A Method for Improving Voltage Quality of Distribution Network Containing Small Hydropower

Abstract

The embodiment of the invention discloses a method for improving the voltage quality of a small hydropower distribution network. The method comprises steps of: acquiring a to-be-selected line of a capacitor, the number of the to-be-selected line, and a maximum capacitive reactance value corresponding to the to-be-selected line; forming an initial group according to the number of the to-be-selected line and the maximum capacitive reactance value; computing the objective function values of individuals in the initial group; and determining the installation position and capacitive reactance value of the capacitor according to the objective function values. The method may accurately determine the installation position and the compensation capacitive reactance value of the series compensation capacitor, is more accurate than a conventional computational method, and achieves a better capacitor compensation effect and higher voltage quality improvement in the small hydropower distribution network. Further, the method caters to the minimum annual cost of investment and operation of the installation of the series capacitor in the small hydropower distribution network. Therefore, the distribution network is safe, high in quality, and economical in operation.

Description

technical field [0001] The invention relates to the technical field of distribution networks, in particular to a method for improving the voltage quality of a distribution network containing small hydropower by using series capacitors. Background technique [0002] Small hydropower is a renewable green energy source, which is generally distributed in remote rural areas. It has the characteristics of scattered distribution along rivers, power supply in patches, and integration into 10kV or 35kV distribution networks nearby. In the wet season, the small hydropower supply area with a total installed capacity of a certain scale may need to transmit power to the external grid because it cannot achieve local power balance. This operation mode changes the power flow distribution of the distribution network and leads to excessive line voltage; In the dry season, since most run-of-river hydropower stations do not generate electricity, the voltage of the end users of the long lines po...

AI Technical Summary

Problems solved by technology

The main disadvantages of this method are: ① This method uses 1 / 3 to 1 / 2 of the voltage difference of the whole line at the maximum load to determine the position of installing series capacitors in a line with multiple branch lines, but it does not give 1 / 2 of the voltage difference of the whole line How to select a specific location in / 3~1 / 2

② This method cannot obtain the best installation position and capacitive reactance of series capacitors

③This method only considers the site selection and fixed capacity of series capacitors from the aspect of improving voltage quality, and does not consider the installation position and capacitance reactance of series capacitors from the aspect of economy

Therefore, the existing methods cannot obtain the optimization scheme for the installation position and capacitive reactance of series capacitors in distribution networks containing small hydropower, and cannot effectively use series capacitors to achieve safe, high-quality and economical operation of distribution networks containing small hydropower

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