TWI564689B - Power supply for simulating solar cell and method thereof - Google Patents

Description

Power supply for simulating approximate solar cells and method thereof

The present invention relates to a power supply for simulating an approximate solar cell and a method thereof, and more particularly to a method in which a difference between an open circuit voltage value and an output voltage value of a solar cell is equal to a product of an analog resistance value and a solar cell analog current value. A power supply and method for simulating an approximate solar cell.

With the increasing demand for energy, renewable energy has become a very important issue in today's energy development. Therefore, renewable energy such as solar energy, wind energy, tidal energy and biomass energy has gradually become the focus of development. Among them, the application of solar cells is more commonly developed by the existing industry. In the case of solar cells, the current industry generally simulates the voltage and current curves of the approximate solar cells through the power supply, and the existing analog mode uses the power supply. The output of the supplier is connected in series with a resistor to simulate the voltage and current curves of the solar cell by measuring the voltage at the output.

However, the series resistance at the output of the power supply consumes thermal energy, and it is necessary to prepare different resistances for simulation according to the specifications of different solar cells, thereby adding additional cost and not being able to perform a wide range of automation according to different situations. Simulation, which makes it inconvenient to use in practice, therefore, now There is still room for improvement in the way of simulating the voltage and current curves of a similar solar cell.

In view of the existing method of simulating the voltage and current curves of the solar cell through the external resistance of the power supply, there is generally a problem of high cost and inability to simulate in a wide range. Accordingly, the main object of the present invention is to provide a power supply for simulating an approximate solar cell and a method thereof, which are mainly based on a difference between an open circuit voltage value and an output voltage value of a solar cell equal to an analog resistance value and a solar cell analog current. The product of the values directly simulates the voltage and current curves of the approximate solar cell.

Based on the above object, the main technical means adopted by the present invention provides a power supply for simulating an approximate solar cell, which performs a plurality of measurement procedures to simulate a voltage current curve of a solar cell, and the power supply includes an output. The module, the measurement module and the simulation calculation module, the output module is configured to provide a plurality of power supply output voltages in the measurement programs, and the measurement module is electrically connected to the output module. And in the measuring programs, measuring a plurality of output voltage values corresponding to the output voltages of the power supplies. The simulation calculation module is electrically connected to the measurement module, and sets at least one set of solar cell characteristic parameters, and each set of solar cell characteristic parameters includes a solar cell open circuit voltage value, a solar cell short circuit current value and an analog resistance value, The simulation calculation module calculates the plurality of solar cell simulations for each of the output voltage values according to the difference between the open circuit voltage value of the solar cell and the output voltage value is equal to the product of the analog resistance value and a solar cell analog current value. The current value is used to simulate a voltage current curve of the approximate solar cell by using the corresponding relationship between the output voltage values and the simulated current values of the solar cells. Wherein, the simulated calculus module has greater than the simulated current value of the solar cells When the solar cell short-circuit current value is used, the solar cell analog current value is commanded to be equal to the solar cell short-circuit current value.

In a preferred embodiment of the above-mentioned power supply device, the analog calculus module is disposed in a processing chip in a firmware form, and each output voltage value is defined as Vmea, and the solar cell open circuit voltage value is defined as Voc, the solar cell short-circuit current value is defined as Isc, the analog resistance value is defined as R, and the simulation calculus module calculates the solar cell analog current value according to a calculus (Voc-Vmea)/R. In addition, the output module provides the power supply output voltages in a certain current control mode, and the measurement module performs the measurement procedures by using each sampling value of the solar cell open circuit voltage value, and the sampling value is 1% to 4%.

Based on the above object, the main technical means adopted by the present invention further provides a method for simulating a voltage current curve of an approximate solar cell, which uses a power supply to perform a plurality of measurement procedures to simulate a voltage and current curve of a solar cell, and simulates In the method of approximating the voltage current curve of the solar cell, the first step is to first set at least one set of solar cell characteristic parameters, each set of solar cell characteristic parameters including a solar cell open circuit voltage value, a solar cell short circuit current value and an analog resistor The second step is to provide a plurality of power supply output voltages in the measurement programs, and the third step is to measure the output voltages of the power supply devices in the measurement programs. a plurality of output voltage values, the last step is based on the product of the open circuit voltage value of the solar cell and the output voltage value being equal to the product of the analog resistance value and a solar cell analog current value, respectively calculating for each of the output voltage values Exceed a number of solar cell analog current values and utilize the outputs The relationship between these voltage values corresponding to the analog current value of the solar cell and the voltage-current curve approximation analog solar cells. Wherein, when the simulated current value of the solar cells is greater than the short-circuit current value of the solar cells, the simulated current values of the solar cells are It is ordered to be equal to the short-circuit current value of the solar cell.

In the preferred embodiment of the above-mentioned method for simulating the voltage current curve of the solar cell, the second step is performed by one of the output modules included in the power supply, and the third step is the power supply. The one of the power supply modules is electrically connected to the measurement module of the output module, and the first step and the last step are electrically connected to the measurement module by a power supply. Module to execute. In addition, each output voltage value is defined as Vmea, the solar cell open circuit voltage value is defined as Voc, the solar cell short circuit current value is defined as Isc, the analog resistance value is defined as R, and the last step is based on a calculation formula (Voc- Vmea)/R calculates the solar cell analog current value. In addition, the second step provides the power supply output voltages in a certain current control mode.

After the main technical means for simulating the power supply of the solar cell and the method thereof, the difference between the open circuit voltage value and the output voltage value of the direct solar cell is equal to the analog resistance value and a solar cell simulation. The product of the current value directly simulates the voltage and current curve of the approximate solar cell, so the additional series resistance is not needed to effectively reduce the simulation cost, and the user only needs to set the solar cell open circuit voltage value, the solar cell short circuit current value and the analog resistance. The value allows for a wide range of automatic simulations, which greatly increases the ease of use.

The specific embodiments of the present invention will be further described by the following examples and drawings.

1‧‧‧Power supply

11‧‧‧Output module

12‧‧‧Measurement module

13‧‧‧Analysis calculus module

131‧‧‧Solar cell characteristics

100, 200‧‧‧ voltage and current curves of solar cells

Voc‧‧‧ solar cell open circuit voltage value

Isc‧‧‧ solar cell short circuit current value

S101-S104‧‧‧Steps

The first figure shows the electricity used to simulate an approximate solar cell in accordance with a preferred embodiment of the present invention. A block diagram of a source supply; a second diagram showing a waveform of a voltage and current curve of an approximate solar cell in accordance with a preferred embodiment of the present invention; and a third diagram showing the voltage and current of a simulated near solar cell in accordance with a preferred embodiment of the present invention. A schematic diagram of the flow of the method of the curve.

Since the power supply for simulating the approximate solar cell and the method thereof are provided by the present invention, the combined embodiments thereof are numerous, and therefore will not be further described herein, and only a preferred embodiment will be specifically described.

Referring to the first and second figures, the first figure shows a block diagram of a power supply for simulating an approximate solar cell according to a preferred embodiment of the present invention, and the second figure shows a preferred embodiment of the present invention. A schematic diagram of the waveform of a voltage-current curve of an approximate solar cell. As shown in the figure, the power supply 1 (hereinafter referred to as the power supply 1) for simulating an approximate solar cell according to a preferred embodiment of the present invention performs a plurality of measurement procedures to simulate a voltage current curve of a solar cell.

The power supply device 1 includes an output module 11, a measurement module 12, and an analog calculation module 13. The output module 11 can be, for example, an output stage circuit of a power supply, and the measurement module 12 is electrically connected to the The output module 11 can be an existing measuring circuit or can be disposed in a processing wafer in the form of a firmware. The simulation calculation module 13 is electrically connected to the measurement module 12, and can also be disposed in the above-mentioned processing wafer in the form of a firmware.

In practice, the user can trigger the above-mentioned plurality of measurement programs through the operation panel of the power supply device 1, and after the startup, the output module 11 correspondingly provides a plurality of power supply devices in the measurement programs. Output voltage Generally, in practice, the control output module 11 provides the power supply output voltages in a certain current control mode, but the other embodiments are not limited thereto.

The measurement module 12 measures a plurality of output voltage values corresponding to the output voltages of the power supplies in the measurement programs. In the preferred embodiment of the present invention, each output voltage value is defined as Vmea. .

The simulation calculation module 13 is configured with at least one set of solar cell characteristic parameters 131 (only one is shown), and each set of solar cell characteristic parameters 131 includes a solar cell open circuit voltage value, a solar cell short circuit current value and an analog resistance value. In the preferred embodiment of the present invention, the solar cell open circuit voltage value is defined as Voc, the solar cell short circuit current value is defined as Isc, and the analog resistance value is defined as R.

In other words, the user can set the corresponding solar cell characteristic parameter 131 according to the specification of the solar cell to be simulated, and through the operation panel of the power supply device 1, and after the setting is completed, trigger the simulation calculation module 13 according to the solar energy. The difference between the open circuit voltage value Voc and the output voltage value Vmea is equal to the product of the analog resistance value R and a solar cell analog current value (hereinafter defined as I), and a complex number is calculated for each of the output voltage values Vmea The solar cells simulate the current value I, and use the corresponding relationship between the output voltage value Vmea and the simulated current value I of the solar cells to simulate the voltage and current curves 100, 200 of the solar cell as shown in the second figure, and the voltage current The curve 100 can be, for example, a curve having an analog resistance value of 10 (ohms), and the voltage current curve 200 can be a curve having an analog resistance value of 5 (ohms).

Specifically, the simulation calculation module 13 calculates the solar cell analog current value I according to a calculation formula (Voc-Vmea)/R, and can calculate the voltage of the approximate solar battery according to the difference of the output voltage value Vmea. Current curve, wherein in the preferred embodiment of the invention, the measurement module 12 is powered by a solar cell Each sampling value of the circuit voltage value Voc is subjected to the measurement procedures, and the sampling value is between 1% and 4%. By using the above sampling values, different numbers of data points can be obtained to complete the voltage current curve of the approximate solar cell. The simulation and further complete the Maximum Power Point Tracking (MPPT).

The simulation calculation module 13 commands the solar cell analog current value I and the solar cell short-circuit current value to be equal to Isc (ie, I=Isc) when the solar cell analog current value I is greater than the solar cell short-circuit current value Isc. Further, in the voltage current curves 100 and 200 shown in the second figure, the first half is a fixed horizontal line.

It can be seen from the above that the main spirit of the present invention is to simulate the voltage and current curves of the approximate solar cell through the calculation of the simulation calculation module 13, so that the firmware calculation method does not require another series resistance, so that the user can perform the operation at any time. A wide range of simulations to increase convenience.

Please refer to the third figure, which is a flow chart showing a method for simulating a voltage current curve of an approximate solar cell according to a preferred embodiment of the present invention. As shown in the third figure, the method for simulating the voltage current curve of the solar cell is to simulate the voltage current curve of the approximate solar cell by using the power supply 1 shown in the first figure, and includes the following steps: Step S101: setting at least one a set of solar cell characteristic parameters 131; step S102: correspondingly providing a plurality of power supply output voltages in the plurality of measurement programs; step S103: measuring the output voltages of the power supply devices in the measurement programs The plurality of output voltage values Vmea; step S104: according to the difference between the solar cell open circuit voltage value Voc and the output voltage value Vmea is equal to the analog resistance value R and a solar cell analog current Calculating a plurality of solar cell analog current values I for each of the output voltage values Vmea, and simulating the correspondence between the output voltage values Vmea and the solar cell analog current values I Approximate the voltage and current curve of a solar cell.

The step S101 is performed by the simulation calculation module 13 of the power supply device 1 shown in the first figure, and the solar cell characteristic parameter 131 also includes the solar cell open circuit voltage value Voc, the solar cell short circuit current value Isc and the analog resistor. The value R, in step S102, is performed by the output module 11 of the power supply 1 shown in the first figure, and the step S103 is performed by the measurement module 12 of the power supply 1 shown in the first figure. Step S104 is executed by the simulation calculation module 13 of the power supply 1 . In addition, in step S104, when the solar cell analog current value I is greater than the solar cell short-circuit current value Isc, the solar cell analog current values I are commanded to be equal to the solar cell short-circuit current value Isc. The rest are the same as the power supply 1 shown in the first figure, and will not be described again.

The spirit of the present invention is that the analog resistance value R can be set, and the plurality of output voltage values Vmea can be measured and calculated to obtain a plurality of solar cell analog current values I, thereby simulating a voltage current curve of the approximate solar cell. In this way, the user can perform a wide range of simulations, and it is not necessary to spend time to actually connect the resistors or replace the resistors with different resistance values, thereby greatly increasing the convenience, and also because there is no need to connect the resistors in series. In the process of simulation, there is no loss of thermal energy, so there is energy saving effect.

In summary, after the power supply and method for simulating an approximate solar cell provided by the present invention are used, since the solar cell characteristic parameter and the analog resistance value can be directly set to directly simulate the voltage current curve of the approximate solar cell, Therefore, the simulation cost can be effectively reduced, and only the solar cell is required to be turned on. The road voltage value, the short-circuit current value of the solar cell, and the analog resistance value can be subjected to a wide range of automatic simulations, thereby greatly increasing the convenience of use.

The features and spirit of the present invention will be more apparent from the detailed description of the preferred embodiments. On the contrary, the intention is to cover various modifications and equivalents within the scope of the invention as claimed.

1‧‧‧Power supply

11‧‧‧Output module

12‧‧‧Measurement module

13‧‧‧Analysis calculus module

131‧‧‧Solar cell characteristics

Claims (8)

A power supply for simulating an approximate solar cell, which performs a plurality of measurement procedures to simulate a voltage and current curve of a solar cell, the power supply comprising: an output module for use in the measurement programs Correspondingly providing a plurality of power supply output voltages; a measuring module electrically connected to the output module, wherein the plurality of power supply output voltages corresponding to the power supply are measured in the measuring programs An output voltage value; and a simulation calculation module electrically connected to the measurement module and setting at least one set of solar cell characteristic parameters, each set of the solar cell characteristic parameters including a solar cell open circuit voltage value, a solar energy a short circuit current value of the battery and an analog resistance value, wherein the difference between the open circuit voltage value of the solar cell and the output voltage value is equal to a product of the analog resistance value and a solar cell analog current value, and the output voltage is Each of the values separately calculates a plurality of solar cell analog current values and uses the output voltage values with the sun The corresponding relationship between the simulated current values of the battery simulates a voltage and current curve of the solar cell; wherein the simulation calculation module commands the simulated current values of the solar cells when the simulated current values of the solar cells are greater than the short-circuit current values of the solar cells The solar cell short circuit current values are equal. The power supply device of claim 1, wherein the simulation calculation module is disposed in a processing wafer in a firmware form. The power supply of claim 1, wherein the output module provides the power supply output voltages in a certain current control mode. The power supply device of claim 1, wherein the measurement module performs the measurement procedure for each sample value of the solar cell open circuit voltage value, the sample value is between 1% and 4%. A method for simulating a voltage current curve of a solar cell is to use a power supply to perform a plurality of measurement procedures to simulate a voltage current curve of a solar cell. The method for simulating a voltage current curve of a solar cell includes the following steps: Setting at least one set of solar cell characteristic parameters, each set of the solar cell characteristic parameters comprising a solar cell open circuit voltage value, a solar cell short circuit current value and an analog resistance value; (b) providing a plurality of corresponding values in the measurement programs a power supply output voltage; (c) measuring, in the measurement programs, a plurality of output voltage values corresponding to the output voltages of the power supply; and (d) determining an open circuit voltage value according to the solar cell The difference between the output voltage values is equal to the product of the analog resistance value and a solar cell analog current value, and a plurality of solar cell analog current values are respectively calculated for each of the output voltage values, and the output voltage values are utilized. Corresponding relationship with the simulated current values of the solar cells a voltage current curve of the solar cell; wherein, when the solar cell analog current value is greater than the solar cell short circuit current value, the solar cell analog current values are commanded to be equal to the solar cell short circuit current value. The method for simulating a voltage current curve of an approximate solar cell according to claim 5, wherein the step (b) is performed by one of the output modules included in the power supply, and the power supply is The measuring module including one of the output modules is electrically connected to perform the step (c). The method for simulating a voltage and current curve of a solar cell as described in claim 6 , wherein the step is performed by using a simulation calculation module electrically connected to the measurement module (a) and step (d). The method for simulating a voltage current curve of a solar cell as described in claim 5, wherein the power supply output voltage is provided in the step (b) in a certain current control mode.