A Comparative Study of Two Widely Used Grid-Forming Droop Controls on Microgrid Small-Signal Stability

Du, Wei; Chen, Zhe; Schneider, Kevin P.; Lasseter, R.H.; Nandanoori, Sai Pushpak; Tuffner, Francis K.; Kundu, Soumya

doi:10.1109/jestpe.2019.2942491

Cited by 187 publications

(107 citation statements)

References 30 publications

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“…The PV inverters are modelled as three‐phase, controllable current sources, operating as grid‐following inverters. Because an entire simulation requires <10 s to study a transient in a microgrid, a constant, unity power factor injection is assumed at the inverters [32]. A typical grid‐following control strategy is implemented, with fast control of active power

()(, P)

and reactive power

()(, Q)

[33].…”

Section: Power System Modelmentioning

confidence: 99%

Studying impacts of communication system performance on dynamic stability of networked microgrid

et al. 2020

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()(, P)

and reactive power

()(, Q)

[33].…”

Section: Power System Modelmentioning

confidence: 99%

Studying impacts of communication system performance on dynamic stability of networked microgrid

et al. 2020

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“…Droop is a common technique that is used for several converter control applications, especially when power sharing between various VSCs is required in a similar fashion to that of SMs. A fully optimized droop implementation for VSC applications is still an active research question that attracts research to overcome performance limitations [3].…”

Section: A Droop Controlmentioning

confidence: 99%

“…The increased renewable energy sources (RES) and distributed energy resources (DER) penetration through voltage source converters (VSCs) has been contributing to a change in the classical network-operating paradigm that relied on synchronous machines (SMs) dominated grids [1][2][3]. VSCs gridconnection can be achieved in grid-following or grid-forming control modes.…”

Section: Introductionmentioning

confidence: 99%

Performance Evaluation of Four Grid-Forming Control Techniques with Soft Black-Start Capabilities

Alassi

Ahmed

Egea‐Àlvarez

et al. 2020

2020 9th International Conference on Renewable Energy Research and Application (ICRERA)

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Grid-Forming Converters (GFC) can be controlled as independent, self-starting, voltage sources. This feature is essential for power converters to achieve successful black-start sequence initiation. Conventional grid-following converters are not capable of self-starting an islanded network. GFC control thus exploits wider grid support and network restart potential. This study analyzes and compares four GFC controllers to assess their generic and soft black-start (ramping voltage) capabilities. The compared techniques are: Droop Control, Power Synchronizing Control (PSC), Virtual Synchronous Machine (VSM), and Matching control. These techniques are selected based on their direct voltage reference control flexibility. Various simulations are performed with common parameters to assess the response of each technique under similar conditions against load, DC voltage and active power reference disturbances, in addition to their soft-start readiness. The results demonstrate the high-level compatibility of these four controllers with soft black-start through successful and timely ramping voltage reference tracking. Moreover, the four considered control techniques achieve satisfactory performance, with VSM demonstrating more flexibility due to its tunable virtual inertia parameter (J).

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“…A complete small signal model of an islanding MG is presented, in which the dynamic analysis represents that by changing the power demand by the consumers, the low frequency modes of the power distribution system are displaced and can lead to instability [16]. To solve this problem, a simplified linear model of the system and based on it, a modified droop control strategy has been proposed to optimally achieve the power sharing while maintaining the stability [17]. Similarly, the use of inductive and virtual impedance loops is presented to improve the performance of the power sharing accuracy in MGs considering the variations in impedance of cables, however, this method is not applicable with complex MGs and it is hard to program the DG controllers [18].…”

Section: Introductionmentioning

confidence: 99%

Droop Method Development for Microgrids Control Considering Higher Order Sliding Mode Control Approach and Feeder Impedance Variation

et al. 2021

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Due to the growing power demands in microgrids (MGs), the necessity for parallel production achieved from distributed generations (DGs) to supply the load required by customers has been increased. Since the DGs have to procure the demand in parallel mode, they are faced with several technical and economic challenges, such as preventing DGs overloading and not losing network stability considering feeder impedance variation. This paper presents a method that upgrades the droop controller based on sliding mode approach, so that DGs are able to prepare a suitable reactive power sharing without error even in more complex MGs. In the proposed strategy, the third-order sliding mode controller significantly reduces the V-Q error and increases the accuracy in adjusting the voltage at the DG output terminals. Various case studies conducted out in this paper validate the truthfulness of the proposed method, considering the stability analysis using Lyapunov function. Finally, by comparing the control parameters of the proposed technique with existing methods, the superiority, simplicity and effectiveness of the 3rd order sliding mode control (SMC) method are determined.

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A Comparative Study of Two Widely Used Grid-Forming Droop Controls on Microgrid Small-Signal Stability

Cited by 187 publications

References 30 publications

Studying impacts of communication system performance on dynamic stability of networked microgrid

Studying impacts of communication system performance on dynamic stability of networked microgrid

Performance Evaluation of Four Grid-Forming Control Techniques with Soft Black-Start Capabilities

Droop Method Development for Microgrids Control Considering Higher Order Sliding Mode Control Approach and Feeder Impedance Variation

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