Analysis of Resonance in Microgrids and Effects of System Frequency Stabilization Using a Virtual Synchronous Generator

Hirase, Yuko; Sugimoto, K.; Sakimoto, Kenichi; Ise, Toshifumi

doi:10.1109/jestpe.2016.2581818

Cited by 145 publications

(86 citation statements)

References 15 publications

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“…As the current power system is still dominated by the synchronous machines, it is desired to make the IBG compatible in current power systems. Under this background, the concept of the virtual synchronous generator (VSG) is proposed [18][19][20][21][22][23][24]. The VSG concept is to modify the highly programmable supplementary controllers of the VSC interfaces and mimic the external characteristics of the traditional SGs [18].…”

Section: Introductionmentioning

confidence: 99%

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Adaptive Performance Tuning for Voltage-Sourced Converters with Frequency Responses

2020

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Renewable generation brings both new energies and significant challenges to the evolving power system. To cope with the loss of inertia caused by inertialess power electronic interfaces (PEIs), the concept of the virtual synchronous generator (VSG) has been proposed. The PEIs under VSG control could mimic the external properties of the traditional synchronous generators. Therefore, the frequency stability of the entire system could be sustained against disturbances mainly caused by demand changes. Moreover, as the parameters in the emulation control processes are adjustable rather than fixed, the flexibility could be enhanced by proper tuning. This paper presents a parameter tuning method adaptive to the load deviations. First, the concept and implementation of the VSG algorithm performing an inertia response (IR) and primary frequency responses (PFR) are introduced. Then, the simplification of the transfer function of the dynamic system of the stand-alone VSG-PEI is completed according to the distributed poles and zeros. As a result, the performance indices during the IR and PFR stages are deduced by the inverse Laplace transformation. Then, the composite influences on the performances by different parameters (including the inertia constant, the speed droop, and the load deviations) are analyzed. Based on the composite influences and the time sequences, an adaptive parameter tuning method is presented. The feasibility of the proposed method is verified by simulation.

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Section: Introductionmentioning

confidence: 99%

“…The VSG concept is to modify the highly programmable supplementary controllers of the VSC interfaces and mimic the external characteristics of the traditional SGs [18]. By the VSG control, the emulation of IR and PFR can be implemented [18][19][20][21][22][23][24].…”

Section: Introductionmentioning

confidence: 99%

Adaptive Performance Tuning for Voltage-Sourced Converters with Frequency Responses

2020

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“…In the last years, thanks to the development of new devices and new technologies and the wide use of information and communications technology (ICT) in power systems, microgrids have become an effective solution for providing electricity at small scale using various distributed energy sources and energy storage systems. Microgrids are flexible systems that can be operated either in grid-connected or in islanded mode [1]. When operated in grid-connected mode, microgrids purchase electricity from the main grid to control voltage and power balance [2] or sell unused electricity to the main grid for maximizing the operational benefits [3].…”

Section: Introductionmentioning

confidence: 99%

Driven Primary Regulation for Minimum Power Losses Operation in Islanded Microgrids

et al. 2018

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The paper proposes an improved primary regulation method for inverter-interfaced generating units in islanded microgrids. The considered approach employs an off-line minimum losses optimal power flow (OPF) to devise the primary frequency regulation curve’s set-points while satisfying the power balance, frequency and current constraints. In this way, generators will reach an optimized operating point corresponding to a given and unique power flow distribution presenting the minimum power losses. The proposed approach can be particularly interesting for diesel-based islanded microgrids that face, constantly, the issue of reducing their dependency from fossil fuels and of enhancing their generation and distribution efficiency. The Glow-worm Swarm Optimization (GSO) algorithm is selected as a key heuristic tool for solving the optimization problem. The main program is carried out in Matlab environment. A case study with a parametric analysis is implemented and all results are assessed and compared with the conventional droop control method to show the effectiveness of the proposed method as well as the improved reliability of the system.

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“…The VSGs could provide better active and reactive power to the power grid to improve the stability of power grid [10,11]. In [12][13][14][15], different virtual synchronous generator control strategies have been proposed to improve the frequency, voltage, transient stability and damping characteristic of power system with renewable power generators. In [16,17], the control strategies are designed to control the PVs and wind power to emulate the behaviors of the synchronous generators with energy storage system.…”

Section: Introductionmentioning

confidence: 99%

PV-based virtual synchronous generator with variable inertia to enhance power system transient stability utilizing the energy storage system

Liu

Yang

Yao

et al. 2017

Prot Control Mod Power Syst

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The Photovoltaic (PV) plants are significantly different from the conventional synchronous generators in terms of physical and electrical characteristics, as it connects to the power grid through the voltage-source converters. High penetration PV in power system will bring several critical challenges to the safe operation of power grid including transient stability. To address this problem, the paper proposes a control strategy to help the PVs work like a synchronous generator with variable inertia by energy storage system (ESS). First, the overall control strategy of the PV-based virtual synchronous generator (PV-VSG) is illustrated. Then the control strategies for the variable inertia of the PV-VSG are designed to attenuate the transient energy of the power system after the fault. Simulation results of a simple power system show that the PV-VSG could utilize the energy preserved in the ESS to balance the transient energy variation of power grid after fault and improve the transient stability of the power system.

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Analysis of Resonance in Microgrids and Effects of System Frequency Stabilization Using a Virtual Synchronous Generator

Cited by 145 publications

References 15 publications

Adaptive Performance Tuning for Voltage-Sourced Converters with Frequency Responses

Adaptive Performance Tuning for Voltage-Sourced Converters with Frequency Responses

Driven Primary Regulation for Minimum Power Losses Operation in Islanded Microgrids

PV-based virtual synchronous generator with variable inertia to enhance power system transient stability utilizing the energy storage system

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