On the Injection of Sub/Inter-Harmonic Current Components for Active Anti-Islanding Purposes

Voglitsis, Dionisis; Valsamas, Fotis; Rigogiannis, Nick; Papanikolaou, Nick

doi:10.3390/en11092183

Cited by 21 publications

(9 citation statements)

References 17 publications

(63 reference statements)

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“…However, micro-invertersbased techniques are getting quite popular these days for their modular approach and their effectiveness in regards to the canceling effect, without communication between parallel operating inverters. A comprehensive mathematical framework for sub/inter harmonic current injection and their limitations, especially in the case of parallel operation of DERs is discussed in [31]. The paper proposes an effective strategy to deal with the distortion effect of Pdc-MICs output and the canceling effect (compensating integer multiple of synchronous harmonic injections to the EPS) by means by introducing a time delay parameter in the control loop.…”

Section: Islanding Detection Methodsmentioning

confidence: 99%

Islanding Detection for Inverter-Based Distributed Generation Using Unsupervised Anomaly Detection

et al. 2021

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Islanding detection with the rising grid supporting inverter-based distributed generation is becoming more critical protection due to its high droop gains and overall decreased system inertia leading to rapid changes in the electrical parameters. Traditional methods for islanding detection in this regard are susceptible to significant problems such as non-detection zone, false-positive detection, and inefficient mode of validation. Therefore, to attenuate these problems, this paper proposes a hybrid islanding detection technique based on unsupervised anomaly detection using autoencoders. This technique uses the rate of change of frequency as primary and phase angles of the voltage and current as secondary detection parameters, demonstrating improved performance, reliability, and robustness due to its shared advantage of both active frequency drift and autoencoder. Furthermore, a dialectic model of offline and online validation schemes is also proposed to ensure the reliability of detection. Extensive simulations and validations have been carried out on multiple networks to generate data sets used to train, test, and validate the technique and compute its statistical significance, thereby confirming its effectiveness. The optimal islanding detection time for the base cases was recorded as 20 milliseconds with an F1-score of 0.991, dependability index of 0.998, security index of 0.995, with total harmonic distortion of 4.56% and zero non-detection zones, which complies with IEC 61000-3-2 and IEEE standard 1547's requirement of detection within two seconds after islanding.

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Section: Islanding Detection Methodsmentioning

confidence: 99%

Islanding Detection for Inverter-Based Distributed Generation Using Unsupervised Anomaly Detection

et al. 2021

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“…Hence, an issue with irregular current injection methods is how to avoid the mutual offset between irregular currents in multi-DG operation, i.e., the compatibility issue with such methods. This issue has been mentioned to a certain extent in [25]. Nevertheless, a more systematic study is needed.…”

Section: Andmentioning

confidence: 98%

Compatibility Issues with Irregular Current Injection Islanding Detection Methods and a Solution

et al. 2019

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Islanding detection methods, based on injecting high-/low-frequency currents or negative sequence fundamental frequency currents and observing the resultant responses, are collectively referred to as irregular current injection methods in this paper. In multi-distributed generation (DG) operation, if there is no restriction to the phase of injected irregular currents, the currents at the same frequency may cancel each other out, and then their convergent current may be too small to cause a detectable response, for which reason islanding detection will be severely affected. Accordingly, this paper raises a compatibility issue, which requires the phase difference between any two injected irregular currents to be within a certain interval. In response to this issue, a solution is proposed. According to this solution, the terminal voltage of DG units is referenced to conduct irregular currents injection, and only certain high-frequency currents are used as injected currents. If this solution is adopted by as many manufacturers as possible, the effect and reliability of such methods will be greatly improved.

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“…Active techniques may cause power quality problems and harmonic disturbance due to external signal injection, and therefore, the system performance can be degraded [25]. Impedance measurement (IM), active frequency drift (AFD), Sandia frequency shift (SFS), Sandia voltage shift (SVS), and sliding mode frequency shift (SMFS) are some of the examples of active IdMs [26]. Active IdMs are mostly developed for inverter-based DG systems [27].…”

Section: Active Idmsmentioning

confidence: 99%

Comprehensive Review of Islanding Detection Methods for Distributed Generation Systems

et al. 2019

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The increased penetration of distributed generation (DG), renewable energy utilization, and the introduction of the microgrid concept have changed the shape of conventional electric power networks. Most of the new power system networks are transforming into the DG model integrated with renewable and non-renewable energy resources by forming a microgrid. Islanding detection in DG systems is a challenging issue that causes several protection and safety problems. A microgrid operates in the grid-connected or stand-alone mode. In the grid-connected mode, the main utility network is responsible for a smooth operation in coordination with the protection and control units, while in the stand-alone mode, the microgrid operates as an independent power island that is electrically separated from the main utility network. Fast islanding detection is, therefore, necessary for efficient and reliable microgrid operations. Many islanding detection methods (IdMs) are proposed in the literature, and each of them claims better reliability and high accuracy. This study describes a comprehensive review of various IdMs in terms of their merits, viability, effectiveness, and feasibility. The IdMs are extensively analysed by providing a fair comparison from different aspects. Moreover, a fair analysis of a feasible and economical solution in view of the recent research trend is presented.

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On the Injection of Sub/Inter-Harmonic Current Components for Active Anti-Islanding Purposes

Cited by 21 publications

References 17 publications

Islanding Detection for Inverter-Based Distributed Generation Using Unsupervised Anomaly Detection

Islanding Detection for Inverter-Based Distributed Generation Using Unsupervised Anomaly Detection

Compatibility Issues with Irregular Current Injection Islanding Detection Methods and a Solution

Comprehensive Review of Islanding Detection Methods for Distributed Generation Systems

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