Constant volume method of urban power grid multi-partition flexible interconnection converter station

Abstract

The invention discloses a constant volume method of an urban power grid multi-partition flexible interconnection converter station, which specifically comprises the following steps: firstly, proposing a definition of the maximum power supply capability of an interconnected partition 220kV power grid, and establishing an interconnected power grid power supply capability evaluation mathematical model; secondly, adopting the improved K-means clustering to obtain the typical load level of the interconnection partition, and improving the precision of solving the power supply capability by the successive approximation method; and finally, determining the active capacity of the converter station by taking the purposes of achieving the maximum power supply capacity of the interconnected partitions and eliminating the overload of partition elements as targets. The influence of the load proportion of an induction motor in a load model on the reactive capacity of the converter station is considered, and the reactive capacity of the converter station is determined with the purpose that the bus voltage recovers to the specified level after the transient fault occurs in the partition. The constant volume method can meet the requirements that an interconnected city power grid reaches the maximum power supply capacity and the reactive power requirements of induction motors with different proportions under transient faults.

Description

technical field [0001] The invention relates to a method for constant capacity of a multi-zone flexible interconnection converter station in an urban power grid, which belongs to the field of power system planning. Background technique [0002] At present, the large-scale urban AC power grid has basically built a grid structure with 500kV double-ring network as the backbone and 220kV partitioned operation. While meeting the safe power supply requirements of the urban power grid, the grid structure also has some safety problems: ① The electromagnetic ring network de-looping measures aiming at suppressing the short-circuit current exceeding the standard reduce the reliability of power supply in the districts; For generator sets, the ability to control voltage and reactive power is reduced; ③The shortage of land resources makes it difficult to increase the capacity of power supply equipment and power transmission channels. The flexible DC transmission technology based on volta...

AI Technical Summary

Problems solved by technology

While meeting the safe power supply requirements of the urban power grid, the grid structure also has some safety problems: ① The electromagnetic ring network de-looping measures aiming at suppressing the short-circuit current exceeding the standard reduce the reliability of power supply in the districts; Generator sets, the ability to control voltage and reactive power is reduced; ③The shortage of land resources makes it difficult to increase the capacity of power supply equipment and power transmission channels

In addition, the reactive power constant capacity method of the existing converter station ignores the proportion of the induction motor in the load model

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