چكيده به لاتين
Ensuring the safe and stable operation of a large power system, which is exposed to various stresses, is one of the most important challenges that power engineers face today. Accordingly, detecting stability in power grids as soon as possible in emergencies and the occurrence of various disturbances is vital to prevent collapse and blackouts and can be preventive and corrective measures. Provide the need and effectiveness for the safe and efficient operation of power systems. In this regard, many studies have been conducted on the transient stability of conventional power plants and under different conditions with the presence of synchronous generators have been evaluated and analyzed. In addition, the increasing growth and development of renewable energy sources, especially the increasing penetration of doubly fed induction generator (DFIG)-based wind farms in power systems, has created new challenges in modern power systems. Therefore, it is very important to study the behavior of wind turbines in a power system and their interaction with other production equipment and loads. Accordingly, in power systems where a significant amount of the total network production capacity is provided by wind power, wind farms should be properly presented in the transient stability analysis of the network and their effect cannot be ignored. As a result, however, the importance and complexity of power system transient stability analysis is doubled. Accordingly, and due to the extraordinary importance of the subject, the analysis of the transient stability of the network with increasing infiltration of wind farms based on DFIG is considered as the main goal of this dissertation and is focused on it.
First, it is simplified how the machine and the grid are connected. Then the grid-connected DFIG equivalent circuit is developed and the differential-algebraic equation model with the network equations in the current-balance form are extracted. Therefore, transient stability assessment (TSA) is performed using time-domain simulation, and the impact of such factors as the reactive power compensation by DFIG and the power system strength on transient stability is analyzed by increasing the wind power penetration. Given that the analysis of the impact of the presence of wind power on transient stability in single machine infinite bus (SMIB) systems has been considered by other researchers, a new SMIB system is used in this paper for TSA. Also, for further analysis, studies and transient stability analysis with increasing wind power penetration on 9-bus WSCC and 39-bus New England systems have been performed. Finally, a new approach for real-time transient instability detection (TID) is presented. The purpose of presenting this approach is to have the lowest computational load and the highest accuracy and speed and to be suitable for real-time applications. The main idea is TID without directly calculating the unstable equilibrium point (UEP). In fact, transient instability is detected only by identifying the characteristics of the UEP and the kinetic energy function along with the potential energy boundary surface function.
