Method for calculating voltage distribution of feed line containing DG

Abstract

The present invention relates to a method for calculating voltage distribution of a feed line containing a DG (Distributed Generation), characterized in that calculation of voltage distribution is performed through a superimposed principle, i.e., when a system power supply is in effect and when the DG is in effect, line loss is respectively calculated, then voltage of each node is calculated, and voltage distribution of the feed line is derived. When the plurality of arbitrary DGs are connected, the method also can derive the rule of voltage changes of each node of the feed line. Nowadays, grid connection capacity of the DG is bigger and bigger, the number of the DGs connected in the feed line is correspondingly increased. Therefore, the method can derive the voltage distribution case after the DGs with certain capacity are connected into the feed line, and can derive the optimum position and capacity of the DG when the plurality of DGs are connected into the feed line, thereby solving the problem of node voltage off-limit after connection of the DGs.

Description

technical field [0001] The invention relates to a method for calculating the voltage distribution of feeder lines containing DG, and belongs to the technical field of distribution networks. Background technique [0002] Distributed power generation occupies an important position in the energy field. Its development has alleviated the deterioration of resource scarcity and environmental pollution, and has become one of the ways to effectively utilize renewable energy in nature. In the early stage of development, the connection of distributed power generation does not consider its impact on the distribution network, that is, "connect and forget". However, with the development of distributed power generation technology, the grid-connected capacity is also increasing. The power network has also become complex, from a distribution network with one-way flow of power to an active distribution network with two-way flow, and the impact on the distribution network cannot be ignored. ...

AI Technical Summary

Problems solved by technology

After DG is connected, harmonics will flow into the distribution network, resulting in unqualified power quality. In addition, it will also affect the planning and relay protection of the distribution network.

[0003] In the future, the access of distributed power supply will not only be a single power supply and dual power supply, but will develop in the direction of multi-power supply access, so the circuit will be more complicated

After the distributed power supply is connected to the feeder, the voltage of the node will increase, or even exceed the limit. Reasonable capacity and access location configuration can improve the voltage of the feeder, but unreasonable configuration will easily lead to unbalanced and stable changes in the feeder voltage, and even appear Some node voltages exceed the limit

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