Optimal design of the wide area damping controller with the aim of improving the low frequency oscillations of the power system in the presence of the wind power plant

نوع: Type: Thesis

مقطع: Segment: PHD

عنوان: Title: Optimal design of the wide area damping controller with the aim of improving the low frequency oscillations of the power system in the presence of the wind power plant

ارائه دهنده: Provider: Babak Keshavarz Zahed

اساتید راهنما: Supervisors: Dr. Mohammad Hassan Moradi

اساتید مشاور: Advisory Professors:

اساتید ممتحن یا داور: Examining professors or referees: Alireza Hatami, Dr. Mohsen Parsa Moghaddam, Dr. Mohammad Azimi

زمان و تاریخ ارائه: Time and date of presentation: 2025

مکان ارائه: Place of presentation: 34

چکیده: Abstract: Given the increasing trend of depletion of fossil fuel resources and the environmental consequences of their consumption, including the widespread production of greenhouse gases, attention to renewable energy sources as a sustainable alternative has been emphasized more than ever. Renewable energy sources have introduced new technologies such as wind power plants into power grids. Technologies that, despite their environmental and sustainability benefits, have also created new challenges in the design and operation of power systems. One of the fundamental challenges in the operation of wind farms is maintaining the stability of the power system under different operating conditions. System stability must be guaranteed in such a way that it demonstrates stable and reliable performance in the face of uncertainties such as the variable and fluctuating nature of the wind, the occurrence of transient or permanent faults in the network, sudden changes in the consumption load, fluctuations in the mechanical power input to synchronous generators, as well as time delays in large-scale power systems. In this thesis, FACTS devices have been used to improve small signal stability and also increase damping in electromechanical oscillations. Parallel FACTS devices have been used to compensate reactive power and maintain voltage amplitude, and series FACTS devices have been used to increase line transmission power and reduce low frequency oscillations in the presence of wind farms. Considering that the use of traditional methods in the control structure of wind units and FACTS devices in the presence of the aforementioned uncertainties, they are not able to maintain the stability of the power system optimally, for this reason, the use of the robust controller proposed in this thesis has been considered to maintain the stability of the network. On the other hand, in this thesis, a wide area damping controller (WADC) has been used to improve the control of inter-area oscillation modes by considering variable time delays in sending the measured signals. Due to the limitations and high conservatism of traditional control methods in systems with time delays, in this thesis, the proposed robust control method uses the free weight matrix (FWM) approach to solve the stability problem and design a WADC controller in power systems with time delays that can be both robust against disturbances and uncertainties and effectively improve the effect of time delays on the control performance. In order to investigate the efficiency of the proposed control method, simulations have been performed using MATLAB software and in the SIMULINK environment on a 10-machine power system and a 16-machine power system. To demonstrate the performance of the proposed method, different scenarios have been considered and the proposed control method has been compared with classical methods, which shows that the proposed control method has a better and more effective performance in maintaining network stability against uncertainties, disturbances and time delays.

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