WO2022121095A1 - Appareil de commande de courant de dégel de mini-réseau basé sur un nouveau réacteur réglable à commande magnétique, et son procédé de commande - Google Patents

Appareil de commande de courant de dégel de mini-réseau basé sur un nouveau réacteur réglable à commande magnétique, et son procédé de commande Download PDF

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WO2022121095A1
WO2022121095A1 PCT/CN2021/074089 CN2021074089W WO2022121095A1 WO 2022121095 A1 WO2022121095 A1 WO 2022121095A1 CN 2021074089 W CN2021074089 W CN 2021074089W WO 2022121095 A1 WO2022121095 A1 WO 2022121095A1
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primary winding
microgrid
current
transistor
ice
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PCT/CN2021/074089
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English (en)
Chinese (zh)
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唐小亮
杨芳
周亚兵
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广东电网有限责任公司清远供电局
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Publication of WO2022121095A1 publication Critical patent/WO2022121095A1/fr

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    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02G—INSTALLATION OF ELECTRIC CABLES OR LINES, OR OF COMBINED OPTICAL AND ELECTRIC CABLES OR LINES
    • H02G7/00—Overhead installations of electric lines or cables
    • H02G7/16—Devices for removing snow or ice from lines or cables
    • 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
    • Y02E40/30—Reactive power compensation

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  • the embodiments of the present application relate to microgrid ice melting current regulation technology, and in particular, to a microgrid ice melting current control device based on a novel magnetron adjustable reactor and a control method thereof.
  • Microgrid is a small-scale power generation, distribution, and power consumption system that has appeared and developed in recent years.
  • the ice melting effect of microgrid lines during low temperature and extreme weather directly affects the safety of microgrids, and even the safety of large power grids. Since the impact of ice disasters on power grid security in recent years, the ice melting technology of large power grids has developed rapidly, while the ice melting technology of micro grids has been developing slowly in recent years.
  • the problem of ice melting control in microgrids is much more serious than that in traditional large power grids.
  • the microgrid has a greater impact on the impedance of the line, so the ice melting current of the microgrid is more difficult to control, and the effect of ice melting is worse.
  • the AC short-circuit current ice-melting technology is the most economical and effective, but it is mainly aimed at the main network lines.
  • the distribution network lines are widely distributed, there are many branch lines, and the line shape is complex.
  • the present application provides a microgrid and microgrid ice melting current control device based on a novel magnetron adjustable reactor and a control method thereof.
  • the ice melting current control device can change the impedance parameter of the line, thereby changing the ice melting of the microgrid line. current to achieve effective ice-melting control of the microgrid.
  • the embodiment of the present application provides a micro-grid micro-grid ice melting current control device based on a novel magnetron adjustable reactor, the control device includes: an adjustable reactor, a control module and a filter module, the The regulating reactor is connected to the connection line between the microgrid and the large power grid, and the filter module is connected in parallel to the connection line between the microgrid and the large power grid;
  • the adjustable reactor includes a primary winding and a secondary winding, the primary winding is connected in series on the connection line between the micro grid and the large grid, and the secondary winding is electrically connected to the control module;
  • the control module is configured to adjust the total impedance value of the primary winding by adjusting the current following proportional coefficient of the secondary winding to follow the primary winding, so that the ice melting current value of the primary side line can be changed.
  • the current following proportionality factor is greater than the ratio of the leakage impedance of the primary winding to the excitation impedance of the primary winding.
  • the adjustable reactor further includes a voltage-type inverter circuit, and the voltage-type inverter circuit is electrically connected to the secondary winding and the control module, respectively, and the control module is used to adjust the The voltage type inverter circuit adjusts the current following proportional coefficient of the secondary winding following the primary winding.
  • the voltage source inverter circuit includes a first transistor, a second transistor, a third transistor, a fourth transistor and a voltage source, a first end of the first transistor, a first end of the second transistor is electrically connected to the positive pole of the voltage source, the second end of the first transistor is electrically connected to the first end of the third transistor and the first end of the secondary winding, respectively, the second end of the second transistor is The two terminals are respectively electrically connected to the first terminal of the fourth transistor and the second terminal of the secondary winding.
  • the second terminal of the third transistor and the second terminal of the fourth transistor are connected to the voltage source. negative electrical connection.
  • the filtering module is a passive filter.
  • a current detection module is further included, and the current detection module is electrically connected to the primary winding and the secondary winding respectively.
  • the current detection module is a current transformer.
  • the microgrid ice melting current control device is connected to the three-phase line between the microgrid and the large power grid, and each phase line is connected in series with one of the adjustable reactors, and each of the adjustable reactors. are connected to the control module.
  • the embodiments of the present application also provide a control method for a microgrid ice melting current control device based on a novel magnetron adjustable reactor.
  • the control method of the control device is executed by the ice melting current control device.
  • the ice current control device includes: an adjustable reactor and a control module, the adjustable reactor is connected to the connection line between the micro grid and the large grid; wherein, the adjustable reactor includes a primary winding and a secondary winding, The primary winding is connected in series on the connection line between the micro grid and the large grid, and the secondary winding is electrically connected to the control module;
  • the method includes:
  • the total impedance value of the primary winding is adjusted by adjusting the current following proportional coefficient of the secondary winding to follow the primary winding, thereby compensating the line impedance value and adjusting the primary side ice melting current value.
  • the adjusting the total impedance value of the primary winding by adjusting the current following proportional coefficient of the secondary winding to follow the primary winding includes:
  • the total impedance value of the primary winding is adjusted, thereby changing the primary side ice melting current value.
  • the present application provides a microgrid ice melting current control device
  • the ice melting current control device includes: an adjustable reactor, a control module and a filter module, and the adjustable reactor is connected to the connection line between the microgrid and the large power grid , the filter module is connected in parallel on the connection line between the microgrid and the large power grid;
  • the adjustable reactor includes a primary winding and a secondary winding, the primary winding is connected in series on the connection line between the microgrid and the large power grid, and the two The secondary winding is electrically connected to the control module;
  • the control module is used to adjust the total impedance value and the ice melting current value of the primary winding by adjusting the current following proportional coefficient of the secondary winding to follow the primary winding, so as to realize the ice melting effect of the microgrid.
  • Embodiment 1 is a schematic structural diagram of an ice melting current control device in Embodiment 1 of the present application;
  • Embodiment 3 is a schematic structural diagram of an ice melting current control device in Embodiment 2 of the present application.
  • Fig. 4 is the control principle diagram of a kind of ice melting current control device in the second embodiment of the present application.
  • Fig. 5 is a voltage vector diagram when the ice melting current control device is not connected in the second embodiment of the present application.
  • FIG. 6 is a schematic structural diagram of an ice melting current control device provided in Embodiment 3 of the present application.
  • the dispatched ice-melting method is mainly realized through power dispatching. Specifically, it is to change the power flow distribution in the power system and increase the current on the line with ice coating, thereby increasing the heat of the ice-coated line and making the ice-coated line melt.
  • This is actually one of the most convenient means of de-icing, however, this method has been limited by the conditions of power equipment such as transformer capacity.
  • the existing problems cannot be fundamentally solved, so this method can only be applied in the early stage of line icing, and can only play a certain mitigating role.
  • AC short-circuit ice melting method AC short-circuit ice-melting is to install the ice-melting short-circuit wire at a certain point of the transmission line, and then transmit the ice-melting current to the line through the medium-voltage power distribution device, and rely on the heat generated by the short-circuit current to melt the ice on the line.
  • the AC short-circuit ice-melting method can be divided into three-phase short-circuit ice-melting method and two-phase short-circuit ice-melting method. This method can operate normally within a certain voltage range, but for lines with a voltage level of 500kV and above, it is difficult to meet the large-capacity ice melting power supply, so this method is not feasible.
  • the method converts AC power into DC power through a converter device, and heats the ice-covered line to melt the ice-covered line.
  • the DC ice melting usually uses a 6-pulse or 12-pulse rectifier, the 6-pulse rectifier will introduce the 5th and 7th harmonics, while the 12-pulse rectifier will introduce the 11th and 13th harmonics.
  • the present application provides an ice-melting current control device and a control method thereof, through which the line leakage inductance can be compensated, and the primary-side line impedance value can be changed, thereby realizing the ice-melting current regulation of the microgrid.
  • the ice melting current control device includes: an adjustable reactor 10 , a control module 20 and a filter module 30 , the adjustable reactor 10 is connected to the connection line between the micro grid 40 and the large grid 50 , and the filter module 30 It is connected in parallel on the connection line between the micro grid 40 and the large grid 50; wherein, the adjustable reactor 10 includes a primary winding B1 and a secondary winding B2, and the primary winding B1 is connected in series between the micro grid 40 and the large grid 50.
  • the secondary winding B2 is electrically connected to the control module 20; the control module 20 is used to adjust the total impedance value of the primary winding B1 by adjusting the current following the proportional coefficient of the secondary winding B2 to follow the primary winding B1.
  • the filter module 30 is used to isolate the harmonic signal of the line. Since the adjustable reactor 10 presents a small impedance value to the fundamental wave signal, and presents a high excitation impedance value to the harmonic signal, the filter module 30 has a very good filtering effect. And can be suitable for both voltage and current harmonic sources.
  • the adjustable reactor 10 further includes a voltage-type inverter circuit 11 , and the voltage-type inverter circuit 11 is respectively connected to the secondary winding B2 and the control module 20 .
  • the control module 20 injects the output current of the voltage type inverter circuit 11 into the secondary winding side in reverse phase.
  • the control module 20 may be a single chip microcomputer.
  • the currents of the windings are i 1 and i 2 , respectively, and the voltages across the primary winding and the secondary winding are u 1 and u 2 , respectively.
  • r 1 , r 2 ' and rm respectively represent the resistance of the primary winding, the resistance of the secondary winding equivalent to the resistance value of the primary winding side and the excitation resistance;
  • L 1 ⁇ , L' 2 ⁇ and L m respectively represent the primary winding resistance
  • the leakage inductance of the winding and the leakage inductance of the secondary winding are equivalent to the inductance value of the primary winding and the excitation inductance.
  • Z 1 r 1 +jwl 1 ⁇
  • Z m r m +jwl m
  • Z 2 ′ r 2 ′+jwl 2 ⁇ ′
  • Z 1 is the leakage impedance of the primary winding
  • Z m is the excitation impedance of the primary winding.
  • the resistance value is much smaller than the inductance value.
  • the control module controls the secondary winding to follow the current change of the primary winding to generate a fundamental current by adjusting the current following proportional coefficient of the secondary winding to follow the primary winding, so as to adjust the total impedance value and current value of the primary winding.
  • K T is the turns ratio of the primary winding AX and the secondary winding ax
  • ⁇ is the current following proportional coefficient
  • the impedance presented by the primary winding is a variable, and its magnitude and ⁇ satisfy a certain proportional relationship. Therefore, by adjusting the size of the current following the proportional coefficient ⁇ , the magnetic potential of the secondary winding can be changed, thereby changing the main magnetic flux in the iron core of the transformer (the primary winding and the secondary winding can be regarded as a transformer), and the primary winding of the transformer can be An infinitely adjustable impedance will be presented.
  • the total impedance of the primary winding can be adjusted, and then the line leakage inductance can be compensated, and the microgrid line impedance and the microgrid ice melting current value can be changed.
  • the implementation process of the ice-melting current control device is: exemplarily, during adjustment, the ice-melting current control device can be set on the connection line between the microgrid 40 and the large grid 50 Specifically, the adjustable reactor 10 is connected on the connection line between the microgrid 40 and the large grid 50 , and the filter module 30 is connected in parallel on the connection line between the microgrid 40 and the large grid 50 .
  • the control module 20 adjusts the current following proportional coefficient, so that a current is generated following the current change of the primary winding and injected into the secondary winding in the reverse direction.
  • the total impedance value of the primary winding B1 can be adjusted.
  • the leakage inductance of the line can be compensated, the impedance of the micro-grid line can be changed, and the ice-melting current of the micro-grid can be changed to realize the micro-grid ice-melting control.
  • the embodiment of the present application provides an ice melting current control device, the device includes: an adjustable reactor, a control module and a filter module, the adjustable reactor is connected to the connection line between the micro grid and the large grid, and the filter modules are connected in parallel On the connection line between the microgrid and the large power grid; wherein, the adjustable reactor includes a primary winding and a secondary winding, the primary winding is connected in series on the connecting line between the microgrid and the large power grid, and the secondary winding is connected to the control module. Electrical connection; the control module is used to adjust the total impedance value of the primary winding by adjusting the current following the proportional coefficient of the secondary winding to follow the primary winding, thereby adjusting the current value. By adjusting the current following proportional coefficient, the total impedance value of the primary winding can be adjusted, and then the value of the line leakage inductance can be compensated, and the line ice-melting current value of the microgrid can be changed.
  • FIG. 3 is a schematic structural diagram of an ice melting current control device provided in Embodiment 2 of the present application.
  • the adjustable reactor 10 further includes a voltage-type inverter circuit 11, and the voltage-type inverter circuit 11 is electrically connected to the secondary winding B2 and the control module 20, respectively,
  • the control module 20 is used to adjust the current following proportional coefficient of the secondary winding B2 following the primary winding B1 by adjusting the voltage type inverter circuit 11 .
  • the control module 20 adjusts the current to follow the proportional coefficient according to the current change of the primary winding B1, so that the voltage inverter circuit 11 provides current for the secondary winding B2, and then adjusts the total impedance of the primary winding B1.
  • the voltage source inverter circuit 11 includes a first transistor Q1, a second transistor Q2, a third transistor Q3, a fourth transistor Q4 and a voltage source U d , the first end of the first transistor Q1,
  • the first end of the second transistor Q2 is electrically connected to the positive electrode of the voltage source Ud
  • the second end of the first transistor Q1 is electrically connected to the first end of the third transistor Q3 and the first end of the secondary winding B2, respectively
  • the second The second end of the transistor Q2 is electrically connected to the first end of the fourth transistor Q4 and the second end of the secondary winding B2 respectively
  • the second end of the third transistor Q3 and the second end of the fourth transistor Q4 are connected to the voltage source U d negative electrical connection.
  • the first transistor Q1, the second transistor Q2, the third transistor Q3, and the fourth transistor Q4 may be NPN transistors.
  • the control end of the first transistor Q1, the control end of the second transistor Q2, the control end of the third transistor Q3 and the control end of the fourth transistor Q4 are respectively electrically connected to the control module 20, and the control module 20 can control the first transistors Q1, The turn-on or turn-off of the second transistor Q2, the third transistor Q3, and the fourth transistor Q4 can further control the magnitude of the current provided by the voltage-source inverter circuit to the secondary winding B2.
  • the current following scaling factor is greater than the ratio of the leakage impedance of the primary winding to the excitation impedance of the primary winding.
  • the control module 20 adjusts the current to follow the proportional coefficient to satisfy: ⁇ >1+Z 1 /Z m , then the impedance value of the adjustable reactor can be set as capacitive, and its reactance value can be adjusted to be the same as the line inductive reactance value equal, the line inductance can be compensated.
  • the filtering module 30 is a passive filter.
  • the passive filter can be used to compensate the reactive power in the line, and at the same time, it can filter out the harmonics of the microgrid.
  • the ice melting current control device further includes a current detection module 60 , and the current detection module 60 is electrically connected to the primary winding B1 and the secondary winding B2 respectively.
  • the current detection module 60 is used to detect the currents of the primary winding B1 and the secondary winding B2 in real time, and send them to the control module 20 .
  • the control module 20 controls the output current of the voltage inverter circuit 11 by adjusting the current to follow the proportional coefficient according to the detected current of the primary winding B1 and injects it into the secondary winding B2, thereby adjusting the total impedance value of the primary winding to compensate the line inductance.
  • the current detection module 60 is a current transformer.
  • FIG. 4 is a control principle diagram of the ice melting current control device provided in the second embodiment of the present application
  • FIG. 5 is a flow diagram of the ice melting current control device provided in the second embodiment of the present application when the ice melting current control device is not connected.
  • the specific analysis process for compensating the power loss caused by the leakage inductance of the line is as follows: Referring to FIG. 4 , X is the line inductance value, and R is the line resistance value.
  • U m is the voltage of the micro-grid 40
  • U s is the voltage of the large grid 50
  • the phase difference between U m and U s is ⁇
  • L is the line inductance of the micro-grid.
  • the impedance value Z AX of the adjustable reactor can be set as capacitive,
  • the line inductance can be compensated by adjusting its reactance value X1 to be equal to the line inductance value X1, and the introduced compensation resistance R1 is relatively small, so the influence of its introduction can be ignored.
  • Equation (6) is the voltage vector formula of the microgrid after compensating the line impedance.
  • the line current and the voltage are in the same phase.
  • the line impedance is greatly reduced, and the ice melting current can increase in inverse proportion to the impedance.
  • the role of ice current is the voltage vector formula of the microgrid after compensating the line impedance.
  • FIG. 6 is a schematic structural diagram of a microgrid ice melting current control device provided in Embodiment 3 of the present application.
  • the ice-melting current control device is connected to the three-phase line between the microgrid 40 and the large grid 50, and an adjustable reactor is connected in series to each phase line, and each adjustable The reactors are all connected to the control module 20 .
  • the microgrid 40 includes a set of energy storage systems 41 , a set of photovoltaic power generation systems 42 , a set of conventional loads 43 and a set of harmonic source loads 44 .
  • the large grid 50 includes voltage sources, inductors, and the like.
  • the microgrid 40 and the macrogrid 50 may be connected by static switches.
  • the filter module 30 is composed of inductive elements and capacitive elements.
  • a three-phase line is connected between the microgrid 40 and the large grid 50 , each phase line is connected in series with a primary winding of an adjustable reactor, and the secondary winding of each adjustable reactor is connected to the voltage-type inverter circuit. Connection, the voltage type inverter circuit is connected to the control module 20 .
  • the control module 20 By adjusting the current following proportional coefficient of the secondary winding of each phase line by the control module 20, the secondary winding of the corresponding phase line can generate a fundamental wave current, so that the total impedance value of the primary winding of each phase line can be adjusted, In order to compensate the inductance of the entire line of the system, make it approximately 0, thereby increasing the ice melting current of the microgrid line.
  • the fourth embodiment of the present application provides a control method for a microgrid ice melting current control device.
  • This embodiment is applicable to the implementation process of the control method for the ice melting current control device, and the method can be executed by the ice melting current control device.
  • the control device includes: an adjustable reactor and a control module, and the adjustable reactor is connected to the connection line between the microgrid and the large grid; wherein the adjustable reactor includes a primary winding and a secondary winding, and the primary windings are connected in series On the connection line between the microgrid and the large grid, the secondary winding is electrically connected with the control module.
  • the control method includes the following steps:
  • Step 110 Adjust the total impedance value of the primary winding by adjusting the current following proportional coefficient of the secondary winding to follow the primary winding, thereby adjusting the magnitude of the ice melting current.
  • the control module adjusts the current following proportional coefficient, so that a current is generated following the current change of the primary winding and injected into the secondary winding in the reverse direction. Since the total impedance (or equivalent impedance) of the primary winding is related to the current following proportional coefficient, so The total impedance value of the primary winding can be adjusted, and the inductance value of the microgrid line can be compensated by adjusting the total impedance value of the primary winding, thereby adjusting the ice melting current of the microgrid.
  • the technical solution of this embodiment provides a control method of an ice-melting current control device, the control method is performed by an electric ice-melting current control device, and the micro-grid ice-melting current control device includes: an adjustable reactor, a control module and a Filter module, the adjustable reactor is connected on the connection line between the micro grid and the large grid, and the filter module is connected in parallel on the connection line between the micro grid and the large grid; wherein, the adjustable reactor includes a primary winding and a secondary winding Winding, the primary winding is connected in series on the connection line between the micro grid and the large grid, and the secondary winding is electrically connected to the control module; the control module is used to adjust the current of the secondary winding to follow the proportional coefficient of the primary winding to adjust the primary winding. total impedance value. By adjusting the current-following proportional coefficient, the total impedance value of the primary winding can be adjusted, thereby compensating the line leakage inductance and changing the ice-melting current value of the micro
  • the total impedance value of the primary winding is adjusted by adjusting the current following proportional coefficient of the secondary winding following the primary winding, thereby changing the ice melting current value of the line, including:
  • the total impedance value of the primary winding is adjusted, thereby changing the line current value.
  • the control module 20 adjusts the current to follow the proportional coefficient to satisfy: ⁇ >1+Z 1 /Z m , then the impedance value of the adjustable reactor can be set as capacitive, and its reactance value can be adjusted to be the same as the line inductive reactance value If they are equal, the line inductance can be compensated, the current value of the micro-grid melting ice can be changed, and the micro-grid ice melting control can be realized.
  • the current following scaling factor is greater than the ratio of the leakage impedance of the primary winding to the excitation impedance of the primary winding.
  • the adjustable reactor further includes a voltage-type inverter circuit, the voltage-type inverter circuit is electrically connected to the secondary winding and the control module, respectively, and the control module is used to adjust the secondary winding to follow the primary winding by adjusting the voltage-type inverter circuit.
  • the current follows the scaling factor.
  • the voltage-type inverter circuit includes a first transistor, a second transistor, a third transistor, a fourth transistor, and a voltage source, and the first end of the first transistor and the first end of the second transistor are electrically connected to the positive electrode of the voltage source.
  • the second end of the first transistor is electrically connected to the first end of the third transistor and the first end of the secondary winding respectively
  • the second end of the second transistor is respectively connected to the first end of the fourth transistor and the first end of the secondary winding
  • the second terminal is electrically connected, and the second terminal of the third transistor and the second terminal of the fourth transistor are electrically connected to the negative electrode of the voltage source.
  • the filtering module is a passive filter.
  • a current detection module is also included, and the current detection module is electrically connected to the primary winding and the secondary winding respectively.
  • the current detection module is a current transformer.
  • the ice-melting current control device is connected to the three-phase line between the microgrid and the large power grid, each phase line is connected in series with an adjustable reactor, and each adjustable reactor is connected to the control module.

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Abstract

L'invention concerne un appareil de commande de courant de dégel de mini-réseau basé sur un nouveau réacteur réglable à commande magnétique, et son procédé de commande. L'appareil de commande de courant de dégel comprend un réacteur réglable, un module de commande et un module de filtre, le réacteur réglable étant connecté à une ligne de connexion entre un mini-réseau électrique et un grand réseau électrique ; le module de filtre est connecté en parallèle à la ligne de connexion entre le mini-réseau électrique et le grand réseau électrique ; le réacteur réglable comprend un enroulement primaire et un enroulement secondaire ; l'enroulement primaire est connecté en série à la ligne de connexion entre le mini-réseau électrique et le grand réseau électrique ; l'enroulement secondaire est électriquement connecté au module de commande ; et le module de commande est utilisé pour ajuster la valeur d'impédance totale de l'enroulement primaire au moyen du réglage d'un cœfficient de proportionnalité de suivi de courant de l'enroulement secondaire après l'enroulement primaire.
PCT/CN2021/074089 2020-12-07 2021-01-28 Appareil de commande de courant de dégel de mini-réseau basé sur un nouveau réacteur réglable à commande magnétique, et son procédé de commande WO2022121095A1 (fr)

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CN202011439399.5A CN112564010B (zh) 2020-12-07 2020-12-07 一种基于磁控可调电抗器的微网融冰电流控制装置及方法

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