CN110661295B - Inverter and photovoltaic power generation system - Google Patents
Inverter and photovoltaic power generation system Download PDFInfo
- Publication number
- CN110661295B CN110661295B CN201910977512.6A CN201910977512A CN110661295B CN 110661295 B CN110661295 B CN 110661295B CN 201910977512 A CN201910977512 A CN 201910977512A CN 110661295 B CN110661295 B CN 110661295B
- Authority
- CN
- China
- Prior art keywords
- inverter
- grid
- generation system
- power generation
- power
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
Images
Classifications
-
- Y—GENERAL 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
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E10/00—Energy generation through renewable energy sources
- Y02E10/50—Photovoltaic [PV] energy
- Y02E10/56—Power conversion systems, e.g. maximum power point trackers
Abstract
The invention provides an inverter and a photovoltaic power generation system, wherein a grid-connected protection device is connected to the alternating current side of the inverter, the grid-connected protection device can control the grid-connected protection device to be in a disconnected state after detecting a power utilization risk phenomenon in the photovoltaic system, so that the inverter is disconnected from a power utilization network, and meanwhile, the grid-connected protection device sends a shutdown signal to an inverter main body to stop the inverter main body. The photovoltaic power generation system using the inverter is guaranteed to run safely, electric shock of a user is avoided, and power utilization safety is improved. Meanwhile, the operation state of the photovoltaic power generation system is controlled according to the electric parameters in the power utilization network, and finally the photovoltaic power generation system is enabled to realize zero-feed network operation and safe and stable operation.
Description
Technical Field
The invention belongs to the technical field of photovoltaic power generation, and particularly relates to an inverter and a photovoltaic power generation system.
Background
With the rapid development of photovoltaic power generation and the rapid reduction of the cost of photovoltaic power generation, a household photovoltaic power generation system becomes an important form of photovoltaic power generation. The household photovoltaic power generation is connected to the power system mainly through a mode of self-generation and self-use and surplus power internet surfing.
The existing household photovoltaic power generation system also has more problems, for example, the difference between the photovoltaic power generation power and the household power consumption power is large, most of the photovoltaic power generation cannot be consumed indoors, and the photovoltaic power generation is incorporated into a power grid in a form of surfing the internet through surplus power, but the surplus power can bring challenges to the power grid consumption. If the photovoltaic power generation system operates as an off-grid power supply, the photovoltaic system is overloaded due to the input of high-load equipment, and the system cannot operate stably. Moreover, the current household photovoltaic power generation system has safety risk of electric shock.
Disclosure of Invention
In view of this, the present invention provides an inverter and a photovoltaic power generation system, so as to solve the technical problem that the conventional household photovoltaic inverter has a safety risk of electric shock. The specific technical scheme is as follows:
in a first aspect, the present invention provides an inverter comprising: the system comprises an inverter main body and a grid-connected protection device;
the inverter main body and the grid-connected protection device are communicated in a power carrier communication mode,
the grid-connected protection device is connected between the inverter main body and the power utilization network, and when the grid-connected protection device detects a power utilization risk or a shutdown control signal, the grid-connected protection device is controlled to be in a disconnected state so that the inverter main body is disconnected from the power utilization network, and a shutdown signal is sent to the inverter main body so that the inverter main body is stopped.
Optionally, an arc discharge detection module, an earth leakage protection module, an insulation detection module and an isolated breaking device are arranged in the grid-connected protection device;
when the arc discharge detection module detects that arc discharge is generated at the grid-connected protection device, the isolated breaking device is controlled to be disconnected, and a shutdown signal is generated to stop the inverter main body;
when the leakage protection module detects that leakage current exists in a circuit where the grid-connected protection device is located, the isolation type breaking device is controlled to be disconnected, and a shutdown signal is generated to stop the inverter main body;
when the insulation detection module detects that the insulation of the grid-connected protection device is abnormal, the isolation type breaking device is controlled to be disconnected, and a shutdown signal is generated to stop the inverter main body.
Optionally, an emergency stop button is arranged on the grid-connected protection device;
and when the grid-connected protection device detects that the emergency stop button is pressed, the grid-connected protection device generates the turn-off control signal.
Optionally, the grid-connected protection device is a protection plug provided with a plug head, the plug head includes a ground plug head connected with a ground wire, a live wire plug head connected with a live wire, and a neutral wire plug head connected with a neutral wire, the length of the ground plug head is longest, the length of the neutral wire plug head is shortest, and the length of the live wire plug head is between the ground plug head and the neutral wire plug head.
Optionally, the grid-connected protection device is connected with the inverter main body through a plug;
alternatively, the first and second electrodes may be,
and the grid-connected protection device is integrally connected with the inverter main body.
In a second aspect, the present invention also provides a photovoltaic power generation system, comprising: a photovoltaic array, an electric energy meter, and an inverter according to any one of the possible implementations of the first aspect;
the direct current side of the inverter is connected with at least one photovoltaic array, the alternating current side of the inverter is connected with a power utilization network, and a grid-connected protection device of the inverter is connected between the inverter main body and the power utilization network;
the electric energy meter is arranged between the power utilization network and the alternating current public power grid, and the electric energy meter is communicated with the inverter in a power carrier communication mode.
Optionally, the system further comprises an isolation protection switch;
the isolation protection switch is arranged between the power utilization network and the alternating current public power grid, wherein a power carrier communication module is arranged in the isolation protection switch;
the inverter controls the isolation protection switch to be switched off when the voltage signal monitored by the electric energy meter is smaller than or equal to a voltage threshold value according to the received voltage signal of the alternating current public power grid side; and when the voltage signal is greater than the voltage threshold, controlling the isolation protection switch to be conducted.
Optionally, the system further comprises: a load switch;
the load switch is connected between the power utilization network and the grid-connected protection device;
under the condition of controlling the isolation protection switch to be switched off, the inverter obtains the load power of the power utilization network;
when the current operation load power of the power utilization network is greater than or equal to the governed maximum load power of the photovoltaic power generation system, controlling partial load switches to be switched off so as to enable the load power of the power utilization network to be matched with the output power of the photovoltaic power generation system;
and when the current operation load power is smaller than the subordinate maximum load power of the photovoltaic power generation system, the inverter adjusts the output power to be matched with the current operation load power.
Optionally, the photovoltaic power generation system further comprises: and the energy storage battery is connected with the direct current side of the inverter.
Optionally, the isolation protection switch is integrated in the electric energy meter;
or the isolation protection switch and the electric energy meter are mutually independent.
According to the inverter provided by the invention, the grid-connected protection device is connected to the alternating current side of the inverter, and can control the grid-connected protection device to be in a disconnected state after detecting the power utilization risk phenomenon in the photovoltaic system, so that the inverter is disconnected from a power utilization network, and meanwhile, the grid-connected protection device sends a shutdown signal to the inverter main body to stop the inverter main body. The photovoltaic power generation system where the inverter is located is ensured to run safely, electric shock of a user is avoided, and power utilization safety is improved. Meanwhile, the operation state of the photovoltaic power generation system is controlled according to the electric parameters in the power utilization network, and finally the photovoltaic power generation system is enabled to realize zero-feed network operation and safe and stable operation.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to these drawings without creative efforts.
FIG. 1 is a schematic diagram of a photovoltaic power generation system provided by the present invention;
fig. 2 is a schematic plan view of a protection plug according to the present invention;
fig. 3 is a schematic perspective view of a protection plug according to the present invention;
FIG. 4 is a schematic diagram of another photovoltaic power generation system provided by the present invention;
FIG. 5 is a schematic structural diagram of another photovoltaic power generation system provided by the present invention;
FIG. 6 is a schematic diagram of a photovoltaic power generation system according to yet another embodiment of the present invention;
FIG. 7 is a schematic structural diagram of yet another photovoltaic power generation system provided by the present invention;
fig. 8 is a schematic structural diagram of an isolation protection switch provided in the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are some, but not all embodiments of the present invention. All other embodiments, which can be obtained by a person skilled in the art without making any creative effort based on the embodiments in the present invention, belong to the protection scope of the present invention.
In one aspect, the present invention provides an inverter including an inverter main body and a grid-connected protection device. The structure and the operation principle of the inverter provided by the invention will be described in detail below in conjunction with a photovoltaic power generation system using the inverter.
Referring to fig. 1, a schematic structural diagram of a photovoltaic power generation system provided by the present invention is shown, the system includes a photovoltaic array, an inverter and an electric energy meter.
The inverter mainly includes an inverter main body 1 and a grid-connected protection device 2.
Wherein, all be provided with power line carrier communication (PLC) module in inverter main body 1 and the protection device 2 that is incorporated into the power networks, consequently, can communicate through PLC communication module between inverter main body 1 and the protection device 2 that is incorporated into the power networks. Therefore, communication cables do not need to be additionally arranged, communication is directly achieved through power cables and modulation and demodulation, and communication connection among all parts of the system is greatly simplified.
The grid-connected protection device 2 is connected between the ac sides of the inverter main body 1.
The grid-connected protection device 2 can detect whether electricity utilization risks exist in the photovoltaic power generation system, and after the electricity utilization risks exist in the system, the grid-connected protection device 2 is controlled to be in a disconnected state, so that the inverter main body 1 is disconnected from a power grid for a user, meanwhile, a shutdown signal is sent to the inverter main body 1, so that the inverter main body 1 is stopped, and the inverter is prevented from being damaged.
In an embodiment of the present invention, the grid-connected protection device is a protection plug with a plug head, please refer to fig. 2, which is a schematic structural diagram of a protection plug, as shown in fig. 2, the protection plug includes: bolt head 21, protection control cavity 22, inverter plug 23.
The plug head 21 is connected to a consumer network, which in this embodiment is a domestic electricity network, and therefore the plug head 21 comprises a live plug L connected to the live line of the domestic electricity network, a neutral plug N connected to the neutral line, and a ground plug PE connected to the ground line.
Wherein, the protection control cavity 22 is internally provided with an isolated breaking device, an arc discharge detection module, a plug and a PLC communication module.
The isolated breaking device is used for realizing connection/disconnection between the photovoltaic power generation system and a power utilization network.
The isolated breaking device may be a normally closed contactor, or may also be a breaking device having an electrical isolation function, such as a miniature circuit breaker, which is not limited herein. For convenience of description, the normally closed contactor will be described as an example.
The arc discharge detection module is used for detecting whether arc discharge exists in the photovoltaic power generation system or not, and controlling the normally closed contactor to be switched off if the arc discharge exists so as to control the grid-connected protection device to be switched off; meanwhile, a shutdown signal is generated and sent to the inverter main body through the PLC communication module, and the inverter main body stops after receiving the shutdown signal.
The arc discharge refers to that voltage exceeds the tolerance of air to enable the air to be ionized to become conductors to generate electric arcs, and arc discharge is formed between the two conductors. For example, when the photovoltaic power generation system is operated, the protection plug is directly unplugged, and an arc discharge phenomenon occurs at the moment.
In a possible implementation, the length of the ground pin PE is the longest, the length of the neutral pin N is the shortest, and the length of the live pin L is between the two pins. If the user directly pulls out the bolt head 21 under photovoltaic power generation system operating condition, at this moment, the bolt head that length changes in proper order makes the arc discharge take place on N line (promptly, zero line) at first, and this bolt head 21 does not leave the socket of family with the electric wire netting completely when the arc discharge takes place, consequently, the arc discharge monitoring module in this protection plug can detect the arc discharge and take place, and the disconnection of control normally closed contactor, simultaneously, sends shutdown signal so that the dc-to-ac converter main part is shut down.
In addition, the protection plug can also comprise an insulation detection module and a lightning protection module; the insulation monitoring module is used for detecting whether insulation impedance of the photovoltaic power generation system is abnormal or not, if the insulation impedance is abnormal, the normally closed contactor is controlled to be disconnected, and meanwhile, a shutdown signal is sent to the inverter main body to enable the inverter main body to be shut down. The lightning protection module is used for discharging huge current generated by lightning stroke when the photovoltaic power generation system is struck by the lightning so as to protect the safety of the photovoltaic power generation system.
In one possible embodiment, the protection plug is connected to the inverter body by a plug-in connection, i.e. the protection plug is connected to the ac output of the inverter body via the inverter plug 23.
In other possible implementation manners, the protection plug and the inverter are designed in an integrated manner, namely, the protection plug cannot be detached from the inverter main body, so that the electric shock risk when the protection plug and the inverter main body are plugged can be avoided.
Preferably, as shown in fig. 2 and 3, the protection plug may further be provided with an emergency stop button 24, when a user needs to deactivate the photovoltaic power generation system, the emergency stop button is pressed, the internal normally closed contactor is opened, and a shutdown signal is generated and sent to the inverter main body, so that the inverter main body is stopped. If pull out bolt head 21 this moment, can effectively solve and draw the arc risk, and the metal part of bolt head 21 is reliably protected, thoroughly avoids live-wire operation's risk.
Preferably, a human-machine interface 25 is also provided on the protection control cavity 22, on which certain information of the protection plug can be displayed.
In addition, the inverter body 1 controls its own operation parameters and controls the generated power to realize zero-feed operation according to the received electrical parameters (such as voltage, power, etc.) in the power grid.
The zero-feed network operation means that electric energy generated by the photovoltaic power generation system is not transmitted to the AC public power network side.
Preferably, the photovoltaic power generation system shown in fig. 1 may further include an energy storage device, such as an energy storage battery, for storing excess electric energy into the energy storage battery when the photovoltaic array is operating and the generated electric energy is greater than the electric energy consumed by the load; when the photovoltaic array does not work, the energy storage battery can supply power to the load; the utilization rate of the photovoltaic power generation system is improved.
According to the inverter provided by the embodiment, the grid-connected protection device is connected to the alternating current side of the inverter main body, can detect the electricity utilization risk phenomenon in a photovoltaic system, and controls the plug to be in a disconnected state after the electricity utilization risk phenomenon is detected, so that the inverter is disconnected from an electricity utilization network; meanwhile, a shutdown signal is sent to the inverter main body to stop the inverter main body. The photovoltaic power generation system using the inverter is guaranteed to run safely, electric shock of a user is avoided, and power utilization safety is improved. Meanwhile, the operation parameters of the photovoltaic power generation system are controlled according to the electric parameters in the power utilization network, and finally the photovoltaic power generation system can realize zero-feed network operation and safe and stable operation.
In another aspect, the invention further provides a photovoltaic power generation system using the inverter.
Referring to fig. 4, a schematic structural diagram of a photovoltaic power generation system provided by the present invention is shown, and the system further includes a load switch 3 and an isolation protection switch 4 based on the embodiment shown in fig. 1.
The load switch 3 is connected between the grid-connected inverter protection device 2 and a power grid (i.e., a consumer grid).
Furthermore, a PLC communication module is provided inside the load switch 3. The inverter body 1 and the load switch 3 communicate with each other through a PLC communication module.
The inverter main body 1 controls the power load connected to the photovoltaic power generation system in the power grid by controlling the on/off state of the load switch 3.
The isolation protection switch 4 is arranged between the power utilization network and the alternating current public power grid. And, all be provided with PLC communication module in the isolation protection switch 4.
Further, an electric energy meter 5 is usually provided between the utility grid and the ac public utility grid, and the electric energy meter 5 detects electric parameters (for example, voltage, power, and the like) on the ac public utility grid side, and a PLC communication module is provided in the electric energy meter 5, and the detected electric parameters of the ac public utility grid are fed back to the inverter main body 1 through the PLC communication module.
The inverter main body 1 judges whether the alternating current public power grid loses power according to the monitoring result of the electric energy meter 5, and further controls the on/off state of the isolation protection switch 4 according to the judgment result of whether the alternating current public power grid loses power so as to enable the photovoltaic power generation system to operate in an island operation mode.
The island operation mode is that the photovoltaic power generation system is disconnected with the AC public power grid side to form an independent micro-grid system, and the photovoltaic power generation system generates electric energy and provides the electric energy for loads in a power utilization network to achieve stability and balance.
The process of switching the photovoltaic power generation system to the islanding operation mode will be described in detail below:
if the electric energy meter 5 detects that the voltage signal at the side of the alternating current public power grid is less than or equal to the voltage threshold value, indicating that the alternating current public power grid loses power, at the moment, determining that the photovoltaic power generation system needs to supply power for the load in the power utilization network.
Further judging whether the total load power of the power utilization network is greater than the governed maximum load power of the photovoltaic power generation system; if the output power of the photovoltaic power generation system is larger than or equal to the preset output power, the output power of the photovoltaic power generation system is not enough to supply power for all loads in the power utilization network, so that part of load switches are controlled to be disconnected, the current power utilization load is reduced, the output power of the photovoltaic power generation system is matched with the connected loads, and the off-grid stable operation of the photovoltaic power generation system is realized. If less than, the on-state of the individual load switches is maintained, i.e. the photovoltaic power generation system can supply all the loads in the electricity utilization network.
Specifically, which load switches are disconnected can be determined according to the difference between the total load power and the governed maximum load power and the power of the load connected to each load switch.
Meanwhile, the inverter main body 1 controls the isolation protection switch 4 to be disconnected through the PLC communication module, so that the isolated island protection of the photovoltaic power generation system is realized, and the condition of network feeding of the power grid power loss condition is avoided.
The governed maximum load of the photovoltaic power generation system refers to the overall maximum output power of the photovoltaic power generation system, and the maximum value of the load power of the system in stable operation can be obtained through calculation according to the maximum power of the inverter, the photovoltaic power and the system power factor.
The total load of the power utilization network is the total power of all loads in the household power grid, and the total load of the power utilization network in the embodiment comprises two parts, namely the power of the household point of the power utilization network and the current output power of the photovoltaic power generation system, namely the sum of the load supplied by the alternating current public power grid and the load supplied by the photovoltaic power generation system.
In addition, in order to realize that the photovoltaic power generation system stably operates in the island operation mode, the photovoltaic power generation system needs to be provided with an energy storage battery 6.
When the photovoltaic array works and the generated electric energy is larger than the electric energy consumed by the load, the redundant electric energy is stored in the energy storage battery; when the photovoltaic array does not work at night, the energy storage battery supplies power for the load connected to the photovoltaic power generation system in the power utilization network, so that the photovoltaic power generation system can stably run in an island operation mode.
It should be noted that if an isolation protection switch capable of communicating with the inverter is not arranged between the ac public power grid and the photovoltaic power generation system, the photovoltaic power generation system cannot realize islanding operation.
As shown in fig. 5, the photovoltaic power generation system is different from the photovoltaic power generation system shown in fig. 4 in that an isolation protection switch is not provided between the ac public power grid and the photovoltaic power generation system, and therefore, the photovoltaic system and the ac public power grid cannot be disconnected; moreover, the system is not provided with an energy storage device, so that isolated island operation cannot be realized.
The photovoltaic power generation system shown in fig. 6 is different from the photovoltaic power generation system shown in fig. 4 in that an isolation protection switch is not provided between the ac public power grid and the photovoltaic power generation system, and therefore, the photovoltaic system and the ac public power grid cannot be disconnected, and therefore, islanding operation cannot be realized.
The photovoltaic power generation system shown in fig. 7 is different from the photovoltaic power generation system shown in fig. 4 in that the system is not provided with an energy storage device, and therefore, the photovoltaic power generation system can be disconnected from an ac public power grid, but the photovoltaic power generation system is not provided with an energy storage device, and therefore, the photovoltaic power generation system cannot stably operate in an island operation mode.
In one embodiment of the invention, the load switch 3 comprises a three/two-hole socket, a PLC communication module, a switching device.
Wherein the three-hole/two-hole socket is used for connecting loads in a consumer network. The PLC communication module is used for realizing PLC communication between the load switch 3 and the inverter main body 1. The on-off control of the load switch 3 is realized by the on-off device.
After receiving the on-off control signal transmitted by the inverter main body 1, the PLC communication module in the load switch 3 controls the on-off state of the on-off device, and finally the load in the power utilization network is connected to the photovoltaic power generation system or disconnected from the photovoltaic power generation system.
In another embodiment, a power detection module, such as a voltage sensor, a power sensor, etc., is disposed in the load switch 3, and the power detection module is used to collect information such as voltage, power, etc., of a currently connected load, and transmit the information to the inverter main body 1 through the PLC communication module.
In one application scenario, a plurality of loads (i.e., electrical devices, such as various home devices) are usually included in the power network, and the plurality of loads are distributed at different locations. Therefore, one load switch may be provided for each load, so that the photovoltaic power generation system can independently control the on/off state of each load.
In one embodiment, the inverter body 1 may determine which loads can be connected to the photovoltaic power generation system according to the output power of the photovoltaic power generation system and the power of each load in the power grid. In other embodiments, the inverter body 1 may determine the load connected to the photovoltaic power generation system according to the output power of the photovoltaic power generation system, the power of each load in the power utilization network, and the power utilization level requirement of the load. For example, a load that cannot be powered down has a higher power usage level than a load that can be powered down.
In a possible implementation manner of the present invention, as shown in fig. 8, the isolation protection switch 4 includes a switch main body, a PLC communication module, and a transformer; the switch main body can be a mechanical air switch and/or an electric switching-on/off switch mechanism.
In one embodiment of the present invention, the isolation protection switch 4 may be integrated inside the electric energy meter device 5, so as to reduce wiring and facilitate installation for users; in another embodiment of the present invention, the isolation protection switch 4 and the electric energy meter device 5 are independent.
In the embodiment, the photovoltaic power generation system is disconnected from the alternating current public power grid side by controlling the isolation protection switch 4, so that the grid feeding phenomenon under the condition of power loss of the alternating current public power grid is avoided; the grid feeding means that the photovoltaic power generation system transmits electric energy to an alternating current public power grid. Meanwhile, the load power of the photovoltaic power generation system connected into the power utilization network is controlled through the load switch, so that the load power of the photovoltaic power generation system connected into the power utilization network is matched with the power generation power of the photovoltaic power generation system, and the photovoltaic power generation system can stably operate independently of an alternating current public power grid.
It should be noted that, in the present specification, the embodiments are all described in a progressive manner, each embodiment focuses on differences from other embodiments, and the same and similar parts among the embodiments may be referred to each other. For the device-like embodiment, since it is basically similar to the method embodiment, the description is simple, and for the relevant points, reference may be made to the partial description of the method embodiment.
The steps in the method of the embodiments of the present application may be sequentially adjusted, combined, and deleted according to actual needs.
The device and the modules and sub-modules in the terminal in the embodiments of the present application can be combined, divided and deleted according to actual needs.
In the several embodiments provided in the present application, it should be understood that the disclosed terminal, apparatus and method may be implemented in other manners. For example, the above-described terminal embodiments are merely illustrative, and for example, the division of a module or a sub-module is only one logical division, and there may be other divisions when the terminal is actually implemented, for example, a plurality of sub-modules or modules may be combined or integrated into another module, 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 modules, and may be in an electrical, mechanical or other form.
The modules or sub-modules described as separate parts may or may not be physically separate, and parts that are modules or sub-modules may or may not be physical modules or sub-modules, may be located in one place, or may be distributed over a plurality of network modules or sub-modules. Some or all of the modules or sub-modules can be selected according to actual needs to achieve the purpose of the solution of the present embodiment.
In addition, each functional module or sub-module in the embodiments of the present application may be integrated into one processing module, or each module or sub-module may exist alone physically, or two or more modules or sub-modules may be integrated into one module. The integrated modules or sub-modules may be implemented in the form of hardware, or may be implemented in the form of software functional modules or sub-modules.
Finally, it should also be noted that, in this document, relational terms such as first and second, and the like are used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Also, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising an … …" does not exclude the presence of other identical elements in a process, method, article, or apparatus that comprises the element.
The previous description of the disclosed embodiments is provided to enable any person skilled in the art to make or use the present invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other embodiments without departing from the spirit or scope of the invention. Thus, the present invention is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.
The foregoing is only a preferred embodiment of the present invention, and it should be noted that, for those skilled in the art, various modifications and decorations can be made without departing from the principle of the present invention, and these modifications and decorations should also be regarded as the protection scope of the present invention.
Claims (10)
1. An inverter, for use in a household photovoltaic power generation system, the inverter comprising: the system comprises an inverter main body and a grid-connected protection device;
the inverter main body and the grid-connected protection device are communicated in a power carrier communication mode;
the grid-connected protection device is connected between the inverter main body and a power utilization network, the grid-connected protection device is a protection plug, and the protection plug comprises a plug pin head used for connecting the power utilization network, an inverter plug used for connecting the alternating current output end of the inverter main body and a protection control cavity;
the circuit in the protection control cavity is used for controlling the grid-connected protection device to be in a disconnected state to disconnect the inverter main body from a power utilization network and sending a shutdown signal to the inverter main body to stop the inverter main body when the fact that the power utilization risk exists in the household photovoltaic power generation system or after the fact that the shutdown control signal is detected;
the lengths of the bolt heads respectively connected with the ground wire, the live wire and the zero line are different, so that the bolt heads are pulled down in the operating state of the photovoltaic power generation system, the bolt heads with the sequentially changed lengths enable arc discharge to firstly occur on the zero line, and the bolt heads do not completely leave a socket of a household power grid when the arc discharge occurs, and then an arc discharge monitoring module in the protection plug can detect the occurrence of the arc discharge, control the grid-connected protection device to be disconnected, and simultaneously send a shutdown signal to stop the inverter main body.
2. The inverter according to claim 1, wherein an arc discharge detection module, a leakage protection module, an insulation detection module and an isolated breaking device are arranged in the protection control cavity;
when the arc discharge detection module detects that arc discharge is generated at the grid-connected protection device, the isolated breaking device is controlled to be disconnected, and a shutdown signal is generated to stop the inverter main body;
when the leakage protection module detects that leakage current exists in a circuit where the grid-connected protection device is located, the isolation type breaking device is controlled to be disconnected, and a shutdown signal is generated to stop the inverter main body;
when the insulation detection module detects that the insulation of the grid-connected protection device is abnormal, the isolation type breaking device is controlled to be disconnected, and a shutdown signal is generated to stop the inverter main body.
3. The inverter according to claim 1 or 2, wherein the protection control cavity is provided with an emergency stop button;
and when the grid-connected protection device detects that the emergency stop button is pressed, the grid-connected protection device generates the turn-off control signal.
4. The inverter according to claim 1 or 2, wherein the pin head comprises a ground pin head connected to ground, a live pin head connected to live wire and a neutral pin head connected to neutral wire, and wherein the length of the ground pin head is the longest and the length of the neutral pin head is the shortest, and wherein the length of the live pin head is between the ground pin head and the neutral pin head.
5. The inverter according to claim 1, wherein the inverter plug of the protection plug is detachably connected to the ac output terminal of the inverter main body by plugging;
alternatively, the first and second electrodes may be,
and the inverter plug of the protection plug is connected with the alternating current output end of the inverter main body in a non-detachable and integrated manner.
6. A photovoltaic power generation system, comprising: a photovoltaic array, an electric energy meter, and the inverter of any one of claims 1-5;
the direct current side of the inverter is connected with at least one photovoltaic array, the alternating current side of the inverter is connected with an electricity utilization network, and a grid-connected protection device of the inverter is connected between the inverter main body and the electricity utilization network;
the electric energy meter is arranged between the power utilization network and the alternating current public power grid, and the electric energy meter is communicated with the inverter in a power carrier communication mode.
7. The photovoltaic power generation system of claim 6, further comprising an isolation protection switch;
the isolation protection switch is arranged between the power utilization network and the alternating current public power grid, wherein a power carrier communication module is arranged in the isolation protection switch;
the inverter controls the isolation protection switch to be switched off when the voltage signal monitored by the electric energy meter is smaller than or equal to a voltage threshold value according to the received voltage signal of the alternating current public power grid side; and when the voltage signal is greater than the voltage threshold, controlling the isolation protection switch to be conducted.
8. The photovoltaic power generation system of claim 7, further comprising: a load switch;
the load switch is connected between a power utilization network and the grid-connected protection device;
under the condition of controlling the isolation protection switch to be switched off, the inverter obtains the load power of the power utilization network;
when the current operation load power of the power utilization network is greater than or equal to the subordinate maximum load power of the photovoltaic power generation system, controlling part of load switches to be disconnected so as to enable the load power of the power utilization network to be matched with the output power of the photovoltaic power generation system;
and when the current operation load power is smaller than the subordinate maximum load power of the photovoltaic power generation system, the inverter adjusts the output power to be matched with the current operation load power.
9. The photovoltaic power generation system according to any one of claims 6 to 8, further comprising: and the energy storage battery is connected with the direct current side of the inverter.
10. Photovoltaic power generation system according to any of claims 6-8, characterized in that an isolation protection switch is integrated in the electric energy meter;
or the isolation protection switch and the electric energy meter are mutually independent.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910977512.6A CN110661295B (en) | 2019-10-15 | 2019-10-15 | Inverter and photovoltaic power generation system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910977512.6A CN110661295B (en) | 2019-10-15 | 2019-10-15 | Inverter and photovoltaic power generation system |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN110661295A CN110661295A (en) | 2020-01-07 |
| CN110661295B true CN110661295B (en) | 2022-07-15 |
Family
ID=69040918
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201910977512.6A Active CN110661295B (en) | 2019-10-15 | 2019-10-15 | Inverter and photovoltaic power generation system |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN110661295B (en) |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP3979450A1 (en) * | 2020-10-05 | 2022-04-06 | Fronius International GmbH | Photovoltaic system |
| CN113746131B (en) * | 2021-08-06 | 2023-11-03 | 万帮数字能源股份有限公司 | Inverter parallel system and zero feed network control method thereof |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2002354678A (en) * | 2001-05-29 | 2002-12-06 | Canon Inc | Power generating device, and its control method |
| CN101621205A (en) * | 2009-08-13 | 2010-01-06 | 合肥阳光电源有限公司 | Grid-combination operation method of photovoltaic grid-combination inverter containing transformer at AC side |
Family Cites Families (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP4160919B2 (en) * | 2004-03-24 | 2008-10-08 | シャープ株式会社 | Inverter device |
| CN103280827B (en) * | 2013-04-24 | 2016-01-20 | 广东志高空调有限公司 | The control system that blended electric power room air conditioner uses and control method thereof |
| CN103439546A (en) * | 2013-07-26 | 2013-12-11 | 国家电网公司 | Electric energy measuring system and method for low-voltage user photovoltaic power generation |
| 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 |
| CN104716667A (en) * | 2015-01-06 | 2015-06-17 | 青岛龙庆达电气有限公司 | Control system for photovoltaic grid connected protector |
| CN104730423A (en) * | 2015-04-07 | 2015-06-24 | 嘉兴金尚节能科技有限公司 | Island effect detecting method of grid-connected photovoltaic power system |
| CN207819564U (en) * | 2017-11-29 | 2018-09-04 | 丰郅(上海)新能源科技有限公司 | Failure monitoring system with current detection function |
-
2019
- 2019-10-15 CN CN201910977512.6A patent/CN110661295B/en active Active
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2002354678A (en) * | 2001-05-29 | 2002-12-06 | Canon Inc | Power generating device, and its control method |
| CN101621205A (en) * | 2009-08-13 | 2010-01-06 | 合肥阳光电源有限公司 | Grid-combination operation method of photovoltaic grid-combination inverter containing transformer at AC side |
Also Published As
| Publication number | Publication date |
|---|---|
| CN110661295A (en) | 2020-01-07 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| US11183851B1 (en) | Apparatus and method for AC and DC power co-distribution | |
| WO2012146907A3 (en) | Power demand management on a low voltage network with a plurality of intelligent sockets | |
| CN110661295B (en) | Inverter and photovoltaic power generation system | |
| CN110190585B (en) | B-type residual current monitoring and action circuit breaker with wireless transmission function | |
| CN202633675U (en) | Intelligent socket with detection control | |
| CN110635447B (en) | Tripping control unit, electric leakage module and safe direct current Internet of things protection switch | |
| CN203352273U (en) | Power supply system | |
| JP6147402B1 (en) | DC power distribution system | |
| CN202585951U (en) | Power socket accessible into internet of things | |
| CN201717670U (en) | Dual-power-supply switching device with overvoltage protection | |
| CN209823504U (en) | Automatic switching system for control power supply of low-voltage contact cabinet | |
| CN202662913U (en) | Intelligent socket | |
| CN109274173A (en) | A kind of dual redundant power supply system | |
| CN211376559U (en) | Circuit breaker | |
| US10992168B2 (en) | Apparatus of power distribution and method of power distribution | |
| CN212435042U (en) | Circuit breaker and contactless switch combined programmable power distribution device | |
| CN216355500U (en) | Collection flow box | |
| CN216699241U (en) | Device for preventing 220V generator power supply from mistakenly transmitting power to municipal power grid in reverse direction | |
| CN208368893U (en) | A kind of power distribution socket | |
| CN217956704U (en) | Light stores up microgrid system based on electric automobile | |
| CN218498811U (en) | Electrical apparatus plug control break-make structure and safe break-make structure | |
| CN103779840B (en) | Connection cutting system | |
| CN103384053A (en) | Electrical device protective circuit | |
| KR101444803B1 (en) | A Grid Connection System Using Multi-path Transfer Switch | |
| CN214379130U (en) | Direct current socket control circuit and direct current socket |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| CB02 | Change of applicant information |
Address after: High tech Zone of Hefei city of Anhui Province in 230088 Lake Road No. 2 Applicant after: Sunshine New Energy Development Co.,Ltd. Address before: High tech Zone of Hefei city of Anhui Province in 230088 Lake Road No. 2 Applicant before: Sunshine New Energy Development Co.,Ltd. Address after: High tech Zone of Hefei city of Anhui Province in 230088 Lake Road No. 2 Applicant after: Sunshine New Energy Development Co.,Ltd. Address before: 230088 6th floor, R & D center building, no.1699 Xiyou Road, high tech Zone, Hefei City, Anhui Province Applicant before: HEFEI SUNGROW RENEWABLE ENERGY SCI. & TECH. Co.,Ltd. |
|
| CB02 | Change of applicant information | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant |