Improving transient stability of photovoltaic-hydro microgrids using virtual synchronous machines

Tamrakar, Ujjwol; Galipeau, David; Tonkoski, Reinaldo; Tamrakar, Indraman

doi:10.1109/ptc.2015.7232663

Cited by 49 publications

(27 citation statements)

References 9 publications

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“…Virtual inertia is a combination of control algorithms, RESs, ESSs, and power electronics that emulates the inertia of a conventional power system [13]. The concept of virtual inertia is summarized in Figure 5.…”

Section: Concept and Classification Of Virtual Inertia Topologiesmentioning

confidence: 99%

“…The current controller based on the grid current feedback generates the gate signals to drive the inverter. Thus, the inverter behaves as a current-controlled voltage source inverter [13,48]. This topology is used by the European VSYNC research group [45,50] and has demonstrated the effectiveness of inertia emulation using VSG topology through real-time simulations [51] and several field tests [52].…”

Section: Virtual Synchronous Generators: a Frequency-power Response Bmentioning

confidence: 99%

“…It is clear from the figure that in systems with lower inertia, the frequency nadir is considerably lower along with a high ROCOF. Such situations can lead to tripping of frequency relays (causing under-frequency load shedding (UFLS)) and, in the worst case, may lead to cascaded outages [12,13]. The solution to such scenarios is to add virtual inertia in the system.…”

Section: Introductionmentioning

confidence: 99%

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Virtual Inertia: Current Trends and Future Directions

et al. 2017

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Abstract:The modern power system is progressing from a synchronous machine-based system towards an inverter-dominated system, with large-scale penetration of renewable energy sources (RESs) like wind and photovoltaics. RES units today represent a major share of the generation, and the traditional approach of integrating them as grid following units can lead to frequency instability. Many researchers have pointed towards using inverters with virtual inertia control algorithms so that they appear as synchronous generators to the grid, maintaining and enhancing system stability. This paper presents a literature review of the current state-of-the-art of virtual inertia implementation techniques, and explores potential research directions and challenges. The major virtual inertia topologies are compared and classified. Through literature review and simulations of some selected topologies it has been shown that similar inertial response can be achieved by relating the parameters of these topologies through time constants and inertia constants, although the exact frequency dynamics may vary slightly. The suitability of a topology depends on system control architecture and desired level of detail in replication of the dynamics of synchronous generators. A discussion on the challenges and research directions points out several research needs, especially for systems level integration of virtual inertia systems.

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Section: Concept and Classification Of Virtual Inertia Topologiesmentioning

confidence: 99%

Section: Virtual Synchronous Generators: a Frequency-power Response Bmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Virtual Inertia: Current Trends and Future Directions

et al. 2017

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“…Virtual inertia emulation through appropriate control of power electronic converters has been widely proposed as a possible solution to counteract these issues. Virtual inertia is a combination of control algorithms, energy storage systems (ESS), and power electronics that emulates the inertia of a conventional power system [4]. Inertia can be emulated through use of ESS or by operating the RES units below their maximum power points, providing a reserve for the inertial response [5].…”

Section: Introductionmentioning

confidence: 99%

Comparative Analysis of Current Control Techniques to Support Virtual Inertia Applications

Tamrakar

Shrestha

Malla³

et al. 2018

Applied Sciences

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The rapid transition towards an inverter-dominated power system has reduced the inertial response capability of modern power systems. As a solution, inverters are equipped with control strategies, which can emulate inertia by exchanging power with the grid based on frequency changes. This paper discusses the various current control techniques for application in these systems, known as virtual inertia systems. Some classic control techniques like the proportional-integral, the proportional-resonant, and the hysteresis control are presented first, followed by the design and discussion of two more advanced control techniques based on model prediction and machine learning, respectively. MATLAB/Simulink-based simulations are performed, and results are presented to compare these control techniques in terms of harmonic performance, switching frequency, and transient response.

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“…Thus, the provision of synthetic inertia is studied in [25], and this concept is extended to the emulation of a synchronous machine, which leads to the so-called virtual synchronous generators [26]. The effect of these types of controllers has been normally analysed only in small test systems, considering one converter connected to the main grid or a small microgrid [27][28][29][30][31][32]. However, their impact on bulk power systems, which may be subject to phenomena and interactions that are not present in smaller systems, has not been addressed in detail.…”

Section: Introductionmentioning

confidence: 99%

Impact of 100‐MW‐scale PV plants with synchronous power controllers on power system stability in northern Chile

Remon

Cañizares

Rodríguez

2017

IET Generation, Transmission & Distribution

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The impact that renewable energy sources interfaced by power electronics have on power systems becomes more important as their share in the generation mix increases, thus requiring detailed analyses that take into account their dynamics and controllers. In this paper, the impact of photovoltaic (PV) power plants on the power system of northern Chile is analysed. The studied plants employ a controller that allows power converters to interact with the grid like virtual synchronous generators, and their model includes the dynamics of the plant and converter controllers, as well as the dc and PV system. The presented analysis, which comprises modal analysis and time-domain simulations of large disturbances, evaluates the impact of these plants with respect to PV plants based on a conventional converter controller. Tests and validations of the proposed models and controllers are carried out for an actual PV plant connected to the power system of northern Chile, and for a higher PV penetration case. The results show the ability of PV plants formed by virtually synchronous power converters to limit frequency excursions induced by large power imbalances, and to mitigate power oscillations of the synchronous machines in the system.

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Improving transient stability of photovoltaic-hydro microgrids using virtual synchronous machines

Cited by 49 publications

References 9 publications

Virtual Inertia: Current Trends and Future Directions

Virtual Inertia: Current Trends and Future Directions

Comparative Analysis of Current Control Techniques to Support Virtual Inertia Applications

Impact of 100‐MW‐scale PV plants with synchronous power controllers on power system stability in northern Chile

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