Direct-current excitation test method and device for high-temperature superconducting synchronous phase modifier

Abstract

The invention relates to a direct-current excitation test method for a high-temperature superconducting synchronous phase modifier, which comprises the following steps of: connecting an adjustable direct-current power supply with a rotor coil of the high-temperature superconducting synchronous phase modifier to be tested, putting the rotor coil into a low-temperature container, and installing a magnetic field probe in a magnetic field area of the rotor coil; injecting a low-temperature medium into the low-temperature container to enable the rotor coil to reach a superconducting state; the adjustable direct-current power supply excites the rotor coil with gradually increased current until the rotor coil is quenched; and acquiring a voltage signal of the magnetic field probe and a voltage signal of the rotor coil, calculating the magnetic field intensity according to the voltage signal of the magnetic field probe, and recording the magnetic field intensity and the voltage of the rotor coil. According to the invention, the low-temperature condition of the actual use environment of the rotor coil can be simulated, the direct-current excitation test is continuously carried out through simple operation, and key performance tests of various synchronous phase modifiers such as rapid excitation test, excitation magnetic field test and critical current-carrying characteristic test are completed.

Description

Technical Field

[0001] The invention belongs to the technical field of superconducting motors, and in particular relates to a direct current excitation test method and equipment for a high-temperature superconducting synchronous condenser. Background Art

[0002] As a key device in modern power systems, the performance of high-temperature superconducting synchronous condensers directly affects the stability and efficiency of the system. In order to ensure the working performance of high-temperature superconducting synchronous condensers, after the rotor coils are manufactured, they need to be subjected to multiple rounds of low-temperature tests. The purpose of these tests is to comprehensively evaluate their performance parameters under extreme working conditions, including rapid excitation capability, excitation magnetic field strength, and critical current carrying capacity. Specifically, direct current excitation needs to be applied during the test to simulate the actual operating state, so as to measure the response characteristics of the rotor coils. However, traditional testing schemes not only require complex testing equipment, but also require a lot of time and human resources. At the same time, there are often problems such as cumbersome steps, low efficiency, and unstable test results, which are difficult to meet the precise testing requirements of high-temperature superconducting synchronous condensers. Therefore, there is an urgent need for a more concise and efficient testing scheme that can improve test efficiency and reduce operation complexity while ensuring test accuracy. In order to solve this technical problem, the present invention proposes a direct current excitation test method and equipment specifically for high-temperature superconducting synchronous condensers, aiming to comprehensively improve the quality and efficiency of multiple tests of rotor coils with efficient and reliable testing methods and equipment. Summary of the invention

[0003] One of the purposes of the present invention is to solve at least one or more of the above-mentioned problems existing in the prior art. In other words, one of the purposes of the present invention is to provide a DC excitation test method and equipment for a high-temperature superconducting synchronous phase shifter that meets one or more of the above-mentioned requirements.

[0004] In order to achieve the above-mentioned object of the invention, the present invention adopts the following technical solutions: In a first aspect, the present invention provides a method for testing a high temperature superconducting synchronous condenser using direct current excitation, the method comprising: Connecting an adjustable DC power supply to the rotor coil of the high-temperature superconducting synchronous condenser to be tested, placing the rotor coil in a low-temperature container, and installing a magnetic field probe in the magnetic field area of ​​the rotor coil; injecting a cryogenic medium into the cryogenic container to make the rotor coil reach a superconducting state; The adjustable DC power supply excites the rotor coil with a gradually increasing current until the rotor coil is quenched; the voltage signal of the magnetic field probe and the voltage signal of the rotor coil are obtained, the magnetic field strength is calculated according to the voltage signal of the magnetic field probe, and the magnetic field strength and the voltage of the rotor coil are recorded.

[0005] As a preferred embodiment, the method further comprises: A preset current limit, a first interval value and a second interval value, wherein the first interval value is greater than the second interval value, and when the gradually increasing current is less than the current limit, the magnetic field strength and the voltage of the rotor coil are recorded once each time the preset first interval value increases; when the gradually increasing current is greater than the current limit, the magnetic field strength and the voltage of the rotor coil are recorded once each time the preset second interval value increases.

[0006] As a preferred embodiment, the method further comprises: The current limit value is preset according to a critical current of the rotor coil at a specific temperature.

[0007] As a preferred embodiment, the method further comprises: When the rotor coil is out of overclocking, the rotor coil is demagnetized with a gradually decreasing current.

[0008] As a preferred embodiment, the method further comprises: The change of the current is suspended so that the adjustable DC power supply outputs a constant current.

[0009] As a preferred embodiment, the method further comprises: The current output of the adjustable DC power supply is turned off, the voltage signal of the magnetic field probe is obtained as the ambient magnetic field voltage, and the voltage signal of the magnetic field probe is corrected according to the ambient magnetic field voltage.

[0010] On the other hand, the present invention also provides a DC excitation test device for a high-temperature superconducting synchronous phase condenser, comprising a cryogenic container, an adjustable DC power supply, a magnetic field probe, a bias current source, and a control terminal; The low-temperature container is used to maintain the rotor coil at a superconducting temperature; the adjustable DC power supply is used to power the rotor coil; the magnetic field probe is configured to be installed in the magnetic field area of ​​the rotor coil; the bias current source provides a bias current for the magnetic field probe; the control end is electrically connected to the magnetic field probe and the rotor coil, and is used to receive the voltage signal of the magnetic field probe and the voltage signal of the rotor coil, and calculate the magnetic field strength according to the voltage signal of the magnetic field probe.

[0011] As a preferred implementation, the magnetic field probe is configured to be installed at the geometric center of the magnetic field area.

[0012] As a preferred implementation, the adjustable DC power supply is connected to the rotor coil via a conductive clamp.

[0013] As a preferred implementation, the adjustable DC power supply is a 0-240A adjustable DC power supply.

[0014] Compared with the prior art, the present invention has the following beneficial effects: The method and device of the present invention are applicable to synchronous condensers manufactured using second-generation high-temperature superconducting tapes, and can continuously perform DC excitation tests on the rotor coils of this type of synchronous condensers under low-temperature conditions simulating the actual use environment, and can complete various key performance tests of synchronous condensers such as rapid excitation test, excitation magnetic field test, critical current carrying characteristic test, etc. through simple operations. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 It is a structural schematic diagram of a DC excitation test device for a high-temperature superconducting synchronous phase regulator according to an embodiment of the present application.

[0016] Reference numerals: 1- rotor coil, 2- magnetic field probe, 3- adjustable DC power supply, 4- bias current source, 5- control terminal. DETAILED DESCRIPTION

[0017] The technical solutions in the embodiments of the present application will be clearly and completely described below in conjunction with the drawings in the embodiments of the present application.

[0018] The following description provides examples and does not limit the scope, applicability or examples set forth in the claims. Changes may be made to the functions and arrangements of the elements described without departing from the scope of the present application. Various processes or components may be appropriately omitted, substituted or added to each example. For example, the described method may be performed in an order different from the order described, and various steps may be added, omitted or combined. In addition, features described in some examples may be combined in other examples.

[0019] In order to facilitate the understanding of the present disclosure, an embodiment of a DC excitation test device for a high-temperature superconducting synchronous phase regulator provided by the present application is first introduced.

[0020] In one embodiment of the present application, Figure 1 As shown, a DC excitation test device for a high-temperature superconducting synchronous phase condenser is provided, including a low-temperature container, a DC power supply 3, a magnetic field probe 2, a bias current source 4, and a control terminal 5.

[0021] In this embodiment, an adjustable DC power supply 3 is used to power and excite the rotor coil 1 of the high-temperature superconducting synchronous condenser to be tested. The adjustable DC power supply 3 precisely controls the output of the power supply so that the rotor coil 1 generates a changing or stable magnetic field in real time according to the test requirements. Specifically, the adjustable DC power supply 3 uses a high-precision superconducting DC power supply 3. This design choice can significantly reduce the energy loss of the power supply during transmission, and through high-precision control, it is ensured that the rotor coil 1 can change the magnetic field strength in real time according to the test requirements, or stabilize the magnetic field strength at a certain size. The input and output ends of the power supply are connected to the input and output ends of the rotor coil 1 through an outer skin current line with excellent insulation performance to ensure that the current will not cause energy loss or safety hazards during transmission due to external interference. In this embodiment, the adjustable DC power supply 3 selects an output specification of 0-240A to meet the test requirements of the high-temperature superconducting synchronous condenser.

[0022] At the same time, in order to monitor the working state of the rotor coil 1 in real time, a voltage measuring line connected to the control terminal 5 is also provided at the input and output ends of the rotor coil 1 to send the voltage signal of the rotor coil 1 to the control terminal 5 .

[0023] In the magnetic field measurement part, the device of the present application adopts a magnetic field probe 2, which is precisely fixed in the area of ​​the magnetic field generated by the rotor coil 1. In particular, in the present embodiment, the magnetic field probe 2 is fixed at the geometric center of the magnetic field. Such an arrangement ensures that the magnetic field probe 2 can accurately capture the core changes of the magnetic field.

[0024] The magnetic field probe 2 is connected to the bias current source 4 through the power line of the magnetic field probe 2. The power line of the magnetic field probe 2 includes two leads, an input lead and an output lead, which are respectively connected to the output and input ends of the bias current source 4. The bias current source 4 inputs a constant bias current to the magnetic field probe 2. The bias current source 4 selects a 100mA constant current DC output power supply. When the current passes through the rotor coil 1, it excites it to generate a magnetic field, and the magnetic field probe 2 generates a potential difference corresponding to the strength and direction of the magnetic field, thereby causing the voltage at both ends of the magnetic field probe 2 to change. The voltage signal is transmitted to the control terminal 5 through two voltage measurement lines connected to the magnetic field probe 2.

[0025] In this embodiment, the control terminal 5 integrates wiring terminals, a voltage signal acquisition system, a central processing unit, a graphical programming interface and a display system, which can collect voltage signals and perform specified operations on the voltage signals, and record the operation results and display them through the display system.

[0026] The control terminal 5 obtains the voltage signal of the rotor coil 1 through the voltage measurement line connected to the rotor coil 1, and obtains the voltage signal of the magnetic field probe 2 through the voltage measurement line connected to the magnetic field probe 2. The control terminal 5 calculates the magnetic field strength at the position of the magnetic field probe 2 according to the voltage signal of the magnetic field probe 2, and accurately captures and records the changes in the magnetic field. During the excitation test, the control terminal 5 records the measurement data of the magnetic field strength and the voltage of the rotor coil 1 at a specified time, so as to perform a variety of key performance tests of the synchronous phase regulator such as rapid excitation test, excitation magnetic field test, critical current carrying characteristic test, etc. based on this measurement data.

[0027] In order to ensure that the excitation test of the high-temperature superconducting synchronous condenser is carried out normally, the rotor coil 1 needs to work under the temperature condition of reaching superconductivity. In this embodiment, the rotor coil 1 of the high-temperature superconducting synchronous condenser to be tested is placed in a low-temperature container, and the low-temperature container uses the low-temperature medium injected therein to cool the rotor coil 1 and maintain it at the superconducting temperature. In this embodiment, the low-temperature container uses a low-temperature liquid nitrogen box, and liquid nitrogen is filled inside. Liquid nitrogen can meet the temperature requirements of the rotor coil 1 to reach the superconducting state with higher economic benefits, and the outer wall of the low-temperature liquid nitrogen box has good thermal insulation performance, which can slow down the evaporation rate of liquid nitrogen.

[0028] In order to reduce the installation operations before the excitation test and improve the test efficiency, a wire clamp is set at the end of the current line of the adjustable DC power supply 3. By clamping the wire clamp at the inlet and outlet ends of the rotor coil 1, the connection between the adjustable DC power supply 3 and the rotor coil 1 can be quickly completed, which facilitates the replacement of the rotor coil 1 and allows continuous excitation testing of multiple rotor coils 1.

[0029] The DC excitation test equipment for high-temperature superconducting synchronous condenser provided in this embodiment can continuously perform DC excitation tests on the rotor coils of this type of synchronous condenser under low temperature conditions simulating the actual use environment, and complete various key performance tests of the synchronous condenser such as rapid excitation test, excitation magnetic field test, critical current carrying characteristic test, etc. through simple operation.

[0030] An embodiment of the present application provides a DC excitation test method for a high-temperature superconducting synchronous condenser, using Figure 1 The DC excitation test equipment for the high-temperature superconducting synchronous condenser shown is used to perform a DC excitation test on the high-temperature superconducting synchronous condenser.

[0031] In order to stabilize the cooling effect of the rotor coil 1 and facilitate the positioning of the magnetic field probe 2, this embodiment adopts the operation sequence of first installing the rotor coil 1 and the magnetic field probe 2 at the specified position inside the cryogenic container, and then injecting the cryogenic medium to cool it. Specifically, the method of this embodiment first connects the adjustable DC power supply 3 to the rotor coil 1, then ensures the connection status of the bias current source 4 and the magnetic field probe 2, and confirms that the control terminal 5 can receive the voltage signals of the rotor coil 1 and the magnetic field probe 2. The rotor coil 1 is placed in a cryogenic container, and then the magnetic field probe 2 is installed at the geometric center of the magnetic field area of ​​the rotor coil 1.

[0032] After placing the rotor coil 1 in the cryogenic container, ensure that the connection of the rotor coil 1 is firm and the power supply is stable, then inject liquid nitrogen into the cryogenic container to 10 cm above the surface of the rotor coil 1, so that the rotor coil 1 is completely immersed in the liquid nitrogen. When the liquid nitrogen is initially injected, the liquid nitrogen level will fluctuate or boil because the rotor coil 1 needs to be cooled. When the rotor coil 1 is close to being cooled, the liquid level returns to calm. When the temperature of the rotor coil 1 drops to the point where it enters the superconducting state, the pre-cooling step before the test is completed.

[0033] When the rotor coil 1 is precooled, the adjustable DC power supply 3 is turned on to excite the rotor coil 1, and the bias current source 4 is turned on to power the magnetic field probe 2. The excitation current output by the adjustable DC power supply 3 increases at a specified speed, and the rotor coil 1 generates a gradually increasing magnetic field as the current increases. The magnetic field probe 2 generates an induced voltage at both ends according to the magnetic field strength at its installation position. This induced voltage is sent to the control terminal 5 through the voltage measurement line connected to the two ends of the magnetic field probe 2. The control terminal 5 obtains the voltage at both ends of the magnetic field probe 2 through the voltage measurement line and further calculates the magnetic field strength and direction at the magnetic field probe 2.

[0034] According to the structure and connection relationship of the above equipment, the control end 5 can obtain and record the voltage at both ends of the rotor coil 1 and the magnetic field strength at the magnetic field probe 2. In the excitation test process of this embodiment, the excitation current output by the adjustable DC power supply 3 increases at a uniform rate of 0.05A per second, and the control end 5 records the voltage at both ends of the rotor coil 1 and the magnetic field strength at the magnetic field probe 2 once every 10A increase of the excitation current. According to the above current increase rate and the setting recorded by the control end 5, the control end 5 records the voltage at both ends of the rotor coil 1 and the magnetic field strength at the magnetic field probe 2 once every 200 seconds until the recorded magnetic field strength begins to decrease, that is, the rotor coil 1 is detected to be out of overload. When the rotor coil 1 is out of overload, the excitation current reaches the critical current, and the excitation current output by the adjustable DC power supply 3 decreases at a uniform rate of 0.05A per second, and the rotor coil 1 is demagnetized until the adjustable DC power supply 3 is turned off, and the rotor coil 1 is taken out from the low-temperature liquid nitrogen box, placed in a constant temperature box for drying, and the excitation experiment is terminated.

[0035] It can be understood that, in this embodiment, the rate of increase of the excitation current and the time interval recorded by the control terminal 5 can be arbitrarily set according to the actual needs of the excitation test, and are not limited to the parameters provided in the above examples.

[0036] In another embodiment of the present application, a current limit is also preset, and the recording interval of the control terminal 5 is set in segments according to the current limit. The current limit is set to a certain value less than the critical current of the rotor coil 1. When the excitation current is less than the current limit, the control terminal 5 records the voltage across the rotor coil 1 and the magnetic field strength at the magnetic field probe 2 at a larger interval, thereby reducing the operation of the excitation test and improving the test efficiency; when the excitation current is equal to or greater than the current limit, the control terminal 5 records the voltage across the rotor coil 1 and the magnetic field strength at the magnetic field probe 2 at a smaller interval, so that within a specified current range close to the critical current, the recording results of the voltage across the rotor coil 1 and the magnetic field strength at the magnetic field probe 2 are more accurate, thereby more accurately obtaining the excitation performance of the rotor coil 1 when the excitation current is close to the critical current.

[0037] Specifically, this embodiment obtains the critical current of the rotor coil 1 by modeling the rotor coil 1 and simulating the working temperature, and then sets the current limit value as 10A below the critical current. The excitation current increases at a uniform rate of 0.05A per second. When the excitation current is less than the current limit value, the control terminal 5 records the voltage across the rotor coil 1 and the magnetic field strength at the magnetic field probe 2 every 200 seconds; when the excitation current is equal to or greater than the current limit value, the control terminal 5 records the voltage across the rotor coil 1 and the magnetic field strength at the magnetic field probe 2 every 20 seconds.

[0038] The current limit value of this embodiment can be set multiple times according to the needs of the excitation test, and the preset current can be preset using different bases for each excitation test. For example, during the initial excitation test, the critical current of the rotor coil 1 can be simulated based on the modeling and operating temperature of the rotor coil 1, and 10A below the critical current is used as the preset current. A more accurate critical current is obtained based on the results of the initial excitation test, and the current limit value is set according to the more accurate critical current during the next excitation test, and combined with modifying the excitation current increase rate of the adjustable DC power supply 3, the excitation test can better obtain the excitation performance of the rotor coil 1 near the critical current.

[0039] Another embodiment of the present application also provides a method to pause the excitation test so that the excitation current output by the adjustable DC power supply 1 no longer increases or decreases, thereby maintaining the magnetic field generated by the rotor coil at a fixed intensity, and then demagnetizing or continuing to excite the rotor coil according to the test requirements.

[0040] In order to obtain more accurate excitation test results, another embodiment of the present application also provides a method to eliminate the interference of the environmental magnetic field on the excitation test. In this embodiment, the output of the adjustable DC power supply 3 is first turned off to ensure that the rotor coil 1 does not generate a magnetic field due to excitation, and then the voltage signal of the magnetic field probe 2 is obtained through the control terminal 5, and the voltage signal at this time is used as the environmental magnetic field voltage. In the subsequent excitation test process, the voltage signal of the magnetic field probe 2 obtained by the control terminal 5 is subtracted from the environmental magnetic field voltage, thereby eliminating the influence of the environmental magnetic field on the excitation test.

[0041] The above-mentioned environmental magnetic field voltage can also be directly measured from the voltage measurement line of the magnetic field probe 2 using a four-lead method.

[0042] The DC excitation test method for a high-temperature superconducting synchronous condenser provided in the above-mentioned embodiment can continuously perform DC excitation tests on the rotor coils of this type of synchronous condenser under low temperature conditions simulating the actual use environment, and complete various key performance tests of the synchronous condenser such as rapid excitation test, excitation magnetic field test, critical current carrying characteristic test, etc. through simple operations.

[0043] In the above embodiments, the description of each embodiment has its own emphasis. For parts that are not described in detail in a certain embodiment, reference can be made to the relevant descriptions of other embodiments.

[0044] Those of ordinary skill in the art will appreciate that the units and algorithm steps of each example described in conjunction with the embodiments disclosed herein can be implemented in electronic hardware, or a combination of computer software and electronic hardware. Whether these functions are performed in hardware or software depends on the specific application and design constraints of the technical solution. Professional and technical personnel can use different methods to implement the described functions for each specific application, but such implementation should not be considered to be beyond the scope of this application.

[0045] The above is only an exemplary embodiment of the present disclosure, and the scope of the present disclosure cannot be limited thereto. That is, any equivalent changes and modifications made according to the teachings of the present disclosure are still within the scope of the present disclosure. After considering the specification and practicing the disclosure here, those skilled in the art will easily think of the implementation scheme of the present disclosure. This application is intended to cover any modification, use or adaptation of the present disclosure, which follows the general principles of the present disclosure and includes common knowledge or customary technical means in the technical field not recorded in the present disclosure. The description and examples are regarded as exemplary only, and the scope and spirit of the present disclosure are defined by the claims.

Claims

1. A DC excitation test method for a high temperature superconducting synchronous condenser, characterized in that: include: Connecting an adjustable DC power supply to the rotor coil of the high-temperature superconducting synchronous condenser to be tested, placing the rotor coil in a low-temperature container, and installing a magnetic field probe in the magnetic field area of ​​the rotor coil; injecting a cryogenic medium into the cryogenic container to make the rotor coil reach a superconducting state; The adjustable DC power supply excites the rotor coil with a gradually increasing current until the rotor coil is quenched; the voltage signal of the magnetic field probe and the voltage signal of the rotor coil are obtained, the magnetic field strength is calculated according to the voltage signal of the magnetic field probe, and the magnetic field strength and the voltage of the rotor coil are recorded.

2. A DC excitation test method for a high temperature superconducting synchronous condenser according to claim 1, characterized in that: The method also includes: A preset current limit, a first interval value and a second interval value, wherein the first interval value is greater than the second interval value, and when the gradually increasing current is less than the current limit, the magnetic field strength and the voltage of the rotor coil are recorded once each time the preset first interval value increases; when the gradually increasing current is greater than the current limit, the magnetic field strength and the voltage of the rotor coil are recorded once each time the preset second interval value increases.

3. A DC excitation test method for a high temperature superconducting synchronous condenser as claimed in claim 2, characterized in that: The method also includes: The current limit value is preset according to a critical current of the rotor coil at a specific temperature.

4. A DC excitation test method for a high temperature superconducting synchronous condenser according to claim 1, characterized in that: The method also includes: When the rotor coil is out of overclocking, the rotor coil is demagnetized with a gradually decreasing current.

5. A DC excitation test method for a high temperature superconducting synchronous condenser according to claim 1 or 4, characterized in that: The method also includes: The change of the current is suspended so that the adjustable DC power supply outputs a constant current.

6. A DC excitation test method for a high temperature superconducting synchronous condenser according to claim 1, characterized in that: The method also includes: The current output of the adjustable DC power supply is turned off, the voltage signal of the magnetic field probe is obtained as the ambient magnetic field voltage, and the voltage signal of the magnetic field probe is corrected according to the ambient magnetic field voltage.

7. A DC excitation test device for a high-temperature superconducting synchronous condenser, characterized in that: It includes a low temperature container, an adjustable DC power supply, a magnetic field probe, a bias current source, and a control terminal; The low-temperature container is used to maintain the rotor coil at a superconducting temperature; the adjustable DC power supply is used to power the rotor coil; the magnetic field probe is configured to be installed in the magnetic field area of ​​the rotor coil; the bias current source provides a bias current for the magnetic field probe; the control end is electrically connected to the magnetic field probe and the rotor coil, and is used to receive the voltage signal of the magnetic field probe and the voltage signal of the rotor coil, and calculate the magnetic field strength according to the voltage signal of the magnetic field probe.

8. A DC excitation test device for a high temperature superconducting synchronous condenser as claimed in claim 7, characterized in that: The magnetic field probe is configured to be mounted at a geometric center of the magnetic field region.

9. A DC excitation test device for a high temperature superconducting synchronous condenser as claimed in claim 7, characterized in that: The adjustable DC power supply is provided with a conductive clamp, and the conductive clamp is used to clamp the connection terminal of the rotor coil to connect the adjustable DC power supply to the rotor coil.

10. A DC excitation test device for a high temperature superconducting synchronous condenser according to claim 7, characterized in that: The adjustable DC power supply is a 0-240A adjustable DC power supply.

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