Method for eliminating damage of hot marks by controlling operating point with set voltage range of photovoltaic module

Abstract

The invention relates to a method for eliminating damage of hot marks by controlling an operating point with a constant voltage range of a photovoltaic module. The method comprises the following steps that an output end of the module is connected in series with an MPPT (Maximum Power Point Tracking) functional module and a DC-DC module sequentially; and the MPPT functional module searches the maximum power point of the module to track in a set operating voltage range. A method for setting the operating voltage range comprises the step of calculating an actual optimum operating voltage Vm when the module is not shielded by environment temperature Ta, irradiation strength R, a module temperature rise coefficient K caused by irradiation, a module temperature voltage coefficient Ct and a nominal rated optimal operating point voltage of the module at a temperature of 25 DEG C, which are obtained by measurement, according to a formula that Vm=Vmr-Ct(Ta+R*K-25), wherein the range of Vm+Vr to Vm-Vr is the set operating voltage range and Vr represents the maximum reverse bias voltage of the shielded module. In the method, the damage of the hot marks to the module can be eliminated in a mode of controlling the voltage of the operating point of the photovoltaic module. Meanwhile, in the mode, the design of the photovoltaic module without a bypass diode can be realized and the power loss caused by mismatching of electrical properties between the modules can also be reduced.

Description

technical field [0001] The invention relates to a method for controlling the operating point of a photovoltaic module in a constant voltage range to eliminate hot spot damage. Background technique [0002] Since the output power of a single solar cell module is often not enough to provide the actual power required, they are usually connected in series and parallel to form a solar cell array to meet the design requirements. When selecting solar cell components to form an array, it is usually encountered that the output power after series and parallel connection is less than the sum of the output power of individual components due to the inconsistency of the electrical parameters of each component in series and parallel connection, which is called mismatch loss. At the same time, if the current does not match when connected in series, it will cause the individual components in the array to be in reverse bias when the array is working in a certain state, forming a "hot spot". I...

AI Technical Summary

Problems solved by technology

However, the bypass diode and the blocking diode will generate a lot of heat when they work, which has potential safety hazards.

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