Stability evaluation method based on correlation between power grid operation and transient stability margin index

Abstract

The invention discloses a stability evaluation method based on correlation between power grid operation and a transient stability margin index. The method comprises the following steps of establishing a power grid safety stability hierarchical correlation analysis model based on offline simulation data and real-time monitoring data of the power grid, and performing transient stability hierarchical correlation characteristic extraction according to the model; performing discrete semantic description of the power grid operation characteristic and the transient stability margin index, and performing correlation relation identification between the power grid operation characteristic and the transient stability margin index; and establishing a stability correlation characteristic rule database, and performing quick stability determination and reason analysis on power grid operation state change according to the rule database. The stability evaluation method has advantages of quickly evaluating the current stability level according to a system operation state, supplying quantitative information support for auxiliary decision of operation personnel, improving standardization, speed and self-adapting capability in power grid stability evaluation, and realizing wide application prospect.

Description

technical field [0001] The invention relates to the technical field of power grid security, in particular to a stability evaluation method based on the correlation between power grid operation and transient stability margin indicators. Background technique [0002] With the access of large-scale renewable energy and the continuous expansion of grid interconnection scale, the security and stability analysis and dispatch operation control of the power system are facing more severe challenges. The traditional power grid monitoring system (SCADA) is difficult to obtain real-time information after system faults. The transient stability analysis and decision-making of the power grid usually conducts offline analysis for the expected fault set, and then gives auxiliary decisions, and then the dispatcher performs the final operation based on his own experience. The complex and changeable operation mode of the current power grid makes it difficult to fully match the actual operating ...

AI Technical Summary

Problems solved by technology

The complex and changeable operation mode of the current power grid makes it difficult to fully match the actual operating conditions with the offline analysis method, and the online analysis calculation also faces problems such as the selection of fault sets and the difficulty in ensuring real-time performance; , it is unrealistic to analyze and make decisions in a short period of time after unforeseen successive failures

[0003] Moreover, with the expansion of the grid scale and the continuous improvement of control and protection methods, the probability of grid stability damage due to a single fault or disturbance is extremely low

However, the development of large-scale and complex power grids makes the dispatching business rules change frequently, and the power grid operation management department is requesting to maximize the transmission capacity of the existing transmission system to obtain greater economic benefits, so the system will run closer to its stability. operating point on the boundary, causing the stability level of the system to drop

In the case of sporadic faults or random fluctuations of large-capacity loads in the power grid, the stability of the system can be further reduced. If effective measures are not taken actively to restore the stability of the system, the system will lose stability after a certain subsequent event. , and even cause large-scale power outages

[0004] The traditional production method of "manual experience judgment + online calculation aided decision-making" can no longer meet the complex and changeable dispatching operation requirements of the current power grid

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