CN110224428A - Four switch models of three-phase prediction fault tolerant control method and device based on electric current reconstructing - Google Patents
Four switch models of three-phase prediction fault tolerant control method and device based on electric current reconstructing Download PDFInfo
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- H02J3/382—
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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
- H02M7/53—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 using devices of a triode or transistor type requiring continuous application of a control signal
- H02M7/537—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 using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only, e.g. single switched pulse inverters
- H02M7/5387—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 using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only, e.g. single switched pulse inverters in a bridge configuration
- H02M7/53871—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 using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only, e.g. single switched pulse inverters in a bridge configuration with automatic control of output voltage or current
- H02M7/53875—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 using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only, e.g. single switched pulse inverters in a bridge configuration with automatic control of output voltage or current with analogue control of three-phase 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
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Abstract
The application switchs fault-tolerant converter for three-phase four, proposes a kind of model prediction power control strategy based on electric current reconstructing.Fault-tolerant three-phase grid converter voltage status equation under two-phase static coordinate is established, power prediction expression formula has been obtained.When bridge arm failure occurs for converter and ac sensor fails, using voltage vector and current relationship, three-phase current is reconstructed, the Model Predictive Control of fault-tolerant converter is participated in.Carry out stable state and dynamic emulation and experiment, the result shows that, proposed by the present invention based under electric current reconstructing model prediction power control, grid-connection converter can be realized the fault-tolerant continuous operation under switch bridge arm and current sensor twin failure, and have good stable state and dynamic property.
Description
Technical field
The application belongs to converters Fault Control technical field, more particularly, to a kind of based on electric current reconstructing
Four switch converters model prediction fault tolerant control method of three-phase and device.
Background technique
Environment in recent years problem increasingly obtains the concern of people, and can effectively improve environment using cleaning new energy,
With the needs of new-energy grid-connected, grid-connection converter has obtained extensive research.The performance of grid-connection converter is in new-energy grid-connected
Play the role of vital, the operation of entire grid-connected system is just influenced whether when grid-connection converter breaks down, so electric power
The integrity problem of electronic converter gradually becomes research hotspot, and conventional three-phase six is reconstructed into three after switching grid-connection converter failure
Phase four switchs (Three Phases Four Switches, TPFS) fault-tolerant architecture, ensures grid-connection converter bridge arm switch fault
Fault-tolerant operation afterwards.
Control for grid-connection converter, traditional control method include linear PI control, track with zero error etc..PI control pair
The proportionality coefficient that the control performance of grid-connection converter depends on pi regulator designs, but proportionality coefficient but not mature calculating
Method；Track with zero error structure is simple, but higher for mathematical model required precision.In order to further increase grid-connection converter
Performance, in recent years, since control strategy is simple, good robustness does not use nonlinear control method such as Model Predictive Control
The advantages that PWM wave is modulated has obtained extensive research and application.Model Predictive Control is mainly characterized by using system model predictions
Control the change in future of variable.According to optimization criterion predetermined, optimal mode of operation is determined.
For grid-connection converter, biphase current is measured in net side usually using two current sensors, is then calculated
Third phase current out.Model Predictive Control goes out optimal switch letter of next period by the Relationship Prediction of three-phase current and voltage
Number, control grid-connection converter operation.But when sensor breaks down, current signal missing will lead to control strategy failure,
So that grid-connection converter is unable to operate normally.For current sensor Problem of Failure, document: S.Bhowmik, A.van Zyl,
R.Spee,et al.Sensorless current control for active rectifiers[J].IEEE
Transactions on Industry Applications, 1997,33 (3): 765. propose alternating current calculates skill indirectly
Art extrapolates three-phase current by current relationship, participates in PWM control；Document Woo-Cheol Lee, Dong-Seok Hyun,
Taeck-Kie Lee,et al.A novel control method for three-phase PWM rectifiers
using a single current sensor[J].IEEE Transactions on Power Electronics,2000,
15 (5): 861. propose a kind of strategy using DC current reconstruct three-phase current, use DC side current sensor control three
Phase voltage source PWM rectifier, but need to change the mode of connection.
Summary of the invention
The technical problem to be solved by the present invention is to realize inverter switching device bridge arm failure and current sensor failure conditions
Under fault-tolerant operation, a kind of four switch converters model prediction fault tolerant control method of three-phase based on electric current reconstructing is provided, is not required to
Change the mode of connection and PWM modulation, there is good stable state and dynamic property.
The technical solution adopted by the present invention to solve the technical problems is:
The present invention provides a kind of four switch converters model prediction fault tolerant control method of three-phase based on electric current reconstructing, special
Sign is, includes the following steps,
S1: the A phase of the voltage sensor, current sensor periodically acquisition net side installed by net side with DC side exchanges
Voltage ea, B phase alternating voltage eb, C phase alternating voltage ec, DC side electric current idcWith DC voltage Vdc, faulted phase current ibn；
S2: failure being connected and is connected to DC capacitor midpoint, four construction of switch of three-phase is reconstructed, according to current switch states and electricity
Flow relation, by faulted phase current ibnWith DC side electric current idcA phase current i after calculating separately reconstructar, B phase current ibr, C phase electricity
Flow icr；
S3: for a variety of switch states of four construction of switch of three-phase, according to DC voltage VdcVoltage value obtains α and β and sits
Inverter output voltage V under mark systemα、Vβ,
According to A phase alternating voltage ea, B phase alternating voltage eb, C phase alternating voltage ecClark coordinate transform is carried out to obtain α
With the alternating voltage e under β coordinate systemαAnd eβ,
According to the A phase current i after reconstructar, B phase current ibr, C phase current icrClark coordinate transform is carried out to obtain α and β
Alternating current i under coordinate systemαAnd iβ；
S4: according to the calculated value of the active power at the current time under every kind of switch state, reactive power, the friendship of α and β phase
Galvanic electricity presses eαAnd eβ, the alternating current i of α and βαAnd iβAnd the inverter output voltage V of α and β phaseα、VβInput prediction functional expression
In obtain the active power of subsequent time, the numerical value of reactive power；
S5: successively the active power of every kind of switch state subsequent time be calculated, the numerical value of reactive power and have
Function power, reactive power reference value bring into cost function formula, obtain switch state corresponding to cost function minimum value, with
The switch state carries out faults-tolerant control to converter.
Further, the three-phase four switch converters model prediction fault tolerant control method of the invention based on electric current reconstructing,
In S2 and S3 step, four construction of switch of three-phase is sequentially connected DC power supply, first capacitor C1, the second capacitor C2, B Xiang Yu
The series connection point b connection of one capacitor C1 and the second capacitor C2, with bridge arm switch electricity on first capacitor C1, the second capacitor C2 and first
Bridge arm switching circuit, third lower bridge arm switching circuit are in parallel in road, the first lower bridge arm switching circuit and third, A Xiang Yu
Bridge arm switching circuit is connect with the series connection point a of the first lower bridge arm switching circuit on one, bridge arm switching circuit and the in C phase and third
The series connection point c connection of three lower bridge arm switching circuits；A variety of switch states are 4 kinds.
Further, the three-phase four switch converters model prediction fault tolerant control method of the invention based on electric current reconstructing, 4
Kind switch state is respectively as follows:
Switch state V1(0 0) reconstruct the first lower bridge arm switching circuit in four construction of switch of three-phase and open with third lower bridge arm
The conducting of powered-down road, bridge arm switching circuit cut-off in bridge arm switching circuit and third, DC side electric current i on firstdcIt is mutually electric with failure
Flow ibIt is equal, C phase current ic(k+1) the reconstruct electric current i at k moment is usedc(k), A phase current is-idc-ic；
Switch state V2(01), it reconstructs the first lower bridge arm switching circuit conducting in four construction of switch of three-phase and cooperates bridge in third
The conducting of arm switch circuit, A phase current are-idc, according to the faulted phase current i of samplingbnReconstructing C phase current is idc-ibn；
Switch state V3(10), it reconstructs bridge arm switching circuit conducting on first in four construction of switch of three-phase and cooperates bridge under third
The conducting of arm switch circuit, DC side electric current idcWith C phase current icOn the contrary, C phase current is-idc, according to the faulted phase current of sampling
ibnReconstructing A phase current is idc-ibn；
Switch state V4(11), bridge arm switching circuit on first in four construction of switch of three-phase is reconstructed to switch with bridge arm in third
Circuit conducting, the first lower bridge arm switching circuit and the cut-off of third lower bridge arm switching circuit, so DC side electric current idcIt is zero, sampling
Faulted phase current ibnElectric current i is reconstructed with the C phase k momentc(k) reconstructing A phase current is-ibn-ic。
Further, the three-phase four switch converters model prediction fault tolerant control method of the invention based on electric current reconstructing,
In S3 step,
Switch state V1When (0 0): Vα=-Vdc/6、
Switch state V2When (0 1): Vα=-Vdc/2、
Switch state V3When (1 0): Vα=Vdc/2、
Switch state V4When (1 1): Vα=Vdc/6,
5. the three-phase four switch converters model prediction according to claim 1-4 based on electric current reconstructing is held
Wrong control method, which is characterized in that in S5 step, the cost function formula are as follows: gi=| P*-P(k+1)|+|Q*- Q (k+1) |, formula
In: P (k+1), Q (k+1) they are respectively the active power of anticipation function, reactive power, P*And Q*Respectively given active power,
The reference value of reactive power.
The present invention also provides a kind of four switch converters model prediction fault tolerant control of three-phase based on electric current reconstructing, packet
It includes:
Data acquisition module: voltage sensor, current sensor for being installed by net side with DC side are periodically adopted
Collect the A phase alternating voltage e of net sidea, B phase alternating voltage eb, C phase alternating voltage ec, DC side electric current idcWith DC voltage Vdc,
Faulted phase current ibn；
Electric current reconstructing module: being connected to DC capacitor midpoint for failure to be connected, reconstruct four construction of switch of three-phase, according to working as
Preceding switch state and current relationship, by faulted phase current ibnWith DC side electric current idcA phase current i after calculating separately reconstructar、B
Phase current ibr, C phase current icr；
Coordinate transformation module: for a variety of switch states for four construction of switch of three-phase, according to DC voltage VdcElectricity
Pressure is worth to obtain the inverter output voltage V under α and β coordinate systemα、Vβ, according to A phase alternating voltage ea, B phase alternating voltage eb, C phase
Alternating voltage ecClark coordinate transform is carried out to obtain the alternating voltage e under α and β coordinate systemαAnd eβ, according to the A phase after reconstruct
Electric current iar, B phase current ibr, C phase current icrClark coordinate transform is carried out to obtain the alternating current i under α and β coordinate systemαWith
iβ；
Prediction module: for by the calculated value of the active power at the current time under every kind of switch state, reactive power, α
With the alternating voltage e of β phaseαAnd eβ, the alternating current i of α and β phaseαAnd iβAnd the DC voltage V of α and β phaseα、VβInput prediction
The active power of subsequent time, the numerical value of reactive power are obtained in functional expression；
Control module: for active power, the reactive power successively every kind of switch state subsequent time be calculated
Numerical value and active power, the reference value of reactive power bring into cost function formula, obtain corresponding to cost function minimum value
Switch state carries out faults-tolerant control to converter with the switch state.
Further, the three-phase four switch converters model prediction fault tolerant control method of the invention based on electric current reconstructing, electricity
It flows in reconstructed module and coordinate transformation module, four construction of switch of three-phase is sequentially connected DC power supply, first capacitor C1, second
Capacitor C2, B phase is connect with the series connection point b of first capacitor C1 and the second capacitor C2, with first capacitor C1, the second capacitor C2 and first
Bridge arm switching circuit, third lower bridge arm switching circuit phase in upper bridge arm switching circuit, the first lower bridge arm switching circuit and third
Parallel connection, A phase are connect with bridge arm switching circuit on first with the series connection point a of the first lower bridge arm switching circuit, bridge arm in C phase and third
Switching circuit is connect with the series connection point c of third lower bridge arm switching circuit；A variety of switch states are 4 kinds.
Further, the three-phase four switch converters model prediction fault tolerant control method of the invention based on electric current reconstructing, 4 kinds
Switch state is respectively as follows:
Switch state V1(0 0) reconstruct the first lower bridge arm switching circuit in four construction of switch of three-phase and open with third lower bridge arm
The conducting of powered-down road, bridge arm switching circuit cut-off in bridge arm switching circuit and third, DC side electric current i on firstdcIt is mutually electric with failure
Flow ibIt is equal, C phase current ic(k+1) the reconstruct electric current i at k moment is usedc(k), A phase current is-idc-ic；
Switch state V2(0 1) reconstruct in four construction of switch of three-phase in the first lower bridge arm switching circuit conducting cooperation third
The conducting of bridge arm switching circuit, A phase current are-idc, according to the faulted phase current i of samplingbnReconstructing C phase current is idc-ibn；
Switch state V3(1 0) reconstruct on first in four construction of switch of three-phase under bridge arm switching circuit conducting cooperation third
The conducting of bridge arm switching circuit, DC side electric current idcWith C phase current icOn the contrary, C phase current is-idc, mutually electric according to the failure of sampling
Flow ibnReconstructing A phase current is idc-ibn；
Switch state V4(1 1) reconstruct bridge arm switching circuit on first in four construction of switch of three-phase and open with bridge arm in third
Powered-down road conducting, the first lower bridge arm switching circuit and the cut-off of third lower bridge arm switching circuit, so DC side electric current idcIt is zero, adopts
Sample faulted phase current ibnElectric current i is reconstructed with the C phase k momentc(k) reconstructing A phase current is-ibn-ic。
Further, the three-phase four switch converters model prediction fault tolerant control method of the invention based on electric current reconstructing is sat
It marks in conversion module,
Switch state V1When (0 0): Vα=-Vdc/6、
Switch state V2When (0 1): Vα=-Vdc/2、
Switch state V3When (1 0): Vα=Vdc/2、
Switch state V4(11) when: Vα=Vdc/6、
Further, the three-phase four switch converters model prediction fault tolerant control method of the invention based on electric current reconstructing, control
In molding block, the cost function formula are as follows:
gi=| P*-P(k+1)|+|Q*- Q (k+1) |, in formula: P (k+1), Q (k+1) they are respectively the wattful power of anticipation function
Rate, reactive power, P*And Q*Respectively given active power, the reference value of reactive power.
The beneficial effects of the present invention are:
The application switchs fault-tolerant converter for three-phase four, proposes a kind of model prediction power control based on electric current reconstructing
Strategy.Fault-tolerant three-phase grid converter voltage status equation under two-phase static coordinate is established, power prediction expression formula has been obtained.
When bridge arm failure occurs for converter and ac sensor fails, using voltage vector and current relationship, three-phase current, ginseng are reconstructed
With the Model Predictive Control of fault-tolerant converter.Carry out stable state and dynamic emulation and experiment, the results showed that, proposed by the present invention
Based under electric current reconstructing model prediction power control, grid-connection converter can be realized switch bridge arm and current sensor twin failure
Under fault-tolerant continuous operation, and have good stable state and dynamic property.
Detailed description of the invention
The technical solution of the application is further illustrated with reference to the accompanying drawings and examples.
Fig. 1 is grid-connection converter fault-tolerant architecture；
Fig. 2 is reconstruct four construction of switch of three-phase；
Fig. 3 is that three-phase four switchs space vector under B phase fault；
Fig. 4 is four switch converters C phase failure of three-phase；
Fig. 5 a, Fig. 5 b, Fig. 5 c, Fig. 5 d are respectively the fault-tolerant architecture under four kinds of switch states；
Fig. 6 is the model prediction faults-tolerant control structure based on electric current reconstructing；
Fig. 7 a and 7b are respectively A phase and C phase current on line side and reconstruct electric current；
Fig. 8 a and 8b are respectively net side three-phase output electric current and three phase reconstruction electric currents；
Dynamic Simulation Results when Fig. 9 is B phase fault；
Figure 10 is that three-phase four switchs fault-tolerant converter experiment porch；
Figure 11 a and 11b are respectively A phase and C phase current on line side and reconstruct electric current；
Steady Experimental result when Figure 12 is B phase fault；
Dynamic experimental results when Figure 13 is B phase fault.
Specific embodiment
It should be noted that in the absence of conflict, the features in the embodiments and the embodiments of the present application can phase
Mutually combination.
It is described in detail the technical solution of the application below with reference to the accompanying drawings and in conjunction with the embodiments.
Embodiment
The present embodiment provides a kind of four switch converters model prediction fault tolerant control method of three-phase based on electric current reconstructing, packet
Include following steps:
S1: the A phase of the voltage sensor, current sensor periodically acquisition net side installed by net side with DC side exchanges
Voltage ea, B phase alternating voltage eb, C phase alternating voltage ec, DC side electric current idcWith DC voltage Vdc, faulted phase current ibn；
S2: failure being connected and is connected to DC capacitor midpoint, four construction of switch of three-phase is reconstructed, according to current switch states and electricity
Flow relation, by faulted phase current ibnWith DC side electric current idcA phase current i after calculating separately reconstructar, B phase current ibr, C phase electricity
Flow icr；
S3: for a variety of switch states of four construction of switch of three-phase, according to DC voltage VdcVoltage value obtains α and β and sits
Inverter output voltage V under mark systemα、Vβ,
According to A phase alternating voltage ea, B phase alternating voltage eb, C phase alternating voltage ecClark coordinate transform is carried out to obtain α
With the alternating voltage e of β coordinate systemαAnd eβ,
Transformation for mula are as follows:
According to the A phase current i after reconstructar, B phase current ibr, C phase current icrClark coordinate transform is carried out to obtain α and β
The alternating current i of coordinate systemαAnd iβ；
Transformation for mula are as follows:
Four kinds of switch states are respectively such as Fig. 5 a~5d.
Switch state V1(0 0) reconstruct the first lower bridge arm switching circuit in four construction of switch of three-phase and open with third lower bridge arm
The conducting of powered-down road, bridge arm switching circuit cut-off in bridge arm switching circuit and third, DC side electric current i on firstdcIt is mutually electric with failure
Flow ibIt is equal, C phase current ic(k+1) the reconstruct electric current i at k moment is usedc(k), A phase current is-idc-ic；
Switch state V2(0 1) reconstruct in four construction of switch of three-phase in the first lower bridge arm switching circuit conducting cooperation third
The conducting of bridge arm switching circuit, A phase current are-idc, according to the faulted phase current i of samplingbnReconstructing C phase current is idc-ibn；
Switch state V3(1 0) reconstruct on first in four construction of switch of three-phase under bridge arm switching circuit conducting cooperation third
The conducting of bridge arm switching circuit, DC side electric current idcWith C phase current icOn the contrary, C phase current is-idc, mutually electric according to the failure of sampling
Flow ibnReconstructing A phase current is idc-ibn；
Switch state V4(1 1) reconstruct bridge arm switching circuit on first in four construction of switch of three-phase and open with bridge arm in third
Powered-down road conducting, the first lower bridge arm switching circuit and the cut-off of third lower bridge arm switching circuit, so DC side electric current idcIt is zero, adopts
Sample faulted phase current ibnElectric current i is reconstructed with the C phase k momentc(k) reconstructing A phase current is-ibn-ic。
Three-phase current i after table reconstructar、ibr、icrCalculation formula are as follows:
The transformation results of four switching voltage of table three-phase:
S4: according to the calculated value of the active power at the current time under every kind of switch state, reactive power, the friendship of α and β phase
Galvanic electricity presses eαAnd eβ, the alternating current i of α and βαAnd iβAnd the inverter output voltage V of α and β phaseα、VβInput prediction functional expression
In obtain the active power of subsequent time, the numerical value of reactive power；
The anticipation function formula are as follows:
P (k), Q in formula
(k) active power at current time, the calculated value of reactive power, T are indicatedsIndicate the sampling period, L is filter inductance value, and R is indicated
The resistance value of route, iα(k)、iβ(k)、eα(k)、eβIt (k) is the alternating current and voltage on line side of α the and β phase at current time, Vα
(k)、VβIt (k) is the alternating voltage of the α and β phase at current time；
S5: successively the active power of every kind of switch state subsequent time be calculated, the numerical value of reactive power and have
Function power, reactive power reference value bring into cost function formula, obtain switch state corresponding to cost function minimum value, with
The switch state carries out faults-tolerant control to converter；
Cost function formula are as follows: gi=| P*-P(k+1)|+|Q*- Q (k+1) |, in formula: P (k+1), Q (k+1) they are respectively to predict
Active power, the reactive power of function, P*And Q*Respectively given active power, the reference value of reactive power.
There is conventional electric power electronics grid-connection converter three-phase six to switch (TPSS) structure, consider switching device in rush of current
Or will appear failure under peak voltage, to maintain the fault-tolerant operation under bridge arm failure, the application establishes that grid-connection converter is fault-tolerant to open up
Flutter structure such as Fig. 1.
Six construction of switch of three-phase is sequentially connected DC power supply, in first capacitor C1, the second capacitor C2, A phase and first
Bridge arm switching circuit is connect with the series connection point a of the first lower bridge arm switching circuit, in B phase and second under bridge arm switching circuit and second
The series connection point of bridge arm switching circuit and third lower bridge arm switching circuit in the series connection point b connection of bridge arm switching circuit, C phase and third
C connection.
Three-phase outlet line is connected to DC bus capacitor midpoint, each bridge arm serial fuse F by control switch.When certain
When phase switching device breaks down, fuse disconnection respective branch, control switch connection failure phase to DC capacitor side midpoint, by
Capacitance voltage constitutes virtual bridge arm, maintains operation.Assuming that under grid-connection converter B phase bridge arm switching circuit status fault, reconstruct
Three-phase four switchs (TPFS) structure such as Fig. 2, and B phase, which exports, is connected to DC capacitor midpoint, and the bridge arm by controlling residue A, C phase is opened
Powered-down line state carries out faults-tolerant control to converter.
For the fault-tolerant architecture of grid-connection converter, when B phase switchs bridge arm failure, according to TPFS structure such as Fig. 2 of reconstruct,
A, the switch state signal S of C two-phasei(i=a, c) control is as follows:
A, C two-phase switch has (0 0), (0 1), (1 0), (1 1) four kinds of switch states, and B phase bridge arm passes through control switch
It is connected to DC capacitor side midpoint, obtains the relationship of grid-connection converter phase voltage and switch state.
It is as follows that the switch expression formula of three-phase four can be obtained by the TPFS structure and Kirchhoff's second law of Fig. 2:
I in formulam、Vmn、emRespectively m phase current, phase voltage and network voltage, L, R indicate filter inductance and line resistance.
The state equation under α, β two-phase static coordinate is obtained by coordinate transform:
Formula (2) discretization is obtained into the current expression of next sampling instant:
Ts indicates the sampling period in formula.
According to instantaneous power theory, active power, reactive power:
Formula (3) brought into above formula (4) is inner, subsequent time prediction power is calculated using the last moment performance number of sampling
It is worth as follows:
The present embodiment also provides a kind of four switch converters model prediction fault tolerant control of three-phase based on electric current reconstructing,
Include:
Data acquisition module: voltage sensor, current sensor for being installed by net side with DC side are periodically adopted
Collect the A phase alternating voltage e of net sidea, B phase alternating voltage eb, C phase alternating voltage ec, DC side electric current idcWith DC voltage Vdc,
Faulted phase current ibn；
Electric current reconstructing module: being connected to DC capacitor midpoint for failure to be connected, reconstruct four construction of switch of three-phase, according to working as
Preceding switch state and current relationship, by faulted phase current ibnWith DC side electric current idcA phase current i after calculating separately reconstructar、B
Phase current ibr, C phase current icr；
Coordinate transformation module: for a variety of switch states for four construction of switch of three-phase, according to DC voltage VdcElectricity
Pressure is worth to obtain the inverter output voltage V under α and β coordinate systemα、Vβ, according to A phase alternating voltage ea, B phase alternating voltage eb, C phase
Alternating voltage ecClark coordinate transform is carried out to obtain the alternating voltage e under α and β coordinate systemαAnd eβ, according to the A phase after reconstruct
Electric current iar, B phase current ibr, C phase current icrClark coordinate transform is carried out to obtain the alternating current i under α and β coordinate systemαWith
iβ；
Prediction module: for by the calculated value of the active power at the current time under every kind of switch state, reactive power, α
With the alternating voltage e of β coordinate systemαAnd eβ, the alternating current i of α and β phaseαAnd iβAnd the DC voltage V of α and β phaseα、VβInput
The active power of subsequent time, the numerical value of reactive power are obtained in anticipation function formula；
Control module: for active power, the reactive power successively every kind of switch state subsequent time be calculated
Numerical value and active power, the reference value of reactive power bring into cost function formula, obtain corresponding to cost function minimum value
Switch state carries out faults-tolerant control to converter with the switch state.
Four construction of switch of three-phase is sequentially connected DC power supply, first capacitor C1, the second capacitor C2, B phase and the first electricity
The series connection point b connection for holding C1 and the second capacitor C2, with bridge arm switching circuit on first capacitor C1, the second capacitor C2 and first, the
Bridge arm switching circuit, third lower bridge arm switching circuit are in parallel on one lower bridge arm switching circuit and third, bridge in A phase and first
Arm switch circuit is connect with the series connection point a of the first lower bridge arm switching circuit, bridge arm switching circuit and bridge under third in C phase and third
The series connection point c connection of arm switch circuit, a variety of switch states are 4 kinds.
4 kinds of switch states are respectively as follows:
Switch state V1(00), the first lower bridge arm switching circuit and third lower bridge arm in four construction of switch of three-phase is reconstructed to switch
Circuit conducting, bridge arm switching circuit cut-off in bridge arm switching circuit and third, DC side electric current i on firstdcAnd faulted phase current
ibIt is equal, C phase current ic(k+1) the reconstruct electric current i at k moment is usedc(k), A phase current is-idc-ic；
Switch state V2(0 1) reconstruct in four construction of switch of three-phase in the first lower bridge arm switching circuit conducting cooperation third
The conducting of bridge arm switching circuit, A phase current are-idc, according to the faulted phase current i of samplingbnReconstructing C phase current is idc-ibn；
Switch state V3(1 0) reconstruct on first in four construction of switch of three-phase under bridge arm switching circuit conducting cooperation third
The conducting of bridge arm switching circuit, DC side electric current idcWith C phase current icOn the contrary, C phase current is-idc, mutually electric according to the failure of sampling
Flow ibnReconstructing A phase current is idc-ibn；
Switch state V4(1 1) reconstruct bridge arm switching circuit on first in four construction of switch of three-phase and open with bridge arm in third
Powered-down road conducting, the first lower bridge arm switching circuit and the cut-off of third lower bridge arm switching circuit, so DC side electric current idcIt is zero, adopts
Sample faulted phase current ibnElectric current i is reconstructed with the C phase k momentc(k) reconstructing A phase current is-ibn-ic。
In coordinate transformation module,
Switch state V1When (0 0): Vα=-Vdc/6、
Switch state V2When (0 1): Vα=-Vdc/2,
Switch state V3When (1 0): Vα=Vdc/2、
Switch state V4When (1 1): Vα=Vdc/6、
In control module, the cost function formula are as follows: gi=| P*-P(k+1)|+|Q*- Q (k+1) |, in formula: P (k+1), Q
(k+1) be respectively anticipation function active power, reactive power, P*And Q*Respectively given active power, the ginseng of reactive power
Examine value.
Effect experimental examples
The validity based on the fault-tolerant converter of electric current reconstructing Model Predictive Control is proposed in order to verify, in MATLAB/
It is emulated under Simulink environment, system parameter is as shown in the table.
Table emulation and experiment parameter
Static Simulation
Fig. 7 a and Fig. 7 b are converter in the case where B phase fault, give power Pref=1kW, Qref=0Var, reconstruct electricity
Flow iar、icrElectric current i is exported with grid sidea、icAnd its difference wa、wcSimulation waveform.The wherein i in Fig. 7 aaIt is A phase outlet side
Electric current, iarIt is the A phase reconstruction electric current obtained by restructing algorithm, it can be seen from the figure that A phase current reconstruction works well,
It is essentially coincided with actual current, reconstruct electric current and the difference w for exporting electric currentaAmplitude is no more than 0.3A, reconstructs electric current iarClose to ia,
C phase reconstruction electric current i in Fig. 7 bcrWith actual current icIt essentially coincides, error wcAmplitude is lower than 0.5A.
Fig. 8 a and Fig. 8 b are converter in the case where B phase fault, give power Pref=1kW, QrefThe stable state of=0Var
Simulation waveform, wherein Fig. 8 a is fault-tolerant converter grid side output electric current ia、ib、icSimulation waveform, Fig. 8 b is fault-tolerant converter
Three phase reconstruction electric current iar、ibr、icrSimulation waveform, the results showed that, grid-connected current quality reconstruction is good, and electric current THD is
1.94%.Electric current is reconstructed compared with exporting electric current, THD slightly rises, and electric current THD is 2.04%, reconstructs the control effect of electric current
Well.
Dynamic simulation
For the dynamic property for verifying fault-tolerant converter, as shown in figure 9, given initial power Pref=1200W, Qref=
Change given active-power P when 0Var, 0.5sref=800W.Work as PrefWhen=1200W, grid-connected current waveform is good, and THD is
Active-power P when 1.6%, 0.5srefIt jumps to 800W, electric current fast and stable, THD 2.4%.Output power variation is steady.It is imitative
Very the result shows that, grid-connection converter dynamic property is good, demonstrates the validity of control strategy.
Effect experiment verifying
In order to verify the validity based on the fault-tolerant converter of electric current reconstructing Model Predictive Control of proposition, a set of three have been built
Phase grid-connection converter experiment porch, experimental facilities specifically include that adjustable DC power supply APL-II, Programmable AC Power Source AMETEK
MX-30 and the converter hardware test platform controlled by TMS320F28335, as shown in Figure 10.Shown in experiment parameter table 3 as above.
Steady Experimental
In B phase fault, Figure 11 a and Figure 11 b are provided based on the fault-tolerant grid-connection converter model prediction control of electric current reconstructing
The lower electric current reconstructed of system and power grid export the relationship of electric current, the i in Figure 11 aaIt is the electric current of A phase outlet side, iarIt is to pass through reconstruct
The A phase reconstruction electric current that algorithm obtains shows that A phase current reconstruction works well in figure, and reconstruct electric current and sample rate current weigh substantially
It closes, reconstructs electric current iarClose to ia.C phase reconstruction electric current i in Figure 11 bcrClose to grid-connected current ic, reconstruct electric current and actual output current
Error is smaller, shows to reconstruct electric current close to actual current, demonstrates the validity of electric current reconstructing method.
Given active-power Pref=1kW, reactive power QrefWhen=0Var, fault-tolerant converter is in steady operation situation,
Three-phase grid electric current and output power experimental waveform are as shown in figure 12.Grid side exports electric current i in figurea、ib、icSine degree is good,
Electric current THD is 3.5%, meets grid-connected requirement, stable output power can guarantee the continuous operation of system under fault-tolerant state, test
The good steady state effect based on electric current reconstructing model prediction method proposed is demonstrate,proved.
Dynamic experiment
In order to further verify the dynamic property of the proposed method of the present invention, following dynamic experiment is carried out.Changing its reference has
Function power gives initial power Pref=1200W, Qref=0Var, jump to active-power Pref=800W.PrefWhen=1200W,
Experimental waveform is as shown in figure 13.Three-phase grid current sinusoidal degree is good, and no impact and Severe distortion, THD are risen to by 2.9%
6.4%, active power and the quick track reference value of reactive power.The experimental results showed that fault-tolerant converter dynamic property is good, into
One step demonstrates the validity of control strategy.
The application switchs fault-tolerant converter for three-phase four, proposes a kind of model prediction power control based on electric current reconstructing
Strategy.Fault-tolerant three-phase grid converter voltage status equation under α β two-phase static coordinate is established, power prediction expression has been obtained
Formula.When bridge arm failure occurs for converter and ac sensor fails, using voltage vector and current relationship, three-phase electricity is reconstructed
Stream, participates in the Model Predictive Control of fault-tolerant converter.Carry out stable state and dynamic emulation and experiment, the results showed that, in the present invention
It is proposed based under electric current reconstructing model prediction power control, grid-connection converter can be realized switch bridge arm and current sensor is double
Fault-tolerant continuous operation under weight failure, and there is good stable state and dynamic property.
It is enlightenment with the above-mentioned desirable embodiment according to the application, through the above description, relevant staff is complete
Full various changes and amendments can be carried out in the range of without departing from this item application technical idea.The technology of this item application
Property range is not limited to the contents of the specification, it is necessary to which the technical scope thereof is determined according to the scope of the claim.
It should be understood by those skilled in the art that, embodiments herein can provide as method, system or computer program
Product.Therefore, complete hardware embodiment, complete software embodiment or reality combining software and hardware aspects can be used in the application
Apply the form of example.Moreover, it wherein includes the computer of computer usable program code that the application, which can be used in one or more,
The computer program implemented in usable storage medium (including but not limited to magnetic disk storage, CD-ROM, optical memory etc.) produces
The form of product.
The application is referring to method, the process of equipment (system) and computer program product according to the embodiment of the present application
Figure and/or block diagram describe.It should be understood that every one stream in flowchart and/or the block diagram can be realized by computer program instructions
The combination of process and/or box in journey and/or box and flowchart and/or the block diagram.It can provide these computer programs
Instruct the processor of general purpose computer, special purpose computer, Embedded Processor or other programmable data processing devices to produce
A raw machine, so that being generated by the instruction that computer or the processor of other programmable data processing devices execute for real
The device for the function of being specified in present one or more flows of the flowchart and/or one or more blocks of the block diagram.
These computer program instructions, which may also be stored in, is able to guide computer or other programmable data processing devices with spy
Determine in the computer-readable memory that mode works, so that it includes referring to that instruction stored in the computer readable memory, which generates,
Enable the manufacture of device, the command device realize in one box of one or more flows of the flowchart and/or block diagram or
The function of being specified in multiple boxes.
These computer program instructions also can be loaded onto a computer or other programmable data processing device, so that counting
Series of operation steps are executed on calculation machine or other programmable devices to generate computer implemented processing, thus in computer or
The instruction executed on other programmable devices is provided for realizing in one or more flows of the flowchart and/or block diagram one
The step of function of being specified in a box or multiple boxes.
Claims (10)
1. a kind of four switch converters model prediction fault tolerant control method of three-phase based on electric current reconstructing, which is characterized in that including
Following steps,
S1: the A phase alternating voltage of the voltage sensor, current sensor periodically acquisition net side installed by net side with DC side
ea, B phase alternating voltage eb, C phase alternating voltage ec, DC side electric current idcWith DC voltage Vdc, faulted phase current ibn；
S2: failure being connected and is connected to DC capacitor midpoint, reconstructs four construction of switch of three-phase, is closed according to current switch states and electric current
System, by faulted phase current ibnWith DC side electric current idcA phase current i after calculating separately reconstructar, B phase current ibr, C phase current
icr；
S3: for a variety of switch states of four construction of switch of three-phase, according to DC voltage VdcVoltage value obtains α and β coordinate system
Under inverter output voltage Vα、Vβ,
According to A phase alternating voltage ea, B phase alternating voltage eb, C phase alternating voltage ecIt carries out Clark coordinate transform and is sat with obtaining α and β
Alternating voltage e under mark systemαAnd eβ,
According to the A phase current i after reconstructar, B phase current ibr, C phase current icrClark coordinate transform is carried out to obtain α and β coordinate
Alternating current i under systemαAnd iβ；
S4: according to the calculated value of the active power at the current time under every kind of switch state, reactive power, the alternating current of α and β phase
Press eαAnd eβ, the alternating current i of α and β phaseαAnd iβAnd the inverter output voltage V of α and β phaseα、VβIn input prediction functional expression
Obtain the active power of subsequent time, the numerical value of reactive power；
S5: successively the active power of every kind of switch state subsequent time be calculated, the numerical value of reactive power and wattful power
Rate, the reference value of reactive power are brought into cost function formula, are obtained switch state corresponding to cost function minimum value, are opened with this
Off status carries out faults-tolerant control to converter.
2. the three-phase four switch converters model prediction fault tolerant control method according to claim 1 based on electric current reconstructing,
It is characterized in that, four construction of switch of three-phase is sequentially connected DC power supply, first capacitor C1, the second electricity in S2 and S3 step
Hold C2, B phase is connect with the series connection point b of first capacitor C1 and the second capacitor C2, on first capacitor C1, the second capacitor C2 and first
Bridge arm switching circuit in bridge arm switching circuit, the first lower bridge arm switching circuit and third, third lower bridge arm switching circuit are mutually simultaneously
Connection, A phase are connect with bridge arm switching circuit on first with the series connection point a of the first lower bridge arm switching circuit, and C phase is opened with bridge arm in third
Powered-down road is connect with the series connection point c of third lower bridge arm switching circuit；A variety of switch states are 4 kinds.
3. the three-phase four switch converters model prediction fault tolerant control method according to claim 2 based on electric current reconstructing,
It is characterized in that, 4 kinds of switch states are respectively as follows:
Switch state V1(0 0) reconstruct the first lower bridge arm switching circuit and third lower bridge arm switching circuit in four construction of switch of three-phase
Conducting, bridge arm switching circuit cut-off in bridge arm switching circuit and third, DC side electric current i on firstdcWith faulted phase current ibPhase
Deng C phase current ic(k+1) the reconstruct electric current i at k moment is usedc(k), A phase current is-idc-ic；
Switch state V2(0 1) reconstruct the first lower bridge arm switching circuit conducting in four construction of switch of three-phase and bridge arm in third are cooperated to open
Powered-down road conducting, A phase current are-idc, according to the faulted phase current i of samplingbnReconstructing C phase current is idc-ibn；
Switch state V3(10), bridge arm switching circuit conducting cooperation third lower bridge arm on first in four construction of switch of three-phase is reconstructed to open
Powered-down road conducting, DC side electric current idcWith C phase current icOn the contrary, C phase current is-idc, according to the faulted phase current i of samplingbnWeight
It is i that structure, which goes out A phase current,dc-ibn；
Switch state V4(11), bridge arm switching circuit and bridge arm switching circuit in third on first in four construction of switch of three-phase are reconstructed
Conducting, the first lower bridge arm switching circuit and the cut-off of third lower bridge arm switching circuit, so DC side electric current idcIt is zero, samples failure
Phase current ibnElectric current i is reconstructed with the C phase k momentc(k) reconstructing A phase current is-ibn-ic。
4. the three-phase four switch converters model prediction fault tolerant control method according to claim 3 based on electric current reconstructing,
It is characterized in that, in S3 step,
Switch state V1When (0 0):
Switch state V2When (0 1):
Switch state V3When (1 0):
Switch state V4When (1 1):
5. the three-phase four fault-tolerant control of switch converters model prediction according to claim 1-4 based on electric current reconstructing
Method processed, which is characterized in that in S5 step, the cost function formula are as follows: gi=| P*-P(k+1)|+|Q*- Q (k+1) |, in formula: P
(k+1), Q (k+1) is respectively the active power of anticipation function, reactive power, P*And Q*It is respectively given active power, idle
The reference value of power.
6. a kind of four switch converters model prediction fault tolerant control of three-phase based on electric current reconstructing characterized by comprising
Data acquisition module: for passing through net side and the voltage sensor of DC side installation, current sensor periodically acquisition net
The A phase alternating voltage e of sidea, B phase alternating voltage eb, C phase alternating voltage ec, DC side electric current idcWith DC voltage Vdc, failure
Phase current ibn；
Electric current reconstructing module: being connected to DC capacitor midpoint for failure to be connected, reconstruct four construction of switch of three-phase, according to currently opening
Off status and current relationship, by faulted phase current ibnWith DC side electric current idcA phase current i after calculating separately reconstructar, B phase electricity
Flow ibr, C phase current icr；
Coordinate transformation module: for a variety of switch states for four construction of switch of three-phase, according to DC voltage VdcVoltage value
Obtain the inverter output voltage V under α and β coordinate systemα、Vβ, according to A phase alternating voltage ea, B phase alternating voltage eb, C phase exchanges
Voltage ecClark coordinate transform is carried out to obtain the alternating voltage e under α and β coordinate systemαAnd eβ, according to the A phase current after reconstruct
iar, B phase current ibr, C phase current icrClark coordinate transform is carried out to obtain the alternating current i under α and β coordinate systemαAnd iβ；
Prediction module: for by the calculated value of the active power at the current time under every kind of switch state, reactive power, α and β phase
Alternating voltage eαAnd eβ, the alternating current i of α and β phaseαAnd iβAnd the DC voltage V of α and β phaseα、VβInput prediction function
The active power of subsequent time, the numerical value of reactive power are obtained in formula；
Control module: for successively the number of the active power of every kind of switch state subsequent time be calculated, reactive power
Value and active power, the reference value of reactive power are brought into cost function formula, and switch corresponding to cost function minimum value is obtained
State carries out faults-tolerant control to converter with the switch state.
7. the three-phase four switch converters model prediction fault tolerant control method according to claim 6 based on electric current reconstructing,
It is characterized in that, in electric current reconstructing module and coordinate transformation module, four construction of switch of three-phase is sequentially connected DC power supply, the
One capacitor C1, the second capacitor C2, B phase are connect with the series connection point b of first capacitor C1 and the second capacitor C2, with first capacitor C1,
On two capacitor C2 and first in bridge arm switching circuit, the first lower bridge arm switching circuit and third under bridge arm switching circuit, third
Bridge arm switching circuit is in parallel, and A phase is connect with bridge arm switching circuit on first with the series connection point a of the first lower bridge arm switching circuit, C
Mutually it is connect with bridge arm switching circuit in third with the series connection point c of third lower bridge arm switching circuit；A variety of switch states are 4 kinds.
8. the three-phase four switch converters model prediction fault tolerant control method according to claim 7 based on electric current reconstructing,
It is characterized in that, 4 kinds of switch states are respectively as follows:
Switch state V1(0 0) reconstruct the first lower bridge arm switching circuit and third lower bridge arm switching circuit in four construction of switch of three-phase
Conducting, bridge arm switching circuit cut-off in bridge arm switching circuit and third, DC side electric current i on firstdcWith faulted phase current ibPhase
Deng C phase current ic(k+1) the reconstruct electric current i at k moment is usedc(k), A phase current is-idc-ic；
Switch state V2(0 1) reconstruct the first lower bridge arm switching circuit conducting in four construction of switch of three-phase and bridge arm in third are cooperated to open
Powered-down road conducting, A phase current are-idc, according to the faulted phase current i of samplingbnReconstructing C phase current is idc-ibn；
Switch state V3(1 0) reconstruct bridge arm switching circuit conducting cooperation third lower bridge arm on first in four construction of switch of three-phase and open
Powered-down road conducting, DC side electric current idcWith C phase current icOn the contrary, C phase current is-idc, according to the faulted phase current i of samplingbnWeight
It is i that structure, which goes out A phase current,dc-ibn；
Switch state V4(1 1) reconstruct bridge arm switching circuit and bridge arm switching circuit in third on first in four construction of switch of three-phase
Conducting, the first lower bridge arm switching circuit and the cut-off of third lower bridge arm switching circuit, so DC side electric current idcIt is zero, samples failure
Phase current ibnElectric current i is reconstructed with the C phase k momentc(k) reconstructing A phase current is-ibn-ic。
9. the three-phase four switch converters model prediction fault tolerant control method according to claim 8 based on electric current reconstructing,
It is characterized in that, in coordinate transformation module,
Switch state V1When (0 0):
Switch state V2When (0 1):
Switch state V3When (1 0):
Switch state V4When (1 1):
10. fault-tolerant according to the described in any item four switch converters model predictions of three-phase based on electric current reconstructing of claim 6-7
Control method, which is characterized in that in control module, the cost function formula are as follows: gi=| P*-P(k+1)|+|Q*- Q (k+1) |, formula
In: P (k+1), Q (k+1) they are respectively the active power of anticipation function, reactive power, P*And Q*Respectively given active power,
The reference value of reactive power.
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