A voltage control method for different working conditions and different modes for doubly-fed wind farms
A voltage control method and technology for doubly-fed wind farms, which are applied in wind power generation, AC network voltage adjustment, reactive power compensation, etc., can solve the problem that the reactive power requirements of wind farms cannot be fully met, and the reactive power adjustment capability is affected by changes in active power output. and other problems, to achieve the effect of reducing construction and operation and maintenance costs, reducing spare capacity, improving qualification rate and stability level
Inactive Publication Date: 2018-02-13
STATE GRID SHANDONG ELECTRIC POWER COMPANY WEIFANG POWER SUPPLY +2
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Problems solved by technology
The doubly-fed induction wind turbine has a certain reactive power adjustment ability, but its reactive power adjustment ability is affected by the change of active power output, which is not enough to fully meet the reactive power demand of the wind farm. The reactive power compensation of the doubly-fed wind farm also needs to be considered
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[0035] Below in conjunction with accompanying drawing and embodiment the present invention will be further described:
[0036] Such as figure 1 As shown, the present invention is used for the sub-working mode sub-mode voltage control method for doubly-fed wind farms, including:
[0037] Step 1: Receive the voltage reference value of the grid-connected PCC point of the doubly-fed wind farm issued by the grid dispatching center And collect the real-time voltage of the grid-connected PCC point of the doubly-fed wind farm in real time
[0038] Step 2: Determine whether the PCC point voltage is satisfied Among them, U D is the allowable fluctuation range of the voltage, if satisfied, return to step 1; if not satisfied, proceed to the next step;
[0039] Step Three: Judgment Whether it is established, where, U T is the allowable voltage fluctuation threshold, if it is true, the reactive voltage control of the DFIG wind farm is in the normal voltage control mode; otherwise...
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The invention discloses a divided working condition and divided mode voltage control method for a double-fed wind farm. The method comprises steps: 1, a voltage reference value U<PCC><ref> at a grid-connected PCC point of the double-fed wind farm issued by a grid dispatching center is received, and real-time voltage U<PCC><real> at the grid-connected PCC point of the double-fed wind farm is acquired in real time; 2, whether the PCC point voltage meets |U<PCC><ref>- U<PCC><real>|< / =UD is judged, UD is a voltage fluctuation allowing range, in the case of meeting, the first step is carried out, or otherwise, the third step is carried out; and 3, whether UD< / =|U<PCC><ref>- U<PCC><real>|< / =UT can be realized is judged, UT is a voltage fluctuation allowing threshold, in the case of realization, reactive power voltage control for the double-fed wind farm is in a normal voltage control mode, or otherwise, an emergency voltage control mode is in.
Description
technical field [0001] The invention belongs to the field of voltage control of doubly-fed wind farms, and in particular relates to a voltage control method for the doubly-fed wind farms according to working conditions and modes. Background technique [0002] Due to the randomness, volatility and intermittent nature of wind power, the reactive power and voltage of wind farms has become one of the important factors affecting the safe and stable operation of wind farms and even the entire power grid. After the wind power development strategy of "centralized transmission", frequent operation accidents in which wind turbines in wind farms were disconnected from the grid due to voltage problems made the problem of reactive power and voltage control in wind farms urgent to be solved. [0003] A large number of literatures at home and abroad have done in-depth research on the reactive power and voltage problems of wind power grid connection. The wind turbine components are divided...
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IPC IPC(8): H02J3/38H02J3/16
CPCY02E10/76Y02E40/30
Inventor 晋飞林勇赵斌财傅磊王亮张冰王林潘立顺丁力王兆胜孙董强于刚张致东胡宗光韩宏伟殷成福张忠政满光涛孙景俊孟国栋
Owner STATE GRID SHANDONG ELECTRIC POWER COMPANY WEIFANG POWER SUPPLY