Optimal Damping Recovery Scheme for Droop-Controlled Inverter-Based Microgrids

Raman, Gurupraanesh; Peng, Jimmy Chih-Hsien; Zeineldin, H. H.

doi:10.1109/tsg.2020.2966244

Cited by 16 publications

(12 citation statements)

References 34 publications

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“…The main purpose of this control is to protect the device from unrealistically large currents. In addition, there have been stability studies for not only determining the stable region by adjusting the droop ratio of conventional P-f and Q-V droop controls [11]- [12] but also for calculating the damping ratio automatically to reduce the oscillations [13]. However, the proposed methods might not be feasible to implement in a single bus.…”

Section: B Literature Reviewmentioning

confidence: 99%

Scaled-Up Slack Generator Based on Parallel Inverters for a Reliable IFSA Microgrid

Lee

2021

IEEE Access

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It is expected that the penetration of renewable-energy-based generators will rapidly increase worldwide. These factors also lead to an increase in the portion of inverters in the power system. This paper proposes a method to scale up the slack generator size based on parallel inverters. All of the multiple parallel inverters except one share the measured power from the slack bus to the grid by a predetermined ratio based on their sizes. A single inverter that does not participate in power sharing is allocated to be in charge of clearing the small power gap caused by the control delay and the measurement error (i.e., the physical slack). As a result, the net size of the scaled-up slack generator is n times greater than that of the physical slack when n non-slack inverters are added to the physical slack inverter. The proposed method is validated based on a real island power system model in Korea using a power system computer-aided design/electromagnetic transient including DC (PSCAD/EMTDC TM ).INDEX TERMS DG acceptability, large IFSA microgrid, load sharing, parallel inverter connection, scaleup of slack generator.

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Section: B Literature Reviewmentioning

confidence: 99%

Scaled-Up Slack Generator Based on Parallel Inverters for a Reliable IFSA Microgrid

Lee

2021

IEEE Access

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“…The main purpose of this control is to protect the device from unrealistically large currents. In addition, there have been stability studies for not only determining the stable region by adjusting the droop ratio of conventional P-f and Q-V droop controls [5], [6] but also for calculating the damping ratio automatically to reduce the oscillations [7]. However, the proposed methods might not be feasible for application in a complicated real power system, and the droop coefficient must be reassessed and updated whenever the system configuration is changed.…”

Section: B Literature Reviewmentioning

confidence: 99%

“…12(b). For voltage regulation, the VMS control changes the real and reactive powers based on the sensitivity in (7), as shown in Figs. 12(f) and (j).…”

Section: B Load Changes With Constraint Of Real Power Generationmentioning

confidence: 99%

Power-Sensitivities-Based Indirect Voltage Control of Renewable Energy Generators With Power Constraints

2021

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Recently, renewable energy has received considerable attention worldwide due to environmental problems such as climate change. However, there are still many problems to be solved to increase the penetration level of renewable energy sources in a power system. Above all, a power system with a high renewable penetration level requires an entirely novel operational strategy and control approach to achieve reliable operation by considering the intermittency of variable renewable energy sources. This paper proposes power-sensitivities-based indirect voltage control of renewable energy generators with power constraints. The proposed method realizes seamless control of the voltage by compensating with the reactive power if the real power of the distributed generator (DG) is insufficient due to its intermittency. To achieve the proposed method, the real and reactive power references of DGs are initially operated based on the power sensitivities between generation and loads if all the DGs operate within the power constraints. However, if at least one of the DGs reaches its constraint limit, the references can be modified using other sensitivities between real and reactive power generation enabling indirect voltage control of DGs. Therefore, a high level of renewable penetration in power systems can be accomplished with the proposed method. The proposed method is verified with several case studies that are based on a microgrid with practical data from a real island power system. Verification is carried out using the power system computer aided design and electromagnetic transient including DC (PSCAD/EMTDC TM ) simulation software.INDEX TERMS Distributed generation, indirect voltage control, power sensitivity, renewable energy, variable renewable energy, voltage stability.

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“…Operators may not have a full analytical model available for the power system. If a model is available, the process involves the repeated computation of the eigenvalues of the system matrix for a wide range of control choices, making the process unscalable to large systems [9]. Secondly, time-domain simulations (based on numerical models of the system components) can be used to classify each point in the control parameter hyperspace.…”

Section: Introductionmentioning

confidence: 99%

“…However, for SRD, researchers have primarily relied on analytic models, which are computationally challenging and therefore unsuitable for online implementation. For instance, power systems with inertia-free generation tend to have lower time constants (∼100 ms), while SRD could take several seconds, depending on the size of the system [9].…”

Section: Introductionmentioning

confidence: 99%

Conditional Generative Adversarial Networks for Dynamic Control-Parameter Selection in Power Systems

Raman

O’Rourke

et al. 2022

IEEE Access

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This paper describes the novel application of conditional Generative Adversarial Networks (cGANs) for the real-time stability region determination (SRD) of power systems. As the network configuration changes during the course of operation, the availability of the stability region would enable the operator to suitably tune the control parameters to maintain stability while maximizing the dynamic performance. Here, the implementation of the cGANs-based SRD is described using transmission and microgrid case studies, where it is demonstrated to adaptively estimate the stability region for different network configurations with high accuracy. It is also shown that the cGANs approach has a significantly shorter execution time as compared to the conventional model-based method, demonstrating its value for real-time use in practical power systems.INDEX TERMS Control parameter tuning, distributed generation, Generative Adversarial Networks (GANs), model-free approach, real-time control, small-signal stability.

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Optimal Damping Recovery Scheme for Droop-Controlled Inverter-Based Microgrids

Cited by 16 publications

References 34 publications

Scaled-Up Slack Generator Based on Parallel Inverters for a Reliable IFSA Microgrid

Scaled-Up Slack Generator Based on Parallel Inverters for a Reliable IFSA Microgrid

Power-Sensitivities-Based Indirect Voltage Control of Renewable Energy Generators With Power Constraints

Conditional Generative Adversarial Networks for Dynamic Control-Parameter Selection in Power Systems

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