A solar thermal storage mode logic interlocking system and control method

Abstract

The present invention discloses a solar thermal heat storage mode logic interlocking system and control method, including a steam generator, a heat storage device, a heat absorber, a fan 1, a fan 2, a valve 1, a valve 2, a valve 3, a valve 4, a valve 5, a valve 6 and a valve 7. The existing system can only realize the switching of four working conditions by manually switching valves, and there are misoperations, manpower consumption and inability to achieve the timeliness of switching during the operation process. The logic control of the present invention can ensure 100% accuracy in the switching process, and timely switching under corresponding working conditions, and the operation duty officer only needs to monitor the operation of the automatic logic and the switching results.

Description

Technical Field

[0001] The present invention relates to the field of photothermal heat storage mode logic interlocking, and in particular to a photothermal heat storage mode logic interlocking system. Background Art

[0002] Thermal equipment in a solar thermal system includes collectors, heat storage, and steam generators. Depending on the operating conditions and allowable requirements, at least the following working modes can be combined:

[0003] 1) Direct heat release mode;

[0004] 2) Direct heat storage mode;

[0005] 3) Heat storage heat release mode;

[0006] 4) Maximum output mode.

[0007] In order to realize the heat storage and heat release of the heat storage module, as well as the need to release heat together with the heat absorber, the above four working modes require a total of 2 high-temperature fans, 2 medium-temperature large-diameter valves (200℃), and 5 high-temperature large-diameter valves (500℃).

[0008] However, the above four working modes have no logical connection, the valve scheduling needs to be adjusted individually, and the valve selection corresponding to the actual demand is not timely. The remote transmission DCS points of 2 high-temperature fans, 2 medium-temperature large-diameter valves and 5 high-temperature large-diameter valves are scattered and not systematic, and logical interaction has not yet been achieved. Summary of the invention

[0009] In view of the above problems, the present invention provides a solar thermal energy storage mode logic interlocking system to solve the above problems.

[0010] The present invention is achieved through the following technical solutions:

[0011] A solar thermal heat storage mode logic interlocking system comprises a steam generator, a heat storage device, a heat absorber, a fan 1, a fan 2, a valve 1, a valve 2, a valve 3, a valve 4, a valve 5, a valve 6 and a valve 7, wherein the output of the steam generator comprises two paths, one path is connected to an input of the fan 1 through a valve 6, and the other path is connected to an input of the heat absorber through the fan 2, the input of the steam generator comprises two paths, one path is connected to an output of the heat storage device through a valve 3, and the other path is connected to an output of the heat absorber through a valve 2, and the other output of the heat storage device is connected to another input of the fan 1 through a valve 4, the output of the fan 1 comprises two paths, one path is connected to another input of the heat absorber through a valve 7, and the other path is connected to an input of the heat storage device through a valve 5, and the other input of the heat storage device is connected to another output of the heat absorber through a valve 1, wherein a PLC controller is also included, and the fan 1, the fan 2, the valve 1, the valve 2, the valve 3, the valve 4, the valve 5, the valve 6 and the valve 7 are respectively connected to the PLC controller.

[0012] Further, the PLC controller controls fan 1, fan 2, valve 1, valve 2, valve 3, valve 4, valve 5, valve 6 and valve 7 to perform four photothermal system working modes, and the photothermal system working modes include:

[0013] Direct heat release mode: Fan 2 is turned on, wherein valve 1, valve 2, and valve 3 are respectively in contact with 500°C hot air, and the steam generator, fan 2, heat absorber, and valve 2 form a closed-loop control;

[0014] Direct heat storage mode: open valve 1, valve 4, valve 7 and fan 1, wherein valve 1, valve 2 and valve 5 are in contact with 500°C hot air respectively, and the heat storage device, valve 4, fan 1, valve 7, heat absorber and valve 1 form a closed-loop control;

[0015] Heat storage device heat release mode: open valve 3, valve 5, valve 6 and fan 1, wherein valve 2, valve 3 and valve 4 are in contact with 500°C hot air respectively, and the steam generator, valve 6, fan 1, valve 5, heat storage device and valve 3 form a closed-loop control;

[0016] Maximum heat release mode: open valve 2, valve 3, valve 5, valve 6, fan 1 and fan 2, wherein valve 1, valve 2, valve 3 and valve 4 are in contact with 500°C hot air respectively, and the steam generator, valve 6, fan 1, valve 5, heat storage device and valve 3 form a first layer of closed-loop control, and the steam generator, fan 2, heat absorber and valve 2 form a second layer of closed-loop control.

[0017] A solar thermal energy storage mode logic interlocking control method includes the following operation modes:

[0018] Switch from direct heat release mode to direct heat storage mode: switch 4 valves, make a logical association between valve 2 and valve 1, and take 1 out of 3;

[0019] Switch the direct heat storage mode to the heat storage release mode: switch 6 valves, and make a logical association between valve 1 and valve 3 and take 1 out of 3;

[0020] The heat storage device heat release mode is switched to the maximum heat release mode: switch 1 valve, and the logic association 2 takes 1;

[0021] Switch the maximum heat release mode to the direct heat release mode: switch 4 valves, and make a logical association between valve 2 and valve 2∪valve 3, with 3 taking 1.

[0022] Furthermore, the switching conditions of the four operating modes are specifically as follows:

[0023] Direct heat release mode:

[0024] a1. When the illumination parameter DNI satisfies the operation of the photothermal mirror field and the steam generated during operation is superheated steam;

[0025] a2. When the heat storage device fails to operate;

[0026] c3. The heat storage capacity of the heat storage device has reached its peak value;

[0027] Direct heat storage mode:

[0028] b1. When the illumination parameter DNI satisfies the operation of the photothermal mirror field and the steam generated during operation is superheated steam;

[0029] b2. When the electric valve at the steam outlet of the solar thermal system fails to open;

[0030] b3. When there is no steam user in the solar thermal system;

[0031] Heat storage device heat release mode:

[0032] c1. When the solar thermal system fails to collect heat;

[0033] c2. When there are steam users in the solar thermal system;

[0034] c3. When the illumination parameter DNI cannot meet the requirements for the operation of the photothermal mirror field;

[0035] Maximum heat release mode:

[0036] d1. When the illumination parameter DNI satisfies the operation of the photothermal mirror field and the steam generated during the operation is superheated steam;

[0037] d2. The heat storage device has no faults;

[0038] d3. When the direct heat release mode cannot meet the steam user demand;

[0039] d4. When the heat storage device’s heat release mode cannot meet the steam user’s demand.

[0040] Furthermore, the direct heat release mode is switched to the direct heat storage mode, specifically including:

[0041] A1. When valve 1 is taken, the three relays of the logic control valve power supply are set to be energized non-simultaneously, directly opening valves 4 and 7, and connecting the heat storage device, fan 1 and heat absorber in series at the same time;

[0042] A2. When valve 2 is taken, the remaining 6 relays are set to be powered on at the same time by logic control, and the steam generator, heat absorber and fan 2 are connected in series to activate the direct heat release mode;

[0043] A3. When valve 1 / valve 2 is not selected and a logic "0" signal is output, the valve power supply is cut off, the relay is cut off, and a fault alarm is issued.

[0044] Further, the direct heat storage mode is switched to the heat storage heat release mode, wherein valve 1 and valve 3 are logically associated with each other, specifically including:

[0045] B1. When valve 1 is taken, the control mode is the same as switching from direct heat release mode to direct heat storage mode.

[0046] B2. When valve 3 is taken, the three relays of the logic control valve power supply are set to be non-simultaneously energized, directly opening valves 5 and 6, and simultaneously connecting the steam generator, fan 1 and the heat storage in series to activate the heat storage heat release mode;

[0047] B3. When valve 1 / valve 3 is not used and a logic "0" signal is output, the valve power supply is cut off, the relay is cut off, and a fault alarm is issued.

[0048] Furthermore, the heat storage device heat release mode is switched to a maximum heat release mode, specifically including:

[0049] C1. When valve 2 is selected, the logic of adding valve 2∪valve 3 is different from that of direct heat release mode. The four relays of the logic control valve power supply are set to be non-simultaneously energized, directly opening valve 3, valve 5 and valve 6, and activating the steam generator, fan 1, fan 2, heat storage device and heat absorber in series at the same time;

[0050] C2. When valve 2 is not taken, the three relays of the logic control valve power supply are set to be energized non-simultaneously, directly opening valves 5 and 6, and connecting the steam generator, fan 1 and heat storage in series to activate the heat storage heat release mode.

[0051] Furthermore, the maximum heat release mode is switched to the direct heat release mode, specifically including:

[0052] D1. When valve 2 is selected, it is the same as direct heat release mode;

[0053] D2. When valve 2∪valve 3, the same as the maximum heat release mode;

[0054] D3. When valve 2 is not taken or valve 2∪valve 3 is not taken, a logic "0" signal is output, the valve power supply is cut off, the relay is cut off, and a fault alarm is issued.

[0055] Beneficial effects of the present invention:

[0056] The existing system can only switch between four working conditions by manually opening and closing valves. There are misoperations, waste of manpower, and failure to achieve timely switching during the operation. Logical control can ensure 100% accuracy in the switching process, and timely switching under corresponding working conditions. In addition, the operator on duty only needs to monitor the operation of the automatic logic and the switching results. BRIEF DESCRIPTION OF THE DRAWINGS

[0057] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings required for use in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative labor.

[0058] Figure 1 A system structure diagram of a solar thermal energy storage mode logic interlocking system proposed in an embodiment of the present invention;

[0059] Figure 2 A system structure flow chart of a direct heat release mode of a solar thermal storage mode logic interlocking system proposed in an embodiment of the present invention;

[0060] Figure 3 A system structure diagram flow chart of a direct heat storage mode of a solar thermal heat storage mode logic interlocking system proposed in an embodiment of the present invention;

[0061] Figure 4 A system structure diagram flow chart of a heat storage device heat release mode of a solar thermal heat storage mode logic interlocking system proposed in an embodiment of the present invention;

[0062] Figure 5 This is a system structure flow chart of the maximum heat release mode of a solar thermal storage mode logic interlocking system proposed in an embodiment of the present invention. DETAILED DESCRIPTION

[0063] In order to make the objectives, technical solutions and advantages of the present invention more clearly understood, the present invention is further described in detail below in conjunction with embodiments and drawings. The exemplary embodiments of the present invention and their description are only used to explain the present invention and are not intended to limit the present invention.

[0064] Example 1

[0065] like Figure 1 , This embodiment proposes a solar thermal heat storage mode logic interlocking system, including a steam generator, a heat storage device, a heat absorber, a fan 1, a fan 2, a valve 1, a valve 2, a valve 3, a valve 4, a valve 5, a valve 6 and a valve 7, wherein the output of the steam generator includes two routes, one route is connected to one input of the fan 1 through the valve 6, and the other route is connected to one input of the heat absorber through the fan 2, the input of the steam generator includes two routes, one route is connected to one output of the heat storage device through the valve 3, and the other route is connected to one output of the heat absorber through the valve 2, and the other output of the heat storage device is connected to another input of the fan 1 through the valve 4, the output of the fan includes two routes, one route is connected to another input of the heat absorber through the valve 7, and the other route is connected to one input of the heat storage device through the valve 5, and the other input of the heat storage device is connected to another output of the heat absorber through the valve 1, wherein a PLC controller is also included, and the fan 1, the fan 2, the valve 1, the valve 2, the valve 3, the valve 4, the valve 5, the valve 6 and the valve 7 are respectively connected to the PLC controller.

[0066] Further, the PLC controller controls fan 1, fan 2, valve 1, valve 2, valve 3, valve 4, valve 5, valve 6 and valve 7 to perform four photothermal system working modes, and the photothermal system working modes include:

[0067] Direct heat release mode: Fan 2 is turned on, wherein valve 1, valve 2, and valve 3 are in contact with 500°C hot air respectively, and the steam generator, fan 2, and heat absorber form a closed-loop control;

[0068] Direct heat storage mode: open valve 1, valve 4, valve 7 and fan 1, wherein valve 1, valve 2 and valve 5 are in contact with 500°C hot air respectively, and the heat storage device, valve 4, fan 1, valve 7, heat absorber and valve 1 form a closed-loop control;

[0069] Heat storage device heat release mode: open valve 3, valve 5, valve 6 and fan 1, wherein valve 2, valve 3 and valve 4 are in contact with 500°C hot air respectively, and the steam generator, valve 6, fan 1, valve 5, heat storage device and valve 3 form a closed-loop control;

[0070] Maximum heat release mode: open valve 2, valve 3, valve 5, valve 6, fan 1 and fan 2, wherein valve 1, valve 2, valve 3 and valve 4 are in contact with 500°C hot air respectively, and the steam generator, valve 6, fan 1, valve 5 heat storage device and valve 3 form the first layer of closed-loop control, and the steam generator, fan 2, heat absorber and valve 2 form the second layer of closed-loop control.

[0071] The specific implementation principle process of this embodiment is as follows:

[0072] Switching conditions corresponding to the four operating modes

[0073] Direct heat release mode: 1. When the illumination parameter DNI meets the operation of the photothermal mirror field, and the steam generated by the operation is superheated steam 2. When the heat storage device fails to operate. 3. The heat storage device has reached its peak.

[0074] Direct heat storage mode: 1. When the illumination parameter DNI meets the operation of the photothermal mirror field, and the steam generated by the operation is superheated steam; 2. When the electric valve of the steam outlet of the photothermal system fails and cannot be opened; 3. When there is no steam user in the photothermal system

[0075] Heat storage heat release mode: 1. When the solar thermal system mirror field reports a fault and cannot collect heat. 2. When the solar thermal system has steam users. 3. When the light parameter DNI cannot meet the operation of the solar thermal mirror field.

[0076] Maximum heat release mode: 1. When the illumination parameter DNI meets the operation of the photothermal mirror field, and the steam generated by the operation is superheated steam, 2. The heat storage device has no faults. 3. When the direct heat release mode cannot meet the demand of steam users, 4. When the heat storage device heat release mode cannot meet the demand of steam users

[0077] Switch 4 valves from direct heat release to direct heat storage mode. Valve 2 is logically associated with valve 1, and 3 is selected as 1. When valve 1 is selected, the logic controls the valve power supply 3 relays to be non-simultaneously energized, directly open valve 4 and valve 7, and simultaneously connect the heat storage device, fan 1 and heat absorber in series. When valve 2 is selected, the logic controls the remaining 6 relays to be energized simultaneously, and simultaneously connect the steam generator, heat absorber, and fan 2 in series to activate the direct release mode. When valve 1 or valve 2 is not selected, the output command is 0, and the valve power supply is de-energized and the relay is de-energized. Fault alarm.

[0078] Switch 6 valves in the direct heat storage to heat storage release mode. Valve 1 point is logically associated with valve 3 point, and 3 is selected as 1. When valve 1 point is selected, the control mode is consistent with the above direct release and direct storage mode. When valve 3 point is selected, the 3 relays of the logic control valve power supply are set to non-simultaneous power-on, directly open valve 5 and valve 6, and simultaneously connect the steam generator, fan 1 and heat storage in series to activate the heat storage release mode. When valve 1 point or valve 3 point is not selected, the output command is 0, and the valve power supply is off and the relay is off. Fault alarm.

[0079] When the heat storage device releases heat to the maximum heat release mode, switch one valve, and the logic association 2 is 1. When the valve 2 point is taken, the logic of valve 2∪valve 3 point is added, which is different from the direct release mode. The logic control valve power supply 4 relays are set to be non-simultaneously energized, directly open valve 3, valve 5 and valve 6, and simultaneously connect the steam generator, fan 1, fan 2, heat storage device and heat absorber in series to activate. Without valve 2 point, the logic control valve power supply 3 relays are set to be non-simultaneously energized, directly open valve 5 and valve 6, and simultaneously connect the steam generator, fan 1 and heat storage device in series to activate the heat storage device release mode.

[0080] Switch 4 valves from maximum heat release to direct heat release mode. Valve 2 point is logically associated with valve 2∪valve 3 point, and 3 is selected as 1. When valve 2 point is selected, it is the same as direct release mode. When valve 2∪valve 3 point is selected, it is the same as maximum heat release mode. When valve 2 point is not selected or valve 2∪3 point, the output command is 0, and the valve power supply is off and the relay is off. Fault alarm.

[0081] Example 2

[0082] On the basis of Example 1, this example further proposes a solar thermal energy storage mode logic interlocking control method, including the following operation modes:

[0083] Switch from direct heat release mode to direct heat storage mode: switch 4 valves, make a logical association between valve 2 and valve 1, and take 1 out of 3;

[0084] Switch the direct heat storage mode to the heat storage release mode: switch 6 valves, and make a logical association between valve 1 and valve 3 and take 1 out of 3;

[0085] The heat storage device heat release mode is switched to the maximum heat release mode: switch 1 valve, and the logic association 2 takes 1;

[0086] Switch the maximum heat release mode to the direct heat release mode: switch 4 valves, and make a logical association between valve 2 and valve 2∪valve 3, with 3 taking 1.

[0087] Furthermore, the switching conditions of the four operating modes are specifically as follows:

[0088] Direct heat release mode:

[0089] a1. When the illumination parameter DNI satisfies the operation of the photothermal mirror field and the steam generated during operation is superheated steam;

[0090] a2. When the heat storage device fails to operate;

[0091] c3. The heat storage capacity of the heat storage device has reached its peak value;

[0092] Direct heat storage mode:

[0093] b1. When the illumination parameter DNI satisfies the operation of the photothermal mirror field and the steam generated during operation is superheated steam;

[0094] b2. When the electric valve at the steam outlet of the solar thermal system fails to open;

[0095] b3. When there is no steam user in the solar thermal system;

[0096] Heat storage device heat release mode:

[0097] c1. When the solar thermal system fails to collect heat;

[0098] c2. When there are steam users in the solar thermal system;

[0099] c3. When the illumination parameter DNI cannot meet the requirements for the operation of the photothermal mirror field;

[0100] Maximum output mode:

[0101] d1. When the illumination parameter DNI satisfies the operation of the photothermal mirror field and the steam generated during the operation is superheated steam;

[0102] d2. The heat storage device has no faults;

[0103] d3. When the direct heat release mode cannot meet the steam user demand;

[0104] d4. When the heat storage device’s heat release mode cannot meet the steam user’s demand.

[0105] Furthermore, the direct heat release mode is switched to the direct heat storage mode, specifically including:

[0106] A1. When valve 1 is taken, the three relays of the logic control valve power supply are set to be energized non-simultaneously, directly opening valves 4 and 7, and connecting the heat storage device, fan 1 and heat absorber in series at the same time.

[0107] A2. When valve 2 is taken, the remaining 6 relays of the logic control are set to be energized at the same time, and the steam generator, heat absorber and fan 2 are connected in series to activate the direct heat release mode.

[0108] A3. When valve 1 / valve 2 is not selected and a logic "0" signal is output, the valve power supply is cut off, the relay is cut off, and a fault alarm is issued.

[0109] Further, the direct heat storage mode is switched to the heat storage heat release mode, wherein valve 1 and valve 3 are logically associated with each other, specifically including:

[0110] B1. When valve 1 is taken, the control mode is the same as switching from direct heat release mode to direct heat storage mode.

[0111] B2. When valve 3 is taken, the three relays of the logic control valve power supply are set to be energized non-simultaneously, directly opening valves 5 and 6, and at the same time connecting the steam generator, fan 1 and the heat storage in series to activate the heat storage heat release mode.

[0112] B3. When valve 1 / valve 3 is not used and a logic "0" signal is output, the valve power supply is cut off, the relay is cut off, and a fault alarm is issued.

[0113] Furthermore, the heat storage device heat release mode is switched to a maximum heat release mode, specifically including:

[0114] C1. When valve 2 is selected, the difference from the direct heat release mode logic is to add valve 2∪valve 3, the logic control valve power supply 4 relays are set to be energized non-simultaneously, directly open valve 3, valve 5 and valve 6, and activate the steam generator, fan 1, fan 2, heat storage device and heat absorber in series at the same time.

[0115] C2. When valve 2 is not taken, the three relays of the logic control valve power supply are set to be energized non-simultaneously, directly opening valves 5 and 6, and connecting the steam generator, fan 1 and heat storage in series to activate the heat storage heat release mode.

[0116] Furthermore, the maximum heat release switching mode to the direct heat release mode specifically includes:

[0117] D1. When valve 2 is selected, it is the same as direct heat release mode.

[0118] D2. When valve 2∪valve 3, it is the same as the maximum heat release mode.

[0119] D3. When valve 2 is not taken or valve 2∪valve 3 is not taken, a logic "0" signal is output, the valve power supply is cut off, the relay is cut off, and a fault alarm is issued.

[0120] The above shows and describes the basic principles and main features of the present invention and the advantages of the present invention. It should be understood by those skilled in the art that the present invention is not limited to the above embodiments. The above embodiments and descriptions are only for explaining the principles of the present invention. Without departing from the spirit and scope of the present invention, the present invention may have various changes and improvements, which fall within the scope of the present invention to be protected. The scope of protection of the present invention is defined by the attached claims and their equivalents.

Claims

1. A solar thermal energy storage mode logic interlocking system, characterized in that: It includes a steam generator, a heat storage device, a heat absorber, a fan 1, a fan 2, a valve 1, a valve 2, a valve 3, a valve 4, a valve 5, a valve 6 and a valve 7. The output of the steam generator includes two routes, one route is connected to one input of the fan 1 through the valve 6, and the other route is connected to one input of the heat absorber through the fan 2. The input of the steam generator includes two routes, one route is connected to one output of the heat storage device through the valve 3, and the other route is connected to one output of the heat absorber through the valve 2. The other output of the heat storage device is connected to another input of the fan 1 through the valve 4. The output of the fan 1 includes two routes, one route is connected to another input of the heat absorber through the valve 7, and the other route is connected to one input of the heat storage device through the valve 5. The other input of the heat storage device is connected to another output of the heat absorber through the valve 1. A PLC controller is also included. The fan 1, the fan 2, the valve 1, the valve 2, the valve 3, the valve 4, the valve 5, the valve 6 and the valve 7 are respectively connected to the PLC controller.

2. A solar thermal energy storage mode logic interlocking system according to claim 1, characterized in that: The PLC controller controls fan 1, fan 2, valve 1, valve 2, valve 3, valve 4, valve 5, valve 6 and valve 7 to perform four photothermal system working modes, and the photothermal system working modes include: Direct heat release mode: Turn on fan 2, wherein valve 1, valve 2, and valve 3 are in contact with 500°C hot air respectively, and the steam generator, fan 2, heat absorber, and valve 2 form a closed-loop control; Direct heat storage mode: open valve 1, valve 4, valve 7 and fan 1, wherein valve 1, valve 2 and valve 5 are in contact with 500°C hot air respectively, and the heat storage device, valve 4, fan 1, valve 7, heat absorber and valve 1 form a closed-loop control; Heat storage device heat release mode: open valve 3, valve 5, valve 6 and fan 1, wherein valve 2, valve 3 and valve 4 are in contact with 500°C hot air respectively, and the steam generator, valve 6, fan 1, valve 5, heat storage device and valve 3 form a closed-loop control; Maximum heat release mode: open valve 2, valve 3, valve 5, valve 6, fan 1 and fan 2, wherein valve 1, valve 2, valve 3 and valve 4 are in contact with 500°C hot air respectively, and the steam generator, valve 6, fan 1, valve 5, heat storage device and valve 3 form a first layer of closed-loop control, and the steam generator, fan 2, heat absorber and valve 2 form a second layer of closed-loop control.

3. A method for logical interlocking control of a solar thermal energy storage mode, characterized in that: The following operation modes are included: Switching from direct heat release mode to direct heat storage mode specifically includes: A1. When valve 1 is taken, the three relays of the logic control valve power supply are set to be non-simultaneously energized, directly opening valves 4 and 7, and connecting the heat storage device, fan 1 and heat absorber in series at the same time; A2. When valve 2 is taken, the remaining 6 relays are set to be powered on at the same time by logic control, and the steam generator, heat absorber and fan 2 are connected in series to activate the direct heat release mode; A3. When valve 1 / valve 2 is not used and a logic "0" signal is output, the valve power supply is cut off, the relay is cut off, and a fault alarm is issued; The switching from direct heat storage mode to heat storage device heat release mode specifically includes: B1. When valve 1 is taken, the control mode is the same as switching from direct heat release mode to direct heat storage mode. B2. When valve 3 is taken, the three relays of the logic control valve power supply are set to be non-simultaneously energized, directly opening valves 5 and 6, and simultaneously connecting the steam generator, fan 1 and the heat storage in series to activate the heat storage heat release mode; B3. When valve 1 / valve 3 is not used and a logic "0" signal is output, the valve power supply is cut off, the relay is cut off, and a fault alarm is issued; The heat storage device heat release mode is switched to the maximum heat release mode specifically including: C1. When valve 2 is selected, the logic of adding valve 2∪valve 3 is different from that of direct heat release mode. The four relays of the logic control valve power supply are set to be non-simultaneously energized, directly opening valve 3, valve 5 and valve 6, and activating the steam generator, fan 1, fan 2, heat storage device and heat absorber in series at the same time; C2. When valve 2 is not taken, the three relays of the logic control valve power supply are set to be non-simultaneously energized, directly opening valves 5 and 6, and simultaneously connecting the steam generator, fan 1 and the heat storage in series to activate the heat storage heat release mode; The maximum heat release mode is switched to the direct heat release mode: specifically including: D1. When valve 2 is selected, it is the same as direct heat release mode; D2. When valve 2∪valve 3, the same as the maximum heat release mode; D3. When valve 2 is not taken or valve 2∪valve 3 is not taken, a logic "0" signal is output, the valve power supply is cut off, the relay is cut off, and a fault alarm is issued.

4. A method for controlling a solar thermal energy storage mode logic interlock according to claim 3, characterized in that: The switching conditions of the four operating modes are specifically as follows: Direct heat release mode: a1. When the illumination parameter DNI satisfies the operation of the photothermal mirror field and the steam generated during the operation is superheated steam; a2. When the heat storage device fails to operate; c3. The heat storage capacity of the heat storage device has reached its peak value; Direct heat storage mode: b1. When the illumination parameter DNI satisfies the operation of the photothermal mirror field and the steam generated during operation is superheated steam; b2. When the electric valve at the steam outlet of the solar thermal system fails and cannot be opened; b3. When there is no steam user in the solar thermal system; Heat storage device heat release mode: c1. When the solar thermal system fails to collect heat; c2. When there are steam users in the solar thermal system; c3. When the illumination parameter DNI cannot meet the requirements for the operation of the photothermal mirror field; Maximum heat release mode: d1. When the illumination parameter DNI meets the requirements for the operation of the photothermal mirror field and the steam generated during the operation is superheated steam; d2. The heat storage device has no faults; d3. When the direct heat release mode cannot meet the steam user demand; d4. When the heat storage device’s heat release mode cannot meet the steam user’s demand.

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