Download TIIC 2016 North America: Rotor Side Converter Control for a Wind

Rotor Side Converter Control
for a Wind Energy
Conversion System.
National Center of
Research and
Technological
Development (CENIDET)
TI Innovation Challenge 2016 Project Report
Team Leader:
Adolfo Rafael López Núñez
[email protected]
Team Members: Team Adolfo Rafael López Núñez
Team
[email protected]
Advising Professor:
Rodolfo Amalio Vargas Méndez [email protected]
The penetration of the Wind Energy Conversion Systems (WECS) is connected to
the advancement of power electronics, which has permitted the development of
efficient and low cost WECS in the last decades. A WECS configuration that has great
attention is based on a doubly fed induction generator (DFIG) and a back to back
(B2B) converter, the back to back converter is constituted by a Rotor Side Converter
(RSC) and a Grid Side Converter (GSC).
The RSC control is based in the dq reference frame model, which is based in the
DFIG model. This model gives the necessary equations to implement the control
which is implemented in a TI TMS320F28335 DSP.
Qty.
List all TI analog IC or
TI processor part
number and URL
1
TMDSDOCK28335TMS320F28335
This TI DSP is used in the acquisition of the sensors
signals and to give the commutation signals to the
IRAM IGBT modules.
3
HCPL2631
Optocouplers used to isolate the control stage from the
power stage. It provides the gate signals from the DSP
to the IRAM module.
3
TL084
It is used to condition the signals from the hall effect
sensors; it is also used to condition the voltage
sensors signals and to implement analog active filters.
1
TL082
It is used to condition the signals from the hall effect
sensors; it is also used to condition the voltage
sensors signals and to implement analog active filters.
1.- DFIG configuration system
B2B is constituted by a Rotor Side Converter (RSC), a grid side converter (GSC)
and a capacitive dc bus between both converters, see Fig. 1. In a grid connected
WECS based in a DFIG and a B2B, the RSC controls the transfer of active and
reactive power between the stator of the DFIG and the network, while the GSC
controls the reactive power through the converter and the voltage in the dc bus [1].
Fig. 1. WECS diagram based in a DFIG and a B2B
The DFIG three-phase model of the back to back converter can be written in a dq
arbitrary reference frame [2]:
𝑣𝑑𝑠 = 𝑟𝑠 𝑖𝑑𝑠 − 𝜔𝜆𝑞𝑠 + 𝜆̇𝑑𝑠
𝑣𝑞𝑠 = 𝑟𝑠 𝑖𝑞𝑠 + 𝜔𝜆𝑑𝑠 + 𝜆̇𝑞𝑠
𝑣𝑑𝑟 = 𝑟𝑟 𝑖𝑑𝑟 − (𝜔 − 𝜔𝑟 )𝜆𝑞𝑟 + 𝜆̇𝑑𝑟
𝑣𝑞𝑟 = 𝑟𝑟 𝑖𝑞𝑟 + (𝜔 − 𝜔𝑟 )𝜆𝑑𝑟 + 𝜆̇𝑞𝑟
𝜆𝑑𝑠 = (𝐿𝑙𝑠 + 32𝐿𝑚𝑠 )𝑖𝑑𝑠 + 32𝐿𝑚𝑠 𝑖𝑑𝑟
3
3
3
3
3
3
(1)
𝜆𝑞𝑠 = (𝐿𝑙𝑠 + 2𝐿𝑚𝑠 ) 𝑖𝑞𝑠 + 2𝐿𝑚𝑠 𝑖𝑞𝑟
𝜆𝑑𝑟 = (𝐿𝑙𝑟 + 2𝐿𝑚𝑠 ) 𝑖𝑑𝑟 + 2𝐿𝑚𝑠 𝑖𝑑𝑠
𝜆𝑞𝑟 = (𝐿𝑙𝑟 + 2𝐿𝑚𝑠 ) 𝑖𝑞𝑟 + 2𝐿𝑚𝑠 𝑖𝑞𝑠
where 𝑣𝑑,𝑞𝑠 and 𝑣𝑑,𝑞𝑟 are the stator and rotor voltages in the dq frame; 𝑖𝑑,𝑞𝑠 and 𝑖𝑑,𝑞𝑟
are the stator and rotor currents in the dq frame; 𝜆𝑑,𝑞𝑠 and 𝜆𝑑,𝑞𝑟 are the stator and
rotor flux linkages in the dq frame; 𝑟𝑠 is the stator resistance; 𝑟𝑟 is the rotor resistance;
𝐿𝑙𝑠 is the stator inductance; 𝐿𝑙𝑟 is the rotor inductance; 𝐿𝑚𝑠 is the mutual inductance;
𝜔𝑟 is the rotor speed; and 𝜔 is the angular speed of the reference frame.
2. RSC Controller
The process to design the RSC controller based in vector control is as follows [1].
Given that the selected reference frame is the stator flux, the obtained equations are:
didr
   r   LR iqr
dt
di
vqr  rr iqr   LR qr    r  LM ims   LR idr 
dt
vdr  rr idr   LR
(2)
From (2) it is possible to get the next subsystems:
vdr1  rr idr   LR
didr
dt
vqr1  rr iqr   LR
diqr
(3)
dt
The expressions from (3) where used to design the control for the RSC which can be
seen in Fig 2.
Fig. 2. RSC control diagram.
3.- RSC Implementation
The figure 3 shows the RSC implementation, which is controlled by the TI
TMS320F28335
DSP,
this
converter
contains
the
TI
HCPL2631
Optocoupler/Optoisolator .
Fig. 3. RSC controller
The complete implemented system is shown is Fig 4, with the TI TMS320F28335
DSP and the TI TL084 and the TI TL082.
Fig. 3. RSC controller
4.- Results
The figure 3 shows the rotor current and the rotor voltage at a rotor speed of 3200
rpm.
5.- Bibliography
[1]
G. Calderón, J. Mina, and A. López, “Modelado y simulación de un Sistema de
Conversión de Energía Eólica de velocidad variable interconectado a la red
eléctrica .,” XVI Congreso Latinoamericano de Control Automático, 2014.
[2]
P. C. Krause, O. Wasynczuk, and S. D. Sudhoff, Analysis of Electric Machinery
and Drive Systems, Second. John Wiley and Sons, 2002.