CN109217346A - Back-to-back DC power transmission system and control method based on virtual synchronous machine - Google Patents
Back-to-back DC power transmission system and control method based on virtual synchronous machine Download PDFInfo
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- CN109217346A CN109217346A CN201710547610.7A CN201710547610A CN109217346A CN 109217346 A CN109217346 A CN 109217346A CN 201710547610 A CN201710547610 A CN 201710547610A CN 109217346 A CN109217346 A CN 109217346A
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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
- H02J3/18—Arrangements for adjusting, eliminating or compensating reactive power in networks
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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
- H02J3/24—Arrangements for preventing or reducing oscillations of power in networks
-
- 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
- H02J3/38—Arrangements for parallely feeding a single network by two or more generators, converters or transformers
-
- 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
- H02J3/38—Arrangements for parallely feeding a single network by two or more generators, converters or transformers
- H02J3/388—Islanding, i.e. disconnection of local power supply from the network
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E40/00—Technologies for an efficient electrical power generation, transmission or distribution
- Y02E40/30—Reactive power compensation
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- 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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- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Supply And Distribution Of Alternating Current (AREA)
- Control Of Eletrric Generators (AREA)
Abstract
The present invention relates to back-to-back DC power transmission systems and control method based on virtual synchronous machine, the inverter being directly connected in system comprising two DC sides, the difference of the DC voltage instruction of the actual DC voltage and setting of acquisition, adjusts through adjuster, generates the first power difference；The second mechanical output that active adjusting is carried out in the virtual synchronous machine control model of second inverter is negated, and it sums with the first power difference, as the first mechanical output for carrying out active adjusting in the virtual synchronous machine control model of the first inverter, first, second mechanical output is for generating first, the electrical angle of second inverter alternating current, the present invention is based on the back-to-back DC power transmission systems of virtual synchronous machine technology, it can be reduced in generating set installed capacity demand, in the case that power grid equivalent rotary inertia reduces, effectively improve the fm capacity of system, guarantee safe and stable operation of power system.
Description
Technical field
The invention belongs to high voltage power transmission fields, and in particular to back-to-back DC power transmission system and control based on virtual synchronous machine
Method processed.
Background technique
With the propulsion that the adjustment of China's energy resource structure and power grid construction are planned, flexible HVDC transmission system is active with its
Power, reactive power are independent flexibly controllable, are not necessarily to line commutation voltage, can be answered extensively to advantages such as Tertiary in Gudao area power supplies
With, and develop towards the direction of high-voltage large-capacity.
Currently, the voltage source converter HVDC transmission system based on all-controlling power electronics device
(Voltage Source Converter Based High Voltage Direct Current, VSC-HVDC) is mostly used often
The Direct Current Control based on the bicyclic decoupling of PI under synchronous rotating frame of rule, active and reactive class controls mesh in such control
Mark is mostly fixed numbers, can not active response system voltage and frequency variation, large capacity VSC can not be played to AC system
Voltage, frequency support effect.And VSC shows as zero Inertia Characteristics, as permeability of the VSC-HVDC in power grid is continuous
It improves, generating set installed capacity demand is accordingly reduced in electric system, and power grid equivalent rotary inertia reduces, and leads to system frequency modulation
Ability obviously weakens, and is highly detrimental to safe and stable operation of power system.In addition, VSC-HVDC needs to lead under conventional control mode
The switching for crossing control model is realized to run without interruption under isolated island and networked mode, this pattern switching strategy to VSC smooth and seamless
Very high requirement is proposed, Control System Design difficulty is not only increased, and is difficult to avoid that the electrical impact in handoff procedure,
It is unfavorable for the power supply of load safety and stability.
In recent years, the VSC control technology based on virtual synchronous generator is gradually sent out in the systems such as micro-capacitance sensor, wind-power electricity generation
Exhibition is got up, and by mechanical, the electrical equation of simulation conventional synchronization generator and frequency modulation, Regulation Control etc., embodies VSC
The operation characteristic of synchronous generator out to actively adjust power system voltage and frequency, and is suitable for single machine and multi-machine parallel connection
Operation.This great reference value for VSC-HVDC system solves the above problems.
Entitled " virtual synchronous generator techniques and the exhibition of " Automation of Electric Systems " periodical the 21st phase of volume 39
Hope " paper virtual synchronous generator (VSG) and its operation control strategy, as shown in Figure 1, the virtual synchronous generator
Including main circuit and control system, control system be realize virtual synchronous generator core, mainly include VSG ontology model and
Control algolithm, control algolithm mainly simulate the active frequency modulation and the features such as idle pressure regulation of synchronous generator from external characteristics, wherein
Active-frequency control virtual machine torque output regulation power is controlled by detection difference power Δ P, as shown in Figure 2.
But academic circles at present is for virtual synchronous machine (Virtual Synchronous Machine, VSM) technology
Research is only conceived to separate unit VSC or its frequency modulation, Regulation Control.Composition is directly connected to without DC line applied to DC side
When back-to-back VSC-HVDC system, how to ensure the DC voltage stability of back-to-back system (CCC-0), while realizing both-end AC system
Frequency control, and any end AC system isolated island operating condition is adapted to, it is that the technology promotes faced head to VSC-HVDC system
Problem is wanted, needs to carry out in-depth study.
Summary of the invention
The object of the present invention is to provide back-to-back DC power transmission systems and control method based on virtual synchronous machine, are used for
In the case that generating set installed capacity demand is reduced, power grid equivalent rotary inertia reduces, the fm capacity of system is effectively improved,
Guarantee safe and stable operation of power system.
In order to solve the above technical problems, the present invention proposes a kind of back-to-back DC power transmission system control based on virtual synchronous machine
Method processed, comprising the following steps:
The DC transmission system is controlled using virtual synchronous machine, the first inverter and the second inverter being provided with point
Not by respective active adjusting, Reactive-power control, respective mechanical output and reference voltage amplitude are generated, by virtual synchronous machine
Ontology algorithm generates the modulating wave of control the first inverter and the second inverter respectively；
Wherein, the difference of the actual DC voltage of acquisition and the instruction of the DC voltage of setting, is adjusted through adjuster, generates the
One power difference；The mechanical output of second inverter is negated, and is summed with first power difference, as the first inverter
Mechanical output.
Pass through the power instruction that will be set, the second active regulation power obtained according to the frequency controller of the second inverter
Difference and according to the frequency controller of the first inverter obtain the first active regulation power difference sum, obtain institute
State the mechanical output of the second inverter.
The second frequency of setting is instructed, it is poor to make with the second actual frequency of the second inverter detection, active multiplied by second
Adjustment factor obtains the described second active regulation power difference；The first frequency of setting is instructed, with the detection of the first inverter
It is poor that first actual frequency is made, and multiplied by the first active adjustment coefficient, obtains the described first active regulation power difference.
The Reactive-power control of first inverter includes following sub-step:
It is poor to make by the first reactive command of setting, with the first practical reactive power of the first inverter detection, multiplied by first
Reactive-power control coefficient obtains the first inverter reference voltage first and adjusts difference；It is changed by the first voltage instruction of setting, with first
The practical alternating voltage work for flowing device detection is poor, adjusts by adjuster, obtains the first inverter reference voltage second and adjusts difference；
By the first inverter reference voltage first adjust difference, the first inverter reference voltage second adjust difference,
It instructs and sums with the first voltage of setting, generate the reference voltage amplitude of the first inverter.
The Reactive-power control of second inverter includes following sub-step:
It is poor to make by the second reactive command of setting, with the second practical reactive power of the second inverter detection, multiplied by second
Reactive-power control coefficient obtains the second inverter reference voltage first and adjusts difference；It is changed by the second voltage instruction of setting, with second
The practical alternating voltage work for flowing device detection is poor, adjusts by adjuster, obtains the second inverter reference voltage second and adjusts difference；
By the second inverter reference voltage first adjust difference, the second inverter reference voltage second adjust difference, with set
Fixed second voltage instructs summation, generates the reference voltage amplitude of the second inverter.
In order to solve the above technical problems, the present invention also proposes a kind of back-to-back DC power transmission system based on virtual synchronous machine
System, further includes the first active adjustment module, second including the first inverter and the second inverter that two DC sides are directly connected to
Active adjustment module, virtual synchronous machine ontology algoritic module；
Second active adjustment module: for generating the mechanical output of the second inverter；
First active adjustment module: for will the actual DC voltage that acquired and setting DC voltage instruction difference,
It is adjusted through adjuster, generates the first power difference；The mechanical output of second inverter is negated, and with first power difference
Summation, the mechanical output as the first inverter；
Virtual synchronous machine ontology algoritic module: for according to the first active adjustment module, the second active adjustment module it is defeated
Out, alternating current instruction and the phase angle of the first inverter and the second inverter are generated respectively.
The second active adjustment module is also used to by the power instruction that will set, according to the frequency control of the second inverter
The the second active regulation power difference and the first active tune obtained according to the frequency controller of the first inverter that device processed obtains
Section power difference is summed, and the mechanical output of second inverter is obtained.
The second frequency of setting is instructed, it is poor to make with the second actual frequency of the second inverter detection, active multiplied by second
Adjustment factor obtains the described second active regulation power difference；The first frequency of setting is instructed, with the detection of the first inverter
It is poor that first actual frequency is made, and multiplied by the first active adjustment coefficient, obtains the described first active regulation power difference.
It further include the first Reactive-power control module: the first reactive command for that will set, the with the detection of the first inverter
It is poor that one practical reactive power is made, and multiplied by the first Reactive-power control coefficient, obtains the first inverter reference voltage first and adjusts difference；It will
It is poor that the first voltage instruction of setting and the practical alternating voltage of the first inverter detection are made, and adjusts by adjuster, obtains first
Inverter reference voltage second adjusts difference；The first inverter reference voltage first is adjusted into difference, the first inverter ginseng
It examines voltage regulation two and adjusts difference, the first voltage instruction summation with setting, generate the reference voltage amplitude of the first inverter.
It further include the second Reactive-power control module: the second reactive command for that will set, the with the detection of the second inverter
It is poor that two practical reactive powers are made, and multiplied by the second Reactive-power control coefficient, obtains the second inverter reference voltage first and adjusts difference；It will
It is poor that the second voltage instruction of setting and the practical alternating voltage of the second inverter detection are made, and adjusts by adjuster, obtains second
Inverter reference voltage second adjusts difference；The second inverter reference voltage first is adjusted into difference, the second inverter ginseng
It examines voltage regulation two and adjusts difference, the second voltage instruction summation with setting, generate the reference voltage amplitude of the second inverter.
The beneficial effects of the present invention are: the difference of the DC voltage instruction of the actual DC voltage and setting of acquisition, through adjusting
It saves device to adjust, generates the first power difference；The of active adjusting will be carried out in the virtual synchronous machine control model of second inverter
Two mechanical outputs negate, and sum with first power difference, as in the virtual synchronous machine control model of the first inverter
Carry out the first mechanical output of active adjusting；First, second mechanical output is used to generate the electricity of the first, second inverter alternating current
Angle, the present invention is based on the back-to-back DC power transmission systems of virtual synchronous machine technology, can subtract in generating set installed capacity demand
Less, in the case that power grid equivalent rotary inertia reduces, the fm capacity of system is effectively improved, guarantees that power system security stablizes fortune
Row.
The present invention carries out DC voltage control, the second inverter progress active power controller and both-end in the first inverter and hands over
While streaming system frequency controls, two converter stations also carry out Reactive-power control respectively, can effectively improve voltage, the frequency of AC system
Rate stability, and ensure direct current system operational reliability, meanwhile, networking/isolated island operating condition is able to achieve without control model adjustment
Seamless switching, have good technical advance.
Detailed description of the invention
Fig. 1 is the circuit theory schematic diagram of virtual synchronous generator in the prior art；
Fig. 2 is active-frequency control schematic diagram of virtual synchronous generator in the prior art；
Fig. 3 is back-to-back VSC-HVDC system virtualization synchronous machine control program schematic diagram；
Fig. 4 is virtual synchronous machine ontology algoritic module detail view.
Specific embodiment
A specific embodiment of the invention is further described with reference to the accompanying drawing.
A kind of embodiment of back-to-back DC power transmission system based on virtual synchronous machine of the invention:
VSC-HVDC as shown in Figure 3, the system is containing there are two inverter VSC1And VSC2, wherein VSC1For first change of current
Device, active adjusting part carry out DC voltage control, VSC2For the second inverter, active adjusting part carries out active power
Control.VSC1And VSC2Control system include virtual synchronous machine control and current control and modulation two parts.Wherein, virtually
Synchronous machine control section is by the first active adjustment module, the first Reactive-power control module, the second active adjustment module, the second idle tune
It saves module and virtual synchronous machine ontology algoritic module is constituted, the detailed process of virtual synchronous machine ontology algorithm is as shown in Figure 4.
VSCiThe current-order i that (wherein i is 1 or 2) exports virtual synchronous machine ontology algoritic moduleabciWith alternating current angle, θiAs
The input of rear class part, and closed-loop control is carried out to it, to generate VSCiModulating wave, above-mentioned iabciAnd θiIn i be 1 or
2, iabc1For the first inverter VSC1The alternating current of output instructs, iabc2For the second inverter VSC2The alternating current of output refers to
It enables, θ1For the first inverter VSC1The phase angle of output, θ2For the second inverter VSC2The phase angle of output.
VSC1The first active adjustment module in include DC voltage closed-loop control, to maintain system dc voltage steady
It is fixed, the control algolithm taken are as follows: by DC voltage actual value UdcrefWith the instruction value U of settingdcrefIt makes the difference, by ratio product
Divide adjuster to adjust, obtains active power regulation amount △ P1, as the first power difference, the first power difference and VSC2Had
The mechanical output P that function is adjustedm2Inverted value be added, and obtain VSC1Carry out the first mechanical output P of active adjustingm1。
VSC1The first Reactive-power control module in, by the first reactive command Q of settingref1, with the detection of the first inverter the
One practical reactive power Q1It is poor to make, multiplied by the first Reactive-power control coefficient kq1, obtain VSC1Reference voltage first adjusts difference；It will set
Fixed first voltage instructs Uacref1And the practical alternating voltage U of the first inverter detectionac1It is poor to make, by regulator AVR tune
Section, obtains VSC1Reference voltage second adjusts difference；By VSC1Reference voltage first adjusts difference, VSC1Reference voltage second is adjusted
Save difference, the first voltage instruction E with setting1Summation generates the reference voltage amplitude E of the first inverterp1。
VSC2The second active adjustment module then include setting function power instruction PrefAnd frequency modulation control link, to control
Direct current system effective power flow processed, while the frequency for carrying out both-end AC system supports control, the control algolithm taken are as follows: by the
One frequency instruction value fref1With VSC1Frequency actual measured value f1It makes the difference, and is adjusted by proportional controller, obtain carrying out active
The the first active regulation power difference △ P adjustedf1, meanwhile, by VSC2Second frequency instruction value fref2With frequency actual measurement
Value f2It makes the difference, also passes through proportional controller, obtain the second active regulation power difference △ P for carrying out active adjustingf2, △ Pf1、
△Pf2P is instructed with the active power of settingrefIt is added, as VSC2Carry out the second mechanical output P of active adjustingm2。
VSC2The second Reactive-power control module in, by the second reactive command Q of settingref2, with the detection of the second inverter the
Two practical reactive power Qs2It is poor to make, multiplied by the second Reactive-power control coefficient kq2, obtain VSC2Reference voltage first adjusts difference；It will set
Fixed second voltage instructs Uacref2And the practical alternating voltage U of the second inverter detectionac2It is poor to make, by regulator AVR tune
Section, obtains VSC2Reference voltage second adjusts difference；By VSC2Reference voltage first adjusts difference, VSC2Reference voltage second is adjusted
Save difference, the second voltage instruction E with setting2Summation generates the reference voltage amplitude E of the second inverterp2。
Due to VSC1And VSC2Using the back-to-back mode of connection, therefore frequency measurement and mechanical output are carried out therebetween
The alternating transmission of instruction has timeliness and convenience.
In back-to-back VSC-HVDC system both-end networking operation, VSC2It adjusts active power and instructs PrefTo change and this
The effective power flow transmission of AC system is held, in order to maintain system dc voltage stabilization, VSC1Synchronous adjustment power is needed, in this hair
Under the control program of bright patent, the active power instruction for needing to adjust has been used as feedforward term to be added to mechanical output instruction Pm1When
In, therefore DC voltage closed-loop control part only needs the △ P of output very little1Compensation transient state adjustment process in fluctuating power be
Can, it is based on this scheme, the DC voltage stability performance of system is ensured well, to ensure system operation reliability.
In addition, if any end AC system occurs transient power and disturbs and AC system frequency is caused to fluctuate, VSC2
The second mechanical output P can be timely adjusted according to double ended system frequency fluctuation situationm2, namely adjust the active of VSC-HVDC system
Trend, so that the power disturbance of sharing system improves both-end AC system frequency to inhibit the fluctuation of both-end AC system frequency
Stability.
And when back-to-back VSC-HVDC system any end fault in ac transmission system enters isolated island operating condition, it is each to hold converter station empty
The effect of rotary inertia can adjust the active output of VSC-HVDC quickly to inhibit system frequency in quasi- synchronous machine ontology algorithm
Quick variation.At the same time, VSC2The alternating current in frequency control and each station Reactive-power control module in active adjustment module
Voltage-controlled system can reduce the wave of isolated island end AC system frequency and voltage magnitude by changing mechanical output and alternating voltage amplitude
Momentum realizes networking/isolated island operating condition switching of smooth and seamless to ensure that the stability of AC system under isolated island operating condition.Together
Sample, VSC1It still can be in Pm2Feedforward action under quickly systems stabilisation DC voltage, so that safeguards system is reliable for operation
Property.
In conjunction with the above analysis it is found that back-to-back VSC-HVDC system virtualization synchronous machine control program proposed by the present invention, energy
Voltage, the frequency stability of AC system are enough effectively improved, and ensures direct current system operational reliability, meanwhile, without controlling mould
Formula adjustment is able to achieve networking/isolated island operating condition seamless switching, has good technical advance.
The invention also provides a kind of back-to-back DC power transmission system control method based on virtual synchronous machine, including it is following
Step: DC transmission system is controlled using virtual synchronous machine, wherein the first inverter and the second inverter pass through respective respectively
Active adjusting, Reactive-power control generate respective mechanical output and reference voltage amplitude, by virtual synchronous machine ontology algorithm, divide
The modulating wave for changing first-class device and the second inverter Sheng Cheng not controlled；Wherein, the actual DC voltage of acquisition and the direct current of setting
It is poor that voltage instruction is made, and adjusts through adjuster, generates the first power difference；The mechanical output of second inverter is negated, and with
The summation of one power difference, the mechanical output as the first inverter.
Above-mentioned back-to-back DC power transmission system control method actually uses the back of the invention based on virtual synchronous machine
The control method used in the examples of backrest DC transmission system, due to the introduction to the control method in the above-described embodiments
Sufficiently clear is complete, therefore no longer the embodiment of the control method of back-to-back inverter is described in detail.
The above embodiments are merely illustrative of the technical scheme of the present invention and are not intended to be limiting thereof, and those skilled in the art reads
After reader application, referring to the behavior of various modifications or change that above-described embodiment carries out the present invention, in the invention patent
Within the scope of right application is claimed.
Claims (10)
1. a kind of back-to-back DC power transmission system control method based on virtual synchronous machine, which comprises the following steps:
The DC transmission system is controlled using virtual synchronous machine, and the first inverter and the second inverter being provided with lead to respectively
Respective active adjusting, Reactive-power control are crossed, respective mechanical output and reference voltage amplitude are generated, by virtual synchronous machine ontology
Algorithm generates the modulating wave of control the first inverter and the second inverter respectively；
Wherein, the difference of the actual DC voltage of acquisition and the instruction of the DC voltage of setting, is adjusted through adjuster, generates the first function
Rate difference；The mechanical output of second inverter is negated, and is summed with first power difference, the machine as the first inverter
Tool power.
2. the back-to-back DC power transmission system control method according to claim 1 based on virtual synchronous machine, feature exist
In, the second active regulation power difference for being obtained by the power instruction that will set, according to the frequency controller of the second inverter,
And summed according to the first active regulation power difference that the frequency controller of the first inverter obtains, obtain described second
The mechanical output of inverter.
3. the back-to-back DC power transmission system control method according to claim 2 based on virtual synchronous machine, feature exist
In, the second frequency of setting is instructed, it is poor with the second actual frequency work of the second inverter detection, be multiplied by the second active adjusting
Number, obtains the described second active regulation power difference；The first frequency of setting is instructed, it is real with the first of the first inverter detection
It is poor that border frequency is made, and multiplied by the first active adjustment coefficient, obtains the described first active regulation power difference.
4. the back-to-back DC power transmission system control method according to claim 1-3 based on virtual synchronous machine,
It is characterized in that, the Reactive-power control of first inverter includes following sub-step:
It is poor to make by the first reactive command of setting, with the first practical reactive power of the first inverter detection, idle multiplied by first
Adjustment factor obtains the first inverter reference voltage first and adjusts difference；First voltage instruction and the first inverter by setting
It is poor that the practical alternating voltage of detection is made, and adjusts by adjuster, obtains the first inverter reference voltage second and adjusts difference；
By the first inverter reference voltage first adjust difference, the first inverter reference voltage second adjust difference, with set
Fixed first voltage instructs summation, generates the reference voltage amplitude of the first inverter.
5. the back-to-back DC power transmission system control method according to claim 1-3 based on virtual synchronous machine,
It is characterized in that, the Reactive-power control of second inverter includes following sub-step:
It is poor to make by the second reactive command of setting, with the second practical reactive power of the second inverter detection, idle multiplied by second
Adjustment factor obtains the second inverter reference voltage first and adjusts difference；Second voltage instruction and the second inverter by setting
It is poor that the practical alternating voltage of detection is made, and adjusts by adjuster, obtains the second inverter reference voltage second and adjusts difference；
Second inverter reference voltage first is adjusted into difference, the second inverter reference voltage second adjusting difference and setting
Second voltage instruction summation, generates the reference voltage amplitude of the second inverter.
6. a kind of back-to-back DC power transmission system based on virtual synchronous machine, first change of current being directly connected to including two DC sides
Device and the second inverter, which is characterized in that further include the first active adjustment module, the second active adjustment module, virtual synchronous machine
Ontology algoritic module；
Second active adjustment module: for generating the mechanical output of the second inverter；
First active adjustment module: for will the actual DC voltage that acquired and setting DC voltage instruction difference, through adjusting
It saves device to adjust, generates the first power difference；The mechanical output of second inverter is negated, and is asked with first power difference
With mechanical output as the first inverter；
Virtual synchronous machine ontology algoritic module: for the output according to the first active adjustment module, the second active adjustment module, divide
Alternating current instruction and the phase angle of the first inverter and the second inverter are not generated.
7. the back-to-back DC power transmission system according to claim 6 based on virtual synchronous machine, which is characterized in that described
Two active adjustment modules be also used to by the power instruction that will set, obtained according to the frequency controller of the second inverter second
Active regulation power difference and the first active regulation power difference progress obtained according to the frequency controller of the first inverter
Summation, obtains the mechanical output of second inverter.
8. the back-to-back DC power transmission system according to claim 7 based on virtual synchronous machine, which is characterized in that will set
Second frequency instruction, with the second inverter detection the second actual frequency make it is poor, multiplied by the second active adjustment coefficient, obtain institute
State the second active regulation power difference；The first frequency of setting is instructed, is made with the first actual frequency of the first inverter detection
Difference obtains the described first active regulation power difference multiplied by the first active adjustment coefficient.
9. according to the described in any item back-to-back DC power transmission systems based on virtual synchronous machine of claim 6-8, feature exists
In further including the first Reactive-power control module: the first reactive command for that will set, with it is the first of the detection of the first inverter practical
It is poor that reactive power is made, and multiplied by the first Reactive-power control coefficient, obtains the first inverter reference voltage first and adjusts difference；By setting
It is poor that the practical alternating voltage of first voltage instruction and the detection of the first inverter is made, and adjusts by adjuster, obtains the first inverter
Reference voltage second adjusts difference；The first inverter reference voltage first is adjusted into difference, the first inverter reference voltage
Second adjusts difference, the first voltage instruction summation with setting, generates the reference voltage amplitude of the first inverter.
10. according to the described in any item back-to-back DC power transmission systems based on virtual synchronous machine of claim 6-8, feature exists
In further including the second Reactive-power control module: the second reactive command for that will set, with it is the second of the detection of the second inverter practical
It is poor that reactive power is made, and multiplied by the second Reactive-power control coefficient, obtains the second inverter reference voltage first and adjusts difference；By setting
It is poor that the practical alternating voltage of second voltage instruction and the detection of the second inverter is made, and adjusts by adjuster, obtains the second inverter
Reference voltage second adjusts difference；The second inverter reference voltage first is adjusted into difference, the second inverter reference voltage
Second adjusts difference, the second voltage instruction summation with setting, generates the reference voltage amplitude of the second inverter.
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| CN201710547610.7A CN109217346B (en) | 2017-07-06 | 2017-07-06 | Back-to-back direct current power transmission system based on virtual synchronous machine and control method |
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| CN201710547610.7A CN109217346B (en) | 2017-07-06 | 2017-07-06 | Back-to-back direct current power transmission system based on virtual synchronous machine and control method |
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| CN110571849A (en) * | 2019-08-20 | 2019-12-13 | 南京国电南自电网自动化有限公司 | Rapid control method for responding to power instruction by virtual synchronous machine |
| CN110896226A (en) * | 2019-11-29 | 2020-03-20 | 国网江苏省电力有限公司常州供电分公司 | Improved direct power control method of flexible direct current transmission system |
| US11735928B2 (en) | 2020-04-17 | 2023-08-22 | Hitachi Energy Switzerland Ag | Multi-port grid forming control for grid interties |
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| US11735928B2 (en) | 2020-04-17 | 2023-08-22 | Hitachi Energy Switzerland Ag | Multi-port grid forming control for grid interties |
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