A hybrid simulation method and apparatus for electromechanical and electromagnetic transients

Abstract

This invention provides a method and apparatus for hybrid simulation processing of electromechanical and electromagnetic transients. The method includes: acquiring three-phase AC current output from the electromagnetic transient side; converting the three-phase AC current into a single-phase positive-sequence current used for simulation of the electromechanical transient side using a frequency shift transform; sending the single-phase positive-sequence current to the electromechanical transient side for simulation processing to obtain first simulation processing data; acquiring the single-phase positive-sequence current output from the electromechanical transient side; converting the single-phase positive-sequence current into a three-phase AC current used for simulation of the electromagnetic transient side using an inverse frequency shift transform; sending the three-phase AC current to the electromagnetic transient side for simulation processing to obtain second simulation processing data; and determining the stability analysis results of the power transmission and distribution system network based on the first and second simulation processing data. The method provided by this invention effectively improves the accuracy and efficiency of hybrid simulation of electromechanical and electromagnetic transients.

Description

Technical Field

[0001] This invention relates to the field of power transmission and distribution network management technology, and in particular to a method and apparatus for hybrid simulation processing of electromechanical and electromagnetic transients. It also relates to an electronic device, a non-transient computer-readable storage medium, and a computer program product. Background Technology

[0002] In recent years, with the increasing integration of distributed renewable energy into distribution networks, the interactions between transmission and distribution systems have become more frequent and complex, making network stability increasingly crucial. In traditional power system analysis, transmission and distribution networks are modeled and analyzed separately. Transmission networks are typically analyzed using electromechanical transient simulation programs, while distribution networks are usually analyzed using electromagnetic transient simulation programs, simplifying their interaction. To better study the impact of distributed renewable energy altering the traditional unidirectional power flow characteristics of distribution networks and consequently on transmission networks, hybrid electromechanical-electromagnetic transient simulation analysis is needed to determine the stability of transmission and distribution networks. Since electromechanical and electromagnetic transient simulations differ in simulation step size and signal types, achieving hybrid electromechanical-electromagnetic transient simulation analysis has become a current research focus, requiring an understanding of the signal processing and data interaction processes between the two. Existing hybrid electromechanical-electromagnetic transient simulation methods typically employ dynamic phasor methods; however, as the timescale of the system's dynamic processes expands, the number of dynamic phasor equations increases dramatically, leading to a decrease in computational efficiency. Meanwhile, due to the coupling between transient processes at different time scales, completely decoupling the dynamic phasor equations at different frequencies will result in significant simulation errors. Therefore, designing a more efficient hybrid electromechanical and electromagnetic transient simulation method to achieve rapid analysis of the stability of power transmission and distribution network has become an urgent technical problem to be solved. Summary of the Invention

[0003] This invention provides a hybrid simulation processing method combining electromechanical and electromagnetic transients to address the shortcomings of existing power transmission and distribution system network simulation processing schemes, which have high limitations and result in poor actual processing efficiency and accuracy.

[0004] This invention provides a hybrid simulation processing method for electromechanical and electromagnetic transients, comprising:

[0005] The three-phase AC current output from the electromagnetic transient side is obtained, and the three-phase AC current is converted into a single-phase positive sequence current used for electromechanical transient side simulation by frequency shifting transformation. The single-phase positive sequence current is then sent to the electromechanical transient side for simulation processing to obtain the first simulation processing data.

[0006] The electromagnetic transient side is an electromagnetic transient simulation module corresponding to the power transmission system network in the power transmission and distribution system network, and the electromechanical transient side is an electromechanical transient simulation module corresponding to the power distribution system network in the power transmission and distribution system network.

[0007] The single-phase positive sequence current output from the electromechanical transient side is obtained, and the single-phase positive sequence current is converted into a three-phase AC current used for electromagnetic transient side simulation by frequency shifting inverse transformation. The three-phase AC current is then sent to the electromagnetic transient side for simulation processing to obtain the second simulation processing data.

[0008] Based on the first simulation data and the second simulation data, the stability analysis results of the power transmission and distribution system network are determined.

[0009] According to the electromechanical and electromagnetic transient hybrid simulation processing method provided by the present invention, the step of converting the three-phase AC current into a single-phase positive-sequence current used for electromechanical transient side simulation by using frequency shift transformation specifically includes: determining the analytical signal corresponding to the three-phase AC current; performing frequency shift transformation processing on the spectrum of the analytical signal to obtain a complex envelope signal obtained after frequency shift transformation; and converting the complex envelope signal obtained after frequency shift transformation into a single-phase positive-sequence signal.

[0010] According to the electromechanical and electromagnetic transient hybrid simulation processing method provided by the present invention, the step of converting the single-phase positive sequence current into a three-phase AC current used for electromagnetic transient side simulation by using frequency shift inverse transformation specifically includes: converting the single-phase positive sequence current into an initial three-phase AC signal, performing frequency shift inverse transformation processing on the initial three-phase AC signal, and obtaining a three-phase AC current used for electromagnetic transient side simulation processing.

[0011] According to the electromechanical and electromagnetic transient hybrid simulation processing method provided by the present invention, the step of determining the stability analysis result of the power transmission and distribution system network based on the first simulation processing data and the second simulation processing data specifically includes:

[0012] It is determined whether the curve data of various attributes in the first simulation processing data exceed the corresponding first threshold. If the curve data of various attributes in the first simulation processing data do not exceed the corresponding first threshold, the stability analysis result of the power transmission system network is determined to meet the target condition. The curve data of various attributes in the first simulation processing data includes the first voltage change curve data, the first current change curve data, and the first power change curve data.

[0013] It is determined whether the curve data of various attributes in the second simulation processing data exceed the corresponding second threshold. If the curve data of various attributes in the second simulation processing data do not exceed the corresponding second threshold, the stability analysis result of the power distribution system network is determined to meet the target condition. The curve data of various attributes in the second simulation processing data includes the second voltage change curve data, the second current change curve data, and the second power change curve data.

[0014] The first simulation processing data includes first voltage change curve data, first current change curve data, and first power change curve data corresponding to the transmission system network in the power transmission and distribution system network; the second simulation processing data includes second voltage change curve data, second current change curve data, and second power change curve data corresponding to the distribution system network in the power transmission and distribution system network.

[0015] The electromechanical and electromagnetic transient hybrid simulation processing method provided by the present invention further includes: acquiring interference or fault events input into the power transmission and distribution system network;

[0016] Based on a preset data timing interaction strategy, the data interaction during the hybrid simulation process of the electromechanical transient side and the electromagnetic transient side is processed to obtain hybrid simulation processing data. The data timing interaction strategy is a combination of parallel simulation processing and serial simulation processing. When the interference or fault event occurs, the electromechanical transient side and the electromagnetic transient side adopt serial simulation processing operation, and when the interference or fault event does not occur, the electromechanical transient side and the electromagnetic transient side adopt parallel simulation processing operation.

[0017] According to the electromechanical and electromagnetic transient hybrid simulation processing method provided by the present invention, the step of processing the data interaction during the hybrid simulation processing of the electromechanical transient side and the electromagnetic transient side to obtain hybrid simulation processing data includes: sending the single-phase positive sequence current to the electromechanical transient side for simulation processing to obtain first simulation processing data; and sending the three-phase alternating current to the electromagnetic transient side for simulation processing to obtain second simulation processing data.

[0018] The present invention also provides a hybrid simulation processing device for electromechanical and electromagnetic transients, comprising:

[0019] A frequency shift conversion processing unit is used to acquire the three-phase AC current output from the electromagnetic transient side, convert the three-phase AC current into a single-phase positive-sequence current used for electromechanical transient side simulation using a frequency shift conversion method, and send the single-phase positive-sequence current to the electromechanical transient side for simulation processing to obtain the first simulation processing data; wherein, the electromagnetic transient side is an electromagnetic transient simulation module corresponding to the transmission system network in the power transmission and distribution system network, and the electromechanical transient side is an electromechanical transient simulation module corresponding to the distribution system network in the power transmission and distribution system network;

[0020] The frequency shift inverse transformation processing unit is used to acquire the single-phase positive sequence current output from the electromechanical transient side, convert the single-phase positive sequence current into a three-phase AC current used for electromagnetic transient side simulation using the frequency shift inverse transformation method, and send the three-phase AC current to the electromagnetic transient side for simulation processing to obtain the second simulation processing data.

[0021] The simulation processing and analysis unit is used to determine the stability analysis results of the power transmission and distribution system network based on the first simulation processing data and the second simulation processing data.

[0022] According to the electromechanical and electromagnetic transient hybrid simulation processing device provided by the present invention, the frequency shift transformation processing unit is specifically used for: determining the analytical signal corresponding to the three-phase AC current, performing frequency shift transformation processing on the spectrum of the analytical signal to obtain the complex envelope signal obtained after frequency shift transformation; and converting the complex envelope signal obtained after frequency shift transformation into a single-phase positive sequence signal.

[0023] According to the electromechanical and electromagnetic transient hybrid simulation processing device provided by the present invention, the frequency shift inverse transformation processing unit is specifically used to: convert the single-phase positive sequence current into an initial three-phase AC signal, perform frequency shift inverse transformation processing on the initial three-phase AC signal, and obtain a three-phase AC current used for electromagnetic transient side simulation processing.

[0024] According to the electromechanical and electromagnetic transient hybrid simulation processing device provided by the present invention, the simulation processing and analysis unit is specifically used for:

[0025] It is determined whether the curve data of various attributes in the first simulation processing data exceed the corresponding first threshold. If the curve data of various attributes in the first simulation processing data do not exceed the corresponding first threshold, the stability analysis result of the power transmission system network is determined to meet the target condition. The curve data of various attributes in the first simulation processing data includes the first voltage change curve data, the first current change curve data, and the first power change curve data.

[0026] It is determined whether the curve data of various attributes in the second simulation processing data exceed the corresponding second threshold. If the curve data of various attributes in the second simulation processing data do not exceed the corresponding second threshold, the stability analysis result of the power distribution system network is determined to meet the target condition. The curve data of various attributes in the second simulation processing data includes the second voltage change curve data, the second current change curve data, and the second power change curve data.

[0027] The first simulation processing data includes first voltage change curve data, first current change curve data, and first power change curve data corresponding to the transmission system network in the power transmission and distribution system network; the second simulation processing data includes second voltage change curve data, second current change curve data, and second power change curve data corresponding to the distribution system network in the power transmission and distribution system network.

[0028] The electromechanical and electromagnetic transient hybrid simulation processing device provided by the present invention further includes:

[0029] Data timing interaction control unit, used for:

[0030] Acquire interference or fault events input into the power transmission and distribution system network;

[0031] Based on a preset data timing interaction strategy, the data interaction during the hybrid simulation process of the electromechanical transient side and the electromagnetic transient side is processed to obtain hybrid simulation processing data. The data timing interaction strategy is a combination of parallel simulation processing and serial simulation processing. When the interference or fault event occurs, the electromechanical transient side and the electromagnetic transient side adopt serial simulation processing operation, and when the interference or fault event does not occur, the electromechanical transient side and the electromagnetic transient side adopt parallel simulation processing operation.

[0032] According to the electromechanical and electromagnetic transient hybrid simulation processing device provided by the present invention, the step of processing the data interaction during the hybrid simulation processing of the electromechanical transient side and the electromagnetic transient side to obtain hybrid simulation processing data includes: sending the single-phase positive sequence current to the electromechanical transient side for simulation processing to obtain first simulation processing data; and sending the three-phase alternating current to the electromagnetic transient side for simulation processing to obtain second simulation processing data.

[0033] The present invention also provides an electronic device, including a memory, a processor, and a computer program stored in the memory and executable on the processor, wherein the processor executes the program to implement the electromechanical and electromagnetic transient hybrid simulation processing method as described in any of the preceding claims.

[0034] The present invention also provides a non-transitory computer-readable storage medium having a computer program stored thereon, wherein the computer program, when executed by a processor, implements the electromechanical and electromagnetic transient hybrid simulation processing method as described in any of the preceding claims.

[0035] The present invention also provides a computer program product, including a computer program that, when executed by a processor, implements the electromechanical and electromagnetic transient hybrid simulation processing method as described in any of the preceding claims.

[0036] The electromechanical and electromagnetic transient hybrid simulation processing method provided by this invention obtains the three-phase AC current output from the electromagnetic transient side, converts the three-phase AC current into a single-phase positive-sequence current used for electromechanical transient side simulation using frequency shift transformation, and sends the single-phase positive-sequence current to the electromechanical transient side for simulation processing to obtain first simulation processing data; obtains the single-phase positive-sequence current output from the electromechanical transient side, converts the single-phase positive-sequence current into a three-phase AC current used for electromagnetic transient side simulation using inverse frequency shift transformation, and sends the three-phase AC current to the electromagnetic transient side for simulation processing to obtain second simulation processing data; and determines the stability analysis results of the power transmission and distribution system network based on the first and second simulation processing data. This method can realize hybrid simulation between the electromechanical transient side and the electromagnetic transient side with different simulation step sizes, effectively improving the accuracy and efficiency of electromechanical and electromagnetic transient hybrid simulation, thereby enhancing the accuracy and efficiency of stability analysis of the power transmission and distribution system network. Attached Figure Description

[0037] To more clearly illustrate the technical solutions in this invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of this invention. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0038] Figure 1 This is a flowchart illustrating the electromechanical and electromagnetic transient hybrid simulation processing method provided by the present invention.

[0039] Figure 2 This is a schematic diagram of the equivalent representation of an electromagnetic transient network using a Norton circuit, provided by the present invention.

[0040] Figure 3 This is a schematic diagram of the equivalent representation of electromechanical transient networks using Norton circuits provided by the present invention.

[0041] Figure 4 This is a schematic diagram of the data timing interaction strategy provided by the present invention.

[0042] Figure 5This is a schematic diagram of the structure of the electromechanical and electromagnetic transient hybrid simulation processing device provided by the present invention.

[0043] Figure 6 This is a schematic diagram of the structure of the electronic device provided by the present invention. Detailed Implementation

[0044] To make the objectives, technical solutions, and advantages of this invention clearer, the technical solutions of this invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of this invention. All other embodiments obtained by those skilled in the art based on the embodiments of this invention without creative effort are within the scope of protection of this invention.

[0045] The following is combined with Figures 1-6 The present invention describes the electromechanical and electromagnetic transient hybrid simulation processing method and apparatus, and provides a detailed description of its embodiments.

[0046] The following is a detailed description of embodiments of the electromechanical and electromagnetic transient hybrid simulation processing method described in this invention. For example... Figure 1 As shown, this is one of the flowcharts of the electromechanical and electromagnetic transient hybrid simulation processing method provided by the present invention. The specific implementation process includes the following steps:

[0047] Step 101: Obtain the three-phase AC current output from the electromagnetic transient side, convert the three-phase AC current into a single-phase positive-sequence current used for electromechanical transient side simulation using frequency shift conversion, and send the single-phase positive-sequence current to the electromechanical transient side for simulation processing to obtain the first simulation processing data. Here, the electromagnetic transient side is the electromagnetic transient simulation module (i.e., electromagnetic transient simulation program or electromagnetic transient simulation tool) corresponding to the transmission system network in the power transmission and distribution system network, and the electromechanical transient side is the electromechanical transient simulation module (i.e., electromechanical transient simulation program or electromechanical transient simulation tool) corresponding to the distribution system network in the power transmission and distribution system network.

[0048] Because variables in electromechanical transient simulation are represented using single-phase fundamental phasors, while electromagnetic transient simulation uses three-phase instantaneous values, a data format conversion between the electromechanical and electromagnetic transient hybrid simulations is required. Therefore, in this embodiment of the invention, during the hybrid simulation interaction between the electromagnetic and electromechanical transient sides, the three-phase AC current output from the electromagnetic transient side is first acquired, and then converted into a single-phase positive-sequence current used in the electromechanical transient simulation using a frequency-shift transform. By determining the analytical signal corresponding to the three-phase AC current, a frequency-shift transform is performed on the spectrum of the analytical signal to obtain a complex envelope signal after the frequency-shift transform; this complex envelope signal is then converted into a single-phase positive-sequence signal.

[0049] In electromagnetic transient simulations, electromechanical transient networks are typically large-scale and active systems, with parameters that approximate linear relationships. Therefore, to improve the numerical stability of these networks, Norton equivalent circuits can be used to represent them in electromagnetic transient simulations. Specifically, for example... Figure 2 As shown. Figure 2 middle Here is the short-circuit impedance corresponding to the electromechanical transient network, where R This is the real part of the short-circuit impedance, i.e., the equivalent resistance; This represents the imaginary part of the short-circuit impedance and the equivalent reactance. This is the input single-phase positive sequence signal.

[0050] In electromechanical transient simulation, due to limitations of most electromechanical transient simulation programs or tool interfaces, electromagnetic transient networks can be represented as Norton equivalent circuits. To achieve hybrid electromechanical-electromagnetic transient simulation based on frequency shift transform, this invention, in the electromagnetic transient simulation, uses Norton equivalent circuits to represent the electromagnetic transient network to improve its numerical stability. Specifically, as shown below... Figure 3 As shown. Figure 3 middle Here is the short-circuit impedance corresponding to the electromagnetic transient network, where R This is the real part of the short-circuit impedance, i.e., the equivalent resistance; This is the imaginary part of the short-circuit impedance, i.e., the equivalent reactance; The signal is the input three-phase alternating current.

[0051] In this embodiment of the invention, during the electromechanical transient side simulation, a frequency shift transformation method is used to convert the three-phase AC current output from the electromagnetic transient side into a single-phase positive-sequence current. Specifically, the three-phase AC current in the electromagnetic transient side simulation can be represented by a center frequency of... bandpass signal This type of bandpass signal has a spectrum containing both symmetrical positive and negative frequency components. To obtain a signal containing only positive frequency components, the following analytic signal is constructed. :

[0052] ;

[0053] Where t is time, The imaginary part is , To and The corresponding imaginary adjoint signal can be constructed based on differential transformation.

[0054] ;

[0055] Among them, for After performing a differential transformation, we can obtain ; , Given the frequency shift, the angular frequency can be obtained. .

[0056] The above analytical signal Shift the spectrum to the left (i.e., frequency shifting), let Complex envelope signals with frequencies concentrated around 0 Hz can be obtained. The shift of the spectrum in the time domain can be expressed as:

[0057] ;

[0058] After frequency shift transformation, a complex envelope signal is obtained. This complex envelope signal is a low-pass signal with a frequency near 0 Hz, and its maximum frequency is much smaller than that of the original real signal. According to the Nyquist sampling theorem, compared with the original bandpass signal, the envelope signal obtained after frequency shift transformation can be simulated with a larger time step, which meets the requirements of electromechanical transient simulation.

[0059] The complex envelope signal obtained after frequency shift transform processing Transformation into single-phase positive sequence signal This can be used for simulation processing of electromechanical transients. The specific transformation process is as follows:

[0060] ;

[0061] in, , The vector deviation is 120 degrees, and e is the natural exponent. j The imaginary number is the unit. They are respectively from The single-phase positive-sequence, negative-sequence, and zero-sequence components are obtained after matrix transformation. Take... Complex envelope signal can be obtained The single-phase positive sequence component, i.e., the component of the three-phase AC signal. After frequency shifting, the single-phase positive sequence signal is suitable for electromechanical transient simulation. .

[0062] Step 102: Obtain the single-phase positive sequence current output from the electromechanical transient side, convert the single-phase positive sequence current into a three-phase AC current used for electromagnetic transient side simulation using frequency shift inverse transformation, and send the three-phase AC current to the electromagnetic transient side for simulation processing to obtain the second simulation processing data.

[0063] In this embodiment of the invention, the single-phase positive sequence current output from the electromechanical transient side is first obtained, and then the single-phase positive sequence current is converted into an initial three-phase AC signal. The initial three-phase AC signal is subjected to frequency shift inverse transformation processing to obtain a three-phase AC current used for electromagnetic transient side simulation processing.

[0064] When performing electromagnetic transient simulation, it is necessary to process the single-phase positive sequence current output from the electromechanical transient side. Converted to the three-phase AC current required for electromagnetic transient side simulation calculation .

[0065] By converting the single-phase positive-sequence current into a three-phase AC signal and then performing an inverse frequency shift transform, the three-phase AC current used for electromagnetic side simulation calculations can be obtained. The specific conversion and inverse frequency shift transform process is as follows:

[0066] ;

[0067] Based on the different system characteristics of the electromechanical transient side and the electromagnetic transient side, this invention establishes equivalent circuits for the hybrid simulation interface, and realizes the conversion and interaction of data between the electromechanical transient side and the electromagnetic transient side based on the frequency shift transformation method, which effectively improves the efficiency of hybrid simulation data interaction processing.

[0068] Step 103: Determine the stability analysis results of the power transmission and distribution system network based on the first simulation processing data and the second simulation processing data.

[0069] In this embodiment of the invention, by determining whether the curve data of various attributes in the first simulation processing data exceed the corresponding first threshold, if the curve data of various attributes in the first simulation processing data do not exceed the corresponding first threshold, the stability analysis result corresponding to the power transmission system network is determined to meet the target condition. The curve data of various attributes in the first simulation processing data includes first voltage change curve data, first current change curve data, and first power change curve data. The first threshold may include voltage change threshold, current change threshold, and power change threshold respectively corresponding to the first voltage change curve data, first current change curve data, and first power change curve data.

[0070] By determining whether the curve data of various attributes in the second simulation processing data exceed the corresponding second threshold, if the curve data of various attributes in the second simulation processing data do not exceed the corresponding second threshold, the stability analysis result corresponding to the distribution system network is determined to meet the target condition. The curve data of various attributes in the second simulation processing data includes second voltage change curve data, second current change curve data, and second power change curve data. The second threshold may include voltage change threshold, current change threshold, and power change threshold corresponding to the second voltage change curve data, second current change curve data, and second power change curve data, respectively. The first simulation processing data includes first voltage change curve data, first current change curve data, and first power change curve data corresponding to the transmission system network in the transmission and distribution system network; the second simulation processing data includes second voltage change curve data, second current change curve data, and second power change curve data corresponding to the distribution system network in the transmission and distribution system network.

[0071] Furthermore, this invention can obtain hybrid simulation processing data by acquiring interference or fault events input into the power transmission and distribution system network and processing the data interaction during the hybrid simulation process of the electromechanical transient side and the electromagnetic transient side based on a preset data timing interaction strategy. The data timing interaction strategy is a combination of parallel and serial simulation processing. When the interference or fault event occurs, the electromechanical transient side and the electromagnetic transient side use serial simulation processing operations; when the interference or fault event does not occur, the electromechanical transient side and the electromagnetic transient side use parallel simulation processing operations. The processing of the data interaction during the hybrid simulation process of the electromechanical transient side and the electromagnetic transient side to obtain hybrid simulation processing data includes: sending the single-phase positive-sequence current to the electromechanical transient side for simulation processing to obtain first simulation processing data; and sending the three-phase AC current to the electromagnetic transient side for simulation processing to obtain second simulation processing data.

[0072] It should be noted that because the simulation step size for the electromechanical transient side is relatively large, such as calculating once every 0.02s, while the simulation step size for the electromagnetic transient side is relatively small, such as calculating once every 50μs, data interaction between the electromechanical transient side simulation and the electromagnetic transient side simulation needs to be performed at certain time intervals. The difference in time scale between the electromechanical transient side and the electromagnetic transient side simulation imposes requirements on the frequency and amount of data interaction. This invention designs as follows... Figure 4 The data interaction timing strategy shown is designed to meet the requirements of electromechanical-electromagnetic transient hybrid simulation processing. Figure 4 In the normal state, the electromechanical transient simulation tool (i.e., the electromechanical transient side) and the electromagnetic transient simulation tool (i.e., the electromagnetic transient side) exchange data at time intervals of dT, where dT is determined by the simulation step size of the electromechanical transient side. Steps (2) and (4) represent the data exchange between the electromechanical transient simulation tool and the electromagnetic transient simulation tool, while steps (3) and (5) represent the parallel simulation process. Therefore, at each t+ndT time, the electromagnetic transient simulation tool transmits the simulation processing data of the same time to the electromechanical transient simulation tool and waits for the electromechanical transient simulation to end; after the electromechanical transient simulation ends, it transmits the simulation results and other data with a 2dT delay to the electromagnetic transient simulation tool; the electromagnetic transient simulation tool continues to perform simulation calculations on the electromagnetic transient side using the simulation processing data obtained from the electromechanical transient simulation side.

[0073] When the electromagnetic transient network topology changes, such as during the occurrence or elimination of a fault (i.e., during the period of interference or fault events input into the power transmission and distribution network), in order to reflect the interference or fault events in the electromechanical transient simulation tool in a timely manner, so as to quickly discover the stability problems of the power transmission and distribution network and improve the accuracy of the stability analysis and processing of the power transmission and distribution network, the hybrid simulation is performed in serial computing, as shown in steps (6) to (17). At this time, the electromechanical transient side simulation processing and the electromagnetic transient side simulation processing are performed alternately. The electromechanical transient side is still based on the electromagnetic transient side simulation processing data at the same time, while the electromagnetic transient side will be based on the electromechanical transient side simulation processing data with only one dT delay, thereby improving the accuracy of the simulation analysis during the interference or fault event. After the interference or fault event is eliminated, the hybrid simulation will return to the parallel computing state to improve the simulation efficiency. The two simulation tools are arranged in parallel. Figure 4 The timing sequence is simulated and data is exchanged until the simulation ends.

[0074] This invention applies a frequency shift transformation method to the hybrid simulation of electromechanical and electromagnetic transients, completing the data form conversion between the fundamental phasor on the electromechanical transient side and the three-phase instantaneous values ​​on the electromagnetic transient side. The proposed frequency shift transformation method only processes the interactive signals, without requiring equivalent or simplified processing of the transient model, thus leveraging the respective model characteristics and advantages of both methods. While preserving key model characteristics, it achieves accurate and efficient hybrid simulation of electromechanical and electromagnetic transients. Simultaneously, the data timing interaction employs a combined parallel and serial strategy, enabling hybrid simulation of electromechanical and electromagnetic transients with different simulation step sizes. Furthermore, the combined parallel and serial computing strategy utilizes parallel computing to improve simulation speed during stable system operation, while switching to serial computing to improve simulation accuracy when interference or faults occur, causing changes in the network structure. This effectively reconciles the contradiction between speed and accuracy caused by the interface timing method, improving the accuracy and efficiency of hybrid electromechanical-electromagnetic transient simulation.

[0075] In summary, the electromechanical and electromagnetic transient hybrid simulation processing method provided by this invention obtains the three-phase AC current output from the electromagnetic transient side, converts the three-phase AC current into a single-phase positive-sequence current used for electromechanical transient side simulation using frequency shift transformation, and sends the single-phase positive-sequence current to the electromechanical transient side for simulation processing to obtain first simulation processing data; obtains the single-phase positive-sequence current output from the electromechanical transient side, converts the single-phase positive-sequence current into a three-phase AC current used for electromagnetic transient side simulation using inverse frequency shift transformation, and sends the three-phase AC current to the electromagnetic transient side for simulation processing to obtain second simulation processing data; and determines the stability analysis results of the power transmission and distribution system network based on the first and second simulation processing data. This method enables hybrid simulation between the electromechanical transient side and the electromagnetic transient side with different simulation step sizes, effectively improving the accuracy and efficiency of electromechanical and electromagnetic transient hybrid simulation, thereby enhancing the accuracy and efficiency of stability analysis of the power transmission and distribution system network.

[0076] The electromechanical and electromagnetic transient hybrid simulation processing device provided by the present invention is described below. The electromechanical and electromagnetic transient hybrid simulation processing device described below can be referred to in correspondence with the electromechanical and electromagnetic transient hybrid simulation processing method described above. References Figure 5 The diagram shown is a structural schematic of the electromechanical and electromagnetic transient hybrid simulation processing device provided by the present invention. The electromechanical and electromagnetic transient hybrid simulation processing device of the present invention specifically includes the following parts:

[0077] The frequency shift conversion processing unit 501 is used to acquire the three-phase AC current output from the electromagnetic transient side, convert the three-phase AC current into a single-phase positive-sequence current used for electromechanical transient side simulation using frequency shift conversion, and send the single-phase positive-sequence current to the electromechanical transient side for simulation processing to obtain the first simulation processing data; wherein, the electromagnetic transient side is an electromagnetic transient simulation module corresponding to the transmission system network in the power transmission and distribution system network, and the electromechanical transient side is an electromechanical transient simulation module corresponding to the distribution system network in the power transmission and distribution system network.

[0078] The frequency shift inverse transformation processing unit 502 is used to acquire the single-phase positive sequence current output from the electromechanical transient side, convert the single-phase positive sequence current into a three-phase AC current used for electromagnetic transient side simulation using the frequency shift inverse transformation method, and send the three-phase AC current to the electromagnetic transient side for simulation processing to obtain the second simulation processing data.

[0079] The simulation processing and analysis unit 503 is used to determine the stability analysis results of the power transmission and distribution system network based on the first simulation processing data and the second simulation processing data.

[0080] According to the electromechanical and electromagnetic transient hybrid simulation processing device provided by the present invention, the frequency shift transformation processing unit is specifically used for: determining the analytical signal corresponding to the three-phase AC current, performing frequency shift transformation processing on the spectrum of the analytical signal to obtain the complex envelope signal obtained after frequency shift transformation; and converting the complex envelope signal obtained after frequency shift transformation into a single-phase positive sequence signal.

[0081] According to the electromechanical and electromagnetic transient hybrid simulation processing device provided by the present invention, the frequency shift inverse transformation processing unit is specifically used to: convert the single-phase positive sequence current into an initial three-phase AC signal, perform frequency shift inverse transformation processing on the initial three-phase AC signal, and obtain a three-phase AC current used for electromagnetic transient side simulation processing.

[0082] According to the electromechanical and electromagnetic transient hybrid simulation processing device provided by the present invention, the simulation processing and analysis unit is specifically used for:

[0083] It is determined whether the curve data of various attributes in the first simulation processing data exceed the corresponding first threshold. If the curve data of various attributes in the first simulation processing data do not exceed the corresponding first threshold, the stability analysis result of the power transmission system network is determined to meet the target condition. The curve data of various attributes in the first simulation processing data includes the first voltage change curve data, the first current change curve data, and the first power change curve data.

[0084] It is determined whether the curve data of various attributes in the second simulation processing data exceed the corresponding second threshold. If the curve data of various attributes in the second simulation processing data do not exceed the corresponding second threshold, the stability analysis result of the power distribution system network is determined to meet the target condition. The curve data of various attributes in the second simulation processing data includes the second voltage change curve data, the second current change curve data, and the second power change curve data.

[0085] The first simulation processing data includes first voltage change curve data, first current change curve data, and first power change curve data corresponding to the transmission system network in the power transmission and distribution system network; the second simulation processing data includes second voltage change curve data, second current change curve data, and second power change curve data corresponding to the distribution system network in the power transmission and distribution system network.

[0086] The electromechanical and electromagnetic transient hybrid simulation processing device provided by the present invention further includes:

[0087] Data timing interaction control unit, used for:

[0088] Acquire interference or fault events input into the power transmission and distribution system network;

[0089] Based on a preset data timing interaction strategy, the data interaction during the hybrid simulation process of the electromechanical transient side and the electromagnetic transient side is processed to obtain hybrid simulation processing data. The data timing interaction strategy is a combination of parallel simulation processing and serial simulation processing. When the interference or fault event occurs, the electromechanical transient side and the electromagnetic transient side adopt serial simulation processing operation, and when the interference or fault event does not occur, the electromechanical transient side and the electromagnetic transient side adopt parallel simulation processing operation.

[0090] According to the electromechanical and electromagnetic transient hybrid simulation processing device provided by the present invention, the step of processing the data interaction during the hybrid simulation processing of the electromechanical transient side and the electromagnetic transient side to obtain hybrid simulation processing data includes: sending the single-phase positive sequence current to the electromechanical transient side for simulation processing to obtain first simulation processing data; and sending the three-phase alternating current to the electromagnetic transient side for simulation processing to obtain second simulation processing data.

[0091] The electromechanical and electromagnetic transient hybrid simulation processing device of the present invention is an interface device that connects the electromagnetic transient side and the electromechanical transient side and is used for data interaction processing between the electromagnetic transient side and the electromechanical transient side.

[0092] The electromechanical and electromagnetic transient hybrid simulation processing device provided by this invention acquires the three-phase AC current output from the electromagnetic transient side, converts the three-phase AC current into a single-phase positive-sequence current used for electromechanical transient side simulation using frequency shift transformation, and sends the single-phase positive-sequence current to the electromechanical transient side for simulation processing to obtain first simulation processing data; acquires the single-phase positive-sequence current output from the electromechanical transient side, converts the single-phase positive-sequence current into a three-phase AC current used for electromagnetic transient side simulation using inverse frequency shift transformation, and sends the three-phase AC current to the electromagnetic transient side for simulation processing to obtain second simulation processing data; based on the first and second simulation processing data, the stability analysis results of the power transmission and distribution system network are determined. It can realize hybrid simulation between the electromechanical transient side and the electromagnetic transient side with different simulation step sizes, effectively improving the accuracy and efficiency of electromechanical and electromagnetic transient hybrid simulation, thereby enhancing the accuracy and efficiency of stability analysis of the power transmission and distribution system network.

[0093] Figure 6 An example is a schematic diagram of the physical structure of an electronic device, such as... Figure 6 As shown, the electronic device (i.e., the interface device that connects the electromagnetic transient side and the electromechanical transient side and is used for data interaction processing between the electromagnetic transient side and the electromechanical transient side) may include: a processor 601, a communication interface 604, a memory 602 and a communication bus 603, wherein the processor 601, the communication interface 604 and the memory 602 communicate with each other through the communication bus 603. The processor 601 can call logic instructions in the memory 602 to execute a hybrid electromechanical and electromagnetic transient simulation processing method. This method includes: acquiring the three-phase AC current output from the electromagnetic transient side; converting the three-phase AC current into a single-phase positive-sequence current used for electromechanical transient side simulation using a frequency shift converter; and sending the single-phase positive-sequence current to the electromechanical transient side for simulation processing to obtain first simulation processing data; wherein the electromagnetic transient side is an electromagnetic transient simulation module corresponding to the transmission system network in the power transmission and distribution system network, and the electromechanical transient side is an electromechanical transient simulation module corresponding to the distribution system network in the power transmission and distribution system network; acquiring the single-phase positive-sequence current output from the electromechanical transient side; converting the single-phase positive-sequence current into a three-phase AC current used for electromagnetic transient side simulation using an inverse frequency shift converter; and sending the three-phase AC current to the electromagnetic transient side for simulation processing to obtain second simulation processing data; and determining the stability analysis result of the power transmission and distribution system network based on the first simulation processing data and the second simulation processing data.

[0094] Furthermore, the logical instructions in the aforementioned memory 602 can be implemented as software functional units and, when sold or used as independent products, can be stored in a computer-readable storage medium. Based on this understanding, the technical solution of this application, in essence, or the part that contributes to the prior art, or a part of the technical solution, can be embodied in the form of a software product. This computer software product is stored in a storage medium and includes several instructions to cause a computer device (which may be a personal computer, server, or network device, etc.) to execute all or part of the steps of the methods described in the various embodiments of this application. The aforementioned storage medium includes various media capable of storing program code, such as USB flash drives, portable hard drives, read-only memory (ROM), random access memory (RAM), magnetic disks, or optical disks.

[0095] On the other hand, this application also provides a computer program product, which includes a computer program that can be stored on a computer-readable storage medium. When the computer program is executed by a processor, the computer can execute the electromechanical and electromagnetic transient hybrid simulation processing method provided by the above methods. This method includes: acquiring the three-phase alternating current output from the electromagnetic transient side, converting the three-phase alternating current into a single-phase positive-sequence current used for electromechanical transient side simulation using a frequency shift converter, and sending the single-phase positive-sequence current to the electromechanical transient side for simulation processing to obtain first simulation processing data; wherein, the... The electromagnetic transient side is an electromagnetic transient simulation module corresponding to the transmission system network in the power transmission and distribution system network, and the electromechanical transient side is an electromechanical transient simulation module corresponding to the distribution system network in the power transmission and distribution system network. The single-phase positive-sequence current output from the electromechanical transient side is acquired, and the single-phase positive-sequence current is converted into a three-phase AC current used for electromagnetic transient side simulation using a frequency shift inverse transformation method. This three-phase AC current is then sent to the electromagnetic transient side for simulation processing to obtain second simulation processing data. Based on the first simulation processing data and the second simulation processing data, the stability analysis result of the power transmission and distribution system network is determined.

[0096] Furthermore, this application also provides a computer-readable storage medium, comprising a stored program, wherein the program, when executed, performs the electromechanical and electromagnetic transient hybrid simulation processing method provided by the methods described above. This method includes: acquiring the three-phase AC current output from the electromagnetic transient side; converting the three-phase AC current into a single-phase positive-sequence current used for electromechanical transient side simulation using a frequency shift converter; and sending the single-phase positive-sequence current to the electromechanical transient side for simulation processing to obtain first simulation processing data; wherein the electromagnetic transient side is connected to the power transmission and distribution system network. The electromagnetic transient simulation module corresponds to the power transmission system network in the network, and the electromechanical transient side corresponds to the electromechanical transient simulation module corresponding to the power distribution system network in the power transmission and distribution system network. The single-phase positive sequence current output from the electromechanical transient side is acquired, and the single-phase positive sequence current is converted into a three-phase AC current used for electromagnetic transient side simulation using a frequency shift inverse transformation method. The three-phase AC current is then sent to the electromagnetic transient side for simulation processing to obtain second simulation processing data. Based on the first simulation processing data and the second simulation processing data, the stability analysis result of the power transmission and distribution system network is determined.

[0097] The device embodiments described above are merely illustrative. The units described as separate components may or may not be physically separate. The components shown as units may or may not be physical units; that is, they may be located in one place or distributed across multiple network units. Some or all of the modules can be selected to achieve the purpose of this embodiment according to actual needs. Those skilled in the art can understand and implement this without any creative effort.

[0098] Through the above description of the embodiments, those skilled in the art can clearly understand that each embodiment can be implemented by means of software plus necessary general-purpose hardware platforms, and of course, it can also be implemented by hardware. Based on this understanding, the above technical solutions, in essence or the part that contributes to the prior art, can be embodied in the form of a software product. This computer software product can be stored in a computer-readable storage medium, such as ROM / RAM, magnetic disk, optical disk, etc., and includes several instructions to cause a computer device (which may be a personal computer, server, or network device, etc.) to execute the methods described in the various embodiments or some parts of the embodiments.

[0099] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this application, and are not intended to limit them. Although this application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of this application.

Claims

1. A hybrid simulation method for electromechanical and electromagnetic transients, characterized in that, include: The three-phase AC current output from the electromagnetic transient side is obtained, and the three-phase AC current is converted into a single-phase positive-sequence current used in the electromechanical transient side simulation using a frequency shift transform. Specifically, this includes: determining the analytical signal corresponding to the three-phase AC current; performing a frequency shift transform on the spectrum of the analytical signal to obtain a complex envelope signal after the frequency shift transform; and converting the complex envelope signal obtained after the frequency shift transform into a single-phase positive-sequence signal. The specific transformation process is as follows: ； in, , The vector deviation is 120 degrees, e is the natural exponent, and j is the imaginary unit. They are respectively from The single-phase positive-sequence, negative-sequence, and zero-sequence components obtained after matrix transformation; take Complex envelope signal can be obtained The single-phase positive sequence component, i.e., the component of the three-phase AC signal. After frequency shifting, the single-phase positive sequence signal is suitable for electromechanical transient simulation. ; The single-phase positive sequence current is then sent to the electromechanical transient side for simulation processing to obtain the first simulation processing data. The electromagnetic transient side is an electromagnetic transient simulation module corresponding to the power transmission system network in the power transmission and distribution system network, and the electromechanical transient side is an electromechanical transient simulation module corresponding to the power distribution system network in the power transmission and distribution system network. The single-phase positive sequence current output from the electromechanical transient side is obtained, and the single-phase positive sequence current is converted into a three-phase AC current used for electromagnetic transient side simulation by using frequency shift inverse transformation. Specifically, this includes: converting the single-phase positive sequence current into an initial three-phase AC signal, performing frequency shift inverse transformation on the initial three-phase AC signal, and obtaining a three-phase AC current used for electromagnetic transient side simulation. The three-phase alternating current is then sent to the electromagnetic transient side for simulation processing to obtain the second simulation processing data. Based on the first simulation processing data and the second simulation processing data, the stability analysis results of the power transmission and distribution system network are determined; It also includes: acquiring interference or fault events input into the power transmission and distribution system network; Based on a preset data timing interaction strategy, the data interaction during the hybrid simulation process of the electromechanical transient side and the electromagnetic transient side is processed to obtain hybrid simulation processing data, including: sending the single-phase positive sequence current to the electromechanical transient side for simulation processing to obtain first simulation processing data; and sending the three-phase AC current to the electromagnetic transient side for simulation processing to obtain second simulation processing data. The data timing interaction strategy is based on a combination of parallel simulation processing and serial simulation processing. When the interference or fault event occurs, the electromechanical transient side and the electromagnetic transient side adopt serial simulation processing operation, and when the interference or fault event does not occur, the electromechanical transient side and the electromagnetic transient side adopt parallel simulation processing operation.

2. The electromechanical and electromagnetic transient hybrid simulation processing method according to claim 1, characterized in that, The step of determining the stability analysis results of the power transmission and distribution system network based on the first simulation data and the second simulation data specifically includes: It is determined whether the curve data of various attributes in the first simulation processing data exceed the corresponding first threshold. If the curve data of various attributes in the first simulation processing data do not exceed the corresponding first threshold, the stability analysis result of the power transmission system network is determined to meet the target condition. The curve data of various attributes in the first simulation processing data includes the first voltage change curve data, the first current change curve data, and the first power change curve data. It is determined whether the curve data of various attributes in the second simulation processing data exceed the corresponding second threshold. If the curve data of various attributes in the second simulation processing data do not exceed the corresponding second threshold, the stability analysis result of the power distribution system network is determined to meet the target condition. The curve data of various attributes in the second simulation processing data includes the second voltage change curve data, the second current change curve data, and the second power change curve data. The first simulation processing data includes first voltage change curve data, first current change curve data, and first power change curve data corresponding to the transmission system network in the power transmission and distribution system network; the second simulation processing data includes second voltage change curve data, second current change curve data, and second power change curve data corresponding to the distribution system network in the power transmission and distribution system network.

3. A hybrid electromechanical and electromagnetic transient simulation processing device for implementing the hybrid electromechanical and electromagnetic transient simulation processing method according to any one of claims 1 to 2.

4. An electronic device, comprising a memory, a processor, and a computer program stored in the memory and executable on the processor, characterized in that, When the processor executes the program, it implements the electromechanical and electromagnetic transient hybrid simulation processing method as described in any one of claims 1 to 2.

5. A non-transitory computer-readable storage medium having a computer program stored thereon, characterized in that, When the computer program is executed by the processor, it implements the electromechanical and electromagnetic transient hybrid simulation processing method as described in any one of claims 1 to 2.

6. A computer program product, comprising a computer program, characterized in that, When the computer program is executed by the processor, it implements the electromechanical and electromagnetic transient hybrid simulation processing method as described in any one of claims 1 to 2.

Images