KR100983610B1 - Method, apparatus and computer-readable recording medium for coltrolling inclination angle of solar cell panel - Google Patents

Abstract

According to the present invention, in the inclination angle control of the inclined solar panel, the altitude at each time of the sun, the condition for not blocking the adjacent panel from the sunlight, the prevention of unnecessary power consumption consumed in the solar tracking operation, the minimum during the solar tracking operation Method, system, and computer readable method for controlling the inclination angle of the solar panel to obtain the maximum photovoltaic efficiency by optimally adjusting the inclination angle of the solar panel in consideration of the error range of the A recording medium. According to an embodiment of the present invention, a method for controlling the inclination angle of a solar cell panel, the method comprising: calculating an inclination angle of the sun, and controlling the inclination angle of the solar cell panel based on the calculated inclination angle of the sun A method is provided that includes a step.

Solar Cell, Panel, Tilt Angle, Tilt, Sun, Altitude, Tilt Angle, Sun Tracking

Description

METHOD, APPARATUS AND COMPUTER-READABLE RECORDING MEDIUM FOR COLTROLLING INCLINATION ANGLE OF SOLAR CELL PANEL}

The present invention relates to a method, a system, and a computer-readable recording medium for controlling the inclination angle of a solar cell panel. More particularly, in the inclination angle control of an inclined solar cell panel, an altitude and an adjacent time of the sun are adjacent. By optimally adjusting the inclination angle of the solar cell panel according to the environment in consideration of the condition of not blocking the panel from sunlight, preventing unnecessary power consumption in the solar tracking operation, and the minimum error range during the solar tracking operation. A method, system, and computer readable recording medium for controlling the inclination angle of a solar cell panel to obtain a photovoltaic power generation efficiency.

Recent rising oil prices, global environmental problems, depletion of fossil energy, waste disposal of nuclear power generation, and the selection of locations due to the construction of new power plants are raising interest in new and renewable energy. Research and development on batteries is being actively conducted.

A solar cell is a device that converts light energy into electrical energy by using a photovoltaic effect. The solar cell is classified into a silicon solar cell, a thin film solar cell, a dye-sensitized solar cell, and an organic polymer solar cell. . These solar cells are used independently as main power sources such as electronic clocks, radios, unmanned light towers, satellites, rockets, etc., and are also used as auxiliary power sources in connection with commercial AC power systems. Increasingly, interest in solar cells is increasing.

In photovoltaic power generation using such solar cells, power generation efficiency is a very important variable. That is, it is important to control the solar cell to receive the maximum amount of sunlight and to ensure the minimum power consumption.

To this end, techniques for controlling the position, tilt angle, direction, etc. of the solar cell panel have been proposed.

One of them is to measure the contrast ratio of each divided sensor using an optical sensor having four rhombus-shaped divisions and control the contrast ratio to be the same value so that the solar direction is perpendicular to the solar panel. There is a solar tracking control method by the tracking optical sensor. This method has the advantage of simple controller configuration and relatively accurate control when the amount of insolation is sufficient.However, if the weather is uneven, it is impossible to track the sun and abnormal control occurs. There is a problem that a phenomenon occurs and the sensor function is lost.

So recently, the solar tracking control method of the program control method is mainly used, which is a method of calculating the orientation of the sun by the solar azimuth equation and tracking the calculated solar orientation of the solar panel.

FIG. 1A is a diagram illustrating solar azimuth angles of each season, and FIG. 1B is a diagram schematically illustrating a method of controlling a solar cell panel using a solar azimuth angle.

As shown in FIG. 1A, the azimuth angle of the sun shows a difference for each season at one year intervals. For example, at a latitude of 36 °, the sun rises from -28.8 ° to the east during the winter solstice and drives from -28.8 ° to the west, from the east east during the spring and autumn equinoxes, to the west, and from + 30.2 ° east to the east. Exit and drive at + 30.2 ° west.

The azimuth angle of this sun is calculated by a formula such as A = cos ⁻¹ {(sin Φ · sin h − sin δ) / (cos Φ · cos h)}, where h = sin ⁻¹ (sin Φ Sin δ + cos Φ cos δ cos H), where Φ is the latitude of the observation, δ is the right ascension of the sun, h is the altitude angle of the sun, and H is the time angle.

In this manner, the solar cell panel is controlled as shown in FIG. 1B by estimating the azimuth angle of the sun which varies with each season and each date. That is, the control is performed to rotate the solar cell panel along the azimuth angle of the sun calculated for each day.

However, this method is well suited for rotary sun tracking controllers, but the slope tilting sun tracking controllers currently used mainly do not coincide with the sun's azimuth angle and the solar panel's tilt angle, and there is considerable error. There is an inadequacy.

In addition, in order to prevent the reduction of power generation caused by the shadow of the solar panel, a technique of performing backtracking control of the solar panel by programming to track the solar panel at a predetermined angle as opposed to the direction of movement of the sun at a certain time. This has been proposed. However, this technique causes inconvenience to periodically correct the backtracking angle and the moving angle.

On the other hand, in order to prevent unnecessary solar tracking control in cloudy weather or rainy weather, one solar radiation meter is fixed or attached to a sun tracker, and solar radiation data is acquired, and then the technology to determine when to stop solar tracking by comparing with a set reference value. Also, although proposed, there is a problem that the set reference value cannot be an absolute reference value.

In the solar tracking progress angle control method of the solar cell panel, when the azimuth angle of the sun is shifted by a set angle with respect to the solar cell panel, the solar cell panel is controlled to match the azimuth angle of the sun. There was a problem that there was always an error as much as the set angle.

The present invention is to solve the above-mentioned problems of the prior art, the object of the invention is to accurately predict the inclination angle of the sun for each time to control the inclined gradient solar cell panel to the optimal inclination angle.

In addition, another object of the present invention is to accurately predict the shadow length for each time of the solar cell panel, to solve the problem of lowering the power generation efficiency caused by covering the adjacent solar cell panel while at the same time to obtain the maximum power generation efficiency. will be.

On the other hand, another object of the present invention is to determine whether or not to stop the sun tracking operation by comparing the solar radiation measured by the solar tracking solar meter and the solar radiation meter measured by the reference solar meter, thereby determining the exact solar tracking timing according to the weather. To judge.

Further, another object of the present invention is to minimize the tracking error in the solar tracking operation of the solar cell panel.

According to one embodiment of the present invention for achieving the above object, a method for controlling the inclination angle of the solar cell panel, the step of calculating the inclination angle of the sun, and based on the calculated inclination angle of the sun A method is provided that includes controlling an inclination angle of a battery panel.

The step of calculating the inclination angle of the sun, after calculating the inclination time angle of the sun indicating the amount of change of the inclination of the sun per unit time of the sun, calculates the inclination angle of the sun for each time based on the altitude of the sun It may include the step.

로 표현되는 수학식에 의해 산출되며, 상기 M은 태양의 일남중 시각이고, 상기 t는 일출 시각 t1 또는 일몰 시각 t2이다. The tilt time angle of the sun,

It is calculated by the equation represented by, wherein M is the sunday time of the sun, t is the sunrise time t1 or sunset time t2.

,remind

,

, The sunrise time

,

에 의해 산출되고, Sunset time

Calculated by

E is the mean time difference, Δλ is the time difference between the standard time and the local mean time of the observation site, and H is the time angle of the sun.

H is,

와 같은 수학식에 의해 표현되고, 상기Φ는 관측지의 위도, δ는 태양의 적위이다.

Expressed by the following equation, Φ is the latitude of the observation site, δ is the declination of the sun.

Controlling the inclination angle of the solar cell panel may include adjusting the inclination angle of the solar cell panel to the same angle as the calculated inclination angle of the sun.

According to another embodiment of the present invention for achieving the above object, a method for controlling the inclination angle of at least one solar cell panel, the method comprising: calculating the shadow length of the solar cell panel based on the altitude of the sun, and Based on the calculated shadow length, a method comprising adjusting the inclination angle of the solar cell panel such that the shadow of the solar cell panel does not cover at least a portion of the adjacent solar cell panel.

In calculating the shadow length of the solar cell panel, the shadow length SL of the solar cell panel is calculated by a formula expressed by SL = tan (90 ° -cosh) sin αw, and the h Is an inclination angle of the sun, α is the inclination angle of the solar panel, w is the width of the solar panel, and adjusting the inclination angle of the solar panel, α + within the range to satisfy SL + (cosαw) ≤ L Determining a value.

The adjusting of the inclination angle of the solar cell panel may further include determining the α value as close as possible to a value of 90 ° -h.

According to another embodiment of the present invention for achieving the above object, a method for controlling the solar tracking operation of a solar cell panel, comprising the steps of measuring a reference solar radiation at a fixed position using a fixed reference solar radiation meter, Measuring a solar tracking solar radiation amount using a solar tracking solar radiation meter provided in the solar cell panel performing a solar tracking operation, and when the difference between the reference solar radiation amount and the solar tracking solar radiation amount is less than a predetermined value, the solar cell A method is provided that includes stopping sun tracking operations of a panel.

According to another embodiment of the present invention for achieving the above object, as a method for controlling the tracking progress angle during the solar tracking operation of the solar cell panel, the inclination angle of the sun with respect to the solar cell panel is set to the solar tracking angle When twisted by 1/2, the method includes tilting the solar cell panel by the solar tracking set angle.

According to another embodiment of the present invention for achieving the above object, as a system for controlling the inclination angle of the solar cell panel, calculating the inclination angle of the sun, based on the calculated inclination angle of the solar cell A system is provided that includes a device for controlling the tilt angle of a panel.

The calculation of the inclination angle of the sun is performed by calculating the inclination time angle of the sun representing the amount of change in inclination of the sun per unit time of the sun, and then calculating the inclination angle of the sun for each time based on an altitude of the sun in one degree (0 °). Can be.

로 표현되는 수학식에 의해 산출되며, 상기 M은 태양의 일남중 시각이고, 상기 t는 일출 시각 t1 또는 일몰 시각 t2이다. The tilt time angle of the sun is,

It is calculated by the equation represented by, wherein M is the sunday time of the sun, t is the sunrise time t1 or sunset time t2.

, remind

,

, Sunrise time

,

에 의해 산출되고, Sunset time

Calculated by

E is the mean time difference, Δλ is the time difference between the standard time and the local mean time of the observation site, and H is the time angle of the sun.

H is,

와 같은 수학식에 의해 표현되고, 상기Φ는 관측지의 위도, δ는 태양의 적위이다.

Expressed by the following equation, Φ is the latitude of the observation site, δ is the declination of the sun.

The inclination angle control of the solar cell panel may be achieved by adjusting the inclination angle of the solar cell panel to the same angle as the calculated inclination angle of the sun.

According to another embodiment of the present invention for achieving the above object, as a system for controlling the inclination angle of one or more solar cell panel, calculating the shadow length of the solar cell panel based on the altitude of the sun, and calculating Based on the shadow length provided, a system is provided that includes an apparatus for adjusting the inclination angle of the solar cell panel such that the shadow of the solar cell panel does not cover at least a portion of the adjacent solar cell panel.

The shadow length SL of the solar cell panel is calculated by a formula expressed as SL = tan (90 ° -cosh) sin αw, where h is an inclination angle of the sun and α is an inclination angle of the solar panel. , w is the width of the solar cell panel, the inclination angle control of the solar cell panel can be made by determining the α value within the range satisfying SL + (cos αw) ≤ L.

The tilt angle control of the solar cell panel may be achieved by determining the α value to a value as close as possible to the (90 ° -h) value.

According to another embodiment of the present invention for achieving the above object, a system for controlling the solar tracking operation of the solar cell panel, the reference solar radiation measured using a fixed reference solar meter and the solar tracking operation When the difference with the solar tracking solar radiation measured using a solar tracking solar radiation meter provided in the solar cell panel is less than a predetermined value, there is provided a system including a device for stopping the solar tracking operation of the solar cell panel.

According to another embodiment of the present invention for achieving the above object, a system for controlling the tracking progress angle during the solar tracking operation of the solar cell panel, the inclination angle of the sun with respect to the solar cell panel is set to the solar tracking angle A system is provided that includes a device that tilts the solar panel by the solar tracking set angle when twisted by 1/2 of.

On the other hand, according to another embodiment of the present invention for achieving the above object, a computer-readable recording medium for recording a computer program for executing one of the methods can be provided.

According to the present invention, by accurately predicting the inclination angle of the sun for each time by controlling the inclined inclination type solar panel to the optimum inclination angle, it is possible to control to absorb the sunlight to the maximum.

In addition, according to the present invention, it is possible to accurately predict the shadow length for each time of the solar cell panel, thereby solving the problem of lowering the power generation efficiency caused by covering adjacent solar cell panels, and at the same time obtaining the maximum power generation efficiency.

On the other hand, according to the present invention, by determining whether to stop the sun tracking operation by comparing the solar radiation measured by the solar tracking solar meter and the solar radiation meter measured by the reference solar meter, it is possible to determine the exact tracking point of the sun according to the weather have.

In addition, according to the present invention, it is possible to control the solar tracking operation of the solar cell panel is minimized tracking error.

DETAILED DESCRIPTION The following detailed description of the invention refers to the accompanying drawings that show, by way of illustration, specific embodiments in which the invention may be practiced. These embodiments are described in sufficient detail to enable those skilled in the art to practice the invention. It should be understood that the various embodiments of the present invention are different but need not be mutually exclusive. For example, certain shapes, structures, and characteristics described herein may be embodied in other embodiments without departing from the spirit and scope of the invention with respect to one embodiment. It is also to be understood that the position or arrangement of the individual components within each disclosed embodiment may be varied without departing from the spirit and scope of the invention. The following detailed description, therefore, is not to be taken in a limiting sense, and the scope of the present invention, if properly described, is defined only by the appended claims, along with the full range of equivalents to which such claims are entitled. Like reference numerals in the drawings refer to the same or similar functions throughout the several aspects.

Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings so that those skilled in the art can easily implement the present invention.

Configuration of the entire system

2 is a view showing the overall configuration of a system for controlling a solar panel according to an embodiment of the present invention.

As shown in FIG. 2, the entire system of the present invention includes a central control server 110 and at least one local server 130 and a central control server 110 and a local server 130 that can communicate via a network communication network. It may be configured to include one or more solar cell panel 150 controlled by the control of.

First, the network communication network may be configured without regard to communication modes such as wired and wireless, and may include a local area network (LAN), a metropolitan area network (MAN), and a wide area network (WAN). It can be configured with various communication networks. Meanwhile, the network communication network may be a known communication network that enables radio frequency (RF) communication or code division multiple access (CDMA) communication.

The central control server 110 has basic information about each solar cell panel 150 and manages it. The basic information may include information about a solar power station in which the solar cell panel 150 is located. In addition, the central control server 110 collects and displays the status data of the plurality of local servers 130 in various forms and manages them at the same time, and when the abnormality of the local server 130 is detected, the administrator directly measures Do it. To this end, the local server 130 may transmit an alarm signal to a nearby communication base station when an abnormality is detected, and the base station may enable real-time management by transmitting an alarm signal such as a text to an administrator.

Meanwhile, the central control server 110 may control an operation mode of the local server 130. In detail, the control of the inclination angle of the solar cell panel 150 may be automatically performed according to a method described below, or may be made manually by an administrator. Therefore, the central control server 110 may switch the operation mode of the local server 130 to the automatic control mode or the manual control mode, and when the automatic control mode, the central control server 110 and the local server 130 The solar cell panel 150 may be automatically controlled by the cooperative operation. In contrast, when the solar cell panel 150 is in the manual control mode, the manager may directly control the solar cell panel 150.

In addition, the central control server 110 collects and provides data required for an operation required for the local server 130 to control the solar panel 150. The data may include the longitude, latitude, standard time longitude, current time, and the like where the solar panel 150 is located. In addition, parameters such as a tracking setting angle required for sun tracking of the solar cell panel 150 to be described later may be provided.

Meanwhile, the central control server 110 may collect data regarding solar radiation or wind speed in association with the solar radiation meter 170 and the anemometer (not shown), and transmit the data to the local server 130.

The local server 130 performs an operation necessary for controlling the solar cell panel 150 based on data or parameters received from the central control server 110. This operation may include a sun slope operation, a shadow length operation, a relative solar radiation comparison, and the like, and a detailed description of each operation will be described later.

The local server 130 may control the solar panel 150 automatically, or may be switched to manual mode under the control of the central control server 110 to stop the automatic control.

In addition, the local server 130 transmits a current control state, or whether there is an abnormality, to the central control server 110 through a network communication network.

The solar cell panel 150 has the same configuration as a conventional solar cell panel, and may be an inclined solar cell panel whose inclination angle is controlled according to the calculation result of the local server 130. The inclination angle control of the solar cell panel 150 based on the calculation of the local server 130 will be described later in detail.

Hereinafter, the internal configuration of the local server 130 will be described in detail.

Configuration of the local server

3 is a diagram illustrating in detail the internal configuration of the local server 130 in the system according to an embodiment of the present invention.

As shown in FIG. 3, the local server 130 includes a microprocessor 131, a display unit 133, a real time clock (RTC) 135, a memory unit 137, and a communication unit 139. Can be configured. In addition, the local server 130 further includes a driver 134 for adjusting the inclination angle of the solar cell panel 150, and an inclination sensing unit 136 for monitoring the inclination angle control state of the solar cell panel 150. It may be configured.

The microprocessor 131 performs operations required to control the solar panel 150 based on data collected and transmitted by the central control server 110. This operation will be described later in detail.

The display unit 133 displays the current control state such as the inclination angle of the solar cell panel 150 and the presence or absence of an abnormality of the local server 130 in various forms, so that the administrator can monitor in real time.

The RTC 135 is a component for the local server 130 to control itself, and may have a built-in backup battery. According to this, even if communication with the central control server 110 is lost for various reasons, the local server 130 may be controlled by the RTC 135 by itself.

On the other hand, the driving unit 134 serves to generate a driving force for actually adjusting the inclination of the solar cell panel 150. The driving unit 134 may be implemented by a known motor or the like.

In addition, the inclination angle sensing unit 136 may be further provided to sense the inclination angle of the solar panel 150 controlled by the driving unit 134 and monitor the current control state in real time. The inclination angle sensing unit 136 detects the current inclination angle of the solar cell panel 150, and the local server 130 transmits the detected information to the central control server 110 to control the current solar cell panel 150. It enables the management and supervision of managers.

The memory unit 137 stores data or parameters transmitted from the central control server 110 through the communication unit 139. The microprocessor 131 performs operations required for controlling the solar cell panel 150 based on the data stored in the memory unit 137. In addition, the memory unit 137 may store data related to the current state and abnormality of the local server 130. On the other hand, the result of the calculation performed by the microprocessor 131 and the current state of the solar cell panel 150 controlled based on this, for example, of the solar cell panel 150 sensed by the inclination angle sensing unit 136 The current tilt angle may be further stored.

As described above, the communication unit 139 receives data transmitted from the central control server 110 and, conversely, the current state and aspects of the local server 130 stored in the memory unit 137 of the local server 130. Information about the current control state of the battery panel 150 may be transmitted to the central control server 110.

Hereinafter, the control of the solar cell panel 150 using each operation performed in the local server 130 and the result of the operation will be described in detail.

Calculation of the slope angle of the sun and solar panel control using it

In photovoltaic power generation using the gradient solar cell panel 150, when the normal line perpendicular to the horizontal plane of the solar cell panel 150 extends from the center of the solar cell panel 150, the normal line meets the sun. It is important.

That is, controlling the solar cell panel 150 with a slope capable of absorbing sunlight at the maximum is a very important factor in increasing power generation efficiency. For this control, after calculating the inclination time of the sun, it is necessary to control the inclination angle of the solar cell panel 150 accordingly.

The slope time angle refers to the change in altitude of the sun per unit time. That is, since the sun's southern height is 90 °, knowing the inclination time angle of the sun, it is possible to know the altitude of the sun for each time, and the tilt angle of the solar panel 150 can be adjusted using this.

The seasonal appearance of the sun is shown in Figure 4a. At sunrise and sunset, the sun's position coincides with the horizon, so the sun's altitude begins at 0 ° and ends at 90 ° and then again at 0 ° during insolvent time.

In the present invention, a method of calculating the inclination time angle of the sun calculates the sun insolation time, sunrise time, sunset time, and divides it into the sun travel time again to calculate the altitude of the sun at each time. Is done.

The time of day, sunrise time, and sunset time are calculated by the following equation (1).

일남중 시각

One-night time

Sunrise time

Sunset time

Here, E is the difference between the mean time, that is, the difference between the mean solar time and true sun time, and Δλ is the time difference between the standard time and the local mean time of the observation area, which is calculated as (standard time hardness-hardness of observation) / 15 °.

The reason why the differential difference is included in the equation is to calculate more accurate in-day time, sunrise time, and sunset time. The time from the Sun's Sun Moon time to the next Sun Moon's Sun is called Jin Sun Sun. The length of Sun Sun Sun is not always constant and varies slightly every day.

The representative reason is that the sun travels the zodiacal phase without traveling to the equator, as shown in FIG. 4b, and another reason is that the earth is in an elliptical orbit that focuses on the sun as shown in FIG. 4c. Because it runs along. When the earth travels along an elliptic orbit, Kepler's law causes the angular velocity to be the fastest when the earth is near, and the slowest when the earth is at the far point, resulting in uneven angular velocities.

Therefore, the time difference was used to correct the difference in the length of true solar days according to this reason, the exact angle of inclination of the sun can be calculated.

On the other hand, H is expressed as the following equation 2 as the time angle of the sun.

Here, H is the time angle of the sun, Φ is the latitude of the observation site, δ is the declination of the sun, and the value of 0.0145 is the cos90 ° 50 'value, which is the zenith distance at the time of sun entry.

In this manner, when the time of day, sunrise, and sunset are obtained, the angle of inclination of the sun can be obtained. The tilt time angle of the sun is the tilt angle of the sun that changes per unit time. Therefore, the inclination time angle of the sun can be calculated by the following equation (3).

Here, t represents t1 or t2, that is, sunrise time or sunset time.

If we find the angle of inclination in this way, we can calculate the angle of inclination of the sun for each time. For example, if the angle of inclination of the sun is set to 0 ° and is taken as a reference, assuming that the angle of inclination of the sun is 14 ° / h, the time of minus one hour minus one hour plus one hour The angles of inclination of the Sun are computed at 14 ° each.

The inclination angle of the sun computed in this way will be referred to as the "sun inclination calculation angle".

Table 1 shows the above method when the latitude and longitude of the observation station were 35 ° 08 'and 126 ° 55', respectively, and the sunrise time, the sunday time, and the sunset time were 06:09, 12:37, and 19:10, respectively. The calculated solar gradient calculation angle is shown accordingly, and the conventional solar orientation calculation angle is also shown for comparison.

Time Sun slope calculation angle (degrees) Solar bearing angle (degrees) Remarks 06:09 90.00 101.85 Sunrise time 07:00 78.17 94.65 08:00 64.25 86.03 09:00 50.33 76.35 10:00 36.42 64.13 11:00 22.50 46.67 12:00 08.58 20.11 12:36 0.10 12:37 0.00 Ilnam Middle Time 13:00 05.27 13.79 14:00 19.01 42.38 15:00 32.75 61.34 16:00 46.49 74.34 17:00 60.23 84.39 18:00 73.97 93.15 19:10 90.00 103.06 Sunset time

Table 1 shows the result of calculating the inclination angle of the sun by using the inclination time angle of the sun based on the inclination angle of 0 ° when the sun is in the south. Referring to Table 1, the sun tilt calculation angles are calculated at 90 °, 0 °, and 90 °, respectively, at sunrise time, sunset time, and sunday time. On the other hand, the solar azimuth angle is calculated to be 101.85 ° and 103.06 ° at sunrise and sunset times, respectively.

Using the calculated solar inclination angle to calculate the optimal inclination angle of the gradient solar panel 150, and to control the solar panel 150 accordingly, in Table 1, the inclination angle of the sun during the Sunnam 0 ° Since it is assumed that the inclination angle of the solar cell panel 150 is equal to the solar inclination calculation angle, an optimal condition is obtained.

On the other hand, since the altitude of the sun is 0 ° at sunrise time and sunset time, it is natural that the inclination angle of the solar panel 150 should be 90 °. In addition, the angle of inclination of the solar panel 150 should be 0 ° at the time of the day.

Referring back to Table 1, the solar orientation calculation angle calculated by the prior art has problems in controlling the solar panel 150 at an optimal tilt angle, such as values of 101.85 ° and 103.06 ° at sunrise and sunset times, respectively. However, the calculated solar inclination angle calculated in accordance with the present invention is 90 °, 0 °, 90 ° at sunrise time, sunset time, and insolvent time, respectively, thereby controlling the inclination angle of the solar panel 150 In this case, it is possible to control to the most suitable inclination angle in relation to the altitude of the sun.

The microprocessor 131 of the local server 130 uses the longitude, latitude, and time data of the Real Time Clock (RTC) of the observation point received from the central control server 110 to determine the angle of inclination of the sun in the manner described above. And calculating the angle of inclination of the sun. Thereafter, the inclination angle of the solar cell panel 150 is adjusted based on the calculated inclination calculation angle.

4D illustrates an example in which the inclination angle of the solar cell panel 150 is adjusted based on the inclination calculation angle of the sun.

As shown in FIG. 4D, when the inclination calculation angle of the sun is θ, the inclination angle of the solar cell panel 150 is also adjusted to θ. According to this control, when the normal line is extended from the center of the solar cell panel 150, the normal line meets the sun, so that the solar light can be absorbed to the maximum and the efficiency of photovoltaic power generation can be increased. That is, the solar cell panel 150 is controlled to always look at the sun in front, so that sunlight can be absorbed to the maximum.

Backtracking Control by Shadow Length Algorithm

Typically, at least one solar cell panel 150 is provided in a solar power plant. When the solar cell panel 150 is an inclined solar cell panel 150, there is a problem that other solar cell panels 150 may be covered according to the inclination angle. That is, when the gap between the solar panels 150 is not sufficiently maintained due to the limitation of the site size of the solar power plant, the slope of the solar panels 150, or the altitude of the sun, At least a part can be shielded from sunlight.

To prevent this, the local server 130 takes into account the altitude of the sun, so that any solar panel 150 can absorb sunlight as much as possible without blocking adjacent solar panels 150 from sunlight. The solar cell panel 150 is controlled by calculating an inclination angle that can be obtained.

An example illustrating a process of controlling the inclination angles of the plurality of solar panels 150 using the altitude of the sun is illustrated in FIG. 5.

The shadow length SL is expressed by Equation 4 below.

SL = tan (90˚-cosh) (sinαw)

Where h is the altitude of the sun, α is the control tilt angle of the solar panel, and w is the width of the solar panel 150.

h, that is, information about the altitude of the sun may be received from the central control server 110, but the altitude of the sun for each time may be grasped using the inclination time angle of the sun calculated by the above-described method. In other words, after setting the southern midtitude of the sun to 90 °, the altitude of the sun for each time can be calculated using the southern midnight time and the calculated tilt time angle of the sun.

Meanwhile, in FIG. 5, the shadow of the solar panel 150 on the front side (on the left side of the drawing) is not limited to a part of the solar panel 150 behind the back side (on the right side of the drawing). Equation 5 may be established.

SL + (cosαw) ≤L

Here, L is an interval between the solar cell panels 150.

The L value, the w value, and the like may be transmitted in advance from the central control server 110 to the local server 130 and stored in the memory unit 137 of the local server 130.

At least a part of the solar panel 150 should not be blocked from the sun by the shadow of each other, and at the same time, the solar panel 150 should absorb the sunlight to the maximum. To this end, the control inclination angle α of the solar cell panel 150 should be as close as possible to the value of (90 ° − altitude h of the solar cell). That is, the inclination of the solar cell panel 150 should be as close as possible to the value determined using the inclination calculation angle of the sun as described above.

Accordingly, the local server 130 determines the control inclination angle α so that the solar panel 150 may have the inclination closest to the inclination calculation angle of the sun at the present time within a range satisfying Equation 5.

Thereafter, the solar cell panel 150 is controlled according to the determined control angle α.

According to this, the plurality of solar panels 150 are not only blocked from the sun by the shadows of each other, but also can always absorb the maximum sunlight to increase the efficiency of photovoltaic power generation.

Stop solar tracking operation of solar panel by comparing relative solar radiation

In general, the solar cell panel 150 stays at or at an inclination angle that tracks the position of the sun to absorb the maximum sunlight. The method consists of a method of determining the inclination angle for absorbing the maximum solar light as the optimum inclination angle by examining the amount of sunlight absorbed for each inclination angle.

However, since it is difficult to absorb more than a predetermined amount of sunlight in cloudy or rainy weather, meaningless tracking is continuously performed, resulting in power loss due to unnecessary control.

In order to prevent this, in the present invention, the solar tracking operation of the solar cell panel is stopped by comparing the relative solar radiation amount.

FIG. 6 shows a fixed reference solar meter 171 and a solar tracked solar meter 173 as two solar radiation meters 170 provided for such control.

The fixed reference solar radiation meter 171 measures the amount of solar radiation at a fixed position and provides a reference solar radiation amount. In addition, the solar tracking solar radiation meter 173 is provided in the solar cell panel 150 and continuously measures the sun while tracking the sun.

Data about the solar radiation measured by the reference solar meter 171 and the solar tracked solar meter 173 is transmitted to the central control server 110, which is in turn sent to the local server 130.

The microprocessor 131 of the local server 130 compares the solar radiation measured by the reference solar meter 171 with the solar radiation measured by the solar tracking solar meter 173. Thereafter, if the difference between the two solar radiation values is small or insignificant, the solar tracking operation of the solar cell panel 150 is stopped. That is, the fact that there is no difference between the solar radiation measured by the reference solar meter 171 measuring the solar radiation at a fixed position and the solar radiation measured by the solar tracking solar meter 173 does not have any inclination angle. Even though it only absorbs a similar amount of sunlight, it means that solar tracking no longer means stopping sun tracking.

By such a control, the solar cell panel 150 does not perform unnecessary sun tracking operation, thereby minimizing power loss consumed by unnecessary control.

Solar tracking progress angle advance control of solar panels

As described above, the solar cell panel 150 performs a sun tracking control operation for tracking the position of the sun. The sun tracking control operation is not performed at all times. After the sun tracking control operation is finished, the sun tracking control operation is performed again when the sun's altitude is changed by a predetermined size, that is, the tracking set angle.

7A is a schematic diagram for explaining a typical sun tracking control operation. For example, it is assumed that the tracking set angle is 2 '.

Immediately after the solar panel 150 finishes tracking the sun, the altitude of the sun and the inclination angle of the solar panel 150 are the same so that the solar panel 150 is inclined at an optimal inclination angle. Only after the sun's altitude has changed by 2 'will the sun be traced again. Therefore, according to the conventional sun tracking control, the error of 2 'is inevitably maintained.

In order to reduce this error, the present invention uses a solar tracking advance angle advance control method. Referring to Figure 7b will be described the sun tracking advance angle advance control method according to the present invention. In this case, it is also assumed that the tracking set angle is set to 2 '.

The control method according to the present invention moves the solar cell panel 150 by 2 'when the altitude of the sun is shifted by 1' with respect to the solar cell panel 150.

That is, if the inclination angle of the solar cell panel 150 immediately after the sun tracking control operation is at the position of ①, the altitude of the sun is also at the same position at that time. Afterwards, when the sun's altitude is turned by 1 'to be in the position of ②, the solar cell panel 150 is moved by 2' to be in the position of ③ so that it can be moved ahead by 1 'than the sun's altitude.

When the altitude of the sun is again changed by 2 'from this, when the difference between the solar panel 150 and the solar altitude becomes 1', the solar panel 150 is moved by 2 '.

Therefore, the solar cell panel 150 always maintains an error of 1 'with the altitude of the sun, thereby reducing the error in half compared to the prior art, and more efficient solar power generation is possible.

The local server 130 may calculate the altitude of the sun for each time using the tilt time angle of the sun calculated in the above-described manner for the above control. Using the calculated altitude of the sun it is possible to estimate the twist angle between the sun and the solar panel 150.

Embodiments according to the present invention described above may be implemented in the form of program instructions that may be executed by various computer components, and may be recorded in a computer-readable recording medium. The computer-readable recording medium may include program instructions, data files, data structures, etc. alone or in combination. Program instructions recorded on the computer-readable recording medium may be those specially designed and configured for the present invention, or may be known and available to those skilled in the computer software arts. Examples of computer-readable recording media include magnetic media such as hard disks, floppy disks and magnetic tape, optical recording media such as CD-ROMs, DVDs, and magneto-optical media such as floptical disks. media) and hardware devices specifically configured to store and execute program instructions, such as ROM, RAM, flash memory, and the like. Examples of program instructions include not only machine code generated by a compiler, but also high-level language code that can be executed by a computer using an interpreter or the like. The hardware device may be configured to operate as one or more software modules to perform the process according to the invention, and vice versa.

Although the present invention has been described by specific embodiments such as specific components and the like, but the embodiments and the drawings are provided to assist in a more general understanding of the present invention, the present invention is not limited to the above embodiments. For those skilled in the art, various modifications and variations can be made from these descriptions.

Therefore, the spirit of the present invention should not be construed as being limited to the above-described embodiments, and all of the equivalents or equivalents of the claims, as well as the following claims, I will say.

1A is a diagram illustrating solar azimuth angles for each season.

FIG. 1B is a diagram schematically illustrating a method of controlling a solar cell panel using solar seasonal angles of FIG. 1A.

2 is a diagram schematically showing the overall configuration of a system according to an embodiment of the present invention.

3 is a diagram illustrating an internal configuration of a local server in the system of FIG. 2 in detail.

Figure 4a is a diagram showing the appearance of the sun for each season.

4B is a diagram showing the trajectory of the sun's motion with respect to the earth.

4C is a diagram showing an orbit of the earth.

4D illustrates an example of adjusting the inclination angle of the solar cell panel based on the inclination calculation angle of the sun.

5 illustrates an example of a process of controlling a plurality of solar panel tilt angles using the altitude of the sun.

6 shows two solar radiation meters for controlling sun tracking operations in accordance with one embodiment of the present invention.

7A is a schematic diagram illustrating a conventional sun tracking operation control method.

7B is a schematic diagram illustrating a sun tracking operation control method according to an embodiment of the present invention.

<Description of the symbols for the main parts of the drawings>

110: central control server

130: local server

150: solar cell panel

131: microprocessor

133: display unit

135: RTC

137: memory

139: communication unit

170: solar radiation meter

171: reference solar meter

173: Solar Tracking Solar Meter

Claims (24)

delete delete delete delete delete delete As a method for controlling the inclination angle of at least one solar cell panel, Calculating the shadow length of the solar panel based on the height of the sun, and Based on the calculated shadow length, adjusting the inclination angle of the solar cell panel such that the shadow of the solar cell panel does not cover at least a portion of the adjacent solar cell panel. The method of claim 7, wherein In calculating the shadow length of the solar cell panel, the shadow length SL of the solar cell panel is calculated by a formula expressed by SL = tan (90 ° -cosh) sin αw, and the h Is the inclination angle of the sun, α is the inclination angle of the solar panel, w is the width of the solar panel, Adjusting the inclination angle of the solar cell panel, And determining the α value within a range satisfying SL + (cosαw) ≦ L. The method of claim 8, Adjusting the inclination angle of the solar cell panel, And determining the α value to a value as close as possible to a value of (90 ° -h). delete delete delete delete delete delete delete delete A system for controlling the inclination angle of at least one solar cell panel, Calculates the shadow length of the solar panel based on the altitude of the sun, and based on the calculated shadow length, the shadow of the solar cell panel does not cover at least a portion of the adjacent solar cell panel. An inclination angle control system of a solar cell panel including a device for adjusting an inclination angle. The method of claim 18, The shadow length SL of the solar cell panel is calculated by a formula expressed as SL = tan (90 ° -cosh) sin αw, where h is an inclination angle of the sun and α is an inclination angle of the solar panel. , w is the width of the solar panel, The inclination angle control of the solar cell panel is performed by determining an α value within a range satisfying SL + (cosαw) ≦ L. The method of claim 19, The inclination angle control of the solar cell panel is performed by determining the α value to a value as close as possible to the value of (90 ° -h). delete delete A computer-readable recording medium for recording a computer program for executing the method of any one of claims 7 to 9. delete

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