CN112865074B - Load shedding method and device for stable control device for direct current power rapid reduction and terminal equipment - Google Patents
Load shedding method and device for stable control device for direct current power rapid reduction and terminal equipment Download PDFInfo
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- CN112865074B CN112865074B CN202110033524.0A CN202110033524A CN112865074B CN 112865074 B CN112865074 B CN 112865074B CN 202110033524 A CN202110033524 A CN 202110033524A CN 112865074 B CN112865074 B CN 112865074B
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J3/00—Circuit arrangements for ac mains or ac distribution networks
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J3/00—Circuit arrangements for ac mains or ac distribution networks
- H02J3/001—Methods to deal with contingencies, e.g. abnormalities, faults or failures
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J3/00—Circuit arrangements for ac mains or ac distribution networks
- H02J3/001—Methods to deal with contingencies, e.g. abnormalities, faults or failures
- H02J3/00125—Transmission line or load transient problems, e.g. overvoltage, resonance or self-excitation of inductive loads
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J3/00—Circuit arrangements for ac mains or ac distribution networks
- H02J3/36—Arrangements for transfer of electric power between ac networks via a high-tension dc link
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J2203/00—Indexing scheme relating to details of circuit arrangements for AC mains or AC distribution networks
- H02J2203/10—Power transmission or distribution systems management focussing at grid-level, e.g. load flow analysis, node profile computation, meshed network optimisation, active network management or spinning reserve management
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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
- H02J2310/00—The network for supplying or distributing electric power characterised by its spatial reach or by the load
- H02J2310/50—The network for supplying or distributing electric power characterised by its spatial reach or by the load for selectively controlling the operation of the loads
- H02J2310/56—The network for supplying or distributing electric power characterised by its spatial reach or by the load for selectively controlling the operation of the loads characterised by the condition upon which the selective controlling is based
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
- Y02E60/60—Arrangements for transfer of electric power between AC networks or generators via a high voltage DC link [HVCD]
Abstract
The embodiment of the invention relates to a load shedding method, a load shedding device and terminal equipment of a stability control device for rapid reduction of direct current power, which are applied to an extra-high voltage multi-terminal direct current power transmission system.
Description
Technical Field
The invention relates to the technical field of direct current power transmission, in particular to a load shedding method and device for a stability control device for direct current power quick reduction and terminal equipment.
Background
High voltage direct current transmission projects are generally provided with two converter stations, namely a sub-rectifier station and an inverter station, which are also called a transmitting end and a receiving end. The rectification station and the inversion station carry out electric energy transmission through a positive electrode (pole 1) power transmission line and a negative electrode (pole 2) power transmission line. The high-voltage direct-current transmission is transmission in which a rectification station converts three-phase alternating current into direct current, and then the direct current is transmitted to an inversion station through a pole 1 and a pole 2 transmission line, and the inversion station converts the direct current into the three-phase alternating current.
For a conventional direct current transmission project, each converter station is provided with 2 converter valve sets, namely a pole 1 converter valve set and a pole 2 converter valve set. The converter valve group of the same pole of the rectifying station and the inversion station is called a valve group of one layer, for example, the valve group of the pole 1 of the rectifying station and the valve group of the pole 1 of the inversion station are the valve group of the same layer, and the valve group of the pole 2 of the rectifying station and the valve group of the pole 2 of the inversion station are the valve group of the same layer. When a certain valve bank of the rectifying station is locked, the valve banks on the same layer of the inverter station cannot operate independently and are also locked. Otherwise, when a certain valve bank of the inversion station is locked, the valve bank on the same layer of the rectification station cannot operate independently and is also locked. When the valve group on one layer is locked, the valve group on the other layer is not influenced and can continue to operate.
For the extra-high voltage direct current transmission project, each converter station is provided with 4 converter valve groups, namely a pole 1 high-voltage valve group (high valve for short), a pole 1 low-voltage valve group (low valve for short), a pole 2 high-voltage valve group and a pole 2 low-voltage valve group. The high valve group or the low valve group of the same pole of the rectifying station and the inverter station is called a layer of valve group, for example, the high valve of the rectifying station pole 1 and the high valve of the inverter station pole 1 are the same layer of valve group, and the low valve of the rectifying station pole 1 and the low valve of the inverter station pole 1 are the same layer of valve group. When a certain valve bank of the rectifying station is locked, the same layer of valve bank of the inverter station cannot operate independently and is also locked. Otherwise, when a certain valve bank of the inversion station is locked, the valve bank on the same layer of the rectification station cannot operate independently and is also locked. When one layer of converter valve group is locked, the other three layers of converter valve groups are not affected and can continue to operate.
When serious faults such as direct current fault locking, alternating current transmission channel fault interruption and the like occur in a high-voltage direct current transmission project, measures such as a generator tripping, load shedding, direct current power emergency lifting or lowering and the like are realized by adopting a safety and stability control system (a stability control device), and the safety and stability problem of a power grid is solved.
The valve group fault load shedding strategy of the current stability control device only considers the working condition of direct current power speed reduction caused by the locking of a direct current valve group. In practice, however, in addition to the dc valve block locking, a dc power rapid drop may be caused in a dc power transmission project, and a dc power rapid drop may also be caused by factors such as a ground limit current function, a sudden trip of an ac filter, or an unbalanced protection (60 EL) of a ground electrode line, but since no valve block is locked at this time, a load shedding policy and an operation condition of a stability control device adopted in the current dc power transmission project are not satisfied, the stability control device cannot correctly and reliably act to shed a load, and a great potential safety and stability hazard exists. For example: in an extra-high voltage direct current transmission project, a pole 1 high valve operates, and a pole 2 double valve operates. If the valve group of the layer 2 is locked, then the power of the valve group 1 is reduced rapidly within the time of the whole group, and the power loss is extremely large, according to the load shedding strategy of the fault stable control device of the existing direct current valve group, because only single-layer locking occurs, the triggering fault condition and the direct current power threshold condition before the fault needing to be calculated by the load shedding are not met, and because the last fault of the fault sequence is a rapid reduction fault, the rapid reduction can not trigger low power information, and the direct current power error preventing condition before the fault is not met, the load shedding strategy of the stable control device is not operated, the stable control device refuses to operate, and at the moment, the stable control device refuses to cut the relevant load, thereby causing great hidden trouble to the safe and stable operation of the direct current receiving end power grid.
Disclosure of Invention
The embodiment of the invention provides a load shedding method and device for a stability control device for direct-current power quick reduction and terminal equipment, and aims to solve the technical problem that the stability control device cannot correctly and reliably act to shed loads under the condition of direct-current power quick reduction in the traditional stability control device for direct-current power transmission.
In order to achieve the above object, the embodiments of the present invention provide the following technical solutions:
a load shedding method of a stability control device for direct current power quick reduction is applied to an extra-high voltage multi-terminal direct current transmission system and comprises the following steps:
s10, acquiring fault information of a fault of the ultra-high voltage multi-terminal direct current power transmission system, wherein the fault information comprises time of a whole set of successive sets, whether a direct current valve set is locked or not and whether direct current power is rapidly reduced or not;
s20, analyzing whether the fault information triggers a fault condition of a stability control device or not according to an operation control mode of the ultra-high voltage multi-terminal direct current transmission system, if the fault information triggers the fault condition, calculating by the stability control device according to control quantity to obtain fault data and load shedding quantity, wherein the fault data comprises total power of a front double pole of a fault, direct current power loss quantity and the number of direct current valve groups with power loss faults in a whole time group;
s30, if the fault data meet threshold conditions and error prevention conditions, the stable control device cuts loads according to the load cutting amount;
the threshold condition comprises that the total power of a bipolar before fault is greater than a fault tripping threshold value of a direct-current valve group, the direct-current power loss is greater than a direct-current fault power loss threshold setting value, and a rectifying station or an inverting station of the ultrahigh-voltage multi-terminal direct-current transmission system in a successive whole group time comprises at least 3 direct-current valve groups which have power loss faults, wherein the power loss faults are locking or power quick drop of the direct-current valve groups;
the anti-misoperation condition comprises that an inverter station of the extra-high voltage multi-terminal direct current transmission system at least comprises a direct current valve group for sending low-power information or power loss fault information to the stability control device.
Preferably, in step S20, if the operation control mode of the extra-high voltage multi-terminal dc power transmission system is a networking mode, the fault condition for triggering the stability control device is that locking or power speed reduction occurs in at least two layers of dc valve banks in the extra-high voltage multi-terminal dc power transmission system within a time of a consecutive whole group.
Preferably, in step S20, if the operation control mode of the extra-high voltage multi-terminal dc power transmission system is an islanding mode, the fault condition triggering the stability control device is that any dc valve bank in the extra-high voltage multi-terminal dc power transmission system is locked or power is rapidly reduced.
Preferably, in step S20, the steady control device calculates the load shedding amount DL by the expression: DL = K set ×(PDC_FLost–P set ) PDC _ FLost is the accumulated DC power loss over the whole set of successive times, K set The cutting machine needs a cutting coefficient, P set The basic value is needed for cutting.
Preferably, in step S30, the threshold setting value of the dc fault power loss is 900 to 1500MW.
The invention also provides a direct-current valve group fault tripping device of the stability control device, which is applied to an extra-high voltage multi-terminal direct-current power transmission system and comprises an information acquisition module, an information analysis module and an execution module;
the information acquisition module is used for acquiring fault information of a fault of the extra-high voltage multi-terminal direct current transmission system, wherein the fault information comprises the time of a whole group of successive groups, whether a direct current valve group is locked or not and whether the direct current power is rapidly reduced or not;
the information analysis module is used for analyzing whether the fault information triggers a fault condition of the stability control device or not according to the operation control mode of the ultra-high voltage multi-terminal direct current transmission system, if the fault information triggers the fault condition, the stability control device calculates according to the control quantity to obtain fault data and load shedding quantity, and the fault data comprises total power of a front double pole of a fault, direct current power loss quantity and the number of direct current valve banks with power loss faults in a continuous whole group of time;
the execution module is used for carrying out load shedding according to the load shedding quantity by the stable control device according to the condition that the fault data meets the threshold condition and the error prevention condition;
the threshold condition comprises that the total power of a bipolar before fault is greater than a fault tripping threshold value of a direct-current valve group, the direct-current power loss is greater than a direct-current fault power loss threshold setting value, and a rectifying station or an inverting station of the ultrahigh-voltage multi-terminal direct-current transmission system in a successive whole group time comprises at least 3 direct-current valve groups which have power loss faults, wherein the power loss faults are locking or power quick drop of the direct-current valve groups;
the anti-misoperation condition comprises that an inverter station of the extra-high voltage multi-terminal direct current transmission system at least comprises a direct current valve group for sending low-power information or power loss fault information to the stability control device.
Preferably, the information analysis module comprises a first trigger submodule and a second trigger submodule; the first trigger submodule is used for triggering the stability control device according to the fact that the operation control mode of the ultrahigh voltage multi-terminal direct current transmission system is a networking mode, and the fault condition of the stability control device is that at least two layers of direct current valve banks in the ultrahigh voltage multi-terminal direct current transmission system are locked or power is rapidly reduced within the time of a whole group in succession; the second trigger submodule is used for triggering the stability control device under the fault condition that any direct current valve group in the extra-high voltage multi-terminal direct current transmission system is locked or power is rapidly reduced according to the fact that the operation control mode of the extra-high voltage multi-terminal direct current transmission system is an island mode.
The invention also provides a direct-current valve bank fault tripping device of the stability control device, which is applied to an extra-high voltage multi-terminal direct-current power transmission system and comprises the direct-current valve bank fault tripping device of the stability control device.
The present invention also provides a computer-readable storage medium, which is used for storing computer instructions, and when the computer instructions are run on a computer, the computer is caused to execute the above-mentioned load shedding method for a stable control device for dc power speed reduction.
The invention also provides terminal equipment, which comprises a processor and a memory;
the memory is used for storing program codes and transmitting the program codes to the processor;
the processor is used for executing the load shedding method of the stable control device for reducing the direct current power speed according to the instruction in the program code.
According to the technical scheme, the embodiment of the invention has the following advantages: according to the load shedding method, the load shedding device and the terminal equipment for the stability control device for the rapid reduction of the direct current power, fault information of faults of an extra-high voltage multi-terminal direct current power transmission system is obtained, whether the fault information triggers fault conditions of the stability control device or not is judged according to an operation control mode of the extra-high voltage multi-terminal direct current power transmission system, whether data of the fault information meets load shedding threshold conditions and error prevention conditions of the stability control device or not is judged after the fault conditions are triggered, only if the fault data meets the threshold conditions and the error prevention conditions, the stability control device can correctly and reliably act to export, relevant loads of a receiving end area of the extra-high voltage multi-terminal direct current power transmission system are cut off, and safe and stable operation of a power grid is guaranteed. The technical problem that the stability control device of the conventional direct-current power transmission cannot correctly and reliably act to cut loads under the condition of direct-current power rapid reduction is solved, the adaptability and the reliability of the stability control function of the extra-high voltage multi-terminal direct-current power transmission system are greatly improved, and the potential safety and stability hazards of a power grid are eliminated.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to these drawings without inventive exercise.
Fig. 1 is a flowchart of steps of a load shedding method of a stability control device for dc power speed reduction according to an embodiment of the present invention.
Fig. 2 is a frame diagram of a direct-current valve group fault cutting machine device of the stability control device according to the embodiment of the invention.
Detailed Description
In order to make the objects, features and advantages of the present invention more obvious and understandable, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the embodiments described below are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
The trigger fault condition of the stability control device in the current multi-terminal direct current transmission system is as follows: the principle of N-1 is followed, that is, when any element (such as a generator, an alternating current line, a transformer, a direct current unipolar line, a direct current converter and the like) in the multi-terminal direct current transmission system in a normal operation mode (such as a direct current networking operation mode) is disconnected due to a fault, the multi-terminal direct current transmission system can keep stable operation and normal power supply, other elements are not overloaded, and the voltage and the frequency are within an allowable range. When the multi-terminal direct-current power transmission system has an N-1 fault in a normal operation mode, the stability control device does not meet the condition of triggering the fault, and the control quantity calculation logic of the stability control device cannot be triggered; the control quantity calculation logic of the stability control device is triggered only when the fault triggering condition is met by the stability control device when an N-2 fault occurs within a set time (generally called a sequential whole group time), namely when two or more elements are disconnected due to faults. Under some special operation modes, such as a direct current island operation mode, when an N-1 fault occurs in a multi-terminal direct current transmission system, a stability control device meets a trigger fault condition, and control quantity calculation logic of the stability control device is triggered. Such as: in a high-voltage direct-current transmission project, when pole fault locking or converter valve group fault locking occurs, the direct-current power of a fault pole or a fault valve group can be instantly reduced to 0 (namely, the direct-current power is rapidly reduced), the total direct-current power is rapidly reduced, if the direct-current power is rapidly reduced to a certain value, the stability of a power grid at a sending end can be seriously influenced, and a generator tripping strategy of a stability control device can act to cut off a unit of a related power plant at the direct-current sending end so as to ensure the safe and stable operation of the power grid.
There are two ways to control the cutting strategy of the device: one mode is that under the networking operation mode of the multi-terminal direct-current transmission system, according to the N-1 principle, if the multi-terminal direct-current transmission system is only locked by one layer of converter valve groups, a stability control device does not meet the triggering fault condition of the direct-current valve group fault stability control tripping strategy, and the control quantity calculation logic cannot be triggered; only when two or more converter valve groups are locked in the time of the whole group (usually set to 900 s), the stable control device can meet the triggering fault condition of the direct-current valve group fault stable control tripping strategy, and the control quantity calculation logic can be triggered. In the other mode, in an island operation mode of the multi-terminal direct-current transmission system, as long as one layer of converter valve group is locked, the stability control device meets the triggering fault condition of the direct-current valve group fault stability control tripping strategy, and the control quantity calculation logic is triggered.
The embodiment of the application provides a load shedding method and device for a stability control device for direct-current power quick reduction and terminal equipment, and aims to solve the technical problem that the stability control device cannot correctly and reliably act to shed loads under the condition of direct-current power quick reduction in the conventional stability control device switching strategy for direct-current power transmission.
The first embodiment is as follows:
fig. 1 is a flowchart of steps of a load shedding method of a stability control device for dc power speed reduction according to an embodiment of the present invention.
As shown in fig. 1, an embodiment of the present invention provides a load shedding method for a stability control device of a direct current power speed reduction, which is applied to an extra-high voltage multi-terminal direct current transmission system, and includes the following steps:
s10, acquiring fault information of a fault of the ultra-high voltage multi-terminal direct current power transmission system, wherein the fault information comprises time of a whole set of successive sets, whether a direct current valve set is locked or not and whether direct current power is rapidly reduced or not;
s20, analyzing whether fault information triggers a fault condition of a stability control device or not according to an operation control mode of the ultra-high voltage multi-terminal direct current transmission system, if the fault information triggers the fault condition, calculating according to control quantity by the stability control device to obtain fault data and load shedding quantity, wherein the fault data comprises total power of a front double pole of a fault, direct current power loss quantity and the number of direct current valve groups with power loss faults in a whole time group;
s30, if the fault data meet threshold conditions and error prevention conditions, the stable control device cuts load according to load cutting amount;
the method comprises the steps that the threshold condition comprises that before a fault, the total bipolar power is larger than a fault tripping threshold value of a direct-current valve bank, the direct-current power loss is larger than a direct-current fault power loss threshold setting value, and a rectification station or an inversion station of the ultra-high voltage multi-terminal direct-current transmission system in a successive set time comprises at least 3 direct-current valve banks which have power loss faults, wherein the power loss faults are locking or power quick drop of the direct-current valve banks;
the anti-misoperation condition comprises that an inverter station of the extra-high voltage multi-terminal direct current transmission system at least comprises a direct current valve group for sending low-power information or power loss fault information to a stability control device.
In the embodiment of the invention, the multi-terminal direct-current transmission system of 800KV and above is called an extra-high voltage multi-terminal direct-current transmission system.
In step S10 of the embodiment of the present invention, fault information of a fault occurring in the extra-high voltage multi-terminal dc power transmission system is mainly obtained, where the fault information includes that in a set time of a whole set of consecutive times, the extra-high voltage multi-terminal dc power transmission system includes several layers of dc valve sets that are locked, and whether a dc power is rapidly reduced.
It should be noted that, in the set time of the whole set, the extra-high voltage multi-terminal direct current transmission system contains one, two or more than three layers of direct current valve banks to be locked or power is rapidly reduced.
In step S20 of the embodiment of the present invention, it is mainly determined whether the fault information triggers a fault condition of the stability control device according to an operation control manner of the extra-high voltage multi-terminal dc transmission system, and if the fault condition is triggered, the stability control device can calculate the load shedding amount and the total power of the bipolar before the fault and the dc power loss amount in the set consecutive whole set of time according to the control amount.
It should be noted that the set time for the whole set of consecutive times may be 900s. If the operation control mode of the ultra-high voltage multi-terminal direct current transmission system is a networking mode, the fault condition for triggering the stability control device is that at least two layers of direct current valve banks in the ultra-high voltage multi-terminal direct current transmission system are locked or power is rapidly reduced in the time of a whole group in succession. If the operation control mode of the ultra-high voltage multi-terminal direct current transmission system is an island mode, the fault condition for triggering the stability control device is that any direct current valve bank in the ultra-high voltage multi-terminal direct current transmission system is locked or power is rapidly reduced. In this embodiment, the power rate is reduced to a DC power reduction over successive full burst times, such as to 0. In this embodiment, the dc control protection system of the extra-high voltage multi-terminal dc transmission system sends the total dc bipolar power to the stability control device, and the dc power loss is obtained by subtracting the dc power before and after the fault by the stability control device.
In step S30 of the embodiment of the present invention, the stability control device can operate and perform load shedding according to the load shedding amount only if the fault data reaches the threshold condition for starting the load shedding operation and the error prevention condition, mainly according to whether the fault data reaches the threshold condition for starting the load shedding operation and the error prevention condition.
In this embodiment, the dc fault power loss threshold setting value is preferably 900 to 1500MW. The threshold value of the direct-current valve group fault tripping machine is preferably 1500 MW-2000 MW.
In the embodiment of the invention, compared with a tripping control strategy of the conventional steady control device, the load shedding method of the steady control device for the direct-current power rapid reduction can ensure that the steady control device can accurately and reliably act to cut off relevant loads of a receiving end area when the direct-current power rapid reduction is caused by factors such as a grounding limit current function, sudden tripping of an alternating-current filter or unbalanced protection action of a grounding electrode circuit and the like and the rapid reduction amount reaches a certain threshold condition, thereby ensuring safe and stable operation of a power grid.
In the embodiment of the invention, the logic of the load shedding method of the stable control device for the direct current power speed reduction is simple and harmonic, and the direct current power loss threshold is set, so that the stable control device can be prevented from acting under the condition that the two layers of speed reduction lose low power or the condition that one layer of locking and one layer of speed reduction lose low power, thereby avoiding an exit. The direct current continuous phase change failure or direct current power speed reduction caused by 'direct current self failure or abnormality' in the safety and stability guide rule (GB 38755-2019) 4.3.4 of an extra-high voltage multi-terminal direct current power transmission system is met, and when the impact exceeds the bearing capacity of the system, stable control measures such as a generator tripping, direct current blocking and the like are allowed to be taken in the operation process. ".
According to the load shedding method of the stability control device for the rapid drop of the direct current power, provided by the invention, the fault information of the fault of the ultra-high voltage multi-terminal direct current transmission system is obtained, whether the fault information triggers the fault condition of the stability control device is judged according to the operation control mode of the ultra-high voltage multi-terminal direct current transmission system, whether the data of the fault information meets the load shedding threshold condition and the error prevention condition of the stability control device is judged after the fault condition is triggered, and only if the fault data meets the threshold condition and the error prevention condition, the stability control device can correctly and reliably act to export, so that the related loads of the receiving end area of the ultra-high voltage multi-terminal direct current transmission system are cut off, and the safe and stable operation of a power grid is ensured. The technical problem that the stability control device of the existing direct-current power transmission can not correctly and reliably act to cut load under the condition of direct-current power quick reduction is solved, the adaptability and the reliability of the stability control function of the extra-high voltage multi-terminal direct-current power transmission system are greatly improved, and the potential safety and stability hazard of a power grid is eliminated.
In one embodiment of the present invention, in step S20, the steady control device calculates the expression of the load shedding amount DL as:
DL＝K set ×(PDC_FLost –P set ) PDC _ FLost is the accumulated DC power loss over the whole set of successive times, K set For the cutting machine, the required cutting coefficient, P set The basic value is needed for cutting machine.
Example two:
fig. 2 is a frame diagram of a direct-current valve group fault cutting machine device of the stability control device according to the embodiment of the invention.
As shown in fig. 2, an embodiment of the present invention further provides a direct-current valve group fault tripping device of a stability control device, which is applied to an extra-high voltage multi-terminal direct-current power transmission system, and includes an information obtaining module 10, an information analyzing module 20, and an executing module 30;
the information acquisition module 10 is configured to acquire fault information of a fault occurring in the extra-high voltage multi-terminal direct current power transmission system, where the fault information includes a time for successively completing a group, whether a direct current valve group is locked, and whether a direct current power is rapidly reduced;
the information analysis module 20 is configured to analyze whether fault information triggers a fault condition of the stability control device according to an operation control manner of the extra-high voltage multi-terminal direct current transmission system, and if the fault information triggers the fault condition, the stability control device calculates according to a control amount to obtain fault data and a load shedding amount, where the fault data includes total power of a front bipolar electrode before a fault, a direct current power loss amount, and the number of direct current valve banks in which a power loss fault occurs in a time of a whole consecutive group;
the execution module 30 is used for switching loads according to the load switching quantity by the stable control device when the fault data meets the threshold condition and the error prevention condition;
the method comprises the steps that a fault starting condition comprises that the total bipolar power before the fault is greater than a fault tripping threshold value of a direct-current valve bank, the direct-current power loss is greater than a direct-current fault power loss threshold setting value, and a rectification station or an inversion station of the ultra-high voltage multi-terminal direct-current transmission system in a successive set time comprises at least 3 direct-current valve banks which have power loss faults, wherein the power loss faults are locking or power quick drop of the direct-current valve banks;
the anti-error condition comprises that an inverter station of the extra-high voltage multi-terminal direct-current transmission system at least comprises a direct-current valve group to send low-power information or power loss fault information to the stability control device.
In the embodiment of the present invention, the information analysis module 20 includes a first trigger submodule 21 and a second trigger submodule 22; the first trigger submodule 21 is configured to use a networking mode according to an operation control mode of the extra-high voltage multi-terminal direct current transmission system, and a fault condition for triggering the stability control device is that at least two layers of direct current valve banks in the extra-high voltage multi-terminal direct current transmission system are locked or power is rapidly reduced in a sequential whole group time; the second trigger submodule 22 is configured to trigger the stability control device when the operation control mode of the ultra-high voltage multi-terminal dc power transmission system is an islanding mode, and the fault condition of triggering the stability control device is that any one dc valve bank in the ultra-high voltage multi-terminal dc power transmission system is locked or power is rapidly reduced.
It should be noted that the modules in the second embodiment correspond to the steps in the first embodiment, and the steps in the first embodiment have been described in detail in the first embodiment, and the contents of the modules in the second embodiment are not described in detail in this second embodiment.
Example three:
the embodiment of the invention provides direct-current valve bank fault tripping equipment of a stability control device, which is applied to an extra-high voltage multi-terminal direct-current power transmission system and comprises the direct-current valve bank fault tripping device of the stability control device.
It should be noted that the apparatus in the third embodiment has been described in detail in the second embodiment, and the contents of the apparatus in the third embodiment will not be described in detail.
Example four:
the embodiment of the invention provides a computer-readable storage medium, which is used for storing computer instructions, and when the computer-readable storage medium runs on a computer, the computer is enabled to execute the load shedding method of the stable control device for reducing the direct-current power speed.
Example five:
the embodiment of the invention provides terminal equipment, which comprises a processor and a memory;
a memory for storing the program code and transmitting the program code to the processor;
and the processor is used for executing the load shedding method of the stable control device for the direct current power speed reduction according to the instructions in the program codes.
It should be noted that, the processor is configured to execute the steps in the above-mentioned embodiment of the load shedding method for the stability control device for dc power speed reduction according to the instructions in the program code. Alternatively, the processor, when executing the computer program, implements the functions of each module/unit in each system/apparatus embodiment described above.
Illustratively, a computer program may be partitioned into one or more modules/units, which are stored in a memory and executed by a processor to accomplish the present application. One or more modules/units may be a series of computer program instruction segments capable of performing certain functions, the instruction segments being used to describe the execution of the computer program in the terminal device.
The terminal device may be a desktop computer, a notebook, a palm computer, a cloud server, or other computing devices. The terminal device may include, but is not limited to, a processor, a memory. Those skilled in the art will appreciate that the terminal device is not limited and may include more or fewer components than those shown, or some components may be combined, or different components, e.g., the terminal device may also include input output devices, network access devices, buses, etc.
The Processor may be a Central Processing Unit (CPU), other general purpose Processor, a Digital Signal Processor (DSP), an Application Specific Integrated Circuit (ASIC), an off-the-shelf Programmable Gate Array (FPGA) or other Programmable logic device, discrete Gate or transistor logic, discrete hardware components, etc. A general purpose processor may be a microprocessor or the processor may be any conventional processor or the like.
The storage may be an internal storage unit of the terminal device, such as a hard disk or a memory of the terminal device. The memory may also be an external storage device of the terminal device, such as a plug-in hard disk, a Smart Media Card (SMC), a Secure Digital (SD) Card, a Flash memory Card (Flash Card), and the like provided on the terminal device. Further, the memory may also include both an internal storage unit of the terminal device and an external storage device. The memory is used for storing computer programs and other programs and data required by the terminal device. The memory may also be used to temporarily store data that has been output or is to be output.
It is clear to those skilled in the art that, for convenience and brevity of description, the specific working processes of the above-described systems, apparatuses and units may refer to the corresponding processes in the foregoing method embodiments, and are not described herein again.
In the several embodiments provided in the present application, it should be understood that the disclosed system, apparatus and method may be implemented in other manners. For example, the above-described apparatus embodiments are merely illustrative, and for example, the division of the units is only one logical division, and other divisions may be realized in practice, for example, a plurality of units or components may be combined or integrated into another system, or some features may be omitted, or not executed. In addition, the shown or discussed mutual coupling or direct coupling or communication connection may be an indirect coupling or communication connection through some interfaces, devices or units, and may be in an electrical, mechanical or other form.
The units described as separate parts may or may not be physically separate, and parts displayed as units may or may not be physical units, may be located in one position, or may be distributed on multiple network units. Some or all of the units can be selected according to actual needs to achieve the purpose of the solution of the embodiment.
In addition, functional units in the embodiments of the present invention may be integrated into one processing unit, or each unit may exist alone physically, or two or more units are integrated into one unit. The integrated unit can be realized in a form of hardware, and can also be realized in a form of a software functional unit.
The integrated unit, if implemented in the form of a software functional unit and sold or used as a stand-alone product, may be stored in a computer readable storage medium. Based on such understanding, the technical solution of the present invention may be embodied in the form of a software product, which is stored in a storage medium and includes instructions for causing a computer device (which may be a personal computer, a server, or a network device) to execute all or part of the steps of the method according to the embodiments of the present invention. And the aforementioned storage medium includes: a U-disk, a removable hard disk, a Read-Only Memory (ROM), a Random Access Memory (RAM), a magnetic disk, or an optical disk, and various media capable of storing program codes.
The above-mentioned embodiments are only used for illustrating the technical solutions of the present invention, and not for limiting the same; although the present invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; and such modifications or substitutions do not depart from the spirit and scope of the corresponding technical solutions of the embodiments of the present invention.
Claims (10)
1. A load shedding method of a stability control device for direct current power quick reduction is applied to an extra-high voltage multi-terminal direct current transmission system, and is characterized by comprising the following steps:
s10, acquiring fault information of a fault of the ultra-high voltage multi-terminal direct current power transmission system, wherein the fault information comprises time of a whole set of successive sets, whether a direct current valve set is locked or not and whether direct current power is rapidly reduced or not;
s20, analyzing whether the fault information triggers a fault condition of a stability control device or not according to an operation control mode of the ultra-high voltage multi-terminal direct current transmission system, if the fault information triggers the fault condition, calculating by the stability control device according to control quantity to obtain fault data and load shedding quantity, wherein the fault data comprises total power of a front double pole of a fault, direct current power loss quantity and the number of direct current valve groups with power loss faults in a whole time group;
s30, if the fault data meet threshold conditions and error prevention conditions, the stable control device cuts loads according to the load cutting amount;
the threshold condition comprises that the total power of a bipolar before fault is greater than a fault tripping threshold value of a direct-current valve group, the direct-current power loss is greater than a direct-current fault power loss threshold setting value, and a rectifying station or an inverting station of the ultrahigh-voltage multi-terminal direct-current transmission system in a successive whole group time comprises at least 3 direct-current valve groups which have power loss faults, wherein the power loss faults are locking or power quick drop of the direct-current valve groups;
the anti-misoperation condition comprises that an inverter station of the extra-high voltage multi-terminal direct current transmission system at least comprises a direct current valve group for sending low-power information or power loss fault information to the stability control device.
2. The load shedding method for the voltage stabilizing and controlling device of the direct current power speed reduction according to claim 1, wherein in step S20, if the operation control mode of the extra-high voltage multi-terminal direct current transmission system is a networking mode, the fault condition triggering the voltage stabilizing and controlling device is that at least two layers of direct current valve banks in the extra-high voltage multi-terminal direct current transmission system are locked or power speed reduced within a time of a whole group.
3. The load shedding method for the stability control device of the direct current power speed reduction according to claim 1, wherein in step S20, if the operation control mode of the ultra-high voltage multi-terminal direct current transmission system is an island mode, the fault condition triggering the stability control device is that any direct current valve bank in the ultra-high voltage multi-terminal direct current transmission system is locked or the power speed reduction occurs.
4. The method for load shedding of a stability control device for direct current power speed reduction according to claim 1, wherein in step S20, the stability control device calculates the load shedding quantity DL as an expression:
DL＝K set ×(PDC_FLost–P set ) PDC _ FLost is the accumulated DC power loss over the whole set of successive times, K set For the cutting machine, the required cutting coefficient, P set Base for cutting machineThe value is obtained.
5. The load shedding method for the direct current power speed-down stability control device according to claim 1, wherein in step S30, the direct current fault power loss threshold setting value is 900-1500 MW.
6. A direct-current valve group fault tripping device of a stability control device is applied to an extra-high voltage multi-terminal direct-current transmission system and is characterized by comprising an information acquisition module, an information analysis module and an execution module;
the information acquisition module is used for acquiring fault information of a fault of the extra-high voltage multi-terminal direct current transmission system, wherein the fault information comprises the time of a whole group of successive groups, whether a direct current valve group is locked or not and whether the direct current power is rapidly reduced or not;
the information analysis module is used for analyzing whether the fault information triggers a fault condition of the stability control device or not according to the operation control mode of the ultra-high voltage multi-terminal direct current transmission system, if the fault information triggers the fault condition, the stability control device calculates according to the control quantity to obtain fault data and load shedding quantity, and the fault data comprises total power of a front double pole of a fault, direct current power loss quantity and the number of direct current valve banks with power loss faults in a continuous whole group of time;
the execution module is used for switching off the load according to the load switching quantity by the stable control device when the fault data meets the threshold condition and the error prevention condition;
the threshold condition comprises that the total power of a bipolar before fault is greater than a fault tripping threshold value of a direct-current valve group, the direct-current power loss is greater than a direct-current fault power loss threshold setting value, and a rectifying station or an inverting station of the ultrahigh-voltage multi-terminal direct-current transmission system in a successive whole group time comprises at least 3 direct-current valve groups which have power loss faults, wherein the power loss faults are locking or power quick drop of the direct-current valve groups;
the anti-error condition comprises that an inverter station of the ultra-high voltage multi-terminal direct-current transmission system at least comprises a direct-current valve group to send low-power information or power loss fault information to the stability control device.
7. The direct-current valve group fault tripping device of the stability control device according to claim 6, wherein the information analysis module comprises a first triggering submodule and a second triggering submodule; the first trigger submodule is used for triggering the stability control device in a networking mode according to the operation control mode of the ultra-high voltage multi-terminal direct current transmission system, and the fault condition of the stability control device is that at least two layers of direct current valve banks in the ultra-high voltage multi-terminal direct current transmission system are locked or power is rapidly reduced in the time of a whole set of continuous operation; the second trigger submodule is used for triggering the stability control device under the fault condition that any direct current valve group in the extra-high voltage multi-terminal direct current transmission system is locked or power is rapidly reduced according to the fact that the operation control mode of the extra-high voltage multi-terminal direct current transmission system is an island mode.
8. A direct-current valve bank fault tripping device of a stability control device, which is applied to an extra-high voltage multi-terminal direct-current transmission system, and is characterized by comprising the direct-current valve bank fault tripping device of the stability control device as claimed in claim 6 or 7.
9. A computer-readable storage medium storing computer instructions which, when executed on a computer, cause the computer to perform the method of shedding loads for a regulated device of dc power ramp down of any of claims 1-5.
10. A terminal device comprising a processor and a memory;
the memory is used for storing program codes and transmitting the program codes to the processor;
the processor is used for executing the load shedding method of the steady control device for the direct current power speed reduction according to any one of claims 1 to 5 according to instructions in the program code.
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Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107994561A (en) * | 2018-01-10 | 2018-05-04 | 云南电网有限责任公司电力科学研究院 | It is a kind of based on the locking of direct current monopole surely control cut machine cut machine amount optimization method and device |
| CN108879755A (en) * | 2018-08-07 | 2018-11-23 | 国电南瑞科技股份有限公司 | The method and system of stability control device identification extra-high voltage DC transmission system power loss amount |
| CN110445119A (en) * | 2019-07-19 | 2019-11-12 | 南方电网科学研究院有限责任公司 | A kind of more direct currents collaboration stable control method, device and equipment |
| CN111313456A (en) * | 2020-03-25 | 2020-06-19 | 中国南方电网有限责任公司 | Safety and stability control method and system for multi-terminal direct current transmission system fault |
| CN112147977A (en) * | 2020-08-19 | 2020-12-29 | 中国南方电网有限责任公司 | High-fidelity transmission test method for stability control system of direct-current power transmission system |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US9450412B2 (en) * | 2010-12-22 | 2016-09-20 | General Electric Company | Method and system for control power in remote DC power systems |
-
2021
- 2021-01-11 CN CN202110033524.0A patent/CN112865074B/en active Active
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107994561A (en) * | 2018-01-10 | 2018-05-04 | 云南电网有限责任公司电力科学研究院 | It is a kind of based on the locking of direct current monopole surely control cut machine cut machine amount optimization method and device |
| CN108879755A (en) * | 2018-08-07 | 2018-11-23 | 国电南瑞科技股份有限公司 | The method and system of stability control device identification extra-high voltage DC transmission system power loss amount |
| CN110445119A (en) * | 2019-07-19 | 2019-11-12 | 南方电网科学研究院有限责任公司 | A kind of more direct currents collaboration stable control method, device and equipment |
| CN111313456A (en) * | 2020-03-25 | 2020-06-19 | 中国南方电网有限责任公司 | Safety and stability control method and system for multi-terminal direct current transmission system fault |
| CN112147977A (en) * | 2020-08-19 | 2020-12-29 | 中国南方电网有限责任公司 | High-fidelity transmission test method for stability control system of direct-current power transmission system |
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