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This paper presents a single phase dynamic voltage restorer (DVR) topologies to mitigate voltage sag. A single phase matrix converter (SPMC) is presented as a direct ac-ac converter replacing the voltage source inverter in a typical DVR system. A simulation was done using Matlab/Simulink software to observe the SPMC performance towards mitigating the voltage sag. In this simulation a single line to...
This paper presents the theoretical assessment of conversion losses for 4H-SiC based power devices over 10 kV. A set of empirical and analytical equations are developed to predict the losses at different temperatures and over wide blocking voltage range. Basic data for empirical equations in terms of RON and knee voltage of bipolar devices (i.e., IGBTs, PIN dioode) is also compared with the experimental...
Solid-state-transformer technology pushes the specifications of electric transformers in the high-power medium-frequency range. This combination results in larger-sized transformers operating at higher frequencies whereby parasitic phenomenon should be carefully accounted for. This paper presents an analytical description of the limiting factors and the connection between frequency/power rating and...
The handling of weak networks with asymmetric disturbances implies the accurate handling of the second harmonic component appearing under unbalanced networks. This paper proposes a two-step approach using classic vector control for operating the current controller from the network disturbance. First, both voltage and current must be described in the positive and negative sequence with a proper decoupling...
The paper discusses the problem of state/rotor flux angle estimation for the induction motor (IM) drive and presents a series of Sliding Mode (SM) observers that are constructed using compound manifolds. The observers use the model of the IM in the stationary reference frame — their behavior and estimation properties are discussed. Observers with compound manifolds have not been widely investigated...
When distributed generators are connected to the grid, it is required that the system withstand the voltage dip caused by the grid failure. This is known as the low voltage ride through (LVRT). One of the effective choices to realize the LVRT is a grid connected inverter with virtual synchronous generator (VSG). This paper present a VSG control with capability for LVRT. By using this control, the...
This paper presents a regulation characteristics of proposed fast response digitally peak current controlled dc-dc converter. In the proposed method, the peak current can be detected in real time by using an inexpensive voltage controlled oscillator (VCO) and a programmable delay circuit. In a simulation and an analysis results, it is revealed that a proposed circuit has a sufficient resolution to...
In this paper, bi-directional DC-DC converter is analyzed using a seamless dynamic model with an independent voltage source and an independent current source, which polarity depends on the direction of the power flow. In the seamless dynamic model, the independent voltage source represents a battery and an independent current source represents the load or energy source. A small signal model is derived...
This paper describes the method for the control of the input power factor for a variable voltage AC/DC converter under different output voltage conditions. The proposed PWM strategy also suppresses the output voltage ripple with a reduced number of commutations. The proposed control method is verified by the experimental results.
This paper proposes a deadbeat control system for the output LCL filter in a grid-connected inverter with a settling time of three sampling periods. Unlike the conventional analysis, the proposed control algorithm is derived in the descritised time-domain instead of the s-domain. In order to bring the robustness about the grid voltage distortion or the inaccurate inverter with non-linearity between...
The system analysis and circuit implementation of a three-phase voltage-doubler soft-switching active power filter (VDSSAPF) comprising four main switches and four auxiliary switches is proposed in this paper. All main switches in the proposed VDSSAPF operate at zero-voltage-switching (ZVS) turn-on, while the auxiliary switches operate at zero-current-switching (ZCS) turn-off. The reduction in the...
The implementation of power converter for wind generator controlled by digital signal processor is presented in this paper. The proposed system is composed of a wind generator, lead-acid batteries, a three phase ac/dc full-bridge semicontrolled boost rectifier, a dc/dc single-ended primary inductance converter (SEPIC), a bi-directional converter and a full-bridge inverter. The wind generator is used...
The modular multilevel matrix converter (MMMxC) applied to a low frequency ac (LFAC) transmission system is investigated. The LFAC (1 Hz ∼ 20 Hz) has some advantages compared to conventional ac and dc transmission systems, such as the increase of current-carrying capacity of power cables due to reduction of capacitive charging current, and better fault protection due to existence of zero current points...
In this paper, the design of dimmable LED lighting driving circuit for battery power source is proposed. In this research, Class-E resonant converter is the electricity power conversion circuit for achieving high efficiency. By applying multiple series transformers with three windings to driving multiple LED lighting lamps which can improve current uniformity and increase operating reliability. Furthermore,...
We propose a novel single to two-phase matrix converter (iS2MC) for driving a symmetrical two-phase induction motor. Matrix converter (MC) technology is already used in industrial applications, but is limited to three-phase induction motor with three-phase power line. The iS2MC, which consists of 8 bi-directional switches, enables a two-phase induction motor to be driven by single-phase power line...
The paper discusses the problem of speed and state estimation for the induction motor (IM) drive and presents a double-manifold Sliding Mode observer. This is obtained by adding extra feedback terms to a single-manifold observer design. Both designs are based on the model of the IM in the stationary reference frame. The observer uses compound manifolds which are constructed as a combination of the...
In order to drive the electric machines using the motors efficiently, the energy loss should be minimized during its operation. It has been reported that the design methodology of the optimal torque and rotating speed trajectories to minimize the energy loss of the induction motor (IM) drive system when the operation time, rotating speed, and rotational angle are given as drive conditions. However,...
This paper presents two topologies to connect HVDC offshore wind farm into the grid, the offshore part consist of five units; in the first topology, each unit contains a permanent magnet synchronous generator (PMSG) connected to a three level neutral point clamped converter (3L-NPC) to control the generator speed by using a maximum power point tracking (MPPT) control. The offshore platform consists...
This paper proposes a novel sensor-less maximum power point tracking (MPPT) algorithm for Photovoltaic (PV) systems. The method is based on dividing the operating time into several intervals in which the PV terminals are short circuited in one interval and the calculated short-current of the PV is obtained and used to determine the optimum operating point where the maximum output power can be obtained...
In this paper, a new design method of vibration suppression controller for multi-mass (especially, 6-mass) resonance systems is proposed. The proposed method is possible to suppress the mechanical vibrations of all modes. The controller consists of a modified-PI-PD controller for speed loop and a PI controller for current minor loop. The seven controller gains are determined by Coefficient Diagram...
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