CN107154741B - A kind of control system and method based on MMC topological structure - Google Patents
A kind of control system and method based on MMC topological structure Download PDFInfo
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- CN107154741B CN107154741B CN201710352810.7A CN201710352810A CN107154741B CN 107154741 B CN107154741 B CN 107154741B CN 201710352810 A CN201710352810 A CN 201710352810A CN 107154741 B CN107154741 B CN 107154741B
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M7/00—Conversion of ac power input into dc power output; Conversion of dc power input into ac power output
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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
- H02J3/28—Arrangements for balancing of the load in a network by storage of energy
- H02J3/32—Arrangements for balancing of the load in a network by storage of energy using batteries with converting means
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M7/00—Conversion of ac power input into dc power output; Conversion of dc power input into ac power output
- H02M7/42—Conversion of dc power input into ac power output without possibility of reversal
- H02M7/44—Conversion of dc power input into ac power output without possibility of reversal by static converters
- H02M7/48—Conversion of dc power input into ac power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode
- H02M7/483—Converters with outputs that each can have more than two voltages levels
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M1/00—Details of apparatus for conversion
- H02M1/0003—Details of control, feedback or regulation circuits
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M1/00—Details of apparatus for conversion
- H02M1/0067—Converter structures employing plural converter units, other than for parallel operation of the units on a single load
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- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Charge And Discharge Circuits For Batteries Or The Like (AREA)
- Supply And Distribution Of Alternating Current (AREA)
Abstract
The invention discloses a kind of control systems based on MMC topological structure, including master controller and submodule block controller, wherein, master controller transmits modulating wave information to submodule, submodule modulating wave compensation rate is obtained according to the local information of submodule by submodule block controller, by submodule modulating wave compensation rate and modulating wave information superposition, the Balance route to submodule is realized.This invention simplifies the information exchanges of MMC internal system, reduce the computation burden of communication pressure caused by submodule block balance and master controller, save the cost.The invention also discloses a kind of control methods based on MMC topological structure, realize submodule Balance route by submodule block controller.
Description
Technical field
The present invention relates to Operation of Electric Systems and control technology field, and in particular, to one kind is based on modular multilevel
The control system and method for inverter (MMC, Modular Multilevel Converter) topological structure.
Background technique
With increasingly sharpening for energy crisis and problem of environmental pollution, MMC relies on its better power quality, more flexible
Allocation plan, more powerful redundant ability are received significant attention and are applied.This converter topology has the modularization knot of height
Structure has very strong expansion capability, and is widely used in motor driven, Static Var Compensator, electric propulsion, power electronics
In transformer and flexible HVDC transmission system.Except conventional converter topology (such as Fig. 1 for being used as D.C. high voltage transmission using MMC
It is shown), MMC can also be expanded as energy-storage system, to provide power compensation.
Fig. 1 is three-phase MMC system topology schematic diagram, as shown in Figure 1, every phase includes upper and lower two bridge arms, Mei Geqiao
Arm is respectively by a bridge arm inductance L and n submodule (upper bridge arm submodule SMp1、SMp2……SMpn, lower bridge arm submodule SMn1、
SMn2……SMnn) formation is cascaded, upper and lower bridge arm connects to form ac output end by respective bridge arm inductance L.Fig. 2 a is Fig. 1
Shown in MMC system Neutron module half-bridge structure schematic diagram, as shown in Figure 2 a, each submodule SM includes concatenated switching device
T1And T2, and T1And T2One diode D of inverse parallel respectively1And D2, in T1And T2The both ends of series arm are connected in parallel with a capacitor device C.
For three-phase MMC energy-storage system topological structure, the difference with MMC system shown in Fig. 1 is submodule DC side
Whether energy storage device has been accessed.Fig. 2 b is MMC energy-storage system Neutron module half-bridge structure schematic diagram, wherein Bat indicates energy storage electricity
Pond is parallel to switching element T instead of capacitor C1And T2The both ends of series arm.
Traditional control system based on MMC topological structure only has master controller, for the normal operation for guaranteeing MMC, master control
Device processed generallys use open loop or closed-loop control.For MMC, centralized master controller needs to realize three control targets: ring
Flow control, submodule Balance route and power voltage control.Balance route (including common submodule generally in order to realize submodule
The equilibrium of block capacitance voltage or energy storage submodule battery SOC Balance route) need to acquire submodule real time information, specifically, control
Submodule capacitor voltage equilibrium needs to acquire submodule capacitor voltage information, and control energy storage submodule battery SOC equilibrium needs are adopted
Collect energy storage submodule battery SOC information.Fig. 3 is traditional centralized master controller data transmission schematic diagram, as shown in figure 3, will adopt
The information collected is transmitted to master controller by the signal transmssion line of high speed, and master controller passes through series of computation, compares, controls
The links such as device adjusting, obtain each submodule modulating wave, then modulation intelligence is quickly transferred to each submodule.Though the above control
It so can effectively guarantee submodule Balance route, but lack the topological structure of then tens, more then several hundred a submodules for MMC
For, it is high for the operational capability requirement of the quantity of information transmission, rate and master controller, it considerably increases due to MMC
Communication pressure and the computation burden of master controller caused by control submodule is balanced.
Summary of the invention
In view of the foregoing, it is an object to a kind of control system and method based on MMC topological structure is provided, letter
The information exchange between submodule and master controller is changed, to solve the control system of existing MMC topological structure due to submodule
The technical problem that communication pressure caused by Balance route is big and the computation burden of master controller is big.
To achieve the goals above, it is an aspect of the invention to provide a kind of control system based on MMC topological structure,
Include:
Master controller sends modulating wave information for the submodule into the MMC topological structure；And
Submodule block controller, for acquiring submodule equalization information amount and the submodule place of the submodule in real time
The current information of bridge arm, the current information of bridge arm is modulated to obtain to submodule equalization information amount in conjunction with where the submodule
Submodule modulating wave compensation rate, submodule modulating wave compensation rate and modulating wave information are overlapped, to carry out to submodule
Balance route.
Preferably, submodule block controller is distributed in each submodule, and the submodule block controller is microprocessor.
Preferably, the submodule of the MMC topological structure accesses capacitor, and the submodule equalization information amount of the submodule is
The capacitance voltage information of the submodule.
Preferably, the submodule of the MMC topological structure accesses energy-storage battery, the submodule equalization information of the submodule
Amount is state-of-charge (SOC, State Of Charge) information of the energy-storage battery.
Preferably, the submodule block controller is modulated including vertical adjusting lower in phase the submodule equalization information amount
It makes, sagging modulation includes: according to proportionality coefficient sagging in preset phase, submodule equalization information amount and the son in the phase
The current information of bridge arm, obtains the fundamental frequency AC compensation amount of the submodule, the submodule as modulation sagging in phase where module
Block modulating wave compensation rate is realized balanced in phase.
Further, it is preferable to, the submodule block controller, which is modulated the submodule equalization information amount, further includes
Alternate sagging modulation, the alternate sagging modulation includes: equal according to preset alternate sagging proportionality coefficient and the submodule
Weigh information content, obtains the HVDC Modulation offset voltage of the submodule, and the submodule modulating wave as alternate sagging modulation compensates
Amount, realizes alternate equilibrium.
Preferably, the submodule block controller modulates (PWM modulation, Pulse Width by pulse width
Modulation) closure of switching device in the submodule is controlled.
To achieve the goals above, another aspect of the present invention provides a kind of control method based on MMC topological structure, packet
It includes:
The submodule of modulating wave information to the MMC topological structure is sent by master controller；
Acquire submodule equalization information amount and the submodule place of the submodule in real time by submodule block controller
The current information of bridge arm, the current information of bridge arm is modulated the submodule equalization information amount in conjunction with where the submodule
Submodule modulating wave compensation rate is obtained, the submodule modulating wave compensation rate and the modulating wave information are overlapped, thus
Balance route is carried out to the submodule.
Preferably, the method being modulated to the submodule equalization information amount includes sagging modulation in phase, in the phase
Sagging modulation includes:
According to sagging proportionality coefficient, the submodule equalization information amount and submodule place bridge arm in preset phase
Current information, obtain the fundamental frequency AC compensation amount of the submodule, as modulation sagging in phase submodule modulating wave compensate
Amount is realized balanced in phase.
Further, the method being modulated to the submodule equalization information amount further includes alternate sagging modulation, described
It is alternate it is sagging modulation include:
According to preset alternate sagging proportionality coefficient and the submodule equalization information amount, the straight of the submodule is obtained
Modulation compensated voltage is flowed, as the submodule modulating wave compensation rate of alternate sagging modulation, realizes alternate equilibrium.
Compared with prior art, the present invention has the following advantages and beneficial effects:
The present invention replaces traditional centralized master controller using submodule block controller and master controller, is controlled by submodule
Device realizes the Balance route of submodule using the local information of submodule, reduces the communication number between submodule and master controller
Amount avoids the computation burden of communication pressure caused by submodule block balance and master controller, reduces MMC topological structure system pair
The requirement of communication line and master controller computing capability, reduces cost, and simplified control saves equipment investment.
The present invention can realize submodule capacitor voltage Balance route in traditional MMC system, can also be in MMC energy storage
Submodule battery SOC Balance route is realized in system.
Detailed description of the invention
Fig. 1 is three-phase MMC system topology schematic diagram；
Fig. 2 a is MMC system Neutron module half-bridge structure schematic diagram shown in FIG. 1；
Fig. 2 b is MMC energy-storage system topological structure Neutron module half-bridge structure schematic diagram；
Fig. 3 is traditional centralized master controller data transmission schematic diagram；
Fig. 4 is the control system schematic diagram the present invention is based on MMC topological structure；
Fig. 5 is that the present invention is based on the control system data of MMC topological structure to transmit schematic diagram；
Fig. 6 is submodule block controller control block diagram of the present invention；
Fig. 7 is sagging curve schematic diagram in submodule phase of the present invention；
Fig. 8 is the alternate sagging curve schematic diagram of submodule of the present invention.
Specific embodiment
Embodiment of the present invention described below with reference to the accompanying drawings.Those skilled in the art may recognize that
It arrives, it without departing from the spirit and scope of the present invention, can be with a variety of different modes or combinations thereof to described
Embodiment is modified.Therefore, attached drawing and description are regarded as illustrative in nature, rather than the protection for limiting claim
Range.In addition, in the present specification, attached drawing is drawn not in scale, and identical appended drawing reference indicates identical part.
By taking three-phase MMC system topology as an example, in conjunction with Fig. 4 to Fig. 8 the present invention will be described in detail embodiment.
Fig. 4 is the control system schematic diagram the present invention is based on MMC topological structure, as shown in figure 4, of the present invention be based on
The control system of MMC topological structure includes master controller and submodule block controller.
Wherein, circulation control and power voltage control of the master controller for realizing the MMC topological structure, submodule control
Device processed for realizing the MMC topological structure Balance route.The present invention is described only for Balance route.Wherein, master control
Device processed sends modulating wave information for the submodule into the MMC topological structure；Submodule block controller, preferably miniature processing
Device, for acquiring the submodule equalization information amount of the MMC topological structure Neutron module and the electricity of submodule place bridge arm in real time
Stream information, and bridge arm current information where submodule is combined to be modulated to obtain submodule modulating wave to submodule equalization information amount
Submodule modulating wave compensation rate and modulating wave information are overlapped by compensation rate, to carry out Balance route to submodule.Its
In, the current information of bridge arm is the information of submodule local where submodule equalization information amount and submodule, without master control
The participation of device processed.
Preferably, submodule block controller is distributed in each submodule, so that submodule is not necessarily to carry out information biography with the external world
It is defeated, the local information of submodule need to be only acquired, the Balance route of submodule only can be realized in submodule.
Wherein, MMC topological structure can be three-phase MMC system topology schematic diagram as shown in Figure 1, submodule access
Conventional capacitive, at this point, the local information of submodule includes the capacitance voltage information of submodule and the electric current of submodule place bridge arm
Information (wherein, the current information of bridge arm where submodule includes bridge arm current direction, amplitude and phase information), by submodule control
The collected submodule capacitor voltage information of device processed is as submodule equalization information amount, to guarantee submodule electric voltage equalization.MMC is opened up
It flutters structure and is also possible to three-phase MMC energy-storage system topological structure schematic diagram as shown in Figure 1, submodule accesses energy-storage battery, this
When, the local information of submodule includes the energy-storage battery SOC information of submodule and current information (its of submodule place bridge arm
In, the current information of bridge arm includes bridge arm current direction, amplitude and phase information where submodule), submodule block controller is adopted
The submodule energy-storage battery SOC information collected is as submodule equalization information amount, to guarantee the SOC balance of submodule.
It should be noted that MMC topological structure can be the single-phase MMC system of bridge arm and a lower bridge arm on only one
System, is also possible to the MMC system of the more bridge arms of multiphase.The submodule of MMC topological structure can be half-bridge, full-bridge or mixed type submodule
Block.
Fig. 5 is that the present invention is based on the control system data of MMC topological structure to transmit schematic diagram, as shown in figure 5, in the present invention
Transmission information in control system, only master controller are sent to the modulating wave information of submodule, by submodule block controller according to
The local information and modulating wave information of submodule carry out submodule Balance route, considerably reduce the information of MMC internal system
Exchange avoids the computation burden of the communication pressure as caused by submodule Balance route and master controller, save the cost, letter
Change control, reduces investment outlay.
Fig. 6 is submodule block controller control block diagram of the present invention, as shown in fig. 6, with the MMC system based on the more bridge arms of multiphase
It is illustrated for the control system of system topological structure, submodule block controller can be divided into the modulation of sub- module equalization information amount
Sagging modulation and alternate sagging modulation in phase, u in Fig. 6jIndicate modulating wave information, ipj、injRespectively indicate the upper and lower bridge arm electricity of j phase
Stream information (including current amplitude and phase information), is reduced to ip(n)j。
Submodule block controller is modulated submodule equalization information amount by modulation sagging in phase, realizes balanced in phase.
Specifically, sagging modulation includes: to preset sagging proportionality coefficient k in phase in phase1, submodule is acquired according to submodule block controller
Local information (wherein, the local information of submodule includes the current information and capacitance voltage information of bridge arm where submodule
Or energy-storage battery SOC information), and using in submodule local information capacitance voltage information or energy-storage battery SOC information as son
Module equalization information amount smjk, by submodule equalization information amount smjkCompared with the given value sm* of submodule block message, two are obtained
The difference of person, and the current information of submodule place bridge arm is combined to obtain submodule according to governing equation (1) sagging in phase
Fundamental frequency AC compensation amount realize balanced in phase as the submodule modulating wave compensation rate of modulation sagging in phase.
Fig. 7 is sagging curve schematic diagram in submodule phase of the present invention, as shown in fig. 7, to be based on MMC energy-storage system topology knot
For the submodule Balance route of structure, abscissa Δ SOC indicates the submodule equalization information obtained according to submodule local information
Measure smjkWith the difference of sm*, according to governing equation (1) sagging in phase, by proportionality coefficient k sagging in pre-set phase1With cross
Coordinate Δ SOC is multiplied to obtain ordinate K that (K is only used as sagging proportionality coefficient k in phase1The number being multiplied with abscissa Δ SOC
Value, has no concrete meaning), multiplied by the current information of bridge arm where submodule, the fundamental frequency AC compensation amount of submodule is obtained, is made
For the submodule modulating wave compensation rate of modulation sagging in phase, realize balanced in phase.
In formula: Δ u1p_jk、Δu1n_jkThe modulating wave for respectively indicating the upper and lower bridge arm submodule of j phase of sagging modulation in phase is mended
The amount of repaying；k1Indicate sagging proportionality coefficient in phase, i.e. in Fig. 7 in phase sagging curve slope；ipj、injIndicate the upper and lower bridge arm of j phase
Bridge arm current；smjkIndicate the equalization information amount of k-th of submodule of j phase, k=1,2 ... n ... 2n-1,2n；sm*Indicate submodule letter
The given value of breath.
The fundamental frequency AC compensation amount of submodule is overlapped with modulating wave information, to carry out balanced control to submodule
System.
Further, it further includes alternate sagging modulation that submodule block controller, which is modulated sub- module equalization information amount,.Tool
Body, alternate sagging modulation includes: to preset alternate sagging proportionality coefficient k2, according to the submodule of submodule block controller acquisition
Local information, using in submodule local information capacitance voltage information or energy-storage battery SOC information as submodule equalization information
Measure smjk, by submodule equalization information amount smjkCompared with the given value sm* of submodule block message, the difference of the two is obtained, according to
Alternate sagging governing equation (2) obtains the HVDC Modulation offset voltage of submodule, the submodule tune as alternate sagging modulation
Wave compensation rate processed, realizes alternate equilibrium.
Fig. 8 is the alternate sagging curve schematic diagram of submodule of the present invention, with the submodule based on MMC energy-storage system topological structure
For Balance route, abscissa Δ SOC indicates the submodule equalization information amount sm obtained according to submodule local informationjkWith sm*
Difference, according to alternate sagging governing equation (2), by pre-set alternate sagging proportionality coefficient k2With abscissa Δ SOC
Multiplication obtains ordinate Ud, UdIndicate the HVDC Modulation offset voltage of each submodule modulating wave superposition, the tune as submodule
Wave compensation rate processed, realizes alternate equilibrium.
Δu2_jk=k2(smjk-sm*) (2)
In formula: Δ u2_jkIndicate the modulating wave compensation rate of the submodule of alternate sagging control；k2Indicate alternate sagging ratio system
It counts, i.e. the slope of alternate sagging curve in Fig. 8；smjkIndicate the equalization information amount of k-th of submodule of j phase, k=1,2 ... n ... 2n-
1,2n；sm*Indicate the given value of submodule block message.
It is used as submodule modulating wave to compensate the HVDC Modulation offset voltage of submodule and above-mentioned fundamental frequency AC compensation amount
Amount, while the modulating wave information for being sent to submodule with master controller is overlapped, to realize the Balance route to submodule.
Preferably, the closure that submodule block controller passes through switch tube device in phase-shifting carrier wave pulse width modulation controlled submodule.
It should be noted that in the present invention, not to proportionality coefficient k sagging in phase1With alternate sagging proportionality coefficient k2It does
It is specific out to limit, sagging proportionality coefficient k in phase1With alternate sagging proportionality coefficient k2Numerical value range all in accordance with specific MMC topology
Structure and be arranged.
Since submodule parameter information is almost the same, so, sagging proportionality coefficient k in the phase of all submodules1Basic phase
Together, the alternate sagging proportionality coefficient k of all submodules2It is essentially identical, and k1And k2It is not identical.
It is above-mentioned to illustrate control system of the invention by taking the MMC system topology of the more bridge arms of multiphase as an example, and the present invention is simultaneously
It is without being limited thereto, it is equally applicable to the control of the single-phase MMC system topology based on bridge arm on only one and a lower bridge arm,
And for single-phase MMC system, only the balanced control of submodule need to can be realized by modulation submodule equalization information amount sagging in phase
System.
Another aspect of the present invention is to provide a kind of control method based on MMC topological structure, comprising:
The submodule of modulating wave information to the MMC topological structure is sent by master controller；
Acquire the submodule equalization information amount of submodule and the electricity of submodule place bridge arm in real time by submodule block controller
Stream information, the current information of bridge arm is modulated to obtain the modulation of submodule to submodule equalization information amount in conjunction with where submodule
Wave compensation rate, by modulating wave compensation rate and modulating wave information superposition, to carry out Balance route to submodule.
Preferably, the method being modulated to submodule equalization information amount includes sagging modulation in phase, specifically, according to pre-
If phase in bridge arm where sagging proportionality coefficient, submodule equalization information amount and submodule current information, obtain submodule
Fundamental frequency AC compensation amount realize balanced in phase as the submodule modulating wave compensation rate of modulation sagging in phase.
Further, for the control system based on the more bridge arm MMC topological structures of multiphase, to submodule equalization information amount into
The method of row modulation further includes alternate sagging modulation, specifically, equal according to preset alternate sagging proportionality coefficient and submodule
Weigh information content, obtains the HVDC Modulation offset voltage of submodule, real as the submodule modulating wave compensation rate of alternate sagging modulation
Existing alternate equilibrium.
The modulating wave information that above-mentioned fundamental frequency AC compensation amount and HVDC Modulation offset voltage are sent with master controller simultaneously
Superposition, realizes the Balance route of submodule.
In conclusion the present invention replaces centralized master controller, master controller using master controller and submodule block controller
The circulation control and power voltage control that need to only realize MMC topological structure, the son of MMC topological structure is realized by submodule block controller
Module Balance route enormously simplifies the information exchange of submodule and master controller.Modulating wave information is sent extremely by master controller
Submodule obtains submodule equalization information amount according to the submodule local information of acquisition by submodule block controller, and to submodule
Equalization information amount is modulated to obtain the modulating wave compensation rate of submodule, and by modulating wave compensation rate and modulating wave information superposition,
To realize the Balance route to submodule.In submodule block controller control section, sagging modulation is introduced, can be divided into sagging in phase
Modulation and alternate sagging modulation respectively obtain modulating wave compensation in conjunction with governing equation sagging in phase and alternate sagging governing equation
Amount, and the modulating wave information superposition with submodule simultaneously by the compensation rate of the two, realize the Balance route of submodule.
Submodule need to only acquire local information, greatly reduce the information transmission between submodule and master controller, drop
Low master controller calculates pressure and information transmits pressure, simplified control.
The above description is only a preferred embodiment of the present invention, is not intended to restrict the invention, for those skilled in the art
For member, the invention may be variously modified and varied.All within the spirits and principles of the present invention, it is made it is any modification,
Equivalent replacement, improvement etc., should all be included in the protection scope of the present invention.
Claims (8)
1. a kind of control system based on MMC topological structure characterized by comprising
Master controller sends modulating wave information for the submodule into the MMC topological structure；And
Submodule block controller, for acquiring the submodule equalization information amount and submodule place bridge arm of the submodule in real time
Current information, the current information of bridge arm is modulated to obtain to the submodule equalization information amount in conjunction with where the submodule
The submodule modulating wave compensation rate and the modulating wave information are overlapped by submodule modulating wave compensation rate, thus to institute
It states submodule and carries out Balance route；
Wherein, the submodule block controller is modulated including modulation sagging in phase the submodule equalization information amount, described
Sagging modulation includes: according to proportionality coefficient sagging in preset phase, submodule equalization information amount and submodule institute in phase
In the current information of bridge arm, the fundamental frequency AC compensation amount of the submodule is obtained, the submodule as modulation sagging in phase is modulated
Wave compensation rate is realized balanced in phase.
2. the control system according to claim 1 based on MMC topological structure, which is characterized in that the submodule control
Device is distributed in each submodule, and the submodule block controller is microprocessor.
3. the control system according to claim 1 based on MMC topological structure, which is characterized in that the MMC topological structure
Submodule access capacitor, the submodule equalization information amount of the submodule is the capacitance voltage information of the submodule.
4. the control system according to claim 1 based on MMC topological structure, which is characterized in that the MMC topological structure
Submodule access energy-storage battery, the submodule equalization information amount of the submodule is that the state-of-charge of the energy-storage battery is believed
Breath.
5. the control system according to claim 1 based on MMC topological structure, which is characterized in that the submodule control
It further includes alternate sagging modulation that device, which is modulated the submodule equalization information amount, and the alternate sagging modulation includes: basis
Preset alternate sagging proportionality coefficient and the submodule equalization information amount obtain the HVDC Modulation compensation electricity of the submodule
Pressure, as the submodule modulating wave compensation rate of alternate sagging modulation, realizes alternate equilibrium.
6. the control system according to claim 1 based on MMC topological structure, which is characterized in that the submodule control
Device controls the closure of switching device in the submodule by pulse width modulation.
7. a kind of control method based on MMC topological structure characterized by comprising
The submodule of modulating wave information to the MMC topological structure is sent by master controller；
Acquire the submodule equalization information amount and submodule place bridge arm of the submodule in real time by submodule block controller
Current information, the current information of bridge arm is modulated to obtain to the submodule equalization information amount in conjunction with where the submodule
The submodule modulating wave compensation rate and the modulating wave information are overlapped by submodule modulating wave compensation rate, thus to institute
It states submodule and carries out Balance route；
Wherein, the method being modulated to the submodule equalization information amount includes sagging modulation in phase, lower vertical adjusting in the phase
System includes: according to bridge arm where proportionality coefficient sagging in preset phase, the submodule equalization information amount and the submodule
Current information, obtain the fundamental frequency AC compensation amount of the submodule, as modulation sagging in phase submodule modulating wave compensate
Amount is realized balanced in phase.
8. the control method of MMC topological structure according to claim 7, which is characterized in that
It further include alternate sagging modulation to the method that the submodule equalization information amount is modulated, the alternate sagging modulation packet
It includes:
According to preset alternate sagging proportionality coefficient and the submodule equalization information amount, the direct current tune of the submodule is obtained
Offset voltage processed realizes alternate equilibrium as the submodule modulating wave compensation rate of alternate sagging modulation.
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| CN107612355B (en) * | 2017-10-17 | 2020-07-03 | 国网江苏省电力公司南通供电公司 | Distributed controller of modular matrix converter |
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