Anti-islanding automatic alarm device

Abstract

The invention discloses an anti-islanding automatic alarm device which comprises a power supply control unit, an adjusting switch unit, a voltage sensor, a single-chip microcomputer GPRS module, an alarm module, a mobile device, a single-chip microcomputer and a base. The source control unit, the adjusting switch unit, the voltage sensor, the single-chip microcomputer GPRS module and the alarm module are electrically connected with the single-chip microcomputer. The single-chip microcomputer is used as a core control element, the voltage sensor is used for detecting the voltage of a power grid, whether the power grid is in a maintenance fault state or not is logically judged, a result is uploaded to mobile equipment through the GPRS module to inform related personnel, and when the power grid is powered off, the device is powered by a battery of the device, and the alarm is turned on to give an alarm. Related personnel can conveniently find the position of the disconnecting link; meanwhile, the resettable overvoltage and undervoltage protector serves as a backup power supply to disconnect electrical connection between the distributed power supply and the power grid, so that the function of preventing isolated island operation of the distributed power supply is achieved.

Description

Technical Field

[0001] The invention relates to the technical field of photovoltaic islanding, in particular to an anti-islanding automatic alarm device. Background Art

[0002] At present, manual inspections are mostly used, which requires not only checking the faulty lines but also finding the location of distributed photovoltaic power sources. If one is not familiar with the distributed photovoltaic users and the local geographical environment, finding and operating the isolation switches requires a lot of manpower, material resources and time. Even if new photovoltaic users are not updated in a timely manner, the isolation switches may be missed or misoperated, posing a safety hazard to the power grid inspection and repair personnel. Summary of the invention

[0003] The purpose of the present invention is to provide an anti-islanding automatic alarm device to solve the technical problem that if the distributed photovoltaic users and the local geographical environment are not familiar, it will take a lot of manpower, material resources and time to find and operate the isolating switch. Even if the new photovoltaic users are not updated in time, the isolating switch may be missed or misoperated, which will bring safety hazards to the power grid maintenance and repair personnel.

[0004] To achieve the above object, the present invention provides the following technical solution: an anti-islanding automatic alarm device, comprising a power control unit, an adjustment switch unit, a voltage sensor, a single-chip GPRS module, an alarm module, a mobile device, a single-chip computer and a base, wherein an alarm is installed on the base, the power control unit, the adjustment switch unit, the voltage sensor, the single-chip GPRS module and the alarm module are all electrically connected to the single-chip computer, the single-chip computer is connected to the mobile device via a network signal, and further comprising the following execution steps: S101: The voltage sensor detects the grid voltage and performs a logical judgment on whether the grid is in a maintenance fault state; S102: When the power outage time of the power grid is greater than 2 minutes, the result is uploaded to the mobile device through the GPRS module to notify relevant personnel, and an alarm is issued through the alarm module to facilitate relevant personnel to find the location of the knife switch and close the knife switch; S103: When the power outage time of the power grid is not more than 2 minutes, the voltage sensor continues to detect the power grid voltage.

[0005] Preferably, the power control unit also includes a photovoltaic user, a self-resetting over- and under-voltage protector, a knife switch and an electric switch. The photovoltaic user, the self-resetting over- and under-voltage protector, the knife switch and the electric switch are electrically connected in sequence, and the wire between the knife switch and the electric switch is electrically connected to the regulating switch power supply.

[0006] Preferably, the regulating switch unit is used to regulate the DC power supply into electrical signals of different voltage levels.

[0007] Preferably, the comparison amplifier unit has two input ends which are electrically connected to the output end of the regulating switch unit and the output end of the voltage sensor respectively, so as to compare the pressure electrical signal output by the voltage sensor with the electrical signal set by the regulating switch unit.

[0008] Preferably, the regulating switch unit includes a plurality of voltage-dividing resistors connected in series, the power control unit is grounded through the plurality of voltage-dividing resistors connected in series, and each adjacent voltage-dividing resistor is connected to one of the input terminals of the comparison amplifier unit through a lead with a regulating switch.

[0009] Preferably, the comparison and amplification unit includes a comparator and a transistor, the two input ends of the comparator are respectively connected to the output end of the regulating switch unit and the output end of the voltage sensor, the output end of the comparator is connected to the base of the transistor, and the collector of the transistor is connected to the power control unit.

[0010] Preferably, the alarm module also includes an alarm and a buzzer.

[0011] Preferably, the outer periphery of the alarm is sleeved with a fixed cover, the fixed cover is fixedly connected to the base, fixed rods are fixedly connected to both sides of the middle part of the lower surface of the base, clamping plates are sleeved on the two fixed rods, the clamping plates are slidably connected to the fixed rods, a fixed sleeve is sleeved on one end of the fixed rod close to the clamping plate, a screw is inserted on one side of the fixed sleeve, the screw is threadedly connected to the fixed sleeve, and a power switch button and a sound and light button are fixedly installed on one side of the base.

[0012] Preferably, one side of the fixing sleeve is rotatably connected to a fixing frame via a bearing, two screws are inserted into the upper surface of the fixing frame, and a thread groove between two adjacent threads on the screw rod is slidably connected to one end of the screw.

[0013] Preferably, one end of the fixing rod is threadedly connected to a limiting block.

[0014] Compared with the prior art, the present invention has the following beneficial effects: 1. The present invention uses a single-chip microcomputer as the core control element, detects the grid voltage through a voltage sensor, performs logical judgment on whether the grid is in a maintenance fault state, and uploads the result to a mobile device through a GPRS module to notify relevant personnel. When the grid is out of power, the device uses its own battery to power the device and turns on the alarm to alarm, making it convenient for relevant personnel to find the location of the knife switch; at the same time, the self-resetting over- and under-voltage protector serves as a backup power supply to disconnect the electrical connection between the distributed power supply and the grid, thereby preventing the distributed power supply from operating in an isolated island.

[0015] 2. The present invention mainly informs the relevant staff of the specific locations of all distributed photovoltaic power sources that need to be opened when the power grid is out of power for maintenance or planned power outages, and gives relevant prompts to ensure the safety of the staff and reduce the time wasted in finding the location of the knife switch. For the knife switch that the staff neglects to operate due to negligence, it also provides certain backup protection. The device can greatly reduce the time wasted in disconnecting the knife switch of the distributed power source, improve the efficiency of power grid power outage maintenance and rescue, and improve the reliability of power supply.

[0016] 3. The present invention can protect the alarm by providing a fixed cover, thereby extending the service life of the alarm. When installing the alarm base, the clamping plate can be pushed upward by sliding the fixing sleeve, so that the clamping plate and the base can be squeezed against each other, and the base can be fixedly installed in any position, which is convenient for installation and disassembly of the alarm. By providing a fixing frame and screws, it is easy to rust for the screw that has been placed in the external environment for a long time. During maintenance, by rotating the screw or rotating the fixing frame, one end of the screw can slide in the thread groove between two adjacent threads, so that the rust residue on the screw can be removed, making it easy to open the screw. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 It is a schematic diagram of the structure of the execution system of the present invention; Figure 2 This is a schematic diagram of the structure of the comparison and amplification unit system of the present invention; Figure 3 This is a schematic diagram of the structure of the power control unit system of the present invention; Figure 4 This is a schematic diagram of the installation structure of the alarm device of the present invention; Figure 5 for Figure 4 Enlarged structural diagram at A in the middle.

[0018] In the figure: 1. base; 2. fixing cover; 3. alarm; 4. power switch button; 5. sound and light button; 6. clamping plate; 7. fixing sleeve; 8. fixing rod; 9. limit block; 10. screw; 11. fixing frame; 12. screw. DETAILED DESCRIPTION

[0019] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0020] See also Figure 1-5The present invention provides a technical solution: an anti-islanding automatic alarm device, comprising a power control unit, an adjustment switch unit, a voltage sensor, a single-chip GPRS module, an alarm module, a mobile device, a single-chip computer and a base 1, wherein an alarm 3 is installed on the base 1, the power control unit, the adjustment switch unit, the voltage sensor, the single-chip GPRS module and the alarm module are all electrically connected to the single-chip computer, and the single-chip computer is connected to the mobile device through a network signal, and further comprising the following execution steps: S101: The voltage sensor detects the grid voltage and performs a logical judgment on whether the grid is in a maintenance fault state; S102: When the power outage time of the power grid is greater than 2 minutes, the result will be uploaded to the mobile device through the GPRS module to notify relevant personnel, and an alarm will be sounded through the alarm module to facilitate relevant personnel to find the location of the knife switch and close the knife switch.

[0021] S103: When the power outage time of the power grid is not more than 2 minutes, the voltage sensor continues to detect the power grid voltage.

[0022] When in use, the single-chip microcomputer is used as the core control element, and the grid voltage is detected through the voltage sensor. Logical judgment is made whether the grid is in a maintenance fault state, and the result is uploaded to the mobile device through the GPRS module to notify relevant personnel. When the grid is out of power, the device uses its own battery for power supply and turns on the alarm to facilitate relevant personnel to find the location of the knife switch; at the same time, the self-resetting over- and under-voltage protector acts as a backup power supply to disconnect the electrical connection between the distributed power supply and the grid, thereby preventing the distributed power supply from operating in an isolated island.

[0023] The device is mainly used to inform relevant staff of the specific locations of all distributed photovoltaic power sources that need to be opened when the power grid is out of power for maintenance or planned power outages, and to provide relevant prompts to ensure the safety of the staff and reduce the time wasted in finding the location of the knife switch. It also provides certain backup protection for knife switches that are accidentally operated by staff. The device can greatly reduce the time wasted in disconnecting the knife switch of distributed power sources, improve the efficiency of power grid outage maintenance and rescue, and improve the reliability of power supply.

[0024] Among them, the power control unit also includes a photovoltaic user, a self-resetting over- and under-voltage protector, a knife switch and an electric switch. The photovoltaic user, the self-resetting over- and under-voltage protector, the knife switch and the electric switch are electrically connected in sequence, and the wire between the knife switch and the electric switch is electrically connected to the regulating switch power supply.

[0025] The regulating switch unit is used to regulate the DC power supply into electrical signals of different voltage levels.

[0026] It also includes a comparison amplifier unit, whose two input ends are electrically connected to the output end of the regulating switch unit and the output end of the voltage sensor respectively, for comparing the pressure electrical signal output by the voltage sensor with the electrical signal set by the regulating switch unit.

[0027] Among them, the regulating switch unit includes a plurality of voltage-dividing resistors connected in series, the power control unit is grounded through the plurality of voltage-dividing resistors connected in series, and two adjacent voltage-dividing resistors are connected to one of the input terminals of the comparison amplifier unit through a lead with a regulating switch.

[0028] Among them, the comparison and amplification unit includes a comparator and a transistor, the two input ends of the comparator are respectively connected to the output end of the regulating switch unit and the output end of the voltage sensor, the output end of the comparator is connected to the base of the transistor, and the collector of the transistor is connected to the power control unit.

[0029] When in use, the comparator and the triode are provided to improve the test safety of the power grid verification system, timely and automatically alarm dangerous situations, take self-protection measures, and effectively protect the safety of maintenance personnel and maintenance power grid equipment. Among them, the alarm module also includes an alarm 3 and a buzzer.

[0030] Among them, the outer periphery of the alarm 3 is sleeved with a fixed cover 2, and the fixed cover 2 is fixedly connected to the base 1. Fixed rods 8 are fixedly connected to both sides of the middle part of the lower surface of the base 1, and clamping plates 6 are sleeved on the two fixed rods 8. The clamping plates 6 are slidably connected to the fixed rods 8. A fixed sleeve 7 is sleeved on one end of the fixed rod 8 close to the clamping plate 6, and a screw 10 is inserted on one side of the fixed sleeve 7. The screw 10 is threadedly connected to the fixed sleeve 7. A power switch button 4 and a sound and light button 5 are fixedly installed on one side of the base 1.

[0031] The fixed cover 2 can protect the alarm and extend the service life of the alarm 3. When installing the alarm base, the clamping plate 6 can be pushed upward by sliding the fixing sleeve 7, so that the clamping plate 6 and the base 1 can be squeezed against each other, and the base 1 can be fixedly installed in any position, which is convenient for the installation and disassembly of the alarm 3.

[0032] One side of the fixing sleeve 7 is rotatably connected to a fixing frame 11 via a bearing, two screws 12 are inserted into the upper surface of the fixing frame 11, and a thread groove between two adjacent threads on the screw rod 10 is slidably connected to one end of the screw 12.

[0033] By providing the fixing frame 11 and the screw 12, the screw 10 placed in the external environment for a long time is easy to rust. During maintenance, by rotating the screw 10 or rotating the fixing frame 11, one end of the screw 12 can slide in the thread groove between two adjacent threads, so that the rust residue on the screw 10 can be removed, making it easier to open the screw 10.

[0034] One end of the fixing rod 8 is threadedly connected to the limiting block 9 .

[0035] Working principle: When in use, the single chip microcomputer is used as the core control element, and the voltage sensor is used to detect the grid voltage. It makes a logical judgment on whether the power grid is in a maintenance fault state, and uploads the result to the mobile device through the GPRS module to notify the relevant personnel. When the power grid is out of power, the device uses its own battery for power supply and turns on the alarm to alarm, so that the relevant personnel can find the location of the knife switch; at the same time, the self-resetting over- and under-voltage protector disconnects the electrical connection between the distributed power supply and the power grid as a backup power supply, so as to prevent the distributed power supply from operating in an isolated island. The device is mainly used to inform the relevant staff of the specific location of all distributed photovoltaic power sources that need to open the knife switch when the power grid is out of power for maintenance or a planned power outage, and make relevant prompts to ensure the safety of the staff and reduce the time wasted in finding the knife switch location. It also provides certain backup protection for the knife switch that is missed by the staff due to negligence. This device can greatly reduce the risk of disconnecting the distributed photovoltaic power source. The time wasted by the power switch is reduced, the efficiency of power grid power outage maintenance and rescue is improved, and the power supply reliability is improved. The fixed cover 2 can protect the alarm and extend the service life of the alarm 3. When installing the alarm base, the sliding fixed sleeve 7 can push the clamping plate 6 to move upward, so that the clamping plate 6 and the base 1 can be squeezed against each other, and the base 1 can be fixedly installed in any position, which is convenient for the installation and disassembly of the alarm 3. The fixing frame 11 and the screw 12 are provided, and the screw 10 placed in the external environment for a long time is easy to rust. During maintenance, by rotating the screw 10 or rotating the fixing frame 11, one end of the screw 12 can slide in the thread groove between two adjacent threads, so that the rust residue on the screw 10 can be removed, which is convenient for opening the screw 10.

Claims

1. An anti-islanding automatic alarm device, comprising a power control unit, a regulating switch unit, a voltage sensor, a single-chip GPRS module, an alarm module, a mobile device, a single-chip and a base (1), wherein an alarm (3) is installed on the base (1), characterized in that: The source control unit, the regulating switch unit, the voltage sensor, the single-chip GPRS module and the alarm module are all electrically connected to the single-chip, and the single-chip is connected to the mobile device via a network signal, and further includes the following execution steps: S101: The voltage sensor detects the grid voltage and performs a logical judgment on whether the grid is in a maintenance fault state; S102: When the power outage time of the power grid is greater than 2 minutes, the result is uploaded to the mobile device through the GPRS module to notify relevant personnel, and an alarm is issued through the alarm module to facilitate relevant personnel to find the location of the knife switch and close the knife switch; S103: When the power outage time of the power grid is not more than 2 minutes, the voltage sensor continues to detect the power grid voltage.

2. The anti-islanding automatic alarm device according to claim 1 is characterized in that: The power control unit also includes a photovoltaic user, a self-resetting over- and under-voltage protector, a knife switch and an electric switch. The photovoltaic user, the self-resetting over- and under-voltage protector, the knife switch and the electric switch are electrically connected in sequence, and the wire between the knife switch and the electric switch is electrically connected to the regulating switch power supply.

3. The anti-islanding automatic alarm device according to claim 1 is characterized in that: The regulating switch unit is used to regulate the DC power supply into electrical signals of different voltage levels.

4. The anti-islanding automatic alarm device according to claim 1 is characterized in that: It also includes a comparison amplifier unit, the two input ends of which are electrically connected to the output end of the regulating switch unit and the output end of the voltage sensor respectively, for comparing the pressure electrical signal output by the voltage sensor with the electrical signal set by the regulating switch unit.

5. The anti-islanding automatic alarm device according to claim 4 is characterized in that: The regulating switch unit includes a plurality of voltage-dividing resistors connected in series, the power control unit is grounded through the plurality of voltage-dividing resistors connected in series, and two adjacent voltage-dividing resistors are connected to one of the input terminals of the comparison amplifier unit through a lead with a regulating switch.

6. The anti-islanding automatic alarm device according to claim 4 is characterized in that: The comparison and amplification unit includes a comparator and a transistor. The two input ends of the comparator are respectively connected to the output end of the regulating switch unit and the output end of the voltage sensor. The output end of the comparator is connected to the base of the transistor. The collector of the transistor is connected to the power control unit.

7. The anti-islanding automatic alarm device according to claim 1 is characterized in that: The alarm module also includes an alarm (3) and a buzzer.

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