analysis on DFIG wind power system low voltage ride through
作者:
所属专业方向:
风力发电低压穿越
摘要:
Due to the double fed induction generator’s (DFIG)
advantage of controlling active and reactive power
independently and partial power converter, DFIG is becoming
a popular type of wind power generation system. Nowadays,
the grid code demands that the wind power generator
possesses the ability of riding through the grid voltage sags,
only when the grid voltage drops below the specific curve, the
wind turbine is allowed to disconnect. DFIG wind power
system has serious problems with the corresponding voltage
sag as its partly power converter: depending on the depth and
the conditions at the start of the sag, current, power and
reactive power peaks may exceed rated values and may lead to
a system shut down. The experiment system includes a DC
motor, a DFIG, a 3-phase diode rectifier, a converter, a
crowbar and a voltage sags generator. The DC motor simulates
the behavior of wind turbine, the 3-phase diode rectifier and
the converter controls the DFIG, the crowbar is connected to
the rotor of DFIG and the converter. The voltage sags
generator provides the voltage sags event for the experiment
system. The controller of the converter and crowbar includes
DSP and FPGA. It judges the moment of voltage sags and trigs
the crowbar, so is the key part of the LVRT system.The
simulation and experiment result shows that the dynamic
response of inner current loop of rotor side converter is
important for damping the transient current during voltage
sags. The converter in the rotor side with crowbar using the dq
transfer voltage measure method could reduce the transient
current in rotor and stator. The DFIG system with crowbar
could quickly recover from the voltage sags and provide
reactive power to support the grid. So crowbar is important
for improving LVRT capability of DFIG.The converter with
crowbar in the rotor side implement the LVRT of DFIG, it
could send reactive power during voltage sags.
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发表于 2009-10-22 10:15:16
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