Method for quickly evaluating distributed power supply plug-and-play access capacity

Abstract

The invention provides a method for quickly evaluating the distributed power supply plug-and-play access capacity. A double-layer optimization model for calculating the maximum access capacity of a distributed power supply considering multiple factors such as voltage deviation, static safety and stability margin, power flow and the like is constructed, and the model is solved by adopting a trust region sequential quadratic programming method. A large amount of interval calculation is adopted, and the uncertainty of loads is considered. Compared with a traditional access capacity calculation method for determining the installation positions and the access number of distributed power supplies, the maximum access capacity of a power distribution network can be calculated when the positions, the number and the capacity of distributed power supplies are unknown, and comprehensive evaluation of the capability of accepting distributed power supplies by the power distribution network is realized by considering multiple factors such as voltage deviation, static safety and stability and the like. Compared with a conventional method in which the positions of distributed power supplies are determined and the load is only processed as a determined value, the method is more suitable for rapid evaluation of the distributed power supply plug-and-play access capacity.

Description

technical field [0001] The invention relates to the field of distributed power supply and distribution network, in particular to a method for quickly evaluating the plug-and-play access capacity of distributed power supply. Background technique [0002] The access of distributed power generation has brought a series of impacts on the operation of power distribution network. On the one hand, it can improve the quality of network voltage and reduce network loss; on the other hand, when the penetration rate of distributed power generation is high, it may affect safe operation of the network. For the calculation of the penetration rate of distributed generation into the distribution network, traditional research mainly focuses on the maximum access capacity of distributed generation that can be connected to the network under the given distributed generation access point and access number. This is an optimal planning problem. What is solved is the optimal access mode of distribu...

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Problems solved by technology

However, from the perspective of the distribution network, under the maximum access capacity solved, when the location and capacity of the distributed power supply change, it cannot be guaranteed that the network constraints will not exceed the limit

[0003] Therefore, when the location, quantity, and capacity of distributed power sources are unknown, the model and method described above cannot be used to evaluate the maximum capacity of distributed power sources that can be accommodated by the distribution network.

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