CN112235743A - ZigBee-based photovoltaic power generation electric energy quality monitoring system and monitoring method - Google Patents
ZigBee-based photovoltaic power generation electric energy quality monitoring system and monitoring method Download PDFInfo
- Publication number
- CN112235743A CN112235743A CN202010945590.0A CN202010945590A CN112235743A CN 112235743 A CN112235743 A CN 112235743A CN 202010945590 A CN202010945590 A CN 202010945590A CN 112235743 A CN112235743 A CN 112235743A
- Authority
- CN
- China
- Prior art keywords
- quality monitoring
- zigbee
- power quality
- zigbee coordinator
- routing
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
- 238000012544 monitoring process Methods 0.000 title claims abstract description 148
- 238000010248 power generation Methods 0.000 title claims abstract description 38
- 238000000034 method Methods 0.000 title claims description 16
- 238000004891 communication Methods 0.000 claims abstract description 84
- 238000012545 processing Methods 0.000 claims abstract description 7
- 230000006855 networking Effects 0.000 claims abstract description 5
- 238000007405 data analysis Methods 0.000 claims description 10
- 230000002776 aggregation Effects 0.000 claims description 9
- 238000004220 aggregation Methods 0.000 claims description 9
- 238000009432 framing Methods 0.000 claims description 9
- 238000013524 data verification Methods 0.000 claims description 6
- 238000012423 maintenance Methods 0.000 claims description 6
- 238000005070 sampling Methods 0.000 claims description 4
- 230000005540 biological transmission Effects 0.000 abstract description 24
- 238000010586 diagram Methods 0.000 description 8
- 230000008054 signal transmission Effects 0.000 description 6
- 238000005516 engineering process Methods 0.000 description 5
- 230000008569 process Effects 0.000 description 5
- 238000003860 storage Methods 0.000 description 4
- 230000008859 change Effects 0.000 description 2
- 238000006243 chemical reaction Methods 0.000 description 2
- 125000004122 cyclic group Chemical group 0.000 description 2
- 238000013461 design Methods 0.000 description 2
- 230000003993 interaction Effects 0.000 description 2
- 230000000007 visual effect Effects 0.000 description 2
- 230000002159 abnormal effect Effects 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000005286 illumination Methods 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 239000011159 matrix material Substances 0.000 description 1
- 238000005259 measurement Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000002265 prevention Effects 0.000 description 1
- 238000001228 spectrum Methods 0.000 description 1
- 238000012800 visualization Methods 0.000 description 1
Images
Classifications
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W4/00—Services specially adapted for wireless communication networks; Facilities therefor
- H04W4/30—Services specially adapted for particular environments, situations or purposes
- H04W4/38—Services specially adapted for particular environments, situations or purposes for collecting sensor information
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L45/00—Routing or path finding of packets in data switching networks
- H04L45/24—Multipath
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W40/00—Communication routing or communication path finding
- H04W40/02—Communication route or path selection, e.g. power-based or shortest path routing
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02D—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN INFORMATION AND COMMUNICATION TECHNOLOGIES [ICT], I.E. INFORMATION AND COMMUNICATION TECHNOLOGIES AIMING AT THE REDUCTION OF THEIR OWN ENERGY USE
- Y02D30/00—Reducing energy consumption in communication networks
- Y02D30/70—Reducing energy consumption in communication networks in wireless communication networks
Landscapes
- Engineering & Computer Science (AREA)
- Computer Networks & Wireless Communication (AREA)
- Signal Processing (AREA)
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Remote Monitoring And Control Of Power-Distribution Networks (AREA)
Abstract
The invention relates to a ZigBee-based photovoltaic power generation electric energy quality monitoring system, which comprises: the acquisition terminal equipment is used for acquiring the power quality monitoring data and sending the power quality monitoring data to the ZigBee coordinator; the routing equipment is used for carrying out communication contact of signal relay among the acquisition terminal equipment and between the acquisition terminal equipment and the ZigBee coordinator; the ZigBee coordinator is used for receiving the power quality monitoring data sent by the routing equipment; the acquisition terminal equipment, the routing equipment and the ZigBee coordinator adopt a mesh topology structure to carry out wireless networking; and the monitoring background is used for receiving the power quality monitoring data sent by the ZigBee coordinator and analyzing and processing the power quality monitoring data. The electric energy quality monitoring data of the acquisition terminal equipment can be transmitted through a plurality of routing devices, and a transmission path is not unique, so that the communication reliability of the photovoltaic power station is improved, the distance of extending communication signals can be achieved through the routing devices, and the problem of difficulty in field wiring is further solved.
Description
Technical Field
The invention relates to a photovoltaic power generation power quality monitoring system, in particular to a ZigBee-based photovoltaic power generation power quality monitoring system and a ZigBee-based photovoltaic power generation power quality monitoring method.
Background
The quality of the electric energy refers to the quality of the electric energy in the electric power system. As is well known, the ideal voltage and current are sinusoidal with a frequency of 50Hz, and in an ideal three-phase system, the voltage and current of each phase are equal in amplitude and symmetrical in phase. However, because the ideality of each element, such as a generator, a transformer and a line, cannot be guaranteed in the production process, the load symmetry and the linearity are uncertain due to the change of parameters in the operation process. Meanwhile, in photovoltaic power generation, the problems of harmonic waves, waveform distortion and other electric energy quality are easily caused by photovoltaic power generation due to the fact that the investment of a large number of nonlinear power electronic devices and the illumination intensity are constantly changed.
Due to the fact that the photovoltaic modules of the large-scale photovoltaic power station are distributed and dispersed, and correspondingly, the data acquisition devices are also dispersed, so that the branch lines of information transmission are more and relatively short in distance, and in addition, the photovoltaic power station is built in a complex geographical environment, and possible electromagnetic environment factors such as interference generated by solar wind and nearby high-voltage lines are difficult to wire and reliable communication cannot be guaranteed. The conventional power quality monitoring system cannot solve the above problems.
Disclosure of Invention
Therefore, it is necessary to provide a photovoltaic power generation power quality monitoring system and a monitoring method with simple wiring and high communication reliability.
In order to achieve the above object, the present invention provides a photovoltaic power generation power quality monitoring system based on ZigBee, comprising:
the acquisition terminal equipment is used for acquiring power quality monitoring data and sending the power quality monitoring data to the ZigBee coordinator;
the routing equipment is used for carrying out communication of signal relay among the acquisition terminal equipment and between the acquisition terminal equipment and the ZigBee coordinator;
the ZigBee coordinator is used for receiving the power quality monitoring data sent by the routing equipment, and comprises:
the processor module is used for carrying out aggregation and framing on the electric energy quality monitoring data;
the power supply module supplies power in a sleep mode;
the communication module is used for communication connection between the routing equipment and the ZigBee coordinator and between the ZigBee coordinator and the monitoring background;
the monitoring background is used for receiving the power quality monitoring data sent by the ZigBee coordinator and analyzing and processing the power quality monitoring data;
the acquisition terminal equipment, the routing equipment and the ZigBee coordinator adopt a mesh topology structure to carry out wireless networking.
In one embodiment, the acquisition terminal device is installed on an inverter of a photovoltaic array and is used for acquiring sampling point data sent by the inverter.
In one embodiment, the collection terminal device has a routing function.
In one embodiment, the mesh topology comprises:
the ZigBee coordinator node is used as a main control node of the network and is responsible for the establishment and maintenance functions of the network;
the routing equipment nodes are used for relaying and forwarding information and maintaining the normal state of the network;
and a plurality of acquisition equipment terminal nodes.
Furthermore, the ZigBee coordinator node is in communication connection with the routing equipment node and the acquisition equipment terminal node;
the routing equipment node is in communication connection with the acquisition terminal equipment node;
the routing equipment nodes can be directly connected in a communication mode, and a multi-routing communication channel is constructed.
In one embodiment, the devices with routing function can be connected in communication.
In one embodiment, the above photovoltaic power generation power quality monitoring system based on ZigBee further includes:
the dispatching monitoring center comprises at least one of a computer, a smart phone, a desktop computer and the like;
and the monitoring background is in communication connection with the dispatching monitoring center through at least one communication mode of Ethernet communication, GPRS, 3G, 4G and 5G, and sends the processed power quality monitoring data.
In one embodiment, the time for the ZigBee coordinator to enter the working mode from the sleep mode is 15 ms.
The invention also provides a ZigBee-based photovoltaic power generation electric energy quality monitoring method, which comprises the following steps:
collecting power quality monitoring data;
sending the power quality monitoring data to the ZigBee coordinator through a routing device;
the ZigBee coordinator receives the power quality monitoring data, then carries out aggregation and framing and sends the power quality monitoring data to a monitoring background;
the monitoring background receives the power quality monitoring data, performs data analysis, data verification and data analysis, and stores analyzed data information;
and the monitoring background sends the analyzed data information to a dispatching monitoring center.
Further, before the ZigBee coordinator receives the power quality monitoring data and then performs aggregation and framing, the method further includes:
and monitoring whether the received power quality monitoring data is correct or not, and if not, re-receiving the power quality monitoring data.
Above-mentioned photovoltaic power generation power quality monitoring system based on zigBee, through adopt netted topological structure to carry out wireless network deployment between collection terminal equipment, routing equipment, the zigBee coordinator, collection terminal equipment's power quality monitoring data can be transmitted through a plurality of routing equipment, and transmission path is not unique, has consequently increased photovoltaic power plant's communication reliability, still can play the distance of extending communication signal through routing equipment moreover, has further solved the problem of field wiring difficulty. In addition, the power supply module of the ZigBee coordinator adopts a sleep mode, so that the power consumption of the coordinator is further reduced.
Drawings
In order to more clearly illustrate the technical solutions in the embodiments or the conventional technologies of the present application, the drawings used in the descriptions of the embodiments or the conventional technologies will be briefly introduced below, it is obvious that the drawings in the following descriptions are only some embodiments of the present application, and for those skilled in the art, other drawings can be obtained according to the drawings without creative efforts.
FIG. 1 is a schematic structural diagram of a ZigBee-based photovoltaic power generation power quality monitoring system according to an embodiment;
FIG. 2 is a schematic diagram of an internal structure of a ZigBee coordinator according to an embodiment;
FIG. 3 is a schematic diagram of a mesh topology according to an embodiment;
FIG. 4 is a schematic structural diagram of a ZigBee-based photovoltaic power generation power quality monitoring system according to another embodiment;
FIG. 5 is a schematic flow chart of a ZigBee-based photovoltaic power generation power quality monitoring method according to an embodiment;
fig. 6 is a schematic structural diagram of a photovoltaic power generation power quality monitoring system based on carrier communication.
Detailed Description
To facilitate an understanding of the present application, the present application will now be described more fully with reference to the accompanying drawings. Embodiments of the present application are set forth in the accompanying drawings. This application may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete.
Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs. The terminology used herein in the description of the present application is for the purpose of describing particular embodiments only and is not intended to be limiting of the application.
It will be understood that, as used herein, the terms "first," "second," and the like may be used herein to describe various elements, but these elements are not limited by these terms. These terms are only used to distinguish one element from another. For example, a first resistance may be referred to as a second resistance, and similarly, a second resistance may be referred to as a first resistance, without departing from the scope of the present application. The first resistance and the second resistance are both resistances, but they are not the same resistance.
It is to be understood that "connection" in the following embodiments is to be understood as "electrical connection", "communication connection", and the like if the connected circuits, modules, units, and the like have communication of electrical signals or data with each other.
As used herein, the singular forms "a", "an" and "the" may include the plural forms as well, unless the context clearly indicates otherwise. It will be further understood that the terms "comprises/comprising," "includes" or "including," etc., specify the presence of stated features, integers, steps, operations, components, parts, or combinations thereof, but do not preclude the presence or addition of one or more other features, integers, steps, operations, components, parts, or combinations thereof. Also, as used in this specification, the term "and/or" includes any and all combinations of the associated listed items.
The large photovoltaic power station generally adopts the scheme of block power generation and centralized grid connection, the photovoltaic battery converts light energy into direct current for output, low voltage is adopted to transmit electric energy before and after inversion, and high-power long-distance transmission is not suitable. The current of the photovoltaic electric energy of 0.5MWp reaches nearly kiloampere after being collected, and in order to reduce the cost and loss of an alternating current and direct current cable line before and after inversion, the distance from an inverter to a junction box should be shortened as much as possible by power station construction, so that a grid-connected inverter and a box-type boosting voltage can be arranged at the central position of each subsystem battery square matrix as much as possible. The fact that the data transmission distance required by a large photovoltaic power station is short, the number of branch lines is large, the complex geographic environment of the building area of the photovoltaic power station and possible electromagnetic environment factors such as solar wind and interference generated by nearby high-voltage lines put higher requirements on communication of the power station are determined.
Compared with the common wireless communication technologies such as Bluetooth, WiFi and infrared, the ZigBee communication technology has the following advantages: (1) the cost is low, and the price of the chip is less than 1/10 of Bluetooth; (2) low power consumption, and generally 2-5 batteries can work for more than half a year due to low speed and adoption of a sleep mode; (3) the short distance is only 75 meters in standard distance, but the transmission distance can be increased to 1-3 km by increasing the transmitting power of the antenna, and the routing node can be added to transmit the long distance; (4) the data transmission is more reliable due to the adoption of the collision prevention and problem packet retransmission strategy; (5) the data transmission is safer due to the adoption of an encryption algorithm and CRC (cyclic redundancy check) cyclic redundancy code check; (6) the capacity is large, 243 child nodes can be managed under a single main node, the main node can be managed by the upper-level node, and finally a large network with 64000 nodes can be formed; (7) the short delay is 1/10 for WiFi and Bluetooth, the node only needs 15ms from sleep to work, and only needs 30ms to search for entering the network.
Based on this, the invention provides a ZigBee-based photovoltaic power generation electric energy quality monitoring system, which comprises:
the acquisition terminal equipment is used for acquiring power quality monitoring data and sending the power quality monitoring data to the ZigBee coordinator;
the routing equipment is used for carrying out communication of signal relay among the acquisition terminal equipment and between the acquisition terminal equipment and the ZigBee coordinator;
the ZigBee coordinator is used for receiving the power quality monitoring data sent by the routing equipment, and comprises:
the processor module is used for carrying out aggregation and framing on the electric energy quality monitoring data;
the power supply module supplies power in a sleep mode;
the communication module is used for communication connection between the routing equipment and the ZigBee coordinator and between the ZigBee coordinator and the monitoring background;
the monitoring background is used for receiving the ZigBee coordinator sent by the ZigBee coordinator and analyzing and processing the ZigBee coordinator;
the acquisition terminal equipment, the routing equipment and the ZigBee coordinator adopt a mesh topology structure to carry out wireless networking.
Through adopt netted topological structure to carry out wireless network deployment between collection terminal equipment, routing equipment, the zigBee coordinator, collection terminal equipment's power quality monitoring data can be transmitted through a plurality of routing equipment, and transmission path is not unique, has consequently increased photovoltaic power plant's communication reliability, still can play the distance that extends communication signal through routing equipment moreover, has further solved the problem of on-the-spot wiring difficulty. In addition, the power supply module of the ZigBee coordinator adopts a sleep mode, so that the power consumption of the coordinator is further reduced.
Fig. 1 is a schematic structural diagram of a power quality monitoring system for photovoltaic power generation based on ZigBee in an embodiment. The monitoring system includes: the system comprises a collection terminal device 100, a routing device 200, a ZigBee coordinator 300, a monitoring background 400, a photovoltaic array 501 and an inverter 502. The power quality monitoring data collected by the collection terminal device 100 is sent to the routing device 200 by radio waves, and the routing device 200 sends the received power quality monitoring data to the ZigBee coordinator 300 by radio waves. Optionally, the collection terminal device 100 is installed on an inverter 502 connected to the photovoltaic array 501, and is configured to collect sampling point data sent by the inverter 502. In a large photovoltaic power plant, there are generally a plurality of inverters, and there are also generally a plurality of collection terminals 100 installed along with the inverters. Optionally, if the distance between the acquisition terminal device 100 and the ZigBee coordinator 300 is long, a plurality of routing devices may be added to perform communication relay contact. Alternatively, the acquisition terminal device 100 may have a routing function.
The routing device 200 is a contact device for relaying signals between the acquisition terminal device and the acquisition terminal device or between the acquisition terminal device and the ZigBee coordinator, and does not need to integrate circuits such as current and voltage acquisition and a/D conversion. In other embodiments, the routing device 200 may also integrate some circuit configurations in the collection terminal device 100, without considering the cost, and is not limited herein.
The ZigBee coordinator 300 firstly assembles and frames the received power quality monitoring data, and then sends the data to the monitoring background 400 through a serial port, namely, wired communication, and optionally, if the ZigBee coordinator 300 is far away from a monitoring room, communication connection between the ZigBee coordinator and the monitoring background can be performed by adding a routing device; if the ZigBee coordinator is far away from the monitoring room and exceeds the coverage range of the routing equipment, communication connection can be carried out through communication modes such as GPRS, 3G, 4G, 5G and the like. Optionally, the ZigBee coordinator can be also provided with a current and voltage analog quantity acquisition loop and can be used as a power quality acquisition terminal device.
The monitoring background 400 is used for receiving the power quality monitoring data sent by the ZigBee coordinator and analyzing and processing the data. Optionally, the analyzing and processing process includes performing data analysis, data verification, data analysis on the power quality monitoring data, and storing the analyzed data information; optionally, a human-computer interaction design can be performed through the function of the database, and background monitoring personnel can analyze and check the power quality state of the photovoltaic power generation system through a database visual interface.
Fig. 2 is a schematic internal structure diagram of a ZigBee coordinator according to an embodiment. The ZigBee coordinator 300 comprises a processor module 301, a power supply module 302, and a communication module 303, wherein the processor module 301 is configured to aggregate and frame the power quality monitoring data, optionally, before the processor module aggregates and frames the received power quality monitoring data, data verification is further required, whether the received data is correct or not is checked, and if the received data is incorrect, the receiving is restarted.
The power supply module 302 supplies power in a sleep mode, and optionally, the ZigBee coordinator 300 only needs 15ms from the sleep mode to the working mode, and only needs 30ms for searching to enter the network. Alternatively, the power supply module can be powered by a storage battery and an alternating current power supply.
Optionally, the communication module 303 integrates a ZigBee communication unit and a GPRS communication unit, and further has an RS232/RS485 communication interface, and can connect the monitoring background to the upper part and connect the routing device and the acquisition terminal device to the lower part in a wireless manner.
ZigBee has three standard network topological structures, and each network at most comprises nodes with three different functions, namely a ZigBee coordinator, routing equipment (full-function equipment) and acquisition terminal equipment (simplified function equipment). The ZigBee coordinator is an organizer of the network, is responsible for the establishment and maintenance of the whole network and also serves as a main control node of the whole network; the router device has the functions of information relay forwarding and assisting the ZigBee coordinator in maintaining the network, and plays a role in extending the wireless signal transmission distance. However, one ZigBee network can only have 1 ZigBee coordinator, but may have a plurality of routing devices and a plurality of acquisition terminal devices.
The above-mentioned acquisition terminal device, routing device, ZigBee coordinator adopt a mesh topology structure to perform wireless networking, as shown in fig. 3, the mesh topology structure includes: the ZigBee coordinator node is used as a main control node of the network and is responsible for the establishment and maintenance functions of the network; the routing equipment nodes are used for relaying and forwarding information and maintaining the normal state of the network; and a plurality of acquisition equipment terminal nodes.
Furthermore, the ZigBee coordinator node is in communication connection with the routing equipment node and the acquisition equipment terminal node; the routing equipment node is in communication connection with the acquisition terminal equipment node; the routing equipment nodes can be directly connected in a communication mode, and a multi-routing communication channel is constructed. Two acquisition terminal equipment need routing equipment to relay the transmission of wireless signal, if a certain routing equipment node is unusual, the transmission work of signal can be continued to other routing nodes, has improved the reliability of communication. Alternatively, communication connection can be performed between devices with routing functions. Optionally, the acquisition terminal device can be embedded into a ZigBee module, integrates a data acquisition function and a communication function, meets the requirement of a mesh topology structure for multi-channel signal transmission, greatly improves the reliability of communication, and solves the problem of communication for a large photovoltaic power station. And the standard distance of ZigBee network transmission is only 75 meters, but the transmission distance can be increased to 1-3 km by increasing the transmitting power of the antenna, and the ZigBee network transmission can transmit more distance by increasing the routing nodes without particularly complicated wiring, so that the problem of difficult communication wiring of a photovoltaic power station is solved.
On the other hand, each node of the ZigBee mesh topology structure has low information receiving and sending power consumption, a sleep mode is adopted, the routing node is very power-saving, and the ZigBee module can be powered for about half a year only by two 5 batteries. However, for the acquisition terminal device that needs to acquire current and voltage, if only two batteries of No. 5 are used for power supply, the power supply duration and the power supply reliability are difficult to be ensured, so a more reliable power supply mode needs to be considered. For equipment with functions of protection, measurement and control and the like, the most reliable power supply mode is to supply power by using a storage battery, but for a large photovoltaic power station with a severe geographic environment, the storage battery power supply mode is unrealistic, and because the acquisition terminal equipment is generally installed along with an inverter, the inverter is connected into a power grid through a boost converter, and an alternating current power supply is relatively reliable, the acquisition terminal equipment can be supplied with power after alternating current (direct current) input voltage is rectified, filtered and stabilized, and meanwhile, a rechargeable battery is used as a standby power supply. The ZigBee coordinator is generally close to a monitoring room, so that direct power supply by alternating current is very convenient, and optionally, a storage battery can be used for power supply.
The other two standard network topology structures of the ZigBee are respectively as follows: star topology networks, tree topology networks. The star network is the simplest topological structure, the ZigBee coordinator is taken as a central node, no routing node is arranged, the acquisition terminal equipment nodes are directly connected with the ZigBee coordinator, the acquisition terminal nodes need to communicate with each other and can only be forwarded through the ZigBee coordinator, the routing of data transmission among the nodes is unique, each terminal node can only be arranged in the communication range of the coordinator, the network flexibility is poor, and the star network is generally used in occasions with short distances; the tree topology network can be regarded as a set of a plurality of star networks, compared with the star networks, a plurality of routing nodes are added, so that the coverage range of the wireless network is extended, but the path of information transmission is unique.
From the perspective of communication reliability, the length of a photovoltaic array power generation unit can exceed 200m (the distance between the front row and the rear row of the photovoltaic array power generation unit is generally more than 8m in order to avoid shadow shielding) when the communication reliability is analyzed, the power quality acquisition terminal equipment is installed along with an inverter, wireless signals need to be transmitted between the two acquisition terminal equipment through routing equipment, and obviously, a star topology network is not suitable for the large photovoltaic power station; although the tree topology network can meet the transmission requirement, each terminal device signal transmission path is unique, for a large photovoltaic power station with severe site geographic environment and long transmission distance, the tree topology network is adopted to transmit power quality monitoring data, the reliability is difficult to guarantee, the signal transmission of the terminal devices connected in series at the back can be influenced by the abnormal transmission of any node, the mesh topology network can be communicated with each other among all nodes with the routing function within the effective communication radius, the mesh topology network has the network self-organizing capability, the network coordinator can quickly find the optimal path of information transmission through the routing searching function, and the information transmission path has no bottleneck. The mesh network also has a fault self-healing function, and if relevant routing nodes in the network have faults, change positions and increase or delete nodes, the whole network can complete self-healing without human intervention, so that the normal operation of the system can be guaranteed. The mesh topology is therefore the best choice.
In addition, fig. 4 is a schematic structural diagram of a power quality monitoring system for photovoltaic power generation based on ZigBee in another embodiment. The monitoring system includes: the system comprises acquisition terminal equipment 401, a ZigBee coordinator 402, a monitoring background 403 and a scheduling monitoring center 404. The acquisition terminal device 401 has a routing function, so that the power quality monitoring data acquired by the acquisition terminal device 401 is sent to the ZigBee coordinator 402 through radio waves. Optionally, the acquisition terminal device 401 is installed on an inverter connected to the photovoltaic array, and is configured to acquire sampling point data sent by the inverter. In a large photovoltaic power plant, there are generally a plurality of inverters, and there are also a plurality of collection terminals 401 installed along with the inverters. Optionally, if the distance between the acquisition terminal device 401 and the ZigBee coordinator 402 is long, a plurality of routing devices may be added to perform communication relay contact. The routing equipment is used for performing signal relay between the acquisition terminal equipment and the acquisition terminal equipment or between the acquisition terminal equipment and the ZigBee coordinator, and does not need to integrate circuits such as current and voltage acquisition, A/D conversion and the like. In other embodiments, the routing device may also integrate some circuit settings in the terminal device 401, without considering the cost, which is not limited herein.
The ZigBee coordinator 402 firstly assembles the received power quality monitoring data to form frames, and then sends the data to the monitoring background 403 through serial ports, namely wired communication, and optionally, if the ZigBee coordinator 402 is far away from a monitoring room, communication connection between the ZigBee coordinator 402 and the monitoring background 403 can be performed by adding routing equipment; if the ZigBee coordinator 402 is far from the monitoring room and exceeds the coverage of the routing device, communication connection can be performed through communication modes such as GPRS, 3G, 4G, and 5G.
The monitoring background 403 is configured to receive, analyze and process the power quality monitoring data sent by the ZigBee coordinator, and further send the analyzed and processed power quality monitoring data to the scheduling monitoring center 404. Optionally, the analyzing and processing process includes performing data analysis, data verification, data analysis on the power quality monitoring data, and storing the analyzed data information; optionally, a human-computer interaction design can be performed through the function of the database, and background monitoring personnel can analyze and check the power quality state of the photovoltaic power generation system through a database visual interface.
The scheduling monitoring center 404 may be in communication connection with the monitoring background 403 in an ethernet, GPRS/3G/4G/5G communication manner, and receive data information sent by the monitoring background 403. Optionally, the dispatching monitoring center 404 may further analyze and check the power quality status of the photovoltaic power generation system by accessing the database visualization interface. Optionally, the dispatch monitoring center 404 is a terminal device, and includes at least one of a computer, a smart phone, and a desktop computer, which is not limited herein.
Correspondingly, the invention also provides a ZigBee-based photovoltaic power generation electric energy quality monitoring method, which comprises the following steps:
s502, collecting power quality monitoring data;
s504, sending the power quality monitoring data to the ZigBee coordinator through a routing device;
s506, the ZigBee coordinator receives the power quality monitoring data, then carries out aggregation and framing, and sends the power quality monitoring data to a monitoring background;
s508, the monitoring background receives the power quality monitoring data, performs data analysis, data verification and data analysis, and stores analyzed data information;
and S510, the monitoring background sends the analyzed data information to a dispatching monitoring center.
Before the ZigBee coordinator receives the power quality monitoring data and then performs aggregation and framing in step S506, the method further includes the steps of:
and monitoring whether the received power quality monitoring data is correct or not, and if not, re-receiving the power quality monitoring data.
Fig. 6 shows a photovoltaic power generation power quality monitoring system based on carrier communication. The monitoring system includes: the system comprises acquisition terminal equipment 601, an N-side carrier machine 602, an N-side coupler 603, an M-side carrier machine 604, an M-side coupler 605, a carrier communication manager 606 and a monitoring master station 607. The acquisition terminal device 601 is installed along with inverters of each photovoltaic array and used for acquiring power quality monitoring data and sending the monitoring data to the N-side carrier machine 602 in a wired communication mode, and as carrier communication uses a power line as a transmission medium, but multiplex communication on the power line is different from a common communication line, optimal carrier signal transmission efficiency is obtained, interference is avoided, the problem of connection between the power line and the carrier device is solved, and therefore a coupler is needed to solve the problems of carrier signal transmission efficiency and interference. The power quality monitoring data is transmitted to the carrier communication manager 606 through the N-side carrier machine 602, the N-side coupler 603, the M-side carrier machine 604, and the M-side coupler 605, and the monitoring master station 607 receives, analyzes, and processes the power quality monitoring data.
The power line carrier communication uses the power line as a transmission medium, so that a wiring link is omitted, the photovoltaic power station electric energy quality acquisition terminal equipment is respectively installed at an inverter and is boosted to be combined with 35kV, the monitoring main station is generally arranged at a 110kV transformer substation, 35kV lines are communicated between two places, the lines are very reliable communication routes, rewiring is not needed, special maintenance is not needed, theoretically, carrier communication can be completely adopted, but some defects exist, the mode of the power line carrier communication is limited by available frequency spectrum, communication interruption can occur during the maintenance and grounding of a power transmission line, the influence of system short circuit grounding fault is large, the anti-interference performance is slightly poor, and therefore the monitoring task of the photovoltaic power station is not facilitated.
In a comprehensive way, the ZigBee communication technology is more suitable for monitoring tasks of photovoltaic power stations.
The technical features of the embodiments described above may be arbitrarily combined, and for the sake of brevity, all possible combinations of the technical features in the embodiments described above are not described, but should be considered as being within the scope of the present specification as long as there is no contradiction between the combinations of the technical features.
The above-mentioned embodiments only express several embodiments of the present invention, and the description thereof is more specific and detailed, but not construed as limiting the scope of the invention. It should be noted that, for a person skilled in the art, several variations and modifications can be made without departing from the inventive concept, which falls within the scope of the present invention. Therefore, the protection scope of the present patent shall be subject to the appended claims.
Claims (10)
1. The utility model provides a photovoltaic power generation electric energy quality monitoring system based on zigBee which characterized in that includes:
the acquisition terminal equipment is used for acquiring power quality monitoring data and sending the power quality monitoring data to the ZigBee coordinator;
the routing equipment is used for carrying out communication of signal relay among the acquisition terminal equipment and between the acquisition terminal equipment and the ZigBee coordinator;
the ZigBee coordinator is used for receiving the power quality monitoring data sent by the routing equipment, and comprises:
the processor module is used for carrying out aggregation and framing on the electric energy quality monitoring data;
the power supply module supplies power in a sleep mode;
the communication module is used for communication connection between the routing equipment and the ZigBee coordinator and between the ZigBee coordinator and the monitoring background;
the monitoring background is used for receiving the power quality monitoring data sent by the ZigBee coordinator and analyzing and processing the power quality monitoring data;
the acquisition terminal equipment, the routing equipment and the ZigBee coordinator adopt a mesh topology structure to carry out wireless networking.
2. The ZigBee-based photovoltaic power generation power quality monitoring system as claimed in claim 1, wherein the collection terminal device is installed on an inverter of a photovoltaic array and is used for collecting sampling point data transmitted by the inverter.
3. The ZigBee-based photovoltaic power generation power quality monitoring system according to claim 1, wherein the acquisition terminal device has a routing function.
4. The ZigBee-based photovoltaic power generation power quality monitoring system according to claim 1, wherein the mesh topology comprises:
the ZigBee coordinator node is used as a main control node of the network and is responsible for the establishment and maintenance functions of the network;
the routing equipment nodes are used for relaying and forwarding information and maintaining the normal state of the network;
and a plurality of acquisition equipment terminal nodes.
5. The ZigBee-based photovoltaic power generation power quality monitoring system according to claim 4,
the ZigBee coordinator node is in communication connection with the routing equipment node and the acquisition equipment terminal node;
the routing equipment node is in communication connection with the acquisition terminal equipment node;
the routing equipment nodes can be directly connected in a communication mode, and a multi-routing communication channel is constructed.
6. The ZigBee-based photovoltaic power generation power quality monitoring system as claimed in claim 5, wherein the devices with the routing function can be in communication connection with each other.
7. The ZigBee-based photovoltaic power generation power quality monitoring system according to claim 1, further comprising:
the dispatching monitoring center comprises at least one of a computer, a smart phone, a desktop computer and the like;
and the monitoring background is in communication connection with the dispatching monitoring center through at least one communication mode of Ethernet communication, GPRS, 3G, 4G and 5G, and sends the processed power quality monitoring data.
8. The ZigBee-based photovoltaic power generation power quality monitoring system according to claim 1,
the time for the ZigBee coordinator to enter the working mode from the sleep mode is 15 ms.
9. A ZigBee-based photovoltaic power generation electric energy quality monitoring method is characterized by comprising the following steps:
collecting power quality monitoring data;
sending the power quality monitoring data to the ZigBee coordinator through a routing device;
the ZigBee coordinator receives the power quality monitoring data, then carries out aggregation and framing and sends the power quality monitoring data to a monitoring background;
the monitoring background receives the power quality monitoring data, performs data analysis, data verification and data analysis, and stores analyzed data information;
and the monitoring background sends the analyzed data information to a dispatching monitoring center.
10. The ZigBee-based power quality monitoring method for photovoltaic power generation according to claim 9, wherein before the ZigBee coordinator receives the power quality monitoring data and performs aggregation and framing, the ZigBee coordinator further comprises:
and monitoring whether the received power quality monitoring data is correct or not, and if not, re-receiving the power quality monitoring data.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010945590.0A CN112235743A (en) | 2020-09-10 | 2020-09-10 | ZigBee-based photovoltaic power generation electric energy quality monitoring system and monitoring method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010945590.0A CN112235743A (en) | 2020-09-10 | 2020-09-10 | ZigBee-based photovoltaic power generation electric energy quality monitoring system and monitoring method |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN112235743A true CN112235743A (en) | 2021-01-15 |
Family
ID=74116135
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202010945590.0A Pending CN112235743A (en) | 2020-09-10 | 2020-09-10 | ZigBee-based photovoltaic power generation electric energy quality monitoring system and monitoring method |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN112235743A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115052025A (en) * | 2022-08-17 | 2022-09-13 | 广东邦盛新能源科技发展有限公司 | Intelligent networking method and device of photovoltaic panel data acquisition equipment |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103116346A (en) * | 2013-02-22 | 2013-05-22 | 西安众恒科技有限公司 | Power quality online monitoring system of network topology wireless communication |
| US20180167308A1 (en) * | 2016-03-14 | 2018-06-14 | State Grid Jiangsu Electric Power Company Nanjing Power Supply Company | Multimode Communication Method for Transmission Line Condition Monitoring |
-
2020
- 2020-09-10 CN CN202010945590.0A patent/CN112235743A/en active Pending
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103116346A (en) * | 2013-02-22 | 2013-05-22 | 西安众恒科技有限公司 | Power quality online monitoring system of network topology wireless communication |
| US20180167308A1 (en) * | 2016-03-14 | 2018-06-14 | State Grid Jiangsu Electric Power Company Nanjing Power Supply Company | Multimode Communication Method for Transmission Line Condition Monitoring |
Non-Patent Citations (1)
| Title |
|---|
| 宋池: "基于ZigBee的光伏发电电能质量监测系统", 《中国优秀硕士学位论文全文数据库工程科技II辑》, no. 3, pages 11 - 20 * |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115052025A (en) * | 2022-08-17 | 2022-09-13 | 广东邦盛新能源科技发展有限公司 | Intelligent networking method and device of photovoltaic panel data acquisition equipment |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| Talaat et al. | Hybrid-cloud-based data processing for power system monitoring in smart grids | |
| CN102818590A (en) | Wireless sensor network-based transmission lines icing on-line monitoring system | |
| CN109256854B (en) | Method for monitoring dispersed photovoltaic power station based on wireless communication | |
| CN204270126U (en) | A kind of family roof photovoltaic stratification management system | |
| CN104201672A (en) | Novel microgrid system control device | |
| CN102104350A (en) | Intelligent photovoltaic battery component | |
| CN205283154U (en) | Protection control of distributing type photovoltaic power generation and communication device | |
| CN112235743A (en) | ZigBee-based photovoltaic power generation electric energy quality monitoring system and monitoring method | |
| CN202160010U (en) | Power line monitoring device based on wireless network | |
| CN113608020A (en) | Remote electric energy monitoring control system | |
| CN208285279U (en) | A kind of header box acquisition and emitter based on NBIOT | |
| CN104242433A (en) | Energy management system for mixed energy source power station | |
| CN203644201U (en) | ZigBee-based substation information monitoring system | |
| CN217849380U (en) | Photovoltaic energy storage intelligent monitoring and management system | |
| CN202886508U (en) | Intelligent distribution network failure monitoring terminal | |
| CN110224440A (en) | A kind of photovoltaic module generated output optimization system with wireless self-networking function | |
| CN202661543U (en) | Electric energy information acquisition and transmission device supporting multiple communication modes | |
| CN105576828A (en) | Novel distribution network distributed fault monitoring system | |
| CN210404847U (en) | Power distribution network power consumption information acquisition and power distribution structure topology recognition system | |
| CN109286244A (en) | Photovoltaic electrification component based on carrier communication monitors system | |
| CN204575219U (en) | A kind of transformer station's In-Line Temperature Measure System based on 6LoWPAN | |
| CN210402688U (en) | Photovoltaic power station wireless data acquisition system | |
| CN204168235U (en) | With the concentrated inversion pressure swing type photovoltaic generation monitoring the complete sets of equipment of power detection | |
| CN211151617U (en) | Low-voltage distribution automation system | |
| CN114726086A (en) | Integrated management system for power monitoring and diagnosis of transformer area |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| RJ01 | Rejection of invention patent application after publication | ||
| RJ01 | Rejection of invention patent application after publication |
Application publication date: 20210115 |