CN112865073A - Power quick-drop fault safe and stable control system switching method, device and equipment - Google Patents
Power quick-drop fault safe and stable control system switching method, device and equipment Download PDFInfo
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- CN112865073A CN112865073A CN202110033496.2A CN202110033496A CN112865073A CN 112865073 A CN112865073 A CN 112865073A CN 202110033496 A CN202110033496 A CN 202110033496A CN 112865073 A CN112865073 A CN 112865073A
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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
- H02J3/00—Circuit arrangements for ac mains or ac distribution networks
- H02J3/38—Arrangements for parallely feeding a single network by two or more generators, converters or transformers
- H02J3/46—Controlling of the sharing of output between the generators, converters, or transformers
- H02J3/466—Scheduling the operation of the generators, e.g. connecting or disconnecting generators to meet a given demand
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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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- 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]
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- Supply And Distribution Of Alternating Current (AREA)
- Control Of Eletrric Generators (AREA)
Abstract
The embodiment of the invention relates to a safety and stability control system tripping method, a device and equipment for power quick-drop faults. The technical problem that the stability control device of the existing stability control generator tripping strategy for high-voltage direct-current power transmission cannot correctly and reliably act to perform outlet generator tripping under the working condition that direct-current power is subjected to rapid reduction is solved, the adaptability and the reliability of the stability control function of a power system are greatly improved, and the potential safety and stability hazards of a power grid are eliminated.
Description
Technical Field
The invention relates to the technical field of direct current transmission, in particular to a safety and stability control system switching method, device and equipment for power quick-drop faults.
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 banks 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 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. However, in the stability control device, the stability control device can only control if the triggering fault condition of the stability control device is met, and in the high-voltage direct-current transmission project, besides the direct-current power rapid drop caused by the locking of the direct-current valve bank, the direct-current power rapid drop can also be caused by the grounding limit current function, the sudden tripping of the alternating-current filter or the unbalanced protection action of the grounding electrode circuit and other factors, but the triggering fault condition of the stability control device is not met because the valve bank in the high-voltage direct-current transmission project is not locked at the moment, the control quantity calculation logic cannot be triggered, and the stability control device cannot accurately and reliably act to export. 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 pole 1 high valve occurs a power ramp down, then one layer of pole 2 latches for the entire set of consecutive times. According to the triggering fault condition of the existing direct-current valve group fault stable control tripping strategy, as only single-layer locking occurs and the triggering fault condition is not satisfied, the strategy is not operated, but the actual fault range exceeds one layer and the power loss amount can reach the level of taking measures, at the moment, a stable control device refuses to operate and fails to cut off the relevant power plant unit, and great hidden danger is caused to the safe and stable operation of a direct-current sending end power grid.
Disclosure of Invention
The embodiment of the invention provides a safety and stability control system tripping method, device and equipment for power quick-drop faults, and aims to solve the technical problem that a stability control device of the existing high-voltage direct-current transmission cannot correctly and reliably act an outlet tripping machine under the working condition that direct-current power is subjected to quick drop.
In order to achieve the above object, the embodiments of the present invention provide the following technical solutions:
a safety and stability control system switching method for power quick-drop faults comprises the following steps:
s10, acquiring fault information of a power system, wherein the fault information comprises time of a whole group, whether a direct-current valve group 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 safety and stability control system or not according to an operation control mode of the power system, if the fault information triggers the fault condition, calculating by the safety and stability control system according to a control quantity to obtain a machine switching quantity and fault data, wherein the fault data comprises total power of a double pole before a fault and a direct current power loss quantity in a continuous whole group of time;
s30, if the fault data meet threshold conditions, the safety and stability control system performs machine cutting according to the machine cutting amount; the threshold condition comprises that the total power of the bipolar before the fault is larger than a fault tripping threshold value of the direct-current valve group, and the direct-current power loss is larger than a direct-current fault power loss threshold setting value.
Preferably, in step S20, if the operation control mode of the power system is the networking mode, the fault condition triggering the safety and stability control system is that a lockout or a power speed drop occurs in a dc valve set including at least two layers in the power system during a time of a consecutive whole group.
Preferably, in step S20, if the operation control mode of the power system is the islanding mode, the fault condition triggering the safety and stability control system is a lockout or a power speed drop of a dc valve set at any layer in the power system.
Preferably, in step S20, the safety and stability control system calculates the expression of the cut amount DP as: DP ═ Kset×(PDC_FLost–Pset) PDC _ FLost is the accumulated DC power loss over the whole set of successive times, KsetFor the cutting machine, the required cutting coefficient, PsetThe basic value is needed for cutting machine.
Preferably, in step S30, the dc fault power loss threshold setting value is 900 to 1500 MW.
The invention also provides a power quick-drop fault safety and stability control system cutter device, which 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 power system, wherein the fault information comprises the time of the whole group, whether the 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 safety and stability control system or not according to the operation control mode of the power system, if the fault information triggers the fault condition, the safety and stability control system calculates according to the control quantity to obtain a machine switching quantity and fault data, and the fault data comprises total power of a front double pole of a fault and direct-current power loss quantity in the time of a whole group of successive groups;
the execution module is used for carrying out machine cutting according to the machine cutting quantity by the safety and stability control system according to the condition that the fault data meet the threshold condition; the threshold condition comprises that the total power of the bipolar before the fault is larger than a fault tripping threshold value of the direct-current valve group, and the direct-current power loss is larger than a direct-current fault power loss threshold setting value.
Preferably, the information analysis module comprises a first trigger submodule and a second trigger submodule; the first triggering submodule is used for triggering the safety and stability control system in a networking mode according to the operation control mode of the power system, and the fault condition of triggering the safety and stability control system is that at least two layers of direct-current valve banks in the power system are locked or power is rapidly reduced within the time of a whole group in succession; the second triggering submodule is used for triggering the safety and stability control system to be in an island mode according to the operation control mode of the power system, and the fault condition of the safety and stability control system is that a direct-current valve bank at any layer of the power system is locked or power is rapidly reduced.
The invention also provides a power quick-drop fault safety and stability control system cutter device, which comprises the power quick-drop fault safety and stability control system cutter device.
The present invention also provides a computer-readable storage medium for storing computer instructions, which when run on a computer, cause the computer to execute the safety and stability control system power shutdown method for power ramp-down fault described above.
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 safety and stability control system power-off method for the power speed reduction fault according to the instructions in the program codes.
According to the technical scheme, the embodiment of the invention has the following advantages: according to the safety and stability control system tripping method, device and equipment for the power quick-drop fault, fault information of a power system in a fault is obtained, whether fault conditions of the safety and stability control system are triggered or not is judged according to an operation control mode of the power system, whether data in the fault information meet tripping threshold conditions of the safety and stability control system or not is judged after the fault conditions are triggered, if total power of a front double pole of the fault and loss quantity of direct current power in a whole group of time in succession meet the threshold conditions, the safety and stability control system can correctly and reliably act to export, relevant units of a sending-end power plant are cut off, and safe and stable operation of a power grid is guaranteed. The technical problem that the stability control device of the existing stability control generator tripping strategy for high-voltage direct-current power transmission cannot correctly and reliably act to perform outlet generator tripping under the working condition that direct-current power is subjected to rapid reduction is solved, the adaptability and the reliability of the stability control function of a power 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 illustrating steps of a power shutdown method of a safety and stability control system for a power ramp-down fault according to an embodiment of the present invention.
Fig. 2 is a block diagram of a generator tripping device of a safety and stability control system with a power speed reduction fault according to an embodiment of the present 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 existing direct current transmission stability control device 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 a direct current transmission power system in a normal operation mode (such as a direct current networking operation mode) is disconnected in a fault, the power system can keep stable operation and normal power supply, other elements are not overloaded, and the voltage and the frequency are in an allowable range. When an N-1 fault occurs in a direct-current transmission power system in a normal operation mode, the stable control device does not meet the condition of triggering the fault, and the control quantity calculation logic of the stable 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 isolated island operation mode, when an N-1 fault occurs in a direct current transmission power system, a stable control device meets a trigger fault condition, and control quantity calculation logic of the stable 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 a direct-current transmission power system, according to the principle of N-1, if only one layer of converter valve groups of the power system is locked, a stability control device does not meet the triggering fault condition of a 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 900s), 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 a direct-current power transmission power 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 safety and stability control system tripping method, device and equipment for power quick-drop faults, and is used for solving the technical problem that a stability control device of the existing high-voltage direct-current transmission cannot correctly and reliably act an outlet tripping machine under the working condition that direct-current power is subjected to quick drop.
The first embodiment is as follows:
fig. 1 is a flowchart illustrating steps of a power shutdown method of a safety and stability control system for a power ramp-down fault according to an embodiment of the present invention.
As shown in fig. 1, an embodiment of the present invention provides a power shutdown method for a safety and stability control system with a power fast-drop fault, including the following steps:
s10, acquiring fault information of a power system in fault, wherein the fault information comprises time of a whole group, whether a direct-current valve group is locked or not and whether direct-current power is rapidly reduced or not;
s20, analyzing whether fault information triggers a fault condition of the safety and stability control system or not according to the operation control mode of the power system, if the fault information triggers the fault condition, calculating by the safety and stability control system according to control quantity to obtain machine switching quantity and fault data, wherein the fault data comprises total power of a double pole before fault and loss quantity of direct current power in a continuous whole group of time;
s30, if the fault data meet threshold conditions, the safety and stability control system performs cutting according to cutting amount; the threshold condition comprises that the total power of the bipolar electrodes before the fault is greater than a fault tripping threshold value of the direct-current valve group, and the direct-current power loss is greater than a direct-current fault power loss threshold setting value.
In step S10 of the embodiment of the present invention, fault information of a fault occurring in the power system is mainly obtained, where the fault information includes that, in the set time of a consecutive group, the power system includes several layers of dc valve banks that are locked, and whether the dc power is rapidly reduced after the fault occurs.
It should be noted that, in the set time of the whole successive group, the dc valve group in one, two or more than three layers in the power system is 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 safety and stability control system according to the operation control manner of the power system, and if the fault condition is triggered, the safety and stability control system calculates the amount of the machine switching, and the total power of the bipolar electrodes before the fault and the amount of the dc power loss in the set time of the whole set of time after the fault.
It should be noted that the set time for the entire set of consecutive times may be 900 s. If the operation control mode of the power system is a networking mode, the fault condition for triggering the safety and stability control system is that the direct-current valve banks comprising at least two layers in the power system are locked or power is rapidly reduced in the time of the whole group in succession. If the operation control mode of the power system is an island mode, the fault condition triggering the safety and stability control system is that the direct-current valve bank on any layer in the power system is locked or power is rapidly reduced. In this embodiment, the power rate is reduced to a DC power reduction over the entire successive set of times, such as to 0. In this embodiment, the dc control protection system in the dc transmission project sends the total power of the current dc bipole (pole 1 and pole 2) to the safety and stability control system, and the dc power loss is obtained by subtracting the dc power before and after the fault by the safety and stability control system.
In step S30 of the embodiment of the present invention, it is mainly determined whether the safety and stability control system starts the tripping operation according to the total power of the pre-fault bipole and the loss of the dc power.
It should be noted that the safety and stability control system performs the tripping operation according to the tripping amount only when the total power of the two poles before the fault is greater than the threshold value of the fault tripping operation of the direct-current valve bank and the direct-current power loss is greater than the threshold setting value of the direct-current fault power loss. In this embodiment, the dc fault power loss threshold setting value is preferably 900 to 1500 MW. 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 generator tripping control strategy of the existing safety and stability control system, the generator tripping method of the safety and stability control system for the power quick-drop fault can ensure that when direct-current power is quickly dropped and the quick-drop power and loss reach certain threshold conditions due to factors such as a grounding limit current function, sudden tripping of an alternating-current filter or unbalanced protection action of a grounding electrode line, the safety and stability control system can correctly and reliably act to export, cut off related units of a power plant at a sending end, and ensure the safe and stable operation of a power grid. The threshold condition means that the total power of the bipole before the fault is greater than the threshold value of the fault tripping machine of the direct-current valve group, and the direct-current power loss is greater than the threshold setting value of the direct-current fault power loss.
In the embodiment of the invention, the power tripping method of the safety and stability control system for the power speed reduction fault has simple logic, and can avoid the action of the safety and stability control system under the conditions of setting a direct-current power loss threshold, and losing small power by two layers of speed reduction or losing small power by one layer of locking plus one layer of speed reduction, thereby avoiding an exit. According to 'direct current self fault or abnormity in' safety and stability guide of electric power system '(GB 38755-2019)' 4.3.4, direct current continuous commutation failure or direct current power speed drop is caused, and when impact exceeds the bearing capacity of the system, stable control measures such as tripping, blocking direct current and the like are allowed to be taken in operation. ".
According to the safety and stability control system tripping method for the power quick-drop fault, provided by the invention, fault information of the power system which has faults is obtained, whether fault conditions of the safety and stability control system are triggered or not is judged according to the operation control mode of the power system, whether data in the fault information meet tripping threshold conditions of the safety and stability control system or not is judged after the fault conditions are triggered, if total power of a front double pole of the fault and loss quantity of direct current power in the whole time group meet the threshold conditions, the safety and stability control system can correctly and reliably act to export, relevant units of a sending-end power plant 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 stability control generator tripping strategy for high-voltage direct-current power transmission cannot correctly and reliably act to perform outlet generator tripping under the working condition that direct-current power is subjected to rapid reduction is solved, the adaptability and the reliability of the stability control function of a power system are greatly improved, and the potential safety and stability hazards of a power grid are eliminated.
In one embodiment of the present invention, in step S20, the safety and stability control system calculates the expression of the cut amount DP as:
DP＝Kset×(PDC_FLost–Pset) PDC _ FLost is the accumulated DC power loss over the whole set of successive times, KsetFor the cutting machine, the required cutting coefficient, PsetThe basic value is needed for cutting machine.
Example two:
fig. 2 is a block diagram of a generator tripping device of a safety and stability control system with a power speed reduction fault according to an embodiment of the present invention.
As shown in fig. 2, an embodiment of the present invention further provides a power shutdown device for a safety and stability control system with a power fast-drop fault, including 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 power system, where the fault information includes a time of a complete group, whether a dc valve group is locked, and whether a dc power is rapidly reduced;
the information analysis module 20 is configured to analyze whether fault information triggers a fault condition of the safety and stability control system according to an operation control manner of the power system, and if the fault information triggers the fault condition, the safety and stability control system calculates according to a control quantity to obtain a machine switching quantity and fault data, where the fault data includes total power of a double pole before a fault and a loss quantity of direct current power in a whole time group after a fault;
the execution module 30 is used for performing the cutting according to the cutting amount by the safety and stability control system when the fault data meets the threshold condition; the threshold condition comprises that the total power of the bipolar electrodes before the fault is greater than a fault tripping threshold value of the direct-current valve group, and the direct-current power loss is greater than a direct-current fault power loss threshold setting value.
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 triggering submodule 21 is configured to use a networking mode according to an operation control mode of the power system, and a fault condition for triggering the safety and stability control system is that locking or power speed reduction occurs in a direct current valve bank including at least two layers in the power system within a time of a consecutive whole group; the second triggering submodule 22 is configured to, according to that the operation control mode of the power system is an islanding mode, and the fault condition triggering the safety and stability control system is that a direct current valve bank at any layer in the power 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 a power quick-drop fault safety and stability control system cutter device, which comprises the power quick-drop fault safety and stability control system cutter 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:
an embodiment of the present invention provides a computer-readable storage medium, which is used for storing computer instructions, and when the computer instructions are executed on a computer, the computer is enabled to execute the safety and stability control system switching method for power speed reduction fault.
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 safety and stability control system switching method of the power speed reduction fault 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 safety and stability control system tripping method for power droop failure 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 specific functions, which are used to describe the execution of a computer program in a 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 place, or may be distributed on a plurality of 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 other 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 safety and stability control system switching method for power quick-drop faults is characterized by comprising the following steps:
s10, acquiring fault information of a power system, wherein the fault information comprises time of a whole group, whether a direct-current valve group 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 safety and stability control system or not according to an operation control mode of the power system, if the fault information triggers the fault condition, calculating by the safety and stability control system according to a control quantity to obtain a machine switching quantity and fault data, wherein the fault data comprises total power of a double pole before a fault and a direct current power loss quantity in a continuous whole group of time;
s30, if the fault data meet threshold conditions, the safety and stability control system performs machine cutting according to the machine cutting amount; the threshold condition comprises that the total power of the bipolar before the fault is larger than a fault tripping threshold value of the direct-current valve group, and the direct-current power loss is larger than a direct-current fault power loss threshold setting value.
2. The system tripping method for a safety and stability control system with a power speed reduction fault according to claim 1, wherein in step S20, if the operation control mode of the power system is a networking mode, the fault condition triggering the safety and stability control system is that the dc valve sets comprising at least two layers in the power system are locked or the power speed is reduced within a whole set of time in succession.
3. The safety and stability control system tripping method for power speed reduction fault according to claim 1, wherein in step S20, if the operation control mode of the power system is an islanding mode, the fault condition triggering the safety and stability control system is that a lockout or a power speed reduction occurs in a dc valve set at any layer in the power system.
4. The safety and stability control system tripping method for power droop failure according to claim 1, wherein in step S20, the safety and stability control system calculates the tripping amount DP by the following expression:
DP＝Kset×(PDC_FLost–Pset) PDC _ FLost is the accumulated DC power loss over the whole set of successive times, KsetFor the cutting machine, the required cutting coefficient, PsetThe basic value is needed for cutting machine.
5. The system tripping method for the safety and stability control of the power drop-down fault according to claim 1, wherein in step S30, the threshold setting value of the power loss amount of the direct current fault is 900-1500 MW.
6. A safety and stability control system cutter device for power quick-drop faults 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 power system, wherein the fault information comprises the time of the whole group, whether the 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 safety and stability control system or not according to the operation control mode of the power system, if the fault information triggers the fault condition, the safety and stability control system calculates according to the control quantity to obtain a machine switching quantity and fault data, and the fault data comprises total power of a front double pole of a fault and direct-current power loss quantity in the time of a whole group of successive groups;
the execution module is used for carrying out machine cutting according to the machine cutting quantity by the safety and stability control system according to the condition that the fault data meet the threshold condition; the threshold condition comprises that the total power of the bipolar before the fault is larger than a fault tripping threshold value of the direct-current valve group, and the direct-current power loss is larger than a direct-current fault power loss threshold setting value.
7. The safety and stability control system tripping device for power droop failure of claim 6, wherein the information analysis module comprises a first triggering submodule and a second triggering submodule; the first triggering submodule is used for triggering the safety and stability control system in a networking mode according to the operation control mode of the power system, and the fault condition of triggering the safety and stability control system is that at least two layers of direct-current valve banks in the power system are locked or power is rapidly reduced within the time of a whole group in succession; the second triggering submodule is used for triggering the safety and stability control system to be in an island mode according to the operation control mode of the power system, and the fault condition of the safety and stability control system is that a direct-current valve bank at any layer of the power system is locked or power is rapidly reduced.
8. A safety and stability control system generator tripping device for power speed-down faults, which is characterized by comprising the safety and stability control system generator tripping device for power speed-down faults as claimed in claim 6 or 7.
9. A computer-readable storage medium for storing computer instructions which, when executed on a computer, cause the computer to perform the safety and stability control system tripping method for power droop failure of any one 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 configured to execute the safety and stability control system tripping method for power droop failure according to any one of claims 1 to 5 according to instructions in the program code.
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