جستجوی مقالات مرتبط با کلیدواژه « : power system stabilizer (pss) » در نشریات گروه « برق »

To improve the stability of the power system, the design of a PSS and STATCOM controller parameters using ABC is presented as an optimization problem in this paper. The ABC is a collective intelligence based on the optimization algorithm and inspired by the bee feeding behavior in finding food. Fast convergence and high accuracy are the capabilities of this algorithm. The effectiveness and robustness of the bee colony algorithm are shown by nonlinear simulation of a two-area power system consisting of four machines and compared with the particle swarm optimization method. Simultaneous design of power system controller and stabilizer parameters with bee cloning algorithm over non-optimized mode increases oscillation damping speed and improves power system stability. The simulation results are presented using MATLAB software for different system conditions.

The safe operation of power system depends on its stability and security supply in all times. The dynamic instability (small signal instability) is one of phenomena that results in power system instability and has been discussed as a challenge in power system control and operation from a long time ago. Commonly the dynamic instability appears as undamped low frequency electromechanical oscillations or with insufficient damping. In order to damp these oscillations and improve dynamic stability, the use of Power System Stabilizer (PSS) in excitation systems is the most effective option. In this paper the impact of PSSs of various units of a real power plant on Iran grid dynamic stability is investigated and its performance is improved. In this way first the excitation system and PSS model of the power plant are identified and verified, and then the main parameters of PSSs are optimally retuned using the proposed method based on Particle Swarm Optimization (PSO) algorithm. In the following, power plant operation is considered in different disturbances with respect to the retuned PSSs, so that, the effect of optimal parameters on local and inter-area oscillation modes damping is taken into account, not only within time domain analysis, but also within frequency domain analysis. The results of proposed flexible and comprehensive analysis display the suitable performance of retuned PSSs.

Power system stabilizer (PSS) does not have a significant impact on inter-area modes and FACTS devices are used to damping these modes and to enhance power system stability. In this article, an objective function based on different and variable weight coefficients according to eigenvalues condition is proposed and optimization parameters of power system stabilizer and variable impedance parameters include static VAR compensator (SVC) and thyristor controlled series capacitor (TCSC), (Including amplifying gain rate and time constant of phase-compensating blocks) is done using genetic algorithm in harmony. Also, in the process of optimization, the location of the FACTS devices and the control signal are considered as optimization parameters. Simulation results on IEEE 68-bus system show improvement damping of inter-area modes using the proposed method.

Increasing penetration level of modern generating units, in response to growing need for electrical energy and environmental issues, besides changing inherent of distribution systems and loads introduces new uncertainties into the power systems. In order to deal with such uncertainties, measurement-based control schemes are introduced in modern power systems. An attempt is made in this paper to propose a new measurement-based approach for tuning of excitation system parameters in large-scale power systems. For this purpose, Center of Gravity (COG) concept in corporation with fault propagation paradigm are introduced to reduce power system dimensions. In this framework, the power system dynamic behavior is represented by an equivalent model in which the geographical areas interact with the COG through unique fictitious interconnectors. Then, a new control scheme proposes in which utilizes post-fault system dynamics in the rotor angle-terminal voltage deviations portrait to design a coordinated Automatic Voltage Regulator (AVR)-Power System Stabilizer (PSS). Basic power system equations are employed to derive a case-independent algorithm. Effectiveness of the proposed method is examined for different fault scenarios on the 16 machines IEEE benchmark system.