Unified Voltage Control for Grid-Forming Inverters

Liu, Teng; Wang, Xiongfei

doi:10.1109/tie.2023.3265055

Cited by 10 publications

(9 citation statements)

References 24 publications

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“…As for the closed-loop VVC in Fig. 1(b), it is proved in [16], [48], [45] that the inner VCC acts as a virtual resistance, which provides additional damping to the SR. Hence, there is a low risk of SR when the VCC is adopted.…”

Section: ) Closed-loop Vvcmentioning

confidence: 97%

“…Fig. 2 shows the block diagram of the classic VVC and VCC [44], [34], [45] using the complex-vector representation [46]. A fast VVC can help to reject disturbances, e.g., mitigating voltage harmonics across a broader frequency range [7], [4].…”

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

confidence: 99%

“…Note that the VVC and VCC affect the output impedance of the VSC [48], [45], and introduce more dynamic couplings with the outer loop control. Such couplings can be detrimental to the system stability, as will be discussed in the following.…”

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

confidence: 99%

“…The inner loops are used to regulate fast dynamics of voltage and current and shape the impedance [45], [25]. Typically, the inner loops cover the bandwidth of the outer loops, therefore influencing the dynamics of outer loops as well.…”

Section: ) Closed-loop Vvcmentioning

confidence: 99%

“…VCC can also contribute to the damping [45]. Therefore, it is important to consider the inner loops when analyzing the lowfrequency dynamics of outer loops.…”

Section: A Inner Loop Controller Designmentioning

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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Section: ) Closed-loop Vvcmentioning

confidence: 97%

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

confidence: 99%

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

confidence: 99%

Section: ) Closed-loop Vvcmentioning

confidence: 99%

“…VCC can also contribute to the damping [45]. Therefore, it is important to consider the inner loops when analyzing the lowfrequency dynamics of outer loops.…”

Section: A Inner Loop Controller Designmentioning

confidence: 99%

See 3 more Smart Citations