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A voltage control method for grid-connected points of wind farms based on mixed compensation of mcr and capacitance

A technology of point voltage control and hybrid compensation, which is applied in the direction of AC network voltage adjustment and reactive power compensation, and can solve the problems of reduced possibility of wind farm ride-through faults and increased grid damage

Active Publication Date: 2016-09-14
WUHAN UNIV +1
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Problems solved by technology

[0003] At present, the research on microgrid mainly focuses on the use of fan models with P-Q decoupling control as a continuously controllable reactive power source to participate in reactive power and voltage regulation, which will reduce the possibility of wind farm ride-through faults and affect the power grid. The damage increases

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  • A voltage control method for grid-connected points of wind farms based on mixed compensation of mcr and capacitance
  • A voltage control method for grid-connected points of wind farms based on mixed compensation of mcr and capacitance
  • A voltage control method for grid-connected points of wind farms based on mixed compensation of mcr and capacitance

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Embodiment

[0044] One, at first introduce the concrete steps of the present invention, mainly comprise:

[0045] Step 1, collect real-time data of the grid-connected area of ​​the wind farm, the real-time data includes the real-time output of the wind farm, the equivalent voltage of the upper-level power grid, and the real-time load, and receive the voltage command issued by the upper-level AVC;

[0046] Step 2. Determine whether the voltage of the grid-connected point meets the requirements. If the voltage deviates from the allowable error range of the higher-level instruction voltage, that is, the voltage meets the requirements, then go to step 1; if it does not meet the requirements, go to step 3;

[0047]Step 3. Establish a site reactive power optimization model with the goal of minimizing the voltage deviation of the grid-connected point and the input of reactive power compensation equipment, establishing system constraints, and establishing a penalty function with state variable con...

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Abstract

The invention relates to a grid-connected wind power plant point voltage control method based on MCR (Magnetic Control Reactor) and capacitance mixed compensation. The method comprises the steps of collecting real-time data of a grid-connected wind power plant region, and receiving a voltage instruction issued by a superior AVC (Automatic Voltage Control); judging whether the grid-connected wind power plant point voltage meets a requirement, if not, taking the smallest grid-connected point voltage deviation and the smallest input of reactive-load compensation equipment as targets, calling a multi-target evolutionary particle swarm optimization to solve the current input reactive compensation, obtaining the final switching amount of each equipment according to a capacitance and MCR mixed compensation strategy, and issuing the same to finally realize the effect that the grid-connected wind power plant point voltage quality is kept at a higher level. The needed switching amount of each equipment can be accurately solved by the multi-objective optimization model and a static and dynamic reactive-load compensation equipment mixed compensation strategy, and the aims of rapidly responding to the instruction issued by the superior, stabilizing the grid-connected wind power plant point voltage and improving electric energy quality are achieved.

Description

technical field [0001] The invention relates to a method for controlling the voltage of a grid-connected point of a wind farm, in particular to a method for controlling the voltage of a grid-connected point of a wind farm based on mixed compensation of MCR and capacitance. Background technique [0002] With the rapid development of the power industry, the scale of wind farms is increasing year by year, and the impact of wind farms on the power grid is also increasing. Due to factors such as wind speed fluctuations and grid failures, the voltage at the grid-connected point of the wind farm will drop, and at the same time, it will cause transient problems such as speed increase, overvoltage, and overcurrent, which seriously affect the safe operation of wind turbines. In this case, the wind turbine adopts passive self-protection and disconnects from the power grid, thereby ensuring the safety of the wind turbine. However, nowadays wind power accounts for a large proportion in ...

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02J3/16
CPCY02E40/30
Inventor 邓长虹马庆龙志君文贤馗林呈辉徐梅梅赵维兴
Owner WUHAN UNIV
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