CN114583822A - Overload tripping method and device for automatic bus transfer device combined with power supply risk of power grid - Google Patents

Overload tripping method and device for automatic bus transfer device combined with power supply risk of power grid Download PDF

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CN114583822A
CN114583822A CN202210269354.0A CN202210269354A CN114583822A CN 114583822 A CN114583822 A CN 114583822A CN 202210269354 A CN202210269354 A CN 202210269354A CN 114583822 A CN114583822 A CN 114583822A
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power supply
line
load
power
tripping
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李强
张玉营
李侃
赵利萍
高峰
孟秋娟
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State Grid Yili Yihe Power Supply Co ltd
State Grid Corp of China SGCC
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State Grid Yili Yihe Power Supply Co ltd
State Grid Corp of China SGCC
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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
    • 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
    • H02H7/22—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 for distribution gear, e.g. bus-bar systems; for switching devices
    • 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
    • H02H7/266—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 involving switching on a spare supply
    • 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

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  • Emergency Management (AREA)
  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Supply And Distribution Of Alternating Current (AREA)

Abstract

The invention relates to the technical field of automatic bus transfer trip control, in particular to an overload trip method and device of an automatic bus transfer device combined with power supply risk of a power grid, which comprises the following steps: the method comprises the steps that line tripping sequencing is carried out on each power supply line by combining the importance of the power supply load of each power supply line and the power supply risk of a power supply user side to form a line tripping sequence; determining the optimal load shedding which meets the load shedding condition by combining the minimum load shedding principle and the line trip sequence; and obtaining a final cutting load circuit according to the optimal cutting load. The method includes the steps of bringing power supply risks at a user side and load factors of a power supply line into a load shedding calculation process, optimally matching load shedding quantity with total load of a transformer substation and rated values allowed by a main transformer or a line for a long time, determining optimal load shedding according to a minimum load shedding quantity principle, and accordingly obtaining a final load shedding line.

Description

Overload tripping method and device for automatic bus transfer device combined with power supply risk of power grid
Technical Field
The invention relates to the technical field of automatic bus transfer trip control, in particular to an overload trip method and device of an automatic bus transfer device in combination with power supply risks of a power grid.
Background
The spare power automatic switching device is a secondary device which is mainly arranged for improving the power supply reliability of a transformer substation, when a main power supply source of an incoming line of the transformer substation or a main transformer in the transformer substation trips, a spare power incoming line circuit breaker is switched on by the spare power automatic switching device or a sectional circuit breaker in the transformer substation is switched on, and a load of the whole substation is supplied by the spare power incoming line or another main transformer, so that the load supplied by the main power supply source is prevented from losing voltage. When the load of the transformer substation is large and the main power supply is in voltage loss, the standby main transformer or the line can be overloaded when the standby power supply supplies power to the load of the whole substation.
In order to solve the above problems, the present domestic automatic backup power switching devices all have an overload linkage switching function, that is, after the automatic backup power switching devices are operated, if the main supply equipment is overloaded, the automatic backup power switching devices cut off part of the load, but the disadvantages are as follows:
1. because the overload load shedding turns of the automatic bus transfer device are more than 2 turns, if the transformer substation has more overload trip circuits, the overload load is easily caused, and the power failure range is enlarged. For example, if a certain substation is connected with a spare power automatic switching device and is switched into 2 rounds of overload, the 1 st round of tripping is connected with 4 outgoing lines, and the 2 nd round of tripping is connected with 6 outgoing lines, when a main power supply is powered off, the spare power automatic switching device acts, spare power supply equipment is overloaded, theoretically, only 5 lines need to be cut off, but only 4 lines need to be cut off in the 1 st round, but the actual action of the device needs to cut off all the 6 lines in the 2 nd round, so that the power failure range is expanded.
2. Because the load changes in real time, the number of overload connection tangent lines cannot be accurately matched in real time along with the load fluctuation, particularly in a transformer substation with large load fluctuation.
3. In the actual power supply process of a power grid, due to different load properties, the importance of the power supply load is different, risk factors of a power supply user side are not considered in the trip calculation process of the spare power automatic switching device, and due to the fact that various different types of combinations of load size, risk height and the like exist in the actual operation of a circuit, if a machine trips according to a fixed value set in advance, the machine is obviously out of order.
Disclosure of Invention
The invention provides an overload tripping method and device of a spare power automatic switching device in combination with power supply risks of a power grid, overcomes the defects of the prior art, and can effectively solve the problems that the number of overload connected and tangent lines cannot be matched in real time along with load fluctuation, the overload is easily caused, and the power failure range is enlarged in the conventional overload tripping method.
One of the technical schemes of the invention is realized by the following measures: a method for overload tripping of a spare power automatic switching device in combination with power supply risk of a power grid comprises the following steps:
the method comprises the steps that line tripping sequencing is carried out on each power supply line by combining the importance of the power supply load of each power supply line and the power supply risk of a power supply user side to form a line tripping sequence;
and determining the optimal load shedding meeting the load shedding condition by combining the minimum load shedding principle and the line trip sequence, wherein the load shedding condition is as follows:
Px≥ΔS
wherein Px is the optimal load to be cut off, i.e. the sum of the line active power of one or more power supply lines; delta S is the set line load to be cut off;
and obtaining a final cutting load circuit according to the optimal cutting load.
The following is further optimization or/and improvement of the technical scheme of the invention:
the above-mentioned power supply load importance and the power supply risk that combines each power supply line carry out circuit tripping operation sequencing to each power supply line, form circuit tripping operation sequence, include:
acquiring basic judgment data of each power supply line, wherein the basic judgment data comprises power supply line risk factors, power supply line load factors and line active power;
obtaining tripping sequencing data of each power supply circuit by combining the basic judgment data, sequencing the tripping sequencing data from large to small, and determining a circuit tripping sequence;
Mn＝Pn×fn×hn
wherein Mn is tripping sequencing data; pn is the line active power; fn is a power supply line risk factor; hn is a load factor of a power supply line; n 1.. times X, X is the total number of power supply lines.
The above-mentioned basic judgement data who obtains each power supply line includes:
grading each power supply line according to the importance of power supply, and determining a risk factor of each grade of power supply line;
grading each power supply circuit according to the power supply load, and determining the load factor of each grade of power supply circuit;
obtaining the current value of each power supply line, and determining the active power of each line by using the following formula:
Figure BDA0003553961460000021
the method further includes, after determining the optimal load shedding, generating instruction information for shedding the power supply line by using binary conversion, and specifically includes:
bit marking is carried out on each power supply line to form a first virtual sequence order;
converting the line trip sequence into a second virtual sequence order by combining bit mark information of each power supply line;
according to the finally removed load circuit, inquiring corresponding bit marking information in the second virtual sequence order;
according to the inquired bit marking information, marking the bit corresponding to the first virtual ordinal sequence with 1, and setting the rest with 0;
and combining the binary conversion to generate instruction information for cutting off the power supply line.
The line load to be cut off is determined by the total load of the transformer substation and the rated value of the main transformer or the long-term allowable line.
The second technical scheme of the invention is realized by the following measures: a spare power automatic switching device overload tripping device combining power supply risks of a power grid comprises:
the sequencing processing unit is used for sequencing the line tripping of each power supply line by combining the importance of the power supply load of each power supply line and the power supply risk of a power supply user side to form a line tripping sequence;
and determining the optimal load shedding meeting the load shedding condition by combining the minimum load shedding principle and the line trip sequence, wherein the load shedding condition is as follows:
Px≥ΔS
wherein Px is the optimal load to be cut off, i.e. the sum of the line active power of one or more power supply lines; delta S is the set line load to be cut off;
and the tangent line selection unit obtains a final cut load line according to the optimal cut load.
The method and the device bring the power supply risk of the user side and the load factor of the power supply line into the load shedding calculation process, optimally match the load shedding amount with the total load of the transformer substation and the rated value allowed by the main transformer or the line for a long time, determine the optimal load shedding according to the minimum load shedding principle, thereby obtaining the final load shedding line, accurately shed the load line based on the principle of how much the overload is shed, avoid over-shedding load, effectively avoid enlarging the power failure range, and reduce the power supply loss and the social influence to the maximum extent.
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 schematic diagram of the structure of the device 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 method for overload tripping of a backup power automatic switching device in combination with a power supply risk of a power grid, including:
step S101, carrying out line tripping sequencing on each power supply line by combining the importance of the power supply load of each power supply line and the power supply risk of a power supply user side to form a line tripping sequence;
in this step, a line trip sequence is formed, comprising:
1. acquiring basic judgment data of each power supply line, wherein the basic judgment data comprise a power supply line risk factor f, a power supply line load factor h and line active power P;
here, acquiring the basic judgment data of each power supply line specifically includes:
(1) grading each power supply line according to the importance of power supply, and determining a risk factor f of each grade of power supply line; determining the risk factor f of the power supply line of each grade, wherein the risk factor f needs to meet the following risk factor setting conditions, and meanwhile, the risk factor f of the power supply line can be manually adjusted according to other factors such as different regions, seasonality and the like;
0< fn <1, and ∑ fn ═ 1, n ═ 1 … X, X being the total number of power supply lines
If the total number of the power supply lines is 16, the 16 power supply lines are divided into a special level, a first level, a second level and a third level, and the risk factor f of the special level power supply line can be set on the basis of meeting the risk factor setting conditionSpecially for treating diabetes0.05, first order supply line risk factor fI0.15, secondary line risk factor fII0.3, three stage supply line risk factor fIII＝0.5。
(2) Grading each power supply line according to the power supply load, and determining a power supply line load factor h of each grade;
the load factor h of the power supply line of each grade is determined, the load factor setting conditions shown in the specification need to be met, and meanwhile, the load factor h of the power supply line can be manually adjusted according to other factors such as different regions, seasonality and the like;
0< hn <1, and ∑ hn ═ 1, n ═ 1 … Y, Y being the total number of ranks after the ranks are divided
If the total number of the power supply lines is 16, the 16 power supply lines are divided into one type, two types, three types and four types, and one type can be divided on the basis of meeting the setting condition of the load factor: the line load is more than 15 megawatts, and the load factor h1 is 0.1; the second type is as follows: the line load is 10-15 megawatts, and the load factor h2 is 0.2; three types are as follows: the line load is 5-10 megawatts, and the load factor h3 is 0.3; four types: the load is below 5 megawatts, and the load factor h4 is 0.4.
(3) Obtaining the current value of each power supply line, and determining the active power of each line by using the following formula:
Figure BDA0003553961460000041
in order to save the AC current sampling interface of the automatic standby power switching device, each line can be only connected with the phase a current.
2. Obtaining tripping sequencing data of each power supply circuit by combining the basic judgment data, sequencing the tripping sequencing data from large to small, and determining a circuit tripping sequence;
Mn＝Pn×fn×hn
wherein Mn is tripping sequencing data; pn is the line active power; fn is a power supply line risk factor; hn is a load factor of a power supply line; n 1.. times X, X is the total number of power supply lines.
For example, if X is 16, then n is 1.. 16; therefore, when the tripping sequence data of the first power supply line is obtained, n is equal to 1, and M1 is equal to P1 xf 1 xh 1.
Step S102, determining the optimal load shedding meeting the load shedding condition by combining the minimum load shedding principle and the line tripping sequence, wherein the load shedding condition is as follows:
Px≥ΔS
wherein, Px is the optimal load for cutting off, namely the sum of the active power of one or more power supply lines; Δ S is the set line load to be cut off; the line load Δ S to be cut off is determined by the total substation load S1 and a rating S allowed by the main transformer or the line for a long time, and if S1> S, Δ S is S1-S.
And step S103, obtaining a final cutting load circuit according to the optimal cutting load. After the final load-cutting line is obtained, the corresponding power supply line is cut off.
Example 2: as shown in fig. 2, an embodiment of the present invention discloses a method for overload tripping of a backup power automatic switching device in combination with a power supply risk of a power grid, including:
step S201, determining the line current and the trip access backup power automatic switching device of the transformer substation, determining the number X of power supply lines, and marking bit of each power supply line to form a first virtual sequence B1, as shown in Table 1;
step S202, carrying out line tripping sequencing on each power supply line by combining the importance of the power supply load of each power supply line and the power supply risk of a power supply user side to form a line tripping sequence;
step S203, converting the line tripping sequence into a second virtual sequence order by combining bit marking information of each power supply line; when there are X power supply lines, if the line tripping data M1>M2>M3>M4>…>MXThen a second virtual ordinal sequence B2 is formed, as shown in table 2;
step S204, determining the optimal load shedding meeting the load shedding condition by combining the minimum load shedding principle and the line tripping sequence, wherein the load shedding condition is as follows:
Px≥ΔS
wherein Px is the optimal load to be cut off, i.e. the sum of the line active power of one or more power supply lines; delta S is the set line load to be cut off;
and S205, obtaining a final load cutting line according to the optimal load cutting, marking the bit position corresponding to the first virtual sequence order with 1 and the rest with 0 according to the inquired bit position marking information, and generating instruction information for cutting the power supply line by combining with the binary conversion. After the final load line is cut, the corresponding power supply line is cut.
In embodiment 3, it is set that the substation a has 16 10 kv line currents and trip access backup power automatic switching devices in total, the 16 lines are L1 to L16, the currents are I1 to I16, and the trips are T1 to T16, the 16 line trip access device units conform to the 16-system, and a specific overload trip method is as follows:
1. determining the line current and the tripping access backup power automatic switching device of the transformer substation, determining the number of power supply lines to be 16, and performing bit marking on each power supply line to form a first virtual sequence B1, wherein the first virtual sequence B1 is shown in Table 3;
2. and (2) carrying out line tripping sequencing on each power supply line by combining the importance of the power supply load of each power supply line and the power supply risk of a power supply user side to form a line tripping sequence, which is as follows:
[M1,M2,M3,M4,M5,M6,M7,M8,M9,M10,M11,M12,M13,M14,M15,M16]；
3. converting the line trip sequence into a second virtual sequence B2 in combination with the bit flag information of each power supply line, as shown in Table 4;
4. and determining the optimal load shedding meeting the load shedding condition by combining the minimum load shedding principle and the line tripping sequence, wherein the load shedding condition is as follows:
Px≥ΔS
wherein Px is the optimal load to be cut off, i.e. the sum of the line active power of one or more power supply lines; delta S is the set line load to be cut off;
5. according to the optimal load shedding, the final load shedding circuit required by the automatic matching from bit0 to bit16 can be obtained, so as shown in table 5, the bit position mark corresponding to the first virtual sequence order is set to 1, and the rest are set to 0, and the instruction information 01FFH for shedding the power supply circuit is generated by combining the binary conversion. After the final load line is cut, the corresponding power supply line is cut.
Embodiment 4, as shown in fig. 3, an embodiment of the present invention discloses an overload trip apparatus of a backup power automatic switching device in combination with a power supply risk of a power grid, including:
the sequencing processing unit is used for sequencing the line tripping of each power supply line by combining the importance of the power supply load of each power supply line and the power supply risk of a power supply user side to form a line tripping sequence;
and the load shedding selection unit is used for determining the optimal shedding load meeting the load shedding condition by combining the minimum load shedding principle and the line tripping sequence, wherein the load shedding condition is as follows:
Px≥ΔS
wherein Px is the optimal load to be cut off, i.e. the sum of the line active power of one or more power supply lines; Δ S is the set line load to be cut off;
and the tangent line selection unit obtains a final cut load line according to the optimal cut load.
The embodiment of the invention discloses an overload tripping method of a spare power automatic switching device combined with power supply risks of a power grid, which includes the power supply risks at a user side and load factors of a power supply line into a load shedding calculation process, optimally matches the load shedding amount with total loads of a transformer substation and rated values allowed by a main transformer or a line for a long time, determines the optimal load shedding according to the minimum load shedding principle, thereby obtaining a final load shedding line, precisely cuts the load shedding line based on the principle of how much overload is cut, avoids the over-cut load, effectively avoids enlarging the power failure range, and reduces the power supply loss and the social influence to the maximum extent.
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.
TABLE 1
Figure BDA0003553961460000071
TABLE 2
Figure BDA0003553961460000072
TABLE 3
Figure BDA0003553961460000073
TABLE 4
Figure BDA0003553961460000074
TABLE 5
Figure BDA0003553961460000075

Claims (7)

1. A method for overload tripping of a spare power automatic switching device in combination with power supply risk of a power grid is characterized by comprising the following steps:
the method comprises the steps that line tripping sequencing is carried out on each power supply line by combining the importance of the power supply load of each power supply line and the power supply risk of a power supply user side to form a line tripping sequence;
and determining the optimal load shedding meeting the load shedding condition by combining the minimum load shedding principle and the line trip sequence, wherein the load shedding condition is as follows:
Px≥ΔS
wherein Px is the optimal load to be cut off, i.e. the sum of the line active power of one or more power supply lines; delta S is the set line load to be cut off;
and obtaining a final cutting load circuit according to the optimal cutting load.
2. The method for overload tripping of the automatic backup power switching device in combination with the power supply risk of the power grid as claimed in claim 1, wherein the method for performing line tripping sequencing on the power supply lines in combination with the power supply load importance and the power supply risk of each power supply line to form a line tripping sequence comprises:
acquiring basic judgment data of each power supply line, wherein the basic judgment data comprises power supply line risk factors, power supply line load factors and line active power;
obtaining tripping sequencing data of each power supply circuit by combining the basic judgment data, sequencing the tripping sequencing data from large to small, and determining a circuit tripping sequence;
Mn＝Pn×fn×hn
wherein Mn is tripping sequencing data; pn is the line active power; fn is a power supply line risk factor; hn is a load factor of a power supply line; n 1.. times X, X is the total number of power supply lines.
3. The method for overload tripping of the spare power automatic switching device according to claim 2 and in combination with the power supply risk of the power grid, wherein the step of obtaining the basic judgment data of each power supply line comprises the following steps:
grading each power supply line according to the importance of power supply, and determining a risk factor of each grade of power supply line;
grading each power supply line according to the size of the power supply load, and determining the load factor of each grade of the power supply line;
obtaining the current value of each power supply line, and determining the active power of each line by using the following formula:
Figure FDA0003553961450000011
4. the automatic power switching device overload tripping method in combination with the power grid power supply risk according to claim 1, 2 or 3, further comprising generating instruction information for cutting off a power supply line by using a binary conversion after determining an optimal load cutting off, specifically comprising:
bit marking is carried out on each power supply line to form a first virtual sequence order;
converting the line trip sequence into a second virtual sequence order by combining bit mark information of each power supply line;
according to the finally removed load circuit, inquiring corresponding bit marking information in the second virtual sequence order;
according to the inquired bit marking information, marking the bit corresponding to the first virtual ordinal sequence with 1, and setting the rest with 0;
and combining the binary conversion to generate instruction information for cutting off the power supply line.
5. The method for tripping the automatic power switching device with overload combined with the power supply risk of the power grid as recited in claim 1, 2 or 3, wherein the line load to be cut off is determined by the total load of a transformer substation and the rated value of a main transformer or a long-term allowable line.
6. The automatic power switching device overload trip method in combination with the power grid supply risk according to claim 4, wherein the line load to be cut off is determined by a total load of a substation and a rating value allowed by a main transformer or a line for a long time.
7. A spare power automatic switching device overload trip device combining power supply risks of a power grid, which uses the spare power automatic switching device overload trip method combining power supply risks of the power grid according to any one of claims 1 to 7, and is characterized by comprising the following steps:
the sequencing processing unit is used for sequencing the line tripping of each power supply line by combining the importance of the power supply load of each power supply line and the power supply risk of a power supply user side to form a line tripping sequence;
and determining the optimal load shedding meeting the load shedding condition by combining the minimum load shedding principle and the line trip sequence, wherein the load shedding condition is as follows:
Px≥ΔS
wherein Px is the optimal load to be cut off, i.e. the sum of the line active power of one or more power supply lines; delta S is the set line load to be cut off;
and the tangent line selection unit obtains a final cut load line according to the optimal cut load.
CN202210269354.0A 2022-03-18 2022-03-18 Overload tripping method and device for automatic bus transfer device combined with power supply risk of power grid Pending CN114583822A (en)

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CN104466970A (en) * 2014-12-22 2015-03-25 国家电网公司 Spare power automatic switching dynamic intertripping control method, device and system
CN104836333A (en) * 2015-05-13 2015-08-12 国家电网公司 Backup automatic switching apparatus monitoring method and apparatus
CN106787131A (en) * 2016-12-21 2017-05-31 贵州电网有限责任公司遵义供电局 A kind of two rank region spare power automatic switching system and prepared auto restart control method
CN109217454A (en) * 2018-08-09 2019-01-15 国网浙江省电力有限公司温州供电公司 A kind of power grid backup auto-activating device distant place automatic start-stop method
CN109347209A (en) * 2018-11-28 2019-02-15 广东电网有限责任公司 A kind of substation's duty control method, control main website and system
CN111064198A (en) * 2019-12-31 2020-04-24 南京因泰莱电器股份有限公司 Rapid load regulation and control method for multi-loop power supply distribution network
CN111553554A (en) * 2020-03-20 2020-08-18 云南电网有限责任公司普洱供电局 Regional spare power automatic switching control system and operation risk management and control method thereof
CN111769567A (en) * 2020-07-17 2020-10-13 重庆大学 Power system line overload prevention control method based on dynamic security domain

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