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A control method of a Matrix Converter to convert from four-wired three-phase voltages to three-wired single-phase voltages (single-phase MC) which replaces transformer in consumer side on micro-grid has been found [1]. In the single-phase MC, voltage drop and phase shift in its load voltage occur because the line current flows due to the input and output filters. So we proposed the load voltage control...
Five-phase Surface-mounted Permanent Magnet (SPM) machine offers the possibility of using the third harmonic of current to improve the average torque. In this paper, the use of third harmonic to compensate the pulsating torque and thus to reduce the vibrations transmitted to the shaft is explored. According to the multimachine theory, the torque of a five-phase star-connected SPM machine is distributed...
This paper proposes a new active damping method for LCL filter resonance. The proposed method employs a dual feedback loop of the capacitor voltage and the grid current. Based on the proposed method, non-minimum phase behavior can be avoided over a wide range of resonant frequencies. Co-design procedures for both the active damping loops along with the fundamental current regulator are introduced...
An adaptive nonsingular terminal sliding mode (NTSM) tracking control scheme based on backstepping design is presented for Micro-Electro-Mechanical Systems (MEMS) vibratory gyroscopes in this paper. The nonsingular terminal sliding mode controller is designed based on backstepping strategy to eliminate the singularity, while ensuring the control system to reach the sliding surface and converge to...
This paper presents the rotor field oriented control (RFOC) of an induction motor supported by magnetic bearings. The shaft of the motor is supported by two radial and one axial magnetic bearings. The rotor was inserted at the center of the shaft, which will operate as motor as well as generator, and at the shaft extremity is coupled a small turbine. The mechanical modeling and assembly are presented...
In order to drive the existing induction motors effîciently, the energy loss should be minimized during its operation. It has been reported that the analytically designed optimal torque and the rotating speed trajectories minimize the energy loss of the induction motor (IM) drive system under given drive conditions. In the reported analytical methods, however, the iron loss and other un-modeled loss...
This paper is concerned with the problem of the robust sampled-data H∞ control for an offshore steel jacket platform subject to the self-excited wave force and the external disturbance. First, by using the input delay method, the corresponding closed-loop system with the sampling measurements is transformed into a continuous-time system. Then, based on a Lyapunov functional, the H∞ performance is...
In this paper, a decentralised control approach for an innovative 5 MW wind turbine with a hydrostatic transmission is presented that covers the whole range from low to very high wind speeds. An active damping of tower oscillations is achieved by using the pitch angle as control input. An elastic multibody system is employed to derive a control-oriented model for the first tower bending mode, which...
This paper studies a modified DC-DC boost converter where the input inductance has been replaced by an LCL filter. The voltage conversion ratio of the proposed converter is equivalent to the conversion ratio of a conventional boost converter, and it has only one active switching device. A controller is proposed to regulate the output voltage to a given reference with guaranteed reduced input current...
Widespread deployment of Voltage Source Inverters (VSI-s) in high penetration applications like distributed generation, UPS and stand-alone renewable energy conditioning imposes stringent demands on reliability and output voltage regulation. Reported literature offers numerous solutions for output voltage regulation, which includes twin aspects of command tracking and output impedance control. Most...
This paper presents an active damping method in natural frame for a three-phase voltage source inverter with LCL filter. The proposed method is based on the pole placement technique via Ackermann's formula. This approach is used to obtain the proper sliding surface vector coefficients to emulate a virtual resistor in series with the capacitor filter. Besides a well-known method in the literature have...
A direct grid-current control method is proposed to attenuate low-order current harmonics in three-phase LCL-filtered grid-connected inverters. This method allows the use of a distorted reference current, thus the reference can be generated directly from grid voltage or by a simple phase-locked loop (PLL). It is found that the direct control is necessary for effectively attenuating the current harmonics...
This paper presents a novel two channel control law for high transparency teleoperation under time delay with guaranteed delay independent L2 stability. Four channel controllers have long been known to provide transparent teleoperation when time delay does not exist on the communication channels. However under time delay, a trade-off between delay and transparency must be made to make the system stable...
Compared with the traditional microgrid, a smart transformer (ST)-based microgrid shows advantages in terms of higher efficiency, increased hosting capacity, and enhanced reliability. However, this novel microgrid presents challenges because of the complex resonances within the system and the interactions between ST and power converter-based distributed energy resources (DERs). Both the ST and DERs...
This paper presents a comparison of two alternative control structures for an active oscillation damping of truck drive trains. Uncomfortable oscillations in the drive train may occur in phases when the dry clutch is slipping. The negative friction coefficient of the clutch lining could cause an undesired judder, which leads to a severe driver discomfort. At first, a control-oriented model is derived...
This paper deals with the energy management problem of a Proton Exchange Membrane Fuel Cell (PEMFC) with Supercapacitor (SC) hybrid system. An innovative Interconnection and Damping Assignment Passivity-based Controller (IDA-PBC) with multi-equilibrium states is proposed in this paper. The hybrid system is first modeled as a Port-controlled Hamiltonian (PCH) system by considering the PEMFC and the...
The strain on modern electrical power system operation has led to an ever increasing utilization of new Information Communication Technology (ICT) systems to enhance the reliability and efficiency of grid operation. Among all the "ICT-intensive" Smart Grid applications, the utilization of PMU data to improve power system damping for inter-area oscillations has attracted many attentions....
Large scale wind energy conversion systems (WECSs) are gradually required to participate in power system voltage/frequency regulation. As a result, output characteristic of the WECS is changing from traditional current source to voltage source and thus affects small-signal stability (SSS) of power system. This paper investigates SSS of power system with WECS voltage/frequency ancillary control. Through...
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