CN-122028056-A - Heliostat wireless control system and method based on multiple frequency bands

CN122028056ACN 122028056 ACN122028056 ACN 122028056ACN-122028056-A

Abstract

The application discloses a heliostat wireless control system and method based on multiple frequency bands, wherein the system comprises an on-site layer, a convergence layer and an application layer, the on-site layer is the on-site control layer of the heliostat and comprises a communication gateway, an on-site controller and matched equipment thereof, the on-site layer is based on a cabling-free design, the communication gateway and the on-site controller are in communication connection through a wireless network, the convergence layer comprises a control center, a switch and a wireless management platform, the control center manages the communication gateway and distributes frequency bands for the communication gateway, a mirror field optical fiber ring network is accessed through the switch to communicate with a mirror field control system, and the application layer comprises a mirror field operator station, an engineer station, a mirror field control and scheduling system and bears data collection, display and scheduling of the whole mirror field control system. The application obviously reduces the cost of the mirror field in the aspects of power distribution equipment, cable purchase and construction.

Inventors

LI WEICHENG
DU XING
Jia Lurui
HE JUNREN
HE JIE
YE LIN
HUA WENHAN
YANG CHEN

Assignees

东方电气集团东方锅炉股份有限公司

Dates

Publication Date: 20260512
Application Date: 20260120

Claims (10)

1. The heliostat wireless control system based on the multiple frequency bands is characterized by comprising an in-situ layer, a convergence layer and an application layer; The local layer is the heliostat local control layer and comprises a communication gateway, a local controller and matched equipment thereof, wherein the local layer is based on a cableless design, and the communication gateway and the local controller are in communication connection by adopting a wireless network; the convergence layer comprises a control center, a switch and a wireless management platform, wherein the control center manages a communication gateway and distributes frequency bands for the communication gateway, and the communication gateway is connected with a mirror field optical fiber ring network through the switch to communicate with a mirror field control system; The application layer comprises a field operator station, an engineer station and a field control and scheduling system, and is used for carrying out data collection, display and scheduling of the whole field control system.
2. The wireless control system of heliostat based on multiple frequency bands of claim 1, wherein the communication gateway is internally provided with communication management, local controller management and system management, and is configured with a plurality of wireless communication modules for managing a plurality of local controllers and completing data transmission with a control center, and for performing status monitoring, data issuing and uploading on the plurality of local controllers; When the communication of the communication module working in the main working frequency band is abnormal, the communication gateway negotiates with the control center, and uses the idle standby working frequency band for data transmission, thereby ensuring the communication stability; the communication gateway adopts a wireless communication module to realize communication connection with the convergence layer control center, or directly accesses the convergence layer ring network through an Ethernet interface to carry out communication and data transmission with the upper computer.
3. The wireless control system of the heliostat based on the multiple frequency bands, which is disclosed in claim 1, is characterized in that the local controller and matched equipment thereof comprise a local controller, a driver, an actuator, a photovoltaic module, a storage battery and a photovoltaic controller, wherein the local controller is internally provided with a sun tracking algorithm and a heliostat control algorithm, the driver is used for distributing and controlling the actuator, the actuator is used for acting as required to adjust the mirror gesture of the heliostat, the photovoltaic module is a solar photovoltaic panel and is used for converting solar energy into direct current electric energy, the storage battery is used for storing surplus electric energy and providing stable electric power output, the storage battery and the photovoltaic panel are used for providing a dual-channel power supply mode together, and the photovoltaic controller is used for realizing management and optimal control of the photovoltaic module, the storage battery and the load in view of distribution.
4. The wireless control system of the heliostat based on the multiple frequency bands according to claim 1, wherein the local controller is provided with a plurality of wireless communication modules which are respectively responsible for a communication verification function, a main working function, a redundant backup function and a maintenance function, wherein the communication verification function is used for carrying out identity authentication with a communication gateway, the main working function is used for starting communication with the communication gateway after the communication verification module completes the identity authentication, the redundant backup function is used for starting working when the main module works abnormally and the packet loss rate exceeds a preset value, and the maintenance function is used for carrying out communication connection between a designated communication module and heliostat debugging software so as to realize convenient debugging and maintenance; The main module and the redundant backup module respectively work in different frequency bands, when the communication of the main module is abnormal, the local controller negotiates with the communication gateway, and the idle redundant backup working frequency band is used for data transmission, so that the communication stability is ensured.
5. The wireless control system of the heliostat based on the multiple frequency bands according to claim 1, wherein a plurality of wireless communication modules configured by the local controller work in different wireless frequency bands to avoid co-channel interference, an encryption chip is arranged in the controller to support a plurality of encryption algorithms, the drivers are independently arranged and are in communication connection with the local controller in a wired or wireless mode, or a highly integrated design is realized with the local controller, and the drivers have the functions of acquiring and feeding back power of the executor.
6. The wireless control system of heliostat based on multiple frequency bands according to claim 1, wherein the photovoltaic controller has a power generation collection function of a photovoltaic module, is in communication connection with a driver to obtain the power consumption requirement of heliostat movement in real time, and controls the charge and discharge modes of a storage battery; The photovoltaic controller has a mixed discharge management function, can assist the combined power supply of the photovoltaic panel and the storage battery, enables the combined power supply to be realized based on a dual-channel load power supply mode of the photovoltaic panel and the storage battery, reduces the requirements on the power of the photovoltaic panel and the capacity of the battery, preferentially uses photovoltaic electric energy to supply power and stores surplus energy into the storage battery when the output power of the photovoltaic panel is larger than the load requirement, automatically starts the storage battery to discharge when the output power of the photovoltaic panel does not meet the requirement, synchronously outputs the storage battery and the photovoltaic panel and jointly meets the load requirement, and switches to a battery independent power supply mode when the output of the photovoltaic panel does not meet the requirement so as to meet the standby cleaning and restarting electric quantity requirements of the heliostat; The photovoltaic controller is internally provided with a short-distance wireless communication module, so that the quick connection of the mobile equipment of maintenance personnel is conveniently realized, and the on-site side later-period overhaul and maintenance are completed.
7. The wireless heliostat control system based on multiple frequency bands according to claim 1, wherein the wireless management platform is used for managing wireless communication frequency bands of the local controller and the local gateway, monitoring wireless communication quality of the local controller, the local gateway and the control center in real time, and performing whitelist management on the control center, the local gateway and the local controller; The wireless management platform allocates frequency points for each control center, communication gateway and local controller with independent ID, detects relevant data of the communication network to complete wireless communication quality monitoring, the communication equipment can communicate only when the wireless communication platform registers and obtains permission to realize a white list management function, and the relevant data comprises signal strength, signal-to-noise ratio, channel occupancy rate, carrier sense conflict times, protocol packet loss rate and throughput.
8. A multi-band-based wireless heliostat control method suitable for the multi-band-based wireless heliostat control method of any one of claims 1-7, comprising: Step 1, a communication gateway or an on-site controller finishes heliostat data uploading through a frequency point of a main module; Step 2, the wireless management platform monitors the channel state, acquires relevant parameters of a transmission channel, calculates channel gain according to channel response frequency and noise power when the local controller uploads data, compares the product of the channel transmission power and the channel gain with a preset signal-to-noise ratio threshold value, and if the product of the channel transmission power and the channel gain is smaller than the preset signal-to-noise ratio threshold value, the packet is regarded as lost, otherwise, the packet is regarded as not lost; step 3, comparing the data packet loss rate with a preset ratio, or judging whether the current channel is reliable based on the specific index requirement of the control system data communication quality of service (QoS) requirement, if not, negotiating with a main and standby communication module in a communication gateway or an on-site controller by a wireless management platform, switching to a frequency band where the standby module is positioned to finish data packet transmission in the current time period, namely finishing heliostat data uploading by the communication gateway or the on-site controller through a frequency point where the standby module is positioned; and 4, repeating the step 2 and the step 3 until all the data packets are transmitted.
9. The multi-band based heliostat wireless control method of claim 8, wherein in step 2, the first The data packet is at the primary module frequency point The channel gain at the time of the secondary transmission is: (1) Wherein, the Representing the number of transmissions per packet, Is the first Data packet number The channel frequency response at the time of the secondary transmission, In order for the noise power to be high, Representing the working frequency point of the current communication module, and taking the value according to the actual transmission condition; Judgment of the first Whether each data packet is lost is expressed as: (2) Wherein, the In order to indicate the variable(s), Indicating that packet loss occurs, otherwise, not losing the packet; And (4) representing a preset signal-to-noise ratio threshold, if the product of the channel transmission power and the channel gain is smaller than the preset signal-to-noise ratio threshold, packet loss occurs, and p is the transmission power.
10. The multi-band based heliostat wireless control method of claim 9, wherein in step 3, the third step The packet loss rate of the data is as follows: (3) wherein I is the total number of data.

Description

Heliostat wireless control system and method based on multiple frequency bands Technical Field The application relates to the technical field of solar photo-thermal utilization, in particular to a heliostat wireless control system and method based on multiple frequency bands. Background In the concentrating and heat collecting system, the mirror field communication network is equivalent to the nerve of the whole control system, the effective transmission of heliostat state information, upper control instructions and other important data is realized between the upper control system and the heliostat controller, and the network quality is closely related to the operation efficiency and safety of the whole system. At present, the domestic optothermal eyepiece fields all adopt wired communication networks such as industrial Ethernet or industrial RS-485 bus and the like to ensure high-speed and reliable transmission of data. However, the following limitations exist for large-scale engineering applications of conventional wired communication networking. Firstly, the traditional wired communication networking mode and the matched centralized power supply scheme thereof have higher implementation cost, mainly comprise initial construction cost (related to land excavation, long-distance laying and complex wiring) and high material cost (comprising a large number of cables and network switches), secondly, after the construction of a mirror field and the cable laying work are completed, the replacement of local damaged cables or the adjustment of network topology can cause higher maintenance cost, which is not beneficial to the maintenance and optimization upgrading of a network structure, and in addition, the debugging work of a wired control system can have development conditions after the whole-field construction work is completed, so that the construction period of the whole power station is prolonged. In view of the above limitations, the photo-thermal field has gradually begun to explore the possibilities of wireless communication networking application in the field control system. The wireless communication networking has the characteristics of flexible networking and the like, is hopeful to replace the traditional wired communication network, and provides a networking solution with less cables for the mirror field. However, the wireless communication networking still faces the following technical challenges in engineering application, namely firstly, wireless communication is easily influenced by complex electromagnetic environment, multipath effect and common-frequency interference, so that signal attenuation or packet loss is caused, in addition, once a communication frequency band is blocked or equipment is failed, systematic communication interruption is possibly caused, real-time performance and stability of mirror field control are threatened, secondly, the wireless networking can furthest realize economical advantages of cable reduction only by adopting a wireless power distribution scheme synchronously, and the photovoltaic panel efficiency, the battery capacity and the service life of the photovoltaic panel are all required to be higher by adopting a photovoltaic +battery distributed power distribution scheme with higher application rate, so that project investment cost pressure is further increased. Disclosure of Invention In view of the above, the present application provides a wireless heliostat control system and method based on multiple frequency bands. The application discloses a heliostat wireless control system based on multiple frequency bands, which comprises an in-situ layer, a convergence layer and an application layer; The local layer is the heliostat local control layer and comprises a communication gateway, a local controller and matched equipment thereof, wherein the local layer is based on a cableless design, and the communication gateway and the local controller are in communication connection by adopting a wireless network; the convergence layer comprises a control center, a switch and a wireless management platform, wherein the control center manages a communication gateway and distributes frequency bands for the communication gateway, and the communication gateway is connected with a mirror field optical fiber ring network through the switch to communicate with a mirror field control system; The application layer comprises a field operator station, an engineer station and a field control and scheduling system, and is used for carrying out data collection, display and scheduling of the whole field control system. Further, the communication gateway is internally provided with communication management, local controller management and system management, and is provided with a plurality of wireless communication modules for managing a plurality of local controllers and completing data transmission with a control center, and the wireless communication modules are used for carrying out