CN115774157A - Low-frequency power transmission converter valve test system and test method thereof - Google Patents
Low-frequency power transmission converter valve test system and test method thereof Download PDFInfo
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- CN115774157A CN115774157A CN202111042973.8A CN202111042973A CN115774157A CN 115774157 A CN115774157 A CN 115774157A CN 202111042973 A CN202111042973 A CN 202111042973A CN 115774157 A CN115774157 A CN 115774157A
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Abstract
The application provides a low-frequency power transmission converter valve test system and a test method thereof. The low-frequency power transmission converter valve test system comprises a mixing power supply branch and a test valve tower branch, wherein the voltage output by the mixing power supply branch comprises at least more than two frequencies which are marked as a first frequency alternating current power supply and a second frequency alternating current power supply, and the first frequency alternating current power supply is not equal to the second frequency alternating current power supply; the test valve tower branch comprises N test valve sections, and each test valve section comprises M power sub-modules; m and N are both natural numbers greater than or equal to 1. All the test valve sections are connected in series or in parallel to form a test valve tower branch, and the branch is connected with a first frequency alternating current power supply, a second frequency alternating current power supply and a reactor branch in series to form a test circuit. The voltage and current information of the test valve tower branch circuit is sampled, the voltage and current phases of the first frequency and the second frequency are controlled, the power operation requirement of the test valve tower branch circuit is met, and the electrified test requirement of the low-frequency power transmission converter valve in the production and manufacturing process is met.
Description
Technical Field
The application relates to the technical field of power electronic application, in particular to a low-frequency power transmission converter valve test system and a test method thereof.
Background
When the traditional power frequency transmission system adopts 50/60Hz, compared with a direct current power supply system, the transmission distance is limited, and the problems of system reactive power and distribution parameters need to be considered. Although the popularization of a direct current power supply system has considerable advantages in the fields of new energy application and electric energy transmission, equipment such as a direct current breaker and a direct current transformer is high in cost, and most direct current systems need to be newly built.
Therefore, for some situations that the transmission distance is far relative to that of a power frequency transmission system, but the cost requirement is limited, or equipment needs to be transformed and operated, a low-frequency transmission system can be adopted.
The low-frequency power transmission system can reduce the power transmission frequency, and is favorable for improving the problems of system reactive power and distributed parameters, thereby realizing certain long-distance power transmission. Meanwhile, the power frequency line of the power transmission line can still be reserved, so that the transformation cost is lower than that of a direct current power supply system.
However, the low-frequency power transmission system is used for power frequency and low-frequency voltage conversion without leaving an AC-AC converter. A more sophisticated ac-ac converter is a modular multilevel matrix converter (M3C).
The number of the bridge arms of the modular multilevel matrix converter is large, and experimental test verification is needed in the production and manufacturing processes. Generally, for large power electronic equipment, module-level or valve segment-level tests are mostly adopted. However, the bridge arm current of the M3C converter is superposed current of two frequencies, and experimental verification is carried out, and the method is different from the prior MMC and SVG devices.
Therefore, a low-frequency power transmission converter valve test system and a test method thereof are needed to be provided, so that superimposed currents of at least two frequencies can be provided, the power operation requirement of a test valve tower branch is met, and the live test requirement of the low-frequency power transmission converter valve in the production and manufacturing process is met.
The above information disclosed in this background section is only for enhancement of understanding of the background of the application and therefore it may contain information that does not form the prior art that is already known to a person of ordinary skill in the art.
Disclosure of Invention
The application aims to provide a low-frequency power transmission converter valve test system and a test method thereof, which can provide superposed currents of at least two frequencies, realize the power operation requirement of a test valve tower branch and meet the electrified test requirement of the low-frequency power transmission converter valve in the production and manufacturing process.
According to an aspect of this application, provide a low frequency transmission converter valve test system, its characterized in that, low frequency transmission converter valve test system includes mixing power branch road and test valve tower branch road, mixing power branch road with test valve tower branch road parallel connection, wherein:
the voltage output by the mixing power supply branch circuit comprises at least alternating-current voltage with a first frequency and alternating-current voltage with a second frequency, and the first frequency is not equal to the second frequency;
the test valve tower branch comprises N test valve sections, and each test valve section comprises M power sub-modules; m and N are both natural numbers greater than or equal to 1.
According to some embodiments, the test valve tower branch further comprises a controller that controls the test valve section to output an alternating voltage that is a superposition of the alternating voltage of the first frequency and the alternating voltage of the second frequency.
According to some embodiments, the power sub-module is an ac-dc conversion sub-module, and includes an ac port and a dc port, and the ac ports of the power sub-module are sequentially connected in series.
According to some embodiments, the power sub-module is a full-bridge module, comprising 4 fully-controlled power devices and a capacitor:
the direct current ports of the power sub-modules are formed by nodes connected in parallel of the fully-controlled power devices which are connected in series pairwise;
the capacitor is connected in parallel to the direct current port of the power sub-module;
the midpoints of the fully-controlled power devices connected in series in pairs form the alternating current port of the power sub-module.
According to some embodiments, the mixing power branch comprises a first ac power source of the first frequency and a second ac power source of the second frequency.
According to some embodiments, the mixing power supply branch comprises a multi-winding transformer, Q rectifier bridges, Q full-bridge modules, and a controller, wherein Q is a natural number greater than or equal to 1; wherein:
the primary side of the multi-winding transformer is connected with an alternating current power grid, and the secondary side of the multi-winding transformer comprises Q windings;
the Q windings are respectively connected with the alternating current sides of the Q rectifier bridges, the direct current sides of the Q rectifier bridges are connected with the direct current ports of the full-bridge modules, and the alternating current ports of the Q full-bridge modules are cascaded to be used as output ports of the frequency mixing power supply branch circuit;
the controller controls the alternating current ports of the Q full-bridge modules to generate alternating current voltage which comprises the superposition of alternating current voltage with the first frequency and alternating current voltage with the second frequency.
According to some embodiments, the test system further comprises P reactor branches, P being a natural number greater than or equal to 1.
According to some embodiments, the reactor branch comprises a series reactor and a start-up branch;
the starting branch circuit comprises a starting resistor, a starting switch and a bypass switch.
According to some embodiments, a low frequency power transmission converter valve testing system as defined in any of the preceding claims:
the reactor branch comprises a first reactor branch, a second reactor branch, a No. 8230and a No. K reactor branch;
x1 test valve sections of the test valve tower branch are connected in series to form a first test valve tower branch; x2 test valve sections of the test valve tower branch are connected in series to form a second test valve tower branch \8230, xk test valve sections of the test valve tower branch are connected in series to form a kth test valve tower branch, wherein X1+ X2 \8230 ++ Xk = N, k = P, and N is larger than or equal to k;
the first reactor branch is connected with a first test valve tower branch in series, the second reactor branch is connected with a second test valve tower branch in series \8230and \8230, the kth reactor branch is connected with a kth test valve tower branch in series, and the branches connected in series are connected in parallel with the frequency mixing power supply branch after being connected in parallel.
According to one aspect of the application, a testing method of a low-frequency power transmission converter valve testing system is provided, and the method comprises the following steps:
if the frequency mixing power supply branch is realized by adopting a power electronic circuit, starting the frequency mixing power supply branch and outputting alternating-current voltage containing the first frequency and the second frequency;
closing the charging switch of the starting branch to complete charging of the test valve tower branch;
closing the bypass switch of the startup branch, unlocking the test valve tower branch by the controller of the test valve tower branch;
sampling the test valve tower branch current, and regulating the test valve tower branch voltage through the closed-loop control of the controller of the test valve tower branch, so that the series reactor of the test system and the test valve tower branch current reach a rated state.
The voltage and current information of the test valve tower branch circuit is sampled, the voltage and current phases of the first frequency and the second frequency are controlled, the power operation requirement of the test valve tower branch circuit is met, and the electrified test requirement of the low-frequency power transmission converter valve in the production and manufacturing process is met.
It is to be understood that both the foregoing general description and the following detailed description are exemplary and explanatory only and are not restrictive of the application.
Drawings
The above and other objects, features and advantages of the present application will become more apparent by describing in detail exemplary embodiments thereof with reference to the attached drawings. The drawings described below are for illustrative purposes only of certain embodiments of the present application and are not intended to limit the present application.
FIG. 1 illustrates a schematic diagram of a low frequency power transmission converter valve testing system of an exemplary embodiment;
FIG. 2 illustrates yet another embodiment of a schematic diagram of an exemplary low frequency power transmission converter valve testing system;
FIG. 3 illustrates yet another embodiment of a schematic diagram of an exemplary low frequency power transmission converter valve testing system;
FIG. 4 shows a circuit schematic of a full bridge module of an exemplary embodiment;
fig. 5 shows a flow chart of a testing method of the low frequency power transmission converter valve testing system of an exemplary embodiment.
Detailed Description
Example embodiments will now be described more fully with reference to the accompanying drawings. Example embodiments may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein; rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the concept of example embodiments to those skilled in the art. The same reference numerals denote the same or similar parts in the drawings, and thus, a repetitive description thereof will be omitted.
The described features, structures, or characteristics may be combined in any suitable manner in one or more embodiments. In the following description, numerous specific details are provided to give a thorough understanding of embodiments of the disclosure. One skilled in the relevant art will recognize, however, that the embodiments of the disclosure can be practiced without one or more of the specific details, or with other means, components, materials, devices, or the like. In such cases, well-known structures, methods, devices, implementations, materials, or operations will not be shown or described in detail.
The flow charts shown in the drawings are merely illustrative and do not necessarily include all of the contents and operations/steps, nor do they necessarily have to be performed in the order described. For example, some operations/steps may be decomposed, and some operations/steps may be combined or partially combined, so that the actual execution sequence may be changed according to the actual situation.
The terms "first," "second," and the like in the description and claims of the present application and in the foregoing drawings are used for distinguishing between different objects and not for describing a particular sequential order. Furthermore, the terms "include" and "have," as well as any variations thereof, are intended to cover non-exclusive inclusions. For example, a process, method, system, article, or apparatus that comprises a list of steps or elements is not limited to only those steps or elements listed, but may alternatively include other steps or elements not listed, or inherent to such process, method, article, or apparatus.
It will be appreciated by those skilled in the art that the drawings are merely schematic representations of exemplary embodiments, and that the blocks or processes shown in the drawings are not necessarily required to practice the present application and are, therefore, not intended to limit the scope of the present application.
Embodiments of apparatus of the present application are described below that may be used to perform embodiments of the methods of the present application. For details not disclosed in the embodiments of the apparatus of the present application, reference is made to the embodiments of the method of the present application.
Fig. 1 shows a schematic diagram of a low frequency power transmission converter valve testing system of an exemplary embodiment.
As shown in FIG. 1, the low-frequency power transmission converter valve testing system comprises a mixing power supply branch 101, reactor branches 1021-102P and testing valve tower branches 1031-103P.
According to an exemplary embodiment, the mixing power branch 101 includes an ac power source 101a and an ac power source 101b connected in series, the ac power source 101a having a first frequency ac power source F1, and the ac power source 101b having a second frequency ac power source F2.
According to some embodiments, the voltage output by the mixing power branch includes at least two frequencies, which are denoted as a first frequency ac power source F1 and a second frequency ac power source F2, and the first frequency ac power source F1 is not equal to the second frequency ac power source F2.
According to an exemplary embodiment, the test valve tower branch further includes a controller 104 that can control all test valve sections to output ac voltages with a frequency superimposed by the first frequency ac power source F1 and the second frequency ac power source F2.
According to some embodiments, the test valve tower branch comprises N test valve sections, the test valve sections comprise M power sub-modules, and M and N are both natural numbers greater than or equal to 1. Referring to fig. 1, the power sub-modules are 10311-1031M, \8230;, 103P1-103PM.
According to some embodiments, the power sub-module is an ac-dc sub-module and comprises an ac port and a dc port, and a plurality of sub-modules are connected in series in sequence through the ac port to form a test valve segment. Referring to fig. 1, power sub-modules 10311-1031M are connected in series to form a test valve tower branch 1031, power sub-modules 10321-1032M are connected in series to form a test valve tower branch 1032, and power sub-modules 103P1-103PM are connected in series to form a test valve tower branch 103P.
According to example embodiments, the number of test valve stages N may be equal to or greater than the number of test valve tower branches P, which is equal to the number of reactor branches.
According to some embodiments, when the number N of the test valve sections is larger than or equal to k, and the number P = k of the test valve tower branches, the reactor branch comprises a first reactor branch, a second reactor branch, 8230, and a kth reactor branch.
According to some embodiments, X1 test valve sections of the test valve tower leg are connected in series forming a first test valve tower leg; x2 test valve sections of the test valve tower branch are connected in series to form a second test valve tower branch, wherein the test valve tower branch is '8230' \ '8230'; x1+ X2 \8230; + Xk = N.
According to some embodiments, a first reactor branch is connected in series with a first test valve tower branch, a second reactor branch is connected in series with a second test valve tower branch \8230, the kth reactor branch is connected in series with a kth test valve tower branch; the branches connected in series are connected in parallel and then connected in parallel with the mixing power supply branch.
Fig. 2 illustrates yet another embodiment of a schematic diagram of an exemplary low frequency power transmission converter valve testing system.
As shown in fig. 2, the function of the mixing power supply branch 201 is implemented by a power electronic circuit. The power electronic circuit comprises a multi-winding transformer 201c, wherein the multi-winding transformer 201c comprises a primary winding 201c0, Q secondary windings 201c1-201cQ, Q rectifier bridges 201a1-201aQ, and Q full-bridge modules 201b1-201bQ.
As shown in fig. 2, the low-frequency power transmission converter valve testing system includes a mixing power supply branch 201, an alternating current power grid 202, a reactor branch 204, a testing valve tower branch 205, and a controller 206.
According to an example embodiment, the reactor branch 204 includes a series reactor 204a and a start-up branch, which includes a bypass switch 204b, a start-up switch 204c, and a start-up resistor 204d. Wherein the start-up switch 204c and the start-up resistor 204d are connected in series and then connected in series with the bypass switch 204 b.
According to an exemplary embodiment, the ac power grid 202 is connected to the primary winding 201c0, the Q secondary windings 201c1-201cQ are sequentially connected to the Q rectifier bridges 201a1-201aq, the Q rectifier bridges 201a1-201aQ are sequentially connected to the Q full bridge modules 201b1-201abq, and the Q full bridge modules 201b1-201bQ are sequentially connected in series and then connected in parallel to the test valve tower branch 205.
According to an exemplary embodiment, the reactor leg 204 is connected in series in a parallel leg on one side of the full-bridge modules 201b1-201bQ and the test valve tower leg 205.
According to an exemplary embodiment, the controller 206 controls the mixing power branch 204 to output an ac voltage comprising frequencies of the first frequency ac power source F1 and the second frequency ac power source F2.
According to an exemplary embodiment, the reactor branch has only one reactor branch, and all test valve sections of the test valve tower branch 205 are connected in series to form the test valve tower branch 205; the reactor branch 204, the test valve tower branch 205 and the mixing power supply branch 201 are connected in series end to form a test system.
Fig. 3 illustrates yet another embodiment of a schematic diagram of an exemplary low frequency power transmission converter valve testing system.
The circuit shown in fig. 3 is substantially the same as the circuit shown in fig. 2, except that: the reactor branch comprises a first reactor branch and a second reactor branch. The number N of the test valve sections is more than or equal to 2, P =2.
According to an example embodiment, X1 test valve sections of a test valve tower branch are connected in series to form a first test valve tower branch; the other X2 test valve sections are connected in series to form a second test valve tower branch; x1+ X2= N.
According to an example embodiment, the first reactor branch is connected in series with the first test valve tower branch, and the second reactor branch is connected in series with the second test valve tower branch; the branches connected in series are connected in parallel and then connected in parallel with the mixing power supply branch.
Fig. 4 shows a circuit schematic of a full bridge module of an exemplary embodiment.
As shown in fig. 4, the power sub-module is a full-bridge module, and includes 4 full-control power devices connected in series two by two and 1 capacitor; after the fully-controlled power devices connected in series in pairs are connected in parallel, the connected nodes form a direct current port of the power sub-module. The capacitor is connected in parallel with a direct current port of the power sub-module; the midpoints of the fully-controlled power devices connected in series in pairs are led out to form an alternating current port of the power sub-module.
According to some embodiments, the controller controls the test valve tower voltage by controlling the power device to be turned on and off, indirectly controls the whole loop current, or directly controls the current voltage to be automatically adapted.
Fig. 5 shows a flow chart of a testing method of the low frequency power transmission converter valve testing system of an exemplary embodiment.
In S11, if the mixing power supply branch is implemented by using a power electronic circuit, starting the mixing power supply branch, and outputting an ac voltage including an ac power supply F1 with a first frequency and an ac power supply F2 with a second frequency; otherwise, this step is skipped.
According to an example embodiment, if the circuit structure of the low-frequency power transmission converter valve test system is as shown in fig. 2, that is, the mixing power supply branch is implemented by using a power electronic circuit, the mixing power supply branch is started by a controller, and an alternating current voltage containing an alternating current power supply F1 with a first frequency and an alternating current power supply F2 with a second frequency is output.
According to an example embodiment, if the circuit structure of the low-frequency power transmission converter valve test system is as shown in fig. 1, that is, the mixing power supply branch is directly implemented by serially connecting ac power supplies with different frequencies, S11 is directly skipped, and S12 is switched to.
And S12, closing the charging switch of the starting branch to finish charging the test valve tower branch.
According to an example embodiment, a charge switch in the reactor branch is closed to charge a capacitor in a power sub-module in the test valve tower branch.
And S13, closing the bypass switch of the starting branch, and unlocking the test valve tower branch through the controller of the test valve tower branch.
According to an example embodiment, after the capacitor in the power sub-module in the test valve tower branch is charged, the bypass switch in the reactor branch is closed, and the fully-controlled power device in the power sub-module in the test valve tower branch is unlocked through the controller of the test valve tower branch.
And S14, sampling the current of the test valve tower branch, and regulating the voltage of the test valve tower branch through closed-loop control of a controller of the test valve tower branch, so that the current of a series reactor of the test system and the test valve tower branch reach a rated state.
According to the embodiment, the current of the branch circuit of the test valve tower is sampled, the voltage of the branch circuit of the test valve tower is adjusted through the closed-loop control of the controller of the branch circuit of the test valve tower, and therefore the current of the series reactor of the test system and the current of the branch circuit of the test valve tower reach the rated state. If the current reaches a rated state, indicating that the power sub-module in the branch of the test valve tower works normally; otherwise, it indicates that the power sub-module has a fault.
It should be clearly understood that this application describes how to make and use particular examples, but the application is not limited to any details of these examples. Rather, these principles can be applied to many other embodiments based on the teachings of the present disclosure.
Furthermore, it should be noted that the above-mentioned figures are only schematic illustrations of the processes involved in the method according to exemplary embodiments of the present application, and are not intended to be limiting. It will be readily understood that the processes shown in the above figures are not intended to indicate or limit the chronological order of the processes. In addition, it is also readily understood that these processes may be performed synchronously or asynchronously, e.g., in multiple modules.
Exemplary embodiments of the present application are specifically illustrated and described above. It is to be understood that the application is not limited to the details of construction, arrangement, or method of implementation described herein; on the contrary, the intention is to cover various modifications and equivalent arrangements included within the spirit and scope of the appended claims.
Claims (10)
1. The utility model provides a low frequency transmission converter valve test system, which characterized in that, low frequency transmission converter valve test system includes mixing power branch road and test valve tower branch road, mixing power branch road with test valve tower branch road parallel connection, wherein:
the voltage output by the mixing power supply branch comprises at least alternating-current voltage with a first frequency and alternating-current voltage with a second frequency, and the first frequency is not equal to the second frequency;
the test valve tower branch comprises N test valve sections, and each test valve section comprises M power sub-modules; m and N are both natural numbers greater than or equal to 1.
2. The low frequency power transmission converter valve test system of claim 1, wherein the test valve tower branch further comprises a controller that controls the test valve section to output an alternating voltage that is a superposition of the alternating voltage of the first frequency and the alternating voltage of the second frequency.
3. The low frequency power transmission converter valve test system according to claim 1, wherein the power sub-module is an ac-dc conversion sub-module, and comprises an ac port and a dc port, and the ac ports of the power sub-modules are sequentially connected in series.
4. The testing system of claim 3, wherein the power sub-module is a full-bridge module comprising 4 fully-controlled power devices and a capacitor:
the direct current ports of the power sub-modules are formed by nodes connected in parallel of the fully-controlled power devices which are connected in series pairwise;
the capacitor is connected in parallel to the direct current port of the power sub-module;
the midpoints of the fully-controlled power devices connected in series in pairs form the alternating current port of the power sub-module.
5. The testing system of claim 1, wherein the mixing power branch comprises a first ac power source at the first frequency and a second ac power source at the second frequency.
6. The testing system of claim 3, wherein the mixing power branch comprises a multi-winding transformer, Q rectifier bridges, Q full-bridge modules, and a controller, wherein Q is a natural number greater than or equal to 1; wherein:
the primary side of the multi-winding transformer is connected with an alternating current power grid, and the secondary side of the multi-winding transformer comprises Q windings;
the Q windings are respectively connected with the alternating current sides of the Q rectifier bridges, the direct current sides of the Q rectifier bridges are connected with the direct current ports of the full-bridge modules, and the alternating current ports of the Q full-bridge modules are cascaded to be used as output ports of the frequency mixing power supply branch circuit;
the controller controls the alternating current ports of the Q full-bridge modules to generate alternating current voltage which comprises the superposition of alternating current voltage with the first frequency and alternating current voltage with the second frequency.
7. The testing system of claim 2, further comprising P reactor legs, P being a natural number greater than or equal to 1.
8. The testing system of claim 7,
the reactor branch comprises a series reactor and a starting branch;
the starting branch circuit comprises a starting resistor, a starting switch and a bypass switch.
9. The low frequency power transmission converter valve testing system according to any one of claims 7-8, wherein:
the reactor branch comprises a first reactor branch, a second reactor branch, a No. 8230and a No. K reactor branch;
x1 test valve sections of the test valve tower branch are connected in series to form a first test valve tower branch; x2 test valve sections of the test valve tower branch are connected in series to form a second test valve tower branch \8230, xk test valve sections of the test valve tower branch are connected in series to form a kth test valve tower branch, wherein X1+ X2 \8230 ++ Xk = N, k = P, and N is larger than or equal to k;
the first reactor branch is connected with a first test valve tower branch in series, the second reactor branch is connected with a second test valve tower branch in series \8230and \8230, the kth reactor branch is connected with a kth test valve tower branch in series, and the branches connected in series are connected in parallel with the frequency mixing power supply branch after being connected in parallel.
10. A method of testing a low frequency power transmission converter valve testing system according to claim 8, comprising:
if the frequency mixing power supply branch is realized by adopting a power electronic circuit, starting the frequency mixing power supply branch and outputting alternating-current voltage containing the first frequency and the second frequency;
closing the charging switch of the starting branch to finish charging the test valve tower branch;
closing the bypass switch of the start-up branch and unlocking the test valve tower branch by the controller of the test valve tower branch;
sampling the test valve tower branch current, and regulating the test valve tower branch voltage through the closed-loop control of the controller of the test valve tower branch, so that the series reactor of the test system and the test valve tower branch current reach a rated state.
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|---|---|---|---|---|
| CN116699346A (en) * | 2023-08-08 | 2023-09-05 | 西安高压电器研究院股份有限公司 | Power frequency withstand voltage test loop and power frequency withstand voltage test method |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN116699346A (en) * | 2023-08-08 | 2023-09-05 | 西安高压电器研究院股份有限公司 | Power frequency withstand voltage test loop and power frequency withstand voltage test method |
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