CN106992527A - The adjusting method and system of voltage pulsation during alternating current filter group switching - Google Patents
The adjusting method and system of voltage pulsation during alternating current filter group switching Download PDFInfo
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- CN106992527A CN106992527A CN201710367870.6A CN201710367870A CN106992527A CN 106992527 A CN106992527 A CN 106992527A CN 201710367870 A CN201710367870 A CN 201710367870A CN 106992527 A CN106992527 A CN 106992527A
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- 238000000034 method Methods 0.000 title claims abstract description 59
- 230000010349 pulsation Effects 0.000 title abstract 2
- 230000001052 transient effect Effects 0.000 claims abstract description 135
- 230000001276 controlling effect Effects 0.000 claims abstract description 84
- 230000001105 regulatory effect Effects 0.000 claims abstract description 16
- 230000033228 biological regulation Effects 0.000 claims description 49
- 230000005540 biological transmission Effects 0.000 claims description 29
- 230000008569 process Effects 0.000 claims description 23
- 230000007423 decrease Effects 0.000 claims description 16
- 238000012544 monitoring process Methods 0.000 claims description 12
- 230000003750 conditioning effect Effects 0.000 claims description 2
- 238000006243 chemical reaction Methods 0.000 abstract 3
- 238000010521 absorption reaction Methods 0.000 abstract 1
- 238000010586 diagram Methods 0.000 description 7
- 230000008859 change Effects 0.000 description 5
- 230000000087 stabilizing effect Effects 0.000 description 5
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- 238000001914 filtration Methods 0.000 description 2
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Classifications
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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
- H02J3/12—Circuit arrangements for ac mains or ac distribution networks for adjusting voltage in ac networks by changing a characteristic of the network load
- H02J3/16—Circuit arrangements for ac mains or ac distribution networks for adjusting voltage in ac networks by changing a characteristic of the network load by adjustment of reactive power
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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
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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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- Supply And Distribution Of Alternating Current (AREA)
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Abstract
This application discloses the regulating system and method for voltage pulsation during a kind of alternating current filter group switching, regulating system includes AC power；It is connected to the current conversion station bus of AC power；It is connected to the alternating current filter group of current conversion station bus；And the switching control device being connected with alternating current filter group；The throwing being connected with switching control device/cut signal picker, in real time gather throw/cut control signal；With throwing/cutting the reactive compensation controlling device that signal picker is connected, for when throwing/cutting the signal that control signal puts into for control alternating current filter group, control reactive power compensator to reduce the reactive compensation power of output or increase absorption；Or when the signal for control cut-out, control reactive power compensator increase exports or reduced the reactive compensation power absorbed；And the reactive power compensator being connected with reactive compensation controlling device, for being exported to current conversion station bus or absorbing reactive compensation power.The technical scheme of the application can stabilize transient voltage fluctuation.
Description
Technical Field
The application relates to the field of power systems, in particular to a method and a system for adjusting voltage fluctuation in the switching process of an alternating current filter group.
Background
Dc transmission systems typically include a dc converter station for converting ac power to dc power for dc powering of electrical equipment. As shown in fig. 1, the dc converter station generally includes an ac power supply 1, a converter station bus 2 connected to the ac power supply 1, an ac filter group 3 connected to the converter station bus 2, a switching control device 4 electrically connected to the ac filter group 3, a converter transformer 5 connected to the converter station bus 2, and a converter 6.
The alternating current filter group 3 is used for filtering and reactive compensation processing of the current on the current transformation station bus 2 before the alternating current is transformed into the direct current. In the process of filtering and reactive compensation of alternating current, reactive change can be caused by switching of the alternating current filter group 3, so that voltage fluctuation on a bus 2 of the converter station is caused, and normal power supply of the whole direct current transmission system is further influenced. In order to suppress reactive power change caused by switching of the ac filter group 3, in the prior art, a reactive power compensation device is generally additionally installed on the converter station bus 2, and the reactive power compensation device is connected to the converter station bus 2, so that a certain amount of reactive power compensation power is absorbed or output from the converter station bus 2 after switching of the ac filter group 3 is completed and the voltage of the converter station bus 2 enters a steady state, thereby stabilizing steady-state voltage fluctuation caused by switching of the ac filter group 3.
However, in the prior art, only the fluctuation of the bus voltage after the switching is finished can be stabilized, the switching process of the alternating current filter group (including the alternating current filter or the capacitor) is too short, and the reactive power compensation device is difficult to track the instantaneous voltage fluctuation in real time, so that the reactive power compensation device is difficult to output effective dynamic reactive power in time, and further the transient voltage fluctuation on the bus of the converter station is too large, which causes damage to the stable operation of the direct current power supply system.
Disclosure of Invention
The application provides a method and a system for adjusting voltage fluctuation in the switching process of an alternating current filter group, which aim to solve the problem that transient voltage fluctuation on a bus of a converter station is difficult to stabilize in the prior art.
In a first aspect, the application provides a system for regulating voltage fluctuation in the switching process of an alternating current filter group, which comprises an alternating current power supply; a converter station bus connected to the AC power source; the alternating current filter group is connected to the bus of the converter station; the switching control device is electrically connected with the alternating current filter group and is used for sending switching control signals to the alternating current filter group;
the conditioning system further comprises: the switching signal collector is electrically connected with the switching control device and is used for collecting switching control signals sent to the alternating current filter group by the switching control device in real time;
the reactive compensation control device is electrically connected with the switching signal collector and is used for controlling the reactive compensation device to reduce the reactive compensation power transmitted to or absorbed from the bus of the converter station according to a preset regulation fluctuation range of the transient voltage on the bus of the converter station when the switching control signal is a signal for controlling the switching of the alternating current filter group, or controlling the reactive compensation device to increase the reactive compensation power transmitted to or absorbed from the bus of the converter station according to a preset regulation fluctuation range of the transient voltage on the bus of the converter station when the switching control signal is a signal for controlling the switching-off of the alternating current filter group so as to stabilize the transient voltage on the bus of the converter station; and the reactive compensation device is electrically connected with the reactive compensation control device and is used for outputting reactive compensation power to the converter station bus or absorbing reactive compensation power from the converter station bus.
With reference to the first aspect, in a first optional implementation manner of the first aspect, the reactive compensation control apparatus includes:
the first input reactive compensation control sub-device is electrically connected with the input/output signal collector and the reactive compensation device and is used for controlling the reactive compensation device to gradually reduce the transmission direction or increase the reactive compensation power absorbed from the bus of the converter station according to a preset regulation fluctuation range of the transient voltage on the bus of the converter station according to a first preset time until a preset minimum reactive compensation power value is reached, wherein the first preset time is less than or equal to the time from the time when the input/output control signal is sent to the time when the input/output of the alternating current filter group starts to be input/output;
the second input reactive compensation control sub-device is electrically connected with the reactive compensation device and is used for controlling the reactive compensation device to gradually increase the reactive compensation power transmitted to or reduced from the bus of the converter station according to second preset time until the initial steady-state reactive compensation power value is reached;
the first switching-off reactive compensation control sub-device is respectively and electrically connected with the switching-on/switching-off signal collector and the reactive compensation device and is used for controlling the reactive compensation device to gradually increase or decrease the reactive compensation power absorbed from the bus of the converter station according to a first preset time according to a preset regulation fluctuation range of the transient voltage on the bus of the converter station until a preset maximum reactive compensation power value is reached;
and the second cut-off reactive compensation control sub-device is electrically connected with the reactive compensation device and is used for controlling the reactive compensation device to gradually reduce the transmission direction or increase the reactive compensation power absorbed from the bus of the converter station according to second preset time until the initial steady-state reactive compensation power value is reached.
With reference to the first aspect, in a second optional implementation manner of the first aspect, the reactive compensation control apparatus further includes:
the maximum transient voltage fluctuation value calculation module is used for calculating a maximum transient voltage fluctuation value caused by switching of the alternating current filter group according to the power capacity of the alternating current filter group and the short circuit capacity of the bus of the converter station;
and the reactive compensation power range determining module is electrically connected with the maximum transient voltage fluctuation value calculating module and is used for determining a preset reactive compensation adjusting range of the reactive compensation power according to the maximum transient voltage fluctuation value, a preset adjusting fluctuation range and the short circuit capacity of the bus of the converter station.
With reference to the first aspect, in a third alternative embodiment of the first aspect, the adjustment system further comprises:
the transient voltage collector is connected with the bus of the converter station and is used for monitoring a transient voltage fluctuation value caused by switching of the alternating current filter group in real time;
the reactive compensation control device is also electrically connected with the transient voltage collector and used for controlling the reactive compensation device to adjust the output or absorbed reactive compensation power in real time according to the monitored transient voltage fluctuation value and the preset adjustment fluctuation range.
With reference to the first aspect, in a fourth optional implementation manner of the first aspect, the reactive power compensation apparatus further includes:
the steady-state voltage collector is connected with the converter station bus and used for collecting a steady-state voltage fluctuation value on the converter station bus in real time;
the reactive compensation control device is also electrically connected with the steady-state voltage collector and used for controlling the reactive compensation device to adjust the reactive compensation power absorbed or transmitted to the bus of the converter station according to the steady-state voltage fluctuation value and the preset allowable fluctuation range where the steady-state voltage fluctuation value is located so as to adjust the steady-state voltage fluctuation value.
In a second aspect, the present application provides a method for adjusting voltage fluctuation in a switching process of an ac filter group, where the method is used for a dc converter station, where the dc converter station includes an ac power supply, a converter station bus connected to the ac power supply, an ac filter group connected to the converter station bus, a switching control device electrically connected to the ac filter group, and a reactive power compensation device connected to the converter station bus; the voltage fluctuation adjusting method comprises the following steps:
monitoring switching control signals sent to the alternating current filter group by the switching control device in real time, wherein the switching control signals are used for controlling the alternating current filter group to be switched on or switched off;
when the switching control signal is monitored to be a signal for controlling the switching of the alternating current filter group, controlling the reactive power compensation device to reduce the transmission direction or increase the reactive power absorbed from the bus of the converter station according to the preset regulation fluctuation range of the transient voltage on the bus of the converter station so as to stabilize the transient voltage on the bus of the converter station;
and when the switching control signal is monitored to be a signal for controlling the AC filter group to be switched off, controlling the reactive power compensation device to increase or decrease the reactive power absorbed from the bus of the converter station according to the preset regulation fluctuation range of the transient voltage on the bus of the converter station so as to stabilize the transient voltage on the bus of the converter station.
With reference to the second aspect, in a first optional implementation manner of the second aspect, the controlling the reactive power compensation device to reduce the reactive power transmitted to or absorbed from the converter station bus according to the preset regulation fluctuation range of the transient voltage on the converter station bus includes:
controlling the reactive power compensation device to gradually reduce the reactive power transmitted to or absorbed from the bus of the converter station according to a first preset time until a preset minimum reactive power compensation power value according to a preset regulation fluctuation range of the transient voltage on the bus of the converter station, wherein the first preset time is less than or equal to the time from sending a switching control signal to starting switching of the alternating current filter group;
when the preset minimum reactive power compensation power value is reached, controlling the reactive power compensation device to gradually increase the reactive power transmitted to or reduced from the bus of the converter station according to a second preset time until the initial steady-state reactive power compensation power value is reached;
and controlling the reactive power compensation device to increase the transmission direction or decrease the reactive power compensation power absorbed from the bus of the converter station according to the preset regulation fluctuation range of the transient voltage on the bus of the converter station, wherein the reactive power compensation device comprises:
controlling the reactive power compensation device to gradually increase the transmission direction or decrease the reactive power compensation power absorbed from the bus of the converter station according to a first preset time until a maximum reactive power compensation power value is preset according to a preset regulation fluctuation range of the transient voltage on the bus of the converter station;
and when the preset maximum reactive power compensation power value is reached, controlling the reactive power compensation device to gradually reduce the reactive power absorbed from the bus of the converter station or increase the reactive power absorbed from the bus of the converter station according to a second preset time until the initial steady-state reactive power compensation power value is reached.
With reference to the second aspect, in a second optional implementation manner of the second aspect, the method further includes:
calculating a maximum transient voltage fluctuation value caused by switching of the alternating current filter group according to the power capacity of the alternating current filter group and the short circuit capacity of the bus of the converter station;
and calculating the preset reactive compensation adjustment range of the reactive compensation power according to the maximum transient voltage fluctuation value, the preset adjustment fluctuation range and the short circuit capacity of the bus of the converter station.
With reference to the second aspect, in a third alternative embodiment of the second aspect, the method further comprises:
monitoring transient voltage fluctuation values caused by switching of an alternating current filter group in real time;
and controlling the reactive compensation device to adjust the output or absorbed reactive compensation power in real time according to the monitored transient voltage fluctuation value and the preset adjustment fluctuation range.
With reference to the second aspect, in a fourth alternative embodiment of the second aspect, the method further comprises:
monitoring a steady-state voltage fluctuation value on a bus of the converter station in real time;
and controlling the reactive power compensation device to adjust the reactive power compensation power absorbed or transmitted to the bus of the converter station according to the steady-state voltage fluctuation value and the preset allowable fluctuation range of the steady-state voltage fluctuation value so as to adjust the magnitude of the steady-state voltage fluctuation value.
According to the technical scheme, the regulation scheme for voltage fluctuation in the switching process of the alternating current filter group is characterized in that switching control signals sent to the alternating current filter group by a switching control device are collected in real time through a switching signal collector, then when the switching control signals are determined to be signals for controlling the switching of the alternating current filter group by a reactive compensation control device, the reactive compensation device is controlled to reduce the transmission direction or increase the reactive compensation power absorbed from a bus of a converter station according to the preset regulation fluctuation range of transient voltage on the bus of the converter station, or when the switching control signals are determined to be signals for controlling the switching of the alternating current filter group, the reactive compensation device is controlled to increase the transmission direction or reduce the reactive compensation power absorbed from the bus of the converter station according to the preset regulation fluctuation range of the transient voltage on the bus of the converter station, and the reactive compensation device absorbs or absorbs the reactive compensation power from the bus of the converter station or transmits the reactive compensation power to the bus of the converter And the bus outputs reactive compensation power. The regulating system can control the reactive compensation device to regulate the reactive compensation power transmitted to or absorbed from the bus of the converter station according to the preset regulation fluctuation range of the transient voltage on the bus of the converter station when the switching control device sends a switching signal, namely before the AC filter group starts switching, so that the effect of stabilizing the transient voltage on the bus of the converter station can be achieved.
Drawings
In order to more clearly explain the technical solution of the present application, the drawings needed to be used in the embodiments will be briefly described below, and it is obvious to those skilled in the art that other drawings can be obtained according to the drawings without any creative effort.
Fig. 1 is a schematic structural diagram of a dc converter station provided in the prior art;
fig. 2 is a schematic structural diagram of a voltage fluctuation adjustment system in the switching process of a first ac filter group according to an embodiment of the present application;
fig. 3 is a schematic structural diagram of a voltage fluctuation adjustment system in the switching process of a second ac filter group according to an embodiment of the present application;
fig. 4 is a schematic diagram illustrating a change of reactive compensation power in a commissioning process of an ac filter bank according to an embodiment of the present application;
fig. 5 is a schematic diagram illustrating a change of reactive compensation power during a group switching-off process of an ac filter provided in an embodiment of the present application;
fig. 6 is a schematic structural diagram of a voltage fluctuation adjustment system in the switching process of the third ac filter group according to the embodiment of the present application;
fig. 7 is a schematic flowchart of a method for adjusting voltage fluctuation during switching of a first ac filter bank according to an embodiment of the present application;
fig. 8 is a schematic flow chart of a reactive compensation power adjustment method provided in the embodiment shown in fig. 7;
fig. 9 is a schematic flowchart of a second method for adjusting voltage fluctuation during switching of an ac filter bank according to an embodiment of the present application;
fig. 10 is a schematic flowchart of a method for adjusting voltage fluctuation during switching of a third ac filter bank according to an embodiment of the present application;
fig. 11 is a schematic flowchart of a method for adjusting voltage fluctuation in a switching process of a fourth ac filter group according to an embodiment of the present application.
The correspondence between the structures and reference numerals in the embodiment shown in fig. 1 to 11 is as follows:
the system comprises a 1-alternating current power supply, a 2-converter station bus, a 3-alternating current filter group, a 4-switching control device, a 5-converter transformer, a 6-converter, a 7-switching/switching signal collector, an 8-reactive compensation control device, an 81-first switching reactive compensation control sub-device, an 82-second switching reactive compensation control sub-device, an 83-first switching reactive compensation control sub-device, an 84-second switching reactive compensation control sub-device, an 85-maximum transient voltage fluctuation value calculation module, an 86-reactive compensation power range determination module, a 9-reactive compensation device, a 10-transient voltage collector and an 11-steady-state voltage collector.
Detailed Description
Referring to fig. 2, a schematic structural diagram of a system for adjusting voltage fluctuation during switching of a first ac filter bank provided in the embodiment of the present application is shown. As shown in fig. 2, the system for regulating voltage fluctuation during switching of the ac filter bank includes:
an alternating current power supply 1; a converter station bus 2 connected to an ac power supply 1; an AC filter group 3 connected to the converter station bus 2; the switching control device 4 is electrically connected with the alternating current filter group 3 and is used for sending switching control signals to the alternating current filter group 3; this part of the structure is the same as the structure of the converter station shown in fig. 1. The ac power supply 1 outputs ac power through a converter station bus bar 2, and the converter station bus bar 2 is also connected with an ac-dc converter (not shown) and an electric device electrically connected with the ac-dc converter. The switching control device 4 is electrically connected with the alternating current filter group 3 and can control the alternating current filter group 3 to perform switching work, so that current on the bus 2 of the converter station is filtered and reactive compensation is performed.
The problem that transient voltage fluctuation is overlarge due to the fact that an effective dynamic reactive power is difficult to output in time by a reactive compensation device 9 because the switching process of an existing alternating current filter group 3 is too short and the reactive compensation device 9 is difficult to track instantaneous voltage fluctuation in real time is solved. The voltage fluctuation adjusting system provided by the embodiment of the application further comprises:
and the switching signal collector 7 is electrically connected with the switching control device 4, and the switching signal collector 7 can collect switching control signals sent to the alternating current filter group 3 by the switching control device 4 in real time.
The switching signal collector 7 collects switching control signals sent by the switching control device 4 to the alternating current filter group 3 in real time, and can accurately determine the switching time of the switching control device 4 for controlling the alternating current filter group 3, so that the voltage on the bus 2 of the converter station can be regulated and controlled before the alternating current filter group 3 is switched. Specifically, the switching signal collector 7 may be installed on a control line between the switching control device 4 and the ac filter bank 3.
The reactive compensation control device 8 is electrically connected with the throw/cut signal collector 7, the reactive compensation control device 8 can firstly quickly judge whether the throw/cut control signal is a signal for controlling the throw of the filter group or a signal for controlling the cut-off of the filter group, then after the specific content of the throw/cut control signal is determined, the voltage on the bus 2 of the converter station is controlled in a targeted mode, and when the voltage is controlled, the throw/cut operation of the alternating current filter group 3 is not executed, so that the voltage can be regulated in advance by the regulating system, the voltage fluctuation caused by the throw/cut of the alternating current filter group 3 is neutralized, and the voltage fluctuation on the bus 2 of the converter station is controlled within a preset range.
The reactive compensation control device 8 is used for controlling the reactive compensation device 9 to reduce the transmission direction or increase the reactive compensation power absorbed from the converter station bus 2 according to the preset regulation fluctuation range of the transient voltage on the converter station bus 2 when the switching control signal is a signal for controlling the switching of the alternating current filter group 3. When the input operation of the AC filter group 3 causes the voltage amplitude on the converter station bus 2 to be increased, and when the input/cut control signal is determined to be the signal for controlling the input of the AC filter group 3, namely before the AC filter group 3 is input, the reactive power compensation device 9 is controlled in advance to reduce the transmission direction or increase the reactive power absorbed from the converter station bus 2, so that the voltage amplitude on the converter station bus 2 caused by the input of the AC filter group 3 can be prevented from being increased. And further, the fluctuation of the transient voltage on the bus 2 of the converter station is stabilized, and the transient voltage on the bus 2 of the converter station is controlled to be stabilized in a preset regulation fluctuation range.
Or, when the switching control signal is a signal for controlling the ac filter group 3 to switch off, the reactive power compensation device 9 is controlled to increase or decrease the reactive power absorbed from the converter station bus 2 according to the preset regulation fluctuation range of the transient voltage on the converter station bus 2, so as to stabilize the transient voltage on the converter station bus 2. When the switching-off operation of the alternating current filter subgroup 3 causes the voltage amplitude on the converter station bus 2 to be reduced, and the reactive compensation device 9 determines that the switching-on/off control signal is a signal for controlling the switching-off of the alternating current filter subgroup 3, namely before the alternating current filter subgroup 3 is not switched off, the reactive compensation device 9 is controlled to increase the reactive compensation power transmitted to or absorbed from the converter station bus 2 in advance, so that the fluctuation of the transient voltage on the converter station bus 2 can be stabilized, and the transient voltage on the converter station bus 2 is controlled to be stabilized within a preset regulation fluctuation range.
And a reactive compensation device 9 electrically connected to the reactive compensation control device 8 for outputting reactive compensation power to the station bus 2 or absorbing reactive compensation power from the station bus 2. The reactive power compensation device 9 may be configured as a STATCOM (static synchronous Compensator).
Because the regulating system can control the reactive power compensation device 9 to regulate the reactive power transmitted to or absorbed from the bus 2 of the converter station according to the preset regulation fluctuation range of the transient voltage on the bus 2 of the converter station when the switching control device 4 sends a switching signal, namely before the switching of the alternating current filter group 3 is started, the effect of stabilizing the transient voltage on the bus 2 of the converter station can be achieved.
The adjustment of the voltage fluctuation on the converter station bus 2 by the reactive compensation control device 8 is a long-term process with a certain time, and after the voltage fluctuation on the converter station bus 2 is adjusted by the reactive compensation device 9, the voltage on the converter station bus 2 is finally controlled to reach a stable state, and at the moment, the voltage absorbed or output by the reactive compensation device 9 also keeps stable. Therefore, in order to realize the above functions, as shown in fig. 3, the reactive compensation control device in the embodiment shown in fig. 2 further includes:
and the first input reactive compensation control sub-device 81 is respectively and electrically connected with the input/output signal collector 7 and the reactive compensation device 9 and is used for controlling the reactive compensation device 9 to gradually reduce the reactive compensation power transmitted to or increased from the bus 2 of the converter station according to a preset regulation fluctuation range of the transient voltage on the bus 2 of the converter station according to a first preset time until a preset minimum reactive compensation power value is reached, wherein the first preset time is less than or equal to the time for starting input/output from the time when the input/output control signal is sent to the AC filter group 3.
When the alternating current filter group 3 is put into use, the transient voltage amplitude on the bus 2 of the converter station can be increased, before the alternating current filter group 3 is actually put into use, the first input reactive compensation control sub-device 81 controls the reactive compensation device 9 to gradually reduce the reactive compensation power transmitted to or absorbed from the bus 2 of the converter station according to the first preset time, the amplitude of the transient voltage can be adjusted to be low in advance, and the transient voltage of the alternating current filter group 3 is increased due to the input. And the first input reactive compensation control sub-device 81 controls the reactive compensation device 9 to gradually adjust the reactive compensation power according to the first preset time, so that the huge fluctuation of the transient voltage caused by the excessively high adjusting speed and the excessively large amplitude can be avoided. The preset minimum reactive compensation power value is calculated according to a preset regulation fluctuation range of the transient voltage on the converter station bus 2, and when the reactive compensation device 9 reduces the transmission direction or increases the absorbed reactive compensation power to the preset minimum reactive compensation power value, the transient voltage of the converter station bus 2 reaches or approaches the voltage minimum value allowed by the preset regulation fluctuation range.
And a second input reactive compensation control sub-device 82 electrically connected with the reactive compensation device 9 and used for controlling the reactive compensation device 9 to gradually increase the reactive compensation power transmitted to or reduced from the bus 2 of the converter station according to a second preset time when the preset minimum reactive compensation power value is reached until the initial steady state reactive compensation power value.
The second input reactive compensation control sub-device 82 controls the reactive compensation device 9 to gradually increase the reactive compensation power transmitted to or reduced from the converter station bus 2 according to a second preset time until the initial steady-state reactive compensation power value; the fluctuations in the transient voltage caused by the ac filter subgroup 3 can be gradually opposed. In addition, since there are often a plurality of ac filter subgroups, the second preset time may be set according to the time interval between the two filter subgroups.
As a preferred embodiment, as shown in fig. 4, in the embodiment shown in fig. 4, the reactive power compensation device 9 adopts a STATCOM reactive power compensation device, and when the ac filter sub-group 3 is not switched in, the STATCOM stably outputs a steady-state reactive power Qs to stabilize steady-state voltage fluctuation on the bus bar 2 of the converter station. When receiving a switching control signal sent by the switching control device 4 at a time t1, the reactive compensation control device 8 controls the reactive compensation device 9 to gradually reduce the output reactive compensation power, the amplitude of the reduced output reactive compensation power is recorded as delta Q, and the pre-adjusted reactive power Qc1 is reached after the time delta t 1; under the action of the pre-regulation, the alternating bus voltage is slightly adjusted downwards, but does not exceed the preset regulation fluctuation range. Wherein Δ t1 is less than or equal to the time from the switching control device 4 sending the switching control signal to the ac filter bank 3 starting switching. When the alternating current filter group 3 is put into use, the voltage of the bus 2 of the converter station is already in a down-regulation state, so that the voltage which is instantly increased when the alternating current filter group is put into use is stabilized. When the preset reactive power Qc1 is reached, the reactive compensation control device 8 controls the reactive compensation device 9 to gradually increase the output reactive compensation power until reaching the steady-state reactive power Qs after the time delta t 2.
And a first switching-off reactive power compensation control sub-device 83 electrically connected with the switching signal collector 7 and the reactive power compensation device 9 and used for controlling the reactive power compensation device 9 to gradually increase or decrease the reactive power compensation power absorbed from the bus 2 of the converter station according to a first preset time according to a preset regulation fluctuation range of the transient voltage on the bus 2 of the converter station until a preset maximum reactive power compensation power value is reached.
Before the ac filter group 3 is actually cut off, the first cut-off reactive compensation control sub-device 83 controls the reactive compensation device 9 to gradually increase or decrease the reactive compensation power absorbed from the converter station bus 2 according to the first preset time, so that the amplitude of the transient voltage can be increased in advance, and the transient voltage of the ac filter group 3 is increased due to the cut-off. And the first cut-off reactive compensation control sub-device 83 controls the reactive compensation device 9 to gradually adjust the reactive compensation power according to the first preset time, so that the huge fluctuation of the transient voltage caused by the excessively high adjusting speed and the excessively large amplitude can be avoided. The preset maximum reactive compensation power value is calculated according to a preset regulation fluctuation range of the transient voltage on the converter station bus 2, and when the reactive compensation device 9 increases the transmission or decreases the absorbed reactive compensation power to the preset maximum reactive compensation power value, the transient voltage of the converter station bus 2 reaches or approaches the maximum voltage value allowed by the preset regulation fluctuation range.
And a second cut-off reactive compensation control sub-means 84 for controlling the reactive compensation means 9 to gradually decrease the transmission or increase the reactive compensation power absorbed from the converter station bus 2 to an initial steady-state reactive compensation power value according to a second preset time when the preset maximum reactive compensation power value is reached.
The second cut-off reactive compensation control sub-device 84 controls the reactive compensation device 9 to gradually reduce the reactive compensation power absorbed from the bus 2 of the converter station to the initial steady-state reactive compensation power value according to a second preset time; the fluctuations in the transient voltage caused by the ac filter subgroup 3 can be gradually opposed.
As an embodiment, as shown in fig. 5, in the embodiment shown in fig. 5, the reactive power compensation device 9 adopts a STATCOM reactive power compensation device, and when the ac filter subgroup 3 is not switched off, the STATCOM stably outputs a steady-state reactive power Qs to stabilize steady-state voltage fluctuation on the converter station bus 2. When a cut-off control signal sent by the switching control device 4 is received at the time t4, the reactive compensation control device 8 controls the reactive compensation device 9 to gradually increase the output reactive compensation power, the amplitude of the increased output reactive compensation power is recorded as delta Q, and the preset reactive power Qc2 is reached after the time delta t 1; under the action of the pre-regulation, the alternating bus voltage is slightly adjusted upwards, but does not exceed the preset regulation fluctuation range. Wherein Δ t1 is less than or equal to the time from the switching control device 4 sending the switching control signal to the ac filter bank 3 starting switching. Since the voltage of the converter station bus 2 is already in the up-regulated state when the ac filter subgroup 3 is cut off, the voltage drop at the moment of cutting off will be stabilized. When the pre-adjusted reactive power Qc2 is reached, i.e. t5, the reactive compensation control device 8 controls the reactive compensation device 9 to gradually reduce the output reactive compensation power until reaching the steady-state reactive power Qs after the time Δ t 2.
The transient voltage on the bus bar 2 of the converter station has a range of allowable fluctuation, that is, a maximum transient voltage fluctuation value exists, and the transient voltage on the bus bar 2 of the converter station cannot be regulated by the regulating system in the embodiment of the present invention beyond the maximum transient voltage fluctuation value. In order to achieve the above object, as shown in fig. 6, in the regulation system provided in the present embodiment, the reactive compensation control device 8 further includes:
and the maximum transient voltage fluctuation value calculating module 85 is used for calculating the maximum transient voltage fluctuation value caused by switching on/off of the alternating current filter subgroup 3 according to the power capacity of the alternating current filter subgroup 3 and the short circuit capacity of the converter station bus 2.
The maximum transient voltage fluctuation value is calculated according to the power capacity of the alternating current filter subgroup 3 and the short-circuit capacity of the bus 2 of the converter station, and the specific calculation formula is as follows:where Δ Q is the capacity of the AC filter subgroup 3, SdIs the short circuit capacity of the converter station bus bar 2. That is, the commutation bus voltage Δ U1 will change each time Δ Q is reactive
And a reactive compensation power range determining module 86 electrically connected to the maximum transient voltage fluctuation value calculating module 85, configured to determine a preset reactive compensation adjustment range of the reactive compensation power according to the maximum transient voltage fluctuation value, the preset adjustment fluctuation range, and the short circuit capacity of the converter station bus 2.
From the above formula, the reactive power compensation device 9 preconditions the reactive power Δ QstWill cause the voltage of the commutation bus to changeFor example, the voltage variation should not exceed a maximum voltage fluctuation value, such as 2% of the per-unit value of the bus voltage of the converter station, i.e. the voltage variation is controlled by the converter stationNamely, Delta Qst＜Sd×2％*Up.u. Wherein, is Δ QstThe size of the reactive power generated by the reactive power compensation device 9 (such as a static synchronous compensator STATCOM) can be flexibly set; and Δ Q refers to the capacity of the ac filter subgroup 3, the value of which is fixed; u shapep.uIs the voltage per-unit value of the bus of the converter station. Normally, the pre-adjusted reactive power Δ Q of the reactive power compensation device 9 is due to the fact that the capacity Δ Q of the ac filter subgroup 3 is small, which causes a small amplitude of voltage fluctuations of the converter station bus 2st＜Sd×2％*Up.uThen the method is finished; but also even ifPreconditioning reactive delta QstThe voltage fluctuation of the converter station bus 2 cannot be completely controlled within the preset fluctuation range even when the maximum value is reached, and at the moment, alarm or other processing can be carried out to reduce the voltage fluctuation amplitude.
In addition, in order to accurately adjust the voltage fluctuation on the bus bar 2 of the converter station in real time, as a preferred embodiment, as shown in fig. 2, the adjustment system provided by this embodiment further includes:
and the transient voltage collector 10 is connected to the bus 2 of the converter station and is used for monitoring the transient voltage fluctuation value caused by switching of the alternating current filter group 3 in real time.
The reactive compensation control device 8 is further electrically connected with the transient voltage collector 10, and is configured to control the reactive compensation device 9 to adjust the output or absorbed reactive compensation power in real time according to the monitored transient voltage fluctuation value and a preset adjustment fluctuation range.
The transient voltage collector 10 connected to the converter station bus 2 is arranged, so that the transient voltage fluctuation value caused by switching/switching of the alternating current filter group 3 can be monitored in real time, the transient voltage fluctuation value on the converter station bus 2 caused by switching/switching of the alternating current filter group 3 can be monitored in real time, and the reactive compensation is controlled to adjust the output or absorbed reactive compensation power in real time according to the transient voltage fluctuation value and the preset adjustment fluctuation range required to be adjusted. So that the fluctuations of the transient voltage on the bus bar 2 of the converter station can be adjusted quickly and in time.
In addition, as shown in fig. 2, as a preferred embodiment, the reactive power compensation device 9 further includes:
and the steady-state voltage collector 11 is connected to the converter station bus 2 and is used for collecting the steady-state voltage fluctuation value on the converter station bus 2 in real time.
The reactive compensation control device 8 is also electrically connected with the steady-state voltage collector 11 and is used for controlling the reactive compensation device 9 to adjust the reactive compensation power absorbed or transmitted to the bus 2 of the converter station according to the steady-state voltage fluctuation value and the preset allowable fluctuation range where the steady-state voltage fluctuation value is located so as to adjust the steady-state voltage fluctuation value.
The steady-state voltage fluctuation value on the bus 2 of the converter station is collected through the steady-state voltage collector 11 connected to the bus 2 of the converter station, so that the reactive compensation control device 8 can control the reactive compensation device 9 to adjust the absorbed or output reactive compensation power according to the steady-state voltage fluctuation value and a preset allowable fluctuation range, and the voltage fluctuation value of the bus 2 of the converter station is timely and accurately adjusted when the voltage is in a steady state.
Based on the same application concept, the embodiment of the invention also provides an embodiment of a voltage fluctuation adjusting method in the switching process of the alternating current filter group.
Referring to fig. 7, a schematic flow chart of a method for adjusting voltage fluctuation during switching of an ac filter group provided in an embodiment of the present application is shown, where the method is applied to a dc converter station shown in fig. 1, where the dc converter station includes an ac power source, a converter station bus connected to the ac power source, an ac filter group connected to the converter station bus, a switching control device electrically connected to the ac filter group, and a reactive power compensation device connected to the converter station bus; as shown in fig. 7, the voltage fluctuation adjustment method includes:
s110: and the real-time monitoring switching control device sends switching control signals to the alternating current filter group, and the switching control signals are used for controlling the switching-in or switching-off of the alternating current filter group.
S120: and judging whether the switching control signal is a signal for controlling the switching of the AC filter group or a signal for controlling the switching of the AC filter group.
S130: and when the switching control signal is monitored to be a signal for controlling the switching of the alternating current filter group, controlling the reactive power compensation device to reduce the transmission direction or increase the reactive power absorbed from the bus of the converter station according to the preset regulation fluctuation range of the transient voltage on the bus of the converter station so as to stabilize the transient voltage on the bus of the converter station.
S140: and when the switching control signal is a signal for controlling the AC filter group to switch off, controlling the reactive power compensation device to increase the transmission direction or reduce the reactive power compensation power absorbed from the bus of the converter station according to the preset regulation fluctuation range of the transient voltage on the bus of the converter station so as to stabilize the transient voltage on the bus of the converter station.
According to the voltage fluctuation adjusting method in the switching process of the alternating current filter group, the switching control signal sent to the alternating current filter group by the switching control device is acquired in real time through the switching signal acquisition device, then the reactive compensation control device controls the reactive compensation device to reduce the transmission direction or increase the reactive compensation power absorbed from the bus of the converter station according to the preset adjusting fluctuation range of the transient voltage on the bus of the converter station when the switching control signal is determined to be a signal for controlling the switching of the alternating current filter group, or controls the reactive compensation device to increase the transmission direction or reduce the reactive compensation power absorbed from the bus of the converter station according to the preset adjusting fluctuation range of the transient voltage on the bus of the converter station when the switching control signal is determined to be a signal for controlling the switching of the alternating current filter group, and the reactive compensation device absorbs or absorbs the reactive compensation power from the bus of the converter station or transmits the reactive compensation power to the bus of the converter station after receiving the control signal of the reactive And the line outputs reactive compensation power. The regulating system can control the reactive compensation device to regulate the reactive compensation power transmitted to or absorbed from the bus of the converter station according to the preset regulation fluctuation range of the transient voltage on the bus of the converter station when the switching control device sends a switching signal, namely before the AC filter group starts switching, so that the effect of stabilizing the transient voltage on the bus of the converter station can be achieved.
As shown in fig. 8, step S130 in the embodiment shown in fig. 7: controlling the reactive power compensation device to reduce the transmission direction or increase the reactive power absorbed from the bus of the converter station according to the preset regulation fluctuation range of the transient voltage on the bus of the converter station, and the method comprises the following steps:
s210: according to the preset regulation fluctuation range of the transient voltage on the bus of the converter station, controlling the reactive power compensation device to gradually reduce the reactive power absorbed from the bus of the converter station according to a first preset time until a preset minimum reactive power compensation power value is reached, wherein the first preset time is less than or equal to the time from the sending of the switching control signal to the switching of the alternating current filter group.
The amplitude of the transient voltage on the bus of the converter station can be increased when the alternating current filter group is put into operation, and before the alternating current filter group 3 is actually put into operation, the amplitude of the transient voltage can be reduced in advance by controlling the reactive compensation device to gradually reduce the reactive compensation power transmitted to or increased from the bus of the converter station according to the first preset time, so that the transient voltage of the alternating current filter group caused by the input can be increased. And by controlling the reactive compensation device to gradually adjust the reactive compensation power according to the first preset time, the large fluctuation of the transient voltage caused by the over-high adjusting speed and the over-large amplitude can be avoided. The preset minimum reactive compensation power value is calculated according to a preset regulation fluctuation range of the transient voltage on the bus of the converter station, and when the reactive compensation device reduces the transmission direction or increases the absorbed reactive compensation power to the preset minimum reactive compensation power value, the transient voltage of the bus 2 of the converter station reaches or approaches the voltage minimum value allowed by the preset regulation fluctuation range.
S220: and when the preset minimum reactive power compensation power value is reached, controlling the reactive power compensation device to gradually increase the reactive power transmitted to or reduced from the bus of the converter station according to a second preset time until the initial steady-state reactive power compensation power value.
Controlling the reactive power compensation device to gradually increase or decrease the reactive power absorbed from the bus of the converter station according to a second preset time until an initial steady-state reactive power compensation power value; the fluctuations in the transient voltage caused by the small group of ac filters can be gradually opposed. In addition, since there are often a plurality of ac filter subgroups, the second preset time may be set according to the time interval between the two filter subgroups.
And, step S130: controlling the reactive power compensation device to increase the transmission direction or decrease the reactive power absorbed from the bus of the converter station according to the preset regulation fluctuation range of the transient voltage on the bus of the converter station, and the method comprises the following steps:
s310: according to the preset regulation fluctuation range of the transient voltage on the bus of the converter station, controlling the reactive power compensation device to gradually increase the reactive power transmitted to or reduced from the bus of the converter station according to the first preset time until the maximum reactive power compensation power value is preset.
S320: and when the preset maximum reactive power compensation power value is reached, controlling the reactive power compensation device to gradually reduce the transmission direction or increase the reactive power absorbed from the bus of the converter station according to a second preset time until the initial steady-state reactive power compensation power value is reached.
Controlling the reactive compensation device according to a second preset time to gradually reduce the reactive compensation power transmitted to or absorbed from the bus of the converter station until the initial steady-state reactive compensation power value is reached; the fluctuations in the transient voltage caused by the small group of ac filters can be gradually opposed.
As shown in fig. 9, as a preferred embodiment, the adjusting method in the embodiment shown in fig. 7 further includes:
s410: and calculating the maximum transient voltage fluctuation value caused by switching of the alternating current filter group according to the power capacity of the alternating current filter group and the short circuit capacity of the bus of the converter station.
S420: and calculating the preset reactive compensation adjusting range of the reactive compensation power according to the maximum transient voltage fluctuation value, the preset adjusting fluctuation range and the short circuit capacity of the bus of the converter station.
As shown in fig. 10, as a preferred embodiment, the adjusting method in the embodiment shown in fig. 7 further includes the following steps:
s510: and monitoring the transient voltage fluctuation value caused by switching of the alternating current filter group in real time.
S520: and controlling the reactive compensation device to adjust the output or absorbed reactive compensation power in real time according to the monitored transient voltage fluctuation value and a preset adjustment fluctuation range.
The transient voltage fluctuation value caused by switching/switching of the alternating current filter group can be monitored in real time, the fluctuation of the transient voltage on the bus of the converter station caused by switching/switching of the alternating current filter group can be monitored in real time, and then the output or absorbed reactive compensation power can be adjusted in real time according to the transient voltage fluctuation value and the preset adjustment fluctuation range required to be adjusted, so that the fluctuation of the transient voltage on the bus of the converter station can be adjusted timely and quickly.
In order to effectively regulate the steady-state voltage fluctuation value on the bus bar of the converter station, as a preferred embodiment, the regulating method in the embodiment shown in fig. 6 further comprises the following steps: and monitoring the steady-state voltage fluctuation value on the bus of the converter station in real time. And controlling the reactive compensation device to adjust the reactive compensation power absorbed or transmitted to the bus of the converter station according to the steady-state voltage fluctuation value and the preset allowable fluctuation range of the steady-state voltage fluctuation value so as to adjust the steady-state voltage fluctuation value.
As a preferred embodiment, fig. 11 is a flowchart of a voltage fluctuation method in the switching process of the fourth ac filter bank provided in the embodiment of the present application. As shown in fig. 11, the voltage fluctuation method in the switching process of the ac filter bank includes the following steps:
s601: the switching control device sends switching control signals to the alternating current filter group.
S602: the ac filter bank performs a cast/cut operation.
S603: the STATCOM device collects and receives the projection/and control signals.
S604: the STATCOM device pre-adjusts and stabilizes transient reactive power mutation.
S605: the ac filter bank switches/switches to produce transient voltage fluctuations.
S606: the transient voltage fluctuation is stabilized, and the transient voltage is controlled within a preset adjusting range to meet the requirement.
S607: the converter station bus generates steady-state reactive fluctuation.
S608: the STATCOM device collects steady-state reactive power fluctuation on the bus of the converter station and performs reactive power compensation on the bus of the converter station.
S609: the steady state voltage of the ac system fluctuates.
S610: the steady state voltage fluctuation meets the requirement.
Because the switching process of the alternating current filter group is too short, the measurement system of the STATCOM device cannot track the instantaneous voltage fluctuation in real time, so that the reactive compensation control device of the STATCOM device cannot timely and effectively output dynamic reactive power. The STATCOM device immediately sends out a reactive power preconditioning instruction after receiving the signal, and absorbs/sends out a certain amount of reverse reactive power in advance. When the AC filter group finishes switching action, because the bus voltage is reversely regulated by a certain amount in advance, the deviation of the transient voltage and the steady-state voltage caused by switching can be reduced, and the purpose of stabilizing the transient voltage fluctuation is achieved.
The same and similar parts in the various embodiments in this specification may be referred to each other. In particular, as for the method embodiment, since it is substantially similar to the system embodiment, the description is simple, and the relevant points can be referred to the description in the system embodiment.
The above-described embodiments of the present invention should not be construed as limiting the scope of the present invention.
Claims (10)
1. A voltage fluctuation regulating system in the switching process of an alternating current filter group is characterized by comprising an alternating current power supply; a converter station bus connected to the AC power source; the alternating current filter group is connected to the bus of the converter station; the switching control device is electrically connected with the alternating current filter group and is used for sending switching control signals to the alternating current filter group;
the conditioning system further comprises: the system comprises a switching/cutting signal collector, a reactive compensation control device and a reactive compensation device; wherein,
the switching signal collector is electrically connected with the switching control device and is used for collecting switching control signals sent to the alternating current filter group by the switching control device in real time;
the reactive compensation control device is electrically connected with the switching signal collector and is used for controlling the reactive compensation device to reduce the reactive compensation power transmitted to or absorbed from the bus of the converter station according to a preset regulation fluctuation range of the transient voltage on the bus of the converter station when the switching control signal is a signal for controlling the switching of the alternating current filter group, or controlling the reactive compensation device to increase the reactive compensation power transmitted to or absorbed from the bus of the converter station according to a preset regulation fluctuation range of the transient voltage on the bus of the converter station when the switching control signal is a signal for controlling the switching-off of the alternating current filter group so as to stabilize the transient voltage on the bus of the converter station;
and the reactive compensation device is electrically connected with the reactive compensation control device and is used for outputting reactive compensation power to the converter station bus or absorbing reactive compensation power from the converter station bus.
2. The system of claim 1, wherein the reactive compensation control means comprises:
the first input reactive compensation control sub-device is respectively and electrically connected with the input/output signal collector and the reactive compensation device and is used for controlling the reactive compensation device to gradually reduce the transmission direction or increase the reactive compensation power absorbed from the bus of the converter station according to a preset regulation fluctuation range of the transient voltage on the bus of the converter station according to a first preset time until a preset minimum reactive compensation power value is reached, wherein the first preset time is less than or equal to the time from the time when the input/output control signal is sent to the time when the input/output of the alternating current filter group starts to be switched;
a second input reactive compensation control sub-device electrically connected with the reactive compensation device and used for controlling the reactive compensation device to gradually increase the transmission direction or decrease the transmission direction from the reactive compensation device according to a second preset time when the preset minimum reactive compensation power value is reached
Reactive compensation power absorbed by a bus of the converter station is up to an initial steady-state reactive compensation power value;
and the number of the first and second groups,
the first switching-off reactive power compensation control sub-device is respectively and electrically connected with the switching-on/switching-off signal collector and the reactive power compensation device and is used for controlling the reactive power compensation device to gradually increase or decrease reactive power compensation power absorbed from the bus of the converter station according to a preset regulation fluctuation range of transient voltage on the bus of the converter station and a first preset time until a maximum reactive power compensation power value is preset;
and the second cut-off reactive compensation control sub-device is electrically connected with the reactive compensation device and is used for controlling the reactive compensation device to gradually reduce the reactive compensation power transmitted to or increased from the bus of the converter station according to second preset time until the initial steady-state reactive compensation power value is reached.
3. The system of claim 1, wherein the reactive compensation control device comprises:
the maximum transient voltage fluctuation value calculation module is used for calculating a maximum transient voltage fluctuation value caused by switching of the alternating current filter group according to the power capacity of the alternating current filter group and the short circuit capacity of the bus of the converter station;
and the reactive compensation power range determining module is electrically connected with the maximum transient voltage fluctuation value calculating module and is used for determining a preset reactive compensation adjusting range of the reactive compensation power according to the maximum transient voltage fluctuation value, a preset adjusting fluctuation range and the short circuit capacity of the bus of the converter station.
4. The system of claim 1, further comprising:
the transient voltage collector is connected with the bus of the converter station and is used for monitoring a transient voltage fluctuation value caused by switching of the alternating current filter group in real time;
the reactive compensation control device is also electrically connected with the transient voltage collector and used for controlling the reactive compensation device to adjust the output or absorbed reactive compensation power in real time according to the monitored transient voltage fluctuation value and the preset adjustment fluctuation range.
5. The system of claim 1, wherein the reactive compensation device further comprises:
the steady-state voltage collector is connected with the converter station bus and used for collecting a steady-state voltage fluctuation value on the converter station bus in real time;
the reactive compensation control device is also electrically connected with the steady-state voltage collector and used for controlling the reactive compensation device to adjust the reactive compensation power absorbed or transmitted to the bus of the converter station according to the steady-state voltage fluctuation value and the preset allowable fluctuation range where the steady-state voltage fluctuation value is located so as to adjust the steady-state voltage fluctuation value.
6. A method for adjusting voltage fluctuation in the switching process of an alternating current filter group is characterized by being used for a direct current converter station, wherein the direct current converter station comprises an alternating current power supply, a converter station bus connected with the alternating current power supply, the alternating current filter group connected with the converter station bus, a switching control device electrically connected with the alternating current filter group, and a reactive power compensation device connected with the converter station bus; the voltage fluctuation adjusting method comprises the following steps:
monitoring switching control signals sent to the alternating current filter group by the switching control device in real time, wherein the switching control signals are used for controlling the alternating current filter group to be switched on or switched off;
when the switching control signal is monitored to be a signal for controlling the switching of the alternating current filter group, controlling the reactive power compensation device to reduce the transmission direction or increase the reactive power absorbed from the bus of the converter station according to the preset regulation fluctuation range of the transient voltage on the bus of the converter station so as to stabilize the transient voltage on the bus of the converter station;
and when the switching control signal is monitored to be a signal for controlling the AC filter group to be switched off, controlling the reactive power compensation device to increase or decrease the reactive power absorbed from the bus of the converter station according to the preset regulation fluctuation range of the transient voltage on the bus of the converter station so as to stabilize the transient voltage on the bus of the converter station.
7. The method of claim 6,
the step of controlling the reactive power compensation device to reduce the transmission direction or increase the reactive power compensation power absorbed from the bus of the converter station according to the preset regulation fluctuation range of the transient voltage on the bus of the converter station comprises the following steps:
controlling the reactive power compensation device to gradually reduce the reactive power transmitted to or absorbed from the bus of the converter station according to a first preset time until a preset minimum reactive power compensation power value according to a preset regulation fluctuation range of the transient voltage on the bus of the converter station, wherein the first preset time is less than or equal to the time from sending a switching control signal to starting switching of the alternating current filter group;
when the preset minimum reactive power compensation power value is reached, controlling the reactive power compensation device to gradually increase the reactive power transmitted to or reduced from the bus of the converter station according to a second preset time until the initial steady-state reactive power compensation power value is reached;
and the number of the first and second groups,
the step of controlling the reactive power compensation device to increase the transmission direction or decrease the reactive power compensation power absorbed from the bus of the converter station according to the preset regulation fluctuation range of the transient voltage on the bus of the converter station comprises the following steps:
controlling the reactive power compensation device to gradually increase the transmission direction or decrease the reactive power compensation power absorbed from the bus of the converter station according to a first preset time until a maximum reactive power compensation power value is preset according to a preset regulation fluctuation range of the transient voltage on the bus of the converter station;
and when the preset maximum reactive power compensation power value is reached, controlling the reactive power compensation device to gradually reduce the reactive power absorbed from the bus of the converter station or increase the reactive power absorbed from the bus of the converter station according to a second preset time until the initial steady-state reactive power compensation power value is reached.
8. The method of claim 6, further comprising:
calculating a maximum transient voltage fluctuation value caused by switching of the alternating current filter group according to the power capacity of the alternating current filter group and the short circuit capacity of the bus of the converter station;
and calculating the preset reactive compensation adjustment range of the reactive compensation power according to the maximum transient voltage fluctuation value, the preset adjustment fluctuation range and the short circuit capacity of the bus of the converter station.
9. The method of claim 6, further comprising:
monitoring transient voltage fluctuation values caused by switching of an alternating current filter group in real time;
and controlling the reactive compensation device to adjust the output or absorbed reactive compensation power in real time according to the monitored transient voltage fluctuation value and the preset adjustment fluctuation range.
10. The method of claim 6, further comprising:
monitoring a steady-state voltage fluctuation value on a bus of the converter station in real time;
and controlling the reactive power compensation device to adjust the reactive power compensation power absorbed or transmitted to the bus of the converter station according to the steady-state voltage fluctuation value and the preset allowable fluctuation range of the steady-state voltage fluctuation value so as to adjust the magnitude of the steady-state voltage fluctuation value.
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| CN107681680A (en) * | 2017-10-16 | 2018-02-09 | 云南电网有限责任公司电力科学研究院 | A kind of method of voltage pulsation during reduction alternating current filter group switching |
| CN109462240A (en) * | 2018-11-15 | 2019-03-12 | 许继电气股份有限公司 | A kind of reactive coordination control method and device of extra-high voltage direct-current layer-specific access |
| CN111884230A (en) * | 2020-07-02 | 2020-11-03 | 南方电网科学研究院有限责任公司 | Method and device for reducing bus voltage fluctuation in switching process of alternating current filter bank |
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107681680A (en) * | 2017-10-16 | 2018-02-09 | 云南电网有限责任公司电力科学研究院 | A kind of method of voltage pulsation during reduction alternating current filter group switching |
| CN107681680B (en) * | 2017-10-16 | 2021-02-26 | 云南电网有限责任公司电力科学研究院 | Method for reducing voltage fluctuation in switching process of alternating current filter bank |
| CN109462240A (en) * | 2018-11-15 | 2019-03-12 | 许继电气股份有限公司 | A kind of reactive coordination control method and device of extra-high voltage direct-current layer-specific access |
| CN109462240B (en) * | 2018-11-15 | 2023-03-17 | 许继电气股份有限公司 | Reactive power coordination control method and device for extra-high voltage direct current layered access |
| CN111884230A (en) * | 2020-07-02 | 2020-11-03 | 南方电网科学研究院有限责任公司 | Method and device for reducing bus voltage fluctuation in switching process of alternating current filter bank |
| CN111884230B (en) * | 2020-07-02 | 2022-02-22 | 南方电网科学研究院有限责任公司 | Method and device for reducing bus voltage fluctuation in switching process of alternating current filter bank |
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