Quantitative evaluation index system of ultrahigh voltage connection mode and comprehensive evaluation method

A technology of access mode and quantitative evaluation, applied in the field of power system, can solve the problems of inability to comprehensively evaluate the impact of DC transmission terminal access mode, and achieve the effect of improving the level of safety and stability and uniform distribution of power flow

Active Publication Date: 2018-06-29
HUAZHONG UNIV OF SCI & TECH +3
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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

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  • Quantitative evaluation index system of ultrahigh voltage connection mode and comprehensive evaluation method
  • Quantitative evaluation index system of ultrahigh voltage connection mode and comprehensive evaluation method
  • Quantitative evaluation index system of ultrahigh voltage connection mode and comprehensive evaluation method

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[0129] Example 1

[0130] The simulation platform of the present invention is the Chinese version of the BPA power flow and transient stability program of the Window2007 / Xp platform, the data used is the 2018 winter flat peak operation mode of the State Grid, and the DC model uses the DA quasi-steady state model based on the ABB actual DC control system. At present, UHV DC receiving end access methods are mainly divided into single-layer and hierarchical access methods. The present invention designs 8 feasible access modes for ±1100kV DC receiving terminals, as shown in the table. The receiving-end converter station in the connection modes 3 and 4 is connected to the 1000kV AC power grid in a single layer, the receiving-end converter station in the connection modes 5 and 6 is connected to the 500kV AC power grid in a single layer, and the other access modes are hierarchical connection. Entry method. Such as Figure 4 As shown, it shows the schematic diagram of access mode 1. In...

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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 grid commutated converters (1ine 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...

Claims

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Application Information

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IPC IPC(8): H02J5/00H02J3/06G06Q10/06G06Q50/06
CPCG06Q10/06393G06Q50/06H02J3/06H02J5/00H02J2203/20
Inventor 姚伟熊永新沈郁艾小猛文劲宇文卫兵乐波
Owner HUAZHONG UNIV OF SCI & TECH
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