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A method for evaluating the probability of voltage unbalance in distribution network with distributed generation

A voltage unbalanced and distributed power supply technology, applied in data processing applications, instruments, calculations, etc., can solve problems such as large calculation errors and errors, and achieve the effect of avoiding calculation errors

Active Publication Date: 2021-01-08
CHINA ELECTRIC POWER RES INST +3
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  • Abstract
  • Description
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Problems solved by technology

When the relationship between random variables is nonlinear, using the correlation coefficient to represent the independence between random variables will bring large calculation errors and even draw wrong conclusions

Method used

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  • A method for evaluating the probability of voltage unbalance in distribution network with distributed generation
  • A method for evaluating the probability of voltage unbalance in distribution network with distributed generation
  • A method for evaluating the probability of voltage unbalance in distribution network with distributed generation

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Embodiment Construction

[0067] The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, but not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without making creative efforts fall within the protection scope of the present invention.

[0068] like figure 1 As shown, the present invention provides a method for evaluating the probability of voltage unbalance in a distribution network containing distributed power sources. The distribution network includes a distributed power generation system; the distributed power generation system is a wind power generation system, a photovoltaic power generation system or a wind-solar combined power generation system; The method ...

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Abstract

The invention provides a voltage imbalance probability evaluation method for a power distribution network containing distributed generation. The method comprises the steps of firstly analyzing correlated characteristics among various types of DG (Distributed Generation), building different Copula models to simulate output data of the DG, and finally performing evaluation on a voltage unbalance factor of the power distribution network based on a Latin hypercube sampling Monte Carlo simulation (LHS-MCS) method, thereby acquiring influences imposed on the power distribution network by different correlated characteristics of various types of DG. The voltage imbalance probability evaluation method can accurately describe different nonlinear features of the DG, thereby avoiding occurrence of a large calculation error; and the method can accurately evaluate influences imposed on voltage imbalance of the power distribution network by the DG, thereby having positive significance for distributed generation planning and power distributed network running.

Description

technical field [0001] The invention relates to a method for evaluating the power quality of a distribution network with distributed power sources in a power system, in particular to a method for evaluating the probability of voltage unbalance in a distribution network with distributed power sources. Background technique [0002] There are a large number of single-phase loads, two-phase loads, and three-phase unbalanced loads in the distribution network. Although operators can try their best to arrange a large number of single-phase loads evenly on the three-phase lines to maintain the overall three-phase balance according to the actual situation, due to the diversity, non-simultaneity and asymmetry of the loads, the distribution network is often in Unbalanced multi-phase operation state, at this time, a large number of negative sequence components contained in the system will have many adverse effects on electrical equipment, such as causing additional heat and vibration of...

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G06Q50/06
CPCY04S10/50
Inventor 李伟白晓民董伟杰盛万兴刘科研刁赢龙孟晓丽
Owner CHINA ELECTRIC POWER RES INST
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