Photovoltaic output power prediction adjusting device and adjusting method based on meteorological parameters

Abstract

The invention discloses a photovoltaic output power prediction adjusting device and adjusting method based on meteorological parameters. The device comprises a photovoltaic power generation system, a photovoltaic power generation control switch device, an energy storage control switch device, an energy storage system, a power distribution network control switch device, an inversion control switch device, a centralized control device, a power distribution network, a rectifying device and an electrical load. The photovoltaic power generation system is connected with an electrical load through a photovoltaic power generation control switch device, and the photovoltaic power generation system is connected with an energy storage system through a rectifying device and an energy storage control switch device; the energy storage system is connected with the power distribution network through the inversion control switch equipment; the power distribution network is connected with an electrical load through the power distribution network control switch equipment; the centralized control device is connected with the photovoltaic power generation control switch device, the energy storage control switch device, the power distribution network control switch device and the inversion control switch device. According to the invention, the problems that the existing distributed photovoltaic and power distribution network voltage cooperative compatibility is poor, and the photovoltaic power generation utilization efficiency cannot be fully exerted are solved.

Description

Technical Field

[0001] The present invention belongs to the technical field of photovoltaic power generation, and in particular relates to a photovoltaic output power prediction and regulation device and a regulation method based on meteorological parameters. Background Art

[0002] In view of the rapid development of distributed power sources, they are large in quantity, highly volatile, poorly controllable, and have a high risk of being disconnected from the grid. At the same time, there is poor coordination and compatibility between distributed photovoltaics and distribution network voltages. The output power of photovoltaic power stations is directly related to weather changes. In order to give full play to the efficiency and utilization efficiency of photovoltaic power generation and reduce the impact of photovoltaic power generation on the voltage of the main distribution network, it is necessary to accurately predict the photovoltaic power generation power, coordinate the power load according to the predicted output power, and further improve the direct utilization efficiency of photovoltaic power generation.

[0003] The Chinese patent with the publication number CN107317353B discloses a voltage control method and system for a distributed photovoltaic power distribution network, including: sorting the distributed photovoltaic power generation voltages connected to the distributed photovoltaic power generation access nodes according to the voltage out-of-bounds status of the distribution network nodes, calculating the reactive power increment of the distributed photovoltaic power generation connected to the first node, and judging whether it is within the adjustment range, if so, using the reactive power increment as the control instruction for the distributed photovoltaic power generation output; if not, judging the remaining nodes in turn according to the sorting, picking out the reactive power increment within the adjustment range; if all reactive power increments are not within the adjustment range, calculating the active power increment of the distributed photovoltaic power generation connected to the first node, and using the active power increment as the control instruction for the distributed photovoltaic power generation output. The invention only adjusts the current power grid status, but fails to fully consider the meteorological forecast data for the next few hours or days, and cannot maximize the potential of photovoltaic power generation. Especially when the light conditions change rapidly, the good opportunity to adjust the photovoltaic power generation output may be missed. Furthermore, the method described in the invention requires detailed control and scheduling of the distributed photovoltaic power generation system, requiring the system to have high intelligence and real-time performance, which may increase the complexity and cost of system design and operation. Summary of the invention

[0004] The present invention provides a photovoltaic output power prediction and regulation device and regulation method based on meteorological parameters, aiming to solve the problem that the existing distributed photovoltaic and distribution network voltage coordination and compatibility are poor and the efficiency and utilization efficiency of photovoltaic power generation cannot be fully exerted.

[0005] In order to solve the above technical problems, the present invention provides a photovoltaic output power prediction and adjustment device based on meteorological parameters, including: a photovoltaic power generation system, a photovoltaic power generation control switch device, an energy storage control switch device, an energy storage system, a distribution network control switch device, an inverter control switch device, a centralized control device, a distribution network, a rectifier device, and a power load.

[0006] The output end of the photovoltaic power generation system is connected to the input end of the power load through the photovoltaic power generation control switch device, and at the same time, the output end of the photovoltaic power generation system is connected to the input end of the energy storage system through the rectifier and the energy storage control switch device; the output end of the energy storage system is connected to the input end of the distribution network through the inverter control switch device; the output end of the distribution network is connected to the input end of the power load through the distribution network control switch device; the output end of the centralized control device is respectively connected to the input ends of the photovoltaic power generation control switch device, the energy storage control switch device, the distribution network control switch device and the inverter control switch device for controlling their disconnection.

[0007] When the output power of the photovoltaic power generation system can meet the power requirement of the power load, the centralized control device controls the photovoltaic power generation control switch device to turn on, and the alternating current generated by the photovoltaic power generation system supplies power to the power load.

[0008] When the output power of the photovoltaic power generation system cannot meet the power requirement of the power load, the centralized control device controls the energy storage control switch device to open, and the alternating current generated by the photovoltaic power generation system is rectified by the rectifier device to charge the energy storage system.

[0009] When the power load is provided with working electricity by the distribution network, if the distribution network and the photovoltaic power generation system cannot meet the power requirements of the power load, the voltage of the distribution network will decrease, resulting in a decrease in the power supply quality of the distribution network. The centralized control device controls the inverter control switch device to turn on, and the energy storage system supplements the distribution network to provide working electricity to the power load, thereby increasing the voltage of the distribution network and improving the power supply quality of the distribution network.

[0010] Preferably, the centralized control device includes a meteorological information receiving module, a load power measuring module, a distribution network control switch device driving module, a microprocessor module, an inverter control switch device driving module, an energy storage control switch device driving module, a photovoltaic power generation control switch device driving module, a communication module, a 4G module, a power supply module, a storage module, and a display module.

[0011] The output ends of the meteorological information receiving module and the load power measurement module are respectively connected to the I / O ports of the microprocessor module input end; the input ends of the distribution network control switch device drive module, the inverter control switch device drive module, the photovoltaic power generation control switch device drive module, and the energy storage control switch device drive module are respectively connected to the I / O ports of the microprocessor module output end; the input end of the communication module is connected to the communication interface of the microprocessor module output end; the output end of the communication module is connected to the input end of the 4G module; the output end of the power supply module is connected to the power supply end of the microprocessor module; the input end of the storage module is connected to the I / O port of the microprocessor module output end; and the input end of the display module is connected to the I / O port of the microprocessor module output end.

[0012] Preferably, the meteorological information receiving module collects weather information in the next week in real time through networking, thereby realizing photovoltaic output prediction power regulation, specifically:

[0013] If the weather is clear and the output power of the photovoltaic power generation system can meet the power requirements of the power load, the centralized control device controls the photovoltaic power generation control switch device to turn on, and the alternating current generated by the photovoltaic power generation system supplies power to the power load.

[0014] If the weather is cloudy and the output power of the photovoltaic power generation system cannot meet the power requirements of the power load, the centralized control device controls the energy storage control switch device to open, and the alternating current generated by the photovoltaic power generation system is rectified by the rectifier device to charge the energy storage system.

[0015] The power of the electricity load is allocated according to the output power of the photovoltaic power generation system predicted by meteorological information, so as to try to directly match the electricity load with the output power of the photovoltaic power generation system and maximize the direct utilization efficiency of the photovoltaic power generation system.

[0016] Preferably, the photovoltaic power generation system includes photovoltaic cells and photovoltaic inverters, and the direct current generated by the photovoltaic cells is converted into 380VAC three-phase alternating current through the photovoltaic inverter.

[0017] The energy storage system includes an energy storage battery and an energy storage inverter device. The energy storage battery stores unit direct current and generates 380VAC three-phase alternating current through the energy storage inverter device.

[0018] Preferably, the power supply of the distribution network is a three-phase rated voltage of 380VAC; the power load is a three-phase rated voltage of 380VAC.

[0019] Preferably, the energy storage control switch device, the distribution network control switch device, the inverter control switch device, and the photovoltaic power generation control switch device use a thyristor fast switching switch, which includes a thyristor and a magnetic holding relay in a parallel structure, and uses an optocoupler as the driving part of the circuit.

[0020] Preferably, when it is detected that the output power of the photovoltaic power generation system cannot meet the power requirement of the power load, the microprocessor module of the centralized control device sends a low-level instruction to the photovoltaic power generation control switch device driver module. After the optocoupler of the photovoltaic power generation control switch device driver module receives the signal, the thyristor and the magnetic holding relay of the photovoltaic power generation control switch device are converted from a closed state to an open state or remain in an open state. If the photovoltaic power generation control switch device was originally a closed device, the magnetic holding relay is disconnected first, and then the thyristor is quickly disconnected to turn off the photovoltaic power generation control switch device, and the photovoltaic power generation system no longer supplies power to the power load; at the same time, the microprocessor module of the centralized control device sends a low-level instruction to the energy storage control switch device driver module. After the optocoupler of the energy storage control switch device driver module receives the signal , the thyristor and magnetic latching relay of the energy storage control switch device are converted from the open state to the closed state, and the thyristor closes quickly first, and then the magnetic latching relay closes. At this time, since the voltage across the thyristor is 0, the thyristor is automatically turned off, the energy storage control switch device is turned on, and the photovoltaic power generation system charges the energy storage system; at the same time, the microprocessor module of the centralized control device sends a low-level instruction to the distribution network control switch device drive module. After the distribution network control switch device drive module optocoupler receives the signal, the thyristor and magnetic latching relay of the distribution network control switch device are converted from the open state to the closed state, and the thyristor is quickly closed first, and then the magnetic latching relay is closed. At this time, since the voltage across the thyristor is 0, the thyristor is automatically turned off, the distribution network control switch device is closed, and the distribution network supplies power to the power load.

[0021] When the power supply of the photovoltaic power generation system can meet the power load demand, the photovoltaic power generation system directly charges the power load through the photovoltaic power generation control switch device, specifically:

[0022] The microprocessor module of the centralized control device sends a low-level command to the photovoltaic power generation control switch device drive module. After the optocoupler of the photovoltaic power generation control switch device drive module receives the signal, the thyristor and magnetic latching relay of the photovoltaic power generation control switch device are converted from the open state to the closed state, and the thyristor is quickly closed first, and then the magnetic latching relay is closed. At this time, since the voltage across the thyristor is 0, the thyristor is automatically turned off, the photovoltaic power generation control switch device is closed, and the photovoltaic power generation system supplies power to the power load.

[0023] If the power supply of the distribution network and the photovoltaic power generation system is insufficient to meet the power load demand, the microprocessor module of the centralized control device sends a low-level command to the energy storage control switch device driver module. After the optocoupler of the energy storage control switch device driver module receives the signal, the thyristor and magnetic latching relay of the energy storage control switch device are converted from the open state to the closed state, and the thyristor is closed quickly first, and then the magnetic latching relay is closed. At this time, since the voltage across the thyristor is 0, the thyristor is automatically turned off, so that the energy storage system can supplement the insufficient power supply of the distribution network to the power load.

[0024] In another aspect, the present invention provides a method for predicting and regulating photovoltaic output power based on meteorological parameters, comprising the following steps:

[0025] When the distribution network supplies power to the power load and the distribution network voltage meets 380VAC±10%, the photovoltaic power generation system charges the energy storage system through the energy storage control switch device; when the distribution network supplies power to the power load and the distribution network voltage does not meet 380VAC±10%, if the photovoltaic power generation system meets the power load power through the forecast, the photovoltaic power generation system directly outputs power to the distribution network through the photovoltaic power generation control switch device to balance the distribution network voltage; when the distribution network supplies power to the power load and the distribution network voltage does not meet 380VAC±10%, if the electricity generated by the photovoltaic power generation system cannot meet the power load power, the energy storage system directly outputs power to the distribution network through the inverter control switch device to balance the distribution network voltage.

[0026] On the other hand, the present invention also provides an electronic device, comprising: a memory, a processor, and a computer program stored in the memory and executable on the processor, wherein when the processor executes the computer program, the photovoltaic output power prediction and regulation method based on meteorological parameters as described in any embodiment of the present invention is implemented.

[0027] On the other hand, the present invention further provides a computer-readable storage medium having a computer program stored thereon, wherein when the computer program is executed by a processor, the method for predicting and regulating photovoltaic output power based on meteorological parameters as described in any embodiment of the present invention is implemented.

[0028] Compared with the prior art, the present invention has the following technical effects:

[0029] 1. The present invention proposes a photovoltaic output power prediction and regulation device based on meteorological parameters. The regulation device obtains meteorological parameter information, combines the power size of the power load, accurately adjusts the voltage of the distribution network, coordinates the photovoltaic power generation system, the energy storage system and the distribution network, dynamically adjusts the distribution of energy according to the meteorological parameter information and the power load demand, automatically adjusts the working state of each unit, and optimizes the operation efficiency of the device.

[0030] 2. The regulating device combines the photovoltaic power generation system and the energy storage system, and intelligently manages the distribution network, effectively improving the stability and reliability of the power grid. The energy storage system can provide backup power when photovoltaic power generation is insufficient or the weather is bad, avoiding the impact on the power load. And by rationally utilizing photovoltaic power generation and energy storage systems and minimizing dependence on the distribution network, long-term energy costs can be reduced, especially during peak hours or in bad weather, reducing the demand for high-cost energy and optimizing the power consumption structure. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] Figure 1 It is an overall structural diagram of the photovoltaic output power prediction and regulation device based on meteorological parameters described in the present invention;

[0032] Figure 2 It is an overall structural diagram of the centralized control device of the present invention;

[0033] Figure 3 is a circuit diagram of a microprocessor module according to the present invention;

[0034] Figure 4 It is the current collection circuit diagram of the present invention;

[0035] Figure 5 It is the voltage acquisition circuit diagram of the present invention;

[0036] Figure 6 It is a schematic diagram of the communication circuit between the three-phase electric energy metering chip and the microprocessor module of the present invention;

[0037] Figure 7 is a circuit diagram of a display module according to the present invention;

[0038] Figure 8 This is the circuit diagram of the thyristor fast switching switch described in the present invention;

[0039] Fig. 9 This is a circuit diagram of the power module described in the present invention. DETAILED DESCRIPTION

[0040] In order to make the objectives, technical solutions and advantages of the present invention more clear, the technical solutions of the present invention will be clearly and completely described below in combination with specific embodiments of the present application and with reference to the accompanying drawings.

[0041] Embodiment 1

[0042] This embodiment provides a photovoltaic output power prediction and adjustment device based on meteorological parameters. Figure 1As shown, it includes: photovoltaic power generation system, photovoltaic power generation control switch equipment, energy storage control switch equipment, energy storage system, distribution network control switch equipment, inverter control switch equipment, centralized control device, distribution network, rectifier device, and power load.

[0043] The output end of the photovoltaic power generation system is connected to the input end of the power load through the photovoltaic power generation control switch device, and at the same time, the output end of the photovoltaic power generation system is connected to the input end of the energy storage system through the rectifier and the energy storage control switch device; the output end of the energy storage system is connected to the input end of the distribution network through the inverter control switch device; the output end of the distribution network is connected to the input end of the power load through the distribution network control switch device; the output end of the centralized control device is respectively connected to the input ends of the photovoltaic power generation control switch device, the energy storage control switch device, the distribution network control switch device and the inverter control switch device for controlling their disconnection.

[0044] When the output power of the photovoltaic power generation system can meet the power requirement of the power load, the centralized control device controls the photovoltaic power generation control switch device to turn on, and the alternating current generated by the photovoltaic power generation system supplies power to the power load.

[0045] When the output power of the photovoltaic power generation system cannot meet the power requirement of the power load, the centralized control device controls the energy storage control switch device to open, and the alternating current generated by the photovoltaic power generation system is rectified by the rectifier device to charge the energy storage system.

[0046] When the power load is provided with working electricity by the distribution network, if the distribution network and the photovoltaic power generation system cannot meet the power requirements of the power load, the voltage of the distribution network will decrease, resulting in a decrease in the power supply quality of the distribution network. The centralized control device controls the inverter control switch device to turn on, and the energy storage system supplements the distribution network to provide working electricity to the power load, thereby increasing the voltage of the distribution network and improving the power supply quality of the distribution network.

[0047] As a preferred implementation of this embodiment, refer to Figure 2 As shown, there are meteorological information receiving module, load power measurement module, distribution network control switch device drive module, microprocessor module, inverter control switch device drive module, energy storage control switch device drive module, photovoltaic power generation control switch device drive module, communication module, 4G module, power module, storage module, and display module.

[0048] The output ends of the meteorological information receiving module and the load power measurement module are respectively connected to the I / O ports of the microprocessor module input end; the input ends of the distribution network control switch device drive module, the inverter control switch device drive module, the photovoltaic power generation control switch device drive module, and the energy storage control switch device drive module are respectively connected to the I / O ports of the microprocessor module output end; the input end of the communication module is connected to the communication interface of the microprocessor module output end; the output end of the communication module is connected to the input end of the 4G module; the output end of the power supply module is connected to the power supply end of the microprocessor module; the input end of the storage module is connected to the I / O port of the microprocessor module output end; and the input end of the display module is connected to the I / O port of the microprocessor module output end.

[0049] The meteorological information receiving module is used to collect meteorological information, mainly including weather conditions (mainly including cloudy or sunny conditions, temperature, wind speed, etc.) within a period of time in the future (generally set to 3 days or a week).

[0050] The load power measurement module is used to measure the real-time power load data of electrical equipment.

[0051] The distribution network control switch device driver module is used to control the distribution network control switch device.

[0052] The inverter control switch device drive module is used to control the inverter control switch device.

[0053] The photovoltaic power generation control switch device driver module is used to control the photovoltaic power generation control switch device.

[0054] The energy storage control switch device drive module is used to control the energy storage control switch device.

[0055] The communication module usually adopts an RS485 module to realize the protocol conversion of communication data between the microprocessor module and the 4G module.

[0056] The 4G module is used to wirelessly transmit meteorological information, load power information, distribution network control switch device driver module working status information, inverter control switch device driver module working status information, inverter control switch device driver module working status information, photovoltaic power generation control switch device driver module working status information, and energy storage control switch device driver module working status information to the data management center.

[0057] The power module is used to supply power to the microprocessor module.

[0058] The storage module is used to store the collected data information.

[0059] The display module is used to display the collected data information.

[0060] For details, see Figure 3As shown, the microprocessor module can use the STM32ZET6 microprocessor, which together with the crystal oscillator circuit and the reset circuit constitutes the basic working system of the single-chip microcomputer. The vibration frequency set by the crystal oscillator circuit is 8MHz. Once started, it will provide a continuous and stable clock signal for the single-chip microcomputer to ensure its normal operation. The function of the reset circuit is to trigger the single-chip microcomputer to reset when the RESET pin of the single-chip microcomputer receives a low level. In order to improve the stability of the system, a decoupling capacitor circuit is also specially designed. This circuit can effectively absorb the high-frequency noise on the power line, thereby stabilizing the power supply voltage, ensuring the stability of the power supply of the entire prediction and regulation device during operation, and avoiding the influence of power supply fluctuations on its performance. In the power supply system, the distribution network first provides power to the power load. The microprocessor STM32F103ZET6 controls the entire process. It sends a trigger signal and amplifies it through a level conversion circuit. The high and low levels of the signal determine the conduction state of the optocoupler: the optocoupler is not turned on when the high level is high, and it is turned on when the low level is low. Once the optocoupler is turned on, the thyristor of the distribution network control switch will open quickly, allowing the distribution network to supply power to the load. Subsequently, the magnetic latching relay of the distribution network control switch device is activated, and the thyristor is closed after completing the power supply task to reduce energy loss.

[0061] See also Figure 4 , Figure 5 As shown, the load power measurement module includes a current acquisition unit, a voltage acquisition unit and a three-phase electric energy metering chip. The current acquisition unit collects the current value of the photovoltaic power generation system and the power load through a current measurement sensor. The voltage acquisition unit collects the voltage value of the photovoltaic power generation system, the distribution network and the power load through a voltage acquisition circuit. The three-phase electric energy metering chip can be selected as RN8302B.

[0062] The current measurement sensor uses three 200A / 5A through-type current transformers, and is connected to the input terminals IA12 and IA11 of the HCT226JY current transformer through the output terminals of the transformer, and then output to the corresponding input port of the electric energy metering chip RN8302B. The collected signal is collected by ADC, and the current value of photovoltaic power generation and power load is obtained after conversion. The voltage acquisition circuit uses the ZMPT107 current type voltage transformer with an input-output ratio of 1:1, and a 110K resistor is connected in series at the input end of the voltage transformer to convert the AC 220VAC voltage into an AC 2mA current. The three-phase metering chip collects the voltage values ​​of Va1 and Va1n, Vb1 and Vb1n, Vc1 and Vc1n to calculate the voltage value.

[0063] See also Figure 6As shown in the figure, the RN8302B three-phase energy metering chip adopts 3.3V voltage power supply, and is matched with the peripheral minimum system circuit to provide the chip with a stable clock frequency, and by selecting 0.1uf and 10pf capacitors to filter high and low frequency interference signals, the signal is smooth and stable. The SDO pin of the three-phase energy metering chip corresponds to the MISO pin of the microprocessor module, the SDI pin corresponds to the MOSI pin of the microprocessor module, and the SCLK pin is connected to the SCK pin of the microprocessor module to ensure the integrity and synchronization of the timing. The SPI communication protocol is used between the two, and software simulation is used to realize communication. The corresponding byte data is sent through the protocol to obtain the value stored in the corresponding register of the three-phase energy metering chip. On this basis, the calculation of electric energy can be completed and it can be judged whether the current power supply system can meet the power requirements of the power load.

[0064] See also Figure 7 As shown in the figure, the display module is connected to the Tao Jingchi serial screen through the LCD rx / tx pins, and the data sent by the serial screen is received by configuring the MCU TX / RX pins to complete the data processing. In addition, the program download port can also communicate with peripherals through the SWCLK and SWDIO pins to download the system program.

[0065] As a preferred implementation of this embodiment, the meteorological information collection module collects future weather information in real time through networking, thereby realizing photovoltaic output prediction power adjustment, specifically:

[0066] If the weather is clear and the output power of the photovoltaic power generation system can meet the power requirements of the power load, the centralized control device controls the photovoltaic power generation control switch device to turn on, and the alternating current generated by the photovoltaic power generation system supplies power to the power load.

[0067] If the weather is cloudy and the output power of the photovoltaic power generation system cannot meet the power requirements of the power load, the centralized control device controls the energy storage control switch device to open, and the AC power generated by the photovoltaic power generation system is rectified by the rectifier device to charge the energy storage system. Specifically, taking the roof of a commercial house with photovoltaic solar panels as an example, when the photovoltaic solar panels are in clear weather, the three-phase power metering chip of the load power measurement module determines that the power of the photovoltaic power generation system meets the needs of the household power load, and converts the stored power into 220VAC AC power required by household users. However, if the weather forecast of the meteorological acquisition module is cloudy, the photovoltaic system calculates that the power generation power cannot meet the power load through the three-phase power metering chip, and immediately switches to the distribution network for power supply, stops the photovoltaic power generation system from supplying power to the power load, and at this time the photovoltaic power generation system charges the energy storage system until the next time the power meets the power load.

[0068] According to the output power of the photovoltaic power generation system predicted by meteorological information, the power of the power load is allocated to try to directly match the power load with the output power of the photovoltaic power generation system, so as to maximize the direct utilization efficiency of the photovoltaic power generation system. Specifically, the specific data of the current and voltage of the three-phase power metering chip are obtained through the microprocessor module, and the calculation is used to determine whether the power of the current photovoltaic power generation system meets the power load requirements. If it does, the output power of the photovoltaic power generation system is directly used. However, if it is rainy weather and the output power of the photovoltaic system decreases, the microprocessor module will output high and low levels through the IO port when judging that the photovoltaic power generation system is insufficient. The level conversion circuit can boost 3.3V to 12V to turn off or turn on the optocoupler of the photovoltaic power generation system to cut off the power supply line, and at the same time turn on the control switch equipment of other systems to predict the output power and adjust it according to meteorological parameters.

[0069] As a preferred implementation of this embodiment, the photovoltaic power generation system includes a photovoltaic cell and a photovoltaic inverter. The direct current generated by the photovoltaic cell is converted into 380VAC three-phase alternating current through the photovoltaic inverter.

[0070] The energy storage system includes an energy storage battery and an energy storage inverter device. The energy storage battery stores unit direct current and generates 380VAC three-phase alternating current through the energy storage inverter device.

[0071] As a preferred implementation of this embodiment, the power supply of the distribution network is a three-phase rated voltage of 380VAC; the power load is a three-phase rated voltage of 380VAC.

[0072] As a preferred implementation of this embodiment, the energy storage control switch device, the distribution network control switch device, and the energy storage control switch device use a thyristor fast switching switch, see Figure 8 As shown, the thyristor fast switching switch includes a thyristor and a magnetic latching relay in a parallel structure, and adopts a parallel structure, and uses an optocoupler as the driving part of the circuit. The driving part of the circuit can use the optocoupler MOC3051SM, and the 1N4148 diode ensures the bidirectional conductivity of the thyristor. A 200KΩ power resistor is connected in series behind the magnetic latching relay to achieve the current limiting function. When the power of the photovoltaic power generation system can meet the power demand of the power load, the regulating device will perform the switching operation. This process is controlled by the microprocessor module of the centralized control device, which sends a trigger signal. After the signal passes through the level conversion circuit, if a low-level signal is received, the optocoupler will be turned on. Once the optocoupler is turned on, the centralized control module will turn on the thyristor and magnetic latching relay of the distribution network control switch device in turn, and then turn off the thyristor of the distribution network control switch device to reduce energy loss.

[0073] For further information, see Fig. 9As shown, the power module includes an AC power supply circuit and a step-down conversion circuit. The AC power supply circuit uses a variety of components to ensure the safety and stability of the circuit. The fuse, thermistor, varistor and safety capacitor contained in the circuit work together to prevent the circuit from being damaged by excessive current and control the surge voltage that may be encountered within a safe range. In addition, the common-mode inductor is used to suppress the common-mode noise in the circuit to protect the circuit from interference. One of the core components is the 220V to 12V transformer, which is responsible for converting high-voltage AC power into lower-voltage DC power. The step-down conversion circuit of the power module further includes two conversion circuits: 12V to 5V and 5V to 3.3V. These conversion circuits ensure that different parts of the circuit can obtain the voltage levels they need, thereby achieving precise power supply. Through such a design, the entire circuit can not only resist abnormal fluctuations in current and voltage, but also provide stable and suitable power for various electronic devices.

[0074] As a preferred implementation mode of this embodiment, when it is detected that the output power of the photovoltaic power generation system cannot meet the power requirement of the power load, the microprocessor module of the centralized control device sends a low-level instruction to the photovoltaic power generation control switch device driver module. After the optocoupler of the photovoltaic power generation control switch device driver module receives the signal, the thyristor and the magnetic holding relay of the photovoltaic power generation control switch device are converted from a closed state to an open state or remain in an open state. If the photovoltaic power generation control switch device is originally a closed device, the magnetic holding relay is disconnected first, and then the thyristor is quickly disconnected to turn off the photovoltaic power generation control switch device, and the photovoltaic power generation system no longer supplies power to the power load; at the same time, the microprocessor module of the centralized control device sends a low-level instruction to the energy storage control switch device driver module, and the optocoupler of the energy storage control switch device driver module After receiving the signal, the thyristor and magnetic latching relay of the energy storage control switch device are converted from the open state to the closed state, and the thyristor is closed quickly first, and then the magnetic latching relay is closed. At this time, since the voltage across the thyristor is 0, the thyristor is automatically turned off, the energy storage control switch device is turned on, and the photovoltaic power generation system charges the energy storage system; at the same time, the microprocessor module of the centralized control device sends a low-level instruction to the distribution network control switch device drive module. After the optical coupler of the distribution network control switch device drive module receives the signal, the thyristor and magnetic latching relay of the distribution network control switch device are converted from the open state to the closed state, and the thyristor is closed quickly first, and then the magnetic latching relay is closed. At this time, since the voltage across the thyristor is 0, the thyristor is automatically turned off, the distribution network control switch device is closed, and the distribution network supplies power to the power load.

[0075] When the power supply of the photovoltaic power generation system can meet the power load demand, the photovoltaic power generation system directly charges the power load through the photovoltaic power generation control switch device, specifically:

[0076] The microprocessor module of the centralized control device sends a low-level command to the photovoltaic power generation control switch device drive module. After the optocoupler of the photovoltaic power generation control switch device drive module receives the signal, the thyristor and magnetic latching relay of the photovoltaic power generation control switch device are converted from the open state to the closed state, and the thyristor is quickly closed first, and then the magnetic latching relay is closed. At this time, since the voltage across the thyristor is 0, the thyristor is automatically turned off, the photovoltaic power generation control switch device is closed, and the photovoltaic power generation system supplies power to the power load.

[0077] If the power supply of the distribution network and the photovoltaic power generation system is insufficient to meet the power load demand, the microprocessor module of the centralized control device sends a low-level command to the energy storage control switch device driver module. After the optocoupler of the energy storage control switch device driver module receives the signal, the thyristor and magnetic latching relay of the energy storage control switch device are converted from the open state to the closed state, and the thyristor is quickly closed first, and then the magnetic latching relay is closed. At this time, since the voltage across the thyristor is 0, the thyristor is automatically turned off, so that the energy storage system can supplement the insufficient power supply of the distribution network to the power load and avoid energy loss.

[0078] Embodiment 2

[0079] Accordingly, this embodiment provides a method for predicting and adjusting photovoltaic output power based on meteorological parameters, comprising the following steps:

[0080] When the distribution network supplies power to the power load and the distribution network voltage meets 380VAC±10%, the photovoltaic power generation system charges the energy storage system through the energy storage control switch device; when the distribution network supplies power to the power load and the distribution network voltage does not meet 380VAC±10%, if the photovoltaic power generation system meets the power load power through the forecast, the photovoltaic power generation system directly outputs power to the distribution network through the photovoltaic power generation control switch device to balance the distribution network voltage; when the distribution network supplies power to the power load and the distribution network voltage does not meet 380VAC±10%, if the electricity generated by the photovoltaic power generation system cannot meet the power load power, the energy storage system directly outputs power to the distribution network through the inverter control switch device to balance the distribution network voltage.

[0081] Embodiment 3

[0082] This embodiment provides an electronic device, which includes: a memory, a processor, and a computer program stored in the memory and executable on the processor, wherein the processor implements the photovoltaic output power prediction and regulation method based on meteorological parameters as described in any embodiment of the present invention when executing the computer program.

[0083] Embodiment 4

[0084] This embodiment provides a computer-readable storage medium having a computer program stored thereon. When the computer program is executed by a processor, the photovoltaic output power prediction and regulation method based on meteorological parameters as described in any embodiment of the present invention is implemented.

[0085] In the embodiments of the present application, "at least one" refers to one or more, and "more than one" refers to two or more. "And / or" describes the association relationship of associated objects, indicating that three relationships may exist. For example, A and / or B can represent the existence of A alone, the existence of A and B at the same time, and the existence of B alone. Among them, A and B can be singular or plural. The character " / " generally indicates that the previous and next associated objects are in an "or" relationship. "At least one of the following" and similar expressions refer to any combination of these items, including any combination of single or plural items. For example, at least one of a, b and c can be represented by: a, b, c, a and b, a and c, b and c, or a and b and c, where a, b, c can be single or multiple.

[0086] Those of ordinary skill in the art will appreciate that the various units and algorithm steps described in the embodiments disclosed herein can be implemented in a combination of electronic hardware, computer software, and electronic hardware. Whether these functions are performed in hardware or software 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.

[0087] Those skilled in the art can clearly understand that, for the convenience and brevity of description, the specific working processes of the systems, devices and units described above can refer to the corresponding processes in the aforementioned method embodiments and will not be repeated here.

[0088] In several embodiments provided in the present application, if any function is implemented in the form of a software functional unit and sold or used as an independent product, it can be stored in a computer-readable storage medium. Based on this understanding, the technical solution of the present application, or the part that contributes to the prior art or the part of the technical solution, can be embodied in the form of a software product, which is stored in a storage medium and includes several instructions for a computer device (which can be a personal computer, a server, or a network device, etc.) to perform all or part of the steps of the method described in each embodiment of the present application. The aforementioned storage medium includes: U disk, mobile hard disk, read-only memory (Read-Only Memory; hereinafter referred to as: ROM), random access memory (Random Access Memory; hereinafter referred to as: RAM), disk or optical disk, and other media that can store program codes.

[0089] The above descriptions are merely embodiments of the present invention and are not intended to limit the patent scope of the present invention. Any equivalent structure or equivalent process transformation made using the contents of the present invention specification and drawings, or directly or indirectly applied in other related technical fields, are also included in the patent protection scope of the present invention.

Claims

1. A photovoltaic output power prediction and adjustment device based on meteorological parameters, characterized in that: include: Photovoltaic power generation system, photovoltaic power generation control switch equipment, energy storage control switch equipment, energy storage system, distribution network control switch equipment, inverter control switch equipment, centralized control device, distribution network, rectifier device, power load; The output end of the photovoltaic power generation system is connected to the input end of the power load through the photovoltaic power generation control switch device, and at the same time, the output end of the photovoltaic power generation system is connected to the input end of the energy storage system through the rectifier and the energy storage control switch device; the output end of the energy storage system is connected to the input end of the distribution network through the inverter control switch device; the output end of the distribution network is connected to the input end of the power load through the distribution network control switch device; the output end of the centralized control device is respectively connected to the input ends of the photovoltaic power generation control switch device, the energy storage control switch device, the distribution network control switch device and the inverter control switch device, so as to control their disconnection; When the output power of the photovoltaic power generation system can meet the power requirements of the power load, the centralized control device controls the photovoltaic power generation control switch device to turn on, and the alternating current generated by the photovoltaic power generation system supplies power to the power load; When the output power of the photovoltaic power generation system cannot meet the power requirements of the power load, the centralized control device controls the energy storage control switch device to open, and the alternating current generated by the photovoltaic power generation system is rectified by the rectifier device to charge the energy storage system; When the power load is provided with working electricity by the distribution network, if the distribution network and the photovoltaic power generation system cannot meet the power requirements of the power load, the voltage of the distribution network will decrease, resulting in a decrease in the power supply quality of the distribution network. The centralized control device controls the inverter control switch device to turn on, and the energy storage system supplements the distribution network to provide working electricity to the power load, thereby increasing the voltage of the distribution network and improving the power supply quality of the distribution network.

2. The photovoltaic output power prediction and adjustment device based on meteorological parameters according to claim 1 is characterized in that: The centralized control device includes a meteorological information receiving module, a load power measurement module, a distribution network control switch device driving module, a microprocessor module, an inverter control switch device driving module, an energy storage control switch device driving module, a photovoltaic power generation control switch device driving module, a communication module, a 4G module, a power module, a storage module, and a display module; The output ends of the meteorological information receiving module and the load power measurement module are respectively connected to the I / O ports of the microprocessor module input end; the input ends of the distribution network control switch device drive module, the inverter control switch device drive module, the photovoltaic power generation control switch device drive module, and the energy storage control switch device drive module are respectively connected to the I / O ports of the microprocessor module output end; the input end of the communication module is connected to the communication interface of the microprocessor module output end; the output end of the communication module is connected to the input end of the 4G module; the output end of the power supply module is connected to the power supply end of the microprocessor module; the input end of the storage module is connected to the I / O port of the microprocessor module output end; and the input end of the display module is connected to the I / O port of the microprocessor module output end.

3. The photovoltaic output power prediction and adjustment device based on meteorological parameters according to claim 2 is characterized in that: The meteorological information receiving module collects weather information for the next week in real time through networking, thereby realizing photovoltaic output prediction power regulation, specifically: If the weather is clear and the output power of the photovoltaic power generation system can meet the power requirements of the power load, the centralized control device controls the photovoltaic power generation control switch device to turn on, and the AC power generated by the photovoltaic power generation system supplies power to the power load; If the weather is cloudy and the output power of the photovoltaic power generation system cannot meet the power requirements of the power load, the centralized control device controls the energy storage control switch device to open, and the alternating current generated by the photovoltaic power generation system is rectified by the rectifier device to charge the energy storage system; The power of the electricity load is allocated according to the output power of the photovoltaic power generation system predicted by meteorological information, so as to try to directly match the electricity load with the output power of the photovoltaic power generation system and maximize the direct utilization efficiency of the photovoltaic power generation system.

4. The photovoltaic output power prediction and adjustment device based on meteorological parameters according to claim 1, characterized in that: The photovoltaic power generation system includes a photovoltaic cell and a photovoltaic inverter. The direct current generated by the photovoltaic cell is converted into 380VAC three-phase alternating current through the photovoltaic inverter. The energy storage system includes an energy storage battery and an energy storage inverter device. The energy storage battery stores unit direct current and generates 380VAC three-phase alternating current through the energy storage inverter device.

5. The photovoltaic output power prediction and adjustment device based on meteorological parameters according to claim 1, characterized in that: The power supply of the distribution network is a three-phase rated voltage of 380VAC; the power load is a three-phase rated voltage of 380VAC.

6. The photovoltaic output power prediction and adjustment device based on meteorological parameters according to claim 1, characterized in that: Energy storage control switch equipment, distribution network control switch equipment, inverter control switch equipment, photovoltaic power generation control switch equipment adopt thyristor fast switching switch, which includes thyristor and magnetic latching relay in parallel structure, and uses optocoupler as the driving part of the circuit.

7. The photovoltaic output power prediction and adjustment device based on meteorological parameters according to claim 6 is characterized in that: When it is detected that the output power of the photovoltaic power generation system cannot meet the power requirement of the power load, the microprocessor module of the centralized control device sends a low-level command to the photovoltaic power generation control switch device driver module. After the optocoupler of the photovoltaic power generation control switch device driver module receives the signal, the thyristor and the magnetic holding relay of the photovoltaic power generation control switch device are converted from the closed state to the open state or remain in the open state. If the photovoltaic power generation control switch device is originally in the closed state, the magnetic holding relay is disconnected first, and then the thyristor is quickly disconnected to turn off the photovoltaic power generation control switch device, and the photovoltaic power generation system no longer supplies power to the power load; at the same time, the microprocessor module of the centralized control device sends a low-level command to the energy storage control switch device driver module. After the optocoupler of the energy storage control switch device driver module receives the signal, the storage The thyristor and magnetic latching relay of the switch device can be controlled to change from the open state to the closed state, and the thyristor is quickly closed first, and then the magnetic latching relay is closed. At this time, since the voltage across the thyristor is 0, the thyristor is automatically turned off, and the energy storage control switch device is turned on, and the photovoltaic power generation system charges the energy storage system; at the same time, the microprocessor module of the centralized control device sends a low-level instruction to the distribution network control switch device drive module. After the optical coupler of the distribution network control switch device drive module receives the signal, the thyristor and magnetic latching relay of the distribution network control switch device are converted from the open state to the closed state, and the thyristor is quickly closed first, and then the magnetic latching relay is closed. At this time, since the voltage across the thyristor is 0, the thyristor is automatically turned off, the distribution network control switch device is closed, and the distribution network supplies power to the power load; When the power supply of the photovoltaic power generation system can meet the power load demand, the photovoltaic power generation system directly charges the power load through the photovoltaic power generation control switch device, specifically: The microprocessor module of the centralized control device sends a low-level command to the photovoltaic power generation control switch device drive module. After the optocoupler of the photovoltaic power generation control switch device drive module receives the signal, the thyristor and the magnetic latching relay of the photovoltaic power generation control switch device are converted from the open state to the closed state, and the thyristor is quickly closed first, and then the magnetic latching relay is closed. At this time, since the voltage across the thyristor is 0, the thyristor is automatically turned off, the photovoltaic power generation control switch device is closed, and the photovoltaic power generation system supplies power to the power load; If the power supply of the distribution network and the photovoltaic power generation system is insufficient to meet the power load demand, the microprocessor module of the centralized control device sends a low-level command to the energy storage control switch device driver module. After the optocoupler of the energy storage control switch device driver module receives the signal, the thyristor and magnetic latching relay of the energy storage control switch device are converted from the open state to the closed state, and the thyristor is closed quickly first, and then the magnetic latching relay is closed. At this time, since the voltage across the thyristor is 0, the thyristor is automatically turned off, so that the energy storage system can supplement the insufficient power supply of the distribution network to the power load.

8. A photovoltaic output power prediction and adjustment method based on meteorological parameters, characterized in that: The method is implemented based on the photovoltaic output power prediction and regulation device based on meteorological parameters according to any one of claims 1 to 7, and comprises the following steps: When the distribution network supplies power to the power load and the distribution network voltage meets 380VAC±10%, the photovoltaic power generation system charges the energy storage system through the energy storage control switch device; when the distribution network supplies power to the power load and the distribution network voltage does not meet 380VAC±10%, if the photovoltaic power generation system meets the power load power through the forecasted power supply, the photovoltaic power generation system directly outputs power to the power load through the photovoltaic power generation control switch device to balance the distribution network voltage; when the distribution network supplies power to the power load and the distribution network voltage does not meet 380VAC±10%, if the electric energy generated by the photovoltaic power generation system cannot meet the power load power, the energy storage system directly outputs power to the distribution network through the inverter control switch device to balance the distribution network voltage.

9. An electronic device, comprising: A memory, a processor, and a computer program stored in the memory and executable on the processor, wherein the processor implements the photovoltaic output power prediction and regulation method based on meteorological parameters as described in claim 8 when executing the computer program.

10. A computer-readable storage medium having a computer program stored thereon, characterized in that: When the computer program is executed by a processor, the photovoltaic output power prediction and regulation method based on meteorological parameters as claimed in claim 8 is implemented.

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