Design of Electrical Accumulator Unit (E AU) Using Ultracapacitor

摘要

Electromechanical actuator (EMA) loads are always highly dynamic for electric aircraft (MEA) applications. Occasionally, the loads need large power to operate and may actually work in the regenerative mode, sending large power back to the bus. This will make generator voltage regulation difficult. In addition, the recessive regenerative energy needs to be stored and used rather than burned through resistors. An electrical accumulator unit (EAU) has been recently proposed, analogous to the hydraulic accumulator unit (HAU) for hydraulic systems. In this paper, the design of an EAU based on an ultracapacitor is presented. A bidirectional boost converter with double arms connects the ultracapacitor and the DC bus. Two PI controllers are used to regulate the PWM duty cycles of the arms, monitoring the DC bus voltage and the ultracapacitor voltage, respectively. Simulations show that the designed EAU can effectively control both the DC bus voltage and ultracapacitor voltage for highly dynamic EMA loads by properly tuning the proportional and integral gains of the controllers