WO2022166522A1

WO2022166522A1 - Photovoltaic tracking support control method, photovoltaic tracking controller, and photovoltaic tracking system

Info

Publication number: WO2022166522A1
Application number: PCT/CN2022/070663
Authority: WO
Inventors: 倪华; 陈鹏; 马祥茂; 韦亮亮
Original assignee: 阳光电源股份有限公司
Priority date: 2021-02-03
Filing date: 2022-01-07
Publication date: 2022-08-11
Also published as: CN112817341A; CN112817341B

Abstract

Disclosed in the present invention are a photovoltaic tracking support control method, a photovoltaic tracking controller, and a photovoltaic tracking system. The method comprises obtaining photovoltaic tracking-related information, the photovoltaic tracking-related information comprising an alternating current power state, electric parameters, and a photovoltaic tracking support tracking command of a photovoltaic inverter; when the alternating current power state is an alternating current power limiting state, and the photovoltaic tracking support tracking command is a tracking support anti-tracking command, generating, according to the photovoltaic tracking-related information, a first control instruction for reducing an illumination angle of incidence; and controlling, according to the first control instruction, a photovoltaic tracking support to reversely track and rotate to reduce an illumination angle of incidence. In the present invention, when the photovoltaic inverter is in the alternating current power limiting state, and a direct current working voltage of the photovoltaic inverter exceeds a threshold voltage, the photovoltaic tracking support is controlled to reversely track and rotate to reduce the illumination angle of incidence, such that the power of a photovoltaic module mounted on the photovoltaic tracking support is appropriately decreased, and a direct current voltage of the photovoltaic inverter is reduced, thereby preventing the direct current voltage of the photovoltaic inverter from being too high.

Description

Photovoltaic tracking support control method, photovoltaic tracking controller and photovoltaic tracking system

technical field

This application claims the priority of the domestic application filed with the China Patent Office on February 3, 2021, the application number is 202110150065.4, and the invention name is "Photovoltaic Tracking Support Control Method, Photovoltaic Tracking Controller and Photovoltaic Tracking System", the entire contents of which are approved by Reference is incorporated in this application.

Background technique

In the photovoltaic power generation system, the working principle of the commonly used solar tracker is: according to the latitude and longitude of the installation location of the solar panel, calculate the angle of the sun's rays at different times of each day of the year, The ray angle is stored in the controller of the tracking system, and the sun tracking control is realized according to the sun ray angle at each moment according to the installation position of the solar panel. The method is a sun tracking control method based on astronomical information to calculate the angle of the sun's rays.

When designing a photovoltaic power station, considering the best investment-return ratio, usually the rated capacity configuration of the DC side components of the photovoltaic power station will exceed the rated capacity configuration of the AC side components, so that when the light is good, the photovoltaic inverter can be used earlier. When running at full load to generate power, at this time, the power of the photovoltaic modules may be limited by the AC power of the photovoltaic inverter, and the maximum power is not output. However, due to the characteristics of the photovoltaic module itself, when the photovoltaic module does not reach the maximum power, the DC voltage of the photovoltaic module will be higher than the maximum power point voltage. Among them, V1 is the maximum power point voltage of PV (Photovoltaic, photovoltaic), namely MPP (Maximum Power Point maximum power point). When the AC power of the PV inverter is limited, the DC voltage of the PV module shifts to the right of the MPP point, such as In Fig. 1, V2, V2>V1, at this time, the DC voltage of the photovoltaic inverter is raised.

However, when the DC voltage of the photovoltaic inverter is too high, it will increase the risk of overvoltage of the power semiconductors inside the photovoltaic inverter. This will cause the PV inverter to heat up, thereby reducing the service life of the internal components of the PV inverter.

SUMMARY OF THE INVENTION

In view of this, the present invention discloses a photovoltaic tracking bracket control method, a photovoltaic tracking controller and a photovoltaic tracking system, so as to realize, without increasing the hardware cost, when the photovoltaic inverter is in an AC power limit state, and the photovoltaic inverter When the DC working voltage of the inverter exceeds the threshold voltage, the incident angle of light is reduced by controlling the reverse tracking rotation of the photovoltaic tracking bracket, so that the power of the photovoltaic modules installed on the photovoltaic tracking bracket is appropriately reduced, and the DC voltage of the photovoltaic inverter is reduced at this time. , to avoid the high DC voltage of the photovoltaic inverter, effectively reduce the overvoltage risk of the power semiconductors inside the photovoltaic inverter, and improve the service life of the internal components of the photovoltaic inverter.

A photovoltaic tracking support control method is applied to a photovoltaic tracking controller, and the control method includes:

Obtaining photovoltaic tracking related information, the photovoltaic tracking related information includes: the AC power state of the photovoltaic inverter, the electrical parameters and the photovoltaic tracking support tracking command;

When the AC power state is the AC power-limited state, and the photovoltaic tracking support tracking command is a tracking support anti-tracking command, a first control command for reducing the incident angle of illumination is generated according to the photovoltaic tracking related information, wherein the The tracking bracket anti-tracking command is generated when the DC operating voltage of the photovoltaic inverter exceeds the threshold voltage;

The photovoltaic tracking support is controlled to reversely track and rotate according to the first control instruction to reduce the incident angle of illumination.

Optionally, also include:

When the AC power state is the AC power limit state, and the photovoltaic tracking support tracking command is a tracking support loss reduction command, a second control command for reducing photovoltaic system loss is generated according to the photovoltaic tracking related information, wherein, The tracking bracket loss reduction command is generated when the DC operating voltage of the photovoltaic inverter does not exceed the threshold voltage;

According to the second control instruction, the photovoltaic tracking bracket is controlled to reduce the rotation tracking frequency or the tracking angle of the photovoltaic tracking bracket is controlled to remain unchanged.

Optionally, when the AC power of the photovoltaic inverter reaches the maximum limit power, the AC power state of the photovoltaic inverter is switched to the AC limited power state;

Alternatively, when the photovoltaic inverter receives the power scheduling instruction sent by the background server, the AC power state of the photovoltaic inverter is switched to the AC power limited state.

Optionally, also include:

When the AC power state is an AC normal power state, and the photovoltaic tracking support tracking command is a tracking support normal tracking command, generating a third control command for tracking the optimal illumination incident angle according to the photovoltaic tracking related information;

According to the third control instruction, the photovoltaic tracking support is controlled to perform optimal illumination incident angle tracking.

A photovoltaic tracking controller, comprising:

an acquisition unit, configured to acquire photovoltaic tracking related information, the photovoltaic tracking related information includes: the AC power state of the photovoltaic inverter, the electrical parameters and the photovoltaic tracking support tracking command;

A first control command generation unit, configured to generate a signal that reduces the incident angle of illumination according to the photovoltaic tracking related information when the AC power state is an AC power-limited state and the photovoltaic tracking support tracking command is a tracking support anti-tracking command. a first control command, wherein the tracking support anti-tracking command is generated when the DC operating voltage of the photovoltaic inverter exceeds a threshold voltage;

The first control unit is configured to control the photovoltaic tracking support to reversely track and rotate according to the first control instruction, so as to reduce the incident angle of illumination.

Optionally, also include:

A second control command generating unit, configured to generate a photovoltaic system with reduced power according to the photovoltaic tracking related information when the AC power state is the AC power limited state and the photovoltaic tracking support tracking command is a tracking support loss reduction command a second loss control command, wherein the tracking bracket loss reduction command is generated when the DC operating voltage of the photovoltaic inverter does not exceed the threshold voltage;

The second control unit is configured to control the photovoltaic tracking support to reduce the rotation tracking frequency or control the tracking angle of the photovoltaic tracking support to remain unchanged according to the second control instruction.

Optionally, also include:

A third control command generating unit, configured to generate an optimal illumination incident angle according to the photovoltaic tracking related information when the AC power state is the AC normal power state and the photovoltaic tracking support tracking command is the tracking support normal tracking command Tracked third control instructions;

A third control unit, configured to control the photovoltaic tracking support to perform optimal illumination incident angle tracking according to the third control instruction.

A photovoltaic tracking system, comprising: a photovoltaic inverter, a data collector, a photovoltaic tracking bracket, a photovoltaic assembly, and the photovoltaic tracking controller described above;

The data collector is respectively connected with the photovoltaic inverter and the photovoltaic tracking controller, and the data collector is configured to send photovoltaic tracking related information to the photovoltaic tracking controller, and the photovoltaic tracking related information includes: Describe the AC power status, electrical parameters and PV tracking support tracking commands of the PV inverter;

The photovoltaic tracking controller is connected with the photovoltaic tracking bracket, the photovoltaic component is installed on the photovoltaic tracking bracket, the photovoltaic component is connected to the photovoltaic inverter, and the photovoltaic tracking controller is used to complete all the steps. The control of the rotation of the photovoltaic tracking support, when the AC power state is the AC power limit state, and the photovoltaic tracking support tracking command is the tracking support anti-tracking command, according to the photovoltaic tracking related information to reduce the illumination incident angle. a control instruction, according to the first control instruction to control the reverse tracking rotation of the photovoltaic tracking support to reduce the incident angle of light, wherein the tracking support reverse tracking command is performed when the DC operating voltage of the photovoltaic inverter exceeds a threshold voltage generated when.

Optionally, the photovoltaic inverter is configured to send initial photovoltaic tracking related information at least including the AC power state and the electrical parameter to the data collector;

The data collector is configured to determine whether the initial photovoltaic tracking related information includes the tracking bracket anti-tracking command when the AC power state is the AC power-limited state, and if so, correlate the initial photovoltaic tracking The information is sent to the photovoltaic tracking controller as the photovoltaic tracking related information, if not, when the DC working voltage of the photovoltaic inverter in the electrical parameter exceeds the threshold voltage, the tracking bracket is generated. tracking command, and sending the initial photovoltaic tracking related information together with the tracking bracket anti-tracking command as the photovoltaic tracking related information to the photovoltaic tracking controller.

Optionally, the data collector is also used for:

When the AC power state is the AC power limit state, determine whether the initial photovoltaic tracking related information includes a tracking bracket loss reduction command, and if so, send the initial photovoltaic tracking related information as the photovoltaic tracking related information to The photovoltaic tracking controller, if not, generates the tracking bracket loss reduction command when the DC operating voltage of the photovoltaic inverter does not exceed the threshold voltage, and combines the initial photovoltaic tracking related information with all the relevant information. The tracking bracket loss reduction command is sent to the photovoltaic tracking controller as the photovoltaic tracking related information.

Optionally, the photovoltaic tracking related information further includes: the latitude and longitude position of the photovoltaic power station and current weather information.

Optionally, the photovoltaic tracking controller is also used for:

Directly receive the latitude and longitude position of the photovoltaic power station and the current weather information sent by the background server;

or,

The latitude and longitude position of the photovoltaic power station and the current weather information sent by the background server are received by the data collector.

Optionally, the photovoltaic tracking controller includes: a photovoltaic tracking master controller and a photovoltaic tracking slave controller;

The photovoltaic tracking master controller is respectively connected with the data collector and the photovoltaic tracking slave controller, and the photovoltaic tracking slave controller is connected with the photovoltaic tracking support;

The photovoltaic tracking master controller is configured to receive the photovoltaic tracking related information sent by the data collector, and when the AC power state is the AC power limited state, and the photovoltaic tracking support tracking command is the tracking support reverse. When tracking a command, the first control instruction is generated according to the photovoltaic tracking related information, and the first control instruction is sent to the photovoltaic tracking slave controller;

The photovoltaic tracking slave controller controls the photovoltaic tracking support to reversely track and rotate according to the first control instruction to reduce the incident angle of illumination.

Optionally, the photovoltaic tracking master controller is further configured to receive the photovoltaic tracking related information, and forward the photovoltaic tracking related information to the photovoltaic tracking slave controller;

The photovoltaic tracking slave controller is configured to generate the first photovoltaic tracking-related information according to the photovoltaic tracking related information when the AC power state is the AC power-limited state and the photovoltaic tracking support tracking command is a tracking support anti-tracking command. control instructions, and control the photovoltaic tracking support to reversely track and rotate according to the first control instructions to reduce the incident angle of illumination.

Optionally, the overall photovoltaic tracking controller is further configured to, when the AC power state is the AC power limited state, and the photovoltaic tracking support tracking command is a tracking support loss reduction command, according to the photovoltaic tracking correlation The information generates a second control command for reducing the loss of the photovoltaic system, and sends the second control command to the photovoltaic tracking slave controller, wherein the tracking bracket loss reduction command is in the DC of the photovoltaic inverter. Generated when the operating voltage does not exceed the threshold voltage;

The photovoltaic tracking slave controller controls the photovoltaic tracking bracket to reduce the rotation tracking frequency according to the second control instruction or controls the tracking angle of the photovoltaic tracking bracket to maintain the same.

The photovoltaic tracking slave controller is further configured to generate, according to the photovoltaic tracking related information, when the AC power state is the AC power-limited state and the photovoltaic tracking support tracking command is the tracking support loss reduction command the second control instruction, and control the photovoltaic tracking support to reduce the rotation tracking frequency or control the tracking angle of the photovoltaic tracking support to remain unchanged according to the second control instruction.

Optionally, the photovoltaic inverter includes any one of a string inverter, a centralized inverter, a combiner box, and an intelligent combiner box including a DC/DC conversion unit.

As can be seen from the above technical solutions, the present invention discloses a photovoltaic tracking support control method, a photovoltaic tracking controller and a photovoltaic tracking system, and obtains photovoltaic tracking related information, and the photovoltaic tracking related information includes the AC power state of the photovoltaic inverter and the electrical parameters. and the photovoltaic tracking bracket tracking command, when the AC power state is the AC power limit state, and the photovoltaic tracking bracket tracking command is the tracking bracket anti-tracking command, the first control command to reduce the incident angle of the light is generated according to the photovoltaic tracking related information. A control command controls the photovoltaic tracking bracket to reversely track and rotate to reduce the incident angle of light. It can be seen that the present invention, without increasing the hardware cost, controls the photovoltaic tracking bracket to reversely track and rotate when the photovoltaic inverter is in the AC power-limited state and the DC operating voltage of the photovoltaic inverter exceeds the threshold voltage. Reduce the incident angle of light, so that the power of the photovoltaic modules installed on the photovoltaic tracking bracket is appropriately reduced, reducing the DC voltage of the photovoltaic inverter at this time, avoiding the high DC voltage of the photovoltaic inverter, and effectively reducing the internal power of the photovoltaic inverter The risk of overvoltage in semiconductors can increase the service life of the internal components of the photovoltaic inverter.

Description of drawings

In order to explain the embodiments of the present invention or the technical solutions in the prior art more clearly, the following briefly introduces the accompanying drawings that need to be used in the description of the embodiments or the prior art. Obviously, the accompanying drawings in the following description are only It is an embodiment of the present invention. For those of ordinary skill in the art, other drawings can also be obtained according to the disclosed drawings without creative efforts.

Figure 1 is a schematic diagram of the corresponding relationship between the voltage and power of a photovoltaic module;

2 is a flowchart of a method for controlling a photovoltaic tracking support disclosed in an embodiment of the present invention;

3 is a flowchart of another photovoltaic tracking support control method disclosed in an embodiment of the present invention;

4 is a schematic structural diagram of a photovoltaic tracking controller disclosed in an embodiment of the present invention;

FIG. 5 is a schematic structural diagram of a photovoltaic tracking system disclosed in an embodiment of the present invention.

Detailed ways

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, but not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

Embodiments of the present invention disclose a photovoltaic tracking bracket control method, photovoltaic tracking controller and photovoltaic tracking system, so as to realize that when the photovoltaic inverter is in an AC power limit state, and the photovoltaic inverter When the DC working voltage exceeds the threshold voltage, the incident angle of light is reduced by controlling the reverse tracking rotation of the photovoltaic tracking bracket, so that the power of the photovoltaic modules installed on the photovoltaic tracking bracket is appropriately reduced, and the DC voltage of the photovoltaic inverter at this time is reduced. Avoid the high DC voltage of the photovoltaic inverter, effectively reduce the overvoltage risk of the power semiconductors inside the photovoltaic inverter, and improve the service life of the internal components of the photovoltaic inverter.

Referring to FIG. 2 , a flowchart of a method for controlling a photovoltaic tracking support disclosed in an embodiment of the present invention, the method is applied to a photovoltaic tracking controller, and the control method includes:

Step S101, obtaining photovoltaic tracking related information;

In this embodiment, the photovoltaic tracking related information may include: the AC power state of the photovoltaic inverter, the electrical parameters, and the photovoltaic tracking support tracking command.

The electrical parameters may include: AC power, AC voltage, AC current, DC power, DC working voltage and DC working current of the photovoltaic inverter.

In practical applications, the photovoltaic tracking related information may further include: the current angle of the photovoltaic tracking bracket, the latitude and longitude position of the photovoltaic power station, and the current weather information.

It should be noted that the AC power state, electrical parameters of the photovoltaic inverter and the tracking command of the photovoltaic tracking support are sent by the data collector to the photovoltaic tracking controller. The latitude and longitude position of the photovoltaic power station and the current weather information can be sent by the background server to the data collector, and then forwarded by the data collector to the photovoltaic tracking controller, or directly sent by the background server to the photovoltaic tracking controller.

Step S102: When the AC power state of the photovoltaic inverter is the AC power limit state, and the photovoltaic tracking support tracking command is a tracking support anti-tracking command, generate a first control for reducing the incident angle of illumination according to the photovoltaic tracking related information instruction;

Wherein, the tracking bracket anti-tracking command is generated when the DC operating voltage of the photovoltaic inverter exceeds the threshold voltage. The value of the threshold voltage is determined according to actual needs, which is not limited in the present invention.

In practical applications, when the AC power of the photovoltaic inverter does not reach the maximum limit power, the AC power state is the AC normal power state. When the AC power of the PV inverter reaches the maximum limit power, the AC power state of the PV inverter switches to the AC power limit state; or, when the PV inverter receives the power scheduling command sent by the background server, the PV inverter The AC power state of the inverter is switched to the AC power limited state.

When the AC power state is the AC power limit state, the PV inverter or data collector determines whether the DC operating voltage of the PV inverter exceeds the threshold voltage. If so, the PV inverter or data collector generates a tracking bracket backtracking command, and send the tracking bracket anti-tracking command to the photovoltaic tracking controller. The photovoltaic tracking controller determines that when the AC power state is the AC power limit state and the photovoltaic tracking bracket tracking command is the tracking bracket anti-tracking command, according to the photovoltaic tracking The relevant information generates a first control instruction for reducing the incident angle of illumination.

Step S103 , controlling the photovoltaic tracking support to reversely track and rotate according to the first control instruction to reduce the incident angle of illumination.

To sum up, the present invention discloses a photovoltaic tracking support control method to obtain photovoltaic tracking related information. The photovoltaic tracking related information includes the AC power state of the photovoltaic inverter, the electrical parameters and the photovoltaic tracking support tracking command. When the AC power state is In the AC power-limited state, and the photovoltaic tracking support tracking command is the tracking support anti-tracking command, a first control command for reducing the incident angle of illumination is generated according to the photovoltaic tracking related information, and the photovoltaic tracking support is controlled to reversely track and rotate according to the first control command. Decrease the angle of incidence of the light. It can be seen that the present invention, without increasing the hardware cost, controls the photovoltaic tracking bracket to reversely track and rotate when the photovoltaic inverter is in the AC power-limited state and the DC operating voltage of the photovoltaic inverter exceeds the threshold voltage. Reduce the incident angle of light, so that the power of the photovoltaic modules installed on the photovoltaic tracking bracket is appropriately reduced, reducing the DC voltage of the photovoltaic inverter at this time, avoiding the high DC voltage of the photovoltaic inverter, and effectively reducing the internal power of the photovoltaic inverter The risk of overvoltage in semiconductors can increase the service life of the internal components of the photovoltaic inverter.

As the power of the PV modules decreases, the DC working voltage of the PV inverter in the AC power limit state will gradually decrease. When the DC working voltage of the PV inverter does not exceed the threshold voltage, the PV inverter generates a tracking bracket to reduce the loss. command, and send the AC power limit state and tracking bracket loss reduction command to the data collector, and then the data collector sends it to the photovoltaic tracking controller. Alternatively, the PV inverter sends the AC power limit state and its own DC working voltage to the data collector. When the data collector determines that the DC working voltage of the PV inverter does not exceed the threshold voltage, it generates a tracking bracket loss reduction command, and Send the AC power limit status and tracking bracket loss reduction commands to the PV tracking controller.

Therefore, in order to further optimize the above embodiment, referring to FIG. 3 , a flowchart of a method for controlling a photovoltaic tracking support disclosed in another embodiment of the present invention, on the basis of the embodiment shown in FIG. 2 , after step S101 , it may further include: :

Step S104, when the AC power state is the AC power limit state, and the photovoltaic tracking support tracking command is the tracking support loss reduction command, generate a second control command for reducing the loss of the photovoltaic system according to the photovoltaic tracking related information;

Wherein, the tracking bracket loss reduction command is generated when the DC operating voltage of the photovoltaic inverter does not exceed the threshold voltage.

Step S105 , controlling the photovoltaic tracking support to reduce the rotational tracking frequency or controlling the tracking angle of the photovoltaic tracking support to remain unchanged according to the second control instruction.

To sum up, the present invention can control the photovoltaic tracking bracket to reversely track and rotate when the photovoltaic inverter is in the AC power limit state and the DC operating voltage of the photovoltaic inverter exceeds the threshold voltage without increasing the hardware cost. Reduce the incident angle of light, so that the power of the photovoltaic modules installed on the photovoltaic tracking bracket is appropriately reduced, reducing the DC voltage of the photovoltaic inverter at this time, avoiding the high DC voltage of the photovoltaic inverter, and effectively reducing the internal power of the photovoltaic inverter The risk of overvoltage in semiconductors can increase the service life of the internal components of the photovoltaic inverter.

In addition, in the present invention, when the photovoltaic inverter is in the AC power-limited state and the DC working voltage of the photovoltaic inverter does not exceed the threshold voltage, the photovoltaic tracking bracket is controlled to reduce the rotation tracking frequency or the tracking angle of the photovoltaic tracking bracket is controlled to remain unchanged. , to reduce the loss of the photovoltaic system caused by the photovoltaic tracking bracket tracking the sun's rays again.

When the output power of the PV inverter decreases with the input power and the PV inverter is no longer in the AC power limit state, the PV inverter switches from the AC power limit state to the AC normal power state, and the PV inverter passes the data The collector sends the AC normal power state to the photovoltaic tracking controller, and the photovoltaic tracking controller controls the photovoltaic tracking bracket to track the optimal light incident angle.

Therefore, in order to further optimize the above embodiment, after step S101, it may further include:

When the AC power state is the AC normal power state, and the photovoltaic tracking support tracking command is the tracking support normal tracking command, the third control command for tracking the optimal light incident angle is generated according to the photovoltaic tracking related information;

Corresponding to the above method embodiments, the present invention also discloses a photovoltaic tracking controller.

Referring to FIG. 4 , a schematic structural diagram of a photovoltaic tracking controller disclosed in an embodiment of the present invention, the photovoltaic tracking controller may include:

The obtaining unit 201 is configured to obtain photovoltaic tracking related information, where the photovoltaic tracking related information includes: the AC power state of the photovoltaic inverter, the electrical parameters and the photovoltaic tracking support tracking command;

The first control command generation unit 202 is configured to generate a reduced illumination incident angle according to the photovoltaic tracking related information when the AC power state is an AC power limited state and the photovoltaic tracking support tracking command is a tracking support anti-tracking command the first control instruction;

Wherein, the tracking bracket anti-tracking command is generated when the DC operating voltage of the photovoltaic inverter exceeds a threshold voltage.

The first control unit 203 is configured to control the photovoltaic tracking support to reversely track and rotate according to the first control instruction to reduce the incident angle of illumination.

In summary, the present invention discloses a photovoltaic tracking controller, which obtains photovoltaic tracking related information, and the photovoltaic tracking related information includes the AC power state of the photovoltaic inverter, the electrical parameters and the photovoltaic tracking bracket tracking command. When the AC power state is AC In a power-limited state, and the photovoltaic tracking support tracking command is a tracking support anti-tracking command, a first control command for reducing the incident angle of illumination is generated according to the photovoltaic tracking related information, and the photovoltaic tracking support is controlled to reversely track and rotate according to the first control command. Light incidence angle. It can be seen that the present invention, without increasing the hardware cost, controls the photovoltaic tracking bracket to reversely track and rotate when the photovoltaic inverter is in the AC power-limited state and the DC operating voltage of the photovoltaic inverter exceeds the threshold voltage. Reduce the incident angle of light, so that the power of the photovoltaic modules installed on the photovoltaic tracking bracket is appropriately reduced, reducing the DC voltage of the photovoltaic inverter at this time, avoiding the high DC voltage of the photovoltaic inverter, and effectively reducing the internal power of the photovoltaic inverter The risk of overvoltage in semiconductors can increase the service life of the internal components of the photovoltaic inverter.

Therefore, to further optimize the above embodiments, the photovoltaic tracking controller may further include:

A second control command generation unit, configured to generate a photovoltaic system loss reduction command according to the photovoltaic tracking related information when the AC power state is the AC power limited state and the photovoltaic tracking support tracking command is a tracking support loss reduction command. a second control instruction, wherein the tracking bracket loss reduction command is generated when the DC operating voltage of the photovoltaic inverter does not exceed the threshold voltage;

Corresponding to the above embodiments, the present invention also discloses a photovoltaic tracking system.

Referring to FIG. 5 , a schematic structural diagram of a photovoltaic tracking system disclosed in an embodiment of the present invention, the photovoltaic tracking system includes: a photovoltaic inverter 301 , a data collector 302 , a photovoltaic tracking bracket 303 , a photovoltaic module 304 and the embodiment shown in FIG. 3 Photovoltaic tracking controller 305 in .

in:

The data collector 302 is respectively connected to the photovoltaic inverter 301 and the photovoltaic tracking controller 305 , and the data collector 302 is configured to send photovoltaic tracking related information to the photovoltaic tracking controller 305 .

The photovoltaic tracking related information includes: the AC power state of the photovoltaic inverter, electrical parameters, and photovoltaic tracking support tracking commands.

It should be noted that the photovoltaic inverter 301 may include any one of a string inverter, a centralized inverter, a combiner box, and an intelligent combiner box containing a DC/DC (Direct Current, direct current converter) conversion unit .

The photovoltaic tracking controller 305 is connected to the photovoltaic tracking support 303 , the photovoltaic assembly 304 is mounted on the photovoltaic tracking support 303 , and the photovoltaic assembly 304 is connected to the photovoltaic inverter 301 .

Wherein, the photovoltaic inverter 301 can directly communicate with the tracking controller of the photovoltaic module 304 connected to the photovoltaic inverter 301, or through PLC (Programmable Logic Controller, programmable logic controller), or RS485, or Ethernet, or wireless WiFi, or LoRa for data transmission.

The photovoltaic tracking controller 305 is used to complete the control of the rotation of the photovoltaic tracking support. When the AC power state is an AC power-limited state, and the photovoltaic tracking support tracking command is a tracking support anti-tracking command, according to the The photovoltaic tracking related information generates a first control command for reducing the incident angle of illumination, and controls the photovoltaic tracking bracket 303 to reversely track and rotate according to the first control command to reduce the incident angle of illumination, wherein the tracking bracket reverse tracking command is in It is generated when the DC operating voltage of the photovoltaic inverter 301 exceeds the threshold voltage.

To sum up, the present invention discloses a photovoltaic tracking system, including: photovoltaic inverter 301, data collector 302, photovoltaic tracking bracket 303, photovoltaic module 304, photovoltaic tracking controller 305, photovoltaic tracking controller 305 to obtain photovoltaic tracking Related information, photovoltaic tracking related information includes the AC power state of the photovoltaic inverter, electrical parameters and the photovoltaic tracking support tracking command. When the AC power state is the AC power limit state, and the photovoltaic tracking support tracking command is the tracking support anti-tracking command, A first control command for reducing the incident angle of illumination is generated according to the photovoltaic tracking related information, and the photovoltaic tracking bracket 303 is controlled to reversely track and rotate according to the first control command to reduce the incident angle of illumination. It can be seen that the present invention does not increase the hardware cost, when the photovoltaic inverter 301 is in the AC power limit state, and the DC operating voltage of the photovoltaic inverter 301 exceeds the threshold voltage, the photovoltaic tracking bracket 303 is controlled to reverse the direction Tracking the rotation to reduce the incident angle of light, so that the power of the photovoltaic modules 304 installed on the photovoltaic tracking bracket 303 is appropriately reduced, the DC voltage of the photovoltaic inverter 301 is reduced at this time, and the DC voltage of the photovoltaic inverter 301 is prevented from being too high. The risk of overvoltage of the power semiconductors inside the photovoltaic inverter 301 is reduced, and the service life of the components inside the photovoltaic inverter 301 can be improved.

In order to facilitate the determination of the rotation angle of the photovoltaic tracking support 303, in practical applications, an angle sensor 306 is also installed on the photovoltaic tracking support 303, and the angle sensor 306 feeds back the collected real-time rotation angle of the photovoltaic tracking support 303 to the photovoltaic tracking controller 305. , the photovoltaic tracking controller 305 controls the photovoltaic tracking support 303 according to the real-time rotation angle of the photovoltaic tracking support 303 .

Among them, the photovoltaic tracking bracket includes: a bracket, a rotating mechanical structure, a motor and a power distribution box. The power distribution box contains circuits and devices such as power supply, communication reception and transmission, instruction processing and calculation required to complete the rotation of the bracket. For the specific structural composition of the photovoltaic tracking support, reference may be made to the existing mature solutions, which will not be repeated here.

It should be particularly noted that, in practical applications, the tracking support anti-tracking command may be generated by the photovoltaic inverter 301 or generated by the data collector 302 . When the tracking bracket anti-tracking command is generated by the photovoltaic inverter 301, the initial photovoltaic tracking related information sent by the photovoltaic inverter 301 to the data collector 302 will include the photovoltaic tracking bracket tracking command. On the contrary, when the tracking bracket anti-tracking command is generated by When the data collector 302 generates, the initial photovoltaic tracking related information sent by the photovoltaic inverter 301 to the data collector 302 does not include the tracking bracket anti-tracking command.

The photovoltaic inverter 301 is configured to send to the data collector 302 the initial photovoltaic tracking related information at least including the AC power state and the electrical parameter.

The data collector 302 is configured to determine whether the initial photovoltaic tracking related information includes the tracking bracket anti-tracking command when the AC power state is the AC power limited state, and if so, the initial photovoltaic tracking related information As the photovoltaic tracking related information, it is sent to the photovoltaic tracking controller 305, if not, when the DC operating voltage of the photovoltaic inverter in the electrical parameter exceeds the threshold voltage, the tracking bracket feedback is generated. tracking command, and send the initial photovoltaic tracking related information together with the tracking support anti-tracking command to the photovoltaic tracking controller 305 as the photovoltaic tracking related information.

Wherein, between the photovoltaic inverter 301 and the data collector 302, data transmission can be performed by any one of PLC, RS485 and Ethernet.

Between the data collector 302 and the photovoltaic tracking controller 305, data transmission can be performed by any one of PLC, RS485 and Ethernet.

It should be noted that, in practical applications, the tracking bracket loss reduction command can be generated by the photovoltaic inverter 301 or by the data collector 302. When the tracking bracket loss reduction command is generated by the photovoltaic inverter 301, the initial photovoltaic tracking related information sent by the photovoltaic inverter 301 to the data collector 302 will include the tracking bracket loss reduction command. On the contrary, when the tracking bracket loss reduction command is generated by When the data collector 302 generates, the initial photovoltaic tracking related information sent by the photovoltaic inverter 301 to the data collector 302 does not include the tracking bracket loss reduction command.

The data collector 302 can also be used to: when the AC power state is the AC power-limited state, determine whether the initial photovoltaic tracking related information includes a tracking bracket loss reduction command, and if so, record the initial photovoltaic tracking related information. The photovoltaic tracking related information is sent to the photovoltaic tracking controller 305, if not, when the DC operating voltage of the photovoltaic inverter does not exceed the threshold voltage, the tracking bracket loss reduction command is generated, and The initial photovoltaic tracking related information together with the tracking bracket loss reduction command is sent to the photovoltaic tracking controller 305 as the photovoltaic tracking related information.

In the above embodiment, the photovoltaic tracking related information obtained by the photovoltaic tracking controller 305 further includes: the latitude and longitude position of the photovoltaic power station and the current weather information.

Specifically, the photovoltaic tracking controller 305 can also be used for:

Directly receive the latitude and longitude position of the photovoltaic power station and the current weather information sent by the background server 307;

or,

The latitude and longitude position of the photovoltaic power station and the current weather information sent by the background server 307 are received through the data collector 302 .

As shown in FIG. 5 , the photovoltaic tracking controller 305 may include: a photovoltaic tracking master controller 3051 and a photovoltaic tracking slave controller 3052;

The photovoltaic tracking master controller 3051 is respectively connected with the data collector 302 and the photovoltaic tracking slave controller 3052 , and the photovoltaic tracking slave controller 3052 is connected with the photovoltaic tracking support 303 .

It should be noted that, in practical applications, the first control command for controlling the PV tracking support 303 may be generated by the PV tracking master controller 3051 or the PV tracking slave controller 3052 .

(1) When the first control command for controlling the PV tracking support 303 is generated by the PV tracking master controller 3051, the details are as follows:

The photovoltaic tracking master controller 3051 is configured to receive the photovoltaic tracking related information sent by the data collector 302, and when the AC power state is the AC power limited state, and the photovoltaic tracking support tracking command is When tracking the support anti-tracking command, the first control instruction is generated according to the photovoltaic tracking related information, and the first control instruction is sent to the photovoltaic tracking slave controller 3052;

The photovoltaic tracking slave controller 3052 controls the photovoltaic tracking support 303 to reversely track and rotate according to the first control instruction to reduce the incident angle of illumination.

(2) When the first control command for controlling the PV tracking support 303 is generated by the PV tracking slave controller 3052, the details are as follows:

The photovoltaic tracking master controller 3051 is further configured to receive the photovoltaic tracking related information, and forward the photovoltaic tracking related information to the photovoltaic tracking slave controller 3052;

The photovoltaic tracking slave controller 3052 is configured to generate the photovoltaic tracking related information according to the photovoltaic tracking related information when the AC power state is the AC power limited state and the photovoltaic tracking support tracking command is a tracking support anti-tracking command. The first control command, and according to the first control command, the photovoltaic tracking support 303 is controlled to reversely track and rotate to reduce the incident angle of illumination.

Likewise, in practical applications, the second control command for controlling the PV tracking support 303 may be generated by the PV tracking master controller 3051 or the PV tracking slave controller 3052 .

(1) When the second control command for controlling the PV tracking support 303 is generated by the PV tracking master controller 3051, the details are as follows:

The overall photovoltaic tracking controller 3051 is further configured to generate a reduced photovoltaic system according to the photovoltaic tracking related information when the AC power state is the AC limited power state and the photovoltaic tracking support tracking command is a tracking support loss reduction command. Loss of the second control command, and send the second control command to the photovoltaic tracking slave controller 3052, wherein the tracking bracket loss reduction command does not exceed the DC operating voltage of the photovoltaic inverter. the threshold voltage is generated;

The photovoltaic tracking slave controller 3052 controls the photovoltaic tracking bracket 303 to reduce the rotation tracking frequency according to the second control instruction or controls the tracking angle of the photovoltaic tracking bracket 303 to remain unchanged.

(2) When the second control command for controlling the PV tracking support 303 is generated by the PV tracking slave controller 3052, the details are as follows:

The photovoltaic tracking slave controller 3052 is further configured to, when the AC power state is the AC power-limited state, and the photovoltaic tracking support tracking command is the tracking support loss reduction command, according to the photovoltaic tracking related information The second control command is generated, and according to the second control command, the photovoltaic tracking bracket 303 is controlled to reduce the rotation tracking frequency or the tracking angle of the photovoltaic tracking bracket 303 is controlled to remain unchanged.

It should be particularly noted that, for the specific working principles of each component in the photovoltaic tracking system, please refer to the corresponding part of the method embodiment, which will not be repeated here.

Finally, it should also be noted that in this document, relational terms such as first and second are used only to distinguish one entity or operation from another, and do not necessarily require or imply these entities or that there is any such actual relationship or sequence between operations. Moreover, the terms "comprising", "comprising" or any other variation thereof are intended to encompass a non-exclusive inclusion such that a process, method, article or device comprising a list of elements includes not only those elements, but also includes not explicitly listed or other elements inherent to such a process, method, article or apparatus. Without further limitation, an element qualified by the phrase "comprising a..." does not preclude the presence of additional identical elements in a process, method, article or apparatus that includes the element.

The various embodiments in this specification are described in a progressive manner, and each embodiment focuses on the differences from other embodiments, and the same and similar parts between the various embodiments can be referred to each other.

The above description of the disclosed embodiments enables any person skilled in the art to make or use the present invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the invention. Thus, the present invention is not intended to be limited to the embodiments shown herein, but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims

A photovoltaic tracking support control method, characterized in that it is applied to a photovoltaic tracking controller, and the control method includes:

Obtaining photovoltaic tracking related information, the photovoltaic tracking related information includes: the AC power state of the photovoltaic inverter, the electrical parameters and the photovoltaic tracking support tracking command;

When the AC power state is the AC power-limited state, and the photovoltaic tracking support tracking command is a tracking support anti-tracking command, a first control command for reducing the incident angle of illumination is generated according to the photovoltaic tracking related information, wherein the The tracking bracket anti-tracking command is generated when the DC operating voltage of the photovoltaic inverter exceeds the threshold voltage;

The photovoltaic tracking support is controlled to reversely track and rotate according to the first control instruction to reduce the incident angle of illumination.
The photovoltaic tracking support control method according to claim 1, further comprising:

When the AC power state is the AC power limit state, and the photovoltaic tracking support tracking command is a tracking support loss reduction command, a second control command for reducing photovoltaic system loss is generated according to the photovoltaic tracking related information, wherein, The tracking bracket loss reduction command is generated when the DC operating voltage of the photovoltaic inverter does not exceed the threshold voltage;

According to the second control instruction, the photovoltaic tracking bracket is controlled to reduce the rotation tracking frequency or the tracking angle of the photovoltaic tracking bracket is controlled to remain unchanged.
The photovoltaic tracking support control method according to claim 1 or claim 2, wherein when the alternating current power of the photovoltaic inverter reaches the maximum limit power, the alternating current power state of the photovoltaic inverter is switched to the Describe the AC power limit state;

Alternatively, when the photovoltaic inverter receives the power scheduling instruction sent by the background server, the AC power state of the photovoltaic inverter is switched to the AC power limited state.
The photovoltaic tracking support control method according to claim 1, further comprising:

When the AC power state is an AC normal power state, and the photovoltaic tracking support tracking command is a tracking support normal tracking command, generating a third control command for tracking the optimal illumination incident angle according to the photovoltaic tracking related information;

According to the third control instruction, the photovoltaic tracking support is controlled to perform optimal illumination incident angle tracking.
A photovoltaic tracking controller, comprising:

an acquisition unit, configured to acquire photovoltaic tracking related information, the photovoltaic tracking related information includes: the AC power state of the photovoltaic inverter, the electrical parameters and the photovoltaic tracking support tracking command;

The first control command generation unit is configured to generate a signal that reduces the incident angle of illumination according to the photovoltaic tracking related information when the AC power state is the AC power-limited state and the photovoltaic tracking support tracking command is a tracking support anti-tracking command. a first control command, wherein the tracking support anti-tracking command is generated when the DC operating voltage of the photovoltaic inverter exceeds a threshold voltage;

The first control unit is configured to control the photovoltaic tracking support to reversely track and rotate according to the first control instruction, so as to reduce the incident angle of illumination.
The photovoltaic tracking controller of claim 5, further comprising:

A second control command generating unit, configured to generate a photovoltaic system with reduced power according to the photovoltaic tracking related information when the AC power state is the AC power limited state and the photovoltaic tracking support tracking command is a tracking support loss reduction command a second loss control command, wherein the tracking bracket loss reduction command is generated when the DC operating voltage of the photovoltaic inverter does not exceed the threshold voltage;

The second control unit is configured to control the photovoltaic tracking support to reduce the rotation tracking frequency or control the tracking angle of the photovoltaic tracking support to remain unchanged according to the second control instruction.
The photovoltaic tracking controller of claim 5, further comprising:

A third control command generating unit, configured to generate an optimal illumination incident angle according to the photovoltaic tracking related information when the AC power state is the AC normal power state and the photovoltaic tracking support tracking command is the tracking support normal tracking command Tracked third control instructions;

A third control unit, configured to control the photovoltaic tracking support to perform optimal illumination incident angle tracking according to the third control instruction.
A photovoltaic tracking system, characterized by comprising: a photovoltaic inverter, a data collector, a photovoltaic tracking bracket, a photovoltaic assembly, and the photovoltaic tracking controller according to any one of claims 5 to 7;

The data collector is respectively connected with the photovoltaic inverter and the photovoltaic tracking controller, and the data collector is configured to send photovoltaic tracking related information to the photovoltaic tracking controller, and the photovoltaic tracking related information includes: Describe the AC power status, electrical parameters and PV tracking support tracking commands of the PV inverter;

The photovoltaic tracking controller is connected with the photovoltaic tracking bracket, the photovoltaic component is installed on the photovoltaic tracking bracket, the photovoltaic component is connected to the photovoltaic inverter, and the photovoltaic tracking controller is used to complete all the steps. The control of the rotation of the photovoltaic tracking support, when the AC power state is the AC power limit state, and the photovoltaic tracking support tracking command is the tracking support anti-tracking command, according to the photovoltaic tracking related information to reduce the illumination incident angle. a control instruction, according to the first control instruction to control the reverse tracking rotation of the photovoltaic tracking support to reduce the incident angle of light, wherein the tracking support reverse tracking command is performed when the DC operating voltage of the photovoltaic inverter exceeds a threshold voltage generated when.
The photovoltaic tracking system according to claim 8, wherein,

The photovoltaic inverter is configured to send initial photovoltaic tracking related information including at least the AC power state and the electrical parameter to the data collector;

The data collector is configured to determine whether the initial photovoltaic tracking related information includes the tracking bracket anti-tracking command when the AC power state is the AC power-limited state, and if so, correlate the initial photovoltaic tracking The information is sent to the photovoltaic tracking controller as the photovoltaic tracking related information, if not, when the DC working voltage of the photovoltaic inverter in the electrical parameter exceeds the threshold voltage, the tracking bracket is generated. tracking command, and sending the initial photovoltaic tracking related information together with the tracking bracket anti-tracking command as the photovoltaic tracking related information to the photovoltaic tracking controller.
The photovoltaic tracking system according to claim 9, wherein the data collector is further used for:

When the AC power state is the AC power limit state, determine whether the initial photovoltaic tracking related information includes a tracking bracket loss reduction command, and if so, send the initial photovoltaic tracking related information as the photovoltaic tracking related information to The photovoltaic tracking controller, if not, generates the tracking bracket loss reduction command when the DC operating voltage of the photovoltaic inverter does not exceed the threshold voltage, and combines the initial photovoltaic tracking related information with all the relevant information. The tracking bracket loss reduction command is sent to the photovoltaic tracking controller as the photovoltaic tracking related information.
The photovoltaic tracking system according to claim 8, wherein the photovoltaic tracking related information further comprises: the latitude and longitude position of the photovoltaic power station and current weather information.
The photovoltaic tracking system according to claim 11, wherein the photovoltaic tracking controller is further used for:

Directly receive the latitude and longitude position of the photovoltaic power station and the current weather information sent by the background server;

or,

The latitude and longitude position of the photovoltaic power station and the current weather information sent by the background server are received by the data collector.
The photovoltaic tracking system according to claim 8, wherein the photovoltaic tracking controller comprises: a photovoltaic tracking master controller and a photovoltaic tracking slave controller;

The photovoltaic tracking master controller is respectively connected with the data collector and the photovoltaic tracking slave controller, and the photovoltaic tracking slave controller is connected with the photovoltaic tracking support;

The photovoltaic tracking master controller is configured to receive the photovoltaic tracking related information sent by the data collector, and when the AC power state is the AC power limited state, and the photovoltaic tracking support tracking command is the tracking support reverse. When tracking a command, the first control instruction is generated according to the photovoltaic tracking related information, and the first control instruction is sent to the photovoltaic tracking slave controller;

The photovoltaic tracking slave controller controls the photovoltaic tracking support to reversely track and rotate according to the first control instruction to reduce the incident angle of illumination.
The photovoltaic tracking system according to claim 13, wherein the photovoltaic tracking master controller is further configured to receive the photovoltaic tracking related information, and forward the photovoltaic tracking related information to the photovoltaic tracking slave controller ;

The photovoltaic tracking slave controller is configured to generate the first photovoltaic tracking-related information according to the photovoltaic tracking related information when the AC power state is the AC power-limited state and the photovoltaic tracking support tracking command is a tracking support anti-tracking command. control instructions, and control the photovoltaic tracking support to reversely track and rotate according to the first control instructions to reduce the incident angle of illumination.
The photovoltaic tracking system according to claim 13, wherein the photovoltaic tracking master controller is further used for when the AC power state is the AC power limited state, and the photovoltaic tracking support tracking command is a tracking support In the case of a loss reduction command, a second control command for reducing the loss of the photovoltaic system is generated according to the photovoltaic tracking related information, and the second control command is sent to the photovoltaic tracking slave controller, wherein the tracking bracket loss reduction command generated when the DC operating voltage of the photovoltaic inverter does not exceed the threshold voltage;

The photovoltaic tracking slave controller controls the photovoltaic tracking bracket to reduce the rotation tracking frequency according to the second control instruction or controls the tracking angle of the photovoltaic tracking bracket to maintain the same.
The photovoltaic tracking system according to claim 14, wherein the photovoltaic tracking master controller is further configured to receive the photovoltaic tracking related information, and forward the photovoltaic tracking related information to the photovoltaic tracking slave controller ;

The photovoltaic tracking slave controller is further configured to generate according to the photovoltaic tracking related information when the AC power state is the AC power-limited state and the photovoltaic tracking support tracking command is the tracking support loss reduction command the second control instruction, and control the photovoltaic tracking support to reduce the rotation tracking frequency or control the tracking angle of the photovoltaic tracking support to remain unchanged according to the second control instruction.
The photovoltaic tracking system according to claim 8, wherein the photovoltaic inverter comprises: a string inverter, a centralized inverter, a combiner box, and an intelligent combiner box containing a DC/DC conversion unit. any kind.