A Self-Regulated Virtual Impedance control of VSG in a microgrid

Rathore, B.; Chakrabarti, Saikat; Srivastava, Laxmi

doi:10.1016/j.epsr.2021.107289

Cited by 16 publications

(6 citation statements)

References 25 publications

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“…Building the larger-capacity FIS adopting grid-following control strategy may further reduce the power quality and reliability of distribution transformer areas [12,13]. Therefore, the grid-forming control strategy should be adopted for the power control converter in the FIS [14][15][16].…”

Section: Introductionmentioning

confidence: 99%

An Optimized Grid‐Forming Control Strategy for the Flexible Interconnection System in Distribution Transformer Areas

Yu,

Xu,

Yan

et al. 2024

IEEJ Transactions Elec Engng

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The flexible interconnection system (FIS) in distribution transformer areas can improve the local consumption capacity of high penetration rate distributed photovoltaics and solve the problem of the high loading rate of distribution transformers. This paper presents an optimized grid‐forming control strategy for the FIS in distribution transformer areas. First, the DC side impedance small signal model of the FIS is built, and the reason for the stability difference of the FIS is analyzed when the active power flows in different directions. An optimized control structure is then presented based on the conventional grid‐forming control strategy. The theoretical analysis shows that the optimized grid‐forming control strategy can improve the stability of the FIS. Finally, the controller hardware‐in‐the‐loop experiments based on RT‐LAB confirm the effectiveness of the presented optimized control strategy. © 2024 Institute of Electrical Engineer of Japan and Wiley Periodicals LLC.

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Section: Introductionmentioning

confidence: 99%

An Optimized Grid‐Forming Control Strategy for the Flexible Interconnection System in Distribution Transformer Areas

Yu,

Xu,

Yan

et al. 2024

IEEJ Transactions Elec Engng

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“…Considering the power decoupling, the virtual impedance was introduced to eliminate the coupling effect, which can suppress the low-frequency oscillation effectively [20]. In References [21,22], the virtual impedance was used to improve the transient stability in the microgrid. Reference [23] uses virtual impedance to change the output impedance of the HVDC system and improve the transmission capacity of the system.…”

Section: Introductionmentioning

confidence: 99%

Suppression Strategy of Subsynchronous Oscillation Based on Dynamic Voltage Compensation Control for Grid-Forming D-PMSG in Weak Grid

Chen,

Ren,

et al. 2023

International Journal of Energy Research

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The virtual impedance can suppress the low-frequency oscillation effectively caused by the power coupling effect for the grid-forming direct-drive permanent magnet synchronous generator (D-PMSG). However, there are few studies on the influence of virtual impedance on the subsynchronous oscillation caused by the interaction between the grid-forming D-PMSG and the weak grid. In this paper, the mechanism of virtual impedance improving the stability of virtual synchronous generator (VSG) control for the converter is revealed from the perspective of power coupling, and the influence of virtual impedance on the system stability in subsynchronous frequency range was analysed based on the sequence impedance model. The analysis results show that the virtual inductance cannot effectively improve the oscillation suppression effect, but the virtual resistance can greatly improve the damping characteristics of the system which has a good oscillation suppression effect. However, excessive increase in virtual resistance will cause power coupling oscillation, even subsynchronous oscillation, which shows limitations in subsynchronous oscillation suppression. To solve the problem, a dynamic voltage compensation control method based on active disturbance rejection control (ADRC) was proposed, and the parameters are designed by bandwidth method. The method can suppress the subsynchronous oscillation effectively in a certain frequency range under different grid strength and disturbance conditions. And it shows strong adaptability and good system robustness in weak grid. Finally, the effectiveness of the proposed oscillation suppression strategy was verified by time domain simulation.

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“…In [19], based on the adaptive inertia J and damping coefficient D, an adaptive droop coefficient was also considered, which not only improved the frequency performance of the power grid but also provided better SOC maintenance capabilities for energy storage. In [20], an adaptive virtual impedance control was proposed; this can improve damping and response frequency and suppress impulse current under overload and faults.…”

Section: Introductionmentioning

confidence: 99%

A Bidirectional Grid-Friendly Charger Design for Electric Vehicle Operated under Pulse-Current Heating and Variable-Current Charging

Jin,

Wang,

et al. 2023

Sustainability

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Low-temperature preheating, fast charging, and vehicle-to-grid (V2G) capabilities are important factors for the further development of electric vehicles (EVs). However, for conventional two-stage chargers, the EV charging/discharging instructions and grid instructions cannot be addressed simultaneously for specific requirements, pulse heating and variable-current charging can cause high-frequency power fluctuations at the grid side. Therefore, it is necessary to design a bidirectional grid-friendly charger for EVs operated under pulse-current heating and variable-current charging. The DC bus, which serves as the medium connecting the bidirectional DC–DC and bidirectional DC–AC, typically employs capacitors. This paper analyzes the reasons why the use of capacitors in the DC bus cannot satisfy the grid and EV requirements, and it proposes a new DC bus configuration that utilizes energy storage batteries instead of capacitors. Due to the voltage-source characteristics of the energy storage batteries, EV instructions and grid instructions can be flexibly and smoothly scheduled by using phase-shift control and adaptive virtual synchronous generator (VSG) control, respectively. In addition, the stability of the control strategy is demonstrated using small signal modeling. Finally, typical operating conditions (such as EV pulse preheating, fast charging with variable current, and grid peak shaving and valley filling) are selected for validation. The results show that in the proposed charger, the grid scheduling instructions and EV charging/discharging instructions do not interfere with each other, and different commands between EVs also do not interfere with each other under a charging pile with dual guns. Without affecting the requirements of EVs, the grid can change the proportion of energy supply based on actual scenarios and can also obtain energy from either EVs or energy storage batteries. For the novel charger, the pulse modulation time for EVs consistently achieves a steady state within 0.1 s; thus, the pulse modulation speed is as much as two times faster than that of conventional chargers with identical parameters.

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A Self-Regulated Virtual Impedance control of VSG in a microgrid

Cited by 16 publications

References 25 publications

An Optimized Grid‐Forming Control Strategy for the Flexible Interconnection System in Distribution Transformer Areas

An Optimized Grid‐Forming Control Strategy for the Flexible Interconnection System in Distribution Transformer Areas

Suppression Strategy of Subsynchronous Oscillation Based on Dynamic Voltage Compensation Control for Grid-Forming D-PMSG in Weak Grid

A Bidirectional Grid-Friendly Charger Design for Electric Vehicle Operated under Pulse-Current Heating and Variable-Current Charging

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