Power system test simulation method, device, equipment, storage medium and product

Abstract

The invention discloses a power system test simulation method, device and equipment, a storage medium and a product, and relates to the technical field of power systems. The method comprises the following steps: for each to-be-tested equipment simulation model in a to-be-tested simulation system, obtaining an impedance value of the to-be-tested equipment simulation model under a target frequency; for each to-be-tested equipment simulation model under the target frequency, an equivalent substitution circuit is established according to the corresponding impedance value, and the impedance data of the equipment is objectively acquired, so that the equivalent substitution circuit can reflect the real characteristics of the system; the equivalent substitution circuits are connected to the access positions of the corresponding to-be-tested equipment simulation models in the to-be-tested simulation system in a one-to-one correspondence mode, and a substitution simulation system is obtained; the alternative simulation system is tested, the operation stability of the alternative simulation system under the target frequency is obtained, and due to the fact that the equivalent alternative circuits corresponding to the multiple devices are connected at the same time, modeling of the collection system can be more accurate, and the stability result is more persuasive.

Description

Technical Field

[0001] The present application relates to the technical field of power systems, and in particular, to a power system test simulation method, device, equipment, storage medium, and product. Background Technique

[0002] In the related art, the network after the equipment is connected to the power grid is called a collection system. To make the complete collection system operate stably, it is required that each equipment must operate stably after being connected to the grid. In the related art, the stability of the complete collection system is evaluated by analyzing the operating stability of each equipment after being connected to the grid.

[0003] However, in the related art, there are many types of equipment connected in the collection system, including source-network-load-storage, and the number of each type of equipment connected is large. Analyzing the operating stability of each equipment after being connected to the grid alone cannot reasonably reflect whether the entire system can operate stably.

[0004] Therefore, how to more accurately evaluate the overall operating stability of the collection system is an urgent problem to be solved currently. Summary of the Invention

[0005] The main purpose of the present application is to provide a power system test simulation method, device, equipment, storage medium, and product, aiming to solve the technical problem of how to more accurately evaluate the overall operating stability of the collection system.

[0006] To achieve the above object, the present application proposes a power system test simulation method, and the power system test simulation method includes: For each device simulation model to be tested in the simulation system to be tested, obtain the impedance value of the device simulation model to be tested at the target frequency; For each of the device simulation models to be tested at the target frequency, establish an equivalent substitution circuit according to the corresponding impedance value; Connect each of the equivalent substitution circuits one by one to the access position of the corresponding device simulation model to be tested in the simulation system to be tested, to obtain a substitution simulation system; wherein, the operating frequency of the power grid to which the substitution simulation system belongs is the target frequency; Test the substitution simulation system to obtain the operating stability of the substitution simulation system at the target frequency.

[0007] In some embodiments, the obtaining the impedance value of the device simulation model to be tested at the target frequency for each device simulation model to be tested in the simulation system to be tested includes: For each device simulation model to be tested in the simulation system to be tested, connect an ideal voltage source at the access position corresponding to the system to be tested; Superimpose a signal perturbation on the ideal voltage source, and collect the impedance of the device under test at multiple discrete frequencies respectively; or For each device under test simulation model in the device under test simulation system, obtaining the impedance value of the device under test simulation model at the target frequency includes: According to the topological structure between the device under test simulation models in the device under test simulation system, the device parameters of each device under test simulation model, and the control strategy, calculate the impedance values of each device under test simulation model within the target frequency range; wherein, the device parameters include the parameter values corresponding to each electronic component in the device under test simulation model, and the control strategy is used to characterize the control logic for each electronic component in the device under test simulation model, and / or is used to characterize the control logic between each electronic component in the device under test simulation model.

[0008] In some embodiments, for each device under test at the target frequency, establishing an equivalent substitution circuit includes: For each device under test at the target frequency, calculate the admittance corresponding to the equivalent substitution circuit according to the corresponding impedance value and impedance angle; Determine the reciprocal of the real part of the admittance as the resistance value of the equivalent resistor in the equivalent substitution circuit; According to the imaginary part of the admittance and the magnitude of the impedance angle, calculate the inductance value of the inductor or the capacitance value of the capacitor in the equivalent substitution circuit; Establish the equivalent substitution circuit according to the resistance value and inductance value, or according to the resistance value and capacitance value.

[0009] In some embodiments, the admittance corresponding to the equivalent substitution circuit is represented by Expression 1: Expression 1:

[0010] Wherein, is the impedance value, is the target frequency, is the impedance angle, is the admittance, is the real part of the admittance, is the imaginary part of the admittance; The calculating the inductance value of the inductor or the capacitance value of the capacitor in the equivalent substitution circuit according to the imaginary part of the admittance and the magnitude of the impedance angle includes: When the magnitude of the impedance angle is in the first angle interval, the equivalent substitution circuit includes a parallel-connected inductor, and the inductance value of the inductor is represented by Expression 2: Expression 2:

[0011] When the magnitude of the impedance angle is in the second angle range, the equivalent substitution circuit includes the capacitor connected in parallel, and the capacitance value of the capacitor is represented by Expression Three: Expression Three:

[0012] Wherein, is the inductance value of the inductor, is the capacitance value of the capacitor.

[0013] In some embodiments, for each of the simulation models of the devices under test at the target frequency, establishing an equivalent substitution circuit according to the corresponding impedance value includes: For each of the simulation models of the devices under test at the target frequency, calculating the admittance of the equivalent substitution circuit according to the corresponding impedance value and impedance angle; According to the control transfer function of PI control, determining the functional relationship between the current and voltage corresponding to the device under test, and the functional relationship is represented by Expression Four: Expression Four:

[0014] Wherein, is the target frequency, is the current, is the voltage, is the proportional coefficient, is the integral time constant; Calculated by Expression Five: Expression Five:

[0015] Calculated by Expression Six: Expression Six:

[0016] Wherein, is the impedance value, is the impedance angle; Establishing a controlled power source circuit according to the functional relationship between the current and voltage as the equivalent substitution circuit.

[0017] In some embodiments, testing the alternative simulation system to obtain the operating stability of the alternative simulation system at the target frequency includes: When the operating frequency of each equivalent substitution circuit in the alternative simulation system is adjusted to the target frequency, starting the test to obtain the operating stability of the alternative simulation system at the target frequency.

[0018] In addition, to achieve the above object, the present application further provides a power system test and simulation device, which includes: An impedance acquisition module, configured to acquire the impedance value of each device simulation model to be tested in a simulation system to be tested at a target frequency; A circuit construction module, configured to establish an equivalent substitution circuit according to the corresponding impedance value for each of the device simulation models to be tested at the target frequency; A circuit substitution module, configured to connect each of the equivalent substitution circuits to the access position of the corresponding device simulation model in the simulation system to be tested one by one, so as to obtain a substitution simulation system; wherein, the operating frequency of the power grid to which the substitution simulation system belongs is the target frequency; An operation test module, configured to test the substitution simulation system to obtain the operation stability of the substitution simulation system at the target frequency.

[0019] In addition, to achieve the above object, the present application further provides a power system test and simulation device, which includes: a memory, a processor, and a computer program stored on the memory and executable on the processor, and the computer program is configured to implement the steps of the power system test and simulation method as described above.

[0020] In addition, to achieve the above object, the present application further provides a storage medium, which is a computer-readable storage medium, and a computer program is stored on the storage medium, and when the computer program is executed by a processor, the steps of the power system test and simulation method as described above are implemented.

[0021] In addition, to achieve the above object, the present application further provides a computer program product, which includes a computer program, and when the computer program is executed by a processor, the steps of the power system test and simulation method as described above are implemented.

[0022] One or more technical solutions provided by the present application have at least the following technical effects: For each simulation model of the device under test in the simulation system to be tested, obtain the impedance value of the simulation model of the device under test at the target frequency; for each simulation model of the device under test at the target frequency, establish an equivalent substitution circuit according to the corresponding impedance value. Since the impedance data of the device is objectively obtained, the equivalent substitution circuit can reflect the true characteristics of the system; connect each equivalent substitution circuit to the access position of the corresponding simulation model of the device under test in the simulation system to be tested one by one to obtain a substitution simulation system; test the substitution simulation system to obtain the operating stability of the substitution simulation system at the target frequency. Since the equivalent substitution circuits corresponding to multiple devices are connected simultaneously, it can make the aggregated system modeling more accurate and the stability result more persuasive. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] The accompanying drawings herein are incorporated into and constitute a part of this specification, showing embodiments consistent with the present application and, together with the specification, are used to explain the principles of the present application.

[0024] To more clearly illustrate the technical solutions in the embodiments of the present application or in the prior art, the following will briefly introduce the accompanying drawings required for the description of the embodiments or the prior art. Obviously, for those of ordinary skill in the art, other drawings can be obtained based on these drawings without creative efforts.

[0025] Figure 1 It shows a schematic flowchart of a power system test simulation method provided by an embodiment of the present application; Figure 2 It shows a circuit diagram of an equivalent substitution circuit provided by an exemplary embodiment of the present application; Figure 3 It shows a circuit diagram of an equivalent substitution circuit provided by another exemplary embodiment of the present application; Figure 4 It shows a schematic structural diagram of a power system test simulation device provided by an embodiment of the present application; Figure 5 It shows a schematic structural diagram of a power system test simulation device provided by an embodiment of the present application.

[0026] The realization of the purpose, functional features and advantages of the present application will be further described with reference to the embodiments and the accompanying drawings. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0027] It should be understood that the specific embodiments described herein are only used to explain the technical solutions of the present application and are not used to limit the present application.

[0028] To better understand the technical solutions of the present application, the following will be described in detail with reference to the accompanying drawings of the specification and the specific embodiments.

[0029] The main solution of the embodiment of the present application is as follows: for each device simulation model to be tested in the simulation system to be tested, obtain the impedance value of the device simulation model at the target frequency; for each device simulation model at the target frequency, establish an equivalent substitution circuit according to the corresponding impedance value; connect each equivalent substitution circuit one by one to the access position of the corresponding device simulation model in the simulation system to be tested to obtain a substitution simulation system; wherein, the operating frequency of the power grid to which the substitution simulation system belongs is the target frequency; test the substitution simulation system to obtain the operating stability of the substitution simulation system at the target frequency.

[0030] In the related art, the network after the device is connected to the power grid is called the aggregation system. To make the complete aggregation system operate stably, it is required that each device must operate stably after being connected to the grid. In the related art, the stability of the complete aggregation system is evaluated by analyzing the operating stability of each device after being connected to the grid. Usually, the connection point of a single device is used as the splitting point, and the equivalent impedances of the device and the power grid are respectively viewed from the left and right sides of the splitting point. The equivalent impedance includes the amplitude-frequency and phase-frequency responses, and the frequency range is from several hertz to several kilohertz. Then, according to the Nyquist or Bode diagram stability criterion, it is judged whether there is an oscillation risk after the device is connected to the power grid.

[0031] The above method has the following deficiencies. First, the stability analysis after the device is connected to the power grid only compares the equivalent impedances of the device and the power grid, and the conclusion only stays at the theoretical-level frequency-domain analysis without completing the simulation verification in the time domain. Second, directly connecting the device to the power grid can complete the stability verification in the time domain through simulation, but it can only be realized in a simple aggregation system. There are many types of devices connected in the aggregation system, including source-network-load-storage, and the number of each type of device connected is large. It is often impossible to include the above devices simultaneously in the process of modeling the aggregation system. Usually, other devices except the device to be tested are short-circuited or open-circuited, and thus it is impossible to verify the stability of the aggregation system to which the device to be tested is connected in the time domain. Then, the frequency-related equivalent network elements developed by existing software (such as PSCAD, RSCAD, etc.) can only complete the analysis of the frequency-impedance data of a linear symmetric simple system through complex mathematical fitting methods, and the fitting effect of the frequency-impedance data of a non-linear asymmetric complex system is poor, so it is impossible to complete the equivalent substitution of complex devices. Moreover, the complexity of the simulation object (or the number of nodes) is closely related to the computing power of the simulation platform. The existing offline simulation software takes hours to complete a slightly complex network, and the real-time simulation software will limit the number of nodes of the network to achieve the effect of real-time simulation and cannot complete detailed modeling.

[0032] In summary, how to more accurately evaluate the overall operating stability of the aggregation system.

[0033] Based on this, the present application provides a solution that can achieve time-domain stability testing of a complex aggregation system including multiple types of devices such as source-network-load-storage, and avoid the above problems existing in the related art.

[0034] It should be noted that the execution subject of this embodiment can be a computing service device with data processing, network communication, and program running functions, such as a tablet computer, a personal computer, a mobile phone, etc., or a power system test and simulation device that can implement the above functions. Hereinafter, taking the power system test and simulation device as an example, this embodiment and the following embodiments will be described.

[0035] Referring to Figure 1 , Figure 1 shows a schematic flow chart of a power system test and simulation method provided by an embodiment of the present application. The power system test and simulation method can be applied to a power system test and simulation device, including the following steps S110 to step S140: Step S110, for each device simulation model to be tested in the simulation system to be tested, obtain the impedance value of the device simulation model to be tested at the target frequency.

[0036] The simulation system to be tested refers to a virtual model pre-built for the overall architecture of the system to be tested. There can be multiple device simulation models to be tested in the simulation system to be tested. The device simulation model to be tested is modeled on a simulation platform (not limited thereto) based on the main circuit topology, key parameters, control strategy, etc. of the device to be tested. Through testing in the simulation system to be tested, it is verified whether the overall formed by the device to be tested can operate reliably and stably. The simulation system to be tested can be a multi-transparency model of "black box", "gray box", and "white box", and the device simulation model to be tested can include but is not limited to a wind power generation unit, a photovoltaic power generation unit, energy storage, SVG, etc.

[0037] In some embodiments, for each device simulation model to be tested in the simulation system to be tested, an ideal voltage source can be connected at the access position (i.e., the point of common coupling) corresponding to the simulation system to be tested; a signal perturbation is superimposed on the ideal voltage source, and the impedances of the device to be tested at multiple discrete frequencies are collected respectively. Among them, the target frequency described in this embodiment is any one of the multiple discrete frequencies.

[0038] Specifically, an ideal voltage source is connected at the point of common coupling of the device, and by the method of serially superimposing a small-signal perturbation voltage on the ideal voltage source, the impedances of the device to be tested at multiple discrete frequencies are collected respectively. Similarly, the method of parallel small-signal perturbation current can be considered, which is not limited in this embodiment.

[0039] Among them, if there are singular points in the collected data, further processing is required, for example, it can be corrected by relevant linear algorithms, etc.

[0040] In some other embodiments, the impedance values of the simulation models of the devices to be tested within the target frequency range can also be calculated according to the topological structure among the simulation models of the devices to be tested, the device parameters of each device to be tested, and the control strategy. Among them, the device parameters include the parameter values corresponding to each electronic component in the simulation model of the device to be tested, such as the inductance value of an inductor, the capacitance value of a capacitor, etc.; the control strategy is used to characterize the control logic of the simulation model of the device to be tested itself, including but not limited to the control logic of each electronic component in the simulation model of the device to be tested and / or the control logic between each electronic component, such as controlling a certain switch to turn on at time A and turn off at time B, etc.

[0041] Step S120: For the simulation models of the devices to be tested at the target frequency, establish an equivalent substitution circuit according to the corresponding impedance values.

[0042] In some embodiments, the corresponding equivalent substitution circuit can be determined by the method of equivalent impedance to an RLC parallel circuit.

[0043] Specifically, for each of the devices to be tested at the target frequency, the admittance corresponding to the equivalent substitution circuit can be calculated according to the corresponding impedance value and impedance angle.

[0044] For any given angular frequency (i.e., the target frequency), the impedance value can be represented by a complex function of the impedance magnitude (|Z|) and the impedance angle (θ):

[0045] Since the admittance is the reciprocal of the impedance, the corresponding admittance expression is:

[0046] Among them, is the impedance value, is the target frequency, is the impedance angle, is the admittance, is the real part of the admittance, is the imaginary part of the admittance.

[0047] In the admittance, the real part refers to the conductance part, that is, the admittance value of the parallel resistor; the imaginary part refers to the susceptance part, that is, the admittance value of the parallel capacitor or the parallel inductor.

[0048] Determine the reciprocal of the real part of the admittance as the resistance value of the equivalent resistor in the equivalent substitution circuit, that is:

[0049] Among them, is the resistance value of the equivalent resistance.

[0050] The inductance value of the inductor or the capacitance value of the capacitor in the equivalent substitution circuit can be calculated according to the imaginary part of the admittance and the magnitude of the impedance angle.

[0051] Specifically, according to the interval where the impedance angle is located, it can be divided into the following two cases: ① When the magnitude of the impedance angle is in the first angle interval (for example ), that is, it satisfies:

[0052]

[0053] In this case, the equivalent substitution circuit includes a parallel inductor, and the inductance value of the inductor is expressed as: ② When the magnitude of the impedance angle is in the second angle interval (for example ), that is, it satisfies:

[0054]

[0055] In this case, the equivalent substitution circuit includes a parallel capacitor, and the capacitance value of the capacitor is expressed as: Among them, is the inductance value of the inductor, is the capacitance value of the capacitor.

[0056] Finally, based on the calculated resistance value and inductance value, or based on the calculated resistance value and capacitance value, an equivalent substitution circuit as shown in Figure 2 can be established.

[0057] In some other embodiments, a method of equivalent impedance to a controlled power supply circuit can also be used to determine the equivalent substitution circuit.

[0058] Specifically, in the same manner as in the foregoing embodiments, for each device under test simulation model at the target frequency, the corresponding admittance can be calculated according to the corresponding impedance value and impedance angle.

[0059] In this embodiment, the controlled current and the voltage across the controlled current source should satisfy the relationship:

[0060] If the control loop of the controlled current source adopts the PI control principle, its control transfer function can be written as

[0061] Furthermore, transforming the above formula into the frequency domain, if the voltage and current of the controlled current source are both sinusoidal signals with an angular frequency of , it can be transformed into:

[0062] where is the target frequency, is the current, is the voltage, is the proportionality coefficient, is the integration time constant.

[0063] In this embodiment, can be expressed as:

[0064] can be expressed as:

[0065] where is the impedance value, is the impedance angle.

[0066] Finally, based on the finally obtained control transfer function, an equivalent substitution circuit as shown in Figure 3 can be established.

[0067] It should be noted that in the entire simulation system to be measured, the types of the equivalent substitution circuits need to be kept consistent. That is to say, the equivalent substitution circuits corresponding to all the simulation models of the devices to be measured either adopt the RLC parallel circuit or the controlled power supply circuit.

[0068] Step S130: Connect each equivalent substitution circuit one by one to the access position of the corresponding simulation model of the device to be measured in the simulation system to be measured, and obtain a substitution simulation system.

[0069] Step S140: Test the substitution simulation system to obtain the operating stability of the substitution simulation system at the target frequency.

[0070] In this embodiment, in the software where the simulation system is located, the frequency can be set by itself. Before the simulation test, the staff can first adjust the operating frequency of each equivalent substitution circuit in the substitution simulation system to the target frequency, and then start the test to obtain the overall operating stability of the substitution simulation system at the target frequency.

[0071] Based on steps S110 to S140, the operating stability at the target frequency can be obtained. The steps in the above embodiment can be executed for any one of the aforementioned discrete frequencies (which can be pre-selected by the staff), so as to achieve the full-scale test in a certain frequency band.

[0072] This embodiment provides a power system test simulation method. For each device simulation model to be tested in the simulation system to be tested, the impedance value of the device simulation model at the target frequency is obtained. For each device simulation model at the target frequency, an equivalent substitution circuit is established according to the corresponding impedance value. Since the impedance data of the device is objectively obtained, the equivalent substitution circuit can reflect the real characteristics of the system. The equivalent substitution circuits are connected one by one to the access positions of the corresponding device simulation models in the simulation system to be tested, and a substitution simulation system is obtained. The substitution simulation system is tested to obtain the operation stability of the substitution simulation system at the target frequency. Since the equivalent substitution circuits corresponding to multiple devices are connected simultaneously, the aggregated system modeling can be more accurate and the stability result is more persuasive.

[0073] This application also provides a power system test simulation device. Please refer to Figure 4 , the power system test simulation device 100 includes: An impedance acquisition module 110, configured to obtain the impedance value of each device simulation model to be tested in the simulation system to be tested at the target frequency; A circuit construction module 120, configured to establish an equivalent substitution circuit according to the corresponding impedance value for each device simulation model at the target frequency; A circuit substitution module 130, configured to connect the equivalent substitution circuits one by one to the access positions of the corresponding device simulation models in the simulation system to be tested to obtain a substitution simulation system; wherein, the operating frequency of the power grid to which the substitution simulation system belongs is the target frequency; An operation test module 140, configured to test the substitution simulation system to obtain the operation stability of the substitution simulation system at the target frequency The power system test simulation device 100 provided by this application adopts the power system test simulation method in the above embodiment, and can solve the technical problem of how to more accurately evaluate the overall operation stability of the aggregated system. Compared with the prior art, the beneficial effects of the power system test simulation device 100 provided by this application are the same as those of the power system test simulation method provided by the above embodiment, and other technical features in the power system test simulation device 100 are the same as the features disclosed in the method of the above embodiment, and will not be elaborated here.

[0074] The present application provides a power system test and simulation device, which includes: at least one processor; and a memory communicatively connected to the at least one processor; wherein the memory stores instructions executable by the at least one processor, and the instructions are executed by the at least one processor to enable the at least one processor to execute the power system test and simulation method in the first embodiment above.

[0075] The following refers to Figure 5 , which shows a schematic structural diagram of a power system test and simulation device suitable for implementing the embodiments of the present application. The power system test and simulation device in the embodiments of the present application may include, but is not limited to, mobile terminals such as mobile phones, laptop computers, digital broadcast receivers, PDAs (Personal Digital Assistants), PADs (Portable Application Descriptions), PMPs (Portable Media Players), vehicle-mounted terminals (such as vehicle-mounted navigation terminals), etc., and fixed terminals such as digital TVs, desktop computers, etc. Figure 5 The power system test and simulation device shown is merely an example and should not impose any limitation on the functions and usage scope of the embodiments of the present application.

[0076] As Figure 5As shown, the power system test and simulation device 200 may include a processing device 210 (such as a central processing unit, a graphics processing unit, etc.), which can perform various appropriate actions and processes according to a program stored in a read-only memory (ROM: Read Only Memory) 220 or a program loaded from a storage device 230 into a random access memory (RAM: Random Access Memory) 240. In the RAM 240, various programs and data required for the operation of the power system test and simulation device are also stored. The processing device 210, the ROM 220, and the RAM 240 are connected to each other through a bus 250. An input / output (I / O) interface 260 is also connected to the bus. Generally, the following systems may be connected to the I / O interface 260: an input device 270 including, for example, a touch screen, a touchpad, a keyboard, a mouse, an image sensor, a microphone, an accelerometer, a gyroscope, etc.; an output device 280 including, for example, a liquid crystal display (LCD: Liquid Crystal Display), a speaker, a vibrator, etc.; a storage device 230 including, for example, a magnetic tape, a hard disk, etc.; and a communication device 290. The communication device 290 may allow the power system test and simulation device to communicate with other devices wirelessly or wiredly to exchange data. Although the figure shows a power system test and simulation device having various systems, it should be understood that it is not required to implement or have all the shown systems. Instead, more or fewer systems may be implemented or had.

[0077] In particular, according to the embodiments disclosed in the present application, the processes described above with reference to the flowcharts can be implemented as computer software programs. For example, the embodiments disclosed in the present application include a computer program product, which includes a computer program carried on a computer-readable medium, and the computer program contains program codes for executing the methods shown in the flowcharts. In such an embodiment, the computer program can be downloaded and installed from a network through the communication device, or installed from the storage device 230, or installed from the ROM 220. When the computer program is executed by the processing device 210, the above-mentioned functions defined in the methods of the embodiments disclosed in the present application are executed.

[0078] The power system test and simulation device provided by the present application adopts the power system test and simulation method in the above embodiment, and can solve the technical problem of how to more accurately evaluate the overall operation stability of the aggregation system. Compared with the prior art, the beneficial effects of the power system test and simulation device provided by the present application are the same as those of the power system test and simulation method provided by the above embodiment, and other technical features in the power system test and simulation device are the same as those disclosed in the method of the previous embodiment, and will not be elaborated here.

[0079] It should be understood that each part disclosed in this application can be implemented by hardware, software, firmware, or a combination thereof. In the description of the above embodiments, specific features, structures, materials, or characteristics can be combined in a suitable manner in any one or more embodiments or examples.

[0080] As mentioned above, the above are only specific embodiments of this application, but the protection scope of this application is not limited thereto. Any person skilled in the art within the technical scope disclosed in this application can easily think of changes or substitutions, which should all be covered within the protection scope of this application. Therefore, the protection scope of this application should be subject to the protection scope of the claims.

[0081] This application provides a computer-readable storage medium having computer-readable program instructions (i.e., computer programs) stored thereon, and the computer-readable program instructions are used to execute the power system test and simulation method in the above embodiments.

[0082] The computer-readable storage medium provided by this application can be, for example, a USB flash drive, but is not limited to electrical, magnetic, optical, electromagnetic, infrared, or semiconductor systems or devices, or any combination of the above. More specific examples of the computer-readable storage medium may include, but are not limited to: electrical connections with one or more wires, portable computer disks, hard disks, random access memory (RAM), read-only memory (ROM), erasable programmable read-only memory (EPROM) or flash memory, optical fibers, portable compact disk read-only memory (CD-ROM), optical storage devices, magnetic storage devices, or any suitable combination of the above. In this embodiment, the computer-readable storage medium can be any tangible medium that contains or stores a program, and the program can be used by or in combination with an instruction execution system or device. The program code contained on the computer-readable storage medium can be transmitted by any appropriate medium, including but not limited to: wires, optical cables, RF (Radio Frequency), etc., or any suitable combination of the above.

[0083] The above computer-readable storage medium can be included in the power system test and simulation device; it can also exist separately and not be assembled into the power system test and simulation device.

[0084] The above computer-readable storage medium carries one or more programs. When the one or more programs are executed by a power system test and simulation device, the power system test and simulation device can write computer program code for performing the operations of this application in one or more programming languages or combinations thereof. The programming languages include object-oriented programming languages such as Java, Smalltalk, C++, and also include conventional procedural programming languages such as the "C" language or similar programming languages. The program code can be executed entirely on the user's computer, partially on the user's computer, executed as an independent software package, partially on the user's computer and partially on a remote computer, or entirely on a remote computer or server. In the case of a remote computer, the remote computer can be connected to the user's computer through any type of network, including a local area network (LAN) or a wide area network (WAN), or it can be connected to an external computer (for example, by using an Internet service provider to connect through the Internet).

[0085] The flowcharts and block diagrams in the accompanying drawings illustrate the possible architectures, functions, and operations of systems, methods, and computer program products according to various embodiments of this application. In this regard, each block in the flowchart or block diagram can represent a module, a program segment, or a part of code that contains one or more executable instructions for implementing the specified logical function. It should also be noted that in some alternative implementations, the functions marked in the blocks may occur in a different order than that marked in the accompanying drawings. For example, two consecutive blocks shown may actually be executed substantially in parallel, and they may sometimes be executed in the reverse order, depending on the functions involved. It should also be noted that each block in the block diagram and / or flowchart, and the combination of blocks in the block diagram and / or flowchart, can be implemented by a dedicated hardware-based system for performing the specified functions or operations, or can be implemented by a combination of dedicated hardware and computer instructions.

[0086] The modules described in the embodiments of this application can be implemented in software or in hardware. Among them, the name of the module does not constitute a limitation to the unit itself in some cases.

[0087] The readable storage medium provided by this application is a computer-readable storage medium. The computer-readable storage medium stores computer-readable program instructions (i.e., computer programs) for executing the above-mentioned power system test simulation method, and can solve the technical problem of how to more accurately evaluate the overall operation stability of the aggregation system. Compared with the prior art, the beneficial effects of the computer-readable storage medium provided by this application are the same as those of the power system test simulation method provided by the above embodiments, and will not be elaborated here.

[0088] This application also provides a computer program product, including a computer program, and the steps of the power system test simulation method as described above are implemented when the computer program is executed by a processor.

[0089] The computer program product provided by this application can solve the technical problem of how to more accurately evaluate the overall operation stability of the aggregation system. Compared with the prior art, the beneficial effects of the computer program product provided by this application are the same as those of the power system test simulation method provided by the above embodiments, and will not be elaborated here.

[0090] The above are only some embodiments of this application, and do not limit the patent scope of this application. Any equivalent structural transformation made by using the content of the specification and drawings of this application under the technical concept of this application, or direct / indirect application in other related technical fields, is included in the patent protection scope of this application.

Claims

1. A power system test simulation method, characterized in that, The power system test simulation method includes: For each device simulation model to be tested in the simulation system to be tested, obtain the impedance value of the device simulation model at the target frequency; For each of the device simulation models at the target frequency, establish an equivalent substitution circuit according to the corresponding impedance value; Connect each of the equivalent substitution circuits to the access position of the corresponding device simulation model in the simulation system to be tested one by one to obtain a substitution simulation system; wherein, the operating frequency of the power grid to which the substitution simulation system belongs is the target frequency; Test the substitution simulation system to obtain the operating stability of the substitution simulation system at the target frequency.

2. The power system test simulation method according to claim 1, characterized in that The step of obtaining the impedance value of each device simulation model in the simulation system to be tested at the target frequency includes: For each device simulation model in the simulation system to be tested, connect an ideal voltage source at the access position corresponding to the simulation system to be tested; Superimpose a signal perturbation on the ideal voltage source and collect the impedance of the device to be tested at multiple discrete frequencies; or The step of obtaining the impedance value of each device simulation model in the simulation system to be tested at the target frequency includes: According to the topological structure between the device simulation models to be tested in the simulation system to be tested, the device parameters of each device simulation model, and the control strategy, calculate the impedance values of each device simulation model within the target frequency range; wherein, the device parameters include the parameter values corresponding to each electronic component in the device simulation model to be tested, and the control strategy is used to characterize the control logic for each electronic component in the device simulation model to be tested, and / or is used to characterize the control logic between each electronic component in the device simulation model to be tested.

3. The power system test simulation method according to claim 2, characterized in that, The step of establishing an equivalent substitution circuit according to the corresponding impedance value for each of the devices to be tested at the target frequency includes: For each of the devices to be tested at the target frequency, calculate the admittance corresponding to the equivalent substitution circuit according to the corresponding impedance value and impedance angle; Determine the resistance value of the equivalent resistor in the equivalent substitution circuit as the reciprocal of the real part of the admittance; According to the imaginary part of the admittance and the magnitude of the impedance angle, calculate the inductance value of the inductor or the capacitance value of the capacitor in the equivalent substitution circuit; Establish the equivalent substitution circuit according to the resistance value and inductance value, or according to the resistance value and capacitance value.

4. The power system test simulation method according to claim 3, characterized in that The admittance corresponding to the equivalent substitution circuit is represented by Expression One: Expression 1: wherein, is the impedance value, is the target frequency, is the impedance angle, is the admittance, is the real part of the admittance, is the imaginary part of the admittance; The step of calculating the inductance value of the inductor or the capacitance value of the capacitor in the equivalent substitution circuit according to the imaginary part of the admittance and the magnitude of the impedance angle includes: When the magnitude of the impedance angle is in the first angle range, the equivalent substitution circuit includes a parallel-connected inductor, and the inductance value of the inductor is represented by Expression Two: Expression 2: When the magnitude of the impedance angle is in the second angle range, the equivalent substitution circuit includes a parallel-connected capacitor, and the capacitance value of the capacitor is represented by Expression Three: Expression three: Among them, is the inductance value of the inductor, is the capacitance value of the capacitor.

5. The power system test simulation method according to claim 2, characterized in that, For each of the simulation models of the devices under test at the target frequency, an equivalent substitution circuit is established according to the corresponding impedance value, including: For each of the simulation models of the devices under test at the target frequency, the admittance of the equivalent substitution circuit is calculated according to the corresponding impedance value and impedance angle; According to the control transfer function of PI control, the functional relationship between the current and voltage corresponding to the device under test is determined, and the functional relationship is represented by Expression 4: Expression Four: wherein, is the target frequency, is the current, is the voltage, is the proportionality coefficient, is the integral time constant; Calculated by Expression Five: Expression Five: Calculated by Expression VI: Expression VI: wherein, is the impedance value, is the impedance angle; According to the functional relationship between the current and voltage, a controlled power supply circuit is established as the equivalent substitution circuit.

6. The power system test simulation method according to claim 1, characterized in that The testing of the substitution simulation system to obtain the operating stability of the substitution simulation system at the target frequency includes: When the operating frequency of each of the equivalent substitution circuits in the substitution simulation system is adjusted to the target frequency, the test is started to obtain the operating stability of the substitution simulation system at the target frequency.

7. A power system test and simulation device, characterized in that, The power system test simulation device includes: An impedance acquisition module, configured to acquire the impedance value of each simulation model of the device under test in the test simulation system at the target frequency; A circuit construction module, configured to establish an equivalent substitution circuit according to the corresponding impedance value for each of the simulation models of the devices under test at the target frequency; A circuit substitution module, configured to connect each of the equivalent substitution circuits to the access position of the corresponding simulation model of the device under test in the test simulation system one by one to obtain a substitution simulation system; wherein, the operating frequency of the power grid to which the substitution simulation system belongs is the target frequency; An operation test module, configured to test the substitution simulation system to obtain the operating stability of the substitution simulation system at the target frequency.

8. A power system test and simulation device, characterized in that, The power system test simulation device includes: a memory, a processor, and a computer program stored on the memory and executable on the processor, and the computer program is configured to implement the steps of the power system test simulation method according to any one of claims 1 to 6.

9. A storage medium, characterized in that, The storage medium is a computer-readable storage medium, and a computer program is stored on the storage medium, and when the computer program is executed by a processor, the steps of the power system test simulation method according to any one of claims 1 to 6 are implemented.

10. A computer program product, characterized in that, The computer program product includes a computer program, and when the computer program is executed by a processor, the steps of the power system test simulation method according to any one of claims 1 to 6 are implemented.

Images