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Reliability evaluation method for power distribution network containing distributed power supply

A distributed power and reliability technology, applied in the fields of resources, wind power generation, photovoltaic power generation, etc., can solve problems such as inappropriate research on the reliability of new distribution networks

Pending Publication Date: 2020-11-03
STATE GRID CHONGQING ELECTRIC POWER CO ELECTRIC POWER RES INST +2
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Therefore, traditional reliability analysis methods are not suitable for studying the reliability of new distribution networks, and new models and methods need to be established to analyze

Method used

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  • Reliability evaluation method for power distribution network containing distributed power supply
  • Reliability evaluation method for power distribution network containing distributed power supply
  • Reliability evaluation method for power distribution network containing distributed power supply

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0039] A large number of studies have shown that the output power of wind turbines is closely related to wind speed, and the relationship between the two, that is, the output characteristics of wind power generation, can be approximated by the following piecewise function:

[0040]

[0041] In the formula, P w Indicates the output power of the wind turbine; v is the actual wind speed; P wr is the rated wind power output;, v ci , v r , v co Respectively represent cut-in, rated and cut-out wind speed; a 1 、a 2 is the output parameter, and there are:

[0042]

[0043]

[0044] According to the value of m in the formula, the wind power output characteristic curve can be divided into linear, quadratic and cubic curves. When m=1, there is a linear relationship between wind power output and wind speed, and the calculation amount is small, which is suitable for actual engineering estimation and is widely used. Therefore, in this embodiment, a linear model is selected f...

Embodiment 2

[0113] Using the planned island operation mode, the island formation time is 0.2h. The load of each node obeys the normal distribution, and the standard deviation takes 20% of the expected value. For DG parameter setting, refer to 1.1. Set the rated capacity of the access DG to 2.6MW. The impact of DG faults on load points is not considered in the calculation process.

[0114] In order to study the influence of separate wind power, photovoltaic power generation system and wind-solar hybrid power supply system on the reliability of distribution network, the following four schemes are designed:

[0115] Option 1: Do not add DG;

[0116] Scheme 2: Connect a wind turbine with a rated capacity of 2.6MW to the branch feeder F7;

[0117] Scheme 3: Connect a photovoltaic generator set with a rated capacity of 2.6MW to the branch feeder F7;

[0118] Option 4: Connect a wind-solar hybrid power supply system with a rated capacity of 2.6MW to the branch feeder F7, and the wind power ...

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Abstract

The invention discloses a reliability evaluation method for a power distribution network containing a distributed power supply, and belongs to the technical field of energy optimization. The method comprises the following steps: step 1, constructing a wind power generation probability model and a photovoltaic power generation probability model, and constructing a wind-solar hybrid power supply system joint output probability model by adopting a Copula function theory; 2, calculating a power parameter and a probability parameter under a given parameter condition according to the wind-solar complementary power supply system joint output probability model; 3, calculating a reliability index of each load point of the power distribution network in different distributed power supply access typesand / or positions by adopting an improved sequential Monte Carlo simulation method; and 4, analyzing the reliability index to determine the influence of the access type and / or position of the distributed power supply on the reliability of the power distribution network. According to the method, the reliability of the power distribution network containing the distributed power supply can be betterevaluated by introducing the wind-solar hybrid power supply system joint output probability model and combining with the improved sequential Monte Carlo simulation.

Description

technical field [0001] The invention relates to the technical field of energy optimization, in particular to a method for evaluating the reliability of a distribution network including distributed power sources. Background technique [0002] The proposal of smart grid and the maturity of distributed power generation technology have made it possible for renewable clean energy such as wind energy and solar energy to be widely used in power distribution systems. The application of distributed generation (DG) such as wind power and photovoltaics can not only alleviate the energy crisis and reduce environmental pollution, but also meet the load growth demand of the power grid. However, the access of DG will affect the structure and operation mode of the power grid. Most of the traditional distribution network is radial, and the load points in the system have a unique path to obtain electric energy. Once the feeder fails, it may cause power outages at all load points behind the f...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G06Q10/06G06Q50/06H02J3/00H02J3/38
CPCG06Q10/06393G06Q50/06H02J3/00H02J3/381H02J2203/10H02J2203/20H02J2300/24H02J2300/28H02J2300/40Y02E10/56Y02E10/76
Inventor 赵小娟余佩谢刚文张友强宋伟朱小军王瑞妙宫林杨爽
Owner STATE GRID CHONGQING ELECTRIC POWER CO ELECTRIC POWER RES INST
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