Optimal adjustment method for reactive power return to the network when multiple distributed power sources are connected to high-voltage distribution network

Abstract

The invention discloses a method for optimizing and adjusting the amount of reactive power returned to the network in which multiple distributed power sources are connected to a high-voltage distribution network. The method includes the following steps: S1: adjusting reactive power balance for different partitions, wherein partition A k There are multiple distributed power sources, and the distributed power sources have the ability to absorb and emit reactive power. The control target of reactive power partition balance should be prioritized to reduce the reactive power ΔQ of the 110kV line on the power source side. l , and then reduce the active network loss P in the partition loss , the hierarchical balance of reactive power is realized by removing capacitors; S2: from the partition with the farthest electrical distance of the head-end node to the partition with the closest electrical distance, the reactive power of the power supply is adjusted, and the partition is adjusted through the reactive power adjustment model; S3: After the zone regulation is completed through the reactive power regulation model, according to the reactive power return quantity Q of the high voltage side of the 220kV station 1 , at the 10kV busbar V at the low-voltage side of the guaranteed station 3 On the premise that the lower limit does not occur, put in its reactor Q c middle.

Description

technical field [0001] The invention relates to an adjustment method, in particular to an optimal adjustment method for the amount of reactive power returned to the network when multiple distributed power sources are connected to a high-voltage distribution network. Background technique [0002] During holidays such as the Spring Festival and National Day, the power supply of the 110kV high-voltage distribution network drops sharply, and the overall 110kV is in a light-load state; at the same time, there are many cable lines in the 110kV urban power grid, and its charging power is 15 times that of a 110kV overhead line of the same length. -20 times. These two reasons cause the entire 110kV high-voltage distribution network to send a large amount of reactive power back to the upper 220kV power grid. In order to avoid the difficulty of voltage regulation of the upper power grid caused by reactive power feedback, the provincial power dispatching center will assess the total am...

AI Technical Summary

Problems solved by technology

However, the regional power dispatching center has only reduced the total amount of reactive power returned to the grid by investing in 220kV station reactors, and has not yet fully absorbed the reactive power of a large number of DGs.

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