CN117371242A - Efficient electromagnetic transient simulation method, system, equipment and medium for power system - Google Patents
Efficient electromagnetic transient simulation method, system, equipment and medium for power system Download PDFInfo
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Abstract
The invention discloses a high-efficiency electromagnetic transient simulation method, system, equipment and medium for a power system, and belongs to the field of power system simulation. The simulation of the first signal response period is carried out on the power system according to a preset step length, whether an event occurs once is judged every time a preset step length is passed, and the dynamic change process of the power system is described as a series of events which occur according to a time sequence; if the power system at the current moment is in a steady state, directly taking the output response before a period at the moment as the output response at the moment; if the power system at the current moment is in a transient state and an event occurs, adopting small-step simulation to re-simulate and calculate the output response at the current moment. The invention combines event driving and electromagnetic transient simulation, automatically determines the simulation step length, omits unnecessary calculation process and improves the simulation efficiency. And the original signal is directly used for simulation calculation, so that the simulation precision is ensured.
Description
Technical Field
The invention relates to the field of power system simulation, in particular to a high-efficiency electromagnetic transient simulation method, system, equipment and medium of a power system.
Background
The permeability of new energy and power electronic equipment in a power system is higher and higher, and the power system evolves towards the 'double high' direction of high-proportion new energy power generation and high-proportion power electronic equipment. The double-high system has the characteristics of nonlinearity, time-varying property, multiple time scales and the like, and the electric signal is a broadband signal. Because of the large dynamic differences between the elements, the simulation steps are difficult to uniformly select. When in transient state, the signal response is aperiodic and small step simulation is needed. In steady state, the signal response has periodicity, if small step simulation is still adopted, the calculation of each period is completely the same, a large amount of calculation resources are occupied, and the simulation efficiency is reduced.
The multi-frequency electromagnetic transient simulation method with multi-frequency time scale transformation is one of the common methods for improving the electromagnetic transient simulation efficiency. The method divides the frequency of the broadband signal into a plurality of sub-frequency bands, the signals in each frequency band are recombined into a frequency band signal, and the frequency band signal can be regarded as a low-frequency signal after the rotation and the transformation of the signals in each frequency band, so that large-step simulation can be adopted, and the simulation speed is improved. However, the method can distort signals to different degrees in the process of signal decomposition, and the simulation precision is affected.
At present, in electromagnetic transient simulation of a double-high system, the following problems mainly exist:
1) The multi-frequency electromagnetic transient simulation method with multi-frequency time scale transformation can generate certain errors in the decomposition link of signals, and the simulation precision is reduced.
2) The existing simulation method does not distinguish between the steady state and the transient state of the system, signals periodically change when the system is steady, the calculation process is repeated, a large amount of calculation resources are occupied, and the simulation speed is reduced.
In summary, the existing simulation method generates errors when analyzing signals, does not distinguish transient and steady state conditions, and calculates repeated processes in steady state, so that calculation resources are occupied, and simulation precision and efficiency are affected.
Disclosure of Invention
The invention aims to provide a high-efficiency electromagnetic transient simulation method, a system, equipment and a medium for a power system, which can save computing resources and improve simulation efficiency.
In order to achieve the above object, the present invention provides the following solutions:
an efficient electromagnetic transient simulation method for an electric power system, comprising:
determining an excitation amount variation threshold of the input excitation;
simulating a first signal response period of the power system according to a preset step length, and obtaining output responses of a plurality of moments in the first signal response period;
initializing the value of i in i preset step sizes to be 1;
after i preset step sizes, judging whether the variation value of the excitation quantity at the current time T and the excitation quantity at the time T-T is larger than an excitation quantity variation threshold value or not, and obtaining a judging result; wherein T represents a signal response period at steady state, T > T >0;
if the judging result shows that the power system is in a steady state, judging that the power system is in a steady state, and taking the output response of the moment T-T as the output response of the current moment T;
if the judgment result shows that the power system is in a transient state, an event occurs, and the current time t is simulated according to a preset step length to obtain an output response of the current time t;
and (3) increasing the value of i by 1, and returning to the step (after i preset step sizes are passed), judging whether the variation of the input excitation at the current time T and the input excitation at the time T-T is larger than a variation threshold value, so as to obtain a judgment result.
A high efficiency electromagnetic transient simulation system for an electrical power system, comprising:
a change threshold determination module for determining an excitation amount change threshold of the input excitation;
the simulation module is used for simulating a first signal response period of the power system according to a preset step length to obtain output responses at a plurality of moments in the first signal response period;
the initialization module is used for initializing the numerical value of i in i preset step sizes to be 1;
the judging module is used for judging whether the variation value of the excitation quantity at the current moment T and the excitation quantity at the moment T-T is larger than an excitation quantity variation threshold value after i preset step sizes, and obtaining a judging result; wherein T represents a signal response period at steady state, T > T >0;
the steady state judging module is used for judging that the power system is in a steady state if the judging result indicates no, and taking the output response of the moment T-T as the output response of the current moment T;
the transient state judging module is used for judging that the power system is in a transient state if the judging result shows that the power system is in a transient state, generating an event, and simulating the current time t according to a preset step length to obtain an output response of the current time t;
and the circulation module is used for increasing the value of i by 1 and calling the judgment module.
An electronic device comprising a memory, a processor and a computer program stored on the memory and executable on the processor, the processor implementing an efficient electromagnetic transient simulation method of a power system as described above when executing the computer program.
A computer readable storage medium having stored thereon a computer program which when executed implements a highly efficient electromagnetic transient simulation method of a power system as described above.
According to the specific embodiment provided by the invention, the invention discloses the following technical effects:
according to the high-efficiency electromagnetic transient simulation method, system, equipment and medium for the power system, the simulation of the first signal response period is started to the power system according to the preset step length, whether an event occurs once is judged every time a preset step length is passed, and the dynamic change process of the power system is described as a series of events which occur according to the time sequence; if the power system at the current moment is in a steady state, the current moment is not required to be simulated, and the output response before a period at the moment is directly used as the output response at the moment; if the power system at the current moment is in a transient state and an event occurs, adopting small-step simulation to re-simulate and calculate the output response at the current moment. The invention combines event driving and electromagnetic transient simulation, automatically determines the simulation step length, omits unnecessary calculation process and improves the simulation efficiency. And the original signal is directly used for simulation calculation, so that the simulation precision is ensured.
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In order to more clearly illustrate the embodiments of the present invention or the technical solutions of the prior art, the drawings that are needed in the embodiments will be briefly described below, it being obvious that the drawings in the following description are only some embodiments of the present invention, and that other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.
Fig. 1 is a flowchart of a high-efficiency electromagnetic transient simulation method of a power system according to an embodiment of the present invention;
fig. 2 is a schematic diagram of a high-efficiency electromagnetic transient simulation method of a power system according to an embodiment of the present invention.
Detailed Description
The following description of the embodiments of the present invention will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present invention, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
In the background of a novel power system, the modeling and simulation of the large-scale alternating current/direct current power grid has the characteristic of multiple time scales. The traditional electromagnetic transient simulation method adopts a detailed model and a small step length, has low simulation speed, and needs a large amount of calculation resources no matter the system is in a steady state or a transient state. In order to solve the problems, the invention provides a high-efficiency electromagnetic transient simulation method of a power system based on event driving, which can save repeated electromagnetic transient simulation calculation process, save calculation resources and improve simulation efficiency on the premise of not sacrificing precision.
In order that the above-recited objects, features and advantages of the present invention will become more readily apparent, a more particular description of the invention will be rendered by reference to the appended drawings and appended detailed description.
As shown in fig. 1, an embodiment of the present invention provides a method for efficient electromagnetic transient simulation of a power system, including:
step 1: an excitation amount variation threshold of the input excitation is determined.
The response of an electric power system is determined by the input stimulus and the initial state of the system, and the preset step size of the electric power system is set as deltat. And in the steady state, setting the signal response period in the steady state as T. When the input stimulus and the initial state are unchanged and the structure of the system is unchanged compared with the T-T moment, the output response value at the T moment and the output response value at the T-T moment before a period should be the same. Thus, the dynamic change process of the power system can be described as a series of events occurring in time series, and the excitation amount change threshold of the input excitation is specified according to the actual situation (error requirement).
At least one of the excitation amounts of the excitation is inputted. When the excitation amount of the input excitation is plural, the number of the excitation amount variation threshold is plural. That is, one excitation amount variation threshold is set for each excitation amount. The excitation amount may be voltage, current, or the like.
The power system is a power system containing high-proportion new energy and high-proportion power electronic devices of broadband non-periodic signals.
Step 2: and simulating a first signal response period of the power system according to a preset step length, and obtaining output responses of a plurality of moments in the first signal response period.
Referring to fig. 2, in the first signal response period, a preset step size is used as a simulation step size, and small step size simulation is performed on the first signal response period. The signal response period T at steady state is an integer multiple of the preset step length, so that the last moment in the first signal response period also has an output response.
Step 3: initializing the value of i in i preset step sizes to be 1.
Step 4: after i preset step sizes, judging whether the variation value of the excitation quantity at the current time T and the excitation quantity at the time T-T is larger than an excitation quantity variation threshold value or not, and obtaining a judging result; where T represents the signal response period at steady state, T >0.
When the value of i is 1, t+Δt is the current time T, which is within the second signal response period, followed by determining the output response of the second signal response period.
When the value of i is greater than 1 and the current time t is in or after the third signal response period, an output response is determined for the third signal response period or for periods after the third signal response period.
Comparing the excitation quantity at the current time T with the excitation quantity at the time T-T, judging whether the change value exceeds the set excitation quantity change threshold value, and obtaining a judgment result.
When the excitation amount of the input excitation is a plurality of, the number of the excitation amount change thresholds is a plurality of, and the judging method specifically comprises the following steps:
if the variation values of all excitation amounts at the current time T and the respective excitation amounts at the time T-T are smaller than or equal to the excitation amount variation threshold value, the judgment result indicates no; and if the variation value of at least one excitation quantity in all excitation quantities at the current time T and the excitation quantity at the time T-T is larger than the excitation quantity variation threshold value, the judgment result shows yes.
The simulation step size will be automatically determined according to the system input quantity threshold value.
Step 5: if the judging result shows that the power system is in a steady state, the output response at the moment T-T is taken as the output response at the current moment T.
When the excitation quantity at the current time T is compared with the excitation quantity at the time T-T, the change value does not exceed the set excitation quantity change threshold, the input excitation is approximately considered to be unchanged, the system is in a steady state, no event occurs, and the output response of the system at the current time T is equal to the output response at the time T-T. At this time, simulation calculation is not needed, and a simulation result (output response) of the moment T-T can be directly output to serve as the output response of the current moment T, namely, large-step simulation.
Step 6: if the judgment result shows that the power system is in a transient state, an event is judged, and the current time t is simulated according to a preset step length to obtain the output response of the current time t.
If the excitation quantity at the current time T is compared with the excitation quantity at the time T-T, and the change value exceeds the set excitation quantity change threshold, the input excitation is considered to be changed, the system is in a transient state, and an event occurs, at the moment, the power system adopts small step simulation, and the output response at the current time T is calculated through re-simulation according to the preset step delta T.
The method for calculating the output response by small step size simulation is an existing method, and can be seen from the description of section 1.2.2.2 of the general power electronic real-time simulation method research and application, and the author is Xu Jin.
If the structural state in the power system at the current moment t is changed, an event is considered to occur, small step simulation is adopted, and the output response at the current moment t is recalculated according to the preset step delta t.
The present invention has previously known the moment of change of the power system structure.
Step 7: the value of i is incremented by 1 and step 4 is returned.
Referring to fig. 2, the method of the present invention is briefly as follows:
(1) a small step simulation is used in the first period of the simulation.
(2) From the second cycle, a determination is made as to whether an event has occurred in the system.
(3) If an event occurs, small step simulation is still adopted, and a simulation output result is recalculated. If the system does not have an event, large step simulation is adopted, and the output response before the moment and a period is taken as the output response at the moment.
(4) And (3) judging whether an event occurs in the next step length, and repeating the step (3) until the simulation is finished (the simulation duration is reached).
Therefore, in the electromagnetic transient simulation of the 'double-high' system, whether an event occurs or not is judged according to the input signal, so that the simulation step length is automatically adjusted, unnecessary calculation steps are omitted, and the efficient electromagnetic transient simulation is realized.
The invention describes the dynamic change process of the system as a series of 'events' which occur in time sequence based on event driving, and automatically determines the simulation step size according to whether the event occurs in the system or not. The invention directly uses the original signal to calculate the simulation, omits repeated calculation process, saves calculation resources, improves the simulation efficiency, and has little influence on the simulation precision.
The method has the advantages that:
1. the electromagnetic transient simulation process based on event driving does not perform transformation calculation on signals, has no calculation error, and hardly influences simulation precision while improving simulation efficiency.
2. The event driving and the electromagnetic transient simulation are combined, whether the system adopts large-step simulation is judged according to whether the event occurs, automatic determination of simulation step length is realized, unnecessary calculation process is omitted, and simulation efficiency is improved.
In order to execute the method corresponding to the above embodiment to achieve the corresponding functions and technical effects, the following provides a high-efficiency electromagnetic transient simulation system of an electric power system, which includes:
and the change threshold determining module is used for determining an excitation quantity change threshold of the input excitation.
And the simulation module is used for simulating a first signal response period of the power system according to a preset step length to obtain output responses at a plurality of moments in the first signal response period.
The initialization module is used for initializing the numerical value of i in i preset step sizes to be 1.
The judging module is used for judging whether the variation value of the excitation quantity at the current moment T and the excitation quantity at the moment T-T is larger than an excitation quantity variation threshold value after i preset step sizes, and obtaining a judging result; where T represents the signal response period at steady state, T >0.
And the steady state judging module is used for judging that the power system is in a steady state if the judging result indicates no, and taking the output response of the moment T-T as the output response of the current moment T.
And the transient state judging module is used for judging that the power system is in a transient state if the judging result shows yes, generating an event, and simulating the current time t according to a preset step length to obtain an output response of the current time t.
And the circulation module is used for increasing the value of i by 1 and calling the judgment module.
The working principle and the beneficial effects of the high-efficiency electromagnetic transient simulation system of the power system provided by the embodiment of the invention are similar to those of the high-efficiency electromagnetic transient simulation method of the power system described in the embodiment, so that details are not described herein, and specific contents can be referred to the description of the embodiment of the method.
The invention also provides an electronic device comprising a memory, a processor and a computer program stored on the memory and capable of running on the processor, wherein the processor realizes the efficient electromagnetic transient simulation method of the electric power system when executing the computer program.
Furthermore, the computer program in the above-described memory may be stored in a computer-readable storage medium when it is implemented in the form of a software functional unit and sold or used as a separate product. Based on this understanding, the technical solution of the present invention may be embodied essentially or in a part contributing to the prior art or in the form of a software product stored in a storage medium, comprising several instructions for causing a computer device (which may be a personal computer, a server or a network device, etc.) to perform all or part of the steps of the method according to the embodiments of the present invention. And the aforementioned storage medium includes: various media capable of storing program codes, such as a U disk, a mobile hard disk, a read-only memory, a random access memory, a magnetic disk or an optical disk.
Further, the present invention also provides a computer readable storage medium having stored thereon a computer program which when executed implements a high-efficiency electromagnetic transient simulation method of an electric power system as described above.
In the present specification, each embodiment is described in a progressive manner, and each embodiment is mainly described in a different point from other embodiments, and identical and similar parts between the embodiments are all enough to refer to each other.
The principles and embodiments of the present invention have been described herein with reference to specific examples, the description of which is intended only to assist in understanding the methods of the present invention and the core ideas thereof; also, it is within the scope of the present invention to be modified by those of ordinary skill in the art in light of the present teachings. In view of the foregoing, this description should not be construed as limiting the invention.
Claims (7)
1. The high-efficiency electromagnetic transient simulation method for the power system is characterized by comprising the following steps of:
determining an excitation amount variation threshold of the input excitation;
simulating a first signal response period of the power system according to a preset step length, and obtaining output responses of a plurality of moments in the first signal response period;
initializing the value of i in i preset step sizes to be 1;
after i preset step sizes, judging whether the variation value of the excitation quantity at the current time T and the excitation quantity at the time T-T is larger than an excitation quantity variation threshold value or not, and obtaining a judging result; wherein T represents a signal response period at steady state, T > T >0;
if the judging result shows that the power system is in a steady state, judging that the power system is in a steady state, and taking the output response of the moment T-T as the output response of the current moment T;
if the judgment result shows that the power system is in a transient state, an event occurs, and the current time t is simulated according to a preset step length to obtain an output response of the current time t;
and (3) increasing the value of i by 1, and returning to the step (after i preset step sizes are passed), judging whether the variation value of the excitation quantity at the current time T and the excitation quantity at the time T-T is larger than the excitation quantity variation threshold value or not, so as to obtain a judgment result.
2. The efficient electromagnetic transient simulation method of a power system according to claim 1, wherein when the excitation amount of the input excitation is plural, the number of excitation amount variation thresholds is plural.
3. The method for efficient electromagnetic transient simulation of a power system according to claim 2, wherein determining whether a variation value of an excitation amount at a current time T and an excitation amount at a time T-T is greater than an excitation amount variation threshold value, to obtain a determination result, specifically comprises:
if the variation values of all excitation amounts at the current time T and the respective excitation amounts at the time T-T are smaller than or equal to the excitation amount variation threshold value, the judgment result indicates no;
and if the variation value of at least one excitation quantity in all excitation quantities at the current time T and the excitation quantity at the time T-T is larger than the excitation quantity variation threshold value, the judgment result shows yes.
4. The method for efficient electromagnetic transient simulation of a power system of claim 1, further comprising, after i preset steps:
if the state of the structure in the power system at the current moment t is changed, judging that an event occurs, and simulating the current moment t according to a preset step length to obtain the output response of the current moment t.
5. An efficient electromagnetic transient simulation system for an electrical power system, comprising:
a change threshold determination module for determining an excitation amount change threshold of the input excitation;
the simulation module is used for simulating a first signal response period of the power system according to a preset step length to obtain output responses at a plurality of moments in the first signal response period;
the initialization module is used for initializing the numerical value of i in i preset step sizes to be 1;
the judging module is used for judging whether the variation value of the excitation quantity at the current moment T and the excitation quantity at the moment T-T is larger than an excitation quantity variation threshold value after i preset step sizes, and obtaining a judging result; wherein T represents a signal response period at steady state, T > T >0;
the steady state judging module is used for judging that the power system is in a steady state if the judging result indicates no, and taking the output response of the moment T-T as the output response of the current moment T;
the transient state judging module is used for judging that the power system is in a transient state if the judging result shows that the power system is in a transient state, generating an event, and simulating the current time t according to a preset step length to obtain an output response of the current time t;
and the circulation module is used for increasing the value of i by 1 and calling the judgment module.
6. An electronic device comprising a memory, a processor and a computer program stored on the memory and executable on the processor, the processor implementing the efficient electromagnetic transient simulation method of the power system of any of claims 1-4 when the computer program is executed.
7. A computer readable storage medium, characterized in that it has stored thereon a computer program which, when executed, implements the efficient electromagnetic transient simulation method of an electrical power system according to any of claims 1 to 4.
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