Control of Grid-Forming VSCs: A Perspective of Adaptive Fast/Slow Internal Voltage Source

Wu, Heng; Wang, Xiongfei

doi:10.1109/tpel.2023.3268374

Cited by 33 publications

(3 citation statements)

References 36 publications

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“…1(a). Examples of GFM controls using open-loop VVC structure can be found in [15], [24], [42], [43].…”

Section: T II General Control Structures and Low-frequency Resonance ...mentioning

confidence: 99%

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Robust Synchronization Control for Grid-Forming Converters with Regulated DC-Link Dynamics

Zhao¹,

Jin²,

Wang³

2022

Preprint

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<p>For grid-forming (GFM) converters, the dc-link voltage control (DVC) can directly generate the frequency that is used for the grid synchronization. However, this method suffers from low-frequency oscillations (LFO). To tackle this challenge, this paper proposes a robust synchronization control for GFM converters. In the approach, the DVC and the <em>q</em>-axis voltage feedforward control loops are connected in parallel for the synchronization purpose. Compared with the conventional single-loop DVC scheme, the proposed synchronization approach can dampen the LFO. Compared with conventional cascaded or paralleled DVC and active power control schemes, the proposed synchronization approach can avoid the trade-off between LFO and synchronous resonance issues. Experimental tests of GFM converters are performed in rectifier and inverter modes. The results confirm the effectiveness of theoretical analysis and the performance of the proposed control approach. </p>

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“…1(a). Examples of GFM controls using open-loop VVC structure can be found in [15], [24], [42], [43].…”

Section: T II General Control Structures and Low-frequency Resonance ...mentioning

confidence: 99%

“…The method enhances the system stability and preserves the droop and inertial characteristics. It can balance the damping for both SR and SSR [59], and offer the required inertial power as per the grid code requirement [55], [43]. Yet, the design of lead-lag compensator coefficients is dependent on the grid impedance [60].…”

Section: ) Use Of Lpfmentioning

confidence: 99%

Robust Synchronization Control for Grid-Forming Converters with Regulated DC-Link Dynamics

Zhao¹,

Jin²,

Wang³

2022

Preprint

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show abstract

“…In order to make GFM inverters keep a stronger voltage source characteristic, the reactive power tracking speed is usually designed to be slow [19]. Otherwise, the stability of GFM inverters might be jeopardized.…”

Section: Introductionmentioning

confidence: 99%

Mixed Grid-Forming and Grid-Following Inverters with Secondary Control Providing Fast Voltage and Frequency Support

Huang,

Wu,

Zhou

et al. 2023

2023 25th European Conference on Power Electronics and Applications (EPE'23 ECCE Europe)

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As the penetration of renewable energy generation increases, grid-forming (GFM) inverters are deemed to be a promising solution for future power systems. However, restricted by the power rating of the inverter, the limited power output ability makes GFM inverters behave not exactly the same as synchronous generators. Namely, GFM inverters may have difficulties in meeting all the Grid Codes simultaneously. When the active power requirement is prioritized to be satisfied by GFM inverters, the reactive power requirement may be difficult to meet at the same time. To address this issue, a mixed GFM and grid-following inverter scheme is proposed, where the GFM inverter is prioritized to provide active power to support the grid frequency while the GFL inverter is prioritized to provide reactive power to support the grid voltage. It is found that the proposed mixed scheme can provide fast voltage and frequency support in weak grid case.

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Harmonics Coupling Stability Analysis of Grid-Forming Wind Farms Interconnected with MMC-HVDC

Zheng,

Jiao,

2024

Lecture Notes in Electrical Engineering

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Control of Grid-Forming VSCs: A Perspective of Adaptive Fast/Slow Internal Voltage Source

Cited by 33 publications

References 36 publications

Robust Synchronization Control for Grid-Forming Converters with Regulated DC-Link Dynamics

Robust Synchronization Control for Grid-Forming Converters with Regulated DC-Link Dynamics

Mixed Grid-Forming and Grid-Following Inverters with Secondary Control Providing Fast Voltage and Frequency Support

Harmonics Coupling Stability Analysis of Grid-Forming Wind Farms Interconnected with MMC-HVDC

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