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This paper deals with attractive voltage-source single-ended sub-resonant HF inverter as a simple wireless power transfer (WPT) based on unidirectional IPT in addition to Dual Active HF inverter and HF rectifier as transmitter and receiver of WPT is developed for bidirectional EV2H smart energy management architecture. Firstly, the voltage source single-ended sub-resonant HF inverter using a single...
Multi-level inverters became a competitive technology in the field of medium voltage inverters. Cellular H-Bridge (CHB) is a traditional multilevel topology, which seems to have a lot of attractive features in the MV applications. During the MV product development, rapid prototype methods like co-hardware simulation can be applied to shorten the inverter control verification process. This paper presents...
The article presents the review of power electronics converters applied in induction heating. The IH application area of the medium frequency and medium power was taken into account. The different types of power electronics converters, resonant circuits and numerous control methods are introduced. The issue of inverter output and heating inductor matching is presented, including examples of solutions...
This paper presents a simplified model of Voltage Source Converter based High Voltage DC (VSC-HVDC) transmission system for dynamic simulation study. Aim of the simplified model is to diminish the complexity and simulation time of the analysis of grid integrated offshore Wind Farm (WF) connected through VSC-HVDC transmission line. This is because simulation analysis of offshore WF based on the detailed...
A novel solution to high efficiency and high specific power three-phase Back to Back Power Converters has been proposed and theoretically investigated in this paper. Target applications are variable speed gen-sets, electric drives and independent power supplies. The solution proposed is based on a novel 5-Level E-Type topology. Advantages of the new solution, such as significant reduction of the input/output...
Loads have an important impact on the behavior of an islanded grid, yet they remain the main unknowns of the system. Electronic-based loads — like rectifiers in particular — are rarely studied in the context of unintentional islanding studies, in spite of the fact that the rate of electronic loads has strongly increased in the last decades. In this paper, the impact of electronic loads on islanding...
The maximum efficiency point tracking (MEPT) control strategy has been adopted in state-of-the-art wireless power transfer (WPT) systems to meet power demand with the highest efficiency against coupling and load variations. Most of the MEPT implementations use dc/dc converters to regulate the output voltage and maximize the efficiency at the expense of increased system complexity. Other implementations...
A DC-DC converter for high-power battery chargers with the power-capacity over 6.6-kW for electric vehicle (EV) is proposed in this paper. Due to a new architecture, the proposed converter achieves the reduction of conduction loss at the primary-side by as much as 50% and has many benefits such as reduced circulating current, less duty-cycle loss, and lower secondary-voltage stress. In addition, its...
This paper first discusses control loop characteristics for the PWM rectifier and the inverter used in an on-line UPS system. Then a unified control scheme for both the PWM rectifier and the inverter in the UPS system is investigated using single phase control in ABC frame. Based on the unified control scheme, a generic control kernel is defined. This generic control kernel is used to realize the...
Modular Multi-level Converter (MMC) has been widely researched in order to apply it for the back-to-back (BTB) high voltage direct current (HVDC) system. This paper proposes a new pre-charging scheme for the sub-module capacitors of MMC that is operated in nearest level control (NLC) modulation. The proposed scheme does not require any additional circuit or pulse width modulation (PWM) technique....
The state-of-the-art architectures of high frequency high voltage (HFHV) generators are surveyed and classified according to their applications to achieve compact size, high energy efficiency and high power density. HFHV generation architectures and derivation methodology are concluded systematically based on the level of distributedness of the main sub-components. The characteristics for each HFHV...
Wireless power transfer (WPT), a revolution in energy transmission, commercializes in decade years and whose electromagnetic compatibility (EMC) also becomes an important issue at the same time. We investigated the conducted electromagnetic interference generated by series-series resonant WPT system using resonant magnetic field coupling with two-coil configurations in this paper by building the circuit...
The article presents the results of the transients investigation of a DC-DC converter as a part of the energy storage system in the frequency-controlled electric drive which works in hard start-up and braking modes with a large number of cycles per hour. The ultracapacitor is used as an energy storage element connected with the DC link of the frequency converter through the bidirectional DC-DC converter...
Connection of high power medium voltage drives and motors has increased significantly over the last 25 years, the power level of individual drives in oil & gas applications is in excess of 50MW and multiple drives of high power can be connected to the same grid on either national or island networks. The paper will describe what the owner has to think about with combinations of different types...
Full load back-to-back test of VSDS’s (Variable Speed Drive Systems) are sometimes required for oil and gas projects. VSI (Voltage Source Inverter) technology is becoming the drive system of choice for super large compressor drives, up to 100 MW. Special consideration /facilities are necessary to perform back-to- back tests for VSDS driven by VSI, because the type of converter used for such large...
An isolated grid-connected photovoltaic (PV) power system for household is proposed and the control strategy of the system is presented in this paper. The proposed PV system employs an interleaved boost converter as the first power-processing stage, which can boost a low voltage of PV array up to a high dc-bus voltage. In the traditional isolated PV system, industrial low-frequency transformers are...
Trend of increasing the share of electricity production from the renewable energy sources will surely continue the in the upcoming time period. This paper outlines multiple solutions of accumulation of energy, especially electricity, in the Technology Center of Ostrava (TCO). It presents solutions for storage of electrical energy into the batteries with use of power converters with an additional function...
The paper focuses on the charging of LiFePO batteries with big output voltage. This voltage is necessary to feed a frequency inverter circuit with approx. output of 7.5 kW. This is a part of the solution applied during the Pre-seed project solved in the past at VSB — TUO Ostrava. Due to the unavailability of standard chargers, we provide a solution based on the Siemens 6RA80 controlled rectifier.
Phase-shift control strategy is adopted extensively in wireless charging system (WCS) to regulate inverter output voltage, and namely, adjusting system output power under various load conditions. However, when it comes to light load or even no-load, the lower the output power is, the larger phase angle should be — which could cause inverter output voltage waveform to be abnormal. So, how to satisfy...
Class-E inverters and Class-E rectifiers are combined to compose isolated Class-E2 DC/DC converters to transfer power through loosely coupled inductive coils. A design method for this converter is discussed to achieve ZVS (zero-voltage switching) and ZDS (zero-derivative switching). The converter is operated in a fix-frequency and open-loop mode. Load characteristics for this converter are analyzed...
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