Effects of Increasing Power Electronics on System Stability: Results from MIGRATE Questionnaire

Sewdien, Vinay; Meijden, Mart A. M. M. van der; Breithaupt, Timo; Hofmann, Lutz; Herwig, Daniel; Mertens, Axel; Tuinema, Bart W.; Rueda, José L.

doi:10.23919/icue-gesd.2018.8635602

Cited by 12 publications

(3 citation statements)

References 3 publications

(2 reference statements)

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“…Frequency stability studies are traditionally conducted using RMS simulations, which are capable of simulating much longer events and much larger grid areas compared to EMT simulations [14,[18][19][20]. The RMS wind turbine (WT) models used in frequency stability studies, which are designed based on fundamental machine and converter equations and are also known as quasi-stationary models in the literature, require smaller simulation time steps compared to the conventional active devices (i.e., synchronous generators and dynamic loads) due to comparatively smaller time constants of the converter controllers [6,10].…”

Section: Introductionmentioning

confidence: 99%

Effiziente Modellierung von Windenergieanlagen mit doppelt gespeister Asynchronmaschine und Vollumrichter für Untersuchungen der Frequenzstabilität

Goudarzi

Reus

Hofmann

2023

Elektrotech. Inftech.

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The contribution of wind turbines (WTs) to enhance the frequency stability of power systems is traditionally analyzed using commonly applied root mean square (RMS) models. RMS WT models require smaller simulation time steps compared to conventional active devices (i.e., synchronous generators and dynamic loads) due to the comparatively smaller time constants of the converter controllers. Such small time steps become relevant in simulations of large-scale power systems with a high level of WT penetration and lead to high computational time and effort. This paper presents simplified simulation models of a doubly-fed induction generator-based WT and a full-scale converter-based WT, which enable higher simulation time steps due to the negligence of very small time constants with no relevant effects in the time frame of interest of frequency stability analysis. The models are derived from detailed RMS WT models based on fundamental machine and converter equations. In order to verify the validity of the underlying simplifications, the simplified models are compared to the detailed RMS models with a focus on their general behavior in case of step responses and their frequency responses in the event of a frequency drop in a 220 kV test system. For this purpose, both the detailed RMS WT models as well as the simplified WT models are extended with a droop-based fast frequency response controller and implemented in a MATLAB-based RMS simulation tool. The results of the case studies show feasible and comparable general behavior of the WT models as well as plausible frequency responses.

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Section: Introductionmentioning

confidence: 99%

Effiziente Modellierung von Windenergieanlagen mit doppelt gespeister Asynchronmaschine und Vollumrichter für Untersuchungen der Frequenzstabilität

Goudarzi

Reus

Hofmann

2023

Elektrotech. Inftech.

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“…The slow-interaction converter-driven stability refers to the stability issues driven by the slow dynamic interactions between the slow outer control loops of converters and other slow-response components in power systems, typically around system fundamental frequency; while the fast-interaction converter-driven stability (also referred to as harmonic stability [26]) involves the problems caused by fast dynamic interactions between the fast inner control loop of converters and other fast-response components in power systems, typically in the range of hundreds of hertz to several kilohertz. The converter-driven instability may arise due to many different reasons, such as converter-interfaced generation (CIG) controls, grid strength, converter-interfaced loads (CIL), operating conditions, power transfer limits, and other similar factors [27,28]. For example, the fast control dynamics of the CIGs may result in rapid frequency changes or transiently distorted voltage/current waveforms, which may lead to the over-reaction of protections fitted to the inverters and cause system tripping [29].…”

Section: Introductionmentioning

confidence: 99%

Review of Small-Signal Converter-Driven Stability Issues in Power Systems

Kong

Xue

Qiao

et al. 2022

IEEE Open J. Power Energy

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New grid devices based on power electronics technologies are increasingly emerging and introduce two new types of stability issues into power systems, which are different from traditional power system stability phenomena and not well understood from a system perspective. This paper intends to provide the state of the art on this topic with a thorough and detailed review of the converter-driven stability issues in partial or all power electronics-based grids. The underlying and fundamental mechanisms of the converter-driven stability issues are uncovered through different types of root causes, including converter controls, grid strength, loads, and converter operating points. Furthermore, a six-inverter two-area meshed system is constructed as a representative test case to demonstrate these unstable phenomena. Finally, the challenges to cope with the converter-driven stability issues in future power electronics-based grids are identified to elucidate new research trends.

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“…Increasing power electronics interfaced generation (PEIG) is expected to affect the stability of the power system in various ways [1]. In a survey, conducted by CIGRE, among system operators it was found that limited technical studies were performed to assess the fundamentally changing behaviour of the power system [2].…”

Section: Introductionmentioning

confidence: 99%

Evaluation of PV and QV based Voltage Stability Analyses in Converter Dominated Power Systems

Sewdien

Preece

Rueda

et al. 2018

2018 IEEE PES Asia-Pacific Power and Energy Engineering Conference (APPEEC)

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PV and QV analyses have been widely used in industry. It has already been proven that these steady state methods can be used to assess power system's load ability from voltage stability perspective and that their use in terms of accuracy is justified when compared to time domain simulations. However, this prior validation was carried out for conventional synchronous generator dominated power systems. With increasing levels of power electronics interfaced generation (PEIG) being integrated in power systems, the accuracy of the PV and QV methods for these 'green' power systems can be challenged. This paper investigates to what extend the use of these methods is justified when the power system faces a displacement of conventional generation with PEIG. To this end, assessments with the IEEE 9 bus system and full converter wind turbine generators have been performed in this study. It is shown that, when compared to time domain simulations, the traditional PV and QV analyses do not always accurately predict the saddlenode bifurcation point. Steady state PV analyses show inaccuracies between 1.8% and 16.8% (when compared to time domain simulations) in identification of the instability point. The mismatch between steady state and time domain QV analyses is between 6.1% and 22.9%. Based on the achieved results, QV analysis is shown to be typically less accurate than PV analysis for PEIG rich systems.

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Effects of Increasing Power Electronics on System Stability: Results from MIGRATE Questionnaire

Cited by 12 publications

References 3 publications

Effiziente Modellierung von Windenergieanlagen mit doppelt gespeister Asynchronmaschine und Vollumrichter für Untersuchungen der Frequenzstabilität

Effiziente Modellierung von Windenergieanlagen mit doppelt gespeister Asynchronmaschine und Vollumrichter für Untersuchungen der Frequenzstabilität

Review of Small-Signal Converter-Driven Stability Issues in Power Systems

Evaluation of PV and QV based Voltage Stability Analyses in Converter Dominated Power Systems

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