A Droop Control Based Three Phase Bidirectional AC-DC Converter for More Electric Aircraft Applications

Abstract

This paper addresses the design and implementation of a droop controlled three phase bidirectional AC-DC converter for more electric aircraft (MEA) applications. A unified control strategy using a droop characteristic is presented to achieve the bidirectional power flow between the AC and DC source while maintaining a stable DC output voltage. Based on the rigorous control design, the converter is capable of operating over a wide frequency range with a unity power factor. The key findings obtained from the theoretical analysis are confirmed by simulation studies and further validated by a scaled down laboratory prototype. The practical results show good performance of the bidirectional converter and demonstrate the effectiveness of the proposed control strategies.

Starting Pulse Vibration Torque Analysis of Aviation Variable Frequency Asynchronous Motor Based on Low-Frequency Step-Down Starting Methods

“…It is assumed that the constant power load is driven, and the motor starts with load at the same time for meeting k st the design requires k st = 1.2~1.4. Coupled with the (15) and (19), (21) and (25), (27) and (31), respectively. The simulation results are shown in Table 3.…”

“…The variable frequency power supply system of 115 V/360~800 Hz is applied by the more electric aircraft [9][10][11][12]. Compared with constant frequency power supply, the performance of equipment and system should adapt to this change [13][14][15][16]. For the asynchronous motor powered by the variable frequency power supply, the operation characteristics change with the power frequency variation.…”

Stability and reliability of low voltage hybrid AC-DC microgrids power flow model in islanding operation

“…Hybrid AC-DC microgrid is a microgrid that combines DC and AC sub microgrid, both sub microgrids are connected by an interlinking converter [6,[8][9]. The advantages of hybrid AC-DC microgrids, in general, can be summarized as follows [5][6][8][9][10][11][12][13]: Increase installed power capacity; reducing the use of power electronic equipments: converter, Power Factor Correction (PFC); improve power quality on microgrid AC, because DC load will be directly connected to DC source so that it doesn't cause harmonic pollution. Not only the advantages but also there are weaknesses of this system, one of which is power condition.…”

Power management and control coordination strategy for autonomous hybrid microgrids

“…This has numerous adverse effects that reduce the life of the equipment. Nevertheless, these effects are avoidable through a combination of the conventional droop loop and the virtual impedance loop [18].…”

“…Several control and normalisation techniques are developed for controlling and managing the bidirectional power flow. Extensive research has been devoted to new techniques of modifying droop control methods to compare the voltage at the DC bus and the frequency at the AC bus [3, 18–21]. The common concept of such methods is that the transferred active power from one SMG to another is based on the surplus power of each SMG.…”