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The electrification of the modern aircraft and helicopters, by means of the adoption of electromechanical actuators (EMAs), represents a step in the direction of a more energy efficient transportation system. Simulation tools capable of analyzing EMAs performance and exploring different design configurations facilitate such a process. In this context, a virtual testing and analysis tool for EMAs,...
The more-electric aircraft concept is a fast-developing trend in aviation industry resulting in an increase in electrical loads fed by power electronic converters. Extensive simulations need to be done for ensuring power system integrity of the next generation commercial aircraft. Since the possible number of loads in an on-board power system can be very large, the development of accurate, effective...
The more-electric aircraft concept is a fast-developing trend in modern aircraft power systems and will result in an increase in electrical loads fed by power electronic converters. Finalizing the architectural bus paradigm for the next generation of more-electric aircraft involves extensive simulations ensuring power system integrity. Since the possible number of loads in an on-board power system...
This paper presents a dynamic phasor model of the autotransformer rectifier unit (ATRU) for the more-electric aircraft power system study. This model considerably reduces the complexity in modeling of an aircraft power system making it more practical to model the electrical power system for transient and stability analysis. The developed phasor model of the ATRU is based on the development of a non-switching...
This paper presents the small-signal stability analysis of AC-DC power system taking into account dynamics of electromechanical actuator (EMA). A dq modelling method is employed to predict unstable operation caused by possible variations in operating points and/or system parameters. The obtained theoretical results are supported by intensive simulations and verified experimentally.
In this paper a technique for analysing aircraft frequency wild power systems with constant power loads is developed and demonstrated. Power electronic based loads often behave as constant power loads, especially when feeding machine or actuator drives under current and speed control. The constant power (CP) loads can affect the stability of the power system. The problem is a particular issue in aircraft...
Power electronic based loads often behave as constant power loads, especially when feeding machine or actuator drives under current and speed control. The constant power loads (CPL) can affect the stability of the power system. The problem is a particular issue in aircraft power systems as the proportion of CPLs increases with the advent of the more-electric aircraft. This paper deals with stability...
The paper considers a previously unreported control approach for the control of off-shore DFIG-based wind farm grid with line commutated HVDC connection. The method is applicable for wind farms based-on doubly fed induction generators (DFIGs) or generators interfaced with full-rated power electronic converters. The paper focused on DFIG- based generation. The proposed control scheme allows each wind...
In this paper we consider the design for the offshore grid frequency control in a DFIG-based wind farm with LCC HVDC link connection. The control approach is based on using the grid frequency to regulate the HVDC DC-link current and hence control the power flow in the system. The dynamic equations are derived and grid frequency controller is designed. The mathematical analysis and the control design...
This paper considers the formal design for the grid frequency control in an offshore wind farm connected with LCC HVDC link. The control paradigm is based on using the grid frequency control to regulate the HVDC rectifier firing angle or DC-link current and hence control the power flow in the system. The dynamic behaviors of the system are verified by comparing the response from derived transfer functions...
The paper considers a control solution for integration of large offshore doubly fed induction generator based wind farms with a common collection bus, controlled by a static compensator, into the main onshore grid, using line-commutated high-voltage direct current connection. The paper's main focus is a mathematically grounded study of the power system interactions. That study produced an appropriate...
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