CN114895176A - Harmonic switching method for converter transformer vacuum on-load tap-changer - Google Patents
Harmonic switching method for converter transformer vacuum on-load tap-changer Download PDFInfo
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- G01R31/327—Testing of circuit interrupters, switches or circuit-breakers
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Abstract
The invention discloses a harmonic switching method of a converter transformer vacuum on-load tap-changer, which comprises the following steps: setting test parameters of a harmonic current on-off test according to the structural characteristics of the converter transformer vacuum on-load tap-changer; selecting harmonic components according to the frequency spectrum condition of the harmonic current of the converting application site, and designing a high-frequency harmonic operation mechanism; the switching on and off of the vacuum arc-extinguishing chamber are controlled by the high-frequency harmonic operating mechanism to carry out harmonic switching so as to verify the influence of the harmonic component on the switching-on and switching-off performance of the vacuum arc-extinguishing chamber when the test current value at the switching-on and switching-off moment is changed; according to the invention, the high-frequency harmonic operating mechanism is designed, so that whether the on-load tap-changer can bear harmonic current in a power grid system is effectively checked.
Description
Technical Field
The invention relates to the technical field of tap changers, in particular to a harmonic switching method of a converter transformer vacuum on-load tap changer.
Background
With the development of flexible direct current technology, the working condition of harmonic current switching of the on-load tap-changer is increasingly prominent, higher requirements are put forward on the reliability of the tap-changer, IEC and GB are established on the research basis of a conventional direct current system at present, and the requirements of a load switching test with harmonic current are not put forward.
Disclosure of Invention
This section is for the purpose of summarizing some aspects of embodiments of the invention and to briefly introduce some preferred embodiments. In this section, as well as in the abstract and the title of the invention of this application, simplifications or omissions may be made to avoid obscuring the purpose of the section, the abstract and the title, and such simplifications or omissions are not intended to limit the scope of the invention.
The present invention has been made in view of the above-mentioned conventional problems.
In order to solve the above technical problems, the present invention provides the following technical solutions, including: setting test parameters of a harmonic current on-off test according to the structural characteristics of the converter transformer vacuum on-load tap-changer; selecting harmonic components according to the frequency spectrum condition of the harmonic current of the converting application site, and designing a high-frequency harmonic operation mechanism; the switching-on and switching-off of the vacuum arc-extinguishing chamber are controlled by the high-frequency harmonic operating mechanism to carry out harmonic switching so as to verify the influence of the harmonic component on the switching-on and switching-off performance of the vacuum arc-extinguishing chamber when the test current value at the switching-on and switching-off moment is changed.
As a preferable scheme of the harmonic switching method of the converter transformer vacuum on-load tap-changer, the method comprises the following steps: the test parameters comprise test voltage, test current, test times and test current value at the on-off moment.
As a preferred scheme of the harmonic switching method of the converter transformer vacuum on-load tap changer, the method comprises the following steps: the test voltages included:
U＝U L +R×I L
wherein U is a test voltage, U L Is a step voltage, R is an excess resistance, I L Is the load current.
As a preferable scheme of the harmonic switching method of the converter transformer vacuum on-load tap-changer, the method comprises the following steps: the test current includes:
I＝0.5×(I L +U L /R)
wherein I is a test current.
As a preferred scheme of the harmonic switching method of the converter transformer vacuum on-load tap changer, the method comprises the following steps: the harmonic components include: and 5 th harmonic current and 7 th harmonic current are superposed, and the amplitude ranges of the 5 th harmonic current and the 7 th harmonic current are adjustable within 0-230A.
As a preferable scheme of the harmonic switching method of the converter transformer vacuum on-load tap-changer, the method comprises the following steps: further comprising: the amplitude, frequency and phase angle superposed with the fundamental wave of the 5 th harmonic wave and 7 th harmonic wave are controlled to meet the requirement of the required test current.
As a preferable scheme of the harmonic switching method of the converter transformer vacuum on-load tap-changer, the method comprises the following steps: the method comprises the following steps: a power network test power supply or a short-circuit generator is used for switching through a high-frequency harmonic operation mechanism, a vacuum arc extinguish chamber is connected in series in a switching loop, and the power factor of the switching loop power supply is less than or equal to 0.15.
As a preferable scheme of the harmonic switching method of the converter transformer vacuum on-load tap-changer, the method comprises the following steps: the high-frequency harmonic operating mechanism comprises a harmonic current source, a fundamental wave power supply, an inverter and an isolation transformer; a 220V power electronic inverter is utilized to form a harmonic current source, and a bypass resistor is arranged beside the harmonic current source; injecting harmonic current through the isolation transformer; wherein, the transformation ratio of the isolation transformer is 1: 10 times, rated voltage of 7.56kV at the high-voltage side and 756V at the low-voltage side.
As a preferable scheme of the harmonic switching method of the converter transformer vacuum on-load tap-changer, the method comprises the following steps: the method comprises the following steps: when the vacuum arc extinguish chamber is switched on, the currents of the harmonic current source and the fundamental wave power source are superposed and flow through the vacuum arc extinguish chamber, and when the vacuum arc extinguish chamber is switched off, the test current flows through the parallel resistor.
The invention has the beneficial effects that: by designing the high-frequency harmonic operating mechanism, whether the on-load tap-changer can bear harmonic current in a power grid system is effectively checked.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings needed to be used in the description of the embodiments will be briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings based on these drawings without inventive exercise. Wherein:
fig. 1 is a schematic diagram of an on-load tap-changer topology switching test circuit of a harmonic switching method of a converter transformer vacuum on-load tap-changer according to a first embodiment of the present invention.
Detailed Description
In order to make the aforementioned objects, features and advantages of the present invention comprehensible, specific embodiments accompanied with figures are described in detail below, and it is apparent that the described embodiments are a part of the embodiments of the present invention, not all of the embodiments. All other embodiments, which can be obtained by a person skilled in the art without making creative efforts based on the embodiments of the present invention, shall fall within the protection scope of the present invention.
In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present invention, but the present invention may be practiced in other ways than those specifically described and will be readily apparent to those of ordinary skill in the art without departing from the spirit of the present invention, and therefore the present invention is not limited to the specific embodiments disclosed below.
Furthermore, reference herein to "one embodiment" or "an embodiment" means that a particular feature, structure, or characteristic described in connection with the embodiment is included in at least one implementation of the invention. The appearances of the phrase "in one embodiment" in various places in the specification are not necessarily all referring to the same embodiment, nor are separate or alternative embodiments mutually exclusive of other embodiments.
The present invention will be described in detail with reference to the drawings, wherein the cross-sectional views illustrating the structure of the device are not enlarged partially in general scale for convenience of illustration, and the drawings are only exemplary and should not be construed as limiting the scope of the present invention. In addition, the three-dimensional dimensions of length, width and depth should be included in the actual fabrication.
Meanwhile, in the description of the present invention, it should be noted that the terms "upper, lower, inner and outer" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are only for convenience of describing the present invention and simplifying the description, but do not indicate or imply that the referred device or element must have a specific orientation, be constructed in a specific orientation and operate, and thus, cannot be construed as limiting the present invention. Furthermore, the terms first, second, or third are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.
The terms "mounted, connected and connected" in the present invention are to be understood broadly, unless otherwise explicitly specified or limited, for example: can be fixedly connected, detachably connected or integrally connected; they may be mechanically, electrically, or directly connected, or indirectly connected through intervening media, or may be interconnected between two elements. The specific meanings of the above terms in the present invention can be understood in specific cases to those skilled in the art.
Example 1
The embodiment provides a harmonic switching method of a converter transformer vacuum on-load tap-changer, which comprises the following steps:
s1: and setting test parameters of a harmonic current on-off test according to the structural characteristics of the converter transformer vacuum on-load tap-changer.
According to the structural characteristics of the converter transformer vacuum on-load tap-changer, key parameters such as transfer on-off current, power frequency recovery voltage, transfer on-off current, on-off voltage and the like are mainly included in the switching process, the situation that the current required to be switched on and off by a vacuum arc-extinguishing chamber in the switching process of the on-load tap-changer is the superposition of rated load current and circulating current in the conversion process is the severest situation, and the situation that the on-off voltage required to be born by the vacuum arc-extinguishing chamber in the switching process of the on-load tap-changer and the recovery voltage after being switched off are the superposition of stage voltage and voltage at two ends of a transition resistor is the severest situation; specifically, test parameters (test voltage, test current, test frequency and test current value at the time of switching on and off) of the harmonic current switching-on test are set:
wherein, (1) test voltage:
U＝U L +R×I L
wherein U is a test voltage, U L Is a step voltage, R is an excess resistance, I L Is the load current.
(2) Test current:
I＝0.5×(I L +U L /R)
wherein I is a test current.
The required test parameters are the verification of the harmonic current switching capability of the vacuum on-load tap-changer under the most severe working conditions.
S2: and selecting harmonic components according to the frequency spectrum condition of the harmonic current of the converting application site, and designing a high-frequency harmonic operation mechanism.
According to the situation of a harmonic current spectrum of a converter application site, the amplitude of a harmonic component above 50 times is small, the typical harmonic content with the highest proportion is usually 5 times of harmonic and 7 times of harmonic, that is, the harmonic content selected in the embodiment, specifically, the harmonic content selected in the embodiment is as follows: and 5 th harmonic current and 7 th harmonic current are superposed, and the amplitude ranges of the 5 th harmonic current and the 7 th harmonic current are adjustable within 0-230A.
The amplitude, frequency and phase angle superposed with the fundamental wave of the 5 th harmonic wave and 7 th harmonic wave are controlled to meet the requirement of the required test current.
Further, designing a high-frequency harmonic operating mechanism, wherein the high-frequency harmonic operating mechanism comprises a harmonic current source, a fundamental wave power supply, an inverter and an isolation transformer;
specifically, (1) in the embodiment, a 220V power electronic inverter is used to form a harmonic current source, and a bypass resistor is arranged beside the harmonic current source; the harmonic current source may output a 5 th harmonic current of amplitude 223A and a 7 th harmonic current of amplitude 133A (other amplitudes may be adjusted as well).
(2) Injecting harmonic current through an isolation transformer in a boosting way; wherein, the transformation ratio of the isolation transformer is 1: 10 times, rated voltage of 7.56kV at the high-voltage side and 756V at the low-voltage side.
(3) The inverter adopts IGBT to constitute single-phase H bridge circuit.
The two ends of the vacuum arc extinguish chamber are connected with a resistor in parallel to serve as follow current, when the vacuum arc extinguish chamber is disconnected, follow current flows through the resistor, the resistance value of the resistor is selected to enable the follow current to flow through the resistor, and the voltage drop of the resistor does not exceed the voltage of a high-voltage bus.
When the vacuum arc extinguish chamber is switched on, the currents of the harmonic current source and the fundamental wave power source are superposed and flow through the vacuum arc extinguish chamber, and when the vacuum arc extinguish chamber is switched off, the test current flows through the parallel resistor.
Preferably, when the impedance of the fundamental power supply is not less than the parallel resistance value, the requirement of the harmonic wave non-backward flow power grid can be met no matter whether the vacuum arc-extinguishing chamber is closed or not.
S3: the switching-on and switching-off of the vacuum arc-extinguishing chamber are controlled by the high-frequency harmonic operating mechanism to carry out harmonic switching so as to verify the influence of the harmonic component on the switching-on and switching-off performance of the vacuum arc-extinguishing chamber when the test current value at the switching-on and switching-off moment is changed.
A power network test power supply or a short-circuit generator is used for switching through a high-frequency harmonic operation mechanism, a vacuum arc extinguish chamber is connected in series in a switching loop, and the power factor of the switching loop power supply is less than or equal to 0.15.
Example 2
In order to verify and explain the technical effect adopted in the method, the embodiment selects the method to perform a harmonic switching test to verify the real effect of the method.
Setting test parameters of a harmonic current cut-off test:
test voltage: 7560V; test current: 1718A; the test times are as follows: 3000 times; test current value at the time of opening/closing: 3A/us.
In this embodiment, a typical on-load tap-changer topology is taken as an example, when V1 is tested, in fig. 1, X represents a connection that needs to be disconnected, R is an external resistor, R1 and R2 are resistors, R1 needs to be shorted, N is time, A, B is a loop switch, V1 and V2 are test power supplies, T1 and T2 are places where vacuum arc-extinguishing chambers are placed, C is a high-frequency harmonic operating mechanism, and switching results are shown in table 1.
Table 1: and switching the result.
| Number of tests | Transfer current half cycle | |
| 0 time | 112ms | 15.73A/us |
| 1000 times (one time) | 127ms | 12.1A/us |
| 2000 times | 263ms | 7.6A/us |
| 3000 times (twice) | 480ms | 1.2A/us |
Therefore, the half cycle of the transfer current is obviously increased, the zero crossing point gradient is reduced, and the requirement of a load switching test is met.
It should be recognized that embodiments of the present invention can be realized and implemented by computer hardware, a combination of hardware and software, or by computer instructions stored in a non-transitory computer readable memory. The methods may be implemented in a computer program using standard programming techniques, including a non-transitory computer-readable storage medium configured with the computer program, where the storage medium so configured causes a computer to operate in a specific and predefined manner according to the methods and figures described in the detailed description. Each program may be implemented in a high level procedural or object oriented programming language to communicate with a computer system. However, the program(s) can be implemented in assembly or machine language, if desired. In any case, the language may be a compiled or interpreted language. Furthermore, the program can be run on a programmed application specific integrated circuit for this purpose.
Further, the operations of processes described herein can be performed in any suitable order unless otherwise indicated herein or otherwise clearly contradicted by context. The processes described herein (or variations and/or combinations thereof) may be performed under the control of one or more computer systems configured with executable instructions, and may be implemented as code (e.g., executable instructions, one or more computer programs, or one or more applications) collectively executed on one or more processors, by hardware, or combinations thereof. The computer program includes a plurality of instructions executable by one or more processors.
Further, the method may be implemented in any type of computing platform operatively connected to a suitable interface, including but not limited to a personal computer, mini computer, mainframe, workstation, networked or distributed computing environment, separate or integrated computer platform, or in communication with a charged particle tool or other imaging device, and the like. Aspects of the invention may be embodied in machine-readable code stored on a non-transitory storage medium or device, whether removable or integrated into a computing platform, such as a hard disk, optically read and/or write storage medium, RAM, ROM, or the like, such that it may be read by a programmable computer, which when read by the storage medium or device, is operative to configure and operate the computer to perform the procedures described herein. Further, the machine-readable code, or portions thereof, may be transmitted over a wired or wireless network. The invention described herein includes these and other different types of non-transitory computer-readable storage media when such media include instructions or programs that implement the steps described above in conjunction with a microprocessor or other data processor. The invention also includes the computer itself when programmed according to the methods and techniques described herein. A computer program can be applied to input data to perform the functions described herein to transform the input data to generate output data that is stored to non-volatile memory. The output information may also be applied to one or more output devices, such as a display. In a preferred embodiment of the invention, the transformed data represents physical and tangible objects, including particular visual depictions of physical and tangible objects produced on a display.
As used in this application, the terms "component," "module," "system," and the like are intended to refer to a computer-related entity, either hardware, firmware, a combination of hardware and software, or software in execution. For example, a component may be, but is not limited to being: a process running on a processor, an object, an executable, a thread of execution, a program, and/or a computer. By way of example, both an application running on a computing device and the computing device can be a component. One or more components can reside within a process and/or thread of execution and a component can be localized on one computer and/or distributed between two or more computers. In addition, these components can execute from various computer readable media having various data structures thereon. The components may communicate by way of local and/or remote processes such as in accordance with a signal having one or more data packets (e.g., data from one component interacting with another component in a local system, distributed system, and/or across a network such as the internet with other systems by way of the signal).
It should be noted that the above-mentioned embodiments are only for illustrating the technical solutions of the present invention and not for limiting, and although the present invention has been described in detail with reference to the preferred embodiments, it should be understood by those skilled in the art that modifications or equivalent substitutions may be made on the technical solutions of the present invention without departing from the spirit and scope of the technical solutions of the present invention, which should be covered by the claims of the present invention.
Claims (9)
1. A harmonic switching method of a converter transformer vacuum on-load tap-changer is characterized by comprising the following steps:
setting test parameters of a harmonic current on-off test according to the structural characteristics of the converter transformer vacuum on-load tap-changer;
selecting harmonic components according to the frequency spectrum condition of the harmonic current of the converting application site, and designing a high-frequency harmonic operation mechanism;
the switching-on and switching-off of the vacuum arc-extinguishing chamber are controlled by the high-frequency harmonic operating mechanism to carry out harmonic switching so as to verify the influence of the harmonic component on the switching-on and switching-off performance of the vacuum arc-extinguishing chamber when the test current value at the switching-on and switching-off moment is changed.
2. The harmonic switching method of a converter transformer vacuum on-load tap changer according to claim 1, characterized in that the test parameters comprise test voltage, test current, test times and test current values at the moment of switching on and off.
3. The method for harmonic switching in a converter transformer vacuum on-load tap changer of claim 2, wherein the test voltage comprises:
U＝U L +R×I L
wherein U is a test voltage, U L Is a step voltage, R is an excess resistance, I L Is the load current.
4. The method for harmonic switching in a converter transformer vacuum on-load tap changer of claim 3, wherein the test current comprises:
I＝0.5×(I L +U L /R)
wherein I is a test current.
5. The method for harmonic switching in a converter transformer vacuum on-load tap changer according to claim 3 or 4, characterized in that the harmonic components comprise:
and 5-order and 7-order harmonic currents are superposed, and the amplitude ranges of the 5-order and 7-order harmonic currents are adjustable within 0-230A.
6. The harmonic switching method of a converter transformer vacuum on-load tap changer of claim 5, further comprising:
the amplitude, frequency and phase angle superposed with the fundamental wave of the 5 th harmonic wave and 7 th harmonic wave are controlled to meet the requirement of the required test current.
7. The method for harmonic switching in a converter transformer vacuum on-load tap changer of claim 6, comprising:
a power network test power supply or a short-circuit generator is used for switching through a high-frequency harmonic operation mechanism, a vacuum arc extinguish chamber is connected in series in a switching loop, and the power factor of the switching loop power supply is less than or equal to 0.15.
8. The method for switching harmonics of a converter transformer vacuum on-load tap changer according to claim 6 or 7, characterized in that the high frequency harmonic operation means comprises a harmonic current source, a fundamental power source, an inverter and an isolation transformer;
a 220V power electronic inverter is utilized to form a harmonic current source, and a bypass resistor is arranged beside the harmonic current source;
injecting harmonic current through the isolation transformer; wherein, the transformation ratio of the isolation transformer is 1: 10 times, rated voltage of 7.56kV at the high-voltage side and 756V at the low-voltage side.
9. The method for harmonic switching in a converter transformer vacuum on-load tap changer of claim 8, comprising:
when the vacuum arc extinguish chamber is switched on, the currents of the harmonic current source and the fundamental wave power source are superposed and flow through the vacuum arc extinguish chamber, and when the vacuum arc extinguish chamber is switched off, the test current flows through the parallel resistor.
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115902609A (en) * | 2022-11-18 | 2023-04-04 | 上海交通大学 | Overvoltage experiment method and device based on harmonic current source |
| CN116593879A (en) * | 2023-03-31 | 2023-08-15 | 上海交通大学 | Method for detecting assembly precision of finished product of on-load tap-changer |
| WO2023231272A1 (en) * | 2022-06-02 | 2023-12-07 | 中国南方电网有限责任公司超高压输电公司检修试验中心 | Method and apparatus for realizing boosting-and-injection-type harmonic current source |
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2022
- 2022-03-31 CN CN202210346369.2A patent/CN114895176A/en active Pending
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2023231272A1 (en) * | 2022-06-02 | 2023-12-07 | 中国南方电网有限责任公司超高压输电公司检修试验中心 | Method and apparatus for realizing boosting-and-injection-type harmonic current source |
| CN115902609A (en) * | 2022-11-18 | 2023-04-04 | 上海交通大学 | Overvoltage experiment method and device based on harmonic current source |
| CN116593879A (en) * | 2023-03-31 | 2023-08-15 | 上海交通大学 | Method for detecting assembly precision of finished product of on-load tap-changer |
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