Abstract
Variable frequency power generation systems have been adopted for modern aircraft power systems, thus, a new generator control unit (GCU) must be designed to regulate the output voltage and obtain high quality power supply under a wide frequency range from 360 Hz to 800 Hz. In this paper, a dual digital signal processor (DSP) structure-based GCU was proposed. Multi-loop control structure was adopted with the controller parameters varying adaptively at different working conditions to obtain better performance. Different root-mean-square (RMS) calculation algorithms have been compared and the final RMS calculation scheme was determined to realize the trade-off between accuracy and computing efficiency. Experimental results show considerable performance improvements of the generator output voltage under various operating conditions with the proposed GCU.
Highlights
With the rapid development of aviation technology, the concept of more electric aircraft (MEA)becomes a reality
The power supply system is increasingly becoming an important factor that restricts the innovation of aircraft technology, which develops from constant frequency (400 Hz) to variable frequency (360–800 Hz), and from low voltage (115 V alternating current (AC), 28 V direct current, (DC)) to higher voltage (230 V AC, 270 V DC)
A traditional generator controller unit (GCU) uses analog devices for voltage regulation and protection execution, and is unable to be directly applied to the new high voltage variable frequency power supply system, which proposes an urgent need for the development of digital generator control unit (GCU)
Summary
With the rapid development of aviation technology, the concept of more electric aircraft (MEA). A traditional generator controller unit (GCU) uses analog devices for voltage regulation and protection execution, and is unable to be directly applied to the new high voltage variable frequency power supply system, which proposes an urgent need for the development of digital GCU. For synchronous generator voltage regulation controller structure, there is a predictive controller based on the motor model, which achieves stability and better performance [8]. In [14,15], a digital automatic voltage regulator was developed considering sensor failure with uncertainty analysis All these publications only focus on constant frequency three-stage generators, which could not satisfy the requirement proposed by variable frequency three-stage generators. This paper develops a digital GCU for three-stage synchronous generators with a wide range of operating frequency by improving the existing control algorithm. The inner loop compensates for the load current, so as to reduce the influence of the load current, enabling the regulator to adapt to a larger scope of working frequency and having better steady and dynamic performance
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