Comparison of two electric braking methods with regenerative capability of brushless DC machine and their four-quadrant operation

Brushless DC machine (BLDCM) has found wide applications in many fields. How to brake electrically with regeneration capability for BLDCM is a new subject of great concern. This paper compares two emergent hybrid electric braking schemes recently. One is a “plugging+ regenerative” braking scheme, which blends plugging with regenerative braking method. The other is “dynamic+ regenerative” braking scheme, which combines dynamic braking with regenerative braking method. All of the problems involved in these two hybrid braking schemes such as switching laws of inverter, close-loop system implementation and their four-quadrant operation are investigated in detail. Effectiveness and validity of the proposed strategies are justified through simulation. Many important conclusions are drawn.