Cross-circulating current suppression method for parallel three-phase two-level inverters

Wei, Baoze; Guerrero, Josep M.; Guo, Xiaoqiang

doi:10.1109/icce-berlin.2015.7391297

Cited by 4 publications

(4 citation statements)

References 23 publications

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“…Thus, the values at k + 2 depend on the values at k + 1, which also depend on the values at k, and so forth. In Equation (31), all the variables can be predicted, except output current ioα ꞵ (k + 1) because it depends on the load connected at the output. Moreover, this variable would be measured and not calculated.…”

Section: Stepmentioning

confidence: 99%

“…. From Equation (31), the input variables and their controlled input, u(k), are expressed as follows: It is important to note that Equation ( 31) is a recursive equation, which means that to find the values at k + 2, one must obtain the values at k + 1 first. Thus, the values at k + 2 depend on the values at k + 1, which also depend on the values at k, and so forth.…”

Section: Stepmentioning

confidence: 99%

“…To reduce low-frequency circulating current in order to ensure system stability, an improved droop control with a voltage drop compensator was suggested in [30], and a proportional-resonant controller was used in [23]. A control technique based on virtual impedance for the suppression of cross-circulating current, as presented in [31], is also one of the solutions.…”

mentioning

confidence: 99%

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Decentralized Virtual Impedance Control for Power Sharing and Voltage Regulation in Islanded Mode with Minimized Circulating Current

Khan,

Zulkifli,

Tutkun

et al. 2024

Electronics

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In islanded operation, precise power sharing is an immensely critical challenge when there are different line impedance values among the different-rated inverters connected to the same electrical network. Issues in power sharing and voltage compensation at the point of common coupling, as well as the reverse circulating current between inverters, are problems in existing control strategies for parallel-connected inverters if mismatched line impedances are not addressed. Therefore, this study aims to develop an improved decentralized controller for good power sharing with voltage compensation using the predictive control scheme and circulating current minimization between the inverters’ current flow. The controller was developed based on adaptive virtual impedance (AVI) control, combined with finite control set–model predictive control (FCS-MPC). The AVI was used for the generation of reference voltage, which responded to the parameters from the virtual impedance loop control to be the input to the FCS-MPC for a faster tracking response and to have minimum tracking error for better pulse-width modulation generation in the space-vector form. As a result, the circulating current was maintained at below 5% and the inverters were able to share an equal power based on the load required. At the end, the performance of the AVI-based control scheme was compared with those of the conventional and static-virtual-impedance-based methods, which have also been tested in simulation using MATLAB/Simulink software 2021a version. The comparison results show that the AVI FCS MPC give 5% error compared to SVI at 10% and conventional PI at 20%, in which AVI is able to minimize the circulating current when mismatch impedance is applied to the DGs.

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Section: Stepmentioning

confidence: 99%

Section: Stepmentioning

confidence: 99%

mentioning

confidence: 99%

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Decentralized Virtual Impedance Control for Power Sharing and Voltage Regulation in Islanded Mode with Minimized Circulating Current

Khan,

Zulkifli,

Tutkun

et al. 2024

Electronics

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“…In [32], the parallelism control is applied to a UPS-based system. In [33], the authors analyzed a method to suppress the cross-circulating current based on virtual impedance. In [34], the authors presented a new wireless load-sharing control method that is designed to improve the performances of the parallel-connected inverters.…”

Section: Introductionmentioning

confidence: 99%

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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Circulation Suppression of Parallel Inverter System with Shared DC Bus

Fu,

Yang,

et al. 2023

2023 Power Electronics and Power System Conference (PEPSC)

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Cross-circulating current suppression method for parallel three-phase two-level inverters

Cited by 4 publications

References 23 publications

Decentralized Virtual Impedance Control for Power Sharing and Voltage Regulation in Islanded Mode with Minimized Circulating Current

Decentralized Virtual Impedance Control for Power Sharing and Voltage Regulation in Islanded Mode with Minimized Circulating Current

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

Circulation Suppression of Parallel Inverter System with Shared DC Bus

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