CN109802417B - Emergency control method and device for power grid for coping with direct current fault impact weak alternating current channel - Google Patents
Emergency control method and device for power grid for coping with direct current fault impact weak alternating current channel Download PDFInfo
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Abstract
The application provides a power grid emergency control method and device for coping with direct current fault impact weak alternating current channels, comprising the following steps: determining a total switching limit value according to total power loss after a locking fault of a plurality of direct current lines and total surplus power of a weak alternating current channel; determining an additional cutting machine quantity distribution coefficient of each direct current line according to the minimum cutting machine demand quantity of each direct current line with locking faults; and determining the additional cutting machine quantity of each direct current line according to the total cutting machine limit value and the additional cutting machine quantity distribution coefficient of each direct current line, and executing cutting machine control. The technical scheme provided by the application can give consideration to the cutting machine requirement when single direct current is blocked and the cutting machine requirement when multiple direct currents are blocked simultaneously, and has good adaptability to multiple fault scenes; the principle is simple, stable and reliable, the operability and the practicability are strong; has higher practical value and good market prospect.
Description
Technical Field
The application relates to a method in the technical field of stable control of power systems, in particular to a power grid emergency control method and device for coping with direct current faults and impacting weak alternating current channels.
Background
The current energy resource and the load center are reversely distributed, which objectively determines that the current power grid pattern has the characteristics of large power supply, large power grid, large capacity, long-distance power transmission and the like. The long-distance trans-regional direct current transmission technology has the characteristics of large transmission capacity, rapidness, controllability, effective limitation of short-circuit current and the like, overcomes the defects of the traditional alternating current transmission, and is widely developed.
Along with the intensive production of extra-high voltage direct current transmission engineering, the following typical alternating current-direct current transmission scenes exist: the power is externally supplied to the power supply system through a plurality of direct currents and a single alternating current weak communication channel, the positions of the falling points in the power supply system fed by a plurality of direct current lines are closely spaced, and when the power supply system fails seriously, the direct currents are locked simultaneously, so that great impact is brought to the power supply system. In the past, only a single direct current blocking fault scene is considered when the direct current safety control system is designed, and when a plurality of direct current simultaneous blocking faults occur, the risk that the surplus power is overlapped and transferred to an alternating current weak communication channel to cause line disconnection exists because the safety control switching quantity is insufficient.
Therefore, it is desirable to provide a method and apparatus for emergency control of a power grid to cope with dc fault impact weak ac channels to solve the above problems.
Disclosure of Invention
Aiming at the problem that in the prior art, when a plurality of direct current simultaneous locking faults occur, the safety control switching quantity is insufficient, and surplus power is overlapped and transferred to an alternating current weak communication channel to cause the risk of line disconnection, the application provides a power grid emergency control method and device for coping with direct current fault impact weak alternating current channels, fully considers the static limit constraint condition of the weak alternating current channels, ensures enough switching quantity, and solves the problem of weak alternating current channel disconnection when the plurality of direct current simultaneous locking faults are not considered in the traditional safety control switching method.
An emergency control method of a power grid for coping with direct current fault impact weak alternating current channels, comprising the following steps:
determining a total switching limit value according to total power loss after a locking fault of a plurality of direct current lines and total surplus power of a weak alternating current channel;
determining an additional cutting machine quantity distribution coefficient of each direct current line according to the minimum cutting machine demand quantity of each direct current line with locking faults;
and determining the additional cutting machine quantity of each direct current line according to the total cutting machine limit value and the additional cutting machine quantity distribution coefficient of each direct current line, and executing cutting machine control.
Further, the determining the total cut-off limit according to the total power loss after the simultaneous occurrence of the blocking fault of the multiple direct current lines and the total surplus power of the weak alternating current channels includes:
the total cutter limit is calculated as follows:
P gc_dem ＝P loss -P a_sum
wherein P is gc_dem Is the total cutting limit value; p (P) loss Total power loss after failure; p (P) a_sum Is the total surplus power of the weak ac channel.
Further, the calculation formula of the total power loss after the fault is as follows:
wherein P is dci The power is the DC running power; m is the number of direct current lines with locking faults, m is less than or equal to n, and n is the total number of direct current lines;
the total surplus power of the weak ac channel is calculated as follows:
P a_sum ＝k c ×(P st -P tie0 )
wherein k is c Is a margin coefficient; p (P) st Is the static limit of weak alternating current channel; p (P) tie0 Is the initial value of weak alternating current channel power.
Further, the determining an additional cutting machine quantity distribution coefficient of each direct current line according to the minimum cutting machine requirement quantity of each direct current line with locking fault comprises:
calculating the residual cutting quantity of each direct current circuit according to the minimum cutting machine demand quantity of each direct current circuit with locking faults;
and determining an additional cutting amount distribution coefficient of each direct current line according to the residual cutting amount of each direct current line.
Further, the calculating the remaining cutting machine quantity of each direct current line according to the minimum cutting machine requirement quantity of each direct current line with locking fault comprises the following steps:
the remaining cutting amount of each direct current line is calculated as follows:
P gc_fi ＝P gc_supi -P gc_Ai
wherein P is gc_fi Surplus cutting machine quantity is used for each direct current circuit; p (P) gc_supi The cutting machine quantity is available for the current running state; p (P) gc_Ai Minimum cutter requirements for each dc line.
Further, the determining the additional cutting machine quantity distribution coefficient of each direct current line according to the residual cutting machine quantity of each direct current line comprises:
calculating the additional cutting machine quantity distribution coefficient of each direct current line according to the following steps:
wherein m is the number of direct current lines with locking faults, m is less than or equal to n, and n is the total number of direct current lines.
Further, the determining the additional cutting machine quantity of each direct current line according to the total cutting machine limit value and the additional cutting machine quantity distribution coefficient of each direct current line, and executing cutting machine control, includes:
the additional cutting amount of each direct current line is calculated as follows:
wherein P is gc_inci Adding cutting amount for each direct current; l (L) i Distributing coefficients for the additional cutting amount; p (P) gc_dem Is the total cutting limit value; p (P) gc_Ai Is the minimum cutter demand; m is the number of direct current lines with locking faults, m is less than or equal to n, and n is the total number of direct current lines.
An emergency control device for a power grid for coping with a direct current fault impact weak alternating current channel, comprising:
the total switching module is used for determining a total switching limit value according to the total power loss after the locking fault of the multiple direct current lines and the total surplus power of the weak alternating current channels;
the distribution coefficient module is used for determining an additional cutting machine quantity distribution coefficient of each direct current line according to the minimum cutting machine requirement quantity of each direct current line with the locking fault;
and the execution module is used for determining the additional cutting machine quantity of each direct current line according to the total cutting machine limit value and the additional cutting machine quantity distribution coefficient of each direct current line and executing cutting machine control.
A power grid emergency control method for dealing with direct current fault impact weak alternating current channels comprises the following steps:
if the single direct current circuit has a locking fault, executing cutting machine control according to the minimum cutting machine demand of the direct current circuit;
if a plurality of direct current lines have a blocking failure at the same time, the method as claimed in any one of claims 1 to 7 is used for executing the cutter control.
Further, if the single dc line fails in blocking, executing the cutter control according to the minimum cutter demand of the dc line, including:
judging whether the cutting amount is abundant under the single direct current locking fault, if so, carrying out the next step, otherwise, alarming;
and calculating the minimum cutter demand quantity meeting the safety and stability requirements when a single direct current locking fault occurs.
Further, the judging whether the cutting machine quantity under the single direct current blocking fault is abundant includes: comparing the current running state available cutting machine quantity P gc_supi And DC operating power P dci ；
If P gc_supi ＜P dci If the cutting amount is insufficient, sending out an alarm prompt of insufficient cutting amount; otherwise, the cutting amount is abundant.
An emergency control device for a power grid for coping with a direct current fault impact weak alternating current channel, comprising:
the single direct current locking module is used for executing the cutting machine control according to the minimum cutting machine demand of the direct current circuit if the single direct current circuit has locking faults;
a multi-dc blocking module for performing a cutter control using the method of any one of claims 1-7 if a blocking failure occurs in a plurality of dc lines simultaneously.
Compared with the closest prior art, the technical scheme provided by the application has the following beneficial effects:
1. the technical scheme provided by the application fully considers the static stability limit constraint condition of the weak alternating current channel, ensures enough cutting amount, and solves the problem of weak alternating current channel disconnection when multiple direct currents are blocked simultaneously and faults which are not considered by the traditional safety control cutting method.
2. The technical scheme provided by the application can give consideration to the cutting machine requirement when single direct current is blocked and the cutting machine requirement when multiple direct currents are blocked simultaneously, and has good adaptability to multiple fault scenes.
3. The technical scheme provided by the application has the advantages of simple principle, stability, reliability, strong operability and practicability, and has higher practical value and good market prospect.
Drawings
FIG. 1 is a flow chart of the present application;
FIG. 2 is a flowchart of a method for emergency control of a power grid to cope with a direct current fault impacting a weak alternating current channel in an embodiment of the application;
FIG. 3 is a schematic diagram of a regional grid structure;
fig. 4 is a graph of active power of a tie line corresponding to an emergency control method after a dc fault.
Detailed Description
The application is described in further detail below with reference to the accompanying drawings. For the purpose of making the objects, technical solutions and advantages of the embodiments of the present application more apparent, the technical solutions of the embodiments of the present application will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present application, and it is apparent that the described embodiments are some embodiments of the present application, but not all embodiments of the present application. All other embodiments, which can be made by those skilled in the art based on the embodiments of the application without making any inventive effort, are intended to be within the scope of the application.
Fig. 1 is a flowchart of the present application, which is a power grid emergency control method for coping with a direct current fault impacting a weak alternating current channel, comprising:
determining a total switching limit value according to total power loss after a locking fault of a plurality of direct current lines and total surplus power of a weak alternating current channel;
determining an additional cutting machine quantity distribution coefficient of each direct current line according to the minimum cutting machine demand quantity of each direct current line with locking faults;
and determining the additional cutting machine quantity of each direct current line according to the total cutting machine limit value and the additional cutting machine quantity distribution coefficient of each direct current line, and executing cutting machine control.
As shown in fig. 2, fig. 2 is a flowchart of an emergency control method for weak ac channel disconnection in response to multiple dc faults; the method of the application comprises the following steps:
step one: constructing a power grid emergency control system for coping with direct current fault impact weak alternating current channels;
step two: calculating the static limit and the total surplus power tolerance value of the current weak alternating current channel;
step three: judging whether the cutting machine quantity is abundant or not under the single direct current locking fault according to the single direct current power and the cutting machine quantity;
step four: determining the minimum cutter demand quantity meeting the safety and stability requirements when a single direct current locking fault exists;
step five: calculating the safety control cutting machine quantity when a plurality of direct currents have locking faults at the same time;
step six: and the power grid emergency control system judges the fault information and executes the switching-off command.
In the first step, a direct current safe and stable cutter control master station is configured in a dispatching center, a safe and stable cutter control master station is configured in a plurality of outgoing direct currents, a cutter execution station is configured in a direct current near-area power plant, a measurement sub-station is configured in a weak alternating current channel, and a communication connection channel is established between each control unit.
The direct current safety and stability switching control master station acquires direct current power information and corresponding total quantity information of the switchable units sent by each direct current control master station, and receives the state and channel power information of whether the units, main transformers, serial supplements and other elements connected with the weak alternating current channel sent by the weak alternating current channel measurement slave station operate.
The direct current safety and stability cutting machine control master station receives power information of an operation unit sent by a cutting machine execution station of a power plant, monitors whether direct current of the control master station fails or not, sends failure information to the control master station, receives an additional cutting machine command sent by the master station, and sends a cutting machine command to the cutting machine execution station.
And the cutting machine executing station executes cutting machine operation according to the command sent by the main station.
In the second step, the stability limit and the total surplus power tolerance value of the current weak alternating current channel are calculated, and the method comprises the following steps:
s201, obtaining a weak alternating current channel power initial value P by a measuring substation tie0 ；
S202, considering whether elements such as a unit, a main transformer, series compensation and the like connected with a weak alternating current channel are in operation or not, performing time domain simulation by adopting an engineering calculation method that a transmitting end increases the output of the unit and a receiving end reduces the output of the unit, and calculating the stability limit P of the current weak alternating current channel st ；
S203, determining the total surplus power tolerance value P of the alternating current channel a_sum ＝k c ×(P st -P tie0 ) Wherein k is c As the margin coefficient, 0.9 is generally preferable;
in the third step, for the outgoing direct current in the area, the direct current safe and stable cutting machine control master station compares the available cutting machine quantity P in the current running state gc_supi And DC operating power P dci If P gc_supi ＜P dci Sending out an alarm prompt of insufficient cutting amount, otherwise, carrying out the next step;
in the fourth step, for the outgoing direct current in the area, according to the requirements that no power angle instability and voltage stability occur in the near area, no large-scale fan off-grid phenomenon occurs, no weak alternating current channel is separated, and the like, based on a time domain simulation method, the safe and stable cutter control master station of each direct current calculates the respective minimum cutter requirement P gc_Ai And calculates the remaining machinable amount P gc_fi ＝P gc_supi -P gc_Ai ；
In the fifth step, the safety control cutting machine quantity when a plurality of direct currents have locking faults simultaneously is calculated, and the method comprises the following steps:
s501, collecting fault information by a control master station, if m direct currents simultaneously fail (m is less than or equal to n), calculating total power loss after the fault
S502, determining the limit value P of the total cutting machine gc_dem ＝P loss -P a_sum ；
S503, calculating an additional cutting machine quantity distribution coefficient of each direct currentI.e. according to the residual cutting machine quantity P of each direct current gc_fi Is allocated according to the proportion of the number of the parts;
s504, calculating the additional cutting amount of each direct current
In the sixth step, the emergency control system of the power grid judges fault information and executes a switching command, and the method comprises the following steps:
s601, a direct current safety and stability cutter control main station monitors whether the direct current has a locking fault, if so, the cutter control main station monitors the direct current according to the minimum cutter demand P gc_Ai Executing a switching command and sending fault information to a direct-current safe and stable switching control master station;
s602, the direct current safety and stability cutter control master station receives direct current fault information sent by the direct current safety and stability cutter control master station, and when a plurality of direct current simultaneous locking faults are monitored, the direct current safety and stability cutter control master station sends cutting additional cutter quantity P to each relevant direct current safety and stability cutter control master station gc_inci Is a command of (2);
s603, the direct current safe and stable cutting machine control master station receives the cutting additional cutting machine quantity P sent by the direct current safe and stable cutting machine control master station gc_inci The command is implemented to ensure the safe and stable operation of the weak alternating current channel and the system.
According to the method, an example of an actual regional power grid A is further described. The regional power grid network structure schematic diagram is shown in fig. 3.
In a typical operation mode of the regional power grid A, the regional power grid A is connected with the regional power grid B through a single-circuit extra-high voltage alternating current connecting line, direct current 1 and direct current 2 simultaneously transmit power to the region C, and direct current 3, direct current 4 and direct current 5 receive power from an external regional power grid. The ac/dc power in the typical mode of operation is shown in table 1. And only considering the static limit of the alternating current channel to determine, and controlling the calculation process of the switching quantity under the scene of simultaneous faults of two outgoing direct currents.
Table 1 typical mode of operation
The emergency control method for weak alternating current channel disconnection under the condition of coping with multiple direct current faults, provided by the application, comprises the following steps:
in the first step, a power grid emergency control system for coping with direct current fault impact weak alternating current channels is constructed, a direct current safety and stability switching control master station is configured in a dispatching center, respective safety and stability switching control master stations are respectively configured in direct current 1 and direct current 2, switching execution stations are configured in power plants in the near areas of the direct current 1 and the direct current 2, measurement substations are configured in the weak alternating current channels, and communication channels are established among the control units.
In the second step, the stability limit and the total surplus power tolerance value of the current weak alternating current channel are calculated, and the method comprises the following steps:
s201, obtaining a weak alternating current channel power initial value P by a measuring substation tie0 ＝5000MW；
S202, considering that a unit connected near a weak alternating current channel is not put into operation, 2 main transformers of an extra-high voltage station are respectively put into operation, and two sides of the extra-high voltage station are connected in series and supplemented, performing time domain simulation by adopting an engineering calculation method for increasing the output of a system A unit and reducing the output of a system B unit, and calculating to obtain the stability limit P of the current weak alternating current channel st ＝7000MW；
S203, determining the total surplus power P of the alternating current channel a_sum ＝k c ×(P st -P tie0 )＝0.9×(7000-5000)＝1800MW；
In the third step, for 2 outgoing direct currents in the area, the direct current safe and stable cutting machine control main station compares the available cutting machine quantity P in the current running state gc_supi Relationship with dc operating power;
direct current 1:
P gc_sup1 ＝5080MW＞P dc1 ＝5000MW
direct current 2:
P gc_sup2 ＝8600MW＞P dc2 ＝7500MW
the available cutting machine quantity of the two direct currents is larger than the direct current power, and the next step can be carried out;
in the fourth step, for 2 direct currents in the positive direction in the region, according to the requirements that no power angle instability and voltage stability occur in the near region, no large-scale fan off-grid phenomenon occurs, no weak alternating current channels are separated and the like, the method is calculated based on a time domain simulation method, and the method is used for obtaining the direct current through calculation:
direct current 1:
minimum cutter requirement P gc_A1 ＝3180MW；
Residual cutting machine quantity P gc_f1 ＝P gc_sup1 -P gc_A1 ＝5080-3180＝1900MW；
Direct current 2:
minimum cutter requirement P gc_A2 ＝4640MW；
Residual cutting machine quantity P gc_f2 ＝P gc_sup2 -P gc_A2 ＝8600-4640＝3960MW；
In the fifth step, a scheme of the safety control cutting machine when a plurality of same-receiving-end direct currents are simultaneously locked is calculated, and the method comprises the following steps:
s501, collecting fault information by a control master station, if 2 direct currents simultaneously fail, calculating total power loss after the failure
S502, determining the limit value P of the total cutting machine gc_dem ＝P loss -P a_sum ＝12500-1800＝10700MW；
S503, calculating an additional cutting machine quantity distribution coefficient L of each direct current i
Direct current 1:
direct current 2:
S504. calculating the additional cutting machine quantity P of each direct current gc_inci ；
Direct current 1:
direct current 2:
in the sixth step, the control system judges the fault information and executes the cutting command, and the method comprises the following steps:
s601, the direct current 1 and the direct current 2 control master stations monitor whether the direct current of the master stations generates locking faults or not, and if so, the master stations control the master stations to generate the locking faults according to the respective minimum cutting machine demand quantity P gc_A1 ＝3180MW、P gc_A2 =4640mw performs the cut command and sends fault information to the dc safe stable cut control master;
s602, the direct current safety and stability cutter control master station receives direct current fault information sent by the direct current safety and stability cutter control master station, and when 2 direct current simultaneous locking faults are monitored, the direct current safety and stability cutter control master station sends cutting additional cutter quantity P to each relevant direct current safety and stability cutter control master station gc_inc1 ＝922MW、P gc_inc2 Command =1958 MW;
s603, the direct-current safe and stable cutting machine control master station receives the additional cutting machine quantity P for cutting sent by the direct-current safe and stable cutting machine control master station gc_inc1 ＝922MW、P gc_inc2 The implementation of 1958MW command ensures safe and stable operation of weak ac channels and systems.
The active power curve of the tie line corresponding to the emergency control method after the direct current fault is shown in fig. 4.
It will be appreciated by those skilled in the art that embodiments of the present application may be provided as a method, system, or computer program product. Accordingly, the present application may take the form of an entirely hardware embodiment, an entirely software embodiment or an embodiment combining software and hardware aspects. Furthermore, the present application may take the form of a computer program product embodied on one or more computer-usable storage media (including, but not limited to, disk storage, CD-ROM, optical storage, and the like) having computer-usable program code embodied therein.
The present application is described with reference to flowchart illustrations and/or block diagrams of methods, apparatus (systems) and computer program products according to embodiments of the application. It will be understood that each flow and/or block of the flowchart illustrations and/or block diagrams, and combinations of flows and/or blocks in the flowchart illustrations and/or block diagrams, can be implemented by computer program instructions. These computer program instructions may be provided to a processor of a general purpose computer, special purpose computer, embedded processor, or other programmable data processing apparatus to produce a machine, such that the instructions, which execute via the processor of the computer or other programmable data processing apparatus, create means for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.
These computer program instructions may also be stored in a computer-readable memory that can direct a computer or other programmable data processing apparatus to function in a particular manner, such that the instructions stored in the computer-readable memory produce an article of manufacture including instruction means which implement the function specified in the flowchart flow or flows and/or block diagram block or blocks.
These computer program instructions may also be loaded onto a computer or other programmable data processing apparatus to cause a series of operational steps to be performed on the computer or other programmable apparatus to produce a computer implemented process such that the instructions which execute on the computer or other programmable apparatus provide steps for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.
Finally, it should be noted that: the above embodiments are only for illustrating the technical aspects of the present application and not for limiting the same, and although the present application has been described in detail with reference to the above embodiments, it should be understood by those of ordinary skill in the art that: modifications and equivalents may be made to the specific embodiments of the application without departing from the spirit and scope of the application, which is intended to be covered by the scope of the claims.
Claims (7)
1. An emergency control method of a power grid for coping with direct current fault impact weak alternating current channels is characterized by comprising the following steps:
determining a total switching limit value according to total power loss after a locking fault of a plurality of direct current lines and total surplus power of a weak alternating current channel;
the determining the total cut limit value according to the total power loss after the locking fault of the multiple direct current lines and the total surplus power of the weak alternating current channels simultaneously comprises the following steps:
the total cutter limit is calculated as follows:
P gc_dem ＝P loss -P a_sum
wherein P is gc_dem Is the total cutting limit value; p (P) loss Total power loss after failure; p (P) a_sum The total surplus power of the weak alternating current channel;
determining an additional cutting machine quantity distribution coefficient of each direct current line according to the minimum cutting machine demand quantity of each direct current line with locking faults;
the determining the additional cutting machine quantity distribution coefficient of each direct current line according to the minimum cutting machine demand quantity of each direct current line with locking fault comprises the following steps:
calculating the residual cutting quantity of each direct current circuit according to the minimum cutting machine demand quantity of each direct current circuit with locking faults;
determining an additional cutting amount distribution coefficient of each direct current line according to the residual cutting amount of each direct current line;
determining the additional cutting amount of each direct current line according to the total cutting limit value and the additional cutting amount distribution coefficient of each direct current line, and executing cutting control;
the method for determining the additional cutting machine quantity of each direct current line according to the total cutting machine limit value and the additional cutting machine quantity distribution coefficient of each direct current line and executing cutting machine control comprises the following steps:
the additional cutting amount of each direct current line is calculated as follows:
wherein P is gc_inci Adding cutting amount for each direct current line; l (L) i Distributing coefficients for the additional cutting amount; p (P) gc_dem Is the total cutting limit value; p (P) gc_Ai Is the minimum cutter demand; m is the number of direct current lines with locking faults, m is less than or equal to n, and n is the total number of direct current lines;
calculating the residual cutting machine quantity of each direct current circuit according to the minimum cutting machine demand quantity of each direct current circuit with locking faults, comprising the following steps:
the remaining cutting amount of each direct current line is calculated as follows:
P gc_fi ＝P gc_supi -P gc_Ai
wherein P is gc_fi Surplus cutting machine quantity is used for each direct current circuit; p (P) gc_supi The cutting machine quantity is available for the current running state; p (P) gc_Ai Minimum cutter demand for each direct current line;
the determining the additional cutting machine quantity distribution coefficient of each direct current line according to the residual cutting machine quantity of each direct current line comprises the following steps:
calculating the additional cutting machine quantity distribution coefficient of each direct current line according to the following steps:
wherein m is the number of direct current lines with locking faults, m is less than or equal to n, and n is the total number of direct current lines.
2. A power grid emergency control method for coping with direct current fault impact weak alternating current channel as claimed in claim 1, wherein,
the calculation formula of the total power loss after the fault is as follows:
wherein P is dci The power is the DC running power; m is the number of direct current lines with locking faults, m is less than or equal to n, and n is the total number of direct current lines;
the total surplus power of the weak ac channel is calculated as follows:
P a_sum ＝k c ×(P st -P tie0 )
wherein k is c Is a margin coefficient; p (P) st Is the static limit of weak alternating current channel; p (P) tie0 Is the initial value of weak alternating current channel power.
3. A power grid emergency control device for handling direct current fault impact weak alternating current channels, for implementing a power grid emergency control method for handling direct current fault impact weak alternating current channels according to claim 1, comprising:
the total switching module is used for determining a total switching limit value according to the total power loss after the locking fault of the multiple direct current lines and the total surplus power of the weak alternating current channels;
the distribution coefficient module is used for determining an additional cutting machine quantity distribution coefficient of each direct current line according to the minimum cutting machine requirement quantity of each direct current line with the locking fault;
and the execution module is used for determining the additional cutting machine quantity of each direct current line according to the total cutting machine limit value and the additional cutting machine quantity distribution coefficient of each direct current line and executing cutting machine control.
4. A power grid emergency control method for coping with direct current fault impact weak alternating current channels is characterized by comprising the following steps:
if the single direct current circuit has a locking fault, executing cutting machine control according to the minimum cutting machine demand of the direct current circuit;
if a plurality of direct current lines have blocking faults at the same time, the method as claimed in any one of claims 1-2 is used for executing the cutter control.
5. The method of emergency control of a power grid for coping with dc fault impact weak ac tunnel according to claim 4, wherein if a single dc line has a blocking fault, performing a cut control according to a minimum cut demand of the dc line, comprising:
judging whether the cutting amount is abundant under the single direct current locking fault, if so, carrying out the next step, otherwise, alarming;
and calculating the minimum cutter demand quantity meeting the safety and stability requirements when a single direct current locking fault occurs.
6. The method for emergency control of a power grid for coping with a direct current fault impacting a weak alternating current channel according to claim 5, wherein said determining whether the amount of switching under a single direct current blocking fault is sufficient comprises: comparing the current running state available cutting machine quantity P gc_supi And DC operating power P dci ；
If P gc_supi ＜P dci If the cutting amount is insufficient, sending out an alarm prompt of insufficient cutting amount; otherwise, the cutting amount is abundant.
7. An emergency control device for a power grid for coping with a direct current fault impact weak alternating current channel, comprising:
the single direct current locking module is used for executing the cutting machine control according to the minimum cutting machine demand of the direct current circuit if the single direct current circuit has locking faults;
a multi-dc blocking module for performing a cut-off control using the method according to any one of claims 1-2 if a blocking failure occurs in a plurality of dc lines at the same time.
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| CN112653170B (en) * | 2020-11-17 | 2023-08-18 | 中国电力科学研究院有限公司 | Direct-current locking optimization cutting method for strong-direct-weak crosslinking combined delivery system |
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