CN112615381A - Device is administered to terminal low voltage of distributing type low voltage distribution network - Google Patents
Device is administered to terminal low voltage of distributing type low voltage distribution network Download PDFInfo
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- CN112615381A CN112615381A CN202011452634.2A CN202011452634A CN112615381A CN 112615381 A CN112615381 A CN 112615381A CN 202011452634 A CN202011452634 A CN 202011452634A CN 112615381 A CN112615381 A CN 112615381A
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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
- H02J3/12—Circuit arrangements for ac mains or ac distribution networks for adjusting voltage in ac networks by changing a characteristic of the network load
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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
- H02J3/007—Arrangements for selectively connecting the load or loads to one or several among a plurality of power lines or power sources
- H02J3/0073—Arrangements for selectively connecting the load or loads to one or several among a plurality of power lines or power sources for providing alternative feeding paths between load and source when the main path fails, e.g. transformers, busbars
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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
- H02J3/36—Arrangements for transfer of electric power between ac networks via a high-tension dc link
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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
- Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
- Y02E60/60—Arrangements for transfer of electric power between AC networks or generators via a high voltage DC link [HVCD]
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Abstract
The invention discloses a distributed low-voltage distribution network terminal low-voltage treatment device which comprises a rectifying device and an inverting device, wherein the input side of the rectifying device is connected with the output side of a distribution network transformer, three-phase alternating current is boosted and rectified into direct current, and the output side of the rectifying device is connected with the input side of the inverting device; the input side of the inverter is connected with the output side of the rectifier to invert the direct current into single-phase alternating current, and the output side of the inverter is connected with a user. According to the invention, through an alternating current-direct current-alternating current conversion technology, the length of a single-phase alternating current distribution line is obviously shortened, and the quality of terminal voltage is improved; after low-voltage alternating current power distribution is boosted into direct current power distribution, both the line impedance and the line current are reduced, and the line loss is obviously reduced; the device simple to operate can make full use of current distribution lines, need not to lay the cable again, saves and synthesizes the transformation cost.
Description
Technical Field
The invention relates to the technical field of low-voltage distribution network voltage treatment, in particular to a distributed low-voltage distribution network terminal low-voltage treatment device.
Background
Along with the improvement of the living standard of residents, the types and the number of household appliances are continuously increased, and the requirement on the voltage quality of a power distribution network also becomes an important test of power supply enterprises. The national standard of the deviation of the power quality supply voltage (GB/T12325-2008) states that the deviation of the 220V single-phase supply voltage is within + 7% and-10% of the nominal voltage. However, in some remote mountainous areas and rural areas, the problem of low voltage at the tail end of the power distribution network generally exists, the contradiction between the power supply capacity and the power consumption demand is very prominent, and the overall characteristics of obvious locality, time-interval property and the like are presented. The construction of the distribution network in these areas is influenced by factors such as load distribution, geographical environment and economic level, and the means for treating low voltage is very limited. For ordinary residents, low voltage causes that high-power electric appliances cannot be normally used, the power utilization efficiency is reduced, and some electric machinery equipment even has the risk of locked rotor damage caused by low voltage. For the power grid, when power is transmitted for a certain time, the low voltage can cause the current transmitted by the line to increase, the transformer loss and the line loss increase, the transmission efficiency is reduced, and the line trip can be caused in serious cases.
One of the important reasons for the low voltage problem is that the radius of a single-phase alternating current power supply line at the end of power distribution is long, the diameter of a power supply cable is small, and besides the resistance of the line, certain impedance can be generated on the line by the transmission of alternating current signals. Aiming at the low voltage problem, the current common treatment measure is to optimize and transform the distribution line and increase the capacity of the distribution transformer. However, the method has the problems of long construction period, high construction cost, low return on investment and the like, and particularly has great construction difficulty in mountainous areas and hilly lands with inconvenient traffic, which is a non-negligible factor. In addition, with the improvement of the electricity utilization environment and the increase of high-power loads in the houses of residents, the line which is transformed may have a low voltage problem again due to the continuous increase of the electricity utilization loads.
Disclosure of Invention
Aiming at the defects and shortcomings in the prior art, the invention provides a distributed low-voltage distribution network terminal low-voltage treatment device, based on the existing distribution network, the traditional alternating current distribution is boosted into direct current distribution through a power electronic converter technology, the problem of terminal low voltage of alternating current low-voltage long-distance transmission is solved, and the terminal voltage quality is improved; the boosted direct current distribution is adopted, so that both the line impedance and the current flowing through the line are reduced, and the line loss is reduced; make full use of current distribution lines, equipment fixing and construction convenience reduce and synthesize the transformation cost.
In order to achieve the purpose, the invention provides a distributed low-voltage distribution network terminal low-voltage treatment device, which comprises a rectifying device and an inverter device, wherein:
the rectifying device is used for boosting and rectifying the three-phase alternating current into direct current and automatically switching between a direct current distribution mode and a bypass mode according to the system state;
the inverter is used for inverting the direct current into single-phase alternating current and automatically switching between a direct current distribution mode and a bypass mode according to the state of the system;
the input side of the rectifying device is connected with the three-phase alternating current at the output side of the distribution network transformer, and the output side of the rectifying device is connected with the input side of the inverter device; the input side of the inverter is connected with the output side of the rectifier, the output side of the inverter is connected with a user, the rectifier and the inverter interact instructions and state information in a carrier communication mode and a wireless communication mode, and the two communication modes are mutually redundant and backup. .
Further, rectifier unit includes three-phase circuit breaker, input carrier module, ACDC conversion module, direct current relay, bypass relay, output carrier module, wireless communication module and host system, wherein:
the three-phase circuit breaker controls the on-off of the input electric energy of the rectifying device;
the input carrier module is communicated with the uplink equipment and used for exchanging information;
the ACDC conversion module is used for bearing the alternating current-direct current electric energy conversion function;
the direct current relay controls the on-off of the direct current output by the ACDC conversion module;
the bypass relay controls the on-off of bypass single-phase alternating current;
the output carrier module is communicated with the inverter device and used for information interaction;
the wireless communication module is communicated with the inverter and other remote equipment to exchange information;
the main control module is used as a control core of the rectifying device and realizes switching control of various modes;
the connection relationship is that the input side of the three-phase circuit breaker is connected with a three-phase alternating current input interface of the device, the output side of the three-phase circuit breaker is connected with the input side of the ACDC conversion module, the output side of the ACDC conversion module is connected with the output interface of the device after passing through a direct current relay, a phase live wire and a zero line in the three-phase alternating current are directly connected with the output interface of the device through a bypass relay, and the main control module is connected with the input carrier module, the output carrier module and the wireless communication module.
Further, inverter includes input circuit breaker, input carrier module, direct current relay, DCDC conversion module, DCAC conversion module, exchanges relay, output carrier module, output circuit breaker, wireless communication module, host system and bypass relay, wherein:
the input circuit breaker controls the on-off of the input electric energy of the inverter;
the input carrier module is communicated with the rectifying device and used for exchanging information;
the direct current relay controls the on-off of the direct current input by the DCDC conversion module;
the DCDC current transformation module is used for bearing the direct current-direct current electric energy transformation function;
the DCAC conversion module is used for bearing the DC-AC electric energy conversion function;
the alternating current relay controls the on-off of the alternating current output by the DCAC current transformation module;
the output carrier module is communicated with the downlink equipment and used for exchanging information;
the output circuit breaker controls the on-off of the output electric energy of the inverter;
the wireless communication module is communicated with the rectifying device and other remote equipment to exchange information;
the main control module is used as a control core of the inverter to realize the switching control of various modes;
the bypass relay controls the on-off of bypass single-phase alternating current;
the input side of the input breaker is connected with the input interface of the device, the output side of the input breaker is connected with the input side of the DCDC conversion module after passing through the direct current relay, the output side of the DCDC conversion module is connected with the input side of the DCAC conversion module, the output side of the DCAC conversion module is connected with the input side of the output breaker after passing through the alternating current relay, the output side of the output breaker is connected with the output interface of the device, the output side of the input breaker is connected with the input side of the output breaker through the bypass relay, and the main control module is connected with the input carrier module, the output carrier module and the wireless communication module.
Furthermore, instructions and state information can be interacted between the rectifying device and the inverter device through carrier communication and wireless communication modes, and the two communication modes are mutually redundant and backup.
Further, the rectifying device and the inverter device can automatically switch between the direct current power distribution mode and the bypass mode according to the system state.
Further, when the rectifying device and the inverter device work in a direct current power distribution mode, the rectifying device boosts and rectifies alternating current into direct current through an electronic power inversion technology, the direct current is transmitted to the inverter device, and the inverter device inverts the direct current into the alternating current through the electronic power inversion technology.
Further, when the rectifying device and the inverter device work in a bypass mode, the input side of the rectifying device is directly connected with the output side of the inverter device through a bypass relay of the rectifying device and the inverter device, and the input alternating current of the rectifying device is transmitted to a user.
The invention has the beneficial technical effects that: through the distributed low-voltage distribution network terminal low-voltage treatment device, the existing distribution line can be fully utilized, cables do not need to be laid again, and through an alternating current-direct current-alternating current conversion technology, the length of the single-phase alternating current distribution line can be obviously shortened, the voltage drop of the line is reduced, and the terminal voltage quality is improved; after low-voltage alternating current distribution is boosted into direct current distribution, the impedance of a line is reduced, the current flowing through the line is reduced, and the line loss can be obviously reduced; the device simple to operate can make full use of current distribution lines, need not to lay the cable again, saves and synthesizes the transformation cost.
Drawings
Fig. 1 is an overall connection schematic diagram of a distributed low-voltage distribution network terminal low-voltage treatment device of the invention.
Fig. 2 is a schematic diagram of the internal structure of a rectifying device of the low-voltage treatment device at the tail end of the distributed low-voltage distribution network.
Fig. 3 is a schematic diagram of the internal structure of an inverter of the low-voltage treatment device at the tail end of the distributed low-voltage distribution network.
Fig. 4 is a flow chart of normal start-up of the distributed low-voltage distribution network terminal low-voltage treatment device of the invention.
Fig. 5 is a flow chart of the abnormal treatment of the rectifying device of the low voltage treatment device at the tail end of the distributed low voltage distribution network.
Fig. 6 is a flow chart of the inverter device exception handling of the distributed low-voltage distribution network terminal low-voltage governance device of the present invention.
Fig. 7 is an abnormal recovery flow chart of the distributed low-voltage distribution network terminal low-voltage governance device of the invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is described in further detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and do not limit the invention.
The invention discloses a tail end low-voltage treatment device of a distributed low-voltage distribution network, which comprises a rectifying device and an inverting device, wherein the rectifying device is positioned close to a transformer side, the inverting device is positioned close to a user side, when the device works in a direct-current distribution mode, the rectifying device boosts and rectifies three-phase alternating current output by the transformer into direct current, the direct current is transmitted to the inverting device side through an existing distribution line, and the inverting device inverts the direct current into single-phase alternating current to be transmitted to a user through the existing distribution line.
The internal structure of the rectifying device is shown in fig. 2, and comprises a three-phase circuit breaker, an input carrier module, an ACDC converter module, a dc relay, a bypass relay, an output carrier module, a wireless communication module and a main control module.
The three-phase circuit breaker controls the on-off of the input electric energy of the rectifying device.
The main control module is used as a control core of the rectifying device, is communicated with other uplink equipment through the input carrier module, and is communicated with the inverter device through the output carrier module and the wireless communication module to exchange control instructions and state information.
And the main control module controls the on and off of the direct current relay and the bypass relay according to the working state of the system.
The ACDC conversion module has the function of alternating current-direct current electric energy conversion and boosts and rectifies input three-phase alternating current into direct current.
The internal structure of the inverter is shown in fig. 3, and comprises an input breaker, an input carrier module, a direct current relay, a DCDC converter module, a DCAC converter module, an alternating current relay, an output carrier module, an output breaker, a wireless communication module, a main control module and a bypass relay.
The input breaker controls the on-off of the input electric energy of the inverter device, and the output breaker controls the on-off of the output electric energy of the inverter device.
The master control module is used as a control core of the inverter, can be communicated with the rectifying device through the input carrier module and the wireless communication module, interacts control instructions and state information, and is communicated with a user ammeter through the output carrier module to complete a meter reading function.
The DCDC converter module bears the function of direct current-direct current electric energy conversion, and converts the input direct current of the DCDC converter module into the input direct current required by the DCAC converter module.
The DCAC conversion module undertakes the function of DC-AC electric energy conversion and converts the input DC into single-phase AC required by the user.
The normal starting process of the low-voltage treatment device at the tail end of the distributed low-voltage distribution network is shown in fig. 4:
and after an input circuit breaker and an output circuit breaker of the inverter device and a three-phase circuit breaker of the rectifier device are closed, the rectifier device is electrified for self-checking, and after the ACDC conversion module is judged to be in a normal state and all relays are in an off state, the bypass relay is closed.
And the inverter is electrified for self-checking and is in an interactive state with the rectifying device.
And after the rectifying device confirms that the direct current power supply mode can be switched, the bypass relay is disconnected, the inverter is powered off, then the rectifying device closes the direct current relay, and the ACDC conversion module is controlled to output direct current.
And the inverter device is electrified and self-checked again, interacts with the rectifying device in a state, and closes the direct current relay after confirming that the direct current distribution mode is entered.
The inverter device controls the DCDC converter module to output direct current, after the output voltage is stable, the DCAC converter module is controlled to output single-phase alternating current, after the start is completed and the output is stable, the alternating current relay is closed, and the system enters a direct current distribution mode.
When the distributed low-voltage distribution network terminal low-voltage governance device is in the direct-current distribution operation mode, if the rectifying device detects a fault, the distributed low-voltage distribution network terminal low-voltage governance device can enter a bypass mode from the direct-current distribution mode, as shown in fig. 5:
the rectifier device disconnects the direct current relay, the inverter device is powered off, and then the rectifier device closes the bypass relay.
And the inverter is electrified for self-checking and is in an interactive state with the rectifying device. And after the inverter device confirms to enter the bypass mode, the bypass relay is closed, and the system completes mode switching and enters the bypass mode.
When the terminal low-voltage governance device of the distributed low-voltage distribution network is in the direct-current distribution operation mode, if the inverter device detects a fault, the terminal low-voltage governance device of the distributed low-voltage distribution network can enter a bypass mode from the direct-current distribution mode, as shown in fig. 6:
the inverter device disconnects the AC relay and the DC relay.
And after the rectifying device and the inverter are in an interactive state and the bypass mode is confirmed to be entered, the rectifying device disconnects the direct-current relay, the inverter is powered off, and then the rectifying device closes the bypass relay.
And the inverter is electrified for self-checking and is in an interactive state with the rectifying device. And after the inverter device confirms to enter the bypass mode, the bypass relay is closed, and the system completes mode switching and enters the bypass mode.
When the tail end low-voltage governance device of the distributed low-voltage distribution network is in the bypass operation mode, if the faults of the rectifying device and the inverter are recovered, the tail end low-voltage governance device of the distributed low-voltage distribution network can enter the direct-current distribution mode from the bypass mode, as shown in fig. 7.
The inverter device disconnects the bypass relay, the rectifier device disconnects the bypass relay, and the inverter device is powered off.
And the rectifying device closes the direct current relay to control the ACDC conversion module to output direct current.
And the inverter is electrified for self-checking, interacts with the rectifier, and closes the direct current relay after confirming that the direct current distribution mode is entered.
The inverter device controls the DCDC converter module to output direct current, after the output voltage is stable, the DCAC converter module is controlled to output single-phase alternating current, after the starting is completed and the output is stable, the alternating current relay is closed, the system completes the mode switching, and the system enters a direct current power distribution mode.
The above-mentioned embodiments are illustrative of the specific embodiments of the present invention, and are not restrictive, and those skilled in the relevant art can make various changes and modifications to obtain corresponding equivalent technical solutions without departing from the spirit and scope of the present invention, so that all equivalent technical solutions should be included in the scope of the present invention.
Claims (5)
1. The utility model provides a device is administered to terminal low-voltage of distributing type low-voltage power distribution network, contains rectifier unit and inverter, its characterized in that:
the rectifying device is used for boosting and rectifying the three-phase alternating current into direct current and automatically switching between a direct current distribution mode and a bypass mode according to the system state;
the inverter is used for inverting the direct current into single-phase alternating current and automatically switching between a direct current distribution mode and a bypass mode according to the state of the system;
the input side of the rectifying device is connected with the three-phase alternating current at the output side of the distribution network transformer, and the output side of the rectifying device is connected with the input side of the inverter device; the input side of the inverter is connected with the output side of the rectifier, the output side of the inverter is connected with a user, the rectifier and the inverter interact instructions and state information in a carrier communication mode and a wireless communication mode, and the two communication modes are mutually redundant and backup.
2. The distributed low-voltage distribution network terminal low-voltage treatment device according to claim 1, wherein the rectifying device comprises a three-phase circuit breaker, an input carrier module, an ACDC converter module, a DC relay, a bypass relay, an output carrier module, a wireless communication module and a main control module, wherein:
the three-phase circuit breaker is used for controlling the on-off of the input electric energy of the rectifying device;
the input carrier module is communicated with the uplink equipment and used for exchanging information;
the ACDC conversion module is used for bearing the alternating current-direct current electric energy conversion function;
the direct current relay is used for controlling the on-off of the direct current output by the ACDC conversion module;
the bypass relay is used for controlling the on-off of bypass single-phase alternating current;
the output carrier module is communicated with the inverter device and used for information interaction;
the wireless communication module is communicated with the inverter and other remote equipment to exchange information;
the main control module is used as a control core of the rectifying device and realizes switching control of various modes;
the connection relationship is that the input side of the three-phase circuit breaker is connected with a three-phase alternating current input interface of the device, the output side of the three-phase circuit breaker is connected with the input side of the ACDC conversion module, the output side of the ACDC conversion module is connected with an output interface of the device after passing through the direct current relay, a live wire and a zero wire of one phase of three-phase alternating current are directly connected with the output interface of the device through the bypass relay, and the main control module is connected with the input carrier module, the output carrier module and the wireless communication module.
3. The distributed low-voltage distribution network terminal low-voltage treatment device according to claim 1, wherein the inverter comprises an input breaker, an input carrier module, a direct current relay, a DCDC converter module, a DCAC converter module, an alternating current relay, an output carrier module, an output breaker, a wireless communication module, a main control module and a bypass relay, wherein:
the input circuit breaker controls the on-off of the input electric energy of the inverter;
the input carrier module is communicated with the rectifying device and used for exchanging information;
the direct current relay controls the on-off of the direct current input by the DCDC conversion module;
the DCDC current transformation module is used for bearing the direct current-direct current electric energy transformation function;
the DCAC conversion module is used for bearing the DC-AC electric energy conversion function;
the alternating current relay controls the on-off of the alternating current output by the DCAC current transformation module;
the output carrier module is communicated with the downlink equipment and used for exchanging information;
the output circuit breaker controls the on-off of the output electric energy of the inverter;
the wireless communication module is communicated with the rectifying device and other remote equipment to exchange information;
the main control module is used as a control core of the inverter to realize the switching control of various modes;
the bypass relay controls the on-off of bypass single-phase alternating current;
the input side of the input breaker is connected with a device input interface, the output side of the input breaker is connected with the input side of the DCDC conversion module after passing through the direct current relay, the output side of the DCDC conversion module is connected with the input side of the DCAC conversion module, the output side of the DCAC conversion module is connected with the input side of the output breaker after passing through the alternating current relay, the output side of the output breaker is connected with the device output interface, the output side of the input breaker is connected with the input side of the output breaker through the bypass relay, and the main control module is connected with the input carrier module, the output carrier module and the wireless communication module.
4. The device for treating the low voltage at the tail end of the distributed low-voltage power distribution network according to claim 1, wherein in the direct-current power distribution mode, the rectifying device boosts and rectifies alternating current into direct current through an electronic-electronic conversion technology, and transmits the direct current to the inverting device, and the inverting device inverts the direct current into the alternating current through the electronic-power inversion technology.
5. The distributed low-voltage distribution network terminal low-voltage treatment device as claimed in claim 1, wherein in the bypass mode, an input side of the rectifying device is directly connected with an output side of the inverter device through a bypass relay of the rectifying device and the inverter device, and an input alternating current of the rectifying device is transmitted to a user.
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| CN113489349A (en) * | 2021-08-20 | 2021-10-08 | 青岛鼎信通讯股份有限公司 | Control method of voltage-sharing circuit of low-voltage treatment device at tail end of low-voltage distribution network |
| CN113507221A (en) * | 2021-08-20 | 2021-10-15 | 青岛鼎信通讯股份有限公司 | Be applied to rectification contravariant equipment that low voltage administered |
| CN113644661A (en) * | 2021-09-01 | 2021-11-12 | 青岛鼎信通讯股份有限公司 | Low-voltage distribution network terminal low-voltage governance parallel compensation device |
| CN113659721A (en) * | 2021-08-18 | 2021-11-16 | 国网湖南省电力有限公司 | Module synchronization method applied to symmetrical bridge type voltage regulating device |
| CN113675829A (en) * | 2021-09-01 | 2021-11-19 | 青岛鼎信通讯股份有限公司 | Direct-current short-circuit fault current-limiting circuit of low-voltage treatment device and control method thereof |
| CN115021306A (en) * | 2022-06-06 | 2022-09-06 | 国网福建省电力有限公司 | Flexible direct current voltage regulation output device |
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