A variable structure space voltage vector controlled switched reluctance flux vector drive

Through simulation and experimental investigation this thesis shows that (i) the switched reluctance motor is not different from any other motor in energy conversion theory but the difference is only in the structure and the operating characteristics; (ii) under high loads or high speeds the relative phase angle of the current with respect to the rotor pole must be advanced; (iii) the kinetic energy in the motor can be quickly returned to the d.c. link source or be transferred to other phase windings by the regenerative operation. A synchronous singly-excited control scheme is introduced to the switched reluctance motor. By this technology, a conventional current chopper can be used but the operating phase angle of the excited phase current must be limited. This approach makes the traditional switched reluctance drive become a high performance vector drive but a complex coordinate transformation is unnecessary making the implementation very simple. For multiply excited operation and for high power requirements, in order to achieve the sliding mode control of total phase power, a space vector controlled split-link converter is accomplished. A sliding mode speed controller with d.c. link power feedforward is added to the variable structure space vector controlled split-link converter to achieve a robust servo drive. The proposed switched reluctance drive can achieve fast and robust servo performance even under a high load and highly dangerous electric braking conditions.