CN115540939B - An intelligent monitoring system for flexible brackets in photovoltaic power stations - Google Patents

Abstract

The invention discloses a monitoring system for a flexible bracket of a photovoltaic power station, which includes: a stress sensor used to sense the stress of the flexible bracket of the photovoltaic power station; a displacement sensor used to sense the displacement of the flexible bracket of the photovoltaic power station; An inclination sensor is used to sense the inclination angle of the flexible support of the photovoltaic power station; a data collection and analysis module is used to collect and analyze the signals sensed by each sensor. The technical solution disclosed in the present invention enables workers to monitor various parameters of the flexible support structure connections of the photovoltaic power station in real time, so as to promptly understand the safety hazards of the photovoltaic flexible support and avoid unnecessary casualties and economic losses.

Description

An intelligent monitoring system for flexible brackets in photovoltaic power stations

Technical field

The invention belongs to the technical field of new energy sources for photovoltaic power generation, and in particular is an intelligent monitoring system for flexible supports of photovoltaic power stations.

Background technique

Photovoltaic power stations are installed in high places such as unobstructed wilderness, rooftops or uphill slopes where the sun's illumination is good. These occasions are places that are greatly affected by strong winds. Typhoons and earthquakes are also the biggest hidden dangers of damaging photovoltaic arrays. Wind pressure is proportional to the square of wind speed, and high-speed typhoons will produce huge wind pressure. The wind pressure on the windward side is integrated along the surface. The wind pressure on the large-area photovoltaic array is too great, making the module frame, fixed pressure plate and bracket unable to withstand it. Moreover, strong pulsating winds close to the natural vibration period of these structures will produce a resonance response, which can easily lead to the collapse of the entire set of mounting brackets.

The flexible support of the photovoltaic power station adopts a large-span multi-span structure. This type of structure tensions the prestressed steel wire rope between the fixed points at the end and middle sections. The end and middle foundations are set at appropriate locations and tightened. Prestressed steel strands, fixed points adopt rigid structures and outer cable-stayed steel strands provide support reaction force. Although the flexible support system has the advantages of large span and flexible and adjustable span range, due to the high height, large span and complex stress of the end and middle columns, a collapse will cause major personnel safety accidents and property losses.

In view of this, in order to avoid major personal safety accidents and property losses, and to enable the safe and economical operation of photovoltaic power stations using flexible brackets, how to monitor the flexible brackets of photovoltaic power stations in a targeted manner has become an urgent technical problem that needs to be solved in this field.

Contents of the invention

In order to solve the above technical problems, the present invention provides a monitoring system for a flexible bracket of a photovoltaic power station, including:

A stress sensor used to sense the stress of the flexible bracket of the photovoltaic power station;

A displacement sensor used to sense the displacement of the flexible bracket of the photovoltaic power station;

An inclination sensor for sensing the inclination angle of the flexible support of the photovoltaic power station;

The data collection and analysis module is used to collect and analyze the signals sensed by each sensor.

Preferably,

The monitoring system also includes a communication module for sending signals sensed by each sensor to other receiving devices in the control room or outside the control room.

Preferably,

The data acquisition and analysis module is also used to analyze the signals sensed by each sensor and determine whether any signal exceeds the first threshold of the early warning.

Preferably,

The data acquisition and analysis module is also used to analyze the signals sensed by each sensor and determine whether any signal exceeds the second alarm threshold.

Preferably,

The monitoring system also includes an early warning prompt module, which is used to: when the data collection and analysis module determines that a certain signal exceeds the first warning threshold, send early warning prompt information to the staff through the host in the control room, or through the control room outside the control room. Other receiving devices send early warning messages to staff.

Preferably,

The monitoring system also includes an alarm module, which is used to: when the data collection and analysis module determines that a certain signal exceeds the second alarm threshold, send an audible and visual alarm message to the staff through the host in the control room, or through the control room outside the control room. Other receiving devices send out audible and visual alarm messages to staff.

Preferably,

The signals sensed by each sensor include: the pull-out force and displacement signals of the anchor rod.

Preferably,

The signals sensed by each sensor include: basic stress signals at the middle or end portions.

Preferably,

The signals sensed by each sensor include: structural angle signals of the flexible bracket.

Preferably,

The data collection and analysis module is also used to determine whether an early warning prompt or audible and visual alarm is needed based on historical monitoring data and the current sensing signals of each sensor.

Compared with the prior art, the present invention has the following advantages:

The technical solution disclosed in the present invention enables workers to monitor various parameters of the flexible support structure connections of the photovoltaic power station in real time, so as to promptly understand the safety hazards of the photovoltaic flexible support and avoid unnecessary casualties and economic losses.

Description of the drawings

The accompanying drawings illustrate exemplary embodiments of the invention and together with the description serve to explain the principles of the invention, and are included to provide a further understanding of the invention, and are incorporated in and constitute part of this specification. part of the instructions;

Figure 1 is a schematic structural diagram of a monitoring system in one embodiment of the present invention;

Figures 2A, 3A, 4A, and 5A are schematic diagrams of the layout of various sensors at different monitoring points in multiple embodiments of the present invention;

Figures 2B, 3B, 4B, and 5B are schematic diagrams corresponding to the facade distribution of various sensors at corresponding monitoring points in Figures 2A, 3A, 4A, and 5A;

Figures 6A and 6B are schematic top views and isometric views of a pentagonal pyramid in one embodiment of the present invention;

Figure 7 is a schematic diagram of the lateral arrangement of the intermediate bracket in one embodiment of the present invention, in which the intermediate bracket exemplarily uses a 400mm PHC pipe column.

Detailed ways

The present invention will be further described in detail below with reference to the accompanying drawings 1 to 7 and the embodiments. It can be understood that the specific embodiments described here are only used to explain the relevant content, but are not intended to limit the present invention. In addition, it should be noted that, for convenience of description, only the parts related to the present invention are shown in the drawings.

It should be noted that, as long as there is no conflict, the embodiments and features of the embodiments of the present invention can be combined with each other. The technical solution of the present invention will be described in detail below with reference to the accompanying drawings and embodiments.

Unless otherwise specified, the illustrated exemplary embodiments/examples are to be understood as exemplary features providing various details of some manner in which the technical concept of the present invention may be implemented in practice. Therefore, unless otherwise stated, features of various embodiments/embodiments may be additionally combined, separated, interchanged and/or rearranged without departing from the technical concept of the present invention.

The possible use of cross-hatching and/or shading in the drawings is generally used to make boundaries between adjacent features clear. As such, unless stated otherwise, the presence or absence of cross-hatching or shading does not convey or indicate any knowledge of the specific materials, material properties, dimensions, proportions, commonalities between the components shown and/or any other characteristics of the components, Any preferences or requirements for attributes, properties, etc. Furthermore, in the drawings, the size and relative sizes of components may be exaggerated for clarity and/or descriptive purposes. While example embodiments may be implemented differently, a specific process sequence may be performed in a different order of steps than that described. For example, two consecutively described processes may be performed substantially concurrently or in the reverse order of that described. In addition, the same reference numerals represent the same components.

When an element is referred to as being "on," "on," "connected to" or "coupled to" another element, it can be directly on, directly connected to, or directly connected to the other element. Either directly coupled to said other component, or intervening components may be present. However, when an element is referred to as being "directly on," "directly connected to" or "directly coupled to" another element, there are no intervening elements present. For this purpose, the term "connected" may refer to a physical connection, an electrical connection, etc., with or without intervening components.

For descriptive purposes, the invention may use terms such as “under,” “under,” “under,” “under,” “under,” Spatially relative terms for "above," "on," "on," "higher," and "side (for example, as in "side wall" , thereby describing the relationship between one component and another (other) component as shown in the drawings. In addition to the orientation depicted in the figures, spatially relative terms are intended to encompass various orientations of the device in use, operation, and/or manufacture. For example, if the device in the figures is turned over, elements described as "below" or "beneath" other elements or features would then be oriented "above" the other elements or features. Thus, the exemplary term "below" may encompass both orientations "above" and "below." Furthermore, the device may be otherwise oriented (e.g., rotated 90 degrees or at other orientations) and the spatially relative descriptors used herein interpreted accordingly.

The terminology used herein is for the purpose of describing particular embodiments and is not intended to be limiting. As used herein, the singular forms "a," "an," and "the" are intended to include the plural forms as well, unless the context clearly indicates otherwise. Furthermore, when the terms "comprises" and/or "includes" and variations thereof are used in this specification, it is stated that the stated features, integers, steps, operations, parts, components and/or groups thereof are present but not excluded. One or more other features, integers, steps, operations, parts, components and/or groups thereof are present or appended. It is also noted that, as used herein, the terms "substantially," "approximately," and other similar terms are used as terms of approximation and not as terms of degree, and as such, they are used to explain what one of ordinary skill in the art would recognize. Inherent deviations from measured, calculated and/or supplied values.

In one embodiment, the present invention discloses a monitoring system for a flexible bracket of a photovoltaic power station, including:

A stress sensor used to sense the stress of the flexible bracket of the photovoltaic power station;

A displacement sensor used to sense the displacement of the flexible bracket of the photovoltaic power station;

An inclination sensor for sensing the inclination angle of the flexible support of the photovoltaic power station;

The data collection and analysis module is used to collect and analyze the signals sensed by each sensor.

Regarding the above embodiments, the technical solution disclosed enables the staff to monitor various parameters of the flexible support structure connection of the photovoltaic power station in real time, so as to promptly understand the safety hazards of the photovoltaic flexible support and avoid unnecessary casualties and economic losses.

In one embodiment,

The monitoring system also includes a communication module for sending signals sensed by each sensor to other receiving devices in the control room or outside the control room.

In one embodiment,

The communication module is, for example: a wireless transmission terminal receiver.

In one embodiment,

The data acquisition and analysis module is also used to analyze the signals sensed by each sensor and determine whether any signal exceeds the first threshold of the early warning.

In one embodiment,

The data acquisition and analysis module is also used to analyze the signals sensed by each sensor and determine whether any signal exceeds the second alarm threshold.

In one embodiment,

The monitoring system also includes an early warning prompt module, which is used to: when the data collection and analysis module determines that a certain signal exceeds the first warning threshold, send early warning prompt information to the staff through the host in the control room, or through the control room outside the control room. Other receiving devices send early warning messages to staff.

In one embodiment,

The monitoring system also includes an alarm module, which is used to: when the data collection and analysis module determines that a certain signal exceeds the second alarm threshold, send an audible and visual alarm message to the staff through the host in the control room, or through the control room outside the control room. Other receiving devices send out audible and visual alarm messages to staff.

In one embodiment,

The signals sensed by each sensor include: the pull-out force and displacement signals of the anchor rod.

Preferably,

The signals sensed by each sensor include: stress signals of the upper and lower cables.

In one embodiment,

The signals sensed by each sensor include: structural angle signals of the flexible bracket.

In one embodiment,

The data collection and analysis module is also used to determine whether an early warning prompt or audible and visual alarm is needed based on historical monitoring data and the current sensing signals of each sensor.

In one embodiment,

In addition to determining whether any signal exceeds the first threshold of warning or the second threshold of alarm, the data acquisition and analysis module can also convert the signals sensed by each sensor into digital signals and use at least part of the digital signals to , after data processing, at least one new output is obtained, and it is judged whether the output exceeds the corresponding threshold of the early warning or the corresponding threshold of the alarm, so as to determine whether an early warning prompt or a sound and light alarm is needed.

In one embodiment,

The monitoring system of the flexible bracket of the photovoltaic power station has become an intelligent monitoring system due to its data collection and analysis module capabilities. This intelligent monitoring system can include various high-precision displacement sensors, stress sensors, inclination sensors, and wireless transmission terminal signal reception device, data acquisition and analysis module, display host and sound and light alarm, among which the display host can be used for early warning prompts. It can be understood that the higher the accuracy of the sensor, the more conducive it is to monitoring, but a balance between cost and accuracy can be considered during actual deployment.

In one embodiment, referring to Figure 1,

The anchor pullout force, upper and lower cable stress, and flexible support structure angle data are collected through displacement sensors, stress sensors, and inclination sensors and are wirelessly transmitted to the terminal database for analysis. The data collection and analysis module can be a central processing unit (CPU). unit), general-purpose processor, co-processor, digital signal processor (DSP), application-specific integrated circuit (ASIC), field programmable gate array (FPGA, field programmable gate array) or others Programmable logic devices, transistor logic devices, hardware components, or any combination thereof. The data acquisition and analysis module can also be a combination that implements computing functions, such as a combination of one or more microprocessors, a combination of DSP and microprocessors, and so on.

In Figure 1, the wireless transmission terminal receiver is used to perform the receiving function: acquiring anchor pullout force, upper and lower cable stress, and flexible bracket structure angle data through each sensor. In another embodiment, the deformation data of the upper and lower cables can be further obtained through corresponding sensors.

In an implementable manner, the above-mentioned data collection and analysis module is not only used to obtain the above-mentioned data information, but also uses the determined data information as historical monitoring data; and combines the extracted real-time monitoring data information with the historical monitoring data in the database. For comparison and further calibration:

Construct a mapping between data value intervals and warning threshold intervals for different data attributes to form a comparative data information database;

Set the preset sampling time interval for collecting real-time monitoring data of the anchor pull-out force, upper and lower cable stress, deformation, and flexible support structure angle of the flexible support system;

When the data values of all data attributes in the data information database fall into the corresponding data value interval in the database, it is judged whether the monitoring data sampled within the sampling time interval falls within the early warning threshold interval mapped to the data value interval; if the judgment is no If the monitoring data is less than or equal to 80% of the total sampling monitoring data, the flexible support system will give a fault alarm.

For example, the alarm thresholds of monitoring data are as follows:

Alarm threshold of anchor pull-out force: When the anchor pull-out force monitoring value exceeds 25% of the initial pull-out force, the system automatically issues an early warning alarm; when it exceeds 50% of the initial pull-out force, the system automatically issues a danger alarm;

The alarm thresholds for the stress and deformation of the upper and lower cables include the thresholds for the allowable strength of the cable material and the thresholds for the vertical and horizontal deformation of the cables:

When the cable stress monitoring value exceeds 80% of the maximum allowable strength value of the cable material, for example, 1056MPa, the system automatically issues an alarm; when it reaches 100% of the maximum allowable strength value of the cable material, such as 1320MPa, the system automatically issues a danger alarm;

Alarm threshold for the deformation of the upper and lower cables: when the cable deformation value exceeds 1/60 of the span of the bracket, the system issues an early warning alarm; when the value of the cable deformation exceeds 1/30 of the span of the bracket, the system issues a danger alarm;

Flexible support structure angle alarm threshold: The system issues an early warning alarm when the angle of the cable structure exceeds 3 degrees, and issues a danger alarm when it exceeds 5 degrees.

In the following embodiments combined with the corresponding drawings, the layout of the monitoring points of various sensors is as follows:

See Figure 2A, Figure 2B, Figure 5A, Figure 5B,

At any end bracket, there are: ground anchor deformation and stress measuring points, cable stress measuring points for the upper or lower prestressed cables, and cable inclination angle measuring points.

See Figure 3A, Figure 3B, Figure 4A, Figure 4B,

At the pentagonal pyramid between any end bracket and the intermediate bracket closest to the end bracket, there are arranged: amplitude and displacement measuring points for the upper or lower prestressed cables, and:

Near the end bracket, there are also arranged: amplitude and displacement measuring points for the upper or lower prestressed cables.

At the pentagonal pyramid between any two adjacent intermediate brackets, there are: amplitude and displacement measuring points for the upper or lower prestressed cables, and:

Near one of the middle brackets, there are also: amplitude and displacement measuring points for the upper or lower prestressed cables, and additionally arranged at the middle bracket: cable stress measuring points for the upper or lower prestressed cables, and the inclination angle. Measuring point.

It should be noted that the upper and lower prestressed cables are in upper and lower spatial positions and are connected through a pentagonal pyramid. The objects measured by the amplitude and displacement measuring points are prestressed cables. In each of the figures shown in Figures 2A to 5B, the arrangement of measuring points at the ends or the middle can realize the sensing of the foundation stress at the middle and ends. Further, Figures 6A and 6B illustrate the top view and isometric view of the pentagonal pyramid respectively; Figure 7 illustrates the lateral arrangement of the middle bracket.

All in all, the present invention discloses an intelligent monitoring system for flexible brackets of photovoltaic power stations. It monitors the displacement, stress, angle and other parameters of the connection in real time on the flexible bracket structure, converts the physical signals into electrical signals and then sends them through the wireless network. Provide background monitoring, so that operators or other staff can monitor the parameters of the flexible support structure connection of the photovoltaic power station in real time, so as to understand the safety hazards of the photovoltaic flexible support in a timely manner and avoid unnecessary casualties and economic losses. This fully demonstrates that this system is necessary and practical for the safe and economical operation of photovoltaic power stations using flexible brackets.

In the description of this specification, reference to the description of the terms "one embodiment/way", "some embodiments/way", "example", "specific example", or "some examples" etc. is meant to be in conjunction with the description of the embodiment/way. or examples describe specific features, structures, materials, or characteristics that are included in at least one embodiment/mode or example of the present application. In this specification, the schematic expressions of the above terms do not necessarily refer to the same embodiment/mode or example. Furthermore, the specific features, structures, materials or characteristics described may be combined in any suitable manner in any one or more embodiments/modes or examples. Furthermore, those skilled in the art may combine and combine the different embodiments/ways or examples and the features of different embodiments/ways or examples described in this specification unless they are inconsistent with each other.

In addition, the terms “first” and “second” are used for descriptive purposes only and cannot be understood as indicating or implying relative importance or implicitly indicating the quantity of indicated technical features. Therefore, features defined as "first" and "second" may explicitly or implicitly include at least one of these features. In the description of this application, "plurality" means at least two, such as two, three, etc., unless otherwise expressly and specifically limited.

Those skilled in the art should understand that the above-mentioned embodiments are only for clearly explaining the present invention, but are not intended to limit the scope of the present invention. For those skilled in the art, other changes or modifications can be made based on the above disclosure, and these changes or modifications are still within the scope of the present invention.

Claims (4)

1. A monitoring system for a photovoltaic power plant flexible support, comprising:

a stress sensor for sensing stress of the photovoltaic power plant flexible support;

a displacement sensor for sensing displacement of the photovoltaic power plant flexible support;

the inclination angle sensor is used for sensing the inclination angle of the photovoltaic power station flexible support;

the data acquisition and analysis module is used for acquiring and analyzing signals sensed by the sensors;

the monitoring system also comprises a communication module, a control room and a control room, wherein the communication module is used for sending signals sensed by the sensors to the control room;

the data acquisition and analysis module is also used for analyzing based on the signals sensed by the sensors and judging whether any signal exceeds a first threshold value of early warning;

the data acquisition and analysis module is also used for analyzing based on the signals sensed by the sensors and judging whether any signal exceeds a second alarm threshold;

wherein,

at either end bracket, there is arranged: ground anchor deformation, stress measurement point, and: cable stress measuring point of upper layer or lower layer prestress cable and cable dip angle measuring point;

at the pentagonal cone between either end bracket and the intermediate bracket nearest to the end bracket, there are arranged: amplitude and displacement measuring points of the upper layer or the lower layer of prestress ropes are aimed at, and:

near the end bracket, there is also arranged: measuring points for amplitude and displacement of an upper layer or a lower layer of prestressed cable;

at the pentagonal cone between any two adjacent intermediate brackets, there are arranged: amplitude and displacement measuring points of the upper layer or the lower layer of prestress ropes are aimed at, and:

near one of the intermediate brackets, there is also arranged: the amplitude and displacement measuring points for the upper layer or the lower layer of the prestressed cable and the position of the middle bracket are additionally provided with: a cable stress measuring point of the upper layer or the lower layer of the prestressed cable and an inclination measuring point; the upper layer and the lower layer of the pre-stress cables are positioned at upper and lower space positions, and the objects measured by the amplitude and displacement measuring points are pre-stress cables through pentagonal cone connection; the arrangement of the measuring points at the end part or the middle part is used for realizing the sensing of the basic stress of the middle part and the end part;

the monitoring system also comprises a wireless transmission terminal receiver for executing the receiving function: acquiring pulling resistance of the anchor rod, upper and lower layer cable stress and angle data of the flexible support structure through each sensor; further acquiring deformation data of the upper and lower cables through corresponding sensors;

the data acquisition and analysis module is used for acquiring data information and taking the determined data information as historical monitoring data; and comparing the extracted real-time monitored data information with historical monitoring data in a database and further calibrating:

constructing the mapping between the data value intervals and the early warning threshold intervals of different data attributes to form a comparison data information database;

setting a sampling time interval preset by acquiring real-time monitoring data of the pulling resistance, the stress and the deformation of upper and lower layers of ropes of an anchor rod of a flexible support system and the angle of a flexible support structure;

when the data values of all data attributes of the comparison data information database fall into the corresponding data value intervals in the database, judging whether the monitoring data sampled in the sampling time interval fall into an early warning threshold value interval mapped with the data value intervals or not; if the monitoring data is not more than 80% of the total sampling monitoring data, the flexible support system is in fault alarm;

the alarm threshold of the monitoring data is as follows:

alarm threshold for anchor rod pullout resistance: when the monitored value of the pulling force of the anchor rod exceeds 25% of the initial pulling force, the system automatically gives out an early warning alarm, and when the monitored value of the pulling force of the anchor rod exceeds 50% of the initial pulling force, the system automatically gives out a dangerous alarm;

the alarm threshold values of the stress and deformation of the upper and lower layers of ropes comprise the threshold value of the allowable strength of the rope material and the threshold value of the vertical and horizontal deformation of the rope:

the system automatically gives an alarm when the cable stress monitoring value exceeds 80% of the allowable maximum strength value of the cable material, and automatically gives a dangerous alarm when the cable material reaches 100% of the allowable maximum strength value;

alarm threshold for deformation of upper and lower cables: the system gives out an early warning alarm when the cable deformation value exceeds 1/60 of the span of the bracket, and gives out a dangerous alarm when the cable deformation value exceeds 1/30 of the span of the bracket;

flexible support structure angle alarm threshold: and when the angle change value of the rope structure exceeds 3 degrees, the system gives out an early warning alarm, and when the angle change value exceeds 5 degrees, the system gives out a dangerous alarm.

2. The monitoring system of claim 1, wherein the monitoring system is configured to monitor the status of the monitoring system,

the monitoring system also comprises an early warning prompt module which is used for: when the data acquisition and analysis module judges that a certain signal exceeds a first early warning threshold value, an early warning prompt message is sent to a worker through a host computer of the control room.

3. The monitoring system of claim 1, wherein the monitoring system is configured to monitor the status of the monitoring system,

the monitoring system also comprises an alarm module for: and when the data acquisition and analysis module judges that a certain signal exceeds a second alarm threshold, sending audible and visual alarm information to staff through a host computer of the control room.

4. The monitoring system of claim 1, wherein the monitoring system is configured to monitor the status of the monitoring system,

and the data acquisition and analysis module is also used for judging whether early warning prompt or audible and visual alarm is needed according to the historical monitoring data and the current sensing signals of the sensors.