Stability prediction and stability enhancement for large-scale PV Power plants

Ackermann, Florian; Bihler, Nicolas; Rogalla, Soenke

doi:10.1109/pedg.2016.7527017

Cited by 10 publications

(6 citation statements)

References 2 publications

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“…I24 -Germany2015C Germany, around 2015 [79], [80]. During low-voltage ride through (LVRT) testing of largescale PV systems, the change in grid impedance caused stability problems with standard tuning of the inverter control systems (PG).…”

Section: Complexity and Sensitivity Of Oscillatory Incidentsmentioning

confidence: 99%

“…During low-voltage ride through (LVRT) testing of largescale PV systems, the change in grid impedance caused stability problems with standard tuning of the inverter control systems (PG). The many paralleled inverters in largescale PV power plants must be considered and studied in detail [80] to understand these interactions. In addition, the transition from traditional current-controlled sources to adaptive control or voltage source control is recommended [80].…”

Section: Complexity and Sensitivity Of Oscillatory Incidentsmentioning

confidence: 99%

“…The many paralleled inverters in largescale PV power plants must be considered and studied in detail [80] to understand these interactions. In addition, the transition from traditional current-controlled sources to adaptive control or voltage source control is recommended [80]. Besides power quality issues no further fallout was reported.…”

Section: Complexity and Sensitivity Of Oscillatory Incidentsmentioning

confidence: 99%

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Survey of Real-World Grid Incidents–Opportunities, Arising Challenges and Lessons Learned for the Future Converter Dominated Power System

Wachter,

Gröll,

Hagenmeyer

2024

IEEE Open J. Power Electron.

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To reach the climate goals set by national and international institutions, a vast transition of the legacy power system is unavoidable. The necessary integration of distributed, renewable generation devices, which are often interfaced with power electronic converters, has a non-negligible influence on the characteristics of the power grid. This is particularly visible during abnormal grid conditions such as faults. For rotating machines, the fast-timescale reaction to these events is mainly determined by physical properties. However, power electronic devices lack this strong coupling and their behavior is generated by the control and automation system, making them a major field of interest during this transition. The present paper provides a survey of real-world incidents, as for example blackouts or oscillatory incidents, that are discussed with respect to the implications for future converter dominated power grids. For typical cascading outages it is shown, where the increasing penetration of distributed, renewable generation and smart grid technologies can be leveraged to increase the system resilience, e.g. by providing grid services through adequate control design or by enabling microgrid concepts. Further, real-world examples of newly emerging challenges driven by power electronic devices are presented. The mechanisms of control system interactions with the neighboring grid and its inherent complex dependency on various factors is illustrated. Lastly, resulting structural developments such as the changed resonance properties of low voltage grids and the increase of harmonic emissions are exemplified.

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Section: Complexity and Sensitivity Of Oscillatory Incidentsmentioning

confidence: 99%

Section: Complexity and Sensitivity Of Oscillatory Incidentsmentioning

confidence: 99%

Section: Complexity and Sensitivity Of Oscillatory Incidentsmentioning

confidence: 99%

See 1 more Smart Citation

Survey of Real-World Grid Incidents–Opportunities, Arising Challenges and Lessons Learned for the Future Converter Dominated Power System

Wachter,

Gröll,

Hagenmeyer

2024

IEEE Open J. Power Electron.

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“…However, this method still is the basis to predict the harmonic emission at the PCC). In this paper, consideration of grid equivalent impedance introduced in [10] and [11] is proposed for measurements in order to investigate the harmonic behavior of inverters and eventually improving the results of the summation law. Lab measurements are performed to validate the proposed theory.…”

Section: Introductionmentioning

confidence: 99%

Improving the Summation Law for Harmonic Current Emissions of Parallel Operated PV Inverters by Considering Equivalent Grid Impedance

Moghadam¹,

Ackermann²,

Rogalla³

2024

RE&PQJ

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For connection of a PV park to the electricity network, a pre-compliance study has to prove that the harmonic emissions at the point of common coupling (PCC) stays below the limits specified by the standards or local or national grid codes. An equation defined in IEC 61400-21 [1] is used to estimate the total harmonic current emission of the park at the PCC prior to installation. The equation uses the harmonic emission of a single inverter to predict the spectrum of the total current for a given number of identical inverters connected in parallel at the PCC. This paper considers the interaction of parallel operated inverters and the grid impedance. It proposes an approach based on the so called "equivalent grid impedance", to improve the performance of summation law for evaluation of the current harmonics emissions at the PCC of PV parks. Improvement of this method would be helpful for power plant constructors.

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“…Meanwhile, the power grid requires the PV system with high-power quality and stability performance in order to provide satisfactory service for consumers. However, voltage source converters (VSCs) paralleled together in PV stations affect the system stability greatly [2][3][4][5]. The non-linear factors in the large PV system can cause more problems and are worth to be analysed.…”

Section: Introductionmentioning

confidence: 99%

Power quality and stability analysis of large‐scale grid‐connected photovoltaic system considering non‐linear effects

Zhang

Zhou

Mao

et al. 2018

IET Power Electronics

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This study proposes to incorporate the non-linear factors, such as dead time and phase-locked loop (PLL), into the impedance model of large-scale grid-connected photovoltaic (PV) system and investigates their influence on the system power quality and stability considering the variation of PV capacity. The fundamental component of dead-time voltage can influence the inverter output impedance. The harmonics also have a vital effect on system power quality, especially when the inverter output admittance matches with the grid admittance. The increase of PV capacity can lower the influence of dead time on system phase margin, but may cause serious magnification of certain dead-time harmonics. PLL can make the system asymmetric and brings about the frequency coupling effect. The complex vectors and the transfer function matrix are used to convert the model of PLL from dq-to αβ-axis. The generalised Nyquist stability criterion is utilised to analyse the system stability. The variations of controller parameters in PLL can make the system oscillate. The increase of PV capacity may intensify this effect. Even the stable controller parameters are adopted, large PV capacity can trigger the system oscillation. Finally, the correctness of the theory is verified by simulation analysis and experiment.

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Stability prediction and stability enhancement for large-scale PV Power plants

Cited by 10 publications

References 2 publications

Survey of Real-World Grid Incidents–Opportunities, Arising Challenges and Lessons Learned for the Future Converter Dominated Power System

Survey of Real-World Grid Incidents–Opportunities, Arising Challenges and Lessons Learned for the Future Converter Dominated Power System

Improving the Summation Law for Harmonic Current Emissions of Parallel Operated PV Inverters by Considering Equivalent Grid Impedance

Power quality and stability analysis of large‐scale grid‐connected photovoltaic system considering non‐linear effects

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