WO2021169519A1 - Alimentation électrique monophasée, système de suppression d'arc et procédé de suppression d'arc - Google Patents

Alimentation électrique monophasée, système de suppression d'arc et procédé de suppression d'arc Download PDF

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Publication number
WO2021169519A1
WO2021169519A1 PCT/CN2020/137526 CN2020137526W WO2021169519A1 WO 2021169519 A1 WO2021169519 A1 WO 2021169519A1 CN 2020137526 W CN2020137526 W CN 2020137526W WO 2021169519 A1 WO2021169519 A1 WO 2021169519A1
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Prior art keywords
phase
power supply
phase power
generator
excitation
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PCT/CN2020/137526
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English (en)
Chinese (zh)
Inventor
芮骏
余银钢
孔德鹏
李磊
洪新春
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安徽一天电气技术股份有限公司
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Priority to CN202080005131.2A priority Critical patent/CN113169549A/zh
Publication of WO2021169519A1 publication Critical patent/WO2021169519A1/fr

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    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
    • H02H9/00—Emergency protective circuit arrangements for limiting excess current or voltage without disconnection
    • H02H9/08—Limitation or suppression of earth fault currents, e.g. Petersen coil
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02K—DYNAMO-ELECTRIC MACHINES
    • H02K19/00—Synchronous motors or generators
    • H02K19/16—Synchronous generators

Definitions

  • the invention relates to the field of electric power, in particular to a single-phase power supply, an arc extinguishing system and an arc extinguishing method.
  • Most domestic 6KV to 35KV distribution networks are neutral point ungrounded systems. According to statistics, more than 70% of the faults in the distribution network system are single-phase ground faults. In the case of a single-phase ground fault, the arc is difficult to extinguish, and it is easy to produce high-frequency overvoltage and power frequency overvoltage, which endanger the normal operation of the system. If the arc is difficult to extinguish for a long time, then a phase-to-phase short-circuit accident may also occur, leading to more serious consequences.
  • an arc suppression coil is usually connected to the neutral point of the distribution network to compensate the current at the ground fault point and eliminate the arc at the ground fault point.
  • the capacitive current to the ground of the distribution network system is increasing, and the absolute value of the resistive current, high-frequency current and harmonic current is also increasing. Since the above arc suppression coil can only compensate the power frequency capacitive current flowing through the ground fault point, it is difficult to effectively suppress the arc.
  • the related technology also adopts the transfer arc suppression technology, that is, the ground fault point is directly metal grounded through the selector switch on the bus side of the distribution network system to transfer the current at the ground fault point and eliminate the arc at the ground fault point.
  • the transfer arc suppression technology that is, the ground fault point is directly metal grounded through the selector switch on the bus side of the distribution network system to transfer the current at the ground fault point and eliminate the arc at the ground fault point.
  • the present invention provides a single-phase power supply, an arc suppression system and an arc suppression method.
  • a single-phase power supply includes: a three-phase asynchronous motor M, a single-phase synchronous generator G, and a three-phase excitation generator EX connected by a coupling, wherein the three-phase excitation generator EX follows the three-phase asynchronous motor M Rotate and generate three-phase alternating current, wherein the three-phase alternating current is rectified and supplied to the DC excitation winding of the single-phase synchronous generator G, and the single-phase synchronous generator G rotates following the three-phase asynchronous motor M and provides a single Phase power output.
  • the single-phase synchronous generator G includes a rotor assembly and a stator assembly, wherein the rotor assembly includes: a rotor core, the DC field winding, and a cage structure winding set at the slot position of the rotor core
  • the stator assembly includes: a stator core and a single-phase power output winding for providing the single-phase power output.
  • the cage structure winding is composed of a plurality of guide bars, and the number of the guide bars is the same as the number of slots of the rotor core.
  • the cross-sectional area of the conductive bar is the same as the winding cross-sectional area of the output winding of the single-phase power supply.
  • the air gap of the single-phase synchronous generator G is 1.2 to 1.8 times its rated air gap.
  • the single-phase synchronous generator G and the three-phase asynchronous motor M are integrally assembled and formed.
  • an arc suppression system includes: a grounding transformer, the first end of which is connected to the power distribution network, and the second end is grounded through the generator unit; a voltage sensor, which is connected to the power distribution network; and a measurement and control unit, which is connected to the voltage sensor and The generator unit is connected, and the measurement and control unit determines whether a ground fault occurs in the distribution network according to the voltage of the distribution network fed back by the voltage sensor, and, in the case of a ground fault, the measurement and control unit The unit controls the generator unit to adjust the amplitude and angle of the compensation voltage accordingly, wherein the generator unit is any single-phase power supply described above.
  • the above-mentioned arc suppression system further includes: a current sensor connected in series with the single-phase power supply for detecting the current of the single-phase power supply; and the measurement and control unit according to the current sensor feedback of the single-phase power supply Current, judging whether the ground fault of the distribution network is an instantaneous ground fault or a permanent ground fault.
  • an arc extinguishing method applied to any of the above arc extinguishing systems.
  • the arc suppression method includes: a single-phase power supply receives a control instruction from a measurement and control unit, wherein the control instruction is used to indicate a target amplitude and a target angle of the compensation voltage in the case of a ground fault in the distribution network; and the single-phase power supply The single-phase power output is adjusted to the target amplitude and the target angle.
  • the single-phase power supply adjusting its single-phase power output to the target amplitude and the target angle includes: according to the target amplitude, the single-phase power supply adjusts the excitation current of the three-phase excitation generator EX Increase to several multiples of the rated excitation current; according to the target angle, the single-phase power supply maintains the increased excitation current for a specific time; and when the output of the single-phase power supply is adjusted to the target amplitude and the target angle At this time, the single-phase power supply restores the excitation current to the rated excitation current.
  • a grounding transformer is provided with a compensation voltage of appropriate phase and amplitude through a single-phase power supply, which can reduce the voltage at the ground fault point and eliminate the arc at the ground fault point.
  • Fig. 1 is one of the schematic diagrams of an arc suppression system according to an embodiment of the present invention
  • Fig. 2 is a second schematic diagram of an arc suppression system according to an embodiment of the present invention.
  • Fig. 3 is a third schematic diagram of an arc suppression system according to an embodiment of the present invention.
  • Figure 4 is a schematic diagram of a single-phase power supply according to an embodiment of the present invention.
  • Fig. 5 is a schematic diagram of a single-phase synchronous generator according to an embodiment of the present invention.
  • Fig. 6 is a schematic diagram of a stator winding connection according to an embodiment of the present invention.
  • Figure 7 is a schematic diagram of a rotor winding connection according to an embodiment of the present invention.
  • Fig. 8 is a flowchart of an arc suppression method according to an embodiment of the present invention.
  • Fig. 9 is a detailed flowchart of an arc suppression method according to an embodiment of the present invention.
  • Fig. 10 is a flowchart of an arc suppression method according to a specific example of the present invention.
  • Fig. 1 is one of the schematic diagrams of an arc suppression system according to an embodiment of the present invention.
  • the arc suppression system includes: a grounding transformer 1, the first end of which is connected to the power distribution network, and the second end is through a generator unit 3Ground.
  • the arc suppression system further includes: a voltage sensor 4 connected to the power distribution network; and a measurement and control unit 5 respectively connected to the voltage sensor 4 and the generator unit 3, the measurement and control unit 5 according to the voltage sensor 4 feedback of the distribution
  • the voltage of the power grid determines whether a ground fault occurs in the distribution network, and, in the case of a ground fault, the measurement and control unit 5 controls the generator unit 3 to adjust the amplitude and angle of the compensation voltage accordingly.
  • the grounding transformer 1 is provided with a compensation voltage of appropriate phase and amplitude through the generator unit 3, which can reduce the voltage at the ground fault point and eliminate the arc at the ground fault point.
  • the generator unit 3 may be a single-phase power source (single-phase synchronous generator), and its specific structure will be described in detail below.
  • the voltage sensor 4 can be any sensor capable of detecting voltage signals in the related art. Those skilled in the art know that the addition of the voltage sensor 4 is beneficial to more accurately determine whether a ground fault occurs in the distribution network, and in the event of a ground fault, the generator unit 3 provides the grounding transformer 1 with appropriate phase and amplitude. Compensation voltage.
  • the arc suppression system further includes: a current sensor 6 connected in series with the generator unit 3 for detecting the current of the generator unit 3; and the measurement and control unit 5 also feedbacks according to the current sensor 6
  • the current of the generator unit 3 determines whether the ground fault of the distribution network is an instantaneous ground fault or a permanent ground fault.
  • the addition of the current sensor 6 is beneficial to further determine whether the ground fault of the distribution network is an instantaneous ground fault or a permanent ground fault, so as to further trigger other electronic components according to the ground fault (for example, not shown in the figure).
  • the ground fault selector switch is opened or closed accordingly.
  • the generator unit 3 can be connected in series with the current sensor 6 (see Fig. 1). According to the embodiment of the present invention, the generator unit 3 can also be connected to the grounding transformer 1 through the isolation coil 7 (see FIG. 2). Wherein, the isolation coil 7 includes a first coil and a second coil mutual inductance with the first coil, wherein the first end of the generator unit 3 is connected to the first end of the second coil, and the generator unit 3 The second end is connected to the second end of the second coil.
  • FIG. 3 is the third schematic diagram of the arc suppression system according to the embodiment of the present invention.
  • the arc suppression system further includes a compensation coil 2 connected in series with the generator unit 3.
  • the compensation coil 2 is further used to provide the grounding transformer 1 with a compensation voltage of appropriate phase and amplitude, which can further reduce the ground fault point voltage and eliminate the ground fault point arc.
  • the embodiment of the present invention also provides a single-phase power supply.
  • Fig. 4 is a schematic diagram of a single-phase power supply according to an embodiment of the present invention.
  • the single-phase power supply includes: a three-phase asynchronous motor M, a single-phase synchronous generator G, and a three-phase excitation generator connected by a coupling Generator EX, where the three-phase excitation generator EX rotates following the three-phase asynchronous motor M and generates three-phase alternating current, wherein the three-phase alternating current is rectified and supplied to the DC excitation winding of the single-phase synchronous generator G, and the single-phase
  • the synchronous generator G follows the three-phase asynchronous motor M to rotate and provides a single-phase power output.
  • the single-phase power output provided by the single-phase synchronous generator G is a compensation voltage with adjustable phase and amplitude, which can be applied to any of the above-mentioned arc suppression systems.
  • the following describes in detail how to provide a compensation voltage with adjustable phase and amplitude in combination with the structure of the single-phase synchronous generator.
  • Fig. 5 is a schematic diagram of a single-phase synchronous generator according to an embodiment of the present invention.
  • the single-phase synchronous generator G includes a rotor assembly and a stator assembly.
  • the rotor assembly is connected to the three-phase asynchronous motor M through the above-mentioned coupling and follows it to keep rotating.
  • the rotor assembly includes: a rotor core, a DC excitation winding, and a cage structure winding arranged at the slot position of the rotor core;
  • the stator assembly includes: a stator core and a single-phase power output winding for providing the single-phase power output.
  • the power output winding can induce the corresponding phase and amplitude. Adjustable single-phase power output.
  • the embodiment of the present invention also sets the following in the position of the notch of the rotor core Cage structure winding in order to eliminate the negative sequence magnetic field as much as possible.
  • the cage structure winding adopts a fully damped structure, that is, the number of leads composing the cage structure winding is the same as the number of slots in the rotor core.
  • the conductive bars composing the cage structure winding have a sufficient cross-sectional area, for example, the cross-sectional area is the same as the winding cross-sectional area of the single-phase power output winding.
  • the conductive bars composing the cage structure winding are made of low-resistance materials, such as gold, silver or red copper.
  • increasing the air gap of the single-phase synchronous generator G to 1.2 to 1.8 times its rated air gap may also eliminate the negative sequence magnetic field.
  • increasing the air gap will significantly reduce the interaction between the negative sequence air gap rotating magnetic field and the positive sequence air gap rotating magnetic field, thereby significantly reducing the negative sequence magnetic field.
  • the single-phase power supply also includes a chopper for chopping the rectified DC power under the control of the controller, so as to adjust it to suit the single-phase power supply.
  • Phase synchronous generator G voltage Phase synchronous generator G voltage.
  • the rectifier and the chopper can be installed on a three-phase excitation generator and rotate with it. It should be noted that the combination of the above-mentioned three-phase excitation generator, rectifier and chopper is only an embodiment of the present invention. In practical applications, any suitable excitation current can be provided to the DC excitation winding of a single-phase synchronous generator.
  • the implementation modes should all be included in the protection scope of the present invention.
  • the single-phase power supply also includes a frequency converter, which is used to adjust the input frequency of the three-phase asynchronous motor M under the control of the controller, thereby adjusting its speed.
  • a frequency converter which is used to adjust the input frequency of the three-phase asynchronous motor M under the control of the controller, thereby adjusting its speed.
  • the present invention also provides a specific example.
  • the motor can choose 380V/200KW variable frequency motor. It can keep rotating according to the corresponding speed under the adjustment of the frequency converter. In addition, regardless of whether the three-phase excitation generator EX generates an excitation current, the inverter motor always keeps rotating.
  • the exciter can choose 220V/4KW three-phase AC generator. For example, taking the Y132 motor as a reference, a generator whose stator is DC excitation and the rotor is a three-phase armature winding. At the same time, the rated value of the DC excitation voltage of the exciter can be 75V, and the excitation current can be 4A, powered by an external power supply, and stabilized and smoothed with a capacitor.
  • the generator can take the Y355 motor as a reference, adopt a generator with a rotor for DC excitation and a stator for single-phase power output.
  • the power output provided by it can achieve voltage 0-1000V, current 0-150A, and the transition process is no more than 150ms.
  • Fig. 8 is a flowchart of an arc suppression method according to an embodiment of the present invention. As shown in Fig. 8, the method includes the following steps S802 to S804.
  • step S802 the single-phase power supply receives a control instruction from the measurement and control unit, where the control instruction is used to indicate the target amplitude and target angle of the compensation voltage when a ground fault occurs in the distribution network.
  • step S804 the single-phase power supply adjusts its single-phase power output to the target amplitude and the target angle.
  • a grounding transformer is provided with a compensation voltage of appropriate phase and amplitude through a single-phase power supply, which can reduce the voltage at the ground fault point and eliminate the arc at the ground fault point.
  • Fig. 9 is a detailed flowchart of an arc suppression method according to an embodiment of the present invention. As shown in FIG. 9, step S804 includes the following steps S8042 to S8046.
  • step S8042 according to the target amplitude, the single-phase power supply increases the excitation current of the three-phase excitation generator EX to several multiples of the rated excitation current.
  • step S8044 according to the target angle, the single-phase power supply continues the enhanced excitation current for a specific time.
  • step S8046 when the output of the single-phase power supply is adjusted to the target amplitude and the target angle, the single-phase power supply restores the excitation current to the rated excitation current.
  • the embodiment of the present invention adopts strong excitation several times higher than the rated excitation, which can improve the response speed of the single-phase power supply, make it output the compensation current of the target amplitude and target angle faster, reduce the voltage of the ground fault point faster, and eliminate the grounding Arc at the fault point.
  • the present invention also provides a specific example.
  • Fig. 10 is a flowchart of an arc suppression method according to a specific example of the present invention. As shown in FIG. 10, the method includes the following steps S1002 to S1010.
  • step S1002 the system runs normally without load.
  • step S1004 it is judged whether the system has a single-phase grounding, if yes, proceed to step S1006, otherwise, return to step S1002.
  • step S1006 high-strength excitation is used to adjust the excitation current.
  • step S1008 it is judged whether the rated excitation is satisfied, if so, continue to step S1010, otherwise, return to step S1006.
  • the present invention provides a single-phase power supply, an arc suppression system and an arc suppression method.
  • the single-phase power supply includes: a three-phase asynchronous motor, a single-phase synchronous generator, and a three-phase excitation generator connected by a coupling, wherein the three-phase excitation generator rotates following the three-phase asynchronous motor and generates three-phase alternating current,
  • the three-phase alternating current is rectified and supplied to the DC excitation winding of the single-phase synchronous generator, and the single-phase synchronous generator rotates with the three-phase asynchronous motor and provides a single-phase power output.
  • the invention provides the grounding transformer with a compensation voltage of suitable phase and amplitude through a single-phase power supply, which can reduce the voltage at the ground fault point and eliminate the arc at the ground fault point.
  • modules or steps of the present invention can be implemented by a general computing device, and they can be concentrated on a single computing device or distributed in a network composed of multiple computing devices.
  • they can be implemented with program codes executable by a computing device, so that they can be stored in a storage device to be executed by the computing device, or they can be made into individual integrated circuit modules, or their Multiple modules or steps are made into a single integrated circuit module to achieve.
  • the present invention is not limited to any specific combination of hardware and software.

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  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Control Of Eletrric Generators (AREA)

Abstract

La présente invention concerne une alimentation électrique monophasée, un système de suppression d'arc et un procédé de suppression d'arc. L'alimentation électrique monophasée comprend : un moteur asynchrone triphasé (M), un générateur synchrone monophasé (G) et un générateur d'excitation triphasé (EX) qui sont reliés au moyen de raccords d'arbre ; le générateur d'excitation triphasé (EX) suit le moteur asynchrone triphasé (M) de manière à entrer en rotation et générer un courant alternatif triphasé ; le courant alternatif triphasé est redressé et fourni à un bobinage d'excitation à courant continu du générateur synchrone monophasé (G) ; et le générateur synchrone monophasé (G) suit le moteur asynchrone triphasé (M) de manière à entrer en rotation et fournir une alimentation électrique monophasée pour la sortie. L'alimentation électrique monophasée fournit un transformateur de mise à la terre (1) ayant une tension de compensation dont la phase et l'amplitude sont appropriées, ce qui permet de réduire la tension au niveau d'un point de défaut de mise à la terre et d'éliminer l'arc au point de défaut de mise à la terre.
PCT/CN2020/137526 2020-02-26 2020-12-18 Alimentation électrique monophasée, système de suppression d'arc et procédé de suppression d'arc WO2021169519A1 (fr)

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CN211701481U (zh) * 2020-02-26 2020-10-16 安徽一天电气技术股份有限公司 消弧系统
CN113169549A (zh) * 2020-12-18 2021-07-23 安徽一天电气技术股份有限公司 单相电源、消弧系统及消弧方法
CN112740521A (zh) * 2020-12-18 2021-04-30 安徽一天电气技术股份有限公司 单相同步发电机、单相电源、消弧系统及消弧方法

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JPH0295176A (ja) * 1988-09-29 1990-04-05 Fuji Electric Co Ltd 電力回生装置
CN1421983A (zh) * 2001-11-27 2003-06-04 清华泰豪科技股份有限公司 大容量单相无刷同步发电机
CN202353410U (zh) * 2011-11-01 2012-07-25 株洲南方燃气轮机成套制造安装有限公司 无刷励磁发电机
CN105262076A (zh) * 2015-11-12 2016-01-20 国家电网公司 一种中性点不接地系统中接地故障时的消弧方法及装置
CN107276097A (zh) * 2017-07-05 2017-10-20 长沙理工大学 非有效接地系统接地故障相降压消弧的安全运行方法
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