Abstract
By the virtue of its highly nonlinear magnetic characteristics, the Switched Reluctance Machine (SRM) poses a formidable challenge for digital current regulators operating at a fixed switching frequency. Very fast tracking performance demanded by highly dynamic reference current profiles often surpass the conventional limits on closed-loop bandwidth posed by finite sampling frequency. The non-linear nature of matched disturbance to be compensated by the controller appearing in the form of induced emf grows in significance as a function of operating speed while the varying nature of inductance profile stipulates a need for gain adaptation by the control law in order to maintain consistency in closed-loop dynamic response. In the view of these unique SRM characteristics, the paper presents a detailed theoretical analysis of the widely implemented current control techniques from literature and provides illustrations in the context of their implementation in a digital controller. The analysis presented in this paper can also serve as a foundation for more advanced versions of these control techniques as well as their combinations.
Highlights
O N account of its structural robustness, low-cost construction [1] along with the recent development in power converter technology [2], the ’Switched Reluctance Machine’ (SRM) drive is becoming a popular choice for increasingly wider array of applications [3]
Mechanism Scheduling of control accuracy performance index(Q) Estimation of flux linkage dynamics using state estimator (LQG) or inductance information alone (LQR) Online estimation of inductance using RLS Significant due to Jacobi linearized models used in state and parameter estimation Moderate, storage of Q function or inductance map is required Very large due to recursivenature of the algorithms involved in solving Hamiltonian at each time step
The paper focuses on the important aspects pertaining to fixed switching frequency current control of SRM
Summary
O N account of its structural robustness, low-cost construction [1] along with the recent development in power converter technology [2], the ’Switched Reluctance Machine’ (SRM) drive is becoming a popular choice for increasingly wider array of applications [3]. The developments pertaining to performance enhancement of an SRM drive have been recurrently reviewed Due to their prominence, the advances in torque control, radial force reduction and efficiency enhancement have received considerable attention in relation to the current control problem. The literature focusing on the review of fixed switching frequency current control of SRM drives encapsulates the operating principles of the controllers and limited performance evaluation. The interaction of these control laws with the unique non-linear character of the SRM has not received sufficient analytical treatment.
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