A pulsewidth-modulated inverter with parallel connected transistors using current-sharing reactors

Matsui, Kunihiko; Murai, Yuichi; Watanabe, Makoto; Kaneko, Mineo; Ueda, Fukashi

doi:10.1109/63.223970

Cited by 129 publications

(40 citation statements)

References 3 publications

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“…Fig. 7 shows the gate signals for all twelve switches of the two inverters for operation in the first sector of the SVPWM scheme, with the switching periods, T 1 , T 2 , and T 0 , calculated using equation (10). The converter switches are supplied with zero logic states for the periods during which the converter is deactivated.…”

Section: Simulation Resultsmentioning

confidence: 99%

“…These approaches will lead to increased system size and cost, and reduced efficiency (due to the extra core and copper losses when an isolation transformer is employed). An alternative approach is to utilize inter-module current sharing reactors on the output terminals of each inverter in order to provide a high impedance in the circulating current loop [10], [11]. However, this option will not provide a solution to the flow of low frequency circulating currents and it adds considerably to the cost and size of the system.…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Control of Parallel Connected Three-Phase PWM Converters without Inter-Module Reactors

Jassim¹,

Zahawi²,

Atkinson³

2015

Journal of Power Electronics

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This paper presents a new current sharing control strategy for parallel-connected, synchronised three-phase DC-AC converters employing space vector pulse width modulation (SVPWM) without current sharing reactors. Unlike conventional control methods, the proposed method breaks the paths of the circulating current by dividing the switching cycle evenly between parallel connected equally rated converters. Accordingly, any inter-module reactors or circulating current control will be redundant, leading to reductions in system costs, size, and control algorithm complexity. Each converter in the new scheme employs a synchronous dq current regulator that uses only local information to attain a desired converter current. A stability analysis of the current controller is included together with a simulation of the converter and load current waveforms. Experimental results from a 2.5kVA test rig are included to verify the proposed control method.

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Section: Simulation Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Control of Parallel Connected Three-Phase PWM Converters without Inter-Module Reactors

Jassim¹,

Zahawi²,

Atkinson³

2015

Journal of Power Electronics

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“…The size reduction achieved by the magnetic integration is demonstrated by comparing the volume of the proposed solution with the volume of the magnetic components of the system proposed in [1], [20] and also shown in Fig. 2(b).…”

Section: Finite Element Analysis and Comparative Evaluationmentioning

confidence: 99%

Magnetic Integration for Parallel Interleaved VSCs Connected in a Whiffletree Configuration

Gohil

Bede

Teodorescu

et al. 2016

IEEE Trans. Power Electron.

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Abstract-The Voltage Source Converters (VSCs) are often connected in parallel to realize a high current rating. In such systems, the harmonic quality of the output voltage can be improved by interleaving the carrier signals of the parallel VSCs. However, an additional inductive filter is often required to suppress the circulating current that flows between the parallel interleaved VSCs. One of the ways to deal with the circulating current problem is to use the coupled inductors in a whiffletree configuration. This paper proposes the integration of the line filter inductor and the circulating current filter inductor in a single magnetic component for such systems. The fundamental frequency component of the flux is mostly confined to the limbs around which the coils are placed, whereas other parts of the magnetic structure only experiences high frequency flux excitation. As a result, the integrated inductor can be made smaller and the power density of the overall converter system can be increased. The magnetic structure of the integrated inductor is analyzed and performance is verified by simulation and experimental studies.

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“…The following ZSCC equation can be obtained by adding the three equations from (1) together and substituted by (2) and (3):…”

Section: Fig1 Structure Of Proposed Parallel Systemmentioning

confidence: 99%

“…Before 2002, methods concerning ZSCC between parallel inverters with common AC and DC buses are high impedance methods [2] [3] and synchronized control methods [4] [5]. However, in the high impedance approach, the overall parallel system is bulky and costly because of additional reactors in main circuit.…”

Section: Introductionmentioning

confidence: 99%

Elimination of zero sequence circulating current between parallel operating three-level inverters

Wang

Dong

et al. 2016

IECON 2016 - 42nd Annual Conference of the IEEE Industrial Electronics Society

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Abstract-In order to suppress the zero sequence circulating currents (ZSCCs) between parallel operating three level voltage source inverters with common AC and DC buses, a common mode voltage reduction PWM (CMVR-PWM) technique and neural point potentials (NPPs) control based method is proposed in this paper. An equivalent model of ZSCC is developed, and two excitation sources of ZSCC, differences of common mode voltages (CMVs) and NPPs between paralleled inverters, are analyzed. A CMVR-PWM method is investigated to reduce the CMV, and a simple electric circuit is adopted to control the NPPs. With this two strategies, ZSCCs between parallel inverters can be eliminated effectively. This strategy has the advantage of without carrier synchronization and can be utilized to parallel operating inverters with different types of filter. Simulation result validate the proposed ZSCC elimination schemes.

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A pulsewidth-modulated inverter with parallel connected transistors using current-sharing reactors

Cited by 129 publications

References 3 publications

Control of Parallel Connected Three-Phase PWM Converters without Inter-Module Reactors

Control of Parallel Connected Three-Phase PWM Converters without Inter-Module Reactors

Magnetic Integration for Parallel Interleaved VSCs Connected in a Whiffletree Configuration

Elimination of zero sequence circulating current between parallel operating three-level inverters

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