Large-scale photovoltaic power station and distribution grid harmonic wave cross-impact analysis model building method

Abstract

The invention discloses a large-scale photovoltaic power station and distribution grid harmonic wave cross-impact analysis model building method and belongs to the technical field of new energy power generation and transmission. The large-scale photovoltaic power station and distribution grid harmonic wave cross-impact analysis model building method is mainly used for analyzing harmonic wave interaction influence of a large-scale photovoltaic power station and a distribution grid. The large-scale photovoltaic power station adopts a power electronic device as a grid-connection interface and can fill a large amount of harmonic wave into a power grid inevitably, and by means of specificity of a photovoltaic inverter, the generated harmonic wave has the advantages of being wide in broadband, high in frequency and capable of generating series-parallel connection resonance with distributed capacitors of the power grid. A large-scale photovoltaic power station and distribution grid harmonic wave cross-impact analysis model is formed by a photovoltaic harmonic analysis model and a distribution grid equivalent circuit, the photovoltaic harmonic analysis model is used for analyzing power station harmonic wave output characteristics, and the distribution grid equivalent circuit is used for representing the distribution grid which the power grid is connected in. The large-scale photovoltaic power station and distribution grid harmonic wave cross-impact analysis model can provide a theoretical basis for issues of photovoltaic power station and distribution grid planning, harmonic wave estimation, estimation of photovoltaic power station accepting capability of the distribution grid, photovoltaic grid connection regulation formulation and the like.

Description

technical field [0001] The invention relates to the technical field of new energy power generation and power transmission, in particular to a method for modeling a large-scale photovoltaic power station and a distribution network harmonic interaction analysis model modeling method. Background technique [0002] In recent years, with the implementation of the "Golden Sun Demonstration Project", the solar energy industry will receive greater support in terms of policies, and China's photovoltaic industry is undergoing a process of rapid development. Photovoltaic power stations are developing towards large-scale and large-scale development. Several megawatt-level grid-connected photovoltaic power stations have started construction or operation in Qinghai, Gansu, Ningxia and other places. my country has also formulated corresponding grid-connected technical regulations, but the current large-scale photovoltaic power stations in China Still focus on engineering demonstration, main...

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Problems solved by technology

[0007] The technical problem to be solved by the present invention is that because the harmonics of the photovoltaic power station have the particularity of high frequency and wide frequency range, it is easy to generate series and parallel resonance with the distribution network, and the harmonic voltage and current at the resonance point will be amplified several times, which may Affecting the safe and stable operation of distribution network and photovoltaic power station, providing a modeling method for the analysis of harmonic interaction between photovoltaic power station and distribution network Drawing analysis to judge whether there is resonance

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