SVG fence protection circuit, SVG fence protection system and photovoltaic power station

Abstract

The utility model relates to an SVG fence protection circuit and system and a photovoltaic power station, and the circuit comprises a power transmission line, one end of which is connected with a bus of the photovoltaic power station; the SVG unit is connected with the other end of the power transmission line; the switch unit is arranged on the power transmission line, the switch unit is used for controlling connection and disconnection between the bus and the SVG unit, and the switch unit comprises a first switch, a second switch and an electronic switch module; wherein the electronic switch module comprises a control module and an electronic lock, the electronic switch module is electrically connected with the SVG unit to obtain a power supply, and the control module collects on-off states of the first switch and the second switch and outputs a control signal to the electronic lock to control opening or closing of the electronic lock. According to the utility model, electric shock accidents can be effectively avoided, and when the SVG unit is electrified and the electronic lock is forcibly opened, the control module can send an unlocking signal to a dispatching duty room in an alarm mode to trigger on-site alarm sound, so that the personal safety of on-site operation and maintenance personnel is effectively guaranteed.

Description

TECHNICAL FIELD

[0001] The utility model relates to photovoltaic power plant technical field especially is a kind of SVG fence protection circuit, system and photovoltaic power plant. BACKGROUND

[0002] With the promotion of clean energy and the rapid development of power grid, photovoltaic power plant has been vigorously developed, and photovoltaic power plant is a kind of solar energy, through special materials such as crystalline silicon plate and inverter and electronic components, the power generation system is connected with power grid and sends power to power grid.‌ The static var generator of photovoltaic power plant, namely SVG (Static Var Generator), which dynamically compensates inductive reactive power and capacitive reactive power, can dynamically compensate large-scale fast-changing instantaneous reactive power, and is the development direction of modern reactive compensation device. In the prior art, SVG fence adopts grid and mechanical lock or five-prevention lock combination form.

[0003] The defect of prior art is that the safety protection performance is poor, SVG fence using mechanical lock or five-prevention lock can be opened from outside by operating personnel, but when SVG control cabinet is still in the state of electrification, but when the operating personnel do not know, the mechanical lock or five-prevention lock is opened recklessly to enter the fence inside, there is the risk of electric shock, so the existing SVG fence has high safety risk. UTILITY MODEL CONTENT

[0004] Therefore, the utility model wants to overcome the insufficient in prior art, provide a kind of SVG fence protection circuit, system and photovoltaic power plant, can effectively guarantee the personal safety of field operating personnel.

[0005] To solve the above technical problems, the utility model provides a kind of SVG fence protection circuit, including,

[0006] Power transmission line, one end is connected with the busbar of photovoltaic power plant;

[0007] SVG unit, which is connected with the other end of the power transmission line;

[0008] Switch unit is arranged in the power transmission line, and the switch unit is used to control the on-off between the busbar and the SVG unit, and the switch unit includes first switch, second switch and electronic switch module;Wherein, the electronic switch module includes control module and mechanical part, the mechanical part includes electronic lock and electronic lock control module, the electronic switch module is electrically connected with the control cabinet of the SVG unit to obtain power supply, the control module collects the on-off state of the first switch and the second switch, and outputs control signal to the electronic lock control module, to control the on-off of the electronic lock.

[0009] In one embodiment of the utility model, the control module includes a first terminal and a second terminal, the first terminal is used for detecting the opening and closing state of the first switch, and the second terminal is used for detecting the opening and closing state of the second switch.

[0010] In one embodiment of the utility model, the utility model further includes a grounding switch module, the grounding switch module includes a grounding switch and a lightning arrester, and the grounding switch and the lightning arrester are connected in parallel to the power transmission line.

[0011] In one embodiment of the utility model, the electronic switch module further includes a soft start resistor, and the soft start resistor is connected in parallel to the power transmission line.

[0012] In one embodiment of the utility model, the electronic switch module further includes an indicator light assembly, the indicator light assembly includes a first indicator light and a second indicator light, the first indicator light is set to a first color, and the second indicator light is set to a second color.

[0013] In one embodiment of the utility model, the first switch includes a circuit breaker, and the second switch includes a disconnecting switch.

[0014] In one embodiment of the utility model, the SVG unit includes a reactor and a reactive power compensation module, and the reactor is arranged between the reactive power compensation module and the electronic switch module.

[0015] The utility model further provides an SVG fence protection system, including fence unit and SVG fence protection circuit as described above, and the electronic lock of SVG fence protection circuit is installed in the fence unit.

[0016] In one embodiment of the utility model, the fence unit includes a fence body and a door structure, and the electronic lock is used for opening or closing the door structure.

[0017] The utility model further provides a photovoltaic power station, and the photovoltaic power station includes at least one SVG fence protection system as described above.

[0018] The above technical scheme of the utility model has the following advantages compared with the prior art:

[0019] The utility model relates to a kind of SVG fence protection circuit, it is equipped with transmission line, SVG unit and switch unit, SVG unit is set to the end of transmission line, switch unit is set between SVG unit and the bus of photovoltaic power station, to control the circuit on-off of SVG unit.Switch unit includes first switch, second switch and electronic switch module, electronic switch module includes control module and electronic lock, control module is connected with first switch, second switch to detect the opening and closing state of first switch and second switch, to control the opening or shutdown of electronic lock.Based on this design, when SVG unit is powered off, the electronic lock is installed in the entity fence of SVG unit, only then can the entity fence be opened, only then can the area where SVG unit is located be entered by operating personnel, when SVG unit is electrified, electronic lock is closed, so as to prohibit the opening of entity fence, and when SVG unit is electrified, control module can send the unlocking signal to dispatch duty room in alarm mode, so as to remind on-duty personnel, thereby avoiding electric shock accident, effectively guaranteeing the personal safety of on-site operating personnel. BRIEF DESCRIPTION OF DRAWINGS

[0020] In order to make the content of the utility model more easily understood clearly, the utility model is further explained in detail below according to the specific embodiments of the utility model and in conjunction with the drawings, wherein.

[0021] Figure 1 It is the circuit connection structure schematic diagram of preferred embodiment of the utility model.

[0022] Figure 2 It is the schematic diagram of control module of preferred embodiment of the utility model.

[0023] Description of the drawings reference sign: 1, transmission line;2, bus;31, first switch;32, second switch;33, electronic lock;34, first grounding resistor;35, electric reactor;36, reactive compensation module;40, grounding switch;41, lightning arrester. DETAILED DESCRIPTION

[0024] The utility model is further explained below in conjunction with the drawings and specific embodiments, so that those skilled in the art can better understand the utility model and can be implemented, but the embodiment is not as the limitation of the utility model. Example one

[0025] Refer to Figure 1 And Figure 2 As shown in the utility model discloses a kind of SVG fence protection circuit, including transmission line 1, the one end of the transmission line 1 is connected with the bus 2 of photovoltaic power station.

[0026] The SVG fence protection circuit further comprises an SVG unit connected to the other end of the power transmission line 1.

[0027] Further, the SVG fence protection circuit further comprises a switch unit arranged on the power transmission line 1, which is used to control the on-off between the bus 2 and the SVG unit. The electronic switch module comprises a first switch 31, a second switch 32 and a mechanical part comprising an electronic lock and an electronic lock control module.

[0028] The electronic switch module is electrically connected to the control cabinet of the SVG unit to obtain a power supply. It should be noted that the electronic switch module is connected to the physical fence outside the SVG unit, and the electronic lock 33 is assembled on the physical fence to control the opening or closing of the physical fence.

[0029] The control module collects the on-off state of the first switch 31 and the second switch 32, and outputs a control signal to the electronic lock control module to control the on-off of the electronic lock 33.

[0030] Specifically, when the first switch 31 and the second switch 32 are both in a closed state, the SVG unit is in a conduction state with the bus, so that the SVG unit is live, the electronic lock 33 is closed, and the electronic lock is prohibited to be opened, so that the physical fence is prohibited to be opened.

[0031] When any one of the first switch 31 or the second switch 32 is in an open state, or the first switch 31 and the second switch 32 are both in an open state, the SVG unit is in a power-off state, the control module acquires the power-off signal of the SVG unit, and controls the electronic lock 33 to be allowed to be opened, so that the physical fence is allowed to be opened, and the maintenance personnel can enter.

[0032] Of course, when the SVG unit is live, if the maintenance personnel tries to forcibly open the electronic lock, the control module will output an alarm signal to the dispatching duty room at this time.

[0033] The electronic lock 33 includes but is not limited to a motorized disconnecting switch.

[0034] It can be known that the SVG fence protection circuit to be protected by the utility model is provided with a power transmission line, an SVG unit and a switch unit, the SVG unit is arranged at the end of the power transmission line, the switch unit is arranged between the SVG unit and the bus of the photovoltaic power station to control the circuit on-off of the SVG unit. The switch unit comprises a first switch, a second switch and an electronic switch module, the electronic switch module comprises a control module and an electronic lock, the control module is connected with the first switch and the second switch to detect the opening and closing states of the first switch and the second switch, thereby controlling the opening or closing of the electronic lock. Based on the design, the electronic lock is installed on the physical fence of the SVG unit, the physical fence can be opened only when the SVG unit is powered off, the operation and maintenance personnel can enter the area where the SVG unit is located, when the SVG unit is live, the electronic lock is closed, thereby prohibiting the opening of the physical fence, and when the operation and maintenance personnel forcibly open the electronic lock when the SVG unit is live, the control module can send the unlocking signal to the dispatching duty room in the form of an alarm, thereby reminding the on-duty personnel, so that the electric shock accident is avoided, and the personal safety of the on-site operation and maintenance personnel is effectively ensured.

[0035] In combination Figure 2 As shown in the figure, the control module comprises a first terminal S2 and a second terminal S4 for receiving input signals, the first terminal S2 is electrically connected with the first switch 31 to detect the on-off state of the first switch 31, and the second terminal S4 is electrically connected with the second switch 32 to detect the on-off state of the second switch 32.

[0036] As a preferred embodiment, the electronic switch module further comprises an indicator light assembly, the indicator light assembly is electrically connected with the control module, the indicator light assembly comprises a first indicator light and a second indicator light, the first indicator light is lit when the SVG unit is live, and the second indicator light is lit when the SVG unit is powered off, the first indicator light is set to a first color, and the second indicator light is set to a second color. In the embodiment, the first color is red, and the second color is green.

[0037] The control module further comprises an output terminal module, the output terminal module comprises a first COM terminal, a first NO terminal, a second NO terminal, a K2 terminal and a K4 terminal, wherein the first COM terminal represents a normally closed state, the SVG unit is powered off, the electronic lock 33 is disconnected, the physical fence is allowed to be opened, and the personnel entering will not alarm; the first NO terminal represents a normally open state, the SVG unit is in a power-on state, the electronic lock 33 is closed, and normal work is performed; the second NO terminal also represents a normally open state, but if the operating personnel forcibly open the lock at this time, an alarm signal is output to remind the on-duty personnel.

[0038] The K2 end is used for connecting a pilot lamp assembly to output a pilot signal, and the K4 end is used for connecting a buzzer to emit a sound for alarm.

[0039] As a preferred embodiment, the first switch 31 includes but is not limited to a circuit breaker, and the second switch 32 includes but is not limited to a disconnecting switch.

[0040] In order to release electrostatic charge of the loop when maintaining and repairing the equipment, and in order to ensure the personal safety of the operating personnel when repairing the power-off, the SVG fence protection circuit further comprises a grounding switch module, the grounding switch module comprises a grounding switch 40 and a lightning arrester 41, and the grounding switch 40 and the lightning arrester 41 are connected in parallel to the power transmission line 1. The grounding switch module can withstand a certain time of current in abnormal conditions, such as short circuit, but does not pass through the load current in normal working conditions.

[0041] As a preferred embodiment, the electronic switch module further comprises a soft start resistor 34, which is connected in parallel to the power transmission line 1 to reduce the impact of starting current on the power grid, thereby protecting the power grid. The soft start resistor 34 is arranged in the fence and is arranged independently from the electronic lock 33.

[0042] In detail, the SVG unit further comprises a reactor 35 and a reactive compensation module 36, and the reactor 35 is arranged between the reactive compensation module 36 and the electronic switch module. Embodiment two

[0043] The utility model discloses still a kind of SVG fence protection system, the SVG fence protection system includes fence unit and the SVG fence protection circuit as described in embodiment one, and the electronic lock of the SVG fence protection circuit is installed in the fence unit.

[0044] Specifically, the fence unit comprises a fence body and a door structure, and the electronic lock is used to open or close the door structure. Embodiment three

[0045] The utility model discloses still a kind of photovoltaic power station, and the photovoltaic power station includes at least one SVG fence protection system as described in embodiment two.

[0046] In the description of the embodiments of the utility model, need explaining further, unless another explicit provision and limitation, if appear term " set ", " connection " should do broad sense understanding, for example, can be fixed connection, also can be detachable connection, or integrally connected, can be mechanical connection, also can be electrical connection, can be direct connection, also can indirectly connect through intermediate medium, can be two elements inside the intercommunication or two elements of the interaction relationship. For ordinary skilled person in the art, can understand the specific meaning of the above terms in the utility model according to specific circumstances.

[0047] In the description of the utility model, it is understood that the terms "first", "second" are only for the purpose of description, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features limited by "first", "second" can explicitly or implicitly include one or more features. In the description of the utility model, the meaning of "multiple" is two or more than two, unless otherwise explicitly specified.

[0048] In the utility model, unless another explicit provision and limitation, the terms "installation", "connection", "connection", "fixed" and other terms should be broad sense understanding, for example, can be fixed connection, also can be detachable connection, or integrated, can be mechanical connection, also can be electrical connection, can be direct connection, also can indirectly connect through intermediate medium, can be two elements inside the intercommunication or two elements of the interaction relationship. For ordinary skilled person in the art, can understand the specific meaning of the above terms in the utility model according to specific circumstances.

[0049] Obviously, the above embodiments are only examples for clearly illustrating, and not limited to the implementation mode. For ordinary skilled person in the art, on the basis of the above description, other different forms of changes or variations can be made. Here, it is not necessary and cannot be exhausted to all implementation modes. The obvious changes or variations derived from still be within the protection scope of the utility model creation.

Claims

1. An SVG fence protection circuit, characterized by: The SVG fence protection circuit comprises: a power transmission line, one end of which is connected to a busbar of a photovoltaic power station; an SVG unit connected to the other end of the power transmission line; a switch unit arranged on the power transmission line, the switch unit being used for controlling the on-off between the busbar and the SVG unit, the switch unit comprising a first switch, a second switch and an electronic switch module; wherein the electronic switch module comprises a control module and a mechanical part, the mechanical part comprising an electronic lock and an electronic lock control module, the electronic switch module being electrically connected to a control cabinet of the SVG unit to obtain a power supply, the control module collecting the on-off states of the first switch and the second switch and outputting a control signal to the electronic lock control module to control the on-off of the electronic lock.

2. An SVG fence protection circuit according to claim 1, characterized in that: The control module comprises a first terminal and a second terminal, the first terminal being used for detecting the on-off state of the first switch, and the second terminal being used for detecting the on-off state of the second switch.

3. The SVG fence protection circuit of claim 1, wherein: The SVG fence protection circuit further comprises a grounding switch module, the grounding switch module comprising a grounding switch and a lightning arrester, the grounding switch and the lightning arrester being connected in parallel to the power transmission line.

4. The SVG fence protection circuit of claim 1, wherein: The electronic switch module further comprises a soft start resistor, the soft start resistor being connected in parallel to the power transmission line.

5. The SVG fence protection circuit of claim 1, wherein: The electronic switch module further comprises an indicator light assembly, the indicator light assembly comprising a first indicator light and a second indicator light, the first indicator light being set to a first color, and the second indicator light being set to a second color.

6. The SVG fence protection circuit of claim 1, wherein: The first switch comprises a circuit breaker, and the second switch comprises an isolating switch.

7. The SVG fence protection circuit of claim 1, wherein: The SVG unit comprises a reactor and a reactive compensation module, the reactor being arranged between the reactive compensation module and the electronic switch module.

8. An SVG fence protection system characterized by: The SVG fence protection system comprises a fence unit and the SVG fence protection circuit according to any one of claims 1-7, the electronic lock of the SVG fence protection circuit being mounted on the fence unit.

9. An SVG fence protection system according to claim 8, characterized in that: The fence unit comprises a fence body and a door structure, and the electronic lock is used for opening or closing the door structure.

10. A photovoltaic power plant, characterized by: The SVG fence protection system comprises at least one SVG fence protection system according to claim 8 or 9.

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