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This paper presents an analytical model to provide a rapid estimation of the steady-state averaged power loss of a T-type STATCOM with Virtual Zero level Modulation (VZM) to balance the neutral point voltage. A case study is then conducted on a 54kVA rated T-type STATCOM system to investigate the power loss distribution over power devices and variations over switching frequency. A comparison is made...
In this paper, we propose a method for identifying the differential mode impedance of a paralleled converter cell. The equivalent Thevenin / Norton circuit method is used for prediction. The predict of ElectroMagnetic Interference (generated by converters connected to the electrical network to identify the sources of noise, impedance and harmonics according to the identification of the contribution...
The increasing complexity of power grids makes hardware-in-the-loop simulations of electrical power systems more and more interesting for the industry. The simulation models are typically large. They often have to be split and used on several hardware platforms to allow efficient computations. Finding an appropriate position for splitting the simulation model requires expert knowledge about the electrical...
In this paper, Finite Control Set Model Predictive Control (FCS-MPC) is used to select the optimal switching sequence when synthesizing a reference space vector for a Three-Level Neutral Point Clamped inverter. The cost function is designed to ensure the selection of a switching sequence which balances the neutral point and keeps switching losses low. Simulations and experimental results prove the...
The simulation of transmission and distribution grids comes with a trade-off between the number of modeled components and the modeling depth on the one hand and the simulation speed on the other hand. An example system of a grid converter of a 2 MW full scale converter system is used to show a step-by-step model order reduction. Starting from a detailed switched model the order reduction is shown...
This paper describes a methodology to build a combined conducted and radiated emission model for integrated circuits. The development of emission models of a FPGA extracted from two different approaches is presented and discussed. The first approach allows to build a predictable model from FPGA implementation and some passive measurement on FPGA device. The second approach allows to build a model...
The power electronic based Grid Side Converter (GSC) is the key technology for interconnecting RES. In order to obtain accurate simulation results, it is important to have a detailed-realistic modelling of GSCs. This requires a very small solver step (i.e., solver period near 1 μs) due to the high-frequency switching operation of these converters. Such a small solver period imposes computational constraints,...
The operation of the off-grid system consisting of projectable PV panel array and two dieseis (one in reserve) generators SDMO J200K with 160 kW installed capacity are considered in this article. The aim of the study is to make a stability analysis of the system with an evaluation of problems can occur and their possible solutions, which keep the system operational. Three possible faults at generator,...
This paper presents the capacitor size reduction of a MMC-based transformer-less STATCOM for medium voltage ac distribution system. The instantaneous power swinging flows into the single-phase configuration results in a high capacitance needed; however, by accepting the swinging voltage in the capacitor, the capacitance can be drastically reduced. This paper analyzes the dimensional size reduction...
The loss contribution of a 2.3 kW synchronous GaN-HEMT boost converter for an input voltage of 250 V and an output voltage of 500 V was analyzed. A simulation model which consists of two parts is introduced. First, a physics-based model is used to determine the switching losses. Then, a system simulation is applied to calculate the losses of the specific elements. This approach allows a fast and accurate...
This paper analyzes a three-phase Dual Active Bridge (DAB) dc-dc converter with three-level phase-legs, showing a significant increase in the soft-switching region compared to two-level operation. A strategy is presented that results in a Zero Voltage Switching (ZVS) modulation scheme that relies on analytical equations, uses a small amount of switching modes, and obtains close-to-minimal rms currents.
A full-bridge power-electronic building block using an inverse coupled inductor (CI) is presented which could substitute standard hard switched inverter legs. In contrast to commercial CPU supplies using CIs, the system is operated at full duty cycle range 0…1 at elevated power levels and shows experimentally proven material savings. The mathematical modeling leads to a volume comparison between single...
Inversion-based control for modular high frequency (MHF) inverters in a two-degree-of-freedom structure is presented in this paper. This establishes a state-space average model of MHF inverters. The results of this paper are illustrated using simulation and experiment based on an MHF3P inverter with four submodules.
Oscillations in power electronic circuits with fast switching semiconductors are commonly known and the corresponding parasitic elements have been investigated in multiple literature. However, this paper investigates the triggering of these electromagnetic interference (EMI)-critical oscillations. An analytical description is derived using a boost converter circuit. Based on this description an optimization...
This paper deals with implementation of Perturb and Observe algorithm on a Photovoltaic System using different converters in MATLAB/SIMULINK. The model of Photovoltaic System is based on mathematical equations. The Perturb and observe algorithm is the Maximum Point Tracking Technique (MPPT) which applied on the developed Photovoltaic system in order to operate it at its maximum power point. The Perturb...
An Artificial Neural Network has been proposed as predicting the performance of the Software Defined Network according to effective traffic parameters. Those used in this study are round-trip time, throughput and the flow table rules for each switch, POX controller and OpenFlow switches, which characterize the behaviour of the Software Defined Network, have been modelled and simulated via Mininet...
Direct braking system is a key part of train security. This system is complex and nonlinear because of coupling multi-physic energies (pneumatic, electric, mechanical translation and rotation) and working in hybrid structure involving continuous and discrete modes because of presence of relays and diodes. The objective of the present paper is to use one representation: a hybrid bond graph as a multidisciplinary...
Nowadays, solar power becomes one of the most suitable renewable energy source for power generation. In practice, inrush current is produced in grid connected transformer(s) during routine switching process of solar power plant. This inrush current effects to winding of transformer as well as produces harmonics and power quality issues. In this paper the calculation of inrush current and its effect...
The effect of non-idealities of a high frequency class D amplifier on it's output voltage is analysed. Firstly individual non-idealities like dead time, MOSFET body-diode drop, MOSFET ON-State drop, finite turn-on and turn-off time, series resistance of inductor and capacitor of output stage filter are taken one at a time and their effect on output voltage is analysed. Then effect of all of these...
The paper presents on the improved soft switching buck converter in terms of the zero voltage switching (ZVS) and zero current switching (ZCS) which reduces mainly switching power losses of the main semiconductor compared with the hard switching skill over a wide range of the load variations. The soft switching with zero current turns on so the lagging leg of the main switch is achieved ZVS during...
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