CN117013586A - Mobile power channel transmission device and application method thereof - Google Patents
Mobile power channel transmission device and application method thereof Download PDFInfo
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- CN117013586A CN117013586A CN202310793613.4A CN202310793613A CN117013586A CN 117013586 A CN117013586 A CN 117013586A CN 202310793613 A CN202310793613 A CN 202310793613A CN 117013586 A CN117013586 A CN 117013586A
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- 230000002457 bidirectional effect Effects 0.000 claims description 6
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- 238000013486 operation strategy Methods 0.000 abstract description 2
- 238000000605 extraction Methods 0.000 abstract 1
- 238000004378 air conditioning Methods 0.000 description 2
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- 230000004927 fusion Effects 0.000 description 2
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- 238000010420 art technique Methods 0.000 description 1
- 229910052799 carbon Inorganic materials 0.000 description 1
- 230000005611 electricity Effects 0.000 description 1
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- 230000007774 longterm Effects 0.000 description 1
- 238000012423 maintenance Methods 0.000 description 1
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Classifications
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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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- 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
- H02J13/00002—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 monitoring
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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
- H02J13/00004—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 power network being locally controlled
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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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- Engineering & Computer Science (AREA)
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- Supply And Distribution Of Alternating Current (AREA)
Abstract
The flexible straight device aims at solving the problems that the flexible straight device in the prior art cannot realize automatic control and adjustment and cannot be used continuously. The utility model provides a portable electric energy channel transmission device realizes that through flexible direct current interconnection equipment follow near district transformer extraction electric energy and gives heavy overload district power supply, and the heavy overload district that send draws electric energy and gives adjacent district power supply. In order to achieve the technical effect, the application comprises a box body, wherein two direct current conversion units are arranged in the box body, each direct current conversion unit structure comprises a power conversion unit which is connected with different areas, and each power conversion unit is connected with a main controller. The whole structure of the product is smaller than that of the existing arbitrary vehicle-mounted flexible straight system. One device may service multiple blocks at time intervals. When the main controller is not connected with the power service platform, the main controller can be actively started and stopped through the built-in operation strategy, so that unmanned safe operation is realized.
Description
Technical Field
The disclosure relates to a flexible and straight device for electric power, and in particular relates to a mobile electric energy channel transmission device and a use method of the device.
Background
With the seasonal electricity utilization peak of air conditioners and the like, the problems of heavy overload and reverse feeding heavy overload of a platform area and the like are obvious due to the connection of unbalanced source loads such as charging piles and photovoltaics. The simple capacity-increasing and supplementing points cannot meet the requirements of the novel power system environment, the cost is too high, the transformer loss is increased, and the realization of the double-carbon target is not facilitated. On the other hand, the transformer residual capacity of the transformer in the area adjacent to the heavy overload can be excavated, and an electric energy channel transmission device convenient to deploy is needed to solve the contradiction.
Applicant has studied the corresponding flexible straightening system. The patent application number is also filed: 202210529515.5A mobile flexible-direct-current electric energy transfer vehicle and a use method thereof. The application discloses a mobile flexible-direct-current electric energy transfer vehicle and a use method thereof. The using method specifically comprises the steps of detecting the running state of a platform area, determining an access platform area of a mobile flexible-direct-current power transfer vehicle, allocating the mobile flexible-direct-current power transfer vehicle to a corresponding access position, acquiring power data in the platform area, determining an operation mode and adjusting content, and adjusting the first alternating-current power electronic converter and the second alternating-current power electronic converter according to the adjusting content. The application can enable the power transfer between stations to be more flexible, and effectively improve the use efficiency of the flexible-straightening equipment.
However, as an in-vehicle apparatus, the present application has some drawbacks. Firstly, the whole regulation process still needs to be managed by the power service platform, and automatic control and regulation cannot be realized. Meanwhile, short plates exist in the aspects of stay time limit and continuous operation of vehicle-mounted equipment, and the vehicle itself needs maintenance. The prior art techniques are therefore only suitable for short-term use, e.g. supporting large shows, events, etc., and are not suitable for some long-term needs.
Disclosure of Invention
In order to solve the technical problem, the present disclosure provides a mobile power channel transmission device, through a set of updated power equipment, power is extracted from a transformer in a nearby station area through a flexible direct current interconnection device to supply power to a heavy overload station area, and the heavy overload station area is reversely fed to extract power to supply power to an adjacent station area. The whole device is easy to install, disassemble and move.
In order to achieve the technical effect, the application adopts the following specific technical scheme: the utility model provides a portable electric energy channel transmission device, includes the box, be equipped with two at least direct current conversion units in the box, every direct current conversion unit structure is the same, all include a power conversion unit, thereby the direct current end of the power conversion unit in every direct current conversion power is reciprocal to be connected and is realized AC/DC and DC/AC's conversion, the alternating current end of every power conversion unit is connected different platform district respectively, a master controller is connected respectively to every power conversion unit, interconnect between a plurality of master controllers, the master controller other end is connected to the integration terminal through the collector
Preferably, the ac terminal of the power conversion unit is connected to the bay through an ac breaker. The alternating current circuit breaker is used as a protection device to ensure the safety during operation.
Preferably, a bidirectional ammeter is further arranged between the power conversion unit and the alternating current breaker, and external alternating current is changed into direct current from the bidirectional ammeter to the power conversion unit.
Preferably, the box body is arranged among a plurality of transformers or terminal branches of a transformer area of the power distribution room.
Preferably, the outlet of the box has a separate terminal box with a plug and play socket, and the low voltage cable is spliced at the terminal box location. In order to ensure that the AC end outlet of the device is easy to install and detach. The wiring needs to ensure phase-to-phase isolation, prevent short circuit,
preferably, the two main controllers are mutually connected through 485/CAN communication, so that the power scheduling of the station area is automatically realized; the master controller communicates with the converged terminal or concentrator via a carrier or micro-power wireless use 645 protocol.
The application also comprises a working method of the mobile electric energy channel transmission device, wherein the main controller sends total current data to the equipment after the total current acquired by the fusion terminal or the concentrator is subjected to carrier/micropower wireless interval designated time, the mutual-aid equipment automatically judges whether the mutual-aid is required to be started or not, and starts working when the mutual-aid condition is met, and stops working when the shutdown condition is met. Thus, the equipment is ensured not to be in a working state all the time, and the effect of working according to needs is realized.
Preferably, the two dc conversion units are respectively connected to the first station area and the second station area, and the starting condition for starting the power channel transmission device is as follows:
when the load rate of any one of the areas exceeds beta weight and the load rate difference (beta max-beta min) exceeds the first starting limit, or the load rate of the area is larger than the difference between beta weight and the first starting limit and smaller than beta weight, or the load rate difference exceeds the second starting limit.
Further, the scheduling target after starting is that the difference of the load rates of the two transformers is less than 5%, and energy is provided for the highest load rate by the lowest load rate; when the capacity to be scheduled exceeds the capacity of the device, the device outputs according to the maximum capacity per se.
Further, the condition that the power channel transmission device stops operating includes: the load rate of all the areas is lower than beta weight minus the first starting allowance; or at least one area load rate is larger than beta weight minus the first starting allowance and smaller than beta weight; or the load rate difference value (beta max-beta min) of each station area is smaller than the second starting allowance; or the load rate of the area exceeds beta weight, and the load rate deviation (beta max-beta min) of each area is smaller than the first starting limit. In each link, the first starting limit and the second starting limit can be preset in the main controller, and the value of the second starting limit is one time of that of the first starting limit. The first starting allowance is usually 10% -15% of the load rate of the platform area, the starting effect is not obvious below 10%, and the control is difficult to allocate above 15%.
Compared with the prior art, the application has more compact integral structure, and the integral volume of the actual product is smaller than that of the existing arbitrary vehicle-mounted flexible straight system. The whole equipment is also fixedly arranged at the positions of a plurality of transformers, terminal branches of a transformer area and the like of a designated power distribution room. When in use, the device is installed, and when in idle, the device can be removed and moved to other adjacent positions. One device may service multiple blocks at time intervals.
In addition, when the main controller is not connected with the power service platform, the main controller can be actively started and stopped through the built-in operation strategy, so that unmanned safe operation is realized.
Drawings
The accompanying drawings, which are included to provide a further understanding of the disclosure and are incorporated in and constitute a part of this specification, illustrate exemplary embodiments of the disclosure and together with the description serve to explain the principles of the disclosure.
Fig. 1 is a schematic diagram of an internal structure of a mobile power channel transmission device according to the present application.
Fig. 2 is a schematic diagram illustrating a start-stop relationship of a mobile power channel transmission device according to an embodiment of the application.
Detailed Description
The present disclosure is described in further detail below with reference to the drawings and the embodiments. It is to be understood that the specific embodiments described herein are merely illustrative of the relevant content and not limiting of the present disclosure. It should be further noted that, for convenience of description, only a portion relevant to the present disclosure is shown in the drawings.
In addition, embodiments of the present disclosure and features of the embodiments may be combined with each other without conflict. The present disclosure will be described in detail below with reference to the accompanying drawings in conjunction with embodiments.
The application relates to a zone beta concept. The transformer area β in the power system refers to the magnitude of frequency fluctuation caused by fluctuation of the load of the transformer area, and can be generally regarded as a transformer load factor. It is a parameter that measures the extent of influence of the region on the frequency stability.
β＝I2/I2N
I2, transformer load current; I2N, secondary rated current of transformer
The calculation formula of the station area beta is as follows:
β＝ΔP/Δf＝ΔPW/S/Δf
wherein:
delta P is the load variation of the station area, and the unit is MW;
Δf is the system frequency variation, in Hz;
s, rated capacity of a station area, wherein the unit is MVA;
ΔPW is the fluctuation of the power of the station area, which is equal to the load variation ΔP, and the unit is MW.
The larger the station area beta is, the larger the influence of the load fluctuation of the station area on the system frequency is, and the higher the adjustment difficulty of the station area is. Therefore, the power dispatching can pay close attention to beta of each station area in operation, and excessive station area load fluctuation of beta is avoided, so that stability of system frequency is ensured.
Generally, a region with beta between 5% and 15% has less influence on the system frequency; the load fluctuation of the station area with beta exceeding 20 percent can have larger influence on the system frequency, the scheduling difficulty of the station area is larger, and special measures are needed to improve the adjusting capability and the system stability of the station area.
Whereas, in the present application, the term beta-weight refers to a heavy load rate, typically 80%;
the higher load rate of the two distribution transformers is beta max, and the lower load rate is beta min.
Therefore, in summary, the zone β in the power system refers to the proportional influence of the load fluctuation of the zone on the frequency variation of the power grid, which is an important parameter for measuring the influence of the zone on the frequency stability of the system.
Load factor refers to the ratio of transformer capacity to district load power (including transformer supplied power and mutual equipment supplied power).
The mobile power channel transmission device comprises a box body, wherein two direct current conversion units are arranged in the box body, each direct current conversion unit has the same structure and comprises a power conversion unit, direct current ends of the power conversion units in the two direct current conversion power supplies are mutually reversely connected so as to realize conversion of AC/DC and DC/AC, alternating current ends of the two power conversion units are respectively connected with two different areas, and the alternating current ends of the power conversion units are connected with the areas through alternating current circuit breakers. And a bidirectional ammeter is further arranged between the power conversion unit and the alternating current circuit breaker, and external alternating current is changed into direct current from the bidirectional ammeter to the power conversion unit. The two power conversion units are respectively connected with a main controller, the two main controllers are connected with each other, and the other end of the main controller is connected to the fusion terminal through the collector. Although the application mainly discloses and successfully realizes the finished product provided with two direct current conversion units, in theoretical application, the practical single mobile power channel transmission device can realize the diversification treatment of 8 areas at most.
The box needs to be customized according to actual demands, an ammeter and a transformer mounting position are reserved in the box, an independent plug-and-play socket junction box is arranged at the outlet of the box, and a low-voltage cable is lapped at the junction box. In the practical application process, the box body is arranged among a plurality of transformers or terminal branches of a transformer area of the power distribution room.
In the whole equipment, communication is a precondition for ensuring the normal operation of the equipment. In the application, two main controllers are mutually connected through 485/CAN communication, so that the power scheduling of the station area is automatically realized; the master controller communicates with the converged terminal or concentrator via a carrier or micro-power wireless use 645 protocol.
In embodiment 1, in order to transfer the commercial and air-conditioning load in villages and reduce the heavy load of the district, the applicant uses a mobile power channel transmission device of the application between the branch user line of the 4 rows of the 2# distribution 1 transformer and the branch user line of the 3 rows of the 1# distribution 2 transformer of the Jiang mountain back. Jiang Mashan the back 1#2#3# three station area interconnection line tail end is fit for mutually and has installed the quick plug female of AC400V low voltage cable, through the quick plug female of two sets of AC400V low voltage cable with mutually the device, guarantees to put into the self-starting mode through power cable quick connection between. The flexible transfer of village business, small workshops and air conditioning loads in the transformer areas is realized. The specific process is as follows:
the main controller sets parameters:
(1) Transformer capacity se 1 、se 2 、se 3 Units: kVA
(2) Load factor threshold beta t1 ，β t2 Wherein beta is t2 <β t1 ，β t1 Default of 85%, beta t2 Default of 70%
(3) Multiple zone load difference threshold beta dt1 ，β dt2 Wherein beta is dt2 Default 20%, beta dt1 Default 10%
(4) Capacity of equipment P 01 、P 02 、P 03
(5) Scheduling period T, unit: s (master t=15 min, carrier t=1 min, 4815 t=2 s).
The specific process comprises the following steps:
(1) The main controller detects three-phase current and voltage at the outlet of the transformer detected by the three mutual-aid equipment of the transformer respectively to obtain apparent power S 1 、S 2 、S 3 Unit kVA
(2) Mutual aid device for respectively calling three areas, and obtaining total running power P of device c1 、P c2 、P c3 The unit kW, the data type is signed number (the energy taken from the station area is positive, and the energy sent to the station area is negative)
(1) Calculating the capacity proportion of the transformer in three areas (only one calculation is needed)
(2) Calculating current actual load rates of three areas
(3) Calculating a reference value
The operation reference values required to be received by the three-zone equipment are respectively P 1 、P 2 、、P 3 The data type is signed number, reactive power is ignored in the calculation process, and the conditions 1, 2 and 3 are the logical AND relations, and the calculation mode is shown in figure 2.
In the present embodiment, the first startup allowance is set to 10% of the total load rate, and the second startup allowance is set to 20% of the total load rate. The conditions for stopping the power channel transmission device are as follows:
1. all the load rates of the areas are lower than beta weight-10%;
2. the load rate of each platform area is larger than beta weight and smaller than beta weight, and the load rate difference (beta max-beta min) of each platform area is smaller than 20%.
3. The load rate of the platform area exceeds beta weight, and the load rate deviation (beta max-beta min) of each platform area is less than 10 percent.
Load factor refers to the ratio of transformer capacity to district load power (including transformer supplied power and mutual equipment supplied power).
The power channel transmission device starts to work when any one of the following conditions is met:
1. when the load rate of a certain station area exceeds beta weight and the load rate difference (beta max-beta min) exceeds 10%, or the load rate of the station area is more than beta weight and less than beta weight, the load rate difference exceeds 20%;
2. the scheduling target is that the load rate difference of the two transformers is less than 5%. The principle is that the lowest load rate provides energy to the highest load rate.
3. When the capacity to be scheduled exceeds the capacity of the device, the device outputs according to the maximum capacity per se.
4. When the load rate of all the areas is lower than beta weight-15%, the equipment exits the mutual aid.
By the arrangement, the application is used for 3 months in summer of the mountain back area, and the requirements of small workshops and business use are met.
In the description of the present specification, reference to the terms "one embodiment/manner," "some embodiments/manner," "example," "a particular example," "some examples," etc., means that a particular feature, structure, material, or characteristic described in connection with the embodiment/manner or example is included in at least one embodiment/manner or example of the application. In this specification, the schematic representations of the above terms are not necessarily for the same embodiment/manner or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments/modes or examples. Furthermore, the various embodiments/modes or examples described in this specification and the features of the various embodiments/modes or examples can be combined and combined by persons skilled in the art without contradiction.
Furthermore, the terms "first," "second," and the like, are used for descriptive purposes only and are not to be construed as indicating or implying a relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defining "a first" or "a second" may explicitly or implicitly include at least one such feature. In the description of the present application, the meaning of "plurality" means at least two, for example, two, three, etc., unless specifically defined otherwise.
It will be appreciated by those skilled in the art that the above-described embodiments are merely for clarity of illustration of the disclosure, and are not intended to limit the scope of the disclosure. Other variations or modifications will be apparent to persons skilled in the art from the foregoing disclosure, and such variations or modifications are intended to be within the scope of the present disclosure.
Claims (10)
1. The utility model provides a portable electric energy channel transmission device, its characterized in that includes the box, be equipped with two at least direct current conversion units in the box, every direct current conversion unit structure is the same, thereby all include a power conversion unit, the direct current end of the power conversion unit in every direct current conversion power is mutual reverse connection realizes AC/DC and DC/AC's conversion, the alternating current end of every power conversion unit is connected different platform district respectively, every power conversion unit is connected a master controller respectively, interconnect between a plurality of master controllers, the master controller other end is connected to the integration terminal through the collector.
2. A mobile power channel transmission device according to claim 1, wherein the ac side of the power conversion unit is connected to the bay by an ac circuit breaker.
3. The portable power channel transmission device according to claim 2, wherein a bidirectional ammeter is further provided between the power conversion unit and the ac circuit breaker, and the external ac power is converted into dc power from the bidirectional ammeter to the power conversion unit.
4. A mobile power channel transmission device according to claim 1, wherein the box is mounted between a plurality of transformers or terminal branches of a distribution room.
5. A mobile power channel transmission device according to claim 1, wherein the outlet of the housing has a separate plug and play socket junction box, and the junction box is adapted to receive the low voltage cable.
6. The mobile power channel transmission device according to claim 1, wherein two main controllers are connected with each other through 485/CAN communication to realize power scheduling of a station area by themselves; the master controller communicates with the converged terminal or concentrator via a carrier or micro-power wireless use 645 protocol.
7. A working method of a mobile electric energy channel transmission device is characterized in that a main controller sends total current data to equipment after a carrier wave/micropower wireless interval is appointed after integrating total current acquired by a terminal or a concentrator, mutual-aid equipment automatically judges whether the mutual-aid is needed to be started or not, works when the mutual-aid condition is met, and stops working when the shutdown condition is met.
8. The method for operating a portable power channel transmission device according to claim 7, wherein the two dc conversion units are connected to the first station area and the second station area, respectively, and the starting conditions for starting the power channel transmission device are:
when the load rate of any one of the areas exceeds beta weight and the load rate difference exceeds the first starting limit, or the load rate of the area is larger than the difference between beta weight and the first starting limit and smaller than beta weight, or the load rate difference exceeds the second starting limit.
9. The method of claim 8, wherein the scheduling target after starting is that the difference between the load rates of the two transformers is less than 5%, and the energy is provided to the highest load rate at the lowest load rate; when the capacity to be scheduled exceeds the capacity of the device, the device outputs according to the maximum capacity per se.
10. The method of operating a mobile power channel transfer device of claim 9, wherein the power channel transfer device is deactivated under conditions comprising: the load rate of all the areas is lower than beta weight minus the first starting allowance; or at least one area load rate is larger than beta weight minus the first starting allowance and smaller than beta weight; or the load rate difference value of each station area is smaller than the second starting allowance; or the load rate of the area exceeds beta weight, and the load rate deviation of each area is smaller than the first starting limit.
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