CN114221378A - Multi-equipment coordinated reactive power supporting method and device for suppressing transient overvoltage - Google Patents
Multi-equipment coordinated reactive power supporting method and device for suppressing transient overvoltage Download PDFInfo
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- 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
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- H—ELECTRICITY
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- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H9/00—Emergency protective circuit arrangements for limiting excess current or voltage without disconnection
- H02H9/04—Emergency protective circuit arrangements for limiting excess current or voltage without disconnection responsive to excess voltage
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- H—ELECTRICITY
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- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J13/00—Circuit arrangements for providing remote indication of network conditions, e.g. an instantaneous record of the open or closed condition of each circuitbreaker in the network; Circuit arrangements for providing remote control of switching means in a power distribution network, e.g. switching in and out of current consumers by using a pulse code signal carried by the network
- H02J13/00006—Circuit arrangements for providing remote indication of network conditions, e.g. an instantaneous record of the open or closed condition of each circuitbreaker in the network; Circuit arrangements for providing remote control of switching means in a power distribution network, e.g. switching in and out of current consumers by using a pulse code signal carried by the network characterised by information or instructions transport means between the monitoring, controlling or managing units and monitored, controlled or operated power network element or electrical equipment
- H02J13/00016—Circuit arrangements for providing remote indication of network conditions, e.g. an instantaneous record of the open or closed condition of each circuitbreaker in the network; Circuit arrangements for providing remote control of switching means in a power distribution network, e.g. switching in and out of current consumers by using a pulse code signal carried by the network characterised by information or instructions transport means between the monitoring, controlling or managing units and monitored, controlled or operated power network element or electrical equipment using a wired telecommunication network or a data transmission bus
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- H02J3/12—Circuit arrangements for ac mains or ac distribution networks for adjusting voltage in ac networks by changing a characteristic of the network load
- H02J3/16—Circuit arrangements for ac mains or ac distribution networks for adjusting voltage in ac networks by changing a characteristic of the network load by adjustment of reactive power
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- H02J3/36—Arrangements for transfer of electric power between ac networks via a high-tension dc link
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Abstract
The invention provides a multi-equipment coordinated reactive power supporting method and device for suppressing transient overvoltage, electronic equipment and a storage medium. Belongs to the technical field of new energy power generation. The method comprises the following steps: judging whether the electric equipment has transient overvoltage faults or not according to the voltage information of the current electric equipment grid-connected point, determining corresponding reactive response time scale levels according to the equipment types of the electric equipment, and determining corresponding reactive compensation strategies according to the equipment types of the electric equipment and the transient overvoltage fault types under the condition that the electric equipment has the transient overvoltage faults. By combining the time scales of reactive response of different equipment and the reactive compensation capability of the different equipment under different transient overvoltage faults, the support strategies of the different electric equipment under different overvoltage faults are determined, and the reactive support potential of each equipment is fully excavated, so that the uniform coordination optimization of the reactive support of the multiple equipment is realized, and the technical support is provided for improving the capability of the system for inhibiting the transient overvoltage.
Description
Technical Field
The invention relates to the technical field of new energy power generation, in particular to a multi-equipment coordination reactive power supporting method for suppressing transient overvoltage, electronic equipment and a storage medium.
Background
Renewable energy power generation technologies such as wind power and photovoltaic are mature day by day, and play an increasingly important role in energy safety, environmental improvement and economic sustainable development in China. The development mode of centralized arrangement and long-distance transmission is mostly adopted for new energy in China, and the high-voltage direct-current power transmission becomes an effective power transmission mode for realizing large-scale and large-range configuration of energy in China due to the unique advantages of long transmission distance, large transmission capacity and suitability for large-area power grid networking. Commutation failure and direct current blocking are the most common faults of a direct current transmission system, the commutation failure can cause direct current voltage drop and direct current rise, when the faults are serious or the control is not proper, the direct current blocking can be caused to interrupt the transmission of direct current power, and finally the stable operation of the whole power grid can be damaged. Therefore, the problem of transient overvoltage of the weak sending end alternating current system caused by the fault of the direct current system is used for the problem to be solved
In the related art, only a few electric power equipment have reactive power compensation capability, and a method for uniformly coordinating and optimizing different electric power equipment so as to suppress transient overvoltage after a direct current system fault is lacked.
Disclosure of Invention
The embodiment of the invention provides a multi-equipment coordinated reactive power support method for suppressing transient overvoltage, electronic equipment and a storage medium, and aims to solve the problems in the special situation.
In order to solve the technical problem, the invention is realized as follows:
in a first aspect, an embodiment of the present invention provides a multi-device coordinated reactive power support method for suppressing transient overvoltage, where the method includes:
monitoring the voltage information of the grid-connected point of each electric power equipment in real time;
judging whether the power equipment has a transient overvoltage fault or not according to the voltage information of the current power equipment grid-connected point;
obtaining a reactive response time scale grade corresponding to the equipment type of the electric equipment;
under the condition that the electric equipment has transient overvoltage faults, extracting and obtaining a reactive compensation strategy corresponding to the electric equipment according to reactive response time scale grades corresponding to the electric equipment, wherein the reactive compensation strategies corresponding to different reactive response time scale grades are different;
and performing reactive compensation by using a reactive compensation strategy corresponding to the electric equipment.
Optionally, according to the equipment type of the electric equipment, the step of obtaining the reactive response time scale level corresponding to the equipment type of the electric equipment includes:
under the condition that the equipment type of the electric equipment is a first equipment type, obtaining that a reactive response time scale grade corresponding to the equipment type of the electric equipment is a first time scale grade;
under the condition that the equipment type of the electric equipment is a second equipment type, obtaining that a reactive response time scale grade corresponding to the equipment type of the electric equipment is a second time scale grade;
under the condition that the equipment type of the electric equipment is a third equipment type, obtaining that a reactive response time scale grade corresponding to the equipment type of the electric equipment is a third time scale grade;
the minimum value of the reactive response time threshold interval corresponding to the second time scale level is greater than the maximum value of the reactive response time threshold interval of the first time scale level, and the minimum value of the reactive response time threshold interval corresponding to the third time scale level is greater than the maximum value of the reactive response time threshold interval of the second time scale level.
Optionally, the step of extracting and obtaining the reactive compensation strategy corresponding to the electric power equipment according to the reactive response time scale level corresponding to the electric power equipment includes;
under the condition that the reactive response time scale grade corresponding to the electric power equipment is a first time scale grade, extracting to obtain a reactive compensation strategy corresponding to the electric power equipment as reactive power control;
under the condition that the reactive response time scale grade corresponding to the electric equipment is a second time scale grade, extracting and obtaining a reactive compensation strategy corresponding to the electric equipment according to subclasses in the second equipment type, wherein the electric equipment of different subclasses corresponds to different reactive compensation strategies;
and under the condition that the reactive response time scale grade corresponding to the electric power equipment is a third time scale grade, extracting to obtain a reactive compensation strategy corresponding to the electric power equipment, namely directly cutting off the electric power equipment.
Optionally, according to the fault type of the transient overvoltage fault, in the case that the equipment type of the power equipment belongs to the first sub-class in the second equipment type, the reactive compensation strategy corresponding to the power equipment includes:
if the fault type of the transient overvoltage fault is a direct current commutation failure fault, the electric power equipment does not act;
if the fault type of the transient overvoltage fault is a direct current blocking shallow overvoltage fault, the electric power equipment is put into reactive power control;
and if the fault type of the transient overvoltage fault is a direct current blocking deep overvoltage fault, the electric equipment does not act.
Optionally, according to the fault type of the transient overvoltage fault, in a case that the equipment type of the power equipment belongs to the second sub-class in the second equipment type, the reactive compensation strategy corresponding to the power equipment includes:
if the fault type of the transient overvoltage fault is a direct current commutation failure fault, the electric power equipment does not act;
if the fault type of the transient overvoltage fault is a direct current blocking shallow overvoltage fault, the electric power equipment is put into reactive power control;
and if the fault type of the transient overvoltage fault is a direct current blocking deep overvoltage fault, the power equipment is switched to an asynchronous motor operation mode.
In a second aspect of the embodiments of the present invention, a multi-device coordinated reactive power apparatus for suppressing transient overvoltage is provided, where the apparatus includes:
the monitoring unit is used for monitoring the voltage information of the grid-connected point of each electric power device in real time;
the judging unit is used for judging whether the electric equipment has a transient overvoltage fault or not according to the voltage information of the current power equipment grid-connected point;
the obtaining unit is used for obtaining a reactive response time scale grade corresponding to the equipment type of the electric equipment;
the extraction unit is used for extracting and obtaining a reactive compensation strategy corresponding to the electric equipment according to the reactive response time scale grade corresponding to the electric equipment under the condition that the electric equipment has transient overvoltage faults, wherein the reactive compensation strategies corresponding to different reactive response time scale grades are different;
and the execution unit is used for performing reactive compensation by using a reactive compensation strategy corresponding to the electric equipment.
Optionally, the first determining subunit is configured to, if the equipment type of the electric power equipment is a first equipment type, obtain a reactive response time scale level corresponding to the equipment type of the electric power equipment as a first time scale level;
the second determining subunit is used for obtaining that the reactive response time scale grade corresponding to the equipment type of the electric equipment is a second time scale grade under the condition that the equipment type of the electric equipment is the second equipment type;
the third determining subunit is used for obtaining that the reactive response time scale grade corresponding to the equipment type of the electric equipment is a third time scale grade under the condition that the equipment type of the electric equipment is a third equipment type;
the minimum value of the reactive response time threshold interval corresponding to the second time scale level is greater than the maximum value of the reactive response time threshold interval of the first time scale level, and the minimum value of the reactive response time threshold interval corresponding to the third time scale level is greater than the maximum value of the reactive response time threshold interval of the second time scale level.
Optionally, the extraction unit includes:
the first extraction subunit is used for extracting and obtaining a reactive compensation strategy corresponding to the electric equipment as reactive power control under the condition that the reactive response time scale grade corresponding to the electric equipment is a first time scale grade;
a second extraction subunit, configured to, when the reactive response time scale level corresponding to the electrical equipment is a second time scale level, further extract and obtain a reactive compensation policy corresponding to the electrical equipment according to a subclass in the second equipment type;
and the third extraction subunit is used for extracting and obtaining the reactive compensation strategy corresponding to the electric equipment as direct cutting of the electric equipment under the condition that the reactive response time scale grade corresponding to the electric equipment is a third time scale grade.
A third aspect of an embodiment of the present invention provides an electronic device, including a memory, a processor, and a computer program that is stored in the memory and is executable on the processor, where the computer program is executed by the processor, and the method steps set forth in the first aspect of the embodiment of the present invention are implemented.
A fourth aspect of the embodiments of the present invention provides a computer-readable storage medium, on which a computer program is stored, which, when executed by a processor, implements the method as set forth in the first aspect of the embodiments of the present invention.
The embodiment of the invention has the following advantages: the method comprises the steps of judging whether the electric power equipment has a transient overvoltage fault or not according to the voltage information of the current power equipment grid-connected point; determining a reactive response time scale grade corresponding to the electric equipment according to the equipment type of the electric equipment; and under the condition that the electric equipment has the transient overvoltage fault, determining a reactive compensation strategy corresponding to the electric equipment according to the equipment type of the electric equipment. By combining the time scales of reactive response of different equipment and the reactive compensation capability of different equipment under different transient overvoltage faults, the support strategies of different electric equipment under different transient overvoltage faults are determined, and the reactive support potential of each equipment is fully excavated. Therefore, unified coordination and optimization of the multi-equipment reactive support are realized. And technical support is provided for further improving the transient overvoltage suppression capability of the system.
Drawings
In order to more clearly illustrate the embodiments of the present application 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, it is obvious that the drawings in the following description are only some embodiments of the present application, and for those skilled in the art, other drawings can be obtained according to the drawings without creative efforts.
Fig. 1 is a flowchart illustrating steps of a method for coordinated reactive power support of multiple devices for suppressing transient overvoltage according to an embodiment of the present invention;
FIG. 2 is a time scale schematic of reactive responses of different power equipment in an embodiment of the invention;
FIG. 3 is a schematic diagram of reactive power compensation capability of electric power equipment under different transient overvoltage faults in the embodiment of the invention;
FIG. 4 is a diagram illustrating simulation results in an embodiment of the present invention;
FIG. 5 is a schematic diagram of a functional subunit of a multi-equipment coordinated reactive power support apparatus for suppressing transient overvoltage according to an embodiment of the present invention;
fig. 6 is a schematic diagram of functional sub-units of the electronic device according to the embodiment of the present invention.
Detailed Description
The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application, and it is obvious that the described embodiments are some, but not all, embodiments of the present application. 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 application.
In the related art, a reactive power compensation device is an ideal solution to the reactive power/voltage problem, and a phase modulator, a Static Var Compensator (SVC), and a static synchronous compensator (STATCOM) are generally considered. Different reactive compensation equipment has different principles and different dynamic response characteristics, and the technical requirements of various types of power grids and application scenes in China on the reactive compensation equipment are different. Besides the reactive compensation device, the active support of the direct current transmission end power grid voltage can be realized by fully developing new energy and the reactive regulation capacity of HVDC.
The inventor finds that at present, researches on reactive compensation capability of various devices by scholars at home and abroad are mostly concentrated on the aspects of technical principles, control strategies, installation and point selection and the like, and corresponding unified coordination and optimization on the reactive compensation of the multiple devices are not performed by combining the time scales of reactive response of different devices and the reactive compensation capability under different transient overvoltage faults. Based on this, the technical scheme of this application has been proposed.
An embodiment of the present invention provides a multi-device coordinated reactive power support method for suppressing a transient overvoltage, and referring to fig. 1, fig. 1 shows a flowchart of steps of a multi-device coordinated reactive power support method for suppressing a transient overvoltage according to an embodiment of the present application, where the method includes:
and S101, monitoring the voltage information of the grid-connected point of each electric power equipment in real time.
The ultra-high voltage direct current transmission has large transmission capacity, reactive power of 50% -60% of transmission power is consumed, a direct current system is suddenly locked or operates in a power reduction mode, and when a direct current locking fault occurs, transient overvoltage with duration generally not exceeding 200-600 ms and amplitude exceeding 20% can be caused. When a direct current commutation failure fault occurs, the alternating current voltage can generate transient voltage drop and transient voltage rise with higher frequency, and the duration time of the transient voltage drop and the duration time of the transient voltage rise are about 0.02-0.04s and 0.03-0.06s respectively, so that each device in the power grid system can detect the information of a grid connection point in real time.
And S102, judging whether the electric equipment has transient overvoltage faults or not according to the voltage information of the current power equipment grid-connected point.
And each electric equipment detects whether an overvoltage phenomenon occurs in real time according to the voltage information of the grid-connected point. In this embodiment, the transient overvoltage after the dc system fault is indicated.
And S103, obtaining the reactive response time scale grade corresponding to the equipment type of the electric equipment.
The reactive response time refers to a time interval from when the reactive power in the system reaches a switching threshold to when the controller sends a switching control signal. The shorter the reactive response time of the electric power equipment is, the faster the compensation response speed of the electric power equipment is after transient overvoltage occurs. Different electric equipment has different reactive response time due to the function difference of the equipment, the reactive response time is divided in sections according to a time axis, and different reactive response time periods correspond to the time scales of reactive compensation devices in different levels. Therefore, according to the equipment type of the electric equipment, the reactive response time scale of the corresponding grade can be determined.
And S104, under the condition that the electric equipment has the transient overvoltage fault, extracting and obtaining a reactive compensation strategy corresponding to the electric equipment according to the equipment type of the electric equipment and the reactive response time scale grade corresponding to the electric equipment, wherein the reactive compensation strategies corresponding to different reactive response time scale grades are different.
After the reactive response time scale of each electric power equipment is obtained, equipment types of each electric power equipment can be classified and divided according to the reactive response time scale, and different reactive compensation strategies are executed according to the equipment types of the electric power equipment and the reactive response time scale grades corresponding to the electric power equipment under the condition that the electric power equipment with different equipment types has transient overvoltage faults after the equipment types are divided.
In the embodiment, the reactive power support of the multi-electric power equipment is uniformly coordinated and optimized by combining the time scales of reactive power responses of different electric power equipment and the reactive power compensation capabilities of different equipment under different transient overvoltage faults. Each electric equipment can automatically switch control modes according to different transient overvoltage fault types, so that reactive support under wide-range transient overvoltage faults of a power grid is realized under the coordination control of the provided strategy, the transient overvoltage after the faults of the direct current system is better inhibited, and technical support is provided for further improving the transient overvoltage inhibition capability of the system.
In a possible embodiment, the step of obtaining the reactive response time scale level corresponding to the equipment type of the electric equipment according to the equipment type of the electric equipment comprises:
under the condition that the equipment type of the electric equipment is a first equipment type, obtaining that a reactive response time scale grade corresponding to the equipment type of the electric equipment is a first time scale grade;
under the condition that the equipment type of the electric equipment is a second equipment type, obtaining that a reactive response time scale grade corresponding to the equipment type of the electric equipment is a second time scale grade;
under the condition that the equipment type of the electric equipment is a third equipment type, obtaining that a reactive response time scale grade corresponding to the equipment type of the electric equipment is a third time scale grade;
the minimum value of the reactive response time threshold interval corresponding to the second time scale level is greater than the maximum value of the reactive response time threshold interval of the first time scale level, and the minimum value of the reactive response time threshold interval corresponding to the third time scale level is greater than the maximum value of the reactive response time threshold interval of the second time scale level.
In this embodiment, a time scale diagram of the reactive response of different power equipment is shown in fig. 2. The first equipment type of electric equipment comprises a synchronous phase modulator, the sub-transient characteristic of which is capable of emitting more than 1.5 times the rated capacity of reactive power at 10ms, so that its reactive response time corresponds to the time scale of class T1 in fig. 2, the corresponding reactive response time scale class being the first time scale class. The power equipment of the third equipment type comprises an HVDC transmit ac filter with cut-off comprising logic calculations, signal transmission and switch off-time, with cut-off time of about 200ms, so its reactive response time corresponds to the time scale T4 in fig. 2, with the corresponding reactive response time scale level being the third time scale level. The second equipment type of electric power equipment comprises a Static Var Compensator SVC (Static Var Compensator), a Static Var generator SVG (Static Var generator), a permanent Magnet Direct drive wind power generation system PMSG (permanent Magnet Synchronous generator), a double-fed asynchronous generator DFIG (double fed Induction generator), a flexible Direct Current transmission system VSC-hvd (Voltage Source Converter based High Voltage Direct Current transmission), wherein SVG, PMSG, DFIG, and SVG reactive power control are essentially all reactive Current control by a Converter, in actual closed-loop control, both SVC and SVG have to be artificially delayed in an outer-loop controller to avoid problems such as controller spontaneous oscillation under certain operating conditions, so that the closed-loop reactive power response is slightly slow, the total reactive power response time is around 50ms, the total reactive power response time is around 100ms, and the total reactive power response time is from the whole SVG level, the operations performed when the direct current commutation fails are the same, so they are all divided into electrical equipment of the second equipment type, whose corresponding reactive response timescale level is the second timescale level. I.e., the timescales corresponding to the T2 timescale and the T3 timescale in fig. 2.
In a possible implementation manner, the step of extracting and obtaining the reactive compensation strategy corresponding to the electric equipment according to the reactive response time scale level corresponding to the electric equipment comprises;
under the condition that the reactive response time scale grade corresponding to the electric power equipment is a first time scale grade, extracting to obtain a reactive compensation strategy corresponding to the electric power equipment as reactive power control;
under the condition that the reactive response time scale grade corresponding to the electric equipment is a second time scale grade, extracting and obtaining a reactive compensation strategy corresponding to the electric equipment according to subclasses in the second equipment type, wherein the electric equipment of different subclasses corresponds to different reactive compensation strategies;
and under the condition that the reactive response time scale grade corresponding to the electric power equipment is a third time scale grade, extracting to obtain a reactive compensation strategy corresponding to the electric power equipment, namely directly cutting off the electric power equipment.
In this embodiment, the first equipment type of electrical equipment phase modulator is arranged to act under any over voltage transient fault, and when the phase modulator detects an over voltage transient fault at the point of grid connection, the phase modulator will autonomously perform reactive support regardless of the type of fault of the over voltage transient fault. The third equipment type of power equipment is also configured to act under any transient overvoltage fault, and when the HVDC transmitting end AC filter detects a transient overvoltage fault at a grid-connected point, the HVDC transmitting end AC filter is cut off from the power grid system regardless of the fault type of the transient overvoltage fault, so that the transient overvoltage fault is suppressed. When the power equipment SVG, SVC, PMSG, VSC-HVDC and DFIG of the second equipment type detects that the transient overvoltage fault occurs at the grid-connected point, the power equipment SVG, SVC, PMSG, VSC-HVDC and DFIG comprise a first subclass and a second subclass because the power equipment SVG, SVC, PMSG, VSC-HVDC and DFIG comprise different subclass equipment types. The specific compensation strategies for different sub-class device types are different. Therefore, it is necessary to determine the specific type of the transient overvoltage fault, and then execute a corresponding reactive power compensation strategy according to the specific type of the transient overvoltage fault.
In a possible embodiment, according to the fault type of the overvoltage transient fault, in the case that the equipment type of the power equipment belongs to the first sub-class of the second equipment type, the reactive power compensation strategy corresponding to the power equipment includes:
if the fault type of the transient overvoltage fault is a direct current commutation failure fault, the electric power equipment does not act;
if the fault type of the transient overvoltage fault is a direct current blocking shallow overvoltage fault, the electric power equipment is put into reactive power control;
and if the fault type of the transient overvoltage fault is a direct current blocking deep overvoltage fault, the electric equipment does not act.
In the embodiment, the electric power equipment SVG, SVC, PMSG, VSC-HVDC of the second equipment type is used as the first subtype of the second equipment type, and when a transient overvoltage fault occurs at the grid-connected point, if the fault type is determined to be a dc commutation failure fault. As an example, since the time of the voltage of the dc commutation failure fault is very fast, if it occurs a transient overvoltage at time t-10 ms, at the moment t-50 ms, a voltage drop occurs, since the power equipment SVG, SVC, PMSG, VSC-HVDC and DFIG reactive response time scale class of the second equipment type is the second time scale class, i.e. the time of the reactive response is 50ms or 100ms, so that the reactive suppression of the transient overvoltage occurring at the time of t 10ms is executed at the time of t 50ms, the voltage self-descending state at the moment can not track and compensate the voltage after the transient overvoltage fault of the direct current commutation failure in time, therefore, a transient overvoltage fault may be deteriorated by reactive reverse regulation, and in order to prevent the transient overvoltage fault from being deteriorated by reactive reverse regulation, the electric equipment of the third equipment type does not operate at this time, and the reactive support capability of each equipment is terminated. If the fault type is judged to be the direct current blocking fault, the transient overvoltage fault degree is continuously judged, the overvoltage capacity of the power electronic equipment is limited to a certain extent, so that the transient overvoltage after the direct current blocking fault is divided into a deep overvoltage and a shallow overvoltage according to the difference of the overvoltage amplitude, if the overvoltage amplitude is higher than lambda, the transient overvoltage fault can be called as the direct current blocking deep transient overvoltage fault, the overvoltage capacity of the power electronic equipment is exceeded, and the equipment is stopped to protect the power electronic equipment; if the voltage is lower than lambda, the transient overvoltage fault can be called as a direct current blocking shallow transient overvoltage fault, and the transient overvoltage fault is restrained by enabling each piece of equipment to carry out reactive support, and 1.3pu is taken as an example. The value in the actual scene can be selected according to the actual overvoltage capacity of the equipment, and the method is not limited in the application.
In a possible embodiment, according to the fault type of the overvoltage transient fault, in the case that the equipment type of the power equipment belongs to the second sub-class of the second equipment type, the reactive power compensation strategy corresponding to the power equipment includes:
if the fault type of the transient overvoltage fault is a direct current commutation failure fault, the electric power equipment does not act;
if the fault type of the transient overvoltage fault is a direct current blocking shallow overvoltage fault, the electric power equipment is put into reactive power control;
and if the fault type of the transient overvoltage fault is a direct current blocking deep overvoltage fault, the power equipment is switched to an asynchronous motor operation mode.
In the present embodiment, the electric power equipment DFIG of the second equipment type is used as a second subtype of the second equipment type, and when the overvoltage transient fault is detected at the grid-connected point, if the fault type is determined to be the dc commutation failure fault. As an example, since the time for a dc commutation failure to break down its voltage is very fast, to prevent reactive flyback degradation transient over-voltage faults, the DFIG does not operate at this time, terminating its reactive support capability. And if the fault type is judged to be the direct current blocking fault, the transient overvoltage fault degree is continuously judged. When the fault occurs in the transient overvoltage fault of the direct current blocking depth, the DFIG is controlled to disconnect the converter, so that the working DFIG can perform reactive power regulation to suppress the transient overvoltage fault spontaneously in a DFIG + Crowbar asynchronous motor mode. When the direct current blocking shallow transient overvoltage fault occurs, the DFIG converter is enabled to perform reactive power support to suppress the transient overvoltage fault. If the direct current blocking shallow transient overvoltage fault occurs, the equipment is enabled to carry out reactive support respectively at the moment to restrain the transient overvoltage fault, and 1.3pu is taken as an example. The value in the actual scene can be selected according to the actual overvoltage capacity of the equipment, and the method is not limited in the application.
An embodiment of the present invention further provides a multi-device coordinated reactive power support system for suppressing transient overvoltage, and referring to fig. 5, a functional unit diagram of a multi-device coordinated reactive power support device for grid-connected transient overvoltage suppression according to the present invention is shown, where the system may include the following units:
the monitoring unit 501 is used for monitoring the voltage information of the grid-connected point of each electric power equipment in real time;
a judging unit 502, configured to judge whether a transient overvoltage fault exists in the power equipment according to voltage information of a grid-connected point of the current power equipment;
an obtaining unit 503, configured to obtain a reactive response time scale level corresponding to an equipment type of the electric power equipment;
an extracting unit 504, configured to, when the electrical equipment has a transient overvoltage fault, extract and obtain a reactive compensation policy corresponding to the electrical equipment according to a reactive response time scale level corresponding to the electrical equipment, where corresponding reactive compensation policies are different in different reactive response time scale levels;
and an executing unit 505, configured to perform reactive compensation by using a reactive compensation strategy corresponding to the electric equipment.
In a possible implementation, the determining unit 503 includes:
the first determining subunit is used for obtaining that the reactive response time scale grade corresponding to the equipment type of the electric equipment is a first time scale grade under the condition that the equipment type of the electric equipment is the first equipment type;
the second determining subunit is used for obtaining that the reactive response time scale grade corresponding to the equipment type of the electric equipment is a second time scale grade under the condition that the equipment type of the electric equipment is the second equipment type;
the third determining subunit is used for obtaining that the reactive response time scale grade corresponding to the equipment type of the electric equipment is a third time scale grade under the condition that the equipment type of the electric equipment is a third equipment type;
the minimum value of the reactive response time threshold interval corresponding to the second time scale level is greater than the maximum value of the reactive response time threshold interval of the first time scale level, and the minimum value of the reactive response time threshold interval corresponding to the third time scale level is greater than the maximum value of the reactive response time threshold interval of the second time scale level.
In a possible implementation, the extraction unit 504 includes:
the first extraction subunit is used for extracting and obtaining a reactive compensation strategy corresponding to the electric equipment as reactive power control under the condition that the reactive response time scale grade corresponding to the electric equipment is a first time scale grade;
a second extraction subunit, configured to, when the reactive response time scale level corresponding to the electrical equipment is a second time scale level, further extract and obtain a reactive compensation policy corresponding to the electrical equipment according to a subclass in the second equipment type;
and the third extraction subunit is used for extracting and obtaining the reactive compensation strategy corresponding to the electric equipment as direct cutting of the electric equipment under the condition that the reactive response time scale grade corresponding to the electric equipment is a third time scale grade.
An embodiment of the present invention further provides an electronic device, as shown in fig. 6, including a processor 61, a communication interface 62, a memory 63, and a communication bus 64, where the processor 61, the communication interface 62, and the memory 63 complete mutual communication through the communication bus 64,
a memory 63 for storing a computer program;
the processor 61 is configured to implement the steps of the first aspect of the embodiment of the present invention when executing the program stored in the memory 63.
The communication bus mentioned in the above terminal may be a Peripheral Component Interconnect (PCI) bus, an Extended Industry Standard Architecture (EISA) bus, or the like. The communication bus may be divided into an address bus, a data bus, a control bus, etc. For ease of illustration, only one thick line is shown, but this does not mean that there is only one bus or one type of bus.
The communication interface is used for communication between the terminal and other equipment.
The Memory may include a Random Access Memory (RAM) or a non-volatile Memory (non-volatile Memory), such as at least one disk Memory. Optionally, the memory may also be at least one memory device located remotely from the processor.
The Processor may be a general-purpose Processor, and includes a Central Processing Unit (CPU), a Network Processor (NP), and the like; the Integrated Circuit may also be a Digital Signal Processor (DSP), an Application Specific Integrated Circuit (ASIC), a Field Programmable Gate Array (FPGA) or other Programmable logic device, a discrete Gate or transistor logic device, or a discrete hardware component.
In yet another embodiment of the present invention, a computer-readable storage medium is further provided, where instructions are stored in the computer-readable storage medium, and when the instructions are executed on a computer, the computer is caused to execute the method for grid-connected transient overvoltage suppression and multi-equipment coordinated reactive power support according to any one of the foregoing embodiments.
The embodiments in the present specification are described in a progressive manner, each embodiment focuses on differences from other embodiments, and the same and similar parts among the embodiments are referred to each other.
As will be appreciated by one skilled in the art, embodiments of the present invention may be provided as a method, apparatus, or computer program product. Accordingly, embodiments of the present invention may take the form of an entirely hardware embodiment, an entirely software embodiment or an embodiment combining software and hardware aspects. Furthermore, embodiments of the present invention may take the form of a computer program product embodied on one or more computer-usable storage media (including, but not limited to, disk storage, CD-ROM, optical storage, and the like) having computer-usable program code embodied therein.
Embodiments of the present invention are described with reference to flowchart illustrations and/or block diagrams of methods, terminal devices (systems), and computer program products according to embodiments of the invention. It will be understood that each flow and/or block of the flow diagrams and/or block diagrams, and combinations of flows and/or blocks in the flow diagrams and/or block diagrams, can be implemented by computer program instructions. These computer program instructions may be provided to a processor of a general purpose computer, special purpose computer, embedded processor, or other programmable data processing terminal to produce a machine, such that the instructions, which execute via the processor of the computer or other programmable data processing terminal, create means for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.
These computer program instructions may also be stored in a computer-readable memory that can direct a computer or other programmable data processing terminal to function in a particular manner, such that the instructions stored in the computer-readable memory produce an article of manufacture including instruction means which implement the function specified in the flowchart flow or flows and/or block diagram block or blocks.
These computer program instructions may also be loaded onto a computer or other programmable data processing terminal to cause a series of operational steps to be performed on the computer or other programmable terminal to produce a computer implemented process such that the instructions which execute on the computer or other programmable terminal provide steps for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.
Finally, it should also be noted that, herein, relational terms such as first and second, and the like may be used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. "and/or" means that either or both of them can be selected. Also, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or terminal that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or terminal. Without further limitation, an element defined by the phrase "comprising an … …" does not exclude the presence of other like elements in a process, method, article, or terminal that comprises the element.
The method, the system, the device and the storage medium for multi-device coordinated reactive power support for suppressing transient overvoltage provided by the invention are described in detail, a specific example is applied in the description to explain the principle and the implementation mode of the invention, and the description of the above embodiment is only used for helping to understand the method and the core idea of the invention; meanwhile, for a person skilled in the art, according to the idea of the present invention, there may be variations in the specific embodiments and the application scope, and in summary, the content of the present specification should not be construed as a limitation to the present invention.
Claims (10)
1. A multi-equipment coordinated reactive power supporting method for suppressing transient overvoltage, which is characterized by comprising the following steps:
monitoring the voltage information of the grid-connected point of each electric power equipment in real time;
judging whether the power equipment has a transient overvoltage fault or not according to the voltage information of the current power equipment grid-connected point;
obtaining a reactive response time scale grade corresponding to the equipment type of the electric equipment;
under the condition that the electric equipment has transient overvoltage faults, extracting and obtaining a reactive compensation strategy corresponding to the electric equipment according to reactive response time scale grades corresponding to the electric equipment, wherein the reactive compensation strategies corresponding to different reactive response time scale grades are different;
and performing reactive compensation by using a reactive compensation strategy corresponding to the electric equipment.
2. The method of claim 1, wherein obtaining the reactive response time scale class corresponding to the equipment type of the electrical equipment according to the equipment type of the electrical equipment comprises:
under the condition that the equipment type of the electric equipment is a first equipment type, obtaining that a reactive response time scale grade corresponding to the equipment type of the electric equipment is a first time scale grade;
under the condition that the equipment type of the electric equipment is a second equipment type, obtaining that a reactive response time scale grade corresponding to the equipment type of the electric equipment is a second time scale grade;
under the condition that the equipment type of the electric equipment is a third equipment type, obtaining that a reactive response time scale grade corresponding to the equipment type of the electric equipment is a third time scale grade;
the minimum value of the reactive response time threshold interval corresponding to the second time scale level is greater than the maximum value of the reactive response time threshold interval of the first time scale level, and the minimum value of the reactive response time threshold interval corresponding to the third time scale level is greater than the maximum value of the reactive response time threshold interval of the second time scale level.
3. The method of claim 2, wherein the step of extracting the reactive power compensation strategy corresponding to the electric equipment according to the reactive power response time scale level corresponding to the electric equipment comprises;
under the condition that the reactive response time scale grade corresponding to the electric power equipment is a first time scale grade, extracting to obtain a reactive compensation strategy corresponding to the electric power equipment as reactive power control;
under the condition that the reactive response time scale grade corresponding to the electric equipment is a second time scale grade, extracting and obtaining a reactive compensation strategy corresponding to the electric equipment according to subclasses in the second equipment type, wherein the electric equipment of different subclasses corresponds to different reactive compensation strategies;
and under the condition that the reactive response time scale grade corresponding to the electric power equipment is a third time scale grade, extracting to obtain a reactive compensation strategy corresponding to the electric power equipment, namely directly cutting off the electric power equipment.
4. The method according to claim 3, wherein, according to the fault type of the over voltage transient fault, in case that the equipment type of the power equipment belongs to the first sub-class of the second equipment type, the reactive compensation strategy corresponding to the power equipment comprises:
if the fault type of the transient overvoltage fault is a direct current commutation failure fault, the electric power equipment does not act;
if the fault type of the transient overvoltage fault is a direct current blocking shallow overvoltage fault, the electric power equipment is put into reactive power control;
and if the fault type of the transient overvoltage fault is a direct current blocking deep overvoltage fault, the electric equipment does not act.
5. The method according to claim 3, wherein, according to the fault type of the over voltage transient fault, in case that the equipment type of the power equipment belongs to the second sub-class of the second equipment type, the reactive compensation strategy corresponding to the power equipment comprises:
if the fault type of the transient overvoltage fault is a direct current commutation failure fault, the electric power equipment does not act;
if the fault type of the transient overvoltage fault is a direct current blocking shallow overvoltage fault, the electric power equipment is put into reactive power control;
and if the fault type of the transient overvoltage fault is a direct current blocking deep overvoltage fault, the power equipment is switched to an asynchronous motor operation mode.
6. A multi-equipment coordinated reactive power support device for suppressing transient overvoltage, the device comprising:
the monitoring unit is used for monitoring the voltage information of the grid-connected point of each electric power device in real time;
the judging unit is used for judging whether the electric equipment has a transient overvoltage fault or not according to the voltage information of the current power equipment grid-connected point;
the obtaining unit is used for obtaining a reactive response time scale grade corresponding to the equipment type of the electric equipment;
the extraction unit is used for extracting and obtaining a reactive compensation strategy corresponding to the electric equipment according to the reactive response time scale grade corresponding to the electric equipment under the condition that the electric equipment has transient overvoltage faults, wherein the reactive compensation strategies corresponding to different reactive response time scale grades are different;
and the execution unit is used for performing reactive compensation by using a reactive compensation strategy corresponding to the electric equipment.
7. The apparatus of claim 6, wherein the determining unit comprises:
the first determining subunit is used for obtaining that the reactive response time scale grade corresponding to the equipment type of the electric equipment is a first time scale grade under the condition that the equipment type of the electric equipment is the first equipment type;
the second determining subunit is used for obtaining that the reactive response time scale grade corresponding to the equipment type of the electric equipment is a second time scale grade under the condition that the equipment type of the electric equipment is the second equipment type;
the third determining subunit is used for obtaining that the reactive response time scale grade corresponding to the equipment type of the electric equipment is a third time scale grade under the condition that the equipment type of the electric equipment is a third equipment type;
the minimum value of the reactive response time threshold interval corresponding to the second time scale level is greater than the maximum value of the reactive response time threshold interval of the first time scale level, and the minimum value of the reactive response time threshold interval corresponding to the third time scale level is greater than the maximum value of the reactive response time threshold interval of the second time scale level.
8. The apparatus of claim 6, wherein the extraction unit comprises:
the first extraction subunit is used for extracting and obtaining a reactive compensation strategy corresponding to the electric equipment as reactive power control under the condition that the reactive response time scale grade corresponding to the electric equipment is a first time scale grade;
a second extraction subunit, configured to, when the reactive response time scale level corresponding to the electrical equipment is a second time scale level, further extract and obtain a reactive compensation policy corresponding to the electrical equipment according to a subclass in the second equipment type;
and the third extraction subunit is used for extracting and obtaining the reactive compensation strategy corresponding to the electric equipment as direct cutting of the electric equipment under the condition that the reactive response time scale grade corresponding to the electric equipment is a third time scale grade.
9. Electronic equipment comprising a memory, a processor and a computer program stored on the memory and executable on the processor, characterized in that the steps of the method according to any of claims 1 to 5 are implemented by the processor when executing the computer program.
10. A computer-readable storage medium, on which a computer program is stored which, when being executed by a processor, carries out the steps of the method according to any one of claims 1 to 5.
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| CN117543518A (en) * | 2023-12-01 | 2024-02-09 | 国网青海省电力公司清洁能源发展研究院 | Transient overvoltage control system and method |
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| CN117543518A (en) * | 2023-12-01 | 2024-02-09 | 国网青海省电力公司清洁能源发展研究院 | Transient overvoltage control system and method |
| CN117543518B (en) * | 2023-12-01 | 2024-05-03 | 国网青海省电力公司清洁能源发展研究院 | Transient overvoltage control system and method |
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