Synchronous Machine Control via Pre-computed Voltage-Current Dependencies
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Solution Overview
Problem
Current methods for controlling synchronous machines lack the ability to accurately determine and regulate an optimal operating point, particularly in quasi-stationary operations, due to incomplete description of saturation dependencies and voltage-current relationships.
Innovation Solution
A method that determines the functional dependency of voltage components on current components using finite element methods or measurements, and then operates the synchronous machine to achieve an optimal operating point by controlling current components based on these dependencies, considering the ohmic resistances and flux components.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If conventional control methods are used for synchronous machines, then the control system is simple, but the ability to accurately determine and regulate optimal operating point is insufficient
Solution Approach 1:
The patent applies preliminary action by pre-determining the functional dependencies of voltage components on current components through FEM calculations or measurements before actual operation. These pre-computed relationships (Ud(Id,Iq), Uq(Id,Iq), UE(Id,Iq)) are stored and used during control, eliminating the need for complex real-time optimization algorithms while achieving accurate optimal operating point determination.
Solution Approach 2:
The patent introduces an intermediary approach by using pre-computed functional relationships as a mediator between the complex physical system and the simple controller. Instead of directly solving complex electromagnetic saturation problems in real-time, the controller uses these pre-determined relationships to accurately determine optimal operating points with minimal computational effort.
2Productivity
If saturation dependencies are not fully described, then the control method is simpler, but the operational efficiency is reduced
Solution Approach 1:
The patent performs FEM calculations or measurements in advance to fully characterize saturation dependencies across the entire operating range. This preliminary modeling captures all nonlinear magnetic effects, allowing the controller to achieve optimal efficiency without requiring complex real-time calculations. The pre-computed functional relationships encode complete saturation information that can be efficiently queried during operation.
3Measurement precision
If real-time calculation of voltage-current relationships is performed, then the control accuracy is improved, but the calculation time increases
Solution Approach 1:
The patent resolves the time-accuracy tradeoff by performing all complex FEM calculations and measurements beforehand. The resulting functional relationships (Ud(Id,Iq), Uq(Id,Iq), UE(Id,Iq)) are stored in lookup tables or analytical forms that can be quickly evaluated during real-time control. This shifts the computational burden from runtime to offline preparation, achieving both high accuracy and fast response.
Data Source
AI summary
The invention relates to a method for setting an optimal operating point for a synchronous machine, to a method for controlling a synchronous machine, and to a synchronous machine, wherein a functional dependency of the voltage components Ud, Uq, UE on the current components ld, lq, lE is determined for the synchronous machine by means of an FEM method or by means of a measuring method in a first method step according to the invention, and the dependency of the flex component Ψd, Ψq, ΨΕ on the current components ld, lq, lE is determined therefrom according to formula (I), wherein R1 and R2 are the ohmic resistances of the corresponding windings of the synchronous machine, and the synchronous machine is operated in controlled operation in a second method step according to the invention, wherein an operating point is determined according to formulas (II), (III), and (IV) and is then set.