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This paper presents the analytical design procedure to select the inductance and the capacitance values of both the input and output filters for the 5-Level three-phase Back to Back E-Type Converter (5L3Φ BTB E-Type Converter). The 5L3Φ BTB E-Type Converter is used to accomplish the double conversion AC-DC/DC-AC in applications which include variable speed industrial electric drives and the interfacing...
With the development of more/all electric aircrafts, variable frequency AC (VFAC) generation systems become popular. Dual stator-winding induction generators (DWIG) utilized in VFAC systems have the feature of the high fundamental frequency. However, the switching frequency of high power devices does not exceed 5 kHz in general, which makes carrier ratio lower. Thus, how to ensure the quality of the...
This paper presents a method of active filter applied to auxiliary four- quadrant converter of electric locomotive or high speed train. In this technique, auxiliary power supply system is designed to generate an inverse harmonic current at AC side to produce the high frequency compensating current. So the auxiliary four- quadrant converter should operate at a high speed with the application of SiC...
Paper is produced to grant a concept regarding the use of shunt hybrid active power filter to counteract the deteriorating effect of harmonics in electrical power utility system. 3-phase uncontrolled bridge rectifier has been used as a source of current harmonics of order 6n±1 where n is an integer, producing Harmonically Balanced Condition by drawing equal magnitude of (6n±1)th current harmonic in...
This paper presents a low harmonic 12 pulse rectifier. Then in order to investigate the influence of leakage inductance on 12 pulse rectifier. A set of improved switching function method is proposed. To obtain the mechanism that input current harmonics can be suppressed by circulating current of DC side, this paper analyzes the relationship between input current, output current and circulating current...
Solid state transformer topologies (SST) have gained great attention because of having features such as reactive power compensation, output voltage regulation and smart grid operation etc. Among SST topologies, three-stage topologies have been mainly focused because there are many appropriate topologies for each conversion stages. However, conventional three-stage topologies may bring complex closed...
The multipulse converters are widely applied in the AC-DC conversion, once these structures take advantage of the phase-displacement provided by the transformer or autotransformer to mitigate part of the harmonic content injected in the grid. This work proposes a novel structure using a half-controlled multipulse boost-based converter, operating in Discontinuous Conduction Mode (DCM) aiming reducing...
The discontinuous current mode (DCM) boost power factor correction (PFC) converter features zero-current turn-on for the switch, no reverse recovery in diode and constant frequency operation. However, due to DCM, the energy transfer does not cover the whole switching cycle, the peak and RMS values of the inductor current are large, which also occurs to the switch and diode. This increases not only...
For grid-connected inverter, an LCL-type filter is widely used to suppress switching harmonics, and the capacitor current feedback is used to suppress the LCL resonance. In the published literatures, the relation among LCL parameters, capacitor current feedback and resonance damping was discussed; however, their relation with the low-order current distortion was not seriously considered. Considering...
This paper proposed a closed-loop pulse energy modulation (PEM) control method for a grid-connected three-switch buck-boost inverter. The three-switch buck-boost inverter was studied for both discontinuous conduction mode (DCM) and continuous conduction mode (CCM). Simulations verified the closed-loop PEM control method provided high-quality current injected to the grid and insensitivity to component...
Design criteria are addressed to select the parameters of an asymmetric multilevel shunt active power filter based on a Cascaded H-Bridge topology. The proposed approach is meant to simultaneously compensate both fundamental reactive power and current harmonics. The presented methodology allows to systematically design the main parameters of the power converter, particularly the inductive filter,...
Multiphase generators starts to compete three-phase counterparts. An obvious application for multiphase generators is electrical power generation from wind turbines. Moreover, they can find a slot in conventional generation stations market due to its advantages. The output power from these generators should be processed using power converters but power quality of the line side converter is a requirement...
The harmonic filter for a 3-level neutral point clamped (NPC) grid interface converter is designed in this paper with good filtering performance and small component size. LCL topology is selected because of the attenuation and size tradeoff. The design for inverter side inductor L1 is emphasized due to its cost. A detailed inductor current ripple analysis is given based on the space vector modulation...
As distributed generations (DGs) are mostly connected to the distribution system via converters, and this causes interaction with the grid, harmonic distribution gets impacted. An output-impendence model for grid-connected inverter of DG is introduced, and output-impedance model based backward/forward sweep harmonic power-flow algorithm for distribution system with DGs is proposed. The algorithm can...
In order to make the LED driver to meet the requirements of high efficiency, reliability and low cost, this paper presents a single-stage flyback converter. The operation principles of this converter and the parameters of the major components are fully analyzed. The simulation was conducted under different input conditions by the Saber software. The results show that high power factor and high conversion...
This paper briefly discusses the basic principle of the APFC(Active Power Factor Correction) Transition Mode, then it analyses the working principle of L6563 chip, and use L6563 chip made a 100 W with active APFC Switching Power Supply prototype. Through testing, the results show that the PF(Power Factor) can above 0.98, THD(Total Harmonic Distortion) is less than 8%.
This paper introduced the design of 100W active power correction factor circuit. It gives main calculating parameter of circuit structure, In a wide range of input voltage, improving the power factor and reducing the pollution of electronic grid.
The DC/AC inverters are the key elements of grid-connected PV energy production systems. In this paper, a new technique for the optimal design of the power section and output filter of a full-bridge, grid-connected PV inverter, is proposed. The objective function which is minimized during the Genetic Algorithm-based optimization procedure is the PV inverter Levelized Cost Of the Electricity generated...
In many areas, the use of electronic devices simultaneously results in overloads, voltage fluctuations, and decreases in voltage quality. To protect the sensitive electronic equipments from these voltage fluctuations and enable to gain maximum efficiency from these devices, different types of electronic and electromechanical voltage regulators are used in industry. This paper presents a new type single-phase...
Dual Buck inverter (DBI) is a new topology with characteristics of high frequency and high efficiency. Just like half bridge inverter, the output voltage is a bipolar PWM waveform and voltage stress is high. To overcome these problems, a novel three-level dual Buck inverter, which has uni-polar PWM waveforms output and low voltage stress, is proposed. And the half load-cycle mode of DBI remains in...
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