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Droop scheme has been widely applied to the control of Distributed Generators (DGs) in microgrids for proportional power sharing based on their ratings. For standalone microgrid, where centralized management system is not viable, the proportional power sharing based droop might not suit well since DGs are usually of different types unlike synchronous generators. This paper presents an autonomous droop...
This paper proposes an application of improved synchronous reference frame (ISRF)-based voltage sag detection in voltage sag compensation system. The ISRF-based voltage sag detection presents the fast detection time that is suitable to use in voltage sag compensation system. The proposed voltage sag compensation system consists of 1) ISRF-based voltage sag detector, 2) static transfer switches (STSs),...
This paper investigates the performance of a 150 W single-phase current-source grid-connected inverter for photovoltaic (PV) applications. The constant-current source is realized using a large DC link inductor and the inverter is implemented using a single boost switch, a H-bridge inverter and a CL output filter. Although the DC link inductor causes the inverter to be less efficient than an equivalent...
This paper extends research on single phase microgrids [1] to implement a Virtual Output Impedance (VOI) in a three phase system utilising cascaded PI voltage and current control in the Rotating Reference Frame (RRF). The paper proposes two methods for the selection of VOI values; a selection surface and a summation approach. SABER simulations and dSPACE hardware results are provided for a two inverter...
In recent years a strong emphasis of community to environmental protection is visible. This resulted in intensification of research focusing on finding new technologies to remove pollutants from the environment. One of the very promising technology in many technological processes where removing gaseous, harmful substances from the atmosphere is necessary is the non-thermal plasma (NTP) technology...
This paper represents the prototype inverter, which is designed for 48 V belt-drive unit with enhanced hybrid functionalities. A pure electric drive mode for low speed range is possible in addition to the classical hybrid operation modes like internal combustion engine start, recuperation and boosting. Electric machine and inverter are combined in a compact drive unit where the inverter is axially...
The demand for high efficiency and higher power density is a challenge for Si-based semiconductors due to the physical characteristics of material. These can be overcome by employing wide-band-gap materials like SiC. This paper compares a second generator SiC MOSFETs against a normally-on Trench JFETs and theirs performances in a high efficiency battery converter for residential photovoltaic systems...
An algorithm for Continuous Set Nonlinear Model Predictive Control (CS-NMPC) is investigated. The proposed strategy is employed to realize flux and torque control for an Induction Motor (IM). It is implemented on an FPGA-based system and its effectiveness is demonstrated with experimental results. The iteration based structure of the algorithm, makes it possible to reduce the needed logic resources...
This paper presents the optimal design of a modular multilevel converter (MMC) for use in a standalone high power energy storage system based on split batteries (sBESS). The MMC allows for the sBESS to connect directly to the medium-voltage grid without the need for a line-transformer. A free parameter variation is performed to compare designs with different numbers of modules and different power...
The article deals with the design and implementation of a reduced scale laboratory platform consisting of a number of programmable emulators. By connecting these devices into the same grid, different micro-grid configurations can be emulated, allowing to perform many experiments related to its management, control and protection. Here, the proposed platform layout is described and its performance is...
Demand for high power density and miniaturization are pushing the application limits of Switched Capacitor Converters (SCCs) to new areas. Their benefit has up to now been used only in low power application ICs such as memories, or mobile phone backlighting where efficiency is not critical and magnetic components are not available. Recently, research in SCCs is demonstrating that their benefits can...
This paper proposes and investigates the second life application of computer power supplies for PV applications. The emphasis is on reclamation and reuse of operational power supply components and circuits. Results shown verify operational limits of the power supply validating its suitability for PV-MPPT systems.
The shortage of energy resources as well as the increasing price of electrical power leads to new studies in the field of efficiency improvement for all kinds of electric devices. Lighting systems are not exception. Smart lighting systems are capable to reduce electrical power consumption significantly by the regulation of the illumination level in accordance with proper light regulation strategy...
Power electronic devices are important in almost all industrial sectors. Power converters are used for electric drive systems in the production of an automation industry, in the automotive industry, as power supplies in telecommunications or for power conversion in power supply systems. For testing such electronic equipment, hardware-in-the-loop simulation is almost a standard method today, especially...
This paper introduces a survey about model elicitation of interior permanent magnet synchronous motors (IPMSMs). In many cases, the magnetic flux of these motors contains significant higher harmonics due to their real design. From this reason, the classic model in d, q reference frame (Clark-Park transformation, space vectors) doesn't describe exactly the motor behavior. For motor without damper winding,...
A Fast Field Cycling (FFC) Nuclear Magnetic Resonance (NMR) relaxometer combines optimized magnets (low volume and power losses) and power apparatus that integrate power supplies and control methods. The magnet of a FFC NMR relaxometer determines the requirements of the main power supply. As main requirement, the magnet current should be controlled linearly in order to control the magnet flux density...
The reliability of discrete power semiconductor packages is getting more and more important in regard to the increasing number of power applications in the low power range. Therefore it is necessary to get more information and details on reliability of discrete packages and systems by performing reliability tests as well as simulations. In this paper the chosen approach and first results of simulations...
This paper presents a nonisolated multilevel step-up dc-dc converter suitable for high power and high output voltage application. The main features of proposed converter are: reduced voltage across the semiconductors; low switching losses; and reduced volume of input inductor. This paper focuses on the five-level structure of the proposed converter, in which the theoretical analysis is carried out...
Ferrite-based micro-inductors integrated on silicon are proposed as potential hybrid integration in low-power medium frequency DC-DC power converters. The inductors are fabricated at wafer level using micromachining and flip chip assembling techniques. The proposed process is based on a sintered ferrite core placed in between thick electroplated copper windings on two silicon substrates. The low profile...
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