CN113346510A - Controllable reactive power compensation device topology based on IGCT and control method thereof - Google Patents
Controllable reactive power compensation device topology based on IGCT and control method thereof Download PDFInfo
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- CN113346510A CN113346510A CN202110171943.0A CN202110171943A CN113346510A CN 113346510 A CN113346510 A CN 113346510A CN 202110171943 A CN202110171943 A CN 202110171943A CN 113346510 A CN113346510 A CN 113346510A
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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
- H02J3/18—Arrangements for adjusting, eliminating or compensating reactive power in networks
- H02J3/1821—Arrangements for adjusting, eliminating or compensating reactive power in networks using shunt compensators
- H02J3/1835—Arrangements for adjusting, eliminating or compensating reactive power in networks using shunt compensators with stepless control
- H02J3/1842—Arrangements for adjusting, eliminating or compensating reactive power in networks using shunt compensators with stepless control wherein at least one reactive element is actively controlled by a bridge converter, e.g. active filters
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- 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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Abstract
The invention discloses a controllable reactive power compensation device topology based on IGCT and a control method thereof, wherein the device topology comprises the following steps: the device comprises a capacitance module, an inductor and a controllable module; the inductor is connected with the capacitor module in series; the capacitance module includes: the controllable capacitor unit is connected with the controllable module in parallel; the controllable module bypasses the controllable capacitor unit when the line voltage is reduced due to the fault of the alternating current transmission line so as to increase the reactive power compensation capacity of the compensation device and further stabilize the line voltage, and the controllable capacitor unit is put into the compensation device again after the fault of the alternating current transmission line disappears and the line voltage is restored to the preset upper limit value of the voltage so as to reduce the reactive power compensation capacity of the compensation device. By utilizing the full control characteristic of the IGCT, the on-off of the IGCT can be controlled, the accurate moment of inputting and cutting off the capacitor can be controlled in real time, the reactive power requirement of a power grid system is compensated in real time, and the alternating current bus voltage is stabilized.
Description
Technical Field
The invention relates to the technical field of power grid operation control, in particular to a controllable reactive power compensation device topology based on IGCT and a control method thereof.
Background
In an electric power supply system, in order to improve the safety and reliability of a power grid, a large number of reactive power compensation devices are generally required to be added. The power compensation for the transmission system is mainly to control the voltage, improve the maximum transmission capacity of the transmission network and improve the stability of the operation of the power system. The power compensation of the power distribution system mostly belongs to the compensation of loads, and mainly aims to control reactive power, improve the power factor of the loads and improve the quality of electric energy.
The common reactive power compensation mode is to adopt a thyristor switched capacitor, and the input and the removal of the capacitor are realized by controlling the conduction of a thyristor of a semi-control device; the main disadvantage of this compensation method is that the thyristor device can only control its turn-on and cannot control its turn-off (forced turn-off by external voltage), so that precise control of the compensation power cannot be achieved.
Disclosure of Invention
The invention aims to provide a controllable reactive power compensation device topology based on an IGCT (integrated gate commutated thyristor) and a control method thereof. Meanwhile, the advantages of low voltage conduction, low loss, strong di/dt resistance, large fault surge current and the like of the IGCT are fully utilized, and the reliability of the controllable reactive power compensation device is greatly improved.
To solve the above technical problem, a first aspect of an embodiment of the present invention provides a controllable reactive power compensation device topology based on an IGCT, including: the device comprises a capacitance module, an inductor and a controllable module;
the inductor is connected with the capacitor module in series;
the capacitance module includes: the controllable module comprises a fixed capacitor unit and a controllable capacitor unit which are connected in series, wherein the controllable capacitor unit is connected with the controllable module in parallel;
the controllable module bypasses the controllable capacitance unit when the line voltage is reduced due to the fault of the alternating current transmission line so as to increase the reactive power compensation capacity of the compensation device and further stabilize the line voltage, and the controllable capacitance unit is put into the compensation device again after the fault of the alternating current transmission line disappears and the line voltage is restored to the preset upper limit value of the voltage so as to reduce the reactive power compensation capacity of the compensation device.
Further, the IGCT-based controllable reactive power compensation device topology further comprises: a protection module;
the protection module is connected in parallel with the capacitance module.
Further, the controllable module comprises: and the current limiting resistor, the saturable reactor and the integrated gate commutated thyristor unit are connected in series.
Further, the gate commutated thyristor unit comprises: two sets of integrated gate commutated thyristor cells connected in anti-parallel.
Further, the IGCT is a reverse-resistance type integrated gate commutated thyristor.
Accordingly, a second aspect of the embodiments of the present invention provides a method for controlling a topology of a controllable reactive power compensation device based on an IGCT, which controls any one of the topologies of the controllable reactive power compensation device based on the IGCT, including the following steps:
acquiring line voltage of an alternating current transmission line;
judging whether the line voltage is smaller than a preset lower limit value of the voltage;
if the line voltage is smaller than the preset lower voltage limit value, bypassing the controllable capacitor unit through a controllable module to increase the reactive power compensation capacity of the compensation device so as to stabilize the line voltage;
and if the line voltage is greater than or equal to the preset voltage lower limit value, controlling the controllable module to keep the current running state.
Further, after the bypassing the controllable capacitance unit by the controllable module, the method further includes:
continuing to detect the line voltage of the alternating current transmission line;
judging whether the line voltage is greater than or equal to a preset upper limit value of the voltage;
if the line voltage is greater than or equal to the preset upper limit value of the voltage, controlling the controllable module to put the controllable capacitor unit into the controllable capacitor unit again so as to reduce the reactive power compensation capacity of the compensation device;
and if the line voltage is smaller than the preset upper limit value of the voltage, controlling the controllable module to keep the current running state.
The technical scheme of the embodiment of the invention has the following beneficial technical effects:
by utilizing the full control characteristic of the IGCT, the on-off of the IGCT can be controlled, the accurate moment of inputting and cutting off the capacitor can be controlled in real time, the reactive power requirement of a power grid system is compensated in real time, and the alternating current bus voltage is stabilized. Meanwhile, the advantages of low voltage passing reduction, low loss, strong di/dt tolerance capability, large fault surge current and the like of the IGCT are fully utilized, the reliability of the controllable reactive power compensation device is greatly improved, and the maximum transmission capability of the power transmission network and the stability of the power system are further improved.
Drawings
Fig. 1 is a schematic diagram of a topology principle of a controllable reactive power compensation device based on an IGCT according to an embodiment of the present invention;
fig. 2 is a flowchart of a topology control method for a controllable reactive power compensation device based on an IGCT according to an embodiment of the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention will be described in further detail with reference to the accompanying drawings in conjunction with the following detailed description. It should be understood that the description is intended to be exemplary only, and is not intended to limit the scope of the present invention. Moreover, in the following description, descriptions of well-known structures and techniques are omitted so as to not unnecessarily obscure the concepts of the present invention.
Fig. 1 is a schematic diagram of a topology principle of a controllable reactive power compensation device based on an IGCT according to an embodiment of the present invention.
Referring to fig. 1, a first aspect of an embodiment of the present invention provides a controllable reactive power compensation device topology based on IGCT, including: the method comprises the following steps: a capacitive module, an inductor and a controllable module. The inductor is connected in series with the capacitor module. The capacitance module includes: a fixed capacitive cell C1 and a controllable capacitive cell C2 connected in series, the controllable capacitive cell C2 being connected in parallel with the controllable module. The controllable module bypasses the controllable capacitor unit C2 when the line voltage is reduced due to the fault of the alternating current transmission line so as to increase the reactive power compensation capacity of the compensation device and further stabilize the line voltage, and the controllable capacitor unit C2 is put into the compensation device again after the fault of the alternating current transmission line disappears and the line voltage is restored to the preset upper limit value of the voltage so as to reduce the reactive power compensation capacity of the compensation device.
According to the technical scheme, the IGCT is controlled to be switched on and switched off by utilizing the full control characteristic of the IGCT, and the accurate time of inputting and cutting off the capacitor can be controlled in real time, so that the reactive power requirement of a power grid system is compensated in real time, and the voltage of the alternating current bus is stabilized. Meanwhile, the advantages of low voltage passing reduction, low loss, strong di/dt tolerance capability, large fault surge current and the like of the IGCT are fully utilized, the reliability of the controllable reactive power compensation device is greatly improved, and the maximum transmission capability of the power transmission network and the stability of the power system are further improved.
Specifically, the controllable reactive power compensation device topology based on the IGCT further includes: and a protection module. The protection module is connected in parallel with the capacitance module. When overvoltage occurs in the alternating current bus, the lightning arrester in the protection module can present low impedance characteristic, limit the overvoltage level of the bus and play a role in protecting the capacitor body, the inductor and the control module.
In a specific implementation of the embodiment of the present invention, the controllable module includes: and the current limiting resistor R, the saturable reactor L and the integrated gate commutated thyristor unit are connected in series.
Optionally, the gate commutated thyristor unit comprises: two sets of integrated gate commutated thyristor cells connected in anti-parallel.
Specifically, the IGCT is a reverse-resistance integrated gate commutated thyristor.
As shown in fig. 1, the detailed working process of the controllable reactive power compensation device topology based on IGCT is as follows:
when the power grid normally operates and the voltage of an alternating current bus is stable, the integrated gate commutated thyristor unit IGCT1 and the integrated gate commutated thyristor unit IGCT2 in the controllable module are in a locked state, and the fixed capacitor unit C1 and the controllable capacitor unit C2 are both put into the power grid system; the lightning arrester in the protection module is in a high-impedance state and does not absorb energy basically. When a fault occurs in a power grid and the voltage of an alternating current bus falls, the integrated gate commutated thyristor unit IGCT1 and the integrated gate commutated thyristor unit IGCT2 in the controllable module are controlled to be in a conducting state, the controllable capacitor unit C2 discharges to the integrated gate commutated thyristor unit IGCT through a resistor, and the voltage on the capacitor C2 can be instantly reduced to zero due to the fact that the resistance value of the current limiting resistor R is small. Meanwhile, the current-limiting resistor R can limit high-frequency oscillation between the controllable partial capacitor C2 and the control module loop stray inductance at the moment of opening the integrated gate-commutated thyristor unit IGCT, and damage to the integrated gate-commutated thyristor unit IGCT due to too high loop oscillation voltage is avoided. The saturable reactor L can limit the current rise rate of the integrated gate-commutated thyristor unit IGCT at the moment of switching on, and the safe conduction of the integrated gate-commutated thyristor unit IGCT is guaranteed. Because the integrated gate commutated thyristor unit IGCT is in a conducting state, the controllable module has the function of bypassing the controllable capacitor unit C2, and only the fixed capacitor unit C1 in the capacitor module is put into a power grid system, so that the function of increasing the reactive power compensation capacity is achieved.
When the alternating current system fault disappears and the bus voltage recovers to be stable, the controllable capacitor unit C2 can be put into the power grid again by locking the integrated gate commutated thyristor unit IGCT in the controllable module. Because the integrated gate commutated thyristor unit IGCT is a turn-off device, the switching of the controllable capacitor unit C2 can be controlled at any time, and finally the effect of accurately controlling reactive compensation is achieved.
Fig. 2 is a flowchart of a topology control method for a controllable reactive power compensation device based on an IGCT according to an embodiment of the present invention.
Accordingly, referring to fig. 2, a second aspect of the embodiment of the present invention provides a method for controlling a topology of a controllable reactive power compensation device based on an IGCT, which controls any one of the topologies of the controllable reactive power compensation device based on the IGCT, including the following steps:
and S200, acquiring the line voltage of the alternating current transmission line.
And S400, judging whether the line voltage is smaller than a preset lower limit value of the voltage.
And S600, if the line voltage is smaller than the preset lower limit value of the voltage, bypassing the controllable capacitor unit C2 through the controllable module to increase the reactive power compensation capacity of the compensation device, so as to stabilize the line voltage.
And S800, if the line voltage is greater than or equal to the preset lower limit value of the voltage, controlling the controllable module to keep the current running state.
Further, after the controllable capacitance unit C2 is bypassed by the controllable module, the method further includes:
and S710, continuously detecting the line voltage of the alternating current transmission line.
S720, judging whether the line voltage is larger than or equal to a preset upper limit value of the voltage.
And S730, if the line voltage is greater than or equal to the preset upper limit value of the voltage, controlling the controllable module to put the controllable capacitor unit C2 into the voltage converter again so as to reduce the reactive power compensation capacity of the compensation device.
And S740, if the line voltage is smaller than the preset upper limit value of the voltage, controlling the controllable module to keep the current running state.
The embodiment of the invention aims to protect a controllable reactive power compensation device topology based on IGCT and a control method thereof, and the method comprises the following steps: the device comprises a capacitance module, an inductor and a controllable module; the inductor is connected with the capacitor module in series; the capacitance module includes: the controllable capacitor unit is connected with the controllable module in parallel; the controllable module bypasses the controllable capacitor unit when the line voltage is reduced due to the fault of the alternating current transmission line so as to increase the reactive power compensation capacity of the compensation device and further stabilize the line voltage, and the controllable capacitor unit is put into the compensation device again after the fault of the alternating current transmission line disappears and the line voltage recovers to a preset value so as to reduce the reactive power compensation capacity of the compensation device. The technical scheme has the following effects:
by utilizing the full control characteristic of the IGCT, the on-off of the IGCT can be controlled, the accurate moment of inputting and cutting off the capacitor can be controlled in real time, the reactive power requirement of a power grid system is compensated in real time, and the alternating current bus voltage is stabilized. Meanwhile, the advantages of low voltage passing reduction, low loss, strong di/dt tolerance capability, large fault surge current and the like of the IGCT are fully utilized, the reliability of the controllable reactive power compensation device is greatly improved, and the maximum transmission capability of the power transmission network and the stability of the power system are further improved.
It is to be understood that the above-described embodiments of the present invention are merely illustrative of or explaining the principles of the invention and are not to be construed as limiting the invention. Therefore, any modification, equivalent replacement, improvement and the like made without departing from the spirit and scope of the present invention should be included in the protection scope of the present invention. Further, it is intended that the appended claims cover all such variations and modifications as fall within the scope and boundaries of the appended claims or the equivalents of such scope and boundaries.
Claims (7)
1. A controllable reactive power compensation device topology based on IGCT, comprising: the device comprises a capacitance module, an inductor and a controllable module;
the inductor is connected with the capacitor module in series;
the capacitance module includes: the controllable module comprises a fixed capacitor unit and a controllable capacitor unit which are connected in series, wherein the controllable capacitor unit is connected with the controllable module in parallel;
the controllable module bypasses the controllable capacitance unit when the line voltage is reduced due to the fault of the alternating current transmission line so as to increase the reactive power compensation capacity of the compensation device and further stabilize the line voltage, and the controllable capacitance unit is put into the compensation device again after the fault of the alternating current transmission line disappears and the line voltage is restored to the preset upper limit value of the voltage so as to reduce the reactive power compensation capacity of the compensation device.
2. The IGCT-based controllable reactive power compensation device topology of claim 1, further comprising: a protection module;
the protection module is connected in parallel with the capacitance module.
3. The IGCT-based controllable reactive power compensation device topology of claim 1,
the controllable module comprises: and the current limiting resistor, the saturable reactor and the integrated gate commutated thyristor unit are connected in series.
4. The IGCT-based controllable reactive power compensation device topology of claim 3,
the gate commutated thyristor unit includes: two sets of integrated gate commutated thyristor cells connected in anti-parallel.
5. The IGCT-based controllable reactive power compensation device topology according to claims 1-4,
the IGCT is a reverse resistance type integrated gate commutated thyristor.
6. A method for controlling a topology of a controllable reactive power compensation device based on an IGCT, wherein the method for controlling the topology of the controllable reactive power compensation device based on an IGCT according to any one of claims 1 to 5 comprises the following steps:
acquiring line voltage of an alternating current transmission line;
judging whether the line voltage is smaller than a preset lower limit value of the voltage;
if the line voltage is smaller than the preset lower voltage limit value, bypassing the controllable capacitor unit through a controllable module to increase the reactive power compensation capacity of the compensation device so as to stabilize the line voltage;
and if the line voltage is greater than or equal to the preset voltage lower limit value, controlling the controllable module to keep the current running state.
7. The IGCT-based controllable reactive power compensation device topology control method of claim 6, further comprising, after bypassing the controllable capacitive unit through a controllable module:
continuing to detect the line voltage of the alternating current transmission line;
judging whether the line voltage is greater than or equal to a preset upper limit value of the voltage;
if the line voltage is greater than or equal to the preset upper limit value of the voltage, controlling the controllable module to put the controllable capacitor unit into the controllable capacitor unit again so as to reduce the reactive power compensation capacity of the compensation device;
and if the line voltage is smaller than the preset upper limit value of the voltage, controlling the controllable module to keep the current running state.
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| CN202110171943.0A CN113346510A (en) | 2021-02-04 | 2021-02-04 | Controllable reactive power compensation device topology based on IGCT and control method thereof |
| PCT/CN2021/126795 WO2022166268A1 (en) | 2021-02-04 | 2021-10-27 | Igct-based controllable reactive power compensation device topology and control method therefor |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| WO2022166268A1 (en) * | 2021-02-04 | 2022-08-11 | 许继集团有限公司 | Igct-based controllable reactive power compensation device topology and control method therefor |
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| US5402058A (en) * | 1992-12-09 | 1995-03-28 | General Electric Co. | Method and apparatus for controlling discharge of a thyristor-switched capacitor |
| CN113346510A (en) * | 2021-02-04 | 2021-09-03 | 许继集团有限公司 | Controllable reactive power compensation device topology based on IGCT and control method thereof |
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- 2021-02-04 CN CN202110171943.0A patent/CN113346510A/en active Pending
- 2021-10-27 WO PCT/CN2021/126795 patent/WO2022166268A1/en active Application Filing
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| CN200947544Y (en) * | 2006-01-20 | 2007-09-12 | 李志学 | High voltage integrated adjustable capacitor type power reactive compensator |
| CN101621203A (en) * | 2008-07-02 | 2010-01-06 | 美国超导体公司 | Static var corrector |
| CN202856362U (en) * | 2012-05-09 | 2013-04-03 | 黄河科技学院 | Switching of capacitor groups in series controlled by thyristor of reactive power compensator |
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