Mitigating Stability Issues Due to Line Dynamics in Droop-Controlled Multi-Inverter Systems

Raman, Gurupraanesh; Peng, Jimmy Chih-Hsien

doi:10.1109/tpwrs.2019.2949311

Cited by 37 publications

(19 citation statements)

References 29 publications

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“…have been very well reported in literature [3]- [5]. Previous studies show that microgrids suffer from poorly damped low frequency oscillations mainly affected by droop controller and network dynamics [6]. However, voltage and current controller as well as filter parameters are responsible for medium and high frequency oscillations which have significant damping.…”

Section: Nomenclaturementioning

confidence: 61%

Design and Expansion Planning of Parallel Inverter Based AC Microgrids - An Approach for Improved Stability Margins

Firdaus¹,

Molinas²

2020

Preprint

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<div>This paper presents an application of impedancebased modelling approach to identify suitable locations for design<br></div>and expansion planning of an inverter based autonomous AC microgrid. The objective is to find out ideal location for placement of additional components which can include new inverter-based sources, microgrid damping controller, etc., ensuring sufficient stability margins. These objectives are achieved by first identifying the weakest and the strongest nodes in the system with respect to the system stability and then observing the effects of choosing various nodes for design and expansion on overall system stability. The weakest and the strongest nodes are identified<br>using the impedance based stability analysis of the microgrid by dividing the system in various possible partition points while the impact of choosing different locations on stability is analyzed by eigen value analysis as well as time-domain MATLAB/Simulink simulations and experimental results. <div> <br><b>This paper has been submitted to JESTPE on 25-04-2020 and rejected on 29-08-2020.</b></div>

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Section: Nomenclaturementioning

confidence: 61%

Design and Expansion Planning of Parallel Inverter Based AC Microgrids - An Approach for Improved Stability Margins

Firdaus¹,

Molinas²

2020

Preprint

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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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“…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%

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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Mitigating Stability Issues Due to Line Dynamics in Droop-Controlled Multi-Inverter Systems

Cited by 37 publications

References 29 publications

Design and Expansion Planning of Parallel Inverter Based AC Microgrids - An Approach for Improved Stability Margins

Design and Expansion Planning of Parallel Inverter Based AC Microgrids - An Approach for Improved Stability Margins

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

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