Dynamic study of virtual oscillator controlled inverter based distributed energy source

Hazra, Puspal; Hadidi, Ramtin; Makram, Elham B.

doi:10.1109/naps.2015.7335221

Cited by 13 publications

(4 citation statements)

References 15 publications

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“…To employ VOC in more efficient way and applying it in grid‐connected mode, [44] suggested a method in which VOC‐based controller is modified to define tertiary control to track the real and reactive power references by adding the corresponding loops. [105] expanded VOC applications in grid‐connected mode by introducing a method in which a decentralized adaptive battery energy storage system (BESS) with a primary control scheme is used. Moreover, [52], [106] used Proportional Integral (PI) controllers to regulate the output power by tuning the current feedback gain of VOC.…”

Section: Limitation Of Virtual Oscillator‐based Controllermentioning

confidence: 99%

Virtual oscillator‐based methods for grid‐forming inverter control: A review

Aghdam

Agamy

2022

IET Renewable Power Gen

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In inverter‐dominant power systems, grid‐forming (GFM) inverters regulate voltage and frequency. To construct GFM inverters, conventionally, various control methods based on synchronous machine emulation or droop characteristics have been employed. However, recently, inverters are regulated by Virtual Oscillator Control (VOC) to emulate the dynamics of a weakly nonlinear oscillators. In contrast to droop control, VOC is a time‐domain controller that enables interconnected inverters to stabilize arbitrary initial conditions to a synchronized sinusoidal limit cycle rapidly. The fast synchronization, accurate power sharing in grid‐connected and islanded modes, simple and robust implementation make it a promising candidate for inverter‐dominant power systems. Moreover, VOC removes the computational burden within machine emulation‐based methods and provides an approach to measure the frequency without employing phase‐locked loop (PLL). Hence, to leverage the advantages of this method and expand its application in power system control, this paper reviews different VOC implementations. Mainly, this paper focuses on the studies related to the fundamental theory of oscillators and design process. Additionally, there are discussions on the stability analysis of VOC‐based systems, harmonics and pre‐synchronization. Challenges on the compatibility with heterogeneous controllers, fault ride‐through and other limitations of VOC including non‐inertial response and coupled power control are investigated and solutions are outlined.

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Section: Limitation Of Virtual Oscillator‐based Controllermentioning

confidence: 99%

Virtual oscillator‐based methods for grid‐forming inverter control: A review

Aghdam

Agamy

2022

IET Renewable Power Gen

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“…To overcome this issue, some additional control loops are added to VOC. In [46] and [47], two PI controllers are adopted to regulate output power by controlling the output current. While in [48], a hierarchical control is introduced to VOC.…”

Section: Vocmentioning

confidence: 99%

Grid Forming Converters in Renewable Energy Sources Dominated Power Grid: Control Strategy, Stability, Application, and Challenges

Zhang

Xiang

Lin

et al. 2021

Journal of Modern Power Systems and Clean Energy

166

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The renewable energy sources (RESs) dominated power grid is an envisaged infrastructure of the future power system, where the commonly used grid following (GFL) control for grid-tied converters suffers from lacking grid support capability, low stability, etc. Recently, emerging grid forming (GFM) control methods have been proposed to improve the dynamic performance and stability of grid-tied converters. This paper reviews existing GFM control methods for the grid-tied converters and compares them in terms of control structure, grid support capability, fault current limiting, and stability. Considering the impact of fault current limiting strategies, a comprehensive transient stability analysis is provided. In addition, this paper explores the typical applications of GFM converters, such as AC microgrid and offshore wind farm high-voltage direct current (OWF-HVDC) integration systems. Finally, the challenges to the GFM converters in future applications are discussed.

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“…In order to achieve a seamless control of active and reactive power, an additional power loop was introduced into the VOC in order to track the reference power set-point [18]- [20]. In [21]- [22], a complex-valued parameter was introduced into the VOC to realize the independent control of active and reactive power. The dispatchable VOC methods (also named as dVOC) were recently reported in [23]- [25].…”

Section: Introductionmentioning

confidence: 99%

A New Virtual Oscillator Control Without Third-Harmonics Injection For DC/AC Inverter

Luo

Koutroulis

et al. 2021

IEEE Trans. Power Electron.

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Virtual Oscillator Control (VOC) is a type of nonlinear grid-forming controller for DC/AC inverters. Compared with the droop control method, the original VOC has a faster transient response in islanded mode. However, its output voltage always contains a third-order harmonic, resulting in a significant third-harmonic current, especially in the grid-connected mode. In order to eliminate this harmonic, a notch-type filter is typically employed, but it affects the synchronization speed of multiple DC/AC inverters connected in parallel in islanded mode. In this paper, by analyzing the nonlinear dynamical equations of the oscillator and simplifying its nonlinear current source, a novel VOC for three-phase DC/AC inverters is proposed, which can successfully eliminate the third-order harmonic in the output voltage of the oscillator. Further, compared with the traditional VOC with notch filter, the grid-synchronization response of the proposed VOC-based DC/AC inverters can be significantly improved. A 3 kW/3phase/120 V experimental prototype system designed on the DSPACE DS1202 platform has been developed to verify the feasibility of the proposed control strategy.

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Dynamic study of virtual oscillator controlled inverter based distributed energy source

Cited by 13 publications

References 15 publications

Virtual oscillator‐based methods for grid‐forming inverter control: A review

Virtual oscillator‐based methods for grid‐forming inverter control: A review

Grid Forming Converters in Renewable Energy Sources Dominated Power Grid: Control Strategy, Stability, Application, and Challenges

A New Virtual Oscillator Control Without Third-Harmonics Injection For DC/AC Inverter

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