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Microinverters usually connect a PV panel to a Single-phase power grid. In such system, the input power is constant while the output power oscillates twice the line frequency. Thus, the input and output power differences should be stored in a storage component, which is typically an electrolytic capacitor. However, electrolytic capacitors are usually blamed for their short lifetime. Recently, some...
Recently, three-phase six-switch dual-terminal inverter (SSDTI) has been proposed as a reduced switch count converter which employs less number of semiconductor devices compared with former dual-terminal inverters proposed so far in the literature. In SSDTI, the sum of upper and lower modulation indices must be less or equal to one. Therefore, the voltage amplitude of the outputs is small compared...
Recently, six-switch dual-terminal inverter (SSDTI) has been proposed as a reduced switch count converter which employs less number of semiconductor devices compared with former dual-terminal inverters proposed so far in the literature. The sinusoidal pulse width modulation (SPWM) is the only switching method which has been presented for this inverter. In this paper a space vector modulation (SVM)...
Active topologies based on the Switched-Capacitor converters (SCC) are used for battery cell balancing because they eliminate magnetic elements effectively. In addition, these converters have easier implementation, integration capability, and reduced size. Despite of all these benefits, SCCs suffer from some disadvantages such as increased number of active switches, edge current, low balancing speed,...
Today there are numerous companies in Iran manufacturing Uninterruptible Power Supplies (UPS). However, in medium and high power range they manufacture online double conversion transformer based UPSs, with thyristor controlled rectifier. In this paper the power topology, control algorithm and experimental results of the first commercial active front end 30 KVA transformerless UPS in Iran is presented.
This paper focuses on a robust state feedback controller design strategy for a single phase inverter with an output lowpass filter. State space representation of the single phase DC/AC converter was presented by assuming the load as an exsanguinous disturbance input modeled as a current source in parallel with an uncertain linear load. According to norm-bounded linear differential inclusion (NLDI)...
Five-level active neutral-point clamped (5L-ANPC) converter is an interesting topology for high-power mediumvoltage motor drives. In addition to a neutral point potential in the DC-link, it has a flying capacitor in each phase. Controlling these internal inverter voltages while producing desired torque and flux for the motor is a challenging control problem. In published articles that use model predictive...
In this paper, a new approach for optimizing the LLC resonant converter for achieving maximum efficiency in a desired load is proposed. Generally, the optimum value of the load is chosen near the full load condition to reduce the converter overall cost and consumption. Beside the inductor and transformer core and copper losses, the conduction and switching losses of the power switches and diodes and...
In this paper a new control method is introduced for grid-connected inverter (GCI) to inject sinusoidal current to grid in presence of nonlinear load and distorted grid voltage conditions. The proposed control method consists of two parts: current reference generation and current controller. To generate current reference, a new algorithm, based on Recursive Discrete Fourier Transform, is proposed...
Switched-capacitor converters (SCC) are electromagnetic component less converters in their power stage for converting or transforming electrical power. But, they only use capacitors in the power stage as the power storage or power transformer component. Low volume, high power density, and integration ability are the most important features of these converters. Among various active cell balancing topologies,...
Ferroresonant car battery charger poses a major challenge because of low efficiency and power factor. Also these chargers have very big size and weight. In this paper, a PFC and flyback converters for 84 W AC-DC car battery chargers is design. To reduce the converters switching losses and improve its efficiency, critical conduction mode and valley switching technique are used to control the PFC and...
Electromagnetic elements such as inductance are not used in switched-capacitor converters to convert electrical power. In contrast, capacitors are used for storing and transforming the electrical power in these new topologies. Lower volume, higher power density, and more integration ability are the most important features of these kinds of converters. In this paper, the most important switched-capacitor...
In this paper, a control algorithm based on Recursive Discrete Fourier Transform (RDFT) is proposed for 3-phase, 4-leg shunt active power filter (APF) to prevent harmonic currents, compensate reactive power and neutral line current and balance the load currents under unbalanced non-linear load and nonideal mains voltage conditions. The APF is composed of a 4-leg voltage source inverter (VSI) with...
This paper presents a new circuit topology for electromagnetic stirring (EMS) systems based on Z-Source inverter that can boost voltage while lowers the harmonic distortion of rectifier input current. Z-Source modulation index can control the output voltage of inverter proportional with load changing in EMS systems. Simulations were carried out and the results show the performance of proposed circuit...
Nowadays, applications of DC-AC inverters in various applications such as hybrid electric vehicles are growing up. DC-DC converters are one of the important parts of the HEVs. Dual output DC-AC inverters can be used in them. If a multi input-multi output inverter be used, then the DC-DC converter should be able to prepare the inputs for that. This paper proposes a new bi-directional DC/DC converter...
In this paper, design considerations of a wind energy conversion system including permanent magnet synchronous generator (PMSG), Vienna rectifier and four-switch three-phase inverter (B4) is investigated. Vienna rectifier is used as PMSG generator side converter to rectify AC output voltage of PMSG wind generator and to build two equal DC voltages. The B4 inverter injects the active and reactive power...
Compared to the conventional selective harmonic elimination-pulse width modulation (SHE-PWM), the selective harmonic elimination-pulse width and amplitude modulation (SHE-PWAM) control strategy results in significant improvements in the performance of CHB inverters. This fact is due to considering the optimization of the CHB dc sources' values along with the optimized switching angles. This paper...
This paper presents a new configuration for wind energy conversion system using Permanent magnet synchronous generator (PMSG-based WECS) via Vienna rectifier and three phase four switch inverter (B4). The motivation of this work is the need for a low power cost effective topology for PMSG-based WECS. In this PM WECS, Vienna rectifier is used as generator-side converter and B4 inverter is employed...
Due to variable IPT magnetic parameters in EV charger applications, transferred power is not always at maximum levels. This paper proposes a novel algorithm that tracking the maximum transferred power frequency by using measurable variables of the primary circuit. Inductive power transfer (IPT) systems are attractive for Electric Vehicle charger. However the major problem of the IPT systems is large...
In this study, a new multi-input converter with two dc inputs and one single phase ac output is proposed, which dc/dc converters are able to operate in buck and boost modes. Both dc/dc and dc/ac part works simultaneously with minimum limitation on the operating function of the other parts. The proposed converter structure and operating principle in all operation modes are presented and discussed....
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