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In the paper the design of an IPMSG for small wind turbines is presented. Based on classical construction of induction motor (IM), the internal permanent magnet generator (IPMG) was projected. Parameterization and sweep analysis of the rotor geometry was done in the finite element analysis (FEA) software, to obtain the maximum back electromotive force (BEMF). Based on this analysis, one case was chosen...
This paper presents the design and optimization of an isolated DC-DC converter that could be potentially selected for advanced multilevel topologies for offshore wind turbine applications. The superior properties of Silicon Carbide material in terms of switching speed, voltage withstand and efficiency provides the possibility to develop a highly optimized DC-DC converter.
PV systems are influenced by disproportionate impacts on energy production due to mismatch cases frequently. The occurrence of multiple maximum power points (MPPs) adds complexity to the tracking process in different PV systems. However, current Maximum Power Point Tracking (MPPT) techniques exhibit limited performance. This paper introduces an Enhanced simulated annealing (ESA) based GMPPT technique...
This paper proposes a DC-bus signaling (DBS) method for a power management in a DC microgrid. In order to autonomously increase its reliability and response speed. As opposed to a centralized power management system, which needs communication among the power sources and load, the proposed DBS method uses the common DC-bus voltage to determine proper operation and does not require communication. The...
Model Predictive Control (MPC) method offers advantages of easy implementation and fast dynamics. However Model predictive control method has variable switching frequency, which makes design of the output filter difficult for power converter. Despite the problems of MPC algorithm, there are little methods to fix the switching frequency using MPC algorithm in power converter. Therefore, this paper...
This paper is about the design for the control of a cascaded hybrid converter for railway applications. It shows, how to control the converter with considerations of special aspects for the use in rail vehicles. It considers several aspects of reducing THD of the current and reduction of switching losses.
In this paper, a simple voltage balance controller for a SST using cascaded H-bridge rectifiers is proposed to deal with voltage unbalance problem of DC-links. The tolerance of parameters on DC-DC stage, which consists of parallel-connected DAB converters, can cause the unbalance problem of output voltage on H-bridge rectifiers. In order to solve this unbalance problem, an additional voltage balance...
Gallium nitride (GaN) switches have superior switching performance when compared to the traditional Si technology. Therefore, GaN switches are an appealing option for power converters and electrical drives. In this paper, considerations for a high-speed electrical drive with inverter switching frequency of 1 MHz are presented, along with simulation results of the motor control of the drive.
Input-series-output-series (ISOS) inverter system is very suitable for high input voltage and high output voltage power conversion applications. If the inverter system topology is applied to the grid-connected application, a large-capacity inverter system can be built with multiple small-capacity standardized inverter modules, which will improve system reliability and simplify system design. For the...
A control system for a DC-DC boost converter based on a deadbeat controller providing a finite duration transient in a small neighborhood of the equilibrium state is proposed. Deadbeat control is implemented by reducing a system matrix to the Frobenius form without transformation of state variables. A procedure to obtain deadbeat controller parameters for DC-DC boost converter is stated. Mathematical...
This paper is devoted to load-carrying capacity of an induction machine under voltage containing subharmonic injection. The permissible machine load is investigated for various frequencies of voltage subharmonics. The results of calculations are presented for a totally-enclosed induction cage machine of rated power 5.5 kW.
This paper presents a new and low-cost thermal interface assembly between a printed circuit board and a heat-sink that provides electric isolation on the whole surface, and thermal conduction where needed. The assembly relies on the association of an isolation and a spacer layer and a thermo-conductive gel. The bill of material is 8 times lower than a best in class thermal pad, and equivalent thermal...
The press-pack IGBT (PPI) modules are characterized by design of double-sided cooling, solderless joint and wire-bondless contact. These features allows them to be utilized in the field where power density and reliability are demanding, especially in multi-MW wind turbine applications. However, owing to the press-pack structure, there is parasitic inductance which can't be neglected in the mechanical...
This paper investigates the fundamental characteristics of contactless power transfer in seawater. The influence of seawater on contactless power transfer via magnetic resonant coupling method is experimentally examined. The experimental results show that the transmission efficiency decreases about 5% in seawater compared to that of in air.
This paper describes selected issues concerning realization of energy storage system (ESS) designed to operate in power distribution system. This paper presents a modular approach of 300 kVA power converter operating with superconducting magnetic energy storage (SMES), which gives high dynamics together with high power and suitable capability for instantaneous energy storage. Analysis and simulation...
A v-shaped interior permanent magnet (1PM) and a surface mounted permanent magnet (SMPM) machines with the same dimensions and magnet volume are used as WEC generators and are evaluated using the Life Cycle Cost (LCC) method. The most optimal design from the economical perspective is determined to be the SMPM.
The paper presents a technique of parameter stabilization of a wireless, resonance based energy transfer system for maximizing its power. The technique combines tuning of resonant frequency by means of variable capacitance and adjustment of magnetic coupling to maximize power. The paper presents experimental test results on a laboratory prototype of the system.
A multiple drives solar-pumping system is presented in this paper. The system is based on a singlestage photovoltaic (PV) topology where an array of solar panels is connected to multiple inverters supplying equal centrifugal pumps. The inverters are operated to obtain maximum power from the PV system and a standard indirect vector control strategy is used to regulate the machines currents. Moreover...
This paper describes sensitivity analysis to q-axis inductance variation of the position estimation using Extended Electromitive Force (EEMF) excited by High Frequency (HF) signal injection based on the mathematical formula evaluation, and it shows that the influence on the q-axis inductance variation is very small. Finally, experimental results indicate that position estimation can be performed well...
Recent research has shown great potential in energy efficiency optimization by harvesting regenerative energy of industrial robots. This paper presents further insight into how dependent regenerative energy is on the mass of the robot tool, as well as how the total regenerative energy is distributed between various robot links.
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