CN114465358A - Distributed photovoltaic inverter control system and method - Google Patents
Distributed photovoltaic inverter control system and method Download PDFInfo
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J13/00—Circuit arrangements for providing remote indication of network conditions, e.g. an instantaneous record of the open or closed condition of each circuitbreaker in the network; Circuit arrangements for providing remote control of switching means in a power distribution network, e.g. switching in and out of current consumers by using a pulse code signal carried by the network
- H02J13/00006—Circuit arrangements for providing remote indication of network conditions, e.g. an instantaneous record of the open or closed condition of each circuitbreaker in the network; Circuit arrangements for providing remote control of switching means in a power distribution network, e.g. switching in and out of current consumers by using a pulse code signal carried by the network characterised by information or instructions transport means between the monitoring, controlling or managing units and monitored, controlled or operated power network element or electrical equipment
- H02J13/00007—Circuit arrangements for providing remote indication of network conditions, e.g. an instantaneous record of the open or closed condition of each circuitbreaker in the network; Circuit arrangements for providing remote control of switching means in a power distribution network, e.g. switching in and out of current consumers by using a pulse code signal carried by the network characterised by information or instructions transport means between the monitoring, controlling or managing units and monitored, controlled or operated power network element or electrical equipment using the power network as support for the transmission
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J13/00—Circuit arrangements for providing remote indication of network conditions, e.g. an instantaneous record of the open or closed condition of each circuitbreaker in the network; Circuit arrangements for providing remote control of switching means in a power distribution network, e.g. switching in and out of current consumers by using a pulse code signal carried by the network
- H02J13/00001—Circuit arrangements for providing remote indication of network conditions, e.g. an instantaneous record of the open or closed condition of each circuitbreaker in the network; Circuit arrangements for providing remote control of switching means in a power distribution network, e.g. switching in and out of current consumers by using a pulse code signal carried by the network characterised by the display of information or by user interaction, e.g. supervisory control and data acquisition systems [SCADA] or graphical user interfaces [GUI]
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J13/00—Circuit arrangements for providing remote indication of network conditions, e.g. an instantaneous record of the open or closed condition of each circuitbreaker in the network; Circuit arrangements for providing remote control of switching means in a power distribution network, e.g. switching in and out of current consumers by using a pulse code signal carried by the network
- H02J13/00006—Circuit arrangements for providing remote indication of network conditions, e.g. an instantaneous record of the open or closed condition of each circuitbreaker in the network; Circuit arrangements for providing remote control of switching means in a power distribution network, e.g. switching in and out of current consumers by using a pulse code signal carried by the network characterised by information or instructions transport means between the monitoring, controlling or managing units and monitored, controlled or operated power network element or electrical equipment
- H02J13/00016—Circuit arrangements for providing remote indication of network conditions, e.g. an instantaneous record of the open or closed condition of each circuitbreaker in the network; Circuit arrangements for providing remote control of switching means in a power distribution network, e.g. switching in and out of current consumers by using a pulse code signal carried by the network characterised by information or instructions transport means between the monitoring, controlling or managing units and monitored, controlled or operated power network element or electrical equipment using a wired telecommunication network or a data transmission bus
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J13/00—Circuit arrangements for providing remote indication of network conditions, e.g. an instantaneous record of the open or closed condition of each circuitbreaker in the network; Circuit arrangements for providing remote control of switching means in a power distribution network, e.g. switching in and out of current consumers by using a pulse code signal carried by the network
- H02J13/00006—Circuit arrangements for providing remote indication of network conditions, e.g. an instantaneous record of the open or closed condition of each circuitbreaker in the network; Circuit arrangements for providing remote control of switching means in a power distribution network, e.g. switching in and out of current consumers by using a pulse code signal carried by the network characterised by information or instructions transport means between the monitoring, controlling or managing units and monitored, controlled or operated power network element or electrical equipment
- H02J13/00028—Circuit arrangements for providing remote indication of network conditions, e.g. an instantaneous record of the open or closed condition of each circuitbreaker in the network; Circuit arrangements for providing remote control of switching means in a power distribution network, e.g. switching in and out of current consumers by using a pulse code signal carried by the network characterised by information or instructions transport means between the monitoring, controlling or managing units and monitored, controlled or operated power network element or electrical equipment involving the use of Internet protocols
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J13/00—Circuit arrangements for providing remote indication of network conditions, e.g. an instantaneous record of the open or closed condition of each circuitbreaker in the network; Circuit arrangements for providing remote control of switching means in a power distribution network, e.g. switching in and out of current consumers by using a pulse code signal carried by the network
- H02J13/00032—Systems characterised by the controlled or operated power network elements or equipment, the power network elements or equipment not otherwise provided for
- H02J13/00036—Systems characterised by the controlled or operated power network elements or equipment, the power network elements or equipment not otherwise provided for the elements or equipment being or involving switches, relays or circuit breakers
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J3/00—Circuit arrangements for ac mains or ac distribution networks
- H02J3/38—Arrangements for parallely feeding a single network by two or more generators, converters or transformers
- H02J3/381—Dispersed generators
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- H—ELECTRICITY
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- H04B—TRANSMISSION
- H04B3/00—Line transmission systems
- H04B3/54—Systems for transmission via power distribution lines
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L12/00—Data switching networks
- H04L12/28—Data switching networks characterised by path configuration, e.g. LAN [Local Area Networks] or WAN [Wide Area Networks]
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- H04W12/00—Security arrangements; Authentication; Protecting privacy or anonymity
- H04W12/03—Protecting confidentiality, e.g. by encryption
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J2300/00—Systems for supplying or distributing electric power characterised by decentralized, dispersed, or local generation
- H02J2300/20—The dispersed energy generation being of renewable origin
- H02J2300/22—The renewable source being solar energy
- H02J2300/24—The renewable source being solar energy of photovoltaic origin
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Abstract
The invention provides a distributed photovoltaic inverter control system and a distributed photovoltaic inverter control method, wherein the system comprises a plurality of photovoltaic inverters, an internet of things switch and an intelligent fusion terminal; and the photovoltaic inverters are connected with the intelligent fusion terminal through the internet of things switch respectively. The problems that a remote control scheduling instruction of the photovoltaic inverter is difficult to realize, safety performance is insufficient, and active and reactive power regulation capacity is not fully utilized are solved. Combine intelligent integration terminal and thing to ally oneself with the switch, carry out data relay communication mode through photovoltaic inverter hand-in-hand communication mode and thing to ally oneself with the switch based on the instruction, promote communication efficiency, reduce initial stage construction cost, guarantee information communication safety simultaneously, realize platform district power balance and voltage intelligence management and control.
Description
Technical Field
The invention relates to the technical field of electrical control and intelligent power distribution, in particular to a distributed photovoltaic inverter control system and a distributed photovoltaic inverter control method.
Background
The photovoltaic inverter is an inverter which can convert variable direct-current voltage generated by a photovoltaic solar panel into alternating current with commercial power frequency. With the propulsion of energy transformation and the development of power distribution technology, distributed photovoltaics present a development pattern of high-speed development of installed scale. The traditional photovoltaic inverter is generally connected with a power distribution network in a direct connection mode, maximum power point tracking and given power factor operation are realized by means of a control device of the photovoltaic inverter, and remote control over the electrical quantity of the photovoltaic inverter is realized by means of a wireless public network or short-distance wireless Bluetooth communication mode.
With the rapid development of distributed power supplies represented by distributed photovoltaics, large-scale distributed photovoltaics are connected into a power distribution network, and great influence is caused on the aspects of voltage level, short-circuit capacity, relay protection, power supply reliability, electric energy quality and the like of the power distribution network. The traditional passive and passive power distribution network has lower access perception and remote control capability on the photovoltaic inverter, usually utilizes a wireless public network or short-distance wireless Bluetooth communication mode to realize remote control on the electrical quantity of the photovoltaic inverter, and has lower safety performance because a remote control scheduling instruction on the photovoltaic inverter is difficult to realize.
In the existing distributed photovoltaic inverter control technology, a low-voltage power distribution network is usually accessed in a mode of independently and disorderly adjusting grid-connected alternating-current voltage, active power, reactive power, power factor and power generation capacity for each photovoltaic inverter. The following disadvantages exist in use:
1. information such as the power generation amount of the photovoltaic inverter accessed to the power distribution network in the adjacent area is not considered by each photovoltaic inverter, and the independent and unorganized adjustment of the photovoltaic inverters can cause the voltage fluctuation and the active power fluctuation of the power distribution network, so that the power quality of the power distribution network is reduced.
2. With the increase of the power load, the reactive demand of the power distribution network is increased, although the photovoltaic inverter has the functions of reactive power regulation and power factor regulation, the photovoltaic inverter cannot acquire the real-time reactive demand of the low-voltage power distribution network, usually, the specific power factor of the photovoltaic inverter is ensured, and the reactive regulation capability of the photovoltaic inverter is wasted.
The problems are all considered when the large-scale distributed photovoltaic inverter is connected into a low-voltage distribution network.
In addition, the grid-connected point voltage of the photovoltaic inverter is usually detected for the photovoltaic inverter in the existing distributed photovoltaic inverter control technology, the grid-connected condition is met, then the grid-connected point voltage is directly connected to a power distribution network, remote control is realized through APP developed by manufacturers, and the following defects exist in the use process:
1. each photovoltaic inverter is directly connected to the low-voltage distribution network only by detecting the voltage of the grid-connected point of the photovoltaic inverter. The power distribution network master station has insufficient sensing capability on the photovoltaic inverter access and running state.
2. The remote control of the photovoltaic inverter is generally controlled by adopting a wireless public network or a Bluetooth mode, information security encryption is not considered, and the remote control is easily attacked by communication aiming at the distributed photovoltaic inverter.
3. The communication between the power distribution network master station and the photovoltaic inverter is not established, the remote scheduling control and protection functions cannot be realized, grid-connected operation is realized only by depending on the operation strategy and the protection strategy of the photovoltaic inverter, and the active power peak regulation and reactive power compensation capacity of the photovoltaic inverter is wasted.
The problems are all considered when the large-scale distributed photovoltaic inverter is connected into a low-voltage distribution network.
Therefore, a solution for improving the measurable, controllable and safe performance of the photovoltaic inverter is urgently needed.
Disclosure of Invention
Aiming at the defects and shortcomings in the prior art, the invention provides a distributed photovoltaic inverter control system and method, and solves the problems that a remote control scheduling instruction of a photovoltaic inverter is difficult to realize, the safety performance is insufficient, and the active and reactive power regulation capability is not fully utilized. Combine intelligent integration terminal and thing to ally oneself with the switch, carry out data relay communication mode through photovoltaic inverter hand-in-hand communication mode and thing to ally oneself with the switch based on the instruction, promote communication efficiency, reduce initial stage construction cost, guarantee information communication safety simultaneously, realize platform district power balance and voltage intelligence management and control.
The invention specifically adopts the following technical scheme:
a distributed photovoltaic inverter control system, comprising: the system comprises a plurality of photovoltaic inverters, an internet of things switch and an intelligent fusion terminal; and the photovoltaic inverters are connected with the intelligent fusion terminal through the internet of things switch respectively.
Further, each of the photovoltaic inverters is provided with: the inverter controller is provided with at least 2 RS485 interfaces; the thing allies oneself with the switch and has connected at least: the system comprises an RS485 communication module and an HPLC carrier communication module, wherein the RS485 communication module is provided with at least 2 RS485 interfaces; the photovoltaic inverters and the Internet of things switch are connected by hands through RS485 interfaces to form a looped network; and the intelligent fusion terminal is connected with the Internet of things switch through HPLC.
Further, the power output end of the internet of things switch is electrically connected with a 380V distribution network of the transformer area, and the power input end of the internet of things switch is electrically connected with the photovoltaic inverter.
Furthermore, the photovoltaic inverter is respectively connected with an inverter control device and a data acquisition device, and the inverter control device is respectively connected with the data acquisition device, a data calculation device and a data transmission device; the display device is respectively connected with the data acquisition device and the data transmission device.
Furthermore, a safety encryption chip is embedded in the intelligent fusion terminal and used for supporting the self protection of the terminal; the thing allies oneself with the switch and is provided with safe encryption chip, extends thing allies oneself with switch data acquisition side with the safe boundary of photovoltaic regulation and control data communication.
Further, the data acquisition device incorporates a three-phase photovoltaic inverter into the voltage of the alternating current power distribution networkU a 、U b 、U c Current merging into an AC distribution networki al 、i bl 、i cl Photovoltaic direct voltage, photovoltaic direct currenti dc The collection and give inverter control device, inverter control device and data calculating device cooperation are calculated and are obtained current generated energy, active power, reactive power and power factor electric capacity data, send for the thing through data transmission device and ally oneself with the switch to give display device with relevant display data transmission, to the data that needn't calculate, include: voltage of three-phase photovoltaic inverter incorporated in AC distribution networkU a 、U b 、U c Current merging into an AC distribution networki al 、i bl 、i cl Photovoltaic direct voltage, photovoltaic direct currenti dc The data acquisition device directly sends the data to the display device, and the display device displays real-time photovoltaic inverter running state data; the data of each photovoltaic inverter is collected by the internet of things switch, the data packet content uploaded by each photovoltaic inverter is locally analyzed through an RS485 communication module of the internet of things switch, whether photovoltaic inverter running state data which do not meet grid-connected requirements exist is judged, protection action is carried out on the spot, and the data packet is packaged into a data format which is adaptive to an HPLC communication mode and is transmitted to the intelligent fusion terminal.
Furthermore, the intelligent fusion terminal responds to a scheduling instruction or locally calculates given values of grid-connected voltage, generated energy, active power, reactive power and power factor of each photovoltaic inverter so as to meet the functions of stabilizing alternating voltage, suppressing active power fluctuation, uniformly compensating reactive power and centrally adjusting power factor in the region; the intelligent integration terminal issues given values of grid-connected voltage, generated energy, active power, reactive power and power factor of each photovoltaic inverter to the Internet of things switch in a communication mode of HPLC, the Internet of things switch distributes the given values of the photovoltaic inverters to corresponding photovoltaic inverters and matched control devices thereof, and the inverter control devices adjust internal control parameters and driving signals according to the obtained given values of the grid-connected voltage, the generated energy, the active power, the reactive power and the power factor, so that the purpose of adjusting the grid-connected voltage, the generated energy, the active power, the reactive power and the power factor according to scheduling requirements is achieved.
Further, the data communication method comprises the following steps:
step S1: when the photovoltaic inverter device is ready to be merged into a power distribution network for power generation, the photovoltaic inverter device collects photovoltaic input voltage, input current, output voltage and output current electrical quantity data, calculates and obtains current generated energy, active power, reactive power and power factor electrical quantity data, and packs the data and sends the data to an internet of things switch according to an RS485 mode;
step S21: the current photovoltaic operation data that is sent by photovoltaic inverter device according to RS485 communication mode is gathered to the communication module of thing allies oneself with the switch, at local analytic data package, and current generated energy, active power, reactive power and the electric volume data message of power factor are analyzed, judge whether need carry out the protection action on the spot, include: island protection, overload protection, overvoltage protection and undervoltage protection; packing the data packet according to an HPLC communication mode and sending the data packet to an intelligent fusion terminal;
step S3: the intelligent integration terminal uploads a data packet to a cloud master station after acquiring photovoltaic inverter operation data sent by the Internet of things switch; the intelligent integration terminal responds to the scheduling instruction or locally calculates given values of grid-connected voltage, generated energy, active power, reactive power and power factor of each photovoltaic inverter, and issues the given values of the grid-connected voltage, the generated energy, the active power, the reactive power and the power factor of each photovoltaic inverter to the internet of things switch according to a communication mode of HPLC or RS 485;
step S4: the internet of things switch communication module collects the given value data packets of each photovoltaic inverter device sent by the intelligent fusion terminal, and then distributes the data packets to the corresponding photovoltaic inverters and the matched control devices thereof;
step S5: the photovoltaic inverter control device adjusts internal control parameters according to the obtained given values of grid-connected voltage, generated energy, active power, reactive power and power factor, and achieves the purpose of adjusting the grid-connected voltage, the generated energy, the active power, the reactive power and the power factor according to scheduling requirements.
Further, step S21 is replaced with step S22: the communication module of thing allies oneself with the switch passes through the agreement adaptation, fuses the terminal and forwards the main website and issue and call the survey communication instruction to the thing allies oneself with the switch, and the port information of request frame data field is received to the thing allies oneself with the switch, will gather the data package that is sent by the photovoltaic inverter device according to RS485 communication mode through the data relay mode, and the form packing data according to the response frame is copied and is uploaded to intelligent fusion terminal, does not carry out the analysis locally at the thing allies oneself with the switch.
The invention and the preferred scheme thereof have the following advantages or beneficial effects:
1. through the protocol adaptation of the internet of things switch, data relay is achieved, the purpose of transmitting different protocols through the high-speed power carrier High Performance Liquid Chromatography (HPLC) module is achieved, and the management capability of the internet of things switch on photovoltaic inverter devices of different manufacturers is given.
2. The intelligent integration terminal is provided with a safety encryption chip, the thing networking switch can be additionally provided with the safety encryption chip, the power information safety boundary of the photovoltaic grid connection is extended to the collection side of the thing networking switch, and the data safety of the photovoltaic power information is ensured from the equipment level.
3. The intelligent integration terminal and the internet of things switch are used for achieving grid-connected voltage, generated energy, active power, reactive power, power factor and other electric quantity acquisition, remote control and local protection of the distributed photovoltaic inverter, voltage stability of a low-voltage power distribution network is maintained, active power fluctuation is restrained, the purpose of adjusting given reactive power and a target power factor is achieved, and line loss is reduced.
4. The acquisition of one-point-to-multipoint inverter grid-connected information can be realized by utilizing one thing networking switch, and the construction cost and the later operation and maintenance cost for acquiring and protecting one photovoltaic inverter by one thing networking switch are reduced;
5. the photovoltaic inverter and the reactive compensation function of the matched control device of the photovoltaic inverter are fully utilized, a set of reactive compensation device does not need to be constructed in a matched mode, and the construction cost and the later-stage operation and maintenance cost are reduced.
Drawings
The invention is described in further detail below with reference to the following figures and detailed description:
fig. 1 is a schematic structural diagram of a first distributed photovoltaic inverter control system according to an embodiment of the present invention.
Fig. 2 is a schematic structural diagram of a second distributed photovoltaic inverter control system according to an embodiment of the present invention.
Fig. 3 is a schematic diagram of a control flow of the distributed photovoltaic inverter according to the embodiment of the present invention.
Fig. 4 is a schematic view of an overall structure of a photovoltaic inverter and a control device associated therewith according to an embodiment of the present invention.
Detailed Description
Hereinafter, specific embodiments of the present application will be described in detail with reference to the accompanying drawings, and it will be apparent to those skilled in the art from this detailed description that the present application can be practiced. Features from different embodiments may be combined to yield new embodiments, or certain features may be substituted for certain embodiments to yield yet further preferred embodiments, without departing from the principles of the present application.
In order to make the features and advantages of the present invention comprehensible, embodiments accompanied with figures are described in detail as follows:
as shown in fig. 1, the basic design scheme provided by this embodiment includes n photovoltaic inverters, an internet of things switch, and an intelligent convergence terminal.
Wherein each photovoltaic inverter is provided with: the inverter controller is provided with at least 2 RS485 interfaces; the thing allies oneself with the switch and has connected at least: the system comprises an RS485 communication module and an HPLC carrier communication module, wherein the RS485 communication module is provided with at least 2 RS485 interfaces; the n photovoltaic inverters and the internet of things switch are connected by a hand in an RS485 interface to form a looped network; the intelligent fusion terminal and the Internet of things switch are connected through HPLC carrier relay communication.
Specifically, the connection mode of the core part may be: the communication module of the internet of things switch is connected with the 1 st RS-485 interface of the photovoltaic inverter and the controller device 1 matched with the photovoltaic inverter, the second RS-485 interface of the photovoltaic inverter device 1 is connected with the first RS-485 interface of the photovoltaic inverter device 2, the second RS-485 interface of the photovoltaic inverter device 2 is connected with the first RS-485 interface of the photovoltaic inverter device 3, and the rest is done until the second RS-485 interface of the photovoltaic inverter device n is connected with the second RS-485 interface of the internet of things switch.
In this embodiment, the definition of the adopted internet of things switch is basically the same as the meaning of the existing "intelligent switch of internet of things" in the conventional field, that is, the switch-on and switch-off of the switch can be remotely controlled through the internet of things. When the method is specifically applied to the scenario of the embodiment, the "internet of things part" is realized by using an HPLC carrier communication module (which may also be replaced by an RS485 communication mode), and the module belongs to a common circuit module in the field, and further description thereof is omitted in the embodiment; the switch part can adopt a breaker commonly used in the field for controlling the on-off of the circuit and can be further provided with a control circuit for switching on and off.
Further, in order to realize on-off control of the photovoltaic inverter to the power grid, the power output end of the internet of things switch can be electrically connected with the 380V distribution network of the transformer area, and the power input end of the internet of things switch is electrically connected with the photovoltaic inverter, namely, a part of a circuit breaker of the photovoltaic inverter is connected.
Related modules such as control and communication are introduced, so that the method can be used for realizing island protection, overvoltage protection, undervoltage protection and electric quantity statistics, realizing remote control and remote measurement, uploading electric quantity data and quickly isolating the photovoltaic inverter in a fault state.
In this embodiment, the adopted intelligent fusion terminal also belongs to the current mature equipment, and can use the self-contained functions to respond to a scheduling instruction or locally calculate the grid-connected voltage, power generation, active power, reactive power and power factor set values of each photovoltaic inverter so as to meet the functions of the area of stable alternating voltage, the suppression of active power fluctuation, the unified compensation of reactive power and the centralized regulation of power factor, and to monitor the quality of the electric energy of the internet of things switch and the low-voltage distribution network and upload data to the distribution cloud master station. The intelligent fusion terminal can further perform data interaction with other equipment in a wireless public network mode.
In this embodiment, the intelligent integrated terminal embeds the security encryption chip, supports terminal self protection. Correspondingly, the thing allies oneself with the switch and can install safe encryption chip additional, extends thing allies oneself with switch data acquisition side with photovoltaic regulation and control data communication's safe boundary.
As shown in fig. 4, in the present embodiment, the circuit topology of the three-phase inverter includes, but is not limited to, a two-level topology, a three-level T-Type topology, a three-level flying capacitor Type topology, a three-level neutral point clamped topology, a multi-level cascaded topology, etc., and implements a dc inversion into a three-phase ac function and an active power, reactive power and power factor regulation function. The controller is used for controlling the photovoltaic inverter to generate voltage meeting the requirement of grid-connected access to the low-voltage power distribution network, collecting electrical quantity data of photovoltaic input voltage, input current, output voltage and output current, interacting photovoltaic inverter information with the internet of things switch in an RS-485 communication mode, and responding to a grid-connected regulation and control instruction issued by the internet of things switch in the RS-485 communication mode.
In the actual use process, the three-phase photovoltaic inverter can be merged into the voltage of the alternating-current power distribution network through the data acquisition deviceU a 、U b 、U c Current merging into an AC distribution networki al 、i bl 、i cl Photovoltaic direct voltage, photovoltaic direct currenti dc The current generated energy, the active power, the reactive power and the power factor are obtained through the matching calculation of the inverter control device and the data calculation deviceThe data transmission device transmits the data to the internet of things switch in an RS-485 mode, and transmits related display data to the display device, and data which do not need to be calculated, such as the voltage of a three-phase photovoltaic inverter merged into an alternating current distribution networkU a 、U b 、U c Current merging into an AC distribution networki al 、i bl 、i cl Photovoltaic direct voltage, photovoltaic direct currenti dc The data acquisition device directly sends the data to the display device, and the display device displays real-time photovoltaic inverter running state data. The data of each photovoltaic inverter is collected by the internet of things switch, the data packet content uploaded by each photovoltaic inverter is locally analyzed through the RS-485 communication module of the internet of things switch, whether the photovoltaic inverter running state data which do not meet the grid-connected requirement exist is judged, protection actions such as overload protection, overvoltage protection and undervoltage protection are carried out on the spot, the data are packaged into a data format which is adaptive to an HPLC communication mode, and the data are transmitted to the intelligent fusion terminal according to the HPLC communication mode.
The intelligent fusion terminal responds to the scheduling instruction or locally calculates the given values of grid-connected voltage, generated energy, active power, reactive power and power factor of each photovoltaic inverter so as to meet the functions of stabilizing alternating voltage, inhibiting active power fluctuation, uniformly compensating reactive power and centrally adjusting power factor in the region. The alternating current intelligent fusion terminal issues given values of grid-connected voltage, generated energy, active power, reactive power and power factor of each photovoltaic inverter to the Internet of things switch in a communication mode of HPLC, the Internet of things switch distributes the given values of the photovoltaic inverters to corresponding photovoltaic inverters and matched control devices thereof in an RS-485 communication mode, and the control devices adjust internal control parameters and driving signals according to the obtained given values of the grid-connected voltage, the generated energy, the active power, the reactive power and the power factor, so that the purpose of adjusting the grid-connected voltage, the generated energy, the active power, the reactive power and the power factor according to scheduling requirements is achieved.
As shown in fig. 2, the second distributed pv inverter control system structure provided in the embodiment of the present invention also supports a multi-internet-of-things switch topology structure in which each pv inverter is correspondingly connected to one internet-of-things switch, and this scheme is clearer in terms of control logic, but has a higher cost, and only a HPLC carrier communication mode can be supported between the internet-of-things switch and the intelligent convergence terminal.
As shown in fig. 3, the communication scheme provided by the embodiment of the present invention is:
and S1, when the photovoltaic inverter device is ready to be incorporated into a power distribution network for power generation, the photovoltaic inverter device collects photovoltaic input voltage, input current, output voltage and output current electrical quantity data, calculates and obtains current generated energy, active power, reactive power and power factor electrical quantity data, and packs the data and sends the data to the Internet of things switch in an RS-485 mode.
S21, collecting current photovoltaic operation data sent by a photovoltaic inverter device according to an RS-485 communication mode through a communication module of the Internet of things switch, locally analyzing a data packet, analyzing data information of current generated energy, active power, reactive power and power factor electrical quantity, judging whether local protection actions such as island protection, overload protection, overvoltage protection, undervoltage protection and the like need to be carried out or not, packaging the data packet according to an HPLC communication mode, and sending the data packet to an intelligent fusion terminal;
s22, the communication module of the internet of things switch is adapted through a protocol, the integration terminal forwards a calling communication instruction sent by the master station to the internet of things switch, the internet of things switch receives port information of a frame requesting data domain, a data packet collected by the photovoltaic inverter device and sent by the photovoltaic inverter device according to an RS-485 communication mode is packaged and transmitted to the intelligent integration terminal according to a format of a response frame, and the data packet is not locally analyzed in the internet of things switch.
And S3, after the intelligent fusion terminal collects the photovoltaic inverter operation data sent by the internet of things switch, uploading the data packet to a cloud master station. The intelligent integration terminal responds to the scheduling instruction or locally calculates given values of grid-connected voltage, generated energy, active power, reactive power and power factor of each photovoltaic inverter, and sends the given values of grid-connected voltage, generated energy, active power, reactive power and power factor of each photovoltaic inverter to the Internet of things switch according to a communication mode of HPLC or RS-485.
And S4, the Internet of things switch communication module collects the given value data packets of each photovoltaic inverter device sent by the intelligent fusion terminal, and then distributes the data packets to the corresponding photovoltaic inverter and the matched control device thereof.
And S5, adjusting internal control parameters by the control device according to the obtained given values of the grid-connected voltage, the generated energy, the active power, the reactive power and the power factor, and achieving the purpose of adjusting the grid-connected voltage, the generated energy, the active power, the reactive power and the power factor according to the scheduling requirement.
For the 2 nd step, if the topological structure shown in fig. 1 is adopted, the scheme of S21 is generally adopted, and the photovoltaic inverter device locally analyzes the acquired data packet corresponding to the first communication method, and repackages and uploads the data packet to the intelligent fusion terminal;
if the topological structure shown in fig. 2 is adopted, the scheme of S22 is generally adopted, the communication module corresponding to the second communication method is that the communication module of the internet of things switch is adapted through a protocol, the convergence terminal forwards a recall and test communication instruction issued by the master station to the internet of things switch, the internet of things switch receives port information of a request frame data domain, a data packet which is acquired and sent by the photovoltaic inverter device according to an RS-485 communication mode is transmitted through a data relay mode, data is packaged according to a format of a response frame and is copied and uploaded to the intelligent convergence terminal, and the analysis is not performed locally on the internet of things switch.
The present invention is not limited to the above-mentioned preferred embodiments, and various other types of distributed pv inverter control systems and methods can be derived by anyone in light of the present disclosure.
Claims (9)
1. A distributed photovoltaic inverter control system, comprising: the system comprises a plurality of photovoltaic inverters, an internet of things switch and an intelligent fusion terminal; and the photovoltaic inverters are connected with the intelligent fusion terminal through the internet of things switch respectively.
2. The distributed photovoltaic inverter control system of claim 1, wherein: each of the photovoltaic inverters is provided with: the inverter controller is provided with at least 2 RS485 interfaces; the thing allies oneself with the switch and has connected at least: the system comprises an RS485 communication module and an HPLC carrier communication module, wherein the RS485 communication module is provided with at least 2 RS485 interfaces; the photovoltaic inverters and the Internet of things switch are connected by hands through RS485 interfaces to form a looped network; and the intelligent fusion terminal is connected with the Internet of things switch through HPLC.
3. The distributed photovoltaic inverter control system of claim 1, wherein: and the power output end of the internet of things switch is electrically connected with a 380V distribution network of the transformer area, and the power input end of the internet of things switch is electrically connected with the photovoltaic inverter.
4. The distributed photovoltaic inverter control system of claim 2, wherein: the photovoltaic inverter is respectively connected with the inverter control device and the data acquisition device, and the inverter control device is respectively connected with the data acquisition device, the data calculation device and the data transmission device; the display device is respectively connected with the data acquisition device and the data transmission device.
5. The distributed photovoltaic inverter control system of claim 1, wherein: the intelligent fusion terminal is embedded with a safety encryption chip for supporting the self protection of the terminal; the thing allies oneself with the switch and is provided with safe encryption chip, extends thing allies oneself with switch data acquisition side with the safe boundary of photovoltaic regulation and control data communication.
6. The control method of the distributed photovoltaic inverter control system according to claim 4, characterized in that: the data acquisition device incorporates a three-phase photovoltaic inverter into the voltage of an AC distribution networkU a 、U b 、U c Current merging into an AC distribution networki al 、 i bl 、i cl Photovoltaic direct voltage, photovoltaic direct currenti dc The collection and give inverter control device, inverter control device and data calculating device cooperation are calculated and are obtained current generated energy, active power, reactive power and power factor electric capacity data, send for the thing through data transmission device and ally oneself with the switch to give display device with relevant display data transmission, to the data that needn't calculate, include: voltage of three-phase photovoltaic inverter incorporated in AC distribution networkU a 、U b 、U c Current merging into an AC distribution networki al 、i bl 、i cl Photovoltaic direct voltage, photovoltaic direct currenti dc The data acquisition device directly sends the data to the display device, and the display device displays real-time photovoltaic inverter running state data; the data of each photovoltaic inverter is collected by the internet of things switch, the data packet content uploaded by each photovoltaic inverter is locally analyzed through an RS485 communication module of the internet of things switch, whether photovoltaic inverter running state data which do not meet grid-connected requirements exist is judged, protection action is carried out on the spot, and the data packet is packaged into a data format which is adaptive to an HPLC communication mode and is transmitted to the intelligent fusion terminal.
7. The control method of the distributed photovoltaic inverter control system according to claim 6, characterized in that: the intelligent fusion terminal responds to a scheduling instruction or locally calculates given values of grid-connected voltage, generated energy, active power, reactive power and power factor of each photovoltaic inverter so as to meet the functions of stabilization of alternating voltage, suppression of active power fluctuation, unified compensation of reactive power and centralized regulation of power factor in the region; the intelligent integration terminal issues given values of grid-connected voltage, generated energy, active power, reactive power and power factor of each photovoltaic inverter to the Internet of things switch in a communication mode of HPLC, the Internet of things switch distributes the given values of the photovoltaic inverters to corresponding photovoltaic inverters and matched control devices thereof, and the inverter control devices adjust internal control parameters and driving signals according to the obtained given values of the grid-connected voltage, the generated energy, the active power, the reactive power and the power factor, so that the purpose of adjusting the grid-connected voltage, the generated energy, the active power, the reactive power and the power factor according to scheduling requirements is achieved.
8. The data communication method of the distributed photovoltaic inverter control system according to claim 1, characterized by comprising the steps of:
step S1: when the photovoltaic inverter device is ready to be merged into a power distribution network for power generation, the photovoltaic inverter device collects photovoltaic input voltage, input current, output voltage and output current electrical quantity data, calculates and obtains current generated energy, active power, reactive power and power factor electrical quantity data, and packs the data and sends the data to an internet of things switch according to an RS485 mode;
step S21: the current photovoltaic operation data that is sent by photovoltaic inverter device according to RS485 communication mode is gathered to the communication module of thing allies oneself with the switch, at local analytic data package, and current generated energy, active power, reactive power and the electric volume data message of power factor are analyzed, judge whether need carry out the protection action on the spot, include: island protection, overload protection, overvoltage protection and undervoltage protection; packing the data packet according to an HPLC communication mode and sending the data packet to an intelligent fusion terminal;
step S3: the intelligent integration terminal uploads a data packet to a cloud master station after acquiring photovoltaic inverter operation data sent by the Internet of things switch; the intelligent integration terminal responds to the scheduling instruction or locally calculates given values of grid-connected voltage, generated energy, active power, reactive power and power factor of each photovoltaic inverter, and issues the given values of the grid-connected voltage, the generated energy, the active power, the reactive power and the power factor of each photovoltaic inverter to the internet of things switch according to a communication mode of HPLC or RS 485;
step S4: the internet of things switch communication module collects the given value data packets of each photovoltaic inverter device sent by the intelligent fusion terminal, and then distributes the data packets to the corresponding photovoltaic inverters and the matched control devices thereof;
step S5: the photovoltaic inverter control device adjusts internal control parameters according to the obtained given values of grid-connected voltage, generated energy, active power, reactive power and power factor, and achieves the purpose of adjusting the grid-connected voltage, the generated energy, the active power, the reactive power and the power factor according to scheduling requirements.
9. The data communication method of the distributed photovoltaic inverter control system according to claim 8, wherein the step S21 is replaced with the step S22: the communication module of thing allies oneself with the switch passes through the agreement adaptation, fuses the terminal and forwards the main website and issue and call the survey communication instruction to the thing allies oneself with the switch, and the port information of request frame data field is received to the thing allies oneself with the switch, will gather the data package that is sent by the photovoltaic inverter device according to RS485 communication mode through the data relay mode, and the form packing data according to the response frame is copied and is uploaded to intelligent fusion terminal, does not carry out the analysis locally at the thing allies oneself with the switch.
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