Equivalent simulation method for grid-connected photovoltaic power generation system

A photovoltaic power generation system and equivalent simulation technology, applied in the field of electric power, can solve the problems of difficult application of electric power system simulation calculation, complex model, unsuitable and other problems

CN102412596BActive Publication Date: 2013-11-06HUNAN UNIV
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
Publication Date
2013-11-06

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Abstract

The invention discloses an equivalent simulation method for a grid-connected photovoltaic power generation system. In the grid-connected photovoltaic power generation system, a direct current is converted into an alternating current with the same amplitude value, the same frequency and the same phase as those of a grid voltage by a photovoltaic array through an inverter, and the alternating current is connected with a power grid, so that the photovoltaic array which is operated normally is equivalent to a constant-current source. The mathematical model of a grid-connected power generation system is represented by the following third-order dynamic differential equations which are shown in the specification, and the active response P and the reaction response Q of the grid-connected photovoltaic power generation system are shown in the specification. By the equivalent simulation method of the grid-connected photovoltaic power generation system, the steady state and transient characteristics of the photovoltaic power generation system under a grid-connected operation condition can be simulated accurately; and the equivalent simulation method can serve as a research tool of the grid-connected photovoltaic power generation system.
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Description

technical field

[0001] The invention relates to an equivalent simulation method for a grid-connected photovoltaic power generation system, which belongs to the technical field of electric power. Background technique

[0002] In recent years, the global energy crisis has become increasingly serious, environmental protection and low-carbon economy have become the focus of society, and the development of new energy has been highly valued by many countries. Distributed Generation Source (DGS) has the advantages of less pollution, high reliability, high energy utilization rate, flexible installation location, etc., and its proportion in the power grid is increasing day by day. Different factors such as various DGS's own characteristics, power output level, and distribution location may have different degrees of influence on the comprehensive load characteristics of the distribution network. Therefore, how to accurately describe the comprehensive load of the distribution network a...

Examples

Embodiment 1

[0045] The equivalent simulation method of the grid-connected photovoltaic power generation system of the present invention, the specific implementation steps are as follows:

[0046] (1) Study the power generation principle of PV. The present invention is represented by the practical mathematical model of PV engineering, and builds the model of PV in MATLAB / Simulink to study the characteristics of PV.

[0047] For the mathematical model of PV, there are relevant researches both at home and abroad, and the present invention quotes the module built by the formula in the included papers of IEEE, referring to the following references: J.A.Gow, C.D.Manning.Development of a Model for Photovoltaic Arrays Suitable for Use in Simulation Studies of Solar Energy Conversion Systems. In: Proc. of IEE Conference on Power Electronics and Variable Speed ​​Drives, 1996, 69-74.

[0048] Based on the engineering practical mathematical model of the above-mentioned PV, the simulation is carried o...