Power supply capability evaluation method considering difference reliability of active power distribution network

Abstract

A power supply capability evaluation method considering difference reliability of an active power distribution network comprises the step of building a power supply capability evaluation model considering difference reliability of the active power distribution network, wherein a target function of the model is maximum power supply capability of the active power distribution network, the power supply capability of the system comprises a main transformer layer and a medium-voltage network layer, an optimization object of the model is a year load peak accessed to each feeder, and a reliability index is used as a constraint condition. A solution method for a power supply capability evaluation model considering difference reliability of the active power distribution network is given out. The solution method comprises reliability evaluation of the active power distribution network comprising a main transformer and a distributed photovoltaic storage battery and power supply capability optimization calculation by taking a reliability evaluation result as an important constraint. Different reliability demands of different regions can be combined, access of distribution photovoltaic energy storage can be combined, a network can be output, the maximum power supply capability of the whole and difference reliability constraint can be met, the optimization of whole power supply capability and local power supply capability can be achieved, and a support is provided for improving the power supply capability of an existing power distribution network structure.

Description

technical field [0001] The invention relates to a method for evaluating power supply capacity of an active distribution network. In particular, it relates to a method for evaluating the power supply capacity of active distribution networks considering differential reliability for urban distribution network planning. Background technique [0002] The power supply capacity is the maximum load that the power grid can supply under certain safety criteria. With the development of the domestic economy and the rapid expansion of the power distribution system, it is necessary to calculate and evaluate the power supply capacity of the existing power distribution system and plan the power supply capacity in the future. At the same time, the shortage of land resources in urban areas makes it difficult to meet the needs of distribution network expansion. Therefore, how to optimize the power supply capacity of the existing network and release the power supply potential has received mor...

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Problems solved by technology

[0004] However, for the calculation method of distribution system power supply capacity considering the N-1 safety criterion, the power grid is required to rigidly meet the N-1 verification at the peak load moment, but in the actual power grid operation process, the peak load is usually the number of the average load. times and the duration is very short. In order to further tap the power supply potential of the system, a power supply capacity evaluation model considering reliability is proposed. The power supply capacity is maximized with specific reliability indicators as constraints, but it can only be applied to systems without DG and The traditional distribution network of energy storage, and the reliability is considered in the form of overall constraints

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