CN108683348A - C-MMC static state voltage equipoise control methods based on draw-out power supply control - Google Patents
C-MMC static state voltage equipoise control methods based on draw-out power supply control Download PDFInfo
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- CN108683348A CN108683348A CN201810630710.0A CN201810630710A CN108683348A CN 108683348 A CN108683348 A CN 108683348A CN 201810630710 A CN201810630710 A CN 201810630710A CN 108683348 A CN108683348 A CN 108683348A
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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
- 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
- H02M1/36—Means for starting or stopping converters
-
- 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)
- Inverter Devices (AREA)
Abstract
The invention discloses the C MMC static state voltage equipoise control methods controlled based on draw-out power supply, the capacitance voltage of each C MMC submodules is acquired first, find out its average value, by comparing the size of C MMC submodules voltage and target voltage, obtain meeting the draw-out power supply modulated signal of the balance of voltage between submodule.Then, two using in submodule capacitance voltage average values provide the draw-out power supply modulated signal for meeting two capacitor voltage balances in submodule by comparing the size of capacitance voltage value and desired value as the target of two capacitor voltage balances in submodule.The modulated signal relatively obtains the control signal of circuit of reversed excitation in draw-out power supply with triangular carrier.Dependent on this control signal, the input current of draw-out power supply will be adjusted, and the capacitance voltage of power module also will be adjusted indirectly.Additional circuit is not needed, and control method is simple, to reducing the loss of system and ensureing that normally startup has very important meaning to system.
Description
Technical field
The invention belongs to static state voltage equipoise controls, and in particular to a kind of C-MMC static state voltage equipoise controls based on draw-out power supply control
Method processed.
Background technology
In recent years, electric in China for the flexible DC transmission technology of core topology with modularization multi-level converter (MMC)
Application in net system is more and more extensive.Converter power module uses all-controlling power electronics device, system to use submodule
(SM, sub-module) cascade form, is easy to extend, and improves system voltage grade, reduces the switching frequency of switching device,
To reduce switching loss, output voltage waveforms more approach sine wave to reduce harmonic content.It transmits electricity different from Traditional DC
Technology, the flexible DC transmission technology based on MMC can power to passive network, can instantaneously realize active and idle independent solution
Coupling control is easily achieved multi-terminal system.In addition, flexible DC transmission technology can provide active power and idle work(to system simultaneously
Rate has advantage in the stability of the system of raising and ability to transmit electricity etc., gets the attention.MMC systems use three-phase
Bridge structure, but it is different from conventional three-phase bridge, each bridge arms of MMC are made of multiple submodule cascade, basic principle structure chart
As shown in Figure 1.At present there are mainly three types of the MMC submodule topological structures of mainstream：Half-bridge submodule (HBSM), full-bridge submodule
(FBSM) and clamp Shuangzi submodule (CDSM).Wherein, CDSM becomes one since it has the function of DC Line Fault automatism isolation
The very promising topological structure of kind, submodule is by 5 IGBT VT1-VT5And anti-paralleled diode VD1-VD5, 2 clamps two
Pole pipe VD6And VD7, 2 capacitance C1、C2And parallel resistance R1、R2, draw-out power supply and control and driving unit constitute, draw-out power supply
Using two circuit of reversed excitation of output-parallel, sub-modular structure is as shown in Figures 2 and 3.
Currently, in terms of the research for the MMC being made of CDSM is concentrated mainly on its isolated DC side failures, to it
Research in terms of the balance of voltage is relatively on the low side, and system voltage is uneven, and prodigious threat is caused to the normal operation of system.No
It is same as half-bridge submodule and full-bridge submodule, clamp Shuangzi submodule contains two capacitances, and there is only voltages between submodule not
Equilibrium problem also needs to consider the balance of voltage inside submodule between two capacitances, does not especially control pre-charging stage in MMC, by
It is completely in blocked styate in IGBT, system capacitance voltage cannot reach balance, the injustice of capacitance voltage by controlling IGBT
Weighing apparatus is more notable, will seriously affect system and normally starts operation.
Invention content
The purpose of the present invention is to overcome the above shortcomings and to provide a kind of C-MMC static state voltage equipoises based on draw-out power supply control
Control method does not control the reason of pre-charging stage influences power module capacitor voltage balance by analysis system, finds out influence
The principal element of module quiescent voltage balance derives the relationship that the influence factor influences capacitance voltage by modeling analysis.
In order to achieve the above object, the present invention includes the following steps：
Step 1 establishes C-MMC submodule current relationships according to KCL；
Step 2, the factor of analyzing influence quiescent voltage balance can determine that draw-out power supply is to influence power module capacitance
The principal element of the balance of voltage, therefore the electric current to flow into draw-out power supply controls draw-out power supply as controlled volume；
Step 3, in order to ensure the balance of voltage between C-MMC submodules, using the average value of C-MMC submodule voltages as
C-MMC submodules press target, by comparing C-MMC submodules voltage and desired value is pressed, obtain meeting between C-MMC submodules
The draw-out power supply modulated signal of the balance of voltage
Step 4, in order to ensure two capacitor voltage equalizings in C-MMC submodules, with two capacitance voltages in C-MMC submodules
Average value as pressing desired value, the voltage of each capacitance to be compared with desired value, obtain meeting electricity in C-MMC submodules
Hold the draw-out power supply modulated signal of the balance of voltage
Step 5 obtains the modulated signal of j-th of submodule draw-out power supply, i-th of circuit of reversed excitationForWithIt is folded
Add, i.e.,
Wherein, j=1,2 ..., N, i=1,2；
Step 6 finally compares modulated signalWith triangle carrier signal u (t), each flyback electricity on draw-out power supply is obtained
The control signal d on roadpji, to pass through the target for reaching capacitance voltage static balancing to the reasonable control of draw-out power supply.
In step 1, since the current relationship of each capacitance branch is the same, any one capacitance branch in C-MMC submodules
Following relationship is all had, can be obtained according to KCL：
ism=ic+iR+ip
ism=ibrig
ucAnd icRespectively capacitance voltage and electric current, iRFor the electric current of equalizing resistance, ipTo flow through the electric current of draw-out power supply,
ismFor submodule electric current, ibrigThe electric current of bridge arm where submodule.
In step 2, since the target of static state voltage equipoise is to want holding capacitor voltage constant, connect between C-MMC submodules,
C-MMC submodule electric currents ismIt is equal to bridge arm current ibrig, therefore the input current i of each modulesmIt is equal, it can from current relationship
Know, the input current i of draw-out power supplypAs influence the principal element of capacitor voltage balance.
In step 3, draw-out power supply modulated signal is obtainedThe specific method is as follows：
The first step calculates the pressure desired value u of bridge arm submoduleavr,
Second step compares C-MMC submodule capacitor voltages and the size of target voltage, determines the modulation of draw-out power supply at this time
Signal
Wherein, Δ uj=uj-uavrFor the voltage difference of C-MMC submodules each capacitance voltage and desired value, and
In step 4, draw-out power supply modulated signal is obtainedThe specific method is as follows：
The first step calculates the pressure desired value u of two capacitances in submodulejavr,
Second step compares two capacitance voltage u of C-MMC submodulesjciWith pressure target ujavrSize, obtain meet son
The draw-out power supply modulated signal of capacitor voltage balance in module
Wherein Δ ujci=ujci-ujavrFor the voltage difference of submodule each capacitance voltage and desired value, andJ=1,2 ..., N；I=1,2.
In step 6, according to the amplitude and frequency of triangular carrier, Taylor expansion is carried out to triangle carrier signal u (t), is passed through
Compare triangle carrier signal u (t) and modulated signalFinally obtain the control signal d of each circuit of reversed excitation of draw-out power supplypji,
Wherein, j=1,2 ..., N；I=1,2.
Compared with prior art, the present invention acquires the capacitance voltage of each C-MMC submodules first, finds out its average value,
It is taken at this time by comparing the size of C-MMC submodules voltage and target voltage as the target that each module capacitance is pressed
It can power modulation signal.Different from half-bridge submodule and full-bridge submodule, there are two capacitances for clamp Shuangzi submodule, are ensureing work(
Also to ensure the balance of two capacitance voltages in module, two electricity in C-MMC submodules inside while the rate intermodule balance of voltage
Hold pressure target of the average value of voltage as submodule internal capacitance, is given by comparing the size of capacitance voltage value and desired value
Go out draw-out power supply modulated signal at this time.Therefore the modulated signal of final C-MMC submodule draw-out power supplies is above-mentioned two modulated signal
Superposition, the modulated signal and triangular carrier relatively obtain the control signal of circuit of reversed excitation in draw-out power supply.Dependent on this control
The input current of signal, draw-out power supply will be adjusted, and the capacitance voltage of power module also will be adjusted indirectly.The present invention
The C-MMC static state voltage equipoise methods of proposition, do not need additional circuit, and control method is simple, to reduce system loss and
Guarantee system, which normally starts, very important meaning.
Description of the drawings
Fig. 1 is MMC system basic principle figures；
Fig. 2 is C-MMC sub-modular structure figures；
Fig. 3 is the schematic diagram of draw-out power supply and control and driving unit in Fig. 2；
Fig. 4 is pre-charging stage C-MMC submodule equivalent circuit diagrams；
Fig. 5 is Pressure and Control simulation waveform in embodiment；
Fig. 6 is that first circuit of reversed excitation controls signal in first submodule draw-out power supply in embodiment and output voltage shows
It is intended to；
Specific implementation mode
The invention will be further described below in conjunction with the accompanying drawings.
Embodiment：
C-MMC flexible direct current power transmission system DC voltage 8.8kV, 2 modules of each bridge arm, the volume of each power module
Constant voltage is 4.4kV, and using 3.3kV, the IGBT of 1kA, module topology structure is clamp Shuangzi structure.Embodiment is with bridge in a phases
It is illustrated for arm.
The present invention is based on the C-MMC static state voltage equipoise control methods of draw-out power supply control, and steps are as follows：
Step 1：The relationship between C-MMC submodule input and output electric currents is established according to KCL.
Due to before MMC starts, without electricity on C-MMC submodule capacitances, draw-out power supply being caused not have enough trigger energies
IGBT is driven to work normally, therefore, pre-charging stage system IGBT switching devices are in blocked styate, and system can only be by anti-
Parallel diode is power module capacitor charging, is pre-charged according to DC side, then C-MMC submodules can be equivalent to shown in Fig. 4
Equivalent circuit.
Wherein C1=C2=C, R1=R2=R, since each capacitance current relationship is the same, this sentences C-MMC submodules wherein
For any one capacitance, it can be obtained by KCL
ism=ic+iR+ip
ism=ibriga
uc, icFor capacitance voltage and electric current, iRFor the electric current of equalizing resistance, ipTo flow through the electric current of draw-out power supply, ismFor C-
MMC submodule electric currents, ibrigaFor bridge arm current in a phases.
Step 2：According to the principal element for the current relationship analyzing influence power module capacitor voltage balance that step 1 is established.
Because the target of static state voltage equipoise is to want holding capacitor voltage constant, connect between C-MMC submodules, C-MMC submodules
Block electric current ismIt is equal to bridge arm current ibriga, therefore the input current i of each modulesmIt is equal, from current relationship it is found that taking energy
The input current i of power supplypThe principal element of capacitor voltage balance is as influenced, therefore, the present invention is by inputting draw-out power supply
Electric current ipAdjusting, can effectively change the variation of capacitance voltage, the final balance for realizing capacitance voltage.
Step 3：Seek the draw-out power supply modulated signal for ensureing to press between C-MMC submodules
Calculate the N number of submodule average voltage u of bridge arm in a phasesavrAnd as the desired value of the C-MMC submodule balances of voltage, often
The voltage of a submodule is uj(j=1,2 ..., N), by comparing the size of submodule capacitor voltage and desired value, is met
The draw-out power supply modulated signal of the balance of voltage between C-MMC submodules
(1) the pressure desired value u of bridge arm submodule is calculated firstavr
(2) by comparing the size of C-MMC submodule capacitor voltages and target voltage, the modulation of draw-out power supply at this time is determined
Signal
Wherein, Δ uj=uj-uavrFor the voltage difference of C-MMC submodules each capacitance voltage and desired value, and
Step 4：Seek the draw-out power supply modulated signal for ensureing to press in C-MMC submodules
The pressure desired value u of two capacitances in C-MMC submodules is calculated firstjavr
By comparing two capacitance voltage u of C-MMC submodulesjci(j=1,2 ..., N；I=1,2 target u) and is pressedjavr
Size, obtain the draw-out power supply modulated signal for meeting capacitor voltage balance in C-MMC submodules
Wherein, Δ ujci=ujci-ujavrFor the voltage difference of C-MMC submodules each capacitance voltage and desired value, and
Step 5：The final modulated signal of each circuit of reversed excitation of draw-out power supplyForWithSuperposition, i.e.,
Step 6：By comparing modulated signalWith triangle carrier signal u (t), each circuit of reversed excitation of draw-out power supply is obtained
Control signal dpji。
Triangular carrier amplitude is 1, frequency 120Hz, carries out Taylor expansion to it, can obtain
By comparing triangle carrier signal u (t) and modulated signalFinally obtain each circuit of reversed excitation of draw-out power supply
Control signal dpji。
According to above-mentioned steps, it can be achieved that the C-MMC static state voltage equipoises control based on draw-out power supply control, static system are voltage-controlled
Simulation waveform processed is as shown in figure 5, draw-out power supply control is added in 1s, from simulation waveform as can be seen that side proposed by the present invention
Method can obtain good voltage equalizing, and Fig. 6 is first circuit of reversed excitation control signal and output in first module draw-out power supply
Voltage waveform, it can be seen that control signal break height changes, and embodies the control action of draw-out power supply, can similarly obtain it
Its capacitance corresponds to the control signal and output voltage waveforms of draw-out power supply.It is soft according to the C-MMC based on draw-out power supply control
Property DC transmission system static state voltage equipoise method, can realize system under the premise of not increasing system cost, using simple algorithm
System static state voltage equipoise has established the first step of system normal operation to ensure that the safe and reliable startup of system.
Claims (6)
1. the C-MMC static state voltage equipoise control methods based on draw-out power supply control, which is characterized in that include the following steps：
Step 1 establishes C-MMC submodule current relationships according to KCL；
Step 2 controls draw-out power supply using the electric current for flowing into draw-out power supply as controlled volume；
Step 3 presses target, by comparing C-MMC submodules using the average value of C-MMC submodule voltages as C-MMC submodules
Block voltage and desired value is pressed, obtains meeting the draw-out power supply modulated signal of the balance of voltage between C-MMC submodules
Step 4, using the average value of two capacitance voltages in C-MMC submodules as pressing desired value, the voltage of each capacitance with
Desired value is compared, and obtains the draw-out power supply modulated signal for meeting capacitor voltage balance in C-MMC submodules
Step 5 obtains the modulated signal of j-th of submodule draw-out power supply, i-th of circuit of reversed excitationForWithSuperposition, i.e.,
Wherein, j=1,2 ..., N, i=1,2；
Step 6 finally compares modulated signalWith triangle carrier signal u (t), each circuit of reversed excitation on draw-out power supply is obtained
Control signal dpji, to pass through the target for reaching capacitance voltage static balancing to the reasonable control of draw-out power supply.
2. the C-MMC static state voltage equipoise control methods according to claim 1 based on draw-out power supply control, which is characterized in that
In step 1, since the current relationship of each capacitance branch is the same, in C-MMC submodules any one capacitance branch all have as
Lower relationship, can obtain according to KCL：
ism=ic+iR+ip
ism=ibrig
ucAnd icRespectively capacitance voltage and electric current, iRFor the electric current of equalizing resistance, ipTo flow through the electric current of draw-out power supply, ismFor
Submodule electric current, ibrigFor the electric current of bridge arm where C-MMC submodules.
3. the C-MMC static state voltage equipoise control methods according to claim 1 based on draw-out power supply control, which is characterized in that
In step 2, since the target of static state voltage equipoise is to want holding capacitor voltage constant, connect between C-MMC submodules, C-MMC submodules
Block electric current ismIt is equal to bridge arm current ibrig, therefore the input current i of each modulesmIt is equal, from current relationship it is found that taking energy electricity
The input current i in sourcepAs influence the principal element of capacitor voltage balance.
4. the C-MMC static state voltage equipoise control methods according to claim 1 based on draw-out power supply control, which is characterized in that
In step 3, draw-out power supply modulated signal is obtainedThe specific method is as follows：
The first step calculates the pressure desired value u of bridge arm submoduleavr,
Second step compares C-MMC submodule capacitor voltages and the size of target voltage, determines the modulated signal of draw-out power supply at this time
Wherein, Δ uj=uj-uavrFor the voltage difference of C-MMC submodules each capacitance voltage and desired value, and
5. the C-MMC static state voltage equipoise control methods according to claim 1 based on draw-out power supply control, which is characterized in that
In step 4, draw-out power supply modulated signal is obtainedThe specific method is as follows：
The first step calculates the pressure desired value u of two capacitances in submodulejavr,
Second step compares two capacitance voltage u in C-MMC submodulesjciWith pressure target ujavrSize, obtain meeting submodule
The draw-out power supply modulated signal of interior capacitor voltage balance
Wherein Δ ujci=ujci-ujavrFor the voltage difference of each capacitance voltage and desired value in submodule, andj
=1,2 ..., N；I=1,2.
6. the C-MMC static state voltage equipoise control methods according to claim 1 based on draw-out power supply control, which is characterized in that
In step 6, according to the amplitude and frequency of triangular carrier, Taylor expansion is carried out to triangle carrier signal u (t), by comparing triangle
Carrier signal u (t) and modulated signalFinally obtain the control signal d of each circuit of reversed excitation of draw-out power supplypji,
Wherein, j=1,2 ..., N；I=1,2.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN112803813A (en) * | 2021-01-22 | 2021-05-14 | 特变电工西安电气科技有限公司 | Static voltage balance control method and system for capacitor of modular multilevel converter |
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