Harmonic flow calculation method for large-scale photovoltaic power station current collection system of domestic energy

Abstract

The invention discloses a harmonic flow calculation method for a large-scale photovoltaic power station current collection system of domestic energy. The harmonic flow calculation method comprises the following steps: S1, establishing an equivalent model for each component involved in a harmonic transfer network used in the large-scale photovoltaic power station current collection system of domestic energy; S2, converting the structure of the large-scale photovoltaic power station current collection system into an equivalent impedance structure, and constructing an equivalent model for the harmonic transfer network according to the equivalent impedance structure and the equivalent model of each component so as to obtain a node admittance matrix of the harmonic transfer network; and S3, obtaining the harmonic voltage of each node according to injected harmonic current of each harmonic source node and the node admittance matrix of the harmonic transfer network so as to acquire a harmonic flow. The method takes the influences of cable parameters of the current collection system in the large-scale photovoltaic power station current collection system on harmonic analysis results, the influences of parameters of an LCL filter on the harmonic flow analysis results and the influences of the cable parameters on harmonic flow calculation results into full account, so that the accuracy of harmonic flow calculation is improved.

Description

technical field [0001] The invention relates to a method for calculating the harmonic flow of a large-scale photovoltaic power station collection system, in particular to a method for calculating the harmonic flow of a large-scale photovoltaic power station collection system for household energy. Background technique [0002] my country is currently accelerating the construction of a resource-saving and environment-friendly society. The proportion of green energy such as electric energy will continue to increase, and household energy will also be converted from traditional energy to green energy. Home photovoltaic power generation is now widely used. Photovoltaic power generation specifically refers to a power generation system that uses photovoltaic modules to directly convert solar energy into electrical energy. It is a new type of power generation and comprehensive utilization of energy with broad development prospects. [0003] In 2015, my country's new energy power ge...

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Problems solved by technology

From the control level of the inverter, the influence of grid impedance on the harmonics and resonance of large-scale photovoltaic power plants has been studied. However, when performing network equivalents, the internal components and connection methods of the large-scale photovoltaic power plant collection system have not been taken into consideration, so it cannot be accurately Effectively analyze the influence of harmonics and resonance in the collection system of large-scale photovoltaic power plants, and then take effective measures

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