WO2005067117A1 - Appareil pour reguler l'energie electrique - Google Patents

Appareil pour reguler l'energie electrique Download PDF

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Publication number
WO2005067117A1
WO2005067117A1 PCT/JP2005/000432 JP2005000432W WO2005067117A1 WO 2005067117 A1 WO2005067117 A1 WO 2005067117A1 JP 2005000432 W JP2005000432 W JP 2005000432W WO 2005067117 A1 WO2005067117 A1 WO 2005067117A1
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WO
WIPO (PCT)
Prior art keywords
power
voltage
phase
bridge circuit
current
Prior art date
Application number
PCT/JP2005/000432
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English (en)
Japanese (ja)
Inventor
Ryuichi Shimada
Original Assignee
The Circle For The Promotion Of Science And Engineering
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by The Circle For The Promotion Of Science And Engineering filed Critical The Circle For The Promotion Of Science And Engineering
Publication of WO2005067117A1 publication Critical patent/WO2005067117A1/fr

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Classifications

    • 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
    • H02J3/18—Arrangements for adjusting, eliminating or compensating reactive power in networks
    • H02J3/1807—Arrangements for adjusting, eliminating or compensating reactive power in networks using series compensators
    • H02J3/1814—Arrangements for adjusting, eliminating or compensating reactive power in networks using series compensators wherein al least one reactive element is actively controlled by a bridge converter, e.g. unified power flow controllers [UPFC]
    • 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
    • Y02E40/10—Flexible AC transmission systems [FACTS]

Definitions

  • the present invention aims to increase the utilization efficiency of power generation equipment by interconnecting power systems via power transmission lines and to exchange power, and to obtain supply reliability and stability for consumers.
  • the present invention relates to a power control device for controlling a tidal current.
  • the power flow in the interconnected transmission line is mainly limited by the phase difference and the reactance of the voltage vectors at the transmitting and receiving ends.
  • Vi and V 2 represent the magnitude of the voltage vector, and ⁇ is the phase difference between the voltage vectors.
  • Power V 2 when the load is resistive, electrostatic back EMF RI Considering the voltage, Equation 1 above can be extended to the case of power supply and resistive load.
  • the above equation 1 can be similarly applied not only to a resistor but also to a voltage source such as a generator in a motor or a power system. Since the resistance component of the line is generally sufficiently small compared to X, it can be ignored here.
  • a series capacitor is used to offset the reactance voltage in order to improve the power factor of an inductance circuit, and this is partly implemented as series capacitor compensation.
  • Equation 1 of the above power is equivalent to reducing the reactance X of the denominator, and the effect is large.However, since the impedance greatly changes with frequency and current, the series element compensation May be unstable, and in fact, an accident has occurred due to the low-frequency series resonance phenomenon.
  • a voltage phase adjuster UPFC (Unified Power Flow Controller) using a power electronics device is also known as the FACTS device. This is to control the power flow by adjusting the voltage phase difference between the transmitting end and the receiving end. In other words, power flow is controlled by adjusting the voltage phase by supplying a voltage of variable magnitude and an arbitrary phase in series with the system voltage by the serial converter using the DC power supplied from the parallel converter.
  • the conventional UPFC has a large installed capacity in the evening, is not suitable for miniaturization, and has a problem in terms of cost.
  • This switch stores the magnetic energy of the current at the time of cutoff in a storage capacitor provided in the switch, so that the current is cut off at an arbitrary timing, and when the switch is turned on again, the stored energy is discharged in the reverse direction. Thus, the current at the time of interruption can be recovered.
  • the power factor can be set to 1 if the current phase is made in phase with the voltage phase, for example (Japanese Patent Application No. 2003-67337). book).
  • the inventor of the present application proposes that the switch capable of forcibly controlling the current is connected in series between a power supply and another power supply, and the phase of the current is controlled by the switch gate control signal.
  • the switch capable of forcibly controlling the current is connected in series between a power supply and another power supply, and the phase of the current is controlled by the switch gate control signal.
  • the magnetic energy regeneration bidirectional current switch becomes SSRC
  • the role of series capacitor compensation can be substituted by combining a semiconductor switch and a DC capacitor. In this case, even if the current changes or the power supply frequency changes, the power factor can be automatically set to 1 to compensate for the line reactance.
  • Equation 1 the power transmission
  • the power transmission increases until it is limited by the current determined by the resistance.
  • the voltage phase of the load may continue to accelerate and become unstable.
  • the present invention has been made in view of the circumstances described above, and the present invention compensates for the drawbacks of the conventional series capacitor compensation and the conventional UPFC, and has a relatively small-capacity facility and is low-cost and stable.
  • Aiming to provide a power control device capable of performing power flow control, in addition to improving the power factor by using the above-mentioned SSRC to increase the output of the rotating machine and increase the power By forcibly changing the phase, more versatile power control is performed, which not only increases the amount of power transmitted between power sources, but also contributes to stabilization of the mechanical system.
  • the present invention relates to a power control device for performing power flow control between power systems, and an object of the present invention is to insert a power supply line of an AC power transmission line in series between a transmission end voltage source and a reception end voltage source and transmit power.
  • a power control device for controlling the power flow of the AC power wherein the power control device is connected between a bridge circuit including four reverse conducting semiconductor switches and a DC terminal of the bridge circuit.
  • control means advances or delays the current phase from the voltage phase from a state of a power factor 1 in which the current phase of the AC power is synchronized with the voltage phase without a phase difference. This is effectively achieved by controlling the on / off state of the gate to adjust the power flow rate of the transmitted power.
  • Fig. 1 shows the SSRC connected in series on the line connecting the power supply and the power supply.
  • Fig. 2 is a circuit diagram of one phase of three phases in which the impedance of the line is represented by L and R.Fig. 2 shows that if switching is performed at a timing synchronized with the voltage, the capacitor can be made to resonate in series. It is a figure for explaining.
  • FIG. 3 is a feather diagram showing the relationship between the voltage vector and the current vector
  • FIG. 4 is a graph showing the relationship between the power flow and the phase difference.
  • the present invention uses a magnetic energy regenerative bidirectional switch, which is a current control switch composed of a semiconductor device, and connects in series between a power supply and a load or another power supply to form a gate synchronized with the phase of the power supply voltage.
  • a magnetic energy regenerative bidirectional switch which is a current control switch composed of a semiconductor device, and connects in series between a power supply and a load or another power supply to form a gate synchronized with the phase of the power supply voltage.
  • a bidirectional current switch that regenerates magnetic energy is connected in series to the transmission line as SSRC, and turned on and off with a phase signal that matches the voltage phase of the power supply. At this time, it is the first choice to select the capacity of the capacitor so that the magnetic energy of the line can be stored. However, if the capacity is reduced, the capacitor voltage changes greatly, so it should be selected according to the requirements of the system.
  • Example FIG. 1 is a circuit diagram for explaining an embodiment of the present invention, showing only one phase of three phases.
  • the net electric grid Vido) and receiving end power system V 2 trans leakage including by inductors evening power transmission line with a Nsu L (40) (20) is connected.
  • the resistance (50) of the line is R.
  • a series switching resonance capacitor SSRC (30) is inserted in series between the transmitting end power system VidO) and the receiving end power system V 2 (20).
  • the SSRC (30) is a bridge circuit composed of four reverse conducting semiconductor switches G1 to G4, and is connected between the DC terminals of the bridge circuit and the magnetic energy of the transmission line when the bridge circuit is cut off. And a control means for generating an on / off control signal for the gate of the reverse conducting semiconductor switch.
  • the control means includes a pair of reverse conducting semiconductor switches (Gl, G2) and (G3, G4) located on a diagonal line among four reverse conducting semiconductor switches G1 to G4 constituting the bridge circuit. ) are controlled so as to simultaneously perform on-off operations, respectively, and when one pair is on, the other pair is controlled to be off, and the on / off control signal is the power transmitting terminal. It is set to switch in synchronization with the voltage of the power system (VIO). If the on / off timing is synchronized with the voltage waveform and performed with a phase difference, the phase of the current can be changed.
  • VIO voltage of the power system
  • the reactance (40) of the transmission line includes the transformer leakage, etc.
  • the resistance is 0.25p.u. and the resistance is 0.05p.u.
  • the magnetic energy regenerating switch has four P-MOSFETs connected together with a reverse conducting diode as shown in Fig. 1.
  • a signal is obtained by the sensor from the voltage waveform, and the signal is sent to the gate control circuit of the P-MOSFET with the phase advance or the time delayed by the gate controller.
  • G1 and G2 P-MOSFET pairs located on the diagonal line are given a gate signal at the same time, and G3 and G4 pairs are turned on and off by their opposite logic signals in consideration of the dead time. .
  • Equation 1 The reactance X in Equation 1 is compensated by SSRC, and the capacitor voltage rises.As a result, the current is determined by the resistance voltage drop, as can be seen from the phasor diagram in Fig. 3, and the current increases. The power PV ⁇ I-cos 9 increases.
  • Figure 4 shows the relationship between the power flow and the change in phase difference ⁇ 5.
  • ⁇ _20 degrees
  • current phase advance 6> 20 degrees compared to the conventional case. In comparison, it is 2.38 times.
  • the generated voltage of SSRC at this time is about the voltage for the reactance, so it is about 25% of the rated voltage.
  • the capacity of the SSRC equipment may be about the impedance voltage of the line, the SSRC capacity may be about 0.25 pu, and since the capacitor is charged only with DC voltage, the service life is expected to be significantly longer than that of the AC capacitor. Is received.
  • the phase difference between the transmitting end and the receiving end will be a fraction of a fraction. This greatly improves the stability of the system, whether it is out of step or not, as compared with the transient stability of the system, and provides a large margin in the event of a short circuit caused by a lightning strike.
  • the present invention is characterized in that, for connection between power systems, the SSRC is connected in series to the line to intermittently control the current and actively control the current phase rather than the voltage phase.
  • the conventional power control system Patent No. 1 that can control the transmission of larger power, which is not possible due to restrictions on reactance, etc., and inserts the voltage generated by the already-patented semiconductor converter to insert power. No. 2903336, Japanese Patent No. 2867171, Japanese Patent No. 3092858, and Japanese Patent No. 3092857).
  • a power control device having various effects can be realized.
  • Industrial applicability According to the power control device using the SSRC of the present invention, the transmission power flow of the power transmission line can be transmitted beyond the upper limit determined by the difference between the conventional reactance and the phase angle.
  • the voltage phase difference can be reduced to a fraction of that in the absence of this SSRC, so that there is a margin before step-out in the event of fluctuations, and dynamic stability in the event of a system fault Increase.

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  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Control Of Electrical Variables (AREA)

Abstract

L'invention concerne un appareil de commande d'énergie électrique, une régulation de débit d'énergie stable pouvant être effectuée lors de l'utilisation d'équipement présentant une capacité relativement petite à un coût inférieur. Un commutateur bidirectionnel magnétique à énergie régénératrice, comprenant un circuit de pont comportant deux commutateurs à semi-conducteurs à conduction inverse et un condensateur relié entre les terminaux à courant continu du circuit à pont, est relié en série entre une extrémité de transmission et une extrémité de réception d'une ligne de transmission. L'énergie magnétique de l'inductance de la ligne de transmission est régénérée et stockée dans le condensateur, et une tension pour compenser la réactance est automatiquement produite pour effectuer la compensation de la réactance, tout en augmentant l'énergie transmise. La phase de courant est avancée ou retardée. De cette manière, le débit de l'énergie est ajustée ou stabilisée.
PCT/JP2005/000432 2004-01-09 2005-01-07 Appareil pour reguler l'energie electrique WO2005067117A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
JP2004-043636 2004-01-09
JP2004043636 2004-01-09

Publications (1)

Publication Number Publication Date
WO2005067117A1 true WO2005067117A1 (fr) 2005-07-21

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Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US8482945B2 (en) 2008-09-26 2013-07-09 Merstech, Inc. Power converter with magnetic recovery switch
CN110086174A (zh) * 2018-01-26 2019-08-02 智能电线股份有限公司 电网上的优化潮流控制系统的灵活部署
US10666038B2 (en) 2017-06-30 2020-05-26 Smart Wires Inc. Modular FACTS devices with external fault current protection
US10770870B2 (en) 2018-02-22 2020-09-08 Smart Wires Inc. Containerized power flow control systems
WO2022167071A1 (fr) * 2021-02-03 2022-08-11 Hitachi Energy Switzerland Ag Unité de compensation en série et procédé de commande de puissance dans une ligne électrique

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH11127540A (ja) * 1997-07-31 1999-05-11 Mitsubishi Electric Corp 交流グリッドシステムへの無効電力の供給方法およびこの方法に用いるインバータ
JPH11299105A (ja) * 1998-04-15 1999-10-29 Mitsubishi Electric Corp 電力調相装置及び送電システム
JP2001177994A (ja) * 1999-12-15 2001-06-29 Mitsubishi Electric Corp 補償器制御装置

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH11127540A (ja) * 1997-07-31 1999-05-11 Mitsubishi Electric Corp 交流グリッドシステムへの無効電力の供給方法およびこの方法に用いるインバータ
JPH11299105A (ja) * 1998-04-15 1999-10-29 Mitsubishi Electric Corp 電力調相装置及び送電システム
JP2001177994A (ja) * 1999-12-15 2001-06-29 Mitsubishi Electric Corp 補償器制御装置

Cited By (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US8482945B2 (en) 2008-09-26 2013-07-09 Merstech, Inc. Power converter with magnetic recovery switch
US10666038B2 (en) 2017-06-30 2020-05-26 Smart Wires Inc. Modular FACTS devices with external fault current protection
US11309701B2 (en) 2017-06-30 2022-04-19 Smart Wires Inc. Modular FACTS devices with external fault current protection
US11888308B2 (en) 2017-06-30 2024-01-30 Smart Wires Inc. Modular facts devices with external fault current protection
CN110086174A (zh) * 2018-01-26 2019-08-02 智能电线股份有限公司 电网上的优化潮流控制系统的灵活部署
EP3518366A3 (fr) * 2018-01-26 2019-10-09 Smart Wires Inc. Déploiement agile de système de contrôle de flux d'énergie optimisé sur le réseau
US10756542B2 (en) 2018-01-26 2020-08-25 Smart Wires Inc. Agile deployment of optimized power flow control system on the grid
CN110086174B (zh) * 2018-01-26 2024-03-26 智能电线股份有限公司 模块化潮流控制系统
US10770870B2 (en) 2018-02-22 2020-09-08 Smart Wires Inc. Containerized power flow control systems
WO2022167071A1 (fr) * 2021-02-03 2022-08-11 Hitachi Energy Switzerland Ag Unité de compensation en série et procédé de commande de puissance dans une ligne électrique

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