CN107404124A - Suppress the method and system of higher hamonic wave in flexible DC power transmission - Google Patents
Suppress the method and system of higher hamonic wave in flexible DC power transmission Download PDFInfo
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- CN107404124A CN107404124A CN201710546469.9A CN201710546469A CN107404124A CN 107404124 A CN107404124 A CN 107404124A CN 201710546469 A CN201710546469 A CN 201710546469A CN 107404124 A CN107404124 A CN 107404124A
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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
- H02J3/36—Arrangements for transfer of electric power between ac networks via a high-tension dc link
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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
- H02J3/36—Arrangements for transfer of electric power between ac networks via a high-tension dc link
- H02J2003/365—Reducing harmonics or oscillations in HVDC
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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
- Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
- Y02E60/60—Arrangements for transfer of electric power between AC networks or generators via a high voltage DC link [HVCD]
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Abstract
The present invention relates to a kind of method and system for suppressing higher hamonic wave in flexible DC power transmission, including：Obtain MMC net sides reference current signal, MMC current on line side signal and MMC voltage on line side signals；To MMC net sides reference current signal and MMC current on line side signal difference PI processing, the first MMC valve side modulated voltage signal is obtained；Park is converted, and obtains dq coordinates MMC voltage on line side signal and LPF；According to the difference of the dq coordinate MMC voltage on line side signals after the first MMC valve side modulated voltage signal and LPF, the second MMC valve side modulated voltage signal is obtained；According to the difference of the second MMC valve side modulated voltage signal and MMC voltage on line side signals, final voltage on valve side modulated signal is obtained；Final net side actual current signal is obtained according to final voltage on valve side modulated signal.The present invention feeds back the MMC voltage on line side signal after LPF as signal, interference of the harmonic carcellation to MMC current on line side signals.
Description
Technical field
The present invention relates to power system technical field of electric power transmission, more particularly to a kind of side for suppressing flexible transmission higher hamonic wave
Method and system.
Background technology
Flexible DC power transmission (Voltage Source Converter based High Voltage Direct
Current Transmission, VSC-HVDC) it is that one kind is adjusted with voltage source converter (VSC), controllable shut-off device and pulsewidth
Make the VSC-HVDC technology based on (PWM technologies).Flexible DC power transmission has obtained quickly because of its a variety of transmission of electricity advantage
Development and application.Modular multi-level converter (Modular Multilevel Converter, MMC) is voltage source converter
Type DC transmission system is most competitive, most application prospect converter topology.Because its manufacture difficulty is small, low, ripple is lost
Form quality amount is high, can be powered to passive network, and MMC is widely used in flexible DC power transmission.
All-controlling power electronics device is used in flexible DC power transmission, frequency is very high, during flexible transmission under weak pattern system
Easily cause system voltage, the electric current higher-order of oscillation, produce higher hamonic wave (higher hamonic wave is easily produced i.e. in switching process), this
A little higher hamonic waves can make system produce overcurrent and overvoltage, so as to cause the damage of all-controlling power electronics device.
In the prior art, during flexible DC power transmission, the method for higher hamonic wave is not suppressed well.
The content of the invention
Based on this, it is necessary to the problem of for higher hamonic wave can not be suppressed in the prior art, there is provided one kind suppresses flexible straight
The method and system of higher hamonic wave in stream transmission of electricity.
The method of higher hamonic wave, comprises the following steps in a kind of suppression flexible DC power transmission：
Obtain the soft straight transformer net side reference current signals of MMC in flexible direct current power transmission system；
Gather the soft straight transformer current on line side signals of MMC and the soft straight transformer voltage on line side signals of MMC；
Straight transformer net side reference current signal soft to the MMC and the soft straight transformer current on line side signals of the MMC
Difference carries out PI processing, obtains the first MMC valve side modulated voltage signal；
Straight transformer voltage on line side signal soft to the MMC carries out park conversion, obtains the soft straight changes of MMC under dq coordinate systems
Depressor voltage on line side signal；
Straight transformer voltage on line side signal soft to the MMC under the dq coordinate systems carries out low-pass filtering treatment；
According to the MMC under the dq coordinate systems after the first MMC valve side modulated voltage signal and low-pass filtering treatment
The difference of soft straight transformer voltage on line side signal, obtains the second MMC valve side modulated voltage signal；
According to the difference of the soft straight transformer voltage on line side signal of the second MMC valve side modulated voltage signal and the MMC,
Obtain final MMC valve side voltage modulation signal；
The soft straight transformer net side actual current signals of final MMC are obtained according to the final MMC valve side voltage modulation signal.
The system of higher hamonic wave in a kind of suppression flexible DC power transmission, including：
Signal acquisition module, for obtaining the soft straight transformer net side reference current signals of MMC in flexible direct current power transmission system；
Signal acquisition module, for gathering the soft straight transformer current on line side signals of MMC and the soft straight transformer voltage on line side of MMC
Signal；
First MMC valve side voltage signal obtains module, for the soft straight transformer net side reference current signals of the MMC and
The difference of the soft straight transformer current on line side signals of the MMC carries out PI processing, obtains the first MMC valve side modulated voltage signal；
MMC voltage on line side signal under Dq coordinates obtains module, for the soft straight transformer voltage on line side signals of the MMC
Park conversion is carried out, obtains the soft straight transformer voltage on line side signals of MMC under dq coordinate systems；
Low-pass filtering module, for carrying out low pass to the soft straight transformer voltage on line side signals of the MMC under the dq coordinate systems
Filtering process；
Second MMC valve side voltage signal obtains module, for according to the first MMC valve side modulated voltage signal and low pass
The difference of the soft straight transformer voltage on line side signals of the MMC under the dq coordinate systems after filtering process, obtains the second MMC valve side and adjusts
Voltage signal processed；
Final MMC valve side voltage signal obtains module, for according to the second MMC valve side modulated voltage signal and described
The difference of the soft straight transformer voltage on line side signals of MMC, obtains final MMC valve side voltage modulation signal；
Final MMC net sides actual current signal obtains module, for being obtained according to the final MMC valve side voltage modulation signal
Obtain the soft straight transformer net side actual current signals of final MMC.
The method and system for suppressing higher hamonic wave in flexible DC power transmission in the present invention, mainly in flexible DC power transmission
Process determines final MMC valve side voltage according to the reference current signal of MMC AC, then utilizes final MMC valve side voltage
The soft straight transformer current on line side signals of MMC are controlled, in this process, due to easily producing higher hamonic wave in the MMC courses of work,
Therefore higher hamonic wave, the high order are carried in the soft straight transformer voltage on line side signals (i.e. the mains voltage signal of MMC ACs) of MMC
Harmonic wave straight transformer current on line side signal soft to MMC can produce interference, therefore the soft straight transformer voltage on line side signals of MMC are carried out
Park converts the signal after carrying out low-pass filtering treatment again as feedback signal, to adjust the soft straight transformer current on line side letters of MMC
Number, so as to the interference of Eliminate highter harmonic straight transformer current on line side signal soft to MMC.
The method of higher hamonic wave, comprises the following steps in a kind of suppression flexible DC power transmission：
Obtain the soft straight transformer net side reference current signals of MMC in flexible direct current power transmission system；
Gather the soft straight transformer current on line side signals of MMC and the soft straight transformer voltage on line side signals of MMC；
Straight transformer net side reference current signal soft to the MMC and the soft straight transformer current on line side signals of the MMC
Difference carries out PI processing, obtains the first MMC valve side modulated voltage signal；
Straight transformer voltage on line side signal soft to the MMC carries out bandpass filtering treatment；
Straight transformer voltage on line side signal soft to the MMC after bandpass filtering treatment carries out park conversion, obtains dq and sits
The soft straight transformer voltage on line side signals of MMC under mark system；
According to the soft straight transformer net side electricity of the MMC under the first MMC valve side modulated voltage signal and the dq coordinate systems
The difference of signal is pressed, obtains the second MMC valve side modulated voltage signal；
According to the difference of the soft straight transformer voltage on line side signal of the second MMC valve side modulated voltage signal and the MMC,
Obtain final MMC valve side voltage modulation signal；
The soft straight transformer net side actual current signals of final MMC are obtained according to the final MMC valve side voltage modulation signal.
The system of higher hamonic wave in a kind of suppression flexible DC power transmission, including：
Signal acquisition module, for obtaining the soft straight transformer net side reference current signals of MMC in flexible direct current power transmission system；
Signal acquisition module, for gathering the soft straight transformer current on line side signals of MMC and the soft straight transformer voltage on line side of MMC
Signal；
First MMC valve side voltage signal obtains module, for the soft straight transformer net side reference current signals of the MMC and
The difference of the soft straight transformer current on line side signals of the MMC carries out PI processing, obtains the first MMC valve side modulated voltage signal；
Bandpass filtering modules block, for carrying out bandpass filtering treatment to the soft straight transformer voltage on line side signals of the MMC；
MMC voltage on line side signal under Dq coordinates obtains module, for the soft straight changes of the MMC after bandpass filtering treatment
Depressor voltage on line side signal carries out park conversion, obtains the soft straight transformer voltage on line side signals of MMC under dq coordinate systems；
Second MMC valve side voltage signal obtains module, for according to the first MMC valve side modulated voltage signal and described
The difference of the soft straight transformer voltage on line side signals of MMC under dq coordinate systems, obtains the second MMC valve side modulated voltage signal；
Final MMC valve side voltage signal obtains module, for according to the second MMC valve side modulated voltage signal and described
The difference of the soft straight transformer voltage on line side signals of MMC, obtains final MMC valve side voltage modulation signal；
Final MMC net sides actual current signal obtains module, for being obtained according to the final MMC valve side voltage modulation signal
Obtain the soft straight transformer net side actual current signals of final MMC.
The method and system for suppressing higher hamonic wave in flexible DC power transmission in the present invention in the present invention, mainly basis
The reference current signal of MMC AC determines final MMC valve side voltage, then soft using final MMC valve side voltage control MMC
Straight transformer current on line side signal, in this process, due to easily producing higher hamonic wave in the MMC courses of work, therefore MMC is soft
Higher hamonic wave is carried in straight transformer voltage on line side signal (i.e. the mains voltage signal of MMC ACs), the higher hamonic wave is to MMC
Soft straight transformer current on line side signal can produce interference, therefore the soft straight transformer voltage on line side signals of MMC are being carried out into band logical filter
Ripple processing carries out the signal after park conversion as feedback again, to adjust the soft straight transformer current on line side signals of MMC, so as to eliminate
The interference of higher hamonic wave straight transformer current on line side signal soft to MMC.
Brief description of the drawings
Fig. 1 is the flow of the method for suppressing higher hamonic wave in flexible DC power transmission of the present invention in one of the embodiments
Schematic diagram；
Fig. 2 is flexible direct current power transmission system schematic diagram；
Fig. 3 is caused higher hamonic wave schematic diagram in flexible DC power transmission of the invention；
Fig. 4 is MMC current transformer steady-state operation AC vector graphs of a relation in flexible DC power transmission of the invention；
Fig. 5 is the current loop control figure of the flexible DC power transmission of the present invention in one of the embodiments；
Fig. 6 is the flow of the method for suppressing higher hamonic wave in flexible DC power transmission of the present invention in one of the embodiments
Schematic diagram；
Fig. 7 is the flow of the method for suppressing higher hamonic wave in flexible DC power transmission of the present invention in one of the embodiments
Schematic diagram；
Fig. 8 is the current loop control figure of the flexible DC power transmission of the present invention in one of the embodiments；
Fig. 9 is the flow of the method for suppressing higher hamonic wave in flexible DC power transmission of the present invention in one of the embodiments
Schematic diagram；
Figure 10 is the knot of the system for suppressing higher hamonic wave in flexible DC power transmission of the present invention in one of the embodiments
Structure schematic diagram；
Figure 11 is the knot of the system for suppressing higher hamonic wave in flexible DC power transmission of the present invention in one of the embodiments
Structure schematic diagram；
Figure 12 is the knot of the system for suppressing higher hamonic wave in flexible DC power transmission of the present invention in one of the embodiments
Structure schematic diagram；
Figure 13 is the knot of the system for suppressing higher hamonic wave in flexible DC power transmission of the present invention in one of the embodiments
Structure schematic diagram；
Figure 14 is the structural representation of the computer equipment of the present invention in one embodiment.
Embodiment
Present disclosure is described in further detail below in conjunction with preferred embodiment and accompanying drawing.Obviously, hereafter institute
The embodiment of description is only used for explaining the present invention, rather than limitation of the invention.It is general based on the embodiment in the present invention, this area
The every other embodiment that logical technical staff is obtained under the premise of creative work is not made, belong to what the present invention protected
Scope.It should be noted that for the ease of describing, part related to the present invention rather than full content are illustrate only in accompanying drawing.
Fig. 1 is the flow signal of the method for suppressing higher hamonic wave in flexible DC power transmission of the present invention in one embodiment
Figure, as shown in figure 1, the method for suppressing higher hamonic wave in flexible DC power transmission in the embodiment of the present invention, comprises the following steps：
Step S110, obtain the soft straight transformer net side reference current signals of MMC in flexible direct current power transmission system.
Specifically, the soft straight transformer net side reference current signals of the MMC can be that user is straight according to the flexibility of reality
The demand of straight transformer current on line side signal soft to MMC in stream electricity transmission process and set, itself and the soft straight transformers of final MMC
Net side actual current signal size and Orientation is identical.Interior ring controller in flexible DC power transmission is according to the soft straight transformations of MMC
Device net side reference current signal is handled accordingly, finally obtains the soft straight transformer net side actual current signals of final MMC.
The soft straight transformer current on line side signal of step S120, collection MMC and the soft straight transformer voltage on line side signals of MMC.
Specifically, interior ring controller is handled accordingly according to the soft straight transformer net side reference current signals of MMC, most
After obtain the soft straight transformer net side actual current signals of final MMC during, also to gather the soft straight transformer current on line side of MMC
Signal and the soft straight transformer voltage on line side signals of MMC simultaneously also do corresponding processing to these signals, just obtain the soft straight changes of final MMC
Depressor net side actual current signal.
Step S130, the soft straight transformer current on line side signal of straight transformer net side reference current signal and MMC soft to MMC
Difference carries out PI processing, obtains the first MMC valve side modulated voltage signal.
Step S140, straight transformer voltage on line side signal soft to MMC carry out park conversion, obtain the MMC under dq coordinate systems
Soft straight transformer voltage on line side signal.
Step S150, straight transformer voltage on line side signal soft to the MMC under dq coordinate systems carry out low-pass filtering treatment.
Step S160, according to the MMC under the dq coordinate systems after the first MMC valve side modulated voltage signal and low-pass filtering treatment
The difference of soft straight transformer voltage on line side signal, obtains the second MMC valve side modulated voltage signal.
Step S170, according to the difference of the soft straight transformer voltage on line side signal of the second MMC valve side modulated voltage signal and MMC
Value, obtains final MMC valve side voltage modulation signal.
Step S180, the soft straight transformer net side actual currents of final MMC are obtained according to final MMC valve side voltage modulation signal
Signal.
Specifically, Technology of HVDC based Voltage Source Converter flourishes in power supply field, especially the more level of half-bridge moduleization
(MMC) technology increasingly earns widespread respect.As shown in Fig. 2 Fig. 2 be flexible direct current power transmission system schematic diagram (wherein MMC with
There is transformer to be not drawn between inductance L), Z is system internal impedance, and L is the equivalent reactance for becoming leakage inductance and the formation of bridge arm inductance,For
Soft straight transformer voltage on line side vector,For the voltage vector on L,For voltage on valve side vector, UdcFor DC voltage.MMC
Three-phase (because each phase be all identical, a phase is only depicted in all figures) is made up of 6 bridge arms, each bridge arm by it is N number of (
Can be one) half-bridge submodule (part of square frame in Fig. 2) is in series, and each half submodule is by 2 band inverse parallel two poles
IEGT (Injection Enhanced Gate Transistor, the electron injection enhancement gate transistors) compositions of pipe, can root
2 kinds of level are exported according to working conditions different 2 IEGT.In flexible DC power transmission, MMC can be utilized to realize exchange and direct current
Between conversion, then during flexible DC power transmission, if flexible direct current operate in weak pattern system under the conditions of, easily cause high frequency
Vibration, i.e., higher hamonic wave is produced in AC, (Fig. 3 is flexible DC power transmission process in the Asynchronous Interconnection engineering of Yunnan as shown in 3
In caused by 25 subharmonic phenomenons), these higher hamonic waves can make system produce overcurrent and overvoltage, so as to cause full-control type
The damage of power electronic devices.
In addition, during flexible DC power transmission, AC vector correlation such as Fig. 4 during MMC soft straight current transformer steady-state operations
It is shown, wherein (a) pure inductance characteristic is run, (b) pure resistance characteristic operation, (c) purely capacitive characteristic operation, (d) pure negative resistance
Characteristic is run.Wherein,For grid side voltage vector (i.e. the line voltage of MMC ACs)；For current transformer side voltage vector
(i.e. MMC valve side voltage vector)；For voltage vector in equivalent reactance；Current phasor (the i.e. soft straight transformers of MMC are surveyed for exchange
Current on line side vector).As can be seen from Figure 2：If with line voltage vectorFor reference direction, by controlling current transformer side voltage
VectorCurrent phasor is surveyed in can control exchangeAnd then realize the flexible DC power transmission of whole current transformer.Assuming that current transformer is defeated
Go out for full power, reach upper current limit, be designated as | I | (| I | beRated signal or peak signal).| I | it is constant, | VL|=ω L
| I | also immobilize, at this moment current transformer voltage vectorEnd points movement locus be withEnd points be the center of circle, | VL| for radius
Circle.Work as voltage vectorWhen end points is positioned at the track A points of circle, current phasorLag behind voltage vectorAngle be 90 °,
Now pure inductance characteristic is presented in current transformer net side, as shown in fig. 4 a；Work as voltage vectorWhen end points is run to Circular test B points,
Current phasorWith line voltage vectorDirection is identical, and now positive resistance characteristic is presented in current transformer net side, as shown in Figure 4 b；When
Voltage vectorWhen end points is run to Circular test C points, current phasor I is in advance and voltage vectorAngle be 90 °, this time-varying
It is in existing capacitance characteristic to flow device net side, as illustrated in fig. 4 c；Work as voltage vectorWhen power-off operation is to round D point positions, electric current arrow
AmountDirection and line voltage vectorParallel and in opposite direction, now negative resistance property is presented in current transformer net side, such as Fig. 4 d institutes
Show.This four points A, B, C, D be current transformer flexible DC power transmission particular job point, other operating points moving law such as
Under：
Work as voltage vectorEnd points operates in Circular testWhen, current transformer operates in rectification state, is absorbed from power network
Active power.When particularly operating in B points, whole current transformer is operated in the rectification state that unit power factor is 1, does not absorb
Or send idle.
Work as voltage vectorEnd points operates in Circular testWhen, current transformer is operated in inverter mode, is sent to power network
Active power.When particularly operating in D points, whole current transformer is operated in the inverter mode that unity power factor is 1.
Work as voltage vectorEnd points operates in Circular testWhen, current transformer absorbs idle state in perception, operation,
Current phasorAlways lag behind voltageWhen particularly operating in A points, current transformer is operated in pure inductance running status.
Work as voltage vectorEnd points operates in Circular testWhen, current transformer is in capacitive, sends reactive power, electric current arrow
AmountFall behind voltage vector alwaysWhen particularly operating in C points, current transformer is operated in the state of purely capacitive operation.
As can be seen that the four quadrant running of whole current transformer is realized, can be by controlling current transformer side voltage V to control
Power network current I, the four-quadrant operation of whole current transformer is realized according to I diverse location.
But in the course of work of current transformer, AC easily produces higher hamonic wave in power network, and higher hamonic wave can be disturbed
The work of current transformer four-quadrant, therefore in current transformer four-quadrant operation, suppress higher hamonic wave.Detailed process is as shown in figure 5, head
First obtain the soft straight transformer net side reference current signal i of MMC in flexible direct current power transmission systemqref；And gather the soft straight transformers of MMC
Current on line side signal iqAnd the soft straight transformer voltage on line side signal u of MMCq；According to reference current signal iqrefWith the MMC of collection
Soft straight transformer current on line side signal(wherein T2For current sample delay cycle, there is delay during collection)
Difference carries out PI (i.e. proportional integration computing) computing, obtains the first MMC valve side modulated voltage signal uq1.Then to the MMC of collection
Soft straight transformer voltage on line side signal(wherein, T1For the feed-forward voltage sampling time delay cycle, have during collection and prolong
When) park conversion (being changed into dp0 coordinate systems under abc coordinate systems) and low-pass filtering treatment are carried out to it after, according to
One MMC valve side modulated voltage signal uq1And the soft straight transformer voltage on line side letters of MMC through park conversion and low-pass filtering treatment
Number difference, obtain the second MMC valve side modulated voltage signal uq2.According to the second MMC valve side modulated voltage signal uq2It is soft with MMC
Straight transformer voltage on line side signal uqDifference, obtain final MMC valve side voltage vq.According to final MMC valve side voltage vqObtain most
The soft straight transformer current on line side signal i of whole MMCqf。
It should be appreciated that in flexible DC power transmission control process, MMC is under abc coordinate systems, by control transverter three
Phase output voltage, you can to realize the control of transverter three-phase output circuit, so as to realize active or Reactive Power Control.And
Under three-phase abc coordinates, it is unfavorable for carrying out active power and Reactive Power Control.Therefore, under normal conditions, to MMC carry out
Coordinate system conversion system, switchs into dq coordinate systems by abc coordinate systems, easier by the conversion control process of coordinate system.
After dq coordinate system conversions are carried out, the control principle completion of d axles and q axles is identical, therefore, during above-mentioned MMC four-quadrant operations
Refer to the control process for giving q axles, and the control process of d axles is identical with q axles.
The above-mentioned method for suppressing higher hamonic wave in flexible DC power transmission is mainly the reference current according to MMC AC
Signal determines final MMC valve side voltage, then controls the soft straight transformer current on line side signals of MMC using final MMC valve side voltage,
In this process, due to easily producing higher hamonic wave, therefore the soft straight transformer voltage on line side signals of MMC in the MMC courses of work
Higher hamonic wave, the higher hamonic wave straight transformer current on line side letter soft to MMC are carried in (i.e. the mains voltage signal of MMC ACs)
It number can produce interference, therefore the soft straight transformer voltage on line side signals of MMC are carried out after park conversion carries out low-pass filtering treatment again
Signal as feedback signal, to adjust the soft straight transformer current on line side signals of MMC, so as to which Eliminate highter harmonic is soft to MMC straight
The interference of transformer current on line side signal.
In one of the embodiments, as shown in fig. 6, according to the soft straight change of the second MMC valve side modulated voltage signal and MMC
The difference of depressor voltage on line side signal, in the step of obtaining final MMC valve side voltage modulation signal, in addition to：
Step S171, park conversion is carried out to the second MMC valve side modulated voltage signal, obtains second under dq coordinate systems
MMC valve side modulated voltage signal；
Step S172, according to the soft straight transformer net side electricity of the second MMC valve side modulated voltage signal under dq coordinate systems and MMC
The difference of signal is pressed, obtains final MMC valve side voltage modulation signal.
Specifically, to the second MMC valve side modulated voltage signal uq2Park conversion is carried out (under abc coordinate systems to change
For dp0 coordinate systems), obtain the second MMC valve side modulated voltage signal under dq coordinate systems；According to the 2nd MMC under dq coordinate systems
The difference of valve side modulated voltage signal and the soft straight transformer voltage on line side signals of MMC, obtains final MMC valve side voltage modulation signal
iqf。
It should be appreciated that refer to the control process for giving q axles during above-mentioned MMC four-quadrant operations, and the control process of d axles
It is identical with q axles.
Fig. 7 is the flow signal of the method for suppressing higher hamonic wave in flexible DC power transmission of the present invention in one embodiment
Figure, as shown in fig. 7, the method for suppressing higher hamonic wave in flexible DC power transmission in the embodiment of the present invention, comprises the following steps：
Step S210, obtain the soft straight transformer net side reference current signals of MMC in flexible direct current power transmission system；
The soft straight transformer current on line side signal of step S220, collection MMC and the soft straight transformer voltage on line side signals of MMC；
Step S230, the soft straight transformer current on line side signal of straight transformer net side reference current signal and MMC soft to MMC
Difference carries out PI processing, obtains the first MMC valve side modulated voltage signal；
Step S240, straight transformer voltage on line side signal soft to MMC carry out bandpass filtering treatment；
Step S250, straight transformer voltage on line side signal soft to the MMC after bandpass filtering treatment carry out park conversion, obtained
The soft straight transformer voltage on line side signals of MMC under dq coordinate systems；
Step S260, according to the soft straight transformer net side electricity of the MMC under the first MMC valve side modulated voltage signal and dq coordinate systems
The difference of signal is pressed, obtains the second MMC valve side modulated voltage signal；
Step S270, according to the difference of the soft straight transformer voltage on line side signal of the second MMC valve side modulated voltage signal and MMC
Value, obtains final MMC valve side voltage modulation signal；
Step S280, the soft straight transformer net side actual currents of final MMC are obtained according to final MMC valve side voltage modulation signal
Signal.
Specifically, in the course of work of current transformer, AC easily produces higher hamonic wave, higher hamonic wave meeting in power network
The work of current transformer four-quadrant is disturbed, therefore in current transformer four-quadrant operation, suppresses higher hamonic wave.Detailed process such as Fig. 8 institutes
Show, obtain the soft straight transformer net side reference current signal i of MMC in flexible direct current power transmission system firstqref；And it is soft straight to gather MMC
Transformer current on line side signal iqAnd the soft straight transformer voltage on line side signal u of MMCq；According to reference current signal iqrefAnd collection
The soft straight transformer current on line side signals of MMC(wherein T2For current sample delay cycle, have during collection and prolong
When) difference carry out PI (proportional integration computing) computing, acquisition the first MMC valve side modulated voltage signal uq1.Then to collection
The soft straight transformer voltage on line side signals of MMC(wherein, T1For the feed-forward voltage sampling time delay cycle, during collection
Have delay) bandpass filtering is carried out, carry out park conversion again after bandpass filtering treatment and (be changed into dp0 seats under abc coordinate systems
Mark system), then according to the first MMC valve side modulated voltage signal uq1And the soft straight transformations of MMC handled through bandpass filtering and park
The difference of device voltage on line side signal, obtain the second MMC valve side modulated voltage signal uq2.According to the second MMC valve side modulation voltage letter
Number uq2With the soft straight transformer voltage on line side signal u of MMCqDifference, obtain final MMC valve side voltage vq.According to final MMC valve side
Voltage vqObtain the soft straight transformer current on line side signal i of final MMCqf。
The process of flexible DC power transmission in the present invention is mainly to be determined most according to the reference current signal of MMC AC
Whole MMC valve side voltage, then using the soft straight transformer current on line side signals of final MMC valve side voltage control MMC, in this process
In, due to easily producing higher hamonic wave in the MMC courses of work, therefore (i.e. MMC is exchanged the soft straight transformer voltage on line side signals of MMC
The mains voltage signal of side) in carry higher hamonic wave, the higher hamonic wave straight transformer current on line side signal soft to MMC can produce dry
Disturb, therefore the soft straight transformer voltage on line side signals of MMC are subjected to the signal after park conversion in progress bandpass filtering treatment again and made
To feed back, to adjust the soft straight transformer current on line side signals of MMC, so as to Eliminate highter harmonic straight transformer net side electricity soft to MMC
Flow the interference of signal.
In one of the embodiments, the bandpass filtering is 50Hz bandpass filtering.Can be with complete using 50Hz filtering
The full higher hamonic wave suppressed in the soft straight transformer voltage on line side signals of MMC, so as to Eliminate highter harmonic straight transformer net soft to MMC
The interference of side current signal.
In one of the embodiments, as shown in figure 9, according to the soft straight change of the second MMC valve side modulated voltage signal and MMC
The difference of depressor voltage on line side signal, in the step of obtaining final MMC valve side voltage modulation signal, in addition to：
Step S271, park conversion is carried out to the second MMC valve side modulated voltage signal, obtains second under dq coordinate systems
MMC valve side modulated voltage signal；
Step S272, according to the soft straight transformer net side electricity of the second MMC valve side modulated voltage signal under dq coordinate systems and MMC
The difference of signal is pressed, obtains final MMC valve side voltage modulation signal.
Specifically, to the second MMC valve side modulated voltage signal uq2Park conversion is carried out (under abc coordinate systems to change
For dp0 coordinate systems), obtain the second MMC valve side modulated voltage signal under dq coordinate systems；According to the 2nd MMC under dq coordinate systems
The difference of valve side modulated voltage signal and the soft straight transformer voltage on line side signals of MMC, obtains final MMC valve side voltage modulation signal
iqf。
It should be appreciated that refer to the control process for giving q axles during above-mentioned MMC four-quadrant operations, and the control process of d axles
It is identical with q axles.
Figure 10 is that the structure of the system of higher hamonic wave in suppression flexible DC power transmission of the invention in one embodiment is shown
It is intended to.As shown in Figure 10, the system for suppressing higher hamonic wave in flexible DC power transmission in the embodiment, including：
Signal acquisition module 10, for obtaining the soft straight transformer net side reference current letters of MMC in flexible direct current power transmission system
Number；
Signal acquisition module 20, for gathering the soft straight transformer current on line side signals of MMC and the soft straight transformer net side electricity of MMC
Press signal；
First MMC valve side voltage signal obtains module 30, for the soft straight transformer net side reference current signals of MMC and
The difference of the soft straight transformer current on line side signals of MMC carries out PI processing, obtains the first MMC valve side modulated voltage signal；
MMC voltage on line side signal under Dq coordinates obtains module 40, for entering to the soft straight transformer voltage on line side signals of MMC
Row park is converted, and obtains the soft straight transformer voltage on line side signals of MMC under dq coordinate systems；
Low-pass filtering module 50, for carrying out low pass filtered to the soft straight transformer voltage on line side signals of the MMC under dq coordinate systems
Ripple processing；
Second MMC valve side voltage signal obtains module 60, for according to the first MMC valve side modulated voltage signal and low pass filtered
The difference of the soft straight transformer voltage on line side signals of the MMC under dq coordinate systems after ripple processing, obtains the second MMC valve side modulation voltage
Signal；
Final MMC valve side voltage signal obtains module 70, for soft according to the second MMC valve side modulated voltage signal and MMC
The difference of straight transformer voltage on line side signal, obtains final MMC valve side voltage modulation signal；
Final MMC net sides actual current signal obtains module 80, for being obtained according to final MMC valve side voltage modulation signal
The final soft straight transformer net side actual current signals of MMC.
In one of the embodiments, as shown in figure 11, suppress the system of higher hamonic wave in flexible DC power transmission, also wrap
Include：The second MMC valve side voltage signal under Dq coordinates obtains module 71,
The second MMC valve side voltage signal under Dq coordinates obtains mould 71, for entering to the second MMC valve side modulated voltage signal
Row park is converted, and obtains the second MMC valve side modulated voltage signal under dq coordinate systems；
Final MMC valve side voltage signal obtains module 70, for according to the second MMC valve side modulation voltage under dq coordinate systems
The difference of signal and the soft straight transformer voltage on line side signals of MMC, obtains final MMC valve side voltage modulation signal.
The system of higher hamonic wave can perform the method that the embodiment of the present invention is provided, tool in above-mentioned suppression flexible DC power transmission
For the corresponding functional module of execution method and beneficial effect.As for the processing method performed by wherein each functional module, such as
Data obtaining module 10, final MMC valve side voltage signal obtain module 70 etc., can refer to the description in above method embodiment,
No longer repeated herein.
Figure 12 is that the structure of the system of higher hamonic wave in suppression flexible DC power transmission of the invention in one embodiment is shown
It is intended to.As shown in figure 12, the system for suppressing higher hamonic wave in flexible DC power transmission in the embodiment, including：
Signal acquisition module 100, for obtaining the soft straight transformer net side reference current letters of MMC in flexible direct current power transmission system
Number；
Signal acquisition module 200, for gathering the soft straight transformer current on line side signals of MMC and the soft straight transformer net sides of MMC
Voltage signal；
First MMC valve side voltage signal obtains module 300, for the soft straight transformer net side reference current signals of MMC and
The difference of the soft straight transformer current on line side signals of MMC carries out PI processing, obtains the first MMC valve side modulated voltage signal；
Bandpass filtering modules block 400, for carrying out bandpass filtering treatment to the soft straight transformer voltage on line side signals of MMC；
MMC voltage on line side signal under Dq coordinates obtains module 500, for the soft straight changes of the MMC after bandpass filtering treatment
Depressor voltage on line side signal carries out park conversion, obtains the soft straight transformer voltage on line side signals of MMC under dq coordinate systems；
Second MMC valve side voltage signal obtains module 600, for according to the first MMC valve side modulated voltage signal and dq seats
The difference of the soft straight transformer voltage on line side signals of MMC under mark system, obtains the second MMC valve side modulated voltage signal；
Final MMC valve side voltage signal obtains module 700, for soft according to the second MMC valve side modulated voltage signal and MMC
The difference of straight transformer voltage on line side signal, obtains final MMC valve side voltage modulation signal；
Final MMC net sides actual current signal obtains module 800, for being obtained according to final MMC valve side voltage modulation signal
Obtain the soft straight transformer net side actual current signals of final MMC.
In one of the embodiments, as shown in figure 13, suppress the system of higher hamonic wave in flexible DC power transmission, also wrap
Include：The second MMC valve side voltage signal under Dq coordinates obtains module 701,
The second MMC valve side voltage signal under Dq coordinates obtains mould 701, for the second MMC valve side modulated voltage signal
Park conversion is carried out, obtains the second MMC valve side modulated voltage signal under dq coordinate systems；
Final MMC valve side voltage signal obtains module 700, for modulating electricity according to the second MMC valve side under dq coordinate systems
The difference of signal and the soft straight transformer voltage on line side signals of MMC is pressed, obtains final MMC valve side voltage modulation signal.
The system of higher hamonic wave can perform the method that the embodiment of the present invention is provided, tool in above-mentioned suppression flexible DC power transmission
For the corresponding functional module of execution method and beneficial effect.As for the processing method performed by wherein each functional module, such as
The second MMC valve side voltage signal under data obtaining module 100, Dq coordinates obtains mould 701, final MMC valve side voltage signal obtains
Module 700 etc. is obtained, the description in above method embodiment is can refer to, is no longer repeated herein.
According to the method and system for suppressing higher hamonic wave in flexible DC power transmission of the invention described above, the present invention also provides one
Kind computer equipment, below in conjunction with the accompanying drawings and the computer equipment of the present invention is described in detail for preferred embodiment.
Figure 14 is the structural representation of the computer equipment of the present invention in one embodiment.As shown in Figure 10, the implementation
Computer equipment 140 in example, including memory 141, processor 142 and storage can be run on a memory and on a processor
Computer program, wherein computing device program when can realize all method and steps in the inventive method embodiment.
It is defeated to can perform the suppression flexible direct current that the embodiment of the present invention is provided for processor 142 in above computer equipment 140
The method of higher hamonic wave in electricity, possesses the corresponding beneficial effect of execution method.The description in above method embodiment is can refer to, this
Place is no longer repeated.
According to the method, system and the computer equipment that suppress higher hamonic wave in flexible DC power transmission of the invention described above, sheet
Invention also provides a kind of computer-readable recording medium, and below in conjunction with the accompanying drawings and preferred embodiment is to the computer-readable of the present invention
Storage medium is described in detail.
Computer-readable recording medium in the embodiment of the present invention, is stored thereon with computer program, and the program is processed
Device can realize all method and steps in the inventive method embodiment when performing.
One of ordinary skill in the art will appreciate that realize all or part of flow in above-described embodiment method, being can be with
Instruct the hardware of correlation to complete by computer program, program can be stored in a computer read/write memory medium,
The program is upon execution, it may include such as the flow of the embodiment of above-mentioned each method.Wherein, storage medium can be magnetic disc, CD,
Read-only memory (Read-Only Memory, ROM) or random access memory (Random Access Memory,
RAM) etc. ".
Above computer readable storage medium storing program for executing is used to store in the suppression flexible DC power transmission that the embodiment of the present invention is provided
The program (instruction) of the method for higher hamonic wave, wherein the method that the embodiment of the present invention is provided can be performed by performing the program, tool
For the corresponding beneficial effect of execution method.The description in above method embodiment is can refer to, is no longer repeated herein.
Each technical characteristic of above example can be combined arbitrarily, to make description succinct, not to above-described embodiment
In each technical characteristic it is all possible combination be all described, as long as however, lance is not present in the combination of these technical characteristics
Shield, all it is considered to be the scope of this specification record.
Above example only expresses the several embodiments of the present invention, and its description is more specific and detailed, but can not
Therefore it is construed as limiting the scope of the patent.It should be pointed out that for the person of ordinary skill of the art,
On the premise of not departing from present inventive concept, various modifications and improvements can be made, these belong to protection scope of the present invention.
Therefore, the protection domain of patent of the present invention should be determined by the appended claims.
Claims (10)
- A kind of 1. method for suppressing higher hamonic wave in flexible DC power transmission, it is characterised in that comprise the following steps：Obtain the soft straight transformer net side reference current signals of MMC in flexible direct current power transmission system；Gather the soft straight transformer current on line side signals of MMC and the soft straight transformer voltage on line side signals of MMC；The difference of straight transformer net side reference current signal soft to the MMC and the soft straight transformer current on line side signals of the MMC PI processing is carried out, obtains the first MMC valve side modulated voltage signal；Straight transformer voltage on line side signal soft to the MMC carries out park conversion, obtains the soft straight transformers of MMC under dq coordinate systems Voltage on line side signal；Straight transformer voltage on line side signal soft to the MMC under the dq coordinate systems carries out low-pass filtering treatment；It is soft straight according to the MMC under the dq coordinate systems after the first MMC valve side modulated voltage signal and low-pass filtering treatment The difference of transformer voltage on line side signal, obtain the second MMC valve side modulated voltage signal；According to the difference of the soft straight transformer voltage on line side signal of the second MMC valve side modulated voltage signal and the MMC, obtain Final MMC valve side voltage modulation signal；The soft straight transformer net side actual current signals of final MMC are obtained according to the final MMC valve side voltage modulation signal.
- 2. the method according to claim 1 for suppressing higher hamonic wave in flexible DC power transmission, it is characterised in that according to institute The difference of the second MMC valve side modulated voltage signal and the soft straight transformer voltage on line side signals of the MMC is stated, obtains final MMC valve In the step of side voltage modulation signal, in addition to：Park conversion is carried out to the second MMC valve side modulated voltage signal, obtains the second MMC valve side modulation under dq coordinate systems Voltage signal；According to the soft straight transformer voltage on line side letter of the second MMC valve side modulated voltage signal under the dq coordinate systems and the MMC Number difference, obtain final MMC valve side voltage modulation signal.
- A kind of 3. method for suppressing higher hamonic wave in flexible DC power transmission, it is characterised in that comprise the following steps：Obtain the soft straight transformer net side reference current signals of MMC in flexible direct current power transmission system；Gather the soft straight transformer current on line side signals of MMC and the soft straight transformer voltage on line side signals of MMC；The difference of straight transformer net side reference current signal soft to the MMC and the soft straight transformer current on line side signals of the MMC PI processing is carried out, obtains the first MMC valve side modulated voltage signal；Straight transformer voltage on line side signal soft to the MMC carries out bandpass filtering treatment；Straight transformer voltage on line side signal soft to the MMC after bandpass filtering treatment carries out park conversion, obtains dq coordinate systems Under the soft straight transformer voltage on line side signals of MMC；According to the soft straight transformer voltage on line side letters of the MMC under the first MMC valve side modulated voltage signal and the dq coordinate systems Number difference, obtain the second MMC valve side modulated voltage signal；According to the difference of the soft straight transformer voltage on line side signal of the second MMC valve side modulated voltage signal and the MMC, obtain Final MMC valve side voltage modulation signal；The soft straight transformer net side actual current signals of final MMC are obtained according to the final MMC valve side voltage modulation signal.
- 4. the method according to claim 3 for suppressing higher hamonic wave in flexible DC power transmission, it is characterised in that according to institute The difference of the second MMC valve side modulated voltage signal and the soft straight transformer voltage on line side signals of the MMC is stated, obtains final MMC valve In the step of side voltage modulation signal, in addition to：Park conversion is carried out to the second MMC valve side modulated voltage signal, obtains the second MMC valve side modulation under dq coordinate systems Voltage signal；According to the soft straight transformer voltage on line side letter of the second MMC valve side modulated voltage signal under the dq coordinate systems and the MMC Number difference, obtain final MMC valve side voltage modulation signal.
- A kind of 5. system for suppressing higher hamonic wave in flexible DC power transmission, it is characterised in that including：Signal acquisition module, for obtaining the soft straight transformer net side reference current signals of MMC in flexible direct current power transmission system；Signal acquisition module, for gathering the soft straight transformer current on line side signals of MMC and the soft straight transformer voltage on line side letters of MMC Number；First MMC valve side voltage signal obtains module, for soft straight transformer net side reference current signals of the MMC and described The difference of the soft straight transformer current on line side signals of MMC carries out PI processing, obtains the first MMC valve side modulated voltage signal；MMC voltage on line side signal under Dq coordinates obtains module, for being carried out to the soft straight transformer voltage on line side signals of the MMC Park is converted, and obtains the soft straight transformer voltage on line side signals of MMC under dq coordinate systems；Low-pass filtering module, for carrying out LPF to the soft straight transformer voltage on line side signals of the MMC under the dq coordinate systems Processing；Second MMC valve side voltage signal obtains module, for according to the first MMC valve side modulated voltage signal and LPF The difference of the soft straight transformer voltage on line side signals of the MMC under the dq coordinate systems after processing, obtains the second MMC valve side modulation electricity Press signal；Final MMC valve side voltage signal obtains module, for according to the second MMC valve side modulated voltage signal and the MMC The difference of soft straight transformer voltage on line side signal, obtains final MMC valve side voltage modulation signal；Final MMC net sides actual current signal obtains module, for being obtained most according to the final MMC valve side voltage modulation signal The soft straight transformer net side actual current signals of whole MMC.
- 6. the system according to claim 5 for suppressing higher hamonic wave in flexible DC power transmission, it is characterised in that including：Dq The second MMC valve side voltage signal under coordinate obtains module；The second MMC valve side voltage signal under the Dq coordinates obtains module, for believing the second MMC valve side modulation voltage Number carry out park conversion, obtain dq coordinate systems under the second MMC valve side modulated voltage signal；The final MMC valve side voltage signal obtains module, for modulating electricity according to the second MMC valve side under the dq coordinate systems The difference of signal and the soft straight transformer voltage on line side signals of the MMC is pressed, obtains final MMC valve side voltage modulation signal.
- A kind of 7. system for suppressing higher hamonic wave in flexible DC power transmission, it is characterised in that including：Signal acquisition module, for obtaining the soft straight transformer net side reference current signals of MMC in flexible direct current power transmission system；Signal acquisition module, for gathering the soft straight transformer current on line side signals of MMC and the soft straight transformer voltage on line side letters of MMC Number；First MMC valve side voltage signal obtains module, for soft straight transformer net side reference current signals of the MMC and described The difference of the soft straight transformer current on line side signals of MMC carries out PI processing, obtains the first MMC valve side modulated voltage signal；Bandpass filtering modules block, for carrying out bandpass filtering treatment to the soft straight transformer voltage on line side signals of the MMC；MMC voltage on line side signal under Dq coordinates obtains module, for the soft straight transformers of the MMC after bandpass filtering treatment Voltage on line side signal carries out park conversion, obtains the soft straight transformer voltage on line side signals of MMC under dq coordinate systems；Second MMC valve side voltage signal obtains module, for according to the first MMC valve side modulated voltage signal and dq seats The difference of the soft straight transformer voltage on line side signals of MMC under mark system, obtains the second MMC valve side modulated voltage signal；Final MMC valve side voltage signal obtains module, for according to the second MMC valve side modulated voltage signal and the MMC The difference of soft straight transformer voltage on line side signal, obtains final MMC valve side voltage modulation signal；Final MMC net sides actual current signal obtains module, for being obtained most according to the final MMC valve side voltage modulation signal The soft straight transformer net side actual current signals of whole MMC.
- 8. the system according to claim 7 for suppressing higher hamonic wave in flexible DC power transmission, it is characterised in that also include： The second MMC valve side voltage signal under Dq coordinates obtains module；The second MMC valve side voltage signal under the Dq coordinates obtains module, for believing the second MMC valve side modulation voltage Number carry out park conversion, obtain dq coordinate systems under the second MMC valve side modulated voltage signal；The final MMC valve side voltage signal obtains module, for modulating electricity according to the second MMC valve side under the dq coordinate systems The difference of signal and the soft straight transformer voltage on line side signals of the MMC is pressed, obtains final MMC valve side voltage modulation signal.
- 9. a kind of computer equipment, including memory, processor and storage are on a memory and the meter that can run on a processor Calculation machine program, it is characterised in that the step of claim 1-4 methods describeds are realized during the computing device described program.
- 10. a kind of computer-readable recording medium, is stored thereon with computer program, it is characterised in that the program is by processor The step of claim 1-4 methods describeds are realized during execution.
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| WO2020155235A1 (en) * | 2019-01-28 | 2020-08-06 | 北京四方继保自动化股份有限公司 | Flexible direct-current high-frequency resonance suppression method based on voltage feedforward nonlinear filtering |
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| CN103441488A (en) * | 2013-08-05 | 2013-12-11 | 南方电网科学研究院有限责任公司 | Flexible direct-current transmission system control method with function of controlling quality of electric energy |
| US20170054294A1 (en) * | 2015-08-18 | 2017-02-23 | Virginia Tech Intellectual Properties, Inc. | Modular multilevel converter capacitor voltage ripple reduction |
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| CN103441488A (en) * | 2013-08-05 | 2013-12-11 | 南方电网科学研究院有限责任公司 | Flexible direct-current transmission system control method with function of controlling quality of electric energy |
| US20170054294A1 (en) * | 2015-08-18 | 2017-02-23 | Virginia Tech Intellectual Properties, Inc. | Modular multilevel converter capacitor voltage ripple reduction |
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| WO2020155235A1 (en) * | 2019-01-28 | 2020-08-06 | 北京四方继保自动化股份有限公司 | Flexible direct-current high-frequency resonance suppression method based on voltage feedforward nonlinear filtering |
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