CN111207525A - Intermittent driving method and device for heat collecting groove of groove type photo-thermal solar system - Google Patents

Abstract

The application provides a heat collection groove intermittent driving method and a control device, and an operation control method and a control device of a groove type photo-thermal solar system. Wherein, the intermittent driving method of the heat collecting tank comprises the following steps: acquiring a target tracking angle; determining a real-time tracking angle, a stage steering angle, a limit tracking angle, a dead zone angle and a lag angle; respectively calculating angle difference values of the real-time tracking angle, the target tracking angle and the stage steering angle; obtaining judgment results according to the relationship between the angle difference value and the dead zone angle and the hysteresis angle respectively; and intermittently driving the heat collecting groove to rotate in stages according to the judgment result. By cooperatively considering the dead zone angle and the hysteresis angle, the heat collecting tank frequently rotates and shakes in the driving process, so that the energy consumption is reduced, and the control stability of the heat collecting tank is improved.

Description

Intermittent driving method and device for heat collecting groove of groove type photo-thermal solar system

Technical Field

The application belongs to the technical field of solar energy, and particularly relates to a heat collection groove driving method and device, and an operation control method and device of a groove type photo-thermal solar system.

Background

Solar energy is an inexhaustible clean pollution-free renewable energy source. Photothermal technology is an important form of utilizing solar energy and is under vigorous development. The photothermal technology is mainly divided into a photothermal power generation technology and a photothermal heat supply technology. The solar-thermal power generation technology collects solar heat energy by utilizing a large-scale array parabolic or dish-shaped mirror surface, generates steam through a heat exchanger, and combines the traditional turbonator process to generate power. The photo-thermal heating technology converts solar energy into heat energy for production and life use by collecting the solar energy.

The slot-type photothermal technology is an important photothermal technology which is already put into commercial use and has the widest application range. In the groove type photo-thermal technology, the solar track is tracked by tracking the sun through the groove type photo-thermal mirror and changing the position of a hot groove in real time, so that the utilization efficiency of solar energy is improved.

Disclosure of Invention

The application aims to provide a heat collecting groove driving method and device, an operation control method and a control device of a groove type photo-thermal solar system, and the stability of the heat collecting groove driving can be improved.

The application provides a heat collection groove intermittent driving method for a groove type photo-thermal solar system, which comprises the following steps:

acquiring a target tracking angle;

determining a real-time tracking angle, a stage steering angle, a limit tracking angle, a dead zone angle and a lag angle;

respectively calculating angle difference values of the real-time tracking angle, the target tracking angle and the stage steering angle;

obtaining judgment results according to the relationship between the angle difference value and the dead zone angle and the hysteresis angle respectively;

and intermittently driving the heat collecting groove to rotate in stages according to the judgment result.

According to an example embodiment of the present application, when the angle difference value X continuously decreases, the comparing the angle difference value X with the dead zone angle δ and the hysteresis angle σ and outputting the comparison result Y includes:

if X > (δ - σ), then Y ═ 1;

if X < - δ, then Y ═ 1;

if- δ ≦ X ≦ (δ - σ), Y is 0.

According to an exemplary embodiment of the present application, when the angle difference value X continues to increase, when the angle difference value is in a decreasing state, a determination result is obtained from a relationship between the angle difference value and the dead zone angle and the hysteresis angle according to the following equation:

if X > (δ - σ), then Y ═ 1;

if X < - δ, then Y ═ 1;

if- δ is not more than X not more than (δ - σ), Y is 0;

wherein X is an angle difference value, delta is a dead zone angle, sigma is a lag angle, and Y is a judgment result.

According to an exemplary embodiment of the present application, when the angle difference value X is in an increasing state, a determination result is obtained according to a relationship between the angle difference value and a dead zone angle and a hysteresis angle as follows:

if X > δ, Y ═ 1;

if X < - (δ - σ), then Y ═ 1;

if the- (delta-sigma) is not less than X and not more than delta, Y is 0;

wherein X is an angle difference value, delta is a dead zone angle, sigma is a lag angle, and Y is a judgment result.

Further, when the heat collecting tank driving is started, the angle difference value is in an increasing state by default.

According to an example embodiment of the application, the step steering angle comprises:

a forward first steering angle, a forward second steering angle, a reverse first steering angle, and a reverse second steering angle,

the extreme tracking angles include:

a first extreme tracking angle and a second extreme tracking angle,

wherein the forward first steering angle, the forward second steering angle, the reverse first steering angle, and the reverse second steering angle divide the forward rotation and the reverse rotation of the heat collecting tank into three stages, respectively:

a forward phase I, the real-time tracking angle being between a first limit tracking angle and the forward first steering angle;

a forward phase II, the real-time tracking angle being between the forward first steering angle and the forward second steering angle;

a forward III phase, wherein the real-time tracking angle is between the forward second steering angle and a second limit tracking angle;

wherein the reverse first steering angle and the reverse second steering angle divide the reverse rotation of the heat collecting slot into three stages:

a reverse I phase, the real-time tracking angle being between the second limit tracking angle and the reverse first steering angle;

a reverse phase II, wherein the real-time tracking angle is between the reverse first steering angle and the reverse second steering angle;

a reverse III phase, the real-time tracking angle being between the reverse second steering angle and the first extreme tracking angle.

According to an exemplary embodiment of the present application, said intermittently driving rotation of the heat collecting tank in stages according to the determination result comprises:

calculating a first angle difference between the real-time tracking angle and the forward first steering angle;

obtaining a first judgment result according to the relation between the first angle difference and the dead zone angle and the hysteresis angle;

calculating a fifth angle difference value of the real-time tracking angle and the target tracking angle;

obtaining a fifth judgment result according to the relationship between the fifth angle difference and the dead zone angle and the lag angle;

and if the first judgment result is not less than 0 and the fifth judgment result is 1, driving the heat collecting groove to rotate within the range of the forward I stage.

According to an exemplary embodiment of the present application, said intermittently driving rotation of the heat collecting tank in stages according to the determination result comprises:

calculating a first angle difference between the real-time tracking angle and the forward first steering angle;

obtaining a first judgment result according to the relation between the first angle difference and the dead zone angle and the hysteresis angle;

calculating a second angle difference between the real-time tracking angle and the forward second steering angle;

obtaining a second judgment result according to the relationship between the second angle difference and the dead zone angle and the lag angle;

calculating a fifth angle difference value of the real-time tracking angle and the target tracking angle;

obtaining a fifth judgment result according to the relationship between the fifth angle difference and the dead zone angle and the lag angle;

and if the first judgment result is-1, the second judgment result is not less than 0, and the fifth judgment result is 1, driving the heat collecting tank to rotate within the range of the forward direction II stage.

According to an exemplary embodiment of the present application, said intermittently driving rotation of the heat collecting tank in stages according to the determination result comprises:

calculating a second angle difference between the real-time tracking angle and the forward second steering angle;

obtaining a second judgment result according to the relationship between the second angle difference and the dead zone angle and the lag angle;

calculating a fifth angle difference value of the real-time tracking angle and the target tracking angle;

obtaining a fifth judgment result according to the relationship between the fifth angle difference and the dead zone angle and the lag angle;

and if the second judgment result is-1 and the fifth judgment result is 1, driving the heat collecting groove to rotate within the range of forward III stage.

According to an exemplary embodiment of the present application, said intermittently driving rotation of the heat collecting tank in stages according to the determination result comprises:

calculating a third angle difference between the real-time tracking angle and the reverse first steering angle;

obtaining a third judgment result according to the relation between the third angle difference value and the dead zone angle and the lag angle;

calculating a fifth angle difference value of the real-time tracking angle and the target tracking angle;

obtaining a fifth judgment result according to the relationship between the fifth angle difference and the dead zone angle and the lag angle;

and if the third judgment result is not greater than 0 and the fifth judgment result is-1, driving the heat collecting groove to rotate within the reverse I-phase range.

According to an exemplary embodiment of the present application, said intermittently driving rotation of the heat collecting tank in stages according to the determination result comprises:

calculating a third angle difference between the real-time tracking angle and the reverse first steering angle;

obtaining a third judgment result according to the relation between the third angle difference value and the dead zone angle and the lag angle;

calculating a fourth angle difference value between the real-time tracking angle and the reverse second steering angle;

obtaining a fourth judgment result according to the relationship between the fourth angle difference value and the dead zone angle and the lag angle;

calculating a fifth angle difference value of the real-time tracking angle and the target tracking angle;

obtaining a fifth judgment result according to the relationship between the fifth angle difference and the dead zone angle and the lag angle;

and if the third judgment result is 1, the fourth judgment result is not more than 0 and the fifth judgment result is-1, driving the heat collecting groove to rotate in a reverse II-stage range.

According to an exemplary embodiment of the present application, said intermittently driving rotation of the heat collecting tank in stages according to the determination result comprises:

calculating a fourth angle difference value between the real-time tracking angle and the reverse second steering angle;

obtaining a fourth judgment result according to the relationship between the fourth angle difference value and the dead zone angle and the lag angle;

calculating a fifth angle difference value of the real-time tracking angle and the target tracking angle;

obtaining a fifth judgment result according to the relationship between the fifth angle difference and the dead zone angle and the lag angle;

and if the fourth judgment result is 1 and the fifth judgment result is-1, driving the heat collecting groove to rotate in a reverse III-stage range.

According to an exemplary embodiment of the present application, said intermittently driving rotation of the heat collecting tank in stages according to the determination result comprises:

calculating a fifth angle difference value of the real-time tracking angle and the target tracking angle;

obtaining a fifth judgment result according to the relationship between the fifth angle difference and the dead zone angle and the lag angle;

and if the fifth judgment result is 0, keeping the heat collecting groove at the current position.

According to an exemplary embodiment of the application, the dead band angle range comprises 0.3 ° -0.5 °, and the hysteresis angle range comprises 0.1 ° -0.2 °.

The present application further provides a slot type photo-thermal solar system's heat collection slot intermittent drive control device, including:

a target angle acquisition module: for obtaining a target tracking angle.

The reference angle input module is used for determining a real-time tracking angle, a stage steering angle, a dead zone angle and a lag angle;

the angle difference calculation module is used for calculating the angle difference between the real-time tracking angle and the target tracking angle and the angle difference between the real-time tracking angle and the stage steering angle respectively;

the judgment result output module is used for respectively obtaining a judgment result according to the relation between the angle difference value and the dead zone angle and the hysteresis angle;

and the driving control execution module is used for intermittently driving the heat collection groove to rotate in stages according to the judgment result.

The application also provides a multi-mode control method of the trough type photo-thermal solar system, which comprises the following steps:

determining an operation mode;

determining a target tracking angle according to the operation mode;

the heat collecting tank intermittent driving method as described above is performed according to the target tracking angle.

According to an example embodiment of the present application, the operation mode is an automatic tracking mode, and the determining the target tracking angle includes:

calculating a sun altitude angle and a sun azimuth angle according to the geographical position information of the current time;

judging whether the arrangement direction of the heat collecting grooves is arranged in the east-west direction or in the south-north direction;

and calculating the target tracking angle in real time according to the arrangement direction of the heat collecting grooves.

According to an exemplary embodiment of the present application, the calculating a target tracking angle in real time according to an arrangement direction of heat collecting slots includes:

when the heat collecting grooves are arranged in the east-west direction,

when the heat collecting grooves are arranged in the north-south direction,

where ρ is_tarTracking angle for target, α_sIs the solar altitude angle, gamma_sIs the solar azimuth.

According to an example embodiment of the present application, the operating mode is a predetermined tracking mode, and the determining a target tracking angle includes:

and taking a preset debugging tracking angle as a target tracking angle.

According to an example embodiment of the present application, the operation mode is an emergency defocus mode, and the determining the target tracking angle includes:

and taking the sum of the actual tracking angle and the input defocusing deviation angle as a target tracking angle.

According to an example embodiment of the present application, the operating mode is a wind-proof mode, and the determining a target tracking angle includes:

and taking the input wind-proof angle as a target tracking angle.

According to an example embodiment of the present application, the operating mode is a standby mode, and the determining a target tracking angle includes:

and taking the input standby working angle as a target tracking angle.

According to an example embodiment of the present application, the operating mode is a cleaning mode, and the determining the target tracking angle includes:

and taking the input optimal cleaning angle as a target tracking angle.

The present application further provides a multi-mode control device for a trough photo-thermal solar system, comprising:

one or more processors;

storage means for storing one or more programs;

when executed by the one or more processors, cause the one or more processors to implement the method of any one of claims 17-25.

The present application further provides a trough-type photo-thermal solar system, including:

a heat collection tank;

the heat conduction oil device is connected with the heat collection groove through an oil pipeline;

the circulating water device is connected with the heat collecting groove through a pipeline;

the hydraulic driving mechanism is connected with the heat collecting groove and drives the heat collecting groove to rotate, and comprises a four-way three-position four-way middle pressure relief type electromagnetic valve;

the control device or the multi-mode control electronic equipment controls the four-way three-position four-way middle pressure relief type electromagnetic valve to be opened and closed.

The present application also provides a computer-readable medium on which a computer program is stored, which program, when executed by a processor, implements any of the operation control methods described above.

Additional aspects and advantages of the present application will be set forth in part in the description which follows and, in part, will be obvious from the description, or may be learned by practice of the present application.

Drawings

In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings needed to be used in the description of the embodiments will be briefly introduced below, and it is apparent that the drawings in the following description are only some embodiments of the present application.

Fig. 1 shows a schematic composition diagram of a trough-type photo-thermal solar system according to an exemplary embodiment of the present application.

Fig. 2 shows a schematic diagram of a trench-based photo-thermal solar system control logic according to an exemplary embodiment of the present application.

Fig. 3 shows a schematic view of the principle of hydraulic control of the heat collection tank according to an exemplary embodiment of the present application.

FIG. 4 is a flowchart illustrating an intermittent driving method of a heat collecting slot according to an exemplary embodiment of the present application.

Fig. 5 illustrates a difference comparison determination schematic according to an exemplary embodiment of the present application.

FIG. 6 is a block diagram showing the composition of an intermittent drive control apparatus of a heat collecting tank according to an exemplary embodiment of the present application.

FIG. 7 shows a multi-mode control flow diagram according to an example embodiment of the present application.

Fig. 8 shows a block diagram of a multi-operation mode control apparatus according to an exemplary embodiment of the present application.

Fig. 9 illustrates a block diagram of a multi-operation mode control apparatus according to an exemplary embodiment of the present application.

Detailed Description

Example embodiments will now be described more fully hereinafter with reference to the accompanying drawings. Example embodiments may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein. These embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the concept of example embodiments to those skilled in the art. The same reference numerals denote the same or similar parts in the drawings, and thus, a repetitive description thereof will be omitted.

Furthermore, the described features, structures, or characteristics may be combined in any suitable manner in one or more embodiments. In the following description, numerous specific details are provided to give a thorough understanding of embodiments of the application. One skilled in the relevant art will recognize, however, that the subject matter of the present application can be practiced without one or more of the specific details, or with other methods, components, devices, steps, and so forth. In other instances, well-known methods, devices, implementations, or operations have not been shown or described in detail to avoid obscuring aspects of the application.

It will be understood that, although the terms first, second, etc. may be used herein to describe various components, these components should not be limited by these terms. These terms are used to distinguish one element from another. Thus, a first component discussed below may be termed a second component without departing from the teachings of the present concepts. As used herein, the term "and/or" includes any and all combinations of one or more of the associated listed items.

Those skilled in the art will appreciate that the drawings are merely schematic representations of exemplary embodiments, which may not be to scale. The blocks or flows in the drawings are not necessarily required to practice the present application and therefore should not be used to limit the scope of the present application.

The inventor finds that the prior art has carried out related research on the control of the groove type photothermal mirror, but the following problems still exist: in the real-time tracking process, the energy consumption for continuously driving the heat collecting groove to rotate is large; during intermittent tracking, the tracking angle threshold is not clear; the calculation of the sun position in the PLC system mostly adopts a simplified astronomical formula, and the calculation precision is low; the position of the heat collecting groove is adjusted to be open-loop adjustment, and the tracking precision is not high; the tracking mode is single; the transition between the tracking modes of operation is not unambiguous; there is less consideration for control protection modes in high wind inclement weather or where rapid solar radiation rise causes focus overheating, etc.

Aiming at the problems of high energy consumption, unstable operation and the like of a heat collecting groove of a groove type photo-thermal solar system in the prior art in the driving control process, the invention provides an intermittent driving method of the heat collecting groove.

The technical solution of the present application will be described in detail below with reference to the accompanying drawings.

Fig. 1 shows a schematic composition diagram of a trough-type photo-thermal solar system according to an exemplary embodiment of the present application.

As shown in fig. 1, the trough type photo-thermal solar system 1000 includes a heat collecting device 100, a heat conducting oil device 200, a water circulating device 300, and a control device 400. The heat collecting device 100 includes a heat collecting tank 110, a support frame, and a hydraulic driving mechanism. The conduction oil device 200 includes an intermediate oil tank 210, an oil-water separator 220, a conduction oil pump 230, an oil delivery pipe, and the like. The water circulating apparatus 300 includes a water circulating pump 310, a heat exchanger 320, and piping.

The heat collecting tank 110 further includes a reflector and a heat collecting tube. According to an exemplary embodiment of the application, the heat collecting groove is formed by 28 reflector plates, the total length is 27m, and the area is 151.2m². The opening of the heat collecting groove is 5.77m, and the focal length is 1.71 m. The heat collecting pipe is a vacuum stripping heat collecting pipe, the outer diameter is 0.125m, and the inner diameter is 0.122 m.

The operation of the trough photo-thermal solar system 1000 is as follows: the heat conducting oil in the intermediate oil storage tank 210 is pumped into the heat collecting pipe pipeline of the heat collecting device 100 through the heat conducting oil pump 230. The control device 400 drives the heat collecting groove to rotate along with the sun track through the hydraulic driving mechanism. The heat conducting oil absorbs heat in the heat collecting pipe, and the temperature rises, and then the heat is transferred to the circulating water through the heat exchanger 320 and enters the oil-gas separator 220. For example, the heat exchanger 320 may be a tube heat exchanger or a plate heat exchanger.

The oil separator 220 is connected to the intermediate oil tank 210 and the conduction oil pump 230 through pipes, respectively. In the oil-gas separator 220, gas generated by the heat transfer oil due to the gasification phenomenon is discharged through the exhaust hole, the expanded heat transfer oil flows into the intermediate oil storage tank 210, and the rest of the heat transfer oil enters the heat transfer oil pump 230 to perform the next cycle.

In the whole circulation, the rotating speed of the heat conduction oil pump 230 is controlled through the frequency converter, so that the flow speed of heat conduction oil in the pipe can be controlled. The state of heat conducting oil at the inlet and the outlet of the heat collecting tube is detected through a pressure sensor, a temperature sensor and a flow sensor. Under special requirements, a bypass valve of the pipeline at the upper part of the heat exchanger 320 can be opened, and heat conducting oil at the outlet of the heat collecting pipe is directly sent to the oil-gas separator 220 without passing through the heat exchanger 320.

Fig. 2 shows a schematic diagram of a trench-based photo-thermal solar system control logic according to an exemplary embodiment of the present application.

As shown in fig. 2, the control device 400 performs control using PLC hardware. The control device 400 is connected with the control panel 410 and the data acquisition module 420 through hard wires. For example, the temperature, pressure, flow rate, etc. of the thermal oil collected by the data collection module through the sensor are transmitted to the control device 400 through hard wiring. The control panel 410 is provided with start, stop and emergency stop buttons. Such switching amount information is transmitted to the control device 400 through hard wiring. The control device 400 communicates with a tilt angle position encoder 430 arranged on the heat collecting tank via Modbuds TCP or Modbus RTU. The control device 400 communicates with the upper computer 450. The upper computer 450 is used for monitoring the current actual operation mode, the solar altitude angle, the solar azimuth angle, the target tracking angle and the actual tracking angle, and meanwhile, mode selection and manual setting of the target tracking angle in the set tracking mode can be carried out. The control device 400 and the hydraulic system 120 control the solenoid valve of the hydraulic system to be powered on or powered off, so as to drive the hydraulic cylinder to act, thereby driving the heat collecting groove to track the position of the sun.

Because the area of the heat collecting groove is large, the wind resistance is also large, and the diameter of the heat collecting pipe is small, the precision of tracking the sun by the heat collecting groove is high, and the torque of the control actuating mechanism is large. Based on the above characteristics, in the exemplary embodiment of the present application, the hydraulic system 120 is a high-low pressure double-cylinder push-pull hydraulic system. The hydraulic system has the advantages of large driving torque and wide driving corner range, so that the condenser has high tracking precision.

Fig. 3 shows a schematic view of the principle of hydraulic control of the heat collection tank according to an exemplary embodiment of the present application.

According to an example embodiment of the present application, the hydraulic drive mechanism employs a high and low pressure dual cylinder push-pull hydraulic system. The hydraulic driving system comprises two pull rods and four electromagnetic valves. The electromagnetic valve adopts a three-position four-way middle pressure relief type electromagnetic direction control valve.

In the actual operation of the system, the position encoder measures the angle position of the heat collecting groove, and data are transmitted to the control module through RS-485 serial port communication. The control module sends a control instruction through data processing to control the power on and power off of the electromagnetic valve of the hydraulic system, so that the hydraulic cylinder is driven to act, and the heat collecting groove is driven to track the position of the sun. The hydraulic system is provided with 2-way pull rods connected to the main shaft of the heat collecting pipe, and four-way electromagnetic valves are arranged to control the extension and contraction of the 2-way pull rods.

FIG. 4 is a flowchart illustrating an intermittent driving method of a heat collecting slot according to an exemplary embodiment of the present application.

As shown in fig. 4, the present application provides an intermittent driving method of a heat collecting tank, comprising:

at S110, a target tracking angle is acquired. The target tracking angle can be determined in various ways according to different operation mode requirements. For example, when the trough type photo-thermal solar system is in an automatic tracking operation mode, the target tracking angle can be calculated through the geographic information at the time. When the trough type photo-thermal solar system is in a manual tracking operation mode, a target tracking angle can be manually input. For another example, when the trough type photo-thermal solar system is in a specific operation mode, a specific angle can be used as a target tracking angle.

At S120, a real-time tracking angle, a phase steering angle, a limit tracking angle, a dead-zone angle, and a lag angle are determined. According to an exemplary embodiment of the present application, the real-time tracking angle may be acquired by a position encoder provided on the heat collecting tank. The position encoder may be an absolute value encoder or an incremental encoder.

In an embodiment of the present application, the step steering angle θ includes a forward first steering angle θ_nts1Positive second steering angle theta_nts2Reverse first steering angle theta_stn1And a reverse second steering angle theta_stn2. The high-low pressure double-cylinder push-pull type hydraulic system adopted in the embodiment of the application provides a forward first steering angle theta_nts1Positive second steering angle theta_nts2Reverse first steering angle theta_stn1And a reverse second steering angle theta_stn2. The tracking angle of the heat collection slot may be defined as: when the normal of the heat collecting groove rotates to the north direction, the tracking angle is 90 degrees; when the normal of the heat collecting groove rotates to the south, the tracking angle is-90 degrees; when the normal of the heat collecting groove rotates to coincide with the zenith direction, the tracking angle is 0 °. At this time, the north limit tracking angle θ_NCan be set to 85 DEG and south limit tracking angle theta_SMay be set at-85.

Positive first steering angle theta_nts1Second steering angle theta with positive direction_nts2The forward driving range of the hydraulic system is divided into a forward I stage, a forward II stage and a forward III stage. Wherein when theta_nts1<ρ≤θ_NThen, it is the forward I phase. When theta is_nts2≤ρ≤θ_nts1Then, it is the forward phase II. When theta is_S≤ρ<θ_nts2Is, forward stage III.

In a similar manner, the first reverse steering angle θ_stn1And a reverse second steering angle theta_stn2The reverse driving range of the hydraulic system is divided into a reverse I stage, a reverse II stage and a reverse III stage. Wherein when theta_S≤ρ<θ_stn1In time, it is in reverse stage I. When theta is_stn1≤ρ≤θ_stn2In the reverse phase II. When theta is_stn2<ρ≤θ_NIs, reverse phase III.

According to the intermittent driving method for the heat collecting groove, when the difference value between the target tracking angle and the actual tracking angle is within a small angle (defined as a dead zone angle), the hydraulic system does not drive, the current position of the heat collecting groove is kept, and therefore frequent rotation of the heat collecting groove caused by errors is avoided, and energy consumption is reduced. In addition, according to the intermittent driving method for the heat collecting groove, the phenomenon that the heat collecting groove shakes due to data lag of the collecting sensor is avoided by setting the lag angle, and the driving stability of the heat collecting groove is improved. In the embodiment of the application, according to the operation simulation result of the hydraulic system and by taking the influence of the tracking angle deviation on the solar energy capturing loss and the real-time rotation energy consumption condition of the heat collecting groove into synergistic consideration, the dead zone angle delta can be set to be 0.3-0.5 degrees, and the lag angle sigma can be set to be 0.1-0.2 degrees. The hydraulic system used is different, and the corresponding dead zone angle and the lag angle are also different.

In S130, angle differences between the real-time tracking angle and the target tracking angle and between the real-time tracking angle and the stage steering angle are calculated, respectively. Because the hydraulic system that this application embodiment adopted provides four stages of steering angles, angle difference X correspondingly includes: a first angle difference X1, a second angle difference X2, a third angle difference X3, a fourth angle difference X4, and a fifth angle difference X5.

Wherein the first angle difference X1 is a difference between the real-time tracking angle and the forward first steering angle. The second angular difference X2 is the difference between the real-time tracking angle and the forward second steering angle. The third angular difference X3 is the difference between the real-time tracking angle and the reverse first steering angle. The fourth angle difference X4 is the difference between the real-time tracking angle and the reverse second steering angle. The fifth angle difference X5 is the difference between the real-time tracking angle and the target tracking angle.

In S140, a determination result is obtained according to the relationship between the angle difference and the dead zone angle and the hysteresis angle, respectively. The angular difference calculated in S130 includes X1-X5. Accordingly, in S140, the comparison result Y1 may be output according to the angle difference X1. And outputting a comparison result Y2 according to the angle difference X2. And outputting a comparison result Y3 according to the angle difference X3. And outputting a comparison result Y4 according to the angle difference X4. And outputting a comparison result Y5 according to the angle difference X5.

In the intermittent driving method of the heat collecting groove, the values of the comparison result Y are-1, 0 and 1. The specific definition will be described with reference to fig. 5.

In S150, the heat collecting groove is intermittently driven to rotate in stages according to the judgment result. The embodiment of the application adopts a high-low pressure double-cylinder push-pull type hydraulic system. The hydraulic system is driven and controlled by four electromagnetic valves. Thus, the set of solenoid valves includes a first solenoid valve, a second solenoid valve, a third solenoid valve, and a fourth solenoid valve.

Specifically, the process of controlling a group of solenoid valves of the hydraulic system to drive the heat collecting grooves to rotate in stages according to the comparison result Y is as follows:

and when the first comparison result Y1 is greater than or equal to 0 and the fifth comparison result Y5 is equal to 1, opening the first electromagnetic valve and the third electromagnetic valve, closing the second electromagnetic valve and the fourth electromagnetic valve, and driving the heat collecting groove to rotate within the range of the positive I stage.

And when the first comparison result Y1 is equal to-1, the second comparison result Y2 is greater than or equal to 0, and the fifth comparison result Y5 is equal to 1, opening the second electromagnetic valve and the third electromagnetic valve, closing the first electromagnetic valve and the fourth electromagnetic valve, and driving the heat collection groove to rotate in the range of the forward direction II stage.

When the second comparison result Y2 is equal to-1 and the fifth comparison result Y5 is equal to 1, the second solenoid valve and the fourth solenoid valve are opened, the first solenoid valve and the third solenoid valve are closed, and the heat collecting tank is driven to rotate within the forward III-step range.

And when the third comparison result Y3 is less than or equal to 0 and the fifth comparison result Y5 is equal to-1, opening the first electromagnetic valve and the third electromagnetic valve, closing the second electromagnetic valve and the fourth electromagnetic valve, and driving the heat collecting groove to rotate within the reverse I-phase range.

And when the third comparison result Y3 is equal to 1, the fourth comparison result Y4 is less than or equal to 0 and the fifth comparison result Y5 is equal to-1, opening the first electromagnetic valve and the fourth electromagnetic valve, closing the second electromagnetic valve and the second electromagnetic valve, and driving the heat collecting groove to rotate in a reverse II-stage range.

When the fourth comparison result Y4 is equal to 1 and the fifth comparison result Y5 is equal to-1, the second solenoid valve and the fourth solenoid valve are opened, and the heat collecting tank is driven to rotate in the reverse III-phase range.

When the fifth comparison result Y5 is 0, the set of solenoid valves is closed, maintaining the heat collecting slot at the current position.

Wherein the real-time tracking angle rho and the target tracking angle rho_tarA comparison result of the difference value of 1 indicates that the heat collecting tank is allowed to be rotated in a forward direction, a comparison result of-1 indicates that the heat collecting tank is allowed to be rotated in a reverse direction, and a comparison result of 0 indicates that the heat collecting tank is not allowed to be rotated.

Fig. 5 illustrates a difference comparison determination schematic according to an exemplary embodiment of the present application.

As shown in FIG. 5, in the intermittent driving method for heat collecting tank provided by the present application, the logic for judging the comparison result Y is:

when the angular deviation is continuously decreasing, i.e. the angular difference X is continuously decreasing, if X > (δ - σ), then Y is 1; if X < - δ, then Y ═ 1; if- δ ≦ X ≦ (δ - σ), Y is 0.

When the angular deviation continues to increase, that is, the angular difference X continues to increase, if X > δ, Y is 1; if X < - (δ - σ), then Y ═ 1; if ≦ X ≦ δ, Y is 0.

Wherein, when the heat collecting tank is started, the angle deviation is in a continuously increasing state by default.

According to the intermittent driving method for the heat collecting groove, in the staged operation process of the high-low pressure double-cylinder push-pull type hydraulic system, the dead zone angle between the target tracking angle and the actual tracking angle is set, so that the hydraulic system keeps the current position in the dead zone angle, frequent rotation of the heat collecting groove caused by errors is avoided, and energy consumption is reduced; by setting the lag angle, the phenomenon of shaking of the heat collecting groove caused by data lag of the collecting sensor is avoided.

FIG. 6 is a block diagram showing the composition of an intermittent drive control apparatus of a heat collecting tank according to an exemplary embodiment of the present application.

The present application further provides an intermittent driving control apparatus 600 for a heat collecting tank. As shown in fig. 6, the control device 600 includes: a target angle acquisition module 610, a reference angle input module 620, an angle difference value calculation module 630, a judgment result output module 640, and a driving control execution module 650. Wherein:

the target angle obtaining module 610 is used for obtaining a target tracking angle ρ_tar. The target tracking angle can be determined in various ways according to different operation control mode requirements. For example, when the trough type photo-thermal solar system is in an automatic tracking operation mode, the target tracking angle can be calculated through the geographic information at the time. When the trough type photo-thermal solar system is in a manual tracking operation mode, a target tracking angle can be manually input. For another example, when the trough type photo-thermal solar system is in a specific operation mode, a specific angle can be used as a target tracking angle.

The reference angle input module 620 is used for inputting a real-time tracking angle ρ, a phase steering angle θ, a dead zone angle δ, and a lag angle σ. For example, the real-time tracking angle ρ may be acquired in real time by a position encoder provided on the heat collecting tank. Target tracking angle ρ_tarThe target tracking angle can be calculated through the geographic information at the time. The steering angle θ may be determined according to the hydraulic system employed. The dead band angle δ and the hysteresis angle σ can be determined from simulation results of the hydraulic system.

The angle difference calculation module 630 is used for calculating the real-time tracking angle ρ and the target tracking angle ρ respectively_tarAnd an angle difference X of the step steering angle theta.

And the judgment result output module 640 is used for obtaining a judgment result Y according to the relationship between the angle difference and the X and the dead zone angle δ and the hysteresis angle σ. The values of the judgment result Y are-1, 0 and 1, and the specific judgment logic refers to the judgment logic principle shown in fig. 5.

The driving control execution module 650 is configured to intermittently drive the heat collecting tank to rotate in stages according to the determination result. In the embodiment of the application, the hydraulic system can adopt a high-low pressure double-cylinder push-pull type hydraulic system. The four electromagnetic valves can control the hydraulic system to drive in two-way and three-stage.

In addition, the control method for the seven operation modes in normal operation of the groove type photo-thermal heat collection device is provided, aiming at the problems that the tracking mode of the existing groove type photo-thermal solar system is single, the conversion basis among a plurality of tracking operation modes is not clear, and the like, and especially, the control protection mode for the conditions of focusing overheating and the like caused by severe wind or rapid improvement of solar radiation is less considered.

The priorities of the seven operation modes are as follows from top to bottom: manual tracking mode, automatic tracking mode, set tracking mode, emergency defocus mode, windbreak mode, standby mode, and purge mode. The seven modes can be set through an HMI interface of the upper computer. And traversing the seven modes according to set logic and executing the seven modes in each operation period of the PLC after the system is started.

The manual tracking mode is a mode adopted during manual control in the debugging stage. The auto-track mode is the mode employed during normal operation. The setting of the tracking mode is a mode adopted by the commissioning phase to rotate the heat collecting tank to a specified position. The emergency defocus mode is a safe mode for reducing the oil temperature when the temperature of the heat transfer oil is too high. The wind-proof mode is a mode used in windy weather. The standby mode is a mode employed at the time of equipment maintenance. The cleaning mode is a mode used when cleaning the mirror plate.

Correspondingly, the manual tracking mode operation control method provided by the application comprises the following steps: and judging whether the remote control enabling state word of the operation stage of the actual tracking angle of the heat collecting groove is input or not. If it is already put into practice, the above-mentioned intermittent driving method of the heat collecting tank is performed with the manually inputted tracking angle as the target tracking angle. If not, keeping the position of the heat collecting groove still.

The automatic tracking mode operation control method comprises the step of calculating the solar altitude according to the geographic position information of the current time α_sAzimuth angle gamma to the sun_s. And judging the arrangement direction of the heat collecting grooves to be arranged in the east-west direction or in the north-south direction. Calculating a target tracking angle rho in real time according to the arrangement direction of the heat collecting grooves_tar(ii) a When the arrangement direction of the heat collecting grooves is east-west arrangement,

when the arrangement direction of the heat collecting grooves is arranged in the north-south direction,

according to the real-time calculated target tracking angle rho_tarAnd the above-mentioned heat collecting tank intermittent driving method is performed.

The application provides a method for controlling the operation of a preset tracking mode, which comprises the following steps: and executing the intermittent driving method of the heat collecting tank according to the input preset debugging tracking angle.

The application provides an emergency defocus mode operation control method, which comprises the following steps: the above-described intermittent driving method of the heat collecting tank is performed with the sum of the actual tracking angle and the inputted defocus offset angle as the target tracking angle. For example, the defocus deviation angle may be set to 2 °.

The application provides a windproof mode operation control method, including: and executing the intermittent driving method of the heat collecting tank by taking the input wind-proof angle as a target tracking angle. For example, the wind-break angle may be set between 70 ° and 85 °.

The standby mode operation control method provided by the application comprises the following steps: and executing the intermittent driving method of the heat collecting tank by taking the input standby working angle as a target tracking angle. For example, the standby operating angle may be set between 70 and 80.

The application provides a cleaning mode operation control method, including: and executing the intermittent driving method of the heat collecting tank by taking the input optimal cleaning angle as a target tracking angle. For example, the optimum cleaning angle may be set to-90 ° or 90 °.

FIG. 7 shows a multi-mode control flow diagram according to an example embodiment of the present application.

When the groove type photo-thermal solar system operates, a target operation mode is selected on an HMI (human machine interface) picture of the upper computer, and then the step 401 is executed.

In step 401, after a start button on a control cabinet panel is pressed, the control cabinet enters step 402 to perform self-checking of the controller. And after the self-checking is normal, the step 403 is carried out, and whether the connection communication between the PLC and each device is normal or not is judged. After the connection is normal, the process proceeds to step 404 to wait for the operation scan cycle time to come.

In step 404, after each operation cycle of the PLC arrives, the process proceeds to step 405, and it is determined whether the current time is within the allowable operation time range. If so, proceed to step 406. The operation time used in this example was 7:00-18: 00.

In step 406, if the current operation mode is determined to be the manual tracking mode, step 407 is entered, otherwise step 410 is entered.

In step 407, it is determined whether the remote control enabled state word of the phase at which the current heat collecting tank inclination angle is located is entered. If so, the process proceeds to step 408 where the rotation of the heat collecting tank is controlled by opening both solenoid valves. Otherwise, go to step 409, i.e. keep 4 solenoids closed.

In step 410, if the current operation mode is the set tracking mode, step 411 is entered, otherwise step 412 is entered. In step 411, according to the set target tracking angle on the upper computer HMI and the three sections divided by the two steering angles, the sequence number of the opened electromagnetic valve is determined through logical operation, and the heat collection groove is driven to rotate.

In step 412, if the current operation mode is the emergency defocus mode, step 413 is entered, otherwise step 414 is entered. In step 413, the current tracking angle target value is set as the sum of the current heat collecting slot actual tracking angle and the specific defocus offset angle. For example, in the present embodiment, the defocus deviation angle is set to 2 °.

In step 414, if the current operation mode is determined to be the windproof mode, step 415 is entered, otherwise step 416 is entered. In step 415, the target tracking angle is set to 80 °, i.e. the normal direction of the heat collecting tank coincides with the zenith direction.

In step 416, if the current operation mode is determined to be the standby mode, step 417 is entered, otherwise step 418 is entered. In step 417, the target tracking is set to a standby angle. For example, in the present embodiment, the standby angle is 75 °.

In step 418, if the current operation mode is the cleaning mode, step 419 is performed, otherwise step 420 is performed. In step 419, the target tracking angle is set to either the south limit position, i.e., -90 °, or the north limit position, i.e., 90 °.

In step 420, if the current operation mode is determined to be the automatic tracking operation mode, step 421 is entered, otherwise step 423 is entered.

In step 421, the solar altitude and the solar azimuth are calculated according to the longitude and latitude, the time, the air pressure, the temperature and the altitude of the location, and the process goes to step 422.

In step 422, a target tracking angle is calculated based on the solar altitude and the solar azimuth.

In step 423, it is indicated that if no operation mode is selected on the HMI interface of the upper computer, all four solenoid valves are kept in the closed state, and the current position state of the heat collecting tank is kept. Then, step 424 is entered, and the PLC waits for the next operation cycle, i.e. the next scan.

Fig. 8 shows a block diagram of a multi-operation mode control apparatus according to an exemplary embodiment of the present application.

As shown in fig. 8, the present application also provides a multi-operation mode control apparatus 800 including: an automatic tracking mode control unit 810, a manual tracking mode control unit 820, a predetermined tracking module control unit 830, an emergency defocus mode control unit 840, a wind prevention mode control unit 850, a standby mode control unit 860, and a wash mode control unit 870. Wherein:

and an automatic tracking mode control unit 810 for receiving a control command for entering an automatic tracking operation mode and executing the automatic tracking operation control method. A manual tracking mode control unit 820, configured to receive a control command for entering the manual tracking operation mode, and execute the above-mentioned manual tracking mode operation control method. The predetermined tracking module control unit 830 is configured to receive a control instruction for entering the predetermined tracking mode, and execute the predetermined tracking mode operation control method. The emergency defocus mode control unit 840 is configured to receive a control command for entering the emergency defocus mode, and execute the emergency defocus mode operation control method. And a wind-proof mode control unit 850 for receiving a control command for entering the wind-proof mode, and executing the predetermined tracking mode operation control method described above. And a standby mode control unit 860 for receiving a control command for entering a standby mode and executing the standby mode operation control method. The washing mode control unit 870 is configured to receive a control command for entering the washing mode, and execute the washing mode operation control method.

Fig. 9 illustrates a block diagram of a multi-operation mode control apparatus according to an exemplary embodiment of the present application.

The present application also provides a multiple operating mode control device 900 for a trough photo-thermal solar system. The control device 900 shown in fig. 9 is only an example, and should not bring any limitation to the functions and the scope of use of the embodiments of the present application.

As shown in fig. 9, the control device 900 is in the form of a general purpose computing device. The components of the control device 900 may include, but are not limited to: at least one processing unit 910, at least one memory unit 920, a bus 930 that couples various system components including the memory unit 920 and the processing unit 910, and the like.

The storage unit 920 stores program code, which can be executed by the processing unit 910, so that the processing unit 910 performs the methods according to the embodiments of the present application described in the present specification.

The storage unit 920 may include a readable medium in the form of a volatile storage unit, such as a random access memory unit (RAM)9201 and/or a cache memory unit 9202, and may further include a read only memory unit (ROM) 9203.

Storage unit 920 may also include a program/utility 9204 having a set (at least one) of program modules 9205, such program modules 9205 including but not limited to: an operating system, one or more application programs, other program modules, and program data, each of which, or some combination thereof, may comprise an implementation of a network environment.

Bus 930 can be any of several types of bus structures including a memory unit bus or memory unit controller, a peripheral bus, an accelerated graphics port, a processing unit, or a local bus using any of a variety of bus architectures.

The electronic device 900 may also communicate with one or more external devices 9001 (e.g., a touch screen, keyboard, pointing device, bluetooth device, etc.), with one or more devices that enable a user to interact with the electronic device 900, and/or with any devices (e.g., a router, modem, etc.) that enable the electronic device 900 to communicate with one or more other computing devices. Such communication may occur via input/output (I/O) interface 950. Also, the electronic device 900 may communicate with one or more networks (e.g., a Local Area Network (LAN), a Wide Area Network (WAN) and/or a public network, such as the Internet) via the network adapter 960. The network adapter 960 may communicate with other modules of the electronic device 900 via the bus 930. It should be appreciated that although not shown, other hardware and/or software modules may be used in conjunction with the electronic device 900, including but not limited to: microcode, device drivers, redundant processing units, external disk drive arrays, RAID systems, tape drives, and data backup storage systems, among others.

On this basis, the application provides a slot type photo-thermal solar energy system, includes: a heat collection tank; the heat conduction oil device is connected with the heat collection groove through an oil pipeline; the circulating water device is connected with the heat collecting groove through a pipeline; the hydraulic driving mechanism is connected with the heat collecting groove and drives the heat collecting groove to rotate and comprises a four-way three-position four-way middle pressure relief type electromagnetic valve; and the intermittent driving device of the heat collecting groove or the multi-mode control equipment controls the four-way three-position four-way middle pressure relief type electromagnetic valve to be opened and closed.

In addition, the present application also provides a computer readable medium, on which a computer program is stored, wherein the program is characterized in that the program realizes the above different operation mode control methods when being executed by a processor.

According to the intermittent driving method for the heat collecting groove, the heat collecting groove is prevented from frequently rotating by a dead zone angle method; and frequent shaking of the heat collecting groove at the dead zone angle boundary is avoided by setting a lag angle. Through reasonable arrangement of the dead zone and the hysteresis value, the regulation characteristic of the heat collecting groove is improved, and meanwhile, the high-efficiency solar energy collection of the heat collecting groove can be kept.

In addition, on the basis of the intermittent driving method for the heat collecting groove, the method provides multiple system operation modes, defines a mode switching execution flow, reduces energy consumption of a control system, avoids adjustment jitter of the heat collecting groove, captures solar energy to the maximum extent, reasonably controls electromagnetic opening and closing, accurately controls rotation of the heat collecting groove, achieves closed-loop tracking, and accordingly guarantees efficient and stable operation of the photo-thermal mirror field.

It should be understood that the above examples are only for clearly illustrating the present application and are not intended to limit the embodiments. Other variations and modifications will be apparent to persons skilled in the art in light of the above description. And are neither required nor exhaustive of all embodiments. And obvious variations or modifications of this invention may be made without departing from the spirit or scope of the invention.

Claims (25)

1. An intermittent driving method for a heat collecting groove of a groove type photo-thermal solar system is characterized by comprising the following steps:

acquiring a target tracking angle;

determining a real-time tracking angle, a stage steering angle, a limit tracking angle, a dead zone angle and a lag angle;

respectively calculating angle difference values of the real-time tracking angle, the target tracking angle and the stage steering angle;

obtaining judgment results according to the relationship between the angle difference value and the dead zone angle and the hysteresis angle respectively;

and intermittently driving the heat collecting groove to rotate in stages according to the judgment result.

2. An intermittent driving method of a heat collecting tank as recited in claim 1, wherein a judgment result is obtained from a relation of said angle difference value with a dead zone angle and a hysteresis angle in accordance with the following equation when said angle difference value is in a decreasing state:

if X > (δ - σ), then Y ═ 1;

if X < - δ, then Y ═ 1;

if- δ is not more than X not more than (δ - σ), Y is 0;

wherein X is an angle difference value, delta is a dead zone angle, sigma is a lag angle, and Y is a judgment result.

3. An intermittent driving method of a heat collecting tank as recited in claim 1, wherein a judgment result is obtained from a relation of said angle difference value with a dead zone angle and a hysteresis angle in accordance with the following equation when said angle difference value X is in an increased state:

if X > δ, Y ═ 1;

if X < - (δ - σ), then Y ═ 1;

if the- (delta-sigma) is not less than X and not more than delta, Y is 0;

wherein X is an angle difference value, delta is a dead zone angle, sigma is a lag angle, and Y is a judgment result.

4. An intermittent driving method of a heat collecting tank as recited in claim 2 or 3, wherein said angle difference value is in an increased state by default at the time of starting said driving of the heat collecting tank.

5. A heat collecting slot intermittent driving method as claimed in claim 2 or 3, characterized in that said step steering angle comprises:

a forward first steering angle, a forward second steering angle, a reverse first steering angle, and a reverse second steering angle,

the extreme tracking angles include:

a first extreme tracking angle and a second extreme tracking angle,

wherein the forward first steering angle, the forward second steering angle, the reverse first steering angle, and the reverse second steering angle divide the forward rotation and the reverse rotation of the heat collecting tank into three stages, respectively:

a forward phase I, the real-time tracking angle being between a first limit tracking angle and the forward first steering angle;

a forward phase II, the real-time tracking angle being between the forward first steering angle and the forward second steering angle;

a forward III phase, wherein the real-time tracking angle is between the forward second steering angle and a second limit tracking angle;

wherein the reverse first steering angle and the reverse second steering angle divide the reverse rotation of the heat collecting slot into three stages:

a reverse I phase, the real-time tracking angle being between the second limit tracking angle and the reverse first steering angle;

a reverse phase II, wherein the real-time tracking angle is between the reverse first steering angle and the reverse second steering angle;

a reverse III phase, the real-time tracking angle being between the reverse second steering angle and the first extreme tracking angle.

6. A heat collecting tank intermittent driving method as claimed in claim 5, wherein said intermittently driving rotation of the heat collecting tank in stages according to said judgment result comprises:

calculating a first angle difference between the real-time tracking angle and the forward first steering angle;

obtaining a first judgment result according to the relation between the first angle difference and the dead zone angle and the hysteresis angle;

calculating a fifth angle difference value of the real-time tracking angle and the target tracking angle;

obtaining a fifth judgment result according to the relationship between the fifth angle difference and the dead zone angle and the lag angle;

and if the first judgment result is not less than 0 and the fifth judgment result is 1, driving the heat collecting groove to rotate within the range of the forward I stage.

7. A heat collecting tank intermittent driving method as claimed in claim 5, wherein said intermittently driving rotation of the heat collecting tank in stages according to said judgment result comprises:

calculating a first angle difference between the real-time tracking angle and the forward first steering angle;

obtaining a first judgment result according to the relation between the first angle difference and the dead zone angle and the hysteresis angle;

calculating a second angle difference between the real-time tracking angle and the forward second steering angle;

obtaining a second judgment result according to the relationship between the second angle difference and the dead zone angle and the lag angle;

calculating a fifth angle difference value of the real-time tracking angle and the target tracking angle;

obtaining a fifth judgment result according to the relationship between the fifth angle difference and the dead zone angle and the lag angle;

and if the first judgment result is-1, the second judgment result is not less than 0, and the fifth judgment result is 1, driving the heat collecting tank to rotate within the range of the forward direction II stage.

8. A heat collecting tank intermittent driving method as claimed in claim 5, wherein said intermittently driving rotation of the heat collecting tank in stages according to said judgment result comprises:

calculating a second angle difference between the real-time tracking angle and the forward second steering angle;

obtaining a second judgment result according to the relationship between the second angle difference and the dead zone angle and the lag angle;

calculating a fifth angle difference value of the real-time tracking angle and the target tracking angle;

obtaining a fifth judgment result according to the relationship between the fifth angle difference and the dead zone angle and the lag angle;

and if the second judgment result is-1 and the fifth judgment result is 1, driving the heat collecting groove to rotate within the range of forward III stage.

9. A heat collecting tank intermittent driving method as claimed in claim 5, wherein said intermittently driving rotation of the heat collecting tank in stages according to said judgment result comprises:

calculating a third angle difference between the real-time tracking angle and the reverse first steering angle;

obtaining a third judgment result according to the relation between the third angle difference value and the dead zone angle and the lag angle;

calculating a fifth angle difference value of the real-time tracking angle and the target tracking angle;

obtaining a fifth judgment result according to the relationship between the fifth angle difference and the dead zone angle and the lag angle;

and if the third judgment result is not greater than 0 and the fifth judgment result is-1, driving the heat collecting groove to rotate within the reverse I-phase range.

10. A heat collecting tank intermittent driving method as claimed in claim 5, wherein said intermittently driving rotation of the heat collecting tank in stages according to said judgment result comprises:

calculating a third angle difference between the real-time tracking angle and the reverse first steering angle;

obtaining a third judgment result according to the relation between the third angle difference value and the dead zone angle and the lag angle;

calculating a fourth angle difference value between the real-time tracking angle and the reverse second steering angle;

obtaining a fourth judgment result according to the relationship between the fourth angle difference value and the dead zone angle and the lag angle;

calculating a fifth angle difference value of the real-time tracking angle and the target tracking angle;

obtaining a fifth judgment result according to the relationship between the fifth angle difference and the dead zone angle and the lag angle;

and if the third judgment result is 1, the fourth judgment result is not more than 0 and the fifth judgment result is-1, driving the heat collecting groove to rotate in a reverse II-stage range.

11. A heat collecting tank intermittent driving method as claimed in claim 5, wherein said intermittently driving rotation of the heat collecting tank in stages according to said judgment result comprises:

calculating a fourth angle difference value between the real-time tracking angle and the reverse second steering angle;

obtaining a fourth judgment result according to the relationship between the fourth angle difference value and the dead zone angle and the lag angle;

calculating a fifth angle difference value of the real-time tracking angle and the target tracking angle;

obtaining a fifth judgment result according to the relationship between the fifth angle difference and the dead zone angle and the lag angle;

and if the fourth judgment result is 1 and the fifth judgment result is-1, driving the heat collecting groove to rotate in a reverse III-stage range.

12. A heat collecting tank intermittent driving method as claimed in claim 5, wherein said intermittently driving rotation of the heat collecting tank in stages according to said judgment result comprises:

calculating a fifth angle difference value of the real-time tracking angle and the target tracking angle;

obtaining a fifth judgment result according to the relationship between the fifth angle difference and the dead zone angle and the lag angle;

and if the fifth judgment result is 0, keeping the heat collecting groove at the current position.

13. An intermittent driving method of a heat collecting tank as recited in claim 1, wherein said dead zone angle range includes 0.3 ° -0.5 °, and said hysteresis angle range includes 0.1 ° -0.2 °.

14. An intermittent drive control device for a heat collection trough for a trough-type photo-thermal solar system, comprising:

a target angle acquisition module: for obtaining a target tracking angle.

The reference angle input module is used for determining a real-time tracking angle, a stage steering angle, a dead zone angle and a lag angle;

the angle difference calculation module is used for calculating the angle difference between the real-time tracking angle and the target tracking angle and the angle difference between the real-time tracking angle and the stage steering angle respectively;

the judgment result output module is used for respectively obtaining a judgment result according to the relation between the angle difference value and the dead zone angle and the hysteresis angle;

and the driving control execution module is used for intermittently driving the heat collection groove to rotate in stages according to the judgment result.

15. A multi-mode control method of a trough photo-thermal solar system, comprising:

determining an operation mode;

determining a target tracking angle according to the operation mode;

-carrying out the intermittent driving method of a heat collecting tank according to any one of claims 1 to 13, according to the target tracking angle.

16. The multi-mode control method of claim 15, wherein the operating mode is an auto-tracking mode, and wherein determining a target tracking angle comprises:

calculating a sun altitude angle and a sun azimuth angle according to the geographical position information of the current time;

judging whether the arrangement direction of the heat collecting grooves is arranged in the east-west direction or in the south-north direction;

and calculating the target tracking angle in real time according to the arrangement direction of the heat collecting grooves.

17. The multi-mode control method according to claim 16, wherein said calculating the target tracking angle in real time according to the arrangement direction of the heat collecting grooves comprises:

when the heat collecting grooves are arranged in the east-west direction,

when the heat collecting grooves are arranged in the north-south direction,

where ρ is_tarTracking an angle for a targetDegree, α_sIs the solar altitude angle, gamma_sIs the solar azimuth.

18. A heat collecting tank multi-operation mode control method as claimed in claim 15, wherein said operation mode is a predetermined tracking mode, said determining a target tracking angle comprises:

and taking a preset debugging tracking angle as a target tracking angle.

19. The multi-mode control method of claim 15, wherein the operating mode is an emergency defocus mode, and wherein determining the target tracking angle comprises:

and taking the sum of the actual tracking angle and the input defocusing deviation angle as a target tracking angle.

20. The multi-mode control method of claim 15, wherein the operating mode is a windbreak mode, and the determining a target tracking angle comprises:

and taking the input wind-proof angle as a target tracking angle.

21. The multi-mode operation control method according to claim 15, wherein the operation mode is a standby mode, and the determining a target tracking angle includes:

and taking the input standby working angle as a target tracking angle.

22. The multi-mode control method of claim 15, wherein the operating mode is a purge mode, and wherein determining a target tracking angle comprises:

and taking the input optimal cleaning angle as a target tracking angle.

23. A multi-mode control device for a trough photo-thermal solar system, comprising:

one or more processors;

storage means for storing one or more programs;

when executed by the one or more processors, cause the one or more processors to implement the method of any one of claims 17-25.

24. A trough photo-thermal solar system, comprising:

a heat collection tank;

the heat conduction oil device is connected with the heat collection groove through an oil pipeline;

the circulating water device is connected with the heat collecting groove through a pipeline;

the hydraulic driving mechanism is connected with the heat collecting groove and drives the heat collecting groove to rotate, and comprises a four-way three-position four-way middle pressure relief type electromagnetic valve;

an intermittent drive control means of a heat collecting tank as claimed in claim 14 or a multi-mode control device as claimed in claim 23, which controls the opening and closing of said four-way three-position four-way intermediate pressure relief type solenoid valve.

25. A computer-readable medium, on which a computer program is stored which, when being executed by a processor, carries out the method according to any one of claims 15-22.

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