Unified Control (UniCon) Strategies for Grid-Connected Inverters

Miranbeigi, Mohammadreza; Kandula, Prasad; Divan, Deepak

doi:10.1109/ecce47101.2021.9595967

Cited by 9 publications

(4 citation statements)

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“…This control strategy was proposed in [142] and demonstrated in [143] to showcase the need for collaborative and autonomous operation of inverters in the grid-connected mode for future grids. The controller was designed to tackle the problematic inverterbased grids faced with low inertia, controller interactions, instabilities, failure susceptibility, resonances, network dynamics, and transient overloads.…”

Section: Universal Control Scheme (Unicon)mentioning

confidence: 99%

Grid-Forming Control: Advancements towards 100% Inverter-Based Grids—A Review

Ebinyu,

Abdel-Rahim,

Mansour

et al. 2023

Energies

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Changes are being implemented in the electrical power grid to accommodate the increased penetration of renewable energy sources interfaced with grid-connected inverters. The grid-forming (GFM) control paradigm of inverters in active power grids has emerged as a technique through which to tackle the effects of the diminishing dominance of synchronous generators (SGs) and is preferred to the grid-following (GFL) control for providing system control and stability in converter-dominated grids. Therefore, the development of the GFM control is important as the grid advances towards 100% inverter-based grids. In this paper, therefore, we aim to review the changing grid scenario; the behaviour of grid-connected inverter control paradigms and major GFM inverter controls, including their modifications to tackle low inertia, reduced power quality, fault-ride through capability, and reduced stability; and the state-of-the-art GFM models that are pushing the universality of GFM inverter control.

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Section: Universal Control Scheme (Unicon)mentioning

confidence: 99%

Grid-Forming Control: Advancements towards 100% Inverter-Based Grids—A Review

Ebinyu,

Abdel-Rahim,

Mansour

et al. 2023

Energies

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“…These differ according to islanded and grid-connected operations. In grid-connected operations, the frequency and voltage of microgrid follow the frequency and voltage of the main grid, and variation is within a very small range [60], [72], [73], [74]. In islanded mode operations, frequency, phase, and voltage values constantly change due to droop control in sudden load changes [10], [54], [75], [76], [77].…”

Section: Introductionmentioning

confidence: 99%

“…The cross-coupling occurs due to the simultaneous operation of PSL and VSL [89], [90]. In this case, it occurs voltage collapse and frequency oscillations [31], [33], [69], [71], [73]. The initial condition dependence and cross-coupling cause the conventional synchronization control system to be highly nonlinear [19], [20], [21], [22], [23], [57].…”

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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