Co-simulation method of power system model based on synchronized phasor measurement device

Abstract

The present application discloses a method for co-simulating a power system model based on a synchronized phasor measurement device, wherein the method includes: splitting the power system simulation model into at least two sub-models according to the decoupling point of the AC transmission line, and deploying the sub-models in at least two simulators respectively; obtaining a global synchronized phasor based on a zero-crossing synchronized phase angle measurement algorithm, and obtaining an electric energy signal based on the global synchronized phasor; sending the electric energy signal to each sub-model, and performing a co-simulation of each sub-model based on the electric energy signal. The present application performs a co-simulation of each sub-model based on an electric energy signal including a global synchronized phasor, which can improve the reliability of the co-simulation results.

Description

Technical Field

[0001] The present application relates to the field of power grid simulation, and in particular to a method for joint simulation of power system models based on a synchronized phasor measurement device. Background Art

[0002] The voltage phasor is an important parameter of the power system and an important basis for implementing various control and grid-connected closing operations. With the development of communication technology, especially the emergence of the global positioning system, a unified clock standard has been provided for the power system, making the synchronous measurement of phasors possible. Synchronous phasor measurement technology and synchronized phasor measurement units (PMUs) have become the focus of industrial wide area monitoring, protection and control (WAMPAC) applications in power systems. By transmitting data distributed in various synchronized phasor measurement units to the server in real time for monitoring, analysis, timing and other purposes. The IEEE C37.118 protocol and IEC / IEEE 60255-118-1 standard developed by the IEEE Electronics Engineering Society Power Systems Committee unify the output format of phasor data and the communication protocol of the system, and standardize the main technical performance of synchronized phasor measurement devices.

[0003] In power flow calculations, the busbar voltage represents the state vector of the power system, and its phase angle is a crucial variable describing the system's operating state. Therefore, real-time measurement of busbar voltage phasors at each substation, particularly their phase angles, is crucial for both system stability assessment and real-time control. Real-time synchronous phase angle measurement using on-site measurement devices, after state estimation at the dispatching center, can be used for stability analysis, offering significant real-time performance and accuracy. More importantly, this real-time synchronous phase angle measurement method can be easily extended to generator power angle measurement. Real-time measurement of the generator power angle yields a power angle trend curve, providing a new criterion for system stability assessment and generator out-of-step prediction. Implementing real-time, remote, synchronous measurement of phasor parameters requires considering two synchronization issues: frequency synchronization, i.e., synchronizing the sampling frequency with the measured signal frequency, and time synchronization, i.e., synchronizing the sampling time of the remote measured signal.

[0004] In the related art, the phasor acquisition method is to first measure the voltage amplitude and active power of the PV node (system voltage regulation node) and the active power and reactive power of the PQ node (load node) through a field measurement device, and then send the measured values to the dispatching center through the field measurement device. After the dispatching center performs state estimation on these measured values, it uses the Newton-Raphson method or the Gauss-Seidel method in the power flow calculation to repeatedly iterate the calculation to obtain the phase angle of the node voltage phasor, thereby obtaining the node voltage phasor, and use the node voltage phasor at this moment as the initial value in the stability calculation, and further perform the stability calculation.

[0005] Wide-area real-time monitoring systems within power systems rely primarily on the high accuracy of GPS-synchronized clocks to provide precise phase angle measurements. GPS satellites "time-stamp" broadcast navigation messages, providing a synchronized atomic clock network for the global dissemination of precise time and frequency data—the GPS timing service. GPS-based time synchronization technology synchronizes GPS time with Coordinated Universal Time (UTC) to nanoseconds. GPS satellites transmit a synchronization signal to Earth every second, and GPS receivers provide a 1PPS pulse signal with a 1-second interval, with an accuracy of at least 1μs. Therefore, for a 50Hz power frequency, the phase error does not exceed 0.018, fully meeting the requirements for power angle measurement.

[0006] However, the related art has the following shortcomings:

[0007] 1. In existing application scenarios, synchronized phasor measurement devices are used for system timing between stations and power grids at the macro scale, for timing of control instructions between multi-level collaborative control systems, or for timing correction of machine clocks between multiple simulator devices. They are not used at the real-time simulation model level of power systems at the micro scale.

[0008] 2. Traditional offline power system simulations are performed on a single computer or simulator. With the advent of real-time simulators, simulation models are compiled, downloaded, and run in real time on a lower-level computer. As the scale of power grids continues to grow, the computing resources required for real-time simulators are increasing. Real-time simulators need to be interconnected to expand the number of CPU (Central Processing Unit) computing units to solve larger power system models. However, it is currently impossible to control the simultaneous start of multiple simulators. While each simulator can perform real-time simulation, the simulations begin at different times, resulting in timing disruptions when solving the same model.

[0009] 3. For two parts of a unified model running in two real-time simulators, if both models contain an AC power grid with synchronous generators or a new energy power station with virtual synchronous control or a grid-type new energy power generation, if optical fiber is directly used for interconnection and the decoupling point is selected as the AC transmission line, since the different parts of the model are in the simulators with different timing sequences, their voltage phases will be different, which may cause the system to oscillate or even decouple.

[0010] 4. For the power system simulation model, after the basic grid structure is built, it is necessary to first perform offline power flow calculations to determine the reference bus, the active and reactive output of each PQ node, the voltage amplitude and phase angle of the PV node, and the initial phase angle of each rotating element, so that the model can quickly reach stability when downloaded to the lower computer for real-time operation. However, if the scale of the real-time power system simulation model exceeds the simulation capacity of a single simulator, the model needs to be split into multiple simulators for joint simulation. Since the pre-processing of the power flow calculation model between the upper computers is an offline calculation with physical isolation between computers, the equilibrium state of the overall model cannot be assigned to the separated individual models for power flow pre-solution. As a result, when the models are downloaded to each simulator for joint simulation, multiple self-balancing interconnections will have serious problems such as power flow exceeding the limit, backflow, oscillation or circulation, which will cause the simulation results to not converge. Summary of the Invention

[0011] The present application aims to solve one of the technical problems in the related art at least to a certain extent.

[0012] To this end, the purpose of this application is to solve the problem of synchronous joint simulation of power system simulation models deployed on multiple simulators, and proposes a power system model joint simulation method based on a synchronous phasor measurement device.

[0013] Another object of the present application is to propose a power system model joint simulation system based on synchronized phasor measurement devices.

[0014] To achieve the above objectives, the present application proposes a method for co-simulating a power system model based on a synchronized phasor measurement device, comprising:

[0015] Splitting the power system simulation model into at least two sub-models according to the decoupling point of the AC transmission line, and deploying the sub-models in at least two simulators respectively;

[0016] Obtaining a global synchronized phasor based on a zero-crossing synchronized phase angle measurement algorithm, and obtaining an electric energy signal according to the global synchronized phasor;

[0017] The electric energy signal is sent to each of the sub-models, and a joint simulation of each of the sub-models is performed according to the electric energy signal.

[0018] In a possible implementation, the acquiring of the global synchronized phasor based on the zero-crossing synchronized phase angle measurement algorithm includes:

[0019] Acquiring the AC signal of the bus voltage at each sub-model interface after filtering;

[0020] Performing analog-to-digital conversion on the AC signal to obtain a digitized AC signal;

[0021] The global synchronized phasor is obtained according to the digitized AC signal based on the zero-crossing synchronized phase angle measurement algorithm.

[0022] In a possible implementation, obtaining the global synchronized phasor according to the digitized AC signal based on the zero-crossing synchronized phase angle measurement algorithm includes:

[0023] Compare the zero-crossing moment of the digitized AC signal with the second pulse of the GPS-OEM receiving module to obtain the positive-sequence voltage phase angle corresponding to the digitized AC signal;

[0024] Determining one of the positive-sequence voltage phase angles as a reference phase angle, and calculating phase angle differences between the remaining positive-sequence voltage phase angles and the reference phase angle;

[0025] The remaining positive-sequence voltage phase angles are synchronized according to the phase angle difference to obtain the global synchronized phasor.

[0026] In a possible implementation manner, sending the electric energy signal to each of the sub-models includes:

[0027] Assembling the electric energy signal into a message according to the IEEE C37.118 protocol;

[0028] The message is sent to each of the sub-models via the optical fiber Aurora protocol.

[0029] In a possible implementation manner, the types of the message include: data frame, configuration frame, header frame and command frame.

[0030] To achieve the above objectives, the present application proposes a power system model joint simulation system based on a synchronized phasor measurement device, comprising:

[0031] a decoupling module, configured to split the power system simulation model into at least two sub-models according to the decoupling points of the AC transmission lines, and deploy the sub-models in at least two simulators respectively;

[0032] An acquisition module, configured to acquire a global synchronized phasor based on a zero-crossing synchronized phase angle measurement algorithm, and acquire an electric energy signal according to the global synchronized phasor;

[0033] A sending module is used to send the electric energy signal to each of the sub-models and perform joint simulation of each of the sub-models according to the electric energy signal.

[0034] In a possible implementation, the acquisition module includes:

[0035] A first acquisition unit is used to acquire the AC signal of the bus voltage at each sub-model interface after filtering;

[0036] a conversion unit, configured to perform analog-to-digital conversion on the AC signal to obtain a digitized AC signal;

[0037] The second acquisition unit is configured to acquire the global synchronized phasor according to the digitized AC signal and based on the zero-crossing synchronized phase angle measurement algorithm.

[0038] In a possible implementation, the second acquiring unit includes:

[0039] An acquisition subunit, configured to compare the zero-crossing moment of the digitized AC signal with the second pulse of the GPS-OEM receiving module to obtain a positive-sequence voltage phase angle corresponding to the digitized AC signal;

[0040] a calculation subunit, configured to determine one of the positive-sequence voltage phase angles as a reference phase angle, and calculate a phase angle difference between the remaining positive-sequence voltage phase angles and the reference phase angle;

[0041] The synchronization subunit is used to synchronize the remaining positive sequence voltage phase angles according to the phase angle difference to obtain the global synchronized phasor.

[0042] In a possible implementation, the sending module includes:

[0043] an assembling unit, configured to assemble the electric energy signal into a message according to the IEEE C37.118 protocol;

[0044] The sending unit is used to send the message to each of the sub-models through the optical fiber Aurora protocol.

[0045] In a possible implementation manner, the types of the message include: data frame, configuration frame, header frame and command frame.

[0046] Beneficial effects of this application:

[0047] In an embodiment of the present application, a power system simulation model is split into at least two sub-models based on the decoupling points of the AC transmission lines, and the sub-models are deployed in at least two simulators. A global synchronized phasor is obtained based on a zero-crossing synchronized phase angle measurement algorithm, and an electric energy signal is obtained based on the global synchronized phasor. The electric energy signal is sent to each sub-model, and a joint simulation of each sub-model is performed based on the electric energy signal. The present application performs a joint simulation of each sub-model based on the electric energy signal including the global synchronized phasor, which can improve the reliability of the joint simulation results.

[0048] Additional aspects and advantages of the present application will be given in part in the description below, and in part will become apparent from the description below, or will be learned through practice of the present application. BRIEF DESCRIPTION OF THE DRAWINGS

[0049] The above and / or additional aspects and advantages of the present application will become apparent and easily understood from the following description of the embodiments in conjunction with the accompanying drawings, in which:

[0050] Figure 1 Flowchart of a method for joint simulation of a power system model based on a synchronized phasor measurement device according to an embodiment of the present application;

[0051] Figure 2 A schematic diagram of a process for obtaining a global synchronized phasor according to an embodiment of the present application;

[0052] Figure 3 Schematic diagram of comparison between reference station voltage and substation voltage according to an embodiment of the present application;

[0053] Figure 4 is the relative phase angle difference between the sub-models according to the embodiment of the present application;

[0054] Figure 5 Schematic diagram of message transmission order according to an embodiment of the present application;

[0055] Figure 6 Schematic diagram of the structure of a power system model joint simulation system based on a synchronized phasor measurement device according to an embodiment of the present application. DETAILED DESCRIPTION

[0056] It should be noted that, in the absence of conflict, the embodiments and features of the embodiments in this application can be combined with each other. The present application will be described in detail below with reference to the accompanying drawings and in combination with the embodiments.

[0057] In order to enable those skilled in the art to better understand the present invention, the following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments in the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts should fall within the scope of protection of this application.

[0058] Explanation of terms:

[0059] Synchronized Phasor Measurement Unit (PMU): A synchronized phasor measurement unit (PMU) uses the second-level pulses of the Global Positioning System (GPS) as a synchronous clock. It can be used in areas such as dynamic monitoring, system protection, and system analysis and prediction of power systems. It is an important device for ensuring the safe operation of power grids.

[0060] Model pre-processing technology: Pre-processing is the stage of creating an analysis model. It is also the process of discretizing the continuous solution domain into a combination of a group of units, and using the approximate function assumed in each unit to represent the unknown field function to be solved in the solution domain in a piecemeal manner. At the same time, the initial state of each component in the model is pre-assigned to achieve rapid equilibrium during operation.

[0061] Wide Area Measurement System (WAMS): A next-generation power grid dynamic monitoring and control system based on synchronized phasor technology. Featuring remote, high-precision synchronized phasor measurement, high-speed communication, and rapid response, the WAMS is ideal for real-time monitoring of dynamic processes in large-span power grids.

[0062] Three elements of grid connection: the voltage difference between the generator voltage and the system voltage is within the allowable range, the difference between the generator frequency and the system frequency is within the allowable range, and the phase angle difference between the generator voltage phase angle and the system voltage phase angle is within the allowable range.

[0063] The following describes the power system model joint simulation method and system based on the synchronized phasor measurement device proposed in accordance with the embodiments of the present application with reference to the accompanying drawings. First, the power system model joint simulation method based on the synchronized phasor measurement device proposed in accordance with the embodiments of the present application will be described with reference to the accompanying drawings.

[0064] Figure 1 Flowchart of a method for joint simulation of a power system model based on a synchronized phasor measurement device according to an embodiment of the present application.

[0065] like Figure 1 As shown, the power system model joint simulation method based on the synchronized phasor measurement device includes:

[0066] Step S110 : splitting the power system simulation model into at least two sub-models according to the decoupling point of the AC transmission line, and deploying the sub-models in at least two simulators respectively.

[0067] In an embodiment of the present application, a model decoupling point can be set on an AC transmission line. Based on the decoupling point of the AC transmission line, the power system simulation model can be split into at least two sub-models, and each sub-model can be deployed on at least two simulators. In other words, after the power system simulation model is split into at least two sub-models based on the decoupling point of the AC transmission line, a sub-model of the power system simulation model is deployed on each of the same number of simulators, corresponding to the number of sub-models.

[0068] It should be noted that the interface module can be used to split the power system simulation model into at least two sub-models according to the decoupling point of the AC transmission line. Each sub-model has equal impedance, and the overall model composed of the sub-models can be equivalent as a Norton equivalent or Thevenin equivalent two-port.

[0069] Step S120: obtaining a global synchronized phasor based on a zero-crossing synchronized phase angle measurement algorithm, and obtaining an electric energy signal according to the global synchronized phasor.

[0070] In an embodiment of the present application, a global synchronized phasor may be obtained based on a zero-crossing synchronized phase angle measurement algorithm. After the global synchronized phasor is obtained, an electric energy signal may be obtained according to the global synchronized phasor.

[0071] It's important to note that the zero-crossing synchronous phase angle measurement algorithm compares the zero-crossing instant of the measured power frequency signal with the GPS (Global Positioning System) standard time to determine the phase angle difference. Currently, the rising edge accuracy of the pulse-per-second (1 pps) pulse of the GPS-OEM (Original Equipment Manufacturer) receiver module is within ±1 microsecond. For a 50 Hz power frequency, the phase error is ±0.018°, which is within the allowable phase error range.

[0072] Step S130 , sending the power signal to each sub-model, and performing joint simulation of each sub-model according to the power signal.

[0073] In an embodiment of the present application, after obtaining the electric energy signal according to the global synchronized phasor, the electric energy signal can be sent to each sub-model. After each sub-model obtains the electric energy signal including the global synchronized phasor, the joint simulation of each sub-model can be performed according to the electric energy signal.

[0074] It can be understood that, since the electric energy signal includes the global synchronized phasor, each sub-model can perform the global synchronized joint simulation of the power system simulation model based on the global synchronized phasor.

[0075] In an embodiment of the present application, a power system simulation model is split into at least two sub-models based on the decoupling points of the AC transmission lines, and the sub-models are deployed in at least two simulators. A global synchronized phasor is obtained based on a zero-crossing synchronized phase angle measurement algorithm, and an electric energy signal is obtained based on the global synchronized phasor. The electric energy signal is sent to each sub-model, and a joint simulation of each sub-model is performed based on the electric energy signal. The present application performs a joint simulation of each sub-model based on the electric energy signal including the global synchronized phasor, which can improve the accuracy of the joint simulation results.

[0076] In one possible implementation, obtaining a global synchronized phasor based on a zero-crossing synchronized phase angle measurement algorithm includes:

[0077] Obtain the AC signal of the bus voltage at each sub-model interface after filtering;

[0078] Convert the AC signal into digital form to obtain a digital AC signal;

[0079] According to the digitized AC signal, the global synchronized phasor is obtained based on the zero-crossing synchronized phase angle measurement algorithm.

[0080] In an embodiment of the present application, after each sub-model of the power system simulation model is deployed on each simulator, the AC signal of the bus voltage at the interface of each sub-model can be obtained, and the AC signal can be filtered to obtain the AC signal of the bus voltage at the interface of each sub-model after filtering. After obtaining the AC signal of the bus voltage at the interface of each sub-model after filtering, the AC signal can be converted from analog to digital to obtain a digitized AC signal. For example, the AC signal can be quantized through an A / D (Analog to Digital) converter to obtain a digitized AC signal. After obtaining the digitized AC signal, the global synchronized phasor can be obtained based on the zero-crossing synchronized phase angle measurement algorithm according to the digitized AC signal. For example, Figure 2 FIG. 1 is a flow chart of obtaining a global synchronized phasor according to an embodiment of the present application. Figure 2As shown, after obtaining the filtered AC signal of the bus voltage at each sub-model interface, the AC signal can be input into an A / D converter to output a digitized AC signal. The digitized AC signal is then input into a PMU device connected to a GPS receiver to output an electric energy signal, wherein the electric energy signal includes a global synchronized phasor. Finally, the electric energy signal is input into an MCU (Microcontroller Unit) so that it can be sent to each sub-model. In this way, the PMU device can obtain a global synchronized phasor based on the digitized AC signal using a zero-crossing synchronized phase angle measurement algorithm. Based on the global synchronized phasor, the sub-models deployed on the simulator can be synchronized for simulation, thereby improving the reliability of the simulation results.

[0081] In one possible implementation, obtaining a global synchronized phasor based on a zero-crossing synchronized phase angle measurement algorithm according to a digitized AC signal includes:

[0082] Compare the zero-crossing moment of the digitized AC signal with the second pulse of the GPS-OEM receiving module to obtain the positive-sequence voltage phase angle corresponding to the digitized AC signal;

[0083] Determine one of the positive sequence voltage phase angles as the reference phase angle, and calculate the phase angle differences between the remaining positive sequence voltage phase angles and the reference phase angle;

[0084] The remaining positive sequence voltage phase angles are synchronized according to the phase angle difference to obtain the global synchronized phasor.

[0085] In an embodiment of the present application, the zero-crossing moment of the digitized AC signal can be compared with the second pulse of the GPS-OEM receiving module to obtain the positive-sequence voltage phase angle corresponding to the digitized AC signal. It should be noted that the positive-sequence voltage phase angle corresponding to the digitized AC signal can be the positive-sequence voltage phase angle relative to the absolute time of Coordinated Universal Time (UTC). Then, one of the positive-sequence voltage phase angles can be determined as a reference phase angle, and the phase angle difference between the remaining positive-sequence voltage phase angles and the reference phase angle can be calculated. Figure 3 FIG. 1 is a schematic diagram showing a comparison between a reference station voltage and a substation voltage according to an embodiment of the present application. Figure 3As shown, the phase angle difference between the reference station positive-sequence voltage phase angle and the substation positive-sequence voltage phase angle can be obtained. It should be noted that the phase angle difference between the remaining positive-sequence voltage phase angle and the reference phase angle is the per-unit phase angle difference. The per-unit phase angle difference can be used to determine the method and magnitude of the power flow between any two sub-models. After obtaining the phase angle difference between the remaining positive-sequence voltage phase angle and the reference phase angle, the remaining positive-sequence voltage phase angle can be synchronized according to the phase angle difference to obtain a global synchronized phasor. In this way, a global synchronized phasor can be obtained based on the digitized AC signal through the zero-crossing synchronized phase angle measurement algorithm, so that the synchronized simulation of each sub-model deployed on the simulator can be achieved based on the global synchronized phasor, thereby improving the reliability of the simulation results.

[0086] It should be noted that for a power system simulation model split into two submodels, the synchronized phasor measurement device can use the GPS signal of one submodel as the reference for the sampling process. The phasor calculated from the sampled data is called a relative synchronized phasor. For a power system simulation model split into multiple submodels, the phase angle difference between any two submodels refers to the phase angle difference of the bus positive sequence voltage phasor at the interface between the two submodels under the same GPS signal. This is one of the important state variables that characterize the submodel operation. Figure 4 is the phase angle difference between the sub-models according to the embodiment of the present application, such as Figure 4 As shown, the phase angle differences of the measured phase angles can be determined based on the phase angle differences between the measured phase angle 1, the measured phase angle 2, and the measured phase angle 3 and the reference phase angle.

[0087] In one possible implementation, sending the electric energy signal to each sub-model includes:

[0088] Assemble power signals into messages according to IEEE C37.118 protocol;

[0089] The message is sent to each sub-model via the fiber optic Aurora protocol.

[0090] In an embodiment of the present application, after obtaining the electric energy signal, the electric energy signal can be assembled into a message according to the IEEE C37.118 protocol, and then the message can be sent to each sub-model through the fiber optic Aurora protocol. For example, the electric energy signal can be assembled into a message by adding a time stamp according to the form specified by the IEEE C37.118 protocol, and then transmitted to the remote data concentrator PDC (Phasor Data Concentrator) through the fiber optic Aurora protocol on the FPGA (Field-Programmable Gate Array) board connected to the communication interface of each CPU with the PCIe (Peripheral Component Interconnect express, high-speed serial computer expansion bus standard) protocol, integrated in the MCU, and then distributed to each sub-model through the data concentrator. In this way, the electric energy signal can be sent to each sub-model through the IEEE C37.118 protocol and the fiber optic Aurora protocol to ensure the synchronous joint simulation of each sub-model.

[0091] It should be noted that the fiber-optic Aurora protocol is a high-speed communication protocol characterized by reliability and speed. Its speed is reflected in its low communication latency, ensuring that a single interaction with the co-simulation model occurs within a simulation step of 10 to 50 μs. Its accuracy is demonstrated by the model decoupling, which utilizes line parameters for equivalent decoupling. The decoupled interface module transmits voltage or current to the controlled source at the other end via the Aurora protocol, eliminating numerical errors.

[0092] It's important to note that the data concentrator collects information from each PMU and provides each submodel with a unified time series of AC positive-sequence phasors, including amplitude and phase angle. This is known as a global synchronized phasor. Amplitude can be expressed as AC voltage or current, while phase is referenced to the system's unified GPS time. The direction of power flow between any two submodels is determined by the phase angle difference. Each submodel's phase angle maintains a unique, consistent relationship with the reference phase angle, enabling comparison of signals from different locations using the same time coordinate.

[0093] In a possible implementation manner, the types of messages include: data frames, configuration frames, header frames, and command frames.

[0094] In the embodiment of the present application, the types of messages may include: data frames, configuration frames, header frames and command frames. It should be noted that data frames, configuration frames and header frames can be sent by the PMU, and command frames support two-way communication between the PMU and the emulator. Figure 5 A schematic diagram of the message transmission order according to an embodiment of the present application is shown in FIG. Figure 5As shown, data frames, configuration frames, header frames, and command frames all begin with a 2-byte SYNC field, followed by a 2-byte FRAMESIZE field and a 4-byte SOC timestamp. The FRACSEC field, DATA1 field, DATA2 field, ..., DATAn field, and finally the CHK field can then be transmitted. This order provides frame type identification and synchronization information. In this way, communication between the PMU and the simulator can be carried out using messages including data frames, configuration frames, header frames, and command frames, thereby sending power signals to each sub-model, ensuring the synchronization of the joint simulation of each sub-model.

[0095] In order to implement the above embodiment, Figure 6 As shown, this embodiment further provides a power system model joint simulation system 600 based on a synchronized phasor measurement device. The system 600 includes: a decoupling module 610 , an acquisition module 620 and a sending module 630 .

[0096] a decoupling module 610 for splitting the power system simulation model into at least two sub-models according to the decoupling points of the AC transmission lines, and deploying the sub-models in at least two simulators respectively;

[0097] An acquisition module 620 is configured to acquire a global synchronized phasor based on a zero-crossing synchronized phase angle measurement algorithm, and acquire an electric energy signal according to the global synchronized phasor;

[0098] The sending module 630 is used to send the power signal to each sub-model and perform joint simulation of each sub-model according to the power signal.

[0099] In a possible implementation, the acquisition module 620 includes:

[0100] A first acquisition unit is used to acquire the AC signal of the bus voltage at each sub-model interface after filtering;

[0101] A conversion unit, used to convert the AC signal into digital form to obtain a digitized AC signal;

[0102] The second acquisition unit is configured to acquire a global synchronized phasor according to the digitized AC signal and based on a zero-crossing synchronized phase angle measurement algorithm.

[0103] In a possible implementation, the second acquiring unit includes:

[0104] The acquisition subunit is used to compare the zero-crossing moment of the digitized AC signal with the second pulse of the GPS-OEM receiving module to obtain the positive sequence voltage phase angle corresponding to the digitized AC signal;

[0105] a calculation subunit, configured to determine one of the positive sequence voltage phase angles as a reference phase angle, and calculate the phase angle differences between the remaining positive sequence voltage phase angles and the reference phase angle;

[0106] The synchronization subunit is used to synchronize the remaining positive sequence voltage phase angles according to the phase angle difference to obtain the global synchronized phasor.

[0107] In a possible implementation, the sending module 630 includes:

[0108] An assembly unit, used for assembling the electric energy signal into a message according to the IEEE C37.118 protocol;

[0109] The sending unit is used to send the message to each sub-model through the optical fiber Aurora protocol.

[0110] In a possible implementation manner, the types of messages include: data frames, configuration frames, header frames, and command frames.

[0111] According to the power system model joint simulation system based on the synchronous phasor measurement device of the embodiment of the present application, the decoupling module is used to split the power system simulation model into at least two sub-models according to the decoupling point of the AC transmission line, and the sub-models are deployed in at least two simulators respectively; the acquisition module is used to obtain the global synchronous phasor based on the zero-crossing synchronous phase angle measurement algorithm, and obtain the electric energy signal according to the global synchronous phasor; the sending module is used to send the electric energy signal to each sub-model, and perform the joint simulation of each sub-model according to the electric energy signal. The present application performs the joint simulation of each sub-model based on the electric energy signal including the global synchronous phasor, which can improve the reliability of the joint simulation result.

[0112] It should be noted that the above explanation of the embodiment of the power system model joint simulation method based on the synchronized phasor measurement device is also applicable to the power system model joint simulation system based on the synchronized phasor measurement device of this embodiment, and will not be repeated here.

[0113] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of the technical features being referred to. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one of such features. Throughout the description of this application, "plurality" means at least two, for example, two, three, etc., unless otherwise specifically defined.

[0114] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "example", "specific example", or "some examples" means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present application. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any one or more embodiments or examples in a suitable manner. In addition, those skilled in the art can combine and combine different embodiments or examples described in this specification and features of different embodiments or examples without contradiction.

[0115] Although the embodiments of the present application have been shown and described above, it can be understood that the above embodiments are exemplary and cannot be understood as limitations on the present application. Ordinary technicians in this field can change, modify, replace and modify the above embodiments within the scope of the present application.

Claims

1. A method for joint simulation of power system models based on synchronized phasor measurement devices, characterized in that: include: Splitting the power system simulation model into at least two sub-models according to the decoupling point of the AC transmission line, and deploying the sub-models in at least two simulators respectively; Obtaining a global synchronized phasor based on a zero-crossing synchronized phase angle measurement algorithm, and obtaining an electric energy signal according to the global synchronized phasor; Sending the electric energy signal to each of the sub-models, and performing joint simulation of each of the sub-models according to the electric energy signal; The method of obtaining a global synchronized phasor based on a zero-crossing synchronized phase angle measurement algorithm includes: Acquiring the AC signal of the bus voltage at each sub-model interface after filtering; Performing analog-to-digital conversion on the AC signal to obtain a digitized AC signal; According to the digitized AC signal, obtaining the global synchronized phasor based on the zero-crossing synchronized phase angle measurement algorithm; The step of obtaining the global synchronized phasor according to the digitized AC signal and based on the zero-crossing synchronized phase angle measurement algorithm includes: Compare the zero-crossing moment of the digitized AC signal with the second pulse of the GPS-OEM receiving module to obtain the positive-sequence voltage phase angle corresponding to the digitized AC signal; Determining one of the positive-sequence voltage phase angles as a reference phase angle, and calculating phase angle differences between the remaining positive-sequence voltage phase angles and the reference phase angle; The remaining positive-sequence voltage phase angles are synchronized according to the phase angle difference to obtain the global synchronized phasor.

2. The method for co-simulating a power system model based on a synchronized phasor measurement device according to claim 1, characterized in that: The sending of the electric energy signal to each of the sub-models includes: Assembling the electric energy signal into a message according to the IEEE C37.118 protocol; The message is sent to each of the sub-models via the optical fiber Aurora protocol.

3. The power system model joint simulation method based on synchronized phasor measurement device according to claim 2 is characterized in that: The types of the message include: data frame, configuration frame, header frame and command frame.

4. A power system model joint simulation system based on synchronized phasor measurement device, characterized in that: include: a decoupling module, configured to split the power system simulation model into at least two sub-models according to the decoupling points of the AC transmission lines, and deploy the sub-models in at least two simulators respectively; An acquisition module is used to acquire a global synchronized phasor based on a zero-crossing synchronized phase angle measurement algorithm, and to acquire an electric energy signal according to the global synchronized phasor; a sending module, configured to send the electric energy signal to each of the sub-models, and perform a joint simulation of each of the sub-models according to the electric energy signal; The acquisition module includes: A first acquisition unit is used to acquire the AC signal of the bus voltage at each sub-model interface after filtering; a conversion unit, configured to perform analog-to-digital conversion on the AC signal to obtain a digitized AC signal; A second acquisition unit is configured to acquire the global synchronized phasor according to the digitized AC signal and based on the zero-crossing synchronized phase angle measurement algorithm; The second acquiring unit includes: An acquisition subunit, configured to compare the zero-crossing moment of the digitized AC signal with the second pulse of the GPS-OEM receiving module to obtain a positive-sequence voltage phase angle corresponding to the digitized AC signal; a calculation subunit, configured to determine one of the positive-sequence voltage phase angles as a reference phase angle, and calculate a phase angle difference between the remaining positive-sequence voltage phase angles and the reference phase angle; The synchronization subunit is used to synchronize the remaining positive sequence voltage phase angles according to the phase angle difference to obtain the global synchronized phasor.

5. The power system model joint simulation system based on synchronized phasor measurement device according to claim 4, characterized in that: The sending module includes: an assembling unit, configured to assemble the electric energy signal into a message according to the IEEE C37.118 protocol; The sending unit is used to send the message to each of the sub-models through the optical fiber Aurora protocol.

6. The power system model joint simulation system based on synchronized phasor measurement device according to claim 5, characterized in that: The types of the message include: data frame, configuration frame, header frame and command frame.

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