On-line evaluation method and device for dynamic performance of thermal power plant excitation system in multiple scenes

Abstract

The invention provides an on-line evaluation method and device for a dynamic performance of a thermal power plant excitation system in multiple scenes. A three-phase terminal voltage of a thermal power generating unit is obtained by a wide area monitoring system and a positive sequence voltage of the thermal power generating unit is calculated; a working system of an excitation system of the thermal power generating unit is analyzed and whether the excitation system of the thermal power generating unit is in an abnormal working state is determined; and a dynamic performance evaluation index of the abnormal working state of the excitation system of the thermal power generating unit is calculated and on-line evaluation is carried out on the dynamic performance of the excitation system of the thermal power generating unit. Besides, on-line evaluation is carried out on a damping characteristic of the excitation system of the thermal power generating unit during a low-frequency oscillation process and a motion performance of an excitation limiter of the excitation system of the thermal power generating unit and on-line identification and trouble shooting are carried out a generator set with an abnormal operating state or a difference with an expected response, and thus the poor dynamic performance of the generator set can be discriminated timely, so that secure and stable operation of the grid can be guaranteed effectively.

Description

technical field [0001] The invention relates to an online evaluation technology, in particular to an online evaluation method and device for the dynamic performance of the excitation system of a thermal power unit under multiple scenarios. Background technique [0002] In the modern large power grid, with the continuous improvement of the interconnection degree of the power network, the system becomes larger and larger, and the operation mode becomes more and more complex. Each area and each part are interconnected, closely related, and interact with each other during operation to ensure system security. The difficulty of reliable operation is also increasing, making the security and stability of the power grid more and more prominent. [0003] Power system stability is the fundamental problem of power system. Security and stability issues have become the most prominent issues that need to be carefully resolved in the process of developing large-scale power systems. [000...

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Problems solved by technology

[0006] At the same time, the selection of the specific dynamic adjustment time period for thermal power units depends entirely on personal experience, and the evaluation results largely depend on personal familiarity with the excitation system and work experience, and the evaluation indicators are relatively single and cannot be real-time. , Comprehensive response to the dynamic performance of the excitation system of thermal power units

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