Photovoltaic power generation system stability analysis method considering power control influence based on description function method

Abstract

The invention relates to a photovoltaic power generation system stability analysis method considering power control influence based on description function method. The photovoltaic power generation system uses disturbance observation method to achieve maximum power control. For the non-linear, discontinuous characteristics, the method utilizes a description function to establish a power control model based on the disturbance observation method. The method combines with a small signal modeling of photovoltaic power generation system, and forms a complete system model considering power control influence. Then the description function method is adopted to analyze the stability of the photovoltaic power generation system. This method solves the problem that small signal stability analysis cannot be applied to discontinuous and nonlinear links. The relevant parameters of the disturbance observation method in the system stability analysis are introduced to make the analysis more comprehensive and accurate. At the same time, the method provides the basis for power controller parameter setting.

Description

technical field [0001] The invention relates to a stability analysis method of a photovoltaic power generation system considering the influence of power control based on a description function method, belonging to the stability analysis category in the field of photovoltaic system control. Background technique [0002] In recent years, the proportion of photovoltaic power generation has continued to increase, and the installed capacity has continued to grow. The stability control of photovoltaic power generation systems has gradually received attention. In order to make better use of light energy, an appropriate control method must be used to achieve maximum power point tracking, among which the perturbation and observation method is the most widely used. However, the perturbation-and-observe method is nonlinear and discontinuous, which makes the traditional small-signal stability analysis methods difficult to apply. The currently known analysis methods, including impedance...

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Problems solved by technology

[0004] The purpose of the present invention is to propose a stability analysis method for photovoltaic power generation systems that considers the influence of power control based on the description function method, so as to solve the problem of non-linear and discontinuous links when using the perturbation and observation method to achieve maximum power control, and the traditional stability analysis method is difficult to apply The problem

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