Hybrid wind power plant group coordination control method under power grid asymmetrical faults

A coordinated control and asymmetric technology, which is applied in the mixed wind farm group. The mixed wind farm can effectively suppress the negative sequence voltage of the grid-connected point. Field output power quality degradation and other issues

Inactive Publication Date: 2017-09-08
CHONGQING UNIV
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Problems solved by technology

However, under the grid asymmetrical fault condition, there will still be negative sequence components in the grid voltage and current, which will interact with the positive sequence voltage and current components to cause serious fluctuations in the output power of the hybrid wind farm
When an asymmetrica

Method used

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  • Hybrid wind power plant group coordination control method under power grid asymmetrical faults
  • Hybrid wind power plant group coordination control method under power grid asymmetrical faults
  • Hybrid wind power plant group coordination control method under power grid asymmetrical faults

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Embodiment Construction

[0052] Specific embodiments of the present invention will be described in detail below in conjunction with the accompanying drawings.

[0053] figure 1 It is a schematic structural diagram of a hybrid wind farm group including a 30MW permanent magnet direct drive wind farm and a 30MW asynchronous wind farm connected to the power system. The two types of wind farms are connected to the large power grid through a common point (PCC point). When the power grid is asymmetrically faulty, the permanent magnet direct drive wind farm makes full use of its grid-side converter, while ensuring the dynamic reactive power support capability of the hybrid wind farm, and cooperatively controls the negative-sequence current to suppress the negative-sequence voltage of the grid, so as to improve the efficiency of the asynchronous wind farm. Fault ride-through capability and grid-connected power quality.

[0054] Such as figure 2 As shown, the present invention is a coordinated control strate...

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Abstract

The invention discloses a hybrid wind power plant group coordination control method under power grid asymmetrical faults, and relates to control of a grid-side converter and a machine-side converter of a permanent magnet direct drive wind power system; the hybrid wind power plant group comprises a permanent magnet direct drive wind power plant and an asynchronous wind power plant; in the premise of not increasing hardware equipment, the active power output of the permanent magnet direct drive wind power plant is limited while the current margin of the grid-side converter is fully utilized; on the basis of controlling the output of the grid-side converter to satisfy positive sequence reactive power of the power grid guiding rule, the residual current margin is utilized to output a negative sequence current to realize synergistic inhibition of the grid-connected point negative sequence voltage, reduce adverse influence of the operation behaviors of the permanent magnet direct drive wind power plant to the operation behaviors of the asynchronous wind power plant, and effectively improve the power-grid fault operation capability and the grid-connected electric energy quality of the asynchronous wind power plant.

Description

technical field [0001] The invention relates to the technical improvement of a hybrid wind farm group containing a permanent magnet direct drive wind farm and an asynchronous wind farm, in particular to a method for the hybrid wind farm to effectively suppress the negative-sequence voltage of a grid-connected point under an asymmetrical fault of the power grid, and belongs to the technical field of electric power control . Background technique [0002] Because different types of wind turbines have their own characteristics, in the expansion and reconstruction of old wind farms and the construction of new wind farms, it is an important trend for large-scale wind power utilization to use different types of wind turbines to form a hybrid wind farm and use different types of wind turbines to coordinate with each other. one. Since most of my country's wind power resources are concentrated in remote areas, the connection to the main power grid is weak, and asymmetric faults in th...

Claims

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Application Information

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IPC IPC(8): H02J3/38
CPCH02J3/386H02J2203/20Y02E10/76
Inventor 姚骏李嘉伟刘瑞阔徐德鹏
Owner CHONGQING UNIV
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