Impact of Synchrophasor Estimation Algorithms in ROCOF-Based Under-Frequency Load-Shedding

Zuo, Yihui; Frigo, Guglielmo; Derviškadić, Asja; Paolone, Mario

doi:10.1109/tpwrs.2019.2936277

Cited by 42 publications

(28 citation statements)

References 42 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…In this context, Phasor Measurement Units (PMUs) provide an effective tool to track the network state in any node of interest with reporting rates in the order of tens of frames per seconds. The availability of such distributed measurement infrastructure has triggered the development of more sophisticated local [6] and centralized UFLS methods [13] that exploit the frequency and ROCOF information. In this regard, ROCOF-based relays have shown to provide a prompter and more effective response thanks to the anticipative effect inherent in their time-derivative formulation [14].…”

Section: Literature Reviewmentioning

confidence: 99%

“…In order to emulate realistic load patterns, load profiles are adapted from real measurements. The model is available online [31] and thorough details are provided in [33].…”

Section: Performance Assessmentmentioning

confidence: 99%

“…In traditional implementations, the load shedding action depends only on frequency thresholds [2], [3], [4]. Conversely, recent literature has proposed adaptive UFLS methods where the relay considers also the disturbance magnitude [5] or the Rate-of-Change-of-Frequency [6] in order to provide a prompter system reaction.…”

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

OPF-based under frequency load shedding predicting the dynamic frequency trajectory

Walger

Zuo

Derviškadić

et al. 2020

Electric Power Systems Research

Self Cite

View full text Add to dashboard Cite

The paper describes a centralized Under Frequency Load Shedding (UFLS) method, where load shedding decisions are based on the solution of an optimization problem. The proposed approach anticipates the evolution of the grid frequency trajectory by means of a system dynamic model. Moreover, the method is augmented by the equations derived from the Optimal Power Flow (OPF) problem allowing to constrain asymptotic values of node voltages and line currents. The proposed OPFbased method differs from traditional UFLS methods as it enables the user to compute the minimum amount of load to be shed and, at the same time, provides a feasible grid trajectory. The trajectory of the system frequency due to the contingency, and the subsequent load shedding, is predicted over the entire time horizon by means of a second-order dynamic model. The feasibility and applicability of the proposed method are assessed by means of numerical simulations carried out using a real-time simulator, where the time-domain full-replica model of the IEEE 39-bus system has been implemented. Two contingency scenarios are investigated and the performance of the proposed method is compared against the UFLS strategy recommended by the European Network of Transmission System Operators (ENTSO-E). The metrics used for such a comparison are the amount of energy not served, the frequency variation and the violation of the grid safety constraints.

show abstract

Section: Literature Reviewmentioning

confidence: 99%

“…In order to emulate realistic load patterns, load profiles are adapted from real measurements. The model is available online [31] and thorough details are provided in [33].…”

Section: Performance Assessmentmentioning

confidence: 99%

See 1 more Smart Citation

OPF-based under frequency load shedding predicting the dynamic frequency trajectory

Walger

Zuo

Derviškadić

et al. 2020

Electric Power Systems Research

Self Cite

View full text Add to dashboard Cite

show abstract

“…In a relatively short period of time, significant portions of conventional centralized generating capacities were replaced by distributed renewable energy sources, mostly interfacing with EPSs via semi-conductive power converters [1]. This can be seen as both a blessing and a curse, since Energies 2020, 13, 3607 2 of 17 power converters are indeed able to provide a convenient fast-acting intervention, but unfortunately not inherently.…”

Section: Introductionmentioning

confidence: 99%

“…Yet, most of those published methods appear complex and require the use of advanced mathematical techniques, several of which are non-transparent. Many of the methods rely either on real-time communication between a vast number of protective devices all across the EPS [12,13] or the assumption of having accurate enough information about the involved EPS inertia [14][15][16]. As a result, apart from a few individual pilot projects, no significant progress has been made in this field so far, especially concerning practical applicability.…”

Section: Introductionmentioning

confidence: 99%

Proving a Concept of Flexible Under-Frequency Load Shedding with Hardware-in-the-Loop Testing

et al. 2020

View full text Add to dashboard Cite

It is widely recognized that in the transition from conventional electrical power systems (EPSs) towards smart grids, electrical voltage frequency will be greatly affected. This is why this research is extremely valuable, especially since rate-of-change-of-frequency (RoCoF) is often considered as a potential means of resolving newly arisen problems, but is often challenged in practice due to the noise and its oscillating character. In this paper, the authors further developed and tested one of the new technologies related to under-frequency load shedding (UFLS) protection. Since the basic idea was to enhance the selected technology’s readiness level, a hardware-in-the-loop (HIL) setup with an RTDS was assembled. The under-frequency technology was implemented in an intelligent electronic device (IED) and included in the HIL setup. The IED acted as one of several protection devices, representing a last-resort system protection scheme. All main contributions of this research deal with using RoCoF in an innovative UFLS scheme under test: (i) appropriate selection and parameterization of RoCoF filtering techniques does not worsen under-frequency load shedding during fast-occurring events, (ii) locally measured RoCoF can be effectively used for bringing a high level of flexibility to a system-wide scheme, and (iii) diversity of relays and RoCoF-measuring techniques is an advantage, not a drawback.

show abstract

Adaptive decentralized fuzzy logic‐based underfrequency load shedding to enhance power system stability

Saboune

Ladjici

Tiguercha

2021

Int Trans Electr Energ Syst

View full text Add to dashboard Cite

The underfrequency load-shedding mechanism remains the last resort to maintain the stability of the power grid after a major disturbance, which allows the system to operate at the safety limit, thus saving the system from blackout. In this article, a fuzzy logic decentralized adaptive underfrequency load-shedding (UFLS) scheme is proposed. The objective is to provide a robust ULFS scheme, based on local measurements of frequency, rate of change of frequency (ROCOF), and voltage deviation. The proposed design adapts the amount of load to be shed with the severity of each event to maintain system stability and frequency, and voltages within operating limits. In order to evaluate the effectiveness of the proposed UFLS scheme, different scenarios, with various disturbances, were simulated and tested on the IEEE 39-bus test system. The simulation results show that, compared to conventional, semi-adaptive, and other adaptive UFLS systems, the proposed approach manages to preserve the frequency and voltage stability of the system by adapting the amount of load to be shed on each bus to the severity of each event.

show abstract

Impact of Synchrophasor Estimation Algorithms in ROCOF-Based Under-Frequency Load-Shedding

Cited by 42 publications

References 42 publications

OPF-based under frequency load shedding predicting the dynamic frequency trajectory

OPF-based under frequency load shedding predicting the dynamic frequency trajectory

Proving a Concept of Flexible Under-Frequency Load Shedding with Hardware-in-the-Loop Testing

Adaptive decentralized fuzzy logic‐based underfrequency load shedding to enhance power system stability

Contact Info

Product

Resources

About