the present application will become apparent from the description and figures provided herewith.