CN115586730A - Power electronic simulation system, disturbance injection method and electronic equipment - Google Patents
Power electronic simulation system, disturbance injection method and electronic equipment Download PDFInfo
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- CN115586730A CN115586730A CN202110755028.6A CN202110755028A CN115586730A CN 115586730 A CN115586730 A CN 115586730A CN 202110755028 A CN202110755028 A CN 202110755028A CN 115586730 A CN115586730 A CN 115586730A
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- 238000002347 injection Methods 0.000 title claims abstract description 20
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- 238000005070 sampling Methods 0.000 claims abstract description 12
- 239000013307 optical fiber Substances 0.000 claims abstract description 7
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- 230000015654 memory Effects 0.000 claims description 19
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- 238000002955 isolation Methods 0.000 claims description 6
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- 230000001052 transient effect Effects 0.000 claims description 5
- 238000005259 measurement Methods 0.000 claims description 4
- 238000006243 chemical reaction Methods 0.000 claims description 3
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- 238000004590 computer program Methods 0.000 description 1
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Abstract
The embodiment of the invention discloses a power electronic simulation system, a disturbance injection method and electronic equipment, wherein the power electronic simulation system comprises: the analog merging unit card mainly comprises a signal conditioning circuit, an analog/digital (A/D) sampling circuit and a Field Programmable Gate Array (FPGA), samples and converts analog current and voltage signals output by the RTDS into digital quantities, merges the digital quantities by the FPGA and then transmits the digital quantities to the measuring device through an optical fiber. According to the invention, the voltage and current acquisition is performed without adopting a conventional power amplifier, but directly adopts an analog merging unit card, so that the influence of additional phase shift on the stability of a control system is avoided, and the cost and the volume are saved. Disturbance signals are independently injected from the analog merging unit card, so that the limitation of signal bandwidth caused by RTDS generation is avoided, or the existing control program is modified by the control system.
Description
Technical Field
The invention relates to the technical field of power electronics, in particular to a power electronic simulation system, a disturbance injection method and electronic equipment.
Background
With the large-scale grid connection of renewable energy sources represented by wind power and photovoltaic, the formation of an alternating current-direct current hybrid power grid constructed by taking high-voltage direct current transmission and flexible alternating current transmission as cores and the increase of novel electric equipment represented by electric vehicles; the "double high" of "high proportion of renewable energy" and "high proportion of power electronics" is an important trend in power systems. The oscillation characteristics of the power system in the subsynchronous frequency range and the supersynchronous frequency range are changed in a complex way, the characteristic of broadband oscillation is presented, and the stability of the traditional power grid is challenged.
In the prior art, a Real Time Digital Simulator (RTDS), a power amplifier, a measuring device, a control system, and the like are often used to form a hardware-in-the-loop simulation system to determine the oscillation frequency, so as to provide an important basis for analyzing the influence of the power electronic device accessing the power grid. The RTDS device simulates power electronic equipment, the power amplifier amplifies a current and voltage sampling signal output by the RTDS and then adapts to the measuring device, and the control system receives data of the measuring device to complete control protection of the RTDS simulated power electronic device, as shown in fig. 1. However, the power amplifier introduces extra phase shift into the sampled signal to affect the stability of the whole control system, thereby losing the meaning of hardware-in-loop simulation.
Disclosure of Invention
Therefore, the technical problem to be solved by the present invention is to overcome the defect in the prior art that the power amplifier introduces an extra phase shift in the sampling signal to affect the stability of the whole control system, thereby losing the meaning of hardware-in-loop simulation, and thus, a power electronic simulation system, a disturbance injection method and an electronic device are provided.
According to a first aspect, an embodiment of the present invention provides a power electronics simulation system, comprising: the analog merging unit card mainly comprises a signal conditioning circuit, an analog/digital (A/D) sampling circuit and a Field Programmable Gate Array (FPGA), samples and converts analog current and voltage signals output by the RTDS into digital quantities, merges the digital quantities by the FPGA and then transmits the digital quantities to the measuring device through an optical fiber.
In one embodiment, the measuring device mainly collects the current and voltage and transmits the collected current and voltage to the control protection device.
In one embodiment, the control protection device mainly completes control and protection of the power electronic system and outputs a control command to the valve control device.
In one embodiment, the method comprises: the valve control device mainly receives a command for controlling protection and outputs a pulse command of a power electronic device in the RTDS simulated power electronic device.
According to a second aspect, an embodiment of the present invention provides a power system disturbance injection method, which is used for the power electronic simulation system described in the first aspect or any implementation manner of the first aspect, and includes the following steps:
running a power flow simulation software by the computer, building a local power grid model by using the obtained power grid data, simulating the power flow distribution condition, and connecting with RTDS equipment through a network port;
an LCC-HVDC electromagnetic transient model is built in the RTDS to simulate the work of a converter valve;
the RTDS connects the simulated converter valve with the valve control device through an isolation digital input card (GTDI) plate, and receives a pulse command of the valve control device;
the RTDS is connected with the analog merging unit card through an isolation analog output card (GTAO) port and outputs an analog signal of current/voltage sampling;
an external disturbance source is injected into the analog merging unit card to realize the injection of small disturbance signals;
the analog merging unit card receives analog signals and disturbing signals of current/voltage sampling, performs A/D conversion, superposition coupling and FPGA data merging, and sends the analog signals and the disturbing signals to the measuring device through an optical fiber;
the measuring device receives the signal of the analog merging unit card and transmits the signal to the control protection device;
the control protection device completes the control and protection of the power electronic system according to the measurement information and outputs a control command to the valve control device;
the valve control device receives a command for controlling protection and outputs a pulse command of a power electronic device in the power electronic device simulated by RTDS;
and (4) adjusting the frequency of the disturbance source step by step until the system broadband oscillation frequency is determined.
In one embodiment, the disturbance source can realize the coupling of the analog small signal of 0.1Hz-20kHz and the current/voltage signal of the analog power electronic device in the RTDS, and output the coupled signal to the fitting combination unit card, or directly adopt an external signal source to generate the analog signal, and combine and couple the analog signal and the current/voltage signal at the analog combination unit card to reduce the influence on the RTDS or the control system.
According to a third aspect, embodiments provide a computer-readable storage medium having stored thereon computer instructions for causing a computer to perform the power system disturbance injection method of any of claims 5 to 6.
According to a fourth aspect, an embodiment of the present invention provides an electronic device, including: the power system disturbance injection method according to any one of the second aspect or the second aspect is implemented by a modular multilevel converter according to any one of the first aspect or any one of the first aspect, a memory and a processor, wherein the power electronic simulation system, the memory and the processor are communicatively connected to each other, the memory stores computer instructions, and the processor executes the computer instructions to execute the power system disturbance injection method according to any one of the second aspect or any one of the second aspect.
The technical scheme of the invention has the following advantages:
according to the power electronic simulation system, the disturbance injection method and the electronic equipment in the embodiment of the invention, the voltage and current acquisition of the system does not adopt a conventional power amplifier, but directly adopts an analog merging unit card, so that the influence of additional phase shift on the stability of a control system is avoided, and meanwhile, the cost and the volume are saved. Disturbance signals are independently injected from the analog merging unit card, so that the limitation of signal bandwidth caused by RTDS generation is avoided, or the existing control program is modified by the control system.
Drawings
In order to more clearly illustrate the embodiments of the present invention 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, and it is obvious that the drawings in the following description are some embodiments of the present invention, and other drawings can be obtained by those skilled in the art without creative efforts.
FIG. 1 is a schematic diagram of a power electronic transient simulation system according to an embodiment of the present invention;
FIG. 2 is a schematic diagram of a power electronic simulation system according to an embodiment of the present invention;
FIG. 3 is a block diagram of an exemplary embodiment of an analog merge unit card;
fig. 4 is a hardware schematic diagram of an electronic device in an embodiment of the invention.
Detailed Description
The technical solutions of the present invention will be described clearly and completely with reference to the accompanying drawings, and it is to be understood that the described embodiments are only a part of the embodiments of the present invention, 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 invention.
In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc., indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are only for convenience of description and simplicity of description, but do not indicate or imply that the device or element being referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus, should not be construed as limiting the present invention. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.
In the description of the present invention, it should be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, e.g., as meaning either a fixed connection, a removable connection, or an integral connection; can be mechanically or electrically connected; the two elements may be directly connected or indirectly connected through an intermediate medium, or may be communicated with each other inside the two elements, or may be wirelessly connected or wired connected. The specific meanings of the above terms in the present invention can be understood in specific cases to those skilled in the art.
Furthermore, the technical features involved in the different embodiments of the present invention described below may be combined with each other as long as they do not conflict with each other.
The embodiment of the invention provides a power electronic simulation system, which consists of a computer, RTDS equipment, a simulation merging unit card, a measuring device, a control protection device and a valve control device, and is shown in figure 2.
The computer runs the power flow simulation software, and simulates the power flow distribution condition of a local power grid by using the obtained power grid data.
The RTDS equipment in this application is based on RSCAD/EMTDC electromagnetic transient state simulation technique, mainly is used for setting up, emulation power electronic system's converter or converter valve, for example: wind power generation converters, direct current transmission system (HVDC) converter valves, etc., and outputs necessary control information such as current and voltage of the devices.
The analog merging unit card mainly comprises a signal conditioning circuit, an analog/digital (A/D) sampling circuit and a Field Programmable Gate Array (FPGA), samples and converts analog current and voltage signals output by the RTDS into digital quantities, merges the digital quantities through the FPGA, and then transmits the digital quantities to a measuring device through an optical fiber, as shown in figure 3.
The measuring device mainly realizes the collection of current and voltage and transmits the current and voltage to the control protection device.
The control protection device mainly completes control and protection of a power electronic system and outputs a control command to the valve control device.
The valve control device mainly receives a command for controlling protection and outputs a pulse command of a power electronic device in the RTDS simulation power electronic device.
The disturbance source can realize the coupling of a small analog signal of 0.1Hz-20kHz and a current/voltage signal of an analog power electronic device in the RTDS and output the coupled signal to a fitting merging unit card, or directly adopts an external signal source to generate an analog signal, and the analog signal is combined and coupled into the current and voltage signals at the analog merging unit card to reduce the influence on the RTDS or a control system.
Based on the same concept, the embodiment of the invention also provides a power system disturbance injection method, which is described by taking LCC-HVDC simulation as an example:
running a power flow simulation software by the computer, building a local power grid model by using the obtained power grid data, simulating the power flow distribution condition, and connecting with RTDS equipment through a network port;
an LCC-HVDC electromagnetic transient model is built in the RTDS to simulate the work of a converter valve;
the RTDS connects the simulated converter valve with the valve control device through an isolation digital input card (GTDI) plate, and receives a pulse command of the valve control device;
the RTDS is connected with the analog merging unit card through an isolation analog output card (GTAO) port and outputs an analog signal of current/voltage sampling;
an external disturbance source is injected into the analog merging unit card to realize the injection of small disturbance signals;
the analog merging unit card receives analog signals and disturbing signals of current/voltage sampling, performs A/D conversion, superposition coupling and FPGA data merging, and sends the analog signals and the disturbing signals to the measuring device through an optical fiber;
the measuring device receives the signal of the analog merging unit card and transmits the signal to the control protection device;
the control protection device completes the control and protection of the power electronic system according to the measurement information and outputs a control command to the valve control device;
the valve control device receives a command for controlling protection and outputs a pulse command of a power electronic device in the power electronic device simulated by RTDS;
and (4) adjusting the frequency of the disturbance source step by step until the system broadband oscillation frequency is determined.
The connection mode of the hardware-in-the-loop simulation system of the invention is protected, namely: the method of replacing the power amplifier with high cost and large volume by the analog merging unit card. The method for independently injecting the disturbance signals from the analog merging unit card is protected.
Based on the same concept, the embodiment of the present invention further provides an electronic device, as shown in fig. 4, which may include a processor 41, a memory 42 and a modular multilevel converter 43, wherein the processor 41, the memory 42 and the power electronic simulation system 43 may be connected by a bus or in other ways, and the connection by the bus is taken as an example in fig. 4.
The memory 42, which is a non-transitory computer readable storage medium, may be used to store non-transitory software programs, non-transitory computer executable programs, and modules, such as program instructions/modules corresponding to the power system disturbance injection method in the embodiment of the present invention. The processor 41 executes various functional applications and data processing of the processor by running non-transitory software programs, instructions and modules stored in the memory 42, namely, implements the power system disturbance injection method in the above method embodiment.
The memory 42 may include a storage program area and a storage data area, wherein the storage program area may store an operating system, an application program required for at least one function; the storage data area may store data created by the processor 41, and the like. Further, the memory 42 may include high speed random access memory, and may also include non-transitory memory, such as at least one magnetic disk storage device, flash memory device, or other non-transitory solid state storage device. In some embodiments, memory 42 may optionally include memory located remotely from processor 41, which may be connected to processor 41 via a network. Examples of such networks include, but are not limited to, the power grid, the internet, intranets, local area networks, mobile communication networks, and combinations thereof.
The one or more modules are stored in the memory 42 and, when executed by the processor 41, perform the steps of the power system disturbance injection method in an embodiment.
The details of the electronic device may be understood by referring to the corresponding descriptions and effects in the embodiments shown in fig. 1 to fig. 3, and are not described herein again.
It will be understood by those skilled in the art that all or part of the processes of the methods of the embodiments described above can be implemented by a computer program, which can be stored in a computer-readable storage medium, and when executed, can include the processes of the embodiments of the methods described above. The storage medium may be a magnetic Disk, an optical Disk, a Read-Only Memory (ROM), a Random Access Memory (RAM), a Flash Memory (Flash Memory), a Hard Disk Drive (Hard Disk Drive, abbreviated as HDD), or a Solid State Drive (SSD); the storage medium may also comprise a combination of memories of the kind described above.
It should be understood that the above examples are only for clarity of illustration and are not intended to limit the embodiments. Other variations and modifications will be apparent to persons skilled in the art in light of the above description. This need not be, nor should it be exhaustive of all embodiments. And obvious variations or modifications derived therefrom are intended to be within the scope of the invention.
Claims (8)
1. A power electronic simulation system, comprising: the analog merging unit card mainly comprises a signal conditioning circuit, an analog/digital (A/D) sampling circuit and a Field Programmable Gate Array (FPGA), samples and converts analog current and voltage signals output by the RTDS into digital quantities, merges the digital quantities by the FPGA and then transmits the digital quantities to the measuring device through an optical fiber.
2. The power electronic simulation system of claim 1, wherein the measurement device mainly collects current and voltage and transmits the collected current and voltage to the control protection device.
3. The power electronic simulation system of claim 2, wherein the control protection device mainly controls and protects the power electronic system and outputs a control command to the valve control device.
4. A power electronic simulation system according to claim 3, comprising: the valve control device mainly receives a command for controlling protection and outputs a pulse command of a power electronic device in the RTDS simulated power electronic device.
5. A power system disturbance injection method for a power electronic simulation system according to any one of claims 1 to 4, comprising the steps of:
running a power flow simulation software by the computer, building a local power grid model by using the obtained power grid data, simulating the power flow distribution condition, and connecting with RTDS equipment through a network port;
an LCC-HVDC electromagnetic transient model is built in the RTDS to simulate the operation of a converter valve;
the RTDS connects the simulated converter valve with the valve control device through an isolation digital input card (GTDI) plate, and receives a pulse command of the valve control device;
the RTDS is connected with the analog merging unit card through an isolation analog output card (GTAO) port and outputs an analog signal of current/voltage sampling;
an external disturbance source is injected into the analog merging unit card to realize the injection of small disturbance signals;
the analog merging unit card receives analog signals and disturbing signals of current/voltage sampling, performs A/D conversion, superposition coupling and FPGA data merging, and sends the analog signals and the disturbing signals to the measuring device through an optical fiber;
the measuring device receives the signal of the analog merging unit card and transmits the signal to the control protection device;
the control protection device completes the control and protection of the power electronic system according to the measurement information and outputs a control command to the valve control device;
the valve control device receives a command for controlling protection and outputs a pulse command of a power electronic device in the power electronic device simulated by RTDS;
and (4) adjusting the frequency of the disturbance source step by step until the system broadband oscillation frequency is determined.
6. The method according to claim 5, wherein the disturbance source is capable of coupling the analog small signal of 0.1Hz-20kHz with the current/voltage signal of the analog power electronic device in RTDS, outputting the coupled signal to the fitting unit card, or directly generating the analog signal by using an external signal source, and combining the coupled current and voltage signals at the analog combining unit card to reduce the influence on the RTDS or the control system.
7. A computer-readable storage medium storing computer instructions for causing a computer to perform the power system disturbance injection method of any of claims 5 to 6.
8. An electronic device, comprising: a power electronic simulation system according to any of the claims 1 to 4, a memory and a processor, which are communicatively connected to each other, wherein the memory has stored therein computer instructions, and the processor executes the computer instructions to perform the power system disturbance injection method according to any of the claims 5 to 6.
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| CN202110755028.6A CN115586730A (en) | 2021-07-05 | 2021-07-05 | Power electronic simulation system, disturbance injection method and electronic equipment |
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| CN202110755028.6A CN115586730A (en) | 2021-07-05 | 2021-07-05 | Power electronic simulation system, disturbance injection method and electronic equipment |
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| CN111897314A (en) * | 2020-08-31 | 2020-11-06 | 南方电网科学研究院有限责任公司 | Electromagnetic compatibility immunity testing device for controlling protection equipment |
| CN212647310U (en) * | 2020-08-31 | 2021-03-02 | 南方电网科学研究院有限责任公司 | Electromagnetic compatibility immunity testing device for controlling protection equipment |
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2021
- 2021-07-05 CN CN202110755028.6A patent/CN115586730A/en active Pending
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN103956764A (en) * | 2014-04-25 | 2014-07-30 | 国家电网公司 | Computer simulation testing system for high voltage direct current transmission equipment |
| CN109541313A (en) * | 2018-11-12 | 2019-03-29 | 南方电网科学研究院有限责任公司 | Impedance simulation scanning method and device for alternating current-direct current hybrid system |
| CN109445307A (en) * | 2018-11-15 | 2019-03-08 | 全球能源互联网研究院有限公司 | A kind of sub-synchronous oscillation inhibits the test macro and method of device Control protection system |
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