118 108 To 180 118 120 108 110 100 90 80 80 195 130 150 75 0 -75 -150 65 0 -65 -130 -195 10.8 10.9 11.0 11.1 11.2 11.3 11.4 11.5 11.6 11.7 11.8 Figure 13. The ac load voltage regulation characteristics of the ac/dc hybrid generation system. 560 Electric Actuation dc Bus Voltage (V) 545 544 Main dc Bus Voltage (V) Conclusions In this article, the option of using an induction generator for the distributed EPS of MEA is explored. Two new electrical power generation and distribution architectures Time (s) 543 542 541 540 539 538 537 536 535 ac Load Phase A and B Voltage (V) 130 ac Load Voltage (Vrms) ... 140 commanded to alternate between drawing 25-kW power from the APU generator and sending 25-kW regenerative power back as a square waveform, from 1.5 s to 3.0 s. The load of the main dc bus is changed from 75 to 65 kW at 2.25 s. The main dc bus and electric actuation dc bus voltages of the system are shown in Figure 14(a) and (b), respectively. The bidirectional load toggle on the electric actuation bus at 1.5, 2.0, and 2.5 s did not affect the voltage regulation on the main dc bus. The input power of the main dc bus and electric actuation dc bus, as well as the output power of the APU generator, is presented in Figure 15(a)-(c). Clearly, the APU generator successfully supplied/ absorb ed the highly dynamic power demand/regeneration from the electric actuator bus without disturbing the power delivery to the main dc bus. 1 1.2 1.4 1.6 1.8 2 2.2 2.4 2.6 2.8 Time (s) (a) 3 555 550 545 540 535 530 525 520 1 1.2 1.4 1.6 1.8 2 2.2 2.4 2.6 2.8 Time (s) 3 (b) Figure 14. (a) The main dc bus voltage and (b) the electric actuation dc bus voltage characteristics of the APU for the power generation and management system. 36 I E E E E l e c t r i f i cati o n M a gaz ine / DECEMBER 2017