CN109004866A - Hexagonal structure can present three port of type cascade converter topology and control method - Google Patents
Hexagonal structure can present three port of type cascade converter topology and control method Download PDFInfo
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- CN109004866A CN109004866A CN201811026071.3A CN201811026071A CN109004866A CN 109004866 A CN109004866 A CN 109004866A CN 201811026071 A CN201811026071 A CN 201811026071A CN 109004866 A CN109004866 A CN 109004866A
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02P—CONTROL OR REGULATION OF ELECTRIC MOTORS, ELECTRIC GENERATORS OR DYNAMO-ELECTRIC CONVERTERS; CONTROLLING TRANSFORMERS, REACTORS OR CHOKE COILS
- H02P5/00—Arrangements specially adapted for regulating or controlling the speed or torque of two or more electric motors
- H02P5/74—Arrangements specially adapted for regulating or controlling the speed or torque of two or more electric motors controlling two or more ac dynamo-electric motors
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02P—CONTROL OR REGULATION OF ELECTRIC MOTORS, ELECTRIC GENERATORS OR DYNAMO-ELECTRIC CONVERTERS; CONTROLLING TRANSFORMERS, REACTORS OR CHOKE COILS
- H02P27/00—Arrangements or methods for the control of AC motors characterised by the kind of supply voltage
- H02P27/04—Arrangements or methods for the control of AC motors characterised by the kind of supply voltage using variable-frequency supply voltage, e.g. inverter or converter supply voltage
- H02P27/047—V/F converter, wherein the voltage is controlled proportionally with the frequency
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Abstract
The present invention relates to converters technical fields, three port of type cascade converter topology and control method can be presented more particularly to hexagonal structure, the topology is by hexagon converter and existing middle-and-high voltage system motor driven tradition H bridge cascade multilevel converter efficient combination, it is connect again via Multiple coil phase-shifting transformer with AC network, it is allowed to expand three port organizations for single-input double-output, to meet the operation demand of dual motors system difference operating condition.Because only increasing front end input to the modular unit on the bridge arm of hexagon converter part, therefore the quantity of power electronic devices needed for converter and phase-shifting transformer secondary side winding can be greatly decreased.Simultaneously, for solve unit front end input it is default caused by system power it is unbalance the problems such as, also further analyze the inner link between loop current and converter bridge arm power, by the power balancing method controlled based on loop current, the topology is made to can be realized stable operation and energetic interaction.
Description
Technical field
The invention belongs to three ports of type that can present of converters technical field more particularly to hexagonal structure to cascade
Converter topology and control method.
Background technique
With the fast development of power electronic devices and its control technology, multi-level converter is increasingly becoming high-power transformation
The principal mode of device.Wherein, Cascade H bridge converter realizes height using multiple concatenated structures of single-phase full bridge converter
Voltage, the output of more level, have harmonic wave of output voltage few, and output voltage change rate is small, and modular construction is easy to the advantages that expanding,
It is provided a great convenience for later period industrial production and maintenance, thus in the driving and speed regulation of industry especially alternating current asynchronous machine
Field is applied widely.
Conventional transducers currently on the market are broadly divided into two kinds, i.e., one for the driving method of mesohigh motor load
Converter drives " one-to-one " mode of a motor, and " one drag more " that drives multiple motors to run simultaneously simultaneously is just
Formula.However, will lead to the quantity of required converter using " one-to-one " mode when system needs to adjust the speed multiple electric motors
Proportional increase, production cost correspondingly increase；Using freely the work and frequent adjusting the speed to more motors again of " one drag more " mode
Operating condition has larger restriction, therefore comes into being for the access and energetic interaction, multiport converter for realizing multisystem.Using module
It is to realize high power density, high-conversion rate, reduce volume, reduce cost that multiplex mode, which is formed by hexagon multi-port structure,
A kind of important means, under the conditions of control is reasonable, moreover it is possible to shorten the energy flux path between port, reduce energy loss.
At this stage, hexagon converter only has both ends mouth structure, and Single port inputs Single port output, is commonly used for and two
Motor is respectively connected with, and the active power and reactive power flexible communication that a certain motor is issued are to another motor.If but two
Electric operation, the system lack energy front end to motor simultaneously, if the dual motors system has power surplus output, this energy again can not
It is utilized effectively, thus the topology working forms are inflexible, operation strategies are not extensive enough.
Summary of the invention
The object of the present invention is to provide a kind of only defeated to the modular unit increase front end on the bridge arm of hexagon converter part
The three ports cascade converter topology entered, to drive two mesohigh heavy-duty motors while run.One is additionally provided simultaneously
The power balancing method that kind is controlled based on loop current.
To achieve the above object, the technical solution adopted by the present invention is that: a kind of hexagonal structure can present three port level of type
Join converter topology, including the first alternating current generator and the second alternating current generator；The six of composition is successively joined end to end including six groups of bridge arms
Side shape structure, every group of bridge arm include the inductance of n H bridge inverter cascade module and series connection with it, the positive integer that n is >=1；
The vertex of hexagon is respectively R, W, S, U, T, V in the direction of the clock, and wherein RST is first group of three-phase alternating current output
Port, UVW is second group of three-phase alternating current output port, and first, second group of three-phase alternating current output port is exchanged with first respectively
Motor and the connection of the second alternating current generator；
Six groups of bridge arms are followed successively by A to F, wherein tri- bridge arm of ACE is all made of the energy feedback based on three-phase PWM current rectifying front-end
Unit, including three phase bridge all control converter circuit are in parallel with DC voltage lateral capacitance, H bridge inverter；The three phase bridge all control change of current
The input terminal of circuit is connected by phase-shifting transformer with local AC network, obtains tri- bridge arm of ACE directly from alternating current net side
Electric energy；And the capacitor cell that tri- bridge arm of BDF is all made of vertical compression lateral capacitance and H bridge inverter parallel connection is constituted, each H bridge inverter cascade
Module output port is sequentially connected in series, and constitutes cascade module output；
Six groups of bridge arms, which are connected, to be formed ring structure and provides access for loop current, the electric energy obtained from local alternating current net side
It is circulated in whole bridge arms by loop current, realizes that energetic interaction, tri- bridge arm of BDF pass through loop current indirect gain electric energy,
To drive load running by two output ports.
In capable of presenting in three port of type cascade converter topology for above-mentioned hexagonal structure, tri- bridge arm of ACE is active bridge arm,
Tri- bridge arm of BDF is passive bridge arm；The phase-shifting transformer first side winding of active bridge arm power supply front end connection shares, secondary side winding
Phase shift successively lags π/3n.
In the control method that can present three port of type cascade converter topology of above-mentioned hexagonal structure, including inverter side
Control strategy and rectification side control strategy；Inverter side control strategy is using perseverance V/f control, carrier level phase shift PS-PWM modulation；
Rectification side control strategy is in the tri- bridge arm front end ACE using three-phase PWM rectification control；Specific step is as follows:
Step 1 balances DC capacitor voltage in each bridge arm of integrally-regulated and vertical compression balancing unit adjusting maintenance by vertical compression
It is balanced；
Step 2 is superimposed loop current control on the basis of the control of converter RST port voltage；
Step 3, twin nuclei voltage control outer ring use pi controller, current control inner ring use ratio control
Device and electric voltage feed forward unit processed, while injecting zero-sequence component；The power margin for issuing the first, second motor is fed back to power grid
Side.
In the control method that can present three port of type cascade converter topology of above-mentioned hexagonal structure, step 1, step
2 realization the following steps are included:
(1), the rated frequency and initial phase signal for giving the first, second alternating current generator respectively, again by permanent V/f control
It is balanced through vertical compression and integrally-regulated obtains the first, second alternating current generator phase voltage amplitude control signal；
(2) the stacked rings flow control instructions v on the voltage control instructions of first motor exchangeN *, through vertical compression balancing unit tune
Section is converted into each bridge arm voltage instruction, is modulated by carrier level phase shift PS-PWM, generates the switch control letter of each cascade module
Number；
(3) the whole control of vertical compression balance uses maximum voltage error back-and-forth method, and each bridge arm cascade module direct current is flattened
Mean value and its setting value Edc *Compare, selects maximum deflection difference value to be sent into proportional integration link and obtain control instruction V1 *And V2 *；
(4) all cascades on each module vertical compression lateral capacitance voltage and same bridge arm that the control of vertical compression balancing unit will test
The mean value of module capacitance voltage compares, and then carries out proportional integration, and acquired results are multiplied to obtain the grade again with the bridge arm current
The deviation of gang mould block modulated signal；Each cascade module reference voltage instruction of six groups of bridge arms divides after horizontal phase shift PS-PWM modulation
It is not sent to each cascade module as switch control signal, the triangular carrier phase of n cascade module successively lags π/n.
The beneficial effects of the present invention are: front end input only is increased to the modular unit on hexagon converter half bridge arm,
The quantity of power electronic devices needed for converter and phase-shifting transformer secondary side winding is greatly reduced.Also, it can be by electric energy
It reversely is delivered to grid side, is used for other loads in system.It uses and control is balanced with vertical compression and loop current control is
The permanent v/f of the heart is controlled, and the size by adjusting loop current enables energy to evenly distribute and shift between each bridge arm, to keep away
Exempt from the voltage caused by energy is accumulated on capacitor to increase.Pass through the inherence between analysis loop current and converter bridge arm power
Connection proposes the power balancing method based on loop current control, the topology is made to can be realized stable operation and energetic interaction.
Detailed description of the invention
Fig. 1 is that three port of type that can present of one embodiment of the invention hexagonal structure cascades converter topology main circuit structure
Figure；
Fig. 2 (a) is that three port of type that can present of one embodiment of the invention hexagonal structure cascades converter topology independent three
Angular power supply equivalent model figure；
Fig. 2 (b) be one embodiment of the invention hexagonal structure can present three port of type cascade converter topology RST it is symmetrical
Triangle power supply equivalent model figure；
Fig. 2 (c) be one embodiment of the invention hexagonal structure can present three port of type cascade converter topology UVW it is symmetrical
Triangle power supply equivalent model figure；
Fig. 3 is that three port of type that can present of one embodiment of the invention hexagonal structure cascades the control of converter topology inverter side
Strategic process figure；
Fig. 4 is that three port of type that can present of one embodiment of the invention hexagonal structure cascades the control of converter topology rectification side
Strategic process figure.
Specific embodiment
Embodiments of the present invention are described in detail with reference to the accompanying drawing.
The present embodiment is to convert hexagon converter and existing middle-and-high voltage system motor driven tradition H bridge cascade connection multi-level
Device efficient combination, then front end input is increased to hexagonal part bridge arm by Multiple coil phase-shifting voltages device, it is single defeated for being allowed to expand
Three port organizations for entering dual output, to drive two motors to run under various operating conditions.The present embodiment is realized between three ports
Energetic interaction, in addition to a motor braking, the working method of motor powered operation can when the running under braking simultaneously of two motors
Electric energy is reversely delivered to grid side, is used for other loads in system.
It is achieved through the following technical solutions, a kind of hexagonal structure can present three port of type cascade converter topology, should
Topology is successively joined end to end by six groups of bridge arms and constitutes hexagonal structure, every group of bridge arm include multiple H bridge inverter cascade modules with
Series inductance.Six vertex of hexagon can be divided into two groups, form two output ports and be separately connected two AC systems, such as Fig. 1
Shown RST is one group, and UVW is one group.Six bridge arm number consecutively A to F, inside the H bridge inverter cascade module on every group of bridge arm
Structure can be divided into two classes.Tri- bridge arm of ACE in topology, is all made of the energy feedback unit based on three-phase PWM current rectifying front-end, by three
Phase bridge-type controls that converter circuit and DC voltage lateral capacitance, H bridge inverter is in parallel constitutes entirely.Wherein, the input terminal of three-phase bridge passes through
Phase-shifting transformer is connected with local AC network, so that ACE bridge arm be enable directly to obtain electric energy from alternating current net side.In topology
Tri- bridge arm of BDF, be all made of the capacitor cell that vertical compression lateral capacitance and H bridge inverter parallel connection are constituted, each H bridge inverter cascade module
Output port is sequentially connected in series.The six bridge arms ring structure to be formed of connecting can provide access for loop current, the electricity obtained from net side
Loop current i can be passed throughcirIt circulates in whole bridge arms, realizes energetic interaction, therefore bridge arm BDF can be obtained therefrom indirectly
Electric energy is taken, and then drives load running by two output ports.
To simplify circuit structure, it is easy to carry out bridge arm power analysis, every bridge arm equivalent is controllable AC by the present embodiment
Voltage source and the concatenated model of impedance, and then the equivalent model of converter topology is obtained, as shown in Fig. 2 (a), two in equivalent model
The adjacent bridge arm of group provides line voltage for one group of motor, therefore topology further can be equivalent to two groups of imaginary independent triangle electricity in space
Source, respectively two groups of load supplyings, as shown in Fig. 2 (b), Fig. 2 (b).For the ease of carrying out electric current calculating and analysis, it is assumed that two etc.
It is full symmetric to imitate triangle power supply.In figure, vaTo vfFor bridge arm voltage, iaTo ifFor bridge arm current, ir、iuDeng mutually electric to load
Stream, vr、vuDeng for load phase voltage, irt、ivuDeng for equivalent triangular source current.
In order to realize that each bridge arm voltage is stablized, power flow direction is flexibly controlled, runs two motors under different operating conditions simultaneously,
The present embodiment controls plan by the Dual-motors Driving that mathematical modeling and power analysis establish based on tradition perseverance V/f control
Slightly method specifically include as shown in Figure 3,4: maintain DC capacitor voltage equilibrium in each bridge arm vertical compression balance it is integrally-regulated and
Vertical compression balancing unit is adjusted；The loop current control being superimposed on the basis of the control of converter RST port voltage；To realize energy
Feedback and the three-phase PWM set by the tri- bridge arm front end ACE rectification control.
When it is implemented, three port of type that can present that Fig. 1 show a kind of hexagonal structure cascades converter topology structure chart,
The topology includes n H bridge inverter cascade module and series electrical by six groups of bridge arm hexagonal structures in series, every group of bridge arm
Sense, six vertex of hexagon can be divided into two groups of formation, two output ports, and wherein RST is one group, and the port of formation is handed over first
Galvanic electricity machine is connected, and UVW is one group, and the port of formation is connected with the second alternating current generator, N1、N2Respectively two electric moter voltage neutral points.
Six bridge arm number consecutively A to F, wherein ACE bridge arm has current rectifying front-end, hereinafter referred to as active bridge arm, before BDF bridge arm is without rectification
End, then it is corresponding to be referred to as passive bridge arm.The phase-shifting transformer first side winding that the power supply front end of active bridge arm is connected shares, and two
Secondary side winding phase shift successively lags π/3n.Using such mixed structure, only part bridge arm has PWM current rectifying front-end, can reduce shifting
The quantity of switching device in the number and rectification circuit of phase transformer secondary side winding, while being suitable for motor difference operating condition
Demand.
According to the different working condition of the first, second alternating current generator, there are four kinds of situations for this topology power flow direction: first hands over
When galvanic electricity machine and the second alternating current generator are in motoring condition, active power and reactive power are obtained from local power grid side；The
The reversed output power of one alternating current generator is taken less than the second alternating current generator, and the first alternating current generator is from local power grid side and load
1 two aspects obtain electric energy；The reversed output power of first alternating current generator is greater than the second alternating current generator and is taken, the first alternating current generator
The Partial Power of sending is sent into load 2 and is used as driving, and remaining output power is reversely fed back to alternating current net side；First alternating current generator
When being simultaneously emitted by power with the second alternating current generator, whole power that the two issues reversely are conveyed to local AC network.To realize
Motor stable operation under above four kinds of operating conditions adjusts the power flow direction in topology, and the control of the converter includes inverter side control
System strategy and rectification side control strategy two parts.
Inverter side control strategy is controlled by permanent V/f, based on carrier level phase shift PS-PWM modulation, and vertical compression balance control is adopted
Voltage control signal is modified with worst error back-and-forth method, control block diagram is as shown in Figure 3.First, second is given respectively to hand over
The rated frequency of galvanic electricity machine and initial phase signal are balanced again through vertical compression by permanent V/f control and integrally-regulated obtain machine phase voltages
Amplitude control signal.Since this topology bridge arm ACE has power supply front end, bridge arm BDF non-transformer front end, therefore works as motor stabilizing and transport
Power when row on BDF bridge arm should remain zero, and vertical compression lateral capacitance voltage remains constant.Such as the loop current control section Fig. 3 (a)
Shown, the present embodiment realizes this target using circulation control, i.e., folds on the voltage control instructions of the first alternating current generator of the end RST
Add circulation control instruction vN*, it is adjusted after through vertical compression balancing unit, is then converted to each bridge arm voltage instruction, passes through phase-shifting carrier wave
Modulation, generates the switch control signal of each cascade module.
If the rated frequency of the first, second alternating current generator is respectively f1、f2, utilize instantaneous power calculation formula px=vx·ix
(x=a, b ... f) calculate each bridge arm power, it is known that each bridge arm power is made of seven kinds of frequency components, i.e., DC component,
Frequency f1Component, frequency f2Component, frequency 2f1Component, frequency 2f2Component, frequency f1+f2Component, frequency f1-f2Component.ACE tri-
The DC component of bridge arm power, frequency f1-f2Component is equal, and the phase of remaining frequency component successively lags 2 π/3, can after superposition
It eliminates.This rule is equally applicable for BDF bridge arm, but the power difference frequency component of B bridge arm is identical as A bridge arm size, contrary.
It follows that the DC component and difference frequency component in instantaneous power are to influence two key factors of topological Energy distribution.In conjunction with
The instantaneous power formula of load, by taking B bridge arm as an example, its power DC component be may be expressed as:
Wherein pm1、pm2、qm1、qm2The instantaneous active power of respectively the first alternating current generator and the second alternating current generator and idle
Power can be obtained by real-time monitoring.Due to bridge arm BDF non-transformer front end, therefore when motor stabilizing operation, Ying You:
Convolution (1) (2) can obtain generator neutral point voltage difference vNWith circulation icirRelational expression:
In order to find neutral point voltage difference vNWith circulation icirRelationship, now opened up with n H bridge inverter cascade module of x bridge arm
For flutterring, voltage and current analysis is carried out.If the total output voltage of bridge arm is vx, wherein the output of n-th of H bridge inverter cascade module
Voltage is vo(xn), all H bridge inverter cascade module output voltages and be vo(x), for the bridge arm output voltage, have
For entire hexagonal topology, can be obtained according to Kirchhoff's second law
Formula i is calculated in conjunction with loop galvanometercir=(ia+ib+ic+id+ie+if)/6 can by formula (5) can abbreviation be
If the SPWM modulated signal wave of bridge arm x is vm(x), carrier amplitude VCm, each unit capacitance voltage on same bridge arm
It is approximately equal, it is denoted as Edc(x), then in a switch periods TcIt is interior, the bridge arm port voltage containing n grades of H bridge inverter cascade modules
It is represented by
The port voltage of six bridge arms is added, using mean value model analytic approach, marriage relation formula vm(a)+vm(c)+vm(e)=
3v* N, vm(b)+vm(d)+vm(f)=-3v* NSimplified expression can be obtained:
Wherein,The respectively average value of ACE bridge arm and BDF bridge arm capacitance voltage.Convolution (6)
(8), proportionality coefficient k is introduced1Neutral point voltage difference v can be obtainedNWith loop current icirRelational expression:
Through above to topological Equivalent Modeling and power analysis it is found that the control of loop current is that maintenance system is stable
One key factor.In order to realize the energetic interaction between active bridge arm and passive bridge arm, neutral point voltage command vN* it needs with evidence
The variation of the operating status of system and change, and then adjust loop current value and realize power-balance, calculation formula is by formula (3)
(9) arranging can obtain:
Wherein k2For proportionality coefficient, ACE bridge arm, BDF bridge arm DC voltage average valueDetection can be passed through
It obtains.
If vertical compression balances shown in integrally-regulated part (b) in Fig. 3, the whole control of vertical compression balance uses maximum voltage error
Back-and-forth method, by each bridge arm unit DC voltage average value and its setting value Edc* compare, maximum deflection difference value is selected to be sent into proportional integration
Link obtains control instruction V1And V *2*。
As shown in vertical compression balancing unit control section (c) in Fig. 3, each module vertical compression lateral capacitance voltage that will test
Edc(xk)(x=a, b ..., f, k=0,1 ..., n) with same bridge arm on all module capacitance voltages mean value Edc(x)It compares, with
Afterwards carry out proportional integration (PI), acquired results again with bridge arm current ixIt is multiplied and the deviation of the module modulated signal can be obtained
Value.Each modular unit reference voltage instruction of six bridge arms is sent to each unit as switch control respectively after horizontal phase shift PS-PWM modulation
The triangular carrier phase of signal processed, n H bridge inverter cascade module successively lags π/n.
Power margin to issue the first, second alternating current generator is fed back to grid side, the rectification side that the present embodiment uses
Control strategy block diagram is as shown in Figure 4.The voltage control outer ring of twin nuclei uses proportional integration (PI) controller, electric current control in figure
Inner ring processed uses proportional controller and electric voltage feed forward unit, while injecting zero-sequence component to mention high control precision.
It should be understood that the part that this specification does not elaborate belongs to the prior art.
Although being described in conjunction with the accompanying a specific embodiment of the invention above, those of ordinary skill in the art should
Understand, these are merely examples, various deformation or modification can be made to these embodiments, without departing from original of the invention
Reason and essence.The scope of the present invention is only limited by the claims that follow.
Claims (4)
1. a kind of hexagonal structure can present three port of type cascade converter topology, including the first alternating current generator and the second alternating current
Machine；It is characterized in that successively joining end to end the hexagonal structure of composition including six groups of bridge arms, every group of bridge arm includes n H bridge inverter
The inductance of cascade module and series connection with it, the positive integer that n is >=1；
The vertex of hexagon is respectively R, W, S, U, T, V in the direction of the clock, and wherein RST is first group of three-phase alternating current output end
Mouthful, UVW be second group of three-phase alternating current output port, and first, second group of three-phase alternating current output port respectively with the first alternating current
Machine and the connection of the second alternating current generator；
Six groups of bridge arms are followed successively by A to F, wherein and tri- bridge arm of ACE is all made of the energy feedback unit based on three-phase PWM current rectifying front-end,
It is in parallel with DC voltage lateral capacitance, H bridge inverter including three phase bridge all control converter circuit；Three phase bridge all control converter circuit
Input terminal is connected by phase-shifting transformer with local AC network, and tri- bridge arm of ACE is made directly to obtain electric energy from alternating current net side；And
The capacitor cell that tri- bridge arm of BDF is all made of vertical compression lateral capacitance and H bridge inverter parallel connection is constituted, each H bridge inverter cascade module are defeated
Exit port is sequentially connected in series, and constitutes cascade module output；
Six groups of bridge arms, which are connected, to be formed ring structure and provides access for loop current, and the electric energy obtained from local alternating current net side passes through
Loop current circulates in whole bridge arms, realizes that energetic interaction, tri- bridge arm of BDF pass through loop current indirect gain electric energy, thus
Load running is driven by two output ports.
2. hexagonal structure as described in claim 1 can present three port of type cascade converter topology, characterized in that ACE tri-
Bridge arm is active bridge arm, and tri- bridge arm of BDF is passive bridge arm；The phase-shifting transformer first side winding of active bridge arm power supply front end connection
It shares, secondary side winding phase shift successively lags π/3n.
3. such as the control that can present three port of type cascade converter topology of hexagonal structure of any of claims 1-2
Method, characterized in that including inverter side control strategy and rectification side control strategy；Inverter side control strategy use perseverance V/f control,
Carrier level phase shift PS-PWM modulation；Rectification side control strategy is in the tri- bridge arm front end ACE using three-phase PWM rectification control；Tool
Steps are as follows for body:
Step 1 balances integrally-regulated adjust with vertical compression balancing unit by vertical compression and maintains DC capacitor voltage in each bridge arm balanced；
Step 2 is superimposed loop current control on the basis of the control of converter RST port voltage；
Step 3, twin nuclei voltage control outer ring use pi controller, current control inner ring use proportional controller
With electric voltage feed forward unit, while zero-sequence component is injected；The power margin for issuing the first, second motor is fed back to grid side.
4. the control method that can present three port of type cascade converter topology of hexagonal structure as claimed in claim 3, special
Sign is, step 1, step 2 realization the following steps are included:
(1), the rated frequency and initial phase signal for giving the first, second alternating current generator respectively, by permanent V/f control again through straight
Pressing weighing apparatus is integrally-regulated to obtain the first, second alternating current generator phase voltage amplitude control signal；
(2) the stacked rings flow control instructions v on the voltage control instructions of first motor exchangeN *, adjust, turn through vertical compression balancing unit
Each bridge arm voltage instruction is turned to, is modulated by carrier level phase shift PS-PWM, generates the switch control signal of each cascade module；
(3) the whole control of vertical compression balance uses maximum voltage error back-and-forth method, by each bridge arm cascade module DC voltage average value
With its setting value Edc *Compare, selects maximum deflection difference value to be sent into proportional integration link and obtain control instruction V1 *And V2 *；
(4) all cascade modules on each module vertical compression lateral capacitance voltage and same bridge arm that the control of vertical compression balancing unit will test
The mean value of capacitance voltage compares, and then carries out proportional integration, and acquired results are multiplied to obtain this grade of gang mould again with the bridge arm current
The deviation of block modulated signal；Each cascade module reference voltage instruction of six groups of bridge arms is sent respectively after horizontal phase shift PS-PWM modulation
Toward each cascade module as switch control signal, the triangular carrier phase of n cascade module successively lags π/n.
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| CN113437891A (en) * | 2021-07-01 | 2021-09-24 | 武汉大学 | AC/DC multi-port hexagonal modular multilevel converter and control method |
| CN113541510A (en) * | 2021-08-06 | 2021-10-22 | 清华大学 | Alternating current-direct current electric energy conversion system and method |
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