CN217655182U - Electric energy detection system of medium-voltage power grid - Google Patents
Electric energy detection system of medium-voltage power grid Download PDFInfo
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- CN217655182U CN217655182U CN202221261974.1U CN202221261974U CN217655182U CN 217655182 U CN217655182 U CN 217655182U CN 202221261974 U CN202221261974 U CN 202221261974U CN 217655182 U CN217655182 U CN 217655182U
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- 238000004146 energy storage Methods 0.000 claims abstract description 38
- 238000010248 power generation Methods 0.000 claims abstract description 13
- 238000004891 communication Methods 0.000 claims description 12
- 238000000034 method Methods 0.000 description 16
- 230000009466 transformation Effects 0.000 description 15
- 238000007599 discharging Methods 0.000 description 6
- 238000010276 construction Methods 0.000 description 5
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- 230000002457 bidirectional effect Effects 0.000 description 2
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- 230000009286 beneficial effect Effects 0.000 description 1
- 238000011900 installation process Methods 0.000 description 1
- 238000005259 measurement Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
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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
- Y02E10/00—Energy generation through renewable energy sources
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- Y02E10/56—Power conversion systems, e.g. maximum power point trackers
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Abstract
The utility model discloses an electric energy detecting system of middling pressure electric wire netting, it can reduce the input cost, can reduce the influence to other user's power consumptions, it includes the thread, the power inlet wire is connected to thread one end, the line is assisted in the other end connection, it connects the load respectively through a plurality of parallelly connected branches to assist the line, energy storage system, photovoltaic power generation system, install middling pressure current transformer in the thread and the first connecting wire between the line of assisting, the other end of the thread is connected to one side of middling pressure current transformer, the middling pressure ammeter is connected respectively to middling pressure current transformer's secondary side, low pressure current transformer's the side that once inclines, low pressure current transformer's secondary side series connection low-voltage ammeter.
Description
Technical Field
The utility model relates to a distribution technical field specifically is a medium voltage electric wire netting's electric energy detecting system.
Background
The power distribution system is an important link of an electric power system for electric energy distribution, is used for connecting a power supply system of a power supply company with a user, and mainly comprises a power distribution substation, a high-voltage distribution line, a power distribution transformer, a low-voltage distribution line, corresponding control protection equipment and the like. The distribution network of the distribution system comprises a primary distribution network and a secondary distribution network, wherein the primary distribution network is a medium-high voltage distribution network, the power supply is usually 6-10 kV, the secondary distribution network is a low-voltage distribution network, and the user is generally a 220/380V (0.4 kV) low-voltage system.
The power system is mainly characterized in that the voltage increase and the voltage reduction of various voltage grades are realized through a transformer of a transformer substation, a high-voltage power distribution cabinet, a low-voltage switch cabinet and power distribution equipment connected with cables are arranged, in the power distribution process, the electric energy of a power distribution line needs to be detected, so that the requirements of energy management, countercurrent protection and the like in the power distribution process are met, but in the field of energy storage of the current common power distribution system and micro-grids related to the energy storage, less equipment is used for electric energy detection, a bidirectional intelligent electric meter with the rated working voltage of 10KV needs to be additionally arranged in a 10kV power supply inlet cabinet of a medium-voltage power grid to measure the electric energy, the price of the 10KV bidirectional intelligent electric meter is high, the input cost is increased, in addition, in order to ensure the safety in the construction and installation process, a power supply company needs to cut off the medium-voltage power grid, and the power consumption requirements of other users are influenced.
SUMMERY OF THE UTILITY MODEL
To the above-mentioned problem that exists among the prior art, the utility model provides an electric energy detection system of middling pressure electric wire netting, it can reduce the input cost, can reduce the influence to other user's power consumptions.
In order to achieve the above purpose, the utility model adopts the following technical scheme:
the electric energy detection system of the medium-voltage power grid comprises a main line, wherein one end of the main line is connected with a power inlet wire, the other end of the main line is connected with an auxiliary line, the auxiliary line is respectively connected with a load, an energy storage system and a photovoltaic power generation system through a plurality of parallel branches, and a medium-voltage current transformer is installed in a first connecting wire between the main line and the auxiliary line.
It is further characterized in that the method further comprises the steps of,
the incoming line of the power supply is 10kV;
rated working voltages of the medium-voltage current transformer and the medium-voltage electric meter are 10kV at most;
rated working voltages of the low-voltage current transformer and the low-voltage electric meter are alternating current 220V, direct current 24V or direct current 48V;
a transformer is arranged in each branch between the auxiliary line and the load, the energy storage system and the photovoltaic power generation system;
the transformer is a box-type transformer;
a bus main switch is arranged in the first connecting line between the medium-voltage current transformer and the power inlet wire;
a branch pipe is respectively arranged in each branch between the transformer and the corresponding load, the energy storage system and the photovoltaic power generation system;
the low-voltage electric meter is communicated with the EMS energy management system through communication equipment;
the communication equipment is 485 communication.
Adopt the utility model discloses above-mentioned structure can reach following beneficial effect: in this electric energy detection system, for the electric energy collection, low voltage current transformer, low-voltage ammeter have established ties in proper order at medium voltage current transformer's secondary side, carry out a step-down to the middling pressure through medium voltage current transformer, carry out the secondary step-down to the voltage after once stepping down through low voltage current transformer, obtain the low pressure, this low pressure and the electric energy that corresponds are measured to low voltage ammeter again. The low-voltage current transformer and the low-voltage electric meter are low in price, and the input cost is saved.
When the low-voltage current transformer and the low-voltage electric meter are constructed and installed, a power supply company is not needed to be matched to cut off the corresponding medium-voltage power grid, and only the corresponding low-voltage circuit breaker is needed to be cut off, so that the problem that a large-area-range user has power failure due to the medium-voltage power grid power failure is solved, and the influence on the power utilization of other users is reduced.
Drawings
In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings required to be used in the description of the embodiments are briefly introduced below, the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to these drawings without creative efforts.
FIG. 1 is a schematic diagram of the system topology of the present invention;
fig. 2 is the utility model discloses the wiring schematic diagram of well voltage transformer, low-voltage transformer and low-voltage electric meter in the current loop.
Detailed Description
In order to make the technical solution of the present invention better understood, the technical solution of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative efforts shall belong to the protection scope of the present invention.
It should be noted that the terms "comprises" and "comprising," and any variations thereof, in the description and claims of the present invention and the above-described drawings, are intended to cover a non-exclusive inclusion, such that a process, method, apparatus, product, or apparatus that comprises a list of steps or elements is not necessarily limited to those steps or elements expressly listed, but may include other steps or elements not expressly listed or inherent to such process, method, product, or apparatus.
When adopting two-way middling pressure smart electric meter to detect the electric energy in the middling pressure electric wire netting current return circuit to existence among the prior art, the input cost is high to when middling pressure smart electric meter installation construction, need the power supply company to cut off the power supply to the middling pressure electric wire netting, lead to large tracts of land scope user to have a power failure, influenced the problem of more user power consumption demand. In an embodiment of the present invention, there is provided an electric energy detection system of medium voltage power grid, see fig. 1 and fig. 2, which includes a main line 1, a power inlet wire 2 is connected to one end of the main line 1, an auxiliary wire 3 is connected to the other end of the main line 1, and the voltage of the power inlet wire 2 is medium voltage: 10kV. The auxiliary line 3 is respectively connected with a load 5, an energy storage system 6 and a photovoltaic power generation system 7 through a plurality of parallel branches 4, the energy storage system is used for storing energy, the photovoltaic power generation system is used for generating power, the load comprises various power loads of users, a medium-voltage current transformer 9 is installed in a first connecting line 8 between the main line 1 and the auxiliary line 3, the primary side of the medium-voltage current transformer 9 is connected with the other end of the main line, the secondary side of the medium-voltage current transformer 9 is respectively connected with a medium-voltage electric meter 10, the primary side of a low-voltage current transformer 11 is connected with the secondary side of the medium-voltage electric meter 10, and the secondary side of the low-voltage current transformer 11 is connected with a low-voltage electric meter 12 in series.
In this embodiment, the rated working voltages of the medium-voltage current transformer 9 and the medium-voltage electric meter 10 are 10kV at most; in this embodiment, the rated operating voltage of the low-voltage current transformer 11 and the low-voltage electricity meter 12 is 220V.
A transformer 13 is arranged in each branch 4 between the auxiliary line 3 and the load 5, the energy storage system 6 and the photovoltaic power generation system 7.
A bus main switch Q1 is arranged in a first connecting line 8 between the medium-voltage current transformer 9 and the power supply inlet wire 2, branch switches 15 are respectively arranged in each branch 4 between the transformer and the corresponding load 5, the energy storage system 6 and the photovoltaic power generation system 7, and the bus main switch Q1 is used for controlling the opening or closing of a main power supply in the current loop.
With this application electric energy detection system be applied to 10kV high-voltage incoming line cabinets such as transformer substation or electricity distribution room in for measure the electric energy of thread 1 pass, low-voltage electric meter 12 passes through RS485 communication technology and EMS energy management system communication, and according to the electric energy data that low-voltage electric meter 12 detected to energy storage system 6 charge, discharge and control, charge energy storage system 6, the purpose of discharge control is preventing against current, consequently this application electric energy detection system also is applied to the protection transformation against current in the medium voltage electric wire netting. The EMS energy management system is a standard control module of an energy storage and micro-grid system which is commonly used at present.
Set up at least one set of above-mentioned electric energy detection system in the 10kV power measurement cabinet, bus master switch Q1 in first connecting wire 8 is closed, and branch switch Q2-1, Q2-2, Q2-3 in each branch road 4 are closed, form current loop, and power inlet wire 2's 10kV voltage gets into thread 1, gets into middling pressure current transformer 9 through bus master switch Q1, adopts this electric energy detection system to carry out the step that detects voltage to include:
step one, carrying out primary current reduction on current in a medium-voltage loop through a medium-voltage current transformer 9, and acquiring data after primary transformation ratio through a medium-voltage ammeter 10 to obtain first data;
secondly, performing secondary transformation ratio on the first data through a low-voltage current transformer 11, and acquiring data after the secondary transformation ratio through a low-voltage electric meter 12;
and step three, the low-voltage electric meter 12 communicates with the EMS energy management system through an RS485 communication technology, the collected low-voltage data is transmitted to a processor in the EMS energy management system to be processed, in actual detection, the processor processes the electric energy, current, voltage, power and other data after secondary transformation ratio in a current collecting loop of the low-voltage electric meter, and actual electric energy, current, voltage, power and other data of the medium-voltage power grid are obtained, so that electric energy detection of the medium-voltage power grid is realized.
Before the processor processes the data, the low-voltage electric meter sends the collected data to an EMS energy management system, and the processor in the EMS energy management system sends the collected data to a first current transformer according to the transformation ratio K of the first current transformer 1 And the transformation ratio K of the second current transformer 2 And calculating the actual current and power of the medium-voltage power grid. The actual electric energy of the current loop is P = [ I = [ ] 1 *(K 1 *K2)]*10kV, wherein I1 is the current measured by a low-voltage electric meterAnd the electric energy P is the actual electric energy of the medium-voltage power grid detected by the electric energy detection system, so that the electric energy detection of the medium-voltage power grid of the power distribution system is realized. For another example: the transformation ratio of the 10KV medium-voltage current transformer is 1 50, the transformation ratio of the low-voltage current transformer is 1 80, and the current reading of the low-voltage electric meter is 0.03A, then the actual current I =0.03 × 80 × 50=120a of the 10KV medium-voltage power grid, thereby realizing the current detection of the medium-voltage power grid.
The electric energy detection system can be applied to anti-backflow protection of a medium-voltage power grid, the backflow refers to the situation that the discharge power of the energy storage system is larger than the actual load power of the medium-voltage power grid in the charging and discharging processes of the energy storage system of the medium-voltage power grid, so that the energy storage system transmits power to a superior power grid (the medium-voltage power grid) in a reverse direction, and the anti-backflow protection refers to the situation that the energy storage system is prevented from discharging into the external medium-voltage power grid, so that the discharge power of the energy storage system is ensured to be slightly smaller than the actual load power of the medium-voltage power grid.
Based on above-mentioned electric energy detection system prevents protection against current, EMS energy management system and low-voltage electric meter real time communication to control energy storage system 6 according to the low pressure data that the low-voltage electric meter gathered and the power P who calculates, EMS energy management system still includes the memory, and power P saves in the memory, prevents against current protection mainly to the user in-process, and the energy storage system of peak electricity time period, other periods controls, and the peak electricity time period includes: 8:00-11: 00. 17:00-21:00, the other time periods refer to other time periods except the peak power time period within 24 hours a day, the charging and discharging of the energy storage system 6 are controlled by the EMS energy management system and the controller according to the actual power P in the medium-voltage power grid, and the specific steps comprise: step one, in a peak power period: 8:00-11:00 and 17:00-21:00, if P1 is positive, the discharge power P4= P1-30 of the energy storage system 6, where 30 is the margin.
When the electric energy of the medium-voltage power grid is detected, detection errors inevitably exist, and in order to prevent the energy storage system from generating reverse flow, the discharging power of the energy storage system needs to be ensured to be smaller than the load power (P1) of the medium-voltage power grid, so that the EMS energy management system controls the discharging power of the energy storage system 6 to be P4= P1-30 through the controller, the discharging power of the energy storage system is ensured to be slightly smaller than the load power of the medium-voltage power grid, and the reverse flow prevention protection is realized.
If P1 is negative, it indicates that there is surplus power on-line in the photovoltaic power generation system 7, at this time, the energy storage is not allowed to discharge, and the discharge power P4=0 of the energy storage system, thereby preventing the counter-current problem of the medium-voltage and realizing the counter-current protection;
and step two, in other time periods, the energy storage system 6 is in a standby state or a charging state and does not discharge.
The energy storage system 6 is electrically connected with the controller, and the controller is communicated with the EMS energy management system through RS485 communication, so that the EMS energy management system controls the energy storage system 6, the EMS energy management system sends a signal to the controller through RS485 communication according to the power P1, and the controller controls the energy storage system to be charged, discharged or in a standby state.
Through the control of the EMS energy management system, only the redundant electric quantity of the photovoltaic power generation system can be on the Internet in the energy detection system, and the condition that the energy storage system 6 transmits the electric power back to the external 10kV medium-voltage power grid is prevented. The mode realizes the full utilization of the stored electric energy in the energy storage system 6, prevents the electric energy waste and ensures the income to the maximum extent.
Taking a 250kW/530kWh energy storage system 6 as an example of 10kV countercurrent-prevention transformation project, the electric energy detection system adopts the low-voltage electric meter to replace a medium-voltage electric meter, the transformation cost is reduced from 15 ten thousand RMB of the existing method (10 kV bus side operation, namely, the medium-voltage power grid is powered off through a power supply bureau) to 1.6 thousand RMB of the new method (namely, the low-voltage side operation, namely, the secondary side operation of the low-voltage transformer in the application), and the transformation period is shortened from 1.5 months of the existing method to 3 days of the new method, so that the investment cost is reduced, and the construction period is shortened.
In conclusion, the following steps are combined:
(1) The transformation cost is low, the prices of the low-voltage current transformer 11 and the low-voltage electric meter 12 are cheaper than those of the medium-voltage electric meter, and the equipment investment cost is saved.
(2) The workload is small, large-scale power failure is not required to be carried out by a power grid company or a power supply bureau, the procedure is simplified, large-scale power failure caused by power failure of the voltage at the female side of the medium-voltage power grid is prevented, and the influence on the power utilization requirements of other users is reduced;
(3) If install the middling pressure ammeter in this middling pressure electric wire netting, need additionally to increase trouble record ripples device and trouble separation device, equipment cost and construction cost are all very high, and the installation of this application low pressure ammeter carries out the operation on the low pressure side behind the low pressure current transformer secondary transformation ratio, and the security is higher, has ensured the safety in the work progress, need not to increase trouble record ripples device and trouble separation device in addition again, has reduced transformation expenses such as equipment cost, construction cost, has reduced the input cost.
The above is only a preferred embodiment of the present application, and the present invention is not limited to the above embodiments. It is to be understood that other modifications and variations directly derivable or suggested by those skilled in the art without departing from the spirit and concepts of the invention are to be considered within the scope of the invention.
Claims (7)
1. The utility model provides an electric energy detection system of medium voltage electric wire netting, its includes the thread, thread one end is connected the power inlet wire, and the other end is connected and is assisted the line, it connects load, energy storage system, photovoltaic power generation system respectively through a plurality of parallelly connected branches to assist the line, the thread with install middling pressure current transformer in the first connecting line between the line, its characterized in that, middling pressure current transformer's once side is connected the other end of thread, middling pressure ammeter, low pressure current transformer's once side are connected respectively to middling pressure current transformer's secondary side, low pressure current transformer's secondary side series connection low-voltage ammeter.
2. The power detection system of a medium voltage power network according to claim 1, characterized in that the power inlet line is 10kV.
3. A power detection system for a medium voltage network according to claim 2, characterized in that the rated operating voltage of the medium voltage current transformer, medium voltage meter is up to 10kV.
4. The system for detecting the electric energy of the medium voltage power grid according to claim 2 or 3, wherein the rated working voltage of the low voltage current transformer and the low voltage electric meter is 220V AC, 24V DC or 48V DC.
5. The system for detecting electric energy of a medium voltage electric network according to claim 4, characterized in that a transformer is installed in each of the branches between the auxiliary line and the load, the energy storage system, the photovoltaic power generation system.
6. The power detection system of a medium voltage power grid according to claim 5, characterized in that a bus master switch is arranged in the first connection line between the medium voltage current transformer and the power inlet line; and a separating pipe is respectively arranged in each branch between the transformer and the corresponding load, the energy storage system and the photovoltaic power generation system.
7. The system for detecting the electric energy of the medium voltage electric network according to claim 1 or 6, characterized in that said low voltage electric meter communicates with an EMS energy management system through a communication device; the communication equipment is 485 communication.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202221261974.1U CN217655182U (en) | 2022-05-25 | 2022-05-25 | Electric energy detection system of medium-voltage power grid |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202221261974.1U CN217655182U (en) | 2022-05-25 | 2022-05-25 | Electric energy detection system of medium-voltage power grid |
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| Publication Number | Publication Date |
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| CN217655182U true CN217655182U (en) | 2022-10-25 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN202221261974.1U Expired - Fee Related CN217655182U (en) | 2022-05-25 | 2022-05-25 | Electric energy detection system of medium-voltage power grid |
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- 2022-05-25 CN CN202221261974.1U patent/CN217655182U/en not_active Expired - Fee Related
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Granted publication date: 20221025 |