CN105119305B - A kind of MMC type THE UPFC charge control method - Google Patents
A kind of MMC type THE UPFC charge control method Download PDFInfo
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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
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- 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
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Abstract
The invention discloses a kind of MMC type THE UPFC charge control method, when THE UPFC parallel connection side and series side MMC complete alternating current-direct current connection, meet after preparing charge condition, transverter is initiated by side MMC in parallel to charge, charge control method includes the charge control method and the charge control method of series side MMC of parallel connection side MMC.The present invention is on the basis of THE UPFC charging process is analyzed, charging is not controlled by side in parallel and series side MMC and the optimization of active charge coordinates, the stable charge initiation to THE UPFC is realized, corresponding converter Control implementation method is devised；The present invention realizes that simply reliability is high, improves the security of THE UPFC startup optimization simultaneously.
Description
Technical field
The present invention relates to a kind of MMC type THE UPFC charge control method, belong to power system automatic field.
Background technology
THE UPFC (Unified Power Flow Controller, UPFC) is by the control to transverter
Flexible Control can be realized to multiple electric parameters, realize active and reactive power the accurate regulation of circuit, System Reactive Power voltage
Control control, is favorably improved conveying capacity and safety and stability level, is the highest level of current flexible AC transmission technology.Closely
Nian Lai, as transverter technology develops into many level topologies, wherein modular multilevel from topologys such as two level, three level
(Modular Multilevel Converter, MMC) makes Typical Representative therein, and this also makes Power Electronic Technique in high voltage
Bulk power transmission field is able to popularization and application, and MMC structures are as shown in Figure 1.
The electric capacity of MMC is scattered in each submodule (sub module, SM), compared to two level, three-level topology, its electricity
The dynamic process of condenser charge is much more complex.In general, the preliminary filling of MMC electric capacity can electrically be divided into two kinds of separate excitation and self-excitation.
Separate excitation is to provide charge power by accessory power supply, and self-excitation refers to be charged to capacitor from the AC system that is connected with transverter.At present
It is most of by the way of charging of encouraging oneself in engineering.In view of distributed feature on MMC capacitor arrangements, charged in self-excitation
During, it is necessary to keep the relative equilibrium of each SM capacitive energies, while for limitation charging current, it is necessary to control to inject the work(of MMC
Rate size.
But, MMC-UPFC is different with the method for operation due to the design feature of its own, and its start-up course also has difference
In the new feature that single MMC structures transverter and MMC-HVDC (high voltage direct current) start：(1)
The pre-charge process of MMC-UPFC series side transverters needs plus outer control, due to not possessing required for self-excitation type starts
The precharge of AC power series side transverter can not use self-excitation type Starting mode.Electrical distance between connection in series-parallel dc bus
It is too short, easily cause very big overcurrent.If series side transverter enters line precharge, side in parallel to its submodule in some way
Transverter carries out self-excitation type precharge by AC power, when two parts of charge independence connect together, due between the two
Electrical distance is shorter, can cause very big loop overcurrent, damage equipment.(2) series transformer is with minimum pressure drop input coefficient,
It is the particular/special requirement of MMC-UPFC, after MMC pre-charge process terminates, series transformer should be made by rational control method
Pressure drop is minimum.
The premise normally run as MMC type UPFC systems and basis, the startup of transverter are charged and are mainly submodule electricity
The foundation of container rated voltage, this is the key link for setting up rated direct voltage.If link control is improper will produce seriously
Overvoltage and excessively stream, even result in system oscillation, influence AC system is normally run, and jeopardizes the equipment such as converter valve and person peace
Entirely.Therefore, studied in the control method of charge initiation process for MMC type UPFC, proposed a kind of stable charging method,
It is significant for UPFC and the safe and stable operation for accessing power network.
The content of the invention
In order to solve the above-mentioned technical problem, the invention provides a kind of MMC type THE UPFC charge control method.
In order to achieve the above object, the technical solution adopted in the present invention is：
A kind of MMC type THE UPFC charge control method, as THE UPFC parallel connection side and series side MMC
Alternating current-direct current connection is completed, is met after preparing charge condition, transverter initiated by side MMC in parallel and is charged, charge control method includes
The charge control method of side MMC in parallel and the charge control method of series side MMC；
The charge control method of the side MMC in parallel is concretely comprised the following steps,
A1) parallel connection side MMC initiates THE UPFC charging instruction, and side MMC in parallel enters charged state；
A2) initialization parallel connection side unlocking signal Deblk_sh=0 and active charge released state mark chg_sh=1；
A3) parallel connection side MMC is not controlled charging；
Input charging resistor, is charged by merging connection side ac power switch to THE UPFC converter valve；
A4) as alternating current Ish＜ Ith, and MMC submodule capacitor voltage average values U in side in parallelsh_sm_avg＞ kcdUcN, then
Go to step A5), otherwise continue not controlling charging；
Wherein, kcdIt is voltage threshold coefficient, IthBe side electric current in parallel without stream threshold value, UcNIt is submodule capacitor voltage volume
Definite value；
A5 charging resistor) is exited, side MMC in parallel possesses preparation service condition；
A6) parallel connection side MMC unblocks, unlocking signal Deblk_sh=1 carries out active charge to side MMC in parallel；
A7) charging released state, i.e. chg_sh=1 if parallel connection side MMC has the initiative, then go to step A8, otherwise goes to
Step A11；
A8) MMC active charge controls in side in parallel are using constant DC voltage control and determine Reactive Power Control, using direct current
Voltage-controlled zygote module capacitance voltage balance control processed proceeds to charge, wherein, parallel line reactive power reference qref Qsh_ref
=0, DC voltage refers to Ush_DC_ref=min { Udc+ΔUdcref·(t-t0),UdcN}；
Wherein, Δ UdcrefIt is DC voltage climbing speed, UdcIt is the DC voltage that side in parallel unblock is charged when starting, t0With
T represents active charge start time and current time, U respectivelydcNIt is rated direct voltage；
A9) as side MMC submodule capacitor voltage minimum values U in parallelsh_sm_min＞ kcd_HUcN, A10 is gone to, otherwise go to A7；
Wherein, kcd_hIt is submodule capacitor voltage threshold coefficient high；
A10) parallel connection side MMC charges and terminates, active charge released state mark chg_sh=0, goes to A6；
A11) parallel connection side MMC is transferred to normal control mode, using constant DC voltage control and determines REACTIVE POWER/VOLTAGE CONTROL, its
In, parallel line reactive power reference qref Qsh_ref=0, DC voltage refers to Ush_DC_ref=Udc；
A12 after) side in parallel and series side MMC normal releases run, THE UPFC operation, and keep Line Flow
It is the trend before unblock, THE UPFC charge initiation is completed, waits controllers to assign new control instruction；
The charge control method of series side MMC is concretely comprised the following steps,
B1) parallel connection side MMC initiates THE UPFC charging instruction, and series side MMC enters charged state；
B2) initialization series side unlocking signal Deblk_se=0 and active charge released state mark chg_se=1；
B3) series side MMC is not controlled charging；
Series side MMC is charged by side MMC in parallel by DC side；
B4) as series side MMC submodule capacitor voltage minimum values Use_sm_min＞ UL_th, then go to step B5), otherwise after
It is continuous not control charging, wherein, UL_thThe minimum voltage that energy is taken by meeting submodule is determined；
B5) series side MMC unblocks, unlocking signal Deblk_se=1 carries out active charge to series connection MMC；
B6) charging released state, i.e. chg_se=1 if series side MMC has the initiative, then go to step B7, otherwise goes to
Step B10；
B7) series side MMC active charges control uses and determines active power controller and determine alternating voltage control, wherein, series connection
Circuit active power reference value PL_ref=PL, alternating voltage reference value Use_AC_ref=0；
Wherein, PLIt is actual series circuit active power；
B8) as series side MMC submodule capacitor voltage minimum values Use_sm_min＞ 0.95UcN, B9 is gone to, otherwise go to B6；
B9) series side MMC charges and terminates, active charge released state mark chg_se=0, unlocking signal Deblk_se=
0, go to B5；
B10) series side MMC is transferred to normal control mode, using the idle control of alignment road real power control and alignment road, its
In, series circuit active power reference value PL_ref=PL, series circuit reactive power reference qref QL_ref=QL, with to alternating current circuit
Power influence is minimum；
Wherein, QLIt is actual series circuit reactive power；
B11 after) side in parallel and series side MMC normal releases run, THE UPFC operation, and keep Line Flow
It is the trend before unblock, THE UPFC charge initiation is completed, waits controllers to assign new control instruction.
kcd=0.75, kcd_h=0.95.
The beneficial effect that the present invention is reached：The present invention is led on the basis of THE UPFC charging process is analyzed
Cross side in parallel and series side MMC does not control charging and the optimization of active charge coordinates, realize to the stable of THE UPFC
Charge initiation, devises corresponding converter Control implementation method；The present invention realizes that simply reliability is high, improves system simultaneously
The security of one flow controller startup optimization.
Brief description of the drawings
Fig. 1 is the schematic diagram of MMC topological structures.
Fig. 2 is the structural representation of UPFC.
Fig. 3 is that UPFC starts charging scheme flow.
Fig. 4 is that MMC-UPFC does not control charging equivalent circuit.
Fig. 5 is UPFC charge initiation control method schematic diagrams.
Specific embodiment
The invention will be further described below in conjunction with the accompanying drawings.Following examples are only used for clearly illustrating the present invention
Technical scheme, and can not be limited the scope of the invention with this.
As shown in Fig. 2 MMC type UPFC charge initiations include that parallel connection side MMC charges and series side MMC charges.Side MMC in parallel
Charging can be divided into two processes.First process is to merge connection AC system switch, and MMC blockings are in uncontrollable rectifier
Do not controlled charging under effect to sub- module capacitance, connection become valve side line voltage peak value will in single bridge arm all submodules
Mean allocation on electric capacity, and the end value of DC voltage will be equal to the peak value of ac line voltage.Second process is transverter
Unblock, is further charged to transverter, submodule voltage and DC voltage is finally kept near rated voltage.
Because capacitance voltage can not be mutated, thus from capacitance voltage be zero pair of its moment DC loop for charging equivalent to short-circuit condition,
And IGBT device is very sensitive to overcurrent, excessive electric current can damage device, therefore general concatenation in charge circuit is charged
Resistance, limits charging process, the overcurrent of start time of especially charging.Charging electricity should be in time exited after the completion of charging process
Resistance, is that the conveying power of next stage is ready.
And for UPFC series side MMC, charged, it is necessary to be carried out by DC side because it cannot carry out AC self-excitation
Charge, i.e., series side MMC is charged by side MMC in parallel.Charging to UPFC Cascade Systems side MMC is also classified into two mistakes
Journey.First process is that series side transverter is not controlled by DC side and is charged as simultaneously while side transverter in parallel charges
Submodule electric capacity charges, but the voltage end value is only the half of transverter submodule in side in parallel；Second process is by master
Dynamic charging is further charged to the submodule of transverter of connecting.
According to above-mentioned analysis, the charging sequential of UPFC and the fitting method of connection in series-parallel side can be devised, realization is changed UPFC
Flow the stable charge initiation of device.
Concrete scheme is as shown in Figure 3：
First stage, UPFC series sides and parallel connection side MMC are not controlled charging by side in parallel.
Side in parallel and series side MMC complete alternating current-direct current connection, put into charging resistor, by merging connection side ac power switch
UPFC converter valves are charged, series side MMC is charged by side MMC in parallel by DC side, its submodule capacitor voltage is side in parallel
The half of submodule capacitor voltage；If the process is continued for, the peak value of final ac line voltage is in the single bridge arm in side in parallel
In mean allocation on all submodule electric capacity, the peak value by alternating voltage is equal to of DC voltage, DC voltage is in series side MMC
Mean allocation on all submodule electric capacity of each facies unit, series side MMC submodule capacitor voltages are the one of side MMC in parallel
Half, equivalent charge model is as shown in Figure 4.
Second stage, series side MMC carries out active charge.
Series side MMC active charges are to charge unblock by converter valve with realizing.In order to prevent in DC voltage higher
After lower unblock so that side MMC in parallel and series side MMC DC voltages difference are excessive and produce larger dash current, cause son
Module capacitance voltage pulsation is larger, in the first stage, DC voltage set up initial stage, when meet submodule take can minimum voltage
It is required that after, unlock series side MMC.
In order to ensure the stability that series side MMC submodules charge, series side MMC is used and is determined active power control during charging
Alternating voltage control is made and determines, wherein, series circuit active-power PL_refEqual to actual series circuit active-power PL, exchange
Voltage reference value Use_AC_ref=0, to ensure that charging stage series side MMC influences minimum after unlocking on alternating current circuit power.
Series side MMC active charge stages, series side MMC unblock moment DC voltages decline, and then gradually rise, due to
It is the half of facies unit submodule quantity to put into submodule quantity after series side MMC unblocks, i.e. DC voltage is total to by N number of submodule
It is same to undertake.In the presence of MMC submodule capacitor voltage Balance routes, finally, series side MMC submodule capacitor voltages tend to phase
Deng, and it is equal with MMC submodule capacitor voltages in side in parallel.
Phase III, side MMC in parallel carries out active charge.
In charging process, as submodule capacitor voltage rises, charging current is gradually reduced, when top-cross current charge in parallel electricity
After stream is reduced to zero, side in parallel is not controlled charging and is terminated.Not controlling charging due to side in parallel can not fill connection in series-parallel submodule capacitor voltage
To rated value, it is impossible to the need for meeting MMC-UPFC normal works, so needing using control method to further to submodule
Capacitance voltage is charged, until being charged to nominal.When side MMC in parallel does not control (charging current is zero) after charging terminates,
Charging resistor is exited, and is unlocked side MMC in parallel using constant DC voltage control and is determined Reactive Power Control, it is voltage-controlled using direct current
Zygote module capacitance voltage balance control processed continues to charge, and enables each intermodule capacitive energy to keep relative equilibrium simultaneously steady
Rise, until MMC submodule capacitor voltages reach nominal.Wherein, parallel line reactive power reference qref Qsh_ref=0, directly
Stream Voltage Reference Ush_DC_refIt is rated direct voltage UdcN, i.e. Ush_DC_ref=UdcN, to reduce the impact to system, determine direct current
Voltage-controlled system uses the control mode with slope, i.e. direct voltage reference value to determine as the following formula,
Ush_DC_ref=min { Udc+ΔUdcref·(t-t0),UdcN}
Wherein, Δ UdcrefIt is DC voltage climbing speed, UdcIt is the DC voltage that side in parallel unblock is charged when starting, t0With
T represents active charge start time and current time respectively.
As shown in figure 5, as follows according to the method that such scheme is formulated：
When THE UPFC parallel connection side and series side MMC complete alternating current-direct current connection, meet after preparing charge condition, by
Side MMC in parallel initiates transverter and charges, charge control method and series side MMC of the charge control method including parallel connection side MMC
Charge control method.
The charge control method of the side MMC in parallel is concretely comprised the following steps：
A1) parallel connection side MMC initiates THE UPFC charging instruction, and side MMC in parallel enters charged state；
A2) initialization parallel connection side unlocking signal Deblk_sh=0 and active charge released state mark chg_sh=1；
A3) parallel connection side MMC is not controlled charging；
Input charging resistor, is charged by merging connection side ac power switch to THE UPFC converter valve；
A4) as alternating current Ish＜ Ith, and MMC submodule capacitor voltage average values U in side in parallelsh_sm_avg＞ kcdUcN, then
Go to step A5), otherwise continue not controlling charging；Wherein, kcdIt is voltage threshold coefficient (generally less than 0.866) that can use 0.75,
IthBe side electric current in parallel without stream threshold value, UcNIt is submodule capacitor voltage rated value；
A5 charging resistor) is exited, side MMC in parallel possesses preparation service condition；
A6) parallel connection side MMC unblocks, unlocking signal Deblk_sh=1 carries out active charge to side MMC in parallel；
A7) charging released state, i.e. chg_sh=1 if parallel connection side MMC has the initiative, then go to step A8, otherwise goes to
Step A11；
A8) MMC active charge controls in side in parallel are using constant DC voltage control and determine Reactive Power Control, using direct current
Voltage-controlled zygote module capacitance voltage balance control processed proceeds to charge, wherein, parallel line reactive power reference qref Qsh_ref
=0, DC voltage refers to Ush_DC_ref=min { Udc+ΔUdcref·(t-t0),UdcN}；
Wherein, Δ UdcrefIt is DC voltage climbing speed, UdcIt is the DC voltage that side in parallel unblock is charged when starting, t0With
T represents active charge start time and current time respectively.
A9) as side MMC submodule capacitor voltage minimum values U in parallelsh_sm_min＞ kcd_HUcN, A10 is gone to, otherwise go to A7；
Wherein kcd_HIt is submodule capacitor voltage threshold coefficient high (being less than 1), can use 0.95；
A10) parallel connection side MMC charges and terminates, active charge released state mark chg_sh=0, goes to A6；
A11) parallel connection side MMC is transferred to normal control mode, using constant DC voltage control and determines REACTIVE POWER/VOLTAGE CONTROL, its
In, parallel line reactive power reference qref Qsh_ref=0, DC voltage refers to Ush_DC_ref=Udc；
A12 after) side in parallel and series side MMC normal releases run, THE UPFC operation, and keep Line Flow
It is the trend before unblock, THE UPFC charge initiation is completed, waits controllers to assign new control instruction；
The charge control method of series side MMC is concretely comprised the following steps：
B1) parallel connection side MMC initiates THE UPFC charging instruction, and series side MMC enters charged state；
B2) initialization series side unlocking signal Deblk_se=0 and active charge released state mark chg_se=1；
B3) series side MMC is not controlled charging；
Series side MMC is charged by side MMC in parallel by DC side；
B4) as series side MMC submodule capacitor voltage minimum values Use_sm_min＞ UL_th, then go to step B5), otherwise after
It is continuous not control charging, wherein, UL_thThe minimum voltage that energy is taken by meeting submodule is determined；
B5) series side MMC unblocks, unlocking signal Deblk_se=1 carries out active charge to series connection MMC；
B6) charging released state, i.e. chg_se=1 if series side MMC has the initiative, then go to step B7, otherwise goes to
Step B10；
B7) series side MMC active charges control uses and determines active power controller and determine alternating voltage control, wherein, series connection
Circuit active power reference value PL_ref=PL, alternating voltage reference value Use_AC_ref=0；
Wherein, PLIt is actual series circuit active power；
B8) as series side MMC submodule capacitor voltage minimum values Use_sm_min＞ kcd_HUcN, B9 is gone to, otherwise go to B6；
B9) series side MMC charges and terminates, active charge released state mark chg_se=0, unlocking signal Deblk_se=
0, go to B5；
B10) series side MMC is transferred to normal control mode, using the idle control of alignment road real power control and alignment road, its
In, series circuit active power reference value PL_ref=PL, series circuit reactive power reference qref QL_ref=QL, with to alternating current circuit
Power influence is minimum；
Wherein, QLIt is actual series circuit reactive power；
B11 after) side in parallel and series side MMC normal releases run, THE UPFC operation, and keep Line Flow
It is the trend before unblock, THE UPFC charge initiation is completed, waits controllers to assign new control instruction.
In sum, it is of the invention on the basis of THE UPFC charging process is analyzed, by side in parallel and series connection
Side MMC does not control charging and the optimization of active charge coordinates, and realizes the stable charge initiation to THE UPFC, devises
Corresponding converter Control implementation method；The present invention realizes that simply reliability is high simultaneously, improves THE UPFC startup
The security of operation.
The above is only the preferred embodiment of the present invention, it is noted that for the ordinary skill people of the art
For member, on the premise of the technology of the present invention principle is not departed from, some improvement and deformation can also be made, these improve and deform
Also should be regarded as protection scope of the present invention.
Claims (2)
1. a kind of MMC type THE UPFC charge control method, it is characterised in that：When THE UPFC parallel connection side and
Series side MMC completes alternating current-direct current connection, meets after preparing charge condition, initiates transverter by side MMC in parallel and charges, charge control
Method includes the charge control method and the charge control method of series side MMC of parallel connection side MMC；
The charge control method of the side MMC in parallel is concretely comprised the following steps,
A1) parallel connection side MMC initiates THE UPFC charging instruction, and side MMC in parallel enters charged state；
A2) initialization parallel connection side unlocking signal Deblk_sh=0 and active charge released state mark chg_sh=1；
A3) parallel connection side MMC is not controlled charging；
Input charging resistor, is charged by merging connection side ac power switch to THE UPFC converter valve；
A4) as alternating current Ish＜ Ith, and MMC submodule capacitor voltage average values U in side in parallelsh_sm_avg＞ kcdUcN, then go to
Step A5), otherwise continue not controlling charging；
Wherein, kcdIt is voltage threshold coefficient, IthBe side electric current in parallel without stream threshold value, UcNIt is submodule capacitor voltage rated value；
A5 charging resistor) is exited, side MMC in parallel possesses preparation service condition；
A6) parallel connection side MMC unblocks, unlocking signal Deblk_sh=1 carries out active charge to side MMC in parallel；
A7) charging released state, i.e. chg_sh=1 if parallel connection side MMC has the initiative, then go to step A8, otherwise goes to step
A11；
A8) MMC active charge controls in side in parallel are using constant DC voltage control and determine Reactive Power Control, voltage-controlled using direct current
Zygote module capacitance voltage balance control processed proceeds to charge, wherein, parallel line reactive power reference qref Qsh_ref=0,
DC voltage refers to Ush_DC_ref=min { Udc+ΔUdcref·(t-t0),UdcN}；
Wherein, Δ UdcrefIt is DC voltage climbing speed, UdcIt is the DC voltage that side in parallel unblock is charged when starting, t0With t points
Biao Shi not active charge start time and current time, UdcNIt is rated direct voltage；
A9) as side MMC submodule capacitor voltage minimum values U in parallelsh_sm_min＞ kcd_hUcN, A10 is gone to, otherwise go to A7；
Wherein, kcd_hIt is submodule capacitor voltage threshold coefficient high；
A10) parallel connection side MMC charges and terminates, active charge released state mark chg_sh=0, goes to A6；
A11) parallel connection side MMC is transferred to normal control mode, using constant DC voltage control and determines REACTIVE POWER/VOLTAGE CONTROL, wherein, and
On line road reactive power reference qref Qsh_ref=0, DC voltage refers to Ush_DC_ref=Udc；
A12 after) side in parallel and series side MMC normal releases run, THE UPFC operation, and it is solution to keep Line Flow
Trend before lock, THE UPFC charge initiation is completed, and waits controllers to assign new control instruction；
The charge control method of series side MMC is concretely comprised the following steps,
B1) parallel connection side MMC initiates THE UPFC charging instruction, and series side MMC enters charged state；
B2) initialization series side unlocking signal Deblk_se=0 and active charge released state mark chg_se=1；
B3) series side MMC is not controlled charging；
Series side MMC is charged by side MMC in parallel by DC side；
B4) as series side MMC submodule capacitor voltage minimum values Use_sm_min＞ UL_th, then step B5 is gone to), otherwise continue not control
Charge, wherein, UL_thThe minimum voltage that energy is taken by meeting submodule is determined；
B5) series side MMC unblocks, unlocking signal Deblk_se=1 carries out active charge to series connection MMC；
B6) charging released state, i.e. chg_se=1 if series side MMC has the initiative, then go to step B7, otherwise goes to step
B10；
B7) series side MMC active charges control uses and determines active power controller and determine alternating voltage control, wherein, series circuit
Active power reference value PL_ref=PL, alternating voltage reference value Use_AC_ref=0；
Wherein, PLIt is actual series circuit active power；
B8) as series side MMC submodule capacitor voltage minimum values Use_sm_min＞ kcd_hUcN, B9 is gone to, otherwise go to B6；
B9) series side MMC charges and terminates, active charge released state mark chg_se=0, unlocking signal Deblk_se=0, turns
To B5；
B10) series side MMC is transferred to normal control mode, using the idle control of alignment road real power control and alignment road, wherein, string
On line road active power reference value PL_ref=PL, series circuit reactive power reference qref QL_ref=QL, with to alternating current circuit power
Influence is minimum；
Wherein, QLIt is actual series circuit reactive power；
B11 after) side in parallel and series side MMC normal releases run, THE UPFC operation, and it is solution to keep Line Flow
Trend before lock, THE UPFC charge initiation is completed, and waits controllers to assign new control instruction.
2. a kind of MMC type THE UPFC charge control method according to claim 1, it is characterised in that：kcd=
0.75, kcd_h=0.95.
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| CN201510613807.7A CN105119305B (en) | 2015-09-23 | 2015-09-23 | A kind of MMC type THE UPFC charge control method |
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| CN105827106B (en) * | 2016-03-11 | 2018-08-10 | 广东明阳龙源电力电子有限公司 | Zero impacting start combination methods of MMC in a kind of flexible direct current power transmission system |
| CN106911133B (en) * | 2017-04-27 | 2019-06-28 | 武汉理工大学 | A kind of Distributed Power Flow controller topological structure and control method based on MMC |
| CN107994565B (en) * | 2017-10-30 | 2021-11-02 | 中国电力科学研究院有限公司 | Simulation method and system of unified power flow controller |
| CN108599227B (en) * | 2018-06-11 | 2020-04-14 | 中国电力工程顾问集团中南电力设计院有限公司 | MMC direct-current voltage balance control method for forming direct-current converter station based on MMC cascade connection |
| CN110808604B (en) * | 2019-11-18 | 2020-09-25 | 广东电网有限责任公司 | Three-port energy control device based on MMC structure |
| CN112467759B (en) * | 2021-01-28 | 2021-05-28 | 国网浙江省电力有限公司电力科学研究院 | Control method and system of distributed power flow controller under low-current working condition |
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