Frequency converter in the system energy generation wind turbines

Abstract

Converter and rectifier are largely used in modern electric AC and DC drive systems leading to an increase of the higher harmonics pollution in the network. The intensive use of nonlinear converter has increased the demand for harmonics suppression and reactive power compensation. The use of passive and active filters solves the problem of non-linear loads. The designed shunt active power filter with hysteresis current control is a three-phase voltage source inverter, connected in parallel with the network. There is a constant voltage capacitor at the output. It is the power supply for the active filter. The load is an uncontrolled diode three-phase bridge rectifier with RL load. The use of active filters solves the problem of non-linear loads. The hysteresis current control principle ensures maximum response speed and accuracy of the specified signal processing. The switching frequency changes along with the current waveform. In this paper has demonstrated and confirmed the effectiveness of the proposed control method a shunt active filter. This paper presents methods of regulating the current in the shunt active power filter in the electrical drive control systems. The article discusses the active filter control system regardless of the load control system. The principles of the formation of the amplitude value of the current consumed from the network are presented: regulation by deviation; disturbance regulation and combined regulation. In this study, dynamic simulation and control of an active power filter is done using MATLAB/Simulink. Simulation results show that the input current reach the desired operating values, the current of load and current filter. The results simulation are presented in this here to show the effectiveness of the proposed control strategy and principles of the formation of the network current. Active power filter is electromagnetically compatible with the network. The total harmonic distortion (THD) of current in network 1,5%, which meets the standards international for the quality of electricity (IEEE 519 standards). The total harmonic distortion of current nonlinear load is 30%.