CN115459280A - Operation control method of distribution double transformers - Google Patents
Operation control method of distribution double transformers Download PDFInfo
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- CN115459280A CN115459280A CN202211413064.5A CN202211413064A CN115459280A CN 115459280 A CN115459280 A CN 115459280A CN 202211413064 A CN202211413064 A CN 202211413064A CN 115459280 A CN115459280 A CN 115459280A
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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
- H02J3/04—Circuit arrangements for ac mains or ac distribution networks for connecting networks of the same frequency but supplied from different sources
- H02J3/06—Controlling transfer of power between connected networks; Controlling sharing of load between connected networks
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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
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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
- H02J2203/00—Indexing scheme relating to details of circuit arrangements for AC mains or AC distribution networks
- H02J2203/20—Simulating, e g planning, reliability check, modelling or computer assisted design [CAD]
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Abstract
The application relates to an operation control method of a distribution double transformer. The method comprises the following steps: the method comprises the steps of collecting current and voltage information of a first distribution transformer and a second distribution transformer in a current time period, determining load coefficients corresponding to the first distribution transformer and the second distribution transformer in the current time period, controlling the first distribution transformer and the second distribution transformer to be switched to a wheel-off operation mode to operate under the condition that the load coefficients corresponding to the first distribution transformer and the second distribution transformer are both smaller than a preset loss boundary point load coefficient and the current operation mode is not a wheel-off operation mode, controlling the first distribution transformer and the second distribution transformer to be switched to a column-split operation mode to operate under the condition that the load coefficients corresponding to the first distribution transformer and the second distribution transformer are both larger than a preset loss boundary point load coefficient and the current operation mode is not a column-split operation mode, and accordingly reducing overall operation loss on the basis of guaranteeing safe power supply.
Description
Technical Field
The application relates to the technical field of power distribution networks of power systems, in particular to an operation control method of a distribution double-transformer.
Background
The distribution network is an important component of an electric power system and consists of a distribution line and a distribution substation, the distribution network is used for distributing electric energy to electric appliances in industrial and mining enterprises, cities and rural areas, loss caused by operation of the distribution network accounts for half of loss of all electric power system loss, transformers are widely distributed in the distribution network, and the load loss of the electric power system is large due to long operation time and large energy consumption of the transformers.
Disclosure of Invention
In view of the above, it is necessary to provide a method for controlling the operation of a distribution double transformer capable of reducing the load loss of an electric power system.
A method of controlling operation of a distribution double transformer, the method comprising:
acquiring current and voltage information of a first distribution transformer and a second distribution transformer in the current time period;
determining load coefficients corresponding to the first distribution transformer and the second distribution transformer in the current time period according to current and voltage information of the first distribution transformer and the second distribution transformer respectively;
under the condition that the load coefficients corresponding to the first distribution transformer and the second distribution transformer are both smaller than a preset loss boundary point load coefficient and the current operation mode is not the wheel-stop operation mode, controlling the first distribution transformer and the second distribution transformer to be switched to the wheel-stop operation mode for operation;
and under the condition that the load coefficients corresponding to the first distribution transformer and the second distribution transformer are both larger than the preset load coefficient of the loss junction point and the current operation mode is not the operation in the split operation mode, controlling the first distribution transformer and the second distribution transformer to be switched to the operation in the split operation mode.
In one embodiment, the predetermined load factor of the loss boundary point is calculated by the following formula:
wherein the content of the first and second substances,
the load factor of the preset loss juncture is the juncture load factor of the split operation mode and the wheel-off operation mode;
for the best economic load factor.
In one embodiment, the optimal economic load factor is calculated by the following formula:
wherein the content of the first and second substances,P OZ in order to reduce the no-load loss of the distribution transformer,P KZ in order to distribute the short-circuit loss of the transformer,K T setting the load fluctuation loss factor for the load fluctuation loss factorK T Is 1.
In one embodiment, the determining the load factors corresponding to the first distribution transformer and the second distribution transformer according to the current and voltage information of the first distribution transformer and the second distribution transformer respectively includes:
determining apparent power corresponding to the first distribution transformer and the second distribution transformer according to current and voltage information of the first distribution transformer and the second distribution transformer respectively;
and analyzing through a load coefficient calculation formula according to the apparent power corresponding to the first distribution transformer and the second distribution transformer respectively to determine the load coefficients corresponding to the first distribution transformer and the second distribution transformer.
In one embodiment, the load factor calculation formula is:
wherein the content of the first and second substances,
for the load factor of the distribution transformer in the current time period,Sthe apparent power of the average output of the distribution transformer in the current time period,S N for rated apparent power of distribution transformerThe ratio of the content to the content,P 2 the average output active power of the distribution transformer in the current time period,
and the average power factor of the load side of the distribution transformer in the current time period is obtained.
According to the operation control method of the distribution double-transformer, the current voltage information of the first distribution transformer and the second distribution transformer in the current time period is collected, and then the load coefficients corresponding to the first distribution transformer and the second distribution transformer in the current time period are determined according to the current voltage information of the first distribution transformer and the second distribution transformer respectively, so that under the condition that the load coefficients corresponding to the first distribution transformer and the second distribution transformer are both smaller than the preset loss boundary point load coefficient and the current operation mode is not the wheel stop operation mode, the first distribution transformer and the second distribution transformer are controlled to be switched to the wheel stop operation mode for operation, the load coefficients corresponding to the first distribution transformer and the second distribution transformer are both larger than the preset loss boundary point load coefficient, and the current operation mode is not the row operation mode for operation, the first distribution transformer and the second distribution transformer are controlled to be switched to the row operation mode for operation, and the loss of the distribution transformer and the second distribution transformer are controlled to operate in the row operation mode, and the loss of the distribution transformer is reduced dynamically, and the load of the distribution transformer is reduced.
Drawings
FIG. 1 is a schematic flow chart diagram of a method for controlling operation of a distribution double transformer in one embodiment;
fig. 2 is a schematic diagram of a part of a power distribution room in one embodiment.
Detailed Description
In order to make the objects, technical solutions and advantages of the present application more apparent, the present application 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 present application and are not intended to limit the present application.
In one embodiment, as shown in fig. 1, an operation control method for a distribution double transformer is provided, which is described by taking the method as an example for a control device, and includes the following steps:
step S220, collecting current and voltage information of the first distribution transformer and the second distribution transformer in the current time period.
The current and voltage information of the first distribution transformer and the second distribution transformer in the current time period can be obtained by acquiring the current and voltage information of the first distribution transformer and the second distribution transformer in real time.
The current time period may be a time period between preset time intervals for analyzing the load factor, that is: the time period between the point in time when the load factor is currently being analyzed and the point in time when the load factor was last analyzed.
The current and voltage information of the first distribution transformer can be current information and voltage information of the first distribution transformer.
The current and voltage information of the second distribution transformer can be current information and voltage information of the second distribution transformer.
Step S240, determining load coefficients corresponding to the first distribution transformer and the second distribution transformer in the current time period according to the current and voltage information of the first distribution transformer and the second distribution transformer, respectively.
It should be understood that the load factor of the first distribution transformer is analyzed according to the current and voltage information of the first distribution transformer.
It should be understood that the load factor of the second distribution transformer is analyzed according to the current and voltage information of the second distribution transformer.
In one possible embodiment, determining the load factors corresponding to the first distribution transformer and the second distribution transformer according to the current and voltage information of the first distribution transformer and the second distribution transformer respectively includes:
determining apparent power corresponding to the first distribution transformer and the second distribution transformer according to current and voltage information of the first distribution transformer and the second distribution transformer respectively; and respectively analyzing through a load coefficient calculation formula according to the apparent power corresponding to the first distribution transformer and the second distribution transformer, and determining the load coefficients corresponding to the first distribution transformer and the second distribution transformer.
Wherein, the load coefficient calculation formula is as follows:
wherein, the first and the second end of the pipe are connected with each other,
for the load factor of the distribution transformer in the current time period,Sthe apparent power of the average output of the distribution transformer in the current time period,S N to the rated apparent power of the distribution transformer,P 2 the active power output by the distribution transformer in the current time period is averaged,
and the average power factor of the load side of the distribution transformer in the current time period is obtained.
And step S260, controlling the first distribution transformer and the second distribution transformer to be switched to the wheel-off operation mode to operate under the condition that the load coefficients corresponding to the first distribution transformer and the second distribution transformer are both smaller than the preset loss boundary point load coefficient and the current operation mode is not the wheel-off operation mode.
It should be understood that if the first distribution transformer and the second distribution transformer are already in the round-trip operation mode and the load coefficients corresponding to the first distribution transformer and the second distribution transformer in the current time period are both smaller than the preset load coefficient of the loss boundary point, the first distribution transformer and the second distribution transformer continue to operate in the round-trip operation mode, and if the first distribution transformer and the second distribution transformer are not in the round-trip operation mode and the load coefficients corresponding to the first distribution transformer and the second distribution transformer in the current time period are both smaller than the preset load coefficient of the loss boundary point, the first distribution transformer and the second distribution transformer are controlled to be switched to operate in the round-trip operation mode.
The schematic structural diagram of the power distribution room part shown in fig. 2 includes a first distribution transformer, a second distribution transformer, a bus coupler switch, a first high-voltage side switch, a first low-voltage side switch, a second high-voltage side switch, and a second low-voltage side switch.
The first distribution transformer is connected in series between the first high-voltage side switch and the first low-voltage side switch, the first low-voltage side switch is connected in parallel with the bus coupler switch and the first low-voltage station bus load, the second distribution transformer is connected in series between the second high-voltage side switch and the second low-voltage side switch, and the second low-voltage side switch is connected in parallel with the bus coupler switch and the second low-voltage station bus load.
The first distribution transformer and the second distribution transformer are controlled to operate in a shutdown mode, the bus coupler switch can be controlled to be closed, and a single transformer is provided with two bus loads (a first low-voltage transformer area bus load and a second low-voltage transformer area bus load).
The preset load factor of the loss junction point can be determined according to the analysis of the optimal economic load factor.
In one possible embodiment, the predetermined load factor of the loss boundary point is calculated by the following formula:
wherein the content of the first and second substances,
the load factor of the preset loss juncture is the juncture load factor of the split operation mode and the wheel-off operation mode;
is the best economic load factor.
The optimal economic load coefficient can be obtained according to the boundary load coefficient of the split operation and the economic wheel-stop mode, and the boundary load coefficient of the split operation and the economic wheel-stop mode can be obtained according to the load coefficient of the transformer.
Therefore, the load rate of the junction point of the two modes can be determined through a preset calculation formula of the load coefficient of the loss junction point, and the fixed value integral point and the operation mode in practical application can be conveniently judged.
In one possible embodiment, the optimal economic load factor is calculated as:
wherein the content of the first and second substances,P OZ in order to achieve no-load loss of the distribution transformer,P KZ in order to distribute the short-circuit loss of the transformer,K T setting the load fluctuation loss factor for the load fluctuation loss factorK T Is 1.
The no-load loss and the short-circuit loss of the distribution transformer can be obtained from nameplate rated information of the distribution transformer. The no-load loss and the short-circuit loss can be extracted from the nameplate rated information of the distribution transformer in a mode of acquiring the nameplate rated information of the distribution transformer.
The optimal economic load coefficient calculation formula can obtain the transformer load coefficient based on a distribution transformer operation loss calculation method, one special solution of the transformer load coefficient is a boundary load coefficient of a split operation mode and an economic wheel-stop mode, and the optimal economic load coefficient calculation formula is obtained by the following steps:
the loss calculation method for distribution transformer operation comprises the following steps:
ΔP Z =ΔP+K Q ΔQ≈P OZ +K T 
2 P KZ
wherein, the first and the second end of the pipe are connected with each other,ΔP Z in order to distribute the power lost by the transformer operation,P OZ in order to distribute the short-circuit loss of the transformer,P KZ in order to distribute the short-circuit loss of the transformer,
for the load factor of the transformer, the load factor,K T in order to be the load ripple loss factor,K Q in order to achieve the economic equivalent of no power,ΔPin order to have the active power loss, the power loss,ΔQis a reactive loss.
The operation loss of the distribution transformer mainly comes from no-load loss and load loss (namely, the operation loss of the distribution transformer is caused by no-load loss and load loss)K T 
2 P KZ ) The load loss is closely related to the transformer load coefficient, the load loss is larger when the load coefficient is larger, further, under the condition that the load power consumption is certain, the loss junction point under the split operation mode and the economic wheel-stop mode can be calculated, in order to qualitatively analyze and simplify the practical application, the load proportion of two distribution transformers can be set to be the same, and the load fluctuation loss coefficientK T To 1, a special solution of the transformer load factor is obtained
，Under the condition of certain load power consumption, the calculation modes of the two distribution transformer load ratios are the same and are both
A special solution of the load factor of the transformerβThe calculation formula of (a) is as follows:
wherein the content of the first and second substances,
is the loss difference between the split run module and the economy wheel-stop mode.
The load power consumption may be user power consumption and useful power.
Step S280, when the load coefficients corresponding to the first distribution transformer and the second distribution transformer are both greater than the preset load coefficient of the loss junction point, and the current operation mode is not the split operation mode, controlling the first distribution transformer and the second distribution transformer to switch to the split operation mode for operation.
It should be understood that if the first distribution transformer and the second distribution transformer are already in the split operation mode and the load coefficients corresponding to the first distribution transformer and the second distribution transformer in the current time period are both greater than the preset load coefficient of the loss boundary point, the first distribution transformer and the second distribution transformer continue to operate in the split operation mode, and if the first distribution transformer and the second distribution transformer are not in the split operation mode and the load coefficients corresponding to the first distribution transformer and the second distribution transformer in the current time period are both greater than the preset load coefficient of the loss boundary point, the first distribution transformer and the second distribution transformer are controlled to be switched to the split operation mode to operate.
The first distribution transformer and the second distribution transformer are controlled to operate in a split operation mode, the bus tie switch can be controlled to be switched off, and the first low-voltage transformer area bus load and the second low-voltage transformer area bus load operate independently.
In one possible embodiment, in the case that the load factor of one of the first distribution transformer and the second distribution transformer is greater than the preset load factor of the loss crossover point in the current time period, the current operation mode of the first distribution transformer and the second distribution transformer is not changed.
According to the operation control method of the distribution double transformers, the current voltage information of the first distribution transformer and the second distribution transformer in the current time period is collected, and then the load coefficients corresponding to the first distribution transformer and the second distribution transformer in the current time period are determined according to the current voltage information of the first distribution transformer and the second distribution transformer respectively, so that under the condition that the load coefficients corresponding to the first distribution transformer and the second distribution transformer are smaller than the preset load coefficient of the loss boundary point and the current operation mode is not the wheel stop operation mode, the first distribution transformer and the second distribution transformer are controlled to be switched to the wheel stop operation mode for operation, the load coefficients corresponding to the first distribution transformer and the second distribution transformer are larger than the preset load coefficient of the loss boundary point, and the current operation mode is not the column operation mode for operation, the first distribution transformer and the second distribution transformer are controlled to be switched to the column operation mode for operation, and therefore, the loss of the distribution transformer and the second distribution transformer are controlled to be switched to the column operation mode, and the load of the distribution transformer is reduced on the basis of the dynamic control of the distribution transformer and the loss of the distribution transformer in the current time period.
In order to more clearly embody the beneficial effects of the present application, taking a dry-type transformer with a 10kV capacity of 800kVA in GB20052-2020 power transformer energy efficiency limit and energy efficiency class as an example, the parameters and related technical parameters of the distribution transformer are shown in tables 1 and 2:
TABLE 1 parameters of distribution transformers
TABLE 2 related technical parameters of distribution transformers
Through a calculation formula of the optimal economic load coefficient, the working conditions under different load rates in two modes of the split operation and the wheel-off operation are calculated, and the working conditions are shown in the table 3:
TABLE 3 working conditions at different load rates
According to the data in table 3, the boundary load rate between the split operation mode and the wheel-off operation mode is calculated to be 28%, and the total load rate is below 28%, and the wheel-off operation mode is controlled to operate, and the total power is greater than or equal to 28% and operated in the split operation mode, so that the minimum loss is achieved.
It should be understood that, although the steps in the flowchart of fig. 1 are shown in order as indicated by the arrows, the steps are not necessarily performed in order as indicated by the arrows. The steps are not performed in the exact order shown and described, and may be performed in other orders, unless explicitly stated otherwise. Moreover, at least a portion of the steps in fig. 1 may include multiple sub-steps or multiple stages that are not necessarily performed at the same time, but may be performed at different times, and the order of performance of the sub-steps or stages is not necessarily sequential, but may be performed in turn or alternately with other steps or at least a portion of the sub-steps or stages of other steps.
The technical features of the above embodiments can be arbitrarily combined, and for the sake of brevity, all possible combinations of the technical features in the above embodiments are not described, but should be considered as the scope of the present specification as long as there is no contradiction between the combinations of the technical features.
The above examples only express several embodiments of the present application, and the description thereof is more specific and detailed, but not construed as limiting the scope of the invention. It should be noted that, for a person skilled in the art, several variations and modifications can be made without departing from the concept of the present application, which falls within the scope of protection of the present application. Therefore, the protection scope of the present patent shall be subject to the appended claims.
Claims (5)
1. A method of controlling operation of a distribution double transformer, the method comprising:
collecting current and voltage information of a first distribution transformer and a second distribution transformer in the current time period;
determining load coefficients corresponding to the first distribution transformer and the second distribution transformer in the current time period according to current and voltage information of the first distribution transformer and the second distribution transformer respectively;
under the condition that the load coefficients corresponding to the first distribution transformer and the second distribution transformer are both smaller than a preset loss boundary point load coefficient and the current operation mode is not the wheel-stop operation mode, controlling the first distribution transformer and the second distribution transformer to be switched to the wheel-stop operation mode for operation;
and under the conditions that the load coefficients corresponding to the first distribution transformer and the second distribution transformer are both larger than the preset load coefficient of the loss crossover point and the current operation mode is not the operation in the split operation mode, controlling the first distribution transformer and the second distribution transformer to be switched to the split operation mode for operation.
2. The method of claim 1, wherein the predetermined load factor at the loss crossover point is calculated by the formula:
wherein the content of the first and second substances,
is a preset load factor of the loss juncture point, and the preset load rate of the loss juncture point is in minutesThe interface load factor of the train operation and wheel-off operation modes;
for the best economic load factor.
3. The method of claim 2, wherein the optimal economic load factor is calculated by the formula:
wherein the content of the first and second substances,P OZ in order to reduce the no-load loss of the distribution transformer,P KZ in order to distribute the short-circuit loss of the transformer,K T setting the load fluctuation loss factor for the load fluctuation loss factorK T Is 1.
4. The method for controlling the operation of a distribution double transformer according to claim 1, wherein the determining the load factors corresponding to the first distribution transformer and the second distribution transformer according to the current and voltage information of the first distribution transformer and the second distribution transformer respectively comprises:
determining apparent power corresponding to the first distribution transformer and the second distribution transformer according to current and voltage information of the first distribution transformer and the second distribution transformer respectively;
and analyzing through a load coefficient calculation formula according to the apparent power corresponding to the first distribution transformer and the second distribution transformer respectively to determine the load coefficients corresponding to the first distribution transformer and the second distribution transformer.
5. The method of claim 4, wherein the load factor calculation formula is:
wherein, the first and the second end of the pipe are connected with each other,
for the load factor of the distribution transformer in the current time period,Sthe apparent power of the average output of the distribution transformer in the current time period,S N to the rated apparent power of the distribution transformer,P 2 the active power output by the distribution transformer in the current time period is averaged,
and the average power factor of the load side of the distribution transformer in the current time period is obtained.
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| CN101425687A (en) * | 2008-07-03 | 2009-05-06 | 重庆大学 | Automatic control method for transformer economic operation and standby automatic throwing integrated apparatus |
| CN102354998A (en) * | 2011-09-28 | 2012-02-15 | 东北大学 | Device and method for controlling running of transformer based on three-dimensional area chart strategy |
| CN102890450A (en) * | 2012-09-27 | 2013-01-23 | 安徽省电力公司 | On-line transformer economic operation optimization platform |
| CN114462811A (en) * | 2022-01-07 | 2022-05-10 | 西安理工大学 | Economic operation evaluation method of distribution transformer based on intelligent fusion terminal |
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- 2022-11-11 CN CN202211413064.5A patent/CN115459280B/en active Active
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101425687A (en) * | 2008-07-03 | 2009-05-06 | 重庆大学 | Automatic control method for transformer economic operation and standby automatic throwing integrated apparatus |
| CN102354998A (en) * | 2011-09-28 | 2012-02-15 | 东北大学 | Device and method for controlling running of transformer based on three-dimensional area chart strategy |
| CN102890450A (en) * | 2012-09-27 | 2013-01-23 | 安徽省电力公司 | On-line transformer economic operation optimization platform |
| CN114462811A (en) * | 2022-01-07 | 2022-05-10 | 西安理工大学 | Economic operation evaluation method of distribution transformer based on intelligent fusion terminal |
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