ABSTRACT
In recent years, renewable energy generation has become a suitable choice for distributed energy systems. Among several sources of renewable energy, the demand for wind energy is increasing at an exponential rate, due to its advantages such as being environmentally clean, abundant availability, and so on. In this scenario, a variable speed wind energy system (VSWES) is mostly preferred in the distribution system as it captures more energy from the available wind speed. For VSWES doubly-fed induction generator (DFIG) or permanent magnet synchronous generator (PMSG) is widely adopted. For small-scale applications in the distribution system, the PMSG based standalone VSWES has attracted much interest due to its immense advantages, such as gearless construction, absence of external supply for the rotor field, large power density, low noise, high efficiency, and less maintenance. In the VSWES, to capture more power and to enhance the system performance different maximum power point tracking (MPPT) algorithms are introduced by the authors. These existing MPPT algorithms are implemented with two-stage power electronic converters, that is, an uncontrolled ac-dc converter along with a dc-dc converter used in the system. Here, in this chapter, the mathematical modelling of wind turbine (WT) and PMSG are analysed. In addition to capture maximum power, a dc-dc boost converter is designed. The maximum power point (MPP) is determined with the gradual increase of the duty cycle and the respective characteristics are plotted. To verify the MPP, the system incorporates a speed sensor dependent and speed sensorless conventional P&O MPPT methods are done using MATLAB\Simulink software. The results are analysed, which ensures the satisfactory performance of wind turbine system (WTS) under wind speed and load change scenarios.
