CN113433381B - Real-time testing system and method for link delay of flexible direct-current transmission control system - Google Patents
Real-time testing system and method for link delay of flexible direct-current transmission control system Download PDFInfo
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- CN113433381B CN113433381B CN202110457986.5A CN202110457986A CN113433381B CN 113433381 B CN113433381 B CN 113433381B CN 202110457986 A CN202110457986 A CN 202110457986A CN 113433381 B CN113433381 B CN 113433381B
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Abstract
The invention discloses a real-time testing system and method for link delay of a flexible direct-current transmission control system, wherein the real-time testing system comprises the following steps: the method comprises the steps of receiving sinusoidal alternating-current voltage signals sent by a real-time simulator through a high-speed interface board through an acquisition and measurement device, performing voltage conversion, hardware filtering, digital-to-analog conversion and modulation processing, and then converting the sinusoidal alternating-current voltage signals into trigger pulse signals; sending a trigger pulse signal into a real-time simulator through an interface device, and feeding back the state information of each soft direct current converter valve submodule in the real-time simulator to a control link; and after receiving the pulse trigger signal, the trigger submodule unit outputs a corresponding trigger alternating voltage, calculates the delay between the synchronous alternating voltage signal and the trigger alternating voltage signal, and removes the delay in the high-speed interface board card and the interface device to obtain the delay of the control link. The invention can avoid the problem of difficult measurement caused by the fact that the zero crossing point cannot be accurately obtained when the input signal of the direct current control protection system is obtained or the preset voltage threshold value is required to be introduced when the zero crossing point is judged.
Description
Technical Field
The invention relates to the technical field of flexible direct current transmission, in particular to a real-time testing system and method for link delay of a flexible direct current transmission control system.
Background
Flexible direct current transmission is a novel transmission technology based on voltage source converters, self-turn-off devices and Pulse Width Modulation (PWM) technology. Compared with the traditional direct current transmission technology, the flexible direct current transmission technology has the advantages of being capable of supplying power to a passive network, free of commutation failure, easy to form a multi-terminal direct current system and the like, has huge technical advantages in application occasions such as wind power plant grid connection, asynchronous networking, urban power supply, traditional direct current operation characteristic improvement and the like, is an important technical foundation for constructing a direct current power grid and developing an energy Internet, and is one of important development directions in the field of power transmission.
The link delay of the flexible direct current control system is used as one of key parameters affecting the dynamic performance of the flexible direct current transmission and generating harmonic resonance, so that the accurate and effective test of the link delay of the flexible direct current control system has important significance for control parameter design and optimization, system harmonic resonance risk assessment and coping.
In the prior art, when the zero crossing point of the input signal of the direct current control protection system is acquired, the zero crossing point cannot be accurately acquired, so that measurement errors are caused. Or the preset voltage threshold is required to be introduced when the zero crossing point is judged, the error is overlarge due to the overlarge threshold, and the measurement is difficult due to the fact that the zero crossing point is difficult to capture due to the overlarge threshold.
Disclosure of Invention
The technical problem to be solved by the embodiment of the invention is to provide a real-time testing system and method for link delay of a flexible direct current transmission control system, which can avoid the problems that when a zero crossing point of an input signal of a direct current control protection system is acquired, the zero crossing point cannot be accurately acquired, measurement errors are caused, or a preset voltage threshold is required to be introduced when the zero crossing point is judged, the error is overlarge due to overlarge threshold, and the zero crossing point is difficult to capture due to overlarge threshold.
In order to solve the technical problems, an embodiment of the present invention provides a real-time testing system for link delay of a flexible direct current transmission control system, where the system includes:
the control link is used for receiving the sinusoidal alternating voltage signal sent by the real-time simulator through the high-speed interface board card, and converting the sinusoidal alternating voltage signal into a trigger pulse signal after voltage conversion, hardware filtering, digital-to-analog conversion and modulation processing;
the interface device is used for sending the trigger pulse signal into the real-time simulator and feeding back the state information of each soft direct current converter valve submodule in the real-time simulator to the control link;
and the real-time simulator is used for triggering a submodule unit in the converter valve model to output corresponding trigger alternating voltage after receiving the pulse trigger signal, calculating the delay of the synchronous alternating voltage signal and the trigger alternating voltage signal, and removing the delay in the high-speed interface board card and the interface device to obtain the delay of the control link.
Further, the real-time simulator is also used for building a converter valve model and an alternating current voltage source model according to engineering parameters; the voltage source port of the alternating current voltage source model is connected with the high-speed interface board card; the submodule unit in the converter valve model is a half-bridge submodule or a full-bridge submodule.
Further, the control link includes:
the acquisition and measurement device is used for carrying out voltage conversion, hardware filtering and digital-to-analog conversion on the sinusoidal alternating current synchronous signal so as to obtain an alternating current synchronous signal;
the valve group control device is used for receiving the alternating current synchronous signals and converting the alternating current synchronous signals acquired in the interrupt period into level modulation signals;
the valve control device is used for converting the received level modulation signal into a corresponding trigger pulse signal;
and the pulse distribution unit is used for sending the trigger pulse signal into the converter valve model through the interface device, acquiring the state information of each soft direct converter valve submodule in the converter valve model through the interface device, and feeding back the state information of each soft direct converter valve submodule to the valve control device.
Further, the high-speed interface board card is used for converting sinusoidal alternating voltage signals in simulation into analog signals and sending the analog signals; the conversion coefficient of the high-speed interface board card meets the condition that the sent analog signal does not exceed the maximum output range of the analog signal, and the D/A conversion precision is not less than 1us.
Further, the coefficient of the high-speed interface board card is k1=k2×u1/(U2);
wherein U1 is the peak value of the sinusoidal alternating voltage signal, U2 is the rated input value of the acquisition and measurement device, and k2 is the transformation ratio of the power amplifier.
Further, the system also comprises a power amplifier arranged between the high-speed interface board card and the acquisition and measurement device, and the power amplifier is used for amplifying the sine alternating-current voltage signal to a rated input value.
Further, the delay Δt2=n/S of the interface device; where S is the transmission rate and N is the data length.
In order to solve the technical problems, the embodiment of the invention also provides a real-time testing method for the link delay of the flexible direct current transmission control system, which comprises the following steps:
receiving a sinusoidal alternating voltage signal sent by a real-time simulator through a high-speed interface board card, and converting the sinusoidal alternating voltage signal into a trigger pulse signal after voltage conversion, hardware filtering, digital-to-analog conversion and modulation processing;
sending the trigger pulse signal into a real-time simulator, and feeding back the state information of each soft direct current converter valve submodule in the real-time simulator to the control link;
and triggering a submodule unit in a converter valve model to output corresponding trigger alternating voltage after receiving the pulse trigger signal, calculating the delay of the synchronous alternating voltage signal and the trigger alternating voltage signal, and removing the delay in a high-speed interface board card and an interface device to obtain the delay of the control link.
Further, the real-time simulator is also used for building a converter valve model and an alternating current voltage source model according to engineering parameters; the voltage source port of the alternating current voltage source model is connected with the high-speed interface board card; the submodule unit in the converter valve model is a half-bridge submodule or a full-bridge submodule.
Further, the sinusoidal alternating voltage signal is converted into a trigger pulse signal after voltage conversion, hardware filtering, digital-to-analog conversion and modulation processing, specifically,
the sinusoidal alternating current synchronous signals are subjected to voltage conversion, hardware filtering and digital-to-analog conversion through the acquisition and measurement device so as to obtain alternating current synchronous signals, and the alternating current synchronous signals are sent to the valve group control device;
the valve group control device receives the alternating current synchronous signal and converts the alternating current synchronous signal acquired in the interruption period into a level modulation signal to be input into the valve control device;
the valve control device converts the received level modulation signal into a corresponding trigger pulse signal and sends the trigger pulse signal into a pulse distribution unit;
the pulse distribution device sends the trigger pulse signal to the converter valve model through the interface device, and meanwhile, the pulse distribution unit obtains the state information of each soft direct converter valve submodule in the converter valve model through the interface device and feeds the state information of each soft direct converter valve submodule back to the valve control device.
Compared with the prior art, the embodiment of the invention provides a real-time testing system for link delay of a flexible direct-current transmission control system, which receives a sinusoidal alternating-current voltage signal sent by a real-time simulator through a high-speed interface board card through a control link, and converts the sinusoidal alternating-current voltage signal into a trigger pulse signal after voltage conversion, hardware filtering, digital-to-analog conversion and modulation processing; the interface device sends the trigger pulse signal to a real-time simulator, and feeds back the state information of each soft direct current converter valve submodule in the real-time simulator to the control link; and triggering a submodule unit in a converter valve model to output corresponding trigger alternating voltage after receiving the pulse trigger signal by the real-time simulator, calculating the delay of the synchronous alternating voltage signal and the trigger alternating voltage signal, and removing the delay in the high-speed interface board card and the interface device to obtain the delay of the control link. The invention can solve the problem that the zero crossing point cannot be accurately acquired when the zero crossing point of the input signal of the direct current control protection system is acquired, thereby causing measurement errors. Or the preset voltage threshold is required to be introduced when the zero crossing point is judged, the error is overlarge due to the overlarge threshold, and the measurement is difficult due to the fact that the zero crossing point is difficult to capture due to the overlarge threshold.
Drawings
Fig. 1 is a block diagram of a real-time testing system for link delay of a flexible direct current transmission control system provided by the invention;
fig. 2 is an application structure diagram of a real-time testing system for link delay of a flexible direct current transmission control system;
FIG. 3 is a timing diagram of the synchronous AC voltage signal and the trigger AC voltage signal of FIG. 2;
fig. 4 is a link delay test chart of a specific flexible direct current transmission control system without detecting zero crossing points;
fig. 5 is a flowchart of a real-time testing method for link delay of a flexible direct current transmission control system provided by the invention;
fig. 6 is a block diagram of a power terminal according to the present invention.
Detailed Description
The following description of the embodiments of the present invention will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present invention, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the present invention without making any inventive effort, are intended to fall within the scope of the present invention.
It should be noted that, the step numbers herein are only for convenience of explanation of the specific embodiments, and are not used as limiting the order of execution of the steps. The method provided in this embodiment may be executed by a relevant server, and the following description will take the server as an execution body as an example.
As shown in fig. 1 to 4, an embodiment of the present invention provides a real-time testing system for link delay of a flexible dc transmission control system, where the system includes a control link 10, an interface device 20, and a real-time simulator 30, which are sequentially connected.
And the control link 10 is used for receiving the sinusoidal alternating voltage signal sent by the real-time simulator through the high-speed interface board card, and converting the sinusoidal alternating voltage signal into a trigger pulse signal after voltage conversion, hardware filtering, digital-to-analog conversion and modulation processing.
Further, the control link 10 includes:
the acquisition and measurement device 11 is used for performing voltage conversion, hardware filtering and digital-to-analog conversion on the sinusoidal alternating current synchronous signal to obtain an alternating current synchronous signal. It can be understood that the collection and measurement device is internally provided with a corresponding voltage conversion circuit or module, a hardware filter circuit or module and an analog-to-digital conversion circuit or module, and the voltage conversion circuit or module, the hardware filter circuit or module and the analog-to-digital conversion circuit or module can be screened according to actual requirements.
The valve group control device 12 is configured to receive the ac synchronization signal and convert the ac synchronization signal collected during the interruption period into a level modulation signal.
And the valve control device 13 is used for converting the received level modulation signal into a corresponding trigger pulse signal.
And the pulse distribution device 14 is used for sending the trigger pulse signal to the converter valve model through the interface device, and simultaneously, the pulse distribution unit acquires the state information of each soft direct converter valve submodule in the converter valve model through the interface device and feeds back the state information of each soft direct converter valve submodule to the valve control device.
Specifically, the acquisition and measurement device receives a sinusoidal alternating voltage signal sent by the real-time simulator through a high-speed interface board card, performs voltage conversion, hardware filtering and analog-to-digital conversion on the sinusoidal alternating voltage signal to obtain an alternating current synchronous signal, and transmits the alternating current synchronous signal to a valve group control device; when the valve group control device receives the alternating current synchronous signal, after executing a complete control program, converting the alternating current synchronous signal acquired in the interruption period into a level modulation signal, and inputting the level modulation signal into the valve control device; the valve control device receives the level modulation signal output by the valve group control device, generates a corresponding trigger pulse signal through a control program and sends the trigger pulse signal to the pulse distribution device; and a submodule input instruction output by the pulse distribution device is sent to the real-time simulator through the interface device.
The interface device 20 is used for sending the trigger pulse signal to the real-time simulator and feeding back the state information of each soft direct current converter valve submodule in the real-time simulator to the control link.
Specifically, the interface device converts the data format of the input command signals of the soft direct current converter valve submodule units in the converter valve model into the data format which can be identified by the real-time simulator, and simultaneously feeds back the collected submodule unit information to the valve control device.
The real-time simulator 30 is configured to trigger the submodule unit in the converter valve model to output a corresponding trigger ac voltage after receiving the pulse trigger signal, calculate the delay between the synchronous ac voltage signal and the trigger ac voltage signal, and remove the delay in the high-speed interface board card and the interface device to obtain the delay of the control link.
Further, the real-time simulator is further used for constructing a converter valve model and an alternating current voltage source model according to engineering parameters, setting direct current voltage of a soft direct current converter valve submodule in the converter valve model as a rated value given by engineering design correspondingly, and setting voltage source amplitude and frequency of voltage source port voltage in the alternating current voltage source model as engineering rated parameters; the voltage source port of the alternating current voltage source model is connected with the high-speed interface board card; the submodule unit in the converter valve model is a half-bridge submodule or a full-bridge submodule, and the real-time simulation step length setting value of the real-time simulator is set within 2 us.
Specifically, the high-speed interface board card is used for converting sinusoidal alternating voltage signals in simulation into analog signals and sending the analog signals; the conversion coefficient of the high-speed interface board card meets the condition that the sent analog signal does not exceed the maximum output range of the analog signal, and the D/A conversion precision is not less than 1us.
Further, the system also comprises a power amplifier arranged between the high-speed interface board card and the acquisition and measurement device, and the power amplifier is used for amplifying the sine alternating-current voltage signal to a rated input value.
Specifically, in order to make the output power grid of the power amplifier meet the requirement of collecting the input signal value of the measuring device, the coefficient of the high-speed interface board card needs to be set as k1=k2×u1/(U2); wherein U1 is the peak value of the sinusoidal alternating voltage signal, U2 is the rated input value of the acquisition and measurement device, and k2 is the transformation ratio of the power amplifier.
It can be understood that after receiving the submodule input instruction output by the pulse distribution device, the real-time simulator triggers the submodule unit in the converter valve model, the converter valve outputs a corresponding alternating voltage, the real-time simulator calculates the delay delta t1 of the synchronous alternating voltage signal and the alternating voltage signal output by the converter valve unit, and the time delta t2 of the interface device for executing data format conversion and the data conversion delay delta t3 of the high-speed board card are subtracted, so that the actual control link delay delta t is obtained. Delay Δt2=n/S of the interface device; where S is the transmission rate and N is the data length. The method and the device do not need to detect the zero crossing point, can accurately acquire the link delay, and solve the problem that in the prior art, the zero crossing point cannot be accurately acquired when the zero crossing point of the input signal of the direct current control protection system is acquired, so that measurement errors are caused. Or the preset voltage threshold is required to be introduced when the zero crossing point is judged, the error is overlarge due to the overlarge threshold, and the measurement is difficult due to the fact that the zero crossing point is difficult to capture due to the overlarge threshold.
The embodiment of the invention provides a real-time testing method for link delay of a flexible direct-current transmission control system, which is characterized in that a sinusoidal alternating-current voltage signal sent by a real-time simulator through a high-speed interface board card is received through a control link, and the sinusoidal alternating-current voltage signal is converted into a trigger pulse signal after voltage conversion, hardware filtering, digital-to-analog conversion and modulation processing; the interface device sends the trigger pulse signal to a real-time simulator, and feeds back the state information of each soft direct current converter valve submodule in the real-time simulator to the control link; and triggering a submodule unit in a converter valve model to output corresponding trigger alternating voltage after receiving the pulse trigger signal by the real-time simulator, calculating the delay of the synchronous alternating voltage signal and the trigger alternating voltage signal, and removing the delay in the high-speed interface board card and the interface device to obtain the delay of the control link. The invention can solve the problem that the zero crossing point cannot be accurately acquired when the zero crossing point of the input signal of the direct current control protection system is acquired, thereby causing measurement errors. Or the preset voltage threshold is required to be introduced when the zero crossing point is judged, the error is overlarge due to the overlarge threshold, and the measurement is difficult due to the fact that the zero crossing point is difficult to capture due to the overlarge threshold.
As shown in fig. 5, the method for testing the link delay of the flexible direct current transmission control system in real time provided by the invention comprises the following steps:
step S21, a sinusoidal alternating voltage signal sent by the real-time simulator through the high-speed interface board card is received through the acquisition and measurement device, and the sinusoidal alternating voltage signal is converted into a trigger pulse signal after voltage conversion, hardware filtering, digital-to-analog conversion and modulation processing. The real-time simulator is also used for building a converter valve model and an alternating current voltage source model in the real-time simulator according to engineering parameters; the voltage source port of the alternating current voltage source model is connected with the high-speed interface board card; the submodule unit in the converter valve model is a half-bridge submodule or a full-bridge submodule. It can be understood that the collection and measurement device is internally provided with a corresponding voltage conversion circuit or module, a hardware filter circuit or module and an analog-to-digital conversion circuit or module, and the voltage conversion circuit or module, the hardware filter circuit or module and the analog-to-digital conversion circuit or module can be screened according to actual requirements.
Specifically, the sinusoidal alternating current synchronous signal is subjected to voltage conversion, hardware filtering and digital-to-analog conversion by the acquisition and measurement device so as to obtain an alternating current synchronous signal, and the alternating current synchronous signal is sent to the valve group control device;
the valve group control device receives the alternating current synchronous signal and converts the alternating current synchronous signal acquired in the interruption period into a level modulation signal to be input into the valve control device;
the valve control device converts the received level modulation signal into a corresponding trigger pulse signal and sends the trigger pulse signal into a pulse distribution unit;
the pulse distribution device sends the trigger pulse signal to the converter valve model through the interface device, and meanwhile, the pulse distribution unit obtains the state information of each soft direct converter valve submodule in the converter valve model through the interface device and feeds the state information of each soft direct converter valve submodule back to the valve control device.
And S22, sending the trigger pulse signal to a real-time simulator, and feeding back the state information of each soft direct current converter valve submodule in the real-time simulator to the control link.
Step S23, after receiving the pulse trigger signal, triggering a submodule unit in a converter valve model to output a corresponding trigger alternating voltage, calculating the time delay of the synchronous alternating voltage signal and the trigger alternating voltage signal, and removing the time delay in a high-speed interface board card and an interface device to obtain the time delay of the control link.
When the method is implemented, a flexible direct current converter valve model and an alternating current voltage source model are built in a real-time simulator according to engineering parameters; setting the direct-current voltage of a soft direct-current converter valve submodule as a rated value given by engineering design, setting the amplitude and the frequency of a voltage source of an alternating-current voltage source model as engineering rated parameters, and sending out the voltage of a voltage source voltage port as a sinusoidal alternating-current voltage signal through a high-speed interface board card;
setting the real-time simulation step length setting value within 2 us;
converting the sinusoidal alternating voltage signal in simulation into an analog signal by the high-speed interface board card and sending the analog signal out, wherein the conversion coefficient of the high-speed interface board card ensures that the sent analog signal does not exceed the maximum output range of the analog signal, and the conversion D/A conversion precision of the high-speed interface board card is not less than 1us;
the sinusoidal alternating voltage signal sent by the high-speed interface board card is sent to the acquisition and measurement device through the power amplifier; the power amplifier is used for amplifying a sinusoidal alternating-current voltage signal to a rated input value of the acquisition and measurement device;
in order to enable the power amplifier output power grid to meet the requirement of the input signal value of the analog quantity acquisition device, the coefficient of the high-speed interface board card can be set to k1=k2×u1/(U2), U1 is a virtual sinusoidal alternating-current voltage signal peak value, U2 is a rated input value of the analog quantity acquisition device, and k2 is the transformation ratio of the power amplifier.
The acquisition and measurement device performs voltage conversion, hardware filtering and digital-to-analog conversion on the sinusoidal alternating current synchronous signal to obtain an alternating current synchronous signal, and sends the alternating current synchronous signal to the valve group control device;
the valve group control device is provided with an unlocking position, receives an alternating current synchronous signal, and converts the alternating current synchronous signal acquired in the interrupt period into a level modulation signal to be input into the valve control device after executing a complete control program;
the valve control device receives the level modulation signal output by the valve group control device, generates a corresponding trigger pulse signal through a control program, and sends the trigger pulse signal to the pulse distribution device;
the submodule input instruction output by the pulse distribution device is sent to the real-time simulator through the interface device, and the interface device is used for converting the data format of the soft direct current converter valve submodule input instruction signal into a data format which can be recognized by the real-time simulator, and collecting submodule information and feeding back to the valve control device;
the real-time simulator triggers a submodule unit in the converter valve model after receiving a submodule input instruction output by the pulse distribution unit, and the converter valve outputs corresponding alternating voltage;
and calculating the delay delta t1 of the synchronous alternating-current voltage signal and the alternating-current voltage signal output by the converter valve unit in the real-time simulator, and subtracting the time delta t2 of the interface device for executing data format conversion and the high-speed board card data conversion delay delta t3 to obtain the actual control link delay delta t. Wherein, the time Δt2=n/S for the interface device to perform data format conversion, S is the transmission rate, and N is the data length.
Compared with the prior art, the embodiment of the invention provides a real-time testing method for the link delay of a flexible direct-current transmission control system, which is used for receiving a sinusoidal alternating-current voltage signal sent by a real-time simulator through a high-speed interface board card through a control link, and converting the sinusoidal alternating-current voltage signal into a trigger pulse signal after voltage conversion, hardware filtering, digital-to-analog conversion and modulation processing; the interface device sends the trigger pulse signal to a real-time simulator, and feeds back the state information of each soft direct current converter valve submodule in the real-time simulator to the control link; and triggering a submodule unit in a converter valve model to output corresponding trigger alternating voltage after receiving the pulse trigger signal by the real-time simulator, calculating the delay of the synchronous alternating voltage signal and the trigger alternating voltage signal, and removing the delay in the high-speed interface board card and the interface device to obtain the delay of the control link. The invention can solve the problem that the zero crossing point cannot be accurately acquired when the zero crossing point of the input signal of the direct current control protection system is acquired, thereby causing measurement errors. Or the preset voltage threshold is required to be introduced when the zero crossing point is judged, the error is overlarge due to the overlarge threshold, and the measurement is difficult due to the fact that the zero crossing point is difficult to capture due to the overlarge threshold.
It should be understood that, although the steps in the above-described flowcharts are shown in order as indicated by the arrows, these steps are not necessarily performed in order as indicated by the arrows. The steps are not strictly limited to the order of execution unless explicitly recited herein, and the steps may be executed in other orders. Moreover, at least some of the steps in the flowcharts described above may include a plurality of sub-steps or stages that are not necessarily performed at the same time, but may be performed at different times, and the order of execution of the sub-steps or stages is not necessarily sequential, but may be performed alternately or alternately with at least a part of the sub-steps or stages of other steps or other steps.
The embodiment of the invention also provides a computer readable storage medium, which comprises a stored computer program; the computer program controls the equipment where the computer readable storage medium is located to execute the real-time testing method for the link delay of the flexible direct current transmission control system according to any one of the embodiments.
An embodiment of the present invention further provides an electric power terminal, referring to fig. 6, which is a block diagram of a preferred embodiment of the electric power terminal provided by the present invention, where the electric power terminal includes a processor 10, a memory 20, and a computer program stored in the memory 20 and configured to be executed by the processor 10, and the processor 10 implements the method for testing link delay of the flexible dc transmission control system according to any one of the foregoing embodiments when executing the computer program.
Preferably, the computer program may be partitioned into one or more modules/units (e.g., computer program 1, computer program 2, & gtthe & lt- & gt, & lt- & gt) that are stored in the memory 20 and executed by the processor 10 to complete the present invention. The one or more modules/units may be a series of computer program instruction segments capable of performing specific functions for describing the execution of the computer program in the power terminal.
The processor 10 may be a central processing unit (Central Processing Unit, CPU), it may be a microprocessor, it may be other general purpose processor, it may be a digital signal processor (Digital Signal Processor, DSP), an application specific integrated circuit (Application Specific Integrated Circuit, ASIC), an off-the-shelf programmable gate array (Field-Programmable Gate Array, FPGA) or other programmable logic device, discrete gate or transistor logic device, discrete hardware components, etc., or it may be any conventional processor, the processor 10 being a control center of the power terminal, it being possible for various interfaces and lines to connect various parts of the power terminal.
The memory 20 mainly includes a program storage area, which may store an operating system, application programs required for at least one function, and the like, and a data storage area, which may store related data and the like. In addition, the memory 20 may be a high-speed random access memory, a nonvolatile memory such as a plug-in hard disk, a Smart Media Card (SMC), a Secure Digital (SD) Card, a Flash Card (Flash Card), etc., or the memory 20 may be other volatile solid-state memory devices.
It should be noted that the above power terminal may include, but is not limited to, a processor, a memory, and those skilled in the art will appreciate that the block diagram of fig. 6 is merely an example of a power terminal, and does not constitute a limitation of the power terminal, and may include more or less components than those illustrated, or may combine some components, or different components.
The foregoing is merely a preferred embodiment of the present invention, and it should be noted that modifications and variations could be made by those skilled in the art without departing from the technical principles of the present invention, and such modifications and variations should also be regarded as being within the scope of the invention.
Claims (6)
1. A real-time testing system for link delay of a flexible direct current transmission control system, the system comprising:
the control link includes:
the acquisition and measurement device is used for performing voltage conversion, hardware filtering and digital-to-analog conversion on the sinusoidal alternating voltage signal sent by the high-speed interface board card so as to obtain an alternating current synchronous signal;
the valve group control device is used for receiving the alternating current synchronous signals and converting the alternating current synchronous signals acquired in the interrupt period into level modulation signals;
the valve control device is used for converting the received level modulation signal into a corresponding trigger pulse signal;
the pulse distribution device is used for sending the trigger pulse signal into the converter valve model through the interface device, acquiring the state information of each soft direct converter valve submodule in the converter valve model through the interface device, and feeding back the state information of each soft direct converter valve submodule to the valve control device;
the control link is used for receiving the sinusoidal alternating voltage signal sent by the real-time simulator through the high-speed interface board card, and converting the sinusoidal alternating voltage signal into a trigger pulse signal after voltage conversion, hardware filtering, digital-to-analog conversion and modulation processing; the high-speed interface board card is used for converting a sinusoidal alternating voltage signal in the real-time simulator into an analog signal and sending the analog signal; the coefficient of the high-speed interface board card is k1=k2×u1/(U2); wherein U1 is the peak value of the sinusoidal alternating voltage signal, U2 is the rated input value of the acquisition and measurement device, and k2 is the transformation ratio of the power amplifier;
the interface device is used for sending the trigger pulse signal into the real-time simulator and feeding back the state information of each soft direct current converter valve submodule in the real-time simulator to the control link;
the real-time simulator is used for triggering a submodule unit in a converter valve model to output a corresponding trigger alternating voltage signal after receiving the trigger pulse signal, outputting a corresponding alternating voltage by the converter valve, calculating the delay of the sinusoidal alternating voltage signal and the trigger alternating voltage signal, and removing the delay of an interface device for executing data format conversion and the delay of high-speed board card data conversion so as to obtain the delay of the control link; delay of interface device t2=n/S; where S is the transmission rate and N is the data length.
2. The real-time testing system of the link delay of the flexible direct current transmission control system according to claim 1, wherein the real-time simulator is further used for constructing a converter valve model and an alternating current voltage source model according to engineering parameters; the voltage source port of the alternating current voltage source model is connected with the high-speed interface board card; the submodule unit in the converter valve model is a half-bridge submodule or a full-bridge submodule.
3. The real-time testing system of link delay of flexible direct current transmission control system according to claim 1, wherein the conversion coefficient of the high-speed interface board card meets the requirement that the sent analog signal does not exceed the maximum output range of the analog signal, and the D/A conversion precision is not less than 1us.
4. The system for real-time testing of link delay of a flexible direct current transmission control system of claim 1, further comprising a power amplifier disposed between the high speed interface board and the acquisition and measurement device, the power amplifier configured to amplify the sinusoidal alternating current voltage signal to a nominal input value.
5. A method for testing link delay of a flexible direct current transmission control system in real time, the method comprising:
receiving a sinusoidal alternating voltage signal sent by a real-time simulator through a high-speed interface board card through a control link, and converting the sinusoidal alternating voltage signal into a trigger pulse signal after voltage conversion, hardware filtering, digital-to-analog conversion and modulation processing; the high-speed interface board card is used for converting a sinusoidal alternating voltage signal in the real-time simulator into an analog signal and sending the analog signal;
sending the trigger pulse signal into a real-time simulator, and feeding back the state information of each soft direct current converter valve submodule in the real-time simulator to the control link;
triggering a submodule unit in a converter valve model to output a corresponding trigger alternating voltage signal after receiving the trigger pulse signal, calculating the delay of the sinusoidal alternating voltage signal and the trigger alternating voltage signal, and removing the delay in a high-speed interface board card and an interface device to obtain the delay of the control link;
the step of converting the sinusoidal alternating voltage signal into a trigger pulse signal after voltage conversion, hardware filtering, digital-to-analog conversion and modulation processing comprises the following steps:
the sinusoidal alternating voltage signal is subjected to voltage conversion, hardware filtering and digital-to-analog conversion by the acquisition and measurement device so as to obtain an alternating current synchronous signal, and the alternating current synchronous signal is sent to the valve group control device;
the valve group control device receives the alternating current synchronous signal and converts the alternating current synchronous signal acquired in the interruption period into a level modulation signal to be input into the valve control device;
the valve control device converts the received level modulation signal into a corresponding trigger pulse signal and sends the trigger pulse signal into a pulse distribution device;
the pulse distribution device sends the trigger pulse signal to the converter valve model through the interface device, and meanwhile, the pulse distribution device obtains the state information of each soft direct converter valve submodule in the converter valve model through the interface device and feeds the state information of each soft direct converter valve submodule back to the valve control device.
6. The method for testing the link delay of the flexible direct current transmission control system in real time according to claim 5, further comprising the step of constructing a converter valve model and an alternating current voltage source model in the real-time simulator according to engineering parameters; the voltage source port of the alternating current voltage source model is connected with the high-speed interface board card; the submodule unit in the converter valve model is a half-bridge submodule or a full-bridge submodule.
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