CN206313442U - A kind of restraining device of second harmonic current - Google Patents
A kind of restraining device of second harmonic current Download PDFInfo
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- CN206313442U CN206313442U CN201621494622.5U CN201621494622U CN206313442U CN 206313442 U CN206313442 U CN 206313442U CN 201621494622 U CN201621494622 U CN 201621494622U CN 206313442 U CN206313442 U CN 206313442U
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- 230000000452 restraining effect Effects 0.000 title claims abstract description 12
- 230000005540 biological transmission Effects 0.000 claims abstract description 26
- 238000000034 method Methods 0.000 claims abstract description 21
- 238000001914 filtration Methods 0.000 claims abstract description 15
- 238000012935 Averaging Methods 0.000 claims abstract description 13
- 238000013016 damping Methods 0.000 claims description 7
- 230000001629 suppression Effects 0.000 claims description 7
- 230000005611 electricity Effects 0.000 claims description 6
- 230000000670 limiting effect Effects 0.000 claims description 6
- 238000010030 laminating Methods 0.000 claims description 3
- 230000035772 mutation Effects 0.000 claims description 2
- 230000005764 inhibitory process Effects 0.000 abstract description 2
- 230000002401 inhibitory effect Effects 0.000 description 4
- 238000005259 measurement Methods 0.000 description 4
- 238000010586 diagram Methods 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 230000007423 decrease Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 230000008030 elimination Effects 0.000 description 1
- 238000003379 elimination reaction Methods 0.000 description 1
- 230000002829 reductive effect Effects 0.000 description 1
Abstract
Embodiment of the present utility model provides a kind of restraining device of second harmonic current, is related to technical field of direct current power transmission, it is possible to increase inhibition of the DC transmission system to second harmonic current.The restraining device of second harmonic current includes：Method of operation judge module, for the running status according to DC transmission system, suppresses to gate one in link from K second harmonic current；The second harmonic current being strobed suppresses link, measures the DC current signal of gained in real time for receiving direct current measuring devices, carries out bandpass filtering, and carry out phase compensation according to default compensation rate；Signal averaging module, for will be added with primary current instruction by the signal of phase compensation；Trigger angle control module, for being instructed according to the Trigger Angle that converter valve is generated through the current-order of overcompensation.The utility model is used to suppress the second harmonic current in DC transmission system.
Description
Technical field
Embodiment of the present utility model is related to technical field of direct current power transmission, more particularly to a kind of suppression of second harmonic current
Device.
Background technology
In the DC transmission system based on line commutation transverter, straight-flow system both sides (rectification side and inverter side) difference
AC system is connected with, because straight-flow system and AC system have harmonic propagation phenomenon, the power frequency of typical AC system is born
Sequence harmonic voltage can produce 2 subharmonic voltages in DC side, and DC side will be in exchange by the harmonic current that 2 subharmonic voltages cause
3 positive sequence harmonic electric currents and power frequency negative sequence harmonic current are produced in system, this will further produce harmonic current.
The usual rectification side of HVDC control system is Given current controller, this kind of control be by current command signal instruction with
After measured current signal makees difference, it is connected in trigger angle control module, the Trigger Angle instruction of converter valve is ultimately formed, so as to control to change
Stream valve conducting.In the prior art, in order to suppress the second harmonic current on DC line, in the generation of rectification side Given current controller
A second harmonic current is added in current command signal and suppresses signal, by changing converter valve Trigger Angle, so as to change direct current
The input-output characteristic of control system, reaches the second harmonic damping of increase straight-flow system, reduces the purpose of second harmonic current.
In practical engineering application, the method for operation of DC transmission system may have various, typical DC operation mode
Including：Monopolar metallic return pattern, monopolar ground return pattern and double pole mode.Because system circuit is not under different running method
Together, cause inhibitory action of the scheme of the prior art to second harmonic current under a certain method of operation notable, and at it
Inhibitory action under his method of operation to second harmonic current is undesirable.
Utility model content
Embodiment of the present utility model provides a kind of restraining device of second harmonic current, it is possible to increase DC transmission system
To the inhibition of second harmonic current.
In order to reach above-mentioned purpose, embodiments herein is adopted the following technical scheme that：
A kind of restraining device of second harmonic current is provided, including：Method of operation judge module, K second harmonic current
Suppress link, Signal averaging module, and trigger angle control module, wherein K is the integer more than 1；
The method of operation judge module, for the running status according to DC transmission system, from the K second harmonic
Electric current suppresses to gate one in link；One second harmonic current suppresses link includes bandpass filtering and lead-lag compensation ring
Section；
The second harmonic current being strobed suppresses the bandpass filtering of link, is surveyed in real time for receiving direct current measuring devices
DC current signal obtained by amount, after carrying out bandpass filtering to the DC current signal, in obtaining the DC current signal
Second harmonic signal；
The second harmonic current being strobed suppresses the lead-lag compensation tache of link, with the second harmonic current being strobed
Suppress the bandpass filtering connection of link, for carrying out phase compensation to the second harmonic signal according to default compensation rate；Its
In, the compensation rate is used to increase DC transmission system second harmonic damping in the current state of operation；
The Signal averaging module, the lead-lag compensation tache for suppressing link with the second harmonic current being strobed connects
Connect, for by by being formed by current limiting low-voltage link in the second harmonic signal of phase compensation and DC control system
Primary current instruction is added, and obtains through the current-order of overcompensation；
The trigger angle control module, is connected, for according to the current-order through overcompensation with the Signal averaging module
Generate the Trigger Angle instruction of converter valve；The Trigger Angle instructs the Trigger Angle for controlling converter valve to turn on.
The second harmonic electricity of different running method is adapted in the DC transmission system that embodiment of the present utility model is provided
The restraining device of stream, in the current command signal of DC transmission system rectification side Given current controller generation, for different operations
Mode, selects additional different second harmonic current to suppress signal to change converter valve Trigger Angle, so as to change DC control system
The input-output characteristic of system, reaches for different running method increase straight-flow system second harmonic damping, reduces second harmonic electricity
The purpose of stream.
Brief description of the drawings
In order to illustrate more clearly of the utility model embodiment or technical scheme of the prior art, below will be to embodiment
The accompanying drawing to be used needed for description is briefly described, it should be apparent that, drawings in the following description are only new this practicality
Some embodiments of type, for those of ordinary skill in the art, on the premise of not paying creative work, can be with root
Other accompanying drawings are obtained according to these accompanying drawings.
Fig. 1 is DC control system rectification side Given current controller device structural representation of the prior art；
Fig. 2 is the explanation schematic diagram for suppressing link in embodiment of the present utility model to second harmonic current；
The suppression dress of the second harmonic current for DC transmission system that Fig. 3 is provided by embodiment of the present utility model
The structural representation put；
Fig. 4 is another explanation schematic diagram for suppressing link in embodiment of the present utility model to second harmonic current.
Specific embodiment
Below in conjunction with the accompanying drawing in the utility model embodiment, the technical scheme in the utility model embodiment is carried out
Clearly and completely describe, it is clear that described embodiment is only a part of embodiment of the utility model, rather than whole
Embodiment.Based on the embodiment in the utility model, those of ordinary skill in the art are not under the premise of creative work is made
The every other embodiment for being obtained, belongs to the scope of the utility model protection.
Fig. 1 is DC control system rectification side Given current controller device structural representation of the prior art, and Ud is straight for actual measurement
Stream voltage, Ido is the current-order that dispatcher gives, and current limiting low-voltage link judges whether dimension according to the DC voltage of actual measurement
Current flow instruction is held, such as occurs causing DC voltage to decline situations such as AC system voltage declines, then current limiting low-voltage link
DC current instruction will be reduced, new current command signal Iord will be generated；Id is the DC current values of actual measurement, and Iord and Id is made
After difference, difference input current is controlled into amplifier, it is corresponding tactile that the difference signal is converted into converter valve by current control amplifier
Hair angle instruction, so as to reach the purpose of control DC current.
But the method for operation of DC transmission system may have various, system circuit is different under different running method, causes
Inhibitory action of the scheme of the prior art to second harmonic current under a certain method of operation is notable, and in other operation sides
Inhibitory action under formula to second harmonic current is undesirable.
Embodiment
It is the generation of DC transmission system rectification side Given current controller in prior art basis that the purpose of this utility model is
Current command signal in, suppress signal for additional one corresponding second harmonic current of different running method, by changing
Converter valve Trigger Angle, so as to change the input-output characteristic of DC control system, increase DC transmission system is in current operation shape
Second harmonic damping under state, reaches the purpose for reducing second harmonic current.Done specifically below in conjunction with embodiments herein
It is bright.
Embodiment of the present utility model increased K second harmonic current and suppresses link on the basis of existing technology, and K is
Integer more than 1.The primary current formed by current limiting low-voltage link in DC control system is instructed, Iord is denoted as.With Idf
Represent and measure the DC current signal for obtaining by direct current measuring devices, Idf is that second harmonic current suppresses the defeated of link
Enter signal.K second harmonic current is suppressed the output signal of link, the IordK that is denoted as Iord1, Iord2 ....With reference to Fig. 2 institutes
Show, in a kind of specific embodiment, a second harmonic current suppresses link and mended including bandpass filtering 201, lead-lag
Repay link 202, signal gain link 202 and signal limiter link 204.To Idf after filtering, phase compensation, signal gain
And after signal limiter, export IordK.
Embodiment of the present utility model provides a kind of restraining device of second harmonic current, with reference to shown in Fig. 3, including：
Method of operation judge module 31, K second harmonic current suppress link 32, Signal averaging module 33, and triggering
Angle control module 34.
The quantity of DC transmission system running status represents that K is the integer more than 1, the K kinds fortune of DC transmission system with K
Row state corresponds to K second harmonic current and suppresses link respectively.Each second harmonic current suppresses link and is respectively used to be direct current
The current command signal of transmission system rectification side Given current controller generation, one second harmonic current of compensation suppresses signal, Fig. 3 institutes
The situation of K=2 is shown as, two second harmonic currents suppress link and represented with icon 32A and 32B respectively, second harmonic current suppression
The output signal of link 32A processed is Iord1, and the output signal that second harmonic current suppresses link 32B is Iord2.
Method of operation judge module 31, for the running status according to DC transmission system, from K second harmonic current suppression
One is gated in link processed 32.
Specifically, with reference to Fig. 3, the status signal that method of operation judge module 31 can be exported according to change-over switch determines direct current
The running status of transmission system.Wherein direct current change-over switch includes metallic return change-over switch and Ground return change-over switch.
Different secondary current harmonics elimination link 32 provides different compensation rates.Whenever method of operation judge module 31 determines direct current transportation
During the current running status of system, gate corresponding second harmonic current and suppress link 32, to export corresponding compensation rate.
With reference to shown in Fig. 4, a second harmonic current suppresses link 32 includes that bandpass filtering 321 and lead-lag are compensated
Link 322.IordK represents that the second harmonic current being strobed suppresses the output signal of link in Fig. 4.
The second harmonic current being strobed suppresses the bandpass filtering 321 of link 32, for receiving direct current measuring devices
The DC current signal Idf obtained by measurement, after carrying out bandpass filtering to DC current signal Idf, obtains DC current letter in real time
Second harmonic signal in number.The setting of bandpass filter scope mainly considers certain error range, it is ensured that second harmonic is produced
The second harmonic signal in DC current signal can be leached when raw.
The second harmonic current being strobed suppresses the lead-lag compensation tache 322 of link 32, secondary humorous with what is be strobed
The bandpass filtering 321 that ripple electric current suppresses link 32 is connected, for entering line phase to second harmonic signal according to default compensation rate
Compensation.Wherein, compensation rate is used to increase DC transmission system second harmonic damping in the current state of operation.
Signal averaging module 33, with the lead-lag compensation tache 322 that the second harmonic current being strobed suppresses link 32
Connection, for by by being formed by current limiting low-voltage link 35 in the second harmonic signal of phase compensation and DC control system
Primary current instruction Iord is added, and obtains through the current-order of overcompensation.
With reference to shown in Fig. 3, when the second harmonic current being strobed suppresses link 32 for second harmonic current suppression link A,
With Iord be added Iord1 by Signal averaging module 33, obtains through the current-order (Iord+Iord1) of overcompensation.When what is be strobed
When second harmonic current suppresses link 32 for second harmonic current suppression link B, number laminating module 33 will by laminating module 33
Iord2 is added with Iord, obtains through the current-order (Iord+Iord2) of overcompensation.
Trigger angle control module 34, is connected with Signal averaging module 33, for being generated according to the current-order through overcompensation
The Trigger Angle instruction of converter valve.Trigger Angle instructs the Trigger Angle for controlling converter valve to turn on.
Optionally, with reference to shown in Fig. 4, the second harmonic current being strobed suppresses link 32 also includes signal gain link
323, it is connected to lead-lag compensation tache 322 and Signal averaging module 33 that the second harmonic current being strobed suppresses link 32
Between, for by the second harmonic signal after phase compensation, by signal gain adjusting signal intensity, control compensation effect
Really.
Optionally, with reference to shown in Fig. 4, the second harmonic current being strobed suppresses link 32 also includes signal limiter link
324, be connected to the second harmonic current that is strobed suppress link 32 signal gain link 323 and Signal averaging module 33 it
Between, for by the second harmonic signal after gain-adjusted, sign mutation being eliminated by signal limiter.
The second harmonic electricity of different running method is adapted in the DC transmission system that embodiment of the present utility model is provided
The restraining device of stream, in the current command signal of DC transmission system rectification side Given current controller generation, for different operations
Mode, selects additional different second harmonic current to suppress signal to change converter valve Trigger Angle, so as to change DC control system
The input-output characteristic of system, reaches for different running method increase straight-flow system second harmonic damping, reduces second harmonic electricity
The purpose of stream.
More than, specific embodiment only of the present utility model, but protection domain of the present utility model is not limited thereto,
Any one skilled in the art can readily occur in change or replace in the technical scope that the utility model is disclosed
Change, should all cover within protection domain of the present utility model.Therefore, protection domain of the present utility model should be with claim
Protection domain is defined.
Claims (3)
1. a kind of restraining device of second harmonic current, it is characterised in that including：Method of operation judge module, K second harmonic
Electric current suppresses link, Signal averaging module, and trigger angle control module, and wherein K is the integer more than 1；
The method of operation judge module, for the running status according to DC transmission system, from the K second harmonic current
Suppress to gate one in link；One second harmonic current suppresses link includes bandpass filtering and lead-lag compensation tache；
The second harmonic current being strobed suppresses the bandpass filtering of link, and institute is measured in real time for receiving direct current measuring devices
DC current signal, after carrying out bandpass filtering to the DC current signal, obtain two in the DC current signal
Rd harmonic signal；
The second harmonic current being strobed suppresses the lead-lag compensation tache of link, suppresses with the second harmonic current being strobed
The bandpass filtering connection of link, for carrying out phase compensation to the second harmonic signal according to default compensation rate；Wherein, institute
Compensation rate is stated for increasing DC transmission system second harmonic damping in the current state of operation；
The Signal averaging module, the lead-lag compensation tache for suppressing link with the second harmonic current being strobed is connected, and uses
In by by the second harmonic signal of phase compensation and DC control system by current limiting low-voltage link formed it is original
Current-order is added, and obtains through the current-order of overcompensation；
The trigger angle control module, is connected with the Signal averaging module, for being generated according to the current-order through overcompensation
The Trigger Angle instruction of converter valve；The Trigger Angle instructs the Trigger Angle for controlling converter valve to turn on.
2. the restraining device of second harmonic current according to claim 1, it is characterised in that the second harmonic electricity being strobed
Stream suppresses link also to be included：
Signal gain link, is connected to lead-lag compensation tache and the letter that the second harmonic current being strobed suppresses link
It is strong by signal gain Regulate signal for by the second harmonic signal after phase compensation between number laminating module
Degree.
3. the restraining device of second harmonic current according to claim 1, it is characterised in that the second harmonic electricity being strobed
Stream suppresses link also to be included：
Signal limiter link, the signal gain link and the signal for being connected to the second harmonic current suppression link being strobed is folded
Plus between module, for by the second harmonic signal after gain-adjusted, sign mutation being eliminated by signal limiter.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201621494622.5U CN206313442U (en) | 2016-12-30 | 2016-12-30 | A kind of restraining device of second harmonic current |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201621494622.5U CN206313442U (en) | 2016-12-30 | 2016-12-30 | A kind of restraining device of second harmonic current |
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| Publication Number | Publication Date |
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| CN206313442U true CN206313442U (en) | 2017-07-07 |
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| CN201621494622.5U Expired - Fee Related CN206313442U (en) | 2016-12-30 | 2016-12-30 | A kind of restraining device of second harmonic current |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106786484A (en) * | 2016-12-30 | 2017-05-31 | 南方电网科学研究院有限责任公司 | The suppressing method and device of a kind of second harmonic current |
| CN112928758A (en) * | 2021-02-05 | 2021-06-08 | 国家电网有限公司 | Active damping control system and method |
| CN113884034A (en) * | 2021-09-16 | 2022-01-04 | 北方工业大学 | Radar micro-vibration target deformation quantity inversion method and device |
-
2016
- 2016-12-30 CN CN201621494622.5U patent/CN206313442U/en not_active Expired - Fee Related
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106786484A (en) * | 2016-12-30 | 2017-05-31 | 南方电网科学研究院有限责任公司 | The suppressing method and device of a kind of second harmonic current |
| CN106786484B (en) * | 2016-12-30 | 2023-09-15 | 南方电网科学研究院有限责任公司 | Method and device for suppressing second harmonic current |
| CN112928758A (en) * | 2021-02-05 | 2021-06-08 | 国家电网有限公司 | Active damping control system and method |
| CN113884034A (en) * | 2021-09-16 | 2022-01-04 | 北方工业大学 | Radar micro-vibration target deformation quantity inversion method and device |
| CN113884034B (en) * | 2021-09-16 | 2023-08-15 | 北方工业大学 | Lei Dawei vibration target deformation inversion method and device |
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Effective date of registration: 20210603 Address after: 510700 3rd, 4th and 5th floors of building J1 and 3rd floor of building J3, No.11 Kexiang Road, Science City, Luogang District, Guangzhou City, Guangdong Province Patentee after: ELECTRIC POWER Research Institute CHINA SOUTHERN POWER GRID Address before: 510080 West Tower 13-20 Floor, Shui Jungang 6 and 8 Dongfeng East Road, Yuexiu District, Guangzhou City, Guangdong Province Patentee before: ELECTRIC POWER Research Institute CHINA SOUTHERN POWER GRID Patentee before: POWER GRID TECHNOLOGY RESEARCH CENTER. CHINA SOUTHERN POWER GRID |
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Granted publication date: 20170707 |