A Method for Determining the Grounding Mode of the DC Boost Collective Access System of a Photovoltaic Power Station

Abstract

The application provides a method for determining the grounding mode of the DC boost collection access system of a photovoltaic power station. The method includes: analyzing the structure of the DC boost collection access system of a photovoltaic power station; The position of the optional grounding point of the high-voltage access unit; analyze the optional grounding method; establish the mathematical model of the photovoltaic power station DC boost collection access system, and analyze the operation of the optional grounding method of the photovoltaic power station DC boost collection access system Characteristics and fault characteristics; according to the mathematical model, check the short-circuit current of each optional grounding mode when the fault occurs, and determine the optional grounding mode of the photovoltaic power station DC boost collection access system. This method combines the topological structure of the DC boost collection access system to form a set of specific procedures for grounding mode selection; at the same time, the combination of mathematical models and simulation calculations is used to analyze fault characteristics, which improves the rationality and reliability of grounding mode selection.

Description

technical field [0001] The present application relates to the technical field of photovoltaic power station collection systems, and in particular, to a method for determining the grounding mode of a photovoltaic power station DC boost collection access system. Background technique [0002] At present, the photovoltaic power station mainly adopts the AC booster collection method to connect to the large power grid, and the AC booster collection access system is limited by its topology structure, and there are two main defects: on the one hand, the stability of multi-inverter parallel connection under weak synchronization support The problem is prominent; on the other hand, the loss of AC collection lines within and between stations is large; in view of these two problems, the DC boost collection access system of photovoltaic power plants has been gradually researched and applied, and the DC boost collection access system can not only overcome the above In addition to the two d...

AI Technical Summary

Problems solved by technology

[0002] At present, photovoltaic power plants are mainly connected to the large power grid through AC boosting and converging methods, and the AC boosting and converging access system is limited by its topology structure. There are two main defects: one is the stability of multi-inverter parallel connection under the support of weak synchronization The problem is prominent; on the other hand, the loss of the AC collection line in the station and between the stations is large; in view of these two problems, the DC boost collection access system of photovoltaic power stations has been gradually researched and applied. The DC boost collection access system can not only overcome the above In addition to the defects in the two aspects, it also has the following advantages: the loss of the DC boost collection line is small, the transmission capacity is large, and the efficiency is high; and at the same time it is beneficial to realize multi-terminal DC collection, DC boost collection and high-voltage DC transmission. Relevant technologies of boosting convergence access system

[0004] However, at present, there is no uniform standard for the grounding method of the photovoltaic DC boost collection access system, so there is an urgent need for a method for determining the grounding method of the photovoltaic power station DC boost collection access system

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