A reliability assessment method for distribution network consisting of photovoltaic power generation microgrid

A technology for photovoltaic power generation and distribution network, which is applied in the field of electric power and can solve the problems of not considering the influence of the reliability of the power supply and distribution network.

Inactive Publication Date: 2019-04-09
CHINA AGRI UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The difficulty of evaluating the reliability of distributed power generation after it is connected to the distribution network lies in matching the sequential power output of distributed power generation with system load changes; It has gradually changed from the previous single-radiation form to the form of multi-segmentation and multi-connection, and the existing research basically does not consider the impact of transfer (connection line) on the reliability of the distribution network when calculating the reliability index

Method used

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  • A reliability assessment method for distribution network consisting of photovoltaic power generation microgrid
  • A reliability assessment method for distribution network consisting of photovoltaic power generation microgrid
  • A reliability assessment method for distribution network consisting of photovoltaic power generation microgrid

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Embodiment

[0164] This embodiment includes a 10kV power distribution line in a certain area in northern my country, and its grid structure is as follows figure 2 As shown, there are 3 forwarding peers in this line; after simplification, the simplified topology diagram is as follows Figure 3a shown.

[0165] The distribution network includes 49 nodes (node ​​0 to node 48), 24 distribution transformers (T1 to T24), 24 load points (LP1 to LP24) and 24 connecting lines (L1 to L24). Figure 3a L1~L11 in the middle form the main feeder line of the distribution network, and the branches formed by the other lines or distribution transformers are all branch lines, and the distribution transformer is marked with the name of the transformer, rated capacity (kVA) and the number of users , For example, T1(315 / 2) means: the rated capacity of the distribution transformer T1 is 315kVA, and the transformer supplies power to 2 households. The total distribution transformer capacity in the distribution...

Embodiment 1

[0167] The daily maximum load variation curve in one year of the embodiment is as follows Figure 4 As shown in Table 1, according to the typical daily load rate statistical table in this area, the typical daily load rate change curve is obtained; the distribution network is obtained by fitting the daily maximum load change curve and the typical daily load rate change curve in a year The hourly load change curve of each load point in a year, such as Figure 5 shown.

[0168] Table 1 Typical daily load rate statistics table of the embodiment

[0169]

[0170] The load change of each load point should be similar to the load change of the entire 10kV distribution line. Considering here for simplicity, the shape of the load curve of each load point is the same as that of the total load curve, and the amplitude is based on the distribution transformer installed at each load point. Ratio distribution of total distribution transformer capacity.

[0171] Step 2, establishing the...

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Abstract

The invention belongs to the technical field of electric power, and relates to a reliability evaluation method for a power distribution network containing a microgrid formed by photovoltaic power generation. The method comprises the steps of building an hourly load changing curve over the year of each load point in the power distribution network; building an hourly output power curve over the year of photovoltaic power generation in the power distribution network; determining the maximum power supply range of photovoltaic power generation and the maximum power supply range of a transferring opposite terminal; solving the probability of being powered by photovoltaic power generation of each load point in the maximum power supply range of photovoltaic power generation; searching the load points; solving the minimum path of each load point, and recording equipment on the minimum path and a non-minimum path of each load point respectively; determining the contribution of the equipment failure rate and the failure time of the equipment on the minimum path and the non-minimum path of each load point for a reliability index of each load point; calculating the reliability index of each load point; and calculating a reliability index of the power distribution network system. A photovoltaic power generation model built by adopting the method provided by the invention is small in required data volume and high in precision, and is more suitable for actual circumstances.

Description

technical field [0001] The invention belongs to the technical field of electric power, and in particular relates to a method for evaluating the reliability of a distribution network comprising a micro-grid composed of photovoltaic power generation. Background technique [0002] The access of renewable energy to the distribution network in the form of distributed power is an effective means to reduce energy pressure and protect the environment in our country, and it is very common for distributed power to connect to the distribution network in our country. Photovoltaic power generation has relatively great potential for development, but it is strongly restricted by the environment and has intermittent and random characteristics. The access of distributed power to the distribution network will affect the power flow distribution, protection control, harmonics, stability and other aspects of the distribution network. When the penetration rate of distributed power is low, these ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G06Q10/06G06Q50/06
CPCG06Q10/0637G06Q50/06
Inventor 杨建华周长城朱雪飞史玉洁袁泽
Owner CHINA AGRI UNIV
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