Calculation method and system for short-circuit current provided by double-fed fan
A double-fed fan and short-circuit current technology, which is applied in calculation, design optimization/simulation, special data processing applications, etc., can solve calculation and other problems, and achieve the effect of strong robustness and rigorous calculation methods
Pending Publication Date: 2021-10-22
CHINA ELECTRIC POWER RES INST +2
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[0014] The technical solution of the present invention provides a method and system for calculating the short-circuit current provided by a doubly-fed fan to solve the problem of how to calculate the short-circuit current provided by a doubly-fed fan
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[0067] Exemplary embodiments of the present invention will now be described with reference to the drawings; however, the present invention may be embodied in many different forms and are not limited to the embodiments described herein, which are provided for the purpose of exhaustively and completely disclosing the present invention. invention and fully convey the scope of the invention to those skilled in the art. The terms used in the exemplary embodiments shown in the drawings do not limit the present invention. In the figures, the same units / elements are given the same reference numerals.
[0068] Unless otherwise specified, the terms (including scientific and technical terms) used herein have the commonly understood meanings to those skilled in the art. In addition, it can be understood that terms defined by commonly used dictionaries should be understood to have consistent meanings in the context of their related fields, and should not be understood as idealized or over...
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The invention discloses a calculation method and system for short-circuit current provided by a doubly-fed fan, and the method comprises the steps of determining the parameters of the doubly-fed fan, and determining that the control strategy of the doubly-fed fan is a Crowbar input control strategy; based on the determined parameters of the doubly-fed fan and a Crowbar input control strategy, calculating the short-circuit impedance Zf1 of the doubly-fed fan, reducing the calculated short-circuit impedance of the doubly-fed fan to the high-voltage side of the unit transformer, and obtaining the reduced short-circuit impedance Zf of the doubly-fed fan; calculating the short-circuit impedance Zs of the power supply unit of the doubly-fed fan based on the reduced short-circuit impedance of the doubly-fed fan and the short-circuit impedance Zt of the unit transformer; based on the power transmission line, transformer impedance admittance parameters, direct-axis sub-transient reactance of synchronous and asynchronous motors, double-fed fan power supply unit short-circuit impedance, and a rated voltage Un and the like, forming a nodal admittance matrix Y; and solving a node impedance matrix Z based on the node admittance matrix Y by using a triangular decomposition method, and calculating the short-circuit current based on the node impedance matrix Z.
Description
technical field [0001] The invention relates to the technical field of power system planning and operation, and more specifically, to a calculation method and system for short-circuit current provided by a doubly-fed fan. Background technique [0002] In power system planning, design and operation control, short-circuit current calculation is required for the selection of system equipment capacity parameters, setting of protection device setting and operation mode arrangement. The calculation results of short-circuit current have a great influence on the coordination of safety and economy of the system. If the calculation result is too large, it is necessary to select larger-capacity switching electrical equipment and increase investment; it may also cause the short-circuit level evaluation results of many sites to exceed the standard, increase investment in additional current limiting measures, and may also reduce system operation reliability. If the calculation result is ...
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IPC IPC(8): G06F30/20G06Q50/06
CPCG06F30/20G06Q50/06
Inventor 张玉红张彦涛孙华东陆润钊贺静波卜广全李亚楼郭强王雪琼张健叶俭张立波覃琴赵珊珊
Owner CHINA ELECTRIC POWER RES INST