Page 182 - Renewable Energy Devices and System with Simulations in MATLAB and ANSYS

Small Wind Energy Systems 169

3Φ grid
Q ref P ref v DC (s)
Grid connection switch PCC abc to α–β v ⠏ Current reference VDG(s) DC-link plant

P storage =P W –P L  i β v α  i* α – + i* β i* (s)

local load
Variable
to α–β
abc
 i α – + Pl H(s) Inverter+ LCL filter plant
Battery storage
LCL filter Stationary frame current controller PWM(s)
P grid,ref α–β axis control
P L v α v β
Controlled dummy load Converter SPWM α–β to abc v DC  – + v* DC Current controller Stationary frame current controller

+ – PMSG wind turbine controller with maximum power optimization and a back-to-back pulse-width modulation (PWM) grid-connected inverter with load
v DC sin θ e ˆ i (s) i a power (s)
3Φ PWM Converter SPWM d–q to abc Unit vector X Power calc.

v* qs v* ds cos θ e t Pl voltage controller

θe – P ref Q ref
i qs  – 2π
abc to d–q + – ∫ 2π Reset every 2π v DC (s) +
i ds  + ˆ
i* ds i* qs
θ e P/2
reference ω e
Flux
Pl
+ r–opt
ω*
–
PMSG ω r  MPPT Peak power tracking controller tuned for the C p (λ) of the turbine
T w

V W ≥V cut–in Wind turbine real-time measurements
V w P w

FIGURE 7.13 management.