An intelligent photovoltaic box-type substation

Abstract

The present invention discloses an intelligent photovoltaic box-type substation, comprising a photovoltaic box-type transformer, an energy storage station, a control module, a mains power system, and a cooling module. The invention is characterized in that the photovoltaic box-type transformer is connected to the cooling module, the control module, and the energy storage station; the control module is connected to the mains power system, the energy storage station, and the cooling module; the photovoltaic box-type transformer is used to convert solar energy and feed it back to the energy storage station; the energy storage station is used to store the converted electric energy; the cooling module is used to cool the photovoltaic box-type transformer; and the control module is used to ensure the emergency storage capacity of the energy storage station and convert the power supply signal of the cooling module.

Description

Technical Field

[0001] The present invention relates to the technical field of photovoltaic box-type transformers, and in particular to an intelligent photovoltaic box-type transformer substation. Background Art

[0002] The photovoltaic box-type substation converts solar energy and then feeds it back to the energy storage station connected to it. The energy storage station stores energy during the day and supplies electricity at night to achieve the purpose of energy saving and environmental protection. At the same time, the energy storage station can supply electricity when any equipment in the mains power system is damaged due to weather or equipment aging. Because the internal working module of the box-type substation will produce power loss during operation, the loss will be converted into heat. The temperature of the working module itself will increase while the temperature inside the box will increase. The external environment and transformer will also further increase the temperature inside the box. Therefore, the cooling system needs to intervene to cool down. It takes a certain amount of time to repair or replace equipment in the mains power system, during which time it needs to be powered by the energy storage station. Therefore, an intelligent photovoltaic box-type substation is proposed. When the mains power system is normal, it can reduce the power consumption of the mains power system after ensuring the emergency storage capacity of the energy storage station. It can also meet the power needs of users during the period when any equipment in the mains power system is damaged due to weather or equipment aging and is under repair and replacement. Summary of the invention

[0003] In view of the above technical problems, the purpose of the present invention is to provide an intelligent photovoltaic box-type substation, including a photovoltaic box transformer, an energy storage station, a control module, a mains power system, and a cooling module, characterized in that the photovoltaic box transformer is connected to the cooling module, the control module, and the energy storage station, and the control module is connected to the mains power system, the energy storage station, and the cooling module. The photovoltaic box transformer is used to convert solar energy and feed it back to the energy storage station, the energy storage station is used to store the converted electric energy, the cooling module is used to cool the photovoltaic box transformer, and the control module is used to ensure the emergency storage capacity of the energy storage station and convert the power supply signal of the cooling module.

[0004] Furthermore, the control module includes a third resistor R3, a fourth resistor R4, a seventh resistor R7, a second operational amplifier U2, and a first connector P1, wherein the in-phase end of the second operational amplifier U2 is connected to one end of the fourth resistor R4, the inverting end of the second operational amplifier U2 is connected to one end of the seventh resistor R7 and the first connector P1, the output end of the second operational amplifier U2 is connected to the other end of the seventh resistor R7 and one end of the third resistor R3, and the other end of the fourth resistor R4 is connected to the ground end.

[0005] Furthermore, the control module also includes a first resistor R1, a second resistor R2, an eighth resistor R8, a ninth resistor R9, a first operational amplifier U1, and a third operational amplifier U3, wherein one end of the first resistor R1 is connected to the same-phase end of the first operational amplifier U1, the inverting end of the first operational amplifier U1 is connected to the other end of the third resistor R3 and one end of the second resistor R2, the output end of the first operational amplifier U1 is connected to the other end of the second resistor R2 and the same-phase end of the third operational amplifier U3, the inverting end of the third operational amplifier U3 is connected to one end of the eighth resistor R8 and one end of the ninth resistor R9, the other end of the eighth resistor R8 is connected to the power supply, and the other end of the first resistor R1 and the other end of the ninth resistor R9 are connected to the ground.

[0006] Furthermore, the control module also includes an eleventh resistor R11, a thirteenth resistor R13, a first MOS tube Q1, a second connector P2, a third connector P3, and a second diode D2, wherein the source of the first MOS tube Q1 is connected to the third connector P3, the gate of the first MOS tube Q1 is connected to the output end of the third operational amplifier U3, the drain of the first MOS tube Q1 is connected to one end of the eleventh resistor R11 and the anode of the second diode D2, the cathode of the second diode D2 is connected to one end of the thirteenth resistor R13 and the second connector P2, and the other end of the eleventh resistor R11 and the other end of the thirteenth resistor R13 are connected to the ground.

[0007] Furthermore, the control module also includes a twelfth resistor R12, a fourteenth resistor R14, a sixteenth resistor R16, a fourth operational amplifier U4, a second MOS tube Q2, a fourth connector P4, and a first diode D1, one end of the sixteenth resistor R16 is connected to the power supply, the other end of the sixteenth resistor R16 is connected to one end of the fourteenth resistor R14 and the in-phase end of the fourth operational amplifier U4, the inverting end of the fourth operational amplifier U4 is connected to the third connector P3, the output end of the fourth operational amplifier U4 is connected to the output end of the third operational amplifier U3 and the gate of the second MOS tube Q2, the drain of the second MOS tube Q2 is connected to the fourth connector P4, the source of the second MOS tube Q2 is connected to one end of the twelfth resistor R12 and the anode of the first diode D1, the cathode of the first diode D1 is connected to the cathode of the second diode D2, and the other end of the twelfth resistor R12 and the other end of the fourteenth resistor R14 are connected to the ground.

[0008] Furthermore, the control module also includes an auxiliary control unit, which includes a fifth resistor R5, a sixth resistor R6, a fifteenth resistor R15, a fifth operational amplifier U5, and a sixth connector P6. The in-phase end of the fifth operational amplifier U5 is connected to one end of the fifteenth resistor R15 and the sixth connector P6, the inverting end of the fifth operational amplifier U5 is connected to one end of the fifth resistor R5, the output end of the fifth operational amplifier U5 is connected to the other end of the fifth resistor R5 and one end of the sixth resistor R6, the other end of the sixth resistor R6 is connected to the first connector P1, and the other end of the fifteenth resistor R15 is connected to the ground.

[0009] Furthermore, the control module also includes a third MOS tube Q3 and a fifth connector P5, wherein the gate of the third MOS tube Q3 is connected to the fifth connector P5, the source of the third MOS tube Q3 is connected to the anode of the second diode D2, and the drain of the third MOS tube Q3 is connected to the ground terminal.

[0010] Furthermore, the control module further includes a tenth resistor R10, one end of the tenth resistor R10 is connected to the gate of the second MOS tube Q2, and the other end of the tenth resistor R10 is connected to the ground.

[0011] Furthermore, the control module also includes a seventeenth resistor R17, one end of the seventeenth resistor R17 is connected to the fifth connector P5, and the other end of the seventeenth resistor R17 is connected to the ground.

[0012] Furthermore, the ninth resistor R9 may be an adjustable resistor.

[0013] The beneficial effects of the present invention compared with the prior art are:

[0014] The power supply signal of the cooling module of the photovoltaic box transformer can be controlled based on the set emergency storage energy. When the mains power system is normal, the power consumption of the mains power system can be reduced after ensuring the emergency storage energy. When any equipment in the mains power system is damaged due to weather or equipment aging and is under repair or replacement, sufficient power can be supplied to users. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the following briefly introduces the prior art and the drawings required for use in the embodiments. 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 creative work.

[0016] Figure 1 The present invention provides an overall structural diagram.

[0017] Figure 2 This is a schematic diagram of the control module structure provided by the present invention.

[0018] Figure 3 This is a schematic diagram of the structure of the auxiliary control unit in the control module provided by the present invention. DETAILED DESCRIPTION

[0019] In order to make the objects and advantages of the present invention more clearly understood, the present invention is specifically described below in conjunction with embodiments. It should be understood that the following text is only used to describe one or several specific implementations of the present invention, and does not strictly limit the scope of protection specifically requested by the present invention.

[0020] The present invention discloses an intelligent photovoltaic box-type substation, comprising a photovoltaic box-type transformer, an energy storage station, a control module, a mains power system, and a cooling module. The invention is characterized in that the photovoltaic box-type transformer is connected to the cooling module, the control module, and the energy storage station; the control module is connected to the mains power system, the energy storage station, and the cooling module; the photovoltaic box-type transformer is used to convert solar energy and feed it back to the energy storage station; the energy storage station is used to store the converted electric energy; the cooling module is used to cool the photovoltaic box-type transformer; and the control module is used to ensure the emergency storage capacity of the energy storage station and convert the power supply signal of the cooling module.

[0021] Specifically, the control module includes a third resistor R3, a fourth resistor R4, a seventh resistor R7, a second operational amplifier U2, and a first connector P1. The in-phase end of the second operational amplifier U2 is connected to one end of the fourth resistor R4, the inverting end of the second operational amplifier U2 is connected to one end of the seventh resistor R7 and the first connector P1, the output end of the second operational amplifier U2 is connected to the other end of the seventh resistor R7 and one end of the third resistor R3, and the other end of the fourth resistor R4 is connected to the ground end.

[0022] Specifically, the control module also includes a first resistor R1, a second resistor R2, an eighth resistor R8, a ninth resistor R9, a first operational amplifier U1, and a third operational amplifier U3, wherein one end of the first resistor R1 is connected to the same-phase end of the first operational amplifier U1, the inverting end of the first operational amplifier U1 is connected to the other end of the third resistor R3 and one end of the second resistor R2, the output end of the first operational amplifier U1 is connected to the other end of the second resistor R2 and the same-phase end of the third operational amplifier U3, the inverting end of the third operational amplifier U3 is connected to one end of the eighth resistor R8 and one end of the ninth resistor R9, the other end of the eighth resistor R8 is connected to the power supply, and the other end of the first resistor R1 and the other end of the ninth resistor R9 are connected to the ground.

[0023] Specifically, the control module also includes an eleventh resistor R11, a thirteenth resistor R13, a first MOS tube Q1, a second connector P2, a third connector P3, and a second diode D2, wherein the source of the first MOS tube Q1 is connected to the third connector P3, the gate of the first MOS tube Q1 is connected to the output end of the third operational amplifier U3, the drain of the first MOS tube Q1 is connected to one end of the eleventh resistor R11 and the anode of the second diode D2, the cathode of the second diode D2 is connected to one end of the thirteenth resistor R13 and the second connector P2, and the other end of the eleventh resistor R11 and the other end of the thirteenth resistor R13 are connected to the ground.

[0024] Specifically, the control module also includes a twelfth resistor R12, a fourteenth resistor R14, a sixteenth resistor R16, a fourth operational amplifier U4, a second MOS tube Q2, a fourth connector P4, and a first diode D1. One end of the sixteenth resistor R16 is connected to the power supply, the other end of the sixteenth resistor R16 is connected to one end of the fourteenth resistor R14 and the in-phase end of the fourth operational amplifier U4, the inverting end of the fourth operational amplifier U4 is connected to the third connector P3, the output end of the fourth operational amplifier U4 is connected to the output end of the third operational amplifier U3 and the gate of the second MOS tube Q2, the drain of the second MOS tube Q2 is connected to the fourth connector P4, the source of the second MOS tube Q2 is connected to one end of the twelfth resistor R12 and the anode of the first diode D1, the cathode of the first diode D1 is connected to the cathode of the second diode D2, and the other end of the twelfth resistor R12 and the other end of the fourteenth resistor R14 are connected to the ground.

[0025] Specifically, the control module also includes an auxiliary control unit, which includes a fifth resistor R5, a sixth resistor R6, a fifteenth resistor R15, a fifth operational amplifier U5, and a sixth connector P6. The fifth operational amplifier U5 has a common-phase end connected to one end of the fifteenth resistor R15 and the sixth connector P6, an inverting end of the fifth operational amplifier U5 is connected to one end of the fifth resistor R5, an output end of the fifth operational amplifier U5 is connected to the other end of the fifth resistor R5 and one end of the sixth resistor R6, the other end of the sixth resistor R6 is connected to the first connector P1, and the other end of the fifteenth resistor R15 is connected to the ground.

[0026] Specifically, the control module also includes a third MOS tube Q3 and a fifth connector P5, wherein the gate of the third MOS tube Q3 is connected to the fifth connector P5, the source of the third MOS tube Q3 is connected to the anode of the second diode D2, and the drain of the third MOS tube Q3 is connected to the ground terminal.

[0027] Specifically, the control module further includes a tenth resistor R10, one end of the tenth resistor R10 is connected to the gate of the second MOS tube Q2, and the other end of the tenth resistor R10 is connected to the ground.

[0028] Specifically, the control module further includes a seventeenth resistor R17, one end of the seventeenth resistor R17 is connected to the fifth connector P5, and the other end of the seventeenth resistor R17 is connected to the ground.

[0029] Specifically, the ninth resistor R9 may be an adjustable resistor.

[0030] See attached Figure 1 , Attachment Figure 2 , Attachment Figure 3In this embodiment, the photovoltaic box-type substation converts solar energy and then feeds it back to the energy storage station connected thereto. The energy storage station stores energy during the day and supplies power at night to achieve the purpose of energy saving and environmental protection. The energy storage signal of the energy storage station is fed back to the control module through the first connector P1. The signal of the first connector P1 is fed back to the output end of the second operational amplifier U2 through the seventh resistor R7 to form a negative feedback connection. The fourth resistor R4 is a pull-down resistor at the in-phase end of the second operational amplifier U2. The output end signal of the second operational amplifier U2 is fed back to the inverting end of the first operational amplifier U1 through the third resistor R3. The output end of the first operational amplifier U1 is negatively feedback connected to the inverting end of the first operational amplifier U1 through the second resistor R2. The first resistor R1 is a pull-down resistor at the output end of the first operational amplifier U1. The power supply signal passes through the eighth resistor R8 and the ninth resistor R9 to the grounding loop. The signal amplitude between the eighth resistor R8 and the ninth resistor R9 is the signal amplitude of the emergency storage energy of the energy storage station. The signal between the seventh resistor R7 and the eighth resistor R8 is fed back to the inverting end of the third operational amplifier U3. Because the internal working module of the box-type transformer station will generate power loss during operation, the loss will be converted into heat. The temperature of the internal working module will increase while the temperature inside the box will increase. The weather will also further increase the temperature inside the box. Therefore, the cooling module needs to intervene to cool down. When the energy storage energy reserve reaches the emergency storage energy setting amplitude, the third operational amplifier U3 outputs, and the output terminal signal of the third operational amplifier U3 is fed back to the gate of the first MOS tube Q1 , the gate of the second MOS tube Q2, the voltage difference between the gate of the second MOS tube Q2 and the source of the second MOS tube Q2 is higher than the conduction threshold, the second MOS tube Q2 is turned on, the drain of the second MOS tube Q2 is connected to the energy storage station through the fourth connector P4, the power supply signal of the energy storage station passes through the drain of the second MOS tube Q2, the source of the second MOS tube Q2, and the twelfth resistor R12 to the ground end loop, the signal between the source of the second MOS tube Q2 and the twelfth resistor R12 passes through the first diode D1 and the thirteenth resistor R13 to the ground end loop, the signal between the first diode D1 and the thirteenth resistor R13 is fed back to the cooling module through the second connector P2, so as to reduce the energy storage speed of the energy storage station after the energy storage station reaches the emergency energy storage value, and the energy storage station is turned into the cooling module. Power supply, reduce the power consumption of the mains system, because the energy storage station needs to supply power to ensure the user's power demand when any equipment in the mains system is damaged due to weather or equipment aging, and it takes a certain amount of time to repair or replace the equipment in the mains system, during which time the energy storage station needs to supply power. Therefore, the energy storage station needs to have a certain amount of energy reserve during the day to cope with the maintenance of the mains system. The energy remaining from the emergency reserve can be used to feed back power supply energy to the cooling module of the box transformer. When the energy storage station does not reach the emergency energy storage value, the second MOS tube Q2 is turned off, the voltage difference between the gate of the first MOS tube Q1 and the source of the first MOS tube Q1 is lower than the conduction threshold, the first MOS tube Q1 is turned on, and the source of the first MOS tube Q1 is connected to the mains system through the third connector P3.The power supply signal of the mains system passes through the source of the first MOS tube Q1, the drain of the first MOS tube Q1, and the eleventh resistor R11 to the ground end loop. The signal between the drain of the first MOS tube Q1 and the eleventh resistor R11 passes through the second diode D2 and the thirteenth resistor R13 to the ground end loop. The signal between the second diode D2 and the thirteenth resistor R13 is fed back to the cooling module through the second connector P2. The tenth resistor R10 is used to release the parasitic capacitance of the gate of the first MOS tube Q1 and the gate of the second MOS tube Q2. In this way, when the energy storage station does not reach the emergency storage energy setting amplitude during the day, the cooling module is powered by the mains system. The power supply signal passes through the sixteenth resistor R16 and the fourteenth resistor R1 4 to the grounding end loop, the signal between the fourteenth resistor R14 and the sixteenth resistor R16 is fed back to the in-phase end of the fourth operational amplifier U4, and the power supply signal of the mains system is fed back to the inverting end of the fourth operational amplifier U4 through the third connector P3. When the mains system fails and cannot supply power to the user, the fourth operational amplifier U4 outputs, and the output end signal of the fourth operational amplifier U4 is fed back to the gate of the first MOS tube Q1 and the gate of the second MOS tube Q2. The first MOS tube Q1 is turned off and the second MOS tube Q2 is turned on. In this way, when the mains system fails, no matter whether the energy storage station energy storage reaches the emergency energy storage setting amplitude, the energy storage station supplies power to the cooling module. A number of auxiliary control units are arranged in the control module. The control unit is used to feedback the energy storage signal of the energy storage unit in the energy storage station. The auxiliary control unit is set based on the number of energy storage units. The energy storage signal of the energy storage unit is fed back to the in-phase end of the fifth operational amplifier U5 through the sixth connector P6. The fifteenth resistor R15 is a pull-down resistor at the in-phase end of the fifth operational amplifier U5. The output end of the fifth operational amplifier U5 is negatively feedback connected to the inverting end of the fifth operational amplifier U5 through the fifth resistor R5. The output end signal of the fifth operational amplifier U5 is fed back to the first connector P1 on the control module through the sixth resistor R6, so that the control module can obtain the overall energy storage signal of the energy storage station. A photosensor is provided on the photovoltaic substation, and the photosensor signal is fed back through the fifth connector P5 To the control module, the fifth connector P5 end is high level during the day, and the signal at the fifth connector P5 end is low level at night. The fifth connector P5 signal is fed back to the gate of the third MOS tube Q3. At night, the voltage difference between the gate of the third MOS tube Q3 and the source of the third MOS tube Q3 is lower than the conduction threshold, and the third MOS tube Q3 is turned on. The signal between the drain of the first MOS tube Q1 and the eleventh resistor R11 passes through the source of the third MOS tube Q3 and the drain of the third MOS tube Q3 to the grounding end loop, thereby disconnecting the power supply signal of the mains system to the cooling module at night, preventing the mains system and the energy storage station from simultaneously supplying power to the cooling module when the energy storage station supplies power to the user and causes its output energy to be lower than the set amplitude of the emergency energy storage. ,

[0031] It will be apparent to those skilled in the art that the invention is not limited to the details of the exemplary embodiments described above and that the invention can be implemented in other specific forms without departing from the spirit or essential features of the invention. Therefore, the embodiments should be considered in all respects as exemplary and non-limiting, and the scope of the invention is defined by the appended claims rather than the foregoing description, and it is intended that all variations within the meaning and scope of the equivalent elements of the claims be included in the invention. Any marking in a claim should not be considered as limiting the claim to which it relates.

Claims

1. An intelligent photovoltaic box-type substation, comprising a photovoltaic box-type substation, an energy storage station, a control module, a mains power system, and a cooling module, characterized in that: The photovoltaic box transformer is connected to the cooling module, the control module, and the energy storage station. The control module is connected to the mains system, the energy storage station, and the cooling module. The photovoltaic box transformer is used to convert solar energy and feed it back to the energy storage station. The energy storage station is used to store the converted electric energy. The cooling module is used to cool the photovoltaic box transformer. The control module is used to ensure the emergency storage capacity of the energy storage station and convert the power supply signal of the cooling module. The control module includes a third resistor, a fourth resistor, a seventh resistor, a second operational amplifier, and a first connector, wherein the in-phase end of the second operational amplifier is connected to one end of the fourth resistor, the inverting end of the second operational amplifier is connected to one end of the seventh resistor and the first connector, the output end of the second operational amplifier is connected to the other end of the seventh resistor and one end of the third resistor, and the other end of the fourth resistor is connected to the ground end; The control module also includes an eleventh resistor, a thirteenth resistor, a first MOS transistor, a second connector, a third connector, and a second diode, wherein the source of the first MOS transistor is connected to the third connector, the gate of the first MOS transistor is connected to the output end of the third operational amplifier, the drain of the first MOS transistor is connected to one end of the eleventh resistor and the anode of the second diode, the cathode of the second diode is connected to one end of the thirteenth resistor and the second connector, and the other end of the eleventh resistor and the other end of the thirteenth resistor are connected to the ground end; The control module also includes a first resistor, a second resistor, an eighth resistor, a ninth resistor, a first operational amplifier, and a third operational amplifier, wherein one end of the first resistor is connected to the same phase end of the first operational amplifier, the inverting end of the first operational amplifier is connected to the other end of the third resistor and one end of the second resistor, the output end of the first operational amplifier is connected to the other end of the second resistor and the same phase end of the third operational amplifier, the inverting end of the third operational amplifier is connected to one end of the eighth resistor and one end of the ninth resistor, the other end of the eighth resistor is connected to the power supply, and the other end of the first resistor and the other end of the ninth resistor are connected to the ground; the signal amplitude between the eighth resistor and the ninth resistor is the signal amplitude of the emergency storage energy of the energy storage station; The control module also includes a twelfth resistor, a fourteenth resistor, a sixteenth resistor, a fourth operational amplifier, a second MOS tube, a fourth connector, and a first diode, wherein one end of the sixteenth resistor is connected to a power supply, the other end of the sixteenth resistor is connected to one end of the fourteenth resistor and the in-phase end of the fourth operational amplifier, the inverting end of the fourth operational amplifier is connected to the third connector, the output end of the fourth operational amplifier is connected to the output end of the third operational amplifier and the gate of the second MOS tube, the drain of the second MOS tube is connected to the fourth connector, the source of the second MOS tube is connected to one end of the twelfth resistor and the anode of the first diode, the cathode of the first diode is connected to the cathode of the second diode, and the other end of the twelfth resistor and the other end of the fourteenth resistor are connected to the ground end; The control module also includes an auxiliary control unit, which includes a fifth resistor, a sixth resistor, a fifteenth resistor, a fifth operational amplifier, and a sixth connector. The in-phase end of the fifth operational amplifier is connected to one end of the fifteenth resistor and the sixth connector, the inverting end of the fifth operational amplifier is connected to one end of the fifth resistor, the output end of the fifth operational amplifier is connected to the other end of the fifth resistor and one end of the sixth resistor, the other end of the sixth resistor is connected to the first connector, and the other end of the fifteenth resistor is connected to the ground end; The control module further includes a third MOS tube and a fifth connector, wherein the gate of the third MOS tube is connected to the fifth connector, the source of the third MOS tube is connected to the anode of the second diode, and the drain of the third MOS tube is connected to the ground terminal; The control module further includes a tenth resistor, one end of the tenth resistor is connected to the gate of the second MOS tube, and the other end of the tenth resistor is connected to the ground.

2. The intelligent photovoltaic box-type substation according to claim 1 is characterized in that: The control module further includes a seventeenth resistor, one end of the seventeenth resistor is connected to the fifth connector, and the other end of the seventeenth resistor is connected to the ground.

3. The intelligent photovoltaic box-type substation according to claim 1 is characterized in that: The ninth resistor is an adjustable resistor.

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