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Dynamic equivalence method for large-scale photovoltaic power station grid connection

A photovoltaic power station, dynamic equivalent technology, applied in the direction of photovoltaic power station, photovoltaic power generation, photovoltaic modules, etc., can solve problems such as difficult to unify, unequal input light intensity, photovoltaic power station equivalence problems, etc., to prevent local overheating, Effect of preventing reverse current

Active Publication Date: 2014-04-16
NARI TECH CO LTD +1
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Problems solved by technology

[0007] Under non-uniform lighting conditions, the input light intensity of each photovoltaic array in the photovoltaic grid-connected power generation unit is not equal, and it is difficult to unify, and the equivalent value problem of photovoltaic power plants will encounter obstacles

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  • Dynamic equivalence method for large-scale photovoltaic power station grid connection
  • Dynamic equivalence method for large-scale photovoltaic power station grid connection
  • Dynamic equivalence method for large-scale photovoltaic power station grid connection

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Embodiment Construction

[0096] The present invention will be described in further detail below with reference to the accompanying drawings and examples.

[0097] For the equivalence problem of large-scale photovoltaic power plants centralized access to the power grid, the present invention mainly aims at the problem of non-uniform light intensity, and proposes an equivalence scheme: first calculate the equivalent uniformity of each photovoltaic grid-connected power generation unit under non-uniform light conditions Input the light intensity; then group the photovoltaic grid-connected power generation units according to the equivalent uniform input light intensity, and the photovoltaic grid-connected power generation units in the same group will be aggregated into a grid-connected power generation equivalent unit (referred to as the equivalent unit); finally calculate each The equivalent input light intensity of equivalence units. The basic assumptions are:

[0098] (1) In the process of equivalent c...

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Abstract

The invention discloses a dynamic equivalence method for large-scale photovoltaic power station grid connection, and belongs to the technical field of electric system control. The method comprises the steps of firstly, calculating the equivalent and uniform input illumination intensity of each grid-connected photovoltaic power generation unit under the non-uniform illumination condition, then, grouping the grid-connected photovoltaic power generation units according to the equivalent and uniform input illumination intensity, aggregating the grid-connected photovoltaic power generation units in the same group into one grid-connected power generation equivalence unit, and finally calculating the equivalent input illumination intensity of each equivalence unit. According to the dynamic equivalence method for large-scale photovoltaic power station grid connection, the dynamic equivalence problem of the large-scale photovoltaic power station grid connection is solved, the number of orders of a model is remarkably reduced, the simulation time is shortened, and meanwhile the influence of a photovoltaic power station on a system can be correctly reflected.

Description

technical field [0001] The invention belongs to the technical field of power system control, and more precisely, the invention relates to an equivalent method for centralized access of large-scale photovoltaic power stations to a power grid. Background technique [0002] Photovoltaic power generation system has become an important form of energy development because of its advantages of safety and reliability, zero emission, no noise, large scale, flexible small components, and basically not restricted by geographical conditions. As more and more large-scale photovoltaic power plants are connected to the grid, it is necessary to carry out in-depth research on the impact of large-scale photovoltaic power plants connected to the grid. There are a large number of photovoltaic grid-connected power generation units in a photovoltaic power station. If each unit is modeled in detail, the number of equations will increase significantly, and the simulation time will be too long; and t...

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Application Information

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IPC IPC(8): H02J3/38H02S10/00
CPCY02E10/563Y02E10/56
Inventor 孟昭军薛峰李威宋晓芳常康方勇杰崔晓丹许晓彤王海潮
Owner NARI TECH CO LTD
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