Optimized reactive return amount adjusting method for accessing multiple DGs to high-voltage distribution network

Abstract

The invention discloses an optimized reactive return amount adjusting method for accessing multiple DGs to a high-voltage distribution network. The method comprises the steps of: S1, performing reactive balance adjustment for different partitions, wherein multiple DGs exist in the partition A<k>; furthermore, the DGs have the capability of absorbing and sending idle work; the control object of thereactive partition balance is that the return reactive amount delta Q<1> of a 110kV circuit at the power side is reduced preferentially; and then, the active network loss P<loss> in the partition isreduced, so that reactive hierarchical balance is realized in a capacitor excising manner; S2, performing reactive power adjustment sequentially from the farthest partition of the electrical distanceof a first node to the closest partition of the electrical distance, and performing partition adjustment through a reactive adjustment model; and S3, after completing partition adjustment through thereactive adjustment model, according to the reactive return amount Q<1> at the high-voltage side of a 220kV station, on the premise that the 10kV bus V<3> at the low-voltage side of the station does not beyond the lower limit, putting into an electric reactor Q<c> thereof.

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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