CN107169213B - Method, device and system for testing function indexes of zero-sequence current adaptive protection device - Google Patents
Method, device and system for testing function indexes of zero-sequence current adaptive protection device Download PDFInfo
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Abstract
The invention relates to a method for testing a function index of a zero sequence current self-adaptive protection device, which comprises the following steps: initializing a power distribution network networking model in a real-time digital simulator according to actual operation information of the multi-loop power distribution network; obtaining a current fault condition according to the fault occurrence model; controlling a real-time digital simulator to perform power distribution network simulation under the current fault condition to obtain a first current-voltage analog signal of the power distribution network; acquiring a zero-sequence current compensation value and a digital control signal which are output by the zero-sequence current adaptive protection device according to the first current-voltage analog signal; adjusting a power distribution network networking model, and controlling the real-time digital simulator to perform power distribution network simulation again to obtain a second current-voltage analog signal of the power distribution network; and determining the function index of the device according to the fault condition, the zero sequence current compensation value and the first and second current and voltage analog signals. The invention can comprehensively test the functional indexes of the zero-sequence current self-adaptive protection device and has low test cost.
Description
Technical Field
The invention relates to the field of power system simulation, in particular to a method, a device, a system, a storage medium and computer equipment for testing a function index of a zero-sequence current self-adaptive protection device.
Background
In a three-phase four-wire system circuit, the vector sum of the three-phase currents is equal to zero. If a current transformer is connected into the three-phase three-wire, the induced current is zero. When an electric shock or electric leakage fault occurs in the circuit, leakage current flows through the loop, and the sum of the three-phase current phasors passing through the current transformer is unequal to zero. Thus, the secondary coil of the current transformer has an induced current, which is applied to the electronic amplifying circuit of the detecting part, and compared with the preset action current value of the protection area device, if the induced current is larger than the preset action current, the sensitive relay is actuated. The current transformer connected here is called zero sequence current transformer, the sum of the phasors of the three-phase current is not equal to zero, and the generated current is the zero sequence current.
In an electric power system, zero sequence current protection is an important grounding protection method. The zero sequence current self-adaptive protection device can be used for dealing with the occurrence of multi-loop in-phase complex ground faults of a small-resistance grounding system, and the setting value of the self-adaptive zero sequence current protection can be changed along with the types of the ground faults, the system operation mode and the distribution change of a grounded neutral point. When the zero sequence current adaptive protection device is selected, all functions of the zero sequence current adaptive protection device need to be examined, and the applicability of the zero sequence current adaptive protection device under different working conditions of a small resistance grounding system is tested. The traditional assessment mode adopts a field test mode, but the implementation cost of the assessment mode is high; and because field test can not simulate some complex working conditions, such as low resistance grounding system developmental fault, multi-circuit fault, etc., the performance of the zero sequence current self-adaptive protection device can not be evaluated comprehensively.
Disclosure of Invention
Based on this, the embodiments of the present invention provide a method, an apparatus, a system, a storage medium, and a computer device for testing a functional index of a zero sequence current adaptive protection apparatus, which can comprehensively test the functional index of the zero sequence current adaptive protection apparatus, and have a low test cost.
The invention provides a method for testing the function index of a zero sequence current self-adaptive protection device on the one hand, which comprises the following steps:
initializing a power distribution network networking model pre-established in a real-time digital simulator according to actual operation information of the multi-loop power distribution network with the small resistor grounded;
obtaining a current fault condition according to a fault occurrence model corresponding to the power distribution network networking model in the real-time digital simulator;
controlling a real-time digital simulator to simulate the multi-loop power distribution network under the current fault condition based on the current power distribution network networking model to obtain a first current-voltage analog signal of the multi-loop power distribution network;
the first current-voltage analog signal is transmitted to a zero sequence current self-adaptive protection device to be tested; acquiring a zero-sequence current compensation value and a digital control signal output by the zero-sequence current adaptive protection device according to the first current-voltage analog signal;
adjusting the power distribution network networking model according to the digital control signal, and controlling a real-time digital simulator to perform multi-loop power distribution network simulation again based on the adjusted power distribution network networking model to obtain a second current-voltage analog signal of the multi-loop power distribution network;
and determining the function index of the zero-sequence current self-adaptive protection device according to the fault condition, the current compensation value, the first current-voltage analog signal and the second current-voltage analog signal.
A device for testing the function index of a zero sequence current self-adaptive protection device comprises:
the initialization module is used for initializing a power distribution network networking model which is pre-established in the real-time digital simulator according to the actual operation information of the multi-loop power distribution network with the small resistance grounded;
the fault condition generation module is used for obtaining the current fault condition according to a fault occurrence model corresponding to the power distribution network networking model in the real-time digital simulator;
the primary simulation module is used for controlling the real-time digital simulator to simulate the multi-loop power distribution network under the current fault condition based on the current power distribution network networking model so as to obtain a first current-voltage analog signal of the multi-loop power distribution network;
the device information acquisition module is used for transmitting the first current-voltage analog signal to a zero sequence current self-adaptive protection device to be tested; acquiring a zero-sequence current compensation value and a digital control signal output by the zero-sequence current adaptive protection device according to the first current-voltage analog signal;
the secondary simulation module is used for adjusting the power distribution network networking model according to the digital control signal, and controlling the real-time digital simulator to perform multi-loop power distribution network simulation again based on the adjusted power distribution network networking model to obtain a second current-voltage simulation signal of the multi-loop power distribution network;
and the index determining module is used for determining the functional index of the zero sequence current self-adaptive protection device according to the fault condition, the current compensation value, the first current-voltage analog signal and the second current-voltage analog signal.
A system for testing the function index of the zero sequence current adaptive protection device comprises: the system comprises a real-time digital simulator, a power amplifier and a zero sequence current self-adaptive protection device to be tested; a power distribution network networking model and a corresponding fault occurrence model are established in the real-time digital simulator;
an analog signal output interface of the real-time digital simulator is connected with an input interface of the power amplifier, and an output interface of the power amplifier is connected with an analog signal input interface of the zero sequence current self-adaptive protection device to be tested; a digital signal input interface of the real-time digital simulator is connected with a digital signal output interface of the zero-sequence current self-adaptive protection device;
the real-time digital simulator outputs a first current-voltage analog signal of the multi-loop power distribution network under the current fault condition, which is obtained based on the power distribution network networking model and the fault occurrence model in a simulation mode, to the power amplifier; amplifying the first current-voltage analog signal through a power amplifier, and outputting the amplified analog signal to the zero-sequence current adaptive protection device; the zero sequence current self-adaptive protection device outputs a corresponding digital control signal to the real-time digital simulator; the zero-sequence current self-adaptive protection device also outputs a zero-sequence current compensation value under the current fault condition;
the real-time digital simulator adjusts a power distribution network networking model according to the digital control signal output by the zero sequence current self-adaptive protection device, and performs multi-loop power distribution network simulation again based on the adjusted power distribution network networking model to obtain a second current-voltage analog signal of the multi-loop power distribution network;
and determining a functional index of the zero-sequence current self-adaptive protection device according to the simulated fault condition in the real-time digital simulator, the zero-sequence current compensation value output by the zero-sequence current self-adaptive protection device, and the first current-voltage analog signal and the second current-voltage analog signal obtained by the simulation of the real-time digital simulator.
A computer-readable storage medium, on which a computer program is stored which, when being executed by a processor, carries out the steps of the method as described above.
A computer device comprising a memory, a processor and a computer program stored on the memory and executable on the processor, the processor implementing the steps of the method described above when executing the program.
According to the technical scheme, various working conditions of a production field of the multi-loop power distribution network are simulated based on the real-time digital simulator, so that relevant function indexes of the zero-sequence current self-adaptive protection device can be comprehensively detected, actual wiring modification of a transformer substation is not needed, an experimental field can be reduced, and the test cost is saved.
Drawings
Fig. 1 is a schematic flow chart of a method for testing a functional index of a zero-sequence current adaptive protection device according to an embodiment;
FIG. 2 is a schematic diagram of a power distribution network networking model according to an embodiment;
FIG. 3 is a schematic diagram of a fault occurrence model of an embodiment;
fig. 4 is an application environment diagram of a method for testing a function index of a zero sequence current adaptive protection device according to an embodiment;
fig. 5 is a flowchart of a method for testing a function index of the zero-sequence current adaptive protection device in the application scenario of fig. 4;
fig. 6 is a schematic structural diagram of an apparatus for testing a function index of a zero sequence current adaptive protection apparatus according to an embodiment.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is described in further detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.
Fig. 1 is a schematic flow chart of a method for testing a functional index of a zero-sequence current adaptive protection device according to an embodiment; as shown in fig. 1, the method for testing a function index of a zero-sequence current adaptive protection device in this embodiment includes the steps of:
and S11, initializing a distribution network networking model pre-established in the real-time digital simulator according to the actual operation information of the multi-loop distribution network with the small resistance grounded.
The power distribution network networking model can reflect networking information of the multi-loop power distribution network with the small resistance grounded, and the networking information comprises networking structure information, element state and/or parameter information and the like.
And S12, obtaining the current fault condition according to the fault occurrence model corresponding to the power distribution network networking model in the real-time digital simulator.
In an optional embodiment, the method further includes the steps of establishing a power distribution network networking model in a real-time digital simulator in advance, and establishing a fault occurrence model corresponding to the power distribution network networking model. The fault occurrence model is associated with the power distribution network networking model, and the power distribution network networking model can be adjusted by setting the model parameters of the fault occurrence model, so that the effect of the corresponding working condition of the multi-loop power distribution network can be simulated.
Preferably, the fault condition comprises: fault location, time of occurrence of the fault, number of faulty lines, transition resistance, initial angle of ground, and/or intermittent time, etc. Through the pre-established distribution network networking model and the fault occurrence model in the real-time digital simulator, various different fault conditions can be simulated, and further the functional indexes of the zero-sequence current self-adaptive protection device under different fault conditions can be tested.
And S13, controlling the real-time digital simulator to perform multi-loop power distribution network simulation under the current fault condition based on the current power distribution network networking model, and obtaining a first current-voltage analog signal of the multi-loop power distribution network.
The real-Time Digital simulator RTDS (real Time Digital simulator) can realize real-Time output based on a Digital processor and parallel calculation, and simultaneously adopts a kilomega processor card to greatly reduce the simulation step length to 20 microseconds, and the response can be accurate to 9 kHz. The RTDS is based on a power distribution network networking model, and can comprehensively, completely and truly simulate the transient and steady state of a power grid system in a laboratory environment.
S14, transmitting the first current-voltage analog signal to a zero sequence current self-adaptive protection device to be tested; and acquiring a zero sequence current compensation value and a digital control signal output by the zero sequence current adaptive protection device according to the first current-voltage analog signal.
And S15, adjusting the power distribution network networking model according to the digital control signal, and controlling the real-time digital simulator to perform multi-loop power distribution network simulation again based on the adjusted power distribution network networking model to obtain a second current-voltage analog signal of the multi-loop power distribution network.
And S16, determining a function index of the zero sequence current adaptive protection device according to the fault condition, the current compensation value, the first current-voltage analog signal and the second current-voltage analog signal.
The RTDS can be connected with an actual zero-sequence current self-adaptive protection device to form a flexible and convenient closed loop, and can simulate various complex and severe working conditions which are difficult to realize or are not allowed to appear in an actual power system. Therefore, the RTDS is connected with the zero sequence current self-adaptive protection device for simulation test, the defects of the traditional field test can be effectively overcome, the functional indexes of the device can be comprehensively tested, and the test cost can be saved.
In an optional embodiment, the power distribution network networking model may include: a primary network model, a transformer model, a grounded transformer model, a small resistance model, an overhead line model, and/or a load model, etc. Preferably, referring to fig. 2, the main network model adopts an ideal voltage source, the transformer model adopts a three-phase bifilar transformer model, the grounding transformer model adopts a Z-type grounding transformer model, and the overhead line model adopts a centralized parameter line model.
In an alternative embodiment, referring to fig. 3, in the real-time digital simulator, a corresponding electrical data extraction model, a zero-sequence current compensation model, an electrical data processing model and/or a result display model may also be established in advance. The electrical data extraction model is used for extracting relevant electrical data from the fault occurrence model, and the relevant electrical data comprises zero sequence voltage and zero sequence current; the electrical data processing model is used for correspondingly processing the extracted fault occurrence parameters to obtain the current fault condition; the zero sequence current compensation model is used for adaptively correcting the zero sequence current of each fault line into the zero sequence current value of the single fault line when the fault occurs in multiple lines; the result display model is used for outputting and displaying the current fault condition and the zero sequence current and the zero sequence voltage under the fault condition. In addition, the result display model is also used for outputting and displaying the simulation result of the real-time digital simulation multi-loop power distribution network, for example, the first current-voltage analog signal and the second current-voltage analog signal are output and displayed. Preferably, the fault generation model adopts single-phase earth fault, and can set fault moment, transition resistance, intermittent earth fault and fixed earth initial angle; the result display model presents relevant information in the form of tables and/or curves.
In an optional embodiment, the step S16 specifically includes: and determining a zero sequence current adaptive protection action time index, a zero sequence current adaptive value index and/or a zero sequence current compensation effect index of the zero sequence current adaptive protection device according to the fault condition, the current compensation value, the first current voltage analog signal and the second current voltage analog signal. Specific examples thereof include:
the zero sequence current self-adaptive protection action time index can be obtained according to the time difference between the time when the zero sequence current self-adaptive protection device sends out the digital control signal and the time when the fault occurs; the zero sequence current adaptive value can be obtained according to the current compensation value; the zero-sequence current compensation effect can be obtained according to the difference between the current compensation value and the zero-sequence current in the first current-voltage analog signal; in addition, whether the fault is relieved or not is judged by comparing and analyzing the first current-voltage analog signal and the second current-voltage analog signal, and when the fault is relieved, the protection action of the zero-sequence current self-adaptive protection device is determined to be reliable.
It can be understood that the method for testing the zero-sequence current adaptive protection device of the above embodiment is suitable for a functional index test of the adaptive zero-sequence three-stage overcurrent protection device, a functional index test of the adaptive zero-sequence inverse time-limit overcurrent protection device, and/or a functional index test of the adaptive zero-sequence post-acceleration protection device, and is also suitable for a functional index test of a conventional three-stage overcurrent protection device.
Fig. 4 is a specific application scenario diagram of the method for testing a function index of a zero-sequence current adaptive protection device according to an embodiment of the present invention, and as shown in fig. 4, the application scenario is as follows: and connecting the RTDS and the zero sequence current self-adaptive protection device to be tested through a power amplifier to form a closed loop test platform. The test platform can realize related function tests of the zero-sequence current self-adaptive protection device under different fault conditions. A primary system (namely a power distribution network networking model) and a secondary system (comprising a fault occurrence model, an electrical data extraction model, a zero sequence current compensation model, an electrical data processing model and a result display model) of a multi-loop power distribution network test model with small resistance grounding are established in the RTDS, and the RTDS can realize real-time simulation and test operation of the multi-loop power distribution network based on the primary system and the secondary system. The fault generation model adopts single-phase earth fault, and can set fault moment, transition resistance, intermittent earth fault and fixed earth initial angle; when a fault of multiple loops occurs, the zero sequence current compensation model adaptively corrects the zero sequence current of each fault line into the zero sequence current value of the single fault of the loop in real time.
Based on the primary system and the secondary system, the step of simulating multiple fault conditions of the multi-circuit power distribution network comprises the following steps of: connecting a corresponding line in the power distribution network networking model with the fault occurrence model to simulate a corresponding fault position; simulating the corresponding fault occurrence time by adjusting the fault time parameter of the fault occurrence model; connecting a plurality of lines in a power distribution network networking model with a fault generation submodule to simulate the number of corresponding fault lines; simulating a corresponding transition resistance by adjusting the transition resistance parameter in the fault occurrence model; simulating a corresponding ground initial angle by adjusting a fixed ground initial angle in a fault generation model; and simulating the corresponding intermittent time of the fault by adjusting the time parameter of the intermittent earth fault in the fault occurrence model. Namely: the fault position is realized by connecting different lines with a fault generation module; the fault time can be randomly set in the fault occurrence model, and any one or more faults can be caused to occur at any time; the number of fault lines can be realized by connecting a plurality of loops with the fault generation module; the transition resistance is realized by changing the transition resistance parameter in the fault occurrence model; the grounding initial angle is set through a fixed grounding initial angle setting model, and the intermittent time is set through intermittent grounding faults.
An analog signal output interface of the real-time digital simulator is connected with an input interface of the power amplifier, and an output interface of the power amplifier is connected with an analog signal input interface of the zero sequence current self-adaptive protection device to be tested; and a digital signal input interface of the real-time digital simulator is connected with a digital signal output interface of the zero-sequence current self-adaptive protection device.
The function test of the zero-sequence current self-adaptive protection device under different fault conditions can be realized based on the test platform, and the fault conditions specifically comprise different fault positions, different fault moments, different fault line numbers, different transition resistances, different grounding initial angles and different intermittent time. Correspondingly, based on the related function test of the zero sequence current adaptive protection device in the test platform, the method comprises the following steps: a zero-sequence current adaptive protection action time index, a zero-sequence current adaptive value index and/or a zero-sequence current compensation effect index and the like. The transient state of the power grid system is comprehensively, completely and truly simulated through the RTDS, and an action signal returned to the zero sequence current self-adaptive protection device forms a closed-loop test, so that the method not only can be used for evaluating the operation of the zero sequence current self-adaptive protection device, but also can be used for evaluating the reaction of a power distribution network on the normal operation or the misoperation of the zero sequence current self-adaptive protection device. The method for testing the function index of the zero sequence current adaptive protection device according to the above embodiment is further explained with reference to fig. 4 and 5.
As shown in fig. 5, the method for testing the function index of the zero-sequence current adaptive protection device in this embodiment includes the steps of:
(1) setting primary system parameters according to actual operation information of the multi-loop power distribution network with the small resistor grounded; namely, a pre-established power distribution network networking model in the real-time digital simulator is initialized.
(2) And setting a secondary system in the real-time digital simulator according to actual test requirements to form different fault conditions.
(3) The RTDS carries out real-time digital simulation according to the setting conditions of the primary system and the secondary system, and outputs a simulation result of the multi-loop power distribution network under the current fault condition, namely a first current-voltage simulation signal; the zero sequence current is amplified by a power amplifier and then transmitted to a zero sequence current self-adaptive protection device to be tested.
(4) The zero sequence current self-adaptive protection device calculates a zero sequence current compensation value through operation processing according to a current and voltage analog signal (namely, an analog signal obtained by amplifying a first current and voltage analog signal) transmitted by the power amplifier, and transmits a digital control signal to be transmitted to the RTDS.
The RTDS adjusts the distribution network networking model in the RTDS according to the digital control signal, specifically, for example, adjusts the state of a circuit breaker in the distribution network networking model according to the digital control signal.
(5) And the RTDS carries out real-time simulation to obtain a second current-voltage analog signal of the multi-loop power distribution network. The secondary system extracts and records voltage and current values before and after fault processing (namely a first current and voltage analog signal before fault processing, and a second current and voltage analog signal after fault processing). According to the fault condition, the current compensation value, the first current-voltage analog signal and the second current-voltage analog signal, relevant function indexes of the zero-sequence current self-adaptive protection device are output through a result display model after processing, and the method comprises the following steps: a zero-sequence current adaptive protection action time index, a zero-sequence current adaptive value index and/or a zero-sequence current compensation effect index and the like.
It should be noted that the above test platform is not only suitable for the functional index test of the adaptive zero-sequence three-stage overcurrent protection device, the functional index test of the adaptive zero-sequence inverse time-lag overcurrent protection device and/or the functional index test of the adaptive zero-sequence post-acceleration protection device, but also suitable for the functional index test of the conventional three-stage overcurrent protection device.
It should be noted that, for the sake of simplicity, the foregoing method embodiments are described as a series of acts or combinations, but those skilled in the art should understand that the present invention is not limited by the described order of acts, as some steps may be performed in other orders or simultaneously according to the present invention.
Based on the same idea as the method for testing the function index of the zero sequence current adaptive protection device in the above embodiment, the present invention further provides a system for testing the function index of the zero sequence current adaptive protection device, including: the system comprises a real-time digital simulator, a power amplifier and a zero sequence current self-adaptive protection device to be tested; and a power distribution network networking model and a corresponding fault occurrence model are established in the real-time digital simulator.
The output interface of the power amplifier is connected with the analog signal input interface of the zero sequence current self-adaptive protection device to be tested; and a digital signal input interface of the real-time digital simulator is connected with a digital signal output interface of the zero-sequence current self-adaptive protection device.
And the real-time digital simulator outputs a first current-voltage analog signal of the multi-loop power distribution network under the current fault condition, which is obtained based on the power distribution network networking model and the fault occurrence model simulation, to the power amplifier. And amplifying the first current-voltage analog signal through a power amplifier, and outputting the amplified analog signal to the zero-sequence current self-adaptive protection device.
The zero sequence current self-adaptive protection device outputs a corresponding digital control signal to the real-time digital simulator; the zero sequence current self-adaptive protection device also outputs a zero sequence current compensation value under the current fault condition.
And the real-time digital simulator adjusts a power distribution network networking model according to the digital control signal output by the zero sequence current self-adaptive protection device, and performs multi-loop power distribution network simulation again based on the adjusted power distribution network networking model to obtain a second current-voltage analog signal of the multi-loop power distribution network.
And determining a functional index of the zero-sequence current self-adaptive protection device according to the simulated fault condition in the real-time digital simulator, the zero-sequence current compensation value output by the zero-sequence current self-adaptive protection device, and the first current-voltage analog signal and the second current-voltage analog signal obtained by the simulation of the real-time digital simulator. Therefore, the functional indexes of the zero-sequence current self-adaptive protection device can be comprehensively tested, and the zero-sequence current self-adaptive protection device is low in cost and high in efficiency.
Based on the same idea as the method for testing the function index of the zero sequence current adaptive protection device in the embodiment, the invention also provides a device for testing the function index of the zero sequence current adaptive protection device, which can be used for executing the method for testing the function index of the zero sequence current adaptive protection device. For convenience of explanation, in the structural schematic diagram of the embodiment of the apparatus for testing the function index of the zero sequence current adaptive protection apparatus, only the part related to the embodiment of the present invention is shown, and those skilled in the art will understand that the illustrated structure does not constitute a limitation to the system, and may include more or less components than those illustrated, or combine some components, or arrange different components.
Fig. 6 is a schematic structural diagram of an apparatus for testing a function index of a zero-sequence current adaptive protection apparatus according to an embodiment of the present invention. As shown in fig. 6, the apparatus for testing a function index of a zero sequence current adaptive protection device in this embodiment includes: the initialization module 610, the fault condition generation module 620, the primary simulation module 630, the device information acquisition module 640, the secondary simulation module 650, and the index determination module 660, each of which is described in detail as follows:
the initialization module 610 is configured to initialize a power distribution network networking model pre-established in the real-time digital simulator according to actual operation information of the multi-loop power distribution network with a small resistance grounded;
the fault condition generating module 620 is configured to obtain a current fault condition according to a fault occurrence model corresponding to the networking model of the power distribution network in the real-time digital simulator;
the primary simulation module 630 is configured to control the real-time digital simulator to perform multi-loop power distribution network simulation under the current fault condition based on the current power distribution network networking model, so as to obtain a first current-voltage analog signal of the multi-loop power distribution network;
the device information obtaining module 640 is configured to transmit the first current-voltage analog signal to a zero sequence current adaptive protection device to be tested; acquiring a zero-sequence current compensation value and a digital control signal output by the zero-sequence current adaptive protection device according to the first current-voltage analog signal;
the secondary simulation module 650 is configured to adjust the power distribution network networking model according to the digital control signal, and control the real-time digital simulator to perform multi-loop power distribution network simulation again based on the adjusted power distribution network networking model, so as to obtain a second current-voltage analog signal of the multi-loop power distribution network;
the index determining module 660 is configured to determine a functional index of the zero-sequence current adaptive protection device according to the fault condition, the current compensation value, the first current-voltage analog signal, and the second current-voltage analog signal.
In an optional embodiment, the networking model of the power distribution network includes: a primary network model, a transformer model, a grounded transformer model, a small resistance model, an overhead line model, and/or a load model.
In an alternative embodiment, the fault condition includes: fault location, time of occurrence of fault, number of faulty lines, transition resistance, initial angle of ground, and/or intermittent time.
In an optional embodiment, the index determining module 660 is specifically configured to: and determining a zero sequence current adaptive protection action time index, a zero sequence current adaptive value index and/or a zero sequence current compensation effect index of the zero sequence current adaptive protection device according to the fault condition, the current compensation value, the first current voltage analog signal and the second current voltage analog signal.
In an optional embodiment, the device information obtaining module 650 is specifically configured to input the first current-voltage analog signal into a power amplifier for amplification, and transmit the amplified analog signal to the zero-sequence current adaptive protection device to be tested through the power amplifier.
It should be noted that in the above embodiment of the device for testing a function index of a zero sequence current adaptive protection device, contents such as information interaction and execution process between modules are the same as those of the method embodiment of the present invention based on the same concept, and therefore, the technical effect of the method embodiment of the present invention is the same as that of the method embodiment of the present invention.
In addition, in the above embodiment of the apparatus for testing a function index of a zero-sequence current adaptive protection device, the logical division of each functional module is only an example, and in practical applications, the above function allocation may be completed by different functional modules according to needs, for example, due to the configuration requirements of corresponding hardware or the convenience of implementation of software, that is, the internal structure of the apparatus for testing a function index of a zero-sequence current adaptive protection device is divided into different functional modules to complete all or part of the above described functions. The functional modules can be realized in a hardware mode or a software functional module mode.
It will be understood by those skilled in the art that all or part of the processes of the methods of the above embodiments may be implemented by a computer program, which is stored in a computer readable storage medium and sold or used as a stand-alone product. The program, when executed, may perform all or a portion of the steps of the embodiments of the methods described above. In addition, the storage medium may be provided in a computer device, and the computer device further includes a processor, and when the processor executes the program in the storage medium, all or part of the steps of the embodiments of the methods described above can be implemented. The storage medium may be a magnetic disk, an optical disk, a Read-only Memory (ROM), a Random Access Memory (RAM), or the like.
In the above embodiments, the descriptions of the respective embodiments have respective emphasis, and for parts that are not described in detail in a certain embodiment, reference may be made to related descriptions of other embodiments. It will be understood that the terms "first," "second," and the like as used herein are used herein to distinguish one object from another, but the objects are not limited by these terms.
The above-described examples merely represent several embodiments of the present invention and should not be construed as limiting the scope of the invention. It should be noted that, for a person skilled in the art, several variations and modifications can be made without departing from the inventive concept, which falls within the scope of the present invention. Therefore, the protection scope of the present patent shall be subject to the appended claims.
Claims (10)
1. A method for testing the function index of a zero sequence current adaptive protection device is characterized by comprising the following steps:
initializing a power distribution network networking model pre-established in a real-time digital simulator according to actual operation information of the multi-loop power distribution network with the small resistor grounded;
obtaining a current fault condition according to a fault occurrence model corresponding to the power distribution network networking model in the real-time digital simulator;
controlling a real-time digital simulator to simulate the multi-loop power distribution network under the current fault condition based on the current power distribution network networking model to obtain a first current-voltage analog signal of the multi-loop power distribution network;
the first current-voltage analog signal is transmitted to a zero sequence current self-adaptive protection device to be tested; acquiring a zero-sequence current compensation value and a digital control signal output by the zero-sequence current adaptive protection device according to the first current-voltage analog signal;
adjusting the power distribution network networking model according to the digital control signal, and controlling a real-time digital simulator to perform multi-loop power distribution network simulation again based on the adjusted power distribution network networking model to obtain a second current-voltage analog signal of the multi-loop power distribution network;
determining a function index of the zero-sequence current adaptive protection device according to the fault condition, the zero-sequence current compensation value, the first current-voltage analog signal and the second current-voltage analog signal; the functional indicators include: the zero sequence current self-adaptive protection action time index, the zero sequence current self-adaptive value index and/or the zero sequence current compensation effect index.
2. The method of claim 1, wherein the power distribution network networking model comprises: a primary network model, a transformer model, a grounded transformer model, a small resistance model, an overhead line model, and/or a load model.
3. The method of claim 1, wherein the fault condition comprises: fault location, time of occurrence of fault, number of faulty lines, transition resistance, initial angle of ground, and/or intermittent time.
4. The method for testing the function index of the zero sequence current adaptive protection device according to any one of claims 1 to 3, wherein the step of transmitting the first current-voltage analog signal to the zero sequence current adaptive protection device to be tested comprises:
and inputting the first current-voltage analog signal into a power amplifier for amplification, and transmitting the amplified analog signal to a zero sequence current self-adaptive protection device to be tested through the power amplifier.
5. A device for testing the function index of a zero sequence current self-adaptive protection device is characterized by comprising:
the initialization module is used for initializing a power distribution network networking model which is pre-established in the real-time digital simulator according to the actual operation information of the multi-loop power distribution network with the small resistance grounded;
the fault condition generation module is used for obtaining the current fault condition according to a fault occurrence model corresponding to the power distribution network networking model in the real-time digital simulator;
the primary simulation module is used for controlling the real-time digital simulator to simulate the multi-loop power distribution network under the current fault condition based on the current power distribution network networking model so as to obtain a first current-voltage analog signal of the multi-loop power distribution network;
the device information acquisition module is used for transmitting the first current-voltage analog signal to a zero sequence current self-adaptive protection device to be tested; acquiring a zero-sequence current compensation value and a digital control signal output by the zero-sequence current adaptive protection device according to the first current-voltage analog signal;
the secondary simulation module is used for adjusting the power distribution network networking model according to the digital control signal, and controlling the real-time digital simulator to perform multi-loop power distribution network simulation again based on the adjusted power distribution network networking model to obtain a second current-voltage simulation signal of the multi-loop power distribution network;
the index determining module is used for determining a functional index of the zero-sequence current adaptive protection device according to the fault condition, the zero-sequence current compensation value, the first current-voltage analog signal and the second current-voltage analog signal; the functional indicators include: the zero sequence current self-adaptive protection action time index, the zero sequence current self-adaptive value index and/or the zero sequence current compensation effect index.
6. The apparatus of claim 5, wherein the power distribution network networking model comprises: a main network model, a transformer model, a grounding transformer model, a small resistance model, an overhead line model and/or a load model;
and/or the presence of a gas in the gas,
the fault conditions include: fault location, time of occurrence of fault, number of faulty lines, transition resistance, initial angle of ground, and/or intermittent time.
7. The apparatus for testing function index of zero sequence current adaptive protection device according to claim 5 or 6,
the index determining module is specifically configured to determine a zero-sequence current adaptive protection action time index, a zero-sequence current adaptive value index, and/or a zero-sequence current compensation effect index of the zero-sequence current adaptive protection device according to the fault condition, the zero-sequence current compensation value, the first current-voltage analog signal, and the second current-voltage analog signal;
and/or the presence of a gas in the gas,
the device information acquisition module is specifically configured to input the first current-voltage analog signal into a power amplifier for amplification, and transmit the amplified analog signal to a zero-sequence current adaptive protection device to be tested through the power amplifier.
8. A system for testing the function index of a zero sequence current self-adaptive protection device is characterized by comprising the following components: the system comprises a real-time digital simulator, a power amplifier and a zero sequence current self-adaptive protection device to be tested; a power distribution network networking model and a corresponding fault occurrence model are established in the real-time digital simulator;
an analog signal output interface of the real-time digital simulator is connected with an input interface of the power amplifier, and an output interface of the power amplifier is connected with an analog signal input interface of the zero sequence current self-adaptive protection device to be tested; a digital signal input interface of the real-time digital simulator is connected with a digital signal output interface of the zero-sequence current self-adaptive protection device;
the real-time digital simulator outputs a first current-voltage analog signal of the multi-loop power distribution network under the current fault condition, which is obtained based on the power distribution network networking model and the fault occurrence model in a simulation mode, to the power amplifier; amplifying the first current-voltage analog signal through a power amplifier, and outputting the amplified analog signal to the zero-sequence current adaptive protection device; the zero sequence current self-adaptive protection device outputs a corresponding digital control signal to the real-time digital simulator; the zero-sequence current self-adaptive protection device also outputs a zero-sequence current compensation value under the current fault condition;
the real-time digital simulator adjusts a power distribution network networking model according to the digital control signal output by the zero sequence current self-adaptive protection device, and performs multi-loop power distribution network simulation again based on the adjusted power distribution network networking model to obtain a second current-voltage analog signal of the multi-loop power distribution network;
determining a function index of the zero-sequence current self-adaptive protection device according to the simulated fault condition in the real-time digital simulator, the zero-sequence current compensation value output by the zero-sequence current self-adaptive protection device, and the first current-voltage analog signal and the second current-voltage analog signal obtained by the simulation of the real-time digital simulator; the functional indicators include: the zero sequence current self-adaptive protection action time index, the zero sequence current self-adaptive value index and/or the zero sequence current compensation effect index.
9. A computer-readable storage medium, on which a computer program is stored which, when being executed by a processor, carries out the steps of the method of any one of claims 1 to 4.
10. A computer device comprising a memory, a processor and a computer program stored on the memory and executable on the processor, wherein the steps of the method of any of claims 1 to 4 are performed when the program is executed by the processor.
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