Asymmetric Current Control Strategy for Doubly Salient Electromagnetic Generator Based on Controlled Rectifier

Compared with the uncontrolled rectifier, the controlled rectifier can further increase the output power of the doubly salient electromagnetic generator (DSEG). This paper proposes an asymmetric current control (ACC) strategy for the three-phase bridge controlled rectifier. By setting different turn on and turn off angles for the upper and lower bridge arm switches, the asymmetric control of the positive and negative currents is realized, the commutation overlap area is reduced, and the positive current value is further increased, thereby increasing the power generation capacity of the generator. Finally, it is verified by experiments that compared with the angular position control (APC) strategy, this strategy can further improve the output power of the generator, and effectively reduce the excitation current under the same load, thereby alleviating the problem of excitation current saturation at low speeds, broadening the generator speed range and reducing the excitation power.