Power distribution network transformer planning method considering uncertainty of photovoltaic power generation output and total life cycle cost

Abstract

The invention provides a power distribution network transformer planning method considering uncertainty of photovoltaic power generation output and a total life cycle cost, and belongs to the field of power distribution network planning. The power distribution network transformer planning method comprises the following steps: firstly providing a power distribution network transformer risk constant volume method based on the opportunity constraint theory by considering the output uncertainty of distributed photovoltaic power generation; calculating a distribution network probability trend after the access of the distributed photovoltaic power generation by using a three-point estimation method on this basis, meanwhile constructing a target function based on the total life cycle cost, and finally providing an uncertain power distribution network transformer planning model based on the total life cycle theory. An example simulation result indicates that, compared with the traditional deterministic power distribution network transformer planning method, the method provided by the invention has the advantages that all costs within a total life cycle of the equipment are accurately measured, the influence of the uncertainty of the distributed power supply to the constant volume and model selection of the equipment is accurately calculated, and the limits of the constant volume and model selection of the power distribution network transformer are compensated, thereby effectively improving the economical efficiency of the power distribution network transformer planning, and the method provided by the invention is more scientific.

Description

technical field [0001] The invention relates to a distribution network transformer planning method that takes into account the uncertainty of photovoltaic output and the cost of the whole life cycle, and belongs to the field of distribution network planning including distributed generation (DG). Background technique [0002] In recent years, with the aggravation of environmental pollution and energy shortage, distributed power generation technology has been paid more and more attention. In the distribution network, the penetration rate of distributed power, especially distributed photovoltaic generation (PVG) is growing rapidly. In this context, how to make scientific investment decisions for power equipment and build a reliable and economical distribution network It is a research hotspot in the field of planning at present. [0003] Distribution transformer (distribution transformer) is an important power equipment in the distribution network. It has a large amount of use,...

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Problems solved by technology

At the same time, the study found that although the accurate evaluation of the distribution transformer LCC cost has been realized in the current distribution transformer planning, there are still some problems: on the one hand, the influence of uncertain factors in the distribution network is not considered in the planning, and with the A large number of distributed power sources are connected to the distribution network, and the uncertain influence factors in the distribution network planning process are further increased. This kind of distribution transformation planning based on deterministic LCC cost has been used because it cannot accurately evaluate the influence of uncertain factors. It is difficult to meet the actual needs of the existing distributed power distribution network planning; on the other hand, at present, most of them only focus on the selection of distribution transformers with fixed capacity. In the planning process, the capacity and selection of distribution transformers are separated Calculations are performed separately for two independent problems, which may ignore the former's internal influence on the selection of distribution transformers, thereby affecting the calculation accuracy of the planning model

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