WO2021000610A1 - Appareil et procédé d'équilibrage et de stabilisation de tension - Google Patents

Appareil et procédé d'équilibrage et de stabilisation de tension Download PDF

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Publication number
WO2021000610A1
WO2021000610A1 PCT/CN2020/081420 CN2020081420W WO2021000610A1 WO 2021000610 A1 WO2021000610 A1 WO 2021000610A1 CN 2020081420 W CN2020081420 W CN 2020081420W WO 2021000610 A1 WO2021000610 A1 WO 2021000610A1
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WIPO (PCT)
Prior art keywords
voltage
phase
switch
output voltage
adjustment
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PCT/CN2020/081420
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English (en)
Chinese (zh)
Inventor
王振铎
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王振铎
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Publication of WO2021000610A1 publication Critical patent/WO2021000610A1/fr

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    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J3/00—Circuit arrangements for ac mains or ac distribution networks
    • H02J3/26—Arrangements for eliminating or reducing asymmetry in polyphase networks
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E40/00—Technologies for an efficient electrical power generation, transmission or distribution
    • Y02E40/50—Arrangements for eliminating or reducing asymmetry in polyphase networks

Definitions

  • the present invention relates to the field of electric power, in particular to a voltage balance stabilizing device and method for improving voltage quality.
  • the stability of the power system voltage is related to the reliability of power users and affects the safe operating life of electrical equipment. Therefore, ensuring product quality is even related to life safety. Due to the instability of the power supply voltage of the power system, there are many cases of various accidents caused. For example, the safe operation of elevators, medical equipment in hospitals, life maintenance systems, fires caused by unstable power and voltage, etc.
  • the existing power regulators mainly have the following technical means:
  • thyristor voltage regulation The main principle of thyristor voltage regulation is phase regulation and voltage regulation. In the process of voltage regulation, certain power harmonics and additional losses will be generated, especially when the current is large, air cooling or water cooling is required for cooling. Higher losses will have a certain impact on the normal operation of power supply and consuming equipment, in particular, it will cause heating of transformers, motors, capacitors and other equipment, and cause certain interference to communication equipment.
  • the existence of the short circuit process causes the phenomenon of "sparking and discharge".
  • the current in the adjustment process is very limited, and it can only be made into a device with a small capacity.
  • the coils and brushes need to be replaced due to wear. , Can not work reliably and stably for a long time.
  • the on-load voltage regulation of power transformers can only be performed on the high-voltage side.
  • the current construction and operation costs of on-load voltage regulation switchgear are relatively high, and the safe working life is relatively short. On average, the cost of each adjustment is also high. It is extremely unsuitable for occasions that require several adjustments.
  • the current transformer tapped voltage regulation mainly includes the following types:
  • the above two voltage adjustment methods both have a short-term power outage process, and have an impact on the power supply and use equipment, which poses safety risks.
  • voltage balance and stability are the primary technical indicators for measuring power quality.
  • the balance and stability of power system voltage are related to the reliability of power users, affecting the safe operating life of electrical equipment, affecting product quality and even life safety. Due to the instability of the power supply voltage of the power system, there are many cases of various accidents caused. For example, the safe operation of elevators, medical equipment in hospitals, life maintenance systems, fires caused by unstable power and voltage, etc.
  • the on-load voltage regulation in society does not have any additional harmonics, and does not require power outage adjustment, and the voltage regulation technology without voltage bumps and sinks during the adjustment process has not yet appeared.
  • the present invention provides a device and method for controlling the automatic balance and stabilization of three-phase voltage.
  • a three-phase voltage balance and stabilization device includes an input voltage sampling device, an output voltage sampling device, an output voltage setting device, a core controller, and a voltage Adjustment switch, voltage adjustment transformer; wherein the input voltage sampling device is used to sample the input voltage of each phase; the output voltage sampling device is used to sample the output voltage of each phase; the output voltage setting device is used to output the output of each phase The voltage is set; the voltage adjustment switch of each phase is respectively connected to the voltage adjustment transformer of the phase; the core controller is used to receive the sampled input voltage, the sampled output voltage, and the set output voltage of each phase , To control the voltage adjustment switch of each phase and the voltage adjustment transformer to adjust the voltage gear of each phase.
  • the three-phase voltage balance and stabilization device further includes a work control switch and a bypass switch, and the bypass switch is used to bypass the voltage adjustment transformers of each phase.
  • the work control switch is used to adjust the working state of the voltage adjustment switch and the voltage adjustment transformer of each phase.
  • the core controller is composed of PLC or MCU or logic gate circuit hardware control circuit.
  • the voltage adjustment transformer is composed of three single-phase transformers.
  • the input or output voltage sampling device is composed of a voltage transformer or a voltage divider resistor.
  • the output voltage setting device is composed of a hardware numeric keyboard or a touch screen, and can be remotely communicated or wirelessly controlled.
  • the work control switch is constituted by a contactor.
  • the voltage adjustment switch is composed of a relay and a contactor or a power electronic switch circuit.
  • the bypass switch is composed of a control relay and a contactor.
  • the bypass switch K o of each phase is respectively connected to the input voltage and the voltage adjustment transformer of each phase;
  • the voltage adjustment switch includes a transition resistance switch K R , voltage selection gear switches K 1 , K 2 , K N , K N+1 , K N+N ;
  • K 1 , K 2 , K N , K N+1 , K N+N are also short-circuit switches, that is, the voltage selection gear switch is also used as a short-circuit switch ;
  • FireWire operation control switch comprises a switch control K -, K -N and grounding switch K +, K + N;
  • each voltage transformer includes adjusting phases respectively corresponding to the voltage selector position switch K 1, K 2, K N , K
  • K R is connected in series with the resistor R and then connected in parallel with K N.
  • a three-phase voltage balance and stabilization method based on the above-mentioned three-phase voltage balance and stabilization device.
  • the method includes: an output voltage setting device sets the output voltage V sd of each phase; the input voltage sampling device samples the input voltage V of each phase i ; the core controller receives the set value V sd of each phase of the output voltage setting device; the core controller receives the input voltage V i of each phase collected by the input voltage sampling link; the core controller calculates the value of V i -V sd according to V i -V sd controls the voltage adjustment switch of each phase and the voltage adjustment transformer to adjust the voltage range of each phase.
  • the step of adjusting the voltage of each phase includes and the working process is as follows: short-circuit the primary circuit of the voltage adjustment transformer; open the bypass switch K 0 ; close the transition resistance switch K R ; open the grounding switch All switches outside; in accordance with the difference between the input voltage and the set voltage, the control switch K is determined close the switch the voltage regulator -, K + N or K +, K -N; closing the voltage selector position switch K 1, K 2.
  • K N , K N+1 , K N+N disconnect the transition resistance switch K R.
  • the core controller acquires a sampling means sampling the output voltage V o of the output voltage, when the output voltage V sd sampled output voltage V o and the set V o -V sd difference exceeds a predetermined range, based on the difference V o -V sd select the new voltage adjustment switch gear, that is, the new voltage selection gear switch to be closed K 1 , K 2 , K N , K N+1 , K N+N ; close the transition resistance control switch K R ; disconnect the closed voltage selection gear switch; close one of the new voltage selection gear switches K 1 , K 2 , K N , K N+1 , K N+N ; disconnect the transition resistance Switch K R.
  • This scheme uses the principle of electromagnetic mechanism to realize automatic detection of three-phase voltage through logic control circuit. According to the voltage difference of the detected three-phase voltage and the set target voltage value, the three-phase voltage is automatically adjusted by phase to make it three-phase voltage. Automatically maintain balance and stability; and automatically adjust when the voltage value deviates from the target value. During the adjustment process, there is no sudden change in voltage, and it can be safely adjusted with load, without any additional harmonics and power failure.
  • Fig. 1 is a schematic diagram of the structure of the three-phase voltage balance and stabilization device of the present invention.
  • Figure 2 is a circuit connection diagram of the three-phase voltage balance and stabilization device of the present invention.
  • the voltage balance and stabilization device proposed by the present invention includes a DC working power supply, input and output voltage sampling device, output voltage setting device, core controller, work control switch, voltage adjustment switch, voltage adjustment transformer, bypass switch.
  • the DC working power supply provides working power for the DC working part of each link in the device;
  • the input and output voltage sampling device is mainly composed of a voltage transformer or a voltage divider resistor, and the input voltage sampling device is used to sample the input of each phase
  • the voltage and output voltage sampling device is used to sample the output voltage of each phase;
  • the output voltage setting device is composed of a hardware digital keyboard or touch screen and a DC voltage adjustment switch. It can be remotely communicated or wirelessly controlled to perform the output voltage of each phase.
  • core controller composed of PLC or MCU or logic gate circuit hardware control circuit, etc., used to receive the sampled input voltage, sampled output voltage, and set output voltage of each phase to control each
  • the phase voltage adjustment switch and voltage adjustment transformer adjust the voltage gear of each phase
  • the work control switch is composed of a contactor and is connected to the voltage adjustment switch of each phase.
  • the work control switch is used to adjust the voltage adjustment switch and voltage adjustment of each phase.
  • the working state of the transformer; the voltage adjustment switch of each phase is composed of a relay and a contactor or a power electronic switch circuit, which is connected to the voltage adjustment transformer of the phase; the voltage adjustment transformer of each phase is composed of three single-phase transformers
  • the bypass switch is composed of a control relay and a contactor, and the bypass switch is used to bypass the voltage adjustment transformer of each phase.
  • K 0a , K 0b , and K 0c are the bypass switches for the three phases of A, B, and C, which are connected to the input voltage of the three phases of A, B, and C and the voltage adjustment transformer.
  • K 0 means the bypass switch of each phase
  • K R is the transition resistance switch
  • K 1 , K 2 , K N , K N+1 , K N+N are voltage selection gear switches
  • K 1 , K 2 , K N , K N+1 , K N+N are also short-circuit switches, that is, voltage selection gear switches can also be used as short-circuit switches
  • K - and K -N are live wire control switches
  • K + and K +N are grounding switches
  • N' is the secondary coil
  • N 1 , N 2 , N N , N +1 , and N +N are the primary coils, respectively, and the corresponding voltage selection gear switches K 1 , K 2 , K N , K N+1 , K N+N is connected
  • M
  • the voltage selection gear switches of each phase have the same circuit structure as the primary and secondary coils, so the same symbols are used to indicate them.
  • the above-mentioned voltage selection gear switch and transition resistance switch constitute the above-mentioned voltage adjustment switch, and the primary and secondary coils and iron core constitute the above-mentioned voltage adjustment transformer.
  • the output voltage setting device sets the output voltage V sd of each phase; among them, the output voltage of the three phases A, B, and C can be set as V sda , V sdb , and V sdc respectively .
  • V sd is used below. description.
  • the input voltage sampling device samples the input voltage V i of each phase; the same as the above, V i is used here for a brief description.
  • the core controller receives each phase setting value V sd of the output voltage setting device
  • the core controller receives the input voltage is sampled in each segment acquisition phase input voltage V i;
  • the core controller calculates the value V i -V sd, each phase adjustment of the control voltage and the voltage adjusting transformer reset switch gear according to each phase voltage V i -V sd.
  • Specific gear adjustment methods include:
  • the core controller acquires a sampling means sampling the output voltage V o of the output voltage, when the output voltage V sd sampled output voltage V o and the set V o -V sd difference exceeds a predetermined range, based on the difference V o -V sd selects the new voltage adjustment switch gear, that is, the new voltage selection gear switch K 1 , K 2 , K N , K N+1 , K N+N when the voltage needs to be re-adjusted ;
  • Disconnect the closed voltage selection gear switch (one of K 1 , K 2 , K N , K N+1 , K N+N );
  • the invention effectively solves the problems that have plagued the three-phase voltage unbalance and instability of the power system for a long time, protects power supply equipment and electrical equipment, reduces line loss, improves power supply quality, and plays the role of energy saving and consumption reduction.

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  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Supply And Distribution Of Alternating Current (AREA)
  • Ac-Ac Conversion (AREA)

Abstract

La présente invention concerne un appareil d'équilibrage et de stabilisation de tension triphasée, qui se rapporte au domaine de l'électricité. L'appareil d'équilibrage et de stabilisation de tension triphasée comprend un appareil d'échantillonnage de tension d'entrée, un appareil d'échantillonnage de tension de sortie, un appareil de réglage de tension de sortie, un dispositif de commande central, des commutateurs d'ajustement de tension et des transformateurs d'ajustement de tension, l'appareil d'échantillonnage de tension d'entrée étant utilisé pour échantillonner des tensions d'entrée de diverses phases ; l'appareil d'échantillonnage de tension de sortie est utilisé pour échantillonner des tensions de sortie de diverses phases ; l'appareil de réglage de tension de sortie est utilisé pour régler les tensions de sortie des différentes phases ; un commutateur d'ajustement de tension de chaque phase est connecté à un transformateur d'ajustement de tension de la phase ; et le dispositif de commande central est utilisé pour recevoir les tensions d'entrée échantillonnées, les tensions de sortie échantillonnées et les tensions de sortie définies des différentes phases, de manière à commander le commutateur d'ajustement de tension et le transformateur d'ajustement de tension de chaque phase pour ajuster un décalage de tension de chaque phase. Selon la solution, une valeur de tension triphasée peut être ajustée, équilibrée et stabilisée automatiquement et en toute sécurité.
PCT/CN2020/081420 2019-07-04 2020-03-26 Appareil et procédé d'équilibrage et de stabilisation de tension WO2021000610A1 (fr)

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CN201910600005.0A CN112186784A (zh) 2019-07-04 2019-07-04 三相电压平衡装置及方法
CN201910600005.0 2019-07-04

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Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN1728492A (zh) * 2004-07-27 2006-02-01 乌鲁木齐市神安实业有限公司 三相电压不平衡保护器
CN104065058A (zh) * 2013-03-21 2014-09-24 中国矿业大学 一种三相独立控制的电压不平衡发生器
CN104300562A (zh) * 2014-10-28 2015-01-21 国网辽宁省电力有限公司朝阳供电公司 一种解决三相电压不平衡的方法
CN105811441A (zh) * 2016-05-19 2016-07-27 山东电工电气集团新能科技有限公司 相间电容三相不平衡与无功治理装置及方法
US20170093284A1 (en) * 2015-09-28 2017-03-30 Denso Corporation Control device of power supply system and power supply unit
CN109167375A (zh) * 2018-10-23 2019-01-08 兰州理工大学 电动汽车充电站三相电压自动平衡充电***及充电方法

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* Cited by examiner, † Cited by third party
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CN106803675A (zh) * 2015-11-26 2017-06-06 北海市深蓝科技发展有限责任公司 无涌流无电弧换档的三相配电线路自动调压方法
CN105719817B (zh) * 2016-03-03 2018-07-13 北京平开智能电气有限公司 一种永磁真空有载调压开关、变压器及有载调压方法

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN1728492A (zh) * 2004-07-27 2006-02-01 乌鲁木齐市神安实业有限公司 三相电压不平衡保护器
CN104065058A (zh) * 2013-03-21 2014-09-24 中国矿业大学 一种三相独立控制的电压不平衡发生器
CN104300562A (zh) * 2014-10-28 2015-01-21 国网辽宁省电力有限公司朝阳供电公司 一种解决三相电压不平衡的方法
US20170093284A1 (en) * 2015-09-28 2017-03-30 Denso Corporation Control device of power supply system and power supply unit
CN105811441A (zh) * 2016-05-19 2016-07-27 山东电工电气集团新能科技有限公司 相间电容三相不平衡与无功治理装置及方法
CN109167375A (zh) * 2018-10-23 2019-01-08 兰州理工大学 电动汽车充电站三相电压自动平衡充电***及充电方法

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