Self-Synchronized Synchronverters: Inverters Without a Dedicated Synchronization Unit

Zhong, Qing-Chang; Nguyen, Phuong H.; Ma, Zengwei; Sheng, Wanxing

doi:10.1109/tpel.2013.2258684

Cited by 825 publications

(126 citation statements)

References 26 publications

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“…Moreover, GSC has little influence on SSR stability, therefore the analysis of GSC will be neglected in the following [19,23,24]. (5) where Isdq and Irdq are the stator and rotor current respectively, Usdq and Urdq are the stator and rotor voltage respectively, ψsdq, ψrdq and ψmdq are the stator, rotor and air-gap flux respectively, Lm, Ls and Lr are the mutual, stator and rotor inductance, in which Ls = Lm + Lsσ, Lr = Lm + Lrσ, Lsσ and Lrσ are the stator and rotor self-inductance respectively, ω is the SRF angular frequency, ωs is the slip angular frequency, ωs = ω − ωr, ωr is the rotor angular frequency. All variables are referenced to the stator.…”

Section: Vsg Control For Dfigmentioning

confidence: 99%

“…It is necessary to enhance the ability of WPGS to support power systems like conventional SGs. Based on this consideration, the virtual synchronous generator (VSG) control is proposed [4,5].…”

Section: Introductionmentioning

confidence: 99%

“…VSG is first introduced to stabilize the grid frequency by adding virtual rotational inertia to distributed generation systems in [4]. The concepts of "Self-Synchronized Synchronverters" is proposed in [5], in which phase-locked loop can be neglected. The method to stabilize the power system based on VSG control with alternating moment of inertia is introduced in [6].…”

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Analysis and Mitigation of Sub-Synchronous Resonance for Doubly Fed Induction Generator under VSG Control

Jiao

Li²,

Ding³

et al. 2020

Energies

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This paper presents the analysis and mitigation of sub-synchronous resonance (SSR) for doubly fed induction generators (DFIG) under virtual synchronous generator (VSG) control, based on impedance methods. VSGs are considered to have grid-supporting ability and good stability in inductance-based weak grids, and are implemented in renewable power generations, including DFIG systems. However, stability analyses of VSGs for DFIG connecting with series capacitor compensation are absent. Therefore, this paper focuses on the analysis and mitigation of SSR for DFIG under VSG control. Impedance modeling of DFIG systems is used to analyze SSR stability. Based on impedance analysis, the influence of VSG control parameters and the configuration of damping factor of reactive power are discussed. Next, a parameter configuration method to mitigate SSR is proposed. Finally, time-domain simulation and fast fourier transform (FFT) results are given to validate the correctness and effectiveness of the impedance model and parameter configuration methods.

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Section: Vsg Control For Dfigmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Analysis and Mitigation of Sub-Synchronous Resonance for Doubly Fed Induction Generator under VSG Control

Jiao

Li²,

Ding³

et al. 2020

Energies

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show abstract

“…These regulators are designed to emulate the behavior of classical synchronous generators with power converters associated to DG, ESSs, and loads connected to microgrids. In the literature, these techniques have been widely employed for diferent applications and are also known as virtual synchronous machines (VSMs) or synchronverters [8][9][10][11][12][13][14][15]. Following the main ac grid coniguration-where synchronous generators are directly connected-most of these techniques are usually employed for devices connected to ac microgrids.…”

Section: Lower-level Control Operation Modesmentioning

confidence: 99%

Hybrid AC/DC Microgrid Mode-Adaptive Controls

Unamuno¹,

Barrena²

2017

Development and Integration of Microgrids

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The lack of inertial response at microgrids is usually compensated by coniguring primary controllers of converter-interfaced devices to contribute in the transient response under power disturbances. The main purpose of this chapter is to study the modes of operation of primary level techniques of generation, storage, loads, and other devices atached to hybrid ac/dc microgrids. Although the chapter includes an analysis of the modes of operation of lower-level regulators, the focus is on upper-level or primary controllers.In this context, we analyze mode-adaptive controls based on voltage and frequency levels and we evaluate their behavior by simulation in the Matlab/Simulink ® environment. The results demonstrate that mode-adaptive techniques are adequate for maximizing the energy extracted by distributed generation (DG) systems and limit demand side management actuations while ensuring an adequate regulation of the microgrid.

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“…In this control method, the phase and magnitude of the load voltage were matched to the grid voltage, and there was no distortion of the load voltage and current when transferring from islanded mode to grid-connected mode. As the PLL measurement accuracy is often dependent on a parameter design, a synchronization method based on virtual impedance was proposed in [13]. This method did not require a PLL.…”

Section: Introductionmentioning

confidence: 99%

Adaptive Command-Filtered Backstepping Control for Virtual Synchronous Generators

Cui

Yang

et al. 2019

Energies

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Distributed energy sources are usually interfaced to the grid using power electronic converters, and lack of inertia in inverter dominated microgrids can affect the system stability. This paper presents a new method for virtual synchronous generator (VSG) control in order to solve the low system inertia and support the grid frequency problem. In this paper, the VSG based on electromagnetic transient characteristics is improved and an adaptive command filter back-stepping controller is designed. Firstly, the rotor swing equation and power part are modeled to complete the controller design for achieving system stability in the islanded, grid-connected and transition modes. In addition, a limited-amplitude command filter is used to deal with computational complexity and nonlinear saturation problems in the design process. Secondly, projection operator, and adaptive inertia and damping control are introduced to reduce the modeling error and disturbance caused by changing parameters. This ensures the boundedness of the estimated value and further improves the frequency response, especially in the transition mode. Finally, simulation results show that the proposed controller is more effective than the traditional control method for achieving power stability and frequency improvement.

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Self-Synchronized Synchronverters: Inverters Without a Dedicated Synchronization Unit

Cited by 825 publications

References 26 publications

Analysis and Mitigation of Sub-Synchronous Resonance for Doubly Fed Induction Generator under VSG Control

Analysis and Mitigation of Sub-Synchronous Resonance for Doubly Fed Induction Generator under VSG Control

Hybrid AC/DC Microgrid Mode-Adaptive Controls

Adaptive Command-Filtered Backstepping Control for Virtual Synchronous Generators

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