Grid-connected photovoltaic simulation generating system based on DIgSILENT (Digital Simulation and Electrical NeTwork)

Abstract

The invention discloses a grid-connected photovoltaic simulation generating system based on a DIgSILENT (Digital Simulation and Electrical NeTwork). The grid-connected photovoltaic simulation generating system comprises a photovoltaic battery, wherein the photovoltaic battery is connected into a power grid after passing through a direct current inductor, a Boost circuit, an inverter circuit and a main transformer sequentially; a bypass chopper circuit is connected to a connecting joint between the Boost circuit and the inverter circuit and used for realizing low-voltage ride through; a filter capacitor is connected to a joint between the photovoltaic battery and the direct current inductor and used for absorbing ripple waves caused by the switch-on and switch-off of the Boost circuit; and a direct current capacitor is connected to a connecting joint between the Boost circuit and the inverter circuit and used for buffering a power difference between the Boost circuit and an inverter. The grid-connected photovoltaic simulation generating system disclosed by the invention is closer to the actual situations of a photovoltaic generating system on a main circuit structure and a control system, can be applied to the operation analysis of various types of power systems, and provides a detailed and accurate proof for researching the influences of photovoltaic generation on the power systems.

Description

technical field [0001] The invention relates to a DIgSILENT-based grid-connected photovoltaic simulation power generation system, which can be used to study the influence of photovoltaic power generation on a power system, and belongs to the field of power system digital simulation. Background technique [0002] Solar energy resources are abundant, widely distributed, renewable, and the utilization process is pollution-free, making it one of the first choices for new energy development. Photovoltaic power generation, as a main form of solar energy utilization, shows an extremely broad development space and application prospects due to its advantages such as low noise pollution and low maintenance costs. The domestic photovoltaic installed capacity is increasing year by year. In 2008, the domestic photovoltaic power generation installed capacity was 140,000 kilowatts, and in 2009 it reached 300,000 kilowatts. It is estimated that the domestic photovoltaic installed capacity i...

AI Technical Summary

Problems solved by technology

[0004] The technical problem to be solved by the present invention is to provide a grid-connected photovoltaic simulation power generation system model to solve the problem that the existing photovoltaic power generation system equivalent model in DIgSILENT is too simple and cannot accurately simulate the output characteristics of photovoltaic cells, the maximum power point tracking process and low voltage Disadvantages of the traversal process;

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