CN113433381A - Real-time testing system and method for link delay of flexible direct-current power transmission control system - Google Patents
Real-time testing system and method for link delay of flexible direct-current power transmission control system Download PDFInfo
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- CN113433381A CN113433381A CN202110457986.5A CN202110457986A CN113433381A CN 113433381 A CN113433381 A CN 113433381A CN 202110457986 A CN202110457986 A CN 202110457986A CN 113433381 A CN113433381 A CN 113433381A
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Abstract
The invention discloses a real-time testing system and a method for link delay of a flexible direct-current transmission control system, wherein the real-time testing system comprises the following steps: receiving a sinusoidal alternating-current voltage signal sent by a real-time simulator through a high-speed interface board card through an acquisition and measurement device, 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; sending a trigger pulse signal to a real-time simulator through an interface device, and feeding back state information of each flexible-straight converter valve submodule in the real-time simulator to a control link; and after receiving the pulse trigger signal, triggering the sub-module unit 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 the high-speed interface board card and the interface device to obtain the time delay of the control link. The invention can avoid the problem that the measurement is difficult because the zero crossing point can not be accurately obtained when the input signal of the direct current control protection system is obtained or the preset voltage threshold value needs 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 system and a method for testing link delay of a flexible direct current transmission control system in real time.
Background
Flexible dc power transmission is a new type of power 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, being free of phase change failure, being easy to form a multi-terminal direct-current system and the like, shows huge technical advantages in application occasions such as wind power plant grid connection, asynchronous networking, urban power supply, improvement of traditional direct-current operation characteristics and the like, is an important technical basis for building a direct-current power grid and developing an energy internet, and is also one of important development directions in the field of power transmission.
The flexible direct current control system link delay is used as one of key parameters influencing the dynamic performance of flexible direct current transmission and harmonic resonance, so that the accurate and effective test of the flexible direct current control system link delay has important significance for control parameter design and optimization, system harmonic resonance risk assessment and response.
In the prior art, when the zero crossing point of an input signal of a direct current control protection system is obtained, a measurement error is caused because the zero crossing point cannot be accurately obtained. Or due to the fact that a preset voltage threshold needs to be introduced when the zero crossing point is judged, an overlarge threshold causes an overlarge error, and an overlarge threshold causes difficulty in capturing the zero crossing point, so that measurement is difficult.
Disclosure of Invention
The technical problem to be solved by the embodiments of the present invention is to provide a real-time testing system and method for link delay of a flexible direct current power transmission control system, which can avoid the problem that when a zero crossing point of an input signal of a direct current control protection system is obtained, a zero crossing point cannot be accurately obtained, so that a measurement error is caused, or when a preset voltage threshold is required to be introduced when the zero crossing point is judged, an error is too large due to an excessively large threshold, and a zero crossing point is difficult to capture due to an excessively small threshold, so that measurement is difficult.
In order to solve the above technical problem, an embodiment of the present invention provides a real-time testing system for link delay of a flexible dc power transmission control system, where the system includes:
the control link is used for receiving a sinusoidal alternating-current voltage signal sent by the real-time simulator through the high-speed interface board card, 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 is used for sending the trigger pulse signal to the real-time simulator and feeding back the state information of each flexible-straight converter valve submodule in the real-time simulator to the control link;
and the real-time simulator is used for triggering a sub-module unit in a converter valve model to output corresponding trigger alternating voltage after receiving the pulse trigger signal, calculating the time delay of the synchronous alternating voltage signal and the trigger alternating voltage signal, and removing the time delay in the high-speed interface board card and the interface device to obtain the time delay of the control link.
Furthermore, 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; and the sub-module unit in the converter valve model is a half-bridge sub-module or a full-bridge sub-module.
Further, 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 current synchronous signal to obtain an alternating current synchronous signal;
the valve group control device is used for receiving the alternating current synchronous signal and converting the alternating current synchronous signal collected in the interrupt period into a level modulation signal;
the valve control device is used for converting the received level modulation signal into a corresponding trigger pulse signal;
and the pulse distribution device is used for sending the trigger pulse signal into the converter valve model through the interface device, and meanwhile, the pulse distribution unit acquires the state information of each flexible-straight converter valve submodule in the converter valve model through the interface device and feeds the state information of each flexible-straight converter valve submodule back to the valve control device.
Furthermore, the high-speed interface board card is used for converting a sinusoidal alternating voltage signal in simulation into an analog signal and sending the analog signal out; 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 high-speed interface board card, and the D/A conversion precision is not less than 1 us.
Further, the coefficient of the high-speed interface board card is k1 ═ k2 ═ U1/(U2);
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.
Furthermore, the system also comprises a power amplifier arranged between the high-speed interface board card and the acquisition and measurement device, wherein the power amplifier is used for amplifying the sinusoidal alternating-current voltage signal to a rated input value.
Further, the delay Δ t2 of the interface device is N/S; wherein S is a transmission rate and N is a data length.
In order to solve the above technical problem, an embodiment of the present invention further provides a real-time testing method for link delay of a flexible dc power transmission control system, where the method includes:
receiving a sinusoidal alternating-current voltage signal sent by a real-time simulator through a high-speed interface board card, 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;
sending the trigger pulse signal to a real-time simulator, and feeding back the state information of each flexible direct converter valve submodule in the real-time simulator to the control link;
and after receiving the pulse trigger signal, triggering a sub-module unit in a converter valve model of the converter valve to output 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 the high-speed interface board card and the interface device to obtain the time delay of the control link.
Furthermore, 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; and the sub-module unit in the converter valve model is a half-bridge sub-module or a full-bridge sub-module.
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,
carrying out voltage conversion, hardware filtering and digital-to-analog conversion on the sinusoidal alternating current synchronous signal through an acquisition and measurement device to obtain an alternating current synchronous signal, and sending the alternating current synchronous signal to a valve group control device;
the valve group control device receives the alternating current synchronous signal, converts the alternating current synchronous signal collected in the interrupt period into a level modulation signal and inputs the level modulation signal into a 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 signals to the converter valve model through the interface device, and meanwhile, the pulse distribution unit obtains the state information of each flexible-straight converter valve submodule in the converter valve model through the interface device and feeds the state information of each flexible-straight 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 the link delay of a flexible direct-current power 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 flexible-straight converter valve submodule in the real-time simulator to the control link; and after receiving the pulse trigger signal, the real-time simulator triggers a sub-module unit in a converter valve model of the converter valve to output corresponding trigger alternating voltage, calculates the time delay of the synchronous alternating voltage signal and the trigger alternating voltage signal, and removes the time delay in the high-speed interface board card and the interface device to obtain the time delay of the control link. The invention can solve the problem of measurement error caused by the fact 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. Or due to the fact that a preset voltage threshold needs to be introduced when the zero crossing point is judged, an overlarge threshold causes an overlarge error, and an overlarge threshold causes difficulty in capturing the zero crossing point, so that measurement is difficult.
Drawings
Fig. 1 is a block diagram of a real-time testing system for link delay of a flexible dc power transmission control system according to the present invention;
fig. 2 is an application structure diagram of a real-time testing system for link delay of a flexible dc power transmission control system according to the present invention;
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 power transmission control system provided by the invention without detecting a zero crossing point;
fig. 5 is a flowchart of a real-time testing method for link delay of a flexible direct-current power transmission control system according to the present invention;
fig. 6 is a block diagram of a power terminal according to the present invention.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious 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 any inventive step, are within the scope of the present invention.
It should be noted that, the step numbers in the text are only for convenience of explanation of the specific embodiments, and do not serve to limit the execution sequence of the steps. The method provided by the embodiment can be executed by the relevant server, and the server is taken as an example for explanation below.
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 power transmission control system, where the system includes a control link 10, an interface device 20, and a real-time simulator 30, which are connected in sequence.
And the control link 10 is used for receiving the sinusoidal alternating-current voltage signal sent by the real-time simulator through the high-speed interface board card, 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.
Further, the control link 10 includes:
and 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 a voltage conversion circuit or module, a hardware filter circuit or module, and an analog-to-digital conversion circuit or module are provided in the acquisition and measurement device, and the voltage conversion circuit or module, the hardware filter circuit or module, and the analog-to-digital conversion circuit or module may be screened according to actual requirements.
And the valve group control device 12 is used for receiving the alternating current synchronous signal and converting the alternating current synchronous signal acquired in the interrupt 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 into the converter valve model through an interface device, and meanwhile, the pulse distribution unit acquires the state information of each flexible-straight converter valve submodule in the converter valve model through the interface device and feeds the state information of each flexible-straight converter valve submodule back to the valve control device.
Specifically, the acquisition and measurement device receives a sinusoidal alternating-current 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-current 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 a complete control program is executed, the alternating current synchronous signal collected in the interrupt period is converted into a level modulation signal and input 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 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 20 is configured to send the trigger pulse signal to the real-time simulator, and feed back status information of each flexible-straight converter valve sub-module in the real-time simulator to the control link.
Specifically, the interface device converts a data format of an input instruction signal of a flexible-straight converter valve sub-module unit in the converter valve model into a data format which can be recognized by a real-time simulator, and feeds back the acquired sub-module unit information to the valve control device.
And the real-time simulator 30 is configured to trigger a sub-module unit in the converter valve model to output a corresponding trigger alternating voltage after receiving the pulse trigger signal, calculate a time delay between the synchronous alternating voltage signal and the trigger alternating voltage signal, and remove the time delay in the high-speed interface board and the interface device to obtain the time delay of the control link.
Furthermore, the real-time simulator is also used for building a converter valve model and an alternating current voltage source model according to engineering parameters, correspondingly setting the direct current voltage of a flexible direct current converter valve submodule in the converter valve model as a rated value given by engineering design, and setting the voltage source amplitude and the frequency of the voltage of a voltage source port 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; and 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 a sinusoidal alternating-current voltage signal in simulation into an analog signal and sending the analog signal; 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 high-speed interface board card, and the D/A conversion precision is not less than 1 us.
Furthermore, the system also comprises a power amplifier arranged between the high-speed interface board card and the acquisition and measurement device, wherein the power amplifier is used for amplifying the sinusoidal alternating-current voltage signal to a rated input value.
Specifically, in order to enable the power amplifier output power grid to meet the requirement of acquiring the input signal value of the measuring device, the coefficient of the high-speed interface board card is set to be k 1-k 2-U1/(U2); 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 the real-time simulator triggers the sub-module unit in the converter valve model after receiving the sub-module input command output by the pulse distribution device, the converter valve outputs the corresponding alternating voltage, the time delay Δ t1 of the synchronous alternating voltage signal and the alternating voltage signal output by the converter valve unit is calculated in the real-time simulator, and the time Δ t2 of the interface device for performing the data format conversion and the high-speed board data conversion time delay Δ t3 are subtracted, so that the actual control link time delay Δ t is obtained. The delay Δ t2 of the interface device is N/S; wherein S is a transmission rate and N is a 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 the zero crossing point cannot be accurately acquired when the input signal of the direct current control protection system is acquired in the prior art, so that the measurement error is caused. Or due to the fact that a preset voltage threshold needs to be introduced when the zero crossing point is judged, an overlarge threshold causes an overlarge error, and an overlarge threshold causes difficulty in capturing the zero crossing point, so that measurement is difficult.
The embodiment of the invention provides a real-time testing method for link delay of a flexible direct-current power transmission control system, which comprises the steps of 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 flexible-straight converter valve submodule in the real-time simulator to the control link; and after receiving the pulse trigger signal, the real-time simulator triggers a sub-module unit in a converter valve model of the converter valve to output corresponding trigger alternating voltage, calculates the time delay of the synchronous alternating voltage signal and the trigger alternating voltage signal, and removes the time delay in the high-speed interface board card and the interface device to obtain the time delay of the control link. The invention can solve the problem of measurement error caused by the fact 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. Or due to the fact that a preset voltage threshold needs to be introduced when the zero crossing point is judged, an overlarge threshold causes an overlarge error, and an overlarge threshold causes difficulty in capturing the zero crossing point, so that measurement is difficult.
As shown in fig. 5, the method for testing the link delay of the flexible dc power transmission control system in real time provided by the present invention includes:
and step S21, receiving the sinusoidal alternating-current voltage signal sent by the real-time simulator through the high-speed interface board card through the acquisition and measurement device, 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 real-time simulator is further 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; and the sub-module unit in the converter valve model is a half-bridge sub-module or a full-bridge sub-module. It can be understood that a voltage conversion circuit or module, a hardware filter circuit or module, and an analog-to-digital conversion circuit or module are provided in the acquisition and measurement device, and the voltage conversion circuit or module, the hardware filter circuit or module, and the analog-to-digital conversion circuit or module may 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 through the acquisition and measurement device 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, converts the alternating current synchronous signal collected in the interrupt period into a level modulation signal and inputs the level modulation signal into a 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 signals to the converter valve model through the interface device, and meanwhile, the pulse distribution unit obtains the state information of each flexible-straight converter valve submodule in the converter valve model through the interface device and feeds the state information of each flexible-straight converter valve submodule back to the valve control device.
And step S22, sending the trigger pulse signal to a real-time simulator, and feeding back the state information of each flexible-straight converter valve submodule in the real-time simulator to the control link.
And step S23, after receiving the pulse trigger signal, triggering a submodule unit in the converter valve model to output 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 the high-speed interface board card and the interface device to obtain the time delay of the control link.
In specific implementation, 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 the submodule of the flexible direct-current converter valve 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 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;
the sine alternating voltage signal in the simulation is converted into an analog signal through the high-speed interface board card and is sent out, 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 high-speed interface board card, and the conversion precision of the high-speed interface board card in D/A conversion is not less than 1 us;
a sinusoidal alternating-current voltage signal sent by the high-speed interface board card is sent to an acquisition and measurement device through a power amplifier; the power amplifier is used for amplifying the sinusoidal alternating voltage signal to a rated input value of the acquisition and measurement device;
in order to enable the output power grid of the power amplifier to meet the requirement of the input signal value of the analog quantity acquisition device, the coefficient of the high-speed interface board card is k1 ═ k2 ═ U1/(U2), U1 is the peak value of the virtual sinusoidal alternating-current voltage signal, U2 is the 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 arranged at an unlocking position, receives the alternating current synchronous signal, executes a complete control program, converts the alternating current synchronous signal acquired in the interrupt period into a level modulation signal and inputs 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;
the input command of the sub-module output by the pulse distribution device is sent to the real-time simulator through an interface device, the interface device is used for converting the data format of the input command signal of the sub-module of the flexible-direct converter valve into a data format which can be recognized by the real-time simulator, and meanwhile, the information of the sub-module is collected and fed back to the valve control device;
after receiving a submodule input instruction output by the pulse distribution unit, the real-time simulator triggers a submodule unit in the converter valve model, and the converter valve outputs corresponding alternating voltage;
and calculating the time delay delta t1 of the synchronous alternating voltage signal and the alternating voltage signal output by the converter valve unit in the real-time simulator, and subtracting the time delta t2 for the interface device to perform data format conversion and the data conversion time delay delta t3 of the high-speed board card to obtain the actual control link time delay delta t. The time Δ t2 for the interface device to perform data format conversion is N/S, 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 power transmission control system, which comprises the steps of receiving a sinusoidal alternating-current voltage signal sent out 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 are carried out on the sinusoidal alternating-current voltage signal; the interface device sends the trigger pulse signal to a real-time simulator, and feeds back the state information of each flexible-straight converter valve submodule in the real-time simulator to the control link; and after receiving the pulse trigger signal, the real-time simulator triggers a sub-module unit in a converter valve model of the converter valve to output corresponding trigger alternating voltage, calculates the time delay of the synchronous alternating voltage signal and the trigger alternating voltage signal, and removes the time delay in the high-speed interface board card and the interface device to obtain the time delay of the control link. The invention can solve the problem of measurement error caused by the fact 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. Or due to the fact that a preset voltage threshold needs to be introduced when the zero crossing point is judged, an overlarge threshold causes an overlarge error, and an overlarge threshold causes difficulty in capturing the zero crossing point, so that measurement is difficult.
It should be understood that, although the steps in the above-described flowcharts are shown in order as indicated by the arrows, the steps are not necessarily performed in order as indicated by the arrows. The steps are not performed in the exact order shown and described, and may be performed in other orders, unless explicitly stated otherwise. Moreover, at least a portion of the steps in the above-described flowcharts may include multiple sub-steps or multiple stages, which are not necessarily performed at the same time, but may be performed at different times, and the order of performing the sub-steps or the stages is not necessarily sequential, but may be performed alternately or alternatingly with other steps or at least a portion of the sub-steps or stages of other steps.
An embodiment of the present invention further provides a computer-readable storage medium, where the computer-readable storage medium includes a stored computer program; when the computer program runs, the device where the computer-readable storage medium is located is controlled to execute the real-time testing method for the link delay of the flexible direct-current power transmission control system according to any one of the embodiments.
An embodiment of the present invention further provides an electric power terminal, which is shown in fig. 6 and is a block diagram of a preferred embodiment of the electric power terminal provided in 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 when the computer program is executed, the processor 10 implements the real-time testing method for the link delay of the flexible direct current power transmission control system according to any one of the embodiments.
Preferably, the computer program can be divided into one or more modules/units (e.g. computer program 1, computer program 2,) which are stored in the memory 20 and executed by the processor 10 to accomplish the present invention. The one or more modules/units may be a series of computer program instruction segments capable of performing specific functions, which are used for describing the execution process of the computer program in the power terminal.
The Processor 10 may be a Central Processing Unit (CPU), other general purpose Processor, a Digital Signal Processor (DSP), an Application Specific Integrated Circuit (ASIC), an off-the-shelf Programmable Gate Array (FPGA) or other Programmable logic device, a discrete Gate or transistor logic device, a discrete hardware component, etc., the general purpose Processor may be a microprocessor, or the Processor 10 may be any conventional Processor, the Processor 10 is a control center of the power terminal, and various interfaces and lines are used to connect various parts of the power terminal.
The memory 20 mainly includes a program storage area that may store an operating system, an application program required for at least one function, and the like, and a data storage area that may store related data and the like. In addition, the memory 20 may be a high speed random access memory, may also be a non-volatile memory, such as a plug-in hard disk, a Smart Media Card (SMC), a Secure Digital (SD) Card, a Flash Card (Flash Card), and the like, or the memory 20 may also be other volatile solid state memory devices.
It should be noted that the above-mentioned power terminal may include, but is not limited to, a processor and a memory, and those skilled in the art will understand that the structural block diagram of fig. 6 is only an example of the power terminal and does not constitute a limitation of the power terminal, and may include more or less components than those shown in the drawings, or may combine some components, or different components.
The above description is only a preferred embodiment of the present invention, and it should be noted that, for those skilled in the art, several modifications and variations can be made without departing from the technical principle of the present invention, and these modifications and variations should also be regarded as the protection scope of the present invention.
Claims (10)
1. A real-time testing system for link delay in a flexible dc power transmission control system, the system comprising:
the control link is used for receiving a sinusoidal alternating-current voltage signal sent by the real-time simulator through the high-speed interface board card, 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 is used for sending the trigger pulse signal to the real-time simulator and feeding back the state information of each flexible-straight converter valve submodule in the real-time simulator to the control link;
and the real-time simulator is used for triggering a sub-module unit in a converter valve model to output corresponding trigger alternating voltage after receiving the pulse trigger signal, calculating the time delay of the synchronous alternating voltage signal and the trigger alternating voltage signal, and removing the time delay in the high-speed interface board card and the interface device to obtain the time delay of the control link.
2. The system for testing the link delay of the flexible direct-current transmission control system according to claim 1, wherein the real-time simulator is further configured to build 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; and the sub-module unit in the converter valve model is a half-bridge sub-module or a full-bridge sub-module.
3. The system for real-time testing of flexible direct current power transmission control system link delay of claim 1, wherein said control link comprises:
the acquisition and measurement device 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;
the valve group control device is used for receiving the alternating current synchronous signal and converting the alternating current synchronous signal collected in the interrupt period into a level modulation signal;
the valve control device is used for converting the received level modulation signal into a corresponding trigger pulse signal;
and the pulse distribution device is used for sending the trigger pulse signal into the converter valve model through the interface device, and meanwhile, the pulse distribution unit acquires the state information of each flexible-straight converter valve submodule in the converter valve model through the interface device and feeds the state information of each flexible-straight converter valve submodule back to the valve control device.
4. The system for testing the link delay of the flexible direct-current power transmission control system according to claim 1, wherein the high-speed interface board card is configured to convert a sinusoidal alternating-current voltage signal in simulation into an analog signal and send the analog signal; 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 high-speed interface board card, and the D/A conversion precision is not less than 1 us.
5. The system of claim 4, wherein the high speed interface board has a k 1-k 2-U1/(U2);
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.
6. The 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 ac voltage signal to a nominal input value.
7. The system for real-time testing of the link delay of a flexible direct current power transmission control system according to claim 1, wherein the delay Δ t2 of the interface means is N/S; wherein S is a transmission rate and N is a data length.
8. A real-time testing method for link delay of a flexible direct-current power transmission control system comprises the following steps:
receiving a sinusoidal alternating-current voltage signal sent by a real-time simulator through a high-speed interface board card, 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;
sending the trigger pulse signal to a real-time simulator, and feeding back the state information of each flexible direct converter valve submodule in the real-time simulator to the control link;
and after receiving the pulse trigger signal, triggering a sub-module unit in a converter valve model of the converter valve to output 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 the high-speed interface board card and the interface device to obtain the time delay of the control link.
9. The method for testing the link delay of the flexible direct-current transmission control system according to claim 8, further comprising 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; and the sub-module unit in the converter valve model is a half-bridge sub-module or a full-bridge sub-module.
10. The method according to claim 8, characterized in that said sinusoidal AC voltage signal is converted into a trigger pulse signal after voltage conversion, hardware filtering, digital-to-analog conversion and modulation, and in particular,
carrying out voltage conversion, hardware filtering and digital-to-analog conversion on the sinusoidal alternating current synchronous signal through an acquisition and measurement device to obtain an alternating current synchronous signal, and sending the alternating current synchronous signal to a valve group control device;
the valve group control device receives the alternating current synchronous signal, converts the alternating current synchronous signal collected in the interrupt period into a level modulation signal and inputs the level modulation signal into a 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 signals to the converter valve model through the interface device, and meanwhile, the pulse distribution unit obtains the state information of each flexible-straight converter valve submodule in the converter valve model through the interface device and feeds the state information of each flexible-straight converter valve submodule back to the valve control device.
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