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Power distribution network single photovoltaic digestion capability evaluation method in consideration of voltage out-of -limit risk

A technology of voltage over-limit and absorbing capacity, which is applied in the field of assessment of the absorbing capacity of distributed power in distribution network

Active Publication Date: 2018-06-29
HEYUAN POWER SUPPLY BUREAU GUANGDONG POWER GRID CO LTD
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0002] The access of a large number of distributed photovoltaics makes the original single power supply radiation distribution network into an active distribution network, which changes the power flow and voltage distribution of the distribution network and also increases the risk of voltage over-limit

Method used

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  • Power distribution network single photovoltaic digestion capability evaluation method in consideration of voltage out-of -limit risk
  • Power distribution network single photovoltaic digestion capability evaluation method in consideration of voltage out-of -limit risk
  • Power distribution network single photovoltaic digestion capability evaluation method in consideration of voltage out-of -limit risk

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Embodiment

[0111] The embodiment of the present invention adopts the improved IEEE33 node power distribution system as a simulation case, as shown in the attached figure 2 The 10kV linear LGJ-240 commonly used in China is selected as the backbone line, node 1 is a balanced node, the voltage is set to 1.05p.u., and the system equivalent reactance Xs is 0.32Ω, assuming that the distributed photovoltaic equivalent concentration At the 19 nodes at the end of the access system, the parameters of the trunk and branch lines used in the simulation are shown in Table 1. In this embodiment, the load characteristics of different load types are different, and the daily load curves of each load type are as attached image 3 Show.

[0112] Table 1 Line parameters

[0113]

[0114] In order to study the photovoltaic limit access capacity of the distribution network under different load characteristics and line lengths, based on the attached figure 2 Distribution network structure, assuming that...

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Abstract

The invention relates to a power distribution network single photovoltaic digestion capability evaluation method in consideration of voltage out-of -limit risk, which comprises the following steps: (1) the parameter information of a target power distribution network is acquired; (2) a N<d>-day historical load data sample of each distribution transformer of the target power distribution network iscollected, and with the distribution transformer as a unit, a load time sequence model based on multi-parameter normal distribution is created; (3) a N-day historical output data sample of a photovoltaic power station of a target region is collected, and a photovoltaic relative output time sequence model based on multi-parameter beta distribution is established; (4) according to the load time sequence model based on multi-parameter normal distribution and the photovoltaic relative output time sequence model based on multi-parameter beta distribution, a semi-invariant-based probabilistic load flow method is adopted to calculate a voltage out-of -limit risk evaluation index; (5) a voltage out-of -limit risk limit Rvs_limit is set, and a mixed approximation method is adopted to evaluate the photovoltaic digestion capability of the power distribution network. The method takes the time sequence and uncertainty of distributed loads and photovoltaic output into full consideration, and by quantitatively evaluating the voltage out-of -limit risk of the power distribution network, the method provides a reference for the evaluation of the capacity of the photovoltaic-connected power distribution network.

Description

technical field [0001] The present invention relates to a method for evaluating the capacity of a distribution network to accommodate distributed power sources, and more specifically, to a method for evaluating the capacity of a single photovoltaic power distribution network that considers the risk of voltage overrun. Background technique [0002] The access of a large number of distributed photovoltaics makes the original single power supply radiation distribution network into an active distribution network, which changes the power flow and voltage distribution of the distribution network and also increases the risk of voltage over-limit. Due to the uncertainty of photovoltaic output and the timing correlation with loads, it is difficult to accurately measure the degree of influence on the distribution network voltage by the evaluation method based on the determination of power flow, and the degree of influence is mainly related to the location and connection of photovoltaic...

Claims

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Application Information

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IPC IPC(8): H02J3/38H02J3/46H02J3/06G06Q10/06
CPCG06Q10/0635G06Q10/06393H02J3/06H02J3/383H02J3/46H02J2203/20Y02E10/56
Inventor 钟运平陶飞达杨夏黄智鹏王东芳熊洽黄祖委
Owner HEYUAN POWER SUPPLY BUREAU GUANGDONG POWER GRID CO LTD
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