Wind power plant configuration method being beneficial to transient stability of multi-machine power system

Abstract

The invention relates to a wind power plant configuration method being beneficial to the transient stability of a multi-machine power system. After wind power plant access, a system node voltage equation is corrected and shrunk; external characteristics, representing the low voltage ride-through performance, of the wind power plant power and position information of a connected multi-machine systemof the wind power plant are reflected to electrical connection of synchronous machines; on the basis of a node power equation, a relationship of the influence on the equivalent mechanical power of the system by a wind power plant access position and a transient output characteristic is deduced; and a rule beneficial to the transient power angle of the multi-machine system is obtained based on thechanging of the equivalent mechanical power and thus a wind power plant access position and a reasonable configuration plan of the corresponding low-voltage protection measure are provided based on the rule.

Description

Technical field [0001] The invention provides a wind farm configuration method that is beneficial to the transient stability of a multi-machine power system. Background technique [0002] The ever-expanding demand for clean energy and the increasing maturity of wind power generation technology have made wind power generation vigorously developed and applied worldwide. With the continuous improvement of wind power penetration rate, the low voltage ride-through capability of large-capacity wind turbines in the event of a fault is becoming more and more important. The protection measures adopted will not only achieve low voltage ride-through but also affect the transient stability of the system[1] . my country has abundant reserves of wind energy resources. In addition to considering wind energy quality, load demand and investment income, the selection of wind farm access locations should also take into account the stability of the power system. Therefore, from the perspective of ...

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Problems solved by technology

The related research on wind farm access to power system operation stability, etc., the research object is generally a single-machine infinite system or an equivalent dual-machine system [2-4] , seldom analyze power angle transient stability directly from the perspective of multi-machine power system; and the analysis method is to give general laws through simulation analysis, lack of theoretical support, and the conclusion is not convincing [5-7]

On the other hand, most of the current research methods are based on the power angle characteristic diagram to qualitatively analyze whether the wind farm connection is beneficial to the transient stability of the power system [4,8-9] , did not demonstrate in depth the mechanism of the specific factors of wind farm access affecting the transient power angle stability of the power system, and the conclusion is one-sided

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