Control method and system for improving fault voltage of doubly-fed wind power grid-connected power system
A fault voltage and power system technology, applied in the field of power system protection and control, and power system transient control, can solve problems such as inaccurate results, transient power ranges that cannot fully utilize the transient voltage support capacity of double-fed wind turbines, etc. Achieve the effect of increasing the grid fault voltage
Active Publication Date: 2019-03-26
CHONGQING UNIV +1
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Problems solved by technology
Existing studies on the power range of DFIGs have not considered the influence of grid power flow, and the obtained results may be inaccurate. The voltage control method based on the controllable range of power also does not take into account the transient power of DFIG wind turbines under the influence of grid flow. Due to the range change, the transient voltage support capability of the doubly-fed wind turbine cannot be fully utilized
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[0092] The present invention will be further described in detail below in conjunction with the accompanying drawings.
[0093] Such as figure 1 As shown, the present invention discloses a control method for improving the fault voltage of a doubly-fed wind power grid-connected power system. The method mainly includes the following steps:
[0094] S101. Real-time measurement of the terminal voltage amplitude and phase, active and reactive power of the doubly-fed wind turbine, and calculation of the line length from the short circuit point to the doubly-fed wind turbine based on the grid parameters, unit parameters and the electrical quantity at the moment of failure of the doubly-fed wind turbine The ratio of α to the total length of the line and the transition resistance R f ;
[0095] S102. Calculate the ratio of the length of the line from the short-circuit point to the double-fed wind turbine to the total length of the line α and the transition resistance R based on the el...
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The invention discloses a control method for improving the fault voltage of a doubly-fed wind power grid-connected power system, which comprises the following steps: (1) calculating the electrical quantity of doubly-fed wind turbines at the moment of fault, and calculating the fault location and transition resistance according to the electrical quantity and the grid parameters; (2) calculating thereference value of active power control required for the maximum fault voltage within the power control range of the doubly-fed wind turbines; (3) calculating the reference value of reactive power control required for the maximum fault voltage within the power control range of the doubly-fed wind turbines; and (4) switching the power reference value of the outer loop of the rotor-side converter of the doubly fed wind turbines into the calculated power reference value at the moment of fault, so as to implement control. In view of the deficiencies of the existing voltage control method for doubly-fed wind turbines, the invention provides a control method which can accurately depict the power control capability of doubly fed wind turbines during fault period, maximize the fault voltage within the power control range and avoid the low-voltage disconnection of new energy sources from the grid, and is conducive to the restoration of grid voltage after fault.
Description
technical field [0001] The invention relates to the field of power system protection and control, specifically a control method and system for increasing the fault voltage of a double-fed wind power grid-connected power system, and belongs to the field of power system transient control. Background technique [0002] The electrical part of the double-fed wind turbine is mainly composed of an induction generator and a back-to-back converter. One side of the back-to-back converter is connected to the grid, and the other side provides excitation for the induction generator. Thanks to the rapid control capability of the converter, the doubly-fed wind turbine has strong power control capability and voltage support capability under grid failure. [0003] Based on the requirements of wind power grid-connected guidelines, wind farms need to provide 1.5(0.9-U s ) times the reactive current. In order to meet this requirement, installing reactive power compensation device is one of th...
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Login to View More IPC IPC(8): H02J3/38
CPCH02J3/386Y02E10/76
Inventor 熊小伏郑迪欧阳金鑫张真肖超唐挺崔勇赵乐张开宇冯楠熊雪君郭强冯煜尧余颖辉
Owner CHONGQING UNIV