| Currently there are so many ways of controlling the power in the induction generator in wind turbines. For effective control of the wind turbines, it is necessary to measure the voltage, currents and power at the terminals of the generator which can be done by developing a power control box called multi-function electronic power meter (MFEPM). This meter acts as an interface between the main supply and the programmable logic controller (PLC) that controls the wind turbine. The main objective of the thesis is to develop, design, implement and test the MFEPM.;The development of MFEPM is based on the characteristics of the asynchronous generator in wind turbines. This meter consists of three-phase voltage and current transformers, RMS chips, diodes, some passive elements, and DC power with 0-15v. For controlling the power developed by the generator, it's necessary to measure the RMS currents and RMS voltages of the main power supply.;It is also desirable to measure the power angle between the voltage and current coming from the generator in each phase. A circuit measuring this characteristic was designed and simulated in P-spice.;Furthermore, it is necessary to know the load at which the asynchronous generator is running as a motor. It is the most important factor, because it's necessary to know whether the asynchronous machine is running generator mode or motor mode to keep the operation efficient. A circuit for this function was designed and tested with simulations and a practical circuit. |
