Double-layer voltage regulation method for power distribution network

Abstract

The invention discloses a double-layer voltage regulation method for a power distribution network, and the method comprises the specific steps: A, building a topological model of the power distribution network based on the lead information of a corresponding power distribution network; b, reactive voltage sensitivity of nodes is calculated, and the power distribution network is partitioned; c, determining a gear plan of an on-load voltage regulating transformer and a switchable capacitor bank by taking network loss reduction as a target in the day, and determining a reactive power output plan of an SVG, a photovoltaic power station and an energy storage power station by taking voltage optimization as a target; d, determining the priority sequence of the distributed photovoltaic equipment and the distributed energy storage equipment participating in voltage regulation within the day; and E, according to the subarea to which the voltage out-of-limit node belongs and the out-of-limit value, carrying out post adjustment on the voltage of the power distribution network. According to the voltage regulation strategy provided by the invention, day-ahead scheduling optimization and intra-day post-event regulation are matched, traditional voltage regulation equipment is coordinated, the supporting capability of distributed optical storage equipment which cannot participate in optimization scheduling on the voltage is mined, and the effects of improving power grid voltage out-of-limit and reducing network loss on the power grid are achieved.

Description

technical field [0001] The invention relates to the technical field of smart grids, in particular to a double-layer voltage regulation method for distribution networks. Background technique [0002] With the maturity of technology and the requirements of energy transformation, more and more photovoltaic power plants are connected to the distribution network. Photovoltaic output is highly volatile due to environmental factors, which causes corresponding fluctuations in voltage at and near photovoltaic grid-connected points. In addition, the characteristics of photovoltaic output and load peaks and valleys are different, and the reverse power flow breaks the radial power flow distribution of the original distribution network, which in turn will cause the corresponding voltage limit problem, thus posing a great challenge to the voltage stability of the distribution network. The current voltage regulation device and method cannot meet the voltage regulation requirements under l...

AI Technical Summary

Problems solved by technology

However, at present, most of the small distributed photovoltaic and distributed energy storage do not have the ability to participate in the centralized dispatching of the power grid

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