Online evaluation method and device for dynamic performance of thermal power unit excitation system under multiple scenarios

Abstract

The present invention provides an online evaluation method and device for the dynamic performance of the thermal power unit excitation system in multiple scenarios. According to the wide-area monitoring system, the three-phase terminal voltage of the thermal power unit is obtained, and the positive sequence voltage of the thermal power unit is calculated; the working state of the thermal power unit excitation system is analyzed, Judging whether the excitation system of the thermal power unit is in an abnormal working state; calculating the dynamic performance evaluation index of the abnormal working state of the excitation system of the thermal power unit, and performing an online evaluation of the dynamic performance of the excitation system of the thermal power unit. The present invention also conducts online evaluation on the damping characteristics of the excitation system of the thermal power unit during the low-frequency oscillation process and the action performance of the excitation limiter of the excitation system of the thermal power unit, and identifies and checks out the generating units with abnormal operating status or differences from the expected response on-line, and promptly identifies them. The poor dynamic performance of the generating set can more effectively guarantee the safe and stable operation of the power grid.

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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