Photovoltaic tracking support angle synchronous control system based on Modbus

Abstract

The embodiment of the utility model provides a photovoltaic tracking support angle synchronous control system based on a Modbus, which relates to the technical field of photovoltaic tracking supports and comprises a master TCU module and a plurality of slave TCU modules connected with the master TCU module. The main TCU module is connected with an external monitoring control system; the master TCU module and the plurality of slave TCU modules are respectively connected with a photovoltaic tracking support. Wherein the main TCU module comprises a TCU sub-module, an RS485 serial port / RJ45 network port, a GPS time service module and a simple weather station; and the RS485 serial port / RJ45 network port, the GPS time service module and the simple weather station are all connected with the TCU sub-module. According to the technical scheme of the utility model, the NCU is replaced by the main TCU, on the basis of original functional requirements, the manufacturing cost of NCU equipment is saved, the manufacturing cost of other TCU equipment except the main TCU is reduced, and the complexity of installation and debugging work is reduced.

Description

Technical Field

[0001] The utility model relates to the technical field of photovoltaic tracking brackets, and in particular to a photovoltaic tracking bracket angle synchronization control system based on Modbus. Background Art

[0002] The existing photovoltaic tracking bracket control system is generally divided into a communication controller (NCU) and a execution controller (TCU). The NCU mainly coordinates the data acquisition and processing, command execution and issuance between the background data acquisition and supervisory control system (SCADA) system and the TCU; while the lower computer TCU mainly uses the time control algorithm to calculate the real-time bracket tracking angle with the real-time clock and geographic information, and performs closed-loop control with the tilt sensor to keep the bracket within a certain range before and after the calculated target tracking angle to achieve tracking control; usually, a tracking bracket is equipped with a TCU device, which is a single control; an NCU device matches multiple TCU devices, and wireless communication and Modbus communication protocol are used between NCU and TCU. The number of TCU devices cannot exceed the maximum number of slave device addresses required by the Modbus protocol.

[0003] According to the existing tracking photovoltaic bracket control system topology and hierarchical division, it can be found that:

[0004] Equipment performance redundancy: Referring to the functional requirements mentioned above, both NCU and TCU can use single-chip microcomputer as processor for function development, and the performance is still redundant;

[0005] Wireless communication is used between NCU and TCU, which is mainly responsible for collecting multiple TCU parameters into a single device for query by the SCADA system, and sending control instructions from the SCADA system to each TCU. There is no need to set up a separate device for this function, which will only increase the system complexity and equipment cost. Utility Model Content

[0006] The embodiment of the utility model provides a photovoltaic tracking bracket angle synchronization control system based on Modbus to solve the technical problems existing in the prior art.

[0007] Other features and advantages of the present invention will become apparent from the following detailed description or may be learned in part from the practice of the present invention.

[0008] According to a first aspect of an embodiment of the utility model, a photovoltaic tracking bracket angle synchronization control system based on Modbus is provided, comprising: a master TCU module and a plurality of slave TCU modules connected to the master TCU module;

[0009] The main TCU module is connected to an external monitoring control system;

[0010] The master TCU module and the plurality of slave TCU modules are each connected to a photovoltaic tracking bracket;

[0011] The main TCU module includes a TCU submodule, an RS485 serial port / RJ45 network port, a GPS timing module and a simple weather station;

[0012] The RS485 serial port / RJ45 network port, the GPS timing module and the simple weather station are all connected to the TCU submodule.

[0013] In some embodiments of the present utility model, based on the above scheme, the TCU submodule includes: a first tilt sensor, a first wireless communication module, a first DC motor drive circuit, a first electric push rod / rotation mechanism, a first motor Hall acquisition circuit and a first MCU control chip;

[0014] The first inclination sensor, the first wireless communication module, the first DC motor drive circuit, the first motor Hall acquisition circuit, the RS485 serial port / RJ45 network port, the GPS timing module and the simple weather station are all connected to the first MCU control chip;

[0015] The first DC motor drive circuit is also connected to the first electric push rod / rotation mechanism;

[0016] The first electric push rod / rotation mechanism is also connected to the first motor Hall acquisition circuit.

[0017] In some embodiments of the utility model, based on the above scheme, the slave TCU module includes: a second tilt sensor, a second wireless communication module, a second DC motor drive circuit, a second electric push rod / rotation mechanism, a second motor Hall acquisition circuit and a second MCU control chip;

[0018] The second inclination sensor, the second wireless communication module, the second DC motor drive circuit and the second motor Hall acquisition circuit are all connected to the second MCU control chip;

[0019] The second DC motor drive circuit is also connected to the second electric push rod / rotation mechanism;

[0020] The second electric push rod / rotation mechanism is also connected to the second motor Hall acquisition circuit.

[0021] In some embodiments of the present invention, based on the aforementioned solution, the RS485 serial port / RJ45 network port is connected to the monitoring and control system.

[0022] In some embodiments of the present invention, based on the above solution, the first wireless communication module is connected to the second wireless communication module.

[0023] In some embodiments of the present invention, based on the above solution, the first electric push rod / rotation mechanism is connected to the photovoltaic tracking bracket.

[0024] In some embodiments of the present invention, based on the above solution, the first electric push rod / rotation mechanism is connected to the photovoltaic tracking bracket.

[0025] The technical solution of the utility model, by utilizing the main TCU instead of the NCU, eliminates the manufacturing cost of the NCU equipment on the basis of the original functional requirements, reduces the manufacturing cost of the remaining TCU equipment except the main TCU, and reduces the complexity of installation and debugging work.

[0026] It should be understood that the above general description and the following detailed description are exemplary and explanatory only and are not restrictive of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] The drawings herein are incorporated into the specification and constitute a part of the specification, showing embodiments consistent with the present utility model, and together with the specification, are used to explain the principles of the present utility model. Obviously, the drawings described below are only some embodiments of the present utility model, and for ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work. In the drawings:

[0028] Figure 1 A block diagram of a photovoltaic tracking bracket angle synchronization control system based on Modbus according to an embodiment of the utility model is shown;

[0029] Figure 2 A block diagram of a main TCU module according to an embodiment of the present utility model is shown. DETAILED DESCRIPTION

[0030] The example embodiments will now be described more fully with reference to the accompanying drawings. However, the example embodiments can be implemented in a variety of forms and should not be construed as limited to the examples set forth herein; on the contrary, these embodiments are provided so that the present invention will be more comprehensive and complete, and the concept of the example embodiments will be fully conveyed to those skilled in the art.

[0031] In addition, the described features, structures or characteristics may be combined in one or more embodiments in any suitable manner. In the following description, many specific details are provided to provide a full understanding of the embodiments of the present utility model. However, those skilled in the art will appreciate that the technical solution of the present utility model can be practiced without one or more of the specific details, or other methods, components, devices, steps, etc. may be adopted. In other cases, known methods, devices, implementations or operations are not shown or described in detail to avoid blurring the various aspects of the present utility model.

[0032] It should be noted that the terms "first", "second", etc. in the specification and claims of the present invention and the above-mentioned drawings are used to distinguish similar objects, and are not necessarily used to describe a specific order or sequence. It should be understood that the objects used in this way can be interchanged where appropriate, so that the embodiments of the present invention described herein can be implemented in an order other than those shown or described.

[0033] In order to make the purpose, technical solution and advantages of the utility model clearer, the technical solution in the embodiment of the utility model will be clearly and completely described below in conjunction with the drawings in the embodiment of the utility model. Obviously, the described embodiment is only a part of the embodiment of the utility model, not all the embodiments. Based on the embodiment of the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0034] Some embodiments of the present invention will be described in detail below in conjunction with the accompanying drawings. In the absence of conflict, the following embodiments and features in the embodiments can be combined with each other.

[0035] In order to solve the technical problems existing in the prior art, the embodiment of the utility model provides a photovoltaic tracking bracket angle synchronization control system based on Modbus, including: a master TCU module and a plurality of slave TCU modules connected to the master TCU module;

[0036] The main TCU module is connected to an external monitoring control system;

[0037] The master TCU module and the plurality of slave TCU modules are each connected to a photovoltaic tracking bracket;

[0038] The main TCU module includes a TCU submodule, an RS485 serial port / RJ45 network port, a GPS timing module and a simple weather station;

[0039] The RS485 serial port / RJ45 network port, the GPS timing module and the simple weather station are all connected to the TCU submodule.

[0040] It can be understood that in this embodiment, the main TCU module replaces the NCU in the original system. The RS485 serial port / RJ45 network port added in the main TCU module can realize the communication function of the original NCU to the background; the added GPS timing module can realize the ability to independently obtain the real-time clock after canceling the original NCU, and calculate the real-time tracking angle based on the clock; the added simple weather station can enable the original NCU to collect meteorological parameters such as on-site environmental wind speed, and control its own bracket to operate to a protective posture based on the meteorological parameters, and synchronize the protection posture angle to the remaining slave TCUs.

[0041] For example, see Figure 1 , shows a block diagram of a Modbus-based photovoltaic tracking bracket angle synchronization control system according to an embodiment of the utility model.

[0042] like Figure 1 As shown, the photovoltaic tracking bracket angle synchronization control system includes a master TCU module and N slave TCU modules. Each slave TCU module is connected to the master TCU module. The master TCU module is connected to a photovoltaic tracking bracket. Each slave TCU module is also connected to a photovoltaic tracking bracket accordingly. The master TCU module is also connected to the external SCADA system (monitoring and control system).

[0043] The workflow of the main TCU module is as follows:

[0044] When the system starts running, it will first perform system initialization steps, including point table initialization, data initialization, importing system parameters stored in Flash into the system, etc., to ensure the normal operation of the system.

[0045] Then enter the main loop, in which the current support tracking angle is continuously calculated according to the system real-time clock, the actual support angle is collected, and the support tracking angle is calibrated according to the set angle deviation allowable range;

[0046] After the calibration is completed, the current motor Hall value is collected and synchronized to other slave TCU modules;

[0047] During the cycle, it waits for the operation instructions from the SCADA system. If it receives an instruction from the SCADA system, it processes it according to the instruction type. If SCADA wants to query the controller parameters, it returns the controller parameters to the SCADA system; if SCADA issues various protection posture instructions, it adjusts the target tracking angle of the bracket to the preset protection angle, collects the actual angle to complete the control closed loop, and then collects the Hall value and synchronizes it to other slave TCUs; if SCADA issues a specified operating angle instruction, it operates according to the angle issued by SCADA, and then collects the Hall value and synchronizes it to other slave TCU modules.

[0048] The workflow from the TCU module is as follows:

[0049] When starting to run, the system initialization steps are performed first, including point table initialization and data initialization, to ensure that the system can operate normally.

[0050] Then it enters the main loop and waits for the instructions from the main TCU module. The instructions are mainly the Hall values ​​that need to be synchronized. When the Hall values ​​sent by the main TCU module are received, the actual Hall values ​​are collected, and the Hall values ​​are synchronized with the Hall values ​​of the main TCU module by driving the motor, so that the angle of the bracket carried by itself is synchronized with the angle of the bracket carried by the main TCU module.

[0051] It should be noted that the main TCU module is configured with a communication point table between the main TCU module and the SCADA system, as shown in Table 1, for the SCADA system to read and write.

[0052] Table 1 Communication points between main TCU module and SCADA system

[0053]

[0054] It should be noted that the main TCU module is configured with a communication point table between the slave TCU module and the main TCU module, as shown in Table 2, for the main TCU module to read and write.

[0055] Table 2 Communication points between slave TCU module and master TCU module

[0056]

[0057] It should be noted that after the bracket is installed and before using the control system, all brackets need to be laid flat, and the default values ​​of the Hall and angle need to be set in a flat posture, so that the angle and Hall values ​​are matched to 0, with the Hall increment as a positive value and the Hall decrement as a negative value.

[0058] According to the ModbusRTU protocol, one master TCU device can match up to 200 slave TCU devices.

[0059] In some feasible embodiments, based on the above scheme, the TCU submodule includes: a first tilt sensor, a first wireless communication module, a first DC motor drive circuit, a first electric push rod / rotation mechanism, a first motor Hall acquisition circuit and a first MCU control chip;

[0060] The first inclination sensor, the first wireless communication module, the first DC motor drive circuit, the first motor Hall acquisition circuit, the RS485 serial port / RJ45 network port, the GPS timing module and the simple weather station are all connected to the first MCU control chip;

[0061] The first DC motor drive circuit is also connected to the first electric push rod / rotation mechanism;

[0062] The first electric push rod / rotation mechanism is also connected to the first motor Hall acquisition circuit.

[0063] It can be understood that the main TCU module in the present invention is essentially a corresponding improvement on the original TCU module so that it can have the functions of NCU while having the functions of TCU. Therefore, the essence of the TCU sub-module is the original TCU module, that is, the functional devices included in the TCU sub-module in the present invention are the same as the functional devices set in the TCU module.

[0064] For example, see Figure 2 , shows a structural block diagram of a main TCU module according to an embodiment of the utility model.

[0065] like Figure 2 As shown in the figure, the main TCU module mainly includes TCU submodule, RS485 serial port / RJ45 network port, GPS timing module and simple weather station. Among them, the functional components of TCU submodule are the same as those of slave TCU module, that is, they all include inclination sensor, wireless communication module, DC motor drive circuit, electric push rod / rotation mechanism, motor Hall acquisition circuit and MCU control chip.

[0066] It should be noted that the main TCU module provided by the utility model has the original TCU function, that is, the Modbus slave function, and can replace the NCU to communicate with the SCADA system.

[0067] The main TCU module has GPS function, obtains local latitude and longitude and real-time clock at a certain period, and has RTC function to ensure accurate operation of system time in the event of temporary loss of GPS signal.

[0068] The main TCU module can calculate the tracking angle through a timing control algorithm.

[0069] The main TCU module is equipped with an inclination sensor and a motor drive circuit to perform closed-loop control of the tracking angle.

[0070] The master TCU module has the sampling function of the Hall sensor or encoder, and synchronizes the motor positions of other slave TCU modules based on the data of a single bracket controlled by itself.

[0071] The main TCU module replaces the NCU device, which can save the NCU device cost and reduce the performance redundancy of a single device while ensuring the original functions.

[0072] In some feasible embodiments, based on the above solution, the slave TCU module includes: a second tilt sensor, a second wireless communication module, a second DC motor drive circuit, a second electric push rod / rotation mechanism, a second motor Hall acquisition circuit and a second MCU control chip;

[0073] The second inclination sensor, the second wireless communication module, the second DC motor drive circuit and the second motor Hall acquisition circuit are all connected to the second MCU control chip;

[0074] The second DC motor drive circuit is also connected to the second electric push rod / rotation mechanism;

[0075] The second electric push rod / rotation mechanism is also connected to the second motor Hall acquisition circuit.

[0076] It should be noted that the second wireless communication module provided in the slave TCU module realizes communication with the master TCU module to obtain the synchronous Hall sensor value.

[0077] The slave TCU module drives the motor to operate after receiving the motor position information from the master TCU module through the second motor Hall acquisition circuit, so that its own motor is synchronized with the master TCU motor.

[0078] The TCU module no longer needs to have the angle calculation function and the bracket inclination acquisition module, and a relatively low-cost entry-level MCU can be used as the control unit, thereby reducing the module cost of a single TCU and making installation and maintenance easier.

[0079] In some feasible embodiments, based on the aforementioned solution, the RS485 serial port / RJ45 network port is connected to the monitoring and control system.

[0080] It can be understood that, in this embodiment, the main TCU module realizes communication and data transmission with the monitoring control system through the RS485 serial port / RJ45 network port.

[0081] In some feasible embodiments, based on the above solution, the first wireless communication module is connected to the second wireless communication module.

[0082] It can be understood that, in this embodiment, the communication between the master TCU module and the slave TCU module is achieved through the first wireless communication module and the second wireless communication module.

[0083] In some feasible embodiments, based on the above solution, the first electric push rod / rotation mechanism is connected to the photovoltaic tracking bracket.

[0084] It can be understood that, in this embodiment, the main TCU module adjusts the angle and posture of the photovoltaic tracking bracket through the first electric push rod / rotation mechanism.

[0085] It can be understood that the photovoltaic tracking bracket in this embodiment refers to the photovoltaic tracking bracket controlled by the main TCU module. Figure 1 .

[0086] In some feasible embodiments, based on the above solution, the second electric push rod / rotation mechanism is connected to the photovoltaic tracking bracket.

[0087] It can be understood that, in this embodiment, the angle and posture of the photovoltaic tracking bracket are adjusted from the TCU module through the second electric push rod / rotation mechanism.

[0088] It can be understood that the photovoltaic tracking bracket in this embodiment refers to the photovoltaic tracking bracket controlled by the slave TCU module. Figure 1 .

[0089] Those skilled in the art will readily come up with other embodiments of the present invention after considering the specification and practicing the embodiments disclosed herein. The present invention is intended to cover any variations, uses or adaptations of the present invention, which follow the general principles of the present invention and include common knowledge or customary technical means in the art that are not disclosed in the present invention. It should be understood that the present invention is not limited to the precise structure described above and shown in the accompanying drawings, and various modifications and changes can be made without departing from the scope thereof. The scope of the present invention is limited only by the appended claims.

Claims

1. A photovoltaic tracking bracket angle synchronization control system based on Modbus, characterized in that: include: A master TCU module and a plurality of slave TCU modules connected to the master TCU module; The main TCU module is connected to an external monitoring control system; The master TCU module and the plurality of slave TCU modules are each connected to a photovoltaic tracking bracket; The main TCU module includes a TCU submodule, an RS485 serial port / RJ45 network port, a GPS timing module and a simple weather station; The RS485 serial port / RJ45 network port, the GPS timing module and the simple weather station are all connected to the TCU submodule.

2. The system according to claim 1, characterized in that The TCU submodule includes: a first tilt sensor, a first wireless communication module, a first DC motor drive circuit, a first electric push rod / rotation mechanism, a first motor Hall acquisition circuit and a first MCU control chip; The first inclination sensor, the first wireless communication module, the first DC motor drive circuit, the first motor Hall acquisition circuit, the RS485 serial port / RJ45 network port, the GPS timing module and the simple weather station are all connected to the first MCU control chip; The first DC motor drive circuit is also connected to the first electric push rod / rotation mechanism; The first electric push rod / rotation mechanism is also connected to the first motor Hall acquisition circuit.

3. The system according to claim 2, characterized in that The slave TCU module includes: a second tilt sensor, a second wireless communication module, a second DC motor drive circuit, a second electric push rod / rotation mechanism, a second motor Hall acquisition circuit and a second MCU control chip; The second inclination sensor, the second wireless communication module, the second DC motor drive circuit and the second motor Hall acquisition circuit are all connected to the second MCU control chip; The second DC motor drive circuit is also connected to the second electric push rod / rotation mechanism; The second electric push rod / rotation mechanism is also connected to the second motor Hall acquisition circuit.

4. The system according to claim 3, characterized in that The RS485 serial port / RJ45 network port is connected to the monitoring and control system.

5. The system according to claim 3, characterized in that The first wireless communication module is connected to the second wireless communication module.

6. The system according to claim 3, characterized in that The first electric push rod / rotation mechanism is connected to the photovoltaic tracking bracket.

7. The system according to claim 3, characterized in that The second electric push rod / rotation mechanism is connected to the photovoltaic tracking bracket.

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