CN213367423U - Three-phase 5KW micro-grid - Google Patents
Three-phase 5KW micro-grid Download PDFInfo
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- CN213367423U CN213367423U CN202022530539.1U CN202022530539U CN213367423U CN 213367423 U CN213367423 U CN 213367423U CN 202022530539 U CN202022530539 U CN 202022530539U CN 213367423 U CN213367423 U CN 213367423U
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E40/00—Technologies for an efficient electrical power generation, transmission or distribution
- Y02E40/30—Reactive power compensation
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E40/00—Technologies for an efficient electrical power generation, transmission or distribution
- Y02E40/50—Arrangements for eliminating or reducing asymmetry in polyphase networks
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P80/00—Climate change mitigation technologies for sector-wide applications
- Y02P80/20—Climate change mitigation technologies for sector-wide applications using renewable energy
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Abstract
The utility model discloses a three-phase 5KW microgrid, this microgrid is by three-phase switching control mainboard, current transformer, four miniature single-phase photovoltaic grid-connected inverter and the communication centralized control ware dress of apolegamy connect and constitute, wherein three miniature single-phase photovoltaic grid-connected inverter inserts arbitrary one-phase line and is incorporated into the power networks along separate routes, remaining miniature single-phase photovoltaic grid-connected inverter inserts the controlled switching of three-phase switching control mainboard and one of them line compensation and is incorporated into the power networks, and the load current of gathering each phase line by current transformer is used for the three-phase switching control mainboard to judge the maximum load looks from this, and as the basis that triggers of compensation switching control that is incorporated into the. And the communication centralized controller is utilized to externally transmit information data for monitoring and managing the running state of the micro-grid system. By applying the micro-grid terminal, the requirement of industrial application on energy supply strength is guaranteed; meanwhile, the photovoltaic energy supply to the maximum load phase line can be increased in a self-adaptive mode, and the three-phase power grid balance is facilitated.
Description
Technical Field
The utility model relates to a be applied to and insert three-phase electric wire netting and be incorporated into power networks system of ally oneself with usefulness, especially relate to a three-phase 5KW microgrid.
Background
Three-phase alternating current is a form of delivery of electrical energy, referred to as three-phase power for short. The three-phase ac power supply is composed of three ac potentials with same frequency, same amplitude and phase difference of 120 deg. in turn.
Three-phase ac power is used in many applications, and most ac electric devices in industry, such as motors, use three-phase ac power. In daily life, a single-phase power supply, also called a lighting power supply, is often used. When the lighting power supply is used, one of the three phases of power is used to power the electrical equipment, such as a household appliance, and the other line is the fourth line in the three-phase four-wire system, i.e., the zero line, which is led out from the neutral point of the three phases of power.
However, grid balance is affected to some extent by the variability of the load in each phase line in three-phase ac applications. With the application of new photovoltaic energy becoming mature, in more and more industrial equipment applications, a microgrid with a certain power design needs to be connected into a three-phase mains supply for grid-connected use, so that the proportion of green energy in energy consumption utilization is optimized.
Disclosure of Invention
The utility model aims at providing a three-phase 5KW microgrid to satisfy photovoltaic power generation feedback three-phase electric wire netting, and the adjustment electric wire netting is balanced.
The utility model provides a technical solution who realizes above-mentioned purpose is, a three-phase 5KW microgrid, its characterized in that includes: the three-phase switching control main board is provided with an MCU (microprogrammed control Unit), sampling signal interfaces corresponding to the three-phase lines and signal access ends corresponding to the miniature single-phase photovoltaic grid-connected inverters, and is connected to the output ends LA, LB and LC of the three-phase lines; the current transformer is independently arranged in each phase circuit to collect load current and is butted with the sampling signal interface; the four miniature single-phase photovoltaic grid-connected inverters are in butt joint with the signal access end through parameter circuits, three miniature single-phase photovoltaic grid-connected inverters are connected into each phase circuit, and the fourth miniature single-phase photovoltaic grid-connected inverter is connected into the switching input end of the three-phase switching control main board.
Preferably, in the three-phase 5KW microgrid, the three-phase switching control motherboard is preset with a control program corresponding to switching output of each phase of line, wherein a trigger point of the switching output is set to be a correlation between a maximum load phase line obtained by comparing load current of each phase of line and a current one-phase line switched and input by the fourth miniature single-phase photovoltaic grid-connected inverter, when the two phases of lines are consistent, the switching is stopped, and when the two phases of lines are different, the switching is switched to the maximum load phase line.
Preferably, each of the three-phase 5KW microgrid having a plurality of photovoltaic modules is connected to at least two photovoltaic modules, and each photovoltaic module is an aggregate of 60 or 72 photovoltaic modules.
Above-mentioned three-phase 5KW microgrid, further preferred, each miniature single-phase photovoltaic grid-connected inverter is connected with four photovoltaic module.
Above-mentioned 5KW microgrid of three-phase, preferred, still include a communication centralized control ware, three-phase switching control mainboard is connected through the 485 bus with the communication centralized control ware, and the communication centralized control ware is connected and mutual information data with user's host computer or mobile terminal.
Use the utility model discloses a little electric wire netting possesses following progressive: on one hand, the micro-grid is connected to the three-phase commercial power, and the photovoltaic modules connected in a large scale can be used for generating feedback to compensate the power loss of the three-phase commercial power, so that the requirement of industrial application on energy supply intensity is guaranteed; on the other hand, the photovoltaic energy supply to the maximum load phase line can be adaptively increased through the load judgment of the three-phase line, and the three-phase power grid balance is facilitated.
Drawings
Fig. 1 is the circuit architecture schematic diagram of the three-phase 5KW microgrid of the present invention.
Fig. 2 is a pin diagram of a three-phase switching control main board in the micro grid shown in fig. 1.
Detailed Description
The following detailed description is made of specific embodiments of the present invention with reference to the accompanying drawings, so as to make the technical solution of the present invention easier to understand and grasp, and thus make a clearer definition of the protection scope of the present invention.
In view of the energy-conserving requirement of three-phase electric wire netting in industrial production application and reply the undulant performance of load promote gradually, the utility model discloses the designer responds market demand, combines relevant field practitioner experience accumulation to develop research and development, and the innovation provides a three-phase 5KW little electric wire netting equipment to satisfy photovoltaic power generation and supply three-phase electric wire netting, and according to load change and self-adaptation ground adjustment electric wire netting balance.
The following description is made with reference to fig. 1 and 2, and the structural overview of the three-phase 5KW microgrid according to the present invention is first described. As a single micro-grid device, the micro-grid device is provided with a shell as a hardware carrier and inner and outer box interface terminals for externally butting photovoltaic modules or connecting three-phase mains supply, and as a part of a micro-grid core component, the micro-grid device is fixedly arranged in the shell in a region or space stacking mode, and the shell is optimally configured with corresponding functions of heat dissipation, dust prevention, moisture prevention and the like. Particularly, the micro-grid at least comprises a three-phase switching control main board 1, three current transformers 2 and four micro single-phase photovoltaic grid-connected inverters 3. The three-phase switching control main board is provided with an MCU (microprogrammed control Unit), output ends LA, LB and LC connected into three-phase lines, sampling signal interfaces (not shown) corresponding to the three-phase lines and signal access ends corresponding to the miniature single-phase photovoltaic grid-connected inverters. The part is a main control part for the operation of the whole micro-grid, is used for processing and integrating received and output information data and is mainly used for controlling the balance of the three-phase power grid. The current transformer is independently arranged in each phase circuit to collect load current and is butted with the sampling signal interface; the method is mainly used for feeding back the load current so that the three-phase switching control main board can judge the maximum load phase line, and the minimum load current is the maximum load phase under normal conditions. As a main energy source of the micro-grid, four micro single-phase photovoltaic grid-connected inverters are butted with a signal access end through parameter circuits, and therefore interactive operation states, performance parameters and the like of the main board are controlled in a three-phase switching mode. However, these micro single-phase photovoltaic grid-connected inverters are used by grouping, and more specifically, three micro single-phase photovoltaic grid-connected inverters are connected to each one-phase line, that is, any one phase of the three-phase commercial power is fully supplemented by one micro single-phase photovoltaic grid-connected inverter without additional control. And the rest fourth miniature single-phase photovoltaic grid-connected inverter is connected to the switching input end of the three-phase switching control main board, and is selectively connected to the grid by the three-phase switching control main board to supplement the grid to a phase line with a higher load.
The three-phase switching control main board 1 is preset with a control program corresponding to each phase line switching output, wherein a trigger point of the switching output is set as the relevance between the maximum load phase line obtained by comparing the load current of each phase line and a current phase line switched and input by the fourth micro single-phase photovoltaic grid-connected inverter. To more intuitively understand the function implementation based on the micro-grid architecture, the load currents obtained by the current transformers corresponding to each phase are IA, IB and IC. As can be seen from the pin diagram of the three-phase switching control motherboard shown in fig. 2, a sampling circuit is provided corresponding to the load current signal and fed back to the MCU, and the MCU compares the load current signal with the minimum load current IB to obtain a phase with the maximum load phase. Because the miniature single-phase photovoltaic grid-connected inverter P, Q, R is connected with the uncontrollable and balanced properties of the supplementary three-phase mains supply, the energy supply of the B-phase line is relatively tight. And on the basis of judging to obtain the maximum load phase line, the three-phase switching control main board controls to open grid-connected supplement facing the B-phase line through the relay. As the application time is continuously accumulated, as long as the load current of the B-phase line is kept minimum, the grid-connected supplementation facing the B-phase line is continuously kept; once the load current of the A-phase line or the C-phase line is reduced and is smaller than that of the B-phase line, the three-phase switching control main board turns off the grid-connected supplement facing the B-phase line through the relay control and simultaneously turns on the grid-connected supplement facing the corresponding maximum load phase line.
Indeed, the above-mentioned miniature single-phase photovoltaic grid-connected inverter is not a direct energy source, but an inverter capable of converting a variable dc voltage generated by a photovoltaic module into a commercial power frequency ac, for example, the selectable models are: SMT-I1.25KW-CN, SMT-I1.25KW-SAA. In the micro-grid, each micro single-phase photovoltaic grid-connected inverter comprises four inputs which are respectively connected with four photovoltaic modules. The photovoltaic component is an aggregate of 60 or 72 photovoltaic components, the micro inverter is used for tracking and extracting the maximum power point of each component of the four photovoltaic components, meanwhile, the output power of each photovoltaic component is coordinated and distributed according to the extracted maximum power to form a multilevel mode, then the extracted four maximum powers are gathered, the gathered voltage is boosted, the boosted voltage is sequentially rectified, filtered and subjected to phase change to obtain the current and the voltage meeting the voltage requirement of a power grid, and the energy is input to the power grid. Therefore, the inversion efficiency of the miniature single-phase photovoltaic grid-connected inverter is up to more than 95%, and the output efficiency of the photovoltaic panel can be maximized. Compared with the traditional centralized string-type inverter, the inverter has the advantages of high inversion efficiency, no end plate effect, low-voltage starting, good low-light performance and the like.
In addition, in the whole micro-grid system, the operating states and parameters of the four miniature single-phase photovoltaic grid-connected inverters can be transmitted to the signal access end of the three-phase switching control main board in an RS485 communication mode, and the three-phase switching control main board integrates communication data and transmits the communication data to the communication centralized controller through a 485 bus. And finally, transmitting the information data of the communication centralized controller to a user upper monitoring host according to a user-defined communication protocol (such as a standard modbus protocol) so as to facilitate the user to monitor and manage the running state of the whole micro-grid system in real time.
If the user does not have the host monitoring host computer, the communication centralized controller can be accessed to a wireless local area network or a cellular network, and a monitoring scheme meeting the requirements of the customer is provided through a WiFi or GPRS communication mode. A user can log in a monitoring system website through a given user account at a mobile terminal, and the running condition of the whole system can be checked in real time.
The operation control method of the three-phase 5KW microgrid is understood, and the microgrid collects load current by using a current transformer independently arranged in each phase circuit and feeds signals back to a three-phase switching control main board; a miniature single-phase photovoltaic grid-connected inverter is configured corresponding to each phase line to be connected with a grid, and a fourth miniature single-phase photovoltaic grid-connected inverter is configured to be connected into the three-phase switching control main board; and a sampling signal interface of the three-phase switching control main board is used for receiving the load current collected by the current transformer, the output ends LA, LB and LC of the three-phase switching control main board are connected into a three-phase circuit, the MCU of the three-phase switching control main board is used for processing and judging the maximum load phase, and the switching control of the on-off of the fourth minitype single-phase photovoltaic grid-connected inverter facing each output end is realized.
The three-phase switching control main board compares the load current of each phase line to obtain a maximum load phase line, sets a trigger point of switching output as the relevance of the maximum load phase line and a current phase line of switching input of a fourth miniature single-phase photovoltaic grid-connected inverter, keeps grid connection when the maximum load phase is the current phase line of switching input, and switches the fourth miniature single-phase photovoltaic grid-connected inverter into the maximum load phase line when the maximum load phase is not the current phase line of switching input.
Of course this little electric wire netting's power size is according to the self-defined setting of application environment, through adjusting inverter specification parameter or increase and decrease photovoltaic module access number realization, not the utility model discloses the key of claim protection, the event omits the example detail.
To sum up to the embodiment details that the utility model discloses three-phase 5KW microgrid combines the figure, can fully understand its progressive nature that brings: on one hand, the utility model can utilize the photovoltaic module which is accessed in large scale to generate electricity and feed back to compensate the power loss of the three-phase commercial power by accessing the micro-grid into the three-phase commercial power, thereby ensuring the requirement of industrial application on energy supply intensity; on the other hand, the photovoltaic energy supply to the maximum load phase line can be adaptively increased through the load judgment of the three-phase line, and the three-phase power grid balance is facilitated.
In addition to the above embodiments, the present invention may have other embodiments, and all technical solutions formed by equivalent replacement or equivalent transformation fall within the scope of the present invention.
Claims (5)
1. A three-phase 5KW microgrid is characterized by comprising:
the three-phase switching control main board is provided with an MCU (microprogrammed control Unit), sampling signal interfaces corresponding to the three-phase lines and signal access ends corresponding to the miniature single-phase photovoltaic grid-connected inverters, and is connected to the output ends LA, LB and LC of the three-phase lines;
the current transformer is independently arranged in each phase circuit to collect load current and is butted with the sampling signal interface;
the four miniature single-phase photovoltaic grid-connected inverters are in butt joint with the signal access end through parameter circuits, three miniature single-phase photovoltaic grid-connected inverters are connected into each phase circuit, and the fourth miniature single-phase photovoltaic grid-connected inverter is connected into the switching input end of the three-phase switching control main board.
2. The three-phase 5KW microgrid of claim 1, characterized in that: the three-phase switching control main board is preset with a control program corresponding to each phase line switching output, wherein a trigger point of the switching output is set as the relevance of a maximum load phase line obtained by comparing load current of each phase line and a current phase line switched and input by the fourth miniature single-phase photovoltaic grid-connected inverter, switching is stopped when the two phase lines are consistent, and switching is performed to the maximum load phase line when the two phase lines are different.
3. The three-phase 5KW microgrid of claim 1, characterized in that: each miniature single-phase photovoltaic grid-connected inverter is connected with more than two photovoltaic modules, and the photovoltaic modules are an aggregate of 60 or 72.
4. The three-phase 5KW microgrid of claim 3, characterized in that: and each miniature single-phase photovoltaic grid-connected inverter is connected with four photovoltaic modules.
5. The three-phase 5KW microgrid of claim 1, further comprising a communication centralized controller, wherein the three-phase switching control main board is connected with the communication centralized controller through a 485 bus, and the communication centralized controller is connected with a user upper monitoring host or a mobile terminal and interacts information data.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
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| CN202022530539.1U CN213367423U (en) | 2020-11-05 | 2020-11-05 | Three-phase 5KW micro-grid |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202022530539.1U CN213367423U (en) | 2020-11-05 | 2020-11-05 | Three-phase 5KW micro-grid |
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| CN213367423U true CN213367423U (en) | 2021-06-04 |
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| CN202022530539.1U Active CN213367423U (en) | 2020-11-05 | 2020-11-05 | Three-phase 5KW micro-grid |
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