CN116244901A - Electric power system model joint simulation method based on synchronous phasor measurement device - Google Patents
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Abstract
The application discloses a power system model joint simulation method based on a synchronous phasor measurement device, wherein the method comprises the following steps: splitting a simulation model of the power system into at least two sub-models according to decoupling points of the alternating current transmission line, and respectively deploying the sub-models into at least two simulators; acquiring a global synchronous phasor based on a zero crossing point synchronous phase angle measurement algorithm, and acquiring an electric energy signal according to the global synchronous phasor; and sending the electric energy signal to each sub-model, and executing the joint simulation of each sub-model according to the electric energy signal. The method and the device perform joint simulation of each sub-model based on the electric energy signal comprising the global synchronous phasor, and can improve the reliability of the joint simulation result.
Description
Technical Field
The application relates to the field of power grid simulation, in particular to a power system model joint simulation method based on a synchronous phasor measurement device.
Background
The voltage phasors are an important parameter of the power system and are also important bases for implementing various control and grid-connected closing operations. With the development of communication technology, particularly the advent of global positioning systems, unified clock standards are provided for power systems, so that synchronous measurement of phasors is possible. Synchrophasor measurement techniques and synchrophasor measurement units (Phasor Measurement Unit, PMU) have become an important point for wide area monitoring, protection and control (Wide Area Monitoring, protection and Control, WAMPAC) applications in the power system industry. The data distributed in each synchrophasor measurement unit is transmitted to a server side in real time for monitoring, analysis, time synchronization and other purposes. The output format of phasor data and the communication protocol of the system are unified by the IEEE C37.118 protocol and IEC/IEEE 60255-118-1 standard which are set by the institute of Electrical and electronics Engineers power system Commission, and the main technical performance of the synchronous phasor measurement device is standardized.
In the power flow calculation, the voltage of the bus node is a state vector of the power system, and the phase angle is an important variable describing the running state of the system. Therefore, the real-time measurement of the bus voltage phasors of each transformer substation, particularly the phase angles of the bus voltage phasors, has very important significance for judging the stability of the system or controlling the system in real time. The on-site measuring device is utilized to synchronously measure the phase angle in real time, and the obtained phase angle measuring data can be used for stability analysis after being subjected to state estimation in the dispatching center, so that the real-time performance and the precision are obviously higher. More importantly, the real-time synchronous measuring method of the phase angle can be conveniently popularized and applied to power angle measurement of the generator, and a power angle trend curve graph of the generator can be obtained by measuring the power angle of the generator in real time, so that a new criterion can be provided for judging the stability of the system and predicting the out-of-step of the generator. The real-time remote synchronous measurement of phasor parameters is realized, and two synchronous problems need to be considered: frequency synchronization, namely the problem of frequency synchronization of sampling frequency and the frequency of a measured signal, and time synchronization, namely the problem of time synchronization sampling of a measured signal in different places.
In the related technology, the phasor acquisition method is to firstly measure the voltage amplitude and the active power of a PV node (system voltage regulation node) and the active power and the reactive power of a PQ node (load node) through a field measurement device, then send the measured values to a dispatching center through the field measurement device, and after the state estimation of the measured values by the dispatching center, repeatedly and iteratively calculate by adopting a Newton-Lafson method or a Gaussian-Sedel method in the power flow calculation to obtain the phase angle of the node voltage phasor, thereby obtaining the node voltage phasor, taking the node voltage phasor at the moment as an initial value in the stability calculation, and further carrying out the stability calculation.
In a wide area real-time monitoring system in a power system, high accuracy of a GPS synchronous clock is mainly relied on to provide accurate phase angle measurement for the wide area real-time monitoring system. The GPS satellite marks the broadcasted navigation message with a time mark, and provides a synchronous atomic clock network, namely GPS time service, for the propagation of precise time and frequency data worldwide. By means of a GPS-based time synchronization technique, GPS time and coordinated universal time UTC can be synchronized to nanosecond orders. The GPS geostationary satellite transmits 1 synchronization signal per second to the earth, and the GPS receiver may provide a pulse signal 1PPS at 1s intervals with an accuracy of not less than 1 μs. Therefore, for the power frequency quantity of 50Hz, the phase error is not more than 0.018, and the requirement of power angle measurement can be completely met.
However, the related art has the following disadvantages:
1. in the existing application scene, the synchronous phasor measurement device is used for system time synchronization between the station and the power grid under the macro scale, or time synchronization of control instructions between multi-level cooperative control systems, or time synchronization correction of machine clocks among a plurality of simulator devices, and is not applied to the real-time simulation model level of the power system under the micro scale.
2. In the traditional offline power system simulation, the offline simulation is performed in a single computer or simulator. After the real-time simulator appears, the simulation model is compiled and downloaded to run in the lower computer in real time. With the increasing size of the power grid, the requirement on the computing resources of the real-time simulator is continuously increased, and the real-time simulator needs to be interconnected to expand the number of CPU (Central Processing Unit ) computing units to solve a larger-scale power system model. However, at present, a plurality of simulators cannot be controlled to start at the same time, namely, each simulator can perform real-time simulation, but the simulation starts from different moments, so that the system has timing disorder when the same model is solved.
3. For two parts of a unified model running in two real-time simulators, an alternating current power grid with synchronous generators or a new energy power station with virtual synchronous control or a network-structured new energy power generation is arranged in the models on two sides, if the two parts are directly connected with each other by using optical fibers under the asynchronous simulation condition, and decoupling points are selected as alternating current transmission lines, as the voltage phases of the two parts of the model are different in the simulators under different time sequences, the system can oscillate or even be disconnected.
4. For the simulation model of the power system, offline power flow calculation is needed to be performed firstly after the basic grid structure is built, so that the reference bus, the active and reactive power output of each PQ node, the voltage amplitude and phase angle of the PV node and the initial phase angle of each rotating element are determined, and the model is quickly stabilized when being downloaded to a lower computer for real-time operation. However, if the real-time power system simulation model size exceeds the simulation capability of a single simulator, the model needs to be split into a plurality of simulators for joint simulation. Because the preprocessing of the power flow calculation models among the upper computers is off-line calculation of physical isolation among the computers, the balance state of the whole model cannot be distributed to the split independent models to carry out power flow pre-calculation, and thus when each model is downloaded to each simulator to carry out joint simulation, various self-balancing interconnection has serious problems of power flow overrun, backflow, oscillation or circulation and the like, so that simulation results are not converged.
Disclosure of Invention
The present application aims to solve, at least to some extent, one of the technical problems in the related art.
Therefore, the purpose of the application is to solve the synchronous joint simulation problem of the power system simulation models deployed in a plurality of simulators, and provide a power system model joint simulation method based on a synchronous phasor measurement device.
Another object of the present application is to propose a power system model joint simulation system based on a synchrophasor measurement device.
In order to achieve the above object, in one aspect, the present application provides a power system model joint simulation method based on a synchrophasor measurement device, including:
splitting a simulation model of the power system into at least two sub-models according to decoupling points of the alternating current transmission line, and respectively deploying the sub-models in at least two simulators;
acquiring a global synchronous phasor based on a zero crossing point synchronous phase angle measurement algorithm, and acquiring an electric energy signal according to the global synchronous phasor;
and sending the electric energy signal to each sub-model, and executing joint simulation of each sub-model according to the electric energy signal.
In one possible implementation manner, the acquiring the global synchrophasor based on the zero-crossing synchronization phase angle measurement algorithm includes:
acquiring alternating current signals of bus voltage at each sub-model interface after filtering treatment;
performing analog-to-digital conversion on the alternating current signal to obtain a digital alternating current signal;
and acquiring the global synchronous phasor based on the zero crossing point synchronous phase angle measurement algorithm according to the digital alternating current signal.
In a possible implementation manner, the obtaining the global synchrophasor based on the zero-crossing synchronization phase angle measurement algorithm according to the digitized ac signal includes:
comparing the zero crossing point moment of the digital alternating current signal with the second pulse of the GPS-OEM receiving module to obtain a positive sequence voltage phase angle corresponding to the digital alternating current signal;
determining one positive-sequence voltage phase angle as a reference phase angle, and calculating phase angle differences between the rest of the positive-sequence voltage phase angles and the reference phase angle;
and synchronizing the phase angles of the rest positive sequence voltages according to the phase angle difference to obtain the global synchronous phasors.
In one possible embodiment, the sending the power signal to each of the submodels includes:
assembling the power signal into a message according to an IEEE C37.118 protocol;
and sending the message to each submodel through an optical fiber Aurora protocol.
In one possible implementation manner, the type of the message includes: data frames, configuration frames, header frames, and command frames.
In order to achieve the above objective, another aspect of the present application provides a power system model joint simulation system based on a synchrophasor measurement device, including:
the decoupling module is used for splitting the simulation model of the power system into at least two sub-models according to the decoupling points of the alternating current transmission line, and respectively deploying the sub-models in at least two simulators;
the acquisition module is used for acquiring a global synchronous phasor based on a zero crossing point synchronous phase angle measurement algorithm and acquiring an electric energy signal according to the global synchronous phasor;
and the transmitting module is used for transmitting the electric energy signal to each sub-model and executing joint simulation of each sub-model according to the electric energy signal.
In one possible embodiment, the acquiring module includes:
the first acquisition unit is used for acquiring alternating current signals of bus voltage at each sub-model interface after filtering;
the conversion unit is used for carrying out analog-to-digital conversion on the alternating current signal to obtain a digital alternating current signal;
and the second acquisition unit is used for acquiring the global synchronous phasor based on the zero crossing point synchronous phase angle measurement algorithm according to the digitized alternating current signal.
In one possible embodiment, the second obtaining unit includes:
the acquisition subunit is used for comparing the zero crossing point moment of the digital alternating current signal with the second pulse of the GPS-OEM receiving module to acquire a positive sequence voltage phase angle corresponding to the digital alternating current signal;
a calculating subunit, configured to determine one of the positive-sequence voltage phase angles as a reference phase angle, and calculate phase angle differences between the remaining positive-sequence voltage phase angles and the reference phase angle;
and the synchronization subunit is used for synchronizing the rest positive sequence voltage phase angles according to the phase angle difference to acquire the global synchronous phasors.
In one possible implementation manner, the sending module includes:
the assembly unit is used for assembling the electric energy signals into messages according to an IEEE C37.118 protocol;
and the sending unit is used for sending the message to each submodel through an optical fiber Aurora protocol.
In one possible implementation manner, the type of the message includes: data frames, configuration frames, header frames, and command frames.
The beneficial effects of this application:
in the embodiment of the application, the simulation model of the electric power system is split into at least two sub-models according to the decoupling points of the alternating current transmission line, and the sub-models are respectively deployed in at least two simulators; acquiring a global synchronous phasor based on a zero crossing point synchronous phase angle measurement algorithm, and acquiring an electric energy signal according to the global synchronous phasor; and sending the electric energy signal to each sub-model, and executing the joint simulation of each sub-model according to the electric energy signal. The method and the device perform joint simulation of each sub-model based on the electric energy signal comprising the global synchronous phasor, and can improve the reliability of the joint simulation result.
Additional aspects and advantages of the application will be set forth in part in the description which follows and, in part, will be obvious from the description, or may be learned by practice of the application.
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The foregoing and/or additional aspects and advantages of the present application will become apparent and readily appreciated from the following description of the embodiments, taken in conjunction with the accompanying drawings, in which:
FIG. 1 is a flow chart of a method for joint simulation of a power system model based on a synchrophasor measurement device according to an embodiment of the present application;
fig. 2 is a schematic flow chart of acquiring a global synchrophasor according to an embodiment of the present application;
FIG. 3 is a schematic diagram of a comparison of reference station voltages and substation voltages according to an embodiment of the present application;
FIG. 4 is a graph of relative phase angle differences between sub-models according to an embodiment of the present application;
fig. 5 is a schematic diagram of a message transmission sequence according to an embodiment of the present application;
fig. 6 is a schematic structural diagram of a power system model joint simulation system based on a synchrophasor measurement device according to an embodiment of the present application.
Detailed Description
It should be noted that, in the case of no conflict, the embodiments and features in the embodiments may be combined with each other. The present application will be described in detail below with reference to the accompanying drawings in conjunction with embodiments.
In order to make the present application solution better understood by those skilled in the art, the following description will be made in detail and with reference to the accompanying drawings in the embodiments of the present application, it is apparent that the described embodiments are only some embodiments of the present application, not all embodiments. All other embodiments, which can be made by one of ordinary skill in the art based on the embodiments herein without making any inventive effort, shall fall within the scope of the present application.
Term interpretation:
synchrophasor measurement unit (PMU): the synchronous phasor measurement device is a phasor measurement unit formed by using the second-level pulse of the global positioning system as a synchronous clock, and can be used in the fields of dynamic monitoring, system protection, system analysis, prediction and the like of a power system.
Model preprocessing technology: the preprocessing is a stage of creating an analysis model, namely, a continuous solving domain is discretized into a combination of a group of units, the process of solving unknown field functions to be solved on the domain is represented in a fragmented way by using an approximate function assumed in each unit, and meanwhile, the initial states of all elements in the model are pre-assigned to realize quick equilibrium in operation.
Wide area measurement system (Wide Area Measurement System, WAMS): a new generation power grid dynamic monitoring and control system based on synchronous phasor technology. The wide-area measurement system has the technical characteristics of off-site high-precision synchronous phasor measurement, high-speed communication, quick response and the like, and is very suitable for the real-time monitoring of the dynamic process of a large-span power grid.
Grid connection three elements: the voltage difference between the generator voltage and the system voltage is within an allowable range, the generator frequency and the system frequency are within an allowable range, and the phase angle difference between the generator voltage phase angle and the system voltage phase angle is within an allowable range.
The following describes a power system model joint simulation method and system based on a synchrophasor measurement device according to an embodiment of the present application with reference to the accompanying drawings, and first describes a power system model joint simulation method based on a synchrophasor measurement device according to an embodiment of the present application with reference to the accompanying drawings.
Fig. 1 is a flowchart of a method for power system model joint simulation based on a synchrophasor measurement device according to an embodiment of the present application.
As shown in fig. 1, the electric power system model joint simulation method based on the synchrophasor measurement device includes:
step S110, splitting the simulation model of the power system into at least two sub-models according to decoupling points of the alternating current transmission line, and respectively deploying the sub-models in at least two simulators.
In the embodiment of the application, the model decoupling point can be arranged on the alternating current transmission line, the simulation model of the power system can be split into at least two sub-models according to the decoupling point of the alternating current transmission line, and the sub-models are respectively deployed on the at least two simulators. That is, after the simulation model of the electric power system is split into at least two sub-models according to the decoupling point of the ac transmission line, one sub-model of the simulation model of the electric power system is deployed on the same number of simulators corresponding to the number of sub-models.
It should be noted that, the interface module may be utilized to split the simulation model of the electric power system into at least two sub-models according to the decoupling point of the ac transmission line, where each sub-model is of equal impedance, and the overall model combined by each sub-model may be used as a two-port equivalent of a noon equivalent or a davin equivalent.
Step S120, acquiring a global synchronous phasor based on a zero crossing point synchronous phase angle measurement algorithm, and acquiring an electric energy signal according to the global synchronous phasor.
In the embodiment of the application, the global synchronous phasors can be obtained based on the zero crossing point synchronous phase angle measurement algorithm, and after the global synchronous phasors are obtained, the electric energy signals can be obtained according to the global synchronous phasors.
It should be noted that, the zero crossing point synchronization phase angle measurement algorithm may compare the zero crossing point time of the measured power frequency signal with the GPS (Global Positioning System ) standard time, so as to obtain the phase angle difference. The precision error of the rising edge of the second pulse (1 pps) of the current GPS-OEM (Original Equipment Manufacturer ) receiving module is within +/-1 microsecond, and the phase error of the current GPS-OEM receiving module is within +/-0.018 DEG for the power frequency of 50Hz, and the current GPS-OEM receiving module belongs to the allowable phase error range.
Step S130, the electric energy signal is sent to each sub-model, and the joint simulation of each sub-model is executed according to the electric energy signal.
In the embodiment of the application, after the electric energy signal is obtained according to the global synchrophasor, the electric energy signal may be sent to each sub-model, and after the electric energy signal including the global synchrophasor is obtained by each sub-model, joint simulation of each sub-model may be performed according to the electric energy signal.
It will be appreciated that, since the power signal includes a globally synchronized phasor, each sub-model may perform globally synchronized joint simulation of the power system simulation model based on the globally synchronized phasor.
In the embodiment of the application, the simulation model of the electric power system is split into at least two sub-models according to the decoupling points of the alternating current transmission line, and the sub-models are respectively deployed in at least two simulators; acquiring a global synchronous phasor based on a zero crossing point synchronous phase angle measurement algorithm, and acquiring an electric energy signal according to the global synchronous phasor; and sending the electric energy signal to each sub-model, and executing the joint simulation of each sub-model according to the electric energy signal. According to the method and the device, the joint simulation of each sub-model is carried out based on the electric energy signals comprising the global synchronous phasors, and the accuracy of the joint simulation result can be improved.
In one possible implementation, obtaining the global synchrophasor based on the zero-crossing synchrophase angle measurement algorithm includes:
acquiring an alternating current signal of bus voltage at each sub-model interface after filtering treatment;
analog-to-digital conversion is carried out on the alternating current signal, and a digital alternating current signal is obtained;
and acquiring the global synchronous phasors based on a zero crossing synchronous phase angle measurement algorithm according to the digital alternating current signals.
In the embodiment of the application, after each sub-model of the power system simulation model is respectively deployed on each simulator, an alternating current signal of the bus voltage at the interface of each sub-model can be obtained, and the alternating current signal is subjected to filtering processing, so that the alternating current signal of the bus voltage at the interface of each sub-model after the filtering processing is obtained. After the alternating current signals of the bus voltage at the interfaces of all the sub-models after the filtering processing are obtained, the alternating current signals can be subjected to analog-to-digital conversion to obtain digital alternating current signals. For example, the ac signal may be quantized by an a/D (Analog to Digital) converter to obtain a digitized ac signal. After the digitized ac signal is obtained, a global synchrophasor may be obtained based on a zero crossing synchronization phase angle measurement algorithm from the digitized ac signal. Fig. 2 is a schematic flow chart of acquiring global synchrophasors according to an embodiment of the present application, and as shown in fig. 2, after acquiring an ac signal of a bus voltage at each sub-model interface after filtering processing, the ac signal may be input to an a/D converter, and a digitized ac signal may be output. The digitized ac signal is then input to a PMU device coupled to the GPS receiver and a power signal is output, wherein the power signal includes a global synchrophasor. Finally, the power signal is input to the MCU (Microcontroller Unit, micro control unit) so that it can be sent to each sub-model. Therefore, the PMU device can acquire the global synchronous phasors based on the zero crossing synchronous phase angle measurement algorithm according to the digital alternating current signals, and the synchronous simulation of each sub-model deployed on the simulator can be realized based on the global synchronous phasors, so that the reliability of the simulation result is improved.
In one possible implementation, obtaining a global synchrophasor based on a zero-crossing synchrophasor measurement algorithm from a digitized ac signal includes:
comparing the zero crossing point moment of the digitized alternating current signal with the second pulse of the GPS-OEM receiving module to obtain a positive sequence voltage phase angle corresponding to the digitized alternating current signal;
determining one positive sequence voltage phase angle as a reference phase angle, and calculating phase angle differences between the rest positive sequence voltage phase angles and the reference phase angle;
and synchronizing the phase angles of the rest positive sequence voltages according to the phase angle difference to obtain a global synchronous phasor.
In the embodiment of the application, the zero crossing point moment of the digitized alternating current signal can be compared with the second pulse of the GPS-OEM receiving module, and the positive sequence voltage phase angle corresponding to the digitized alternating current signal is obtained. The positive-sequence voltage phase angle corresponding to the digitized ac signal may be a positive-sequence voltage phase angle with respect to the absolute time of the coordinated universal time UTC (Universal Time Coordinated). And then determining one positive-sequence voltage phase angle as a reference phase angle, and calculating phase angle differences between the rest positive-sequence voltage phase angles and the reference phase angle. Fig. 3 is a schematic diagram comparing reference station voltages and sub-station voltages according to an embodiment of the present application, and as shown in fig. 3, a phase angle difference between a reference station positive sequence voltage phase angle and a sub-station positive sequence voltage phase angle can be obtained. It should be noted that the phase angle difference between the rest positive sequence voltage phase angle and the reference phase angle is a per unit phase angle difference, and the method and the magnitude of the power flow between any two sub-models can be obtained through the per unit phase angle difference. After the phase angle difference between the rest of the positive sequence voltage phase angles and the reference phase angles is obtained, the rest of the positive sequence voltage phase angles can be synchronized according to the phase angle difference, so that the global synchronous phasor is obtained. Therefore, the global synchronous phasors can be obtained according to the digital alternating current signals through the zero crossing synchronous phase angle measurement algorithm, so that synchronous simulation of each sub-model deployed on the simulator can be realized based on the global synchronous phasors, and the reliability of simulation results is improved.
It should be noted that, for the power system simulation model split into two sub-models, the synchrophasor measurement device may use the GPS signal of one of the sub-models as a reference in the sampling process, and the phasor obtained by calculating the sampled data is referred to as a relative synchrophasor. For the power system simulation model split into a plurality of sub-models, the phase angle difference between any two sub-models refers to the phase angle difference of the bus positive sequence voltage phasors at the interfaces of the two sub-models under the same GPS signal, and is one of important state variables for representing the operation of the sub-models. FIG. 4 is a graph showing the phase angle difference between sub-models according to an embodiment of the present application, and as shown in FIG. 4, the phase angle difference seen by each measured phase angle can be determined according to 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.
In one possible embodiment, sending the power signal to each submodel includes:
assembling the power signal into a message according to an IEEE C37.118 protocol;
and sending the message to each submodel through an optical fiber Aurora protocol.
In the embodiment of the application, after the electric energy signal is acquired, the electric energy signal can be assembled into a message according to an IEEE C37.118 protocol, and then the message is sent to each sub-model through an optical fiber Aurora protocol. For example, the power signal may be assembled into a message by adding a time stamp according to a format specified by IEEE C37.118 protocol, and then transmitted to a remote data concentrator PDC (Phasor Data Concentrator) through an optical fiber Aurora protocol on a FPGA (Field-Programmable Gate Array, field programmable gate array) board card connected to each CPU communication interface in PCIe (Peripheral Component Interconnect express, high speed serial computer expansion bus standard) protocol, integrated in the MCU, and then distributed to each submodel through the data concentrator. Therefore, the electrical energy signal can be sent to each sub-model through the IEEE C37.118 protocol and the optical fiber Aurora protocol, and synchronous performance of joint simulation of each sub-model is ensured.
It should be noted that the optical fiber Aurora protocol is a high-speed communication protocol, and has the characteristics of reliability and rapidness. The rapidity is reflected in low communication delay, and the time of one-time interaction with the combined simulation model can be ensured to be within the simulation step length of 10 to 50 mu s. The accuracy is represented in that the model decoupling utilizes the parameters of the line to perform equivalent decoupling, and the decoupled interface module transmits voltage or current to a controlled source of an opposite end through an Aurora protocol, so that numerical errors cannot occur.
It should be noted that the data concentrator may collect information from each PMU and provide positive-sequence phasors, i.e., global synchrophasors, of ac quantities containing magnitude and phase angle in a uniform time sequence for each sub-model. The amplitude can be represented by alternating voltage and current, and the phase is based on the unified GPS time of the system. The flow direction of the power flow between every two sub-models is determined by the phase angle difference. There is a unique, deterministic, unified phase relationship between the phase angles of the various sub-models and the reference phase angle, so that the off-site signals can be compared at the same time coordinates.
In one possible implementation, the type of the message includes: data frames, configuration frames, header frames, and command frames.
In the embodiment of the present application, the types of the message may include: data frames, configuration frames, header frames, and command frames. It should be noted that, the data frame, the configuration frame, and the header frame may be sent by the PMU, and the command frame supports bi-directional communication between the PMU and the emulator. Fig. 5 is a schematic diagram of a message transmission sequence according to an embodiment of the present application, as shown in fig. 5, a DATA frame, a configuration frame, a header frame, and a command frame may all start with a SYNC field of 2 bytes, followed by a frameskip field of 2 bytes and an SOC time stamp of 4 bytes, after which a FRACSEC field, a DATA1 field, a DATA2 field, …, a DATAn field, and finally a CHK field may be transmitted, which may provide identification and synchronization information of a frame type. In this way, communication between the PMU and the simulator can be performed through messages comprising a data frame, a configuration frame, a header frame and a command frame, so that electric energy signals can be sent to each sub-model, and synchronous performance of joint simulation of each sub-model is ensured.
In order to implement the above embodiment, as shown in fig. 6, there is further provided a power system model joint simulation system 600 based on a synchrophasor measurement device, where the system 600 includes: a decoupling module 610, an acquisition module 620 and a sending module 630.
The decoupling module 610 is configured to split the power system simulation model into at least two sub-models according to decoupling points of the ac transmission line, and deploy the sub-models into at least two simulators respectively;
the acquiring module 620 is configured to acquire a global synchronous phasor based on a zero crossing point synchronous phase angle measurement algorithm, and acquire an electrical energy signal according to the global synchronous phasor;
the transmitting module 630 is configured to transmit the power signal to each sub-model, and perform joint simulation of each sub-model according to the power signal.
In one possible implementation, the obtaining module 620 includes:
the first acquisition unit is used for acquiring alternating current signals of bus voltage at the interfaces of all the sub-models after filtering;
the conversion unit is used for carrying out analog-to-digital conversion on the alternating current signal to obtain a digital alternating current signal;
the second acquisition unit is used for acquiring the global synchronous phasor based on a zero crossing synchronous phase angle measurement algorithm according to the digitized alternating current signal.
In one possible embodiment, the second acquisition unit includes:
the acquisition subunit is used for comparing the zero crossing point moment of the digital alternating current signal with the second pulse of the GPS-OEM receiving module to acquire a positive sequence voltage phase angle corresponding to the digital alternating current signal;
a calculating subunit, configured to determine one of the positive-sequence voltage phase angles as a reference phase angle, and calculate phase angle differences between the remaining positive-sequence voltage phase angles and the reference phase angle;
and the synchronization subunit is used for synchronizing the phase angles of the rest positive sequence voltages according to the phase angle difference to obtain a global synchronous phasor.
In one possible implementation, the sending module 630 includes:
the assembly unit is used for assembling the electric energy signals into messages according to the IEEE C37.118 protocol;
and the sending unit is used for sending the message to each submodel through the optical fiber Aurora protocol.
In one possible implementation, the type of the message includes: data frames, configuration frames, header frames, and command frames.
According to the electric power system model joint simulation system based on the synchronous phasor measurement device, the decoupling module is used for splitting an electric power system simulation model into at least two sub-models according to decoupling points of the alternating current transmission line, and the sub-models are respectively deployed in at least two simulators; the acquisition module is used for acquiring a global synchronous phasor based on a zero crossing point synchronous phase angle measurement algorithm and acquiring an electric energy signal according to the global synchronous phasor; and the sending module is used for sending the electric energy signal to each sub-model and executing the joint simulation of each sub-model according to the electric energy signal. The method and the device perform joint simulation of each sub-model based on the electric energy signal comprising the global synchronous phasor, and can improve the reliability of the joint simulation result.
It should be noted that the foregoing explanation of the embodiment of the electric power system model joint simulation method based on the synchrophasor measurement device is also applicable to the electric power system model joint simulation system based on the synchrophasor measurement device of this embodiment, and will not be repeated here.
Furthermore, the terms "first," "second," and the like, are used for descriptive purposes only and are not to be construed as indicating or implying a relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defining "a first" or "a second" may explicitly or implicitly include at least one such feature. In the description of the present application, the meaning of "plurality" is at least two, such as two, three, etc., unless explicitly defined otherwise.
In the description of the present specification, a description referring to terms "one embodiment," "some embodiments," "examples," "specific examples," or "some examples," etc., means that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the present application. In this specification, schematic representations of the above terms are not necessarily directed to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples. Furthermore, the different embodiments or examples described in this specification and the features of the different embodiments or examples may be combined and combined by those skilled in the art without contradiction.
Although embodiments of the present application have been shown and described above, it will be understood that the above embodiments are illustrative and not to be construed as limiting the application, and that variations, modifications, alternatives, and variations may be made to the above embodiments by one of ordinary skill in the art within the scope of the application.
Claims (10)
1. The utility model provides a power system model joint simulation method based on synchronous phasor measurement device, which is characterized by comprising the following steps:
splitting a simulation model of the power system into at least two sub-models according to decoupling points of the alternating current transmission line, and respectively deploying the sub-models in at least two simulators;
acquiring a global synchronous phasor based on a zero crossing point synchronous phase angle measurement algorithm, and acquiring an electric energy signal according to the global synchronous phasor;
and sending the electric energy signal to each sub-model, and executing joint simulation of each sub-model according to the electric energy signal.
2. The method for joint simulation of a power system model based on a synchrophasor measurement device according to claim 1, wherein the obtaining the global synchrophasor based on the zero-crossing synchronization phase angle measurement algorithm comprises:
acquiring alternating current signals of bus voltage at each sub-model interface after filtering treatment;
performing analog-to-digital conversion on the alternating current signal to obtain a digital alternating current signal;
and acquiring the global synchronous phasor based on the zero crossing point synchronous phase angle measurement algorithm according to the digital alternating current signal.
3. The method for joint simulation of a power system model based on a synchrophasor measurement device according to claim 2, wherein the obtaining the global synchrophasor based on the zero-crossing synchrophasor measurement algorithm according to the digitized ac signal comprises:
comparing the zero crossing point moment of the digital alternating current signal with the second pulse of the GPS-OEM receiving module to obtain a positive sequence voltage phase angle corresponding to the digital alternating current signal;
determining one positive-sequence voltage phase angle as a reference phase angle, and calculating phase angle differences between the rest of the positive-sequence voltage phase angles and the reference phase angle;
and synchronizing the phase angles of the rest positive sequence voltages according to the phase angle difference to obtain the global synchronous phasors.
4. The method for joint simulation of power system models based on synchrophasor measurement apparatus as set forth in claim 1, wherein the transmitting the power signal to each of the sub-models includes:
assembling the power signal into a message according to an IEEE C37.118 protocol;
and sending the message to each submodel through an optical fiber Aurora protocol.
5. The method for joint simulation of power system models based on synchrophasor measurement devices according to claim 4, wherein the types of the messages include: data frames, configuration frames, header frames, and command frames.
6. The utility model provides a power system model joint simulation system based on synchrophasor measurement device which characterized in that includes:
the decoupling module is used for splitting the simulation model of the power system into at least two sub-models according to the decoupling points of the alternating current transmission line, and respectively deploying the sub-models in at least two simulators;
the acquisition module is used for acquiring a global synchronous phasor based on a zero crossing point synchronous phase angle measurement algorithm and acquiring an electric energy signal according to the global synchronous phasor;
and the transmitting module is used for transmitting the electric energy signal to each sub-model and executing joint simulation of each sub-model according to the electric energy signal.
7. The synchrophasor-measurement-device-based power system model joint simulation system according to claim 6, wherein the acquisition module comprises:
the first acquisition unit is used for acquiring alternating current signals of bus voltage at each sub-model interface after filtering;
the conversion unit is used for carrying out analog-to-digital conversion on the alternating current signal to obtain a digital alternating current signal;
and the second acquisition unit is used for acquiring the global synchronous phasor based on the zero crossing point synchronous phase angle measurement algorithm according to the digitized alternating current signal.
8. The synchrophasor-measurement-device-based power system model joint simulation system according to claim 7, wherein the second acquisition unit includes:
the acquisition subunit is used for comparing the zero crossing point moment of the digital alternating current signal with the second pulse of the GPS-OEM receiving module to acquire a positive sequence voltage phase angle corresponding to the digital alternating current signal;
a calculating subunit, configured to determine one of the positive-sequence voltage phase angles as a reference phase angle, and calculate phase angle differences between the remaining positive-sequence voltage phase angles and the reference phase angle;
and the synchronization subunit is used for synchronizing the rest positive sequence voltage phase angles according to the phase angle difference to acquire the global synchronous phasors.
9. The synchrophasor-measurement-device-based power system model joint simulation system according to claim 6, wherein the transmission module includes:
the assembly unit is used for assembling the electric energy signals into messages according to an IEEE C37.118 protocol;
and the sending unit is used for sending the message to each submodel through an optical fiber Aurora protocol.
10. The synchronous phasor measurement device-based power system model joint simulation system of claim 9, wherein the type of the message comprises: data frames, configuration frames, header frames, and command frames.
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