Method and system for improving three-phase unbalance of wind farm grid-connected point voltage

A wind farm and point voltage technology, which is applied in the field of improving the three-phase unbalance of the grid-connected point voltage of the wind farm, can solve the problems of power system operation safety reduction, three-phase voltage unbalance, etc., and achieve the goal of improving the three-phase unbalance phenomenon Effect

Active Publication Date: 2022-05-20
ELECTRIC POWER RES INST STATE GRID JIBEI ELECTRIC POWER COMPANY +2
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Problems solved by technology

[0003] However, the problem of unbalanced three-phase voltage in the large-scale wind power collection system still exists, and no effective solution has been developed, which reduces the operation safety of the power system. Balance Improvement Methods

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  • Method and system for improving three-phase unbalance of wind farm grid-connected point voltage
  • Method and system for improving three-phase unbalance of wind farm grid-connected point voltage
  • Method and system for improving three-phase unbalance of wind farm grid-connected point voltage

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Embodiment Construction

[0069] The following will clearly and completely describe the technical solutions in the embodiments of the present invention with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only some, not all, embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without making creative efforts belong to the protection scope of the present invention.

[0070] At present, the problem of three-phase voltage imbalance in large-scale wind power collection systems still exists, and no effective solution has been developed, which reduces the operation safety of the power system. Improve methods.

[0071] In view of this, the present invention provides a method and system for improving the three-phase unbalance of the grid-connected point voltage of a wind farm. By establishing a three-phase optimized power flow mo...

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Abstract

The invention provides a method and system for improving the three-phase unbalance of the grid-connected point voltage of a wind farm. The method includes: establishing a three-phase voltage unbalance suppression model based on SVC phase-separated regulation; Construct several constraint conditions based on the element constraints of the wind farm, wherein the constraint conditions include constraints constructed by the negative sequence impedance model of the wind turbine; according to the constraints, the minimum value of the negative sequence voltage of the grid-connected point of the wind farm is used as the unbalance suppression model to solve the objective function. The present invention considers SVC phase-separated regulation, takes the minimum negative-sequence voltage of the wind farm grid-connected point as the objective function, and solves the optimal solution of the established SVC phase-separated regulation optimization model considering the power flow constraints, which can effectively improve the wind farm grid-connected point Three-phase unbalance of voltage.

Description

technical field [0001] The invention relates to the technical field of wind power collection systems, and more specifically, to a method and system for improving the three-phase unbalance of the grid-connected point voltage of a wind farm. Background technique [0002] There are two different types of wind power generation, namely: independent operation - off-grid type, and connected to the power system operation - grid-connected type. The scale of off-grid wind power generation is small, and the power supply problem in remote areas can be solved through energy storage devices such as batteries or combined with other energy generation technologies (such as wind power / hydropower complementary systems, wind power-diesel unit combined power supply systems). Grid-connected wind power generation is a large-scale wind farm with a capacity of several megawatts to hundreds of megawatts, consisting of dozens or even hundreds of wind turbines. Grid-connected wind farms can be compens...

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02J3/26H02J3/38
CPCH02J3/386H02J3/26H02J2203/20Y02E40/50
Inventor 陈璨吴林林刘辉巨云涛
Owner ELECTRIC POWER RES INST STATE GRID JIBEI ELECTRIC POWER COMPANY
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