Photovoltaic power generation microgrid simulation system

Abstract

The invention relates to a photovoltaic power generation microgrid simulation system, which comprises a simulation photovoltaic cell, a control module and a simulation load, the simulation photovoltaic cell adopts a single-diode model; two ends of the simulation photovoltaic cell are connected with simulation loads; the control module adopts a variable step size disturbance observation method to perform maximum power tracking control on the simulation photovoltaic cell; and the control module is used for fitting the output characteristics of the simulation photovoltaic cell. The single-diode model of the photovoltaic cell provided by the invention has the beneficial effects that the load current can be calculated more simply and accurately by considering both the series resistance and theparallel resistance, so that the accuracy of a photovoltaic power generation microgrid simulation system can be improved. The current output power can be quickly adjusted to the maximum output power through the variable step size disturbance observation method, and then the running speed of the system can be increased on the premise that it is guaranteed that the photovoltaic cell is used for power generation to the maximum extent.

Description

Technical field [0001] The invention relates to the field of photovoltaic power generation, and in particular includes a photovoltaic power generation microgrid simulation system. Background technique [0002] The photovoltaic power generation microgrid system generally consists of photovoltaic arrays, corresponding control devices and loads. Photovoltaic cell is the smallest unit of photovoltaic array. Common models of photovoltaic cell include single diode RS model and double diode D-diode model. The RS model of photovoltaic cell requires fewer parameters for simulation calculation, but the model is accurate when temperature changes. The degree is relatively low. The D-diode model requires a large number of parameters for simulation calculation. Although the calculation of parameters can be reduced by simplifying, the simplification will also have a great impact on the accuracy of the model. [0003] When the photovoltaic cell is working, with the change of light intensity and ...

AI Technical Summary

Problems solved by technology

At present, the disturbance observation method with fixed step size is usually used to track and control the maximum power of the battery, but the method of fixed step size is not flexible. When the current output power is far away from the maximum power source, it has problems such as slow operation of the system.

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