Investigations in the Modeling and Control of a Medium-Voltage Hybrid Inverter System That Uses a Low-Voltage/Low-Power Rated Auxiliary Current Source Inverter

Low power grid-tied photovoltaic (PV) generation systems increasingly use transformerless inverters. The elimination of the transformer allows smaller, lighter and cheaper systems, and improves the total efficiency. However, a leakage current may appear, flowing from the grid to the PV panels through the existing parasitic capacitance between them, since there is no galvanic isolation. As a result, electromagnetic interferences and security issues arise. This paper presents a novel transformerless single-phase Current Source Inverter (CSI) topology with a reduced inductor, compared to conventional CSIs. This topology directly connects the neutral line of the grid to the negative terminal of the PV system, referred as common mode configuration, eliminating this way, theoretically, the possibility of any leakage current through this terminal. The switches control is based on a hysteresis current controller together with a combinational logic circuitry and it is implemented in a digital platform based on National Instruments Technology. Results that validate the proposal, based on both simulations and tests of a low voltage low power prototype, are presented.

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Current-Source Converter Based STATCOM: Modeling and Control

IEEE Transactions on Power Delivery ◽

10.1109/tpwrd.2004.837838 ◽

2005 ◽

Vol 20 (2) ◽

pp. 795-800 ◽

Cited By ~ 66

Author(s):

Y. Ye ◽

M. Kazerani ◽

V.H. Quintana

Keyword(s):

Current Source ◽

Modeling And Control ◽

Current Source Converter ◽

And Control

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A Highly Efficient and Reliable Power Scheme Using Improved Push-Pull Forward Converter for Heavy-Duty Train Applications

Journal of Advanced Computational Intelligence and Intelligent Informatics ◽

10.20965/jaciii.2016.p0342 ◽

2016 ◽

Vol 20 (2) ◽

pp. 342-354 ◽

Cited By ~ 1

Author(s):

Liran Li ◽

◽

Zhiwu Huang ◽

Heng Li ◽

Xiaohui Qu ◽

...

Keyword(s):

Low Voltage ◽

Power Converter ◽

Design Guidelines ◽

Heavy Duty ◽

Wheel Wear ◽

Brake Shoe ◽

Modeling And Control ◽

Forward Converter ◽

High Impedance ◽

And Control

Electronically controlled pneumatic (ECP) brake systems have become popular in heavy-duty train applications because of their advantages, which include shorter stopping distances, improved handling, and less brake-shoe and wheel wear. In ECP brake systems, an improved power supply is required to support efficient and reliable operations. In this paper, we propose a new power converter for ECP brake systems, which is derived from a conventional push-pull converter. As opposed to conventional push-pull converters, we insert a clamping capacitor into the proposed circuit. This clamping capacitor simultaneously enables a greater number of operation modes for the proposed converter and absorbs the voltage spikes in the switch. The proposed converter is more suited for ECP brake applications that require high power, low voltage ripple, and high impedance. We theoretically analyze the proposed converter, and present the design guidelines. Further, we discuss the modeling and control aspects. We demonstrate the operations of the proposed model by performing both simulations and experiments.

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A Generalized Three-Phase Multilevel Current-Source Inverter Topology

Applied Mechanics and Materials ◽

10.4028/www.scientific.net/amm.88-89.373 ◽

2011 ◽

Vol 88-89 ◽

pp. 373-378

Author(s):

Jian Yu Bao ◽

Wei Bing Bao ◽

Zhong Chao Zhang

Keyword(s):

Control Strategies ◽

Current Source ◽

Voltage Source ◽

Output Current ◽

Current Source Inverter ◽

Multilevel Structure ◽

Three Phase ◽

Dc Current ◽

And Control ◽

Inverter Topology

A generalized three-phase multilevel current-source inverter (MCSI) topology is proposed by implanting the generalized N-level current cells into a three-phase MCSI topology which is derived from the three-phase multilevel voltage-source inverter (MVSI) topology through dual conversion. In the generalized three-phase MCSI topology, each intermediate dc-link current level can be automatically balanced without adding any external circuits, thus a true multilevel structure is provided. Output current of each phase is independently modulated because of being supplied with two DC current-sources. This allows the wealth of existing knowledge relating to the operations, modulations and control strategies of multilevel VSI to be immediately applied to such multilevel CSI. Simulation results of 5-level and 7-level CSI systems are presented to verify the proposed three-phase MCSI topology.

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