Circulating current in parallel connected inverter system

Roslan, Muhamad Akhmal Hakim; Ahmad, Mohd Azmier; Isa, Muzamir; Rahman, N. H. A.

doi:10.1109/pecon.2016.7951554

Cited by 8 publications

(5 citation statements)

References 5 publications

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“…Reference [27] studied the circulating currents produced by phase shifting between the pulse with modulation (PWM) carrier signals of two inverters connected in parallel. Reference [28] studied the effects that appear when the fundamental voltages produced by several inverters working in island mode have different phases and frequencies.…”

Section: The Problem Of Circulating Currents and The Main Contributio...mentioning

confidence: 99%

Experimental Study of the Parameter Mismatch Effects on the Low Frequency Circulating Currents of Parallel Three Phase Inverters

Liberos,

González-Medina,

Patrao

et al. 2023

Eng

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When converters are connected in parallel, a system with some benefits, including modularity and redundancy, is obtained. However, in these circumstances, circulating currents can appear that produce some adverse effects. In this work, a study of the low-frequency circulating currents that appear in three-phase inverters connected in parallel is performed. The study is focused on the effects produced by the parameter mismatch, namely inductance mismatches, power imbalance, and the use of different pulse with modulation (PWM) techniques. The nature of the circulating current produced by each of these factors were analyzed separately. Both simulation and experimental results are shown, which were obtained using a three-phase 10-kW prototype composed of two 5-kW inverters connected in parallel.

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Section: The Problem Of Circulating Currents and The Main Contributio...mentioning

confidence: 99%

Experimental Study of the Parameter Mismatch Effects on the Low Frequency Circulating Currents of Parallel Three Phase Inverters

Liberos,

González-Medina,

Patrao

et al. 2023

Eng

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“…The circulating current has been defined as the difference between the output current of each inverter and the average current (that is the sum of the outputs current divided by the number of inverters) [24]:…”

Section: Circulating Current Phenomenonmentioning

confidence: 99%

“…Not respecting this requirement leads to crosscurrent or circulating current between the inverters with the effect of reducing power efficiency and system reliability. The circulating current behavior in multiparallel connected inverters has been widely discussed in [24][25][26][27]. In [24], the authors studied the effect of this current in a system with two inverters and in a more general case of N inverters.…”

Section: Introductionmentioning

confidence: 99%

“…The circulating current behavior in multiparallel connected inverters has been widely discussed in [24][25][26][27]. In [24], the authors studied the effect of this current in a system with two inverters and in a more general case of N inverters. In both cases, they reported that the phenomenon exists if there is a difference in the output voltage phase or frequency.…”

Section: Introductionmentioning

confidence: 99%

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Study of a Synchronization System for Distributed Inverters Conceived for FPGA Devices

Saccenti

Bianchi

Munari

2021

ASI

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In a multiple parallel-connected inverters system, limiting the circulating current phenomenon is mandatory since it may influence efficiency and reliability. In this paper, a new control method aimed at this purpose and conceived to be implemented on a Field Programmable Gate Array (FPGA) device is presented. Each of the inverters, connected in parallel, is conceived to be equipped with an FPGA that controls the Pulse-Width Modulation (PWM) waveform without intercommunication with the others. The hardware implemented is the same for every inverter; therefore, the addition of a new module does not require redesign, enhancing system modularity. The system has been simulated in a Simulink environment. To study its behavior and to improve the control method, simulations with two parallel-connected inverters have been firstly conducted, then additional simulations have been performed with increasing complexity to demonstrate the quality of the algorithm. The results prove the ability of the method proposed to limit the circulating currents to negligible values.

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“…These inverters act in regulating the voltage; amplitude and frequency, instead of different mode of operation like other converter [7]; besides providing the required current needed. However, the issue of power quality [8] that contributed by the existence of transient circulating current in line impedance [9] will lead to the system instability, thus can harmful the inverters [10] due to mismatch of the output voltage. In an islanded microgrid, loads must be properly shared by multiple DG units.…”

mentioning

confidence: 99%

Droop control technique for equal power sharing in islanded microgrid

Husna¹,

Roslan²,

Mat³

2019

IJPEDS

Self Cite

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This paper presents a droop control technique for equal power sharing in islanded microgrid. In this study, the proposed controller is based on the frequency droop method, is applied to a robust droop controller in parallel connected inverters. The previous robust droop controller deals with voltage droop method. A modification has been formed against this controller by adding a fuzzy logic controller with the frequency droop method. The only sharing error which is concentrated in this paper is the error in sharing the rated frequency among the inverters. By adapting fuzzy in the robust droop, it tries to eliminate the frequency error, hence that the frequency reference of the inverters keeps maintain at 50Hz. A derivation of generalized models of a single-phase parallel-connected inverter system is shown. The simulation results show that the proposed controller with FLC is able to improve the stability of frequency reference and the performance of power sharing between the inverters under the inductive line impedance.

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Circulating current in parallel connected inverter system

Cited by 8 publications

References 5 publications

Experimental Study of the Parameter Mismatch Effects on the Low Frequency Circulating Currents of Parallel Three Phase Inverters

Experimental Study of the Parameter Mismatch Effects on the Low Frequency Circulating Currents of Parallel Three Phase Inverters

Study of a Synchronization System for Distributed Inverters Conceived for FPGA Devices

Droop control technique for equal power sharing in islanded microgrid

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