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Island dividing method considering distributed power output and load uncertainty

A distributed power supply and island division technology, which is applied in the direction of instruments, data processing applications, forecasting, etc., can solve the problems that the island division scheme cannot take into account the reliability and economy of power supply, the uncertainty of DG output load demand, and the model is too simple

Inactive Publication Date: 2015-11-18
TONGJI UNIV
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Problems solved by technology

Since this type of method does not consider the fluctuation of distributed power output and the uncertainty of load demand, the island division scheme obtained by this type of method cannot take into account the reliability and economy of power supply, and is only an approximate scheme.
[0005] The second type of method takes into account the fluctuation of DG output and the uncertainty of load demand
Although this method considers the randomness of wind power output, it does not consider the uncertainty of load demand and the optimization of network structure, and the model is too simple

Method used

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  • Island dividing method considering distributed power output and load uncertainty
  • Island dividing method considering distributed power output and load uncertainty
  • Island dividing method considering distributed power output and load uncertainty

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Embodiment

[0085] Such as figure 1 As shown, the figure is a diagram of the thought steps of island partitioning and solving considering uncertainty, such as figure 2 As shown, the figure is a flowchart of the method of the present invention, according to figure 1 with 2 The ideas and methods shown are illustrated by examples.

[0086] For the distribution network system, the load model of the present invention considers the following characteristics: (1) Load importance, that is, it is divided into first-level load, second-level load, and third-level load, and attaches different weight coefficients to each load. i ; (2) Load controllability, if node L is connected to load P L The proportions of controllable and uncontrollable loads are a and b respectively (a+b=1; a≥0, b≥0), if a> 0, set an additional node to connect to node L through a branch with a switch, and its load value is aP L , Its load importance level is the same as that of node L, and the load directly carried by node L becomes...

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Abstract

The invention relates to an island dividing method considering distributed power output and load uncertainty. The island dividing method comprises the following steps that 1) a random variable sequence formed by distributed power supplies and loads is set; 2) an initial sampling matrix Z0 is constructed through K random variables in the random variable sequence; 3) an effective sampling matrix Z is obtained via rearrangement; 4) an optimal island dividing model considering the DG output and load requirement is established, and the model is solved so that N island sets ISi are obtained, and an initial total island set U0 is formed by the N island sets; 5) the sets of combination of non-repetitive distributed power supplies are confirmed in the initial total island set U0; 6) an initial island set U including DG and load nodes is obtained; 7) the initial island set U is combined and adjusted; and 8) reconstruction, safety verification and adjustment are performed on the initial islands. Compared with methods in the prior art, the island dividing method has advantages of being comprehensive and complete in consideration and easy to popularize and use.

Description

Technical field [0001] The invention relates to a method for dividing an island, in particular to a method for dividing an island considering the uncertainty of distributed power output and load. Background technique [0002] With the increase in energy conservation and emission reduction efforts, the penetration rate of various distributed generation (DG) based on renewable energy in the distribution network is getting higher and higher. Since distributed power sources have the ability to supply power independently, after the power outage of the distribution network due to a fault, if the independent and fast power supply capability of DG (ie island operation capability) can be fully utilized, the non-faulty network and the rapid recovery of important loads in the power outage area can be realized. Power supply is of great significance for improving the power supply reliability of the distribution network and reducing power outage losses. [0003] Regarding how to make full use o...

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Application Information

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IPC IPC(8): H02J3/38G06Q10/04G06Q50/06
Inventor 林济铿李飞刘阳升刘慧杰王忠岳张鑫
Owner TONGJI UNIV
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