More Electrical Aircraft (MEA) which replaces the hydraulic and pneumatic power by electrical leads to reducing emissions fuel consumption.The MEA concept has led a growing use of starter/generator (S/G) system.Permanent magnet (PM) machines have been gaining interests for aircraft S/G system application over last few years.This is mainly due several advantages, including high density, efficiency speed ability.The shortcoming PM de-excitation problem in case failure, main issue...

With the development of more electric aircraft (MEA), higher demands for electrical energy are put forward in generation systems. Compared to constant frequency AC (CFAC) systems, speed drive (CSD) is eliminated and integrated starter/generator (SG) can be realized variable (VFAC) In this paper, an overview VFAC generators safety-critical applications presented, with a particular focus on key features requirements candidate starting control strategies. Wound rotor synchronous machines...

In this article, the advanced angle control (AAC) for active rectifier (AR) is proposed to improve output power of doubly salient electromagnetic generator systems. The AAC AR an optimization by turning on switches in advance with based angular position (APC) and pulsewidth modulation (PWM) ARs. operation principle ARs different from that inverters. phase inductance variation analyzed. flat top at load condition utilized accelerate commutation process enlarge current. unified analysis...

The doubly salient electromagnetic generator (DSEG) is gaining increasing attention in aircraft high voltage dc application due to its simplicity and de-excitation ability. However, the field winding inductance dc-link capacitor result a larger electrical time constant. dynamic response decelerated, leading difficulties meeting power standards. Minimum transient point tracking (MTPT) strategy based on trajectory with minimum current variation proposed for DSEG system an angular position...

A doubly salient electromagnetic starter/ generator (DSESG) system based on the bidirectional converter (BDC) is proposed, in this article. The BDC operated as an inverter starting mode and active rectifier (AR) generation mode. Compared to conventional DSESG system, which a diode or discrete inverter/rectifier unit (IRU), configuration simplified weight reduced. Since output voltage improved by angular position control (APC), field phase currents are redistributed. copper loss optimization...

Due to its high power density, the fractional slot concentrated winding permanent magnet synchronous machine (PMSM) is a competitive candidate for aircraft starter generator (SG) system. However, short circuit (SC) fault, especially turn-to-turn SC obstruct crux in aviation applications. The current can be restricted permissible level with higher reactance and injection mitigation method. self-inductance always leads lower density. So far, there have been no numerical criteria tradeoff...

A DC-link voltage regulation method is proposed based on capacitor energy control (CEC) for the doubly salient electro-magnetic generator (DSEG) system. Instead of tracking voltage, stored in set as target outer loop. proportional component that converts command output current into field developed between loop and The coefficient investigated mathematical model 12-8 pole DSEG, considering load speed variation. dynamic response DSEG system accelerated variation reduced with method....

In more electric aircraft, motor loads are applied onboard. When the is braking, regenerated energy needs to be absorbed avoid dc-link voltage variations. Two absorption methods proposed for generator based on diode rectifiers and starter/generator (SG) active rectifiers, respectively. power lower than other loaded power, both SG systems can absorb it by reducing output power. higher directly connected engine shaft, changing operation from generating motoring. The returned dc link without...

A high voltage DC (HVDC) parallel electric power system (EPS) is studied in this paper. The HVDC EPS provides uninterrupted onboard supply with better performance and higher reliability. Four different frameworks of the are studied. performance, complexity reliability four compared, "annular connection" structure selected as best framework for EPS. To avoid collapse EPS, fault detection protection designed. Several sensors, breakers relays mounted common faults analyzed corresponding...

In order to enhance the dynamic performance of output voltage regulation for wound rotor synchronous machine (WRSM) in aircraft variable frequency (VF) power system, fuzzy PI multi-loop control strategy is proposed. Traditional method not easy achieve and stability requirements VFAC generation system under wide speed, so algorithm, load current feedback speed are added excitation double loop. This new can compensate fluctuation by change initial parameters algorithm keep VF system. The...

The high voltage DC (HVDC) parallel electric power system (EPS) is one of the most promising structures for More Electric Air-craft (MEA), providing higher performance with less weight and energy loss. structure a typical HVDC EPS illustrated in this paper. method to share load current among generators key optimize performance. An "average current" scheme derived after comparing different sharing methods. To compare EPSs consisting 2 same level levels, are modeled supply quality including...

Doubly salient electromagnetic machines (DSEMs), which are characterised with fault tolerance, low cost, high reliability, and de‐excitation ability, gaining more attention in safety‐critical hash environment applications, such as the aircraft generation systems. Nevertheless, non‐linear strong coupled characteristics of flux linkage is obstruct crux DSEM modelling. The model critical part system model, foundation theoretical analysis, control strategy developing, stability analysis. This...

This paper introduces a system based on FPGA which controls multiple permanent magnet synchronous linear motors current, location and speed feedbacks. In the FPGA, several proportional-integral-derivative (PID) control units are settled. Each unit drives Hall Effect sensor to acquire of motor, raster position 2 current sensors value currents inputted motor. independently motor with 6 channels Pulse-Width Modulation (PWM) waves information from sensors. Meanwhile, communicate each other drive...

Considering the disadvantages of traditional PID controller in system tracking ability, anti-disturbance performance and a strong dependence on accurate model Permanent magnet synchronous linear motor(PMSLM), this paper proposed fuzzy two degree freedom(2DOF) Proportional-Integral-Differential (PID) control. Having studied equation PMSLM direct-quadrature(d-q) axis, not only gives mathematical vector control system, but designs 2DOF position controller. Through on-line adjustment parameters...

The doubly salient electromagnetic generator (DSEG) is a competitive candidate for more electric aircraft applications due to its high reliability. This paper proposes comprehensive loss management method based on current regulations with angular position control (APC) DSEG systems. components are divided and analyzed accurately determine the best conducting angle in APC minimized total loss. An efficiency regression model random forest (RF) also proposed address uncertainty of distribution...

The Doubly Salient Electromagnetic Generator (DSEG) is a promising candidate in aircraft generator application due to the simplicity, robustness and reliability. However, field windings armature are strongly coupled, which makes inductance characteristics non-linear too complex model. model with low precision also leads difficulties modeling analysis of entire Electrical Power System (EPS). A behavior level method based on modified Support Vector Machine (SVM) proposed. Finite Element...

Despite multimodal sentiment analysis being a fertile research ground that merits further investigation, current approaches take up high annotation cost and suffer from label ambiguity, non-amicable to high-quality labeled data acquisition. Furthermore, choosing the right interactions is essential because significance of intra- or inter-modal can differ among various samples. To this end, we propose Semi-IIN, Semi-supervised Intra-inter modal Interaction learning Network for analysis....

The shortcoming of permanent magnet (PM) machine is the de-excitation problem under fault condition, which a main issue for aircraft application. Thus, modeling different kinds faults accurately great importance. This paper presents comparison three methods dealing with stator winding open circuit (OC) and turn-to-turn short (SC) fault. are field-circuit coupling model (FCCM) method, finite element analysis based electrical (FEABEM) method mathematical (FEABMM) method. evaluation criteria on...