Photovoltaic grid-connected configuration-free system and method

Abstract

The present invention proposes a photovoltaic grid-connected configuration-free system, which is communicatively connected to a power dispatching main station. The photovoltaic inverter acquisition module converts the collected telemetry data and telesignaling data of the photovoltaic inverter into a unified photovoltaic acquisition protocol, and sends the converted telemetry data and telesignaling data of the photovoltaic inverter to the power dispatching main station; the power dispatching main station generates a power generation active control target value according to the telemetry data and telesignaling data of the photovoltaic inverter, and sends the generated power generation active control target value to an automatic power generation control module through a communication module; the automatic power generation control module is used to configure the output active power of multiple photovoltaic inverters so that the power generation active power change values ​​of all photovoltaic inverters reach the power generation active target value. The present invention also proposes a photovoltaic grid-connected configuration-free method, which effectively improves the distributed photovoltaic grid-connected configuration efficiency and reduces the configuration difficulty.

Description

Technical Field

[0001] The present invention relates to the field of distributed photovoltaic grid-connected access, and in particular to a photovoltaic grid-connected configuration-free system and method. Background Art

[0002] At present, the new power system with new energy as the main body has entered a period of rapid development. Distributed photovoltaic stations constitute an important power supply support for regional power grids, and their impact on the safe operation of power grids is increasing. According to national standards, industry standards, grid-connected dispatching agreements and other relevant regulations, grid-connected plants and stations should be responsible for the operation and maintenance of the power monitoring system at the plant and station end, ensuring that relevant plant and station operation information that meets the requirements is transmitted to the dispatching automation system of the control agency to meet the dispatching and operation requirements of the power grid. However, due to factors such as natural conditions, technical economy, and operation and maintenance management, the data channels of some plants and stations are missing, interrupted or abnormal, and the station operation data required for the operation of the power grid cannot be transmitted as required, which affects the observation and control capabilities of the power grid control personnel on the power grid, is not conducive to the consumption of new energy and power balance, and in serious cases affects the safe and stable operation of the power grid.

[0003] Large-scale development of distributed photovoltaics and high-proportion grid connection, fully realizing the "observable, measurable, adjustable and controllable" distributed photovoltaics, using information and digital technologies to solve problems related to grid absorption and grid connection services, and doing a good job in power generation output forecasting, power balance and real-time dispatch are necessary measures to ensure the safe and stable operation of the power grid.

[0004] The current power grid cannot directly manage photovoltaic inverters. Usually, it uses connected electricity meters to obtain current power generation parameters, and cannot regulate photovoltaic inverters. To achieve "observable, measurable, adjustable and controllable", it is necessary to directly manage photovoltaic inverters and realize the functions of power grid dispatching telemetry, remote control and remote regulation.

[0005] At present, there are many photovoltaic inverter manufacturers and the protocols are not standardized. The installation locations of distributed photovoltaic inverters are scattered and the number is large. If unified access is to be achieved, on the one hand, it is necessary to configure the protocol in the power dispatching master station to identify the data of photovoltaic inverters from different manufacturers; on the other hand, it is necessary to configure the active power regulation of multiple photovoltaic inverters. However, this is generally done by manually configuring the active power that needs to be regulated for each photovoltaic inverter based on empirical values, which makes the distributed photovoltaic grid-connected configuration difficult and inefficient.

[0006] In view of this problem, the present invention provides a photovoltaic grid-connected configuration-free system and method to solve the above problem. Summary of the invention

[0007] In order to solve the problems existing in the prior art, the present invention innovatively proposes a photovoltaic grid-connected configuration-free system and method, which effectively solves the problems of difficulty and low efficiency in distributed photovoltaic grid-connected configuration caused by the prior art, effectively improves the distributed photovoltaic grid-connected configuration efficiency and reduces the configuration difficulty.

[0008] The first aspect of the present invention provides a photovoltaic grid-connected configuration-free system, which is communicatively connected to a power dispatching main station, and includes: a photovoltaic inverter acquisition module, an automatic power generation control module, and a communication module. The photovoltaic inverter acquisition module is used to collect telemetry data and telesignaling data of photovoltaic inverters, convert the collected telemetry data and telesignaling data of photovoltaic inverters into a unified photovoltaic acquisition protocol, and send the converted telemetry data and telesignaling data of photovoltaic inverters to the power dispatching main station through the communication module; the power dispatching main station is used to receive the converted telemetry data and telesignaling data of photovoltaic inverters, generate a power generation active power regulation target value according to the telemetry data and telesignaling data of photovoltaic inverters, and send the generated power generation active power regulation target value to the automatic power generation control module through the communication module; the automatic power generation control module is used to configure the output active power of multiple photovoltaic inverters so that the power generation active power change values ​​of all photovoltaic inverters reach the power generation active power target value.

[0009] Optionally, it also includes: an encryption module, which is communicatively connected to the photovoltaic inverter acquisition module and the communication module respectively, and is used to receive and encrypt the converted telemetry data and telesignal data of the photovoltaic inverter sent by the photovoltaic inverter acquisition module, and send the encrypted converted telemetry data and telesignal data of the photovoltaic inverter to the power dispatching main station through the communication module.

[0010] Optionally, the photovoltaic inverter acquisition module includes several acquisition sub-modules and several protocol conversion sub-modules. The acquisition sub-module obtains model information, telemetry data and telesignaling data of each photovoltaic inverter, determines the manufacturer information corresponding to the photovoltaic inverter and the data protocol information corresponding to the manufacturer information according to the model information, calls the corresponding protocol conversion sub-module according to the data protocol information of each photovoltaic inverter, and converts the protocols of the telemetry data and telesignaling data into a unified photovoltaic acquisition protocol.

[0011] Furthermore, the number of the acquisition submodules corresponds to the number of photovoltaic inverters, and the number of the protocol conversion submodules corresponds to the number of manufacturers of photovoltaic inverters.

[0012] Optionally, the telemetry data includes active power, reactive power, voltage and current of the photovoltaic inverter, and the telesignaling data includes switch position and knife switch position.

[0013] Optionally, the power dispatching master station is used to receive the telemetry data and telesignaling data of the photovoltaic inverter after protocol conversion, and to generate the power generation active power regulation target value according to the telemetry data and telesignaling data of the photovoltaic inverter:

[0014] The power dispatching master station receives the converted telemetry data and telesignaling data of the photovoltaic inverter, determines the current output active power of all photovoltaic inverters according to the telemetry data and telesignaling data of the photovoltaic inverter, and generates the active power generation control target value according to the current active power of all photovoltaic inverters.

[0015] Optionally, the automatic power generation control module is also communicated with the photovoltaic inverter acquisition module to obtain the telemetry data and telesignaling data of the converted photovoltaic inverter, determine the current active power of each photovoltaic inverter according to the telemetry data and telesignaling data, and configure the output active power of multiple photovoltaic inverters according to the active power generation regulation target value issued by the power dispatching master station and the current active power of each photovoltaic inverter so that the active power change value of all photovoltaic inverters reaches the active power generation regulation target value.

[0016] Optionally, configuring the output active power of multiple inverters according to the active power control target value issued by the power dispatching master station and the current active power of each photovoltaic inverter so that the power generation power reaches the active power target value specifically includes:

[0017] A photovoltaic inverter that meets the preset conditions is used as a sample machine, and the currently collected active power output of the sample machine is used as the maximum active power output at the current moment;

[0018] According to the maximum active power output at the current moment and the current active power output of the photovoltaic inverter, the current increaseable active power output and the current decreaseable active power output of each photovoltaic inverter are determined;

[0019] According to the current increaseable active power output and the current decreaseable active power output of the photovoltaic inverters, they are sorted from large to small. When the power dispatching master station sends the target value of active power generation regulation, the photovoltaic inverters are regulated one by one according to the sorting until the target value of active power generation regulation is reached.

[0020] Furthermore, when the power dispatching master station sends the target value for active power generation regulation, the control is performed one by one according to the order of the photovoltaic inverters until the target value for active power generation regulation is reached. Specifically,

[0021] When the power dispatching master station sends the target value for active power generation regulation, the photovoltaic inverters with the highest ranking are preferentially traversed to regulate the output active power output, so as to achieve the regulation participation of the minimum number of photovoltaic inverters and achieve the target value for active power generation regulation.

[0022] The second aspect of the present invention provides a photovoltaic grid-connected configuration-free method, which is implemented based on the photovoltaic grid-connected configuration-free system described in the first aspect of the present invention, and includes:

[0023] The photovoltaic inverter acquisition module collects the telemetry data and telesignal data of the photovoltaic inverter, converts the collected telemetry data and telesignal data of the photovoltaic inverter into a unified photovoltaic acquisition protocol, and sends the converted telemetry data and telesignal data of the photovoltaic inverter to the power dispatching master station;

[0024] The power dispatching master station is used to receive the converted telemetry data and telesignaling data of the photovoltaic inverter, generate the active power generation control target value according to the telemetry data and telesignaling data of the photovoltaic inverter, and send the generated active power generation control target value to the automatic power generation control module through the communication module;

[0025] The automatic power generation control module is used to configure the output active power output of multiple photovoltaic inverters so that the comprehensive power generation active power output of all photovoltaic inverters reaches the power generation active target value.

[0026] The technical solution adopted by the present invention includes the following technical effects:

[0027] 1. In the technical solution of the present invention, the photovoltaic inverter acquisition module is used to collect the telemetry data and telesignaling data of the photovoltaic inverter, convert the collected telemetry data and telesignaling data of the photovoltaic inverter into a unified photovoltaic acquisition protocol, and send the converted telemetry data and telesignaling data of the photovoltaic inverter to the power dispatching master station; the power dispatching master station is used to receive the converted telemetry data and telesignaling data of the photovoltaic inverter, generate the power generation active control target value according to the telemetry data and telesignaling data of the photovoltaic inverter, and send the generated power generation active control target value to the automatic power generation control module through the communication module; the automatic power generation control module is used to configure the output active power of multiple photovoltaic inverters so that the power generation active power change value of all photovoltaic inverters reaches the power generation active target value, realizes the automatic regulation and control and management of each photovoltaic inverter, effectively solves the problem of large difficulty and low efficiency of distributed photovoltaic grid-connected configuration caused by the prior art, effectively improves the distributed photovoltaic grid-connected configuration efficiency, and reduces the configuration difficulty.

[0028] 2. The system in the technical solution of the present invention also includes: an encryption module, which receives and encrypts the telemetry data and telesignaling data of the converted photovoltaic inverter sent by the photovoltaic inverter acquisition module, and sends the encrypted telemetry data and telesignaling data of the converted photovoltaic inverter to the power dispatching main station through the communication module, thereby improving the reliability and security of communication between the power grid photovoltaic inverter and the power dispatching main station.

[0029] 3. The photovoltaic inverter acquisition module in the technical solution of the present invention includes several acquisition sub-modules and several protocol conversion sub-modules. The acquisition sub-module obtains the model information of each photovoltaic inverter, determines the manufacturer information corresponding to the photovoltaic inverter and the data protocol information corresponding to the manufacturer information according to the model information, calls the corresponding protocol conversion sub-module according to the data protocol information of each photovoltaic inverter, and converts the protocol of telemetry data and telesignaling data into a unified photovoltaic acquisition protocol; standardizes the photovoltaic access standards of different manufacturers, realizes the unified access of various photovoltaic inverters, and reduces the difficulty and cost of operation and maintenance.

[0030] 4. In the technical solution of the present invention, the automatic power generation control module obtains the telemetry data and telesignaling data of the converted photovoltaic inverter, determines the current active power of each photovoltaic inverter according to the telemetry data and telesignaling data, and sorts them from large to small according to the current increaseable active power output and the current decreaseable active power output of the photovoltaic inverter. When the power dispatching main station sends the power generation active power regulation target value, the photovoltaic inverter with the front ranking is preferentially traversed to regulate the output active power output, so as to achieve the output power target value required by the power dispatching agency with the least number of photovoltaic inverters participating in the regulation, the least number of adjustments, and the fastest adjustment speed, providing strong technical support for realizing the "adjustable and controllable" low-voltage distributed power supply.

[0031] It is to be understood that the foregoing general description and the following detailed description are exemplary and explanatory only and are not restrictive of the invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0032] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, for ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0033] Figure 1 A schematic diagram of the structure of a system in Example 1 of the solution of the present invention;

[0034] Figure 2 Another structural diagram of the system of Example 1 in the solution of the present invention;

[0035] Figure 3 This is a schematic diagram of the structure of a photovoltaic inverter acquisition module in a system of Embodiment 1 of the present invention;

[0036] Figure 4 This is a schematic diagram of the overall process executed by the system in Example 1 of the solution of the present invention;

[0037] Figure 5 The figure is a schematic diagram of the process of the second embodiment of the present invention. DETAILED DESCRIPTION

[0038] In order to clearly illustrate the technical features of the present solution, the present invention is described in detail below through specific implementation methods and in conjunction with the accompanying drawings. The disclosure below provides many different embodiments or examples for realizing different structures of the present invention. In order to simplify the disclosure of the present invention, the components and settings of specific examples are described below. In addition, the present invention may repeat reference numbers and / or letters in different examples. This repetition is for the purpose of simplification and clarity, and does not itself indicate the relationship between the various embodiments and / or settings discussed. It should be noted that the components illustrated in the accompanying drawings are not necessarily drawn to scale. The present invention omits the description of known components and processing techniques and processes to avoid unnecessary limitations on the present invention.

[0039] Embodiment 1

[0040] like Figure 1 As shown, the present invention provides a photovoltaic grid-connected configuration-free system, which is communicatively connected to a power dispatching main station 1, and includes: a photovoltaic inverter acquisition module 2, an automatic power generation control module 3 and a communication module 4, wherein the photovoltaic inverter acquisition module 2 is used to collect telemetry data and telesignaling data of the photovoltaic inverter 6, convert the collected telemetry data and telesignaling data of the photovoltaic inverter 6 into a unified photovoltaic acquisition protocol, and send the converted telemetry data and telesignaling data of the photovoltaic inverter 6 to the power dispatching main station 1 through the communication module 4; the power dispatching main station 1 is used to receive the converted telemetry data and telesignaling data of the photovoltaic inverter 6, generate a target value for active power generation regulation according to the telemetry data and telesignaling data of the photovoltaic inverter 6, and send the generated active power generation regulation target value to the automatic power generation control module 3 through the communication module 4; the automatic power generation control module 3 is used to configure the output active power of multiple photovoltaic inverters 6, so that the active power change values ​​of all photovoltaic inverters 6 reach the active power generation target value.

[0041] Furthermore, if Figure 2 As shown, a photovoltaic grid-connected configuration-free system provided by the present invention also includes: an encryption module 5, which is respectively connected to the photovoltaic inverter acquisition module 2 and the communication module 4 for communication, and is used to receive and encrypt the telemetry data and telesignaling data of the converted photovoltaic inverter 6 sent by the photovoltaic inverter acquisition module, and send the encrypted telemetry data and telesignaling data of the converted photovoltaic inverter 6 to the power dispatching master station 1 through the communication module 4.

[0042] Specifically, the encryption module 5 can be implemented using a vertical encryption device, which has a built-in national standard power WeChat vertical encryption chip, and the vertical encryption device of the power dispatching master station 1 uses the SM2 encryption algorithm to establish an encrypted tunnel, realize identity two-way authentication, data encryption and access control functions, build a WAPI network, and support the WAPI protocol (Wireless LAN Authentication and Privacy Infrastructure, which is a security protocol for wireless LAN authentication and confidentiality infrastructure, and is also China's mandatory standard for wireless LAN security).

[0043] Among them, Figure 3 As shown, the photovoltaic inverter acquisition module 2 includes several acquisition submodules 21 and several protocol conversion submodules 22. The acquisition submodule 21 (which can be set at the photovoltaic inverter to communicate with the photovoltaic inverter at a short distance, or can be set at a place far away from the photovoltaic inverter to communicate with the photovoltaic inverter at a long distance, and the present invention is not limited here) obtains the model information, telemetry data and telesignal data of each photovoltaic inverter 6, determines the manufacturer information corresponding to the photovoltaic inverter 6 and the data protocol information corresponding to the manufacturer information according to the model information (a corresponding relationship database can be established in advance to store the corresponding relationship between the photovoltaic inverter model information, manufacturer information and photovoltaic inverter protocol information), and calls the corresponding protocol conversion submodule 22 according to the data protocol information of each photovoltaic inverter 6, and converts the protocol of the telemetry data and the telesignal data into a unified photovoltaic acquisition protocol (i.e., the power IEC104 protocol). The telemetry data can include the active power, reactive power, voltage and current of the photovoltaic inverter 6, and the telesignal data can include the switch position and the knife switch position.

[0044] The number of acquisition submodules 21 corresponds to the number of photovoltaic inverters 6 , and the number of protocol conversion submodules 22 corresponds to the number of manufacturers of photovoltaic inverters 6 .

[0045] Specifically, each acquisition submodule 21 creates a standard photovoltaic data acquisition model. The standard photovoltaic data acquisition model in modbus format is as follows:

[0046] Telemetry data:

[0047] #1 Inverter Voltage

[0048] Send: 010300000001crc

[0049] Receive: 010302 data data CRC

[0050] #1 Inverter Current

[0051] Send: 010300010001crc

[0052] Receive: 010302 data data CRC

[0053] #1 Inverter Power

[0054] Send: 010300020001crc

[0055] Receive: 010302 data data CRC

[0056] #1 Inverter daily power generation

[0057] Send: 010300030001crc

[0058] Receive: 010302 data data CRC

[0059] #1 Total power generation of inverter

[0060] Send: 010300040001crc

[0061] Receive: 010302 data data CRC

[0062] #2 Inverter voltage

[0063] Send: 010300050001crc

[0064] Receive: 010302 data data CRC

[0065] #1Inverter voltage current power daily power generation total power generation send: 010300000005crc

[0066] Receive: 01030A (data data) * 5CRC

[0067] Remote signaling data:

[0068] #1 Inverter Status

[0069] Send: 010200000008crc

[0070] Receive: 010201 data CRC low bit at the end, a total of seven bits

[0071] For example, data: 13-->00010011 is 0 0 (limit no) 0 (derating no) 1 (standby yes) 0 (fault shutdown no) 0 (controlled shutdown no) 1 (initial standby yes) 1 (normal operation yes)

[0072] #2 Inverter Status

[0073] Send: 010200010008crc

[0074] Receive: 010201 data CRC low bit at the end, a total of seven bits

[0075] #1 Inverter status #2 Inverter status

[0076] Send: 010200000010crc

[0077] Receive: 010202 data data CRC

[0078] Remote adjustment data:

[0079] Control the ACG percentage of all inverters

[0080] Send: 01060000 percent crc

[0081] Receive: 0106000001CRC / / Set successfully

[0082] Decimal rule: 10000 = 100% 1000 = 10%

[0083] Example: Send control inverter ACG50%

[0084] 010600001388crc

[0085] A unified standard protocol library is created in each protocol conversion submodule 22 (converting different forms or types of modbus protocols into the power IEC104 protocol) to achieve standardized data access for distributed photovoltaic data. Specifically, the photovoltaic inverter protocols (modbus protocols) of different manufacturers are converted into the power IEC104 protocol, that is, each protocol conversion submodule 22 can convert a photovoltaic inverter protocol (modbus protocol) of a certain manufacturer into the power IEC104 protocol. The number of protocol conversion submodules 22 corresponds to the number of manufacturers of photovoltaic inverters 6, that is, the number of protocol conversion submodules 22 corresponds to the number of photovoltaic inverter protocol types.

[0086] like Figure 4As shown, the photovoltaic inverter acquisition module 2 is mainly for different manufacturers of photovoltaic inverter protocols into a unified standard photovoltaic acquisition protocol, for unified interface and dispatch master station module communication. After the photovoltaic inverter acquisition module 2 is initialized, it will start the corresponding client acquisition thread according to the photovoltaic inverter manufacturer that needs to be collected in the configuration file, and traverse the requested voltage, current, power, power generation and other data. After the photovoltaic inverter is connected, create a client acquisition thread, first open the power setting permission, and then regularly traverse the requested voltage, AC current, DC current, active power, reactive power, power factor, daily power generation, total power generation, current power percentage and other data, and store them in a unified format in the data array in the global variable (acquisition submodule 21), and then, the protocol conversion submodule 22 corresponding to the photovoltaic inverter protocol type (corresponding to the photovoltaic inverter manufacturer information) performs protocol conversion, and converts the protocol of telemetry data and telesignaling data into a unified photovoltaic acquisition protocol (electricity IEC104 protocol). When there is a power limit command, the automatic power generation control module 3 executes the command on the photovoltaic inverter, that is, configures the output active power of multiple photovoltaic inverters 6 so that the active power change value of all photovoltaic inverters 6 reaches the active power target value.

[0087] The power dispatching master station 1 is used to receive the converted telemetry data and telesignaling data of the photovoltaic inverter 6, and generate the target value of active power generation control according to the telemetry data and telesignaling data of the photovoltaic inverter 6, which is specifically:

[0088] The power dispatching master station 1 receives the converted telemetry data and telesignaling data of the photovoltaic inverter 6, determines the current output active power of all photovoltaic inverters 6 according to the telemetry data and telesignaling data of the photovoltaic inverter 6, and generates the target value of active power regulation of power generation according to the current active power of all photovoltaic inverters 6. For example, the active power information in the telemetry data of each photovoltaic inverter 6 is summed to determine the current output active power of all photovoltaic inverters 6, and then, according to the preset current active power target value of all photovoltaic inverters 6 (that is, the active power of all photovoltaic inverters after regulation, which can be adjusted regularly or irregularly according to actual conditions), the target value of active power regulation of power generation is determined (the target value of active power regulation of power generation can be the difference between the current output active power of all photovoltaic inverters and the preset current active power target value of all photovoltaic inverters, or the difference between the current output active power of all photovoltaic inverters and the preset current active power target value of all photovoltaic inverters and the current output active power of all photovoltaic inverters).

[0089] Among them, the automatic power generation control module 3 is also communicated with the photovoltaic inverter collection module 1, or can be communicated with the photovoltaic inverter collection module 1 through the communication module 4, or can be directly communicated with the power dispatching main station 1 to obtain the telemetry data and telesignaling data of the converted photovoltaic inverter 6, and determine the current active power of each photovoltaic inverter 6 according to the telemetry data and telesignaling data. According to the active power generation control target value issued by the power dispatching main station and the current active power of each photovoltaic inverter 6, the output active power of multiple photovoltaic inverters 6 is configured so that the active power change value of all photovoltaic inverters 6 reaches the active power generation control target value.

[0090] Among them, according to the active power control target value issued by the power dispatching master station and the current active power of each photovoltaic inverter 6, the output active power of multiple photovoltaic inverters 6 is configured so that the power generation power reaches the active power target value, specifically including:

[0091] A photovoltaic inverter 6 that meets the preset conditions is used as a sample machine, and the currently collected active power output of the sample machine is used as the maximum active power output at the current moment;

[0092] According to the maximum active power output at the current moment and the current active power output of the photovoltaic inverter 6, determine the current increaseable active power output and the current decreaseable active power output of each photovoltaic inverter 6;

[0093] According to the current increaseable active power output and the current decreaseable active power output of the photovoltaic inverter 6, they are sorted from large to small. When the power dispatching master station sends the target value of active power generation regulation, the photovoltaic inverters 6 are regulated one by one according to their sorting until the target value of active power generation regulation is reached.

[0094] Among them, the preset condition can be an AGC module (Automatic Generation Control), that is, an automatic generation control module 3, which adopts a sample machine algorithm strategy (taking a photovoltaic inverter as a sample machine, and the control principle of the sample machine is to generate electricity first and reduce it last), that is, setting the full percentage power output of a photovoltaic inverter 6 with sufficient sunlight (the local average illumination duration is greater than the preset illumination duration threshold, and the local average illumination intensity is greater than the preset illumination intensity threshold) as the sample machine, and the output active power output of the sample machine collected at the current moment is the maximum active power output at the current moment. In this way, the current increaseable active power output (the maximum active power output of the sample machine at the current moment-the current active power output of the photovoltaic inverter) and the current reductionable active power output (the current active power output of the photovoltaic inverter) of each photovoltaic inverter 6 can be calculated.

[0095] When the power dispatching master station sends the target value of active power generation regulation, the photovoltaic inverters 6 are regulated one by one according to their order until the target value of active power generation regulation is reached. Specifically,

[0096] When the power dispatching master station sends the target value for active power generation regulation, the photovoltaic inverters 6 with the highest ranking are preferentially selected to regulate the output active power output, so as to achieve the regulation participation of the minimum number of photovoltaic inverters 6 and reach the target value for active power generation regulation.

[0097] Specifically, the current increaseable active power output is the lower limit of the active power that can be increased by all photovoltaic inverters currently collected. It is usually the minimum power generation that can ensure that the inverter does not shut down or crash. When it is reached, the lock state is turned on and off to 1.

[0098] By analyzing the current power generation of all photovoltaic inverters, when the increase or decrease of power generation demand can be regulated within one, the photovoltaic inverter 6 with the largest current adjustable amount is selected for regulation, and strive to achieve one-time regulation. When the increase or decrease of power generation demand can be regulated within two, the photovoltaic inverter 6 with the largest adjustable amount is adjusted first, and the second largest photovoltaic inverter 6 is selected second, and the regulation is completed twice. When the increase or decrease of power generation demand can be regulated within three photovoltaic inverters 6, the photovoltaic inverter with the largest adjustable amount (currently increaseable active power output or current decreaseable active power output) is adjusted first, and the second largest photovoltaic inverter 6 is selected second, and the third largest photovoltaic inverter 6 is selected third, and the regulation is completed three times, and so on. The output power of the photovoltaic inverter 6 is configured with the least number of photovoltaic inverters participating in the regulation and the least number of adjustments.

[0099] The fastest adjustment speed is to test the shortest time of the collection cycle and the control cycle on-site according to the current response speed of the photovoltaic inverter 6, and strive to achieve the premise that the inverter control is not affected, and the inverter immediately issues the next control command after completing the control during the collection, that is, the time for the automatic power generation control module 3 to send the command to the photovoltaic inverter 6 is greater than the response time of the photovoltaic inverter to be adjusted, and the difference between the time length of the automatic power generation control module 3 to send the command to the photovoltaic inverter 6 and the response time length of the photovoltaic inverter to be adjusted is as small as possible, that is, less than the preset time length threshold.

[0100] The communication module 4 can be a 5G communication module. Through the 5G communication module, the SA independent networking mode is set, and the power 5G power slice private network is connected through the power-specific Internet of Things card, and then connected to the security access area of ​​the power dispatching master station 1, to achieve communication with the power dispatching master station 1 private network, to ensure low latency and high reliability of the channel, high network speed, and stable connection and transmission of data.

[0101] In the technical solution of the present invention, the photovoltaic inverter acquisition module is used to collect telemetry data and telesignaling data of the photovoltaic inverter, convert the collected telemetry data and telesignaling data of the photovoltaic inverter into a unified photovoltaic acquisition protocol, and send the converted telemetry data and telesignaling data of the photovoltaic inverter to the power dispatching main station; the power dispatching main station is used to receive the converted telemetry data and telesignaling data of the photovoltaic inverter, generate a target value for active power generation regulation according to the telemetry data and telesignaling data of the photovoltaic inverter, and send the generated active power generation regulation target value to the automatic power generation control module through the communication module; the automatic power generation control module is used to configure the output active power of multiple photovoltaic inverters so that the active power change values ​​of all photovoltaic inverters reach the active power generation target value, realize the automatic regulation, control and management of each photovoltaic inverter, effectively solve the problem of difficulty and low efficiency in distributed photovoltaic grid-connected configuration caused by the prior art, effectively improve the efficiency of distributed photovoltaic grid-connected configuration, and reduce the difficulty of configuration.

[0102] The system in the technical solution of the present invention also includes: an encryption module, which receives and encrypts the telemetry data and telesignaling data of the converted photovoltaic inverter sent by the photovoltaic inverter acquisition module, and sends the encrypted telemetry data and telesignaling data of the converted photovoltaic inverter to the power dispatching main station through the communication module, thereby improving the reliability and security of communication between the power grid photovoltaic inverter and the power dispatching main station.

[0103] The photovoltaic inverter acquisition module in the technical solution of the present invention includes several acquisition sub-modules and several protocol conversion sub-modules. The acquisition sub-module obtains the model information of each photovoltaic inverter, determines the manufacturer information corresponding to the photovoltaic inverter and the data protocol information corresponding to the manufacturer information according to the model information, calls the corresponding protocol conversion sub-module according to the data protocol information of each photovoltaic inverter, converts the protocol of telemetry data and telesignaling data into a unified photovoltaic acquisition protocol; standardizes the photovoltaic access standards of different manufacturers, realizes the unified access of various photovoltaic inverters, and reduces the difficulty and cost of operation and maintenance.

[0104] In the technical solution of the present invention, the automatic power generation control module obtains the telemetry data and telesignaling data of the converted photovoltaic inverter, determines the current active power of each photovoltaic inverter according to the telemetry data and telesignaling data, and sorts them from large to small according to the current increaseable active power output and the current decreaseable active power output of the photovoltaic inverter. When the power dispatching main station sends the target value of power generation active control, the photovoltaic inverter with the highest order is preferentially traversed to select the photovoltaic inverter with the highest order to adjust the output active power output, so as to achieve the output power target value required by the power dispatching agency with the least number of photovoltaic inverters participating in the adjustment, the least number of adjustments and the fastest adjustment speed, thereby providing strong technical support for realizing the "adjustable and controllable" low-voltage distributed power supply; forming an overall design scheme of photovoltaic inverter grid-connected configuration-free quick application technology, and improving the efficiency of data collection, transmission and calculation of various types of communication terminals.

[0105] Embodiment 2

[0106] like Figure 5 As shown, the technical solution of the present invention also provides a photovoltaic grid-connected configuration-free method, which is implemented based on a photovoltaic grid-connected configuration-free system in embodiment 1, and includes:

[0107] S1, the photovoltaic inverter acquisition module collects the telemetry data and telesignal data of the photovoltaic inverter, converts the collected telemetry data and telesignal data of the photovoltaic inverter into a unified photovoltaic acquisition protocol, and sends the converted telemetry data and telesignal data of the photovoltaic inverter to the power dispatching master station;

[0108] S2, the power dispatching master station is used to receive the converted telemetry data and telesignaling data of the photovoltaic inverter, generate the active power generation control target value according to the telemetry data and telesignaling data of the photovoltaic inverter, and send the generated active power generation control target value to the automatic power generation control module through the communication module;

[0109] S3, the automatic power generation control module is used to configure the output active power output of multiple photovoltaic inverters so that the comprehensive power generation active power output of all photovoltaic inverters reaches the power generation active target value.

[0110] Among them, in step S1, the photovoltaic inverter acquisition module mainly converts the photovoltaic inverter protocols of different manufacturers into a unified standard photovoltaic acquisition protocol for unified interface and communication with the dispatching master station module. After the photovoltaic inverter acquisition module is initialized, it will start the corresponding client acquisition thread according to the photovoltaic inverter manufacturer that needs to be collected in the configuration file, and traverse the requested voltage, current, power, power generation and other data. After the photovoltaic inverter is connected, create a client acquisition thread, first open the power setting permission, and then regularly traverse the requested voltage, AC current, DC current, active power, reactive power, power factor, daily power generation, total power generation, current power percentage and other data, and store them in a unified format in the data array in the global variable (acquisition submodule), and then, the protocol conversion submodule corresponding to the photovoltaic inverter protocol type (corresponding to the photovoltaic inverter manufacturer information) performs protocol conversion, and converts the protocol of telemetry data and telesignaling data into a unified photovoltaic acquisition protocol (electricity IEC104 protocol).

[0111] Among them, in step S2, the power dispatching master station is used to receive the converted telemetry data and telesignaling data of the photovoltaic inverter, and generate the power generation active power regulation target value according to the telemetry data and telesignaling data of the photovoltaic inverter, which is specifically:

[0112] The power dispatching master station receives the converted telemetry data and telesignal data of the photovoltaic inverter, determines the current output active power of all photovoltaic inverters according to the telemetry data and telesignal data of the photovoltaic inverter, and generates the active power control target value of power generation according to the active power of all photovoltaic inverters. For example, the active power information in the telemetry data of each photovoltaic inverter is summed to determine the current output active power of all photovoltaic inverters, and then, according to the preset active power target value of all photovoltaic inverters (that is, the active power of all photovoltaic inverters after regulation, which can be adjusted regularly or irregularly according to actual conditions), the active power control target value of power generation is determined (the active power control target value of power generation can be the difference between the current output active power of all photovoltaic inverters and the preset active power target value of all photovoltaic inverters, or the difference between the current output active power of all photovoltaic inverters and the preset active power target value of all photovoltaic inverters and the current output active power of all photovoltaic inverters).

[0113] Among them, in step S3, the automatic power generation control module is also communicated with the photovoltaic inverter acquisition module through the communication module, and can also be directly communicated with the power dispatching main station to obtain the telemetry data and telesignaling data of the converted photovoltaic inverter, and the current active power of each photovoltaic inverter is determined according to the telemetry data and telesignaling data. According to the power generation active control target value issued by the power dispatching main station and the current active power of each photovoltaic inverter, the output active power of multiple photovoltaic inverters is configured so that the power generation active power change value of all photovoltaic inverters reaches the power generation active control target value.

[0114] Among them, according to the active power control target value issued by the power dispatching master station and the current active power of each photovoltaic inverter, the output active power of multiple inverters is configured so that the power generation power reaches the active power target value. Specifically, it includes:

[0115] A photovoltaic inverter that meets the preset conditions is used as a sample machine, and the active power output of the sample machine currently collected is used as the maximum active power output at the current moment;

[0116] According to the maximum active power output at the current moment and the current active power output of the photovoltaic inverter, the current increaseable active power output and the current decreaseable active power output of each photovoltaic inverter are determined;

[0117] According to the current increaseable active power output and the current decreaseable active power output of the photovoltaic inverters, they are sorted from large to small. When the power dispatching master station sends the target value of active power generation regulation, the photovoltaic inverters are regulated one by one according to the sorting until the target value of active power generation regulation is reached.

[0118] Among them, the preset condition can be an AGC module (Automatic Generation Control), that is, an automatic generation control module, which adopts a sample machine algorithm strategy (taking an inverter as a sample machine, and the control principle of the sample machine is to generate electricity first and reduce it last), that is, setting a photovoltaic inverter with sufficient sunlight (the local average light duration is greater than the preset light duration threshold, and the local average light intensity is greater than the preset light intensity threshold) with full percentage power output as the sample machine, and the output active power output of the sample machine collected at the current moment is the maximum active power output at the current moment. In this way, the current increaseable active power output of each photovoltaic inverter (the maximum active power output of the sample machine at the current moment - the current active power output of the photovoltaic inverter) and the current reductionable active power output (the current active power output of the photovoltaic inverter) can be calculated.

[0119] Among them, when the power dispatching master station sends the target value of active power generation regulation, it regulates each PV inverter one by one according to the order of the PV inverters until the target value of active power generation regulation is reached. Specifically:

[0120] When the power dispatching master station sends the target value for active power generation regulation, the photovoltaic inverters with the highest ranking are preferentially traversed to regulate the output active power output, so as to achieve the regulation participation of the minimum number of photovoltaic inverters and achieve the target value for active power generation regulation.

[0121] Specifically, the current increaseable active power output is the lower limit of the active power that can be increased by all photovoltaic inverters currently collected. It is usually the minimum power generation that can ensure that the inverter does not shut down or crash. When it is reached, the lock state is turned on and off to 1.

[0122] By analyzing the power generation of all photovoltaic inverters currently collected, when the increase or decrease of power generation demand can be regulated within one inverter, the inverter with the largest current adjustable amount is selected for regulation, and strive to achieve one-time regulation. When the increase or decrease of power generation demand can be regulated within two inverters, the inverter with the largest adjustable amount is adjusted first, and the second largest inverter is selected next, so that the regulation is completed twice. When the increase or decrease of power generation demand can be regulated within three inverters, the photovoltaic inverter with the largest adjustable amount (currently increaseable active power output or current decreaseable active power output) is adjusted first, and the second largest photovoltaic inverter is selected next, and the third largest photovoltaic inverter is selected next, so that the regulation is completed three times, and so on. The output power of the photovoltaic inverter is configured with the least number of inverters participating in the regulation and the least number of adjustments.

[0123] The fastest regulation speed is to test the shortest time of the collection cycle and the regulation cycle on-site according to the current response speed of the photovoltaic inverter, and strive to achieve the premise that the inverter sends the next control command immediately after the inverter completes the regulation during collection without affecting the inverter regulation, that is, the time for the automatic power generation control module 3 to send instructions to the photovoltaic inverter is greater than the response time of the photovoltaic inverter to be adjusted, and the difference between the time length of the automatic power generation control module to send instructions to the photovoltaic inverter and the response time length of the photovoltaic inverter to be adjusted is as small as possible, that is, less than the preset time length threshold.

[0124] In the technical solution of the present invention, the photovoltaic inverter acquisition module is used to collect telemetry data and telesignaling data of the photovoltaic inverter, convert the collected telemetry data and telesignaling data of the photovoltaic inverter into a unified photovoltaic acquisition protocol, and send the converted telemetry data and telesignaling data of the photovoltaic inverter to the power dispatching main station; the power dispatching main station is used to receive the converted telemetry data and telesignaling data of the photovoltaic inverter, generate a target value for active power generation regulation according to the telemetry data and telesignaling data of the photovoltaic inverter, and send the generated active power generation regulation target value to the automatic power generation control module through the communication module; the automatic power generation control module is used to configure the output active power of multiple photovoltaic inverters so that the active power change values ​​of all photovoltaic inverters reach the active power generation target value, realize the automatic regulation, control and management of each photovoltaic inverter, effectively solve the problem of difficulty and low efficiency in distributed photovoltaic grid-connected configuration caused by the prior art, effectively improve the efficiency of distributed photovoltaic grid-connected configuration, and reduce the difficulty of configuration.

[0125] The system in the technical solution of the present invention also includes: an encryption module, which receives and encrypts the telemetry data and telesignaling data of the converted photovoltaic inverter sent by the photovoltaic inverter acquisition module, and sends the encrypted telemetry data and telesignaling data of the converted photovoltaic inverter to the power dispatching main station through the communication module, thereby improving the reliability and security of communication between the power grid photovoltaic inverter and the power dispatching main station.

[0126] The photovoltaic inverter acquisition module in the technical solution of the present invention includes several acquisition sub-modules and several protocol conversion sub-modules. The acquisition sub-module obtains the model information of each photovoltaic inverter, determines the manufacturer information corresponding to the photovoltaic inverter and the data protocol information corresponding to the manufacturer information according to the model information, calls the corresponding protocol conversion sub-module according to the data protocol information of each photovoltaic inverter, converts the protocol of telemetry data and telesignaling data into a unified photovoltaic acquisition protocol; standardizes the photovoltaic access standards of different manufacturers, realizes the unified access of various photovoltaic inverters, and reduces the difficulty and cost of operation and maintenance.

[0127] In the technical solution of the present invention, the automatic power generation control module obtains the telemetry data and telesignaling data of the converted photovoltaic inverter, determines the current active power of each photovoltaic inverter according to the telemetry data and telesignaling data, and sorts them from large to small according to the current increaseable active power output and the current decreaseable active power output of the photovoltaic inverter. When the power dispatching main station sends the power generation active power regulation target value, the photovoltaic inverter with the front ranking is preferentially traversed to regulate the output active power output, so as to achieve the output power target value required by the power dispatching agency with the least number of photovoltaic inverters participating in the regulation, the least number of adjustments, and the fastest regulation speed, thereby providing strong technical support for realizing the "adjustable and controllable" low-voltage distributed power supply.

[0128] Although the above describes the specific implementation mode of the present invention in conjunction with the accompanying drawings, it is not intended to limit the scope of protection of the present invention. Those skilled in the art should understand that various modifications or variations that can be made by those skilled in the art on the basis of the technical solution of the present invention without creative work are still within the scope of protection of the present invention.

Claims

1. A photovoltaic grid-connected configuration-free system, characterized in that: The utility model is connected to the communication of the main station of power dispatching, and includes: a photovoltaic inverter acquisition module, an automatic power generation control module and a communication module. The photovoltaic inverter acquisition module is used to collect the telemetry data and telesignaling data of the photovoltaic inverter, convert the collected telemetry data and telesignaling data of the photovoltaic inverter into a unified photovoltaic acquisition protocol, and send the converted telemetry data and telesignaling data of the photovoltaic inverter to the main station of power dispatching through the communication module; the main station of power dispatching is used to receive the converted telemetry data and telesignaling data of the photovoltaic inverter, generate the active power generation control target value according to the telemetry data and telesignaling data of the photovoltaic inverter, and send the generated active power generation control target value to the automatic power generation control module through the communication module; the automatic power generation control module is used to configure the output active power of multiple photovoltaic inverters so that all photovoltaic inverters can be used together. The change value of the active power generation of the PV inverter reaches the target value of active power generation; the automatic power generation control module is also connected to the photovoltaic inverter acquisition module for communication, and obtains the telemetry data and telesignaling data of the converted photovoltaic inverter, and determines the current active power of each photovoltaic inverter according to the telemetry data and telesignaling data, and configures the output active power of multiple photovoltaic inverters according to the active power generation control target value issued by the power dispatching master station and the current active power of each photovoltaic inverter, so that the change value of the active power generation of all photovoltaic inverters reaches the active power generation control target value; wherein, the configuration of the output active power of multiple inverters according to the active power generation control target value issued by the power dispatching master station and the current active power of each photovoltaic inverter so that the power generation power reaches the target value of active power generation specifically includes: A photovoltaic inverter that meets the preset conditions is used as a sample machine, and the currently collected active power output of the sample machine is used as the maximum active power output at the current moment; According to the maximum active power output at the current moment and the current active power output of the photovoltaic inverter, the current increaseable active power output and the current decreaseable active power output of each photovoltaic inverter are determined; According to the current increaseable active power output and the current decreaseable active power output of the photovoltaic inverters, they are sorted from large to small. When the power dispatching master station sends the target value of active power generation regulation, the photovoltaic inverters are regulated one by one according to the sorting until the target value of active power generation regulation is reached; When the power dispatching master station sends the target value of active power generation regulation, the control is performed one by one according to the order of the photovoltaic inverters until the target value of active power generation regulation is reached. Specifically: When the power dispatching master station sends the target value for active power generation regulation, it preferentially traverses and selects the photovoltaic inverters with the highest ranking to regulate the output active power output, so as to achieve the minimum number of photovoltaic inverters participating in the regulation and the minimum number of adjustments, and achieve the target value for active power generation regulation.

2. A photovoltaic grid-connected configuration-free system according to claim 1, characterized in that: include: The encryption module is respectively connected to the photovoltaic inverter acquisition module and the communication module for receiving and encrypting the converted telemetry data and telesignaling data of the photovoltaic inverter sent by the photovoltaic inverter acquisition module, and sending the encrypted converted telemetry data and telesignaling data of the photovoltaic inverter to the power dispatching main station through the communication module.

3. A photovoltaic grid-connected configuration-free system according to claim 1 or 2, characterized in that: The photovoltaic inverter acquisition module includes several acquisition submodules and several protocol conversion submodules. The acquisition submodule obtains the model information, telemetry data and telesignal data of each photovoltaic inverter, determines the manufacturer information corresponding to the photovoltaic inverter and the data protocol information corresponding to the manufacturer information according to the model information, calls the corresponding protocol conversion submodule according to the data protocol information of each photovoltaic inverter, and converts the protocols of the telemetry data and the telesignal data into a unified photovoltaic acquisition protocol.

4. A photovoltaic grid-connected configuration-free system according to claim 3, characterized in that: The number of the acquisition submodules corresponds to the number of photovoltaic inverters, and the number of the protocol conversion submodules corresponds to the number of manufacturers of photovoltaic inverters.

5. The photovoltaic grid-connected configuration-free system according to claim 1 is characterized in that: The telemetry data includes active power, reactive power, voltage and current of the photovoltaic inverter, and the telesignaling data includes switch position and knife switch position.

6. A photovoltaic grid-connected configuration-free system according to claim 1, characterized in that: The power dispatching master station is used to receive the telemetry data and telesignaling data of the photovoltaic inverter after protocol conversion, and generates the power generation active power regulation target value according to the telemetry data and telesignaling data of the photovoltaic inverter: The power dispatching master station receives the converted telemetry data and telesignaling data of the photovoltaic inverter, determines the current output active power of all photovoltaic inverters according to the telemetry data and telesignaling data of the photovoltaic inverter, and generates the active power generation control target value according to the current active power of all photovoltaic inverters.

7. A photovoltaic grid-connected configuration-free method, characterized in that: The photovoltaic grid-connected configuration-free system is implemented based on any one of claims 1 to 6, comprising: The photovoltaic inverter acquisition module collects the telemetry data and telesignal data of the photovoltaic inverter, converts the collected telemetry data and telesignal data of the photovoltaic inverter into a unified photovoltaic acquisition protocol, and sends the converted telemetry data and telesignal data of the photovoltaic inverter to the power dispatching master station through the communication module; The power dispatching master station is used to receive the converted telemetry data and telesignaling data of the photovoltaic inverter, generate the active power generation control target value according to the telemetry data and telesignaling data of the photovoltaic inverter, and send the generated active power generation control target value to the automatic power generation control module through the communication module; The automatic power generation control module is used to configure the output active power output of multiple photovoltaic inverters so that the comprehensive active power output of all photovoltaic inverters reaches the target value of active power generation; the automatic power generation control module is also connected to the photovoltaic inverter acquisition module for communication, and obtains the telemetry data and telesignaling data of the converted photovoltaic inverters, and determines the current active power of each photovoltaic inverter according to the telemetry data and telesignaling data, and configures the output active power of multiple photovoltaic inverters according to the active power generation control target value issued by the power dispatching master station and the current active power of each photovoltaic inverter, so that the active power change value of all photovoltaic inverters reaches the active power generation control target value; wherein, the configuration of the output active power of multiple inverters according to the active power generation control target value issued by the power dispatching master station and the current active power of each photovoltaic inverter so that the power generation power reaches the target value of active power generation specifically includes: A photovoltaic inverter that meets the preset conditions is used as a sample machine, and the currently collected active power output of the sample machine is used as the maximum active power output at the current moment; According to the maximum active power output at the current moment and the current active power output of the photovoltaic inverter, the current increaseable active power output and the current decreaseable active power output of each photovoltaic inverter are determined; According to the current increaseable active power output and the current decreaseable active power output of the photovoltaic inverters, they are sorted from large to small. When the power dispatching master station sends the target value of active power generation regulation, the photovoltaic inverters are regulated one by one according to the sorting until the target value of active power generation regulation is reached; When the power dispatching master station sends the target value of active power generation regulation, the control is performed one by one according to the order of the photovoltaic inverters until the target value of active power generation regulation is reached. Specifically: When the power dispatching master station sends the target value for active power generation regulation, it preferentially traverses and selects the photovoltaic inverters with the highest ranking to regulate the output active power output, so as to achieve the minimum number of photovoltaic inverters participating in the regulation and the minimum number of adjustments, and achieve the target value for active power generation regulation.

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