Method and device for processing bus load in dynamic equivalence of power system
A power system, dynamic equivalent technology, applied in the field of value, can solve problems such as not meeting error requirements, large equivalent errors, transient characteristics differences, etc.
Active Publication Date: 2021-05-25
ELECTRIC POWER RESEARCH INSTITUTE, CHINA SOUTHERN POWER GRID CO LTD
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Problems solved by technology
However, in practice, there are often motor loads in the power system. When the load model adopts the ZIP+motor load model, the dynamic equivalent program of the power system using the current conversion method will bring a large equivalent error, which directly affects the equivalent value of the system. Accuracy often leads to a large difference between the transient characteristics of the system after equivalence and the system before equivalence, which does not meet the error requirements
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[0042] 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.
[0043] It should be noted that, in the embodiments of the present invention, words such as "exemplary" or "for example" are used for example, illustration or description. Any embodiment or design solution described as "exemplary" or "for example" in the embodiments of the present invention shall not be construed as being more preferred or more advantageous than other embodiments or design solutions. Rather, the use of words such as "exemplary" or "such as" is ...
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Embodiments of the present invention provide a method and device for processing bus loads in dynamic equivalence of a power system. The equivalence field of the power system is designed to reduce errors in system transient characteristics after dynamic equivalence of the power system. This method first converts the first comprehensive load model of all buses in the power system before dynamic equivalence into the first constant power load model, then determines the first bus that needs to be reserved in the power system and performs dynamic equivalent on it, and then according to the dynamic In the first comprehensive load model of the first busbar before equivalence, the proportional coefficient of the load value of various loads to the total load value of the first busbar converts the second constant power load model of all buses in the power system after dynamic equivalence to In the second comprehensive load model, the stator impedance of the motor load in the second comprehensive load model of the first bus is adjusted according to the difference of the three-phase short-circuit capacity of the first bus before and after the dynamic equivalence, so as to reduce the Errors in the transient characteristics of power systems.
Description
technical field [0001] The invention relates to the field of electric power system equivalents, in particular to a method and device for processing bus loads in dynamic equivalents of electric power systems. Background technique [0002] Power system dynamic equivalent is a modeling method to simplify the power system to reduce the scale. The basic requirements for the dynamic equivalent of the power system are: the power system after the dynamic equivalent and the power system before the dynamic equivalent in the steady state characteristics (including line flow, bus voltage, bus short-circuit capacity) and transient characteristics (including the same fault The following line active and reactive power fluctuation curves, bus voltage fluctuation curves and bus frequency fluctuation curves) are consistent, and the error is within the allowable range. The existing power system dynamic equivalent method mainly adopts the coherent equivalent method, and the method steps mainly...
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IPC IPC(8): H02J3/00
CPCH02J3/00H02J3/003H02J2203/20
Inventor 刘蔚甄鸿越陈刚王长香张东辉
Owner ELECTRIC POWER RESEARCH INSTITUTE, CHINA SOUTHERN POWER GRID CO LTD