Control method considerations for DC-DC converters in power buffer applications

The field population of power electronics loads continues to grow. Most such loads, including motor drives, computer power supplies, and even compact fluorescent lighting "isolate" the load dynamics from the utility grid. When isolated these loads enforce local constant power behavior, which can de-stabilize a weak power system. One method to mitigate the effects of constant power loads is the use of active dynamic power buffers. This paper reviews the power buffer concept, and presents DC-DC converter control methods and considerations to implement an active power buffer.