Dynamic Circulating Current Suppression Method for Multiple Hybrid Power Parallel Grid-Connected Inverters With Model Reference Adaptive System

Liu, Jiang; Sun, Xiaodong; Ren, Biying; Zhang, Qi

doi:10.1109/tie.2021.3084166

Cited by 15 publications

(6 citation statements)

References 33 publications

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“…In addition, problems such as voltage collapse, power oscillations, and circulation inrush currents can cause black-out in the microgrids and GFIs [100], [102]. Therefore, problems that may occur in loading conditions after synchronization may adversely affect the frequency and voltage stability of the island-mode microgrid [99], [101].…”

Section: Commissioning or Loading Of Grid-forming Inverters After Syn...mentioning

confidence: 99%

“…Islanded Microgrids and GFIs operate under weak grid conditions in synchronization and starting or loading processes [18], [22], [100]. For this reason, it is critical to overcome the problems that may occur in loading conditions after synchronization [101]. After any synchronization algorithm is completed, the synchronization switch must be closed mechanically.…”

Section: Introductionmentioning

confidence: 99%

“…[38], [48]. It can be difficult for the GFIs to take on a load without causing issues such as voltage collapse or circulating currents in the islanded microgrid and each other GFIs [58], [73], [72], [78], [101], [102]. It can also adversely affect the frequency and voltage stability of the islanded microgrid [34], [49], [99], [100], [101].…”

Section: Introductionmentioning

confidence: 99%

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Frequency, Phase, and Magnitude Difference Locked-Loop Based Linear Synchronization Scheme for Islanded Inverters and Microgrids

Atmaca

Karabacak

2023

IEEE Access

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In recent years, integrating renewable energy sources (RESs) has achieved significant attention due to the growing demand for sustainable energy solutions. Inverter-interfaced Islanded Microgrids (IGs) have appeared as an advantageous approach to integrating RESs into the power grid. Grid-forming inverters (GFIs) are a critical component of IGs, and their synchronization is essential for stable and reliable operation. The literature has widely proposed soft transition, pre-synchronization, and re-synchronization to synchronize IGs to the main grid. However, methods for synchronizing GFIs in the islanded microgrid are restricted. Parallel operation of GFIs is required to guarantee the high-power demand of IG and improve voltage-frequency stability. For parallel operation, GFIs must be synchronized with each other. In the conventional synchronization control systems that are highly nonlinear, the linear proportional-integral (PI) controllers are commonly used in synchronization loops without considering the nonlinearity resulting from the initial condition dependency and cross-coupling. Thus, conventional synchronization methods can be exposed to concerns of stable operation, narrow operation area, and performance degradation. This study proposes a new linearized synchronization control system for GFIs in IGs. In this way, it is possible to analytically design robust linear controllers and ensure a stable operation, high performance, and wide (full) operation area. In addition, a new soft-commissioning method is proposed to deactivate synchronization loops and soft-start the synced GFI. The proposed system has been tested in real-time and CHIL hardware setups for two 550 kW GFIs operating in parallel, and the results in the perfect agreement are presented in this study.INDEX TERMS Commissioning, control hardware-in-the-loop (CHIL), grid-forming inverter, islanded microgrid, load sharing, microgrid, synchronization.

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Section: Commissioning or Loading Of Grid-forming Inverters After Syn...mentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Frequency, Phase, and Magnitude Difference Locked-Loop Based Linear Synchronization Scheme for Islanded Inverters and Microgrids

Atmaca

Karabacak

2023

IEEE Access

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“…But it suffers from slow responses and external disturbances. In order to improve its control performance, a virtual impedance droop control approach was proposed in [17]. Its idea is to introduce a reactive power feedback term into the virtual impedance so that the influence of line impedance on the output reactive power distribution of parallel systems can be eliminated.…”

Section: Introductionmentioning

confidence: 99%

Composite Sliding Mode Control of Phase Circulating Current for the Parallel Three-Phase Inverter Systems

Zhang,

Wang,

Han

et al. 2024

Energies

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The phase circulating current (PCC) of the parallel three-phase inverter systems dramatically affects the power quality and conversion efficiency of the power grid. In this paper, a composite suppression strategy is proposed to solve the PCC issue by using the sliding mode control (SMC) approach and improved virtual impedance droop control. Taking the commonly used 2-group parallel three-phase inverter as an example, an inter- and intra-classification model is established by analyzing the sources of PCC. In order to suppress the inter-PCC, the traditional virtual impedance droop control is given, following the improved substitute by combining SMC. And the variables of the bus voltage, Q-U loop, P-f loop, and the virtual-induced reactance are also introduced for the robust control of the impedance droop. On the other side, a SMC-based suppression approach is designed to solve the issue of the intra-PCC. Its idea is to introduce a regulation factor for the space vector pulse width modulation (SVPWM) so that the zero-sequence voltage can be eliminated and the influence of the intra-PCC can be relieved. Comparative simulations and experiments validate the effectiveness of the methods proposed in this paper.

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“…Interaction mechanisms and stability boundary of paralleled VSCs under different current injections were carried out in [28], ignoring the wind turbine dynamics. When parallel converters share the same ac and dc buses, a circulating current flows; therefore, a suppression method was proposed in [29]. The multiconverter interaction in a weak grid affects the synchronization stability; however, a feed-forward compensated PLL improves it [30].…”

Section: Introductionmentioning

confidence: 99%

Dynamic Interactions and Stabilization of Weak Grid-Tied Parallel VSCs and Parallel CSCs Systems Considering PVG Dynamic Resistance

Rahman,

Mohamed

2024

IEEE Open J. Power Electron.

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The parallel operation of power converters is essential to meet increased power demands. However, due to dynamic coupling, the instability in one converter can affect the stability of another. Therefore, this paper analyses the interaction and stability differences among the weak grid-tied photovoltaic (PV)-interfaced parallel voltage-and current-source converters (VSCs and CSCs) considering the PV generator (PVG) dynamics. Moreover, the impacts of the changing PVG operating points from the constant-voltage to a constant-current region (CVR to a CCR) and changing control parameters on converters' dynamic interaction are studied and compared in both cases. It is found that parallel VSCs dc-links suffer from low-frequency (<60 Hz) compared to high-frequency oscillations (>200 Hz) in parallel CSCs at the CCR with a short-circuit ratio (SCR) of 2.5. Moreover, the oscillation magnitude of injected power is higher in parallel VSCs compared to the parallel CSCs at SCR=1.2. Therefore, a stabilization method is proposed for both systems to ensure reduced interactions and stable operation in the CVR, CCR, and maximum power regions at weak and very weak grid conditions. Finally, the proposed compensators' efficacy is validated via detailed nonlinear time-domain and real-time simulation results.

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Dynamic Circulating Current Suppression Method for Multiple Hybrid Power Parallel Grid-Connected Inverters With Model Reference Adaptive System

Cited by 15 publications

References 33 publications

Frequency, Phase, and Magnitude Difference Locked-Loop Based Linear Synchronization Scheme for Islanded Inverters and Microgrids

Frequency, Phase, and Magnitude Difference Locked-Loop Based Linear Synchronization Scheme for Islanded Inverters and Microgrids

Composite Sliding Mode Control of Phase Circulating Current for the Parallel Three-Phase Inverter Systems

Dynamic Interactions and Stabilization of Weak Grid-Tied Parallel VSCs and Parallel CSCs Systems Considering PVG Dynamic Resistance

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