A Quantitative Evaluation Index System and Comprehensive Evaluation Method for UHV Connection Mode

Abstract

The invention discloses a quantitative evaluation index system of an ultrahigh voltage connection mode and a comprehensive evaluation method. The method comprises the following steps: constructing anAC-DC system model based on engineering parameters, so as to obtain running parameters of the AC-DC system model; obtaining flow distribution indexes and safety stability indexes based on the engineering parameters and the running parameters; performing level analysis to obtain each index weight in the flow distribution indexes and the safety stability indexes; drawing a sector radar map based oneach index weight of the flow distribution indexes and the safety stability indexes; extracting the characteristic quantity of each index of the flow distribution indexes and the safety stability indexes; forming an evaluation function to obtain an evaluation function value; and determining that the connection mode of connecting an ultrahigh-voltage DC system into an ultrahigh-voltage AC system ina corresponding ultrahigh-voltage AC-DC combined system is the optimal in case that the evaluation function value is the maximum. With the adoption of the system and the method, advantages and disadvantages of a DC receiving end connection mode can be effectively and comprehensively evaluated, and moreover, the safety and stability level of the AC system at the receiving end can be increased.

Description

technical field [0001] The invention belongs to the field of power systems, and more specifically relates to a quantitative evaluation index system and a comprehensive evaluation method for UHV access methods. Background technique [0002] With the completion and operation of more and more UHV DC transmission projects in the eastern and central power grids, the receiving-end AC system in the eastern and central regions has gradually evolved into a multi-infeed DC access system. Since most of these UHVDC projects use line commutated converters (LCCs), the AC power grid at the receiving end needs to provide sufficient commutation voltage. When the receiving end system is weak, it is easy to cause commutation failure, threatening the The security and stability of the terminal grid. The UHVDC receiving-end access mode will have an impact on the strength of the receiving-end AC system and its ability to support the DC system. Therefore, it will be of great significance to study...

AI Technical Summary

Problems solved by technology

[0005] Aiming at the above defects or improvement needs of the prior art, the present invention provides a quantitative evaluation index system and a comprehensive evaluation method of the UHV access mode, thereby solving the problem that the prior art cannot comprehensively evaluate the access mode of the DC transmission receiving end technical issues affecting

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