Efficient photovoltaic power generation system

Abstract

The invention discloses an efficient photovoltaic power generation system, comprising a photovoltaic array, an inductor L, a power electronic starting device, a power converter, a power grid or a load. The positive electrode of the photovoltaic array is connected with one end of the inductor L; the other end of the inductor L and the positive terminal of the power electronic starting device are co-connected with the positive terminal of the power converter. The negative terminal of the power electronic starter and the negative terminal of the power converter are connected to the negative electrode of the photovoltaic array. The power converter converts direct current to alternating current and is connected to the power grid or load. As existing photovoltaic power generation systems use diodes to prevent current from flowing backwards from power converters to photovoltaic arrays, and when the diode is turned on, there is a certain voltage drop, which will reduce the efficiency of the photovoltaic power generation system. Therefore, the invention proposes that the diode at the output end of the photovoltaic array is replaced by an inductance and a power electronic starting device, thus overcoming the power loss problem existing in the diode, and improving the efficiency of the whole photovoltaic power generation system.

Description

Technical field [0001] The invention belongs to the technical field of photovoltaic power generation, and specifically relates to a high-efficiency photovoltaic power generation system. technical background [0002] Photovoltaic power generation is a technology that uses the photovoltaic effect of the semiconductor interface to directly convert light energy into electrical energy. The existing photovoltaic power generation system is attached figure 1 As shown, the photovoltaic array converts solar energy into direct current and then connects to a power converter. The power converter inverts the direct current into alternating current and supplies it to the grid or AC load. Among them, in order to prevent current from flowing from the power converter to the photovoltaic array, a diode needs to be connected in series with the output end of the photovoltaic array. However, the series diode has a certain on-state voltage drop, which will cause power loss and is not conducive to impr...

AI Technical Summary

Problems solved by technology

However, there is a certain on-state voltage drop of series diodes, which will cause power loss, which is not conducive to improving the efficiency of photovoltaic power generation systems.

[0003] Assuming that the output power of the photovoltaic array in a photovoltaic power generation system is 2000W, the output voltage is 20V, the output current is 100A, and the voltage drop of the diode connected in series at the output of the photovoltaic array is 1V, then the power consumed on the diode is 100W, that is Before the photovoltaic power is sent to the power converter, the power has been reduced by 5%, which is not conducive to the high efficiency of the photovoltaic power generation system; at the same time, because the diode consumes power and generates heat during use, it is not conducive to the stability and stability of the system. service life and will increase the cost of the entire system while solving the heat dissipation problem

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