Multiobjective optimal setting for UFLS relays considering voltage deviation

Alizadeh, Mohammad; Jafari‐Nokandi, Meysam; Amraee, Turaj

doi:10.1002/etep.2770

Cited by 4 publications

(3 citation statements)

References 32 publications

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“…The basic working principle is to compare the phase of the input signal with the phase of the reference signal, and then constantly correct and control through the feedback loop, so as to keep the phase difference between the input signal and the reference signal constant. So as to ensure the stable grid connection operation of the microgrids [4] .…”

Section: Pll Analysismentioning

confidence: 99%

Research on microgrids grid-connected inverter system based on improved PLL

Chen,

Li,

Chen

2024

Eighth International Conference on Energy System, Electricity, and Power (ESEP 2023)

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In this paper, we study a grid-connected inverter system based on improved PLL. Firstly, the power quality of the microgrid grid-connected system is analyzed from different angles. Then, the structure of the the loop and its phase-locking principle are briefly introduced, and the limitations of the software loop are indicated. Subsequently, the improved scheme of using second order generalized integral to extract positive order components and eliminate harmonics is analyzed in detail. Finally, we build a simulation model using MATLAB to improve the phase locked loop, and it shows that the adopted phase locked loop can correctly and quickly phase locking during the grid voltage distortion.

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Section: Pll Analysismentioning

confidence: 99%

Research on microgrids grid-connected inverter system based on improved PLL

Chen,

Li,

Chen

2024

Eighth International Conference on Energy System, Electricity, and Power (ESEP 2023)

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“…In order to overcome this limitation, UFLS methods are formulated as optimization problems that minimize the expected amount of shed loads, taking into account the dynamic system frequency response [18], as well as the unnecessary activation of protection relays [19]. A multi-objective mixedinteger linear program is proposed in [20] to minimize the load shedding amount and voltage deviation simultaneously.…”

Section: Literature Reviewmentioning

confidence: 99%

“…As regards the generators, their active power is determined based on the generator's droop characteristic: (20) In particular, as long as the computed active power deviation P g is lower than the maximum attainable power output, the droop characteristic is considered. Otherwise, the power is set to the generator's maximum set-point.…”

Section: Generatorsmentioning

confidence: 99%

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

Walger

Zuo

Derviškadić

et al. 2020

Electric Power Systems Research

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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.

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

Saboune

Ladjici

Tiguercha

2021

Int Trans Electr Energ Syst

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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.

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Multiobjective optimal setting for UFLS relays considering voltage deviation

Cited by 4 publications

References 32 publications

Research on microgrids grid-connected inverter system based on improved PLL

Research on microgrids grid-connected inverter system based on improved PLL

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

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

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