CN206401888U - A kind of second harmonic current restraining device for DC transmission system - Google Patents
A kind of second harmonic current restraining device for DC transmission system Download PDFInfo
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- CN206401888U CN206401888U CN201621492955.4U CN201621492955U CN206401888U CN 206401888 U CN206401888 U CN 206401888U CN 201621492955 U CN201621492955 U CN 201621492955U CN 206401888 U CN206401888 U CN 206401888U
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- 230000005540 biological transmission Effects 0.000 title claims abstract description 22
- 230000000452 restraining effect Effects 0.000 title claims abstract description 18
- 238000001914 filtration Methods 0.000 claims abstract description 18
- 238000012935 Averaging Methods 0.000 claims abstract description 11
- 230000015572 biosynthetic process Effects 0.000 claims abstract description 5
- 230000035772 mutation Effects 0.000 claims description 4
- 230000005764 inhibitory process Effects 0.000 abstract description 3
- 238000013016 damping Methods 0.000 description 8
- 238000005259 measurement Methods 0.000 description 7
- 230000007423 decrease Effects 0.000 description 2
- 230000001550 time effect Effects 0.000 description 2
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- 230000003321 amplification Effects 0.000 description 1
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Abstract
Embodiment of the present utility model provides a kind of second harmonic current restraining device for DC transmission system, is related to technical field of direct current power transmission, it is possible to increase to the inhibition of second harmonic current.Second harmonic current restraining device includes：Bandpass filtering modules block, the DC current signal of gained is measured for receiving direct-current measuring device, the second harmonic signal in the DC current signal is obtained by bandpass filtering in real time；Lead-lag compensating module, for carrying out phase compensation to the second harmonic signal；Signal averaging module, for the second harmonic signal Jing Guo phase compensation to be added with the primary current instruction in DC control system by the formation of current limiting low-voltage link, obtains the current-order through overcompensation；Trigger angle control module, the Trigger Angle for generating converter valve according to the current-order through overcompensation is instructed.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 for DC transmission system
Second harmonic current restraining 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 harmonic current as caused by 2 subharmonic voltages will be in exchange
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, such a control be by current command signal instruction with
Measured current signal is made after difference, is connected in trigger angle control module, the Trigger Angle instruction of converter valve is ultimately formed, so as to control to change
Valve conducting is flowed, need to such as suppress the second harmonic current on DC line, the current-order that can be generated in rectification side Given current controller
A second harmonic current is added in signal and suppresses signal, by changing converter valve Trigger Angle, so as to change DC control system
Input-output characteristic, reach increase straight-flow system second harmonic damping, reduce the purpose of second harmonic current.
However, because measurement apparatus has certain filtering wave by prolonging time effect, resistance of the system for second harmonic may be weakened
Buddhist nun, that is, weaken the inhibition to second harmonic current.
Utility model content
Embodiment of the present utility model provides a kind of second harmonic current restraining device for DC transmission system, can
Reduce second harmonic current, that is, improve the inhibition to second harmonic current.
In order to reach above-mentioned purpose, embodiments herein provides a kind of second harmonic current for DC transmission system
Restraining device, including：
Bandpass filtering modules block, the DC current signal of gained is measured for receiving direct-current measuring device in real time, to described straight
Flow current signal and carry out bandpass filtering, obtain the second harmonic signal in the DC current signal；
Lead-lag compensating module, is connected with the bandpass filtering modules block, for according to default compensation rate to described two
Rd harmonic signal carries out phase compensation；Wherein, the compensation rate is drawn for compensating the time-lag action of the direct-current measuring device
The phase place change entered；
Signal averaging module, is connected with the lead-lag compensating module, for by by the described secondary of phase compensation
Harmonic signal is added with the primary current instruction in DC control system by the formation of current limiting low-voltage link, is obtained through overcompensation
Current-order；
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.
The second harmonic current restraining device for DC transmission system that embodiment of the present utility model is provided, for
The situation that the DC transmission system second harmonic damping that direct-current measuring device may be brought weakens, in DC transmission system rectification side
A second harmonic current is added in the current command signal of Given current controller generation and suppresses signal, is triggered by changing converter valve
Angle, so as to change the input-output characteristic of DC control system, reaches the second harmonic damping of increase straight-flow system, reduces secondary humorous
The purpose of ripple electric current.
Brief description of the drawings
, below will be to embodiment in order to illustrate more clearly of the utility model embodiment or technical scheme of the prior art
The accompanying drawing used required in description is briefly described, it should be apparent that, drawings in the following description are only that this practicality is new
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 be embodiment of the present utility model in additional second harmonic current suppress link explanation schematic diagram；
The second harmonic current restraining device for DC transmission system that Fig. 3 is provided by embodiment of the present utility model
Structural representation.
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 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
Voltage is flowed, 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, situations such as AC system voltage declines such as occur causes DC voltage to decline, then current limiting low-voltage link
Will reduction DC current instruction, the new current command signal Iord of generation.Id is the DC current values of actual measurement, and Iord and Id is made
After difference, difference is inputted into trigger angle control module, it is corresponding tactile that the difference signal is converted into converter valve by trigger angle control module
Angle instruction is sent out, so as to reach the purpose of control DC current.
There is certain filtering wave by prolonging time effect yet with measurement apparatus, the scheme of prior art may weaken system for
The damping of second harmonic.The technical scheme that the problem is solved to the application below in conjunction with specific embodiment is illustrated.
Embodiment
The purpose of this utility model is the DC transmission system second harmonic damping that may be brought for direct-current measuring device
The situation of decrease, a kind of second harmonic current restraining device is provided from DC control angle, and the device is whole in DC transmission system
Flow and a second harmonic current suppression signal is added in the current command signal of side Given current controller generation, by changing converter valve
Trigger Angle, so as to change the input-output characteristic of DC control system, reaches the second harmonic damping of increase straight-flow system, reduces two
The purpose of subharmonic current.
By the additional second harmonic current in the current command signal that DC transmission system rectification side Given current controller is generated
Suppress the process of signal, referred to as additional second harmonic current suppresses link.Embodiment of the present utility model is in prior art
On the basis of add additional second harmonic current and suppress link.
With reference to shown in Fig. 2, the primary current in DC control system by the formation of current limiting low-voltage link is instructed, is denoted as
Iord.Represent to measure the DC current signal obtained by direct-current measuring device with Idf, Idf presses down for additional second harmonic current
The input signal of link processed.Additional second harmonic current is suppressed to the output signal of link, Iord1 is denoted as.A kind of specific
In embodiment, additional second harmonic current, which suppresses link, includes bandpass filtering 201, lead-lag compensation 202, gain link
203 and amplitude limit link 204.To Idf after filtering, phase compensation, after signal gain and signal limiter, export Iord1.
With reference to shown in Fig. 3, the second harmonic current for DC transmission system that embodiment of the present utility model is provided
Restraining device, including：
Bandpass filtering modules block 301, the DC current signal Idf of gained is measured for receiving direct-current measuring device in real time, right
DC current signal carries out bandpass filtering, obtains the second harmonic signal in DC current signal.
Lead-lag compensating module 302, is connected with bandpass filtering modules block 301, for according to default compensation rate to secondary
Harmonic signal carries out phase compensation.Wherein, the compensation rate phase introduced for the time-lag action of compensating direct current measurement apparatus becomes
Change.
Signal averaging module 303, is connected with lead-lag compensating module 302, for by by the secondary humorous of phase compensation
Ripple signal with DC control system by current limiting low-voltage link 304 formation primary current instruction Iord be added, obtain by
The current-order (Iord+Iord1) of compensation.
Trigger angle control module 305, is connected with Signal averaging module 303, for being given birth to according to the current-order through overcompensation
Trigger Angle into converter valve is instructed.Trigger Angle instructs the Trigger Angle for controlling converter valve to turn on.
Optionally, second harmonic current restraining device also includes signal gain module 306, is connected to lead-lag compensation mould
Between block 302 and Signal averaging module 303, for the second harmonic signal after phase compensation, being adjusted by signal gain
Save signal intensity.
Optionally, second harmonic current restraining device also includes signal limiter module 307, is connected to signal gain module
Between 306 and Signal averaging module 303, for the second harmonic signal after gain-adjusted, being eliminated by signal limiter
Sign mutation.
The function of second harmonic current restraining device is described further below in conjunction with Fig. 3.
Idf signals are accessed into bandpass filtering modules block 301, bandpass filtering modules block 301 includes bandpass filter, bandpass filter
The setting of scope mainly considers certain error range, it is ensured that two in DC current signal can be filtered out during second_harmonic generation
Rd harmonic signal.
The second harmonic signal of output is filtered by pass filtering module 301, access lead-lag compensating module 302 is used to
Compensate because of the phase place change that the time-lag action of direct-current measuring device is brought.The phase compensation amount of lead-lag compensating module 302 can
The phase place change brought according to the time-lag action of direct-current measuring device is specifically set.
Optionally, can be strong and weak by the appropriate Regulate signal of signal gain module 306 after gain link, control is mended
Repay effect.It is further alternative, in order to prevent sign mutation caused by signal measurement error, signal limiter module 307 can be passed through
Eliminate sign mutation.
After Iord1 signals are obtained, Iord1 is added with Iord, the current-order through overcompensation of output is denoted as
(Iord+Iord1).Compensation rate Iord1, compensate for because of the phase place change that the time-lag action of direct-current measuring device is brought.
Further, (Iord+Iord1) and Id are made poor, difference input current is controlled into amplifier, current control amplification
The difference signal is converted into the corresponding Trigger Angle of converter valve and instructed by device, so as to reach the purpose of control DC current.
The second harmonic current restraining device for DC transmission system that embodiment of the present utility model is provided, for
The situation that the DC transmission system second harmonic damping that direct-current measuring device may be brought weakens, in DC transmission system rectification side
A second harmonic current is added in the current command signal of Given current controller generation and suppresses signal, is triggered by changing converter valve
Angle, so as to change the input-output characteristic of DC control system, reaches the second harmonic damping of increase straight-flow system, reduces secondary humorous
The purpose of ripple electric current.
More than, 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 second harmonic current restraining device for DC transmission system, it is characterised in that including：
Bandpass filtering modules block, the DC current signal of gained is measured for receiving direct-current measuring device, to the direct current in real time
Flow signal and carry out bandpass filtering, obtain the second harmonic signal in the DC current signal；
Lead-lag compensating module, is connected with the bandpass filtering modules block, for according to default compensation rate to described secondary humorous
Ripple signal carries out phase compensation；Wherein, the compensation rate is introduced for the time-lag action for compensating the direct-current measuring device
Phase place change；
Signal averaging module, is connected with the lead-lag compensating module, for by the second harmonic Jing Guo phase compensation
Signal is added with the primary current instruction in DC control system by the formation of current limiting low-voltage link, obtains the electric current through overcompensation
Instruction；
Trigger angle control module, is connected with the Signal averaging module, for generating the change of current according to the current-order through overcompensation
The Trigger Angle instruction of valve；The Trigger Angle instructs the Trigger Angle for controlling converter valve to turn on.
2. second harmonic current restraining device according to claim 1, it is characterised in that also include：
Signal gain module, is connected between the lead-lag compensating module and the Signal averaging module, for passing through
The second harmonic signal after phase compensation, passes through signal gain adjusting signal intensity.
3. second harmonic current restraining device according to claim 2, it is characterised in that also include：
Signal limiter module, is connected between the signal gain module and the Signal averaging module, for passing through gain
The second harmonic signal after regulation, sign mutation is eliminated by signal limiter.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201621492955.4U CN206401888U (en) | 2016-12-30 | 2016-12-30 | A kind of second harmonic current restraining device for DC transmission system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201621492955.4U CN206401888U (en) | 2016-12-30 | 2016-12-30 | A kind of second harmonic current restraining device for DC transmission system |
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| CN206401888U true CN206401888U (en) | 2017-08-11 |
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| CN201621492955.4U Expired - Fee Related CN206401888U (en) | 2016-12-30 | 2016-12-30 | A kind of second harmonic current restraining device for DC transmission system |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106532678A (en) * | 2016-12-30 | 2017-03-22 | 南方电网科学研究院有限责任公司 | Secondary harmonic current suppression method and device for direct current transmission system |
-
2016
- 2016-12-30 CN CN201621492955.4U patent/CN206401888U/en not_active Expired - Fee Related
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106532678A (en) * | 2016-12-30 | 2017-03-22 | 南方电网科学研究院有限责任公司 | Secondary harmonic current suppression method and device for direct current transmission system |
| CN106532678B (en) * | 2016-12-30 | 2023-11-07 | 南方电网科学研究院有限责任公司 | Second harmonic current suppression method and device for direct current transmission system |
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Effective date of registration: 20210608 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: 20170811 |
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