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Equivalent method suitable for current collection network in internal faults of wind power plant

An internal fault, equivalent method technology, applied in wind power generation, AC network circuits, electrical components, etc., can solve problems such as inability to set fault points

Inactive Publication Date: 2016-05-25
NORTH CHINA ELECTRIC POWER UNIV (BAODING)
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Problems solved by technology

[0006] The purpose of the present invention is to be applicable to the equivalence method of the power collecting network when the internal fault of a wind farm, for the equivalence modeling process of the existing wind farm, the equivalence method to the power collecting network is only applicable to the external fault of the wind farm, When an internal fault occurs in the wind farm, the existing collector network equivalent method cannot set the fault point in the equivalent model

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  • Equivalent method suitable for current collection network in internal faults of wind power plant
  • Equivalent method suitable for current collection network in internal faults of wind power plant
  • Equivalent method suitable for current collection network in internal faults of wind power plant

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Embodiment Construction

[0035] The present invention will be described in detail below with reference to the accompanying drawings and embodiments. It should be noted that the following data are based on actual data of a certain regional power grid and are exemplary.

[0036]The wind farm consists of two 35kV overhead main lines, and each main line contains ten 1.5MW DFIGs. The wind farm is connected to the external grid by a 242 / 35kV step-up transformer T1 and a double-circuit 220kV overhead transmission line. The external grid is a single-unit infinite system. 32km, L3 is 172km. The 35kV overhead main line adopts LGJ185 / 25 conductor, 0.191+j0.4Ω / km, and the distance between two adjacent units is 1km. topology such as figure 2 shown.

[0037] The wind speed input to the wind farm is 11m / s, and the Jensen model is used to calculate the wind speed of each unit. Thrust coefficient 0.8, roughness coefficient 0.075. Calculate the wind speed of each unit as shown in Table 3 (G11-G20 is the same as G...

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Abstract

The invention provides an equivalent method suitable for a current collection network in internal faults of a wind power plant and belongs to the technical field of power system modeling. Aiming at the problems that the equivalent method for the current collection network is only suitable for external faults of the wind power plant in the equivalent modeling process of an existing wind power plant, and the existing equivalent method for the current collection network cannot set a fault point in an equivalent model when the faults appear in the wind power plant, a method for determining the position at which an equivalent unit is connected to the current collection network through nonlinear programming without changing the structure and the parameter of the current collection network is provided. When the internal faults appear at different positions, only a cluster division result and the position at which the equivalent unit is connected to the current collection network need to correspondingly adjust. The method can be applied to equivalent modeling in internal faults and external faults of the wind power plant, so that the equivalent model has a broader application range.

Description

technical field [0001] The invention belongs to the technical field of power system modeling, and in particular relates to an equivalent method suitable for a power collection network when an internal fault occurs in a wind farm, and a processing method for a power collection network in the equivalent modeling of a wind farm. Background technique [0002] The wind farm equivalent model is an important tool for researchers and operators to analyze the power system including wind farms, and it is of great significance to power grid dispatching and safe and stable operation of the power grid. If there is a large error between the simulation results of the wind farm equivalent model and the measurement results of the actual wind farm, when this model is applied to the power system analysis, researchers may draw wrong conclusions, or operation managers may make wrong conclusions. Operations threaten the safety and stability of the power grid, and in severe cases cause regional po...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02J3/38
CPCH02J3/386H02J2203/20Y02E10/76
Inventor 陆飞刘其辉赵亚男宋诗雨
Owner NORTH CHINA ELECTRIC POWER UNIV (BAODING)
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