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This paper introduces an Indirect Matrix Converter (IMC)-based Unified Power Quality Conditioner topology for a Photovoltaic (PV) system and sensitive load, with enhanced Power Quality functionalities. In particular, the proposed system is able to compensate grid voltage sags, swells and harmonics in the sensitive load, and non-linear load current harmonics in the Low-Voltage (LV) grid, in addition...
In general, analysis of Resonant Power Converters (RPCs) is more complex than conventional converters. Consequently, it is common to adopt methods that facilitate the analysis. One of them is the First Harmonic Approximation (FHA). It assumes that only the fundamental harmonic of the current/voltage quantities affects the RPC operation, thanks to the filtering action of the resonant tank network (RTN)...
This paper presents the analysis of the application of a hybrid filter (HF) in low voltage distribution systems with linear and nonlinear loads. In the proposed topology, the passive filter (PF) is tuned at third and fifth harmonics, even in situations in which the active filter (AF) is disconnected, and the AF has low rating due his distinct connection to the system. The flexibility and viability...
One of the most important power quality issues is related to current harmonics generated by nonlinear loads such as diode and thyristor front-end rectifiers. The hybrid power filter (HPF) mixes low power rating active power filter (APF) with passive filters. Recently, some APF topologies based on dual converters configurations have been shown to be very attractive where it must deal with highly nonlinear...
In this paper is proposed the integration between a Voltage Source Inverter (VSI) and a Switched Capacitor Converter (SCC) to generate a sinusoidal waveform with a double peak voltage value at the converter output terminal, without the use of a transformer or a dc-dc boost stage. Initially, VSI and SCC models are individually characterized to integrate both structures in only one topology. Between...
Conventional high power medium voltage wind energy conversion systems utilize 12-pulse converter, integrated with Y/Y/Δ front-end transformer for grid interconnection. Fairly accepted performance can be achieved even by operating the 12-pulse converter using an optimized power locus for power factor improvement. In this paper, an active filter topology is proposed using only one shunt active power...
Multipulse rectifiers are one of the solutions for current harmonics mitigation. In this paper, a novel 20-pulse full-wave AC-DC converter based in two three-to-five phases delta/zigzag transformers connected in series is proposed. A theoretical investigation of the proposed rectifier operation is presented. Afterwards this structure is simulated to obtain more real operation results. A prototype...
Traction converter with medium frequency transformer (MFT) presents current trend of modern locomotive drives topology. Traction drives based on MFT significantly reduce weight of bulky low frequency traction transformers and present modern traction converter topology. Single-phase converters connected to the AC trolley line suffer by second harmonic voltage ripple on DC side. Second harmonic on DC...
The space and packaging constraints for various electric transport applications such as for electric and hybrid electric vehicles or mass transit systems ultimately require that electronic and mechanical subsystems become more fully integrated. This paper outlines the current state of art for the power electronic converter technologies which enables greater integration in electric drives. Investigations...
This paper presents some popular multilevel converter topologies and associated modulation techniques considering advantages for electric transportation (ET) applications including electric vehicles (EVs), charging stations, wireless charging, etc. Cascaded H-Bridge (CHB), Flying Capacitors (FC) and Neutral Point Clamped (NPC) are analyzed. Moreover, mostly used switching techniques in multilevel...
High capacity of direct current is essential in many industrial processes. Conventional methods for obtaining high amount of direct current involve parallel operation of converters with multi-pulse rectifier. The multi-phase transformer combined with rectifier in the system increases overall size of the system and also provide limited control over the operation. This paper presents simpler topology...
Multilevel inverter (MLI) has various advantages such as less EMI issues, voltage stress and switching losses, it is a best choice for industrial application. In tradition inverters, Harmonics can be eliminated by using large size of filters due to the lower order harmonics. This leads to increase the overall size, volume and cost of an inverter. But in MLI, the implementation of selective harmonic...
Single phase converters are popular for grid connected applications at low power. In photovoltaic (PV) application, it is possible to remove the transformer from the PV system in order to improve the efficiency and reduce losses, size, and cost. The direct conductive connection of the grid and the DC source through transformerless PV inverter introduce a leakage current. Stray capacitance between...
In this paper, a novel topology scheme and its control strategy of photovoltaic inverter is presented. The proposed topology employ interleaving parallel connection technique and coupled-inductor (Current Sharing Reactors) into low voltage inverter to provide a multilevel voltage, increasing the output power. A close loop control method is put forward for achieving the stability and reliability of...
On the basis of the novel single-phase five-level rectifier based coupled inductor, two-octave instantaneous power of this rectifier is analyzed and the method of removing LC resonant filter circuit is proposed which can simplify the circuit structure, reduce the circuit size, and improve the power density of the rectifier. Corresponding formula derivation is carried on which shows that two-octave...
This paper analyzes the different conventional voltage source inverter (VSI) topologies for High voltage distribution system to realize Distribution Static Compensator (DSTATCOM). The reference currents are extracted through instantaneous symmetrical component theory. To check the performance of DSTATCOM for high voltage distribution system, different inverter topologies are implemented under unbalanced...
In a hybrid cascaded multilevel converter subject to different DC-link voltage levels among cascaded cells, should conventional carrier phase-shifting pulse-width modulation be applied, it will fail to multiply the equivalent switching frequency of the overall output voltage. As a consequence, this makes it more difficult to design the output filter and limits the overall output bandwidth. Based on...
This paper investigates design procedure of modular multilevel converter (MMC) in active front-end (AFE) mode of operation. The design in performed trying to minimize the amount of passive elements including arm inductances and submodule capacitances. This has been done using basic controllers needed for operation of MMC in AFE mode, without employing any additional controller in the circuit. In other...
In this paper, an analytical model has been developed to analyze the device power loss and the efficiency of a new four-level π-type converter. The efficiency of the π-type converter has been evaluated against a conventional two-level converter, three-level T-type converter as well as the three-level NPC converter. It has been found out that the four-level π-type converter has a higher efficiency...
The market of PV systems is rapidly expanding during the last years and the transformerless DC/AC inverters are key components in this evolution. Despite its design and control simplicity, a transformerless full-bridge DC/AC inverter may exhibit a high leakage ground current, due to capacitive coupling between the solar panels and ground, which prohibits its employment in single-phase PV systems....
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