CN104410106A - Photovoltaic inverter, inverter system and communication networking method for inverter system - Google Patents
Photovoltaic inverter, inverter system and communication networking method for inverter system Download PDFInfo
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Abstract
The invention provides a photovoltaic inverter, an inverter system and a communication networking method for the inverter system. The inverter comprises a direct current detection module, a power conversion module, an alternating current detection module, a control center module, a short-range wireless communication module, a short-range wireless communication control module and a short-range wireless communication mode storage module, wherein the short-range wireless communication module is used for collecting operation data of the inverter and transmitting the operation data to a communicator or transmitting a control command, the operation data or program to the inverter through the communicator; the short-range wireless communication control module is respectively connected with the short-range wireless communication module and the control center module and controls the opening and the closing of communication function of the short-range wireless communication module; the short-range wireless communication mode storage module is respectively connected with the short-range wireless communication module and the short-range wireless communication control module and stores a flag bit of the short-range wireless communication control mode; the modules are respectively powered by an auxiliary power supply connected to the direct current side. The invention provides a convenient and simple networking mode for a large-scale photovoltaic system, so the problem about blocking of a communication channel in the networking process is solved.
Description
Technical field
The present invention relates to the communication technical field of photovoltaic inverter system, specifically, the present invention relates to a kind of constructing communication network method of photovoltaic DC-to-AC converter, inverter system and inverter system.
Background technology
Purple honeybee (ZigBee) is the wireless personal local area network (WPAN based on IEEE 802.15.4 standard, WirelessPersonal Area Network) agreement is also the wireless networking communications technology of a kind of low-power consumption, low cost, high reliability.ZigBee adopts the mode of self-organization network and dynamic routing to set up and maintaining network, and with individual territory net identifier (PANID, Personal Area Network ID) distinguish each independently network, the network under different PANID can independent operating, and does not interfere with each other.
ZigBee (ZB) technology may be used for photovoltaic inverter system, realizes the connection between inverter and communication equipment, completes data transmission and order transmission.Fig. 1 is the module architectures schematic diagram of a kind of photovoltaic inverter system of the prior art.For this photovoltaic inverter system 100, as shown in Figure 1, multiple photovoltaic module 101 connects one to one with multiple stage inverter 102 respectively, then unification is connected to a bus cable and is connected to an AC network (not shown) through grid interface 106.Wherein, a lot of platform inverter 102 is had to be connected with a communicator 103 (communication equipment), each inverter 102 sends the data to communicator 103, and communicator 103 passes outwardly the Internet 104 and is connected with server 105, then realizes monitoring by internal monitoring instrument.In addition, also can be ordered to each inverter 102 by communicator 103, data or program etc.
For Miniature inverter, usually adopt DC power supply.The internal module that Fig. 2 A comprises for a photovoltaic DC-to-AC converter of the prior art and adopt the schematic diagram of DC power supply.As shown in Figure 2 A, this photovoltaic DC-to-AC converter 200 mainly comprises: DC detecting module 201, power switching module 202, interchange detection module 203, control centre's module 204 and short-range wireless communication module 205.Wherein, DC detecting module 201 is connected with a photovoltaic module 211, for detecting DC input voitage and the direct current input current of input photovoltaic DC-to-AC converter 200.Power switching module 202 is connected with ac output end with the direct-flow input end of photovoltaic DC-to-AC converter 200 respectively, for direct current is converted to alternating current.Exchange detection module 203 to be connected with an AC network 212, for detecting the ac output voltage and ac output current that export photovoltaic DC-to-AC converter 200.Control centre's module 204 respectively with DC detecting module 201, exchange detection module 203 and be connected with power switching module 202, for generation of with the drive singal sending to power switching module 202, to realize the alternating current wanted.Short-range wireless communication module 205 can be the communication module arranged based on ZigBee communication network, Z-Wave communication network or Wi-Fi communication network, it is connected with a communicator 213 with control centre module 204 respectively, after service data for collection photovoltaics inverter 200, send to communicator 213, or the control command, service data or the program that are sent to photovoltaic DC-to-AC converter 200 by communicator 213.
In this example, the accessory power supply 221 (DC power supply) that photovoltaic DC-to-AC converter 200 and is connected to the DC output end of photovoltaic module 211 is connected, and is powered by the DC detecting module 201 in accessory power supply 221 pairs of photovoltaic DC-to-AC converters 200, power switching module 202, interchange detection module 203, control centre's module 204 and short-range wireless communication module 205.
Adopt the benefit of DC power supply to be that accessory power supply 221 simplicity of design, efficiency are high, reduce the power consumption that photovoltaic DC-to-AC converter 200 does not run, improve the long-time stability that photovoltaic DC-to-AC converter 200 runs.But, time for employing DC power supply, as long as be connected to photovoltaic module 211, one has light, photovoltaic module 211 output dc voltage, and photovoltaic DC-to-AC converter 200 will power on, and short-range wireless communication module 205 will run, send signal, will busy channel.The single communicator 213 of the photovoltaic inverter system of existing employing short-range wireless communication technologies (such as ZigBee technology) can only corresponding tens photovoltaic DC-to-AC converters 200; And time Iarge-scale system is installed, can only be that communicator 213 and networking are installed one by one.Specifically, photovoltaic DC-to-AC converter 200 and the photovoltaic module 211 of coupling part is required exactly.If the photovoltaic DC-to-AC converter 200 that such as communicator 213 can be corresponding is 50, so just can only connects the photovoltaic module 211 of 50 photovoltaic DC-to-AC converters 200 and their correspondences, then carry out the networking between photovoltaic DC-to-AC converter 200 and communicator 213.After completing this networking, then the photovoltaic DC-to-AC converter 200 carrying out next part is connected with photovoltaic module 211, is then the networking of another communicator 213.This way brings very large inconvenience to installation, is also easy to make mistakes.
In fact, be all that photovoltaic DC-to-AC converter and photovoltaic module have been installed time usual system is installed, connect them at once, after whole system installs, then communicator is installed and carries out networking.When photovoltaic DC-to-AC converter number is a lot, multiple short-range wireless communication module sends information when self-organized network communication more, can cause channel block.And just in case install manufacturer's peace according to after common way done, the short-distance wireless communication of all photovoltaic DC-to-AC converters all enters same channel, after causing obstruction, just must disconnect all photovoltaic DC-to-AC converters to be connected with the direct current cables of photovoltaic module, and then connecting the direct current cables of photovoltaic DC-to-AC converter and photovoltaic module and networking according to description above in batches, this is pretty troublesome.Particularly the roof system under photovoltaic module is arranged on for photovoltaic DC-to-AC converter, even needs mobile photovoltaic module to disconnect the direct current cables joint of photovoltaic DC-to-AC converter and photovoltaic module.
For Miniature inverter, AC power also can be adopted to power to accessory power supply.The internal module that Fig. 2 B comprises for another photovoltaic DC-to-AC converter of the prior art and adopt the schematic diagram of ac power supply.As shown in Figure 2 B, just the same with as shown in Figure 2 A of the internal module structure of this photovoltaic DC-to-AC converter 200, just which employs AC power and powers to accessory power supply 221.And adopt the benefit of ac power supply to be only to start short-distance wireless communication after being connected to alternating current, the problem of above-described channel block can be avoided.But such accessory power supply 221 can bring high, the high in cost of production problem of electric leakage.
Summary of the invention
Technical problem to be solved by this invention is to provide a kind of constructing communication network method of photovoltaic DC-to-AC converter, inverter system and inverter system, can short-distance wireless communication be used to set up into inverter system in the inverter system having multiple stage photovoltaic DC-to-AC converter, realize system group network operation easily, avoid the problem occurring in Iarge-scale system that radio communication channel blocks.And just in case occur that communication channel is blocked, be easy to carry out recovery and networking again.
In order to solve the problems of the technologies described above, the invention provides a kind of photovoltaic DC-to-AC converter, comprising:
DC detecting module, is connected with a photovoltaic module, for detecting the DC input voitage and direct current input current that input described photovoltaic DC-to-AC converter;
Power switching module, is connected with ac output end with the direct-flow input end of described photovoltaic DC-to-AC converter respectively, for direct current is converted to alternating current;
Exchanging detection module, being connected with an AC network, for detecting the ac output voltage and ac output current that export described photovoltaic DC-to-AC converter, as an alternating current detection signal;
Control centre's module, is connected with described power switching module with described DC detecting module, the described detection module that exchanges respectively, for generation of with the drive singal sending to described power switching module, to realize the alternating current wanted;
Short-range wireless communication module, be connected with a communicator with described control centre module respectively, for collect described photovoltaic DC-to-AC converter service data after, send to described communicator, or by control command, service data or program that described communicator sends to described photovoltaic DC-to-AC converter; And
Short-distance wireless communication power module, is connected with described AC network with described short-range wireless communication module respectively, for receiving the electric power of described AC network, powers to described short-range wireless communication module;
Wherein, the accessory power supply that described photovoltaic DC-to-AC converter and is connected to the DC output end of described photovoltaic module is connected, and described DC detecting module, described power switching module, described interchange detection module and described control centre module are all powered by described accessory power supply.
Alternatively, described short-range wireless communication module refers to the communication module arranged based on ZigBee communication network, Z-Wave communication network or Wi-Fi communication network.
Alternatively, described photovoltaic DC-to-AC converter is the control signal of signal as described short-range wireless communication module of the power stage threshold value adopting described alternating current detection signal or reach described photovoltaic DC-to-AC converter.
In order to solve the problems of the technologies described above, the present invention also provides a kind of photovoltaic DC-to-AC converter, comprising:
DC detecting module, is connected with a photovoltaic module, for detecting the DC input voitage and direct current input current that input described photovoltaic DC-to-AC converter;
Power switching module, is connected with ac output end with the direct-flow input end of described photovoltaic DC-to-AC converter respectively, for direct current is converted to alternating current;
Exchanging detection module, being connected with an AC network, for detecting the ac output voltage and ac output current that export described photovoltaic DC-to-AC converter, as an alternating current detection signal;
Control centre's module, is connected with described power switching module with described DC detecting module, the described detection module that exchanges respectively, for generation of with the drive singal sending to described power switching module, to realize the alternating current wanted;
Short-range wireless communication module, is connected with a communicator, for collect described photovoltaic DC-to-AC converter service data after, send to described communicator, or by control command, service data or program that described communicator sends to described photovoltaic DC-to-AC converter;
Short-distance wireless communication control module, is connected, for controlling the opening and closing of the communication function of described short-range wireless communication module with described control centre module with described short-range wireless communication module respectively; And
Short-distance wireless communication pattern storage module, be connected with described short-distance wireless communication control module with described short-range wireless communication module respectively, for storing the flag bit of a short-distance wireless communication control model, described mark potential energy is undertaken arranging and changing by short-distance wireless communication mode by described communicator;
Wherein, the accessory power supply that described photovoltaic DC-to-AC converter and is connected to the DC output end of described photovoltaic module is connected, and described DC detecting module, described power switching module, described interchange detection module, described control centre module, described short-range wireless communication module, described short-distance wireless communication control module and described short-distance wireless communication pattern storage module are all powered by described accessory power supply.
Alternatively, described short-range wireless communication module refers to the communication module arranged based on ZigBee communication network, Z-Wave communication network or Wi-Fi communication network.
Alternatively, described photovoltaic DC-to-AC converter is the control signal of signal as described short-range wireless communication module of the power stage threshold value adopting described alternating current detection signal or reach described photovoltaic DC-to-AC converter.
Alternatively, described short-distance wireless communication control module and/or described short-distance wireless communication pattern storage module are integrated in inside described control centre module, or separate from outside described control centre module.
In order to solve the problems of the technologies described above, the present invention also provides a kind of inverter system adopting above-mentioned photovoltaic DC-to-AC converter to set up, and comprising: corresponding photovoltaic DC-to-AC converter, communicator, server and the grid interface connected of one or more photovoltaic module, one or more and described photovoltaic module; Through being connected with an AC network by described grid interface after described photovoltaic DC-to-AC converter is connected with a bus cable; One end of described communicator is connected with one or more described photovoltaic DC-to-AC converter by a short distance radio communication network, and its other end is connected with described server by the Internet.
In order to solve the problems of the technologies described above, the present invention also provides a kind of constructing communication network method of the inverter system adopting above-mentioned photovoltaic DC-to-AC converter to set up, described constructing communication network method comprises the step that described photovoltaic DC-to-AC converter opens the communication function of short-range wireless communication module, and described step comprises:
A. short-distance wireless communication control module reads the flag bit of a short-distance wireless communication control model of storage from short-distance wireless communication pattern storage module;
B. determine that described short-distance wireless communication control model is " alternating current control model " or " not control model " according to described flag bit; " if alternating current control model ", then go to perform following step C; " if not control model ", then go to perform following step F;
C. exchange detection module and detect an alternating current detection signal;
D. short-distance wireless communication control module receives described alternating current detection signal;
E. judge whether described photovoltaic DC-to-AC converter is connected with the alternating current from AC network, if there is alternating current, then go to perform following step F; If without alternating current, then go to perform following step G;
F. the communication function of described short-range wireless communication module is opened;
G. close the communication function of described short-range wireless communication module, and return above-mentioned steps C.
Alternatively, the mode of opening the communication function of described short-range wireless communication module is external interrupt, serial ports, SPI, wake up, timer or reset.
Alternatively, the mode of the communication function of described short-range wireless communication module is closed for stopping communication or allowing described short-range wireless communication module enter sleep state.
Compared with prior art, the present invention has the following advantages:
The invention provides and facilitate the installation of the communication network of succinct large-scale photovoltaic system (inverter system) and set up mode, make it possible to adopt short-range wireless communication technologies to set up the photovoltaic system comprising a lot of platform photovoltaic DC-to-AC converter, avoid the problem that the communication channel easily occurred in Iarge-scale system networking process is blocked.And just in case occur that communication channel is blocked, be also easy to carry out recovery and networking again.
Accompanying drawing explanation
The above and other features of the present invention, character and advantage become more obvious by passing through below in conjunction with the description of drawings and Examples, wherein:
Fig. 1 is in prior art/the module architectures schematic diagram of a kind of photovoltaic inverter system of one embodiment of the invention;
The internal module that Fig. 2 A comprises for a photovoltaic DC-to-AC converter of the prior art and adopt the schematic diagram of DC power supply;
The internal module that Fig. 2 B comprises for another photovoltaic DC-to-AC converter of the prior art and adopt the schematic diagram of ac power supply;
The schematic diagram of the internal module that the photovoltaic DC-to-AC converter that Fig. 3 is one embodiment of the invention comprises and employing DC power supply thereof;
The schematic diagram of the internal module that the photovoltaic DC-to-AC converter that Fig. 4 is another embodiment of the present invention comprises and employing DC power supply thereof;
Fig. 5 is the flow chart that in the constructing communication network method of the inverter system of one embodiment of the invention, photovoltaic DC-to-AC converter opens the communication function of short-range wireless communication module.
Embodiment
Below in conjunction with specific embodiments and the drawings, the invention will be further described; set forth more details in the following description so that fully understand the present invention; but the present invention obviously can implement with multiple this alternate manner described that is different from; those skilled in the art can when doing similar popularization, deduction without prejudice to when intension of the present invention according to practical situations, therefore should with content constraints protection scope of the present invention of this specific embodiment.
Way of the present invention be make the short-range wireless communication module in the photovoltaic DC-to-AC converter of inverter system can not all one have the situation of direct current supply get down from horse on carry out short-distance wireless communication, thus cause channel bank to block.The mode that the present invention adopts only after connection alternating current, just opens short-distance wireless communication, has the first embodiment and the second embodiment two kinds of modes of following improvement photovoltaic DC-to-AC converter at least.
First embodiment of photovoltaic DC-to-AC converter
The schematic diagram of the internal module that the photovoltaic DC-to-AC converter that Fig. 3 is one embodiment of the invention comprises and employing DC power supply thereof.It should be noted that this and follow-up other accompanying drawing all only exemplarily, it is not draw according to the condition of equal proportion, and should not be construed as limiting in this, as to the protection range of actual requirement of the present invention.As shown in Figure 3, this photovoltaic DC-to-AC converter 300 mainly comprises: DC detecting module 301, power switching module 302, interchange detection module 303, control centre's module 304, short-range wireless communication module 305 and short-distance wireless communication power module 306.Wherein, DC detecting module 301 is connected with a photovoltaic module 311, for detecting DC input voitage and the direct current input current of input photovoltaic DC-to-AC converter 300.Power switching module 302 is connected with ac output end with the direct-flow input end of photovoltaic DC-to-AC converter 300 respectively, for direct current is converted to alternating current.Exchange detection module 303 to be connected with an AC network 312, for detecting the ac output voltage and ac output current that export photovoltaic DC-to-AC converter 300, as an alternating current detection signal.Control centre's module 304 respectively with DC detecting module 301, exchange detection module 303 and be connected with power switching module 302, for generation of with the drive singal sending to power switching module 302, to realize the alternating current wanted.Short-range wireless communication module 305 can be the communication module arranged based on ZigBee communication network, Z-Wave communication network or Wi-Fi communication network, it is connected with a communicator 313 with control centre module 304 respectively, after service data for collection photovoltaics inverter 300, send to communicator 313, or the control command, service data or the program that are sent to photovoltaic DC-to-AC converter 300 by communicator 313.Short-distance wireless communication power module 306 is connected with AC network 312 with short-range wireless communication module 305 respectively, for receiving the electric power of AC network 312, powers to short-range wireless communication module 305.
In the present embodiment, the accessory power supply 321 that photovoltaic DC-to-AC converter 300 and is connected to the DC output end of photovoltaic module 311 is connected, and DC detecting module 301, power switching module 302, interchange detection module 303 and control centre's module 304 are all powered by accessory power supply 321.
In addition, this photovoltaic DC-to-AC converter 300 can be the control signal that the signal of a power stage threshold value adopting alternating current detection signal or reach photovoltaic DC-to-AC converter 300 is used as short-range wireless communication module 305.
Therefore in photovoltaic DC-to-AC converter 300 as shown in Figure 3, short-range wireless communication module 305 adopts independent short-distance wireless communication power module 306, powered by AC.After being only connected to AC network 312, short-range wireless communication module 305 just has power supply supply, just may run.Namely when being only connected to photovoltaic module 311, short-range wireless communication module 305 is still less than what power, can not run.
Second embodiment of photovoltaic DC-to-AC converter
The schematic diagram of the internal module that the photovoltaic DC-to-AC converter that Fig. 4 is another embodiment of the present invention comprises and employing DC power supply thereof.It should be noted that this and follow-up other accompanying drawing all only exemplarily, it is not draw according to the condition of equal proportion, and should not be construed as limiting in this, as to the protection range of actual requirement of the present invention.As shown in Figure 4, this photovoltaic DC-to-AC converter 400 mainly comprises: DC detecting module 401, power switching module 402, interchange detection module 403, control centre's module 404, short-range wireless communication module 405, short-distance wireless communication control module 406 and short-distance wireless communication pattern storage module 407.Wherein, DC detecting module 401 is connected with a photovoltaic module 411, for detecting DC input voitage and the direct current input current of input photovoltaic DC-to-AC converter 400.Power switching module 402 is connected with ac output end with the direct-flow input end of photovoltaic DC-to-AC converter 400 respectively, for direct current is converted to alternating current.Exchange detection module 403 to be connected with an AC network 412, for detecting the ac output voltage and ac output current that export photovoltaic DC-to-AC converter 400, as an alternating current detection signal.Control centre's module 404 respectively with DC detecting module 401, exchange detection module 403 and be connected with power switching module 402, for generation of with the drive singal sending to power switching module 402, to realize the alternating current wanted.Short-range wireless communication module 405 can be the communication module arranged based on ZigBee communication network, Z-Wave communication network or Wi-Fi communication network, it is connected with a communicator 413, after service data for collection photovoltaics inverter 400, send to communicator 413, or the control command, service data or the program that are sent to photovoltaic DC-to-AC converter 400 by communicator 413.Short-distance wireless communication control module 406 is connected, for controlling the opening and closing of the communication function of short-range wireless communication module 405 with control centre module 404 with short-range wireless communication module 405 respectively.Short-distance wireless communication pattern storage module 407 is connected with short-distance wireless communication control module 406 with short-range wireless communication module 405 respectively, for storing the flag bit of a short-distance wireless communication control model, mark potential energy is undertaken arranging and changing by short-distance wireless communication mode by communicator 413.
In the present embodiment, the accessory power supply 421 that photovoltaic DC-to-AC converter 400 and is connected to the DC output end of photovoltaic module 411 is connected, and DC detecting module 401, power switching module 402, interchange detection module 403, control centre's module 404, short-range wireless communication module 405, short-distance wireless communication control module 406 and short-distance wireless communication pattern storage module 407 are all powered by accessory power supply 421.
In addition, this photovoltaic DC-to-AC converter 400 can be the control signal that the signal of a power stage threshold value adopting alternating current detection signal or reach photovoltaic DC-to-AC converter 400 is used as short-range wireless communication module 405.
Therefore in photovoltaic DC-to-AC converter 400 as shown in Figure 4, short-range wireless communication module 405 adopts DC side to power, and added a short-distance wireless communication control module 406, controlled the opening and closing of the communication function of short-range wireless communication module 405.In addition, also have a short-distance wireless communication pattern storage module 407, can the flag bit of short-distance wireless communication control model, this flag bit can be undertaken arranging and changing by short-distance wireless communication mode by communicator 413.In the present embodiment, this short-distance wireless communication control module 406 can be independent, separate from outside control centre's module 404, also can be integrated in software inside control centre's module 404 or hardware.In addition, short-distance wireless communication pattern storage module 407 also can be independent, separate from outside control centre's module 404, also can be integrated in inside control centre's module 404.When the control that short-distance wireless communication control module 406 is connected by alternating current, be easy to carry out short-distance wireless communication and networking in batches.
The embodiment of inverter system
In order to describe for simplicity, the present embodiment continues to use the module architectures schematic diagram of the inverter system shown in Fig. 1.Fig. 1 is the module architectures schematic diagram of a kind of photovoltaic inverter system of one embodiment of the invention, as shown in Figure 1, this inverter system 100 in fact have employed before photovoltaic DC-to-AC converter 300,400 (being still denoted as Reference numeral 102 in FIG) described by Fig. 3, Fig. 4 and setting up.This inverter system 100 mainly comprises: one or more photovoltaic module 101, (platform) or multiple (platform) photovoltaic DC-to-AC converter 102, communicator 103, server 105 and grid interface 106 of connecting corresponding to photovoltaic module 101.Through being connected with an AC network (not shown) by grid interface 106 after photovoltaic DC-to-AC converter 102 is connected with a bus cable (sign).One end of communicator 103 is connected with one or more photovoltaic DC-to-AC converter 102 by a short distance radio communication network, and its other end is connected with server 105 by the Internet 104.This short distance radio communication network can be ZigBee communication network, Z-Wave communication network or Wi-Fi communication network.
The embodiment of the constructing communication network method of inverter system
Fig. 5 is the flow chart of communication function that in the constructing communication network method of the inverter system of one embodiment of the invention, photovoltaic DC-to-AC converter opens short-range wireless communication module, this inverter system 400 photovoltaic DC-to-AC converter 400 and setting up as described in Figure 4 before being employing.The present embodiment has continued to use element numbers and the partial content of aforementioned embodiment as shown in Figure 4, wherein adopts identical label to represent identical or approximate element, and optionally eliminates the explanation of constructed content.Explanation about clipped can refer to previous embodiment, and it is no longer repeated for the present embodiment.
As shown in Figure 5, this constructing communication network method comprises the step that photovoltaic DC-to-AC converter 400 opens the communication function of short-range wireless communication module 405, and those steps comprise:
Perform step S501, short-distance wireless communication control module 406 reads the flag bit of a short-distance wireless communication control model of storage from short-distance wireless communication pattern storage module 407.
Performing step S502, is " alternating current control model " or " not control model " according to flag bit determination short-distance wireless communication control model; " if alternating current control model ", then go to perform following step S503; " if not control model ", then directly go to perform following step S506.
Perform step S503, exchange detection module 403 and detect an alternating current detection signal, and alternating current detection signal is sent to short-distance wireless communication control module 406.Be the control signal adopting alternating current detection signal to be used as follow-up short-range wireless communication module 405 in the present embodiment, but the signal of the power stage threshold value reaching photovoltaic DC-to-AC converter 400 also can be adopted to be used as the control signal of short-range wireless communication module 405.
Perform step S504, short-distance wireless communication control module 406 receives alternating current detection signal.
Perform step S505, judge whether photovoltaic DC-to-AC converter 400 is connected with the alternating current from AC network 412, if there is alternating current, then go to perform following step S506; If without alternating current, then go to perform following step S507.
Perform step S506, open the communication function of short-range wireless communication module 405, and keep.
Perform step S507, close the communication function of short-range wireless communication module 405, and return above-mentioned steps S503.
In the present embodiment, visible, after being connected to photovoltaic DC-to-AC converter 400 and photovoltaic module 411, short-range wireless communication module 405 can have power supply and work, but can not carry out short-distance wireless communication.After being only connected to AC network 412, detecting alternating current detection signal, just open short range wireless communication function, send and accept short-distance wireless communication signal.
In addition, the mode of the communication function of above-mentioned unlatching short-range wireless communication module 405 can be external interrupt, serial ports, SPI, wake (Wake-Up), timer up or reset modes such as (Reset); The mode of closing the communication function of short-range wireless communication module 405 can for stopping communication or allowing short-range wireless communication module 405 enter sleep state.
Above method ensures, after photovoltaic DC-to-AC converter is communicated with AC network, just may start short-distance wireless communication exactly.In system is installed, can go up alternating current, last consignment of electricity, organizes a secondary net in batches.These photovoltaic DC-to-AC converters just had corresponding communicator individual territory net identifier (PANID, forms a network, each network each other network layer be isolation, be shared channel at physical layer.Upper alternating current has been come by close circuit breaker, and operation is very easy to, and in Iarge-scale system is installed, be all go up alternating current to check ruuning situation usually in batches, is just easy to carry out the operation of communicator and networking so such.
Suppose that the photovoltaic DC-to-AC converter number of units maximum in same PANID network system has restriction, such as 200.Supposing that the same channel lower node number of physical layer has maximum restriction, is such as 1000.Communicator number so in same system mostly is 1000/200=5 most, namely 5 PANID network systems.
When the channel of communicator is fixing 1, the photovoltaic DC-to-AC converter number of units maximum in same PANID network system is exactly maximum photovoltaic DC-to-AC converter number of units that a communicator can be corresponding.Same channel lower node number has maximum restriction, is exactly the maximum number of units of photovoltaic DC-to-AC converter using cochannel communication.If the short-distance wireless communication in same photovoltaic system is all same channel, all communicator are all identical short-distance wireless communication channels, and the maximum number of units of photovoltaic DC-to-AC converter so in this system is exactly this restriction.
Just in case install manufacturer misoperation, make a lot of photovoltaic DC-to-AC converter run short-distance wireless communication simultaneously, block channel, as long as disconnect the alternating current of these photovoltaic DC-to-AC converters, again go up alternating current and networking is just passable in batches.
In networking process, can be Automatic inquirying photovoltaic DC-to-AC converter numbering, also can be manually input photovoltaic DC-to-AC converter numbering, then connect networking.
In such as ZigBee technology, always have 16 channels.The channel of the communicator of producing is certain given at random channel, in such same system, the same area, communicator and photovoltaic DC-to-AC converter all adopt the probability of same channel greatly to reduce, and so can the photovoltaic DC-to-AC converter number of units of networking just considerably increase before channel block.Such as 16 channels, the maximum limit of each channel is made as 1000, and so maximum in this inverter system photovoltaic DC-to-AC converter number of units is exactly 16 × 1000=16000 platform.
Another kind of situation, can arrange the function of manually setting channel in communicator.Each communicator has the possibility of 16 channels, so can adopt the method arranging different passage, can the photovoltaic DC-to-AC converter number of units of networking just considerably increase before channel block.
Another situation, can arrange the function of setting channel automatically, if find that corresponding channel is crowded, just switch to other channel in communicator.
In the above embodiment of the present invention, main description is adopt alternating current detection signal as the control signal of short-range wireless communication module, but also can adopt other control signals that can play same effect.Such as to reach the signal of a certain power stage threshold value as control signal, only just open short range wireless communication function when inverter has some power stage.When not connecting AC network, although photovoltaic DC-to-AC converter being connected to photovoltaic module, can not running, namely almost there is no power.Like this, when not connecting AC network, the communication function of short-range wireless communication module can not be opened.
In addition, what describe in the present invention is photovoltaic miniature inverter system, but is also applicable to the system that other have similar functions, such as optimizer system or assemblies monitor device system.
In sum, the invention provides and facilitate the installation of the communication network of succinct large-scale photovoltaic system (inverter system) and set up mode, make it possible to adopt short-range wireless communication technologies to set up the photovoltaic system comprising a lot of platform photovoltaic DC-to-AC converter, avoid the problem that the communication channel easily occurred in Iarge-scale system networking process is blocked.And just in case occur that communication channel is blocked, be also easy to carry out recovery and networking again.
Although the present invention with preferred embodiment openly as above, it is not that any those skilled in the art without departing from the spirit and scope of the present invention, can make possible variation and amendment for limiting the present invention.Therefore, every content not departing from technical solution of the present invention, any amendment done above embodiment according to technical spirit of the present invention, equivalent variations and modification, all fall within protection range that the claims in the present invention define.
Claims (10)
1. a photovoltaic DC-to-AC converter (300), comprising:
DC detecting module (301), is connected with a photovoltaic module (311), for detecting DC input voitage and the direct current input current of the described photovoltaic DC-to-AC converter of input (300);
Power switching module (302), is connected with ac output end with the direct-flow input end of described photovoltaic DC-to-AC converter (300), respectively for direct current is converted to alternating current;
Exchange detection module (303), be connected with an AC network (312), for detecting the ac output voltage and ac output current that export described photovoltaic DC-to-AC converter (300), as an alternating current detection signal;
Control centre's module (304), be connected with described power switching module (302) with described DC detecting module (301), the described detection module (303) that exchanges respectively, for generation of with the drive singal sending to described power switching module (302), to realize the alternating current wanted;
Short-range wireless communication module (305), be connected with a communicator (313) with described control centre module (304) respectively, for collect described photovoltaic DC-to-AC converter (300) service data after, send to described communicator (313), or by control command, service data or program that described communicator (313) sends to described photovoltaic DC-to-AC converter (300); And
Short-distance wireless communication power module (306), be connected with described AC network (312) with described short-range wireless communication module (305) respectively, for receiving the electric power of described AC network (312), power to described short-range wireless communication module (305);
Wherein, the accessory power supply (321) that described photovoltaic DC-to-AC converter (300) and is connected to the DC output end of described photovoltaic module (311) is connected, and described DC detecting module (301), described power switching module (302), described interchange detection module (303) and described control centre module (304) are all powered by described accessory power supply (321).
2. photovoltaic DC-to-AC converter according to claim 1 (300), it is characterized in that, described short-range wireless communication module (305) refers to the communication module arranged based on ZigBee communication network, Z-Wave communication network or Wi-Fi communication network.
3. photovoltaic DC-to-AC converter according to claim 2 (300), it is characterized in that, described photovoltaic DC-to-AC converter (300) is the control signal of signal as described short-range wireless communication module (305) of the power stage threshold value adopting described alternating current detection signal or reach described photovoltaic DC-to-AC converter (300).
4. a photovoltaic DC-to-AC converter (400), comprising:
DC detecting module (401), is connected with a photovoltaic module (411), for detecting DC input voitage and the direct current input current of the described photovoltaic DC-to-AC converter of input (400);
Power switching module (402), is connected with ac output end with the direct-flow input end of described photovoltaic DC-to-AC converter (400), respectively for direct current is converted to alternating current;
Exchange detection module (403), be connected with an AC network (412), for detecting the ac output voltage and ac output current that export described photovoltaic DC-to-AC converter (400), as an alternating current detection signal;
Control centre's module (404), be connected with described power switching module (402) with described DC detecting module (401), the described detection module (403) that exchanges respectively, for generation of with the drive singal sending to described power switching module (402), to realize the alternating current wanted;
Short-range wireless communication module (405), be connected with a communicator (413), for collect described photovoltaic DC-to-AC converter (400) service data after, send to described communicator (413), or by control command, service data or program that described communicator (413) sends to described photovoltaic DC-to-AC converter (400);
Short-distance wireless communication control module (406), be connected with described control centre module (404) with described short-range wireless communication module (405) respectively, for controlling the opening and closing of the communication function of described short-range wireless communication module (405); And
Short-distance wireless communication pattern storage module (407), be connected with described short-distance wireless communication control module (406) with described short-range wireless communication module (405) respectively, for storing the flag bit of a short-distance wireless communication control model, described mark potential energy is undertaken arranging and changing by short-distance wireless communication mode by described communicator (413);
Wherein, the accessory power supply (421) that described photovoltaic DC-to-AC converter (400) and is connected to the DC output end of described photovoltaic module (411) is connected, and described DC detecting module (401), described power switching module (402), described interchange detection module (403), described control centre module (404), described short-range wireless communication module (405), described short-distance wireless communication control module (406) and described short-distance wireless communication pattern storage module (407) are all powered by described accessory power supply (421).
5. photovoltaic DC-to-AC converter according to claim 4 (400), it is characterized in that, described short-range wireless communication module (405) refers to the communication module arranged based on ZigBee communication network, Z-Wave communication network or Wi-Fi communication network.
6. photovoltaic DC-to-AC converter according to claim 5 (400), it is characterized in that, described photovoltaic DC-to-AC converter (400) is the control signal of signal as described short-range wireless communication module (405) of the power stage threshold value adopting described alternating current detection signal or reach described photovoltaic DC-to-AC converter (400).
7. photovoltaic DC-to-AC converter according to claim 6 (400), it is characterized in that, described short-distance wireless communication control module (406) and/or described short-distance wireless communication pattern storage module (407) are integrated in described control centre module (404) the inside, or separate from outside described control centre module (404).
8. one kind adopts the photovoltaic DC-to-AC converter (300 according to any one of the claims 1 to 7,400) inverter system (100) set up, comprising: corresponding photovoltaic DC-to-AC converter (102), communicator (103), server (105) and the grid interface (106) connected of one or more photovoltaic module (101), one or more and described photovoltaic module (101); Through being connected with an AC network by described grid interface (106) after described photovoltaic DC-to-AC converter (102) is connected with a bus cable; One end of described communicator (103) is connected with one or more described photovoltaic DC-to-AC converter (102) by a short distance radio communication network, and its other end is connected with described server (105) by the Internet (104).
9. the constructing communication network method of the inverter system (100) adopting the photovoltaic DC-to-AC converter according to any one of the claims 4 to 7 (400) to set up, described constructing communication network method comprises the step that described photovoltaic DC-to-AC converter (400) opens the communication function of short-range wireless communication module (405), and described step comprises:
A. short-distance wireless communication control module (406) reads the flag bit of the short-distance wireless communication control model stored from short-distance wireless communication pattern storage module (407);
B. determine that described short-distance wireless communication control model is " alternating current control model " or " not control model " according to described flag bit; " if alternating current control model ", then go to perform following step C; " if not control model ", then go to perform following step F;
C. exchange detection module (403) and detect an alternating current detection signal;
D. short-distance wireless communication control module (406) receives described alternating current detection signal;
E. judge whether described photovoltaic DC-to-AC converter (400) is connected with the alternating current from AC network (412), if there is alternating current, then go to perform following step F; If without alternating current, then go to perform following step G;
F. the communication function of described short-range wireless communication module (405) is opened;
G. close the communication function of described short-range wireless communication module (405), and return above-mentioned steps C.
10. the constructing communication network method of inverter system according to claim 9 (100), is characterized in that:
The mode of opening the communication function of described short-range wireless communication module (405) is external interrupt, serial ports, SPI, wake up, timer or reset;
Close the mode of the communication function of described short-range wireless communication module (405) for stopping communication or allowing described short-range wireless communication module (405) enter sleep state.
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