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Software control method for derating output power of photovoltaic inverter in case of over-temperature

A photovoltaic inverter and output power technology, applied in the direction of instruments, electrical components, emergency protection devices with automatic disconnection, etc., can solve the problems of low output power, loss of energy, and reduced utilization of photovoltaics, and achieve high-power charging and the effect of discharging

Active Publication Date: 2014-05-28
HUIZHOU TEN SOURCES SOLAR ELECTRICITY
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Problems solved by technology

However, although this method can achieve the purpose of controlling the working temperature, it will force the photovoltaic inverter itself to lower the output power when it can carry high power output, resulting in a decrease in photovoltaic utilization and energy loss.

Method used

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  • Software control method for derating output power of photovoltaic inverter in case of over-temperature
  • Software control method for derating output power of photovoltaic inverter in case of over-temperature

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Embodiment Construction

[0024] Such as figure 1 As shown, the software control method for derating the output power of the photovoltaic inverter over temperature includes the following steps:

[0025] A. Data storage:

[0026] Store the high voltage threshold, low voltage threshold, temperature-derating set power curve and efficiency-power curve in the form of a corresponding table; the efficiency-power curve is obtained during the photovoltaic inverter test process, It is divided into efficiency-power curve of low voltage mode, efficiency-power curve of rated voltage mode and efficiency-power curve of high voltage mode;

[0027] B. Current temperature detection: use the temperature detection module to detect the current temperature of the photovoltaic inverter;

[0028] C. Current power detection:

[0029] Use the power detection module to detect the current power of the photovoltaic inverter, and the obtained current power value is the initial power value of the derating target power;

...

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Abstract

The invention discloses a software control method for derating output power of a photovoltaic inverter in case of over-temperature. The method comprises the following steps: data storage, i.e., setting a power curve and an efficiency-power curve for temperature-derating and storing the curves in the form of a corresponding table; current temperature detection; current power detection; current DC voltage detection; efficiency-power curve selection; current efficiency determination; derating set power and efficiency determination; and derating target power calculation and determination, i.e., comparing the product value of the initial power value and the current efficiency of derating target power to the product value of the derating set power and efficiency, and if the product value of the initial power value and the current efficiency of the derating target power is greater than or equal to the product value of the derating set power and the efficiency, continuing diminishing the power value of the derating target power until the product value of the initial power value and the current efficiency of the derating target power is smaller than the product value of the derating set power and the efficiency. By using such a method, it is ensured that the photovoltaic inverter can maintain quite high power charge and discharge in case of over-temperature power derating.

Description

technical field [0001] The invention relates to a photovoltaic inverter, in particular to a software control method for derating output power of a photovoltaic inverter over temperature. Background technique [0002] On April 10, 2013, the State Intellectual Property Office published a utility model patent with the publication number CN202872349U, and the patent name is a circuit system that uses IGBT temperature to control inverter output power derating. The utility model relates to a utility model that uses IGBT temperature control The circuit system for derating the output power of the inverter includes an NTC resistance signal port, a sampling circuit, a gating circuit and a judgment circuit. The NTC resistance signal port is connected to the sampling circuit, and the sampling circuit is connected to the gating circuit and the judgment circuit. The communication circuit is connected with an output port, and the output port is connected with the inverter control board, an...

Claims

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Application Information

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IPC IPC(8): H02H7/122H02H5/04G06F19/00
Inventor 朱昌亚郭志华李松万华超洪光岱
Owner HUIZHOU TEN SOURCES SOLAR ELECTRICITY
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