CN110401346A - Tandem type multiphase interleaving Boost control method - Google Patents
Tandem type multiphase interleaving Boost control method Download PDFInfo
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- CN110401346A CN110401346A CN201910675907.0A CN201910675907A CN110401346A CN 110401346 A CN110401346 A CN 110401346A CN 201910675907 A CN201910675907 A CN 201910675907A CN 110401346 A CN110401346 A CN 110401346A
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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
- H02M3/00—Conversion of dc power input into dc power output
- H02M3/02—Conversion of dc power input into dc power output without intermediate conversion into ac
- H02M3/04—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters
- H02M3/10—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode
- H02M3/145—Conversion of dc power input into dc power output without intermediate conversion into ac 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
- H02M3/155—Conversion of dc power input into dc power output without intermediate conversion into ac 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
- H02M3/156—Conversion of dc power input into dc power output without intermediate conversion into ac 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 with automatic control of output voltage or current, e.g. switching regulators
- H02M3/158—Conversion of dc power input into dc power output without intermediate conversion into ac 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 with automatic control of output voltage or current, e.g. switching regulators including plural semiconductor devices as final control devices for a single load
- H02M3/1584—Conversion of dc power input into dc power output without intermediate conversion into ac 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 with automatic control of output voltage or current, e.g. switching regulators including plural semiconductor devices as final control devices for a single load with a plurality of power processing stages connected in parallel
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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
- H02P27/06—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 using dc to ac converters or inverters
-
- 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
- H02M3/00—Conversion of dc power input into dc power output
- H02M3/02—Conversion of dc power input into dc power output without intermediate conversion into ac
- H02M3/04—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters
- H02M3/10—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode
- H02M3/145—Conversion of dc power input into dc power output without intermediate conversion into ac 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
- H02M3/155—Conversion of dc power input into dc power output without intermediate conversion into ac 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
- H02M3/156—Conversion of dc power input into dc power output without intermediate conversion into ac 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 with automatic control of output voltage or current, e.g. switching regulators
- H02M3/158—Conversion of dc power input into dc power output without intermediate conversion into ac 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 with automatic control of output voltage or current, e.g. switching regulators including plural semiconductor devices as final control devices for a single load
- H02M3/1584—Conversion of dc power input into dc power output without intermediate conversion into ac 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 with automatic control of output voltage or current, e.g. switching regulators including plural semiconductor devices as final control devices for a single load with a plurality of power processing stages connected in parallel
- H02M3/1586—Conversion of dc power input into dc power output without intermediate conversion into ac 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 with automatic control of output voltage or current, e.g. switching regulators including plural semiconductor devices as final control devices for a single load with a plurality of power processing stages connected in parallel switched with a phase shift, i.e. interleaved
Abstract
The invention discloses a kind of tandem type multiphase interleaving Boost control methods, comprising: by ignoring output capacitance and input inductance parasitic resistance reconstituted state variable；Establish the small signal mathematical model of the three-phase crisscross parallel Boost of cascade system；The corresponding high-tension battery output electric current of load current is conversed by power conservation law and the current value feedovers to the output end of outer voltage；Deviation between Boost boosting reference value and the actual value of Boost output voltage is feedovered to the input terminal of outer voltage.It is applied widely, it is high-efficient.
Description
Technical field
The present invention relates to two-way DC converter sharing control technical fields, interlock more particularly to a kind of tandem type multiphase
Boost control method in parallel.
Background technique
Many advantages, such as permanent magnet synchronous motor is small in size, power density and torque density are big due to its, has been widely applied
In electric car field.In traditional preposition three-phase crisscross parallel Boost of inverter direct-flow side, busbar voltage can be improved
The flexibility of selection reduces the pulsation of permanent magnet synchronous motor low speed torque, improves drive system control efficiency.But in preposition Boost
In tandem type electric driving control system after converter, when acute variation occurs for load current, if Boost control system
System cannot timely respond to, and will lead to busbar voltage and generate larger fluctuation, influence the safety and performance of entire drive system.Cause
This, inhibits the research of the Boost control strategy of busbar voltage fluctuation to be of great significance in new drive system.
2. double-closed-loop control and power that current single phase boost converter generallys use inner ring electric current loop, outer ring Voltage loop
Feedover the control strategy that combines, multiphase Boost only with inner ring electric current loop and outer ring Voltage loop double-closed-loop control
Strategy.
Single phase boost converter generallys use inner ring electric current loop, the double-closed-loop control of outer ring Voltage loop and power feedforward phase
In conjunction with control strategy, though the fluctuation of busbar voltage can be inhibited to a certain extent, its design and analytic process is only applicable to
Single phase boost converter, is not suitable for multiphase Boost and its topological structure flexibility and inverter power grade are equal
Lower than multiphase Boost.Motor load is often considered as constant electricity during the Control System Design of multiphase Boost
Resistance, controls it, when load current changes, busbar voltage fluctuation is larger only with the form of two close cycles.
Summary of the invention
In order to solve above-mentioned technical problem, the present invention provides a kind of tandem type multiphase interleaving Boost changes
Parallel operation control method is reconstructed by state variable under the premise of ignoring output capacitance and input inductance parasitic resistance, establishes and be suitble to
It is inclined based on load current and busbar voltage in the small signal mathematical model of the three-phase crisscross parallel Boost of cascade system
The double-loop control strategy of difference feedforward.
The technical scheme is that
A kind of tandem type multiphase interleaving Boost control method, comprising the following steps:
S01: by ignoring output capacitance and inputting the state variable of inductance parasitic resistance reconfiguration system state equation；
S02: the small signal mathematical model of the three-phase crisscross parallel Boost of cascade system is established；
S03: the corresponding high-tension battery of load current is conversed by power conservation law and exports electric current and by the current value
It feedovers to the output end of outer voltage；Before the deviation that Boost is boosted between reference value and the actual value of Boost output voltage
It is fed to the input terminal of outer voltage.
In preferred technical solution, reconfiguration system state equation includes: in the step S01
Establish the voltage status equation in m phase circuit are as follows:
Wherein, L is each phase inductance value,For the State space averaging value of cell voltage, D ' is the steady of upper bridge arm duty ratio
State value,For the State space averaging value of converter output voltage, dm' for the State space averaging of bridge arm duty ratio in m phase
Value,For the State space averaging value of m phase inductance electric current.
Establish high-pressure side capacitance cathode node state equation are as follows:
Wherein D ' is the steady-state value of upper bridge arm duty ratio；ILFor the sum of certain moment three pole reactor electric current iLSteady-state value,
For load current mean value.
In preferred technical solution, the step S02 specific steps include:
Each state variable of the voltage status equation and high-pressure side capacitance cathode node state equation is decomposed into direct current
The sum of component and small sample perturbations, it may be assumed that
Wherein, V, Vg、D、IloadRespectivelydm、Steady-state value； Point
It is notdm、Disturbed value.
It brings (11) formula into (9) formula, (10) formula respectively, eliminate DC component and quadratic term component and La Pula is carried out to it
This transformation, obtains the small-signal model of the phase are as follows:
In preferred technical solution, after obtaining the small-signal model of the phase, ignore cell voltage disturbance and to (12) formula,
(13) formula is arranged, and can be obtained:
Obtain system transter, comprising:
In preferred technical solution, the output of outer voltage PI is the instruction value of inductive current, electric current in the step S03
The output of inner ring PI is duty ratio, carries out low-pass filtering to voltage deviation by second-order low-pass filter, is filtered by step low-pass
Wave device carries out low-pass filtering to load current.
Compared with prior art, the invention has the advantages that
1, this programme has studied the grade of the preposition three-phase crisscross parallel Boost of permanent magnet synchronous motor inverter direct-flow side
Connection unites and proposes more reasonable three-phase crisscross parallel Boost small-signal model method for building up for the cascade system.
2, the mentioned modeling method of this programme is not only suitable for tandem type three-phase crisscross parallel Boost, equally also fits
It is applied widely together in any staggered Boost in parallel of tandem type.
3, this programme is only needed through algorithm means in implementation process, it can be achieved that busbar voltage caused by load variation
The inhibition of fluctuation, without adding any circuit, save the cost.
Detailed description of the invention
The invention will be further described with reference to the accompanying drawings and embodiments:
Fig. 1 is the PMSM Drive System topological diagram of the preposition three-phase crisscross parallel Boost of the present invention；
Fig. 2 is three-phase crisscross parallel Boost sharing control model schematic.
Specific embodiment
In order to make the objectives, technical solutions and advantages of the present invention clearer, With reference to embodiment and join
According to attached drawing, the present invention is described in more detail.It should be understood that these descriptions are merely illustrative, and it is not intended to limit this hair
Bright range.In addition, in the following description, descriptions of well-known structures and technologies are omitted, to avoid this is unnecessarily obscured
The concept of invention.
Embodiment:
With reference to the accompanying drawing, presently preferred embodiments of the present invention is described further.
This programme sets the PMSM Drive System topological structure of three-phase crisscross parallel Boost such as in advance
Shown in Fig. 1, including high-tension battery, DC/DC converter, motor inverter and PMSM, DC/DC converter Boost
Part includes three-phase filter inductance and three-phase bridge power cell, the same phase IGBT (insulated gate bipolar of three-phase bridge power cell
Transistor npn npn) bridge arm complementation conducting above and below, adjacent 120 degree of two-phase IGBT phase shift conductings.Three pole reactor electric current is respectively iL1、
iL2、iL3, cell voltage Vg, load current iload。
This programme is reconstructed under the premise of ignoring output capacitance and input inductance parasitic resistance by state variable, is established and is suitble to
In the small signal mathematical model of the three-phase crisscross parallel Boost of cascade system, load current fluctuations are analyzed to bus
The influence of voltage stability simultaneously proposes the double-loop control strategy based on load current and the feedforward of busbar voltage deviation.
Firstly, defining the two-valued function switch function of n-th IGBT turn-on and turn-off:
By Kirchhoff's second law, the voltage equation that can establish n-th circuit is as follows:
It arranges:
Wherein, L is each phase inductance value, iLnFor certain moment n-th inductor current value, iLFor certain moment three pole reactor electric current it
With that is,
According to Kirchhoff's current law (KCL), it is as follows to establish high-pressure side capacitance cathode modal equation:
Wherein, C is output capacitance value.
It can for the ifq circuit of RLC element, independent current source and periodic switch composition according to State-space Averaging Principle
To describe its influence to entire circuit in the average value of whole cycle with each circuit state.Certain variable x (t) is switched at one
The mean value calculation method in period is as follows:
Adoption status space average method, to Sn(t)、Sn(t)iLn(t) equalization is carried out to handle:
Since total inductance current control mode cannot do accurately sharing control to every phase inductance electric current, converted in DC/DC
In device real work, inductive current mean bias will lead to.On the one hand, flowing through the maximum phase inductance of electric current may be saturated, and make
It is damaged at converter；On the other hand, difference will occur in the service life of each phase IGBT, and flowing through the maximum phase of electric current for a long time will damage at first
It is bad, reduce system overall life.
The shortcomings that avoid total inductance current control mode, can be used the independent each phase IGBT of control of each phase inductance electric current and account for
Sky ratio and it is adjacent 120 degree of two-phase IGBT phase shift be connected mode, realize each phase sharing control.
Assuming that m phase (m=1,2,3) inductive current and duty ratio are disturbed at a certain moment of converter steady-state operation
It is dynamic, and remaining two-phase inductive current and duty ratio still maintain steady-state value (can equally be well applied to other situations).According to formula
(4), the state equation of (5), system can be described as follows:
Wherein D ' is the steady-state value of upper bridge arm duty ratio；ILFor iLSteady-state value,It is flat for the state space of cell voltage
Mean value, D ' are the steady-state value of upper bridge arm duty ratio,For the State space averaging value of converter output voltage, dm' in m phase
The State space averaging value of bridge arm duty ratio,For the State space averaging value of m phase inductance electric current.
Each state variable of above formula is decomposed into the sum of DC component and small sample perturbations, to carry out small-signal analysis, is enabled:
Wherein, V, Vg、D、IloadRespectivelydn、Steady-state value； Respectively
Fordn、Disturbed value.
It brings (11) formula into (9) formula, (10) formula respectively, eliminate DC component and quadratic term component and La Pula is carried out to it
This transformation, can be obtained the small-signal model of the phase, as follows:
Ignore cell voltage to disturb and arrange (12) formula, (13) formula, can obtain:
Therefore system transter has:
By (16) formula, (17) formula, (18) formula, (19) formula it is found that only needing to offset load current variation in real time to output voltage
Influence can maintain the stabilization of busbar voltage.Use outer ring theoretically as the Voltage loop, the inner ring that are controlled busbar voltage
The control strategy combined for the double-closed-loop control of electric current loop and load-current feedforward that are controlled inductive current can be complete
It totally disappeared except influence of the load current to busbar voltage fluctuation.But due to being influenced current inner loop PI by entire stability of control system
Parameter cannot be too big, and current inner loop response speed has certain delay, and when load current variation is violent, busbar voltage still can
There is larger fluctuation.
Therefore, this programme converses the corresponding high-tension battery output electric current of load current by power conservation law and should
Current value feedovers to the output end of outer voltage；Boost is boosted inclined between reference value and the actual value of Boost output voltage
Difference feedovers to the input terminal of outer voltage, the final two close cycles control for proposing load-current feedforward and voltage deviation feedforward and combining
System strategy, the control mode illustraton of model of the three-phase crisscross parallel Boost sharing control is transformed to according to topological structure, such as
Shown in Fig. 2.Not only the influence that can be realized the sharing control to three-phase current but also load current fluctuations can be effectively suppressed to busbar voltage.
Wherein the output of outer voltage PI1 is the instruction value of inductive current, and the output of current inner loop PI2 is duty ratio, WV(S) for electricity
Deviation is pressed to carry out the transmission function of the second-order low-pass filter of low-pass filtering, Wi(S) for load current progress low-pass filtering
The transmission function of second-order low-pass filter.
It should be understood that above-mentioned specific embodiment of the invention is used only for exemplary illustration or explains of the invention
Principle, but not to limit the present invention.Therefore, that is done without departing from the spirit and scope of the present invention is any
Modification, equivalent replacement, improvement etc., should all be included in the protection scope of the present invention.In addition, appended claims purport of the present invention
Covering the whole variations fallen into attached claim scope and boundary or this range and the equivalent form on boundary and is repairing
Change example.
Claims (5)
1. a kind of tandem type multiphase interleaving Boost control method, which comprises the following steps:
S01: by ignoring output capacitance and inputting the state variable of inductance parasitic resistance reconfiguration system state equation；
S02: the small signal mathematical model of the three-phase crisscross parallel Boost of cascade system is established；
S03: the corresponding high-tension battery output electric current of load current is conversed by power conservation law and the current value feedovers
To the output end of outer voltage；By the Boost deviation boosted between reference value and the actual value of Boost output voltage feedover to
The input terminal of outer voltage.
2. tandem type multiphase interleaving Boost control method according to claim 1, which is characterized in that institute
Stating reconfiguration system state equation in step S01 includes:
Establish the voltage status equation in m phase circuit are as follows:
Wherein, L is each phase inductance value,For the State space averaging value of cell voltage, D ' is the steady-state value of upper bridge arm duty ratio,For the State space averaging value of converter output voltage, dm' for the State space averaging value of bridge arm duty ratio in m phase,
For the State space averaging value of m phase inductance electric current.
Establish high-pressure side capacitance cathode node state equation are as follows:
Wherein D ' is the steady-state value of upper bridge arm duty ratio；ILFor the sum of certain moment three pole reactor electric current iLSteady-state value,It is negative
Carry electric current mean value.
3. tandem type multiphase interleaving Boost control method according to claim 2, which is characterized in that institute
Stating step S02 specific steps includes:
Each state variable of the voltage status equation and high-pressure side capacitance cathode node state equation is decomposed into DC component
The sum of with small sample perturbations, it may be assumed that
Wherein, V, Vg、D、IloadRespectivelydm、Steady-state value； RespectivelyDisturbed value.
It brings (11) formula into (9) formula, (10) formula respectively, eliminate DC component and quadratic term component and Laplce's change is carried out to it
It changes, obtains the small-signal model of the phase are as follows:
4. tandem type multiphase interleaving Boost control method according to claim 3, which is characterized in that
To after the small-signal model of the phase, ignores cell voltage and disturbs and (12) formula, (13) formula are arranged, can obtain:
Obtain system transter, comprising:
5. tandem type multiphase interleaving Boost control method according to claim 1, which is characterized in that institute
The output for stating outer voltage PI in step S03 is the instruction value of inductive current, and the output of current inner loop PI is duty ratio, passes through two
Rank low-pass filter carries out low-pass filtering to voltage deviation, carries out low-pass filtering to load current by second-order low-pass filter.
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Cited By (3)
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| CN111193397A (en) * | 2020-01-14 | 2020-05-22 | 四川航电微能源有限公司 | Dynamic dormancy control method for switching tubes of three-phase interleaved parallel bidirectional DC/DC converter |
| CN114070062A (en) * | 2021-10-21 | 2022-02-18 | 合肥巨一动力系统有限公司 | Control method and device for three-phase interleaved Boost converter |
| CN116191882A (en) * | 2023-03-20 | 2023-05-30 | 无锡凌博电子技术股份有限公司 | Control method of bidirectional DC/DC converter in permanent magnet synchronous motor system |
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|---|---|---|---|---|
| CN111193397A (en) * | 2020-01-14 | 2020-05-22 | 四川航电微能源有限公司 | Dynamic dormancy control method for switching tubes of three-phase interleaved parallel bidirectional DC/DC converter |
| CN111193397B (en) * | 2020-01-14 | 2021-04-02 | 四川航电微能源有限公司 | Dynamic dormancy control method for switching tubes of three-phase interleaved parallel bidirectional DC/DC converter |
| CN114070062A (en) * | 2021-10-21 | 2022-02-18 | 合肥巨一动力系统有限公司 | Control method and device for three-phase interleaved Boost converter |
| CN116191882A (en) * | 2023-03-20 | 2023-05-30 | 无锡凌博电子技术股份有限公司 | Control method of bidirectional DC/DC converter in permanent magnet synchronous motor system |
| CN116191882B (en) * | 2023-03-20 | 2024-02-09 | 无锡凌博电子技术股份有限公司 | Control method of bidirectional DC/DC converter in permanent magnet synchronous motor system |
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