جستجوی مقالات مرتبط با کلیدواژه "قابلیت عبور از ولتاژ پایین (lvrt)" در نشریات گروه "برق"

Today, the use of a Doubly-Fed Induction Generator in wind farms is expanding, due to their high efficiency compared to other generators and their flexibility in controlling active and reactive power. One of the most important topics in wind turbines is the DFIG, Low-Voltage Ride-Through (LVRT), in the event of an fault, or a sudden voltage sag across the grid. The requirement for Low-Voltage Ride-Through to cross the low voltage and to connect the unit to the grid is considered when any fault occurs. During the electrical grid fault, the current of the stator windings increases. Because of the magnetic coupling between the rotor and stator routers, this current also appears in the rotor coil rotors and the electronic converter on the rotor's side. Causing damage to the rotor's and rotor's coils and the DFIG's outgoing circuit, thus preventing damage to the rotor circuit and its converter and the DFIG output from the network Became. In this paper, in order to improve the Low-Voltage Ride-Through, a DFIG-equipped wind turbine has been utilized from a Dynamic Voltage Restorer (DVR) based on a modular multi-level inverter Modular Multilevel Cascade Converter Double-Star Chopper -Cells MMCC-DSCC cascade connection. By compensating for the voltage sag by the proposed DVR, the normal operation of the DFIG during an error (voltage sag) is provided. Due to the DFIG performance in fault situations, the value of the injected voltage by the DVR is very important because over-voltage rise affects system performance. In order to solve this problem and increase the stability of stay after failure, a proportional-integral control system (PI) has been used. In order to reduce DVR injection voltage harmonics, a multi-level inverter (MMCC-DSCC) is used in the DVR structure. Let's go the results obtained from simulations in the MATLAB / SIMULINK software environment indicate that the proposed DVR has a very good effect on improving the LVRT turbine with DFIG.