Wind power technology - Wind Power Integration: Connection and System Operational Aspects - page 80

Controller-1 Controller-2

Figure 3.25 Wide-range synchronous generator wind turbine with a PWM-VSC

generator-side converter

V S ∠ d V R ∠0

j X

Receiving
source

Sending
source

I

S S = P S + j Q S

(a) Equivalent circuit diagram

V S

δ =

load angle
φ = power factor angle

j X I

δ

φ

V R

I

(b) Phasor diagram

Figure 3.26 Power transfer between two sources (Kundur, 1994)

Tan and Islam, 2004). The grid-side converter is normally controlled using load
angle control techniques. In this section we explain the implementation of the load
angle control scheme assuming a permanent magnet generator.

3.6.2.4 Load angle control
The load angle control technique can be explained by analysing the transfer of
active and reactive power between two sources connected by an inductive reac-
tance as shown in Figure 3.26a. The active power, P s , and reactive power, Q s ,