CN110034586A - A kind of MMC-HVDC island-grid active/passive method for handover control - Google Patents
A kind of MMC-HVDC island-grid active/passive method for handover control Download PDFInfo
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- CN110034586A CN110034586A CN201910388781.9A CN201910388781A CN110034586A CN 110034586 A CN110034586 A CN 110034586A CN 201910388781 A CN201910388781 A CN 201910388781A CN 110034586 A CN110034586 A CN 110034586A
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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
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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
- H02J3/38—Arrangements for parallely feeding a single network by two or more generators, converters or transformers
- H02J3/381—Dispersed generators
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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
- H02J3/38—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
- Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
- Y02E60/60—Arrangements for transfer of electric power between AC networks or generators via a high voltage DC link [HVCD]
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Abstract
A kind of MMC-HVDC island-grid active/passive method for handover control is a kind of control method that island-grid can be made to realize smoothly stable switching in active/passive switching moment.The method firstly the need of judging when island-grid is in active electric network state, electricity generation system whether normal operation, if electricity generation system is to operate normally, then island-grid is continually maintained in the operation of active electric network state；Phenomena such as failure is out of service, therefore island-grid can generate active power shortage if electricity generation system is met, and leads to mains frequency oscillation, dynamic load variation.At this time, it may be necessary to which phase angle is added in this switching moment with amiable exterior ring power optimal control method, switching moment each electrical quantity fluctuation is set to reach minimum, system is gradually recovered stabilization.Finally, island-grid is made smoothly to switch to passive network state.This method can improve island-grid in the reliability of switching moment, while also can guarantee that island-grid can all operate normally under active and passive states, enhance the stability of system.
Description
Technical field
The present invention relates to flexible direct-current transmission fields, and in particular to a kind of MMC-HVDC island-grid active/passive switching
Control method.
Background technique
Island-grid refers to by the locality power grid of the mutual joint mapping of multiple groups compact electrical generating systems, as island-grid obtains
Constantly expand and exploitation, the power supply that island-grid inside configures will be unable to the increase for meeting its power load amount, just need at this time
Increase new power supply, but since isolated island electricity generation system capacity is limited, can take and meet use in the way of external power supply
Electricity needs.
Nowadays, flexible DC transmission technology is widely applied in multiple fields, wherein by flexible DC transmission skill
Art powers island-grid to have obtained more and more concerns.Compared to traditional voltage source type converter, 2002 by Germany
Scholar propose Modular multilevel converter (Modular Multilevel Converter, MMC) have modularized design,
The advantages that level number of output voltage is more, waveform quality is high, switching frequency is low, loss is small, can preferably realize to active
The function that network, passive network, weak AC network are powered, is used widely in flexible DC transmission engineering.Therefore, MMC-
HVDC is played an important role in island-grid for electrical domain.
During island-grid becomes passive network from active electric network, each electrical quantity will generate obvious wave in island-grid
It is dynamic, stability can not be restored in the short time.To sum up, in order to guarantee reliability that MMC-HVDC powers to island-grid, research
MMC-HVDC is of great significance in the control method that island-grid is in the active/passive network switching moment.
Summary of the invention
The purpose of the present invention is to provide a kind of MMC-HVDC island-grid active/passive method for handover control, be used for
A kind of method for controlling power supply that MMC-HVDC is provided to island-grid when being in switching moment, because when island-grid is carrying out
When active/passive network switching, it may appear that each electrical quantity vibration such as frequency, alternating voltage caused by network re-active power is uneven
It swings, system is made to play pendulum, this control method can realize island-grid in the smooth stabilization of active/passive switching moment
Operation guarantees that each electrical quantity oscillation reaches minimum in switching moment, island-grid is made faster to reach stable.
To achieve the above object, the present invention adopts the following technical scheme:
A kind of MMC-HVDC island-grid active/passive method for handover control provided by the invention, it is based on modularization
What the flexible HVDC transmission system of multilevel converter (Modular Multilevel Converter, MMC) was realized, i.e. MMC-
HVDC, this system mainly includes the direct current transportation circuit of two sides AC network, both ends inverter and centre, in the inverter of both ends
Inverter work in one end works in rectification mode, other end inverter in inverter mode；The modularization multi-level converter by
Upper and lower bridge arm is connected in series by bridge arm reactor, wherein and upper and lower bridge arm is connected in series by the identical half-bridge submodule of quantity,
Each submodule is by two IGBT, two sustained diodes1And D2An and sub- module capacitance composition；It is described to island-grid
The MMC-HVDC system of power supply, sending end AC network are considered as Infinite bus system, and receiving end island-grid is by electricity generation system, quiet dynamic
Load composition.
A kind of MMC-HVDC island-grid active/passive method for handover control provided by the invention, specifically includes that outer ring
Power optimization control and phase angle model- following control are combined with inner ring current control, make island-grid in the active switching to passive network
Quarter reaches active power balance, realizes that the smooth of island-grid stablizes switching, it is ensured that island-grid is cut in active, passive and the two
It changes and operates normally constantly, guarantee the reliability of MMC-HVDC power supply.
The MMC-HVDC system is in control method when active electric network to island-grid, refers at island-grid
When active electric network, MMC-HVDC System control structures are mainly set by outer loop control link, inner ring current control link, phaselocked loop
Link composition is counted, due to DC transmission system it has to be ensured that the stabilization of DC voltage stablized and ensure inverter side alternating voltage
Output, therefore, rectification side using constant DC voltage control and determines Reactive Power Control in outer loop control link, and inverter side is using fixed
Active power controller is controlled with alternating voltage is determined.
The MMC-HVDC system is in control method when passive network to island-grid, refers at island-grid
When passive network, MMC-HVDC System control structures are mainly made of outer loop control link, inner ring current control link, due to
MMC needs are connect with passive network, in order to realize the reliable power supply to passive network, passive network need MMC output amplitude with
The alternating voltage of frequency stabilization, so retain inner ring current control, in outer loop control link rectification side using determine DC voltage with
Determine Reactive Power Control, inverter side is controlled using alternating voltage is determined.
The island-grid is referred to by the switching moment of active electric network to passive network when island-grid is in active net
When network, if electricity generation system is removed in isolated island or chance failure is out of service, it can determine whether that island-grid is changed by active electric network at this time
At passive network, and this is become to the switching command of passive network as island-grid from active electric network.
The MMC-HVDC island-grid active/passive method for handover control refers to due to when island-grid is in nothing
When source network, phase angle model- following control and exterior ring power optimal control are added in switching control strategy.
Phase angle model- following control refers to the control of MMC rectification side and inverter side due to when island-grid is in passive network
Phase needed for device and modulation module is directly given as the π of θ=2 f0T, in order to make the power grid phase angle of MMC converter station before the handover after
It is consistent, so being the π of θ=2 f by coordinate transform rotational angle settings0+δ1, δ1For the power grid phase angle of switching moment locking, utilize
Retainer can realize that phase angle follows function.
Exterior ring power optimal control refers to when island-grid is in handoff procedure, out of service to make up electricity generation system
Active power shortage afterwards uses exterior ring power Optimal Control Strategy in handoff procedure, the reference value of active power is adjusted to
The 90% of island-grid active power peak value, before power is not up to the 90% of island-grid active power peak value, outer ring control
System aspect first keeps work by Active Power Controller, constant power reach island-grid active power peak value 90% after adopt again
With the controller for determining alternating voltage, the stable operation of island-grid is realized.
Compared with prior art, the beneficial effects of the present invention are:
1, flexible DC transmission technology is using MMC topology in the present invention, electricity of the MMC with modular construction, output voltage
The advantages that flat number is more, waveform quality is high, switching frequency is low, loss is small, may be implemented the flexible variation of voltage and power grade；
2, in the present invention when island-grid is in switching moment, in order to make the power grid phase angle of MMC converter station before the handover
After be consistent, in switching moment use phase angle model- following control strategy, can guarantee switching moment alternating voltage, DC voltage
Etc. electrical quantity fluctuation it is minimum；
3, in the present invention when island-grid is in switching moment, using exterior ring power Optimal Control Strategy, power not
Before reach island-grid active power peak value 90%, work is first kept by Active Power Controller in terms of outer loop control, etc.
Power reach island-grid active power peak value 90% after again using determine the controller of alternating voltage, realization the whole network wattful power
Rate balance, smoothly switches island-grid to passive network state.
Detailed description of the invention
Fig. 1 is the flow chart of island-grid active/passive method for handover control in the present invention；
Fig. 2 is the structure chart of MMC topology in the present invention；
Fig. 3 is the MMC-HVDC system construction drawing powered in the present invention to island-grid；
Fig. 4 is two close cycles vector controlled block diagram of the MMC-HVDC when island-grid is in active electric network in the present invention；
Fig. 5 is that MMC-HVDC is when island-grid is in passive network in the present invention, rectification side two close cycles vector controlled frame
Figure；
Fig. 6 is that MMC-HVDC is when island-grid is in passive network in the present invention, inverter side two close cycles vector controlled frame
Figure；
Fig. 7 has the control block diagram in the active/passive network switching moment in island-grid for MMC-HVDC in the present invention.
Specific embodiment
The present invention is described in further details with reference to the accompanying drawing.
Such as Fig. 1, a kind of flow chart of MMC-HVDC island-grid active/passive method for handover control is provided, it is specific real
Apply that steps are as follows:
Step 1: firstly the need of island-grid work is ensured in active electric network state, defaulting it is original state, i.e. inner ring
Using fast current control, rectification side using constant DC voltage control and determines Reactive Power Control, inversion in outer loop control link
Side, which uses, determines active power controller and determines alternating voltage control, utilizes phase lock loop locks grid phase；
Step 2: on the basis of step 1, judging whether electricity generation system is in normal operating condition in island-grid, if hair
Electric system is normal operating condition, then island-grid will be continually maintained in the operation of active electric network state；If electricity generation system meets event
Hinder out of service, therefore island-grid can then generate active power shortage, it is existing mains frequency oscillation, dynamic load variation etc. occur
As making system play pendulum；
Step 3: on the basis of step 2, for make up electricity generation system it is out of service after active power shortage, switching
Exterior ring power Optimal Control Strategy is used in journey, and the reference value of active power is adjusted to island-grid active power peak value
90%, before power is not up to the 90% of island-grid active power peak value, outer loop control is first by Active Power Controller work
Make, later again using the controller for determining alternating voltage；
Step 4: on the basis of step 3, in order to be consistent the power grid phase angle of MMC converter station afterwards before the handover, because
, when island-grid switches to passive network by active electric network, coordinate transform rotational angle settings are the π of θ=2 f for this0+δ1, f0For power grid
Rated frequency 50Hz, δ1For the power grid phase angle of switching moment locking, retainer may be implemented phase angle and follow function；
Step 5: after step 4, switching moment, each electrical quantity fluctuation reached minimum, and system is gradually recovered stabilization, lonely
Island power grid smoothly switches to passive network state, i.e. inner ring retains fast current control, and rectification side uses in outer loop control link
Determine DC voltage and determine Reactive Power Control, inverter side is using alternating voltage control is determined, due to being in passive net when island-grid
When network, the locking phase information of AC system, therefore the controller of MMC rectification side and inverter side can not be obtained by phaselocked loop
The π of θ=2 f is directly given as with phase needed for modulation module0t。
Such as Fig. 2, a kind of structure chart of MMC topology in MMC-HVDC island-grid power supply control is provided, such as Fig. 2 (a) institute
Show, each of MMC is mutually made of upper and lower two bridge arms, and each bridge arm has n modular unit, and upper and lower two bridge arms pass through bridge arm string
Join reactor LsIt is connected, the tie point of two bridge arm current-limiting reactors constitutes the ac output end of the phase bridge arm.Bridge arm series electrical
Anti- device LsPlay the role of inhibiting alternate circulation and reduces fault current change rate.As shown in Fig. 2 (b), each submodule of MMC
MMC is formed by two IGBT, two sustained diodes 1 and D2 and sub- module capacitance and passes through the number of increase modular unit
Mesh improves the grade of output voltage, and the number of modular unit is more, and more grade of output voltage, and output waveform is closer
Sine wave.
Such as Fig. 3, a kind of MMC-HVDC system construction drawing powered to island-grid is provided, wherein sending end AC network regards
For Infinite bus system, receiving end island-grid is made of electricity generation system, quiet dynamic load.When electricity generation system operates normally, isolated island
Power grid is in active electric network state, and when electricity generation system is removed or chance failure is out of service, island-grid is become by active electric network
For passive network.
Such as Fig. 4, a kind of two close cycles vector controlled block diagram of MMC-HVDC when island-grid is in active electric network is provided,
The MMC two close cycles vector controlled is made of inner ring current control, open sea wharf, Design of PLL link.
Inner ring current control refers to idAnd iqThe i of open sea wharf output is tracked by PI adjustingdrefAnd iqref, finally
Export ucd *And ucq *Modulation module enables MMC output AC voltage waveform.Due to idAnd iqIt intercouples, so using feedforward
Decoupling control introduces compensating for coupling item ω Lid、ωLiqRealize the decoupling control to d axis and q axis.
Open sea wharf refers to makes actual active amount and idle amount track active amount and idle amount by regulation and control
Reference value.Wherein, active amount includes active power and DC voltage, and idle amount includes reactive power and alternating voltage.According to
The present invention needs, and due to DC transmission system it has to be ensured that the stabilization of DC voltage, and ensures the steady of inverter side alternating voltage
Fixed output, so the rectification side of MMC-HVDC need to use constant DC voltage control and determine when island-grid is in active electric network
Reactive Power Control, inverter side, which uses, to be determined active power controller and determines alternating voltage to control.
Design of PLL is formed by phase demodulation link, using low-pass filtering link, the voltage controlled oscillation link of PI structure.It is closed double
It in ring vector controlled, needs through park to transform to alternating voltage, electric current under dq coordinate system, when park transformation needs to know transformation
Electric network voltage phase, guarantee the control of voltage vector with this, so just phaselocked loop is needed to carry out locking phase at this time.This locking phase
Ring is due to the low-pass filtering link using PI structure, in addition to filter function may be implemented, moreover it is possible to carry out to the phase of power grid
No error following.
Such as Fig. 5, a kind of MMC-HVDC is provided when island-grid is in passive network, the two close cycles vector control of rectification side
Block diagram processed.Rectification side two close cycles vector controlled is made of inner ring current control and outer ring controller.Wherein, inner ring current control is adopted
With fast current control, input quantity is controlled by adjusting, makes state variable idAnd iqQuickly track its reference value iderfAnd iqref。
Outer ring controller includes constant DC voltage control and determines Reactive Power Control, according to DC voltage instruction and reactive power instruction meter
Calculate inner ring current control d, q shaft current reference value idrefAnd iqref。
Such as Fig. 6, a kind of MMC-HVDC is provided when island-grid is in passive network, the two close cycles vector control of inverter side
Block diagram processed.Inverter side two close cycles vector controlled is made of inner ring current control and outer ring controller.When island-grid is in passive
When network, MMC needs are connect with passive network, in order to realize that the reliable power supply to passive network, passive network need MMC to export
The alternating voltage of amplitude and frequency stabilization will determine alternating voltage control as outer loop control so retaining current inner loop control.Its
In, current inner loop control is identical as rectification side, and alternating voltage control major requirement control exchange side voltage is determined in outer loop control
Amplitude and frequency, using voltage vector oriented control strategy, by usd=us, uSq=0, change the control amount of power outer ring into exchange
The d axis and q axis component of voltage.
Locking phase due to that when island-grid is in passive network, can not obtain AC system by phaselocked loop is believed
Breath, therefore phase needed for the controller and modulation module of MMC rectification side and inverter side is directly given as the π of θ=2 f0T, wherein f0
For power grid rated frequency, guarantees the alternating current voltage frequency invariance of converter station output with this, provide high quality for passive network
Electric energy supply.
When island-grid is in active electric network, if electricity generation system is removed or chance failure is out of service, can determine whether at this time
Island-grid is transformed into passive network by active electric network, and becomes cutting for passive network by active electric network using this as island-grid
Change instruction.At this time due in island-grid electricity generation system it is out of service, system can generate active power shortage, active power shortage
Phenomenon can directly result in the oscillation of mains frequency, and frequency oscillation will lead to the load variations of dynamic load, and the concussion of load is then
It will lead to the concussion of alternating voltage, so that system be made to play pendulum.
Island-grid before the handover after difference be mainly reflected in following two points: 1. active electric network inverter sides are using fixed active
Power control, passive network inverter side, which uses, determines alternating voltage control strategy；2. by phaselocked loop come locking phase when active electric network,
It is not available phaselocked loop when passive network and obtains phase, so phase is direct given value.
Based on island-grid before the handover after active power difference, in handoff procedure be added exterior ring power optimization control
System, i.e., when island-grid is in handoff procedure, changed power is larger, for make up electricity generation system it is out of service after wattful power
Rate vacancy uses exterior ring power Optimal Control Strategy in handoff procedure, and the reference value of active power, which is adjusted to island-grid, to be had
The 90% of function power peak, before power is not up to the 90% of island-grid active power peak value, outer loop control is first by active
Power controller work, later again using the controller for determining alternating voltage.Using the above control strategy, system can be enhanced and cut
The stability at moment is changed, guarantees that each electrical quantity fluctuation of switching moment system is minimum, keeps island-grid steady in switching moment
Fixed operation.
Based on island-grid, rear phase angle setting is different before the handover, and phase angle model- following control is added in handoff procedure,
I.e. due to when island-grid is in passive network, phase needed for the controller and modulation module of MMC rectification side and inverter side
Directly it is given as the π of θ=2 f0T, in order to be consistent the power grid phase angle of MMC converter station afterwards before the handover, therefore in island-grid
When switching to passive network by active electric network, coordinate transform rotational angle settings are the π of θ=2 f0+δ1, f0For power grid rated frequency
50Hz, δ1For the power grid phase angle of switching moment locking, retainer may be implemented phase angle and follow function.
Such as Fig. 7, a kind of MMC-HVDC is provided in island-grid and is in the control plan in active/passive network switching process
Slightly block diagram.Switch s1、s2、s3It is the switching switch for realizing control, wherein the function of retainer is to realize that phase angle follows.Work as isolated island
When in active, switch s1、s2、s3It is in position 1；When island-grid is switched to passive states from active, open
Close s2、s3It is moved at the same time with retainer, is transferred to position 0, and switch s1It is still located at position 1, to make up the wattful power in handoff procedure
Rate vacancy, the active power value that handoff procedure need to be made to transmit reach the 90% of island-grid active power peak value, then will switch s1
It is adjusted to position 0, island-grid even running may be implemented in above method, smoothly switches to passive network.
Above-described embodiment only preferable embodiment to illustrate the invention, but embodiments of the present invention are not by the reality
Example limitation is applied, other are any without departing from made changes, modifications, substitutions, combinations, simplifications under spirit of the invention and principle,
It should be equivalent substitute mode, be included in protection scope of the present invention.
Claims (7)
1. a kind of MMC-HVDC island-grid active/passive method for handover control, it is based on modularization multi-level converter
What the flexible HVDC transmission system of (Modular Multilevel Converter, MMC) was realized, i.e. MMC-HVDC, this system
Main includes the direct current transportation circuit of two sides AC network, both ends inverter and centre, one end inverter in the inverter of both ends
Work works in rectification mode, other end inverter in inverter mode；The modularization multi-level converter is passed through by upper and lower bridge arm
It crosses bridge arm reactor to be connected in series, wherein upper and lower bridge arm is connected in series by the identical half-bridge submodule of quantity, each submodule
By two IGBT, two sustained diodes1And D2An and sub- module capacitance composition；The MMC- to power to island-grid
HVDC system, sending end AC network are considered as Infinite bus system, and receiving end island-grid is made of electricity generation system, quiet dynamic load；
It is characterized in that, which comprises when MMC-HVDC system switches to passive network by active electric network to island-grid
Control method, refer to and combine exterior ring power optimal control and phase angle model- following control with inner ring current control, make island-grid
Reach minimum to passive network switching moment each electrical undulate quantity active, realizes and smoothly stablize switching, this method includes following
Step:
Step 1: firstly the need of island-grid work is ensured in active electric network state, defaulting it is original state, i.e. inner ring uses
Fast current control, rectification side using constant DC voltage control and determines Reactive Power Control in outer loop control link, and inverter side is adopted
It is controlled with active power controller is determined with alternating voltage is determined, using phase lock loop locks grid phase；
Step 2: on the basis of step 1, judging whether island-grid electricity generation system is in normal operating condition, if electricity generation system
For normal operating condition, run then island-grid will be continually maintained in active electric network state；If electricity generation system is met failure and is exited
Therefore operation, island-grid can then generate active power shortage, phenomena such as mains frequency oscillation, dynamic load variation occur, make
System plays pendulum；
Step 3: on the basis of step 2, for make up electricity generation system it is out of service after active power shortage, in handoff procedure
Using exterior ring power Optimal Control Strategy, the reference value of active power is adjusted to the 90% of island-grid active power peak value,
Power is not up to before the 90% of island-grid active power peak value, and outer loop control is first worked by Active Power Controller, later
Again using the controller for determining alternating voltage；
Step 4: on the basis of step 3, in order to be consistent the power grid phase angle of MMC converter station afterwards before the handover, therefore
It is the π of θ=2 f by coordinate transform rotational angle settings when island-grid switches to passive network by active electric network0+δ1, f0For power grid volume
Determine frequency 50Hz, δ1For the power grid phase angle of switching moment locking, realize that phase angle follows function with retainer；
Step 5: after step 4, each electrical quantity fluctuation reaches minimum in switching moment isolated island, and system is gradually recovered stabilization,
Island-grid smoothly switches to passive network state, i.e. inner ring retains fast current control, and rectification side is adopted in outer loop control link
With determining DC voltage and determine Reactive Power Control, inverter side is using alternating voltage control determine, due to when island-grid is in passive
When network, the locking phase information of AC system, therefore the control of MMC rectification side and inverter side can not be obtained by phaselocked loop
Phase needed for device and modulation module is directly given as the π of θ=2 f0t。
2. a kind of MMC-HVDC island-grid active/passive method for handover control according to claim 1, feature exist
In: in the step 1, when island-grid is in active electric network, MMC-HVDC System control structures are mainly by outer loop control ring
Section, inner ring current control link, Design of PLL link composition, due to DC transmission system it has to be ensured that DC voltage it is steady
Determine and ensure that stablizing for inverter side alternating voltage exports, therefore, rectification side uses constant DC voltage control in outer loop control link
With determine Reactive Power Control, inverter side is controlled using determine active power controller and determine alternating voltage.
3. a kind of MMC-HVDC island-grid active/passive method for handover control according to claim 1, feature exist
In: in the step 2, when island-grid is in active electric network, if electricity generation system is removed in isolated island or chance failure exits fortune
Row, can determine whether that island-grid is transformed into passive network by active electric network, and become by active electric network using this as island-grid at this time
For the switching command of passive network.
4. a kind of MMC-HVDC island-grid active/passive method for handover control described in claim 1, it is characterised in that: institute
Stating system in step 2 wild effect occur is because being since electricity generation system is out of service in island-grid in switching moment
System can generate active power shortage, and active power shortage phenomenon can directly result in the oscillation of mains frequency, and frequency oscillation will lead to
The concussion of the load variations of dynamic load, load then will lead to the concussion of alternating voltage, so that system be made to be in unstable shape
State.
5. a kind of MMC-HVDC island-grid active/passive method for handover control according to claim 1, feature exist
In: the exterior ring power optimal control in the step 3 refers to, when island-grid is in handoff procedure, to make up power generation system
Unite it is out of service after active power shortage, in handoff procedure use exterior ring power Optimal Control Strategy, by active power
Reference value is adjusted to the 90% of island-grid active power peak value, power be not up to island-grid active power peak value 90% it
Before, work is first kept by Active Power Controller in terms of outer loop control, constant power reaches island-grid active power peak value
Island-grid is set faster to reach stable state using the controller for determining alternating voltage again after 90%.
6. a kind of MMC-HVDC island-grid active/passive method for handover control according to claim 1, feature exist
Refer in: the phase angle model- following control in the step 4, due to when island-grid is in passive network, MMC rectification side and inversion
Phase needed for the controller and modulation module of side is directly given as the π of θ=2 f0T, in order to make the power grid phase angle of MMC converter station exist
Switching front and back is consistent, and phase angle model- following control is added in switching control strategy, and retainer can realize phase angle model- following control, because
Coordinate transform rotational angle settings are the π of θ=2 f when island-grid switches to passive network by active electric network by this0+δ1, f0For electricity
Net rated frequency 50Hz, δ1For the power grid phase angle of switching moment locking.
7. a kind of MMC-HVDC island-grid active/passive method for handover control according to claim 1, feature exist
In: in the step 5, when island-grid is in passive network, MMC-HVDC System control structures are mainly by outer loop control ring
Section, inner ring current control link composition, since MMC needs to connect with passive network, in order to realize the reliable confession to passive network
Electricity, passive network need the alternating voltage of MMC output amplitude and frequency stabilization, so rectification side is using fixed in outer loop control link
DC voltage and determine Reactive Power Control, inverter side is controlled using alternating voltage determine.
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110739714A (en) * | 2019-10-23 | 2020-01-31 | 南方电网科学研究院有限责任公司 | Online smooth switching method for islanding and networking modes of flexible direct converter valves |
| CN110854866A (en) * | 2019-11-26 | 2020-02-28 | 华北电力科学研究院有限责任公司 | Reactive voltage control method and device of modular multilevel converter |
| CN111864784A (en) * | 2020-07-29 | 2020-10-30 | 浙江华云清洁能源有限公司 | MMC-HVDC island power supply fault ride-through coordination control method and device |
| CN114583694A (en) * | 2022-03-09 | 2022-06-03 | 四川大学 | Black start and coordination recovery method for receiving-end power grid based on mixed direct current |
| CN114640141A (en) * | 2022-05-17 | 2022-06-17 | 浙江大学 | Network-building type fan control method for offshore wind power diode rectification unit sending-out system |
| US11641109B2 (en) | 2022-05-17 | 2023-05-02 | Zhejiang University | Grid-forming wind turbine control method for diode rectifier unit-based offshore wind power transmission system |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103647286A (en) * | 2013-11-15 | 2014-03-19 | 许继集团有限公司 | Modularization multi-level converter island switching control method |
| CN103795080A (en) * | 2014-01-23 | 2014-05-14 | 湖南大学 | Grid connection method of MMC-type light direct-current power transmission system |
| CN105870967A (en) * | 2016-04-29 | 2016-08-17 | 许继电气股份有限公司 | Islanding-to-networking control method and system for flexible direct-current transmission system |
| WO2018076904A1 (en) * | 2016-10-31 | 2018-05-03 | 南京南瑞继保电气有限公司 | Fault current limiting control and protection coordination method for converter operating in isolated state in flexible direct current power transmission system |
-
2019
- 2019-05-10 CN CN201910388781.9A patent/CN110034586A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103647286A (en) * | 2013-11-15 | 2014-03-19 | 许继集团有限公司 | Modularization multi-level converter island switching control method |
| WO2015070493A1 (en) * | 2013-11-15 | 2015-05-21 | 许继电气股份有限公司 | Island switching control method for modular multi-level converter |
| CN103795080A (en) * | 2014-01-23 | 2014-05-14 | 湖南大学 | Grid connection method of MMC-type light direct-current power transmission system |
| CN105870967A (en) * | 2016-04-29 | 2016-08-17 | 许继电气股份有限公司 | Islanding-to-networking control method and system for flexible direct-current transmission system |
| WO2018076904A1 (en) * | 2016-10-31 | 2018-05-03 | 南京南瑞继保电气有限公司 | Fault current limiting control and protection coordination method for converter operating in isolated state in flexible direct current power transmission system |
Non-Patent Citations (8)
| Title |
|---|
| 中国科学技术协会: "《2014-2015动力与电气工程学科发展报告》", 28 February 2016 * |
| 刘昇等: "MMC-HVDC联网及孤岛运行状态转换策略", 《中国电机工程学报》 * |
| 吴蒙: "含大规模风电接入的柔性直流电网启动控制策略研究", 《中国优秀硕士学位论文全文数据库 工程科技Ⅱ辑》 * |
| 唐庚等: "基于模块化多电平换流器的多端柔性直流输电控制系统设计", 《高电压技术》 * |
| 李健等: "双端有源MMC-HVDC系统的控制策略研究", 《电力大数据》 * |
| 林畅等: "厦门柔性直流输电系统孤岛运行控制仿真研究", 《智能电网》 * |
| 陈大林: "向孤岛电网供电的柔性直流逆变站控制策略研究", 《中国优秀硕士学位论文全文数据库工程科技Ⅱ辑》 * |
| 马文忠等: "向海岛电网供电的MMC-HVDC 有源/无源切换控制策略", 《电力系统保护与控制》 * |
Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110739714A (en) * | 2019-10-23 | 2020-01-31 | 南方电网科学研究院有限责任公司 | Online smooth switching method for islanding and networking modes of flexible direct converter valves |
| CN110854866A (en) * | 2019-11-26 | 2020-02-28 | 华北电力科学研究院有限责任公司 | Reactive voltage control method and device of modular multilevel converter |
| CN110854866B (en) * | 2019-11-26 | 2021-12-17 | 华北电力科学研究院有限责任公司 | Reactive voltage control method and device of modular multilevel converter |
| CN111864784A (en) * | 2020-07-29 | 2020-10-30 | 浙江华云清洁能源有限公司 | MMC-HVDC island power supply fault ride-through coordination control method and device |
| CN114583694A (en) * | 2022-03-09 | 2022-06-03 | 四川大学 | Black start and coordination recovery method for receiving-end power grid based on mixed direct current |
| CN114583694B (en) * | 2022-03-09 | 2023-04-21 | 四川大学 | Hybrid direct current-based black start and coordination recovery method for receiving end power grid |
| CN114640141A (en) * | 2022-05-17 | 2022-06-17 | 浙江大学 | Network-building type fan control method for offshore wind power diode rectification unit sending-out system |
| CN114640141B (en) * | 2022-05-17 | 2022-08-05 | 浙江大学 | Network-building type fan control method for offshore wind power diode rectification unit sending-out system |
| US11641109B2 (en) | 2022-05-17 | 2023-05-02 | Zhejiang University | Grid-forming wind turbine control method for diode rectifier unit-based offshore wind power transmission system |
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