Controller Design for an Induction Generator Driven by a Variable-Speed Wind Turbine
Journal
IEEE Transactions on Energy Conversion
Journal Volume
21
Journal Issue
3
Pages
625-635
Date Issued
2006-09
Date
2006-09
Author(s)
Chen, Woei-Luen
DOI
246246/200611150121632
Abstract
This paper presents the modeling, controller design
and a steady-state analysis algorithm for a wind-driven induction
generator system. An output feedback linear quadratic controller
is designed for the static synchronous compensator (STATCOM)
and the variable blade pitch in a wind energy conversion system
(WECS) in order to reach the voltage and mechanical power control
under both grid-connection and islanding conditions. A tworeference-
frame model is proposed to decouple the STATCOM
real and reactive power control loops for the output feedback controller.
To ensure zero steady-state voltage errors for the output
feedback controller, the integrals of load bus voltage deviation and
dc-capacitor voltage deviation are employed as the additional state
variables. Pole-placement technique is used to determine a proper
weighting matrix for the linear quadratic controller such that satisfactory
damping characteristics can be achieved for the closedloop
system. Effects of various system disturbances on the dynamic
performance have been simulated, and the results reveal that the
proposed controller is effective in regulating the load voltage and
stabilizing the generator rotating speed for the WECS either connected
with or disconnected from the power grid. In addition,
proper steady-state operating points for an isolated induction generator
can be determined by the proposed steady-state analysis
algorithm. Constant output frequency control using the derived
steady-state characteristics of the isolated induction generator is
then demonstrated in this paper.
Subjects
Induction generator (IG)
static synchronous
compensator (STATCOM)
compensator (STATCOM)
voltage regulation
wind energy conversion
system (WECS)
system (WECS)
wind turbine
SDGs
Other Subjects
Linear quadratic controllers; Static synchronous compensator (STATCOM); Wind energy conversion system (WECS); Energy conversion; Feedback control; Mathematical models; Reactive power; Voltage control; Wind turbines; Asynchronous generators
Publisher
Taipei:National Taiwan University Dept Elect Engn
Type
journal article
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