CN109638795A - String type photovoltaic inverting system emergency stop control method and device - Google Patents

String type photovoltaic inverting system emergency stop control method and device Download PDF

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Publication number
CN109638795A
CN109638795A CN201910039669.4A CN201910039669A CN109638795A CN 109638795 A CN109638795 A CN 109638795A CN 201910039669 A CN201910039669 A CN 201910039669A CN 109638795 A CN109638795 A CN 109638795A
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China
Prior art keywords
switch
alternating
controller
string type
inverting system
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Granted
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CN201910039669.4A
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Chinese (zh)
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CN109638795B (en
Inventor
何宏伟
林镇煌
洪培在
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Xiamen Kehua shuneng Technology Co.,Ltd.
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Xiamen Kehua Hengsheng Co Ltd
Zhangzhou Kehua Technology Co Ltd
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Classifications

    • HELECTRICITY
    • H02GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02HEMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
    • H02H7/00Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions
    • H02H7/26Sectionalised protection of cable or line systems, e.g. for disconnecting a section on which a short-circuit, earth fault, or arc discharge has occured
    • HELECTRICITY
    • H02GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02JCIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J3/00Circuit arrangements for ac mains or ac distribution networks
    • H02J3/38Arrangements for parallely feeding a single network by two or more generators, converters or transformers
    • H02J3/381Dispersed generators
    • H02J3/382Dispersed generators the generators exploiting renewable energy
    • H02J3/383Solar energy, e.g. photovoltaic energy
    • YGENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02EREDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E10/00Energy generation through renewable energy sources
    • Y02E10/50Photovoltaic [PV] energy
    • Y02E10/56Power conversion systems, e.g. maximum power point trackers

Abstract

The present invention provides a kind of string type photovoltaic inverting system emergency stop control method and device, string type photovoltaic inverting system includes dc switch, switch detection unit, inversion unit, alternating-current switch and controller;The input terminal of dc switch is for accessing DC power supply, one end connection of output end and dc switch;The other end of dc switch and the input terminal of inversion unit connect, and the output end of inversion unit accesses AC network by alternating-current switch;Controller is connect with switch detection unit, inversion unit and alternating-current switch respectively;Method is applied to controller: when string type photovoltaic inverting system needs emergency shutdown, receiving the status signal for the dc switch that switch detection unit is sent;Detect the status signal of dc switch;If detecting, the status signal of dc switch is switched to off-state from access state, exports cut-off signal to alternating-current switch, stops to achieve the effect that fast break is protected for electric energy to AC network so that alternating-current switch is disconnected.

Description

String type photovoltaic inverting system emergency stop control method and device
Technical field
The invention belongs to technical field of photovoltaic power generation more particularly to a kind of string type photovoltaic inverting system emergency stop control methods And device.
Background technique
Photovoltaic power generation is that solar energy is converted directly into electric energy, have safe and reliable, low noise, it is pollution-free, without consumption The advantages such as fuel, construction period be short.Grid-connected photovoltaic power generation is that the quality electric energy for generating solar components passes through string type photovoltaic Inversion system is directly accessed public electric wire net after being converted into industrial frequency AC electric energy.
There is the high pressure fatal to human body in string type photovoltaic inverting system, therefore in photovoltaic inverting system during the work time Be abnormal or in emergency circumstances, photovoltaic inverting system have sudden-stop function to avoid or reduce the wound that may cause to operator Evil.
The existing sudden-stop function applied to string type photovoltaic inverting system, mainly by closing DC side dc switch DC side input voltage is caused to reduce, when DC side input voltage is lower than certain value, DSP (Digital Signal Processing, Digital Signal Processing) controller judges that photovoltaic inverting system can not continue to work normally, photovoltaic inverting system into After row enters standby mode for a period of time, just controls photovoltaic inverting system and exchange side off-grid, achieve the effect that emergency stop.But it is such Since sudden-stop function terminate closing DC side dc switch to dsp controller control photovoltaic inverting system exchange side off-grid, Centre needs the longer movement corresponding time, causes the emergency stop response time slack-off, cannot achieve the purpose that fast break is protected.
Summary of the invention
In view of this, the embodiment of the invention provides string type photovoltaic inverting system emergency stop control method and device, with solution When certainly emergency stop controls in the prior art, since closing DC side dc switch, handed over to dsp controller control photovoltaic inverting system Stream side off-grid terminates, and centre needs the longer movement corresponding time, causes the emergency stop response time slack-off, cannot reach fast break The problem of purpose of protection.
The first aspect of the embodiment of the present invention provides a kind of string type photovoltaic inverting system emergency stop control method, and described group String data photovoltaic inverting system includes dc switch, switch detection unit, inversion unit, alternating-current switch and controller;The direct current For accessing DC power supply, output end is connect the input terminal of switch with the input terminal of the inversion unit;The switch detection is single Member is for detecting the switch state of the dc switch;The output end of the inversion unit passes through alternating-current switch access exchange Power grid;The controller is connect with the switch detection unit, the inversion unit and the alternating-current switch respectively;The method Applied to the controller, comprising:
When the string type photovoltaic inverting system needs emergency shutdown, the described of the switch detection unit transmission is received The status signal of dc switch;
Detect the status signal of the dc switch;
If detecting, the status signal of the dc switch is switched to off-state by access state, opens to the exchange Output cut-off signal is closed, stops powering to AC network so that the alternating-current switch is disconnected.
The second aspect of the embodiment of the present invention provides a kind of string type photovoltaic inverting system emergency stop control device, and described group String data photovoltaic inverting system includes dc switch, switch detection unit, inversion unit, alternating-current switch and controller;The direct current For accessing DC power supply, output end is connect the input terminal of switch with the input terminal of the inversion unit;The switch detection is single Member is for detecting the switch state of the dc switch;The output end of the inversion unit passes through alternating-current switch access exchange Power grid;The controller is connect with the switch detection unit, the inversion unit and the alternating-current switch respectively;Described device Applied to the controller, comprising:
Status signal receiving unit, for when the string type photovoltaic inverting system needs emergency shutdown, described in reception Switch the status signal for the dc switch that detection unit is sent;
Status signal detection unit, for detecting the status signal of the dc switch;
Emergency stop control unit, if for detecting that the status signal of the dc switch is switched to disconnection shape from access state State then exports cut-off signal to the alternating-current switch, stops powering to AC network so that the alternating-current switch is disconnected.
The third aspect of the embodiment of the present invention provides a kind of string type photovoltaic inverting system, comprising: the string type light Volt inversion system includes dc switch, switch detection unit, inversion unit, alternating-current switch and controller;The dc switch For accessing DC power supply, output end is connect input terminal with the input terminal of the inversion unit;The switch detection unit is used for Detect the switch state of the dc switch;The output end of the inversion unit accesses AC network by the alternating-current switch; The controller is connect with the switch detection unit, the inversion unit and the alternating-current switch respectively;
When the string type photovoltaic inverting system needs emergency shutdown, the controller receives the switch detection unit The status signal of the dc switch sent;
The controller detects the variable condition of the status signal of the dc switch;
If the controller detects that the status signal of the dc switch is switched to off-state from access state, to The alternating-current switch exports cut-off signal, stops powering to AC network so that the alternating-current switch is disconnected.
The fourth aspect of the embodiment of the present invention provides a kind of computer readable storage medium, the computer-readable storage Media storage has computer program, and the step of method as described in relation to the first aspect is realized when the computer program is executed by processor Suddenly.
Existing beneficial effect is the embodiment of the present invention compared with prior art: string type light provided in an embodiment of the present invention Lie prostrate inversion system emergency stop control method and device, the string type photovoltaic inverting system include dc switch, switch detection unit, Inversion unit, alternating-current switch and controller;The input terminal of the dc switch is for accessing DC power supply, output end and described straight One end connection of stream switch;The other end of the dc switch is connect with the input terminal of the inversion unit;The switch detection Unit is used to detect the switch state of the dc switch;The output end of the inversion unit is handed over by alternating-current switch access Galvanic electricity net;The controller is connect with the switch detection unit, the inversion unit and the alternating-current switch respectively;The side Method is applied to the controller, and when the string type photovoltaic inverting system needs emergency shutdown, it is single to receive the switch detection The status signal for the dc switch that member is sent;Detect the status signal of the dc switch;If detecting, the direct current is opened The status signal of pass is switched to off-state from access state, then cut-off signal is exported to the alternating-current switch, so that the friendship Stream switch is disconnected to be stopped powering to AC network.By detecting the state of DC side dc switch, when dc switch is by access state It is switched to off-state, control exchange side off-grid, the moment that can be disconnected in dc switch cuts off the power grid power supply of exchange side, The response time for greatly shortening emergency stop achievees the effect that fast break is protected.
Detailed description of the invention
It to describe the technical solutions in the embodiments of the present invention more clearly, below will be to embodiment or description of the prior art Needed in attached drawing be briefly described, it should be apparent that, the accompanying drawings in the following description is only of the invention some Embodiment for those of ordinary skill in the art without any creative labor, can also be according to these Attached drawing obtains other attached drawings.
Fig. 1 is the structural schematic diagram for the string type photovoltaic inverting system that one embodiment of the invention provides;
Fig. 2 is the flow diagram for the string type photovoltaic inverting system emergency stop control method that one embodiment of the invention provides;
Fig. 3 is the structural block diagram for the string type photovoltaic inverting system emergency stop control that one embodiment of the invention provides;
Fig. 4 is the structural schematic diagram for the controller that one embodiment of the invention provides.
Specific embodiment
In being described below, for illustration and not for limitation, the tool of such as particular system structure, technology etc is proposed Body details, to understand thoroughly the embodiment of the present invention.However, it will be clear to one skilled in the art that there is no these specific The present invention also may be implemented in the other embodiments of details.In other situations, it omits to well-known system, device, electricity The detailed description of road and method, in case unnecessary details interferes description of the invention.
In order to illustrate technical solutions according to the invention, the following is a description of specific embodiments.
With reference to Fig. 1, Fig. 1 is the structural schematic diagram for the string type photovoltaic inverting system that one embodiment of the invention provides.Group string Formula photovoltaic inverting system includes dc switch 10, switch detection unit 50, inversion unit 20, alternating-current switch 30 and controller 40; For accessing DC power supply, output end is connect the input terminal of dc switch 10 with the input terminal of inversion unit 20;Switch detection is single Member 50 is for detecting the switch state of the dc switch 10;The output end of inversion unit 20 passes through the access exchange of alternating-current switch 30 Power grid;Controller 40 is connect with switch detection unit 50, inversion unit 20 and alternating-current switch 30 respectively.Wherein, dc switch 10 Input terminal access DC power supply be photovoltaic power generation plate direct current.Inversion unit 20 can be one or more inverters simultaneously Connection composition.Alternating-current switch 30 can be output relay.Controller 40 be dsp controller, controller 40 respectively with dc switch 10, inversion unit 20 and alternating-current switch 30 connect, and wherein controller 40 controls inversion unit 20 for direct current by output pwm signal The direct current that power supply provides is converted to alternating current, supplies AC network.
In the present embodiment, switch detection unit 50 can be mechanical system with the linkage of dc switch 10.Specifically, The switch detection unit 50 can be the dc switch with the same specification of 10 mechanical linkage of dc switch.
Optionally, switch detection unit 50 can be electrically connected with dc switch 10.Specifically, the dc switch of the present embodiment Can be on 10 setting one monopole end, and the controller 40 in string type photovoltaic inverting system by switch detection unit 50 with The monopole end of dc switch connects.When the switching value variation of dc switch 10, monopole end accordingly changes, and switchs detection unit 50 also accordingly change, and then detect the switch state of dc switch 10.
With reference to Fig. 2, Fig. 2 is the process for the string type photovoltaic inverting system emergency stop control method that one embodiment of the invention provides Schematic diagram, this method are applied to the controller 40. of string type photovoltaic inverting system shown in FIG. 1, include the following steps:
S201: when string type photovoltaic inverting system needs emergency shutdown, the institute that the switch detection unit is sent is received State the status signal of dc switch.
In the present embodiment, the case where string type photovoltaic inverting system needs emergency shutdown refers to string type photovoltaic inversion System jam needs to ensure equipment operation and personnel safety by string type photovoltaic inverting system plant-wide emergency shutdown.
S202: the status signal of dc switch is detected.
In the present embodiment, the status signal of dc switch include be in an off state, in access state, in by connecing Enter state and is switched to off-state or in being switched to four kinds of states of access state by off-state.
S203: if detecting, the status signal of dc switch is switched to off-state by access state, to alternating-current switch Cut-off signal is exported, stops powering to AC network so that alternating-current switch is disconnected.
In the present embodiment, it detects that the status signal of dc switch is switched to off-state by access state, shows to need Cut-off signal then is exported to alternating-current switch to string type photovoltaic inverting system plant-wide emergency shutdown, alternating-current switch disconnects cutting inversion The power supply of unit and AC network.
As can be seen from the above description, by the state of detection DC side dc switch, when dc switch is switched by access state For off-state, control exchange side off-grid, the moment that can be disconnected in dc switch cuts off the power grid power supply of exchange side, significantly The response time for shortening emergency stop achievees the effect that fast break is protected.
In one embodiment of the invention, the step S203 further include: disconnect letter exporting to the alternating-current switch Number while, stop to the inversion unit output pwm signal, so that the inversion unit stops working.
In the present embodiment, stop stopped the work of inversion unit to the inversion unit output pwm signal, It stopped the direct current that DC power supply is provided and be converted to alternating current.
As can be seen from the above description, being realized inverse to string type photovoltaic by being simultaneously stopped inversion unit and cutting alternating-current switch Change system is integrally shut down, and achievees the effect that shut down comprehensively.
It should be understood that the size of the serial number of each step is not meant that the order of the execution order in above-described embodiment, each process Execution sequence should be determined by its function and internal logic, the implementation process without coping with the embodiment of the present invention constitutes any limit It is fixed.
Corresponding to the string type photovoltaic inverting system emergency stop control method of foregoing embodiments, Fig. 3 is one embodiment of the application The structural block diagram of the string type photovoltaic inverting system emergency stop control of offer.For ease of description, it illustrates only and implements with the application The relevant part of example.The string type photovoltaic inverting system includes that dc switch, switch detection unit, inversion unit, exchange are opened Pass and controller;The input terminal of the dc switch is for accessing DC power supply, the input terminal of output end and the inversion unit Connection;The switch detection unit is used to detect the switch state of the dc switch;The output end of the inversion unit passes through The alternating-current switch accesses AC network;The controller respectively with the switch detection unit, the inversion unit and described Alternating-current switch connection;With reference to Fig. 3, described device is applied to the controller, comprising:
Status signal receiving unit 301, for receiving institute when the string type photovoltaic inverting system needs emergency shutdown State the status signal for the dc switch that switch detection unit is sent;
Status signal detection unit 302, for detecting the status signal of the dc switch;
Emergency stop control unit 303, if being switched to for detecting the status signal of the dc switch from access state disconnected Open state then exports cut-off signal to the alternating-current switch, stops powering to AC network so that the alternating-current switch is disconnected.
In one embodiment of the invention, the emergency stop control unit 303 is also used to export to the alternating-current switch While cut-off signal, stop to the inversion unit output pwm signal, so that the inversion unit stops working.
Fig. 4 is the structural schematic diagram for the controller that one embodiment of the invention provides.As shown in figure 4, the control of the embodiment Device 40 includes: processor 60, memory 61 and is stored in the memory 61 and can run on the processor 60 Computer program 62, such as string type photovoltaic inverting system emergency stop control program.The processor 60 executes the computer journey The step in above-mentioned each string type photovoltaic inverting system emergency stop control method embodiment is realized when sequence 62, such as shown in Fig. 2 Step 201 is to 203.
Illustratively, the computer program 62 can be divided into one or more module/units, it is one or Multiple module/units are stored in the memory 61, and are executed by the processor 60, to complete the present invention.Described one A or multiple module/units can be the series of computation machine program instruction section that can complete specific function, which is used for Implementation procedure of the computer program 62 in the controller 40 is described.For example, the computer program 62 can be divided It is cut into status signal receiving unit 301, status signal detection unit 302 and emergency stop control unit 303.
The controller 40 can be desktop PC, notebook, palm PC and cloud server etc. and calculate equipment. The controller may include, but be not limited only to, processor 60, memory 61.It will be understood by those skilled in the art that Fig. 4 is only It is the example of controller 40, does not constitute the restriction to controller 40, may include components more more or fewer than diagram, or Certain components or different components are combined, such as the controller can also be set including input-output equipment, network insertion Standby, bus etc..
Alleged processor 60 can be central processing unit (Central Processing Unit, CPU), can also be Other general processors, digital signal processor (Digital Signal Processor, DSP), specific integrated circuit (Application Specific Integrated Circuit, ASIC), ready-made programmable gate array (Field- Programmable Gate Array, FPGA) either other programmable logic device, discrete gate or transistor logic, Discrete hardware components etc..General processor can be microprocessor or the processor is also possible to any conventional processor Deng.
The memory 61 can be the internal storage unit of the controller 40, such as the hard disk or interior of controller 40 It deposits.The memory 61 is also possible to the External memory equipment of the controller 40, such as is equipped on the controller 40 slotting Connect formula hard disk, intelligent memory card (Smart Media Card, SMC), secure digital (Secure Digital, SD) card, flash memory Block (Flash Card) etc..Further, the memory 61 can also both include the internal storage unit of the controller 40 It also include External memory equipment.The memory 61 is for storing needed for the computer program and the controller other Program and data.The memory 61 can be also used for temporarily storing the data that has exported or will export.
It is apparent to those skilled in the art that for convenience of description and succinctly, only with above-mentioned each function Can unit, module division progress for example, in practical application, can according to need and by above-mentioned function distribution by different Functional unit, module are completed, i.e., the internal structure of described device is divided into different functional unit or module, more than completing The all or part of function of description.Each functional unit in embodiment, module can integrate in one processing unit, can also To be that each unit physically exists alone, can also be integrated in one unit with two or more units, it is above-mentioned integrated Unit both can take the form of hardware realization, can also realize in the form of software functional units.In addition, each function list Member, the specific name of module are also only for convenience of distinguishing each other, the protection scope being not intended to limit this application.Above system The specific work process of middle unit, module, can refer to corresponding processes in the foregoing method embodiment, and details are not described herein.
In the above-described embodiments, it all emphasizes particularly on different fields to the description of each embodiment, is not described in detail or remembers in some embodiment The part of load may refer to the associated description of other embodiments.
Those of ordinary skill in the art may be aware that list described in conjunction with the examples disclosed in the embodiments of the present disclosure Member and algorithm steps can be realized with the combination of electronic hardware or computer software and electronic hardware.These functions are actually It is implemented in hardware or software, the specific application and design constraint depending on technical solution.Professional technician Each specific application can be used different methods to achieve the described function, but this realization is it is not considered that exceed The scope of the present invention.
In embodiment provided by the present invention, it should be understood that disclosed device/terminal device and method, it can be with It realizes by another way.For example, device described above/terminal device embodiment is only schematical, for example, institute The division of module or unit is stated, only a kind of logical function partition, there may be another division manner in actual implementation, such as Multiple units or components can be combined or can be integrated into another system, or some features can be ignored or not executed.Separately A bit, shown or discussed mutual coupling or direct-coupling or communication connection can be through some interfaces, device Or the INDIRECT COUPLING or communication connection of unit, it can be electrical property, mechanical or other forms.
The unit as illustrated by the separation member may or may not be physically separated, aobvious as unit The component shown may or may not be physical unit, it can and it is in one place, or may be distributed over multiple In network unit.It can select some or all of unit therein according to the actual needs to realize the mesh of this embodiment scheme 's.
It, can also be in addition, the functional units in various embodiments of the present invention may be integrated into one processing unit It is that each unit physically exists alone, can also be integrated in one unit with two or more units.Above-mentioned integrated list Member both can take the form of hardware realization, can also realize in the form of software functional units.
If the integrated module/unit be realized in the form of SFU software functional unit and as independent product sale or In use, can store in a computer readable storage medium.Based on this understanding, the present invention realizes above-mentioned implementation All or part of the process in example method, can also instruct relevant hardware to complete, the meter by computer program Calculation machine program can be stored in a computer readable storage medium, the computer program when being executed by processor, it can be achieved that on The step of stating each embodiment of the method.Wherein, the computer program includes computer program code, the computer program Code can be source code form, object identification code form, executable file or certain intermediate forms etc..Computer-readable Jie Matter may include: can carry the computer program code any entity or device, recording medium, USB flash disk, mobile hard disk, Magnetic disk, CD, computer storage, read-only memory (ROM, Read-Only Memory), random access memory (RAM, Random Access Memory), electric carrier signal, telecommunication signal and software distribution medium etc..It should be noted that described The content that computer-readable medium includes can carry out increasing appropriate according to the requirement made laws in jurisdiction with patent practice Subtract, such as does not include electric carrier signal and electricity according to legislation and patent practice, computer-readable medium in certain jurisdictions Believe signal.
Embodiment described above is merely illustrative of the technical solution of the present invention, rather than its limitations;Although referring to aforementioned reality Applying example, invention is explained in detail, those skilled in the art should understand that: it still can be to aforementioned each Technical solution documented by embodiment is modified or equivalent replacement of some of the technical features;And these are modified Or replacement, the spirit and scope for technical solution of various embodiments of the present invention that it does not separate the essence of the corresponding technical solution should all It is included within protection scope of the present invention.

Claims (10)

1. a kind of string type photovoltaic inverting system emergency stop control method, which is characterized in that the string type photovoltaic inverting system packet Include dc switch, switch detection unit, inversion unit, alternating-current switch and controller;The input terminal of the dc switch is for connecing Enter DC power supply, output end is connect with the input terminal of the inversion unit;The switch detection unit is for detecting the direct current The switch state of switch;The output end of the inversion unit accesses AC network by the alternating-current switch;The controller point It is not connect with the switch detection unit, the inversion unit and the alternating-current switch;The method is applied to the controller, Include:
When the string type photovoltaic inverting system needs emergency shutdown, the direct current that the switch detection unit is sent is received The status signal of switch;
Detect the status signal of the dc switch;
If detecting, the status signal of the dc switch is switched to off-state by access state, defeated to the alternating-current switch Cut-off signal out stops powering to AC network so that the alternating-current switch is disconnected.
2. string type photovoltaic inverting system emergency stop control method as described in claim 1, which is characterized in that the exchange While switch output cut-off signal, the method also includes:
Stop exporting pwm pulse bandwidth modulation signals to the inversion unit, so that the inversion unit stops working.
3. string type photovoltaic inverting system emergency stop control method as described in claim 1, which is characterized in that the controller is Digital Signal Processing dsp controller.
4. a kind of string type photovoltaic inverting system emergency stop control device, which is characterized in that the string type photovoltaic inverting system packet Include dc switch, switch detection unit, inversion unit, alternating-current switch and controller;The input terminal of the dc switch is for connecing Enter DC power supply, output end is connect with the input terminal of the inversion unit;The switch detection unit is for detecting the direct current The switch state of switch;The output end of the inversion unit accesses AC network by the alternating-current switch;The controller point It is not connect with the switch detection unit, the inversion unit and the alternating-current switch;Described device is applied to the controller, Include:
Status signal receiving unit, for receiving the switch when the string type photovoltaic inverting system needs emergency shutdown The status signal for the dc switch that detection unit is sent;
Status signal detection unit, for detecting the status signal of the dc switch;
Emergency stop control unit, if for detecting that the status signal of the dc switch is switched to off-state from access state, Cut-off signal then is exported to the alternating-current switch, stops powering to AC network so that the alternating-current switch is disconnected.
5. string type photovoltaic inverting system emergency stop control device as claimed in claim 4, which is characterized in that the emergency stop control Unit is also used to stop while exporting cut-off signal to the alternating-current switch to the inversion unit output pwm signal, So that the inversion unit stops working.
6. string type photovoltaic inverting system emergency stop control device as claimed in claim 4, which is characterized in that the controller is Digital Signal Processing dsp controller.
7. a kind of string type photovoltaic inverting system characterized by comprising the string type photovoltaic inverting system includes that direct current is opened It closes, switch detection unit, inversion unit, alternating-current switch and controller;The input terminal of the dc switch is for accessing direct current Source, output end are connect with the input terminal of the inversion unit;The switch detection unit is for detecting opening for the dc switch Off status;The output end of the inversion unit accesses AC network by the alternating-current switch;The controller respectively with it is described Switch detection unit, the inversion unit are connected with the alternating-current switch;
When the string type photovoltaic inverting system needs emergency shutdown, the controller receives the switch detection unit and sends The dc switch status signal;
The controller detects the variable condition of the status signal of the dc switch;
If the controller detects that the status signal of the dc switch is switched to off-state, Xiang Suoshu from access state Alternating-current switch exports cut-off signal, stops powering to AC network so that the alternating-current switch is disconnected.
8. string data photovoltaic inverting system as claimed in claim 7, which is characterized in that disconnect letter exporting to the alternating-current switch Number while, the controller stops to the inversion unit output pwm signal, so that the inversion unit stops working.
9. string data photovoltaic inverting system as claimed in claim 7, which is characterized in that the controller is Digital Signal Processing Dsp controller.
10. a kind of computer readable storage medium, the computer-readable recording medium storage has computer program, and feature exists In when the computer program is executed by processor the step of any one of such as claims 1 to 3 of realization the method.
CN201910039669.4A 2019-01-16 2019-01-16 Emergency stop control method and device for string type photovoltaic inverter system Active CN109638795B (en)

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Publication number Priority date Publication date Assignee Title
EP3979450A1 (en) * 2020-10-05 2022-04-06 Fronius International GmbH Photovoltaic system

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