This paper presents first an overview of the well-known voltage and current dc-link converter topologies used to implement a three-phase PWM ac-ac system. Starting from source inverter rectifier, basics space vector modulation are summarized. Based on that, topology indirect matrix (IMC) its gradually developed back-to-back by omitting capacitor. In next step, conventional (direct) (CMC) is introduced, relationship between IMC CMCs discussed in figurative manner investigating switching...

The More Electric Aircraft concept offers many potential benefits in the design and efficiency of future large, manned aircraft. In this article, typical aircraft electrical power systems associated loads are described as well exciting challenges for aerospace industry. importance electronics an enabling technology step change is considered, examples system designs discussed.

This paper introduces the methodology and results of a comprehensive comparison direct matrix converter (MC), an indirect MC, voltage dc-link back-to-back for 15-kW permanent magnet synchronous motor drive. The involves investigation passive components, including EMI input filter, required silicon chip area defined maximum admissible thermal loading power semiconductors, total losses and/or achievable efficiency, prediction resulting volume weight and, finally, tradeoff study between volume,...

This letter presents a fault detection method for modular multilevel converters which is capable of locating faulty semiconductor switching device in the circuit. The proposed based on sliding mode observer (SMO) and model half-bridge, approach taken to conjecture location fault, modify SMO accordingly then compare observed measured states verify, or otherwise, assumption. technique requires no additional measurement elements can easily be implemented DSP microcontroller. operation...

This paper presents an overview of technology related to on-board microgrids for the more electric aircraft. All aircraft use isolated system, where security supply and power density represents main requirements. Different distribution systems (ac dc) voltage levels coexist, converters have central role in connecting them with high reliability density. Ensuring safety a limited redundancy is one targets system design since it allows increasing challenge often tackled proper load management...

Droop control has been widely applied in dc microgrids (MGs) due to its inherent modularity and ease of implementation. Among the different droop methods that can be adopted MGs, two options have considered this paper: <italic xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">I</i> – xmlns:xlink="http://www.w3.org/1999/xlink">V</i> droop. controls current depending on voltage while regulates based output current. The paper proposes a comparative study...

This paper proposes a new methodology for automated design of power electronic systems realized through the use artificial intelligence. Existing approaches do not consider system's reliability as performance metric or are limited to evaluation certain fixed set parameters. The method proposed in this establishes functional relationship between parameters and metrics, uses them basis optimal design. first step framework is create nonparametric surrogate model converter that can quickly map...

The idea of electric propulsion for transportation is not new; indeed, the first cars, nearly 200 years ago, were electric. However, our dependence on fossil fuels over last 100 now being questioned, and as a global society, we are moving toward more-electric solutions. Electric aircraft part this trend, either all-electric or through large variety proposed hybrid systems. This article considers some these systems, their technological requirements, ongoing research development in motors...

Aviation is a significant contributor to greenhouse gas (GHG) emissions in the transportation sector. As adoption of electric cars increases and GHG due other modes transport decrease, impact air travel on environmental pollution has become even more significant. To reduce maintenance, ensure cheaper convenient flights, industry academia have directed their efforts toward aircraft electrification. Considering various types aircraft, several frameworks been proposed: more-electric (MEA),...

This paper presents a novel control system for the operation of switched reluctance generator (SRG) driven by variable speed wind turbine. The SRG is controlled to drive energy conversion (WECS) point maximum aerodynamic efficiency using closed loop power output. In medium and low range, phase current regulated pulsewidth-modulation (PWM) magnetizing voltage. For high speeds single pulse mode. order interface grid (or ac load) voltage-source PWM inverter used. A 2.5-kW experimental prototype...

A matrix converter is an ac-ac power topology that has received extensive research attention as alternative to traditional ac-dc-ac converter. able convert energy from ac source load without the need of a bulky and limited-lifetime energy-storage elements. The indirect three-level sparse (I3SMC) new this family can synthesize voltage in order improve output performance terms reduced harmonic content. This paper discusses operating principles space-vector-modulation scheme for topology....

A different approach to perform the control of an induction machine fed by a matrix converter (MC) is presented in this paper. The proposed technique based on predictive and effectively controls input output variables power converter, as expected from MC. method allows use all valid switching states, including rotating vectors that are not considered most techniques, space vector modulation or direct torque for machines MCs. Experimental results show excellent performance approach, with...

This paper presents a new control method for matrix-converter-based induction machine drive. A discrete model of the converter, motor, and input filter is used to predict behavior torque, flux, power The switching state that optimizes value quality function, as evaluation criterion, selected applied during next discrete-time interval. Experimental results confirm proposed strategy gives high-quality factor with fast dynamic response. key implementation issues are analyzed in depth give an...

Multilevel converters have received increased interest recently as a result of their ability to generate high quality output waveforms with low switching frequency. This makes them very attractive for high-power applications. A cascaded H-bridge converter (CHB) is multilevel topology which formed from the series connection cells. Optimized pulse width modulation techniques such selective harmonic elimination or mitigation (SHM-PWM) are capable preprogramming profile waveform over range...

This paper describes an experimental tool to evaluate and support the development of fault-tolerant machines designed for aerospace motor drives. Aerospace applications involve essentially safety-critical systems which should be able overcome hardware or software faults therefore need fault tolerant. A way achieving this is introduce variable degrees redundancy into system by duplicating one all operations within itself. Looking at drives, multiphase machines, such as brushless dc are...

This paper proposes an improved voltage regulation method in a multisource-based dc electrical power system the more electric aircraft. The proposed approach, which can be used terrestrial microgrids as well, effectively improves load sharing accuracy under high droop gain circumstance with consideration of cable impedance. Since no extra communication line and controllers are required, it is easily implemented also increases modularity reliability. By using transmission losses reduced...

This paper presents a fault detection and isolation (FDI) method for open-circuit faults of power semiconductor devices in modular multilevel converter (MMC). The proposed FDI is simple with only one sliding-mode observer (SMO) equation requires no additional transducers. based on an SMO the circulating current MMC. An device detected when observed diverges from measured one. A located by employing assumption-verification process. To improve robustness method, new technique injection term...

There has recently been a major change in the design of aircraft. Electrical systems are being used applications, which have traditionally powered by hydraulic or pneumatic sources. The Boeing 787 and Airbus A380 both significantly larger electrical than any previous aircraft this led to wealth technology developments. now use for actuation systems, wing ice protection, environmental control fuel pumping. These new helping make future more efficient quieter, improving environment everyone....

In electrical machines, a higher torque/force density can usually be achieved by increasing the current in windings. However, resulting increase copper losses leads to temperatures coils, particularly center of slots where thermal resistance ambient/cooling surfaces is highest. this paper, novel, simple technique presented which conductivity path between slot and cooling arrangement created, thus heat flow away from center. A lumped-parameter model used along with finite-element analysis...

This paper deals with the design, control, and implementation of a three-phase ground power-supply unit for aircraft servicing. Instead classical back-to-back converter configuration, direct ac-ac (matrix) has been used as power conditioning core supply, working in conjunction input output <i xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">LC</i> filters. An optimized control system ABC frame employing repetitive controller successfully implemented,...

This paper focuses on the analysis of a single dc bus multigenerator electrical power system (EPS) for future more electric aircraft. Within such paradigm, proposes detailed control design procedure and provides stability based derivation output impedance source subsystem input load subsystem, including dynamics. The characteristic is analyzed properties EPS are investigated when supplying constant loads. In addition, highlights impact number parallel sources sharing ratio. theoretical...

HVDC transmission systems are becoming increasingly popular when compared to conventional ac transmission. voltage source converters (VSCs) can offer advantages over traditional current converter topologies, and as such, it is expected that VSCs will be further exploited with the growth of This paper presents a novel modular multilevel hybrid VSC intended for market. The concept operation described based on steady-state ac-dc power balance. Techniques dynamic control, enabling active...