KR102323391B1 - Device for monitoring solar energy power plant and monitoring method using thereof - Google Patents

Abstract

The present invention relates to a device for monitoring a solar power plant and a monitoring method using the same. The monitoring method comprises the steps of: monitoring wired communication between a monitoring target device and an energy management system (EMS); checking whether a communications state is abnormal based on monitoring results; when a communication state abnormality is confirmed, transmitting a first information request related to the communications state abnormality to at least one of the monitoring target device and the energy management system; receiving first information response corresponding to the first information request from at least one of the monitoring target device and the energy management device; and transmitting at least part of the first information response to a management server through wireless communications. In accordance with the present invention, it is possible to double monitor the occurrence of communications errors between each equipment in the solar power plant, and the data collection method and monitoring system in the EMS can be improved.

Description

A device for monitoring a solar power plant and a monitoring method using the same

An embodiment of the present specification relates to an apparatus and a monitoring method for monitoring the operation of each equipment of a solar power plant, in particular, communication between the equipment in the power plant and an energy management device or a remote terminal unit that manages the operation of the equipment It relates to an apparatus and method for monitoring, checking whether a communication state is abnormal, and responding to an abnormal state.

In general, a solar energy generation system is a system that utilizes new and renewable energy such as photovoltaic (PV) and energy storage system (ESS). It is an eco-friendly energy that can produce electricity using light and solar power generation facilities.

The solar energy generation system is designed together with various facilities according to the purpose of use of solar energy, such as grid-connected power plants and self-supporting grids. .

This solar energy generation system controls the charging and discharging of solar energy through EMS. In general, the surplus power after ESS charging is transmitted to the KEPCO grid power, and when the amount of power generated by the PV module is insufficient, power is supplied from the KEPCO grid power source. ESS is charged with the supply.

However, when a malfunction occurs in equipment in a power plant due to a communication failure, etc., there may be a case where the EMS determines the amount of power generation or charge/discharge based on the measured value in each module, even though the measured value is not in real time. In this case, power may be excessively supplied from the KEPCO grid power source, resulting in overcharging of the ESS and unnecessary costs. In addition, there may be a situation in which ESS charging is impossible due to insufficient power generation, which may cause problems in the operation of the power plant.

An object of the present invention is to provide a monitoring device and a monitoring method using the same for checking and managing communication status abnormality by monitoring communication between equipment and EMS in a power plant in order to solve the above problems.

A monitoring method according to an embodiment of the present specification for achieving the above object includes: monitoring wired communication between a monitoring target device and an energy management device; checking whether the communication state is abnormal based on the monitoring result; transmitting a first information request related to the communication state abnormality to at least one of the monitoring target device and the energy management device when the communication state abnormality is identified; receiving a first information response corresponding to the first information request from at least one of a monitored device and an energy management device; and transmitting at least a part of the first information response to the management server through wireless communication.

In addition, the monitoring device according to an embodiment of the present specification for achieving the above object monitors the wired communication between the monitoring target device and the energy management device, checks whether the communication state is abnormal based on the monitoring result, and the communication state When an abnormality is confirmed, a first information request related to the communication state abnormality is transmitted to at least one of the monitoring target device and the energy management device, and a first information request corresponding to the first information request from at least one of the monitoring target device and the energy management device is transmitted. The information response may be received, and at least a portion of the first information response may be transmitted to the management server through wireless communication.

Through the monitoring method and monitoring device for monitoring a solar energy power plant according to an embodiment of the present specification, an abnormal situation occurs in each equipment in a solar energy power plant, or a communication error between each equipment in the power plant occurs double can be monitored, and the data collection method and monitoring system in EMS can be improved. In addition, according to an embodiment of the present specification, it is possible to prevent unnecessary costs due to overcharging or impossible charging of the ESS and oversupply of power from the KEPCO grid power source.

1 is a configuration diagram schematically illustrating a solar power generation system.
2 is a configuration diagram schematically illustrating a solar power generation system according to an embodiment of the present invention.
3 is a block diagram illustrating a photovoltaic power generation system having a device for monitoring a photovoltaic power plant according to an embodiment of the present invention.
4 is a flowchart illustrating a method of monitoring a solar power plant according to an embodiment of the present invention.
5 is a block diagram schematically illustrating a step of storing a first information response in a database in an energy management device according to an embodiment of the present invention.
6 is a schematic configuration diagram of an RTU of a solar power plant according to an embodiment of the present invention.
7 is a block diagram illustrating a monitoring method using an apparatus for monitoring a solar energy power plant according to an embodiment of the present invention.

Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings.

In describing the embodiments, descriptions of technical contents that are well known in the technical field to which the present invention pertains and are not directly related to the present invention will be omitted. This is to more clearly convey the gist of the present invention without obscuring the gist of the present invention by omitting unnecessary description.

For the same reason, some components are exaggerated, omitted, or schematically illustrated in the accompanying drawings. In addition, the size of each component does not fully reflect the actual size. In each figure, the same or corresponding elements are assigned the same reference numerals.

Advantages and features of the present invention, and a method for achieving them will become apparent with reference to the embodiments described below in detail in conjunction with the accompanying drawings. However, the present invention is not limited to the embodiments disclosed below, but may be implemented in various different forms, and only these embodiments allow the disclosure of the present invention to be complete, and common knowledge in the art to which the present invention pertains. It is provided to fully inform the possessor of the scope of the invention, and the present invention is only defined by the scope of the claims. Like reference numerals refer to like elements throughout.

At this time, it will be understood that each block of the flowchart diagrams and combinations of the flowchart diagrams may be performed by computer program instructions. These computer program instructions may be embodied in a processor of a general purpose computer, special purpose computer, or other programmable data processing equipment, such that the instructions performed by the processor of the computer or other programmable data processing equipment are not described in the flowchart block(s). It creates a means to perform functions. These computer program instructions may also be stored in a computer-usable or computer-readable memory that may direct a computer or other programmable data processing equipment to implement a function in a particular manner, and thus the computer-usable or computer-readable memory. It is also possible that the instructions stored in the flow chart block(s) produce an article of manufacture containing instruction means for performing the function described in the flowchart block(s). The computer program instructions may also be mounted on a computer or other programmable data processing equipment, such that a series of operational steps are performed on the computer or other programmable data processing equipment to create a computer-executed process to create a computer or other programmable data processing equipment. It is also possible that instructions for performing the processing equipment provide steps for performing the functions described in the flowchart block(s).

Additionally, each block may represent a module, segment, or portion of code that includes one or more executable instructions for executing specified logical function(s). It should also be noted that in some alternative implementations it is also possible for the functions recited in blocks to occur out of order. For example, two blocks shown one after another may in fact be performed substantially simultaneously, or it is possible that the blocks are sometimes performed in the reverse order according to the corresponding function.

At this time, the term '~ unit' used in this embodiment means software or hardware components such as FPGA or ASIC, and '~ unit' performs certain roles. However, '-part' is not limited to software or hardware. The '~ unit' may be configured to reside on an addressable storage medium or may be configured to replay one or more processors. Thus, as an example, '~' denotes components such as software components, object-oriented software components, class components, and task components, and processes, functions, properties, and procedures. , subroutines, segments of program code, drivers, firmware, microcode, circuitry, data, databases, data structures, tables, arrays, and variables. The functions provided in the components and '~ units' may be combined into a smaller number of components and '~ units' or further separated into additional components and '~ units'. In addition, components and '~ units' may be implemented to play one or more CPUs in a device or secure multimedia card.

1 is a configuration diagram schematically illustrating a solar power generation system.

Referring to FIG. 1 , the photovoltaic power generation system receives information related to operations of a plurality of photovoltaic power plants 100-1 and 100-2 and the photovoltaic power plants 100-1 and 100-2, and manages them. Management server 10 for, and a commercial power grid ( 20) may be included.

According to an embodiment, the photovoltaic power plant 100-1 includes a photovoltaic power generation unit (PV; PhotoVoltaics, 110), an energy storage device (ESS; Energy Storage System, 120), an energy management system (EMS; Energy Management System, 130) and a remote terminal unit (RTU; Remote Terminal Unit, 140).

The PV 110 generates power using solar energy, and the ESS 120 receives the power generated from the PV 110 and charges it, and if necessary, the stored power can be supplied to the commercial power grid 20 . The EMS 130 can control the overall operation of the solar power plant, and more specifically, control the switching of the charging mode and the energy supply mode of the ESS 120 , and control the charge/discharge amount of the ESS 120 in consideration of the amount of power generation. can do. The RTU 140 may collect information from each equipment of the solar power plant and transmit the information to the external management server 10 . In addition, the management server 10 may communicate with the RTUs of the solar power plants 100-1 and 100-2, and receive information related to the operation of each power plant. In addition, the management server 10 may monitor the state of the power plant based on the corresponding information, detect an abnormal state of the power plant, and provide information about it to the user, and may remotely control the equipment of each power plant. . In an embodiment, the management server 10 and the RTU may perform communication using at least one of a wired communication means and a wireless communication means. In addition, at least one of the equipment of each solar power plant may be connected to the management server using a wireless communication means.

Through such a connection, the operation related to the charging and discharging of the operating battery related to the power generation of the photovoltaic power plant may be monitored by the management server 10, and the management server 10 may control the operation of each power plant through the commercial power grid. In relation to (20), the operation of the power plant can be optimized.

2 is a configuration diagram schematically illustrating a solar power generation system according to an embodiment of the present invention.

Referring to FIG. 2 , the configuration and connection relationship of the solar power generation system are illustrated.

The PV 110 is a device that generates power using solar energy and performs an operation related to power transmission. In an embodiment, the PV 110 may include at least one of a PV power meter, a PV VCB relay, a PV ACB relay, a PV inverter, a solar module, a power generation measuring device (PV-Meter), and a solar radiation meter.

First, a plurality of solar modules may be configured, and power is generated by using solar energy in a state connected in series or in parallel. The photovoltaic module may include at least one photovoltaic panel, and the photovoltaic module may output the generated power to the PV inverter. In an embodiment, the photovoltaic module may provide direct current to the PV inverter. In addition, the solar module may include a plurality of solar cells, through which solar energy can be converted into electrical energy to generate electric power.

A solar irradiometer is a device that measures the intensity of sunlight related to a solar module. The operation of the photovoltaic module may be controlled based on the information measured by the insolation meter, and the overall operation of the photovoltaic power plant may be controlled according to the predicted amount of power generation. As such, in order to utilize the information measured by the insolation meter in other devices, communication between devices is required, and there is a need to actively utilize changes in the measured insolation in other devices.

The PV inverter may convert DC power generated by the solar module into AC power for transmission to the commercial power grid 20 . The PV inverter serves to convert DC energy, which is electrical energy generated and supplied from the solar module, into AC energy and supply it, and may include a DC/AC inverter. The DC/AC inverter uses various semiconductor switching devices such as SCR, Transistor, IGBT, and GTO (Gate to Turn Off SCR) to convert and output AC power set in a high-frequency switching method.

PV ACB relay is an air circuit breaker, and when current flows, the coil in the relay is magnetized in the air and blocks the circuit by opening and closing the contacts. A portion of the AC power passing through the PV ACB relay may be delivered to the ESS 120 to charge the battery, and another portion may be passed through the PV VCB relay. The PV-meter may be included in this PV ACB relay, and may be configured in the form of a separate module. Such a PV-meter can measure the amount of power finally calculated by the PV inverter, and based on this, can measure the amount of power actually produced by the photovoltaic module.

PV VCB relay is a vacuum circuit breaker, and when current flows, the coil in the relay is magnetized in the vacuum valve and blocks the circuit by opening and closing the contacts. PV VCB relays can cope with higher rated voltages and lower breaking currents compared to PV ACB relays.

The PV power meter is a device for measuring the strategic amount transmitted to the commercial power grid 20 . For example, after a part of the amount of power generation is transmitted to the ESS 120 , the amount of power delivered to the commercial power grid 20 may be measured. In addition, when the amount of power generated by the solar module is small and it is necessary to transmit power to the commercial power grid 20 , the energy stored in the ESS 120 may be transmitted to the commercial power grid, and such a transmission amount can also be measured through a PV power meter. In this way, the PV watt-hour meter can measure the total amount of power transmitted from the solar power plant to the commercial power grid 20 . An example of the commercial power grid 20 may include a power transmission network of Korea Electric Power Corporation, and the solar power plant of the embodiment may also be applied to other commercial power grids 20 .

According to an embodiment, the ESS 120 may include at least one of a battery, a Battery Management System (BMS), a Power Conversion System (PCS), an ESS ACB relay, an ESS VCB relay, and an ESS watt-hour meter.

The battery is for storing power generated by the photovoltaic module of the PV 110 , and may include a plurality of battery cells. The BMS may monitor information and status of battery cells, and may manage charging and discharging of the battery. In addition, the BMS plays a role in adjusting battery cells that may have different characteristics, and performs a protection control function of the battery cells, a life prediction control function of the battery cells, or a battery charge and discharge control function, and the battery cells The battery cells are controlled so that they can be used safely with maximum performance. In an embodiment, the BMS may perform battery management under the control of the EMS 130 .

The PCS may perform power conversion through the control of the EMS 130 . According to an example, the PCS may convert DC power output from the battery into AC power to transmit it to the commercial power grid 20 , and convert the AC power supplied from the PV 110 into DC power to charge the battery. can be converted In this way, the PCS may perform power conversion according to battery charging or discharging conditions, and may monitor information on the converted power.

ESS ACB relay and ESS VCB relay, like PV ACB relay and PV VCB relay, act as air circuit breaker and vacuum circuit breaker. In addition, the ESS watt-hour meter may measure at least one of power supplied from the PV 110 to charge the battery and power supplied from the battery to the commercial power grid 20 . Through such an ESS watt-hour meter, it is possible to check the amount of power charged in the battery and the amount of power transmitted from the battery to the commercial power grid 20 .

On the other hand, the difference between the actual power generation and the reference power generation amount occurs depending on the location, season, and climate of the installed area as well as temperature and weather. That is, solar power varies according to the amount of insolation, and the power fluctuates according to the weather, so if proper control is not performed, the power supply may become unstable, and sufficient power may not be supplied to the ESS 120 . Accordingly, when the amount of power generated by the solar module does not satisfy the required amount, the solar radiation meter may detect this in advance and adjust the amount of charge charged to the battery through the control of the EMS 130 . If such information is not smoothly grasped, battery charging may be performed in a situation where the power generated from the solar module is insufficient, and in this case, the power received from the commercial power grid 20 is charged to the battery. may occur.

The EMS 130 may determine whether to store the power generated in the PV 110 in the ESS 120 or transmit it to the commercial power grid 20 in order to improve the stability of the power system. In this case, the EMS 130 may determine whether to charge the battery based on a value measured by at least one of the devices of the power plant. More specifically, the EMS 130 may determine the transmission to the commercial power grid 20 for the amount of power generation exceeding the battery capacity of the ESS 120 in the PV 110 or the amount of overtime power generation. For example, the EMS 130 may instruct the PCS to convert power for battery charging using power generation information measured in real time through a PV-meter. In addition, for this purpose, the EMS 130 may be connected to at least one of each component of the PV 110 and the ESS 120 to receive information from each component or to control each component. According to an embodiment, the EMS 130 does not depend only on some components (eg, PV-meter), and by instructing the charging of the battery by comparing it with data measured by a solar irradiometer and a PV inverter, stable power can be produced, and power can be effectively stored in the battery. Through this, it is possible to prevent a situation in which a separate electricity bill is charged by instructing the battery to be charged with an amount of power greater than the power output of the PV 110 to receive power from the commercial power grid 20 to charge the battery. .

3 is a block diagram illustrating a photovoltaic power generation system having a device for monitoring a photovoltaic power plant according to an embodiment of the present invention.

Referring to FIG. 3 , as a device to be monitored, the generation amount measuring device 330 , the battery management device 340 , the solar radiation measuring device 350 , the PV inverter 360 , the power distribution device 370 , and the bidirectional power At least one of the conversion devices 380 may be included.

Here, the power generation measuring device 330 performs an operation corresponding to the PV-meter of FIG. 2 , the battery management device 340 performs an operation corresponding to the BMS, and the insolation measuring device 350 corresponds to the insolation meter , the PV inverter 360 may perform an operation corresponding to the PV inverter, and the bidirectional power conversion device 380 may perform an operation corresponding to the PCS. In addition, the power distribution device 370 may include an electronic panel related to power reception and distribution between the solar power plant system and the commercial power grid 20 .

Each device of the solar power plant according to an embodiment of the present invention may be provided with a monitoring device 300 . The monitoring device 300 may be provided in the RTU 310 as well as the monitoring target device. In addition, although not shown in the embodiment, the monitoring device 300 may also be provided in the EMS.

According to an embodiment, the monitoring device 300 of the present invention may monitor communication between each device in the power plant, and communicate with the management server 320 through wireless communication including Internet of Things (IoT) communication. can be done In an embodiment, the monitoring device 300 may perform narrowband Internet of Things (NB-IoT). In an embodiment, the IoT module of the monitoring device 300 may have a built-in microcomputer to communicate with each device in the power plant system, and monitor communication between the devices. Meanwhile, in an embodiment, the monitoring device 300 may be connected to the management server 320 through a commercial NB-IoT network, but is not limited thereto.

Each device of the solar power plant system of the present invention may continuously transmit information related to operation to the RTU 310 through a local network. In an embodiment, each device may transmit at least one of information about the current state and the driving state, and the local network may use the Modbus TCP protocol. According to an embodiment, each device of the power plant system may transmit operation-related information to the RTU 310 every second through a wired network. In addition, the RTU 310 may transmit at least a portion of the received information to the management server 320 , and the management server 320 may record at least a portion of the received information. In an embodiment, the RTU 310 and the management server 320 may perform communication through at least one of a wired network and a wireless network, and such a wired network and a wireless network may be performed through a commercial communication service.

In addition, the monitoring device 300 connected to each device of the power plant can monitor communication between the device and other devices, and when a communication error is detected, information related to the communication error through wireless communication with the management server 320 can pass If no error occurs, the monitoring device 300 may continuously monitor the communication between the corresponding device and other devices.

As described above, each device of the power plant is provided with a monitoring device 300 for monitoring local network communication, and through this, the communication abnormality is checked, and the monitoring device 300 transmits information about the communication abnormality to the management server 320 through the wireless network. By providing through the , the management server 320 can easily check the communication abnormality between the equipment of the power plant, and perform a corresponding action. More specifically, when a communication error of the corresponding equipment occurs, the monitoring device 300 transmits at least some of the information about the corresponding equipment and the information not transmitted in relation to the corresponding equipment based on the monitoring information to the management server ( 320) can be transmitted.

On the other hand, in the embodiment, the monitoring device 300 may check communication abnormality when a data request is repeated from a specific device but a response is not received in performing communication monitoring between the respective devices. In this case, the monitoring device 300 may directly request data from the target communication device, receive information that has not been received beyond communication, and transmit the corresponding information to the management server 320 using wireless communication.

In addition, in an embodiment, when the monitoring device 300 checks communication abnormality, at least a portion of the current state information of the corresponding device and information included in the final communication may be transmitted to the management server 320 . The information included in the final communication may include information communicated immediately before the communication abnormality, and the management server 320 may check the final data received before the communication abnormality through this. Meanwhile, in an embodiment, symptoms due to communication abnormality may vary depending on communication equipment. First, if an error occurs in the switching hub, communication with a specific device may not be possible, or communication between all internal devices may not be possible. In an embodiment, the monitoring device 300 may communicate with other monitoring devices, and through this, may detect an abnormal communication state of the entire device. In addition, when the management server 320 confirms the occurrence of a communication error from the monitoring device corresponding to each device of the power plant within a specific time period, it is possible to check the abnormality of the switching hub. That is, when there is no data transmitted/received between devices for a specific time, it may be determined as a communication error of the switching hub. In addition, in the embodiment, communication is performed between the RTU 310 and each device, but when external communication using a commercial network is not performed, it can be confirmed that there is an abnormality in the telecommunication company modem, and such monitoring is performed by the RTU 310 ) can be performed by a monitoring device connected to Also, in the embodiment, when neither communication inside and outside the power plant is performed, it may be detected that an abnormality has occurred in the router used in the power plant. In this way, the abnormal state information detected by each monitoring device can be checked, and the communication equipment in which the abnormality has occurred can be checked accordingly, and the management server 320 receives such information and performs a corresponding action based on it. above can be solved.

When such a communication error occurs, information cannot be exchanged between devices that need to communicate for photovoltaic power generation, resulting in overcharging or charging the battery by receiving power from the commercial power grid. have. The present invention can effectively determine an abnormal state by providing such a monitoring device 300 and performing a monitoring operation and a report thereto to the management server 320 .

In this regard, FIG. 4 is a flowchart illustrating a method for monitoring a solar power plant according to an embodiment of the present invention with reference to FIG. 3 .

Referring to FIG. 4 , in step 401 , the monitoring device 300 may monitor wired communication related to the monitoring target device in the solar power plant. In an embodiment, the device to be monitored may communicate with other devices in the power plant. In an embodiment, the target device may communicate with the energy management device, and the monitoring device 300 may monitor the corresponding wired communication and check communication data. The monitoring target device according to an embodiment includes the above-described power generation measuring device 330 , the battery management device 340 , the solar radiation measuring device 350 , the PV inverter 360 , the power distribution device 370 , and the bidirectional power conversion device. It may include at least one of (380). The energy management device may include at least one of the EMS (not shown) and the RTU 310 , and may manage the operation of equipment in the solar power plant. In this case, wired communication uses a local network, and may be communication using Ethernet.

When the monitoring target device and the energy management device are in a normal state in which no communication error occurs, the monitoring target device may transmit and receive status information and operation history information of the monitoring target device in real time through wired communication. For example, the current status and operation status of each module may be transmitted using the Modbus TCP protocol, and more specifically, the corresponding information may be transmitted to the RTU 310 once per second through Ethernet. In addition, the RTU 310 may transmit the received status information and operation history information of the monitoring target device to the management server 320 through wired or wireless communication. According to an embodiment, separately from data transmission through a wired network or data transmission through a wireless network when an error occurs, the management server 320 may manually request to transmit a current data value to a monitoring target device or an energy management device. In this case, the monitoring target device or the energy management device may separately transmit the real-time measurement value to the management server 320 .

Based on the monitoring result in step 401 , in step 403 , it may be checked whether a communication state between the monitoring target device and the energy management device is abnormal.

According to an embodiment, while the EMS is continuously requesting data from the PCS, there may be no response from the PCS for more than a certain period of time. For example, when the amount of power converted based on data communication between EMS and PCS is 0kW or there is no response to the monitored signal, the communication abnormality can be checked. In this case, the IoT module, which is the monitoring device 300 according to an embodiment, may monitor wired communication content between the EMS and the PCS. When the IoT module detects that the response of the PCS is not transmitted to the EMS or that the response is not transmitted for more than a predetermined time during monitoring, the IoT module may determine that a communication status abnormality has occurred in the solar power plant system.

When the communication state abnormality is confirmed in step 403, the monitoring device of the present invention may stop wired communication between each module in the power plant and the energy management device. If wired communication is maintained despite communication failure, charging and discharging of the battery can be controlled with an incorrect measurement value, in which case excessive discharge to the commercial power grid 20 or unnecessary power from the commercial power grid 20 can be controlled. Because it can be recharged. Meanwhile, in an embodiment, the monitoring device may transmit at least a portion of information related to an abnormal state and communication successful information to the management server 320 without separate control of wired communication when an abnormal state occurs.

When the communication state abnormality is not confirmed in step 403 , the monitoring device 300 may continuously monitor wired communication between the monitoring target device and the energy management device. At this time, the monitoring device monitors the normally transmitted/received data, and does not separately request information related to communication status abnormalities. In this way, when information is normally exchanged between devices in the power plant, the monitoring target device and the energy management device exchange data per second, and the data may be transmitted to the management server 320 through the RTU 310 . Specifically, a value related to the operation of the device to be monitored is transmitted to the RTU 310 through wired communication, and at least some of the information received by the RTU 310 is transferred to the management server 320 using wired communication or wireless communication. can be transmitted In this case, wired communication may be distinguished from a local network by a communication company line such as the Internet, and a monitoring device such as IoT is also mounted on the RTU 310 to communicate wirelessly with the management server 320 .

On the other hand, when the communication state abnormality is checked, in step 405 , the monitoring device 300 may transmit an information request related to the communication state abnormality to at least one of the monitoring target device and the energy management device. And in step 407, the monitoring device 300 may receive a response corresponding to the request from at least one of the monitoring target device and the energy management device. According to an embodiment, the response is received through wireless communication, and may include a response time and a final data value measured by a corresponding module.

According to an embodiment, when the monitoring device 300 detects a communication status abnormality, for each module to which the monitoring device 300 is attached, the current status of each module or the measured final data value when the communication status abnormality occurs It is possible to request the last communication value with the energy management device including the. In an embodiment, the last communication value may include information last transmitted through communication, and may include generation time information of the corresponding information and identification information corresponding to the corresponding information. By including such identification information, unnecessary duplication of data can be prevented when information related to the operation of the corresponding device is stored.

Also, according to an embodiment, when detecting a communication state abnormality, the monitoring device 300 may request a final data value measured in the corresponding module for a specific module in which a communication error occurs and receive it as a response. Specifically, when data transmission/reception is not performed between modules even though there is no error information or abnormal information in the data value monitored by the monitoring device 300, it may be determined that the communication state is abnormal. Conversely, when it is determined that the data value received from a specific module contains error information or abnormal information due to a failure occurring in the module itself, it can be considered that a communication error has occurred in the corresponding module. For example, when the IoT module detects that the communication state is abnormal because the response of the PCS is not transmitted during communication between the EMS and the PCS, the IoT module may request the current state or the last communication value from the EMS or PCS. In addition, the IoT module may receive, as a response, the last data value at the time or immediately before the occurrence of the problematic module and the communication error of the module from the EMS or PCS. According to one embodiment, the final data value is DCV, ACV-R, ACV-S and ACV-T values at the time of the error occurrence or DCA, DCV, DCKW, ACA-R, ACA-S, ACV-R immediately before the error occurrence. , ACV-S, ACV-T and ACKW values.

In step 409, the monitoring device 300 may transmit at least a part of the response received in step 405 to the management server 320 through wireless communication. According to an embodiment, the monitoring device 300 may transmit information on the module in which the abnormality has occurred and the final communication history of each module to the management server 320 . For example, it is possible to transmit the presence or absence of abnormalities in the respective communication devices and the presence or absence of abnormalities in modules in the power plant. Meanwhile, since wired communication is interrupted due to the occurrence of a communication error, the monitoring device 300 may communicate with the management server 320 through wireless communication. According to an embodiment, the monitoring device 300 may use a protocol corresponding to wired communication when performing wireless communication.

According to the present invention, when the communication state abnormality is confirmed, the monitoring device 300 may request information related to the communication state abnormality from the monitoring target device or the energy management device, and a response is transmitted from the monitoring target device to the energy management device It may include a part of the information that succeeded and a part of the information that the transmission failed. That is, the measurement value transmitted from each module to the energy management device until just before the communication error and the measurement value that is not transmitted to the energy management device due to the communication error may be collected in the monitoring device as a value related to the communication state abnormality. Through this, the management server 320 may determine in which module the problem occurred by comparing the measured values before and after the communication error. In addition, when it is determined that the problem does not occur in the module by comparing the measured values before and after the communication error, the management server 320 may determine that the problem occurs in the network equipment, not the device. On the other hand, according to an embodiment, an environmental sensor may be basically provided in a power plant facility, and the monitoring device 300 requests information from the environmental sensor, and transmits information such as a power outage or a fire detected by the environmental sensor wirelessly. It may be transmitted to the management server 320 .

According to an embodiment, the management server 320 may analyze the received response to determine information about resetting each module. In addition, the reset information may be transmitted to at least one of a monitoring target device and an energy management device. For example, as a result of analyzing the information received before and after the communication error received as a response, the PV inverter operates normally, but it may be determined that an error has occurred in the PV-meter. At this time, the management server 320 may take a reboot action remotely by transferring information about the reset to reset the power of the PV-meter to the PV-meter. According to an embodiment, resetting the power of the module may include resetting communication equipment connected to the module, which may mean resetting the wired commercial network connected to the RTU 310 . Also, in an embodiment, an abnormal state may occur due to an error in communication-related equipment. In this case, you can perform a reset on the failed device.

According to an embodiment, when the management server 320 compares the measured values before and after the communication error and determines that a problem has occurred in the network equipment of the power plant system, the information on the reset is based on at least one of a switching hub, a modem, and a router. It may be information that For example, when a problem occurs in the switching hub, wired communication may not be smoothly performed in a specific module, or an error may occur in wired communication in the entire power plant system. In addition, when a problem occurs in the modem, an error may occur in communication with the outside of the power plant system. And, when a problem occurs in the router, an error may occur in wired communication both outside the power plant system and inside the system. As such, it is possible to determine whether the problem is with the switching hub, the modem, or the router according to the error pattern of the network communication, so that the information about the reset for the reboot action may be different.

According to the solar power plant monitoring apparatus according to an embodiment of the present invention, since data can be collected on the equipment in the photovoltaic power plant, the system itself can determine whether the equipment is abnormal. In addition, since the solar power generation monitoring device is wired and wirelessly redundant, it may be possible to respond through the management server 320 even if the RTU 310 fails to receive real-time power-related information due to a communication error in the power plant.

5 is a block diagram schematically illustrating a step of storing a first information response in a database in an energy management device according to an embodiment of the present invention.

According to an embodiment of the present invention, before a communication error occurs, the monitoring target device and the energy management device exchange the current status and operation status of each module every second by wire. The data for each module is transmitted to the RTU 510 in the energy management device and transmitted from the RTU 510 to the management server 520 . In addition, the real-time data for each module transmitted to the management server 520 may be separately stored in a storage device of the management server 520 or may be stored in a virtual data center through the Internet. For example, real-time data for each module may be stored on the cloud 521 associated with the management server 520 , and in this case, it may be classified according to the properties of the data and stored in the database. Specifically, according to the frequency of data utilization, frequently used data (hot data) may be stored in the hot database 523 , and in the case of rarely used data (cold data), it will be stored in the cold database 522 . Each database can use a different storage medium or encoding format according to the access frequency, and information received separately according to the occurrence of an abnormal condition can be stored in a separate DB or table. In this case, when the abnormal state is recovered in the future, information on the existing operation state can be received based on the received information corresponding to it, and information about the operation state of each equipment, including information caused by the abnormal state, The operation of the management server 520 may be performed so that it can be stored without duplication.

On the other hand, when the communication state abnormality is confirmed, the monitoring device requests information related to the communication state abnormality to the monitoring target device or the energy management device, receives a response thereto, and transmits the received response to the management server 520 through wireless communication. ) can be transmitted. Information related to the communication state abnormality transmitted to the management server 520 is transmitted to the RTU 510 through a wired line (eg, the Internet), and may be stored in the local server 511 associated with the RTU 510 . . In other words, since the information related to the communication state abnormality is used to resolve the communication error before the recovery of the wired network, it may be stored in the local database 512 of the local server 511 in the energy management device. In addition, in an embodiment, information related to an abnormal state may be stored separately in a DB or table in the RTU 510 . The separated and stored information may be stored in a form in which, when an abnormal state of the corresponding equipment is restored, it is merged with the normally operated data and then deduplicated to check the operation history of the corresponding equipment.

According to an embodiment, the final data for each module or the module in which a problem occurs and the final data of the corresponding module may be stored in the local database 512 . In addition, the response received by the monitoring device may include a part of information that has been successfully transmitted from the monitoring target device to the energy management device and a part of information that has failed to be transmitted, and a part of the response is sent to the cloud 521 of the management server 520 . , some of the responses may be stored in a different database than data transmitted through wired communication, that is, in a local database 512 of the local server 511 .

Meanwhile, when the wired network is restored due to the recovery of the communication state abnormality, data communication using the wired network may be resumed between the monitoring target device and the energy management device. According to an embodiment, the information related to the communication state abnormality stored in the local database may be stored again in the cloud 521 of the management server 520 when the communication state abnormality is recovered.

6 is a schematic configuration diagram of an RTU of a solar power plant according to an embodiment of the present invention.

Referring to FIG. 6 , the RTU 610 may include a main processor 611 , a verification processor 612 , and a serial port. According to an embodiment, the main processor 611 may include a main CPU, and the verification processor 612 may include a CPU for performing checksum. In addition, the serial port may include an RS-232 port 613 and an RS-485 port 614 .

The verification processor 612 monitors wired communication between each module and the energy management device using the monitoring device 615 in order to respond to errors occurring in each module in the power plant system.

The main processor 611 may perform serial communication with the outside using a serial port. According to an embodiment, the RS-232 port 613 may allow a monitoring device and other communication equipment (eg, a switching hub, a modem and a router, etc.) to communicate. Also, the RS-485 port 614 may communicate with modules in the power plant system to receive data. For example, the amount of power conversion measured by the PCS, information about the amount of insolation measured by the insolation meter, etc. may be transmitted to the RTU 610 through the RS-485 port 614 .

Meanwhile, the RTU 610 communicates with each component using Ethernet inside the device, and may communicate with the management server 620 by wire or wirelessly. According to an embodiment, the RTU 610 may directly communicate with the management server 620 using the Internet, or may communicate wirelessly through a monitoring device 615 (eg, an IoT module). Meanwhile, in an embodiment, the RTU 610 may be included as a part of the EMS or may be configured as a separate module. In addition, in the embodiment, the NB-IoT 615 is also described as a configuration included in the RTU 610 for wired and wireless communication duplication, but may be implemented through a separate module.

7 is a block diagram illustrating a monitoring method using an apparatus for monitoring a solar energy power plant according to an embodiment of the present invention.

Referring to FIG. 7 , the monitoring device 700 may monitor wired communication between the monitoring target device 710 and the energy management device 720 , and check whether the communication state is abnormal based on the monitoring result. According to an embodiment, the monitoring target device 710 may include at least one of a generation amount measuring device, a battery management device, a solar radiation measuring device, an inverter, a power distribution device, and a bidirectional power conversion device. In addition, the energy management device 720 may include an EMS and an RTU.

According to an embodiment, the energy management device 720 may request the current state and operation status information of each module of the monitoring target device 710 from the monitoring target device 710 . In response to such an information request, the monitoring target device 710 may transmit the corresponding information to the energy management device 720 through wired communication, and the information may be transmitted from the energy management device 720 to the management server 730 . On the other hand, the monitoring device 700 can check whether the communication state is abnormal based on whether a response is not transmitted to the information request and a time when a response is not transmitted after transmission of the information request in order to check whether the communication state is abnormal. have.

When the communication state abnormality is identified, the monitoring device 700 may request information related to the communication state abnormality from at least one of the monitoring target device 710 and the energy management device 720 . In addition, the monitoring device 700 receives a response corresponding to the information request from at least one of the monitoring target device 710 and the energy management device 720, and transmits at least a portion of the response to the management server 730 through wireless communication. can be transmitted

In addition, the data transmitted to the management server 730 is used to analyze a communication state abnormality and to generate information about resetting the device. Accordingly, the management server 730 may transmit the reset information to at least one of the monitoring target device 710 and the energy management device 720 to proceed with the recovery of the wired network. According to an embodiment, since the communication state abnormality may be based on a network problem, the information on the reset may be information based on at least one of a switching hub, a modem, and a router.

According to an embodiment, the information related to the communication state abnormality may include a part of information that has been successfully transmitted from the monitoring target device 710 to the energy management device 720 and a part of information that has failed to be transmitted. In addition, at least a portion of the information related to the communication state abnormality may be stored in a different database from data transmitted through wired communication, that is, a portion of the successfully transmitted information.

On the other hand, when the communication state abnormality is not confirmed, information related to the monitoring target device 710 may be transmitted from the RTU within the energy management device 720 to the management server 730, at this time the RTU and the management server 730 can communicate wirelessly and wired.

In the present specification and drawings, preferred embodiments of the present invention have been disclosed, and although specific terms are used, these are only used in a general sense to easily explain the technical content of the present invention and help the understanding of the present invention. It is not intended to limit the scope. It will be apparent to those of ordinary skill in the art to which the present invention pertains that other modifications based on the technical spirit of the present invention can be implemented in addition to the embodiments disclosed herein.

Claims (18)

In the monitoring method of the solar power plant monitoring device,
monitoring wired communication between the plurality of monitored devices and the energy management device;
checking whether the communication state is abnormal based on the monitoring result;
transmitting first request information related to the communication state abnormality to at least one of the plurality of monitoring target devices and the energy management device when the communication state abnormality is identified;
receiving first response information corresponding to the first request information from at least one of the plurality of monitoring target devices and the energy management device; and
Transmitting at least a portion of the first response information from the monitoring device to a management server through wireless communication,
Based on the first response information, the abnormal state of the monitoring target device or the network device of the photovoltaic power plant in which the abnormality has occurred among the plurality of monitoring target devices is confirmed,
When device abnormality information is included in the first response information, the monitoring target device that has transmitted the first response information is identified as the monitoring target device in which the abnormality occurred,
When device abnormality information is not included in the first response information, the state abnormality of the network device is checked. According to claim 1,
The monitoring method, wherein the monitoring target device transmits the status information and operation history information of the monitoring target device to the management server through the wired communication. According to claim 1,
At least a portion of the first response information transmitted to the management server is stored in a different database than the data transmitted through the wired communication, monitoring method. According to claim 1,
The step of checking whether the communication state is abnormal,
Whether the second response information is not transmitted from the monitoring target device with respect to the second request information transmitted from the energy management device to the monitoring target device, and the time during which the second response information is not transmitted after the second request information is transmitted Containing the step of determining whether the communication state abnormality based on, monitoring method. According to claim 1,
The first response information includes a part of information that has been successfully transmitted from the monitoring target device to the energy management device and a part of information that has failed to be transmitted, a monitoring method. According to claim 1,
The monitoring target device includes at least one of a power generation measurement device, a battery management device, a solar radiation measurement device, an inverter, a power distribution device, and a bidirectional power conversion device. According to claim 1,
The management server transmits, based on the transmitted first response information, information on device reset to at least one of a monitoring target device in which the abnormality occurs and a network device in which the abnormality occurs. 8. The method of claim 7,
The information on the reset of the network device in which the status abnormality has occurred is information based on at least one of a switching hub, a modem, and a router. According to claim 1,
When the communication state abnormality is not confirmed, information related to the monitoring target device is transmitted from the remote terminal of the solar power plant to the management server, and the remote terminal and the management server communicate wirelessly and by wire, monitoring method . In the monitoring device for monitoring a solar power plant,
The monitoring device is
monitor wired communication between the monitored device and the energy management device;
Check the communication status abnormality based on the monitoring result,
When the communication state abnormality is confirmed, transmitting the first request information related to the communication state abnormality to at least one of the monitoring target device and the energy management device,
Receiving first response information corresponding to the first request information from at least one of the monitoring target device and the energy management device,
It characterized in that at least a part of the first response information is transmitted to the management server through wireless communication,
Based on the first response information through the management server, a state abnormality of a monitoring target device or a network device of the photovoltaic power plant in which an abnormality occurs among a plurality of monitoring target devices is checked,
When device abnormality information is included in the first response information, the monitoring target device that has transmitted the first response information is identified as the monitoring target device in which the abnormality occurred,
When the device abnormality information is not included in the first response information, the state abnormality of the network device is checked. 11. The method of claim 10,
The monitoring target device, the monitoring device, characterized in that for transmitting the state information and the operation history information of the monitoring target device to the management server through the wired communication. 11. The method of claim 10,
At least a portion of the first response information transmitted to the management server is characterized in that stored in a different database than the data transmitted through the wired communication, monitoring device. 11. The method of claim 10,
The monitoring device, in order to check whether the communication state is abnormal,
Whether the second response information is not transmitted from the monitoring target device with respect to the second request information transmitted from the energy management device to the monitoring target device, and the time during which the second response information is not transmitted after the second request information is transmitted A monitoring device, characterized in that for checking whether the communication state is abnormal based on 11. The method of claim 10,
The first response information is a monitoring device, characterized in that it includes a part of the information that has been successfully transmitted from the monitoring target device to the energy management device and a part of the information that has failed to be transmitted. 11. The method of claim 10,
The monitoring target device comprises at least one of a power generation measurement device, a battery management device, a solar radiation measurement device, an inverter, a power distribution device, and a two-way power conversion device, the monitoring device. 11. The method of claim 10,
The management server, based on the transmitted first response information, characterized in that for transmitting the information about the reset of the device to at least one of the monitoring target device in which the abnormality occurred and the network device in which the state abnormality occurred, the monitoring device . 17. The method of claim 16,
The information on the reset of the network device in which the status abnormality has occurred is information based on at least one of a switching hub, a modem, and a router. 11. The method of claim 10,
When the communication status abnormality is not confirmed, information related to the monitoring target device is transmitted from the remote terminal of the solar power plant to the management server, and the remote terminal and the management server communicate wirelessly and by wire. which, monitoring device.

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