Power Dynamic Decoupling Control of Grid-Forming Converter in Stiff Grid

Zhao, Fulong; Wang, Xiongfei; Zhu, Tianhua

doi:10.1109/tpel.2022.3156991

Cited by 53 publications

(57 citation statements)

References 30 publications

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“…In dominantly inductive grids (typically at higher voltages or when the system is close to a transformer), the situation is practically inverted. Understandingly, the interference of active and reactive power control in the case of mixed inductive-resistive impedances is a major control challenge, and methods for robust decoupling despite poor knowledge of the grid are under research [162] Most grid-forming concepts use droop control [163]. However, some more intricate control approaches imitate the behavior of synchronous generators in the control layer with more or less detailed models [159], [164], [165], [166], [167].…”

Section: F Grid Formingmentioning

confidence: 99%

Charging Infrastructure and Grid Integration for Electromobility

et al. 2023

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| Electric vehicle (EV) charging infrastructure will play a critical role in decarbonization during the next decades, energizing a large share of the transportation sector. This will further increase the enabling role of power electronics converters as an energy transition technology in the widespread adoption of clean energy sources and their efficient use. However, this deep transformation comes with challenges, some

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Section: F Grid Formingmentioning

confidence: 99%

Charging Infrastructure and Grid Integration for Electromobility

et al. 2023

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“…Moreover, since GFM is expected to be utilized in weak grids where GFL cannot operate stably, many previous studies have been conducted on weak grids [12]- [16]. On the other hand, there are few studies on GFM connected to stiff grids [17]- [21]. One study [17] conducted impedance-based stability analysis on GFM-Droop and revealed that GFM-Droop is likely to be unstable in stiff grids.…”

Section: Introductionmentioning

confidence: 99%

“…Moreover, [20] mentions that the real part of the eigenvalues of GFM-Droop with an inner current loop and outer current loop increase in accordance with decreasing grid impedance. Finally, [21] proposes the method of decoupling the active power control loop and the reactive power control in stiff grids. However, there remains the need for a simple and quantitative discussion about the interaction mechanism between the GFM's power synchronization control and stiff grids, as well as a corresponding design policy for the power synchronization controller.…”

Section: Introductionmentioning

confidence: 99%

Phaser-Based Transfer Function Analysis of Power Synchronization Control Instability for a Grid Forming Inverter in a Stiff Grid

Mitsugi

Baba

2023

IEEE Access

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The grid forming inverter (GFM) is considered a key technology to solve the issues of inverter-based resource (IBR)-rich grids. Many studies have investigated how GFM affects and improves power system stability. However, few studies have considered the instability of GFM as it relates to various grid conditions. This paper discusses the mechanism of power synchronization control instability of GFM by conducting transfer function analysis with focus on various grid conditions, the control logic of GFM, and relevant parameter setting. Based on the above analysis, a procedure for power synchronization controller design of GFM is proposed. Experimental tests in the control hardware in the loop (CHIL) environment are performed to verify the validity of the transfer function analysis and reveal that the instability of GFM is likely to occur when it is connected to stiff grids or experiences a larger phase delay due to a longer power measurement delay and lower damping of the controller.INDEX TERMS Droop control, grid forming inverter, hardware in the loop, small signal stability, stiff grid, transfer function, virtual synchronous generator

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“…Decreasing the PLL bandwidth has been demonstrated to increase the VSC damping in weak grid, yet it impairs the VSC response to fast grid transients [8], [17], [18]. Substituting the PLL with a power synchronization also improves the damping in weak grids, yet it may introduce stability problems in stiff grid [19], [20]. Another widely used approach is to add an active damping (AD) feedback u in the current reference of the converter main control, as shown in Fig.…”

Section: Introductionmentioning

confidence: 99%

State Feedback Reshaping Control of Voltage Source Converter

Cecati

Zhu

Pugliese

et al. 2022

IEEE Trans. Power Electron.

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Admittance reshaping is a widely used strategy to address the converters low-frequency stability issues in weak grid, caused by the PLL and its interaction with the dc and ac voltage control. However, the asymmetric control of the d-and q-axis current references and the coupling between the converter ac and dc side restricts the damping capability of Single-Input-Single-Output feedbacks. This phenomena gets even worse in presence of nearby converters. This paper extends the concept of admittance reshaping to Multi-Input-Multi-Output (MIMO) control. A full state-feedback is added to the current reference of the converter to increase the damping of the conventional multi-loop control. A systematic offline algorithm is delegated to design the feedback, and a scalar coefficient is employed to activate/deactivate online the reshaping feedback, making the proposed solution user-friendly. The proposed control is analyzed both in time-and frequencydomain and tested in parallel-operation with other converters, and shows higher damping capability than conventional solutions and good robustness with respect to grid impedance and operating point variations. Experimental tests under ac and dc disturbances are conducted both in lab setup and in Hardware-In-the-Loop.

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Power Dynamic Decoupling Control of Grid-Forming Converter in Stiff Grid

Cited by 53 publications

References 30 publications

Charging Infrastructure and Grid Integration for Electromobility

Charging Infrastructure and Grid Integration for Electromobility

Phaser-Based Transfer Function Analysis of Power Synchronization Control Instability for a Grid Forming Inverter in a Stiff Grid

State Feedback Reshaping Control of Voltage Source Converter

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