Multi-Level Voltage Source Parallel Inverters using Coupled Inductors

Singh, Sukhjit; Salmon, John

doi:10.1109/compel.2019.8769636

Cited by 13 publications

(3 citation statements)

References 31 publications

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“…In this method, since the DC voltage must be controlled by each inverter, as many voltage sensors as the number of parallel inverters are required, such that the system becomes complicated. On the other hand, there is a method of disposing passive elements having a high impedance, such as coupled inductors in the circulating current path [14,22]. In this method, as the number of inverters connected in parallel increases, the system becomes more complex and the volume also increases.…”

Section: Introductionmentioning

confidence: 99%

“…The method of using the LCL filters for the outputs of individual inverters can be hardly used universally because the optimal design must vary according to the field of application. Although the circulating currents can be suppressed by controlling the circulating currents with software using active control such as proportional and integral (PI) and proportional and resonant (PR) control, it is not suitable for controlling the high frequency circulating currents in the switching frequency band due to the limitation of the control bandwidth [18][19][20][21][22][23][24][25][26]. Therefore, in order to reduce the circulating currents due to the carrier phase errors, a new appropriate control method is necessary.…”

Section: Introductionmentioning

confidence: 99%

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The Circulating Current Reduction Control Method for Asynchronous Carrier Phases of Parallel Connected Inverters

Lee

Jung

2022

Energies

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Parallel operation of inverters is one of the most effective and representative ways to increase system capacity. However, zero-sequence circulating currents occur due to the practical deviations of components constituting individual inverters in case of parallel connected inverters in which a common direct current (DC) or alternating current (AC) bus is shared. In particular, circulating currents of the high-frequency component as well as those of the low-frequency component are generated due to the asynchronization of the carriers of individual inverters. In order to suppress the circulating currents as such, the phases of the carriers should be shifted as much as the phase errors between the carriers to compensate for the phase errors. A difficulty in this phase compensation control is that when there are several pulse-width modulation (PWM) carriers, it is impossible to identify the phase of each carrier. In this paper, to overcome the problem, a method to specify the position of one of the many carriers and control the carriers and compensate for phase errors based on the relevant phase was proposed. In addition, this paper includes the analysis of circulating currents generated in the case of carrier phase errors and proposes a method to identify carrier phase errors and compensate for the relevant errors. The proposed method was verified through simulations and experiments.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

The Circulating Current Reduction Control Method for Asynchronous Carrier Phases of Parallel Connected Inverters

Lee

Jung

2022

Energies

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“…Generally speaking, the main problem that restricts advanced optimization algorithms from getting good results is that the tuning of control loops is required to tune one loop at a time manually, which tends to be a difficult and time-consuming process, especially in the traditional tuning of these control loops. To deal with this issue, the paper [12] developed a 4-levels PWM rectifier and was the first to examine such a PWM-based 3-phase rectifier with an N-level (N>3). The majority of solutions of earlier initiated multilayer rectifiers (MLR) were limited to up to 5-level or either single phase, for example, the MLR introduced by [13].…”

Section: Introductionmentioning

confidence: 99%

Design of a closed-loop autotune PID controller for three-phase for power factor corrector with Vienna rectifier

Almamoori¹,

Dziadak

Sabry

2022

Bulletin EEI

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A closed-loop auto-tuner proportional integral derivative (PID) controller for tuning the DC-link voltage, voltage neutral controllers, and DQ axis current for a power factor corrector with Vienna rectifier is developed and discussed in this study. In traditional tuning of these control loops, it is needed to tune one loop at a time manually, which tends to be a difficult and time-consuming process. In this work, we add a closed-loop PID auto-tuner in the control design will help to simplify and speed up this process by tuning all the 4 PID controllers in a single simulation running in a closed loop. Essentially, it runs auto-tuning experiments for the DQ axis -current, output voltage, and neutral point voltage loops by injecting perturbations; recording the output; estimating the plant frequency response, and tuning the PI controller parameters. In DQ-axis control, projections are used to convert time-based3-phase currents into a time invariant 2-coordinate vector. The results after adding the auto-tuner show that the response time improved considerably when the balanced load was introduced with the individual loads being connected. The results show that the neutral point voltage controller did a good job of keeping the voltage neutral point stable compared to the older controller gains.

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Multi-Level Power Converters using Coupled Inductors and Parallel Connected 2-Level Inverters

Singh

Takongmo

Salmon

2020

2020 IEEE Applied Power Electronics Conference and Exposition (APEC)

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Multi-Level Voltage Source Parallel Inverters using Coupled Inductors

Cited by 13 publications

References 31 publications

The Circulating Current Reduction Control Method for Asynchronous Carrier Phases of Parallel Connected Inverters

The Circulating Current Reduction Control Method for Asynchronous Carrier Phases of Parallel Connected Inverters

Design of a closed-loop autotune PID controller for three-phase for power factor corrector with Vienna rectifier

Multi-Level Power Converters using Coupled Inductors and Parallel Connected 2-Level Inverters

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