CN113447760B - Modeling method and system for composite fault element in full electromagnetic transient fault scanning - Google Patents
Modeling method and system for composite fault element in full electromagnetic transient fault scanning Download PDFInfo
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Abstract
The invention provides a modeling method and a system for a composite fault element in full electromagnetic transient fault scanning, which are used for encapsulating basic parameters and fault information of a power element by expanding parameter information of the power element to form the composite fault element, realizing the setting of multiple fault types and the encapsulation of corresponding power elements, and providing a convenient operation and measurement setting interface, thereby facilitating the setting of single or complex faults of the power element, solving the problems of low modeling efficiency, continuous addition of various signals and control elements, difficult topology deletion, easy error and the like of a large-scale power grid fault electromagnetic transient scanning power grid, realizing the replacement of the fault-containing element and the corresponding fault setting of an electromagnetic transient model of the large-scale power grid, and being very suitable for an application scene of the full electromagnetic transient fault scanning of the large-scale power grid.
Description
Technical Field
The invention relates to the technical field of power grid electromagnetic transient simulation, in particular to a method and a system for modeling a composite fault element in full electromagnetic transient fault scanning.
Background
The high-speed development of the existing power grid, the use of a large number of novel devices provides challenges for the control of the power grid, advanced simulation technology is required for supporting the cognition of the characteristic mechanism of the extra-high voltage alternating current and direct current power grid and the power grid control capability, and the electromagnetic transient simulation research of the large-scale alternating current and direct current power grid must be carried out. Electromagnetic transient fault scanning is carried out on a large-scale power grid to find a weak link of the power grid, the risk level of the power grid is evaluated, potential hazards of the power grid are well checked and managed, and necessary technical support is provided for power grid construction.
For large-scale power grid full-electromagnetic transient fault scanning, the establishment of a fault simulation model is a difficult task, and the large-scale power grid fault scanning needs to perform fault setting on a power grid model for many times, frequently add and delete power elements and modify the power grid model. The traditional manual power grid model modifying mode is large in workload and easy to make mistakes. For complex batch composite fault setting, manual setting is difficult to realize.
Disclosure of Invention
The invention aims to provide a modeling method and a modeling system for a composite fault element in full electromagnetic transient fault scanning, which aim to solve the problems of low modeling efficiency of a large-scale power grid fault electromagnetic transient scanning power grid, continuous increase of various signals and control elements, difficult topology deletion, easy error and the like, and improve the working efficiency of the large-scale power grid electromagnetic transient fault scanning power grid modeling.
In order to achieve the technical purpose, the invention provides a modeling method of a composite fault element in full electromagnetic transient fault scanning, which comprises the following operations:
selecting a power element needing to be added with fault setting, and automatically adding a fault switch element and grounding impedance at two ends of the power element;
an electrical information measuring unit which automatically adds the electrical element to obtain the measuring information of the electrical element;
setting fault type selection and fault time sequence setting logic, and automatically configuring the setting and action time sequence of a fault switch according to the fault type selection and the fault time sequence setting;
setting a selection logic for outputting the measurement information, and automatically enabling the corresponding measurement information to be output according to the selection logic;
packaging the power element, the fault switch, the grounding impedance and the measuring unit to form an independent composite fault element;
and automatically shielding and replacing the existing power elements according to the setting of the composite fault elements, and completing the replacement one by one according to the sequence list of the composite fault elements to complete automatic fault scanning.
Preferably, the automatically adding the fault switch element and the ground impedance at the two ends of the power element is specifically:
three-phase switches are added at two ends of a three-phase instantaneous, single-phase permanent and three-phase fault single-phase rejection element, single-phase instantaneous faults only need to add single-phase switches at two ends of a fault phase, and zero resistance is added at a non-fault phase;
adding a single-phase or three-phase grounding switch at a fault position for the grounding fault, and adding a single-phase interphase fault switch at a fault position for the interphase fault;
whether single-phase or three-phase ground impedance is added is selected according to whether the ground impedance exists.
Preferably, the electrical information measuring unit includes a voltmeter measuring a voltage across the faulty element, an ammeter measuring a current of the faulty element, a voltmeter measuring a voltage at the fault point, an ammeter measuring a current at the fault point, and a wattmeter measuring a power of the faulty element.
Preferably, the fault types comprise three-phase instantaneous fault, single-phase permanent fault, three-phase fault and single-phase refusal, two-phase-to-phase fault and two-phase grounding fault; the fault time sequence comprises the tripping time of fault phase switches at two ends of a fault unit, reclosing time and the tripping time of three-phase switches at two ends of a fault element.
Preferably, for the three-phase instantaneous fault, adding three-phase switches on two sides of a fault element, adding three-phase fault switches at a fault point, and adding a switch action signal on two sides of the fault element and a fault switch action signal; for the single-phase instantaneous fault, adding fault phase switches at two ends of a fault element, adding zero resistance at two ends of a non-fault phase, adding a single-phase fault switch at a fault point, and adding a fault switch action signal and a non-fault phase switch action signal; for the single-phase permanent fault, adding three-phase switches on two sides of a fault element, adding a single-phase fault switch at a fault point, and adding a fault switch action signal, a fault phase switch action signal and a non-fault phase switch action signal; and for the single-phase fault rejection of the three-phase fault, adding a three-phase fault switch at a fault point, adding three-phase switches at two sides of a fault element, and adding a rejected moving phase switch action signal, a non-rejected moving phase switch action signal and a fault switch action signal.
The invention also provides a composite fault element modeling system in full electromagnetic transient fault scanning, which comprises:
the power element extension module is used for selecting a power element needing to be added with fault setting, and automatically adding a fault switch element and grounding impedance at two ends of the power element;
the electrical information measuring module is used for automatically adding an electrical information measuring unit of the power element so as to obtain the measuring information of the power element;
the fault logic setting module is used for setting fault type selection and fault time sequence setting logic and automatically configuring the setting and action time sequence of the fault switch according to the fault type selection and the fault time sequence setting;
the measuring information output module is used for setting selection logic for outputting the measuring information and automatically enabling the corresponding measuring information to be output according to the selection logic;
the fault element packaging module is used for packaging the power element, the fault switch, the grounding impedance and the measuring unit to form an independent composite fault element;
and the fault element replacement module is used for automatically shielding and replacing the existing power elements according to the setting of the composite fault element, completing the replacement one by one according to the sequence list of the composite fault element and completing automatic fault scanning.
Preferably, the electrical information measuring unit includes a voltmeter measuring a voltage across the faulty element, an ammeter measuring a current of the faulty element, a voltmeter measuring a voltage at the fault point, an ammeter measuring a current at the fault point, and a wattmeter measuring a power of the faulty element.
Preferably, the fault types comprise three-phase instantaneous fault, single-phase permanent fault, three-phase fault and single-phase refusal, two-phase-to-phase fault and two-phase grounding fault; the fault time sequence comprises the tripping time of fault phase switches at two ends of a fault unit, reclosing time and the tripping time of three-phase switches at two ends of a fault element.
The effect provided in the summary of the invention is only the effect of the embodiment, not all the effects of the invention, and one of the above technical solutions has the following advantages or beneficial effects:
compared with the prior art, the method and the device have the advantages that the fault modeling is automatically realized, the basic parameters and the fault information of the power element are encapsulated by expanding the parameter information of the power element, the composite fault element is formed, the setting of multiple fault types and the encapsulation of the corresponding power element are realized, and a convenient operation and measurement setting interface is provided, so that the setting of single or complex faults of the power element is convenient, the problems of low power grid modeling efficiency, continuous addition of various signals and control elements, difficult topology deletion, easy error and the like of large-scale power grid fault electromagnetic transient scanning are solved, the replacement of the fault element and the corresponding fault setting of the electromagnetic transient model of the large-scale power grid can be realized, and the method and the device are very suitable for the application scene of large-scale power grid full electromagnetic transient fault scanning.
Drawings
Fig. 1 is a flowchart of a modeling method for a composite fault element in a full electromagnetic transient fault scan according to an embodiment of the present invention;
fig. 2 is a structural block diagram of a modeling system of a composite fault element in a full electromagnetic transient fault scan according to an embodiment of the present invention.
Detailed Description
In order to clearly explain the technical features of the present invention, the present invention is explained in detail by the following embodiments and the accompanying drawings. The following disclosure provides many different embodiments, or examples, for implementing different features of the invention. To simplify the disclosure of the present invention, the components and arrangements of specific examples are described below. Furthermore, the present invention may repeat reference numerals and/or letters in the various examples. This repetition is for the purpose of simplicity and clarity and does not in itself dictate a relationship between the various embodiments and/or configurations discussed. It should be noted that the components illustrated in the figures are not necessarily drawn to scale. Descriptions of well-known components and processing techniques and procedures are omitted so as to not unnecessarily limit the invention.
The following describes in detail a method and a system for modeling a composite fault element in a full electromagnetic transient fault scan according to an embodiment of the present invention with reference to the accompanying drawings.
As shown in fig. 1, an embodiment of the present invention discloses a method for modeling a composite fault element in a full electromagnetic transient fault scan, where the method includes the following operations:
selecting a power element needing to be added with fault setting, and automatically adding a fault switch element and grounding impedance at two ends of the power element;
an electrical information measuring unit which automatically adds the electrical element to obtain the measuring information of the electrical element;
setting fault type selection and fault time sequence setting logic, and automatically configuring the setting and action time sequence of a fault switch according to the fault type selection and the fault time sequence setting;
setting selection logic for outputting the measurement information, and automatically enabling the corresponding measurement information to be output according to the selection logic;
packaging the power element, the fault switch, the grounding impedance and the measuring unit to form an independent composite fault element;
and automatically shielding and replacing the existing power elements according to the setting of the composite fault elements, and completing the replacement one by one according to the sequence list of the composite fault elements to complete automatic fault scanning.
According to the embodiment of the invention, the automatic fault modeling is used for replacing the traditional manual power grid model modifying mode, so that the working efficiency of large-scale power grid electromagnetic transient fault scanning power grid modeling is greatly improved.
And selecting a power element needing to be added with fault setting, and adding a fault switching element and grounding impedance at two ends of the power element so as to adapt to the action logic requirements of multiple fault types.
The two ends of the power element are added with switches or zero resistance, the three-phase switches are added at the two ends of the three-phase instantaneous, single-phase permanent and three-phase fault single-phase rejection element, and the single-phase instantaneous fault only needs to be added at the two ends of the fault phase, and the zero resistance is added at the non-fault phase. Single-phase or three-phase earthing switches are added at the fault position for the earth fault, and single-phase interphase fault switches are added at the fault position for the interphase fault. Whether single-phase or three-phase ground impedance is added is selected according to whether the ground impedance exists.
The electric information measuring unit automatically adds the power element and comprises a voltmeter for measuring the voltage at two ends of the fault element, an ammeter for measuring the current of the fault element, a voltmeter for measuring the voltage at a fault point, an ammeter for measuring the current at the fault point and a power meter for measuring the power of the fault element.
Setting fault type selection and fault sequence setting logic, and automatically configuring the setting and action sequence of the fault switch according to the selection and setting. The fault types comprise three-phase instantaneous faults, single-phase permanent faults, three-phase faults and single-phase refusal, two-phase faults and two-phase ground faults. The fault time sequence comprises the tripping time of a fault phase switch at two ends of a fault unit, reclosing time and the tripping time of a three-phase switch at two ends of a fault element.
For three-phase instantaneous faults, three-phase switches are added on two sides of a fault element, three-phase fault switches are added at a fault point, and switch action signals on two sides of the fault element and fault switch action signals are added.
For single-phase instantaneous faults, fault phase switches are added to two ends of a fault element, zero resistance is added to two ends of a non-fault phase, a single-phase fault switch is added to a fault point, and a fault switch action signal and a non-fault phase switch action signal are added.
For single-phase permanent faults, three-phase switches are added on two sides of a fault element, a single-phase fault switch is added at a fault point, and a fault switch action signal, a fault phase switch action signal and a non-fault phase switch action signal are added.
For single-phase fault rejection of a three-phase fault, a three-phase fault switch is added at a fault point, three-phase switches on two sides of a fault element are added, and a fault phase rejection switch action signal, a non-fault phase rejection switch action signal and a fault switch action signal are added.
And setting selection logic for outputting the measurement information, and automatically enabling the corresponding measurement output according to the selection logic. And determining whether to add a voltmeter, an ammeter and a power meter for measuring the fault element according to the selection logic enable, and determining whether to add the voltmeter and the ammeter for measuring the short-circuit point information.
And packaging the power element, the fault switch, the grounding impedance and the measuring unit to form an independent composite fault element, and setting a uniform fault and measurement setting interface. And generating a composite fault element example according to the setting of the composite fault element, automatically shielding and replacing the existing power element, forming a new power grid model with fault information without changing the original network topology structure after replacement, and completing the replacement one by one according to the sequence list of the composite fault element to realize automatic fault scanning.
The invention starts from automatically realizing fault modeling, encapsulates basic parameters and fault information of the electric power element by expanding parameter information of the electric power element to form a composite fault element, realizes setting of multiple fault types and encapsulation of corresponding electric power elements, and provides a convenient operation and measurement setting interface, thereby facilitating setting of single or complex faults of the electric power element, solving the problems of low efficiency of electromagnetic transient scanning power grid modeling of large-scale power grid faults, continuous increase of various signals and control elements, difficult topology deletion, easy error and the like, realizing replacement of fault-containing elements and corresponding fault setting for an electromagnetic transient model of the large-scale power grid, and being very suitable for application scenes of full electromagnetic transient fault scanning of the large-scale power grid.
As shown in fig. 2, an embodiment of the present invention further discloses a modeling system for a composite fault element in full electromagnetic transient fault scanning, where the system includes:
the power element extension module is used for selecting a power element needing to be added with fault setting, and automatically adding a fault switch element and grounding impedance at two ends of the power element;
the electrical information measuring module is used for automatically adding an electrical information measuring unit of the power element so as to obtain the measuring information of the power element;
the fault logic setting module is used for setting fault type selection and fault time sequence setting logic and automatically configuring the setting and action time sequence of the fault switch according to the fault type selection and the fault time sequence setting;
the measuring information output module is used for setting selection logic for outputting the measuring information and automatically enabling the corresponding measuring information to be output according to the selection logic;
the fault element packaging module is used for packaging the power element, the fault switch, the grounding impedance and the measuring unit to form an independent composite fault element;
and the fault element replacement module is used for automatically shielding and replacing the existing power elements according to the setting of the composite fault element, completing the replacement one by one according to the sequence list of the composite fault element and completing automatic fault scanning.
According to the embodiment of the invention, the automatic fault modeling is adopted to replace the traditional manual power grid model modifying mode, so that the working efficiency of large-scale power grid electromagnetic transient fault scanning power grid modeling is greatly improved.
The power element needing to be added with fault setting is selected through the power element extension module, and the fault switch element and the grounding impedance are added at the two ends of the power element so as to adapt to the action logic requirements of various fault types.
The two ends of the power element are added with switches or zero resistance, the three-phase switches are added at the two ends of the three-phase instantaneous, single-phase permanent and three-phase fault single-phase rejection element, and the single-phase instantaneous fault only needs to be added at the two ends of the fault phase, and the zero resistance is added at the non-fault phase. Single-phase or three-phase earthing switches are added at the fault position for the earth fault, and single-phase interphase fault switches are added at the fault position for the interphase fault. Whether single-phase or three-phase ground impedance is added is selected according to whether the ground impedance exists.
The electric information measuring unit comprises a voltmeter for measuring voltages at two ends of the fault element, an ammeter for measuring current of the fault element, a voltmeter for measuring voltage at a fault point, an ammeter for measuring current at the fault point and a power meter for measuring power of the fault element.
And setting fault type selection and fault time sequence setting logics through a fault logic setting module, and automatically configuring the setting and action time sequence of the fault switch according to the selection and the setting. The fault types comprise three-phase instantaneous faults, single-phase permanent faults, three-phase faults, single-phase refusal, two-phase interphase faults and two-phase grounding faults. The fault time sequence comprises the tripping time of a fault phase switch at two ends of a fault unit, reclosing time and the tripping time of a three-phase switch at two ends of a fault element.
For the three-phase instantaneous fault, a three-phase switch is added on two sides of a fault element, a three-phase fault switch is added at a fault point, and a switch action signal on two sides of the fault element and a fault switch action signal are added.
For single-phase instantaneous faults, fault phase switches are added to two ends of a fault element, zero resistance is added to two ends of a non-fault phase, a single-phase fault switch is added to a fault point, and a fault switch action signal and a non-fault phase switch action signal are added.
For single-phase permanent faults, three-phase switches are added on two sides of a fault element, a single-phase fault switch is added at a fault point, and a fault switch action signal, a fault phase switch action signal and a non-fault phase switch action signal are added.
And for single-phase rejection of the three-phase fault, adding a three-phase fault switch at a fault point, adding three-phase switches on two sides of a fault element, and adding a rejected moving phase switch action signal, a non-rejected moving phase switch action signal and a fault switch action signal.
The measuring information output module is used for setting selection logic for outputting the measuring information and automatically enabling corresponding measuring output according to the selection logic. And determining whether to add a voltmeter, an ammeter and a power meter for measuring the fault element according to the selection logic enable, and determining whether to add the voltmeter and the ammeter for measuring the short-circuit point information.
The power element, the fault switch, the grounding impedance and the measuring unit are packaged by the fault element packaging module to form an independent composite fault element, and a uniform fault and measurement setting interface is set. The composite fault element instance is generated by the fault element replacement module according to the setting of the composite fault element, the existing power element is automatically shielded and replaced, the original network topology structure is not changed after the replacement, a new power grid model with fault information is formed, the replacement is completed one by one according to the sequence list of the composite fault element, and automatic fault scanning is realized.
The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents and improvements made within the spirit and principle of the present invention are intended to be included within the scope of the present invention.
Claims (7)
1. A method for modeling a composite fault element in an all-electromagnetic transient fault scan, the method comprising the operations of:
selecting a power element needing to be added with fault setting, and automatically adding a fault switch element and grounding impedance at two ends of the power element; three-phase switches are added at two ends of a three-phase instantaneous, single-phase permanent and three-phase fault single-phase rejection element, single-phase instantaneous faults only need to add single-phase switches at two ends of a fault phase, and zero resistance is added at a non-fault phase; adding a single-phase or three-phase grounding switch at a fault position for the grounding fault, and adding a single-phase interphase fault switch at a fault position for the interphase fault; selecting whether to add single-phase or three-phase grounding impedance according to whether grounding impedance exists;
an electrical information measuring unit which automatically adds the electrical element to obtain the measuring information of the electrical element;
setting fault type selection and fault time sequence setting logic, and automatically configuring the setting and action time sequence of a fault switch according to the fault type selection and the fault time sequence setting;
setting selection logic for outputting the measurement information, and automatically enabling the corresponding measurement information to be output according to the selection logic;
packaging the power element, the fault switch, the grounding impedance and the measuring unit to form an independent composite fault element;
and automatically shielding and replacing the existing power elements according to the setting of the composite fault elements, and completing the replacement one by one according to the sequence list of the composite fault elements to complete automatic fault scanning.
2. The modeling method for the composite fault element in the all-electromagnetic transient fault scanning according to claim 1, wherein the electrical information measuring unit comprises a voltmeter for measuring the voltage across the fault element, an ammeter for measuring the current of the fault element, a voltmeter for measuring the voltage at the fault point, an ammeter for measuring the current at the fault point, and a wattmeter for measuring the power of the fault element.
3. The modeling method for the composite fault element in the all-electromagnetic transient fault scanning process according to claim 1, wherein the fault types comprise a three-phase transient fault, a single-phase permanent fault, a three-phase fault and a single-phase failure, a two-phase-to-phase fault and a two-phase grounding fault; the fault time sequence comprises the tripping time of fault phase switches at two ends of a fault unit, reclosing time and the tripping time of three-phase switches at two ends of a fault element.
4. A modeling method for a compound fault element in full electromagnetic transient fault scanning according to claim 3, characterized in that for the three-phase transient fault, three-phase switches are added at both sides of the fault element and at the fault point, and a switch action signal at both sides of the fault element and a fault switch action signal are added; for the single-phase instantaneous fault, adding fault phase switches at two ends of a fault element, adding zero resistance at two ends of a non-fault phase, adding a single-phase fault switch at a fault point, and adding a fault switch action signal and a non-fault phase switch action signal; for the single-phase permanent fault, adding three-phase switches on two sides of a fault element, adding a single-phase fault switch at a fault point, and adding a fault switch action signal, a fault phase switch action signal and a non-fault phase switch action signal; and for the single-phase fault rejection of the three-phase fault, adding a three-phase fault switch at a fault point, adding three-phase switches on two sides of a fault element, and adding a rejected moving phase switch action signal, a non-rejected moving phase switch action signal and a fault switch action signal.
5. A system for modeling a composite fault element in an all-electromagnetic transient fault scan, the system comprising:
the power element extension module is used for selecting a power element needing to be added with fault setting, and automatically adding a fault switch element and grounding impedance at two ends of the power element; three-phase switches are added at two ends of a three-phase instantaneous, single-phase permanent and three-phase fault single-phase rejection element, single-phase instantaneous faults only need to add single-phase switches at two ends of a fault phase, and zero resistance is added at a non-fault phase; adding a single-phase or three-phase grounding switch at a fault position for the grounding fault, and adding a single-phase-to-phase fault switch at a fault position for the phase-to-phase fault; selecting whether to add single-phase or three-phase grounding impedance according to whether grounding impedance exists;
the electrical information measuring module is used for automatically adding an electrical information measuring unit of the power element so as to obtain the measuring information of the power element;
the fault logic setting module is used for setting fault type selection and fault time sequence setting logics and automatically configuring the setting and action time sequence of the fault switch according to the fault type selection and the fault time sequence setting;
the measuring information output module is used for setting selection logic for outputting the measuring information and automatically enabling the corresponding measuring information to be output according to the selection logic;
the fault element packaging module is used for packaging the power element, the fault switch, the grounding impedance and the measuring unit to form an independent composite fault element;
and the fault element replacement module is used for automatically shielding and replacing the existing power elements according to the setting of the composite fault element, completing the replacement one by one according to the sequence list of the composite fault element and completing automatic fault scanning.
6. The system according to claim 5, wherein the electrical information measurement unit comprises a voltmeter for measuring a voltage across the faulty component, an ammeter for measuring a current of the faulty component, a voltmeter for measuring a voltage at the fault point, an ammeter for measuring a current at the fault point, and a wattmeter for measuring a power of the faulty component.
7. An all-electromagnetic transient fault scanning compound fault element modeling system as claimed in claim 5, wherein said fault types include three-phase transient fault, single-phase permanent fault, three-phase fault single-phase rejection, two-phase-to-phase fault and two-phase ground fault; the fault time sequence comprises the tripping time of fault phase switches at two ends of a fault unit, reclosing time and the tripping time of three-phase switches at two ends of a fault element.
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