Modeling method for photovoltaic power generation system model

Abstract

The invention provides a modeling method for a photovoltaic power generation system model. The method includes the steps: selecting and calculating a photovoltaic power generation system calculation base, and converting a power grid load flow calculation unit value into a photovoltaic power generation system calculation unit value; calculating a transient initial value of a photovoltaic power generation system; building a photovoltaic square array model; and building a grid-connected photovoltaic inverter model. The modeling method is used for modeling a positive sequence component of the photovoltaic power generation system and can be extended into a modeling method for modeling the positive sequence component and a negative sequence component, the model is applied to transient, stable and analytical calculation of a photovoltaic access power grid, and basic model platform support is provided for planning and design of the photovoltaic access power grid and research of the interaction relationship between the photovoltaic access power grid and a power grid.

Description

technical field [0001] The invention belongs to the field of power system analysis and calculation, and in particular relates to a modeling method of a photovoltaic power generation system model used for transient calculation of photovoltaic access to a power grid. Background technique [0002] Photovoltaic power generation has the characteristics of intermittent, fluctuating, and random. Large-scale photovoltaic access brings new challenges to power grid security and stability analysis, dispatch control, system voltage regulation, and security protection configuration. Study the modeling method of grid-connected photovoltaic system, establish a grid-connected photovoltaic model whose accuracy and reliability can meet the safety and stability analysis of photovoltaic grid-connected operation, and provide a basic model platform support for the planning and design of photovoltaic grid-connected grid and its interaction with the grid , is of great significance. [0003] The el...

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Problems solved by technology

[0004] At present, some photovoltaic power generation system models have established detailed models of inverters containing photovoltaic cells and power electronic devices. This method is suitable for equipment research and development, but it is too detailed for electromechanical transient analysis of power systems.

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