CN108199377A - A kind of transverter Ripple Suppression method, apparatus, terminal and readable storage medium storing program for executing - Google Patents
A kind of transverter Ripple Suppression method, apparatus, terminal and readable storage medium storing program for executing Download PDFInfo
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- CN108199377A CN108199377A CN201711468292.1A CN201711468292A CN108199377A CN 108199377 A CN108199377 A CN 108199377A CN 201711468292 A CN201711468292 A CN 201711468292A CN 108199377 A CN108199377 A CN 108199377A
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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
- H02J3/01—Arrangements for reducing harmonics or ripples
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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
- Y02E40/00—Technologies for an efficient electrical power generation, transmission or distribution
- Y02E40/40—Arrangements for reducing harmonics
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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]
Abstract
The present invention provides a kind of transverter Ripple Suppression method, apparatus, terminal and readable storage medium storing program for executing, wherein, this method includes：Obtain the DC side electrical network parameter of transverter and exchange side electrical network parameter；Ripple electrical network parameter is obtained according to DC side electrical network parameter and exchange side electrical network parameter；The offset voltage of Converter DC-side is calculated according to ripple electrical network parameter；Obtain the modulation voltage of transverter；The control voltage of transverter is obtained according to offset voltage and modulation voltage；According to control voltage control transverter.By sampling the DC side electrical network parameter of transverter and exchange side electrical network parameter, it is handled later to obtain DC side offset voltage, and offset voltage is superimposed on transverter modulation voltage and obtains control voltage, the control voltage controls transverter, this kind of Ripple Suppression method reduces hardware input cost without additionally increasing DC side ripple filter plant.
Description
Technical field
The present invention relates to flexible DC transmission technology fields, and in particular to a kind of transverter Ripple Suppression method, apparatus, end
End and readable storage medium storing program for executing.
Background technology
The existing voltage source converter with direct fault current self-cleaning ability is based on its realization topology can
It is divided into two types, one kind is based on the follow-on voltage source converter of transverter, and another kind of is follow-on based on submodule
Voltage source converter.It is mainly the topological structure by improving transverter based on the follow-on voltage source converter of transverter, fills
Divide itself topological structure feature using transverter, so as to which it be made to have DC Line Fault self-cleaning ability.It is improved based on submodule
The voltage source converter of type is mainly the own structural characteristics using submodule, uses the son with DC Line Fault self-cleaning ability
Module carries out mixed configuration, in the ability with DC Line Fault self-cleaning, by appropriate configuration so as to promote DC voltage
Utilization rate reduces equipment cost and loss.
The waveform of the voltage and current of transverter exchange side and non-fully sine wave, the voltage and current of DC side nor
Smooth constant DC current, it includes a variety of harmonic components.In other words, transverter can all generate one in exchange side and DC side
Fixed voltage and current interference components.Harmonic wave briefly, be exactly certain frequency voltage or the function of current in nonlinear load
When, the phenomenon that sinusoidal voltage or electric current different from other frequencies of primary frequency can be generated.And ripple refer in DC voltage or
In electric current, the AC compounent that is superimposed upon in DC stabilization amount.There is connection although they are not conceptually the same thing, between them
System, as ripple additional on power supply is easy to generate on electrical appliance the harmonic wave of each frequency；The presence of each frequency harmonics in power supply
Undoubtedly lead to the increase of ripple component in power supply.It, will be to power train if the ripple component into DC power transmission line is excessive
System equipment causes many-sided harm：Harmonic wave is generated in electrical equipment, causes the increase of electrical stress, endangers the safety fortune of equipment
Row；The efficiency of power supply is reduced, and ripple current causes additional fever in these electrical equipments, thus increase the volume of equipment
Definite value requires and operating cost；Stronger ripple can cause the generation of surge voltage or electric current, lead to DC protection system malfunction
Even burn electrical equipment；The logical relation of digital circuit is interfered, influences its normal work；Noise jamming is brought, makes electrically to set
Standby cisco unity malfunction.
Against the above deficiency, in-line filtration equipment is utilized usually on the DC side of voltage source converter in the prior art
(such as passive inductance and capacity cell) to minimize DC ripple, however, for being applied to high-voltage large-capacity flexible DC power transmission
For the submodule voltage source converter in field, then need to increase volume and the quantity of passive element to reach the mesh of Ripple Suppression
, this just so that hardware input is higher, and then leads to production cost height.
Invention content
Therefore, the present invention provides a kind of transverter Ripple Suppression method, apparatus, terminal and readable storage medium storing program for executing, with into one
Step reduces the cost of transverter Ripple Suppression.
For this purpose, the present invention provides following technical solution：
First aspect present invention provides a kind of transverter Ripple Suppression method, includes the following steps：Obtain the straight of transverter
Flow side electrical network parameter and exchange side electrical network parameter；Line is obtained according to the DC side electrical network parameter and the exchange side electrical network parameter
Wave electrical network parameter；The offset voltage of the Converter DC-side is calculated according to the ripple electrical network parameter；Obtain the transverter
Modulation voltage；The control voltage of the transverter is obtained according to the offset voltage and the modulation voltage；According to the control
Voltage processed controls the transverter.
Optionally, the DC side electrical network parameter includes DC voltage and DC side electric current；And/or the exchange side electricity
Network parameters include exchange side voltage, ac-side current, the rotation angular frequency of AC network electromotive force and the phase of AC network
Angle.
Optionally, it is described that ripple power grid ginseng is obtained according to the DC side electrical network parameter and the exchange side electrical network parameter
Number, including：According to the exchange side electrical network parameter to the DC side electrical network parameter carry out Fourier decomposition, matrixing and
Delay Analysis obtains fundametal compoment；Ripple electrical network parameter is calculated according to the fundametal compoment.
Optionally, the ripple electrical network parameter includes the ripple power grid ginseng of the predetermined Clock Multiplier Factor under dq rotating coordinate systems
Number.
Optionally, the predetermined Clock Multiplier Factor is 3n, and the n is positive integer.
Optionally, the ripple power grid ginseng of the predetermined Clock Multiplier Factor under the dq rotating coordinate systems is obtained by equation below
Number,
Wherein, i3nth_dD axis ripple current components for 3n ripple under dq rotating coordinate systems；i3nth_qIt rotates and sits for dq
The q axis ripple current components of 3n ripple under mark system；u3nth_dD axis ripple electricity for 3n ripple under dq rotating coordinate systems
Press component；u3nth_qQ axis ripple voltage components for 3n ripple under dq rotating coordinate systems；θ is the phase angle of AC network；
id0D axis fundamental current components for the fundamental wave under dq rotating coordinate systems；iq0Q axis fundamental waves for the fundamental wave under dq rotating coordinate systems
Current component；ud0D axis fundamental voltage components for the fundamental wave under dq rotating coordinate systems；uq0For the fundamental wave under dq rotating coordinate systems
Q axis fundamental voltage components.
Optionally, it after described the step of calculating ripple electrical network parameter according to the fundametal compoment, further includes：To the line
Wave electrical network parameter is filtered to obtain optimization ripple electrical network parameter.
Optionally, the offset voltage is obtained by equation below,
Wherein, v 'd3nthFor differenceThe d shaft voltage amounts of the 3n ripple by PI control outputs；
v′q3nthFor differenceThe q shaft voltage amounts of the 3n ripple by PI control outputs；vd3nthFor dq rotational coordinates
The d axis offset voltages of 3n ripple under system；vq3nthQ axis offset voltages for 3n ripple under dq rotating coordinate systems；id3nth
D axis for 3n ripple under dq rotating coordinate systems optimizes ripple current component；iq3nthFor 3n line under dq rotating coordinate systems
The q axis optimization ripple current component of wave；ud3nthD axis for 3n ripple under dq rotating coordinate systems optimizes ripple voltage component；
uq3nthQ axis for 3n ripple under dq rotating coordinate systems optimizes ripple voltage component；D for 3n times given ripple
Shaft current desired value；Q shaft current desired values for 3n times given ripple；ω is the rotation angle of AC network electromotive force
Frequency；L is converter bridge arm inductance value.
Optionally, the control voltage of the transverter is obtained by equation below,
Wherein, vaFor the A phase control voltages in three-phase alternating current；vbFor the B phase control voltages in three-phase alternating current；vcFor
C phase control voltages in three-phase alternating current；For the A phase modulation voltages in three-phase alternating current；For in three-phase alternating current
B phase modulation voltages；For the C phase modulation voltages in three-phase alternating current；va3nthElectricity is compensated for the A phases in three-phase alternating current
Pressure；vb3nthFor the B phase offset voltages in three-phase alternating current；vc3nthFor the C phase offset voltages in three-phase alternating current.
Optionally, it is described that the transverter is controlled according to the control voltage, including：Bridge arm is carried out to the control voltage
After the modulation that current balance type control, capacitor voltage balance control and level approach, obtain MMC references and involve trigger pulse, institute
It states MMC and controls the transverter with reference to trigger pulse is involved.
Optionally, it before the step of obtaining the DC side electrical network parameter of transverter and exchange side electrical network parameter, further includes：It builds
Vertical flexible direct current power transmission system mathematical model.
Second aspect of the present invention provides a kind of transverter Ripple Suppression device, including：First acquisition module, for obtaining
The DC side electrical network parameter of transverter and exchange side electrical network parameter；First processing module, for being joined according to the DC side power grid
Number and the exchange side electrical network parameter obtain ripple electrical network parameter；Second processing module, for according to the ripple electrical network parameter
Calculate the offset voltage of the Converter DC-side；Second acquisition module, for obtaining the modulation voltage of the transverter；Third
Processing module, for obtaining the control voltage of the transverter according to the offset voltage and the modulation voltage；Fourth process
Module, for controlling the transverter according to the control voltage.
Third aspect present invention provides a kind of terminal, including：At least one processor and at least one place
The memory of device communication connection is managed, wherein, the memory is stored with the instruction that can be performed by least one processor, institute
It states instruction to be performed by least one processor, so that any at least one processor execution first aspect present invention
The transverter Ripple Suppression method.
Fourth aspect present invention provides a kind of computer readable storage medium, the computer-readable recording medium storage
There is computer instruction, the computer instruction is used to that the computer to be made to perform any change of current in second aspect of the present invention
Device Ripple Suppression method.
Technical solution of the present invention has the following advantages that：
Transverter Ripple Suppression method, apparatus provided by the invention, terminal and readable storage medium storing program for executing, wherein, this method packet
It includes：Obtain the DC side electrical network parameter of transverter and exchange side electrical network parameter；According to DC side electrical network parameter and exchange side power grid
Parameter obtains ripple electrical network parameter；The offset voltage of Converter DC-side is calculated according to ripple electrical network parameter；Obtain transverter
Modulation voltage；The control voltage of transverter is obtained according to offset voltage and modulation voltage；According to control voltage control transverter.It is logical
The DC side electrical network parameter of over-sampling transverter and exchange side electrical network parameter handle it to obtain DC side compensation electricity later
Pressure, and offset voltage is superimposed on transverter modulation voltage and obtains control voltage, control voltage control transverter, this kind of line
Wave suppressing method reduces hardware input cost without additionally increasing DC side ripple filter plant.
Description of the drawings
It, below will be to specific in order to illustrate more clearly of the specific embodiment of the invention or technical solution of the prior art
Embodiment or attached drawing needed to be used in the description of the prior art are briefly described, it should be apparent that, in being described below
Attached drawing is some embodiments of the present invention, for those of ordinary skill in the art, before not making the creative labor
It puts, can also be obtained according to these attached drawings other attached drawings.
Fig. 1 is the flow chart of a specific example of transverter Ripple Suppression method in the embodiment of the present invention；
Fig. 2 is the flow chart of another specific example of transverter Ripple Suppression method in the embodiment of the present invention；
Fig. 3 be the embodiment of the present invention in transverter Ripple Suppression method according to DC side electrical network parameter and exchange side power grid
Parameter obtains the flow chart of the specific example of the step of ripple electrical network parameter；
Fig. 4 is that the ripple voltage of the follow-on voltage source converter DC side of submodule provided in the embodiment of the present invention is imitated
Very；
Fig. 5 is that the ripple current of the follow-on voltage source converter DC side of submodule provided in the embodiment of the present invention is imitated
Very；
Fig. 6 is the follow-on Novel electric potential source Converter DC-side ripple of inhibition submodule provided in the embodiment of the present invention
The inner and outer rings control structure schematic diagram of voltage and electric current；
Fig. 7 is the ripple voltage and current draw schematic diagram provided in the embodiment of the present invention；
Fig. 8 is the ripple decoupling control current loop control schematic diagram provided in the embodiment of the present invention；
Fig. 9 is the compensating ripple voltage amount transition diagram this method provided in the embodiment of the present invention；
Figure 10 is the block diagram of a specific example of transverter Ripple Suppression device in the embodiment of the present invention；
Figure 11 is the structure diagram of terminal in the embodiment of the present invention.
Specific embodiment
Technical scheme of the present invention is clearly and completely described below in conjunction with attached drawing, it is clear that described implementation
Example is part of the embodiment of the present invention, instead of all the embodiments.Based on the embodiments of the present invention, ordinary skill
Personnel's all other embodiments obtained without making creative work, shall fall within the protection scope of the present invention.
In the description of the present invention, it should be noted that term " " center ", " on ", " under ", "left", "right", " vertical ",
The orientation or position relationship of the instructions such as " level ", " interior ", " outer " be based on orientation shown in the drawings or position relationship, merely to
Convenient for the description present invention and simplify description rather than instruction or imply signified device or element must have specific orientation,
With specific azimuth configuration and operation, therefore it is not considered as limiting the invention.In addition, term " first ", " second ",
" third " is only used for description purpose, and it is not intended that instruction or hint relative importance.
In the description of the present invention, it should be noted that unless otherwise clearly defined and limited, term " installation ", " phase
Even ", " connection " should be interpreted broadly, for example, it may be being fixedly connected or being detachably connected or be integrally connected；It can
To be mechanical connection or be electrically connected；It can be directly connected, can also be indirectly connected by intermediary, it can be with
It is the connection inside two elements, can is wireless connection or wired connection.For those of ordinary skill in the art
For, the concrete meaning of above-mentioned term in the present invention can be understood with concrete condition.
As long as in addition, technical characteristic involved in invention described below different embodiments non-structure each other
It can be combined with each other into conflict.
The present embodiment provides a kind of transverter Ripple Suppression method, in flexible direct current power transmission system transverter, realizing
To the ripple compensation of Converter DC-side, hardware input cost is reduced, the flow chart of this method is as shown in Figure 1.As this implementation
One preferred embodiment of example, flow chart is as shown in Fig. 2, include the following steps：
S0：Establish flexible direct current power transmission system mathematical model.
In the present embodiment, flexible direct current power transmission system mathematical model is by submodule under nth harmonic rotating coordinate system
The flexible direct current power transmission system mathematical model of follow-on Novel electric Source Con-verters topology formation, certainly, in other embodiments
In, above-mentioned model can also be other mathematical models, such as carry the model of honourable energy-storage system, and rationally setting is as needed
It can.
S1：Obtain the DC side electrical network parameter of transverter and exchange side electrical network parameter.
In the present embodiment, DC side electrical network parameter includes DC voltage U and DC side electric current I；Certainly, in other realities
It applies in example, DC side electrical network parameter can also be other parameters, such as active power and voltage, rationally setting is as needed
It can.
In the present embodiment, transverter is applied in three-phase three-wire system electric system, and therefore, exchange side electrical network parameter includes
Exchange side voltageAc-side currentThe rotation angular frequency of AC network electromotive force and AC network
Phase angle θ, wherein,Including exchange side A phase voltages usa, exchange side B phase voltages usbWith exchange side C phase voltages usc,Including exchange side A phase currents isa, exchange side B phase currents isbWith exchange side C phase currents isc；Certainly, in other embodiments
In, exchange side electrical network parameter can also be other parameters, such as active power or reactive power, rationally setting is as needed
It can；In other embodiments, the exchange side voltage and current acquired according to needed for determining electric system practical situations, such as exists
In binary system, then two-phase voltage and electric current are acquired.
In this embodiment, according to collected exchange side voltageAC network electromotive force is detected by phaselocked loop
Rotate the phase angle θ of angular frequency and AC network；Certainly, in other embodiments, angular frequency can also directly be detected
And phase angle θ, rationally setting as needed.
S2：Ripple electrical network parameter is obtained according to DC side electrical network parameter and exchange side electrical network parameter.
As a kind of specific embodiment, above-mentioned steps S2 includes step S21 and S22, as shown in figure 3, being specially：
S21：Fourier decomposition, matrixing and delay are carried out to DC side electrical network parameter according to exchange side electrical network parameter
Analysis obtains fundametal compoment.
Converter DC-side voltage U and DC side electric current I, passes through Fourier decomposition three-phase alternating voltage component ui(i.e. ua、
ub、uc) and three-phase alternating current flow component ii(i.e. ia、ib、ic), fundametal compoment is obtained by matrixing and delay Analysis, it is above-mentioned
Fundametal compoment includes the d axis fundamental voltage components u under dq coordinate systemsd0, q axis fundamental voltage components uq0, d axis fundamental current components
id0And d axis fundamental current components iq0。
S22：Ripple electrical network parameter is calculated according to fundametal compoment.
Ripple electrical network parameter includes the ripple electrical network parameter of the predetermined Clock Multiplier Factor under dq rotating coordinate systems.In the present embodiment
In, according to practical situations of the transverter in electric system, carried out to being based on the follow-on voltage source converter of submodule
Emulation, by being analyzed to obtain Converter DC-side ripple characteristics to simulation result, DC voltage ripple wave with three times and
Six it is inferior based on, DC side current ripples with six times and 12 it is inferior based on, therefore, predetermined Clock Multiplier Factor is 3n, and n is just whole
Number, i.e. ripple, six ripples, nine ripples etc. three times；Certainly, in other embodiments, predetermined Clock Multiplier Factor can also be set
For other values, such as 2n or odd-times, as needed rationally setting.
The ripple electrical network parameter of the predetermined Clock Multiplier Factor under dq rotating coordinate systems is obtained by equation below,
Wherein, i3nth_dD axis ripple current components for 3n ripple under dq rotating coordinate systems；i3nth_qIt rotates and sits for dq
The q axis ripple current components of 3n ripple under mark system；u3nth_dD axis ripple electricity for 3n ripple under dq rotating coordinate systems
Press component；u3nth_qQ axis ripple voltage components for 3n ripple under dq rotating coordinate systems；θ is the phase angle of AC network；
id0D axis fundamental current components for the fundamental wave under dq rotating coordinate systems；iq0Q axis fundamental waves for the fundamental wave under dq rotating coordinate systems
Current component；ud0D axis fundamental voltage components for the fundamental wave under dq rotating coordinate systems；uq0For the fundamental wave under dq rotating coordinate systems
Q axis fundamental voltage components.
S3：Ripple electrical network parameter is filtered to obtain optimization ripple electrical network parameter.
In the present embodiment, the ripple voltage of above-mentioned 3n ripple, current component u3nth_d、u3nth_q、i3nth_d、i3nth_qPoint
It is not filtered by trapper, obtains optimization ripple of the 3n ripple under corresponding synchronous rotary dq coordinate systems
Voltage, current component ud3nth、uq3nth、id3nth、iq3nth, the optimization after trapper can filter out relevant interference, improve
The accuracy of Ripple Suppression.Certainly, in other embodiments, can not also be filtered, rationally setting is as needed
It can.
S4：The offset voltage of Converter DC-side is calculated according to ripple electrical network parameter.
In the present embodiment, voltage is compensated by equation below,
Wherein, v 'd3nthFor differenceThe d shaft voltage amounts of the 3n ripple by PI control outputs；
v′q3nthFor differenceThe q shaft voltage amounts of the 3n ripple by PI control outputs；vd3nthFor dq rotational coordinates
The d axis offset voltages of 3n ripple under system；vq3nthQ axis offset voltages for 3n ripple under dq rotating coordinate systems；id3nth
D axis for 3n ripple under dq rotating coordinate systems optimizes ripple current component；iq3nthFor 3n line under dq rotating coordinate systems
The q axis optimization ripple current component of wave；ud3nthD axis for 3n ripple under dq rotating coordinate systems optimizes ripple voltage component；
uq3nthQ axis for 3n ripple under dq rotating coordinate systems optimizes ripple voltage component；D for 3n times given ripple
Shaft current desired value；Q shaft current desired values for 3n times given ripple；ω is the rotation angle of AC network electromotive force
Frequency；L is converter bridge arm inductance value.
It in the present embodiment, will in order to make Ripple Suppression effect optimalWithValue be disposed as 0, certainly,
In other embodiments, other values, such as 0.0001 are may be alternatively provided as, as needed rationally setting.
S5：Obtain the modulation voltage of transverter.
In the present embodiment, according to above-mentioned flexible direct current power transmission system mathematical model, collected exchange side power grid is joined
Number includes exchange side voltageAc-side currentAnd the rotation angle through phaselocked loop detection AC network electromotive force
The phase angle θ of frequencies omega and AC network is changed commanders by Clark and Park changesWithBe converted to synchronous rotary
Voltage, current component u under dq coordinate systemsd、uq、id、iq；Wherein, in synchronous rotary dq coordinate systems, q axis and power grid electricity are selected
Kinetic potential is in the same direction, then the d axis components in synchronous rotary dq coordinate systems represent active component, and q axis components represent reactive component.
MMC-HVDC systems use Direct Current Control method, and exterior ring power/voltage controller passes through to input quantity and ginseng
The deviation considered carries out PI adjustings, obtains and the relevant d shaft currents component of active powerWith with the relevant q axis of reactive power
Current componentThen it is entered into again in inner ring current decoupled control device, obtains voltageIt can be by such as
Lower formula obtains voltage
Wherein, u 'dFor differenceBy the d shaft voltages of PI control outputs；u′qFor differenceBy PI
Control the q shaft voltages of output；For with the relevant d shaft currents component of active power；For with the relevant q axis of reactive power
Current component；idFor the d shaft current components under synchronous rotary dq coordinate systems；iqFor the q shaft currents point under synchronous rotary dq coordinate systems
Amount；udFor the d shaft voltage components under synchronous rotary dq coordinate systems；uqFor the q shaft voltage components under synchronous rotary dq coordinate systems；ω
Rotation angular frequency for AC network electromotive force；L is converter bridge arm inductance value.
VoltageModulation voltage is obtained using Park and Clark inverse transformationsWherein,ForWithFor the A phase modulation voltages in three-phase alternating current,It is adjusted for the B phases in three-phase alternating current
Voltage processed,For the C phase modulation voltages in three-phase alternating current.
S6：The control voltage of transverter is obtained according to offset voltage and modulation voltage.
In the present embodiment, transverter is applied in three-phase three-wire system electric system, can obtain the change of current by equation below
The control voltage v of devicei(va, vb, vc)：
Wherein, vaFor the A phase control voltages in three-phase alternating current；vbFor the B phase control voltages in three-phase alternating current；vcFor
C phase control voltages in three-phase alternating current；For the A phase modulation voltages in three-phase alternating current；For in three-phase alternating current
B phase modulation voltages；For the C phase modulation voltages in three-phase alternating current；va3nthElectricity is compensated for the A phases in three-phase alternating current
Pressure；vb3nthFor the B phase offset voltages in three-phase alternating current；vc3nthFor the C phase offset voltages in three-phase alternating current.
S7：According to control voltage control transverter.
As a kind of specific embodiment, the control of bridge arm current balance, capacitor voltage balance control are carried out to control voltage
After the modulation that system and level approach, MMC is obtained with reference to trigger pulse, MMC is involved and controls transverter with reference to trigger pulse is involved,
In this way so that each submodule corresponds to a reference and involves trigger pulse, the accuracy of Ripple Suppression is improved.
Above-mentioned transverter Ripple Suppression method is joined by the DC side electrical network parameter and exchange side power grid that sample transverter
Number, handles it to obtain DC side offset voltage, and offset voltage is superimposed on transverter modulation voltage and is obtained later
Voltage, control voltage control transverter are controlled, this kind of Ripple Suppression method need not additionally increase DC side ripple filter plant,
Reduce hardware input cost；Certain inhibiting effect is also functioned to the harmonic wave of exchange side simultaneously.It can be well by this method
The ripple for inhibiting the follow-on Novel electric Source Con-verters topology Converter DC-side of flexible direct current power transmission system Neutron module is dirty
Dye problem, while influence of the ripple to transverter topology DC side and exchange side is reduced, in the feelings put into without additional hardware
Under condition, good Ripple Suppression effect can be reached, promote DC voltage utilization rate, reduce equipment cost and loss.
Fig. 4 is that the ripple voltage of the follow-on voltage source converter DC side of submodule provided by the invention emulates, and Fig. 5 is
The ripple current emulation of the follow-on voltage source converter DC side of submodule provided by the invention, passes through the emulation of Fig. 4 and Fig. 5
As a result it can be seen that DC voltage ripple wave with three times with six times based on, DC side current ripples are with six times and 12 times
Main, therefore, in the present embodiment, predetermined Clock Multiplier Factor is 3n, and n is positive integer, i.e. ripple, six ripples, nine ripples etc. three times,
Good inhibiting effect can be played to the ripple that predetermined Clock Multiplier Factor is 3n.
Fig. 6 is the inhibition follow-on Novel electric potential source Converter DC-side ripple voltage of submodule provided by the invention and electricity
The inner and outer rings control structure schematic diagram of stream, Fig. 7 are ripple voltage and current draw schematic diagram；Fig. 8 is ripple decoupling control electric current
Ring control principle drawing；Fig. 9 is compensating ripple voltage amount transition diagram this method.
The structure of MMC flexible direct-current transmission system is surveyed by power supply, charging resistor, tietransformer, bridge arm reactor, submodule
The compositions such as block, the capital equipment that Neutron module includes have IGBT module, storage capacitor C, parallel resistance R, driving circuit GDU,
Power supply unit, radiator, afterflow thyristor T, by-pass switch K and central logic control unit CLC etc., the course of work are existing
Technology, details are not described herein.In Fig. 6ForAndii1, ii2It is the i-th phase (in i a, b, c three-phase
One phase) upper and lower bridge arm electric current；usumi1、usumi2Refer to per mutually the sum of all submodule capacitor voltages of upper and lower bridge arm.
As shown in fig. 7, in the present embodiment, transverter direct current voltage on valve side and electric current U, I pass through Fourier decomposition first
Obtain three-phase alternating voltage and current component ui(i.e. ua、ub、uc) and ii(i.e. ia、ib、ic)；It is obtained together by matrixing later
Fundamental voltage and electric current u under step rotation dq coordinate systemsd0、uq0、id0And iq0；Then, C is carried out to fundamental wavebase/3nthChange is got in return
The voltage of 3n Clock Multiplier Factor ripples under to synchronous rotary dq coordinate systems and electric current u3nth_d、u3nth_q、i3nth_dAnd i3nth_q, most
Afterwards, 3n Clock Multiplier Factors ripple voltage, current component u3nth_d、u3nth_q、i3nth_d、i3nth_qRespectively by trapper after, obtain 3n
DC voltage, current component u of the Clock Multiplier Factor ripple under corresponding synchronous rotary dq coordinate systemsd3nth、uq3nth、id3nth、
iq3nth。
Wherein, Cbase/3nthIt is transformed to：
As shown in figure 8, in the present embodiment, decoupling control is carried out to 3n Clock Multiplier Factors ripple component respectively, according to three-phase
The corresponding dq coordinates explanation of each harmonic under three-wire system, decoupling control item is 3n ω L, thus obtains the decoupling of 3n Clock Multiplier Factors ripple
Control electric current loop.The desired value that 3n Clock Multiplier Factor ripple decoupling control electric current loops giveIt is 0, is disappeared with reaching
Except the purpose of 3n Clock Multiplier Factor ripples, the direct-current component i of 3n Clock Multiplier Factor ripples that will be extractedd3nth、iq3nthWith giving
Desired valueDeviation is sought, by corresponding PI controllers, in conjunction with decoupling control item, in addition corresponding direct current
Component of voltage ud3nth、uq3nth, finally obtain 3n Clock Multiplier Factor compensating ripple voltage amounts vd3nth、vq3nth, i.e.,：
Wherein, v 'd3nth、v′q3nthRespectively differenceIt controls and exports by PI
Voltage；Given desired value
As shown in figure 9, in the present embodiment, by 3n Clock Multiplier Factor compensating ripple voltage amounts vd3nth、vq3nthByTransformation and Park inverse transformations, are transformed under static α, β coordinate system of two-phase, obtain two-phase static α, β of harmonics restraint
Voltage compensation quantity v in coordinate systemα3nth、vβ3nth；Voltage compensation quantity v in three phase coordinate systems is obtained by Clark inverse transformations againa3nth、
vb3nth、vc3nth；Be added to the output voltage reference quantity of interior loop control circuit when not considering 3n Clock Multiplier Factor Ripple Suppressions again The voltage output reference quantity v of three phase coordinate systems after being just compensatedi(i.e. va、vb、vc)；Finally examining
Bridge arm current balance is considered with after capacitor voltage balance control, MMC being exported after coordinate transform with reference to trigger pulse is involved, is realized
Control to MMC transverters achievees the purpose that inhibit 3n Clock Multiplier Factor ripples.
Wherein,It is transformed to：
By Fig. 6 to Fig. 9 it is found that by establish under nth harmonic rotating coordinate system by the follow-on novel voltage of submodule
The flexible direct current power transmission system mathematical model of source transverter topology formation by ring controller inside and outside traditional PI, realizes pair
In the effective control for the ripple voltage and electric current that the Clock Multiplier Factors such as Converter DC-side frequency tripling, six frequencys multiplication, nine frequencys multiplication are 3n；Son
Current reference amount under the dq coordinate systems of the follow-on Novel electric Source Con-verters outer ring controller output of module, by inner ring control
Make the calculating of the PI controllers and the ripple compensation voltage Jing Guo coordinate transform of topology so that in Novel electric Source Con-verters topology
The output of ring controller is for inputting the final control voltage of transverter submodule switching, to inhibit three times of Converter DC-side
Ripple voltages and the electric currents such as frequency.Compared with the mode of traditional increase hardware filtering equipment, by ripple voltage current transformation to together
Ripple harmonics restraint control strategy under rotating coordinate system is walked, efficiently solves Novel electric Source Con-verters topology DC side ripple
The governing problem of voltage and current reduces influence of the ripple current to soft straight transmission system, and method is easy to operate, specific aim
By force, and financial cost has been saved.
Ripple Suppression method in the present embodiment is applied to the back-to-back mould of ± 420/1250MW flexible direct current power transmission systems
In type, after 3n Clock Multiplier Factor Ripple Suppression strategies, compared with before 3n Clock Multiplier Factor Ripple Suppressions, 3n Clock Multiplier Factor ripples contain
Amount is significantly suppressed, and harmonic distortion (THD) is also reduced, and current ripples have obtained apparent inhibition, improve current on valve side
Ripple situation, be conducive to improve energy-storage system power quality.
The present embodiment also provides a kind of transverter Ripple Suppression device, which is used to implement the embodiment party in embodiment
Formula had carried out repeating no more for explanation.Term " module " as used below can realize predetermined function software and/
Or the combination of hardware.Although following embodiment described system is preferably realized with software, hardware or software and
The realization of the combination of hardware is also what may and be contemplated.
Transverter Ripple Suppression device provided in this embodiment is as shown in Figure 10, including：First acquisition module 101, is used for
Obtain the DC side electrical network parameter of transverter and exchange side electrical network parameter；First processing module 102, for according to DC side power grid
Parameter and exchange side electrical network parameter obtain ripple electrical network parameter；Second processing module 103, for being calculated according to ripple electrical network parameter
The offset voltage of Converter DC-side；Second acquisition module 104, for obtaining the modulation voltage of transverter；Third processing module
105, for obtaining the control voltage of transverter according to offset voltage and modulation voltage；Fourth processing module 106, for according to control
Voltage processed controls transverter.
The further function of above-mentioned modules describes same as the previously described embodiments, and details are not described herein.
Above-mentioned transverter Ripple Suppression device has the advantages that control accuracy is high.
The present embodiment also provides a kind of terminal, as shown in figure 11, including：At least one processor 1101, such as CPU
(Central Processing Unit, central processing unit), at least one communication interface 1103, memory 1104 are at least one
Communication bus 1102.Wherein, communication bus 1102 is used to implement the connection communication between these components.Wherein, communication interface
1103 can include display screen (Display), keyboard (Keyboard), and optional communication interface 1103 can also include having for standard
Line interface, wireless interface.Memory 1104 can be high-speed RAM memory (Ramdom Access Memory, effumability with
Machine accesses memory) or non-labile memory (non-volatile memory), for example, at least a disk
Memory.Memory 1104 optionally can also be at least one storage device for being located remotely from aforementioned processor 1101.Wherein
Processor 1101 can store batch processing generation with transverter Ripple Suppression device described in conjunction with Figure 10 in memory 1104
Code, and processor 1101 calls the program code stored in memory 1104, for performing a kind of transverter Ripple Suppression side
Method, i.e., for perform as shown in Figure 1, Figure 2 with the transverter Ripple Suppression method in Fig. 3 embodiments.
Wherein, communication bus 1102 can be Peripheral Component Interconnect standard (peripheral component
Interconnect, abbreviation PCI) bus or expanding the industrial standard structure (extended industry standard
Architecture, abbreviation EISA) bus etc..Communication bus 1102 can be divided into address bus, data/address bus, controlling bus
Deng.For ease of representing, only represented in Figure 11 with a thick line, it is not intended that an only bus or a type of bus.
Wherein, memory 1104 can include volatile memory (English：Volatile memory), such as deposit at random
Access to memory (English：Random-access memory, abbreviation：RAM)；Memory can also include nonvolatile memory
(English：Non-volatile memory), such as flash memory (English：Flash memory), hard disk (English：hard
Disk drive, abbreviation：HDD) or solid state disk is (English：Solid-state drive, abbreviation：SSD)；Memory 1104 is also
It can include the combination of the memory of mentioned kind.
Wherein, processor 1101 can be central processing unit (English：Central processing unit, abbreviation：
CPU), network processing unit (English：Network processor, abbreviation：) or the combination of CPU and NP NP.
Wherein, processor 1101 can further include hardware chip.Above-mentioned hardware chip can be special integrated electricity
Road (English：Application-specific integrated circuit, abbreviation：ASIC), programmable logic device (English
Text：Programmable logic device, abbreviation：PLD) or combination.Above-mentioned PLD can be complicated programmable logic device
Part (English：Complex programmable logic device, abbreviation：CPLD), field programmable gate array (English
Text：Field-programmable gate array, abbreviation：FPGA), Universal Array Logic (English：generic array
Logic, abbreviation：GAL) or it is arbitrarily combined.
Optionally, memory 1104 is additionally operable to storage program instruction.Processor 1101 can be instructed with caller, be realized such as
Transverter Ripple Suppression method shown in the application Fig. 1, Fig. 2 and Fig. 3 embodiment.
The embodiment of the present invention also provides a kind of computer readable storage medium, and meter is stored on computer readable storage medium
Calculation machine executable instruction, the computer executable instructions can perform the transverter Ripple Suppression side in above-mentioned any means embodiment
Method.Wherein, the storage medium can be magnetic disc, CD, read-only memory (Read-Only Memory, ROM), deposit at random
Store up memory body (Random Access Memory, RAM), flash memory (Flash Memory), hard disk (Hard Disk
Drive, abbreviation：) or solid state disk (Solid-State Drive, SSD) etc. HDD；The storage medium can also include above-mentioned
The combination of the memory of type.
It should be understood by those skilled in the art that, the embodiment of the present invention can be provided as method, system or computer program
Product.Therefore, the reality in terms of complete hardware embodiment, complete software embodiment or combination software and hardware can be used in the present invention
Apply the form of example.Moreover, the computer for wherein including computer usable program code in one or more can be used in the present invention
The computer program production that usable storage medium is implemented on (including but not limited to magnetic disk storage, CD-ROM, optical memory etc.)
The form of product.
The present invention be with reference to according to the method for the embodiment of the present invention, the flow of equipment (system) and computer program product
Figure and/or block diagram describe.It should be understood that it can be realized by computer program instructions every first-class in flowchart and/or the block diagram
The combination of flow and/or box in journey and/or box and flowchart and/or the block diagram.These computer programs can be provided
The processor of all-purpose computer, special purpose computer, Embedded Processor or other programmable data processing devices is instructed to produce
A raw machine so that the instruction performed by computer or the processor of other programmable data processing devices is generated for real
The device of function specified in present one flow of flow chart or one box of multiple flows and/or block diagram or multiple boxes.
These computer program instructions, which may also be stored in, can guide computer or other programmable data processing devices with spy
Determine in the computer-readable memory that mode works so that the instruction generation being stored in the computer-readable memory includes referring to
Enable the manufacture of device, the command device realize in one flow of flow chart or multiple flows and/or one box of block diagram or
The function of being specified in multiple boxes.
These computer program instructions can be also loaded into computer or other programmable data processing devices so that counted
Series of operation steps are performed on calculation machine or other programmable devices to generate computer implemented processing, so as in computer or
The instruction offer performed on other programmable devices is used to implement in one flow of flow chart or multiple flows and/or block diagram one
The step of function of being specified in a box or multiple boxes.
Obviously, the above embodiments are merely examples for clarifying the description, and is not intended to limit the embodiments.It is right
For those of ordinary skill in the art, can also make on the basis of the above description it is other it is various forms of variation or
It changes.There is no necessity and possibility to exhaust all the enbodiments.And the obvious variation thus extended out or
Among changing still in the protection domain of the invention.
Claims (14)
- A kind of 1. transverter Ripple Suppression method, which is characterized in that include the following steps：Obtain the DC side electrical network parameter of transverter and exchange side electrical network parameter；Ripple electrical network parameter is obtained according to the DC side electrical network parameter and the exchange side electrical network parameter；The offset voltage of the Converter DC-side is calculated according to the ripple electrical network parameter；Obtain the modulation voltage of the transverter；The control voltage of the transverter is obtained according to the offset voltage and the modulation voltage；The transverter is controlled according to the control voltage.
- 2. transverter Ripple Suppression method according to claim 1, which is characterized in that the DC side electrical network parameter includes DC voltage and DC side electric current；And/orThe exchange side electrical network parameter include exchange side voltage, ac-side current, AC network electromotive force rotation angular frequency with And the phase angle of AC network.
- 3. transverter Ripple Suppression method according to claim 1, which is characterized in that described according to the DC side power grid Parameter and the exchange side electrical network parameter obtain ripple electrical network parameter, including：Fourier decomposition, matrixing and delay are carried out to the DC side electrical network parameter according to the exchange side electrical network parameter Analysis obtains fundametal compoment；Ripple electrical network parameter is calculated according to the fundametal compoment.
- 4. transverter Ripple Suppression method according to claim 3, which is characterized in that the ripple electrical network parameter includes dq The ripple electrical network parameter of predetermined Clock Multiplier Factor under rotating coordinate system.
- 5. transverter Ripple Suppression method according to claim 4, which is characterized in that the predetermined Clock Multiplier Factor is 3n, The n is positive integer.
- 6. transverter Ripple Suppression method according to claim 5, which is characterized in that the dq is obtained by equation below The ripple electrical network parameter of predetermined Clock Multiplier Factor under rotating coordinate system,Wherein, i3nth_dD axis ripple current components for 3n ripple under dq rotating coordinate systems；i3nth_qFor dq rotating coordinate systems Under 3n ripple q axis ripple current components；u3nth_dD axis ripple voltage point for 3n ripple under dq rotating coordinate systems Amount；u3nth_qQ axis ripple voltage components for 3n ripple under dq rotating coordinate systems；θ is the phase angle of AC network；id0For The d axis fundamental current components of fundamental wave under dq rotating coordinate systems；iq0Q axis fundamental current point for the fundamental wave under dq rotating coordinate systems Amount；ud0D axis fundamental voltage components for the fundamental wave under dq rotating coordinate systems；uq0Q axis bases for the fundamental wave under dq rotating coordinate systems Wave voltage component.
- 7. according to any transverter Ripple Suppression methods of claim 3-6, which is characterized in that described according to the fundamental wave After component calculates the step of ripple electrical network parameter, further include：The ripple electrical network parameter is filtered to obtain optimization ripple electrical network parameter.
- 8. transverter Ripple Suppression method according to claim 7, which is characterized in that the benefit is obtained by equation below Repay voltage,Wherein, v 'd3nthFor differenceThe d shaft voltage amounts of the 3n ripple by PI control outputs；v′q3nthFor DifferenceThe q shaft voltage amounts of the 3n ripple by PI control outputs；vd3nthFor under dq rotating coordinate systems The d axis offset voltages of 3n ripple；vq3nthQ axis offset voltages for 3n ripple under dq rotating coordinate systems；id3nthIt is revolved for dq Turn the d axis optimization ripple current component of 3n ripple under coordinate system；iq3nthQ axis for 3n ripple under dq rotating coordinate systems Optimize ripple current component；ud3nthD axis for 3n ripple under dq rotating coordinate systems optimizes ripple voltage component；uq3nthFor The q axis optimization ripple voltage component of 3n ripple under dq rotating coordinate systems；D shaft currents for 3n times given ripple Desired value；Q shaft current desired values for 3n times given ripple；ω is the rotation angular frequency of AC network electromotive force；L For converter bridge arm inductance value.
- 9. according to any transverter Ripple Suppression methods of claim 1-8, which is characterized in that obtained by equation below The control voltage of the transverter,Wherein, vaFor the A phase control voltages in three-phase alternating current；vbFor the B phase control voltages in three-phase alternating current；vcFor three-phase C phase control voltages in alternating current；For the A phase modulation voltages in three-phase alternating current；For the B phases in three-phase alternating current Modulation voltage；For the C phase modulation voltages in three-phase alternating current；va3nthFor the A phase offset voltages in three-phase alternating current； vb3nthFor the B phase offset voltages in three-phase alternating current；vc3nthFor the C phase offset voltages in three-phase alternating current.
- 10. according to any transverter Ripple Suppression methods of claim 1-9, which is characterized in that described according to the control Voltage processed controls the transverter, including：After the modulation that the control of bridge arm current balance, capacitor voltage balance control and level approach is carried out to the control voltage, It obtains MMC and controls the transverter with reference to trigger pulse is involved with reference to trigger pulse, the MMC is involved.
- 11. according to any transverter Ripple Suppression methods of claim 1-10, which is characterized in that obtain the straight of transverter Before the step of flowing side electrical network parameter and exchange side electrical network parameter, further include：Establish flexible direct current power transmission system mathematical model.
- 12. a kind of transverter Ripple Suppression device, which is characterized in that including：First acquisition module, for obtaining the DC side electrical network parameter of transverter and exchange side electrical network parameter；First processing module, for obtaining ripple power grid ginseng according to the DC side electrical network parameter and the exchange side electrical network parameter Number；Second processing module, for calculating the offset voltage of the Converter DC-side according to the ripple electrical network parameter；Second acquisition module, for obtaining the modulation voltage of the transverter；Third processing module, for obtaining the control voltage of the transverter according to the offset voltage and the modulation voltage；Fourth processing module, for controlling the transverter according to the control voltage.
- 13. a kind of terminal, which is characterized in that including：At least one processor and connect at least one processor communication The memory connect, wherein, the memory is stored with the instruction that can be performed by least one processor, and described instruction is by institute It states at least one processor to perform, so that at least one processor performs any described in the claims 1-11 change Flow device Ripple Suppression method.
- 14. a kind of computer readable storage medium, which is characterized in that the computer-readable recording medium storage has computer to refer to It enables, the computer instruction is used to that the computer to be made to perform any transverter ripple suppression in the claims 1-11 Method processed.
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| CN111525604A (en) * | 2020-05-26 | 2020-08-11 | 南方电网科学研究院有限责任公司 | Method and system for suppressing harmonic waves of flexible direct current transmission and computer equipment |
| CN112688327A (en) * | 2021-01-07 | 2021-04-20 | 广东电网有限责任公司阳江供电局 | AC/DC filtering control method, device and system for DC power transmission system |
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| JP4328241B2 (en) * | 2004-02-26 | 2009-09-09 | 東京電力株式会社 | Active filter for power |
| CN102684198A (en) * | 2012-05-29 | 2012-09-19 | 电子科技大学 | Harmonic suppression method of bidirectional converter of energy accumulation unit in wind and light accumulation system |
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| JP4328241B2 (en) * | 2004-02-26 | 2009-09-09 | 東京電力株式会社 | Active filter for power |
| CN102684198A (en) * | 2012-05-29 | 2012-09-19 | 电子科技大学 | Harmonic suppression method of bidirectional converter of energy accumulation unit in wind and light accumulation system |
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| CN111525604A (en) * | 2020-05-26 | 2020-08-11 | 南方电网科学研究院有限责任公司 | Method and system for suppressing harmonic waves of flexible direct current transmission and computer equipment |
| CN112688327A (en) * | 2021-01-07 | 2021-04-20 | 广东电网有限责任公司阳江供电局 | AC/DC filtering control method, device and system for DC power transmission system |
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