Method and device for determining accepting ability of medium and lower voltage distribution network to distributed power sources

Abstract

The application discloses a method for determining accepting ability of a medium and lower voltage distribution network to distributed power sources. The method comprises the following steps: determining an installed capacity of each distributed power source in each category distribution network according to a current permitted permeability; calculating node voltage and / or short-circuit current according to the installed capacities, and then performing checking; when the node voltage and / or the short-circuit current is larger than a preset threshold, determining whether a difference value between a current permitted permeability and a former permitted permeability is in a default range or not, if not, updating current permitted permeability in low direction, and if yes, updating current permitted permeability in high direction; when the node voltage and / or the short-circuit current is not larger than the preset threshold, updating current permitted permeability in high direction, using the updated current permitted permeability as a new permitted permeability, and then returning the step for determining the installed capacity; determining the accepting ability of the medium and lower voltage distribution network to the distributed power sources according to final permitted permeability. The application further discloses a device for determining the accepting ability of the medium and lower voltage distribution network to the distributed power sources. According to the application, an actual situation of the access capability of the distributed power sources can be accurately reflected.

Description

technical field [0001] The present application relates to the technical field of power system analysis, and in particular to a method for determining the ability of a medium- and low-voltage distribution network to accept distributed power sources and a corresponding device. Background technique [0002] In order to alleviate the tension of power supply to loads, an effective way is to connect distributed power sources to the existing medium and low voltage distribution network, and the distributed power sources connected to the medium and low voltage distribution network will directly supply power to the loads to realize electric energy Local consumption, this method is beneficial to reduce the power flow in the distribution network, reduce the loss of the power grid, improve the reliability of power supply for important users, and solve the problem of power supply in remote areas such as rural areas or isolated islands. However, due to the access of distributed power gener...

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Problems solved by technology

[0003] The existing technology usually adopts the method of data verification to determine the ability of the medium and low voltage distribution network to accept distributed power sources. However, this method has limitations: on the one hand, the verification criteria based on data verification have complex and diverse shortcomings, and With the development of power system technology and form, some verification criteria can no longer adapt to medium and low voltage distribution networks. The nuclear judgments are equally used to complete the data verification, and some verification criteria have little effect on determining the ability of the distribution network to accept distributed power sources, and are not the key limiting factors that need to be considered, for example, the influence of harmonics

It can be seen that when the existing technology determines the ability of the medium and low voltage distribution network to accept distributed power, due to the use of untimely or non-key check criteria, it will be difficult to accurately reflect the determined ability to accept distributed power. The actual situation of distributed power access

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