Equivalent simulation method for grid-connected photovoltaic power generation system

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.

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...

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Problems solved by technology

However, these models are complex, and there are great difficulties in the application of power system simulation calculations, and there is no equivalent description model for load modeling, which is not suitable for the simulation calculation of comprehensive load characteristics on the distribution network side considering PV.

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