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Effective damping of local low frequency oscillations in power systems integrated with bulk PV generation

Protection and Control of Modern Power Systems 2021年第1期6卷 512-524页

作者： Ahmed Hesham Abd El-Kareem Mohamed Abd Elhameed Mahmoud M.Elkholy Operation Engineer at New Capital Power Plant New Capital CityEgypt Electrical Power and Machines Department Faculty of EngineeringZagazig UniversityZagazigEgypt

High penetration of renewable sources into conventional power systems results in reduction of system inertia and noticeable low-frequency oscillations (LFOs) in the rotor speed of synchronous generators. In this paper, we propose effective damping of LFOs by incorporating a supplementary damping controller with a photovoltaic (PV) generating station, where the parameters of this controller are coordinated optimally with those of a power system stabilizer (PSS). The proposed method is applied to damp local electromechanical modes by studying a system comprising a synchronous generator and a PV station connected to an infinite bus. The PV station is modeled following the instructions of the Western Electricity Coordinating Council. The problem is modeled as an optimization problem, where the damping ratio of the electromechanical modes is designed as the objective function. Constraints including upper and lower limits of decision parameters and damping ratio of other modes are considered by imposing penalties on the objective function. Different optimization algorithms are used to pursue the optimal design, such as political, improved gray wolves and equilibrium optimizers. The results validate the effectiveness of the proposed controller with PSS in damping local modes of oscillations.

关键词： low frequency oscillations Damping controller PV WECC

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Design of a robust PID-PSS for an uncertain power system with simplified stability conditions

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Protection and Control of Modern Power Systems 2020年第1期5卷 222-237页

作者： Vijaya Lakshmi A.S.V Ramalinga Raju Manyala Siva Kumar Mangipudi Department of EEE G.V.P College of Engineering for WomenVisakhapatnamIndia Department of EEE JNTU KakinadaKakinadaIndia Department of EEE Gudlavalleru Engineering CollegeGudlavalleruAndhra PradeshIndia

In a deregulated power system uncertainty exists and lack of sufficient damping can lead to low frequencyoscillations (LFO). The problem can be addressed using robust Power System Stabilizers (PSS). In this paper, anoptimal procedure to design a robust PID-PSS using interval arithmetic for the Single Machine Infinite Bus (SMIB)power system is proposed. The interval modelling captures the wide variations of operating conditions in boundsof system coefficients. In the proposed design procedure, simple and new closed loop stability conditions for anSMIB interval system are developed and are used to design an optimum PID-PSS for improving the performance ofan SMIB system. The optimum PID-PSS is attained by tuning the parameters using the FMINCON tool provided inMATLAB. The robustness of the proposed PID-PSS design is validated and compared to other notable methods inthe literature when the system is subjected to different uncertainties. The simulation results and performance errorvalues show the effectiveness of the proposed robust PID-PSS controller.

关键词： low frequency oscillations Uncertainty Power system stabilizer Robust controller Interval systems

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An Improved Immune Clone Selection Algorithm for Parameters Optimization of Marine Electric Power System Stabilizer

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Energy Engineering 2022年第3期119卷 907-928页

作者： Zong Bi Weifeng Shi Tiewei Song Department of Electrical Engineering Shanghai Maritime UniversityShanghai201306China

In themarine electric power system,the marine generators will be disturbed by the large change of loads or the fault of the power *** marine generators usually installed power system stabilizers to damp power system oscillations through the excitation *** paper proposes a novel method to obtain optimal parameter values for Power System Stabilizer(PSS)to suppress low-frequency oscillations in the marine electric power *** this paper,a newly developed immune clone selection algorithm was improved from the three aspects of the adaptive incentive degree,vaccination,and adaptive mutation ***,the typical PSS implementation type of leader-lag structure was adopted and the objective function was set in the optimization *** performance of PSS tuned by improved immune clone selection algorithm was compared with PSS tuned by basic immune clone selection algorithm(ICSA)under various operating conditions and ***,an improved immune clone selection algorithm(IICSA)optimization technique was implemented on two test systems for test *** on the simulations,it is found that an improved immune clone selection algorithm demonstrates superiority over the basic immune clone selection algorithm in getting a smaller number of iterations and fast convergence rates to achieve the optimal parameters of the power system ***,the proposed approach improves the stability and dynamic performance under various loads conditions and disturbances of the marine electric power system.

关键词： Marine electric power system excitation system immune clone selection algorithm low frequency oscillations power system stability

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