A method and system for cascading cross-section disassembly optimization based on gray relational analysis method

A grey relational coefficient, grey relational technology, applied in the field of power system, can solve problems such as unbalanced optimal power flow of subsystems, and achieve the effect of improving instability criterion, improving rationality, and determining reasonableness

Active Publication Date: 2022-06-17
BEIJING KEDONG ELECTRIC POWER CONTROL SYST +2
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  • Application Information

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Problems solved by technology

The existing literature mainly regards a certain parameter as the objective function for the selection of decoupling sections, such as unbalanced degree of subsystems after decoupling, optimal power flow, etc., and fails to consider the main principles

Method used

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  • A method and system for cascading cross-section disassembly optimization based on gray relational analysis method
  • A method and system for cascading cross-section disassembly optimization based on gray relational analysis method
  • A method and system for cascading cross-section disassembly optimization based on gray relational analysis method

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Embodiment 1

[0170] The invention takes a dual-machine system and a certain power grid as a specific implementation case to verify the correctness of the method, which mainly includes determining the oscillation center distribution index, determining the out-of-step center position index, determining the island unbalance degree index, and determining the tidal current impact index, and calculating four The standardization index of the index is used to obtain the correlation between each solution scheme and the virtual optimal solution scheme. The specific implementation process is as follows:

[0171] build as Figure 9 Two-machine system shown. The reference capacity of the system is 100MVA, the rated voltage of the system is 525kV, the output of the sending end is 1170 MW, the load is 33 MW, the output of the receiving end is 63 MW, and the load is 800 MW. The generator reactances at the sending and receiving ends are all 0.04p.u., the line reactance between each busbar is 0.01p.u., and...

Embodiment 2

[0188] The geographical wiring diagram of a power grid is as follows Figure 16 As shown, the system reference voltage is 800kV, and the reference capacity is 100MWA. Compared with the external system, the XJ system has SZ~YK transmission channels, DH~QW~JQ~HX2 transmission channels, and there are cascaded sections: SZ~YK+DH~QW level 1, SZ~YK+QW~JQ level 1, SZ~YK +JQ~HX2 level 1. When the XJ-WH DC line fails three times of commutation, blocking and leveling, asynchronous oscillation occurs in the system, and the oscillation center drifts in the cascade section.

[0189] There are two power transmission channels between XJ system and external system. Power transmission channels SZ~YK only contain one line, and this line is disconnected when asynchronous oscillation occurs between sections; there are three chain-connected lines in power transmission channels DH~QW~JQ~HX2 , it is necessary to analyze the decoupling scheme. Taking the DH~QW~JQ~HX2 line as the research object, t...

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Abstract

The invention discloses a method and system for cascading section disassembly optimization based on a gray relational analysis method. The method includes: when the system loses stability, calculate the out-of-step center, oscillation center, power unbalance degree and power flow of each line in the cascade section Impact the value of each index; select the maximum value of each index to form the virtual optimal plan; use the gray correlation analysis method to calculate the gray weighted correlation degree between each splitting plan and the virtual optimal plan; select the splitting strategy with the largest gray weighted correlation as the optimal Solution program. The present invention comprehensively considers the four factors of out-of-step center position, oscillation center distribution, unbalance degree of isolated islands after decoupling and tidal current impact, so as to improve the rationality of decoupling operation and the stability of the system.

Description

technical field [0001] The invention belongs to the technical field of electric power systems, and in particular relates to a method and a system for optimizing cascade section disassembly based on a grey relational analysis method. Background technique [0002] With the construction and development of UHV and DC projects in recent years, my country's power grid structure has become more regional and interconnected, and the transmission distance and transmission capacity have increased. If the transient instability of the local system cannot be solved in a timely and effective manner, it may expand. The scope of the accident will endanger the safety and stability of the system. As the last line of defense to ensure the safe and stable operation of the system, out-of-step decoupling is an effective means to eliminate the asynchronous oscillation of the power grid and prevent the accident from expanding and causing the system to become unstable. [0003] Cascaded section is a ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G06Q10/04G06Q10/06G06Q50/06
CPCG06Q10/04G06Q10/0637G06Q50/06
Inventor 张文朝张立伟杨俊炜李朋旺郑惠萍刘新元薄利明
Owner BEIJING KEDONG ELECTRIC POWER CONTROL SYST
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