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This paper presents a new type of cascaded PWM ac-ac converter with phase-shift PWM control. It can reach high output voltage by cascading single-phase units of low voltage rating devices. The proposed converter does not sense current/voltage polarity, and does not require current/voltage sensors and lossy snubbers for commutation, thereby the control complexity can be decreased. It has no shoot-through...
Managed Pressure Drilling (MPD) is a control technique for controlling pressure in the presence of wave disturbance. It works as an insurance against delays due to weather conditions by saving time and increasing the efficiency of offshore drilling operations. During MPD, a circulating drilling fluid is released in well through control choke which helps to dynamically control fluid pressure in the...
The use of low voltage DC microgrids is a promising concept that makes improvements in power quality and reliability to end users through different control techniques. A coordinated control strategy is addressed within DC microgrid for proper power management between sources and loads and regulation of DC bus voltage. For this; different modes of operation are performed based on state of charge of...
A comparative analysis of Boost and Buck-Boost Converter for power factor correction (PFC) with diode bridge rectifier is discussed in this paper. Boost and Buck-Boost PFC converter faces very high THD and poor PF in open loop control. Thus Hysteresis Band Current controller is used to reduce the Total harmonic distortion (THD) of input current waveform and improve power factor. PFC is attained here...
In recent years, the three-phase pulse width modulation controlled voltage source converter (PWM-VSC) has found its way to wide range of applications, among which renewable energy sources and adjustable speed drives are the most common. In order to achieve low harmonic distortion of current at the point of common coupling (PCC), LCL filters are used for grid connection since they ensure higher damping...
In this paper, a new dual output DC-DC converter is proposed. This topology is achieved from another dual output dc-dc converter with a little change. Conventional dual output converters provide two same level voltages in the outputs; but this topology provide two different voltage levels. In this topology, one of the output voltage gain has a considerable increment. This topology, uses two switches...
A more accurate steady state analysis of the zero-voltage switching quasi-resonant (ZVSQR) converter is conducted in this paper. The conversion ratio equation and the conditions to achieve zero-voltage switching (ZVS) are derived. According to the analysis, a ZVSQR converter can be designed to operate within a wider input voltage range. A ZVSQR inverted buck converter is simulated as an example to...
This paper proposes a novel method for ripple cancellation in multi-phase converters. Unlike the conventional multi-phase converter, the proposed topology can cancel the ripple irrespective of the duty ratios. The proposed topology is designed to give 3.3V output for wide supply range of 4.5 to 18V and load range of 0 to 3A in AMS 0.35um high-voltage CMOS process. Transistor level simulation results...
There is a growing interest in intelligent maintenance in which supervision and its main component — the diagnosis — occupy a fundamental place leaning more towards dynamic monitoring applications and therefore to prognosis. In this sense, the use of artificial intelligence techniques has been under much research. The ability to monitor without modeling the system in an environment or if its subject...
To harness the power from solar has become a common phenomenon. Though the improvement in the efficiency of solar cell is gained up to 68% eventually against the claim of 85% by the manufacturers. To raise the overall efficiency of the solar system with the advent of power electronics engineering is also continuously performing an important and novel role. This paper proposes switched inductor buck...
There is a need to improve the power quality of the grid as well as the power factor implied on the grid due to the nonlinear loads connected to it. A new single phase bridgeless AC/DC power factor correction (PFC) topology to improve the power factor as well as the total harmonic distortion (THD) of the utility grid is proposed in this research. By eliminating the input bridge in conventional PFC...
Non-linear single-cycle load transient improvement structures are proposed for current-mode controlled converters. Two popular variable-frequency current-mode controls are Constant On-Time (COT) and Ramp Pulse Modulation (RPM) due to their fast transient response. However, conventional COT and RPM both need multiple steps to increase the inductor current during load step-up transient. The fastest...
Conventional three-phase MMC consists of six-arms, each arm is controlled to generate unipolar voltage ranging from zero to Vdc where Vdc is the input DC voltage. Each arm voltage has two components (DC and AC components). In this work, the operation of MMC with reduced number of arms (four arms only), correspondingly reduced cost is presented. This mode can be also used with the conventional three-phase...
In this paper, a disturbance observer (DOB) algorithm is proposed to solve the output voltage regulation of an Interleaved Boost Converter (IBC) in presence of unknown disturbance and parameter uncertainty. IBCs are improved model of boost converters which provide better operation than conventional converters. Also, these converters are rather complicated, therefore, the modeling of them are more...
Low temperature cofired ceramic (LTCC) is an effective method to realize the miniaturization, high reliability and low cost for microwave and high-frequency devices. In the paper, a miniaturized 3 dB LTCC coupler using lumped elements is proposed based on the even-odd decomposition method for the built of image-reject mixer (IRM) in receiver systems. With a novel and compact structure, the coupler...
This paper presents the modeling and simulation of a 100 kWp Photovoltaic Power System installed and operating at G. Narayanamma Institute of Technology & Science since March 2014. The utility grid-connected 100 kWp PV system comprises of PV arrays installed on the rooftop terraces of two buildings in the college connected through five 20 kW inverters to the LT distribution panels in the two buildings...
This paper presents a new single inductor Dual Input-Dual Output dc-dc converter for a standalone hybrid energy system. The converter has two unidirectional ports, one bidirectional port for storage element and one output port. The converter operates in dual input-dual output mode, dual input-single output mode and single input-single output mode. Both the input sources can power up the load individually...
To cope with power from large-scale renewable systems, more and more power electronic converters are used in parallel. Typically, carrier interleaving is used, thus leading to a decrease in filtering requirements. However, this causes additional circulating current to flow between the modules of the converter. The modules of the parallel converters are Voltage Source Converters (VSC). Usually, a coupled...
This paper presents a design methodology for a first order L filter inductance used to connect a three-phase power converter to the grid. This method uses the desired THDi to calculate the L filter inductance to ensure the grid-connection standards are met. This methodology was designed for converters operating with Space Vector PWM modulation.
Single-stage DC-AC power converters are gaining higher popularity due to their merits compared to the conventional two-stage DC-AC conversion systems. One of these converters is the buck-boost voltage source inverter. This converter has some merits over the other single stage DC-AC power converters in terms of passive component-count, overall gain ratio, and voltage stresses. This paper studies the...
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