Modelling and analysis guidelines for slow transients. II. Controller interactions; harmonic interactions

Iravani, M.R.; Chandhary, A.K.S.; Giesbrecht, W.J.; Hassan, I.E.; Keri, A.J.F.; Lee, K.C.; Martínez, J.A.; Morched, A.S.; Mork, B.A.; Parniani, Mostafa; Sarshar, A.; Shirmohammadi, D.; Walling, R.; Woodford, Dennis

doi:10.1109/61.517533

Cited by 10 publications

(2 citation statements)

References 24 publications

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“…The regulations associated with many devices that are encountered in large power grids, that is to say the regulations FACTS devices, HVDC converters, Adjustable series capacitors, voltage regulators (AVR) and power generators and power stabilizers (PSS), have natural oscillation modes at sub-synchronous frequencies (typically from 1 Hz to 35 Hz) [20], [21]. Depending on the "electrical distances" between the devices, these regulations can interact with each other, sustaining oscillations or even causing dynamic instability [22]. Another type of regulatory interaction is the interaction between a regulation and a natural oscillation mode of a network element.…”

Section: Regulatory Interactionsmentioning

confidence: 99%

Interaction of FACTS devices with loads dynamics in the transport networks and interconnection

Al-Azzawi

Ali²

2022

IJPEDS

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This paper introduced analysis and improvement of power networks stability. It focused on the impact of flexible AC transmission systems (FACTS) device interaction with the other components of the network. It investigated the impact of dynamic charges on the ability of FACTS to eliminate power oscillations problems. A small-signal analysis, frequency analysis and non-linear time simulations using EUROSTAG made it possible to study these problems. Other, research has shown that the damping loops of the power oscillations effects using classical techniques of sensibility are not robust in relation to the variations of load models. Thus, this paper proposed a method based on the sensitivity of the eigenvalues and it takes into account the variations of the load models. The method calculates an optimal phase compensator based on a weighted average of the sensitivity of the target mode. It considers the variations of sensitivity as a function of the uncertainty in the load model. According to the obtained results, this method is effective in most stability problems.

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Section: Regulatory Interactionsmentioning

confidence: 99%

Interaction of FACTS devices with loads dynamics in the transport networks and interconnection

Al-Azzawi

Ali²

2022

IJPEDS

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“…The authors of [28] reported that WTGs are commonly modeled as a constant impedance in low frequency transients. Naturally, this replacement was also applied in the WTGs modeling for studying energization transients, and examples can be found in [29,30].…”

Section: Energization With Different Load Typesmentioning

confidence: 99%

Modeling and Mitigation for High Frequency Switching Transients Due to Energization in Offshore Wind Farms

2016

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This paper presents a comprehensive investigation on high frequency (HF) switching transients due to energization of vacuum circuit breakers (VCBs) in offshore wind farms (OWFs). This research not only concerns the modeling of main components in collector grids of an OWF for transient analysis (including VCBs, wind turbine transformers (WTTs), submarine cables), but also compares the effectiveness between several mainstream switching overvoltage (SOV) protection methods and a new mitigation method called smart choke. In order to accurately reproduce such HF switching transients considering the current chopping, dielectric strength (DS) recovery capability and HF quenching capability of VCBs, three models are developed, i.e., a user-defined VCB model, a HF transformer terminal model and a three-core (TC) frequency dependent model of submarine cables, which are validated through simulations and compared with measurements. Based on the above models and a real OWF configuration, a simulation model is built and several typical switching transient cases are investigated to analyze the switching transient process and phenomena. Subsequently, according to the characteristics of overvoltages, appropriate parameters of SOV mitigation methods are determined to improve their effectiveness. Simulation results indicate that the user-defined VCB model can satisfactorily simulate prestrikes and the proposed component models display HF characteristics, which are consistent with onsite measurement behaviors. Moreover, the employed protection methods can suppress induced SOVs, which have a steep front, a high oscillation frequency and a high amplitude, among which the smart choke presents a preferable HF damping effect.

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2016

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Modelling and analysis guidelines for slow transients. II. Controller interactions; harmonic interactions

Cited by 10 publications

References 24 publications

Interaction of FACTS devices with loads dynamics in the transport networks and interconnection

Interaction of FACTS devices with loads dynamics in the transport networks and interconnection

Modeling and Mitigation for High Frequency Switching Transients Due to Energization in Offshore Wind Farms

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