Wind power farm operation method
A technology for wind farms and wind farms, applied in the field of reactive power control of wind turbines, which can solve problems such as high voltage ride-through or low voltage ride-through of wind turbines
Inactive Publication Date: 2018-01-19
YUANJIAN WIND POWER JIANGYINENVISION ENERGY CO LTD
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Problems solved by technology
[0006] The present invention aims at the problem that the reactive power control of the current wind field may cause the wind turbine to enter a high-voltage ride-through or low-voltage ride-through event, and proposes a method for wind farm operation to control the wind turbine to work within a limited voltage range in real time
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[0016] In order to control the voltage of the wind turbine, the following test is done: the voltage of the wind turbine is transmitted to the wind farm controller through communication, when the wind farm controller detects that the voltage of any fan in the wind farm is higher than 1.08pu or lower than 0.92pu, The wind farm controller stops the calculation and sends the reactive power value calculated in the previous step to the wind turbine. If the active power value of the wind turbine is less than 50kw, the wind turbine will not generate reactive power. The test results are: the goal of reactive power control cannot be achieved; the reactive power of the wind turbine cannot be fully utilized; the wind farm controller will stop working when the voltage of any wind turbine in the wind farm exceeds the limit. Obviously this simple limitation and conventional control means cannot meet the requirements.
[0017] Such as figure 2 The control schematic diagram of the wind farm ...
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The invention relates to a wind power farm operation method. The method comprises the steps that a wind field controller works out a reference value of fan reactive power, after amplitude limiting isconducted through a reactive limiter, the reference value is sent to each fan in the wind field, wherein the maximum value and the minimum value of the reactive limiter are determined through a staticmaximum reactive power value and a static minimum reactive power value; the reactive power value obtained after amplitude limiting reaches each fan, the reactive power value reference value reachingeach fan is subjected to amplitude limiting through the dynamic limiter of the fan and then compared with a measured reactive power value of the fan, a difference value obtained through comparison issent to a fan reactive controller which outputs reactive current reference value to a reactive current controller, and then it is guaranteed that reactive power of the fan at an outlet reaches the reference value. A dynamic limiter reactive limit value is generated by fan voltage through limit control, the phenomenon that due to the fact that reactive power control is improper, fan supervoltage orlow-voltage work is generated in grid-connection to damage the fans is avoided, and it can be controlled that the fans work within a limit voltage range.
Description
technical field [0001] The invention relates to a method for controlling reactive power of a fan, in particular to a method for operating a wind farm. Background technique [0002] The reactive power control of the wind farm is realized through double-loop control. The inner loop is realized by the reactive power controller of the fan, and the outer loop is realized by the reactive power controller of the wind farm. [0003] Such as figure 1 The reactive power control diagram of the current wind farm is shown, Upcc_ref is the voltage reference value of the grid-connected point, Upcc is the measured value of the grid-connected point voltage, and their difference is input into the wind farm voltage controller regulatorC1(s), and the wind turbine no The reference value Qturb_Ref of power is sent to each wind turbine in the wind farm. During the sending process, there is a delay of communication time between when the wind turbine actually receives it (the wind farm controller ...
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IPC IPC(8): H02J3/16
CPCY02E40/30
Inventor 殷波邓恒李磊
Owner YUANJIAN WIND POWER JIANGYINENVISION ENERGY CO LTD