An adaptive reactive power compensation operation method for doubly-fed wind farms
An operation method and technology for wind farms, applied in reactive power compensation, reactive power adjustment/elimination/compensation, wind power generation, etc. Running scheduling complexity and other issues
Active Publication Date: 2016-04-20
STATE GRID CORP OF CHINA +2
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The above distribution principles and the reactive power output of all wind turbines increase the active power loss of the collector system and the unit, affect the service life of the unit, and increase the complexity of the operation and scheduling of the entire wind farm
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[0026] The technical solutions in the embodiments of the present application will be clearly and completely described below in conjunction with the drawings in the embodiments of the present application.
[0027] The adaptive reactive power compensation operation method of a doubly-fed wind farm provided by the present invention simplifies the power dispatching control system of the doubly-fed wind farm, improves the operating efficiency of the doubly-fed wind farm, figure 1 A flow chart of the method is shown, and the specific steps are:
[0028] Step 1: The power dispatching control system detects in real time the active power output by the doubly-fed wind farm and the grid-connected point voltage U pcc ; Obtain the reactive upper limit Q of each wind turbine igmax and reactive power limit Q of doubly-fed wind farm wfmax , i=1,2...n;
[0029] The upper limit of reactive power of wind turbines Q ig max ...
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The invention provides a double-fed wind power plant adaptive reactive power compensation operation method. The method comprises the following steps: the step 1, the reactive power upper limit Qigmax of each wind turbine generator and the reactive power limit Qwfmax of the double-fed wind power plant are acquired; the step 2, the reactive power demand reference value Qdem of the double-fed wind power plant is calculated according to the grid-connected point voltage offset delta U%; the step 3, if the Qdem is less than or equal to the Qwfmax, then the number k of the wind turbine generator subjected to reactive power compensation according to the reactive power demand reference valueQdem, and the reactive power reference value of each wind turbine generator is acquired; the step 4, if the Qdem is greater than the Qwfmax, then the n wind turbine generators are subjected to reactive power compensation at the same time, and the reactive power reference value of each wind turbine generator is acquired; and the step 5, the reactive power reference value is distributed to the wind turbine generator stator side and network side converter respectively to perform reactive power compensation, and then the process returns to the step 1. Compared with the prior art, the double-fed wind power plant adaptive reactive power compensation operation method provided in the invention can be used to reduce the active loss of the wind turbine generators and simplify the power dispatch control system of the wind power plant so as to improve the operation efficiency of the wind power plant.
Description
technical field [0001] The invention relates to a reactive power compensation method of a wind farm, in particular to an adaptive reactive compensation operation method of a double-fed wind farm. Background technique [0002] At present, the proportion of wind farms connected to the power grid is increasing, and most of them are located in remote areas or on the sea. Stability poses a threat, and the operation and control methods of wind turbines also have a great impact on the voltage stability of wind farms and grids. At present, doubly-fed wind turbines can decouple active power and reactive power. Both the stator side and the grid side converter of the unit can inject reactive power into the grid, dynamically compensate the reactive power consumption of the load, and provide voltage support for the grid. . In view of the widespread voltage instability of wind farms connected to the power grid in some remote areas, considering the reactive power support capability of wi...
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IPC IPC(8): H02J3/38H02J3/18
CPCY02E10/76Y02E40/30
Inventor 朱凌志赵大伟刘皓明张磊王湘艳唐俏俏李晨晨袁晓玲
Owner STATE GRID CORP OF CHINA