A centralized monitoring and operation system for distributed photovoltaic power stations and photovoltaic power generation system

Abstract

The present application discloses a centralized monitoring and operation and maintenance system of a distributed photovoltaic power station and a photovoltaic power generation system, and relates to the field of photovoltaic power generation. The centralized monitoring and operation and maintenance system includes multiple management groups; each management group is used to obtain the field data of each collection point of the photovoltaic power station corresponding to it through a wireless network, and send the field data to the monitoring subsystem through the wireless network; the monitoring subsystem is used to determine the photovoltaic power station to be processed among all photovoltaic power stations based on the field data sent by each management group, and generate and send the operation and maintenance work order corresponding to the photovoltaic power station to be processed; the operation and maintenance subsystem is used to process the received operation and maintenance work order, and feedback the processing status of the operation and maintenance work order to the monitoring subsystem. The present application does not need to lay too many communication cables, and at the same time improves the operation and maintenance efficiency, and can meet the needs of operation and maintenance work of large-scale distributed photovoltaic power stations.

Description

Technical Field

[0001] The present application relates to the field of photovoltaic power generation, and in particular to a centralized monitoring and operation and maintenance system for a distributed photovoltaic power station and a photovoltaic power generation system. Background Art

[0002] At present, the SCADA (Supervisory Control And Data Acquisition) system of the traditional photovoltaic power station is implemented based on the local area network and on-site monitoring. The computers, servers, and data processing devices of the SCADA system are generally fixed and concentrated in the control room. The field acquisition devices installed in each photovoltaic power station need to transmit field data to the data processing device in the control room through communication cables, so that the SCADA system can realize centralized monitoring and operation and maintenance based on the field data fed back by each photovoltaic power station. However, for distributed photovoltaic power stations, due to the scattered geographical locations of each photovoltaic power station, the operation and maintenance efficiency is low, and the wiring construction workload of the communication cable is large, and the overall cost of the system is high.

[0003] Therefore, how to provide a solution to the above technical problems is a problem that those skilled in the art need to solve at present. Summary of the invention

[0004] The purpose of this application is to provide a centralized monitoring and operation and maintenance system and a photovoltaic power generation system for a distributed photovoltaic power station, which does not require the laying of too many communication cables, while improving the operation and maintenance efficiency and being able to meet the needs of operation and maintenance of large-scale distributed photovoltaic power stations.

[0005] In order to solve the above technical problems, the present application provides a centralized monitoring and operation and maintenance system for a distributed photovoltaic power station, including:

[0006] Multiple management machine groups; each of the management machine groups is used to obtain field data of each collection point of the photovoltaic power station corresponding to it through a wireless network, and send the field data to the monitoring subsystem through the wireless network;

[0007] The monitoring subsystem is used to determine the photovoltaic power station to be processed among all the photovoltaic power stations based on the field data sent by each of the management machine groups, and generate and send an operation and maintenance work order corresponding to the photovoltaic power station to be processed;

[0008] The operation and maintenance subsystem is used to process the received operation and maintenance work order and feedback the processing status of the operation and maintenance work order to the monitoring subsystem.

[0009] Optionally, the management cluster includes:

[0010] A receiving device, used to obtain field data of each collection point of the photovoltaic power station corresponding thereto through a wireless network;

[0011] A first storage device, used to store the field data of each of the collection points;

[0012] A sending device is used to send the field data stored in the first storage device to the monitoring subsystem through a wireless network according to a first preset period; or, the sending module is used to send the field data of any collection point acquired this time to the monitoring subsystem through a wireless network when the change between the field data of the collection point acquired last time is greater than a first preset threshold.

[0013] Optionally, the sending device is further used to send the field data stored in the first storage device to the monitoring subsystem via a wireless network according to a second preset period; the second preset period is greater than the first preset period.

[0014] Optionally, the monitoring subsystem includes:

[0015] A first processing device, used for acquiring the field data of each of the collection points sent by each of the management machine groups, judging whether the field data of each of the collection points meets the alarm condition corresponding to the collection point, and if so, storing the field data meeting the alarm condition as alarm data in a second storage device;

[0016] A second processing device, used to determine the indicators of the photovoltaic power station corresponding to each management group based on the field data of each collection point sent by each management group, and to judge whether there are abnormal indicators in the indicators of each photovoltaic power station, and if so, store the abnormal indicators in the second storage device;

[0017] The second storage device is used to store the alarm data and / or the abnormality index;

[0018] The third processing device is used to determine the photovoltaic power station to be processed according to the alarm data and / or the abnormal index in the second storage device, and generate and send an operation and maintenance work order corresponding to the photovoltaic power station to be processed.

[0019] Optionally, the process of obtaining the field data of each of the collection points sent by each of the management machine groups, determining whether the field data of each of the collection points meets the alarm condition corresponding to the collection point, and if so, storing the field data meeting the alarm condition as alarm data in the second storage device includes:

[0020] Acquire the field data of each of the collection points sent by each of the management machine groups;

[0021] Determine whether there is abnormal data and / or missing data at each of the collection points;

[0022] If not, the field data of the collection point is determined as valid data;

[0023] If so, determining valid data corresponding to the abnormal data and / or the missing data;

[0024] Performing a marking operation on each of the collection points, the marking operation comprising determining whether the valid data of the collection point meets the alarm condition corresponding to the collection point, and if so, setting the identification position of the collection point to a first preset value, and if not, setting the identification position of the collection point to a second preset value;

[0025] The valid data of the collection point whose identification bit is the first preset value is stored in the second storage device as alarm data.

[0026] Optionally, the process of determining whether there is an abnormal indicator among the indicators of each photovoltaic power station, and if so, storing the abnormal indicator in the second storage device includes:

[0027] Performing dimensionless processing on the same indicators of each photovoltaic power station;

[0028] Determine the index ranking of the same index of each photovoltaic power station after the dimensionless processing, and determine the index corresponding to the ranking of the last n power stations as the abnormal index corresponding to the power station, where n is a positive integer;

[0029] The abnormal indicator and the corresponding power station are stored in the second storage device.

[0030] Optionally, the monitoring subsystem further includes:

[0031] A display device is used to display the indicators of each photovoltaic power station and the operation and maintenance work order.

[0032] Optionally, the operation and maintenance subsystem includes multi-level operation and maintenance stations;

[0033] The operation and maintenance station at each level is used to receive the operation and maintenance work order, determine whether the operation and maintenance work order meets its own processing conditions, and if so, process the operation and maintenance work order and feedback the processing status of the operation and maintenance work order. If not, send the operation and maintenance work order to the operation and maintenance station at the next level.

[0034] Optionally, the process of feeding back the processing status of the operation and maintenance work order includes:

[0035] Determine whether it is a first-level operation and maintenance station;

[0036] If not, feedback the processing status of the operation and maintenance work order to the first-level operation and maintenance station;

[0037] If so, determine whether the processing status of the currently acquired operation and maintenance work order meets the upload conditions. If so, feedback the processing status of the operation and maintenance work order to the monitoring subsystem.

[0038] In order to solve the above technical problems, the present application also provides a photovoltaic power generation system, including a distributed photovoltaic power station and a centralized monitoring and operation and maintenance system of the distributed photovoltaic power station as described in any one of the above.

[0039] The present application provides a centralized monitoring and operation and maintenance system for distributed photovoltaic power stations. For distributed photovoltaic power stations, the management machine group uses a wireless network to obtain the on-site data of the photovoltaic power station, and uploads the on-site data of the photovoltaic power station to the monitoring subsystem through the wireless network, without laying too many communication cables. The monitoring subsystem determines whether there is a photovoltaic power station to be processed based on the acquired on-site data of each photovoltaic power station and issues a corresponding operation and maintenance work order. After the operation and maintenance subsystem receives the operation and maintenance work order, the operation and maintenance personnel process the photovoltaic power station to be processed, and feed back the processing status of the operation and maintenance work order to the monitoring subsystem, thereby improving the operation and maintenance efficiency and meeting the needs of the operation and maintenance of large-scale distributed photovoltaic power stations. The present application also provides a photovoltaic power generation system, which has the same beneficial effects as the centralized monitoring and operation and maintenance system of the above-mentioned distributed photovoltaic power station. BRIEF DESCRIPTION OF THE DRAWINGS

[0040] In order to more clearly illustrate the embodiments of the present application, the following is a brief introduction to the drawings required for use in the embodiments. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0041] Figure 1 A schematic diagram of the structure of a centralized monitoring and operation and maintenance system for a distributed photovoltaic power station provided in this application;

[0042] Figure 2 A schematic diagram of the structure of a monitoring subsystem provided in this application;

[0043] Figure 3 A schematic diagram of an operation and maintenance evaluation index system provided in this application. DETAILED DESCRIPTION

[0044] The core of this application is to provide a centralized monitoring and operation and maintenance system and a photovoltaic power generation system for a distributed photovoltaic power station, which does not require the laying of too many communication cables, while improving the operation and maintenance efficiency and being able to meet the needs of operation and maintenance of large-scale distributed photovoltaic power stations.

[0045] In order to make the purpose, technical solution and advantages of the embodiments of the present application clearer, the technical solution in the embodiments of the present application will be clearly and completely described below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of this application.

[0046] Please refer to Figure 1 , Figure 1 This is a structural diagram of a centralized monitoring and operation and maintenance system for a distributed photovoltaic power station provided in this application, and the centralized monitoring and operation and maintenance system includes:

[0047] A plurality of management machine groups 1; each management machine group 1 is used to obtain field data of each collection point of the photovoltaic power station corresponding thereto through a wireless network, and send the field data to the monitoring subsystem 2 through the wireless network;

[0048] The monitoring subsystem 2 is used to determine the photovoltaic power station to be processed among all photovoltaic power stations based on the field data sent by each management machine group 1, and generate and send an operation and maintenance work order corresponding to the photovoltaic power station to be processed;

[0049] The operation and maintenance subsystem 3 is used to process the received operation and maintenance work orders and feedback the processing status of the operation and maintenance work orders to the monitoring subsystem 2.

[0050] Specifically, the centralized monitoring and operation and maintenance system includes a wireless intelligent communication management machine group subsystem, which includes multiple management machine groups 1. One management machine group 1 corresponds to a distributed photovoltaic power station one by one. Each management machine group 1 communicates with the field equipment of its corresponding distributed photovoltaic power station through a wireless network to obtain field data from various collection points of the photovoltaic power station, such as voltage data and current data of the photovoltaic inverter, telemetry data, power data, etc. It can be understood that some distributed photovoltaic power stations are equipped with on-site monitoring systems, and the management machine group 1 can directly obtain relevant data through the system interface of the on-site monitoring system.

[0051] Each management machine group 1 uploads the acquired field data of the photovoltaic power station to the monitoring subsystem 2. Specifically, the acquired field data can be collected to the monitoring subsystem 2 through the Internet security channel. It can be understood that the Internet security channel refers to the Internet security encryption through some encryption mechanisms (such as VPN) to form a security channel. Each management machine group 1 has LTE-4G wireless, serial port, Ethernet, LORA wireless, 4~20mA signal acquisition methods to facilitate access to various field data of the photovoltaic power station. Furthermore, the management machine group 1 also has functions such as intelligent software program, real-time clock, watchdog abnormal reset, remote debugging, etc. Among them, the intelligent software program refers to a small embedded system with software functions such as communication, warehousing, and interface. The remote debugging function includes remote restart, remote parameter configuration, remote update program, and remote debugging protocol program. The remote parameter configuration method of the management machine group 1 supports the master station C / S configuration program method, PC-web page method, and mobile APP.

[0052] Specifically, the monitoring subsystem 2 analyzes whether there is a photovoltaic power station to be processed based on the on-site data of the photovoltaic power stations uploaded by each management group 1. If there is a photovoltaic power station to be processed, an operation and maintenance work order corresponding to the photovoltaic power station to be processed is generated, and the operation and maintenance work order is sent to the operation and maintenance subsystem 3. The operation and maintenance subsystem 3 prompts the corresponding operation and maintenance personnel to process the photovoltaic power station to be processed, and uploads the operation and maintenance status to the monitoring subsystem 2, so that the monitoring subsystem 2 can understand the operation and maintenance status of the photovoltaic power station to be processed.

[0053] It can be seen that in this implementation, for distributed photovoltaic power stations, the management group 1 uses a wireless network to obtain the on-site data of the photovoltaic power station, and uploads the on-site data of the photovoltaic power station to the monitoring subsystem 2 through the wireless network. There is no need to lay too many communication cables. The monitoring subsystem 2 determines whether there is a photovoltaic power station to be processed based on the acquired on-site data of each photovoltaic power station and issues a corresponding operation and maintenance work order. After the operation and maintenance subsystem 3 receives the operation and maintenance work order, the operation and maintenance personnel will process the photovoltaic power station to be processed, and feed back the processing status of the operation and maintenance work order to the monitoring subsystem 2, which improves the operation and maintenance efficiency and can meet the needs of operation and maintenance of large-scale distributed photovoltaic power stations.

[0054] Based on the above embodiments:

[0055] As an optional embodiment, the management cluster 1 includes:

[0056] A receiving device, used to obtain field data of each collection point of the photovoltaic power station corresponding thereto through a wireless network;

[0057] A first storage device is used to store the field data of each collection point;

[0058] The sending device is used to send the field data stored in the first storage device to the monitoring subsystem 2 through the wireless network according to the first preset period; or the sending module is used to send the field data of any collection point obtained this time to the monitoring subsystem 2 through the wireless network when the change amount between the field data of any collection point obtained last time is greater than the first preset threshold. As an optional embodiment, the sending device is also used to send the field data stored in the first storage device to the monitoring subsystem 2 through the wireless network according to the second preset period; the second preset period is greater than the first preset period.

[0059] Specifically, each management machine group 1 includes a receiving device connected to the field equipment and system communication interface through a wireless network, which is used to obtain the field data of each collection point of the photovoltaic power station. Each management machine group 1 also includes a first storage device, which is used to store the field data of each collection point received by the receiving device. Each management machine group 1 also includes a sending device, which is used to send the field data stored in the first storage device to the monitoring subsystem 2 according to preset rules.

[0060] Among them, when the sending device sends the field data of the photovoltaic power station to the monitoring subsystem 2, it can choose a combination of change sending and periodic sending, that is, the field data stored in the first storage device can be sent to the monitoring subsystem 2 according to the first preset period, or when it is determined that the field data of a certain collection point has a large change compared with the field data of the collection point obtained last time, such as when the change exceeds the first preset value, the latest field data of the collection point is sent to the monitoring subsystem 2. The preset value corresponding to each collection point for triggering the change sending can be set according to actual needs. For example, the preset value corresponding to the collection point A is a, and the preset value corresponding to the collection point B is b. That is to say, if the change amount of the field data of the currently obtained collection point A and the field data of the collection point A obtained last time is greater than a, the latest field data of the collection point A is actively uploaded to the monitoring subsystem 2, and if the change amount of the field data of the currently obtained collection point B and the field data of the collection point B obtained last time is greater than b, the latest field data of the collection point B is actively uploaded to the monitoring subsystem 2.

[0061] Furthermore, the present application also sends the field data of the collection point to the monitoring subsystem 2 through the wireless network according to a second preset period that is greater than the first preset period, wherein the time interval and preset value of the periodic transmission can be remotely configured.

[0062] Please refer to Figure 2 , Figure 2 This is a schematic diagram of the structure of a monitoring subsystem 2 provided in this application, and the monitoring subsystem 2 includes:

[0063] The first processing device 21 is used to obtain the field data of each collection point sent by each management machine group 1, and determine whether the field data of each collection point meets the alarm condition corresponding to the collection point. If so, the field data meeting the alarm condition is stored as alarm data in the second storage device 23;

[0064] The second processing device 22 is used to determine the indicators of the photovoltaic power station corresponding to the management group 1 based on the field data of each collection point sent by each management group 1, and determine whether there are abnormal indicators in the indicators of each photovoltaic power station. If so, store the abnormal indicators in the second storage device 23;

[0065] A second storage device 23, used to store alarm data and / or abnormality indicators;

[0066] The third processing device 24 is used to determine the photovoltaic power station to be processed according to the alarm data and / or abnormal indicators in the second storage device 23, and generate and send an operation and maintenance work order corresponding to the photovoltaic power station to be processed.

[0067] As an optional embodiment, the monitoring subsystem 2 further includes:

[0068] The display device 25 is used to display the indicators and operation and maintenance work orders of each photovoltaic power station.

[0069] Specifically, the monitoring subsystem 2 includes a front data interface, a data exchange interface, a first processing device 21 , a second processing device 22 , a second storage device 23 and a display device 25 .

[0070] Among them, the front-end data interface adopts flexible and horizontally scalable cluster front-end technology, with the ability to expand access to massive data. The monitoring subsystem 2 adopts a cloud deployment method. When the number of access nodes increases to a certain extent, the front-end server nodes are expanded and distributed deployment is carried out, so that the system completes the access of new nodes without affecting the performance of the original access nodes. Specifically, cluster front-end technology is relative to single-point front-end machine deployment. Cluster refers to deploying multiple front-end machines according to the size of the data volume. According to the front-end user operation requirements, the front-end machine that meets the preset conditions is obtained from the front-end machine routing table, and the operation requirements are sent to the corresponding front-end machine. The front-end will then receive the return requirement results of the front-end machine, which can solve the problem of overload of a single front-end machine when the data volume is large.

[0071] The data exchange interface can provide basic data for the application functions of the system, which can be used by advanced applications of distributed photovoltaics (such as the active operation and maintenance evaluation index system subsystem), and can access the analysis data of advanced applications for data storage and display, and can synchronize the data of the corresponding post to the multi-layer operation and maintenance post subsystem through an intelligent distributed mechanism for display and analysis by the operation and maintenance post. It is understandable that the function of the active operation and maintenance evaluation index system subsystem can be realized by the second processing device 22.

[0072] As an optional embodiment, the process of obtaining the field data of each collection point sent by each management machine group 1, determining whether the field data of each collection point meets the alarm condition corresponding to the collection point, and if so, storing the field data meeting the alarm condition as alarm data in the second storage device 23 includes:

[0073] Obtaining the field data of each collection point sent by each management cluster 1;

[0074] Determine whether there are abnormal data and / or missing data at each collection point;

[0075] If not, the field data at the collection point is determined as valid data;

[0076] If so, determine the valid data corresponding to the abnormal data and / or missing data;

[0077] Performing a marking operation on each collection point, the marking operation includes determining whether the valid data of the collection point meets the alarm condition corresponding to the collection point, if so, setting the identification position of the collection point to a first preset value, if not, setting the identification position of the collection point to a second preset value;

[0078] The valid data of the collection point whose identification bit is the first preset value is stored in the second storage device 23 as alarm data.

[0079] Specifically, the first processing device 21 is specifically used to perform data cleaning, data analysis, alarm judgment, state processing and other operations on the basic data collected in real time by the distributed photovoltaic power station. Taking a management cluster 1 as an example, the data processing process is explained. First, the field data sent by the management cluster 1 is cleaned, and it is determined whether there is abnormal data or missing data that is too large or too small in the field data of a certain collection point sent. If there is abnormal data, the abnormal data is filtered out. Next, the field data of the collection point is analyzed, that is, valid data is calculated based on the field data before and after the abnormal data / missing data, or the field data within a period of time, and the abnormal data is replaced with valid data or the missing data is supplemented. For non-abnormal data, it can be determined as valid data. Next, determine whether the collection point meets the alarm condition based on the valid data of each collection point, such as determining whether the valid data is greater than a certain alarm preset value or less than a certain alarm preset value, and set the mark position corresponding to the collection point that meets the alarm condition to the first preset value, such as 1, and set the mark position of the collection point that does not meet the alarm condition to the second preset value, such as 0. It can be understood that the data corresponding to the collection point set to 1 is the alarm data, and the alarm data is stored in the second storage device 23.

[0080] Considering that the management machine group 1 uploads the field data of each collection point of the photovoltaic power station, which can also be understood as directly measured data, and for the receiving party, the monitoring subsystem 2, it can only obtain the field data of collection point 1, the field data of collection point 2, and the field data of collection point 3. Therefore, it is also necessary to associate the field data of each collection point, such as associating the field data of collection point 1 with the power consumption of the station. Furthermore, considering that some indicators of the photovoltaic power station also need to be further calculated from the collected field data, for example, it is necessary to accumulate the field data, or multiply the field data by the correlation coefficient and other calculation operations, the data after the above processing is stored in the second storage device 23, and the above collection point association operation and the recalculation operation of the field data can be implemented by a new processing device, or can be implemented by the first processing device 21, and this application does not make specific limitations here.

[0081] Furthermore, the field data corresponding to each photovoltaic power station and the statistical data obtained by further calculating the field data are sent to the second processing device 22, and the second processing device 22 is used to calculate and analyze the indicators of each photovoltaic power station.

[0082] Specifically, the hierarchical evaluation index system was established by analyzing the energy characteristics, key equipment and energy monitoring scope of distributed photovoltaic power stations using the hierarchical analysis method. Figure 3 The 7 major categories and 24 minor categories of the hierarchical evaluation index system shown are divided into two levels, primary indicators and secondary indicators;

[0083] Among them, the first-level indicators include 7 categories, including light resource indicators, clean power indicators, energy efficiency indicators, energy consumption indicators, operation indicators, economic indicators, and energy-saving indicators. The second-level indicators include 24 subcategories, among which light resource indicators include sunshine duration and solar irradiance; clean power indicators include power generation, online power, inverter power generation, and maximum output; energy efficiency indicators include equivalent utilization hours of power stations, equivalent utilization hours of inverters, system energy efficiency, inverter conversion efficiency, and array conversion efficiency; energy consumption indicators include station power consumption, station power consumption rate, comprehensive station power consumption, comprehensive station power consumption rate, and inverter power loss; operation indicators include the number of days the entire station is shut down, the entire station power generation time, and the component IV curve; economic indicators include today's income, cumulative income, and return on investment; energy-saving indicators include CO2 emission reduction and cumulative standard coal savings;

[0084] Specifically, in the calculation and display of multi-dimensional indicators, the multiple dimensions include spatial dimension and time dimension. The spatial dimension includes different cities, different counties, different power stations, different inverter devices, array devices and component devices; the time dimension includes minutes, hours, days, months and years; the display can be realized through the display device 25 of the monitoring subsystem 2, and the display form includes the horizontal comparison of a certain indicator of different devices of the same type of spatial dimension at the corresponding time, and the ranking of a single indicator of the same type of equipment at the corresponding time can be directly observed; the display form includes the horizontal and vertical comparison of a certain indicator of different devices of the same type of spatial dimension at the corresponding time period, and the indicator change trend of each moment in the corresponding time period of the same type of equipment can be directly observed; the display form also includes the list display of the second-level indicators under the first-level indicators of the same type of equipment, and the comparative display of different indicators of the same type of equipment can be directly observed; for branded equipment, brand screening display can also be performed, and the indicator comparison of equipment of the same brand can be directly observed.

[0085] The process of the second processing device 22 judging whether there are abnormal indicators in the various indicators of each photovoltaic power station includes dimensionless processing of the same indicators of each photovoltaic power station; determining the indicator ranking of the same indicators of each photovoltaic power station after dimensionless processing, and determining the indicators corresponding to the rankings of the last n power stations as the abnormal indicators corresponding to the power station; and storing the abnormal indicators and the corresponding power stations in the second storage device 23.

[0086] Specifically, the indicators of each photovoltaic power station are dimensionally processed according to the calculated values ​​of the indicators of different dimensions, and then a comparative analysis is performed to obtain the indicator rankings of different types of equipment, so as to find out the equipment and power stations with lower rankings. For example, assuming that there are 5 photovoltaic power stations, respectively recorded as A, B, C, D, and E, the inverter conversion efficiency n of the 5 photovoltaic power stations is first dimensionally processed, and then the calculated values ​​of the dimensionlessly processed indicators are ranked, and the order from large to small is nC>nB>nE>nA>nD, then the abnormal indicators are nA and nD, which means that it can be determined that the inverter conversion efficiency of photovoltaic power station A and photovoltaic power station D is low and there is an abnormality, which is stored in the second storage device 23, so that it can be used as an operation and maintenance standard for active operation and maintenance in the future, and the equipment operation and maintenance tasks are distributed to the operation and maintenance station.

[0087] Specifically, the second storage device 23 includes three databases, namely a real-time database (RTDB), a time series database (TSDB), and a relational data management system (RDEMS). The data stored in the real-time database include data collected on-site and valid data after real-time calculation and processing; the data stored in the time series database can be configured for collection point association, and only the configured real-time data is stored; the data stored in the relational data management system include alarm data, statistical data, metering data, and application analysis data. The application analysis data here includes various types of data obtained by the second processing device 22, such as indicators, abnormal indicators, and display data.

[0088] The third processing device 24 is used to perform offline calculations on various types of data stored in the second storage device 23. The offline calculation includes front-end Web display and work order distribution after data analysis and processing of various types of data stored in the database. The front-end Web display is realized through a display device, including KPI indicator display at all levels of the photovoltaic power station, report display, etc. It can be understood that the photovoltaic power station with abnormal indicators is the photovoltaic power station to be processed, and the photovoltaic power station with alarm data is the photovoltaic power station to be processed. The corresponding operation and maintenance work order is distributed based on the photovoltaic power station to be processed. The operation and maintenance work order may include the location information of the photovoltaic power station to be processed and related data (alarm data and / or abnormal indicators) so that the subsequent operation and maintenance subsystem 3 can be processed.

[0089] As an optional embodiment, the operation and maintenance subsystem 3 includes multi-level operation and maintenance stations;

[0090] Each level of operation and maintenance station is used to receive operation and maintenance work orders, determine whether the operation and maintenance work orders meet its own processing conditions, if so, process the operation and maintenance work orders, and feedback the processing status of the operation and maintenance work orders. If not, the operation and maintenance work orders are sent to the next level of operation and maintenance station.

[0091] As an optional embodiment, the process of feeding back the processing status of the operation and maintenance work order includes:

[0092] Determine whether it is a first-level operation and maintenance station;

[0093] If not, feedback the processing status of the operation and maintenance work order to the first-level operation and maintenance station;

[0094] If so, determine whether the processing status of the currently acquired operation and maintenance work order meets the upload conditions. If so, feedback the processing status of the operation and maintenance work order to the monitoring subsystem 2.

[0095] Specifically, the operation and maintenance subsystem 3 in the present application includes a multi-level operation and maintenance station, which can be divided into multiple levels according to the scale of the distributed photovoltaic power station connected. The first level is the municipal operation and maintenance station, the second level is the county operation and maintenance station, and the third level is the station operation and maintenance station. The operation and maintenance work order is distributed by the monitoring subsystem 2, and then processed and decomposed by the operation and maintenance stations at all levels and distributed to the lower levels. The lower-level operation and maintenance station will feedback the completion of the work order to the upper-level station, and then the first-level operation and maintenance station will count the completion of the work order and synchronize it to the monitoring subsystem 2. The above-mentioned upload condition can be that the number of processing statuses of the obtained operation and maintenance work orders is the same as the number of issued operation and maintenance work orders. For example, the first-level operation and maintenance station receives 3 operation and maintenance work orders. After the first-level operation and maintenance station issues 3 operation and maintenance work orders, it waits to obtain the processing status of the 3 operation and maintenance work orders before feeding back to the monitoring subsystem 2.

[0096] Specifically, each level of operation and maintenance station includes power station archives, equipment ledgers, spare parts, and operation and maintenance management modules. Among them, power station archives refer to the unified management of subordinate photovoltaic power stations, support the review of the capacity, address, contact person, contact number and grid-connected time of each power station, and support the review and comparison of indicator data of subordinate power stations; equipment ledger refers to the combination of screening and query based on organizational structure, equipment commissioning time, equipment name, equipment model, equipment type, equipment status, maintenance person in charge, plant station, supplier and equipment level. Analysis prompts the number of equipment that needs maintenance and details of the equipment to be maintained in the current power station; spare parts refer to the combination of query based on equipment code, name, description type, and warehouse. Provide warehousing and outbound operations; provide historical records of all warehousing and outbound operations; operation and maintenance management includes knowledge base establishment, active operation and maintenance task decomposition, operation and maintenance file management, and operation and maintenance record management. Decompose the issued operation and maintenance tasks through the knowledge base associated with operation and maintenance, and after the operation and maintenance is issued, it is released through the operation and maintenance tasks, and after the release, the operation and maintenance process is closed according to the work order. The completion status of work order tasks is tracked and counted. After the operation and maintenance work order is closed, the difference in system indicators before and after operation and maintenance is compared, which is used as the evaluation standard for the operation and maintenance situation.

[0097] In summary, the wireless intelligent communication management machine group of the present application adopts a safe, reliable and traffic-saving wireless data acquisition technology, which can reduce the workload of installation and debugging, and is low-cost. It can be flexibly applied to the automated communication architecture and supporting network access devices of distributed photovoltaic power stations of various sizes; the use of layered operation and maintenance stations can facilitate and flexibly carry out rapid operation and maintenance positioning of power stations at different levels and track the closed loop of work order tasks; and when the power station is expanded, it only needs to increase the number of configurations of the operation and maintenance stations, which can facilitate the expansion without affecting the normal operation and maintenance of the overall system. The use of an active operation and maintenance evaluation index system can intuitively display the indicators of power stations at different levels, different equipment, and different dimensions, as well as the systematic and intuitive display of the operation and maintenance effects. Compared with the passive operation and maintenance of conventional operation and maintenance, the biggest advantage is that the comparison of indicators of different dimensions can actively discover operation problems, thereby generating operation and maintenance tasks, so that the operation and maintenance are linked with the operation status, which is both intuitive and can effectively save operation and maintenance manpower and material resources.

[0098] On the other hand, the present application also provides a photovoltaic power generation system, including a distributed photovoltaic power station and a centralized monitoring and operation and maintenance system of the distributed photovoltaic power station as described in any one of the embodiments above.

[0099] For an introduction to a photovoltaic power generation system provided in the present application, please refer to the above-mentioned embodiments, and the present application will not go into details here.

[0100] The photovoltaic power generation system provided in the present application has the same beneficial effects as the centralized monitoring and operation and maintenance system of the above-mentioned distributed photovoltaic power station.

[0101] It should also be noted that, in this specification, relational terms such as first and second, etc. are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "comprises", "comprising" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device. In the absence of further restrictions, an element defined by the statement "comprising a ..." does not exclude the presence of other identical elements in the process, method, article or device including the element.

[0102] The above description of the disclosed embodiments enables those skilled in the art to implement or use the present application. Various modifications to these embodiments will be apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the present application. Therefore, the present application will not be limited to the embodiments shown herein, but will conform to the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A centralized monitoring and operation and maintenance system for a distributed photovoltaic power station, characterized in that: include: A plurality of management machine groups, wherein the plurality of management machine groups are arranged in a one-to-one correspondence in a plurality of photovoltaic power stations; each of the management machine groups is used to obtain field data of each collection point of the photovoltaic power station corresponding thereto through a wireless network, and send the field data to a monitoring subsystem through the wireless network; The monitoring subsystem is used to determine the photovoltaic power station to be processed among all the photovoltaic power stations based on the field data sent by each of the management machine groups, and generate and send an operation and maintenance work order corresponding to the photovoltaic power station to be processed; The operation and maintenance subsystem is used to process the received operation and maintenance work order and feedback the processing status of the operation and maintenance work order to the monitoring subsystem; The management cluster includes: A receiving device, used to obtain field data of each collection point of the photovoltaic power station corresponding thereto through a wireless network; A first storage device, used to store the field data of each of the collection points; A sending device, used to send the field data stored in the first storage device to the monitoring subsystem through a wireless network according to a first preset period; or, the sending device is used to send the field data of any collection point acquired this time to the monitoring subsystem through a wireless network when the change amount between the field data of any collection point acquired last time is greater than a first preset threshold value; The monitoring subsystem includes: A first processing device is used to obtain the field data of each of the collection points sent by each of the management machine groups, determine whether each of the collection points has abnormal data and / or missing data, and if not, determine the field data of the collection point as valid data. If so, determine the valid data corresponding to the abnormal data and / or the missing data, and perform a marking operation on each of the collection points, wherein the marking operation includes determining whether the valid data of the collection point meets the alarm condition corresponding to the collection point, and if so, set the identification position of the collection point to a first preset value, and if not, set the identification position of the collection point to a second preset value, and store the valid data of the collection point whose identification position is the first preset value as alarm data in a second storage device; A second processing device is used to determine various indicators of the photovoltaic power stations corresponding to the management machine group one by one based on the field data of each of the collection points sent by each of the management machine groups, and perform dimensionless processing on the same indicators of each of the photovoltaic power stations, determine the indicator ranking of the same indicators of each of the photovoltaic power stations after the dimensionless processing, determine the indicators corresponding to the rankings of the last n power stations as the abnormal indicators corresponding to the power stations, and store the abnormal indicators together with the corresponding power stations in the second storage device, where n is a positive integer; The second storage device is used to store the alarm data and / or the abnormality index; The third processing device is used to determine the photovoltaic power station to be processed according to the alarm data and / or the abnormal index in the second storage device, and generate and send an operation and maintenance work order corresponding to the photovoltaic power station to be processed.

2. The centralized monitoring and operation and maintenance system for distributed photovoltaic power stations according to claim 1 is characterized in that: The sending device is further used to send the field data stored in the first storage device to the monitoring subsystem via a wireless network according to a second preset period; the second preset period is greater than the first preset period.

3. The centralized monitoring and operation and maintenance system for distributed photovoltaic power stations according to claim 1 is characterized in that: The monitoring subsystem also includes: A display device is used to display the indicators of each photovoltaic power station and the operation and maintenance work order.

4. The centralized monitoring and operation and maintenance system for a distributed photovoltaic power station according to any one of claims 1 to 3, characterized in that: The operation and maintenance subsystem includes multi-level operation and maintenance stations; The operation and maintenance station at each level is used to receive the operation and maintenance work order, determine whether the operation and maintenance work order meets its own processing conditions, and if so, process the operation and maintenance work order and feedback the processing status of the operation and maintenance work order. If not, send the operation and maintenance work order to the operation and maintenance station at the next level.

5. The centralized monitoring and operation and maintenance system for distributed photovoltaic power stations according to claim 4 is characterized in that: The process of feeding back the processing status of the operation and maintenance work order includes: Determine whether it is a first-level operation and maintenance station; If not, feedback the processing status of the operation and maintenance work order to the first-level operation and maintenance station; If so, determine whether the processing status of the currently acquired operation and maintenance work order meets the upload conditions. If so, feedback the processing status of the operation and maintenance work order to the monitoring subsystem.

6. A photovoltaic power generation system, characterized in that: It comprises a distributed photovoltaic power station and a centralized monitoring and operation and maintenance system of the distributed photovoltaic power station as described in any one of claims 1 to 5.

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