CN118011856A - Relay protection test system and method capable of adjusting fan converter control strategy - Google Patents
Relay protection test system and method capable of adjusting fan converter control strategy Download PDFInfo
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Abstract
The invention discloses a relay protection test system and a relay protection test method capable of adjusting a control strategy of a fan converter, and belongs to the technical field of relay protection. Aiming at the problem that the traditional physical dynamic simulation system is difficult to adjust the fault characteristics of the wind power delivery system, the invention provides a relay protection test system capable of adjusting the control strategy of a fan converter. The system of the invention comprises: the system comprises a real-time simulation upper computer and a real-time simulation target machine. The system can adjust the control strategy of the fan converter according to the requirements of test projects, thereby changing the fault characteristics of the wind power transmission system and greatly improving the test capability and the test efficiency of the physical dynamic simulation system on the relay protection device of the wind power transmission system.
Description
Technical Field
The invention relates to the technical field of relay protection, in particular to a relay protection test system and method capable of adjusting a fan converter control strategy.
Background
The novel power system is high in proportion of new energy and high in power electronization, so that the fault response process is greatly influenced by a control strategy. Constrained by the power grid fault ride-through requirement, the clusters in the field have transient operation control mode difference rules under different fault scenes, and have unique transient characteristic differences during faults according to different unit operation parameters aiming at a specific transient control mode.
The simulation element selected by the physical simulation technology of the electric power system has the same physical characteristics as the prototype system, the parameters (per unit value) of the corresponding elements are equal, and a physical model of the electric power system is built according to a similar theory. The physical simulation platform of the electric power system consists of a simulation synchronous generator, a simulation transformer, a simulation bus, a simulation power transmission line, a simulation load and a connection line, wherein the simulation elements are provided with uniform hardware interfaces, and an experimenter can connect various physical simulation elements according to simulation requirements so as to simulate different operation scenes of the electric power system.
The method has the remarkable advantages that the method can intuitively reflect the change process of the phenomenon and has clear physical significance; the result of the physical simulation experiment can also be used for verifying the existing theory and model, and verifying the correctness of the hypothesis proposed in modeling, so that the theory is further perfected and developed; in addition, the novel equipment can conveniently complete experiments in a physical simulation system, different algorithms are tested, and the limitation of the scale of a system to be researched is the most obvious defect of the method. And the function of the tested equipment is generally verified by adopting a typical power system wiring mode and an operation control strategy.
Compared with a real-time simulation system, the physical dynamic simulation system can simulate the magnetic field change of the electrical equipment, the rotational inertia of the rotating motor and the like more accurately. However, in the traditional physical dynamic simulation system for testing the relay protection device, the control strategy of the fan converter is usually solidified and stored in a control chip, and in the process of testing the relay protection device of the wind power transmission system, the control strategy of the fan converter is difficult to adjust according to actual needs, so that great inconvenience is caused to testing.
Disclosure of Invention
Aiming at the problem that the traditional physical dynamic simulation system is difficult to adjust the fault characteristics of the wind power transmission system, the invention provides a relay protection test system capable of adjusting the control strategy of a fan converter, which comprises the following components:
the system comprises a real-time simulation upper computer and a real-time simulation target machine;
The real-time simulation upper computer is used for establishing a fan converter control model based on unit parameters of a pre-established physical simulation unit, generating a fan converter control program aiming at the fan converter control model, and the real-time simulation target machine is used for downloading the fan converter control program, running the fan converter control program, recording action condition data of a relay protection device to be tested, which is connected with the physical simulation unit, after the physical simulation unit is simulated to run, and determining the protection capability of the relay protection device to be tested based on the action condition data.
Optionally, the physical simulation unit includes: the system comprises a fan physical simulation unit, a converter main circuit physical simulation unit, a power system simulation unit and a voltage/current transformer simulation unit;
The fan physical simulation unit is connected with the converter main circuit physical simulation unit through a primary wiring, the converter main circuit physical simulation unit is connected with the power system simulation unit through a primary wiring, the primary side of the voltage/current transformer simulation unit is connected with the power system simulation unit, and the secondary side of the voltage/current transformer simulation unit is connected with the relay protection device to be tested.
Optionally, the fan physical simulation unit is a parameter equal proportion reduced physical model of a direct drive fan or a doubly fed fan, and the method comprises the following steps: a simulated wind turbine model and a simulated generator model.
Optionally, the converter main circuit physical simulation unit is a converter main circuit element simulation model of the parameter matching fan physical simulation unit.
Optionally, the power system simulation unit is a power system simulation model with parameters reduced in equal proportion;
and a simulation fault point is arranged in a physical simulation element of the electric power system simulation model.
Optionally, the relay protection test system further includes: a fan control subsystem;
The fan control subsystem is used for transmitting a control instruction issued by the monitoring upper computer to the fan physical simulation unit, controlling the rotating speed and the torque of the fan physical simulation unit according to the control instruction, sampling the rotating speed and the torque of the fan physical simulation unit, and uploading the sampled value to the monitoring upper computer.
Optionally, the fan control subsystem is used for adjusting the generating power and the protection fixed value of the fan physical simulation unit according to the control instruction.
Optionally, the real-time simulation target machine is further used for controlling a physical simulation unit of the main circuit of the converter;
the control of the converter main circuit physical simulation unit comprises the following steps: and outputting a converter pulse signal or a reference signal to the converter main circuit physical simulation unit, adjusting control parameters of the converter main circuit physical simulation unit, and mapping the control parameters to a fan converter control program.
Optionally, the real-time simulation target machine is further used for sampling the electrical quantity of the relay protection device to be tested to obtain an electrical quantity sampling value;
The electrical quantity sampling value includes: grid side/machine side voltage/current and dc bus voltage.
Optionally, the relay protection test system further includes: an interface conversion unit;
The interface conversion unit is used for communication between the converter main circuit physical simulation unit and the real-time simulation target machine.
Optionally, the real-time simulation target machine includes a man-machine interaction interface, and the man-machine interaction interface is used for actively adjusting the control parameters.
In still another aspect, the present invention further provides a relay protection test method of a relay protection test system capable of adjusting a control strategy of a fan converter, including:
Establishing a fan converter control model based on unit parameters of a pre-established physical simulation unit through a real-time simulation upper computer, and generating a fan converter control program aiming at the fan converter control model;
Downloading the fan converter control program through a real-time simulation target machine, and running the fan converter control program;
and after the physical simulation unit performs simulation operation, the action condition data of the relay protection device to be tested, which is connected with the physical simulation unit, are recorded, and the protection capability of the relay protection device to be tested is determined based on the action condition data.
Compared with the prior art, the invention has the beneficial effects that:
The invention provides a relay protection test system capable of adjusting a fan converter control strategy, which comprises the following components: the system comprises a real-time simulation upper computer and a real-time simulation target machine; the real-time simulation upper computer is used for establishing a fan converter control model based on unit parameters of a pre-established physical simulation unit, generating a fan converter control program aiming at the fan converter control model, and the real-time simulation target machine is used for downloading the fan converter control program, running the fan converter control program, recording action condition data of a relay protection device to be tested, which is connected with the physical simulation unit, after the physical simulation unit is simulated to run, and determining the protection capability of the relay protection device to be tested based on the action condition data. The system can adjust different fan converter control strategies to verify the protection capability of the relay protection device, so that a physical simulation unit can be established according to different project requirements to verify the protection capability of the relay protection device.
Drawings
FIG. 1 is a schematic diagram of the system of the present invention;
FIG. 2 is a flow chart of the system test of the present invention;
FIG. 3 is a block diagram of a dynamic simulation system of a doubly-fed wind turbine for system testing according to the present invention;
FIG. 4 is a schematic diagram of fault record of the active reference value set to a low value during low voltage ride through of the doubly fed wind turbine tested by the system of the present invention;
FIG. 5 is a schematic diagram of fault recording with the active reference value set to a high value during low voltage ride through of the doubly fed wind turbine tested by the system of the present invention;
FIG. 6 is a schematic flow chart of the method of the present invention.
Detailed Description
The exemplary embodiments of the present invention will now be described with reference to the accompanying drawings, however, the present invention may be embodied in many different forms and is not limited to the examples described herein, which are provided to fully and completely disclose the present invention and fully convey the scope of the invention to those skilled in the art. The terminology used in the exemplary embodiments illustrated in the accompanying drawings is not intended to be limiting of the invention. In the drawings, like elements/components are referred to by like reference numerals.
Unless otherwise indicated, terms (including technical and scientific terms) used herein have the same meaning as commonly understood by one of ordinary skill in the art. In addition, it will be understood that terms defined in commonly used dictionaries should be interpreted as having a meaning that is consistent with their meaning in the context of the relevant art and will not be interpreted in an idealized or overly formal sense.
Example 1:
the invention provides a relay protection test system capable of adjusting a fan converter control strategy, as shown in fig. 1, comprising: the system comprises a real-time simulation upper computer and a real-time simulation target machine;
The real-time simulation upper computer is used for establishing a fan converter control model based on unit parameters of a pre-established physical simulation unit, generating a fan converter control program aiming at the fan converter control model, and the real-time simulation target machine is used for downloading the fan converter control program, running the fan converter control program, recording action condition data of a relay protection device to be tested, which is connected with the physical simulation unit, after the physical simulation unit is simulated to run, and determining the protection capability of the relay protection device to be tested based on the action condition data.
Wherein, physical simulation unit includes: the system comprises a fan physical simulation unit, a converter main circuit physical simulation unit, a power system simulation unit and a voltage/current transformer simulation unit;
The fan physical simulation unit is connected with the converter main circuit physical simulation unit through a primary wiring, the converter main circuit physical simulation unit is connected with the power system simulation unit through a primary wiring, the primary side of the voltage/current transformer simulation unit is connected with the power system simulation unit, and the secondary side of the voltage/current transformer simulation unit is connected with the relay protection device to be tested.
Wherein, fan physical simulation unit is direct drive fan or doubly fed fan's parameter equal proportion and reduces physical model, includes: a simulated wind turbine model and a simulated generator model.
The converter main circuit physical simulation unit is a converter main circuit element simulation model of the parameter matching fan physical simulation unit.
The power system simulation unit is a power system simulation model with parameters reduced in equal proportion;
and a simulation fault point is arranged in a physical simulation element of the electric power system simulation model.
Wherein, relay protection test system still includes: a fan control subsystem;
The fan control subsystem is used for transmitting a control instruction issued by the monitoring upper computer to the fan physical simulation unit, controlling the rotating speed and the torque of the fan physical simulation unit according to the control instruction, sampling the rotating speed and the torque of the fan physical simulation unit, and uploading the sampled value to the monitoring upper computer.
The fan control subsystem is used for adjusting the power generation power and the protection fixed value of the fan physical simulation unit according to the control instruction.
The real-time simulation target machine is also used for controlling the physical simulation unit of the main circuit of the converter;
the control of the converter main circuit physical simulation unit comprises the following steps: and outputting a converter pulse signal or a reference signal to the converter main circuit physical simulation unit, adjusting control parameters of the converter main circuit physical simulation unit, and mapping the control parameters to a fan converter control program.
The real-time simulation target machine is also used for sampling the electrical quantity of the relay protection device to be tested and obtaining an electrical quantity sampling value;
The electrical quantity sampling value includes: grid side/machine side voltage/current and dc bus voltage.
Wherein, relay protection test system still includes: an interface conversion unit;
The interface conversion unit is used for communication between the converter main circuit physical simulation unit and the real-time simulation target machine.
The real-time simulation target machine comprises a man-machine interaction interface, wherein the man-machine interaction interface is used for actively adjusting control parameters.
The invention is further illustrated by the following examples:
The fan physical simulation unit is a physical model which is reduced according to the equal proportion of parameters of the direct-drive fan or the doubly-fed fan, and comprises a simulation wind turbine and a simulation generator. The converter main circuit physical simulation unit is a converter main circuit element of a parameter matching fan physical simulation unit and comprises a machine side/net side converter, a machine side/net side filter, a direct current bus, an unloading circuit, a crowbar circuit (double-fed fan) and the like. The power system simulation unit is a power system with parameters reduced in equal proportion, and comprises physical simulation elements such as an alternating current transmission line, a transformer, a bus, a reactor, a circuit breaker, a fan booster transformer and the like. A simulation fault point is arranged in the physical simulation element, so that short-time short-circuit or open-circuit faults can be simulated. The fan physical simulation unit, the converter main circuit physical simulation unit and the power system simulation unit are connected through primary wiring.
The fan control system provides basic control protection functions of the fan physical simulation unit, including control of rotating speed, torque and the like, and the fan monitoring upper computer provides a man-machine interaction interface, so that parameters such as power generation, protection fixed value and the like of the fan physical simulation unit can be adjusted.
The real-time simulation target machine provides a control function of the converter main circuit physical simulation unit, receives an electric quantity sampling value and outputs a converter pulse signal or a reference signal to the converter main circuit physical simulation unit through the interface conversion unit, wherein the electric quantity sampling value comprises grid side/machine side voltage, current, direct current bus voltage and the like. The real-time simulation upper computer provides a man-machine interaction interface, can modify control parameters in the control model, and maps the control parameters to corresponding program variables of the real-time simulation target machine.
The primary side of the voltage/current transformer simulation unit is connected with the electric power system physical simulation unit, the secondary side of the voltage/current transformer simulation unit is connected with the relay protection device to be tested, the primary value of the electric quantity of the electric power system physical simulation unit is converted into a secondary value, the secondary value is sent to the relay protection device to be tested and the fault recorder, and the fault recorder simultaneously receives the secondary value of the electric quantity and the action signal of the relay protection device to be tested and stores the secondary value and the action signal of the relay protection device to be tested into a test record wave for a tester to analyze the action correctness of the relay protection device to be tested.
The parameter setting is carried out on the real-time simulation upper computer, so that the regulation of the fault characteristics of the wind power sending system is realized, and the regulation of the amplitude and phase angle of active and reactive currents, the regulation of positive sequence and negative sequence components, the setting of the switching strategy of the crowbar circuit of the doubly-fed wind turbine and the like in the low voltage ride through process are included, so that the test of the relay protection device under different fault characteristics is realized.
A specific test flow is shown in fig. 2.
And establishing a fan converter control model in the real-time simulation upper computer.
And generating a fan converter control program in the real-time simulation upper computer.
And downloading a fan converter control program to the real-time simulation target machine and starting to run.
And starting the fan to run in the fan monitoring upper computer.
And setting reasonable control parameters in the real-time simulation upper computer according to the requirements of test items, wherein the parameter setting is in the parameter range obtained by debugging in advance.
And monitoring the running condition of the fan, and adjusting to the required running condition by combining the requirements of the test project.
According to the type of the protection device to be tested and the test project, a fault is simulated in a physical simulation unit of the power system, and if the test circuit is protected, a short circuit point in a short time can be applied in a simulation circuit element.
And (3) observing and recording the action condition of the relay protection device to be tested, recording fault waveforms and protection action signals through a fault recorder, observing the panel message of the protection device to be tested, and judging whether the protection is operated correctly. If other items need to be tested, returning to the step five, and if other items do not need to be tested, ending the test.
The following describes verification of the system of the present invention to illustrate the effects of the present invention;
according to the system, a relay protection test system structure of a wind power transmission system adopting a double-fed fan physical simulation unit is established, and is shown in fig. 3, wherein a real-time simulation system adopts an RT-lab.
Fig. 4-5 are fault records of different values for the active current reference value during low voltage ride through of the doubly fed wind turbine, wherein the active blue curve is stator active power, the yellow curve is grid side active power, and the gray curve is active current reference value. The negative value of the stator active power indicates the output power, and the stator active power drops along with the moment of voltage drop, but then different power change trends are presented along with different active current reference values. In fig. 4, the stator active power continuously rises after falling; in fig. 5, the stator active power meets the requirement of a given value after falling, and remains constant.
Example 2:
The invention also provides a relay protection test method of the relay protection test system using the adjustable fan converter control strategy, as shown in fig. 6, comprising the following steps:
step 1, establishing a fan converter control model based on unit parameters of a pre-established physical simulation unit through a real-time simulation upper computer, and generating a fan converter control program aiming at the fan converter control model;
Step 2, downloading the fan converter control program through a real-time simulation target machine, and running the fan converter control program;
And step 3, after the physical simulation unit performs simulation operation, recording action condition data of the relay protection device to be tested, which is connected with the physical simulation unit, and determining the protection capability of the relay protection device to be tested based on the action condition data.
The system can adjust different fan converter control strategies to verify the protection capability of the relay protection device, so that a physical simulation unit can be established according to different project requirements to verify the protection capability of the relay protection device.
It will be appreciated by those skilled in the art that embodiments of the present invention may be provided as a method, system, or computer program product. Accordingly, the present invention may take the form of an entirely hardware embodiment, an entirely software embodiment or an embodiment combining software and hardware aspects. Furthermore, the present invention may take the form of a computer program product embodied on one or more computer-usable storage media (including, but not limited to, disk storage, CD-ROM, optical storage, and the like) having computer-usable program code embodied therein. The scheme in the embodiment of the invention can be realized by adopting various computer languages, such as object-oriented programming language Java, an transliteration script language JavaScript and the like.
The present invention is described with reference to flowchart illustrations and/or block diagrams of methods, apparatus (systems) and computer program products according to embodiments of the invention. It will be understood that each flow and/or block of the flowchart illustrations and/or block diagrams, and combinations of flows and/or blocks in the flowchart illustrations and/or block diagrams, can be implemented by computer program instructions. These computer program instructions may be provided to a processor of a general purpose computer, special purpose computer, embedded processor, or other programmable data processing apparatus to produce a machine, such that the instructions, which execute via the processor of the computer or other programmable data processing apparatus, create means for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.
These computer program instructions may also be stored in a computer-readable memory that can direct a computer or other programmable data processing apparatus to function in a particular manner, such that the instructions stored in the computer-readable memory produce an article of manufacture including instruction means which implement the function specified in the flowchart flow or flows and/or block diagram block or blocks.
These computer program instructions may also be loaded onto a computer or other programmable data processing apparatus to cause a series of operational steps to be performed on the computer or other programmable apparatus to produce a computer implemented process such that the instructions which execute on the computer or other programmable apparatus provide steps for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.
While preferred embodiments of the present invention have been described, additional variations and modifications in those embodiments may occur to those skilled in the art once they learn of the basic inventive concepts. It is therefore intended that the following claims be interpreted as including the preferred embodiments and all such alterations and modifications as fall within the scope of the invention.
It will be apparent to those skilled in the art that various modifications and variations can be made to the present invention without departing from the spirit or scope of the invention. Thus, it is intended that the present invention also include such modifications and alterations insofar as they come within the scope of the appended claims or the equivalents thereof.
Claims (12)
1. A relay protection test system capable of adjusting a fan converter control strategy is characterized by comprising: the system comprises a real-time simulation upper computer and a real-time simulation target machine;
The real-time simulation upper computer is used for establishing a fan converter control model based on unit parameters of a pre-established physical simulation unit, generating a fan converter control program aiming at the fan converter control model, and the real-time simulation target machine is used for downloading the fan converter control program, running the fan converter control program, recording action condition data of a relay protection device to be tested, which is connected with the physical simulation unit, after the physical simulation unit is simulated to run, and determining the protection capability of the relay protection device to be tested based on the action condition data.
2. The relay protection test system of claim 1, wherein the physical simulation unit comprises: the system comprises a fan physical simulation unit, a converter main circuit physical simulation unit, a power system simulation unit and a voltage/current transformer simulation unit;
The fan physical simulation unit is connected with the converter main circuit physical simulation unit through a primary wiring, the converter main circuit physical simulation unit is connected with the power system simulation unit through a primary wiring, the primary side of the voltage/current transformer simulation unit is connected with the power system simulation unit, and the secondary side of the voltage/current transformer simulation unit is connected with the relay protection device to be tested.
3. The relay protection test system of claim 2, wherein the fan physical simulation unit is a parameter equal proportion reduced physical model of a direct drive fan or a doubly fed fan, comprising: a simulated wind turbine model and a simulated generator model.
4. The relay protection test system according to claim 2, wherein the converter main circuit physical simulation unit is a converter main circuit element simulation model of a parameter matching fan physical simulation unit.
5. The relay protection test system according to claim 2, wherein the power system simulation unit is a power system simulation model with reduced parameters in equal proportion;
and a simulation fault point is arranged in a physical simulation element of the electric power system simulation model.
6. The relay protection test system of claim 1, further comprising: a fan control subsystem;
The fan control subsystem is used for transmitting a control instruction issued by the monitoring upper computer to the fan physical simulation unit, controlling the rotating speed and the torque of the fan physical simulation unit according to the control instruction, sampling the rotating speed and the torque of the fan physical simulation unit, and uploading the sampled value to the monitoring upper computer.
7. The relay protection test system of claim 6, wherein the fan control subsystem is configured to adjust a generated power and a protection setpoint of the fan physical simulation unit according to the control command.
8. The relay protection test system according to claim 1, wherein the real-time simulation target machine is further configured to control a physical simulation unit of the main circuit of the converter;
the control of the converter main circuit physical simulation unit comprises the following steps: and outputting a converter pulse signal or a reference signal to the converter main circuit physical simulation unit, adjusting control parameters of the converter main circuit physical simulation unit, and mapping the control parameters to a fan converter control program.
9. The relay protection test system according to claim 1, wherein the real-time simulation target machine is further configured to sample an electrical quantity of the relay protection device to be tested, and obtain an electrical quantity sampling value;
The electrical quantity sampling value includes: grid side/machine side voltage/current and dc bus voltage.
10. The relay protection test system of claim 1, further comprising: an interface conversion unit;
The interface conversion unit is used for communication between the converter main circuit physical simulation unit and the real-time simulation target machine.
11. The relay protection testing system of claim 1, wherein the
The real-time simulation target machine comprises a man-machine interaction interface, wherein the man-machine interaction interface is used for actively adjusting control parameters.
12. The relay protection testing method of a relay protection testing system of any one of adjustable fan converter control strategies according to claims 1-11, wherein the relay protection testing method comprises:
Establishing a fan converter control model based on unit parameters of a pre-established physical simulation unit through a real-time simulation upper computer, and generating a fan converter control program aiming at the fan converter control model;
Downloading the fan converter control program through a real-time simulation target machine, and running the fan converter control program;
and after the physical simulation unit performs simulation operation, the action condition data of the relay protection device to be tested, which is connected with the physical simulation unit, are recorded, and the protection capability of the relay protection device to be tested is determined based on the action condition data.
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