CN109638795B - Emergency stop control method and device for string type photovoltaic inverter system - Google Patents
Emergency stop control method and device for string type photovoltaic inverter system Download PDFInfo
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H7/00—Emergency 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
- H02H7/26—Sectionalised protection of cable or line systems, e.g. for disconnecting a section on which a short-circuit, earth fault, or arc discharge has occured
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- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
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Abstract
The invention provides an emergency stop control method and device for a string type photovoltaic inversion system, wherein the string type photovoltaic inversion system comprises a direct current switch, a switch detection unit, an inversion unit, an alternating current switch and a controller; the input end of the direct current switch is used for connecting a direct current power supply, and the output end of the direct current switch is connected with one end of the direct current switch; the other end of the direct current switch is connected with the input end of the inversion unit, and the output end of the inversion unit is connected to an alternating current power grid through the alternating current switch; the controller is respectively connected with the switch detection unit, the inversion unit and the alternating current switch; the method is applied to a controller: when the group-series photovoltaic inverter system needs emergency shutdown, receiving a state signal of the direct-current switch sent by the switch detection unit; detecting a state signal of the direct current switch; if the state signal of the direct current switch is detected to be switched from the connection state to the disconnection state, the disconnection signal is output to the alternating current switch, so that the alternating current switch is switched off to stop supplying electric energy to the alternating current power grid, and the effect of rapid power-off protection can be achieved.
Description
Technical Field
The invention belongs to the technical field of photovoltaic power generation, and particularly relates to an emergency stop control method and device for a string type photovoltaic inverter system.
Background
The photovoltaic power generation is to directly convert solar energy into electric energy, and has the advantages of safety, reliability, low noise, no pollution, no fuel consumption, short construction period and the like. The grid-connected photovoltaic power generation is characterized in that quality electric energy generated by a solar module is converted into power frequency alternating current electric energy through a string type photovoltaic inverter system and then is directly connected to a public power grid.
The string type photovoltaic inverter system has high voltage fatal to a human body in the working process, so that the photovoltaic inverter system has an emergency stop function to avoid or reduce possible injury to an operator under the condition that the photovoltaic inverter system is abnormal or in an emergency.
The existing emergency stop function applied to a string-type photovoltaic inverter system is mainly characterized in that a direct-current side direct-current switch is turned off to reduce direct-current side input voltage, when the direct-current side input voltage is lower than a certain value, a DSP (Digital signal processing) controller judges that the photovoltaic inverter system cannot continue to work normally, and after the photovoltaic inverter system enters a standby state for a period of time, the photovoltaic inverter system controls the AC side of the photovoltaic inverter system to be disconnected, so that the emergency stop effect is achieved. However, in the emergency stop function, from the time when the direct-current side direct-current switch is turned off to the time when the DSP controller controls the photovoltaic inverter system to disconnect from the grid, a long action corresponding time is required in the middle, so that the emergency stop response time is slowed down, and the purpose of fast power-off protection cannot be achieved.
Disclosure of Invention
In view of this, embodiments of the present invention provide a method and an apparatus for controlling emergency stop of a string-type photovoltaic inverter system, so as to solve the problem that, during emergency stop control in the prior art, a long corresponding time is required from when a dc switch on a dc side is turned off to when a DSP controller controls disconnection of an ac side of the photovoltaic inverter system, which results in a slow response time of emergency stop and fails to achieve a purpose of fast power-off protection.
The first aspect of the embodiment of the invention provides an emergency stop control method for a string-type photovoltaic inverter system, wherein the string-type photovoltaic inverter system comprises a direct current switch, a switch detection unit, an inverter unit, an alternating current switch and a controller; the input end of the direct current switch is used for being connected with a direct current power supply, and the output end of the direct current switch is connected with the input end of the inversion unit; the switch detection unit is used for detecting the switch state of the direct current switch; the output end of the inversion unit is connected to an alternating current power grid through the alternating current switch; the controller is respectively connected with the switch detection unit, the inversion unit and the alternating current switch; the method is applied to the controller and comprises the following steps:
when the group of series photovoltaic inverter systems need emergency shutdown, receiving the state signals of the direct current switches sent by the switch detection unit;
detecting a state signal of the direct current switch;
and if the state signal of the direct current switch is detected to be switched from the connection state to the disconnection state, outputting a disconnection signal to the alternating current switch so as to enable the alternating current switch to be switched off and stop supplying power to the alternating current power grid.
A second aspect of the embodiments of the present invention provides an emergency stop control device for a string-type photovoltaic inverter system, where the string-type photovoltaic inverter system includes a dc switch, a switch detection unit, an inverter unit, an ac switch, and a controller; the input end of the direct current switch is used for being connected with a direct current power supply, and the output end of the direct current switch is connected with the input end of the inversion unit; the switch detection unit is used for detecting the switch state of the direct current switch; the output end of the inversion unit is connected to an alternating current power grid through the alternating current switch; the controller is respectively connected with the switch detection unit, the inversion unit and the alternating current switch; the device is applied to the controller and comprises:
the state signal receiving unit is used for receiving the state signal of the direct-current switch sent by the switch detection unit when the group of series photovoltaic inverter systems needs emergency shutdown;
the state signal detection unit is used for detecting a state signal of the direct current switch;
and the emergency stop control unit is used for outputting a disconnection signal to the alternating current switch to enable the alternating current switch to be switched off and stop supplying power to the alternating current power grid if the condition signal of the direct current switch is detected to be switched from the connection condition to the disconnection condition.
A third aspect of an embodiment of the present invention provides a string-type photovoltaic inverter system, including: the group-string photovoltaic inverter system comprises a direct current switch, a switch detection unit, an inverter unit, an alternating current switch and a controller; the input end of the direct current switch is used for being connected with a direct current power supply, and the output end of the direct current switch is connected with the input end of the inversion unit; the switch detection unit is used for detecting the switch state of the direct current switch; the output end of the inversion unit is connected to an alternating current power grid through the alternating current switch; the controller is respectively connected with the switch detection unit, the inversion unit and the alternating current switch;
when the group of series photovoltaic inverter systems need emergency shutdown, the controller receives the state signals of the direct current switches sent by the switch detection unit;
the controller detects the change state of the state signal of the direct current switch;
and if the controller detects that the state signal of the direct current switch is switched from the connection state to the disconnection state, the controller outputs a disconnection signal to the alternating current switch so as to enable the alternating current switch to be switched off and stop supplying power to the alternating current power grid.
A fourth aspect of embodiments of the present invention provides a computer-readable storage medium storing a computer program which, when executed by a processor, performs the steps of the method according to the first aspect.
Compared with the prior art, the embodiment of the invention has the following beneficial effects: the invention provides a method and a device for controlling emergency stop of a string type photovoltaic inversion system, wherein the string type photovoltaic inversion system comprises a direct current switch, a switch detection unit, an inversion unit, an alternating current switch and a controller; the input end of the direct current switch is used for connecting a direct current power supply, and the output end of the direct current switch is connected with one end of the direct current switch; the other end of the direct current switch is connected with the input end of the inversion unit; the switch detection unit is used for detecting the switch state of the direct current switch; the output end of the inversion unit is connected to an alternating current power grid through the alternating current switch; the controller is respectively connected with the switch detection unit, the inversion unit and the alternating current switch; the method is applied to the controller, and when the group of series photovoltaic inverter systems need emergency shutdown, the state signals of the direct current switches sent by the switch detection unit are received; detecting a state signal of the direct current switch; and if the state signal of the direct current switch is detected to be switched from the connection state to the disconnection state, outputting a disconnection signal to the alternating current switch so as to enable the alternating current switch to be switched off and stop supplying power to the alternating current power grid. By detecting the state of the direct-current side direct-current switch, when the direct-current switch is switched from the on state to the off state, the alternating-current side is controlled to be off-line, the power supply of a power grid on the alternating-current side can be cut off at the moment when the direct-current switch is cut off, the response time of emergency stop is greatly shortened, and the effect of rapid power-off protection is achieved.
Drawings
In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings needed to be used in the embodiments or the prior art descriptions will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings based on these drawings without inventive exercise.
Fig. 1 is a schematic structural diagram of a string-type photovoltaic inverter system according to an embodiment of the present invention;
fig. 2 is a schematic flow chart of an emergency stop control method for a string-type photovoltaic inverter system according to an embodiment of the present invention;
fig. 3 is a block diagram illustrating an emergency stop control of the string-type photovoltaic inverter system according to an embodiment of the present invention;
fig. 4 is a schematic structural diagram of a controller according to an embodiment of the present invention.
Detailed Description
In the following description, for purposes of explanation and not limitation, specific details are set forth, such as particular system structures, techniques, etc. in order to provide a thorough understanding of the embodiments of the invention. It will be apparent, however, to one skilled in the art that the present invention may be practiced in other embodiments that depart from these specific details. In other instances, detailed descriptions of well-known systems, devices, circuits, and methods are omitted so as not to obscure the description of the present invention with unnecessary detail.
In order to explain the technical means of the present invention, the following description will be given by way of specific examples.
Referring to fig. 1, fig. 1 is a schematic structural diagram of a string-type photovoltaic inverter system according to an embodiment of the present invention. The group-string photovoltaic inverter system comprises a direct current switch 10, a switch detection unit 50, an inverter unit 20, an alternating current switch 30 and a controller 40; the input end of the dc switch 10 is used for accessing a dc power supply, and the output end is connected with the input end of the inverter unit 20; the switch detection unit 50 is used for detecting the switch state of the direct current switch 10; the output end of the inversion unit 20 is connected to an alternating current power grid through an alternating current switch 30; the controller 40 is connected to the switch detection unit 50, the inverter unit 20, and the ac switch 30, respectively. The direct current power supply connected to the input end of the direct current switch 10 is direct current of the photovoltaic power generation panel. The inverter unit 20 may be formed by one or more inverters connected in parallel. The ac switch 30 may be an output relay. The controller 40 is a DSP controller, and the controller 40 is connected to the dc switch 10, the inverter unit 20, and the ac switch 30, respectively, wherein the controller 40 controls the inverter unit 20 to convert the dc power provided by the dc power supply into ac power through outputting a PWM signal, and supplies the ac power to the ac power grid.
In the present embodiment, the switch detection unit 50 may be mechanically linked to the dc switch 10. Specifically, the switch detection unit 50 may be a dc switch of the same specification mechanically linked to the dc switch 10.
Alternatively, the switch detection unit 50 may be electrically connected to the dc switch 10. Specifically, a single pole terminal may be disposed on the dc switch 10 of the present embodiment, and the controller 40 in the string-type photovoltaic inverter system is connected to the single pole terminal of the dc switch through the switch detection unit 50. When the switching value of the dc switch 10 changes, the single pole end changes accordingly, and the switch detection unit 50 also changes accordingly, thereby detecting the switching state of the dc switch 10.
Referring to fig. 2, fig. 2 is a schematic flow chart of an emergency stop control method for a string-type photovoltaic inverter system according to an embodiment of the present invention, where the method is applied to a controller 40 of the string-type photovoltaic inverter system shown in fig. 1, and includes the following steps:
s201: and when the group-series photovoltaic inverter system needs emergency shutdown, receiving the state signal of the direct-current switch sent by the switch detection unit.
In this embodiment, the condition that the string-type photovoltaic inverter system needs to be shut down emergently means that the string-type photovoltaic inverter system fails, and the string-type photovoltaic inverter system needs to be shut down emergently to ensure equipment operation and personnel safety.
S202: and detecting a state signal of the direct current switch.
In this embodiment, the state signal of the dc switch includes four states, i.e., in an off state, in an on state, in a state switched from the on state to the off state, or in a state switched from the off state to the on state.
S203: and if the state signal of the direct current switch is detected to be switched from the connection state to the disconnection state, outputting a disconnection signal to the alternating current switch so as to enable the alternating current switch to be switched off and stop supplying power to the alternating current power grid.
In this embodiment, when it is detected that the state signal of the dc switch is switched from the on state to the off state, which indicates that the group string type photovoltaic inverter system needs to be shut down urgently, the off signal is output to the ac switch, and the ac switch disconnects the power supply between the inverter unit and the ac power grid.
From the above description, it can be known that, by detecting the state of the dc switch on the dc side, when the dc switch is switched from the on state to the off state, the ac side is controlled to be disconnected, and the power supply of the power grid on the ac side can be cut off at the moment when the dc switch is turned off, so that the response time of emergency stop is greatly shortened, and the effect of fast power-off protection is achieved.
In an embodiment of the present invention, the step S203 further includes: and stopping outputting the PWM signal to the inversion unit while outputting a disconnection signal to the alternating current switch so as to stop the operation of the inversion unit.
In this embodiment, the output of the PWM signal to the inverter unit is stopped, that is, the inverter unit is stopped from operating, that is, the dc power provided by the dc power supply is stopped from being converted into ac power.
According to the above description, the inverter unit is stopped and the alternating current switch is cut off simultaneously, so that the integral shutdown of the string-type photovoltaic inverter system is realized, and the effect of comprehensive shutdown is achieved.
It should be understood that, the sequence numbers of the steps in the foregoing embodiments do not imply an execution sequence, and the execution sequence of each process should be determined by its function and inherent logic, and should not constitute any limitation to the implementation process of the embodiments of the present invention.
Fig. 3 is a block diagram of a structure of the emergency stop control of the string-type photovoltaic inverter system according to an embodiment of the present application, which corresponds to the emergency stop control method of the string-type photovoltaic inverter system according to the foregoing embodiment. For convenience of explanation, only portions related to the embodiments of the present application are shown. The group-string photovoltaic inverter system comprises a direct current switch, a switch detection unit, an inverter unit, an alternating current switch and a controller; the input end of the direct current switch is used for being connected with a direct current power supply, and the output end of the direct current switch is connected with the input end of the inversion unit; the switch detection unit is used for detecting the switch state of the direct current switch; the output end of the inversion unit is connected to an alternating current power grid through the alternating current switch; the controller is respectively connected with the switch detection unit, the inversion unit and the alternating current switch; referring to fig. 3, the apparatus applied to the controller includes:
the state signal receiving unit 301 is configured to receive a state signal of the dc switch sent by the switch detecting unit when the group of series photovoltaic inverter systems needs to be stopped emergently;
a status signal detection unit 302, configured to detect a status signal of the dc switch;
and an emergency stop control unit 303, configured to output a disconnection signal to the ac switch to turn off the ac switch and stop supplying power to the ac power grid if it is detected that the state signal of the dc switch is switched from the on state to the off state.
In an embodiment of the present invention, the emergency stop control unit 303 is further configured to stop outputting the PWM signal to the inverter unit while outputting the turn-off signal to the ac switch, so as to stop operating the inverter unit.
Fig. 4 is a schematic structural diagram of a controller according to an embodiment of the present invention. As shown in fig. 4, the controller 40 of this embodiment includes: a processor 60, a memory 61, and a computer program 62, such as a string photovoltaic inverter system emergency stop control program, stored in the memory 61 and executable on the processor 60. The processor 60 executes the computer program 62 to implement the steps in the above-mentioned embodiments of the emergency stop control method for the string-type pv inverter system, such as the steps 201 to 203 shown in fig. 2.
Illustratively, the computer program 62 may be partitioned into one or more modules/units that are stored in the memory 61 and executed by the processor 60 to implement the present invention. The one or more modules/units may be a series of computer program instruction segments capable of performing specific functions, which are used to describe the execution of the computer program 62 in the controller 40. For example, the computer program 62 may be divided into a state signal receiving unit 301, a state signal detecting unit 302, and an emergency stop control unit 303.
The controller 40 may be a computing device such as a desktop computer, a notebook, a palm computer, and a cloud server. The controller may include, but is not limited to, a processor 60, a memory 61. Those skilled in the art will appreciate that fig. 4 is merely an example of a controller 40 and does not constitute a limitation on the controller 40 and may include more or fewer components than shown, or some components in combination, or different components, e.g., the controller may also include input-output devices, network access devices, buses, etc.
The Processor 60 may be a Central Processing Unit (CPU), other general purpose Processor, a Digital Signal Processor (DSP), an Application Specific Integrated Circuit (ASIC), an off-the-shelf Programmable Gate Array (FPGA) or other Programmable logic device, discrete Gate or transistor logic, discrete hardware components, etc. A general purpose processor may be a microprocessor or the processor may be any conventional processor or the like.
The memory 61 may be an internal storage unit of the controller 40, such as a hard disk or a memory of the controller 40. The memory 61 may also be an external storage device of the controller 40, such as a plug-in hard disk, a Smart Media Card (SMC), a Secure Digital (SD) Card, a Flash memory Card (Flash Card), and the like, provided on the controller 40. Further, the memory 61 may also include both an internal storage unit of the controller 40 and an external storage device. The memory 61 is used for storing the computer programs and other programs and data required by the controller. The memory 61 may also be used to temporarily store data that has been output or is to be output.
It will be apparent to those skilled in the art that, for convenience and brevity of description, only the above-mentioned division of the functional units and modules is illustrated, and in practical applications, the above-mentioned function distribution may be performed by different functional units and modules according to needs, that is, the internal structure of the apparatus is divided into different functional units or modules to perform all or part of the above-mentioned functions. Each functional unit and module in the embodiments may be integrated in one processing unit, or each unit may exist alone physically, or two or more units are integrated in one unit, and the integrated unit may be implemented in a form of hardware, or in a form of software functional unit. In addition, specific names of the functional units and modules are only for convenience of distinguishing from each other, and are not used for limiting the protection scope of the present application. The specific working processes of the units and modules in the system may refer to the corresponding processes in the foregoing method embodiments, and are not described herein again.
In the above embodiments, the descriptions of the respective embodiments have respective emphasis, and reference may be made to the related descriptions of other embodiments for parts that are not described or illustrated in a certain embodiment.
Those of ordinary skill in the art will appreciate that the various illustrative elements and algorithm steps described in connection with the embodiments disclosed herein may be implemented as electronic hardware or combinations of computer software and electronic hardware. Whether such functionality is implemented as hardware or software depends upon the particular application and design constraints imposed on the implementation. Skilled artisans may implement the described functionality in varying ways for each particular application, but such implementation decisions should not be interpreted as causing a departure from the scope of the present invention.
In the embodiments provided in the present invention, it should be understood that the disclosed apparatus/terminal device and method may be implemented in other ways. For example, the above-described embodiments of the apparatus/terminal device are merely illustrative, and for example, the division of the modules or units is only one logical division, and there may be other divisions when actually implemented, for example, a plurality of units or components may be combined or integrated into another system, or some features may be omitted, or not executed. In addition, the shown or discussed mutual coupling or direct coupling or communication connection may be an indirect coupling or communication connection through some interfaces, devices or units, and may be in an electrical, mechanical or other form.
The units described as separate parts may or may not be physically separate, and parts displayed as units may or may not be physical units, may be located in one place, or may be distributed on a plurality of network units. Some or all of the units can be selected according to actual needs to achieve the purpose of the solution of the embodiment.
In addition, functional units in the embodiments of the present invention may be integrated into one processing unit, or each unit may exist alone physically, or two or more units are integrated into one unit. The integrated unit can be realized in a form of hardware, and can also be realized in a form of a software functional unit.
The integrated modules/units, if implemented in the form of software functional units and sold or used as separate products, may be stored in a computer readable storage medium. Based on such understanding, all or part of the flow of the method according to the embodiments of the present invention may also be implemented by a computer program, which may be stored in a computer-readable storage medium, and when the computer program is executed by a processor, the steps of the method embodiments may be implemented. . Wherein the computer program comprises computer program code, which may be in the form of source code, object code, an executable file or some intermediate form, etc. The computer-readable medium may include: any entity or device capable of carrying the computer program code, recording medium, usb disk, removable hard disk, magnetic disk, optical disk, computer Memory, Read-Only Memory (ROM), Random Access Memory (RAM), electrical carrier wave signals, telecommunications signals, software distribution medium, and the like. It should be noted that the computer readable medium may contain content that is subject to appropriate increase or decrease as required by legislation and patent practice in jurisdictions, for example, in some jurisdictions, computer readable media does not include electrical carrier signals and telecommunications signals as is required by legislation and patent practice.
The above-mentioned embodiments are only used for illustrating the technical solutions of the present invention, and not for limiting the same; although the present invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; such modifications and substitutions do not substantially depart from the spirit and scope of the embodiments of the present invention, and are intended to be included within the scope of the present invention.
Claims (10)
1. The emergency stop control method of the string type photovoltaic inverter system is characterized in that the string type photovoltaic inverter system comprises a direct current switch, a switch detection unit, an inverter unit, an alternating current switch and a controller; the input end of the direct current switch is used for being connected with a direct current power supply, and the output end of the direct current switch is connected with the input end of the inversion unit; the switch detection unit is used for detecting the switch state of the direct current switch, and the linkage of the switch detection unit and the direct current switch is a mechanical mode; the output end of the inversion unit is connected to an alternating current power grid through the alternating current switch; the controller is respectively connected with the switch detection unit, the inversion unit and the alternating current switch; the method is applied to the controller and comprises the following steps:
when the group of series photovoltaic inverter systems need emergency shutdown, receiving the state signals of the direct current switches sent by the switch detection unit;
detecting a state signal of the direct current switch;
and if the state signal of the direct current switch is detected to be switched from the connection state to the disconnection state, outputting a disconnection signal to the alternating current switch so as to enable the alternating current switch to be switched off and stop supplying power to the alternating current power grid.
2. The emergency stop control method for the string-type photovoltaic inverter system according to claim 1, wherein while outputting the turn-off signal to the ac switch, the method further comprises:
and stopping outputting the PWM signal to the inversion unit so as to stop the operation of the inversion unit.
3. The emergency stop control method of the string-type photovoltaic inverter system according to claim 1, wherein the controller is a Digital Signal Processing (DSP) controller.
4. The emergency stop control device of the string type photovoltaic inverter system is characterized in that the string type photovoltaic inverter system comprises a direct current switch, a switch detection unit, an inverter unit, an alternating current switch and a controller; the input end of the direct current switch is used for being connected with a direct current power supply, and the output end of the direct current switch is connected with the input end of the inversion unit; the switch detection unit is used for detecting the switch state of the direct current switch, and the linkage of the switch detection unit and the direct current switch is a mechanical mode; the output end of the inversion unit is connected to an alternating current power grid through the alternating current switch; the controller is respectively connected with the switch detection unit, the inversion unit and the alternating current switch; the device is applied to the controller and comprises:
the state signal receiving unit is used for receiving the state signal of the direct-current switch sent by the switch detection unit when the group of series photovoltaic inverter systems needs emergency shutdown;
the state signal detection unit is used for detecting a state signal of the direct current switch;
and the emergency stop control unit is used for outputting a disconnection signal to the alternating current switch to enable the alternating current switch to be switched off and stop supplying power to the alternating current power grid if the condition signal of the direct current switch is detected to be switched from the connection condition to the disconnection condition.
5. The emergency stop control device of the string-type photovoltaic inverter system according to claim 4, wherein the emergency stop control unit is further configured to stop outputting the PWM signal to the inverter unit while outputting the turn-off signal to the ac switch, so as to stop operating the inverter unit.
6. The emergency stop control device of the string-type photovoltaic inverter system according to claim 4, wherein the controller is a DSP controller.
7. A string-type photovoltaic inverter system, comprising: the group-string photovoltaic inverter system comprises a direct current switch, a switch detection unit, an inverter unit, an alternating current switch and a controller; the input end of the direct current switch is used for being connected with a direct current power supply, and the output end of the direct current switch is connected with the input end of the inversion unit; the switch detection unit is used for detecting the switch state of the direct current switch, and the linkage of the switch detection unit and the direct current switch is a mechanical mode; the output end of the inversion unit is connected to an alternating current power grid through the alternating current switch; the controller is respectively connected with the switch detection unit, the inversion unit and the alternating current switch;
when the group of series photovoltaic inverter systems need emergency shutdown, the controller receives the state signals of the direct current switches sent by the switch detection unit;
the controller detects the change state of the state signal of the direct current switch;
and if the controller detects that the state signal of the direct current switch is switched from the connection state to the disconnection state, the controller outputs a disconnection signal to the alternating current switch so as to enable the alternating current switch to be switched off and stop supplying power to the alternating current power grid.
8. The string-type photovoltaic inverter system according to claim 7, wherein the controller stops outputting the PWM signal to the inverter unit to stop the inverter unit from operating while outputting the off signal to the ac switch.
9. The string-type photovoltaic inverter system of claim 7, wherein the controller is a Digital Signal Processing (DSP) controller.
10. A computer-readable storage medium, in which a computer program is stored which, when being executed by a processor, carries out the steps of the method according to any one of claims 1 to 3.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910039669.4A CN109638795B (en) | 2019-01-16 | 2019-01-16 | Emergency stop control method and device for string type photovoltaic inverter system |
Applications Claiming Priority (1)
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| KR100635480B1 (en) * | 2004-08-23 | 2006-10-17 | 한국전기연구원 | A protection method of grid-connected dispersed storage and generating system based on operation characteristics of a recloser |
| CN202817788U (en) * | 2012-08-16 | 2013-03-20 | 阳光电源股份有限公司 | Grid-connected photovoltaic power generation system |
| CN203645346U (en) * | 2013-12-26 | 2014-06-11 | 常熟开关制造有限公司(原常熟开关厂） | Photovoltaic power generation inverter |
| CN204145328U (en) * | 2014-08-12 | 2015-02-04 | 比亚迪股份有限公司 | Photovoltaic DC-to-AC converter and photovoltaic inverting system |
| CN104362843B (en) * | 2014-10-24 | 2017-06-13 | 阳光电源股份有限公司 | Parallel inverter system and its halt control method and stop control apparatus |
| CN104410266B (en) * | 2014-12-18 | 2017-04-19 | 阳光电源股份有限公司 | Stop controlling method and device for five-level inverter |
| CN105846758A (en) * | 2015-01-16 | 2016-08-10 | 台达电子工业股份有限公司 | Photovoltaic power generation system and turn-off device |
| JP6153663B1 (en) * | 2015-11-20 | 2017-06-28 | 田淵電機株式会社 | Relay abnormality detection device and power conditioner |
| CN107769242A (en) * | 2016-08-23 | 2018-03-06 | 台达电子企业管理（上海）有限公司 | Photovoltaic generating system and its cut-off method |
| CN106533148B (en) * | 2016-12-20 | 2019-07-09 | 北京天诚同创电气有限公司 | Photovoltaic DC-to-AC converter with sudden-stop function and the emergency stop method for it |
| CN206775459U (en) * | 2017-02-28 | 2017-12-19 | 阳光电源股份有限公司 | The cutoff device and photovoltaic module turning off system of a kind of photovoltaic module |
| CN206759389U (en) * | 2017-06-07 | 2017-12-15 | 江苏通灵电器股份有限公司 | System is rapidly switched off applied to photovoltaic generation |
| CN109193789B (en) * | 2018-10-30 | 2021-12-14 | 泓芯泰业科技(北京)有限公司 | Inverter for photovoltaic power generation |
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