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Ultra-high-voltage AC/DC hybrid grid stability analysis method

A technology of AC/DC hybrid and analysis method, applied in the field of stability analysis of level AC/DC hybrid power grid, to achieve the effect of improving adequacy and scientificity

Inactive Publication Date: 2017-05-10
国网内蒙古东部电力有限公司经济技术研究院 +2
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Problems solved by technology

This makes its shortcomings especially exposed when evaluating some accidents with a small probability of occurrence but very serious consequences

Method used

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  • Ultra-high-voltage AC/DC hybrid grid stability analysis method
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  • Ultra-high-voltage AC/DC hybrid grid stability analysis method

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Embodiment Construction

[0051] The present invention proposes a method for analyzing the stability of the UHV grade AC-DC hybrid power grid, especially based on the analysis of the cascading faults and large-scale power outages caused by the UHV power grid failure, and accurately assessing the stability of the failure consequences for risk assessment and improving The sufficiency and scientificity of the system security and stability analysis; specifically, the following steps are included:

[0052] 1) Establish a deterministic AC-DC hybrid UHV power grid component fault model, form a component fault set, and select an appropriate trigger accident;

[0053] 2) Carry out power flow calculation and stability calculation on the system to reach the convergence state;

[0054] 3) Calculate the system risk index according to the simulation calculation results;

[0055] 4) According to the threshold value of the system index, the system failure is processed.

[0056] The present invention will be further ...

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Abstract

The invention discloses an ultra-high-voltage AC / DC hybrid grid stability analysis method based on risk assessment in the technical field of electric power system reliability. The method, on the basis of reasonably setting system fault and carrying out analog simulation, introduces risk assessment indexes, comprising important components of low-voltage risk, power angle difference risk and frequency instability risk and the like. The method is characterized by, after determining a component outage model, selecting system failure states and calculating probability thereof; carrying out simulated assessment on the consequence of each selected state; and finally, calculating risk indexes and analyzing stability of a power grid. Compared with a conventional power grid stability analysis method, the method combines the accident occurring probability and the consequence of each index loss and combines risk and benefit, and quantitatively reflects system safety indexes, so that the method is more suitable for stability analysis of a complex hybrid grid when having cascading failure or large-area blackout.

Description

technical field [0001] The invention belongs to the technical field of power system reliability, and in particular relates to a method for analyzing the stability of an ultra-high voltage AC / DC hybrid power grid. Background technique [0002] The distribution of my country's energy centers and load centers is uneven. The construction of UHV transmission systems with long-distance, large-capacity, and low-loss transmission capabilities is an inevitable requirement for optimal allocation of energy, improvement of power grid structure, and coordinated economic and social development. However, with the continuous development of the power grid, the voltage level is gradually increased, and the shape of the power system is more complex, showing strong dynamic and nonlinear characteristics. This also leads to more complex fault forms, fault propagation, and fault consequences of the power grid, making it more difficult to analyze the safety and stability of the system. [0003] At...

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Application Information

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IPC IPC(8): H02J5/00H02J3/06
CPCH02J3/06H02J5/00H02J2203/20
Inventor 许云飞金国锋党伟龙日尚刘阳蒙园张建华李颖超赵树野
Owner 国网内蒙古东部电力有限公司经济技术研究院
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