A symmetrical fault ride-through control method for a hybrid wind farm group including doubly-fed wind farms and permanent magnet direct-drive wind farms
A symmetrical fault and control method technology, which is applied in the direction of generator control circuit, wind power generation, control system, etc., to achieve the effect of improving the safety and stability of grid connection, improving the transient voltage level of the grid, and enhancing the ability of low voltage ride through
Active Publication Date: 2017-05-10
CHONGQING UNIV
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Problems solved by technology
However, there are still few literatures that conduct in-depth research on the low-voltage ride-through capability of hybrid wind farms including doubly-fed wind farms and permanent magnet direct-drive wind farms.
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[0047] The present invention will be described in further detail below in conjunction with the accompanying drawings.
[0048] figure 1 It is a schematic structural diagram of a hybrid wind farm group including double-fed wind farms and permanent magnet direct-drive wind farms connected to the power system. The two types of wind farms are connected to the large power grid after being connected through a common point. After the grid failure, the two types of wind farms make full use of the units The capacity provides the grid with the maximum reactive current that meets the grid code requirements to improve the grid voltage transient level.
[0049] see figure 2 , the symmetrical fault ride-through control method of the hybrid wind farm group containing doubly-fed wind farms and permanent magnet direct-drive wind farms in the present invention: for doubly-fed wind turbines, the fault duration stage is based on the grid voltage U g and the total active power P of the doubly-f...
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The invention discloses a symmetrical fault ride-through control method for a hybrid wind farm group containing a double-fed wind farm and a permanent magnetic direct drive wind farm. The symmetrical fault ride-through control method for the hybrid wind farm group containing the double-fed wind farm and the permanent magnetic direct drive wind farm comprises control on a rotor side converter and a grid side converter of a double-fed wind turbine generator and control on a motor side converter and a grid side converter of a permanent magnetic direct drive machine set. By virtue of synergistic control on the double-fed wind turbine generator and the permanent magnetic direct drive machine set, respective characteristics and current allowances of the double-fed wind turbine generator and the permanent magnetic direct drive machine set are utilized, and maximum reactive current meeting requirements in wind farm synchronization guidelines is output to a power grid under the full work condition, so that maximum reactive support is provided for network voltage, the transient voltage level of the power grid in a fault period is further improved, and low voltage ride-through capability of the whole hybrid wind farm is enhanced. The symmetrical fault ride-through control method for the hybrid wind farm group containing the double-fed wind farm and the permanent magnetic direct drive wind farm has the beneficial effects that firstly, the maximum reactive current meeting the requirements in guidelines of the power grid can be supplied to the power grid under the full work condition, and maximum reactive support is provided for the voltage of the power grid; and secondly, change of active power before and after a fault is reduced, and synchronization safety and stability of a wind power system are improved.
Description
technical field [0001] The invention relates to wind power generation technology, in particular to a symmetrical fault ride-through control method for a hybrid wind farm group including double-fed wind farms and permanent magnet direct-drive wind farms, and belongs to the field of new energy power generation. Background technique [0002] With the in-depth study of the operating characteristics of various types of wind turbines and the rapid development of the wind power industry, it is possible to flexibly choose suitable projects for investment and construction according to many factors such as the installed capacity of the wind farm group, the geographical environment of the wind farm group, the construction cost, and the requirements of the grid guideline. A variety of wind turbine types, thus forming a mixed wind farm group with different types of wind turbines. At present, due to their respective advantages, doubly-fed wind turbines and permanent magnet direct-drive wi...
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IPC IPC(8): H02J3/38H02J3/16H02P9/10H02P101/15
CPCH02J3/16H02J3/386H02P9/007H02P9/105Y02E10/76Y02E40/30
Inventor 姚骏余梦婷赵磊谭义
Owner CHONGQING UNIV