Dynamic adjustment method of sub-regional power grid structure based on pmu measurement

Abstract

The invention provides a divisional power grid structure dynamic adjustment method based on the actual measurement of a power management unit (PMU). The method comprises the following steps of analyzing the overload situation of a power grid in an off-line way, and making a divisional power grid load transferring loop closing and opening scheme; fitting a PMU mounting point according to the made loop closing and opening scheme, and mounting the PMU; performing on-line pre-tide checking on the loop closing and opening scheme according to the real-time information of the PMU, and if no tide crosses a limit, executing the loop closing and opening scheme, otherwise, adjusting the loop closing and opening scheme in an on-line way; judging whether a loop closing point meets a loop closing condition according to voltage information at two ends of a bus acquired by the PMU in real time, if the loop closing point meets the condition, executing loop closing operation; after the loop closing operation is finished, performing loop opening operation; and performing on-line tide analysis according to system tide acquired by the PMU after the loop opening and closing operation is finished, if a tide crosses the limit, adjusting the loop closing and opening scheme, otherwise, indicating that the loop closing and opening scheme is correct, and ending load transferring. By the divisional power grid structure dynamic adjustment method, the accuracy and the effectiveness of the loop opening and closing operation are greatly improved; and the running safety of a divisional power grid is well guaranteed.

Description

technical field [0001] The invention relates to a method for adjusting the structure of a subregional power grid, in particular to a method for dynamically adjusting the structure of a subregional power grid based on PMU actual measurement. Background technique [0002] With the continuous development of the power system and the construction of a large number of 500kV transmission lines, as well as the continuous formation of the new 500kV-220kV electromagnetic ring network, the electromagnetic ring network has become an important accident hazard that affects the safe and stable operation of the power system. In order to suppress the short-circuit current and increase the reliability of the power grid, the 220kV power grid needs to be operated independently in layers and partitions. There are multiple backup communication channels between the grids in each partition. , the dynamic adjustment of the partition grid structure is becoming more and more frequent. For example, in ...

AI Technical Summary

Problems solved by technology

In recent years, the partitioning methods mainly rely on offline calculations and the experience level of operators, lack of effective guidance, and it is difficult to perform effective online ring combination and solution operations.

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