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The Buck converter exhibits interesting nonlinear phenomena which many studies have addressed, and the resonant parametric perturbation is effective to control these nonlinear phenomena. We investigate the control mechanism by using the monodromy matrix derived from the Filippov's method when the perturbation has an appropriate phase shift and the duty ratio is not changed. We find that only one term...
The second-order sliding-mode controller based on improved sub-optimal algorithm for synchronous Buck converte r is designed, and the converter can be controlled only by detecti ng the output voltage without measuring the capacitance current of the converter. By introducing hysteresis to sub-optimal algorit hm, the switching frequency of the converter is limited when the output voltage is stable....
This paper presents the design, analysis, and experimental validation of a fault detection and identification (FDI) scheme for dc-dc power electronic converters. The FDI scheme includes two new classes of fault filters: (1) a linear-switched fault detection (FD) filter and (2) a bank of linear-switched fault identification (FI) filters. Both the FD filter and the bank of FI filters have a structure...
Boost converters are widely used in several applications such as solar PV systems, energy storage systems, etc. In order to improve its dynamic performance, several model predictive control (MPC) strategies have been proposed to govern this DC-DC converter. However, in general, they require long prediction horizons to achieve a stable closed-loop due to its well-known non-minimum phase behavior. A...
VSC based converters are among the most preferred interfaces to perform the interconnection, especially for integration of distributed energy sources, active filtering, and power supply applications. Hysteresis current control presents very attractive characteristics for these applications such as: robust control, fast dynamical response, built-in over-current protection and simple and reliable implementation...
The purpose of the paper is to investigate the application of a Switched Reluctance Generator (SRG) for future wave energy converters. This machine presents some favourable features as compared to others. The machine optimal operation can be obtained after a detailed assessment of the control strategy. For this purpose, a SRG model is implemented in Matlab® Simulink® environment to find out the values...
The Modular Multilevel Converter (MMC) topology has become one of the most promising solution in HVDC applications when compared with similar approaches. The evaluation of the power losses in an MMC terminal is fundamental to estimate the overall converter efficiency and size the required thermal management system. In this paper, a complete comparison of two methods to calculate conduction and switching...
Smart grid is a developing field for energy researchers. It offers technological improvements to have more controllable, reliable and sustainable power grids. Especially, the decreasing trend of fuels has pressurized to pay researchers’ attention to renewable energy sources such as solar systems and wind turbines. The renewable energy sources generate electric power in different characteristics. Therefore,...
Conventionally, only one out of the two capacitors in a three-level submodule is involved in the arm current path to generate the first non-zero voltage level (E) in modular multilevel converters (MMCs). While two capacitors are connected in series to obtain the second non-zero voltage level (2E). In this paper and in order to generate the first non-zero voltage level (E); parallel-connection of the...
We present a control approach for the modular multilevel converter (MMC) with series and parallel module connectivity (MMSPC) that provides natural module balancing, reduced conduction losses, and enhanced robustness afforded by the parallel mode. In conventional MMC control, the voltage of each module's storage element has to be measured or estimated to enable the controller to equalize the voltages...
Recently, a hybrid modular multilevel converter with cascaded full bridges (HMMC-CFB) is proposed. This converter has mainly two parts: a director part (DP) and a wave shaping part (WSP). The DP consists of a conventional modular multilevel converter (MMC) with half bridge submodules (HBS). The WSP is a series connection of full bridge submodules (FBS) and attenuates the voltage harmonics produced...
This paper presents a digital Active Gate Drive (AGD) methodology for power semiconductor devices. The inherent latency limitation of digital signal processing systems is addressed by a sequential optimization procedure that uses voltage and current signals recorded at the previous switching edge to develop an optimized gate drive waveform for the next switching edge. Experimental results using a...
The aim of this paper is to analyze wind energy conversion system (WECS) using permanent magnet synchronous generator (PMSG). The configuration consists of a Permanent magnet synchronous generator incorporated with certain power electronic circuits feeding to a three phase load. Wind power control is done with the help of Buck boost converter connected across the dc link so as to keep constant voltage...
This paper introduces a practical power supply design method for the display panel of smartphone. The specific goal of this design method is to reduce the voltage stress over the internal MOSFET of the power supply for more reliable operation. A power integrity analysis is conducted to evaluate a factor which increases the voltage stress over the internal MOSFET. Based on this analysis, two PCB layouts...
The modular multilevel converter (MMC) is a highly efficient multilevel converter topology suitable for high and medium voltage applications. However, one of the negative traits of MMC is the existence of circulating current. The detrimental effects of circulating currents include distortion in arm voltages, converter power loss and high switching stresses on semiconductor devices. This paper aims...
Power consumption and device size have been placed at the primary concerns for battery-operated portable applications. Switching converters also known as DC/DC convertors gain popularity in powering portable devices due to their high efficiency, compact sizes and high current delivery capability. Currently, the Synchronous Buck convertor has become much more popular in portable devices due to their...
Current source modular multilevel converter (CSMMC) is a potential topology for the high-power applications with low-voltage and high-current requirements. One of the most challenging issues associated with the CSMMC is the submodule inductor currents imbalance if it is not properly controlled. This paper presents a control method for submodule inductor currents balancing in a CSMMC. The control method...
In this paper, a new approach to the discontinuous modulation technique for the operation of the modular multilevel converter (MMC) is presented. Discontinuous modulation is based on adding a zero-sequence to the original modulation signals so that each MMC arm is clamped to the upper or lower terminals of the dc-link bus during some intervals. In combination with a circulating current control, the...
The Modular Multilevel Converter (MMC) is a relatively new converter topology which has been favoured for high voltage DC transmission due to its performance, flexibility in control and its modular and scalable design which allow it to be used over a wide variety of system voltage levels and power ratings. The converter consists of a number of cascaded half bridge cells with isolated capacitors to...
The modulation technique chosen for use in the power converter largely defines the harmonics generated, consequently it is a fundamental part that must be studied. In this paper it's shown a comparative between different modulations techniques applied to a modular multilevel converter. Sinusoidal Pulse Width Modulation, Space-Vector Modulation and Nearest Level Modulation are studied. The whole techniques...
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