Distributed power supply credible capacity evaluation method based on power distribution network security domain

Abstract

The invention discloses a distributed power supply credible capacity evaluation method based on a power distribution network security domain, and the method comprises the following steps: S1, determining the installed capacity of a distributed power supply and the capacity upper limit of a power distribution feeder line, and building a distributed power supply output and load priority model; s2, generating a system time sequence operation state; s3, judging the system state at the current moment, and generating a radial topological structure of the power distribution network; s4, verifying the topological structure based on the security domain of the power distribution network, and counting the insufficient power supply quantity caused by the power supply adequacy; s5, calculating a reliability index in the evaluation period based on a sequential Monte Carlo method; s6, performing credible capacity search based on a secant string method to obtain the credible capacity of the distributed power supply; according to the method, for a power distribution network topological structure in a system fault or normal operation state, an operation optimization model based on a static security domain is established, and a reasonable distributed power consumption scheme is rapidly formulated.

Description

Technical field: [0001] The invention is suitable for the field of distributed power supply capacity planning of an active distribution network, and in particular relates to a distributed power supply trusted capacity evaluation method based on the distribution network security domain. Background technique: [0002] More and more distributed wind turbines and photovoltaic equipment are connected to the medium and low voltage distribution network, which can improve the load bearing capacity of the distribution network. However, due to the randomness and intermittency of the output of wind and solar power, the load carrying capacity of renewable energy units of the same capacity is far from that of conventional units. evaluation indicators. From the perspective of power supply reliability, credible capacity can be defined as: under the premise of equal reliability, the system can increase the supply load after the wind and solar power supply is connected. [0003] Experts an...

AI Technical Summary

Problems solved by technology

Traditional power system reliability research assumes that the primary energy supply is sufficient and stable, but as intermittent renewable energy sources such as wind energy and solar energy are connected to the grid on a large scale, this assumption will be difficult to hold

Distributed power is widely connected to the distribution network, making the distribution network into an active network, and the load carrying capacity has been improved. However, this improvement is probabilistic, and it is necessary to develop the power supply capacity of the distribution system after the distributed power is connected. Assessment work, i.e. credible capacity of distributed generation

In addition, when the penetration rate of distributed power is high, the distribution network cannot fully accommodate wind and solar power, and how to formulate a reasonable distributed power consumption plan in the adequacy assessment is a major difficulty

Existing studies often evaluate the trusted capacity of large-scale wind and wind farms, but the decentralized control and multi-point access of distributed power sources are difficult points, and the evaluation methods for the trusted capacity of large-scale wind and wind farms are not fully applicable; in addition, existing research in When evaluating system reliability, we often only consider the lack of power supply caused by system failures, while ignoring the impact of power supply adequacy on reliability.

Images