CN112421644A - Low-voltage load access method for distribution internet of things - Google Patents
Low-voltage load access method for distribution internet of things Download PDFInfo
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- CN112421644A CN112421644A CN202011262689.7A CN202011262689A CN112421644A CN 112421644 A CN112421644 A CN 112421644A CN 202011262689 A CN202011262689 A CN 202011262689A CN 112421644 A CN112421644 A CN 112421644A
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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
- H02J3/14—Circuit arrangements for ac mains or ac distribution networks for adjusting voltage in ac networks by changing a characteristic of the network load by switching loads on to, or off from, network, e.g. progressively balanced loading
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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
- H02J3/26—Arrangements for eliminating or reducing asymmetry in polyphase networks
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
- Y02B70/00—Technologies for an efficient end-user side electric power management and consumption
- Y02B70/30—Systems integrating technologies related to power network operation and communication or information technologies for improving the carbon footprint of the management of residential or tertiary loads, i.e. smart grids as climate change mitigation technology in the buildings sector, including also the last stages of power distribution and the control, monitoring or operating management systems at local level
- Y02B70/3225—Demand response systems, e.g. load shedding, peak shaving
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E40/00—Technologies for an efficient electrical power generation, transmission or distribution
- Y02E40/50—Arrangements for eliminating or reducing asymmetry in polyphase networks
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y04—INFORMATION OR COMMUNICATION TECHNOLOGIES HAVING AN IMPACT ON OTHER TECHNOLOGY AREAS
- Y04S—SYSTEMS INTEGRATING TECHNOLOGIES RELATED TO POWER NETWORK OPERATION, COMMUNICATION OR INFORMATION TECHNOLOGIES FOR IMPROVING THE ELECTRICAL POWER GENERATION, TRANSMISSION, DISTRIBUTION, MANAGEMENT OR USAGE, i.e. SMART GRIDS
- Y04S20/00—Management or operation of end-user stationary applications or the last stages of power distribution; Controlling, monitoring or operating thereof
- Y04S20/20—End-user application control systems
- Y04S20/222—Demand response systems, e.g. load shedding, peak shaving
Abstract
The invention discloses a low-voltage load access method of a power distribution internet of things, which comprises the following steps: acquiring a capacity index, an economic index and a distance index of equipment to be accessed; obtaining an access index of the equipment to be accessed according to preset weight coefficients occupied by the capacity index, the economic index and the distance index, wherein the access index is as follows: capacity index capacity weight coefficient + economic index economic weight coefficient + access distance weight coefficient; and determining the access position of the equipment to be accessed according to the access index. The most appropriate access position of the equipment to be accessed is obtained by measuring and calculating the equipment to be accessed and the network to be accessed, so that the labor expenditure and the workload caused by manual calculation are greatly reduced, the calculation result is more accurate, and the three-phase imbalance and heavy overload of the power distribution network caused by artificial errors are reduced.
Description
Technical Field
The invention relates to the technical field of power network control, in particular to a low-voltage load access method of a power distribution internet of things.
Background
Strengthen the linking of business expansion and application and distribution service, the formulation of overall planning customer power supply scheme and distribution network construction and transformation project scheme arranges in unison that the business expansion connects the electric and power supply facility plan to overhaul the power failure plan, promotes the live working of application for connect the electric speed, reduce the power failure scope. The interconnection and intercommunication of the marketing information system and the dispatching and distribution network system are enhanced, and business expansion installation and power distribution operation information sharing are realized. The customer service center is responsible for providing customer business expansion conditions, including information such as customer classification, electricity utilization address, attachment capacity, predicted highest load, namely average load, voltage class, accessed power supply line and the like; and the distribution department is responsible for providing distribution network operation conditions including information of power supply lines, power supply capacity, openable loads, power supply facility maintenance and the like of each power supply point.
The popularization of the power distribution internet of things low-voltage user access method reduces the time from installation to implementation of a user, and after a customer manager can enter user installation information on a platform, the system finds out an optimal scheme according to the user information in a big data cloud computing mode, so that the problem of traditional manual computing is solved, manpower and material resources are greatly saved, and the time for user installation is shortened. The prior technical scheme has the following defects: the device is based on the technology of the Internet of things, and needs to be based on secondary devices such as a power distribution intelligent terminal, and otherwise, data cannot be accurately calculated; and secondly, accessing the position information of the meter box or the switch and the position of the user, wherein the position information depends on whether the user electric meter is provided with a GPS, otherwise, the specific distance cannot be obtained.
Disclosure of Invention
The embodiment of the invention aims to provide a low-voltage load access method of a power distribution internet of things.
In order to solve the technical problem, the embodiment of the invention provides a low-voltage load access method of a power distribution internet of things, which comprises the following steps:
acquiring a capacity index, an economic index and a distance index of equipment to be accessed;
obtaining an access index of the device to be accessed according to preset weight coefficients respectively occupied by the capacity index, the economic index and the distance index, wherein the access index is as follows: capacity index capacity weight coefficient + economic index economic weight coefficient + access distance weight coefficient;
and determining the access position of the equipment to be accessed according to the access index.
Further, the capacity index is: (configurable capacity-pre-allocated capacity lower limit/pre-allocated capacity lower limit);
the distance index is: (1- (distance of access point to distribution/supply range of distribution)). 100. Further, when the device to be accessed is single-phase access,
when the equipment to be accessed is three-phase accessed,
wherein S isedRepresenting the rated capacity, U, of the distribution transformeredIndicating the low-side rated voltage, I, of the distribution transformeramaxIndicating said distribution transformerMaximum value of phase A current, IbmaxRepresents the maximum value of the B-phase current of the distribution transformer, IcmaxRepresents the maximum value of the C-phase current of the distribution transformer.
Further, acquiring a three-phase unbalance rate, a line loss rate, a voltage qualification rate and/or a load rate of the equipment to be accessed;
and calculating the economic index of the equipment to be accessed according to the respective weights of the three-phase unbalance rate, the line loss rate, the voltage qualification rate and/or the load rate of the equipment to be accessed.
Further, the economic index is: line loss rate weight coefficient + three-phase imbalance rate weight coefficient + voltage percent of pass weight coefficient + load rate weight coefficient.
Further, the obtaining of the three-phase imbalance rate of the device to be accessed is as follows:
three-phase unbalance rate (maximum phase current-minimum phase current)/maximum phase current 100%;
when the device to be accessed is in single-phase access,
when the phase A is connected, the maximum phase current is max (I)a+Ij，Ib，Ic) The minimum phase current is min (I)a+Ij，Ib，Ic)；
When B phase is connected, the maximum phase current is max (I)a，Ib+Ij，Ic) The minimum phase current is min (I)a，Ib+Ij，Ic)；
When C is connected, the maximum phase current is max (I)a，Ib，Ic+Ij) Minimum phase Current min (I)a，Ib，Ic+Ij)；
When the equipment to be accessed is three-phase accessed,
maximum phase current max (I)a+Ij，Ib+Ij，Ic+Ij)；
Minimum phase current min (I)a+Ij，Ib+Ij，Ic+Ij)；
Wherein, IaIndicating the current real-time A-phase current value, I, of the switchbRepresenting the current real-time B-phase current value, I, of the switchcRepresenting the current real-time C-phase current value, I, of the switchjAnd the rated current value of the load to be connected is represented.
Further, the capacity weighting factor is 0.7;
the economic weight coefficient is 0.2;
the distance weight coefficient is 0.1.
Further, the line loss rate weight coefficient is 0.4;
the three-phase unbalance rate weight coefficient is 0.2;
the voltage qualification rate weight coefficient is 0.2;
the load factor weight coefficient is 0.2.
Further, when the lower limit of the pre-distribution capacity is less than 80%, the load rate is 100;
and when the lower limit of the pre-distribution capacity is greater than or equal to 80%, the load rate is 0.
The technical scheme of the embodiment of the invention has the following beneficial technical effects:
the most appropriate access position of the equipment to be accessed is obtained by measuring and calculating the equipment to be accessed and the network to be accessed, so that the labor expenditure and the workload caused by manual calculation are greatly reduced, the calculation result is more accurate, and the three-phase imbalance and heavy overload of the power distribution network caused by artificial errors are reduced.
Drawings
Fig. 1 is a schematic diagram of a power distribution internet of things system provided by an embodiment of the invention;
fig. 2 is a flow chart of a low-voltage load access method of a power distribution internet of things provided by the embodiment of the invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention will be described in further detail with reference to the accompanying drawings in conjunction with the following detailed description. It should be understood that the description is intended to be exemplary only, and is not intended to limit the scope of the present invention. Moreover, in the following description, descriptions of well-known structures and techniques are omitted so as to not unnecessarily obscure the concepts of the present invention.
Fig. 1 is a schematic diagram of a power distribution internet of things system provided by an embodiment of the invention.
Referring to fig. 1, the distribution internet of things is generally divided into a sensing layer, a fusion layer and an application layer from bottom to top. The sensing layer integrates the existing applied system and data of the power supply company, and obtains the information of the user access power point according to the characteristics of the Internet of things. The fusion layer constructs a unified power grid topology and state information model by utilizing the characteristics of the power distribution Internet of things, and realizes high-speed transmission, distributed storage, centralized processing and intelligent analysis of various types of data; the application layer fully embodies the plug-and-play advantages of the micro service according to the characteristics of the power distribution internet of things.
Under the ubiquitous power internet of things, the work of user access mainly uses new installation application information as a data source (namely combining information such as the installation reporting capacity and the load grade of marketing), and mainly focuses on a power supply point scheme, and through an intelligent business process, according to a recent principle, a most economic principle and a maximum capacity principle, mutual discrimination and automatic selection calculation are carried out, and finally, the most reasonable access scheme of a power supply point is obtained.
Fig. 2 is a flow chart of a low-voltage load access method of a power distribution internet of things provided by the embodiment of the invention.
Referring to fig. 2, an embodiment of the present invention provides a power distribution internet of things low-voltage load access method, including the following steps:
s100, acquiring a capacity index, an economic index and a distance index of the equipment to be accessed.
S200, obtaining an access index of the equipment to be accessed according to preset weight coefficients respectively occupied by the capacity index, the economic index and the distance index, wherein the access index is as follows: capacity index capacity weight coefficient + economic index economic weight coefficient + access distance weight coefficient.
And S300, determining the access position of the equipment to be accessed according to the access index.
Specifically, the capacity index is: further, the capacity index is: (configurable capacity-pre-allocated capacity lower limit/pre-allocated capacity lower limit); the lower limit of the pre-allocation capacity refers to that under the condition that the distribution transformer is not overloaded, the lower limit of the pre-allocation capacity is configurable capacity-configurable capacity x 0.2.
The distance index is: (1- (distance of access point to distribution/supply range of distribution)). 100. Further, when the equipment to be accessed is single-phase access,
when the equipment to be accessed is accessed in three phases,
wherein S isedIndicating rated capacity, U, of distribution transformeredIndicating the low-side rated voltage of the distribution transformer, IamaxRepresents the maximum value of the A-phase current of the distribution transformer, IbmaxRepresents the maximum value of the B-phase current of the distribution transformer, IcmaxRepresents the maximum value of the C-phase current of the distribution transformer.
Specifically, the economic index acquisition step is as follows:
acquiring a three-phase unbalance rate, a line loss rate, a voltage qualification rate and/or a load rate of equipment to be accessed;
and calculating the economic index of the equipment to be accessed according to the respective weights of the three-phase unbalance rate, the line loss rate, the voltage qualification rate and/or the load rate of the equipment to be accessed.
Specifically, the economic index is calculated by the formula: line loss rate weight coefficient + three-phase imbalance rate weight coefficient + voltage percent of pass weight coefficient + load rate weight coefficient.
Further, the three-phase imbalance rate of the equipment to be accessed is obtained as follows:
three-phase unbalance rate (maximum phase current-minimum phase current)/maximum phase current 100%;
when the device to be accessed is in single-phase access,
when the phase A is connected, the maximum phase current is max (I)a+Ij，Ib，Ic) The minimum phase current is min (I)a+Ij，Ib，Ic)；
When B phase is connected, the maximum phase current is max (I)a，Ib+Ij，Ic) The minimum phase current is min (I)a，Ib+Ij，Ic)；
When C is connected, the maximum phase current is max (I)a，Ib，Ic+Ij) Minimum phase Current min (I)a，Ib，Ic+Ij)；
When the equipment to be accessed is accessed in three phases,
maximum phase current max (I)a+Ij，Ib+Ij，Ic+Ij)；
Minimum phase current min (I)a+Ij，Ib+Ij，Ic+Ij)；
Wherein, IaIndicating the current real-time A-phase current value, I, of the switchbRepresenting the current real-time B-phase current value, I, of the switchcRepresenting the current real-time C-phase current value, I, of the switchjRepresenting the nominal current value of the load to be switched in.
Specifically, the capacity-weight coefficient is 0.7; the economic weight coefficient is 0.2; the distance weight coefficient was 0.1.
Specifically, the line loss rate weight coefficient is 0.4; the three-phase unbalance rate weight coefficient is 0.2; the voltage qualification rate weight coefficient is 0.2; the load factor weight coefficient was 0.2.
In addition, when the lower limit of the pre-distribution capacity is less than 80%, the load rate is 100; when the lower limit of the pre-allocation capacity is greater than or equal to 80%, the load factor is 0.
TABLE 1
Referring to table 1, for each accessible plan scored in this manner, the values of the relevant terms are illustrated as follows:
the capacity, which has been calculated in the above search for an access point, is calculated based on the calculated configurable capacity and the lower limit of the pre-allocated capacity.
And the economy is calculated by taking the result of the economy calculation.
And calculating the distance according to the position information of the pre-access meter box and the position of the user.
The access index is Ya × Wa + Yb × Wb + Yc × Wc. (Wa \ Wb \ Wc is a user-configured proportional value, and the sum is 100%).
The user calculates the access indexes of the distribution transformer and the switch according to the method, and the higher the access index is, the optimal access position is.
TABLE 2
Referring to table 2, the economic efficiency is Y1 × W1+ Y2 × W2+ Y3 × W3+ Y4 × W4, W1\ W2\ W3 is the user configured indicator ratio, and the sum is 100%.
And the line loss rate value are calculated by acquiring the line loss rate of the meter box incoming line switch from the monthly line loss of the platform area through the meter box in the access scheme.
And the voltage qualification rate value are calculated by acquiring the voltage qualification rate corresponding to the meter box from the voltage qualification rate of the meter box through the meter box in the access scheme.
And the load rate, namely the load rate value is obtained by counting the corresponding load rate value according to the load rate of the distribution transformer in 365 days.
The embodiment of the invention aims to protect a low-voltage load access method of a power distribution internet of things, which comprises the following steps: acquiring a capacity index, an economic index and a distance index of equipment to be accessed; obtaining an access index of the equipment to be accessed according to preset weight coefficients occupied by the capacity index, the economic index and the distance index, wherein the access index is as follows: capacity index capacity weight coefficient + economic index economic weight coefficient + access distance weight coefficient; and determining the access position of the equipment to be accessed according to the access index. The technical scheme has the following effects:
the most appropriate access position of the equipment to be accessed is obtained by measuring and calculating the equipment to be accessed and the network to be accessed, so that the labor expenditure and the workload caused by manual calculation are greatly reduced, the calculation result is more accurate, and the three-phase imbalance and heavy overload of the power distribution network caused by artificial errors are reduced.
It is to be understood that the above-described embodiments of the present invention are merely illustrative of or explaining the principles of the invention and are not to be construed as limiting the invention. Therefore, any modification, equivalent replacement, improvement and the like made without departing from the spirit and scope of the present invention should be included in the protection scope of the present invention. Further, it is intended that the appended claims cover all such variations and modifications as fall within the scope and boundaries of the appended claims or the equivalents of such scope and boundaries.
Claims (9)
1. A low-voltage load access method of a power distribution Internet of things is characterized by comprising the following steps:
acquiring a capacity index, an economic index and a distance index of equipment to be accessed;
obtaining an access index of the device to be accessed according to preset weight coefficients respectively occupied by the capacity index, the economic index and the distance index, wherein the access index is as follows: capacity index capacity weight coefficient + economic index economic weight coefficient + access distance weight coefficient;
and determining the access position of the equipment to be accessed according to the access index.
2. The power distribution Internet of things low-voltage load access method according to claim 1,
the capacity index is: (configurable capacity-lower pre-allocated capacity limit)/lower pre-allocated capacity limit;
the distance index is: (1- (distance of access point to distribution/supply range of distribution)). 100.
3. The power distribution Internet of things low-voltage load access method according to claim 2,
when the device to be accessed is in single-phase access,
when the equipment to be accessed is three-phase accessed,
wherein S isedRepresenting the rated capacity, U, of the distribution transformeredIndicating the low-side rated voltage, I, of the distribution transformeramaxRepresents the maximum value of the A-phase current of the distribution transformer, IbmaxRepresenting said distribution transformerMaximum value of B-phase current, IcmaxRepresents the maximum value of the C-phase current of the distribution transformer.
4. The power distribution internet of things low-voltage load access method according to claim 2, wherein the economic index obtaining step is as follows:
acquiring a three-phase unbalance rate, a line loss rate, a voltage qualification rate and/or a load rate of equipment to be accessed;
and calculating the economic index of the equipment to be accessed according to the respective weights of the three-phase unbalance rate, the line loss rate, the voltage qualification rate and/or the load rate of the equipment to be accessed.
5. The power distribution Internet of things low-voltage load access method according to claim 4,
the economic index is as follows: line loss rate weight coefficient + three-phase imbalance rate weight coefficient + voltage percent of pass weight coefficient + load rate weight coefficient.
6. The power distribution Internet of things low-voltage load access method according to claim 5,
the three-phase unbalance rate of the equipment to be accessed is obtained as follows:
three-phase unbalance rate (maximum phase current-minimum phase current)/maximum phase current 100%;
when the device to be accessed is in single-phase access,
when the phase A is connected, the maximum phase current is max (I)a+Ij，Ib，Ic) The minimum phase current is min (I)a+Ij，Ib，Ic)；
When B phase is connected, the maximum phase current is max (I)a，Ib+Ij，Ic) The minimum phase current is min (I)a，Ib+Ij，Ic)；
When C is connected, the maximum phase current is max (I)a，Ib，Ic+Ij) Minimum phase Current min (I)a，Ib，Ic+Ij)；
When the equipment to be accessed is three-phase accessed,
maximum phase current max (I)a+Ij，Ib+Ij，Ic+Ij)；
Minimum phase current min (I)a+Ij，Ib+Ij，Ic+Ij)；
Wherein, IaIndicating the current real-time A-phase current value, I, of the switchbRepresenting the current real-time B-phase current value, I, of the switchcRepresenting the current real-time C-phase current value, I, of the switchjAnd the rated current value of the load to be connected is represented.
7. The power distribution Internet of things low-voltage load access method according to claim 1,
the capacity weight coefficient is 0.7;
the economic weight coefficient is 0.2;
the distance weight coefficient is 0.1.
8. The power distribution Internet of things low-voltage load access method according to claim 5,
the line loss rate weight coefficient is 0.4;
the three-phase unbalance rate weight coefficient is 0.2;
the voltage qualification rate weight coefficient is 0.2;
the load factor weight coefficient is 0.2.
9. The power distribution Internet of things low-voltage load access method according to claim 4,
when the lower limit of the pre-distribution capacity is less than 80%, the load rate is 100;
and when the lower limit of the pre-distribution capacity is greater than or equal to 80%, the load rate is 0.
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| PCT/CN2021/126442 WO2022100433A1 (en) | 2020-11-12 | 2021-10-26 | Method for accessing low-voltage load in internet of things power distribution |
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| WO2022100433A1 (en) * | 2020-11-12 | 2022-05-19 | 珠海许继芝电网自动化有限公司 | Method for accessing low-voltage load in internet of things power distribution |
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| CN112421644B (en) | 2023-06-16 |
| WO2022100433A1 (en) | 2022-05-19 |
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