CN110927551B - Short-circuit current test loop of thyristor converter valve component - Google Patents
Short-circuit current test loop of thyristor converter valve component Download PDFInfo
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- CN110927551B CN110927551B CN201911218123.1A CN201911218123A CN110927551B CN 110927551 B CN110927551 B CN 110927551B CN 201911218123 A CN201911218123 A CN 201911218123A CN 110927551 B CN110927551 B CN 110927551B
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/26—Testing of individual semiconductor devices
- G01R31/2601—Apparatus or methods therefor
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/26—Testing of individual semiconductor devices
- G01R31/2607—Circuits therefor
- G01R31/263—Circuits therefor for testing thyristors
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/26—Testing of individual semiconductor devices
- G01R31/27—Testing of devices without physical removal from the circuit of which they form part, e.g. compensating for effects surrounding elements
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- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
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Abstract
The application provides a thyristor converter valve subassembly short-circuit current test return circuit, this thyristor converter valve subassembly short-circuit current test return circuit includes: the voltage applying module, the synthetic loop testing module and the short-circuit current testing module are respectively connected to the thyristor converter valve component; the synthetic loop test module is used for controlling the thyristor converter valve assembly to be in a preset normal operation preheating working condition; the synthetic loop test module is further used for acquiring voltage and current waveform information of the thyristor converter valve component when the voltage applying module applies voltage to the thyristor converter valve component and the short-circuit current test module applies short-circuit current to the thyristor converter valve component. The structure complexity of the short-circuit current test loop of the thyristor converter valve component can be reduced, and the flexibility and accuracy of the test of the thyristor converter valve component can be improved.
Description
Technical Field
The application relates to the technical field of strong current test loops, in particular to a short-circuit current test loop of a thyristor converter valve assembly.
Background
According to GB/T20990.1 part 1 of a high-voltage direct-current transmission thyristor valve: the electrical test requires that the electrical part type test of the thyristor converter valve component comprises an insulation test part and an operation test part, wherein the short-circuit current test of the thyristor converter valve component is an important content in the operation test part, and the main purpose of the test is to verify whether the design of the maximum current, the voltage and the temperature caused by the thyristor converter valve component under the most serious short-circuit current condition is correct.
The existing thyristor converter valve component short-circuit current test loop is generally composed of a synthetic loop test system and a short-circuit generator set, the short-circuit generator set can provide voltage and short-circuit current for a tested thyristor converter valve component, and the synthetic loop test system can enable the tested thyristor converter valve component to be in a normal operation preheating state. However, when the existing short-circuit current test loop of the thyristor converter valve component is used for testing the endurance capacity of the thyristor converter valve component to forward voltage, reverse voltage and multiple waves, the problems of low flexibility and low accuracy exist, and the existing test loop of the generator set also has the defects of high manufacturing cost, large occupied area and the like.
Disclosure of Invention
The thyristor converter valve assembly short-circuit current test loop can reduce the structural complexity of the thyristor converter valve assembly short-circuit current test loop and improve the flexibility and accuracy of the thyristor converter valve assembly short-circuit current test.
In order to solve the above technical problem, the present application provides the following technical solutions:
the application provides a thyristor converter valve subassembly short-circuit current test return circuit includes:
the voltage applying module, the synthetic loop testing module and the short-circuit current testing module are respectively connected to the thyristor converter valve component;
the synthetic loop test module is used for controlling the thyristor converter valve component to be in a preset normal operation preheating working condition;
the synthetic loop test module is further used for acquiring voltage and current waveform information of the thyristor converter valve component when the short-circuit current test module applies short-circuit current to the thyristor converter valve component and the voltage applying module applies voltage to the thyristor converter valve component.
Further, the voltage applying module includes: the auxiliary module and the power frequency voltage generator are connected with each other;
the auxiliary module is respectively connected with the synthetic loop test module and the thyristor converter valve assembly.
Further, the auxiliary module comprises: the auxiliary branch circuit is provided with two auxiliary thyristors which are arranged on the auxiliary branch circuit and are connected in parallel and have opposite arrangement directions; one end of the auxiliary branch is connected with the power frequency voltage generator, and the other end of the auxiliary branch is connected with the thyristor converter valve component.
Further, the auxiliary module further comprises: and the switch is arranged at the other end of the auxiliary branch.
Further, the thyristor converter valve assembly comprises: a resistor, a capacitor and a thyristor to be tested; the resistor and the capacitor are connected in series to form a series shunt circuit, and the series shunt circuit is connected with the thyristor to be tested in parallel.
Further, the short circuit current test module includes: power supply, capacitor, inductor and thyristor valve; the power supply and the capacitor are connected in parallel to form a parallel branch, and the parallel branch is connected with the inductor and the thyristor valve in series; one end of the thyristor valve is connected with the inductor, and the other end of the thyristor valve is connected with the thyristor converter valve component.
Further, the synthetic loop test module comprises: a voltage current generating circuit and a voltage current measuring part; and the two output ends of the voltage and current generating loop are respectively connected to the thyristor converter valve component.
Further, the switch is an electric disconnecting link switch.
Further, the thyristor converter valve assembly comprises: and the thyristors to be tested are connected in series.
Furthermore, one end of each of the voltage module and the synthetic loop test module is grounded.
According to the above technical solution, the present application provides a thyristor converter valve assembly short circuit current test loop, including: the voltage applying module, the synthetic loop testing module and the short-circuit current testing module are respectively connected to the thyristor converter valve component; the synthetic loop test module is used for controlling the thyristor converter valve assembly to be in a preset normal operation preheating working condition; the synthetic loop test module is also used for acquiring voltage and current waveform information of the thyristor converter valve assembly when the short-circuit current test module applies short-circuit current to the thyristor converter valve assembly and the voltage application module applies voltage to the thyristor converter valve assembly.
Drawings
In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present application, and for those skilled in the art, other drawings can be obtained according to the drawings without creative efforts.
Fig. 1 is a schematic structural diagram of a short-circuit current test loop of a thyristor converter valve component in an embodiment of the application.
FIG. 2 is a schematic structural diagram of a synthesis loop test module in an embodiment of the present application.
Fig. 3 is a connection relationship block diagram of a short-circuit current test module, a thyristor converter valve assembly and a synthetic loop test module in the embodiment of the present application.
FIG. 4 is a comparative schematic diagram of voltage and current waveforms across a thyristor converter valve assembly preheated for maintaining normal operation in a specific application example of the present application.
FIG. 5 is a schematic diagram showing a comparison of voltage and current waveforms across a thyristor converter valve assembly before and after a forward voltage is applied to a single cycle short circuit current in a specific application example of the present application.
Fig. 6 is a schematic diagram showing a comparison of voltage and current waveforms across the thyristor converter valve assembly before and after applying reverse voltage to the three-cycle short-circuit current in the specific application example of the present application.
Fig. 7 is a schematic structural diagram of a short-circuit current test loop of a thyristor converter valve assembly in a specific application example of the application.
Description of the symbols
1. A thyristor converter valve assembly;
2. a voltage application module;
21. an auxiliary module;
22. a power frequency voltage generator;
3. a synthesis loop test module;
4. short-circuit current test module.
Detailed Description
In order to make those skilled in the art better understand the technical solutions in the present specification, the technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application, and it is obvious that the described embodiments are only a part of the embodiments of the present application, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present application.
In order to reduce the structural complexity of the short-circuit current test loop of the thyristor converter valve assembly and improve the flexibility and accuracy of the test of the thyristor converter valve assembly, the application provides a specific implementation of the short-circuit current test loop of the thyristor converter valve assembly, and referring to fig. 1, the short-circuit current test loop of the thyristor converter valve assembly specifically includes the following contents:
the voltage applying module 2, the synthetic loop test module 3 and the short-circuit current test module 4 are respectively connected to the thyristor converter valve assembly 1.
The synthetic loop test module 3 is used for controlling the thyristor converter valve component 1 to be in a preset normal operation preheating working condition.
The synthetic loop test module 3 is further configured to obtain information of voltage and current waveforms of the thyristor converter valve assembly 1 when the short-circuit current test module 4 applies the short-circuit current to the thyristor converter valve assembly 1 and the voltage application module 2 applies the voltage to the thyristor converter valve assembly 1.
Specifically, the synthetic loop test module controls the thyristor converter valve assembly to be in a preset normal operation preheating working condition, the thyristor converter valve assembly is locked and output after preheating is finished, the short-circuit current test module is immediately put into the synthetic loop test module to generate single-cycle or multi-cycle short-circuit current, a voltage applying module is put into a proper position to obtain voltage and current waveforms meeting test requirements, and the voltage and current waveforms are measured and obtained by the synthetic loop test module.
The preset normal operation preheating working condition and the preheating finishing time can be set according to actual needs, and the method is not limited in the application; the synthetic loop test module, the topological structure that synthetic loop test system corresponds promptly can adopt current synthetic test loop, can realize exerting forward and reverse voltage to thyristor converter valve subassembly, provides two pulsating electric currents simultaneously, and this application does not do the restriction to this. The thyristor converter valve component can comprise a plurality of thyristors to be tested which are connected in series. Preferably, the thyristors to be tested are eight-stage thyristors and less thyristors.
Referring to fig. 2, in an embodiment of the present application, the synthetic loop test module includes a current source loop, a voltage source loop, a three-phase transformer T1 connected to the current source loop, and high-voltage incoming lines respectively connected to the three-phase transformer and the voltage source loop; the current source loop and the voltage source loop in the synthetic loop test module are respectively connected with the thyristor converter valve groupThe parts are connected, va 1-Va 5 are thyristor auxiliary valves, va 6-Va 16 are thyristor auxiliary valves, C t 、C s And C L All capacitors are used, and L1 to L4 are all reactors, in this embodiment, the thyristor converter valve Vt is the thyristor converter valve assembly.
In an embodiment of the application, the synthetic loop test module is composed of a high-voltage source and a large-current source, a test sample replaces one bridge arm of a six-pulse bridge of the current source and is connected with the voltage source in parallel, forward and reverse voltages are applied to the test sample by the voltage source, two pulsed currents are provided by the current source, and the test sample is the thyristor converter valve assembly.
The synthetic loop test module comprises a voltage current generating loop and a voltage current measuring component; and the two output ends of the voltage and current generating loop are connected to the thyristor converter valve component. The voltage and current measuring part can be a voltage divider, a Hall current sensor and the like.
In order to further improve the flexibility of the thyristor converter valve assembly test, the embodiment of the present application further provides a specific implementation manner of the voltage applying module 2 in the short-circuit current test loop of the thyristor converter valve assembly, where the voltage applying module 2 includes:
an auxiliary module 21 and a power frequency voltage generator 22 connected to each other.
One end of the power frequency voltage generator is connected with the auxiliary module 21, and the other end of the power frequency voltage generator is grounded.
The auxiliary module 21 is connected with the synthetic loop test module 3 and the thyristor converter valve assembly 1 respectively.
In order to improve the flexibility of the thyristor converter valve assembly test, the embodiment of the present application further provides a specific implementation manner of the auxiliary module 21 in the short-circuit current test loop of the thyristor converter valve assembly, where the auxiliary module 21 includes: the auxiliary branch and two parallel auxiliary thyristor valves which are arranged on the auxiliary branch and have opposite arrangement directions.
One end of the auxiliary branch is connected to the power frequency voltage generator 22, and the other end of the auxiliary branch is connected to the thyristor converter valve assembly 1.
Specifically, the auxiliary thyristor valve is applied to the voltage application module as a switch, so that the response time of conduction can be improved, and the consistency between the voltage generation time and the test requirement can be improved. The voltage waveform phase of the transformer of the voltage applying module is detected, the control program can ensure that correct voltage waveform is generated after short-circuit current, the thyristor converter valve is used as a switch of the voltage applying module, the corresponding conducting time of the thyristor converter valve is in the mu s level, the voltage generation time can be almost consistent with the test requirement, the accuracy of the voltage waveform is further improved, the voltage generation time is controlled by the program, the voltage generated at different times can be obtained by modifying control parameters, and the voltage applying module is flexible and adjustable.
In order to further improve the flexibility and the testing accuracy of the short-circuit current testing loop of the thyristor converter valve assembly, in an embodiment of the present application, the auxiliary module 21 further includes: and the switch is arranged at the other end of the auxiliary branch.
The output ends of the synthetic loop test module and the short-circuit current test module can also be provided with switches for controlling the input and the separation of the modules corresponding to the switches.
In order to further improve the flexibility of the control of the short-circuit current test loop of the thyristor converter valve component, the switch is an electric knife switch.
The embodiment of the present application further provides a specific implementation manner of the thyristor converter valve assembly 1 in the short-circuit current test loop of the thyristor converter valve assembly, where the thyristor converter valve assembly 1 specifically includes: a resistor, a capacitor and a thyristor to be tested; the resistor and the capacitor are connected in series to form a series shunt circuit, and the series shunt circuit is connected with the thyristor to be tested in parallel.
In an embodiment of the present application, a connection relationship between the short-circuit current testing module, the thyristor converter valve assembly and the synthetic loop testing module is shown in fig. 3, K v1 ～K v3 、K s1 ～K s2 And K R1 ～K R3 Are all switches, U d1 For power supply, V1-V5 are all thyristor auxiliary valves, C1-C3 are all resistors, L1EL3 is a reactor; the test valve Vt is the thyristor converter valve assembly described above.
In order to provide a short-circuit current required by a test for a thyristor converter valve assembly and further improve the accuracy of the test, the embodiment of the application further provides a specific implementation manner of a short-circuit current test module 4 in a short-circuit current test loop of the thyristor converter valve assembly, where the short-circuit current test module 4 specifically includes:
power supply, capacitor, inductor and thyristor valve; the power supply and the capacitor are connected in parallel to form a parallel branch, and the parallel branch is connected with the inductor and the thyristor valve in series; one end of the thyristor valve is connected with the inductor, and the other end of the thyristor valve is connected with the thyristor converter valve component.
Specifically, when a current test of the thyristor converter valve assembly is carried out, the power supply and the capacitor are connected in parallel for charging, the power supply is disconnected after charging is completed, and at the moment, the capacitor is sequentially connected with the inductor and the thyristor valve in series. The short-circuit current test module is a short-circuit current loop in an LC oscillation mode, and compared with a short-circuit current loop in an existing generator set mode, after short circuit is completed, voltage cannot be generated by the short-circuit current test module, and extra equipment or loop supply is needed. The synthesis loop test module may be replaced with a run test loop that provides the pre-heat voltage current conditions for the test article assembly.
Specifically, the thyristor converter valve assembly is a tested object; and the synthesis loop module is used for preheating the test article. According to the requirement of 11 valve fault current tests in the national standard GB/T20990.1-2007, before the tests are carried out, the operation of the valve or the valve component is required to reach the maximum continuous operation thyristor junction temperature; the short-circuit current loop is used for providing short-circuit current; the industrial frequency voltage generator is used for generating forward voltage and reverse voltage after short-circuit current required in 11-valve fault current test in GB/T20990.1-2007, and is used for carrying out short-circuit current tests, such as single-cycle short-circuit test and three-cycle short-circuit test; an auxiliary module: the voltage generated by the power frequency voltage generator is applied to the thyristor converter valve component at a proper moment and phase, and the thyristor converter valve component can be regarded as a high-speed switch.
In order to further reduce the structural complexity of the short-circuit current test loop of the thyristor converter valve assembly and improve the flexibility and accuracy of the short-circuit current test of the thyristor converter valve assembly, embodiments of the present application further provide a specific implementation manner of the test method of the short-circuit current test loop of the thyristor converter valve assembly, and the test method of the short-circuit current test loop of the thyristor converter valve assembly specifically includes the following contents:
step 100: the synthesis loop test module provides voltage and current for preheating operation for the thyristor converter valve component.
Step 200: and when the preset time point is reached, the synthetic loop test module is controlled to stop outputting the voltage and the current, and meanwhile, the short-circuit current test module provides short-circuit current for the thyristor converter valve component at a first time point after the preset time point.
Step 300: and the voltage applying module provides alternating voltage to the thyristor converter valve component at a second time point after the short-circuit current testing module provides current to the thyristor converter valve component.
Specifically, the alternating voltage is a specific phase alternating voltage.
Step 400: and the voltage and current measuring device connected with the thyristor converter valve component measures and outputs and displays the voltage and current value applied to the thyristor converter valve component.
The first time point and the second time point may be set according to an actual situation, which is not limited in the present application. According to the real-time voltage and current of the thyristor converter valve displayed by the output, the stability and the tolerance of the thyristor converter valve component can be detected, and the detection accuracy is improved.
Referring to fig. 4, a schematic diagram of voltage and current waveforms at two ends of a thyristor converter valve assembly preheated for maintaining normal operation in a specific application example of the present application is shown, where an abscissa is time (unit: ms), and ordinates corresponding to the two waveforms are respectively a current (Ivt, unit: kA) and a voltage (Uvt, unit: kv) at two ends of the thyristor converter valve assembly, and it can be known from the figure that when a voltage value is greater than 0, the voltage is a forward voltage; less than 0 is a reverse voltage.
Referring to fig. 5, a schematic diagram of voltage and current waveforms at two ends of a thyristor converter valve assembly before and after applying a forward voltage to a single cycle short circuit current in a specific application example of the present application is shown; the abscissa unit is time (unit: ms), and the ordinates corresponding to the two waveforms are respectively current (fsc, unit: kA) and voltage (Uvt, unit: kv) at two ends of the thyristor converter valve component; after the short-circuit current test module applies single-cycle short-circuit current to the thyristor converter valve component, the voltage applying module immediately applies positive sine half-wave voltage to the thyristor converter valve component; the thyristor converter valve assembly is subjected to a single-wave fault current of specified peak and on-time followed by a re-application of the forward voltage. The peak performance of the module can reach 70kV, but is not shown in the figure).
Referring to fig. 6, a schematic diagram of voltage and current waveforms at two ends of a thyristor converter valve assembly before and after applying reverse voltage to a three-cycle short-circuit current in a specific application example of the present application is shown; the abscissa unit is time (unit: ms), and the ordinates corresponding to the two waveforms are respectively current (fsc, unit: kA) and voltage (Uvt, unit: kv) at two ends of the thyristor converter valve component; after the short-circuit current test module applies a second short-circuit current cycle to the thyristor converter valve assembly, the voltage applying module immediately applies reverse voltage to the thyristor converter valve assembly; the thyristor converter valve assembly is subjected to a fault current of a prescribed number of waves applying a prescribed peak value and on-time; the thyristor converter valve assembly should withstand reverse voltages between fault current cycles, but should be protected from forward blocking voltages by the continuous firing of the thyristors. (the reverse voltage of the three cycle test is mainly after the penultimate fault current wave).
It can be understood that, in the specific application example of the present application, the synthesis loop first provides the preheating voltage current of the sample, and after the preheating is finished, the short-circuit current loop immediately provides the short-circuit current; if the test is a single-cycle fault current test, a forward sine voltage is provided by the voltage application module after the single cycle; if the test is a three-cycle fault current test, a reverse voltage is provided by the voltage applying module after the second cycle; the two modes both meet the requirement of 11 item 11 of the national standard GB/T20990.1-valve fault current test, and have good performance. Therefore, the thyristor converter valve assembly short-circuit current test loop can realize single-cycle fault current test and multiple-order fault current test, further verifies whether the target thyristor converter valve assembly or the target thyristor valve can bear forward and reverse voltages generated by locking and multiple-order open-circuit current generated after the synthesis loop test module is disconnected while inhibiting single-wave current with a maximum amplitude, and is simple in structure and convenient and fast to apply.
In order to further reduce the structural complexity of a short-circuit current test loop of the thyristor converter valve component and improve the flexibility and accuracy of the short-circuit current test of the thyristor converter valve component, the application also provides a specific application example of the short-circuit current test loops of the two thyristor converter valve components, in the application example, a synthetic loop test system is equivalent to the synthetic loop test module, a test sample valve is equivalent to the thyristor converter valve component, the short-circuit current test system is equivalent to the short-circuit current test system, and an auxiliary valve is equivalent to the auxiliary module; the synthetic loop test system firstly carries out preheating operation on the thyristor converter valve component, then when a valve fault current test is carried out, the synthetic loop test system is changed into a locking state from an operation state, short-circuit current is injected into the short-circuit current test system, after a test sample valve is closed, an auxiliary valve is opened, and power frequency voltage is added to the test sample valve at a zero crossing point (single-cycle short-circuit current test). The rated alternating voltage of the power frequency voltage generator is 60kV; the rated alternating current is 5A. The specific application example specifically comprises the following contents:
application example of short-circuit current test loop of thyristor converter valve assembly
Referring to fig. 7, in the present application example, the synthesis loop (synthesis loop test module) and the short-circuit current loop (short-circuit current test module) are respectively connected in parallel at two ends of the test article (thyristor converter valve assembly), and the high-voltage ends of the synthesis loop, the short-circuit current loop and the voltage applying module are at the anode of the test article. The synthetic loop test system can realize the function of a power supply; one end of the test article is grounded. The test article may include a plurality of thyristors to be tested connected in series. Preferably, the thyristors to be tested are eight-stage thyristors and less thyristors.
And taking the zero-crossing point (changing from zero to positive) of the power frequency voltage generator as the reference 0 moment, and simultaneously conducting the auxiliary valves of the voltage application modules at the 0 moment (or later). One half cycle time of the short circuit current was about 18ms, and the time from the lock-up of the synthetic loop test system to the injection of the short circuit current was set to 60ms. The specific implementation time sequence is as follows: locking the synthetic test loop system at the moment of 78 ms; injecting short-circuit current for a positive half wave at the time of 18 ms; the voltage application module at time 0 assists valve triggering for half cycle. During the period, the power frequency voltage generator always sends out alternating voltage, and the alternating voltage is cut off by the anti-parallel auxiliary valve so as to realize the test of adding the forward voltage to the single-wave fault current. The application example shows that the thyristor converter valve assembly short-circuit current test loop can verify the capability of the thyristor converter valve in inhibiting single-wave short-circuit current to the maximum extent.
Another application example of short-circuit current test loop of thyristor converter valve assembly
The voltage is introduced at the current zero crossing of the last fault current wave, taking the starting point of the last fault current as the reference time 0, and then the zero crossing of the voltage. The specific implementation time sequence is as follows: -100ms time synthetic test loop system lockout; injecting three positive half waves of short-circuit current at the moment of 40 ms; -2ms instant the voltage application module assists negative valve triggering in the valve for 2ms. In the period, the power frequency voltage generator always sends out alternating voltage which is cut off by the anti-parallel auxiliary valve. The test method is used for realizing the test that forward voltage is not added to the multi-wave fault current.
By combining the two application examples, the short-circuit current test loop of the thyristor converter valve assembly can verify whether the thyristor converter valve can restrain single-wave short-circuit current with the maximum amplitude or not, and can also verify whether the thyristor converter valve can bear forward voltage and reverse voltage generated by locking and can bear multi-wave open current after tripping of a circuit breaker or not.
From the above description, the present application provides a short circuit current test circuit for a thyristor converter valve assembly, comprising: the voltage applying module, the synthetic loop testing module and the short-circuit current testing module are respectively connected to the thyristor converter valve component; the thyristor converter can be in a preheating operation state through the synthesis loop test module, the short-circuit current test module provides short-circuit current for the thyristor converter valve component, the voltage application module provides alternating voltage for the thyristor converter valve component, whether the design of maximum current, voltage and temperature caused by the valve under the condition of the most serious short-circuit current is correct or not can be verified, the structural complexity of a short-circuit current test loop of the thyristor converter valve component is reduced, and the flexibility and accuracy of the test of the thyristor converter valve component can be improved.
The embodiments in the present specification are described in a progressive manner, and the same and similar parts among the embodiments are referred to each other, and each embodiment focuses on the differences from the other embodiments. In particular, for the hardware + program class embodiment, since it is substantially similar to the method embodiment, the description is simple, and the relevant points can be referred to the partial description of the method embodiment.
The foregoing description of specific embodiments has been presented for purposes of illustration and description. Other embodiments are within the scope of the following claims. In some cases, the actions or steps recited in the claims may be performed in a different order than in the embodiments and still achieve desirable results. In addition, the processes depicted in the accompanying figures do not necessarily require the particular order shown, or sequential order, to achieve desirable results. In some embodiments, multitasking and parallel processing may also be possible or may be advantageous.
Although embodiments of the present description provide method steps as described in embodiments or flowcharts, more or fewer steps may be included based on conventional or non-inventive means. The order of steps recited in the embodiments is merely one manner of performing the steps in a multitude of sequences, and does not represent a unique order of performance. When implemented in an actual device or end product, can be executed sequentially or in parallel according to the methods shown in the embodiments or figures (e.g., parallel processor or multi-thread processing environments, even distributed data processing environments). The terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, the presence of additional identical or equivalent elements in a process, method, article, or apparatus that comprises the recited elements is not excluded.
The embodiments in the present specification are described in a progressive manner, and the same and similar parts among the embodiments are referred to each other, and each embodiment focuses on the differences from the other embodiments. In particular, as for the system embodiment, since it is substantially similar to the method embodiment, the description is relatively simple, and reference may be made to the partial description of the method embodiment for relevant points. In the description herein, references to the description of the term "one embodiment," "some embodiments," "an example," "a specific example," or "some examples," etc., mean that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of an embodiment of the specification. In this specification, the schematic representations of the terms used above are not necessarily intended to refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples. Furthermore, various embodiments or examples and features of different embodiments or examples described in this specification can be combined and combined by one skilled in the art without contradiction.
The above description is only an example of the embodiments of the present disclosure, and is not intended to limit the embodiments of the present disclosure. Various modifications and variations to the embodiments described herein will be apparent to those skilled in the art. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the embodiments of the present specification should be included in the scope of the claims of the embodiments of the present specification.
Claims (8)
1. A thyristor converter valve assembly short circuit current test loop, comprising: the voltage applying module, the synthetic loop testing module and the short-circuit current testing module are respectively connected to the thyristor converter valve component;
the synthetic loop test module is used for controlling the thyristor converter valve component to be in a preset normal operation preheating working condition;
the synthetic loop test module is also used for acquiring voltage and current waveform information of the thyristor converter valve component when the short-circuit current test module applies short-circuit current to the thyristor converter valve component and the voltage application module applies voltage to the thyristor converter valve component;
the voltage applying module includes: the auxiliary module and the power frequency voltage generator are connected with each other; the auxiliary module is respectively connected with the synthetic loop test module and the thyristor converter valve assembly;
the auxiliary module includes: the auxiliary branch circuit is provided with two auxiliary thyristors which are arranged on the auxiliary branch circuit and are connected in parallel and have opposite arrangement directions; one end of the auxiliary branch circuit is connected with the power frequency voltage generator, and the other end of the auxiliary branch circuit is connected with the thyristor converter valve component;
the synthesis loop test module comprises: the thyristor converter valve component is determined as one bridge arm of a six-pulse bridge of the high-current source and is connected with the high-voltage source in parallel;
the high-voltage source is used for applying forward and reverse voltages to the thyristor converter valve component;
the high-current source is used for providing two pulsating currents for the thyristor converter valve component;
the short circuit current test module comprises: a power supply, a capacitor, an inductor and a thyristor valve; the power supply and the capacitor are connected in parallel to form a parallel branch, and the parallel branch is connected with the inductor and the thyristor valve in series; one end of the thyristor valve is connected with the inductor, and the other end of the thyristor valve is connected with the thyristor converter valve component.
2. The thyristor converter valve assembly short circuit current test circuit of claim 1, wherein the auxiliary module further comprises: and the switch is arranged at the other end of the auxiliary branch.
3. The thyristor converter valve assembly short circuit current test circuit of claim 1, wherein the thyristor converter valve assembly comprises: a resistor, a capacitor and a thyristor to be tested; the resistor and the capacitor are connected in series to form a series shunt circuit, and the series shunt circuit is connected with the thyristor to be tested in parallel.
4. The thyristor converter valve assembly short circuit current test circuit of claim 1, wherein the short circuit current test module comprises:
power supply, capacitor, inductor and thyristor valve; a parallel branch circuit is formed by connecting the power supply and the capacitor in parallel, and the parallel branch circuit is sequentially connected with the inductor and the thyristor valve in series; one end of the thyristor valve is connected with the inductor, and the other end of the thyristor valve is connected with the thyristor converter valve component.
5. The thyristor converter valve assembly short circuit current test circuit of claim 1, wherein the synthetic loop test module comprises: a voltage current generating circuit and a voltage current measuring part; and the two output ends of the voltage and current generating loop are respectively connected to the thyristor converter valve component.
6. The thyristor converter valve assembly short circuit current test circuit of claim 2, wherein the switch is an electric knife switch.
7. The thyristor converter valve assembly short circuit current test circuit of claim 1, wherein the thyristor converter valve assembly comprises: and the thyristors to be tested are connected in series.
8. The thyristor converter valve assembly short circuit current test circuit of claim 1, wherein the voltage application module and the resultant circuit test module are each grounded at one end.
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| CN114236267B (en) * | 2021-11-23 | 2024-01-30 | 西安西电电力系统有限公司 | Device for applying fault current based on high-capacity power electronic switch and test method |
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| CN100386639C (en) * | 2006-03-17 | 2008-05-07 | 中国电力科学研究院 | Single-pouring synthetic experimental method of high-voltage parallel crystal brake valve |
| CN101706541B (en) * | 2009-12-04 | 2012-12-26 | 中国电力科学研究院 | Detection device for fault current experiment of direct-current transmission converter valve |
| CN102012481B (en) * | 2010-10-12 | 2014-05-21 | 中国电力科学研究院 | Thyristor level test method for novel converter valve module |
| CN102486517B (en) * | 2010-12-01 | 2015-11-25 | 中国电力科学研究院 | The high voltage direct current transmission converter valve fault current testing method of surge voltage compound |
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| KR101326327B1 (en) * | 2012-05-22 | 2013-11-11 | 명지대학교 산학협력단 | Apparatus for testing thryristor valve |
| CN103048595B (en) * | 2012-12-13 | 2016-01-20 | 国网智能电网研究院 | A kind of thyristor opens stress test method and device |
| CN104977480B (en) * | 2014-04-02 | 2017-12-26 | 国家电网公司 | A kind of failure current test apparatus for high voltage DC transmission converter valve and its test method |
| CN105182222A (en) * | 2014-06-17 | 2015-12-23 | 国家电网公司 | Device and method for testing forward recovery characteristics of thyristor based on synthesis loop |
| CN106526446A (en) * | 2016-12-14 | 2017-03-22 | 云南电网有限责任公司电力科学研究院 | Testing circuit for thyristor level in high-voltage DC converter valve assembly |
| CN207424145U (en) * | 2017-11-27 | 2018-05-29 | 中国西电电气股份有限公司 | A kind of direct-current transmission converter valve short-circuit test system |
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