Wind Energy Generation

Fixed-speed Wind Turbine

Fixed-speed Wind Turbine

Fixed-speed Wind Turbine

Control model of the soft-starter

Variable-speed Wind Turbine Doubly Fed Induction Generator (DFIG) Wind Turbine

Variable-speed Wind Turbine Fully rated converter-connected wind turbine

Variable-speed Wind Turbine Fully rated converter-connected wind turbine

Variable-speed Wind Turbine Fully rated converter-connected wind turbine

Variable-speed Wind Turbine

Variable-speed Wind Turbine

Variable-speed Wind Turbine

Synchronous Generator Control

Excitation Control System

Regulator A synchronous generator employs an automatic voltage regulator (AVR) to maintain the generator stator terminal voltage close to a predefined value. If the generator terminal voltage falls due to increased reactive power demand, the change in voltage is detected and a signal is fed into the exciter to produce an increase in excitation voltage. The generator reactive power output is thereby increased and the terminal voltage is returned close to its initial value.

Exciter The purpose of an exciter is to supply an adjustable direct current to the main generator field winding. The exciter may be a DC generator on small set sizes. On larger sets, commutation problems prohibit the use of DC generators and AC generators are employed, supplying the field via a rectifier. Static excitation systems are also widely used. These comprise a controlled rectifier usually powered from the generator terminals and permit fast response excitation control. In all the mentioned cases, the DC supply is connected to the synchronous generator field via slip rings.

Load Compensation The AVR normally controls the generator stator terminal voltage. Building an additional loop to the AVR control allows the voltage at a remote point on the network to be controlled. The load compensator has adjustable resistance and reactance that simulates the impedance between the generator terminals and the point at which the voltage is being effectively controlled. Using this impedance and the measured current, the voltage drop is computed and added to the terminal voltage.

Power System Stabilizer The basic function of the power system stabilizer (PSS) is to add damping to the generator rotor oscillations by controlling its excitation. The commonly used auxiliary stabilizing signals to control the excitation are shaft speed, terminal frequency and power.

Single-phase equivalent circuit of an induction machine

Load Angle Control Technique

Load Angle Control Technique

Vector Control Technique

Rotor Flux Oriented Control Technique