Calculation method of feeder voltage distribution with dg

A technology of feeder voltage and calculation method, which is applied in the field of distribution network, can solve problems such as unqualified power quality, complex lines, node voltage out of limit, etc., and achieve the effect of solving node voltage out of limit

Inactive Publication Date: 2018-06-19
SHANDONG UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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

Method used

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  • Calculation method of feeder voltage distribution with dg
  • Calculation method of feeder voltage distribution with dg
  • Calculation method of feeder voltage distribution with dg

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Embodiment Construction

[0038] Embodiments of the present invention are further described below in conjunction with accompanying drawings:

[0039] Such as figure 1 and figure 2 As shown, it is assumed that there are n distributed power sources connected to the feeder, and the connected nodes are respectively d 1 、d 2 ... d n Respectively represent the nodes connected by the 1st, 2nd...n DGs, and the access capacity is P d1 ,P d2 ......P dn . After analysis and derivation, the voltage formulas of each node k can be expressed by formulas (1)-(3) respectively.

[0040] When k ∈ [0, d 1 ]Time,

[0041] When k∈[d x , d x+1 ], where d x Indicates the node where the xth DG is located.

[0042]

[0043] When k∈[d n , N],

[0044] Assuming k is any real number on (0, N], then U k Defined as a continuous function on the interval, and in the interval (0, d 1 ), (d x , d x+1 ), (d n , N) means that all nodes except the start and end nodes and distributed power access points can be gu...

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Abstract

The present invention involves a calculation method of the feed line voltage distribution of DG, which is characterized by the use of the voltage distribution calculation using the primary principle, that is, the line loss of the computing system power supply and distributed power supply respectively, and then calculate the voltage of each node.Drive the distribution of feeder voltage.When any multiple distributed power supply access, the algorithm can derive the law of the voltage changes of each node of the feeder.Today, the grid capacity of distributed power supply is getting larger and larger, and the number of connected distributed power supply in the feeder increases accordingly.Therefore, using this algorithm can derive the voltage distribution situation after the distributed power supply is connected at a certain capacity, and then it can derive the best position and capacity of DG during the multi -power supply in the feed line.More limited.

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. ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02J3/38G06Q50/06
Inventor 张新慧梁永省陈羽徐丙垠
Owner SHANDONG UNIV OF TECH
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