Cascade section splitting optimization method and system based on grey correlation 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: 2019-11-15
BEIJING KEDONG ELECTRIC POWER CONTROL SYST +2
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  • Abstract
  • Description
  • Claims
  • 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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  • Cascade section splitting optimization method and system based on grey correlation analysis method
  • Cascade section splitting optimization method and system based on grey correlation analysis method
  • Cascade section splitting optimization method and system based on grey correlation analysis method

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Embodiment 1

[0170] The present invention verifies the correctness of the method by taking a dual-machine system and a power grid as specific implementation cases, mainly including determining the distribution index of the oscillation center, determining the position index of the out-of-step center, determining the island unbalance degree index, and determining the power flow impact index, and calculating four The standardized index of the index is used to obtain the correlation degree between each splitting scheme and the virtual optimal splitting scheme. The specific implementation process is as follows:

[0171] build as Figure 9 The two-machine system shown. The base capacity of the system is 100MVA, the system rated voltage is 525kV, the output of the sending end is 1170MW, the load is 33MW, the output of the receiving end is 63MW, the load is 800MW, and there are 100MW loads for busbars 1-4. The reactance of the generator at the sending and receiving end is 0.04p.u., the line react...

Embodiment 2

[0188] The geographic wiring diagram of a power grid is as follows Figure 16 As shown, the system reference voltage is 800kV, and the reference capacity is 100MW. Compared with the external system, XJ system has SZ~YK transmission channel, DH~QW~JQ~HX2 transmission channel, and there are cascading sections: SZ~YK+DH~QW first level, SZ~YK+QW~JQ first level, SZ~YK +JQ~HX2 Level 1. When the three commutation failures of the XJ-WH DC line are blocked and cut flat, the system will oscillate asynchronously, and the oscillation center will drift in the cascade section.

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

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Abstract

The invention discloses a cascade section splitting optimization method and system based on a gray correlation analysis method, and the method comprises the steps: calculating the out-of-step center,oscillation center, power unbalance degree and tide impact index values of each line of a cascade section when the system is unstable; selecting the maximum value of each index to form a virtual optimal scheme; calculating a gray weighted correlation degree between each splitting scheme and the virtual optimal scheme by adopting a gray correlation analysis method; and selecting the splitting strategy with the maximum grey weighted correlation degree as an optimal splitting scheme.Four factors including the out-of-step center position, the oscillation center distribution, the island unbalance degree after splitting and the tide impact are comprehensively considered, and the rationality of splitting operation and the stability of the system are improved.

Description

technical field [0001] The invention belongs to the technical field of electric power systems, and in particular relates to a method and system for cascading cross-section disassembly optimization based on a gray relational analysis method. Background technique [0002] With the construction and development of UHV and DC projects in recent years, the regionalization and interconnection of my country's power grid structure has increased, and the transmission distance and transmission capacity have increased. If the transient instability of the local system cannot be resolved in a timely and effective manner, it may expand. The scope of the accident endangers the security and stability of the system. As the last line of defense to ensure the safe and stable operation of the system, out-of-step splitting is an effective means to eliminate the asynchronous oscillation of the power grid and prevent the accident from expanding and causing system instability. [0003] Cascade secti...

Claims

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Application Information

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Patent Type & Authority Applications(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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