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Modular multilevel converter (MMC) is a relatively new and promising topology for HVDC systems. HVDC systems should remain connected during grid faults and isolate the fault. This paper studies the dynamic performance of transformer-less MMC integrated HVDC systems during unbalanced conditions and asymmetrical grid faults. It proposes a new control technique to improve unbalanced system's performance...
This paper proposes a discrete-time sliding mode current observer (DSMCO) that relies only on the measure of the voltage between a distribution static compensator (DSTATCOM) and a self-excited induction generator (SEIG). Thus, the proposed observer reduces the overall cost of the voltage regulator system, however, the current sensor's cost is significant. The proposed algorithm is also adaptive, because...
The stacked multiceli converter is one of the promising breeds of multilevel converters among the other several modified configurations presented in the literature. The reduced stacked multiceli converter is the most advanced one with less number of power switches and flying capacitors leading to a reduced size and cost. This paper proposes a reduced stacked multiceli converter based STATCOM to control...
This paper deals with the measurement of the magnetic properties of steel and other soft magnetic, electrical conductive, materials at high temperatures up to the Curie temperature and slightly above. At first the theory of measuring the magnetic properties at room temperature is described on the basis of the ring core method and the Epstein method, since aspects of both are used in the developed...
Power hardware-in-the-loop (PHIL) is an important tool for testing and verifying various aspects of systems level research. It provides a realistic assessment of how a device will interact under various conditions and environments, allowing the testing process to truly vet the apparatuses before full scale deployment. Crucial to the PHIL concept, is the hardware-in-the-loop interface. Interfaces must...
This paper presents the precise measurement of the stator inductance as well as the stator resistance, using an inverter. Precise measurement results are created, although the actual output voltage of the inverter is not known exactly. This paper analyzes the different effects of an output power stage, and how they degrade the quality of the output voltage. This knowledge is used to cancel out this...
The effective efficiency of a photovoltaic system is strongly affected by varying factors such as partial shading. The centralized power conversion has limitations to mitigate that problem. As a possible solution the benefits of the distributed power conversion are explored and as an integral part of distributed power conversion an intra-module DC-DC converter is presented here to implement at substring...
This paper investigates a new approach to develop and implement a virtual flux oriented control (VFOC) for the front-end three phase bidirectional voltage source converter (VSC) by adapting the principle operations of voltage oriented control (VOC) and power estimation used in virtual flux direct power control (VFDPC). The proposed VFOC operates with minimal number of sensors by avoiding the used...
This paper presents the design, characterization, and modeling of a power electronic converter based around Silicon Carbide (SiC) MOSFETs. A practical characterization procedure is proposed which takes a circuit-level approach, as opposed to a device-level approach, using only the power electronic circuit and no additional test circuitry. The converter circuit is general enough that it can represent...
The second-order-generalized-integrator frequency-locked loop (SOGI-FLL) is typically employed to synchronize with the grid in the single-phase grid-connected converter. The SOGI creates two orthogonal signals from an input grid voltage, and estimates the magnitude while the frequency locked-loop identifies the grid frequency. If there is a DC component in the grid voltage due to the measurement process,...
It is well-known that in the area of encoderless control methods for AC-drives a single approach is not capable to cover all speed ranges and all types of machines. Therefore, a combination of several methods is necessary. Especially in the case of electrically excited synchronous machines, the methods proposed for the low speed region and for the detection of the initial rotor position fail for many...
Large lithium-ion battery systems rely on battery monitoring and management systems to ensure safe and efficient operation. Typically the battery current, the cell voltages, and the cell temperatures are monitored. This paper describes the use of gas sensors in large lithium-ion battery systems in addition to conventionally used means of battery monitoring. An undetected electrolyte leak in a cell...
A robust power sharing controller for single phase inverter has been developed for the microgrid emergency condition where it is islanded from the main grid, and no communication available. In order to design a robust controller, the Glover McFarlane H infinity synthesis method is used. This design method guarantees the robustness of the droop controller and it allows to specify the settling time...
The single-stage flyback power factor correction (PFC) converter is well applied in medium and low power occasion such as adapters or LED drivers. Usually, the flyback PFC converter is preferred to operating in boundary conduction mode (BCM) for achieving high power factor (PF) and high efficiency at the same time. However, the conventional BCM control scheme such as input voltage tracking control...
This paper deals with a new EMG based man-machine interface called VAMPIRE-BAT/WASPS. It is not only a high performance wireless EMG measuring instrument but also a stimulant device using high voltage electricity. Therefore, we can build bi-directional man-machine interface using VAMPIRE-BAT/WASPS. One of its interesting features is "pin-point feedback" that means the electric stimulation...
This paper presents a new, simple and low cost method for fast short circuit protection of IGBT modules. The principle of the method is to measure the voltage across the inductance between the power-emitter and the auxiliary-emitter. Moreover, by modulating the gate-signal, the new method reduces the gate emitter voltage Vge in order to limit the short circuit current and allows the semiconductor...
The aim of this paper is an investigation of an extended Kaiman filer (EKF) based on a model in phase coordinates for sensorless control of an interior permanent magnet synchronous motor (IPMSM) with higher harmonics in the motor flux. The challenge for the EKF is to minimize its execution time especially for model in phase coordinates. This is achieved by using state space model of the drive with...
A particle filter based power system dynamic state estimation scheme is presented in this paper. The proposed method can be considered as an alternative to the other schemes which are mostly based on the Kaiman Filter. The particle filter approach can be used to estimate the states of nonlinear systems which are subjected to both Gaussian and non-Gaussian noise. Furthermore, the presented scheme has...
This paper presents a new method for balancing currents of two or more parallel-connected IGBTs during an on-state of the switches, wherein each semiconductor is controlled by its own gate unit. Moreover, the imbalance of the collector currents are estimated by measuring the voltage across the inductance between the power-emitter and the auxiliary-emitter of the semiconductor. The imbalance control...
Among the wide range of applications that power supplies are able to cover, the Particle Accelerator based Light Sources are one of the most demanding. In the specific case of the Elettra Storage Ring, a Synchrotron Radiation Facility operating since 1993, magnet power supplies with other critical devices are determining the quality of the photon beams and overall accelerator uptime. Because of that,...
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