Photovoltaic direct acquisition and direct control method and device, terminal and medium

Abstract

The invention discloses a photovoltaic direct acquisition and direct control method and device, a terminal and a medium, and is characterized in that the method comprises the following steps: connecting a plurality of 485 transceivers with a plurality of running grid-connected inverters to acquire photovoltaic grid-connected signals; inputting the plurality of photovoltaic grid-connected signals into an MCU (Microprogrammed Control Unit) for storage and encryption by utilizing a plurality of optocouplers, and inputting the plurality of photovoltaic grid-connected signals into the master station system through a communication module; generating a control strategy of the master station system based on the plurality of photovoltaic grid-connected signals, and feeding back the control strategy to the grid-connected inverter through the MCU and the plurality of 485 transceivers; meanwhile, the system has a local voltage cooperative adjustment capability, and can adjust the output of the inverter in a linkage manner according to the information of other devices in a transformer area interacted by a main station, so as to locally solve the problem of voltage out-of-limit. And the communication process between the plurality of grid-connected inverters and the main station system is based on power supply of a power supply unit for implementing alternating-current and direct-current conversion. The communication requirement of the power grid on the access of the distributed terminal to the master station is met, and the communication safety of the distribution automation master station is ensured.

Description

Technical Field

[0001] The present invention relates to the field of power systems, and more specifically, to a photovoltaic direct procurement and control method, device, terminal and medium. Background Art

[0002] In recent years, with the promotion and application of distributed photovoltaics, the scale of distributed photovoltaic installations in various places has increased rapidly. Distributed photovoltaics have the characteristics of intermittency, dispersion, and randomness. Due to the limited capacity of the power grid end, the access of massive distributed photovoltaics to the power grid may cause changes in the power grid flow direction, local voltage limit, relay protection malfunction, etc., and the resulting harmonic pollution, voltage limit, three-phase imbalance and other problems may threaten the safe and stable operation of the power system. Distributed photovoltaic power generation inverter data has gradually become the key control object of power grid companies.

[0003] According to the requirements of the Typical Design Plan for Low-voltage Distributed Photovoltaic Metering and Collection, in order to better adapt to the large-scale grid-connected needs of distributed energy, energy storage, interactive energy facilities, etc., it is necessary to build low-voltage distributed photovoltaic "observable, measurable, adjustable, and controllable" capabilities, explore new technologies for intelligent perception and flexible control of the power grid, and assist in the construction of a new power system with new energy as the main body.

[0004] In order to achieve the "observable, measurable, adjustable and controllable" distributed photovoltaic inverters, the current mainstream solutions in the industry are the distributed photovoltaic grid-connected deployment methods of distribution automation master station + substation intelligent fusion terminal + protocol converter, distribution automation master station + substation intelligent fusion terminal + photovoltaic circuit breaker. Some photovoltaic inverter manufacturers, such as AISWEI, have developed a physical interface based on low-voltage power line high-speed carrier communication (HPLC, Highspeed Power Line Carrier) that can directly communicate with the substation intelligent fusion terminal. In the above solutions, the distribution automation master station sends the active power and reactive power adjustment strategy to the substation intelligent fusion terminal, and the substation intelligent fusion terminal then sends the adjustment command to the protocol converter or photovoltaic circuit breaker through the HPLC physical channel, and then transmits the command to the inverter for execution through 485 communication. The whole process involves 3 communication processes and 4 communication nodes.

[0005] Due to the different types of inverters, different communication protocols and different communication physical interfaces, it is difficult to achieve a unified physical connection. Therefore, the key to solving the problem of "observable, measurable, adjustable and controllable" distributed photovoltaics lies in the unified communication with the inverter.

[0006] The above mainstream technical solutions still have some shortcomings and deficiencies. First, due to the low coverage rate of intelligent fusion terminals in the substation area, only the low-voltage distribution substation area in the urban area has a high penetration rate, but the distributed photovoltaic installation in the urban area is generally small. Therefore, in rural areas with a large number of distributed photovoltaic installations, the above solution requires the installation of intelligent fusion terminals in the substation area, which is costly and complex to install and requires power outage for installation.

[0007] Secondly, due to the use of carrier communication, there is a hidden danger of conflict with the frequency band of household meters and regional meter reading concentrators, which may cause abnormal operation of the meter and affect the meter reading. At the same time, since the working principle of the inverter is that the power electronic components convert the DC voltage of the photovoltaic panel into AC power through high-frequency switching, the high-order harmonics generated by the inverter itself will also interfere with the carrier communication.

[0008] Third, the communication process is too complicated. From the master station sending the adjustment command to the inverter successfully executing it, there are as many as 3 communication processes and 4 communication nodes. Each process has a large risk of communication interference. In addition, in order to implement distributed photovoltaic data collection, it is necessary to provide a separate power supply for the collection equipment. However, in the environment of data collection and centralized analysis, there is usually no suitable power supply required by the collection equipment.

[0009] In view of the above problems, a photovoltaic direct procurement and control method, device, terminal and medium are urgently needed. Summary of the invention

[0010] In order to solve the deficiencies in the prior art, the present invention provides a photovoltaic direct procurement and direct control method, device, terminal and medium, which implements the association between the grid-connected inverter and the master station system through a 485 transceiver, optocoupler isolation and MCU, and provides power to different modules through a power supply unit.

[0011] The present invention adopts the following technical solution.

[0012] The first aspect of the present invention relates to a photovoltaic direct acquisition and direct control method, which includes the following steps: connecting to multiple running grid-connected inverters through multiple 485 transceivers to collect photovoltaic grid-connected signals; using multiple optocouplers to isolate multiple photovoltaic grid-connected signals and input them into the MCU for storage and encryption, and input multiple photovoltaic grid-connected signals into the master station system through a communication module; based on multiple photovoltaic grid-connected signals, generating a control strategy for the master station system, and feeding the control strategy back to the grid-connected inverter through the MCU and multiple 485 transceivers; at the same time, the present invention has the ability to coordinate local voltage regulation, and can adjust the inverter output according to the information linkage of other devices in the substation area interacting with the master station, so as to solve the voltage over-limit problem locally. The communication process between multiple grid-connected inverters and the master station system is based on the power supply of the power supply unit that implements AC / DC conversion.

[0013] Preferably, multiple 485 transceivers are connected to multiple running grid-connected inverters to collect photovoltaic grid-connected signals, including: the communication process between multiple grid-connected inverters and the master station system is based on the power supply unit that implements AC / DC conversion, including: converting the AC voltage between 100V and 220V into a low-voltage DC voltage through an AC / DC module; inputting the low-voltage DC signal into the isolation power supply chip to obtain a first voltage for powering multiple optocoupler isolations and 485 transceivers; inputting the low-voltage DC signal into the power supply monitoring circuit, the first LDO boost circuit, the first LDO boost circuit, and the second LDO circuit through the first super capacitor to obtain the first LDO signal and the second LDO signal respectively; inputting the high-voltage side voltage of the super capacitor and the first LDO signal into the first DC / DC module to obtain the second voltage for powering the MCU; inputting the high-voltage side voltage of the super capacitor and the first LDO signal into the second DC / DC module to obtain the third voltage for powering the communication module; inputting the second LDO signal into the third DC / DC module to obtain the fourth voltage for powering the encryption chip.

[0014] Preferably, the low-voltage DC signal is input into the power monitoring circuit, the first LDO boost circuit and the second LDO circuit through the first super capacitor to obtain the first LDO signal and the second LDO signal respectively, including: the power monitoring circuit includes a control switch; when the high-voltage side voltage of the first super capacitor is greater than or equal to 3.7V, the control switch is in an on state to start the first LDO boost circuit to perform boosting; when the high-voltage side voltage of the first super capacitor is less than 3.7V, the control switch is in an off state to shut down the first LDO boost circuit and only power the first DCDC module through the high-voltage side voltage of the first capacitor.

[0015] Preferably, multiple photovoltaic grid-connected signals are input into the MCU for storage and encryption using multiple optocoupler isolations, and multiple photovoltaic grid-connected signals are input into the master station system through the communication module, including: the MCU is connected to the optocoupler isolation through UART3 to obtain the photovoltaic grid-connected signal; the MCU is respectively connected to the encryption chip and the communication module to control the encryption chip to encrypt the photovoltaic grid-connected signal, and controls the communication module to send the encrypted photovoltaic grid-connected signal to the master station system.

[0016] Preferably, based on multiple photovoltaic grid-connected signals, a control strategy of the master station system is generated, and the control strategy is fed back to the grid-connected inverter through the MCU and multiple 485 transceivers, including: the master station system generates a control strategy using the locally stored adjustable and controllable strategy and the photovoltaic grid-connected signals received from multiple grid-connected inverters, and sends the control strategy to the MCU; the MCU controls the communication module to receive the control strategy, and controls the encryption chip to decrypt the control strategy, and sends the control strategy to the corresponding multiple grid-connected inverters through optocoupler isolation. At the same time, the present invention has the ability to coordinate local voltage regulation, and can adjust the inverter output in conjunction with the information of other devices in the substation area interacting with the master station, so as to solve the voltage over-limit problem locally.

[0017] The second aspect of the present invention relates to a photovoltaic direct acquisition and direct control device, which includes an MCU, multiple corresponding 485 transceivers and optocoupler isolations, and a power supply unit; wherein, multiple 485 transceivers are connected to multiple running grid-connected inverters to collect photovoltaic grid-connected signals; multiple optocoupler isolations input multiple photovoltaic grid-connected signals into the MCU for storage and encryption, and input multiple photovoltaic grid-connected signals into the master station system through a communication module; the MCU generates a control strategy for the master station system based on the multiple photovoltaic grid-connected signals, and feeds the control strategy back to the grid-connected inverter; the power supply unit is used to provide power for the communication process between multiple grid-connected inverters and the master station system based on the implementation of AC / DC conversion.

[0018] Preferably, in the power supply unit, an AC voltage between 100V and 220V is converted into a low-voltage DC voltage through an AC / DC module; the low-voltage DC signal is input into an isolated power supply chip to obtain a first voltage for powering multiple 485 transceivers; the low-voltage DC signal is input into a power monitoring circuit, a first LDO boost circuit, and a second LDO circuit through a first super capacitor to obtain a first LDO signal and a second LDO signal, respectively; the high-voltage side voltage of the super capacitor and the first LDO signal are input into the first DC / DC module to obtain a second voltage for powering the MCU; the high-voltage side voltage of the super capacitor and the first LDO signal are input into the second DC / DC module to obtain a third voltage for powering the communication module; the second LDO signal is input into the third DC / DC module to obtain a fourth voltage for powering the encryption chip.

[0019] Preferably, the power supply monitoring circuit includes a control switch; when the high-voltage side voltage of the first super capacitor is greater than or equal to 3.7V, the control switch is in an on state to start the first LDO boost circuit to implement boosting; when the high-voltage side voltage of the first super capacitor is less than 3.7V, the control switch is in an off state to shut down the first LDO boost circuit and only power the first DCDC module through the high-voltage side voltage of the first capacitor.

[0020] Preferably, the MCU is connected to the optocoupler through UART3 to obtain the photovoltaic grid-connected signal;

[0021] The MCU is connected to the encryption chip and the communication module respectively to control the encryption chip to encrypt the photovoltaic grid-connected signal, and controls the communication module to send the encrypted photovoltaic grid-connected signal to the master station system.

[0022] Preferably, the master station system generates a control strategy using the locally stored adjustable and controllable strategy and the photovoltaic grid-connected signals received from multiple grid-connected inverters, and sends the control strategy to the MCU; the MCU controls the communication module to receive the control strategy, and controls the encryption chip to decrypt the control strategy, and sends the control strategy to the corresponding multiple grid-connected inverters through optocoupler isolation.

[0023] A third aspect of the present invention relates to a terminal, comprising a processor and a storage medium; the storage medium is used to store instructions; the processor is used to operate according to the instructions to execute the steps of the method in the first aspect of the present invention.

[0024] A fourth aspect of the present invention relates to a computer-readable storage medium having a computer program stored thereon, which, when executed by a processor, implements the steps of the method in the first aspect of the present invention.

[0025] The beneficial effect of the present invention is that, compared with the prior art, the photovoltaic direct acquisition and direct control method, device, terminal and medium in the present invention implement the association between the grid-connected inverter and the master station system through a 485 transceiver, optical coupling isolation, and MCU, and provide power to different modules through a power supply unit. The present invention meets the communication requirements of the power grid for the access of distributed terminals to the master station, ensuring the distribution automation master station.

[0026] The beneficial effects of the present invention also include:

[0027] 1. The present invention does not rely on the intelligent fusion terminal of the substation area. It can be directly installed and used in rural areas with low coverage of the intelligent fusion terminal of the substation area. In the physical interface part, it only needs to communicate with the inverter through 485, and can be installed without power outage. The present invention does not rely on HPLC carrier communication, and communicates with the distribution automation master station through GPRS communication. The device has high reliability and strong signal stability. It fundamentally solves the problem of carrier communication frequency band conflict and influence on meter reading in the mainstream solution. Due to the use of point-to-point GPRS communication, the present invention can greatly optimize the complexity of communication. The communication process is simple and reliable. It only requires 1 communication process and 2 communication nodes, which improves the anti-interference ability of equipment communication.

[0028] 2. The present invention provides a reasonable power supply for multiple different modules, ensures the power supply in the process of multi-module integration, ensures the synergy of each module, and provides protection for the communication process between the distributed terminal and the main station. The device of the present invention can be directly installed in the distribution box next to the inverter. Due to the GPRS communication, the reliability and stability of the communication are guaranteed. Compared with the carrier-based communication in the intelligent fusion terminal solution of the substation, it has been greatly improved, and at the same time solves the impact on the meter reading in the substation.

[0029] 3. Since the present invention adopts the solution of direct collection and direct control of photovoltaic inverters, it improves the redundancy and complexity of the previous intelligent fusion terminal in the substation area. It not only solves the drawbacks of the existing solution that relies on the intelligent fusion terminal in the substation area from the root, but also can greatly improve the access rate of household distributed photovoltaic management and control.

[0030] 4. The present invention solves the common problem of insufficient local debugging interfaces in all inverter manufacturers by designing a 485 multi-channel communication solution, and can achieve dual-channel communication without affecting the work of the inverter collector. The present invention integrates the communication protocols of mainstream inverter manufacturers on the market, including Sungrow, AISWEI, and Ginlong, so as to achieve plug-and-play while meeting the requirements of non-power-off installation. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] Figure 1 A schematic diagram of the network between a photovoltaic direct acquisition and direct control device and a distributed photovoltaic inverter and a photovoltaic master station of the present invention;

[0032] Figure 2 This is a schematic diagram of the module structure of a core unit in a photovoltaic direct mining and direct control device of the present invention;

[0033] Figure 3 This is a schematic diagram of the module structure of a power supply unit in a photovoltaic direct mining and direct control device of the present invention;

[0034] Figure 4The schematic diagram is a schematic diagram of the communication between a photovoltaic direct procurement and direct control method of the present invention and a distributed photovoltaic inverter and a photovoltaic master station. DETAILED DESCRIPTION

[0035] In order to make the purpose, technical scheme and advantages of the present invention clearer, the technical scheme of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. The embodiments described in the present invention are only embodiments of a part of the present invention, not all embodiments. Based on the spirit of the present invention, all other embodiments not recorded in the present invention obtained by ordinary technicians in this field according to the embodiments recorded in the present invention without making creative work should belong to the protection scope of the present invention.

[0036] A first aspect of the present invention relates to a photovoltaic direct procurement and direct control method, characterized in that the method includes steps 1 to 4.

[0037] Step 1, connect to multiple running grid-connected inverters through multiple 485 transceivers to collect photovoltaic grid-connected signals. Step 2, use multiple optocouplers to input multiple photovoltaic grid-connected signals into the MCU for storage and encryption, and input multiple photovoltaic grid-connected signals into the master station system through the communication module. Step 3, based on multiple photovoltaic grid-connected signals, generate a control strategy for the master station system, and feed back the control strategy to the grid-connected inverter through the MCU and multiple 485 transceivers. Step 4, the communication process between multiple grid-connected inverters and the master station system is based on power supply from a power supply unit that implements AC / DC conversion.

[0038] Figure 1 The figure is a schematic diagram of the network between a photovoltaic direct acquisition and direct control device of the present invention and a distributed photovoltaic inverter and a photovoltaic master station. Figure 1 As shown, one end of the photovoltaic direct procurement and direct control device in the present invention is connected to multiple photovoltaic inverters through 485 interfaces respectively, and the other end communicates with the master station system through a wireless network, so that the information collected in the distributed photovoltaic inverter is sent to the master station, and the adjustable and controllable strategy of the master station is sent to the photovoltaic inverter. In addition, considering the installation position of the photovoltaic direct procurement and direct control device, the present invention also provides a power supply connection port between the photovoltaic direct procurement and direct control device and the low-voltage AC power supply port to ensure that the low-voltage AC power is converted into low-voltage DC power to supply the MCU and other computing units in the device.

[0039] Figure 2 The schematic diagram of the module structure of the core unit in a photovoltaic direct mining and direct control device of the present invention is shown in FIG. Figure 2As shown, in the second aspect of the present invention, the single-chip microcomputer GD32F103 communicates with the inverter through the 485 transceiver and reads the data of the inverter through the modbus protocol. The storage chip is used to store the adjustment instruction parameters issued by the master station and the inverter data read. The watchdog is used to monitor the normal operation of the single-chip microcomputer, and when an abnormality occurs, it will force the single-chip microcomputer to reset. The encryption chip is used to perform hardware encryption on the data communicated with the distribution automation master station to meet the encryption requirements of the power grid for the terminal access to the master station. The GPRS module is used for wireless communication between the single-chip microcomputer and the distribution automation master station.

[0040] Figure 3 The schematic diagram of the module structure of the power supply unit in a photovoltaic direct mining and direct control device of the present invention is shown in FIG. Figure 3 As shown, preferably, multiple 485 transceivers are connected to multiple running grid-connected inverters to collect photovoltaic grid-connected signals, including: the communication process between multiple grid-connected inverters and the master station system is based on the power supply unit that implements AC / DC conversion, including: converting the AC voltage between 100V and 220V into a low-voltage DC voltage through an AC / DC module; inputting the low-voltage DC signal into the isolation power supply chip, and ensuring that the 485 transceiver does not affect the normal operation of the MCU through the isolation power supply to obtain a first voltage for powering multiple optocoupler isolations and 485 transceivers; the low-voltage DC signal is transmitted through the first The supercapacitor is input into a power supply monitoring circuit, a first LDO boost circuit, and a second LDO circuit to obtain a first LDO signal and a second LDO signal respectively; the high-voltage side voltage of the supercapacitor and the first LDO signal are input into a first DC / DC module to obtain a second voltage for powering the MCU; the high-voltage side voltage of the supercapacitor and the first LDO signal are input into a second DC / DC module to obtain a third voltage for powering the communication module; the second LDO signal is input into a third DC / DC module to obtain a fourth voltage for powering the encryption chip.

[0041] Specifically, the AC / DC module realizes the conversion of an external 100V-220V AC power supply to a DC 5V power supply. The first supercapacitor is used to provide power for the device to continue to operate when the external power supply is lost.

[0042] RS485 bus is a common serial bus standard, which adopts balanced transmission and differential reception, so it has the ability to suppress common mode interference. When the communication distance is required to be from tens of meters to thousands of meters, RS485 bus is the most widely used bus. It is also widely used in multi-node working systems.

[0043] In practical applications, due to the complex field conditions, there is a very high common-mode voltage between the nodes. Although the RS485 interface adopts a differential transmission mode and has a certain ability to resist common-mode interference, when the common-mode voltage exceeds the limit receiving voltage of the 485 receiver, the receiver cannot work normally, and in severe cases, it may even burn the chip and equipment. For this reason, the present invention uses an isolated power supply to power the 485 receiving circuit and the optical coupling isolation circuit on one side of the distributed photovoltaic system to ensure the stability of the 485 receiver.

[0044] Preferably, the low-voltage DC signal is input into the power monitoring circuit, the first LDO boost circuit and the second LDO circuit through the first super capacitor to obtain the first LDO signal and the second LDO signal respectively, including: the power monitoring circuit includes a control switch; when the high-voltage side voltage of the first super capacitor is greater than or equal to 3.7V, the control switch is in an on state to start the first LDO boost circuit to perform boosting; when the high-voltage side voltage of the first super capacitor is less than 3.7V, the control switch is in an off state to shut down the first LDO boost circuit, and only the high-voltage side voltage of the first capacitor is used to power the first DCDC module.

[0045] In the present invention, the power supply monitoring circuit is used to monitor the voltage of the supercapacitor. When the voltage is less than 3.7V, the DC / DC boost module is turned on. Otherwise, the system is powered directly, and the supercapacitor is seamlessly put into use when the external power supply is powered off. The maximum voltage of the supercapacitor is 5V, which is supplied by the previous AC / DC module. The 5V output DC / DC boost circuit is used to turn on this module to boost the voltage to 5V for the system when the voltage is lower than 3.7V when the supercapacitor is powered.

[0046] In addition, the 3.3V output DC / DC module is used to provide working power for MCU, measurement and other modules; the 3.8V output DC / DC module is used to power the 4G communication module. The isolated power supply DC / DC5V-5V is used to isolate the DC 5V and apply it to the 485 part to achieve isolated communication. The 3.3V output is used for encryption chips. The encryption chip has high requirements for power supply voltage stability and is generally powered separately.

[0047] In one embodiment of the present invention, the LDO is implemented using an ADP121AUJZ chip. When the external power supply is powered off, the supercapacitor provides backup power, and the first and second LDO circuits achieve voltage stability for the supercapacitor to ensure normal operation of the system. In addition, the communication unit also includes a supercapacitor, which is used to provide peak power for the 4G communication module to prevent the front-stage DC / DC from failing to provide instantaneous high current under the peak power consumption of the 4G module, thereby affecting the normal operation of the 4G communication module.

[0048] Figure 4The schematic diagram of the communication between a photovoltaic direct acquisition and direct control method of the present invention and a distributed photovoltaic inverter and a photovoltaic master station. Figure 4 As shown, preferably, multiple photovoltaic grid-connected signals are input into the MCU for storage and encryption using multiple optocoupler isolations, and multiple photovoltaic grid-connected signals are input into the master station system through the communication module, including: the MCU is connected to the optocoupler isolation through UART3 to obtain the photovoltaic grid-connected signal; the MCU is respectively connected to the encryption chip and the communication module to control the encryption chip to encrypt the photovoltaic grid-connected signal, and controls the communication module to send the encrypted photovoltaic grid-connected signal to the master station system.

[0049] The 4G communication module uses UART to communicate with the MCU, and is used to exchange communication messages with the MCU. The 4G communication module is connected to the base station through a wireless public network, and finally connected to the Internet or an internal APN private network. The master station system sends active power and reactive power regulation strategies to the device of the present invention according to the load of the station area and the total capacity of photovoltaic power generation.

[0050] Preferably, based on multiple photovoltaic grid-connected signals, a control strategy of the master station system is generated, and the control strategy is fed back to the grid-connected inverter through the MCU and multiple 485 transceivers, including: the master station system uses the locally stored adjustable and controllable strategy and the photovoltaic grid-connected signals received from multiple grid-connected inverters to generate the control strategy, and sends the control strategy to the MCU; the MCU controls the communication module to receive the control strategy, and controls the encryption chip to decrypt the control strategy, and sends the control strategy to the corresponding multiple grid-connected inverters through optocoupler isolation.

[0051] In addition, in another implementation, a dedicated algorithm model for inverter status monitoring and adjustment can be embedded in the present invention, and the control instructions issued by the master station can be received through an encrypted channel, so as to perform local calculations through the algorithm model to remotely control the inverter and achieve the optimal output state. On the other hand, the present invention also supports the regular transmission of relevant electrical quantity information of the inverter to the distribution automation master station. The device interacts with the master station to obtain the load conditions of the substation and the line in real time, and then obtains the output conditions of other inverters in the substation through the query mechanism with the master station, so as to comprehensively calculate the active output ratio of the current inverter that needs to be dynamically adjusted, and send the ratio to the master station for execution preparation. The master station issues a command to allow adjustment to achieve the first round of inverter adjustment control.

[0052] The second aspect of the present invention relates to a photovoltaic direct acquisition and direct control device, which includes an MCU, multiple corresponding 485 transceivers and optocoupler isolations, and a power supply unit; wherein, multiple 485 transceivers are connected to multiple running grid-connected inverters to collect photovoltaic grid-connected signals; multiple optocoupler isolations input multiple photovoltaic grid-connected signals into the MCU for storage and encryption, and input multiple photovoltaic grid-connected signals into the master station system through a communication module; the MCU generates a control strategy for the master station system based on multiple photovoltaic grid-connected signals, and feeds the control strategy back to the grid-connected inverter; the power supply unit is used to provide power for the communication process between multiple grid-connected inverters and the master station system based on the implementation of AC / DC conversion.

[0053] Preferably, in the power supply unit, an AC voltage between 100V and 220V is converted into a low-voltage DC voltage through an AC / DC module; the low-voltage DC signal is input into an isolated power supply chip to obtain a first voltage for powering multiple 485 transceivers; the low-voltage DC signal is input into a power monitoring circuit, a first LDO boost circuit and a second LDO circuit through a first super capacitor to obtain a first LDO signal and a second LDO signal, respectively; the high-voltage side voltage of the super capacitor and the first LDO signal are input into a first DC / DC module to obtain a second voltage for powering the MCU; the high-voltage side voltage of the super capacitor and the first LDO signal are input into a second DC / DC module to obtain a third voltage for powering the communication module; the second LDO signal is input into a third DC / DC module to obtain a fourth voltage for powering the encryption chip.

[0054] Preferably, the power monitoring circuit includes a control switch; when the high-voltage side voltage of the first super capacitor is greater than or equal to 3.7V, the control switch is in an on state to start the first LDO boost circuit to perform boosting; when the high-voltage side voltage of the first super capacitor is less than 3.7V, the control switch is in an off state to shut down the first LDO boost circuit, and only the high-voltage side voltage of the first capacitor is used to power the first DCDC module.

[0055] Preferably, the MCU is connected to the optocoupler isolation through UART3 to obtain the photovoltaic grid-connected signal; the MCU is respectively connected to the encryption chip and the communication module to control the encryption chip to encrypt the photovoltaic grid-connected signal, and control the communication module to send the encrypted photovoltaic grid-connected signal to the master station system.

[0056] Preferably, the master station system generates a control strategy using a locally stored adjustable and controllable strategy and photovoltaic grid-connected signals received from a plurality of grid-connected inverters, and sends the control strategy to the MCU;

[0057] The MCU controls the communication module to receive the control strategy, controls the encryption chip to decrypt the control strategy, and sends the control strategy to the corresponding multiple grid-connected inverters through optocoupler isolation.

[0058] In field engineering applications, the device of the present invention communicates with the inverter via a 485 communication line, communicates with the distribution automation master station via an external 4G antenna, and supplies power to the present invention via the 220V AC output terminal of the inverter.

[0059] It is understandable that the photovoltaic direct purchase and direct control device includes hardware structures and / or software modules corresponding to the execution of each function in order to realize the various functions in the method provided in the above-mentioned embodiment of the present application. Those skilled in the art should easily realize that, in combination with the algorithm steps of each example described in the embodiments disclosed herein, the present application can be implemented in the form of hardware or a combination of hardware and computer software. Whether a function is executed in the form of hardware or computer software driving hardware depends on the specific application and design constraints of the technical solution. Professional and technical personnel can use different methods to implement the described functions for each specific application, but such implementation should not be considered to be beyond the scope of this application.

[0060] The embodiment of the present application can divide the photovoltaic direct purchase and direct control device into functional modules according to the above method example. For example, each functional module can be divided according to each function, or two or more functions can be integrated into one processing module. The above integrated modules can be implemented in the form of hardware or in the form of software functional modules. It should be noted that the division of modules in the embodiment of the present application is schematic and is only a logical functional division. There may be other division methods in actual implementation.

[0061] The device includes at least one processor, a bus system and at least one communication interface. The processor is composed of a central processing unit, a field programmable logic gate array, an application-specific integrated circuit or other hardware. The memory is composed of a read-only memory, a random access memory, etc. The memory can be independent and connected to the processor through a bus. The memory can also be integrated with the processor. The hard disk can be a mechanical disk or a solid-state hard disk, etc. The embodiment of the present invention is not limited to this. The above embodiments are usually implemented by software and hardware. When implemented using a software program, it can be implemented in the form of a computer program product. The computer program product includes one or more computer instructions.

[0062] A third aspect of the present invention relates to a terminal, comprising a processor and a storage medium; the storage medium is used to store instructions; the processor is used to operate according to the instructions to execute the steps of the method in the first aspect of the present invention.

[0063] A fourth aspect of the present invention relates to a computer-readable storage medium having a computer program stored thereon, which, when executed by a processor, implements the steps of the method in the first aspect of the present invention.

[0064] When loading and executing computer program instructions on a computer, corresponding functions are implemented according to the process provided in the embodiment of the present invention. The computer program instructions involved may be assembly instructions, machine instructions, or codes written in a programming language, etc.

[0065] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention rather than to limit it. Although the present invention has been described in detail with reference to the above embodiments, ordinary technicians in the relevant field should understand that the specific implementation methods of the present invention can still be modified or replaced by equivalents, and any modifications or equivalent replacements that do not depart from the spirit and scope of the present invention should be covered within the scope of protection of the claims of the present invention.

Claims

1. A photovoltaic direct mining and direct control method, characterized in that: The method comprises the following steps: Connect to multiple running grid-connected inverters through multiple 485 transceivers to collect photovoltaic grid-connected signals; Using multiple optocouplers to isolate the multiple photovoltaic grid-connected signals, the multiple photovoltaic grid-connected signals are input into the MCU for storage and encryption, and the multiple photovoltaic grid-connected signals are input into the master station system through a communication module; Based on the plurality of photovoltaic grid-connected signals, a control strategy of the master station system is generated, and the control strategy is fed back to the grid-connected inverter through the MCU and a plurality of 485 transceivers; The communication process between the plurality of grid-connected inverters and the master station system is based on power supply from a power supply unit that implements AC / DC conversion.

2. A photovoltaic direct mining and direct control method according to claim 1, characterized in that: The method of connecting to a plurality of grid-connected inverters in operation through a plurality of 485 transceivers to collect photovoltaic grid-connected signals includes: The communication process between the plurality of grid-connected inverters and the master station system is based on power supply by a power supply unit that implements AC / DC conversion, and includes: Convert AC voltage between 100V and 220V into low-voltage DC voltage through AC / DC module; Inputting the low voltage DC signal into an isolated power chip to obtain a first voltage for powering a plurality of optical coupler isolations and 485 transceivers; Inputting the low voltage DC signal into the power supply monitoring circuit, the first LDO boost circuit and the second LDO circuit through the first super capacitor to obtain the first LDO signal and the second LDO signal respectively; Inputting the high-voltage side voltage of the supercapacitor and the first LDO signal into a first DC / DC module to obtain a second voltage for powering the MCU; Inputting the high-voltage side voltage of the supercapacitor and the first LDO signal into the second DC / DC module to obtain a third voltage for powering the communication module; The second LDO signal is input into a third DC / DC module to obtain a fourth voltage for powering the encryption chip.

3. A photovoltaic direct mining and direct control method according to claim 2, characterized in that: The step of inputting the low voltage DC signal into the power monitoring circuit, the first LDO boost circuit and the second LDO circuit through the first super capacitor to obtain the first LDO signal and the second LDO signal respectively includes: The power supply monitoring circuit includes a control switch; When the high-voltage side voltage of the first supercapacitor is greater than or equal to 3.7V, the control switch is in an on state to start the first LDO boost circuit to perform boosting; When the high-voltage side voltage of the first supercapacitor is less than 3.7V, the control switch is in an off state to shut down the first LDO boost circuit, and only the high-voltage side voltage of the first capacitor is used to power the first DCDC module.

4. A photovoltaic direct mining and direct control method according to claim 3, characterized in that: The method of using multiple optocouplers to isolate the multiple photovoltaic grid-connected signals and inputting them into the MCU for storage and encryption, and inputting the multiple photovoltaic grid-connected signals into the master station system through a communication module includes: The MCU is connected to the optocoupler isolation through UART3 to obtain the photovoltaic grid-connected signal; The MCU is connected to the encryption chip and the communication module respectively to control the encryption chip to encrypt the photovoltaic grid-connected signal, and to control the communication module to send the encrypted photovoltaic grid-connected signal to the master station system.

5. A photovoltaic direct mining and direct control method according to claim 4, characterized in that: The method of generating a control strategy of the master station system based on the plurality of photovoltaic grid-connected signals, and feeding back the control strategy to the grid-connected inverter through the MCU and a plurality of 485 transceivers, comprises: The master station system generates a control strategy using the locally stored adjustable and controllable strategy and the photovoltaic grid-connected signals received from the plurality of grid-connected inverters, and sends the control strategy to the MCU; The MCU controls the communication module to receive the control strategy, controls the encryption chip to decrypt the control strategy, and sends the control strategy to the corresponding plurality of grid-connected inverters through optocoupler isolation.

6. A photovoltaic direct collection and control device, characterized in that: The device includes an MCU, a plurality of mutually corresponding 485 transceivers and optical coupler isolation, and a power supply unit; wherein, Multiple 485 transceivers are connected to multiple running grid-connected inverters to collect photovoltaic grid-connected signals; A plurality of optocouplers are used to isolate and input the plurality of photovoltaic grid-connected signals into the MCU for storage and encryption, and the plurality of photovoltaic grid-connected signals are input into the master station system through a communication module; The MCU generates a control strategy for the master station system based on the plurality of photovoltaic grid-connected signals, and feeds the control strategy back to the grid-connected inverter; The power supply unit is used to provide power for the communication process between the plurality of grid-connected inverters and the master station system based on implementing AC-DC conversion.

7. A photovoltaic direct mining and direct control device according to claim 6, characterized in that: In the power supply unit, Convert AC voltage between 100V and 220V into low-voltage DC voltage through AC / DC module; Inputting the low voltage DC signal into an isolated power chip to obtain a first voltage for powering a plurality of 485 transceivers; Inputting the low voltage DC signal into the power supply monitoring circuit, the first LDO boost circuit and the second LDO circuit through the first super capacitor to obtain the first LDO signal and the second LDO signal respectively; Inputting the high-voltage side voltage of the supercapacitor and the first LDO signal into a first DC / DC module to obtain a second voltage for powering the MCU; Inputting the high-voltage side voltage of the supercapacitor and the first LDO signal into the second DC / DC module to obtain a third voltage for powering the communication module; The second LDO signal is input into a third DC / DC module to obtain a fourth voltage for powering the encryption chip.

8. A photovoltaic direct mining and direct control device according to claim 7, characterized in that: The power monitoring circuit includes a control switch; When the high-voltage side voltage of the first supercapacitor is greater than or equal to 3.7V, the control switch is in an on state to start the first LDO boost circuit to perform boosting; When the high-voltage side voltage of the first supercapacitor is less than 3.7V, the control switch is in an off state to shut down the first LDO boost circuit, and only the high-voltage side voltage of the first capacitor is used to power the first DCDC module.

9. A photovoltaic direct mining and direct control device according to claim 8, characterized in that: The MCU is connected to the optocoupler isolation through UART3 to obtain the photovoltaic grid-connected signal; The MCU is connected to the encryption chip and the communication module respectively to control the encryption chip to encrypt the photovoltaic grid-connected signal, and to control the communication module to send the encrypted photovoltaic grid-connected signal to the master station system.

10. A photovoltaic direct mining and direct control device according to claim 9, characterized in that: The master station system generates a control strategy using the locally stored adjustable and controllable strategy and the photovoltaic grid-connected signals received from the plurality of grid-connected inverters, and sends the control strategy to the MCU; The MCU controls the communication module to receive the control strategy, controls the encryption chip to decrypt the control strategy, and sends the control strategy to the corresponding plurality of grid-connected inverters through optocoupler isolation.

11. A terminal comprising a processor and a storage medium; characterized in that: The storage medium is used to store instructions; The processor is configured to operate according to the instructions to execute the steps of the method according to any one of claims 6 to 10.

12. A computer-readable storage medium having a computer program stored thereon, characterized in that: When the program is executed by a processor, the steps of the method according to any one of claims 6 to 10 are implemented.

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