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This paper introduces a new insertion index selection method to control a Back-to-Back Modular Multilevel Converter (MMC) laboratory platform. The test bench is based on a Power-Hardware-In-the-Loop (PHIL) setup constructed from two 6kVA, 3-phase, 10 cells per arm MMC systems connected in Back-to-Back configuration. The proposed insertion index selection method uses the arithmetic mean of available...
GaN power semiconductor devices show promising properties to achieve high power densities in power converters for voltages in the range of 400 V. The utilization of high switching frequencies and high switching speeds are particularly challenging for filter design and the circuit layout. Within this paper, a comprehensive analysis of design considerations for a GaN based synchronous buck converter...
Modular Multi-level Converters (MMCs) are considered as one of the promising multilevel converter topologies specially in high voltage applications such as HVDC transmission systems. The idea behmd MMC is to use floating capacitors as a voltage sources along with a switchmg circuit (chopper cell) to form what is called “submodules”. These submodules are inserted or bypassed according to the required...
This paper analyzes a cost-effective modification of the rectifier plus boost converter power topology which is commonly found in small wind turbine systems. The paper proposes removing the input capacitor after the rectifier and the boost converter inductance. This will be done without adding any LC filter between the permanent magnet generator and the passive rectifier. This paper discusses both...
The control of modular multilevel converter (MMC) is quite challenging and demands a flexible approach to achieve multiple control objectives. The model predictive control (MPC) is highly effective and suitable to control the MMC. The control objectives are included in a single cost function and evaluated for all possible switching states. The switching state which minimizes cost function is selected...
This paper presents design and implementation of a Integrated boost-flyback converter (IBFC). Operation of the IBFC is described and its key voltage and current equations are given. The practical design of a 96W, 12V-to-48V, IBFC is demonstrated. Experiment on the prototype IBFC shows that it operates with good output voltage regulation and achieves the highest efficiency of 87%.
In microgrid systems one or more inverters should be grid-forming in order to control the voltage during island mode operation. Usually the voltage regulation is operated controlling the capacitor voltage of the LCL filter interconnected between the converter and the load. In the present paper a cascade control is proposed for a Three-Level Neutral Point Clamped (3L-NPC) inverter where the voltage...
Series-series (SS) compensation is widely used in contactless power transfer (CPT) for electric vehicle because of their constant current and constant voltage charging features. In this paper, a mathematical model of SS compensation for CPT system is presented. This model includes the effects of harmonics on parameters of SS compensated CPT system. Fourier series analysis is used for mathematical...
To interrupt a current in a DC system where the feeding voltage is higher than a few kilovolt is a challenge. One popular solution today is the hybrid DC-breaker where a semiconductor is bypassed by a mechanical switch in normal operation to decrease the on-state losses. This paper presents an experimental study of the commutation from the mechanical switch to a parallel diode and IGBT. Three sets...
Applications using dielectric electro-active polymers (DE-EAP) tend to grow quickly due to their most interesting feature: when activated, displacements can reach ranges as high as 200–300%. How interesting this may be, the voltage to be applied is very high — 5 kV — and therefore difficult to handle and manage. Inductive contactless power transfer (ICPT) systems are elegant solutions to completely...
Minimizing equivalent series inductance (ESL) seen by inverter switches is critical to limit voltage overshoot at turn-off. The DC link capacitor and bus structure are traditionally viewed as dominant contributions to the ESL. Results are presented to demonstrate that the IGBT module connections actually have a significant effect on ESL.
One of the largest reliability issues in switching mode power supplies is capacitor aging based degradation. This paper proposes a step excitation based online capacitor wear-out detection method for output stage capacitor of a step down DC-DC converter. Changes in the converter output voltage dynamics are detected during operation by analyzing output voltage step response. Sensitivity of the presented...
Common variable speed drives usually do not feature regenerative braking. The energy produced during deceleration is dissipated through braking resistors. In this paper, a bidirectional converter designed for use with variable speed drives, adding the capability of regenerative braking, is presented. Hardware design and control algorithms are analyzed and comparison with similar proposals is made...
Tesla coil is high-voltage high-frequency testing source used in laboratories and testing departments of MV and HV. This paper deals with the design, implementation and measured output operational parameters of the Tesla coil, which is located in the High voltage laboratory in Brno University of Technology.
This paper presents a novel dual-input power converter (DIPC) for PV-wind hybrid power system. The proposed DIPC can simultaneously process two different kinds of renewable sources. Even if either of them shutdowns from the power system, the proposed DIPC can still keep providing sufficient power for output. Moreover, the energy stored in leakage inductance can be completely recycled for promoting...
This paper describes a design of a power transfer inductive link for charging batteries of wireless sensor network nodes. The application physical constraints imposes a maximum size for the coils and demands a design methodology to maximize output power delivered to the load and energy transmission efficiency. This paper presents a complete methodology for designing the coils of wireless power transfer...
A solid-state modulator rated for 50 kV, 120A, 4μs and 250 Hz has been designed. The discharging circuit of the modulator is being tested at ∼ 33 kV, 40–80A, at a maximum pulse repetition rate of 30 pps. The paper discusses development and testing of prototype discharging circuit on resistive load and magnetron. The technique used for measurement of pulse transformer leakage inductance, distributed...
This paper introduces a SEPIC derived converter suited for alternative energy generation applications. The proposed converter utilizes tapped inductor and charge pump techniques to achieve high step up gain and a lossless regenerative snubber to attain high efficiency. The paper presents principle of operation, theoretical analysis, and experimental results.
Linear Transformer Driver (LTD) technology is being developed for short pulse electron beam applications as well as high current Z-pinch drivers. Designs for both applications require low inductance spark gap switches which hold off 200 kV and trigger with low jitter. LTD cells or cavities typically contain many parallel switches which must close with low jitter to insure efficient operation of the...
This paper explains the non-shoot-through operation of DC/DC converters with a quasi Z source inverter. Proposed DC/DC converters use the quasi Z source network to provide voltage buck and boost operation in one conversion stage. Used topology causes uncontrollable DC-link voltage rise during zero states when the converter is operating in the voltage buck mode. To explain the processes a steady state...
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