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EDLCs offer high energy density and long life span, so various applications may be anticipated in the realm of energy storage devices, such as those used in electric vehicles or electric power stabilization in power systems, etc. However, since the voltage limit is low of the devices, it is necessary to connect them in series or parallel. In addition, it is required that they be used in the region...
In this paper, a single switch isolated voltage-boosting converter is presented, which is derived from the traditional flyback converter and charge pump concept. The proposed converter possesses an output inductor, so the output current is non-pulsating. Moreover, there are several advantages of the proposed converter over the traditional flyback converter, such as higher voltage conversion ratio...
The limitation of DC current injection to grid is critical for transformerless grid-connected PV inverter. In this paper a novel control strategy for three phase PV inverter is proposed in order to suppress DC current injection to the grid. It is based on idea of accurately sensing the DC offset voltage of three-phase PV inverter output. Since each one of the DC components in the three-phase inverter...
Three-port converter (TPC) topologies for renewable energy systems aim to provide higher efficiency and power density than conventional cascaded structures. This work proposes an analytical comparison of different TPC topologies for a photovoltaic LED lamp stand-alone system. A comparison using component stress factor (CSF) is performed, which gives a quantitative measure of the performance of the...
H-bridge cascaded static synchronous compensator (STATCOM) is often used to compensate the harmonic and reactive current derived from non-linear load. However, with the special topology structure, the voltage balancing of DC capacitors of H-bridge cascaded STATCOM is a key problem. Many papers adjust active voltage to solve this problem with the conventional PI controller which needs to regulate the...
There are applications like railway traction system where power converters for HVAC to MVDC or MDAC to LVDC are required with a high power/weight ratio. The conventional way is to use heavy line frequency or medium frequency transformers followed by a controlled rectifier. The availability of high voltage SiC devices has made it possible to raise the switching frequency to higher value and hence the...
Dynamic and steady-state behavior of a paralleling three-phase AC-to-DC converter with reduced dc bus capacitor and nearly unity power factor is investigated in this paper. The circuit is simulated and the simulation results are analyzed and verified by measurements. A 1.5 kW laboratory prototype with small dc bus capacitance 690 µF (0.46 µF /W) is implemented and tested to verify the feasibility...
Utilizing strings of cascaded submodules for multilevel dc/ac conversion has become well known due to the widespread popularity of the modular multilevel converter (MMC). Recently, it has been shown that these submodule strings can be adapted to achieve single-stage dc/dc conversion. Although the modular string configurations for dc/ac versus dc/dc conversion are similar, the underlying power transfer...
This paper verifies an isolated DC-AC power converter using a single phase to three phase matrix converter in experiment. A matrix converter does not require the large reactors and the large smoothing capacitors in a DC-link part. Furthermore, the proposed control method enables zero voltage switching of the matrix converter by implementing a phase shift control on the primary inverter and a pulse...
This paper discusses loss analysis formulas to achieve high efficiency and high power density for matrix converter. In this paper, the conduction loss and the switching loss of the matrix converter are derived theoretically based on virtual AC-DC-AC control method. Then, the validity of the equations is confirmed in simulation and experiment. From the experimental results, the maximum efficiency is...
Multi-level matrix converter (MMC) is a three phase ac-ac converter that can synthesize three or more levels at the output voltage while maintaining desired input power factor. In this paper a new converter, Capacitor clamped Multi-level Matrix converter (CMMC) has been proposed as an addition to the MMC family. In comparison to conventional matrix converter, the CMMC offers an additional level at...
This paper describes the design of ferrite cores on the secondary coils for the movable IPC system. The characteristics of secondary coils with various thicknesses of ferrite cores are examined analytically and the test coils are manufactured to verify the analytical results.
In this paper, an active damping control scheme using the PR (proportional and resonant) regulator is proposed to eliminate the resonance for the grid-connected T-type three-level PWM converter systems with LLCL filter by which the total inductance can be reduced compared with the conventional LCL filters. The simulation results have verified the validity of the proposed control algorithm for a 25-kW...
This study proposes a novel 5-level converter topology in which common flying capacitors (FCs) are shared by three phases. This circuit can output voltage patterns prohibited in the circuits of the previous study. Furthermore,a back-to-back (BTB) configuration can be realized by only increasing the number of the phase units of the 5-level converter. This BTB system employs common FCs for all input...
In AC/DC converters for on-board chargers, the DC-link capacitor on the output side in a power factor correction (PFC) converter uses aluminum electrolytic capacitors in order to obtain a large capacitance with low voltage ripple and small size. Therefore, it is necessary to reduce the capacitance when using film capacitors without increasing the size of the converter in order to realize a capacitor...
The contactless power transformer systems (CPTs) have recently attracted much attention as it is possible to supply electrical energy to mobile vehicles without cables. 300kW class CPT systems are required for railway vehicles power feeding applications. In this power range, there are some technical problems such as higher reactive power due to longer gap and power control at the misalignment of ground...
A control strategy for direct-drive PMSG wind generation system based on three phase current source converter (CSC-DPMSG-WGS) is presented in this paper. By the proposed method, once unbalanced grid voltage fault happens, the generator-side converter limits the power which flows to DC-link rapidly, meanwhile the grid-side converter controls the positive and negative sequence currents respectively...
This paper presents a front-to-front (FTF) system based on modular multilevel cascade converters (MMCC). It is called an FTF system because the ac sides of the MMCCs are connected together making a front-to-front configuration via a medium-frequency transformer for voltage matching and galvanic isolation. The system configuration is applicable to dc power collections. Moreover, it is suitable as a...
Permanent magnet synchronous motors have been widely used due to their high performance and high efficiency. In this paper, we talk about the control of a 750kW permanent magnet synchronous generator which is used for a hybrid turbocharger for a marine application. The controller outputs regulated 700V dc bus voltage with a voltage variation of less than 5% under 100% load transient condition to ensure...
Recently, the capacity of renewable power sources installed in small remote islands, whose power grid is isolated from large scale grid, increases because of the environmental affairs and the generation cost and so on. But in the small remote island grid, the power fluctuation caused by renewable power sources affects power grid stability and operation. In this paper, several stabilizing methods based...
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