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Reliability assessment method for active distribution network when wind power is connected

A technology for active distribution network and wind turbines, which is applied to electrical components, circuit devices, AC network circuits, etc., and can solve the problem that the method of reliability assessment of distribution network is no longer applicable.

Active Publication Date: 2016-08-03
STATE GRID CORP OF CHINA +2
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Problems solved by technology

[0005] Therefore, as a large number of randomly fluctuating distributed power sources are connected to the distribution network, the traditional distribution network reliability assessment method is no longer applicable.

Method used

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  • Reliability assessment method for active distribution network when wind power is connected
  • Reliability assessment method for active distribution network when wind power is connected
  • Reliability assessment method for active distribution network when wind power is connected

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Embodiment Construction

[0054] The method for evaluating the reliability of the active distribution network when wind power generation is connected in the present invention, wherein the structural diagram of the active distribution network is as follows figure 1 As shown, the evaluation method includes the following steps:

[0055] Firstly, a multi-scenario model of wind turbine output is established, including the following steps:

[0056] (1) The probability distribution of the wind speed of the wind farm is represented by the two-parameter Weibull function as follows:

[0057] F(v)=1-exp[-(v / c) k ]

[0058] Among them, c is the scale parameter of the Weibull distribution, k is the shape parameter of the Weibull distribution, and v is the wind speed of the wind farm; the statement Mle(data,'distribution", weibull') in the matlab software returns the scale of the two-parameter Weibull distribution Parameters and shape parameters. Among them, data is the time series of wind speed.

[0059] (2) Th...

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Abstract

The invention relates to an active power distribution network reliability evaluation method during wind power generation access, belonging to the technical field of electric system reliability evaluation. The active power distribution network reliability evaluation method comprises the following steps of: establishing a wind speed probability density function complying with two-parameter Weibull distribution on the basis of historical wind speed data; carrying out bulk sampling on wind speeds by adopting Latin hypercube sampling; establishing a wind speed multi-scene model by adopting a backward scene reducing technology; and establishing a wind power multi-scene model by using the fitting relationship between the wind speeds and the power of an wind power station. In a power distribution network, an island is formed according to planning, and the island forming probability is calculated; and when power generation in the island cannot meet the load requirements, a load excision strategy is formulated according to the importance degree and capacity of the loads, and the probability of cutting each load point and the reliability indexes of the load points are calculated. The active power distribution network reliability evaluation method can be used for effectively and quantitatively evaluating the influence of fan access on the reliability of the power distribution network.

Description

technical field [0001] The invention relates to a method for evaluating the reliability of an active distribution network when wind power generation is connected, and belongs to the technical field of reliability evaluation of distribution networks. Background technique [0002] Facing the pressure of energy shortage and environmental protection, a large number of distributed renewable energy power generation such as wind power and solar power generation began to be connected to the distribution network in large numbers. Wind energy is an environmentally friendly renewable energy with abundant reserves. Wind power generation is an important form of distributed power generation. Its wide access will have a significant impact on the reliability of distribution networks. To study the reliability assessment of the distribution network considering the connection of wind turbines, two technical problems need to be solved: the reliability model of the wind turbine and the reliabili...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02J3/00
Inventor 吴文传郭昆亚张伯明王英男孙宏斌陈璨黄哲洙
Owner STATE GRID CORP OF CHINA
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