CN114825460A - Power supply switching system, method and device for electromagnetic transient real-time simulation - Google Patents

Power supply switching system, method and device for electromagnetic transient real-time simulation Download PDF

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Publication number
CN114825460A
CN114825460A CN202210384907.7A CN202210384907A CN114825460A CN 114825460 A CN114825460 A CN 114825460A CN 202210384907 A CN202210384907 A CN 202210384907A CN 114825460 A CN114825460 A CN 114825460A
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phase
voltage
switching
power supply
current
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Inventor
于思奇
沈卓轩
孙大卫
刘辉
吴林林
李蕴红
王潇
孙雅旻
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State Grid Corp of China SGCC
North China Electric Power Research Institute Co Ltd
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State Grid Corp of China SGCC
North China Electric Power Research Institute Co Ltd
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    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J3/00—Circuit arrangements for ac mains or ac distribution networks
    • H02J3/38—Arrangements for parallely feeding a single network by two or more generators, converters or transformers
    • H02J3/46—Controlling of the sharing of output between the generators, converters, or transformers
    • H02J3/466—Scheduling the operation of the generators, e.g. connecting or disconnecting generators to meet a given demand
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J2203/00—Indexing scheme relating to details of circuit arrangements for AC mains or AC distribution networks
    • H02J2203/20—Simulating, e g planning, reliability check, modelling or computer assisted design [CAD]

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Abstract

The application provides a power switching system, a method and a device for electromagnetic transient real-time simulation, wherein the system comprises: an equivalent switch and a processing module; the equivalent switch comprises: a controlled voltage source and a controlled current source; the processing module is respectively connected with the voltage source, the current source and a power supply for electromagnetic transient real-time simulation; the processing module is used for acquiring an original switching signal, three-phase current output by a voltage source, three-phase voltage input into a current source and three-phase power supply voltage of a power supply; determining a three-phase current signal corresponding to a current source and a three-phase voltage signal corresponding to a voltage source according to the original switching signal, the three-phase current, the three-phase voltage and the three-phase power supply voltage; and completing switching of a power supply for electromagnetic transient real-time simulation according to the three-phase current signals and the three-phase voltage signals. According to the electromagnetic transient simulation system, the simulation switch element is used, so that the normal operation of the magnetic transient real-time simulation can be guaranteed, and the allowable electromagnetic transient real-time simulation scale can be increased.

Description

Power supply switching system, method and device for electromagnetic transient real-time simulation
Technical Field
The application relates to the technical field of power systems, in particular to a power supply switching system, method and device for electromagnetic transient real-time simulation.
Background
Because most of the new energy generator sets are power electronic interfaces and lack active supporting capacity, large-scale new energy access can cause great influence on characteristics such as power grid voltage, power grid transient stability and power grid peak shaving. The electromagnetic transient simulation tool is an important means for analyzing and researching the power system accessed by the high-proportion new energy. For a complex power system with thousands of nodes, the simulation speed of conventional off-line simulation programs such as Matlab/Simulink and PSCAD/EMTDC is extremely slow, which is not beneficial to the promotion of research and analysis, so that a high-performance real-time simulator such as RT-LAB developed by OPAL-RT company of Canada is required.
In real-time simulators such as RT-LAB, a pre-stored matrix mode is generally adopted, namely, before the simulation is started, a node admittance matrix and a triangle decomposition thereof under various switch combinations are calculated and stored. For each decoupling subnetwork, the number of prestored matrixes and the number of switches in the subnetwork form an exponential relationship, the more the number of switches in the subnetwork is, the more the number of prestored matrixes is, and the too many prestored matrixes easily cause system storage pressure, so that electromagnetic transient real-time simulation is difficult to normally operate, and therefore the number of switches must be strictly limited. Taking RT-LAB software as an example, the total number of various switching elements such as single-phase switches, circuit breakers, power electronics, etc. in a single decoupling subnetwork generally cannot exceed 16. In a power network generally including a large number of power electronic devices, for example, a grid-connected system of a wind farm, the number of switches has a positive correlation with the network size. If the number of switches is subject to hard limits, the expansion of the system scale is affected. Therefore, the limitation of the number of switching elements has become an important bottleneck of the electromagnetic transient real-time simulation scale.
Disclosure of Invention
Aiming at the problems in the prior art, the application provides a power switching system, a method and a device for electromagnetic transient real-time simulation, and the allowable electromagnetic transient real-time simulation scale can be increased while the normal operation of the magnetic transient real-time simulation is ensured through a simulation switch element.
In order to solve the technical problem, the present application provides the following technical solutions:
in a first aspect, the present application provides a power switching system for electromagnetic transient real-time simulation, comprising: an equivalent switch and a processing module; the equivalent switch comprises: a controlled voltage source and a controlled current source; the processing module is respectively connected with the voltage source, the current source and a power supply for electromagnetic transient real-time simulation; the processing module is used for acquiring an original switching signal, three-phase current output by the voltage source, three-phase voltage input into the current source and three-phase power supply voltage of the power supply; determining a three-phase current signal corresponding to the current source and a three-phase voltage signal corresponding to the voltage source according to the original switching signal, the three-phase current, the three-phase voltage and the three-phase power supply voltage; and completing switching of the power supply according to the three-phase current signals and the three-phase voltage signals.
Further, the voltage source is a three-phase controlled voltage source.
Further, the current source is a three-phase controlled current source.
Further, each phase current source in the three-phase controlled current source is respectively connected with a resistor in parallel.
Further, the resistance value of each resistor is obtained according to a preset simulation step size, the impedance of the power supply and the fundamental frequency.
In a second aspect, the present application provides a power switching method for electromagnetic transient real-time simulation, which is implemented by applying the power switching system, and includes:
collecting original switching signals, three-phase currents output by the voltage source, three-phase voltages input into the current source and three-phase power supply voltages of the power supply;
obtaining the actual three-phase switch state corresponding to the equivalent switch according to the three-phase current and the original switch signal;
obtaining a three-phase current signal corresponding to the current source and a three-phase voltage signal corresponding to the voltage source according to the three-phase actual switching state, the three-phase current, the three-phase voltage and the three-phase power supply voltage;
and completing switching of the power supply according to the three-phase current signals and the three-phase voltage signals.
Further, the obtaining of the three-phase current signal corresponding to the current source and the three-phase voltage signal corresponding to the voltage source according to the actual three-phase on-off state, the three-phase current, the three-phase voltage and the three-phase power voltage includes:
multiplying the actual three-phase switching state and the three-phase current respectively according to three phases to obtain three-phase current signals corresponding to the current source;
and obtaining a three-phase voltage signal corresponding to the voltage source according to the three-phase actual switching state, the three-phase voltage and the three-phase power supply voltage.
Further, the obtaining of the three-phase voltage signal corresponding to the voltage source according to the actual three-phase switching state, the three-phase voltage and the three-phase power voltage includes:
when a first-phase actual switching state in the three-phase actual switching states is an off state, determining a first-phase voltage signal in the three-phase voltage signals of the voltage source as a first-phase voltage in the three-phase voltages;
when a first phase actual switching state in the three-phase actual switching states is a switching-on state, determining a first phase voltage signal in the three-phase voltage signals of the voltage source as a first phase voltage in the three-phase power voltage;
the first phase is any one of three phases.
In a third aspect, the present application provides a power switching device for electromagnetic transient real-time simulation, including:
the acquisition module is used for acquiring an original switching signal, three-phase current output by a voltage source, three-phase voltage input into a current source and three-phase power supply voltage of a power supply;
the state determining module is used for obtaining the actual three-phase switch state corresponding to the equivalent switch according to the three-phase current and the original switch signal;
the signal determining module is used for obtaining a three-phase current signal corresponding to the current source and a three-phase voltage signal corresponding to the voltage source according to the three-phase actual switch state, the three-phase current, the three-phase voltage and the three-phase power supply voltage;
and the power switching module is used for completing the switching of the power according to the three-phase current signals and the three-phase voltage signals.
In a fourth aspect, the present application 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 implements the power switching method when executing the program.
In a fifth aspect, the present application provides a computer readable storage medium having stored thereon computer instructions, which when executed, implement the power switching method.
According to the technical scheme, the power supply switching system, the power supply switching method and the power supply switching device for electromagnetic transient real-time simulation are provided. Wherein, this system includes: an equivalent switch and a processing module; the equivalent switch comprises: a controlled voltage source and a controlled current source; the processing module is respectively connected with the voltage source, the current source and a power supply for electromagnetic transient real-time simulation, wherein the processing module is used for collecting an original switching signal, three-phase current output by the voltage source, three-phase voltage input into the current source and three-phase power supply voltage of the power supply; determining a three-phase current signal corresponding to the current source and a three-phase voltage signal corresponding to the voltage source according to the original switching signal, the three-phase current, the three-phase voltage and the three-phase power supply voltage; the switching of the power supply is completed according to the three-phase current signals and the three-phase voltage signals, and the allowable electromagnetic transient real-time simulation scale can be increased while the normal operation of the magnetic transient real-time simulation is ensured through the analog switch element; specifically, the method can be applied to electromagnetic transient real-time simulation of a large-scale high-proportion new energy system, replaces the traditional power switching method based on a circuit breaker, reduces the number of switches in a simulation model, and increases the simulation scale of a real-time simulator.
Drawings
In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present application, and for those skilled in the art, other drawings can be obtained according to the drawings without creative efforts.
Fig. 1 is a schematic structural diagram of a power switching system for electromagnetic transient real-time simulation in an embodiment of the present application;
fig. 2 is a schematic diagram of a connection relationship between a power switching system and a power supply for electromagnetic transient real-time simulation in an embodiment of the present application;
fig. 3 is a schematic logical diagram of a connection relationship between a power switching system and a power supply for electromagnetic transient real-time simulation in an embodiment of the present application;
fig. 4 is a schematic flow chart of a power switching method for electromagnetic transient real-time simulation in an embodiment of the present application;
FIG. 5 is a logic diagram of a current zero crossing detection module in an embodiment of the present application;
FIG. 6 is a schematic flow chart of a power switching method for electromagnetic transient real-time simulation in another embodiment of the present application;
FIG. 7 is a schematic diagram of a comparison of the variation of the A-phase voltage of a power supply measured by the prior art and an exemplary method of switching the power supply;
FIG. 8 is a graph illustrating the phase change of the A-phase current of a power supply measured by the prior art and an exemplary power-on-off method of the present application;
fig. 9 is a schematic structural diagram of a power switching device for electromagnetic transient real-time simulation in an embodiment of the present application;
fig. 10 is a schematic block diagram of a system configuration of an electronic device according to an embodiment of the present application.
Detailed Description
In order to make those skilled in the art better understand the technical solutions in the present specification, the technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application, and it is obvious that the described embodiments are only a part of the embodiments of the present application, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present application.
In the prior art, mainstream electromagnetic transient real-time simulation tools adopt numerical solving methods such as an implicit trapezoidal integral method and a backward euler method to model and solve a complex power network. In the framework of this method, the switching of the states of the switching elements in the circuit leads to a reconstruction and a re-trigonometric decomposition of the nodal admittance matrix. The process consumes high computational resources, and if the computation is performed within one step, the real-time computational performance of the simulator can be greatly reduced. Therefore, in real-time simulators such as RT-LAB, a pre-stored matrix approach is generally adopted.
At present, the switching mode of a power supply in a real-time simulation program is switched by switching elements such as a circuit breaker, and a system for switching the power supply without adopting the switching elements does not exist. In order to solve the problems, the application provides a power switching system, a method and a device which are suitable for electromagnetic transient real-time simulation software; a pair of voltage source-current source is adopted to simulate the switching-on and switching-off processes of the switching elements, so that the number of the switching elements in the model is effectively reduced on the premise of hardly influencing the simulation precision, and the simulation scale of the conventional real-time simulator can be increased.
In order to improve the allowable electromagnetic transient real-time simulation scale while ensuring the normal operation of the magnetic transient real-time simulation, an embodiment of the application provides a power supply switching device for the electromagnetic transient real-time simulation, where the device may be a server or a client device, and the client device may include a smart phone, a tablet electronic device, a network set-top box, a portable computer, a desktop computer, a Personal Digital Assistant (PDA), a vehicle-mounted device, an intelligent wearable device, and the like. Wherein, intelligence wearing equipment can include intelligent glasses, intelligent wrist-watch and intelligent bracelet etc..
In practical applications, the power switching for electromagnetic transient real-time simulation may be performed on the server side as described above, or all operations may be performed in the client device. The selection may be specifically performed according to the processing capability of the client device, the limitation of the user usage scenario, and the like. This is not a limitation of the present application. The client device may further include a processor if all operations are performed in the client device.
The client device may have a communication module (i.e., a communication unit), and may be communicatively connected to a remote server to implement data transmission with the server. The server may include a server on the task scheduling center side, and in other implementation scenarios, the server may also include a server on an intermediate platform, for example, a server on a third-party server platform that is communicatively linked to the task scheduling center server. The server may include a single computer device, or may include a server cluster formed by a plurality of servers, or a server structure of a distributed apparatus.
The server and the client device may communicate using any suitable network protocol, including network protocols not yet developed at the filing date of this application. The network protocol may include, for example, a TCP/IP protocol, a UDP/IP protocol, an HTTP protocol, an HTTPS protocol, or the like. Of course, the network Protocol may also include, for example, an RPC Protocol (Remote Procedure Call Protocol), a REST Protocol (Representational State Transfer Protocol), and the like used above the above Protocol.
The following examples are intended to illustrate the details.
In order to improve the allowable electromagnetic transient real-time simulation scale while ensuring the normal operation of the magnetic transient real-time simulation, as shown in fig. 1 to 3, the present embodiment provides a power switching system, an execution main body of which is used for the electromagnetic transient real-time simulation, and the power switching system includes: an equivalent switch 1 and a processing module 2; the equivalent switch 1 comprises: a voltage source 11 and a current source 12; the processing module 2 is respectively connected with the voltage source 11, the current source 12 and a power supply 3 for electromagnetic transient real-time simulation; the processing module is used for acquiring an original switching signal, three-phase current output by the voltage source, three-phase voltage input into the current source and three-phase power supply voltage of the power supply; determining a three-phase current signal corresponding to the current source and a three-phase voltage signal corresponding to the voltage source according to the original switching signal, the three-phase current, the three-phase voltage and the three-phase power supply voltage; and completing switching of the power supply according to the three-phase current signals and the three-phase voltage signals.
Wherein the voltage source may be a three-phase controlled voltage source. The current source may be a three-phase controlled current source. Each phase current source in the three-phase controlled current source can be respectively connected with a resistor in parallel. The resistance value of each resistor may be derived from the simulation step size, the impedance of the power supply and the fundamental frequency. The power supply for electromagnetic transient real-time simulation can be a power supply of electromagnetic transient real-time simulation software, and can be a three-phase power supply. The electromagnetic transient real-time simulation software can be an existing RT-LAB real-time simulator and the like.
The parallel resistance R of each phase current source has the function of enhancing the numerical stability of the model, and the value of R needs to be selected according to parameters such as power source impedance, simulation step length and the like; specifically, the value of R can be obtained according to the following formula:
Figure BDA0003594534640000061
wherein X is the impedance of the power supply; f is a fundamental frequency; delta t is a simulation step length; k is an adjustable parameter, and is generally selected from (0.01-1).
Specifically, the power switching system provided in this embodiment may be composed of two parts, namely, an equivalent switch and a calculation processing module, where the calculation processing module may be equivalent to the processing module, including but not limited to a server; as shown in fig. 3, the equivalent switch 1 is controlled by a three-phase voltage source v a 、v b 、v c And a three-phase controlled current source i a 、i b 、i c The voltage source is connected with the power supply side 3 through an interface, the current source is connected with the system side through interfaces a, b and c, and each phase of current source is connected with a resistor R in parallel. In addition, the three-phase voltage v must be detected on the system side Mabc Detecting three-phase current i on the power supply side Mabc ；X s Representing the internal resistance of a non-ideal three-phase power supply.
As can be seen from the above description, the power switching system for electromagnetic transient real-time simulation provided in this embodiment controls the controlled voltage source and the controlled current source to output corresponding voltage and current after the original switching signal is processed by the processing module, so as to implement an equivalent switching function.
In order to improve the allowable electromagnetic transient real-time simulation scale while ensuring the normal operation of the magnetic transient real-time simulation, the embodiment provides a power switching method for the electromagnetic transient real-time simulation, in which an execution main body is a power switching device for the electromagnetic transient real-time simulation, the power switching device for the electromagnetic transient real-time simulation includes, but is not limited to, a server, and functions implemented by the power switching device may be equivalent to functions implemented by the processing module, as shown in fig. 4, the method specifically includes the following contents:
step 100: and acquiring an original switching signal, three-phase current output by the voltage source, three-phase voltage input into the current source and three-phase power supply voltage of the power supply.
Specifically, the original switch signal may represent a target state of the equivalent switch, that is, a state that the equivalent switch is expected to be achieved is preset according to actual needs, and the original switch signal sent by the front end of the power switching device may be received; the target state may be an on or off state; the original switch signal is actively given out in an electromagnetic transient simulation program by a user through the on-off time of the switch which is actually required; the three-phase voltage and the three-phase current can be obtained through a voltmeter module and an ammeter module which are arranged in an electromagnetic transient simulation program.
Step 200: and obtaining the actual three-phase switching state corresponding to the equivalent switch according to the three-phase current and the original switching signal.
Specifically, three-phase current i Mabc Delaying one simulation step length; the current zero-crossing detection module in the power switching device uses the original switch signal S0 and the delayed i Mabc For signals, the three-phase actual switching state S of the equivalent switch is obtained by calculation according to the principle of' instantaneous switching-on and current zero-crossing switching-off abc 。
FIG. 5 is a logic diagram of a current zero crossing detection module, which inputs the original switching signal S0 and an arbitrary phase current i delayed by one step Mj(j＝a,b,c) The output corresponds to 'instantaneous on, current zero cross off', the phase switch state S j(j＝a,b,c) . The module principle is as follows:
1)i Mj the absolute value is obtained through an abs module, and if the absolute value is smaller than a zero-crossing current threshold I 0 If the phase current is zero-crossing, the logic value 1 is output, AND the AND gate AND is entered.
2) S0 is input to AND gate AND through NOT gate; as can be seen from the characteristics of the AND gate AND, the output of the AND gate AND is 1 if AND only if the current crosses zero AND the original switching signal is the off signal S0 equal to 0. The output enters the R port of the S-R register, so that the register outputs S j ＝0。
3) S0 is also input directly to the S terminal of the S-R register. When S0 changes from 0 to 1, that is, receives an ON signal, the S terminal of the register is 1, and 2) the R terminal of the register is 0, and the register outputs S according to the characteristics of the S-R register j 1, thereby realizing instant opening; when S0 changes from 1 to 0, i.e. receives a turn-off signal, when and only whenWhen the current crosses zero AND S0 is equal to 0, the AND gate outputs 1, the register outputs S according to the characteristics of the S-R register j And 0, thereby realizing current zero-crossing turn-off. Original switching signal S0, delayed current i Mj J-th phase switching signal (i.e. j-th phase actual switching state) S j The corresponding relationship of (a) can be seen in table 1.
TABLE 1
Original switching signal S0 Delayed current i Mj J-th phase switching signal S j
Off signal 0 i Mj＜ I 0 Off signal 0
Off signal 0 i Mj≥ I 0 On signal 1
Off signal 1 i Mj＜ I 0 On signal 1
Off signal 1 i Mj≥ I 0 On signal 1
Step 300: and obtaining a three-phase current signal corresponding to the current source and a three-phase voltage signal corresponding to the voltage source according to the three-phase actual switching state, the three-phase current, the three-phase voltage and the three-phase power supply voltage.
In particular, the actual switching state S of the three phases can be defined abc With delayed three-phase currents i Mabc Multiplying the three phases respectively to obtain a signal i of a three-phase controlled current source at the system side abc (i.e. i) a 、i b 、i c ) Determining three-phase current signals corresponding to the current source; can switch three phases into actual state S abc Three-phase supply voltage v Sabc Three-phase voltage v Mabc Determining three-phase voltage signals v as signals abc Let j be the three-phase number, j ═ a, b, c. If S j When is equal to 0, then v j ＝v Sj (ii) a If S j When 1, then v j ＝v Mj ；S j 0 means that the j (j) phase switching signal is off; v. of Sabc Is a known quantity and can be directly measured. J-th phase switching signal S j J-th phase power supply voltage v Sj Voltage v of j-th phase Mj The correspondence between them can be as shown in table 2.
TABLE 2
J-th phase switching signal S j The jth phase voltage signal v j
Off signal 0 v j ＝v Sj
Off signal 1 v j ＝v Mj
Step 400: and completing switching of the power supply according to the three-phase current signals and the three-phase voltage signals.
Specifically, the three-phase current output by the voltage source may be adjusted to the three-phase current signal, and the three-phase voltage input to the current source may be adjusted to the three-phase voltage signal, so as to complete switching of the power supply; v finally calculated by the control module abc And i abc Switching of the analog switch, S j If the value is 0, determining that the power supply is turned off; s a ＝1，S b 1, and S c The power is determined to be on 1.
To improve the accuracy of the three-phase voltage signal, referring to fig. 6, in one embodiment of the present application, step 300 comprises:
step 310: multiplying the actual three-phase switching state and the three-phase current respectively according to three phases to obtain three-phase current signals corresponding to the current source;
step 320: and obtaining a three-phase voltage signal corresponding to the voltage source according to the three-phase actual switching state, the three-phase voltage and the three-phase power supply voltage.
To improve the accuracy of the three-phase voltage signal, in one embodiment of the present application, step 320 comprises:
step 321: when a first-phase actual switching state in the three-phase actual switching states is an off state, determining a first-phase voltage signal in the three-phase voltage signals of the voltage source as a first-phase voltage in the three-phase voltages;
step 322: when a first phase actual switching state in the three-phase actual switching states is a switching-on state, determining a first phase voltage signal in the three-phase voltage signals of the voltage source as a first phase voltage in the three-phase power voltage; the first phase is any one of three phases.
As shown in fig. 7 and 8, in an example, a power source may be additionally turned on or off in a power grid having a power source and a load, and the power-on signal may be transmitted at 0.2s and the power-off signal may be transmitted at 0.25 s. As can be seen from fig. 7 and 8, compared with the conventional switching method using a circuit breaker, the power switching method provided by the present application can accurately simulate the power switching process controlled by the circuit breaker, reduce the number of switches in the simulation model, and increase the simulation scale of the real-time simulator.
In terms of software, in order to improve the allowable electromagnetic transient real-time simulation scale while ensuring the normal operation of the magnetic transient real-time simulation, the present application provides an embodiment of a power switching device for electromagnetic transient real-time simulation, which is used for implementing all or part of the contents in the power switching method for electromagnetic transient real-time simulation, and referring to fig. 9, the power switching device for electromagnetic transient real-time simulation specifically includes the following contents:
the acquisition module 10 is used for acquiring an original switching signal, three-phase current output by a voltage source, three-phase voltage input into a current source and three-phase power supply voltage of a power supply;
a state determining module 20, configured to obtain an actual three-phase switching state corresponding to the equivalent switch according to the three-phase current and the original switching signal;
a signal determining module 30, configured to obtain a three-phase current signal corresponding to the current source and a three-phase voltage signal corresponding to the voltage source according to the three-phase actual switching state, the three-phase current, the three-phase voltage, and the three-phase power supply voltage;
and the power supply switching module 40 is used for completing the switching of the power supply according to the three-phase current signal and the three-phase voltage signal.
The embodiment of the power switching device for electromagnetic transient real-time simulation provided in this specification may be specifically used to execute the processing flow of the embodiment of the power switching method for electromagnetic transient real-time simulation, and its functions are not described herein again, and refer to the detailed description of the embodiment of the power switching method for electromagnetic transient real-time simulation.
As can be seen from the above description, the power switching system, the method and the device for electromagnetic transient real-time simulation provided by the application can improve the allowable electromagnetic transient real-time simulation scale while ensuring the normal operation of the magnetic transient real-time simulation; specifically, the method can be applied to electromagnetic transient real-time simulation of a large-scale high-proportion new energy system, replaces the traditional power switching method based on a circuit breaker, reduces the number of switches in a simulation model, and increases the simulation scale of a real-time simulator.
In terms of hardware, in order to improve the allowable electromagnetic transient real-time simulation scale while ensuring the normal operation of the magnetic transient real-time simulation, the present application provides an embodiment of an electronic device for implementing all or part of the contents in the power switching method for electromagnetic transient real-time simulation, where the electronic device specifically includes the following contents:
a processor (processor), a memory (memory), a communication Interface (Communications Interface), and a bus; the processor, the memory and the communication interface complete mutual communication through the bus; the communication interface is used for realizing information transmission between the power supply switching device for electromagnetic transient real-time simulation, the user terminal and other related equipment; the electronic device may be a desktop computer, a tablet computer, a mobile terminal, and the like, but the embodiment is not limited thereto. In this embodiment, the electronic device may be implemented with reference to the embodiment of the power switching method for electromagnetic transient real-time simulation and the embodiment of the power switching device for electromagnetic transient real-time simulation, which are incorporated herein, and repeated details are omitted.
Fig. 10 is a schematic block diagram of a system configuration of an electronic device 9600 according to an embodiment of the present application. As shown in fig. 10, the electronic device 9600 can include a central processor 9100 and a memory 9140; the memory 9140 is coupled to the central processor 9100. Notably, this fig. 10 is exemplary; other types of structures may also be used in addition to or in place of the structure to implement telecommunications or other functions.
In one or more embodiments of the present application, the power switching functionality for electromagnetic transient real-time simulation may be integrated into the central processor 9100. The central processor 9100 may be configured to control as follows:
step 100: collecting an original switching signal, three-phase current output by the voltage source, three-phase voltage input into the current source and three-phase power supply voltage of the power supply;
step 200: obtaining the actual three-phase switch state corresponding to the equivalent switch according to the three-phase current and the original switch signal;
step 300: obtaining a three-phase current signal corresponding to the current source and a three-phase voltage signal corresponding to the voltage source according to the three-phase actual switching state, the three-phase current, the three-phase voltage and the three-phase power supply voltage;
step 400: and completing switching of the power supply according to the three-phase current signals and the three-phase voltage signals.
From the above description, it can be seen that the electronic device provided in the embodiments of the present application can improve the allowable electromagnetic transient real-time simulation scale while ensuring normal operation of the magnetic transient real-time simulation.
In another embodiment, the power switching device for electromagnetic transient real-time simulation may be configured separately from the central processor 9100, for example, the power switching device for electromagnetic transient real-time simulation may be configured as a chip connected to the central processor 9100, and the power switching function for electromagnetic transient real-time simulation is implemented by the control of the central processor.
As shown in fig. 10, the electronic device 9600 may further include: a communication module 9110, an input unit 9120, an audio processor 9130, a display 9160, and a power supply 9170. It is noted that the electronic device 9600 also does not necessarily include all of the components shown in fig. 10; in addition, the electronic device 9600 may further include components not shown in fig. 10, which may be referred to in the prior art.
As shown in fig. 10, a central processor 9100, sometimes referred to as a controller or operational control, can include a microprocessor or other processor device and/or logic device, which central processor 9100 receives input and controls the operation of the various components of the electronic device 9600.
The memory 9140 can be, for example, one or more of a buffer, a flash memory, a hard drive, a removable media, a volatile memory, a non-volatile memory, or other suitable device. The information relating to the failure may be stored, and a program for executing the information may be stored. And the central processing unit 9100 can execute the program stored in the memory 9140 to realize information storage or processing, or the like.
The input unit 9120 provides input to the central processor 9100. The input unit 9120 is, for example, a key or a touch input device. Power supply 9170 is used to provide power to electronic device 9600. The display 9160 is used for displaying display objects such as images and characters. The display may be, for example, an LCD display, but is not limited thereto.
The memory 9140 may be a solid-state memory, e.g., Read Only Memory (ROM), Random Access Memory (RAM), a SIM card, or the like. There may also be a memory that holds information even when power is off, can be selectively erased, and is provided with more data, an example of which is sometimes called an EPROM or the like. The memory 9140 could also be some other type of device. Memory 9140 includes a buffer memory 9141 (sometimes referred to as a buffer). The memory 9140 may include an application/function storage part 9142, the application/function storage part 9142 being used to store application programs and function programs or a flow for executing the operation of the electronic device 9600 by the central processing unit 9100.
The memory 9140 can also include a data store 9143, the data store 9143 being used to store data, such as contacts, digital data, pictures, sounds, and/or any other data used by an electronic device. The driver storage portion 9144 of the memory 9140 may include various drivers for the electronic device for communication functions and/or for performing other functions of the electronic device (e.g., messaging applications, contact book applications, etc.).
The communication module 9110 is a transmitter/receiver 9110 that transmits and receives signals via an antenna 9111. The communication module (transmitter/receiver) 9110 is coupled to the central processor 9100 to provide input signals and receive output signals, which may be the same as in the case of a conventional mobile communication terminal.
Based on different communication technologies, a plurality of communication modules 9110, such as a cellular network module, a bluetooth module, and/or a wireless local area network module, may be provided in the same electronic device. The communication module (transmitter/receiver) 9110 is also coupled to a speaker 9131 and a microphone 9132 via an audio processor 9130 to provide audio output via the speaker 9131 and receive audio input from the microphone 9132, thereby implementing ordinary telecommunications functions. The audio processor 9130 may include any suitable buffers, decoders, amplifiers and so forth. In addition, the audio processor 9130 is also coupled to the central processor 9100, thereby enabling recording locally through the microphone 9132 and enabling locally stored sounds to be played through the speaker 9131.
As can be seen from the above description, the electronic device provided in the embodiments of the present application can improve the allowable electromagnetic transient real-time simulation scale while ensuring normal operation of the magnetic transient real-time simulation.
Embodiments of the present application further provide a computer-readable storage medium capable of implementing all steps of the power supply switching method for electromagnetic transient real-time simulation in the foregoing embodiments, where the computer-readable storage medium stores a computer program, and when the computer program is executed by a processor, the computer program implements all steps of the power supply switching method for electromagnetic transient real-time simulation in the foregoing embodiments, for example, when the processor executes the computer program, the processor implements the following steps:
step 100: collecting original switching signals, three-phase currents output by the voltage source, three-phase voltages input into the current source and three-phase power supply voltages of the power supply;
step 200: obtaining the actual three-phase switch state corresponding to the equivalent switch according to the three-phase current and the original switch signal;
step 300: obtaining a three-phase current signal corresponding to the current source and a three-phase voltage signal corresponding to the voltage source according to the three-phase actual switching state, the three-phase current, the three-phase voltage and the three-phase power supply voltage;
step 400: and completing switching of the power supply according to the three-phase current signals and the three-phase voltage signals.
From the above description, it can be seen that the computer-readable storage medium provided in the embodiments of the present application can improve the allowable electromagnetic transient real-time simulation scale while ensuring normal operation of the magnetic transient real-time simulation.
In the present application, each embodiment of the method is described in a progressive manner, and the same and similar parts among the embodiments are referred to each other, and each embodiment focuses on differences from other embodiments. Reference is made to the description of the method embodiments in part.
As will be appreciated by one skilled in the art, embodiments of the present application may be provided as a method, system, or computer program product. Accordingly, the present application may take the form of an entirely hardware embodiment, an entirely software embodiment or an embodiment combining software and hardware aspects. Furthermore, the present application may take the form of a computer program product embodied on one or more computer-usable storage media (including, but not limited to, disk storage, CD-ROM, optical storage, and the like) having computer-usable program code embodied therein.
The present application is described with reference to flowchart illustrations and/or block diagrams of methods, apparatus (systems), and computer program products according to embodiments of the application. It will be understood that each flow and/or block of the flow diagrams and/or block diagrams, and combinations of flows and/or blocks in the flow diagrams and/or block diagrams, can be implemented by computer program instructions. These computer program instructions may be provided to a processor of a general purpose computer, special purpose computer, embedded processor, or other programmable data processing apparatus to produce a machine, such that the instructions, which execute via the processor of the computer or other programmable data processing apparatus, create means for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.
These computer program instructions may also be stored in a computer-readable memory that can direct a computer or other programmable data processing apparatus to function in a particular manner, such that the instructions stored in the computer-readable memory produce an article of manufacture including instruction means which implement the function specified in the flowchart flow or flows and/or block diagram block or blocks.
These computer program instructions may also be loaded onto a computer or other programmable data processing apparatus to cause a series of operational steps to be performed on the computer or other programmable apparatus to produce a computer implemented process such that the instructions which execute on the computer or other programmable apparatus provide steps for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.
The principle and the implementation mode of the present application are explained by applying specific embodiments in the present application, and the description of the above embodiments is only used to help understanding the method and the core idea of the present application; meanwhile, for a person skilled in the art, according to the idea of the present application, there may be variations in the specific embodiments and the application scope, and in summary, the content of the present specification should not be construed as a limitation to the present application.

Claims (11)

1. A power switching system for electromagnetic transient real-time simulation, comprising: an equivalent switch and a processing module; the equivalent switch comprises: a controlled voltage source and a controlled current source;
the processing module is respectively connected with the voltage source, the current source and a power supply for electromagnetic transient real-time simulation;
the processing module is used for acquiring an original switching signal, three-phase current output by the voltage source, three-phase voltage input into the current source and three-phase power supply voltage of the power supply; determining a three-phase current signal corresponding to the current source and a three-phase voltage signal corresponding to the voltage source according to the original switching signal, the three-phase current, the three-phase voltage and the three-phase power supply voltage; and completing switching of the power supply according to the three-phase current signals and the three-phase voltage signals.
2. The power switching system of claim 1, wherein the voltage source is a three-phase controlled voltage source.
3. The power switching system of claim 1, wherein the current source is a three-phase controlled current source.
4. The power switching system according to claim 3, wherein each phase current source of the three-phase controlled current source is connected in parallel with a resistor.
5. The power switching system according to claim 4, wherein the resistance value of each resistor is obtained according to a preset simulation step size, the impedance of the power supply and the fundamental frequency.
6. A power switching method for electromagnetic transient real-time simulation, which is implemented by applying the power switching system of any one of claims 1 to 5, and comprises the following steps:
collecting an original switching signal, three-phase current output by the voltage source, three-phase voltage input into the current source and three-phase power supply voltage of the power supply;
obtaining the actual three-phase switch state corresponding to the equivalent switch according to the three-phase current and the original switch signal;
obtaining a three-phase current signal corresponding to the current source and a three-phase voltage signal corresponding to the voltage source according to the three-phase actual switching state, the three-phase current, the three-phase voltage and the three-phase power supply voltage;
and completing switching of the power supply according to the three-phase current signals and the three-phase voltage signals.
7. The power switching method according to claim 6, wherein the obtaining of the three-phase current signal corresponding to the current source and the three-phase voltage signal corresponding to the voltage source according to the three-phase actual switching state, the three-phase current, the three-phase voltage and the three-phase power voltage comprises:
multiplying the actual three-phase switching state and the three-phase current respectively according to three phases to obtain three-phase current signals corresponding to the current source;
and obtaining a three-phase voltage signal corresponding to the voltage source according to the actual three-phase switching state, the three-phase voltage and the three-phase power supply voltage.
8. The power switching method for electromagnetic transient real-time simulation according to claim 7, wherein the obtaining of the three-phase voltage signal corresponding to the voltage source according to the three-phase actual switching state, the three-phase voltage and the three-phase power voltage comprises:
when a first-phase actual switching state in the three-phase actual switching states is an off state, determining a first-phase voltage signal in the three-phase voltage signals of the voltage source as a first-phase voltage in the three-phase voltages;
when a first phase actual switching state in the three-phase actual switching states is a switching-on state, determining a first phase voltage signal in the three-phase voltage signals of the voltage source as a first phase voltage in the three-phase power voltage;
the first phase is any one of three phases.
9. A power switching device for electromagnetic transient real-time simulation, comprising:
the acquisition module is used for acquiring an original switching signal, three-phase current output by a voltage source, three-phase voltage input into a current source and three-phase power supply voltage of a power supply;
the state determining module is used for obtaining the actual three-phase switch state corresponding to the equivalent switch according to the three-phase current and the original switch signal;
the signal determining module is used for obtaining a three-phase current signal corresponding to the current source and a three-phase voltage signal corresponding to the voltage source according to the three-phase actual switch state, the three-phase current, the three-phase voltage and the three-phase power supply voltage;
and the power switching module is used for completing the switching of the power according to the three-phase current signals and the three-phase voltage signals.
10. An electronic device comprising a memory, a processor and a computer program stored on the memory and executable on the processor, wherein the processor implements the power switching method of any one of claims 6 to 8 when executing the program.
11. A computer readable storage medium having computer instructions stored thereon, wherein the instructions, when executed, implement the power switching method of any one of claims 6 to 8.
CN202210384907.7A 2022-04-13 2022-04-13 Power supply switching system, method and device for electromagnetic transient real-time simulation Pending CN114825460A (en)

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CN202210384907.7A CN114825460A (en) 2022-04-13 2022-04-13 Power supply switching system, method and device for electromagnetic transient real-time simulation

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