CN114614558A - Self-adaptive acquisition method and device for overload fixed value of spare power automatic switching device - Google Patents
Self-adaptive acquisition method and device for overload fixed value of spare power automatic switching device Download PDFInfo
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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
- H02J9/00—Circuit arrangements for emergency or stand-by power supply, e.g. for emergency lighting
- H02J9/04—Circuit arrangements for emergency or stand-by power supply, e.g. for emergency lighting in which the distribution system is disconnected from the normal source and connected to a standby source
- H02J9/06—Circuit arrangements for emergency or stand-by power supply, e.g. for emergency lighting in which the distribution system is disconnected from the normal source and connected to a standby source with automatic change-over, e.g. UPS systems
- H02J9/062—Circuit arrangements for emergency or stand-by power supply, e.g. for emergency lighting in which the distribution system is disconnected from the normal source and connected to a standby source with automatic change-over, e.g. UPS systems for AC powered loads
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H7/00—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions
- H02H7/26—Sectionalised protection of cable or line systems, e.g. for disconnecting a section on which a short-circuit, earth fault, or arc discharge has occured
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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
- H02J9/00—Circuit arrangements for emergency or stand-by power supply, e.g. for emergency lighting
- H02J9/04—Circuit arrangements for emergency or stand-by power supply, e.g. for emergency lighting in which the distribution system is disconnected from the normal source and connected to a standby source
- H02J9/06—Circuit arrangements for emergency or stand-by power supply, e.g. for emergency lighting in which the distribution system is disconnected from the normal source and connected to a standby source with automatic change-over, e.g. UPS systems
- H02J9/068—Electronic means for switching from one power supply to another power supply, e.g. to avoid parallel connection
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Abstract
The invention relates to the technical field of automatic backup power switching, in particular to a self-adaptive acquisition method and a self-adaptive acquisition device for an overload fixed value of an automatic backup power switching device, wherein the self-adaptive acquisition method comprises the following steps: when one of the two main transformers trips, acquiring the overload capacity of the middle-voltage side and the low-voltage side of the other main transformer; judging whether the medium-voltage side load overload and the low-voltage side load overload are both smaller than zero; and responding to the switching command, the medium-voltage side spare power automatic switching device and the low-voltage side spare power automatic switching device act, and the line required to be cut on the local side is automatically matched and the switching command is sent out according to the preset load cutting sequence. According to the invention, a medium-voltage side and low-voltage side power ratio coefficient P, Q and a short-time main transformer overload capacity coefficient are introduced to obtain real-time and accurate medium-voltage side load overload and low-voltage side load overload, and through the introduction of a medium-voltage side and low-voltage side power ratio coefficient P, Q, load shedding is more optimized, the condition that the medium-voltage side and low-voltage side loads of a main transformer are uneven is effectively adapted, and the process that the load is more switched when the load ratio is high and less switched when the load ratio is lower is realized.
Description
Technical Field
The invention relates to the technical field of automatic backup power switching, in particular to a self-adaptive acquisition method and device for an overload fixed value of an automatic backup power switching device.
Background
At present, in a 110 kv substation of a power grid, a three-winding step-down double-transformer configuration is common. Under a normal operation mode, the high-voltage sides of the double main transformers run in parallel or in a split mode, the medium-voltage side and the low-voltage side run in a split mode, and a standby power supply automatic switching device (hereinafter referred to as a standby power supply automatic switching device) is switched into a segmented standby power supply automatic switching function.
If any one of the two main transformers trips due to faults, the medium-voltage bus and the low-voltage bus where the fault main transformer is located lose voltage, the medium-voltage side and low-voltage side backup automatic switching devices act to close the medium-voltage side and low-voltage side sectional circuit breakers, and the other main transformer carries a load of the whole station. In order to prevent the problem that the total station load of the other normal main transformer is overloaded after the accident main transformer trips, the spare power automatic switching devices are all provided with an overload linkage switching function. Under the function input, if the middle-low voltage side spare power automatic switching device detects that the main transformer side current exceeds a fixed value, a linkage switching command is sent out, a line which is accessed to the spare power automatic switching device in advance is tripped, and the overload of the main transformer is prevented.
For a three-winding transformer, the general power flows from the high-voltage side of a main transformer to the middle and low-voltage sides, and the capacity ratio of the high-middle low-voltage winding of the main transformer is 1: 1: at present, the overload condition of the local side is calculated according to the capacities of the medium and low voltage sides, and the following problems may occur in the calculation mode: 1. the medium or low voltage side has not yet been overloaded, but the high voltage side has actually been overloaded; 2. before overload occurs on the medium-voltage side or the low-voltage side, but the high-voltage side is overloaded in advance; therefore, the main transformer middle-voltage side and low-voltage side spare power automatic switching device cannot accurately judge the real load condition of the main transformer, and the problems that the judgment is inaccurate, the operation is refused, the safe operation of the main transformer is damaged, or the cut load is not matched with the real overload degree are easily caused.
Disclosure of Invention
The invention provides a self-adaptive obtaining method and a self-adaptive obtaining device for overload fixed values of a spare power automatic switching device, overcomes the defects of the prior art, and can effectively solve the problems that real load judgment is not accurate, action rejection is easy to cause, and safe operation of a main transformer is damaged in the existing method for analyzing overload of the spare power automatic switching device for calculating the overload condition of the spare power automatic switching device only according to the capacity of the spare power automatic switching device at the middle and low voltage sides.
One of the technical schemes of the invention is realized by the following measures: an adaptive acquisition method for overload fixed values of a spare power automatic switching device comprises the following steps:
when one of the two main transformers trips, the load overload of the middle-voltage side and the low-voltage side of the other main transformer is obtained by the following formula;
medium-voltage side load overload = [ S × N- (Pm + Pn) ] × P
Low-voltage side load overload = [ S × N- (Pm + Pn) ] × Q
Wherein S is the total capacity of a main transformer with a total station load; pm is the total power of the medium voltage sides of the two main transformers; pn is the total power of the low-voltage sides of the two main transformers; p is the ratio coefficient of the total power of the medium-voltage sides of the two main transformers; q is the ratio coefficient of the total power of the low-voltage sides of the two main transformers; n is the overload capacity coefficient of the short-time main transformer;
judging whether the medium-voltage side load overload and the low-voltage side load overload are both smaller than zero;
and responding to the switching command, the medium-voltage side spare power automatic switching device and the low-voltage side spare power automatic switching device act, and the line required to be cut on the local side is automatically matched and the switching command is sent out according to the preset load cutting sequence.
The following is further optimization or/and improvement of the technical scheme of the invention:
the determining of the total power ratio coefficient Pn on the medium-voltage side and the total power ratio coefficient Q on the low-voltage side of the two main transformers includes:
acquiring a medium-voltage side total power Pm and a low-voltage side total power Pn of two main transformers;
acquiring a medium-voltage side total power ratio coefficient Pn and a low-voltage side total power ratio coefficient Q of two main transformers by using the following formula;
P=Pm/(Pm+Pn)×100%
Q=Pn/(Pm+Pn)×100%。
the above-mentioned medium voltage side total power Pm and low voltage side total power Pn that obtains two main transformers includes:
the method comprises the steps that a medium-voltage side spare power automatic switching device and a low-voltage side spare power automatic switching device acquire real-time data of two main transformers, wherein the real-time data comprise medium-voltage side currents Iam and Ibm and low-voltage side currents Ial and Ibl;
the method comprises the steps that data sharing is established between a medium-voltage side spare power automatic switching device and a low-voltage side spare power automatic switching device;
determining the sum of the medium-voltage side power of the two main transformers as medium-voltage side total power Pm;
and determining the sum of the low-voltage side power of the two main transformers as the low-voltage side total power Pn.
The second technical scheme of the invention is realized by the following measures: an adaptive acquisition device for overload setting values of a spare power automatic switching device comprises:
the processing unit is used for acquiring the load overload of the middle-voltage side and the low-voltage side of the other main transformer by using the following formula when one of the two main transformers trips;
medium-voltage side overload = [ SB × N- (Pm + Pn) ] × P
Low-voltage side overload = [ SB × N- (Pm + Pn) ] × Q
Wherein SB is the total capacity of a main transformer with total station load; pm is the total power of the medium voltage sides of the two main transformers; pn is the total power of the low-voltage sides of the two main transformers; p is the ratio coefficient of the total power of the medium-voltage sides of the two main transformers; q is the ratio coefficient of the total power of the low-voltage sides of the two main transformers; n is the overload capacity coefficient of the short-time main transformer;
a judging unit for judging whether the medium-voltage side load overload and the low-voltage side load overload are both less than zero;
and the execution unit responds to the command, the medium-voltage side spare power automatic switching device and the low-voltage side spare power automatic switching device act, and the execution unit automatically matches the line required to be cut on the local side and sends a tripping command according to the preset load cutting sequence.
The following is further optimization or/and improvement of the technical scheme of the invention:
the above-mentioned still includes:
the first data acquisition unit is used for acquiring the total power Pm of the medium-voltage side and the total power Pn of the low-voltage side of the two main transformers;
and the second data acquisition unit determines a medium-voltage side total power ratio coefficient Pn and a low-voltage side total power ratio coefficient Q of the two main transformers.
After the single main transformer trips, a medium-voltage side power ratio coefficient P, Q and a low-voltage side power ratio coefficient P, Q and a short-time main transformer overload capacity coefficient can be introduced, real-time and accurate medium-voltage side load overload and low-voltage side load overload are obtained by combining the total capacity of the main transformer, the medium-voltage side load overload and the low-voltage side load overload are judged, the self-adaption obtaining and judgment of an overload fixed value are completed, the problem that a medium-voltage side automatic switching device and a low-voltage side automatic switching device are refused due to inaccurate judgment is solved, the load shedding is optimized by introducing the medium-voltage side power ratio coefficient P, Q, the condition that the medium-voltage load and the low-voltage load of the main transformer are uneven is effectively adapted, and the process that the load is more switched when the load ratio is high and less switched when the load ratio is low is achieved.
Drawings
FIG. 1 is a flow chart of a method of the present invention.
FIG. 2 is a flow chart of yet another method of the present invention.
FIG. 3 is a diagram of an apparatus according to the present invention.
FIG. 4 is a schematic diagram of another embodiment of the present invention.
Detailed Description
The present invention is not limited by the following examples, and specific embodiments may be determined according to the technical solutions and practical situations of the present invention.
The invention is further described with reference to the following examples and figures:
example 1: as shown in fig. 1, an embodiment of the present invention discloses a self-adaptive obtaining method for an overload setting value of a backup power automatic switching device, including:
step S101, when one transformer of two main transformers trips, the load overload of the middle-voltage side and the low-voltage side of the other main transformer is obtained by the following formula;
medium-voltage side overload = [ SB × N- (Pm + Pn) ] × P
Low-voltage side overload = [ SB × N- (Pm + Pn) ] × Q
Wherein SB is the total capacity of a main transformer with total station load; pm is the total power of the medium voltage sides of the two main transformers; pn is the total power of the low-voltage sides of the two main transformers; p is the ratio coefficient of the total power of the medium-voltage sides of the two main transformers; q is the ratio coefficient of the total power of the low-voltage sides of the two main transformers; n is the overload capacity coefficient of the short-time main transformer;
if one main transformer is tripped in the two main transformers, the spare power automatic switching at the middle and low voltage sides simultaneously acts, at the moment, the other main transformer carries the load of the whole station to execute the process, and the overload capacity coefficient of the short-time main transformer can be adjusted according to different areas and the actual conditions of the main transformers.
For example, two main transformers are provided, namely a main transformer A and a main transformer B, and the overload capacity coefficient N of the short-time main transformer is set to be 1.5.
(1) If the main transformer A, the middle and low voltage side spare power automatic switching operation is carried out, the main transformer B carries the total station load, and the formulas of calculating the load overload Dmb and Dlb of the main transformer B side are as follows:
medium-voltage side load overload Dmb = [ S × 1.5- (Pm + Pn) ] × P
Low-voltage side overload Dlb = [ S × 1.5- (Pm + Pn) ] × Q
Wherein S is the total capacity of the main transformer B; pm is the total power of the medium voltage sides of the two main transformers; pn is the total power of the low-voltage sides of the two main transformers; p is the ratio coefficient of the total power of the medium-voltage sides of the two main transformers; q is the ratio coefficient of the total power of the low-voltage sides of the two main transformers;
(2) if the main transformer B trips, the spare power automatic switching device at the middle and low voltage sides acts, and the main transformer A carries the load of the whole station. The formula for calculating the overload capacity Dma and Dla of the A side of the main transformer is as follows:
medium-voltage side load overload Dma = [ S × 1.5- (Pm + Pn) ] × P
Low-voltage side overload Dla = [ S × 1.5- (Pm + Pn) ] × Q
Wherein S is the total capacity of the main transformer A; pm is the total power of the medium voltage sides of the two main transformers; pn is the total power of the low-voltage sides of the two main transformers; p is the ratio coefficient of the total power of the medium-voltage sides of the two main transformers; q is the ratio coefficient of the total power of the low-voltage sides of the two main transformers.
Step S102, judging whether the medium-voltage side load overload and the low-voltage side load overload are both smaller than zero;
and step S103, responding to the request, the medium-voltage side spare power automatic switching device and the low-voltage side spare power automatic switching device act, automatically match the line required to be cut by the local side according to the preset load cutting sequence, and send a tripping command.
The embodiment of the invention discloses a self-adaptive acquisition method for an overload fixed value of a spare power automatic switching device, which can introduce a medium-voltage side and low-voltage side power ratio coefficient P, Q and a short-time main transformer overload capacity coefficient after a single main transformer is tripped due to faults, acquire real-time and accurate medium-voltage side load overload and low-voltage side load overload by combining the total capacity of the main transformer, judge the medium-voltage side and low-voltage side load overload, finish the self-adaptive acquisition and judgment of the overload fixed value, avoid the problem that the medium-voltage side and low-voltage side spare power automatic switching devices are refused due to inaccurate judgment, and introduce the medium-voltage side and low-voltage side power ratio coefficient P, Q to optimize the load shedding, effectively adapt to the condition that the medium-voltage and low-side loads of the main transformer are uneven, and realize the process that the load-occupying ratio is more switched and the occupied ratio is lower.
Example 2: as shown in fig. 2, an embodiment of the present invention discloses a self-adaptive obtaining method for an overload setting value of a backup power automatic switching device, including:
step S201, obtaining a total power Pm on a medium voltage side and a total power Pn on a low voltage side of two main transformers, includes:
1. the method comprises the steps that a medium-voltage side spare power automatic switching device and a low-voltage side spare power automatic switching device acquire real-time data of two main transformers, wherein the real-time data comprise medium-voltage side currents Iam and Ibm and low-voltage side currents Ial and Ibl;
2. the method comprises the steps that data sharing is established between a medium-voltage side spare power automatic switching device and a low-voltage side spare power automatic switching device;
3. determining the sum of the medium-voltage side power of the two main transformers as medium-voltage side total power Pm;
4. determining the sum of the low-voltage side power of the two main transformers as the low-voltage side total power Pn;
when the above steps 2 to 4 are executed, the medium-voltage side backup automatic switching device or the low-voltage side backup automatic switching device needs to be set in advance as a master, the corresponding low-voltage side backup automatic switching device or the medium-voltage side backup automatic switching device is a slave, and the master calculates the total power Pm of the medium-voltage side and the total power Pn of the low-voltage side.
For example, if the medium-voltage side automatic backup switching device is set as a master and the low-voltage side automatic backup switching device is set as a slave, the slave sends the collected low-voltage side current information Ial and Ibl to the master, and the master determines the sum Pm of the medium-voltage side power and the sum Pn of the low-voltage side power of the main transformers a and B.
Step S202, determining a total power ratio coefficient Pn on the medium-voltage side and a total power ratio coefficient Q on the low-voltage side of the two main transformers, including:
1. acquiring a medium-voltage side total power Pm and a low-voltage side total power Pn of two main transformers;
2. acquiring a medium-voltage side total power ratio coefficient Pn and a low-voltage side total power ratio coefficient Q of two main transformers by using the following formula;
P=Pm/(Pm+Pn)×100%
Q=Pn/(Pm+Pn)×100%。
step S203, when one of the two main transformers trips, the load overload of the middle-voltage side and the low-voltage side of the other main transformer is obtained by the following formula;
medium-voltage side overload = [ SB × N- (Pm + Pn) ] × P
Low-voltage side overload = [ SB × N- (Pm + Pn) ] × Q
Wherein SB is the total capacity of a main transformer with a total station load; pm is the total power of the medium voltage sides of the two main transformers; pn is the total power of the low-voltage sides of the two main transformers; p is the ratio coefficient of the total power of the medium-voltage sides of the two main transformers; q is the ratio coefficient of the total power of the low-voltage sides of the two main transformers; n is the overload capacity coefficient of the short-time main transformer;
step S204, judging whether the medium-voltage side load overload and the low-voltage side load overload are both smaller than zero;
in step S205, in response to the above, the medium-voltage side backup automatic switching device and the low-voltage side backup automatic switching device operate, automatically match the line to be cut on the local side according to the preset load cutting sequence, and issue a trip command.
Embodiment 3, as shown in fig. 3, an embodiment of the present invention discloses an adaptive obtaining device for an overload setting value of a backup power automatic switching device, including:
the processing unit is used for acquiring the overload quantities of the middle-voltage side and the low-voltage side of the other main transformer by utilizing the following formula when one of the two main transformers trips;
medium-voltage side load overload = [ SB × N- (Pm + Pn) ] × P
Low-voltage side overload = [ SB × N- (Pm + Pn) ] × Q
Wherein SB is the total capacity of a main transformer with a total station load; pm is the total power of the medium voltage sides of the two main transformers; pn is the total power of the low-voltage sides of the two main transformers; p is the ratio coefficient of the total power of the medium-voltage sides of the two main transformers; q is the ratio coefficient of the total power of the low-voltage sides of the two main transformers; n is the overload capacity coefficient of the short-time main transformer;
a judging unit for judging whether the medium-voltage side load overload and the low-voltage side load overload are both less than zero;
and the execution unit responds to the command, the medium-voltage side spare power automatic switching device and the low-voltage side spare power automatic switching device act, and the execution unit automatically matches the line required to be cut on the local side and sends a tripping command according to the preset load cutting sequence.
Embodiment 4, as shown in fig. 4, an embodiment of the present invention discloses an adaptive obtaining device for an overload setting value of a backup power automatic switching device, including:
the first data acquisition unit is used for acquiring the total power Pm of the medium-voltage side and the total power Pn of the low-voltage side of the two main transformers;
the second data acquisition unit determines a medium-voltage side total power ratio coefficient Pn and a low-voltage side total power ratio coefficient Q of the two main transformers;
the processing unit is used for acquiring the load overload of the middle-voltage side and the low-voltage side of the other main transformer by using the following formula when one of the two main transformers trips;
medium-voltage side overload = [ SB × N- (Pm + Pn) ] × P
Low-voltage side overload = [ SB × N- (Pm + Pn) ] × Q
Wherein SB is the total capacity of a main transformer with total station load; pm is the total power of the medium voltage sides of the two main transformers; pn is the total power of the low-voltage sides of the two main transformers; p is the ratio coefficient of the total power of the medium-voltage sides of the two main transformers; q is the ratio coefficient of the total power of the low-voltage sides of the two main transformers; n is the overload capacity coefficient of the short-time main transformer;
a judging unit for judging whether the medium-voltage side load overload and the low-voltage side load overload are both less than zero;
and the execution unit responds to the command, the medium-voltage side spare power automatic switching device and the low-voltage side spare power automatic switching device act, and the execution unit automatically matches the line required to be cut on the local side and sends a tripping command according to the preset load cutting sequence.
The above technical features constitute the best embodiment of the present invention, which has strong adaptability and best implementation effect, and unnecessary technical features can be increased or decreased according to actual needs to meet the requirements of different situations.
Claims (5)
1. An adaptive acquisition method for an overload fixed value of a spare power automatic switching device is characterized by comprising the following steps:
when one of the two main transformers trips, the load overload of the middle-voltage side and the low-voltage side of the other main transformer is obtained by the following formula;
medium-voltage side load overload = [ S × N- (Pm + Pn) ] × P
Low-voltage side load overload = [ S × N- (Pm + Pn) ] × Q
Wherein S is the total capacity of a main transformer with a total station load; pm is the total power of the medium voltage sides of the two main transformers; pn is the total power of the low-voltage sides of the two main transformers; p is the ratio coefficient of the total power of the medium-voltage sides of the two main transformers; q is the ratio coefficient of the total power of the low-voltage sides of the two main transformers; n is the overload capacity coefficient of the short-time main transformer;
judging whether the medium-voltage side load overload and the low-voltage side load overload are both smaller than zero;
and responding to the switching command, the medium-voltage side spare power automatic switching device and the low-voltage side spare power automatic switching device act, and the line required to be cut on the local side is automatically matched and the switching command is sent out according to the preset load cutting sequence.
2. The method for adaptively acquiring the overload constant value of the backup power automatic switching device according to claim 1, wherein the determining a total power ratio coefficient Pn on a medium-voltage side and a total power ratio coefficient Q on a low-voltage side of two main transformers comprises:
acquiring a medium-voltage side total power Pm and a low-voltage side total power Pn of two main transformers;
acquiring a medium-voltage side total power ratio coefficient Pn and a low-voltage side total power ratio coefficient Q of two main transformers by using the following formula;
P=Pm/(Pm+Pn)×100%
Q=Pn/(Pm+Pn)×100% 。
3. the self-adaptive obtaining method for the overload constant value of the spare power automatic switching device according to claim 2, wherein the obtaining of the total power Pm on the medium voltage side and the total power Pn on the low voltage side of the two main transformers comprises:
the method comprises the steps that a medium-voltage side spare power automatic switching device and a low-voltage side spare power automatic switching device acquire real-time data of two main transformers, wherein the real-time data comprise medium-voltage side currents Iam and Ibm and low-voltage side currents Ial and Ibl;
the method comprises the steps that data sharing is established between a medium-voltage side spare power automatic switching device and a low-voltage side spare power automatic switching device;
determining the sum of the medium-voltage side power of the two main transformers as medium-voltage side total power Pm;
and determining the sum of the low-voltage side power of the two main transformers as the low-voltage side total power Pn.
4. An adaptive acquisition device for the overload fixed value of the backup automatic switching device, wherein the attack detection device based on the rule generalization and attack reconstruction network uses the adaptive acquisition method for the overload fixed value of the backup automatic switching device according to any one of claims 1 to 3, and the method comprises the following steps:
the processing unit is used for acquiring the load overload of the middle-voltage side and the low-voltage side of the other main transformer by using the following formula when one of the two main transformers trips;
medium-voltage side overload = [ SB × N- (Pm + Pn) ] × P
Low-voltage side overload = [ SB × N- (Pm + Pn) ] × Q
Wherein SB is the total capacity of a main transformer with total station load; pm is the total power of the medium voltage sides of the two main transformers; pn is the total power of the low-voltage sides of the two main transformers; p is the ratio coefficient of the total power of the medium-voltage sides of the two main transformers; q is the ratio coefficient of the total power of the low-voltage sides of the two main transformers; n is the overload capacity coefficient of the short-time main transformer;
a judging unit for judging whether the medium-voltage side load overload and the low-voltage side load overload are both less than zero;
and the execution unit responds to the command, the medium-voltage side spare power automatic switching device and the low-voltage side spare power automatic switching device act, and the execution unit automatically matches the line required to be cut on the local side and sends a tripping command according to the preset load cutting sequence.
5. The self-adaptive obtaining method for the overload constant value of the spare power automatic switching device according to claim 4, further comprising:
the first data acquisition unit is used for acquiring the total power Pm of the medium-voltage side and the total power Pn of the low-voltage side of the two main transformers;
and the second data acquisition unit determines a medium-voltage side total power ratio coefficient Pn and a low-voltage side total power ratio coefficient Q of the two main transformers.
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