CN112086957A - High-quality electric energy intelligent distribution system structure of alternating current-direct current hybrid park network based on Internet of things - Google Patents

Abstract

The invention discloses a high-quality electric energy intelligent distribution system structure of an AC-DC hybrid park network based on the Internet of Things, which can improve the current uncontrollable electric energy flow in the park and provide high-quality electric power. With the high-quality power intelligent distribution device as the core, based on the ubiquitous perception of the park AC-DC hybrid network topology, it can not only provide standardized interfaces of various voltage levels and power forms, but also control the voltage and current of each port in real time to realize power Real-time intelligent allocation of demand. In addition, this structure can solve the power quality problem generated by new energy generation and load in the park, and stabilize the voltage of the AC bus and the user side. After the promotion of this structure, the acceptance level of distributed energy in the park and the power supply quality of the park can be improved, and the load adaptability of the park and the economy of park management can be improved.

Description

An intelligent distribution system for high-quality electric energy based on the Internet of Things in AC-DC hybrid park network traditional structure

technical field

The invention belongs to the fields of low-voltage power distribution network, micro-grid, Internet of Things and AC/DC hybrid, and particularly relates to a high-quality electric energy intelligent distribution system structure of an AC/DC hybrid park network based on the Internet of Things.

Background technique

With the development of new energy technologies and the demand for smart parks, a large number of distributed renewable energy sources, as well as energy storage, electric vehicles and controllable loads have been connected to the parks. Due to the intermittent, random and uncontrollable characteristics of these distributed energy generation, the grid structure and power flow are gradually changing; the fluctuation characteristics of energy storage, electric vehicles and controllable loads also contribute to the economic operation and management of the park network. brought challenges. The energy control device based on power electronic conversion technology can not only provide the required power interface for the distributed power supply, energy storage equipment, charging pile and controllable load in the AC/DC hybrid network system, but also reasonably distribute the energy of each node in the system flow and provide quality power. Therefore, it has important theoretical and practical significance to study the structure of high-quality power intelligent distribution system suitable for AC/DC hybrid campus network. According to the characteristics of new energy and load characteristics of the park, how to improve the rational distribution and utilization efficiency of new energy, reduce the impact of new energy fluctuations on the power quality of the park's AC-DC hybrid network, and improve the economic benefits of park management are the main goals of technicians.

SUMMARY OF THE INVENTION

The purpose of the present invention is to overcome the deficiencies of the prior art, provide a high-quality electric energy distribution system structure based on the AC/DC hybrid park network based on the Internet of Things, and realize the ubiquity, information panorama and intelligent control of the AC/DC hybrid network system in the park, Improve the energy efficiency of the park and provide high-quality electricity for the park.

A technical solution to achieve the above purpose is: an AC/DC hybrid park network high-quality power intelligent distribution system structure based on the Internet of Things, including an AC microgrid, a DC microgrid, a high-quality power intelligent distribution device, and a park ubiquitous perception IoT network. systems and distribution networks. The AC microgrid and the DC microgrid are connected with the high-quality power intelligent distribution device to form a park AC/DC hybrid network, and the park AC/DC hybrid network is connected to the low-voltage side of the distribution network; each unit controller in the microgrid is connected to the sensing concentrator, The sensing concentrator is connected to the autonomous terminal of the park, and the autonomous terminal of the park is connected to the energy management platform of the park to form the ubiquitous sensing Internet of things in the park, and the ubiquitous sensing Internet of things in the park is connected with the edge of the distribution network. The ubiquitous sensing Internet of Things together constitute the high-quality power intelligent distribution system of the AC-DC hybrid campus network based on the Internet of Things.

The microgrid includes energy storage units, distributed power supply units, charging pile units, AC load units, and AC and DC common interfaces to meet the access of AC and DC distributed generation, energy storage, loads and their power branches.

The high-quality power intelligent distribution device functionally includes an AC interface, a DC interface, a high-quality power compensation interface and an expansion interface. The AC interface is connected to the low-voltage AC bus in the distribution station area; the DC interface is connected to the DC bus of the park; the power quality interface is connected to the AC bus of the AC-DC hybrid network in the park; the expansion interface is used for other distributed power generation, energy storage and controllable loads interface extension.

The high-quality power intelligent distribution device specifically includes a bidirectional rectification link, a DC isolation link, a two-way inverter link, a power quality management transformation link, and a multi-port DC transformation link. The bidirectional rectification link and the bidirectional inverter link are respectively connected to the AC bus of the campus network to realize energy conversion between AC lines in the campus network; the DC isolation link is used to realize isolated bidirectional DC/DC conversion and voltage conversion; expand the multi-port DC The transformation link is used to provide low-voltage DC interfaces of different voltage levels; the power quality transformation link is connected to the AC busbar of the park network, which is used to flexibly deal with and deal with the power quality problems caused by random fluctuations of power generation equipment and loads in the AC line of the park, and improve the low-voltage busbar of the park. on the voltage and frequency stability capability.

The ubiquitous sensing IoT network system includes each unit controller in the microgrid, sensing concentrator, park autonomous terminal, edge IoT gateway and park energy management platform.

The present invention provides a high-quality electric power intelligent distribution system structure of an AC-DC hybrid park network based on the Internet of Things, which can improve the current uncontrollable energy flow of the power grid in the park. It can provide standardized interfaces of various power forms, and can also control the voltage and current of each port in real time, so as to realize the intelligent demand of park energy such as power flow scheduling, power quality control and energy management. Real-time collection provides big data support for the operation of the distribution network. After the promotion of this structure, the acceptance level of high and new energy in the park can be improved, and the economic and environmental benefits of park management can be improved.

Description of drawings

1 is a schematic structural diagram of a high-quality electric energy intelligent distribution system based on the Internet of Things in an AC-DC hybrid park network of the present invention;

2 is a schematic structural diagram of a high-quality electric energy intelligent distribution device based on the structure of a high-quality electric energy intelligent distribution system structure of an AC-DC hybrid park network based on the Internet of Things of the present invention;

FIG. 3 is a schematic diagram of the ubiquitous perception IoT network structure of an AC/DC hybrid campus network high-quality electric energy intelligent distribution system structure based on the IoT according to the present invention.

Detailed ways

In order to better understand the technical solutions of the present invention, a detailed description is given below through specific embodiments and in conjunction with the accompanying drawings:

Please refer to Fig. 1, an IoT-based AC/DC hybrid campus network high-quality power intelligent distribution system structure, including a park AC/DC hybrid network 1, a high-quality power intelligent distribution device 10, a ubiquitous sensing IoT network 2 and a power distribution network 4 .

The park AC/DC hybrid network 1 includes AC microgrids 11 and 12 and a DC microgrid 13 . The AC microgrids 11, 12 and the DC microgrid 13 are not only energy loads, but also important energy supply sources for the park, including wind power generation, photovoltaic power generation, energy storage, and charging piles.

Any microgrid is connected and combined with the high-quality power intelligent distribution device 10 to form a park AC/DC hybrid network 1, which supports the flow of power in the park; each unit controller of the AC microgrid 11 is connected to the sensing concentrator 22, and each unit of the AC microgrid 12 controls The sensor is connected to the sensing concentrator 24, each unit controller of the DC microgrid 13 is connected to the sensing concentrator 23, and the sensing concentrators 22 and 23 are connected to the park autonomous terminal 21; The information of the distribution device control unit 101 and the edge IoT gateway 40 is connected to the campus energy management platform 20; the campus autonomous terminal 25 receives the information from the perception concentrator 24, the high-quality power intelligent distribution device control unit 101 and the edge IoT gateway 41 and the campus The energy management platform 20 is connected; all together form the IoT network system 2 to realize the ubiquitous perception of the park AC/DC hybrid network 1; the park AC/DC hybrid network 1 and the ubiquitous perception IoT network system 2 together form an IoT-based The high-quality power intelligent distribution system 3 of the AC-DC hybrid park network realizes the full consumption and intelligent distribution of electric energy in the park, and realizes the coordinated management of high-quality power supply in the park; the system 3 is connected to the distribution network 4.

Please refer to Figure 2. The high-quality power intelligent distribution device can monitor the data in real time according to the energy flow and power quality in the park, and adapt to the input, output, conversion, and storage of different energy carriers, so that the power in the park is of the highest quality. The high-quality power intelligent distribution device includes bidirectional AC/DC converters 51 and 52 , a bidirectional DC converter 53 , a power quality converter 54 and an extended bidirectional DC converter 55 . The AC side of the bidirectional AC/DC converter 51 is connected to the AC bus of the park, the DC side of the bidirectional AC/DC converter 51 is connected to the bidirectional DC converter 53; the AC side of the bidirectional AC/DC converter 52 is connected to the AC bus of the park, and the bidirectional AC conversion The DC side of the power quality converter 52 is connected to the bidirectional DC converter 53; the DC side of the power quality converter 54 is connected to the bidirectional DC converter 53, and the AC side of the power quality converter 54 is connected to the AC microgrids 11 and 12; One end of the converter 55 is connected to the bidirectional DC converter 53, and the other end is used as a reserved port.

In the specific application, based on the law of economic operation of the station area, when the energy supply of the distributed energy sources in the AC microgrid 11 or 12 in the park exceeds the load power, under the condition of ensuring the optimal operation of the electric energy and the reasonable flow, the electric energy is controlled to The AC microgrid 11, 12 and the DC current microgrid 13 flow, so that the proper amount of electric energy flows to the proper load and reduces the electric energy sent back to the distribution network; when the controller 101 of the high-quality electric energy intelligent distribution device 10 detects the AC microgrid When the power quality in the network 11 or 12 is unqualified, according to the detected data, the reactive power is compensated to stabilize the voltage of the park, the harmonics are eliminated, and the real-time adjustment ensures the safety of the power flow.

Referring to Figure 3, in the campus ubiquitous sensing IoT network system 2, the AC microgrid controllers 221, 222, 223, and 224 are connected to the sensing concentrator 22, and the DC microgrid controller signals 231, 232, 233, and 234 are connected to the sensing The concentrator 23 is connected, the sensing concentrators 22 and 23 are connected to the park autonomous terminal 21 , the high-quality power intelligent distribution device controller 101 and the edge IoT gateway 40 are connected to the park energy management platform 20 through the park autonomous terminal 21 .

In a specific application, in the AC microgrid 11, the controller 221 monitors the distributed power source, the controller 222 monitors the energy storage unit, the controller 223 monitors the charging pile unit, the controller 224 monitors the load unit, and each monitor controls each unit in the microgrid During normal operation, the relevant electrical quantity and state quantity information are uploaded to the sensing concentrator 22, and the sensing concentrator 22 collects data, eliminates invalid/abnormal data, handles simple real-time responses, and supports data integration and local decision-making in the park. The communication methods integrated by the perception concentrator 22 include Bluetooth, WIFI wireless, 3G/4G/5G and ZigBee, etc., to complete the real-time data interaction of the communication micro-units. In the DC microgrid sensing network composed of the monitors 231, 232, 233, 234 and the sensing concentrator 23, the information transmission process and function realization are the same as those of the AC microgrid sensing network.

In specific applications, for the autonomous terminal 21 in the park, through real-time interaction with the Internet of Things gateway 40 at the edge of the distribution network, the incoming line status of the station area, through the collection of the outgoing line from the monitoring station area, that is, the incoming line data in the park, coupled with Perception of the data exchanged by the concentrators 22 and 23, combined with the topology of the AC and DC network in the park, to realize the statistics of the input/output power, line loss and line loss rate of each node, and to issue an abnormal alarm for abnormal operation fluctuations of the park network; The autonomous terminal 21 in the park can monitor the flow status of electric energy in the park in real time by interacting with the controller 101 of the high-quality electric power intelligent distribution device, and upload it to the park energy management platform for visual display.

In specific applications, the functions of the park energy management platform 20 include real-time monitoring of power consumption information in the park, and provide intelligent energy-saving services such as feedback control, energy optimization, and decision support, which can lay the foundation for intelligent interaction with the park's AC/DC hybrid network.

In a specific application, the edge agent terminal 40 exchanges information with the park energy autonomous terminal 21, and the edge agent terminal 41 exchanges information with the park energy autonomous terminal 25, thereby realizing the intelligent control of electric energy flow between the park and the distribution network.

Through the above solution of the present invention, the power generation of distributed energy sources is large during the day. By monitoring the electrical energy of the AC microgrids 11, 12 and the DC microgrid 13, the signs of the flow of electrical energy can be known, and the high-quality energy distributor 10 can be used to control the AC and DC of the park. The flow of energy in the hybrid network is reduced to the electric energy sent to the distribution network 4; through the intelligent monitoring of the data of the power quality in the AC-DC hybrid network 1 of the park, according to the disturbance characteristics of the power quality, the low voltage, harmonic and temporary The sensor concentrators 22, 23 and 24 can adapt to the differences in the communication modes of each control unit in the microgrid by integrating Bluetooth, WIFI wireless, 3G/4G/5G and ZigBee, etc.; Interacting with the sensing concentrators 22 and 24 and the high-quality power intelligent distribution device 10, an alarm will be issued in time when there is a change in the power grid and corresponding measures will be taken to ensure the security of the power grid. The system of the invention not only has reasonable structure design and simple implementation, but also has ubiquitous perception, intelligent control, high-quality power supply and sufficient energy utilization, and can be widely used.

The above embodiments are only used to illustrate the present invention, but not to limit the present invention. Any modification, equivalent replacement, improvement, etc. made to the above-described embodiments within the spirit and scope of the present invention will be fall within the protection scope of the present invention.

Claims (4)

1. A high-quality electric power intelligent distribution system structure of an AC-DC hybrid park network based on the Internet of Things, including an AC microgrid, a DC microgrid, a high-quality power intelligent distribution device, a park ubiquitous sensing IOT network system and a power distribution network. in: The AC microgrid and the DC microgrid are connected with the high-quality power intelligent distribution device to form a park AC/DC hybrid network, and the park AC/DC hybrid network is connected to the low-voltage side of the distribution network; each unit controller in the microgrid is connected to the sensing concentrator. The sensing concentrator is connected to the autonomous terminal of the park, and the autonomous terminal of the park is connected to the energy management platform of the park to form the ubiquitous sensing Internet of things in the park. 2. A high-quality electric energy intelligent distribution system structure based on the Internet of Things based on the AC-DC hybrid park network according to claim 1, characterized in that the microgrid comprises an energy storage unit, a distributed power supply unit, a charging pile unit, an AC load unit and AC/DC branch, to meet the access of AC/DC distributed generation, energy storage, load and its power branch. 3. The structure of a high-quality power intelligent distribution system based on the Internet of Things in an AC-DC hybrid park network according to claim 1, wherein the high-quality power intelligent distribution device functionally includes an AC interface, a DC interface, a power quality interface and an extension interface; the AC interface is connected to the low-voltage AC bus in the distribution station area; the DC interface is connected to the DC bus of the park; the power quality interface is connected to the AC bus of the park's AC-DC hybrid network, and the expansion interface is reserved for standby; Wherein, the high-quality power intelligent distribution device includes a bidirectional rectification link, a DC isolation link, a bidirectional inverter link, a power quality control conversion link, and a multi-port DC conversion link; the bidirectional rectification link and the bidirectional inverter link communicate with the park network respectively. The busbar connection is used to realize energy conversion between AC lines in the campus network; the DC isolation link is used to realize isolated bidirectional DC/DC conversion and voltage conversion; the extended multi-port DC conversion link is used to provide low-voltage AC-DC interfaces of different voltage levels The power quality transformation link is connected to the AC bus of the park network, which is used to flexibly deal with and deal with the power quality problems caused by random fluctuations of power generation equipment and loads in the AC line of the park, and improve the voltage and frequency stability of the low-voltage bus in the park. 4. The structure of a high-quality power intelligent distribution system based on the Internet of Things in an AC-DC hybrid park network according to claim 1, characterized in that the ubiquitous sensing Internet of Things network system comprises each unit controller and a sensing concentrator in the microgrid , Park Autonomous Terminal, Edge IoT Gateway and Park Energy Management Platform.

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