Study Of Inverter-Interfaced Wind Power Generation System Under Balanced & Unbalanced Grid Voltage Conditions

By: Babu, B. ChittiContributor(s): Mohanty, K B [Supervisor] | Department of Electrical EngineeringMaterial type: TextTextLanguage: English Publisher: 2012Description: 191 pSubject(s): Engineering and Technology | Electrical Engineering | Power ElectronicsOnline resources: Click here to access online Dissertation note: Thesis (Ph.D)- National Institute of Technology, Rourkela Summary: This thesis presents the control of grid - side converter (GSC) for wind turbine based power generation system under balanced and unbalanced grid voltage conditions. For that Doubly - Fed Induction Generator (DFIG) with two back - to - back bi - directional voltage source converters are considered and are examined in the laboratory experimental set - up through DSP TMS320F2812 dig ital processor platform. The major role of GSC is to interact with the utility grid. Moreover, the control of GSC is necessary to meet the following objectives 1): control of active power delivered to the grid, control of reactive power exchanged between t he DFIG and the utility grid, control of the DC - link voltage, power quality improvement and grid synchronization etc. Grid - Side converter (GSC) control is an obvious choice to optimize the power quality problems, harmonic compensation and full reactive pow er support to the grid by reactive current injection during grid abnormalities. Under balanced condition, voltage oriented control (VOC) algorithm is studied in the grid - side converter (GSC) in order to control the active and reactive power of the grid ind ependently through control of i d and i q components of the grid currents. However, the converter performance largely depends on the applied current control strategy in the inner control loop. In this study, there are three current controllers are projected namely; SVPWM with Proportional Integral (PI) c urrent controller, hysteresis current controller (HCC), and adaptive hysteresis current controller (AHCC) and their performance is analyzed during steady state and transient conditions. SVPWM with Proportional Integral (PI) current controller is implemented in the synchronous rotating reference frame ( dq reference frame ) control algorithm. HCC and AHCC are implemented in the natural reference frame ( abc reference frame ) control algorithm. Further, a comparative study is made between the three current controllers, in order to ensure the sinusoidal current injected into the grid. The performance indices include THD of the grid current, DC - link utilization, dynamic response etc. In addition to that, control of grid - side converter control is also studied during unbalanced grid voltage conditions. During unbalanced condition of the grid voltages, operation of grid side converter is decisive due to failure of detecting exact grid flux position for voltage oriented cont rol (VOC) algorithm; unless an independent control for the positive and the negative sequence is implemented. In this study, detection of positive fundamental component and negative sequence component are achieved by phase locked loop (PLL) using double ro tating reference frames to transform the input signal. The control strategy applied to grid - side converter is implemented in stationary (αβ) reference frame using fast acting proportional - resonant (PR) current controller. The effectiveness of the technique s studied in this dissertation is demonstrated by both simulation and experimental results based on TMS320F2812 digital signal processor platform
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Thesis (Ph.D/M.Tech R) Thesis (Ph.D/M.Tech R) BP Central Library
Thesis Section
Reference Not for loan T164

Thesis (Ph.D)- National Institute of Technology, Rourkela

This thesis presents the control of grid
-
side converter (GSC) for wind turbine based
power generation system under
balanced and unbalanced grid voltage conditions. For that
Doubly
-
Fed Induction Generator (DFIG) with two back
-
to
-
back bi
-
directional voltage source
converters are considered and are examined in the laboratory experimental set
-
up through DSP
TMS320F2812 dig
ital processor platform. The major role of GSC is to interact with the utility
grid. Moreover, the control of GSC is necessary to meet the following objectives 1): control of
active power delivered to the grid, control of reactive power exchanged between t
he DFIG and
the utility grid, control of the DC
-
link voltage, power quality improvement and grid
synchronization etc. Grid
-
Side converter (GSC) control is an obvious choice to optimize the
power quality problems, harmonic compensation and full reactive pow
er support to the grid by
reactive current injection during grid abnormalities. Under balanced condition, voltage oriented
control (VOC) algorithm is studied in the grid
-
side converter (GSC) in order to control the active
and reactive power of the grid ind
ependently through control of i
d
and i
q
components of the grid
currents.
However, the converter performance largely depends on the applied current control
strategy in the inner control loop. In this study, there are three current controllers are projected
namely; SVPWM with
Proportional Integral (PI) c
urrent controller, hysteresis current controller
(HCC), and adaptive hysteresis current controller (AHCC) and their performance is analyzed
during steady state and transient conditions.
SVPWM with Proportional
Integral (PI) current
controller is implemented in the synchronous rotating reference frame (
dq reference frame
)
control algorithm. HCC and AHCC are implemented in the natural reference frame (
abc
reference frame
) control algorithm. Further, a comparative
study is made between the three
current controllers, in order to ensure the sinusoidal current injected into the grid. The
performance indices include THD of the grid current, DC
-
link utilization, dynamic response etc.
In addition to that, control of grid
-
side converter control is also studied during unbalanced grid
voltage conditions. During unbalanced condition of the grid voltages, operation of grid side
converter is decisive due to failure of detecting exact grid flux position for voltage oriented
cont
rol (VOC) algorithm;
unless an independent control for the positive and the negative
sequence is implemented.
In this study, detection of
positive fundamental component and
negative sequence component are achieved by phase locked loop (PLL) using double ro
tating
reference frames to transform the input signal.
The control strategy applied to grid
-
side converter
is implemented in
stationary (αβ) reference frame
using fast acting proportional
-
resonant (PR)
current controller. The effectiveness of the technique
s studied in this dissertation is demonstrated
by both simulation and experimental results
based on TMS320F2812 digital signal processor
platform

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