Maximum power tracking controller for photovoltaic power generation based on digital signal processor

Abstract

The invention discloses a photovoltaic power-generating maximal power tracking controlling device based on a digital signal processing device, which comprises a direct current converter, a voltage and electric current detecting module, a controlling module and a driving and protecting module, wherein the input end of the direct current converter is connected with the output end of a solar batteryarray, the output end is connected with the input end of a synchronization inverter through a direct current bus bar, the synchronization inverter is connected with an electric network, the input endof the voltage and electric current detecting module is connected with the output end of the voltage and electric current detecting module, the output end of the voltage and electric current detecting module is connected with the input end of the controlling module, the output end the controlling module is connected with the input end of the driving and protecting module, and the output end of the driving and protecting module is connected with a grid electrode G of an isolated-gate bipolar field effect transistor of the direct current converter. The device has the beneficial effects of beingeasy to popularize and use as the cost is low, reducing the difficulty of the system controlling realization, and increasing controlling effect. The installation of the invention is flexible, maintenance is convenient, and the influence of a single branch fault can be reduced in the maximum limit.

Description

technical field [0001] The invention relates to the technical field of control of solar photovoltaic grid-connected power generation, in particular to a maximum power tracking control device for photovoltaic power generation based on a digital signal processor. Background technique [0002] As an important renewable energy source, solar energy is abundant and clean, and it is an important part of the energy strategy for sustainable development of human beings. It has developed rapidly in recent years. The transformation of solar energy from supplementary energy to alternative energy, the development of solar power from areas without electricity to areas with electricity, and the development of solar photovoltaic systems from off-grid independent photovoltaic systems to photovoltaic grid-connected systems are the three development trends of solar energy utilization. There is a working point at which the solar cell array outputs the maximum power at any moment, which is called...

AI Technical Summary

Problems solved by technology

The defect in the above-mentioned prior art is that the grid-connected inverter 6 needs to convert the direct current output by the solar cell array 8 into an alternating current that meets the requirements of the power grid 7, and also has the function of maximum power tracking

Therefore, its control method is extremely complicated and difficult to realize

Since the grid-connected inverter 6 must have an isolation transformer to electrically isolate the photovoltaic grid-connected system from the grid, the cost of the photovoltaic grid-connected system is high, and ordinary users cannot afford it, thus limiting the promotion of photovoltaic grid-connected systems

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