CN109149961A - A kind of power supply system and the method for improving power supply system stability - Google Patents
A kind of power supply system and the method for improving power supply system stability Download PDFInfo
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- CN109149961A CN109149961A CN201811020632.9A CN201811020632A CN109149961A CN 109149961 A CN109149961 A CN 109149961A CN 201811020632 A CN201811020632 A CN 201811020632A CN 109149961 A CN109149961 A CN 109149961A
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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
- H02M7/02—Conversion of ac power input into dc power output without possibility of reversal
-
- 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
- H02M7/02—Conversion of ac power input into dc power output without possibility of reversal
- H02M7/04—Conversion of ac power input into dc power output without possibility of reversal by static converters
- H02M7/12—Conversion of ac power input into dc power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode
- H02M7/21—Conversion of ac power input into dc 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
- H02M7/217—Conversion of ac power input into dc 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
- H02M7/2173—Conversion of ac power input into dc 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 in a biphase or polyphase circuit arrangement
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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
- H02P21/00—Arrangements or methods for the control of electric machines by vector control, e.g. by control of field orientation
- H02P21/22—Current control, e.g. using a current control loop
-
- 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
- H02P2101/00—Special adaptation of control arrangements for generators
- H02P2101/30—Special adaptation of control arrangements for generators for aircraft
-
- 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
- H02P2103/00—Controlling arrangements characterised by the type of generator
- H02P2103/20—Controlling arrangements characterised by the type of generator of the synchronous type
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- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Control Of Eletrric Generators (AREA)
Abstract
The invention discloses a kind of power supply systems, including power generator, fairing, circuit stability device and load；The power generator is system power supply alternating current；The AC conversion that the power generator issues is supplied the load after direct current by the fairing；The circuit stability device detects load-side current disturbing, and makes rectification control to the fairing.The system stability compensation effect is significantly improved, and is also obviously improved to system control performance；Each accurate and effective range of sub- device element can be provided, the design of electric system over all Integration is considered, is crosslinked relationship between each system, to improve electrical equipment efficiency, reduce equipment volume weight, improve power to weight ratio；Reduce the demand of current sensor and communication apparatus, and then mitigate equipment volume and weight, improves power to weight ratio.
Description
Technical field
The present invention relates to the sides of circuit design field more particularly to a kind of power supply system and raising power supply system stability
Method.
Background technique
Stability of power system analysis is the necessary links of aircraft electrical power system master-plan.Currently, with aircraft airborne
A large amount of uses of the increase of electrical equipment, especially converters and motor driving apparatus, more the electrical of electricity aircrafts are born
Capacity, type, power grid complexity is carried to greatly improve compared with conventional airplane electric system.In more electric aircrafts, electric ring control, electricity are made
Dynamic, anti-deicing of electricity etc. largely increases electrical load newly, belongs to the motor or electric power of converters control intrinsically
The resistive load of electronic converter control.The load of separate unit converters can be operated normally according to factory design standard, more
Since equipment room intercouples when platform is run simultaneously, systematic entirety energy is influenced, oscillation even unstability is can lead to when serious and occurs.
Conventional airplane only considers that the performances such as voltage, electric current, capacity, the power quality of equipment refer in electric power system design
Mark, Unstable oscillation phenomenon occurs in order to prevent, can be using the biggish generator of amount of redundancy and converter as primary, secondary electricity
Source, this makes more electric aircraft electrical power system equipment surpluses excessive, causes weight of equipment volume larger, power density is smaller.
Aircraft electrical power system is designed and can be provided to each sub- device element type selecting using consideration stability of power system
Accurate and effective range considers the design of electric system over all Integration, is crosslinked relationship between each system, to improve electrical equipment electricity
Energy utilization efficiency, reduces equipment volume weight, improves power to weight ratio.
Conventional airplane only considers that the performances such as voltage, electric current, capacity, the power quality of equipment refer in electric power system design
Mark, Unstable oscillation phenomenon occurs in order to prevent, can be using the biggish generator of amount of redundancy and converter as primary, secondary electricity
Source, this makes more electric aircraft electrical power system equipment reserved margin in design excessive, causes weight of equipment volume larger, power is close
It spends smaller.Conventional airplane in electric power system design from individual equipment, according to sub- equipment performance demand selector, institute
Not consider system stability from demand is upper.
When using considering that stability of power system is designed aircraft electrical power system, giving sub- part of appliance and choosing model
It encloses.To meet stability of power system, give factors affecting stability (i.e. the selection of hardware design and control design case), and
Judgement is provided in analysis, selects which kind of specific model hardware and control mode.Using stability of power system is considered, to aircraft electricity
Force system carries out over all Integration design, can be improved electrical equipment efficiency, reduces equipment volume weight, improves function weight
Than.
Summary of the invention
The problem of being disturbed present invention aim to address load current in circuit.
To solve the above problems, the first aspect of the present invention provides a kind of power supply system, including power generator, rectification dress
It sets, circuit stability device and load；The power generator is system power supply alternating current；The fairing is by the power generator
The AC conversion of sending be direct current after supply the load；The circuit stability device detects load-side current disturbing, and
Rectification control is made to the fairing.
Further, wherein the fairing is PWM rectifier, the PWM rectifier includes five PI control rings, packet
Include d shaft current ring, q shaft current ring, exciting current ring, direct current pressure ring and alternating current pressure ring.
Further, wherein the circuit stability device includes feedforward stabilising arrangement, the feedforward stabilising arrangement is whole to PWM
The output variable of stream device is observed, and one current disturbing value of load regulation is obtained, before the one current disturbing value of load regulation is brought into
Present transmission function Gsd(s) the first system stabiloity compensation signal is obtained in, and is introduced into the q axis control ring of PWM rectifier, to q
Shaft current compensates.
Further, wherein the circuit stability device further includes extended Kalman filter EKF stabilising arrangement, the expansion
Exhibition Kalman filter EKF is observed load current disturbance, two current disturbing value of load regulation is obtained, by the load regulation two
Current disturbing value brings the front feeding transfer function G intosd(s) in, second system stabiloity compensation signal is obtained, and by described second
System stability thermal compensation signal is introduced into the q axis control ring of source PWM rectifier, is compensated to q shaft current.
Further, wherein the front feeding transfer function Gsd(s) are as follows:
vsqFor main generator unit stator side q shaft voltage, udcFor the actual value of DC bus-bar voltage, τ is that load current disturbing is seen
Measured value, LqFor stator q axle inductance, KipFor electric current loop proportionality coefficient, s is Laplace operator, ωcFor its cutoff frequency.
According to another aspect of the present invention, a kind of a kind of more electric aircraft electrical power systems of power supply system are provided, including upper
State the described in any item power supply systems stabilisations of technical solution.
According to a further aspect of the invention, a kind of more electric aircrafts are provided, including mostly electric described in above-mentioned technical proposal
Aircraft electrical power system.
According to another aspect of the invention, a kind of more electric aircrafts are provided, a method of power supply system stability is improved,
It is characterised by comprising: power generator is system power supply alternating current；The alternating current that fairing issues the power generator turns
Load is supplied after turning to direct current；Circuit stability device detects the load-side current disturbing, and makes to the fairing
Rectification control.
Further, the method for improving power supply system stability further include: circuit stability device is to fairing
The observation of output variable, to obtain one current disturbing value of load regulation；Bring one disturbed value of load regulation into feedforward transmitting letter
Number Gsd(s) in, the first system stabiloity compensation signal is obtained；The first system stabiloity compensation signal is introduced into fairing
Q axis control ring in, q shaft current is compensated.
Further, the method for improving power supply system stability further include: circuit stability device disturbs load current
It is dynamic to be observed, obtain two current disturbing value of load regulation；Bring the two current disturbing value of load regulation into front feeding transfer function Gsd
(s) in, second system stabiloity compensation signal is obtained；The two current disturbing value of load regulation is introduced to the q axis control of fairing
In ring processed, q shaft current is compensated.
The first aspect of the present invention provides a kind of power supply system, including power generator, fairing, circuit stability device
And load；The power generator is system power supply alternating current；The alternating current that the fairing issues the power generator turns
The load is supplied after turning to direct current；The circuit stability device detects load-side current disturbing, and to the fairing
Make rectification control.
Above-mentioned technical proposal of the invention has following beneficial technical effect:
(1) system stability compensation effect is significantly improved, is also obviously improved to system control performance；
(2) each accurate and effective range of sub- device element can be provided, considers the design of electric system over all Integration, each system
Between be crosslinked relationship, to improve electrical equipment efficiency, reduce equipment volume weight, improve power to weight ratio；
(3) reduce the demand of current sensor and communication apparatus, and then mitigate equipment volume and weight, improve function weight
Than.
Detailed description of the invention
Fig. 1 is the power supply system structural schematic diagram of first embodiment according to the present invention；
Fig. 2 is the power supply system structural schematic diagram of another optional embodiment according to the present invention；
Fig. 3 is the power supply system structural schematic diagram of another optional embodiment according to the present invention；
Fig. 4 is the power supply system structural schematic diagram of another optional embodiment according to the present invention；
Fig. 5 is the method flow diagram of the raising power supply system stability of another optional embodiment according to the present invention；
Fig. 6 is the method flow diagram of the raising power supply system stability of another optional embodiment according to the present invention；
Fig. 7 is the method flow diagram of the raising power supply system stability of another optional embodiment according to the present invention；
Fig. 8 is that the three-level formula synchronous motor of another optional embodiment according to the present invention and the system structure of PWM rectifier are shown
It is intended to；
Fig. 9 is the main starting/generator PWM rectifier control signal of source of another optional embodiment according to the present invention
Figure；
Figure 10 is that the load current that contains of another optional embodiment according to the present invention disturbs ioSource PWM rectifier q axis
Control ring schematic diagram；
Figure 11 is that the stabiloity compensation policy construction containing disturbance observer of another optional embodiment according to the present invention shows
It is intended to.
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.
Schematic diagram of a layer structure according to an embodiment of the present invention is shown in the attached drawings.These figures are not drawn to scale
, wherein for purposes of clarity, some details are magnified, and some details may be omitted.It is shown in the drawings various
Region, the shape of layer and relative size, positional relationship between them are merely exemplary, in practice may be public due to manufacture
Difference or technical restriction and be deviated, and those skilled in the art may be additionally designed as required has not similar shape
Shape, size, the regions/layers of relative position.
Obviously, described embodiments are some of the embodiments of the present invention, instead of all the embodiments.Based on the present invention
In embodiment, every other implementation obtained by those of ordinary skill in the art without making creative efforts
Example, shall fall within the protection scope of the present invention.
In the description of the present invention, it should be noted that term " first ", " second ", " third " are used for description purposes only,
It is not understood to indicate or imply relative importance.
As long as in addition, the non-structure each other of technical characteristic involved in invention described below different embodiments
It can be combined with each other at conflict.
The first embodiment of the present invention provides a kind of power supply system, including power generator, fairing, circuit stability dress
It sets and loads；Power generator is system power supply alternating current；The AC conversion that fairing issues power generator is direct current
Supply load afterwards；Circuit stability device detects load-side current disturbing, and makes rectification control to fairing.
Optionally, wherein fairing is PWM rectifier, and PWM rectifier includes five PI control rings, including d shaft current
Ring, q shaft current ring, exciting current ring, direct current pressure ring and alternating current pressure ring.
Optionally, wherein circuit stability device includes feedforward stabilising arrangement, and feedover output of the stabilising arrangement to PWM rectifier
Variable is observed, and obtains one current disturbing value of load regulation, brings one current disturbing value of load regulation into front feeding transfer function Gsd(s)
Middle acquisition the first system stabiloity compensation signal, and be introduced into the q axis control ring of PWM rectifier, q shaft current is compensated.
Optionally, wherein circuit stability device further includes extended Kalman filter EKF stabilising arrangement, spreading kalman filter
Wave device EKF is observed load current disturbance, obtains two current disturbing value of load regulation, two current disturbing value of load regulation is brought into
The front feeding transfer function Gsd(s) in, second system stabiloity compensation signal is obtained, and by second system stabiloity compensation signal
It is introduced into the q axis control ring of source PWM rectifier, q shaft current is compensated.
Optionally, wherein front feeding transfer function Gsd(s) are as follows:
vsqFor main generator unit stator side q shaft voltage, udcFor the actual value of DC bus-bar voltage, τ is that load current disturbing is seen
Measured value, LqFor stator q axle inductance, KipFor electric current loop proportionality coefficient, s is Laplace operator, ωcFor its cutoff frequency.
An alternate embodiment of the present invention on the other hand, provides a kind of a kind of more electric aircraft electrical power systems of power supply system,
Power supply systems stabilisation including any one of above-mentioned technical proposal.
An alternate embodiment of the present invention another aspect provides a kind of more electric aircrafts, including the more of above-mentioned technical proposal
Electric aircraft electrical power system.
The another aspect of an alternate embodiment of the present invention provides a kind of method for improving power supply system stability, comprising: hair
Denso is set to system power supply alternating current；The AC conversion that fairing issues power generator is supply load after direct current；
Circuit stability device detects load-side current disturbing, and makes rectification control to fairing.
Optionally, the method for power supply system stability is improved further include: circuit stability device becomes the output of fairing
The observation of amount, to obtain one current disturbing value of load regulation；Bring one disturbed value of load regulation into front feeding transfer function Gsd(s) in,
Obtain the first system stabiloity compensation signal；The first system stabiloity compensation signal is introduced into the q axis control ring of fairing,
Q shaft current is compensated.
Optionally, the method for power supply system stability is improved further include: circuit stability device disturbs load current and carries out
Observation, obtains two current disturbing value of load regulation；Bring two current disturbing value of load regulation into front feeding transfer function Gsd(s) it in, obtains
Second system stabiloity compensation signal；Two current disturbing value of load regulation is introduced into the q axis control ring of fairing, to q axis electricity
Stream compensates.
Fig. 1 is the power supply system structural schematic diagram of first embodiment according to the present invention；
As shown in Figure 1, first embodiment of the invention provides a kind of power supply system, including power generator, fairing, electricity
Road stabilising arrangement and load；Fairing is electrically connected with power generator, circuit stability device and load respectively, and circuit stability
Device is also electrically connected with load, and power generator is system power supply alternating current；The alternating current that fairing issues power generator turns
Load is supplied after turning to direct current；Circuit stability device detects load-side current disturbing, and makes rectification control to fairing.
The system can make circuit stability compensation effect be significantly improved, also be obviously improved to circuit control performance.
In an alternative embodiment, wherein fairing is PWM rectifier, and PWM rectifier includes five PI control rings, packet
Include d shaft current ring, q shaft current ring, exciting current ring, direct current pressure ring and alternating current pressure ring.
The technical solution of the application motion first provides object mould using direct current supply framework electric more than future as analysis object
Then type designs disturbance observer for observed result compensation system, improves stability.Currently, the power supply of more electricity is mainly
Three-level formula synchronous motor and PWM rectifier are constituted, as shown in Figure 8, wherein three-level formula synchronous motor is by pilot exciter, main excitation
Machine and main starting/generator are constituted, and pilot exciter is permanent magnet synchronous motor, and main exciter and main starting/generator are respectively to revolve
Turn armature type and rotary pole formula electric excitation synchronous motor.
Under generating state, simplified within the acceptable range, by excitation side, that is, pilot exciter of main generator and master
The electromagnetic transient of exciter is equivalent to become first order inertial loop.Following analysis considers main generator and source PWM rectification
The model of device.
Under generating state, main starting/generator generallys use the i of synchronous motor in more electricity aircraftsd=0 vector control
System, control schematic diagram are as shown in Figure 9.Wherein, dotted line is the above are stator side control schematic diagram, and the following are rotor-side signals for dotted line
Figure.Altogether there are five PI control ring in the control of main starting/generator PWM rectifier, including d shaft current ring, q shaft current ring, encourage
Magnetic electric current loop, direct current pressure ring and alternating current pressure ring, and electric voltage feed forward item is introduced after d shaft current ring, q shaft current ring, make
It obtains stator side and realizes Feedforward Decoupling.Since the parameter for controlling used is folded to stator side, in the control ring of rotor-side,
The electric current and voltage of obtained rotor-side are the value for being folded to stator side.
The governing equation of source PWM rectifier can be write out according to Fig. 9:
Wherein, isdrefD shaft current reference value, i are surveyed for statorsdD shaft current actual value, i are surveyed for statorsqrefQ is surveyed for stator
Shaft current reference value, isqQ shaft current actual value, k are surveyed for statorpiFor the proportionality coefficient in d shaft current PI control ring, kiiFor d axis
Integral coefficient in electric current PI control ring, S are the plural number about frequency, vsdFor main generator unit stator side d shaft voltage, ω is three-level
The synchronous rotational speed of formula synchronous motor, ψqFor q axis magnetic linkage, ψdFor d axis magnetic linkage, udcrefFor the reference value of DC bus-bar voltage, udcFor
The actual value of DC bus-bar voltage, kpdcFor the proportionality coefficient in DC bus-bar voltage PI control ring, kidcFor DC bus-bar voltage
Integral coefficient in PI control ring, isqrefQ shaft current reference value, i are surveyed for statorsqQ shaft current actual value is surveyed for stator, | V |ref
For the reference value of alternating voltage in main generator, | V | for the actual value of alternating voltage in main generator, kpvTo be handed in main generator
Galvanic electricity presses the proportionality coefficient in PI control ring, kivFor the integral coefficient in main generator in alternating voltage PI control ring, ifdref'
The reference value of exciting current, i are surveyed for main generator rotorfd' be main generator rotor side exciting current actual value, kpifBased on
Proportionality coefficient in the exciting current PI control ring of generator amature side, kiifFor in the exciting current PI control ring of main generator rotor side
Integral coefficient, vfd' it is main generator rotor side excitation voltage value.
The tracking accuracy of system reflects the ability that system output variables follow instruction value, and the Disturbance Rejection ability of system is
Finger remains to the stable ability of maintenance system after system is interfered.The tracking accuracy and Disturbance Rejection ability of usual system are mutual
Contradiction can not get both.It can compensate for system stability based on the inhibition to load disturbance.It is proposed in this paper a kind of based on expansion card
The disturbance observer of Thalmann filter compensation stability can be improved system stability.
Disturbance observer and feed-forward compensation system are combined with general vector control constitutes two-degree-freedom controller, is based on
Disturbance observer can meet simultaneously the requirement of these two aspects with the tracking performance and interference free performance of independent design system,
And this disturbance observer can reduce the required sensor and communication apparatus of Stability of Complex System compensation, so as to mention
The power density of high system.This paper presents the overall structure of the stabiloity compensation strategy based on disturbance feedforward, then propose
Extended Kalman filter disturbance observer.The stability of system and control performance are mentioned after introducing disturbance observer
It rises.
The structure of stabiloity compensation based on disturbance feedforward is as shown in figure 11.The closed loop transfer function, of system q shaft current ring
It is as follows:
Wherein, GiIt (s) is electric current loop open-loop transfer function, KipFor electric current loop proportionality coefficient, KiiFor electric current loop integral coefficient,
RsFor stator resistance, LqFor stator q axle inductance, s is Laplace operator.
The observation of EKF is load current disturbing io, it is therefore desirable to calculate the front feeding transfer function G in the case of this kindsd。
As shown in Figure 11, PWM rectifier side transmission function expression formula is write out:
And load current disturbance observation valueWith load disturbance actual value ioBetween relationship be approximately considered:
Wherein, Gsc(s) closed loop transfer function, of system q shaft current ring, τ are load current disturbing observationIt converges to negative
Carry disturbance actual value ioTime constant.To make the feedforward compensation of load be completely counterbalanced by the load disturbance of system, take:
In order to realize its physics can, low-pass filter generally is introduced in pure differential link:
Wherein, ωcFor its cutoff frequency.
The control of source PWM rectifier is as shown in figure 9, can be by its q axis control ring, that is, direct current pressure ring and q shaft current ring etc.
Imitate into structure as shown in Figure 10, wherein ioIt is electrical actuation load current i for the sum of all load currents1, electric ring control load electricity
Flow i2, electric deicing load current i3The sum of.
As shown in Figure 10, source q axis controls so that the output DC voltage tracking DC voltage reference of source PWM rectifier
Value, for the vector controlled of source PWM rectifier, load current ioIt is a disturbance quantity.If by load current ioCaused q
The variation of shaft current actual value feedovers, and feedforward amount can be completely counterbalanced by load current disturbance, then the compensation and former vector controlled
A two degrees of freedom observer is constituted, the stability of system can be improved.
Fig. 2 is the power supply system structural schematic diagram of another optional embodiment according to the present invention；
As shown in Fig. 2, wherein circuit stability device includes feedforward stabilising arrangement, feedforward compensation in an alternative embodiment
Device includes disturbance observer, and disturbance observer is observed the output variable of PWM rectifier, obtains one electric current of load regulation and disturbs
Dynamic value, brings one current disturbing value of load regulation into front feeding transfer function Gsd(s) the first system stabiloity compensation signal is obtained in, and
Thermal compensation signal is introduced into the q axis control ring of PWM rectifier, q shaft current is compensated.
Load current disturbance is observed by the output variable of source PWM rectifier, and passes through front feeding transfer function Gsd(s) make
It for system stability thermal compensation signal, injects in the q axis control ring of source PWM rectifier, load current disturbance is offset, to improve
The stability of system.The structure of compensation policy based on disturbance feedforward is as shown in figure 11.
The load of MEA HVDC power supply system is numerous and complexity is high, and direct value of measured load current carries out feedforward compensation
A large amount of current sensor is needed, and load current data is sent at source control from load place, a large amount of communication is needed to connect
Mouthful, extremely complex, power supply system proposed by the present invention, observation effect meets, stabiloity compensation effect improves, to system controlling
The influence of energy is promoted, this all demonstrates the stabiloity compensation method based on disturbance feedforward for the validity of MEA HVDC system.
Fig. 3 is the power supply system structural schematic diagram of another optional embodiment according to the present invention；
As shown in figure 3, wherein circuit stability device further includes extended Kalman filter EKF in an alternative embodiment
Stabilising arrangement, extended Kalman filter EKF are observed load current disturbance, obtain two current disturbing value of load regulation, will
Two current disturbing value of load regulation brings the front feeding transfer function G intosd(s) in, second system stabiloity compensation signal is obtained, and will
Second system stabiloity compensation signal is introduced into the q axis control ring of source PWM rectifier, is compensated to q shaft current.
Extended Kalman filter EKF is a kind of observer applied to nonlinear system, its adjustment factor can be with
It is adjusted in real time with the error that the state variable at current time is estimated, to can guarantee state observation in dynamic process
Convergence rate is very fast, while can also guarantee the stability of system in stable state.Wherein, the Q matrix of EKF and R matrix can be used to
Control to adjust the convergence rate of coefficient.
For MEA HVDC power supply system, it is assumed that for load current there is no mutation, i.e. the variation of load current is very slow
Slowly, therefore meet:
The kirchhoff current equation of simultaneous source dc-link capacitance node can obtain the shape of source PWM rectifier output
State equation:
The state variable of system and output are defined as follows:
X=[udc,io]T
Y=udc
The state equation of observer can approximate expression are as follows:
Wherein
To can use the observer state equation discretization of continuous differential approximate Euler method and formula be unfolded, obtain:
xk=f (xk-1)+wk-1
yk=Cxk+vk
Wherein
Wherein, wk-1And vkFor the noise of actual observation device.
Thus, it is possible to calculate:
According to above-mentioned analysis and iterative parameter, solving state variable udc,ioIterative step it is as follows:
Pk -=FkPk-1Fk T+Qk-1
Kk=Pk -CT(CPk -CT+Rk)-1
Pk=(I-KkHk)Pk -
Wherein, PkFor the covariance matrix of state variable priori estimates error.By continuous iteration, P can be madek's
Mark is minimum, therefore EKF algorithm is a kind of algorithm of optimal observer, and the error for the current state variable estimated value that it can make is most
It is small.
Therefore by after extended Kalman filter disturbance observer introducing system, the stability and control performance of system are equal
It gets a promotion.
Fig. 4 is the power supply system structural schematic diagram of another optional embodiment according to the present invention；
As shown in figure 4, including feedforward stabilising arrangement and extended Kalman filter in system in an alternative embodiment
EKF stabilising arrangement, wherein feedforward observation of the stabilising arrangement by the output variable to PWM rectifier, and then the loaded
Then one current disturbing value brings one current disturbing value of load regulation into front feeding transfer function Gsd(s) the first system is obtained in stablize
Property thermal compensation signal, and be introduced into the q axis control ring of PWM rectifier, q shaft current is compensated, meanwhile, Extended Kalman filter
Device EKF is observed load current disturbance, obtains two current disturbing value of load regulation, brings two current disturbing value of load regulation into institute
State front feeding transfer function Gsd(s) in, second system stabiloity compensation signal is obtained, and second system stabiloity compensation signal is drawn
Enter in the q axis control ring of source PWM rectifier, q shaft current is compensated.
By feedforward stabilising arrangement and extended Kalman filter EKF stabilising arrangement co-ordination, the steady of system can be made
Qualitative and control performance gets a promotion.
Fig. 5 is the method flow diagram of the raising power supply system stability of an optional embodiment according to the present invention；
As shown in figure 5, providing a kind of method for improving power supply system stability in an alternative embodiment, comprising:
S1, power generator are system power supply alternating current；
S2, the AC conversion that fairing issues power generator are supply load after direct current；
S3, circuit stability device detects load-side current disturbing, and makes rectification control to fairing.
This method can make system stability compensation effect be significantly improved, and can to provide each sub- device element accurate and effective
Range, consider the design of electric system over all Integration, be crosslinked relationship between each system, to improve electrical equipment utilization of power effect
Rate reduces equipment volume weight, improves power to weight ratio.
Fig. 6 is the method flow diagram of the raising power supply system stability of another optional embodiment according to the present invention；
As shown in fig. 6, in an alternative embodiment, the method for raising power supply system stability further include: S21, circuit are steady
Observation of the device to the output variable of fairing is determined, to obtain one current disturbing value of load regulation；S22 disturbs load regulation one
Dynamic value brings front feeding transfer function G intosd(s) in, the first system stabiloity compensation signal is obtained；S23 mends the first system stability
It repays signal to be introduced into the q axis control ring of fairing, q shaft current is compensated.This method can be such that system stability compensates
Effect is significantly improved, and is also obviously improved to system control performance.
Fig. 7 is the method flow diagram of the raising power supply system stability of another optional embodiment according to the present invention.
As shown in fig. 7, in an alternative embodiment, the method for raising power supply system stability further include: S31, circuit are steady
Determine device to be observed load current disturbance, obtains two current disturbing value of load regulation；S32, by two current disturbing value of load regulation
Bring front feeding transfer function G intosd(s) in, second system stabiloity compensation signal is obtained；S33 draws two current disturbing value of load regulation
Enter in the q axis control ring of fairing, q shaft current is compensated.
This method can make system stability compensation effect be significantly improved, and also have to system control performance and significantly mention
It rises；Reduce the demand of current sensor and communication apparatus, and then mitigate equipment volume and weight, improves power to weight ratio.
The present invention is directed to protect a kind of power supply system, including power generator, fairing, circuit stability device and load；
The power generator is system power supply alternating current；The AC conversion that the fairing issues the power generator is direct current
The load is supplied after electricity；The circuit stability device detects load-side current disturbing, and makes rectification to the fairing
Control.The system stability compensation effect is significantly improved, is also obviously improved to system control performance；Each sub- equipment can be provided
The accurate and effective range of device considers the design of electric system over all Integration, is crosslinked relationship between each system, electrically sets to improve
Standby efficiency, reduces equipment volume weight, improves power to weight ratio；Reduce the need of current sensor and communication apparatus
It asks, and then mitigates equipment volume and weight, improve power to weight ratio.
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 (10)
1. a kind of power supply system, including power generator, fairing, circuit stability device and load；
The power generator is system power supply alternating current；
The AC conversion that the power generator issues is supplied the load after direct current by the fairing；
The circuit stability device detects load-side current disturbing, and makes rectification control to the fairing.
2. power supply system according to claim 1, wherein the fairing is PWM rectifier, the PWM rectifier packet
Include five PI control rings, including d shaft current ring, q shaft current ring, exciting current ring, direct current pressure ring and alternating current pressure ring.
3. power supply system according to claim 2, wherein the circuit stability device includes feedforward stabilising arrangement,
The feedforward stabilising arrangement is observed the output variable of PWM rectifier, one current disturbing value of load regulation is obtained, by institute
It states one current disturbing value of load regulation and brings front feeding transfer function G intosd(s) the first system stabiloity compensation signal is obtained in, and is introduced
In the q axis control ring of PWM rectifier, q shaft current is compensated.
4. power supply system according to claim 2 or 3, wherein the circuit stability device further includes Extended Kalman filter
Device EKF stabilising arrangement,
The extended Kalman filter EKF is observed load current disturbance, two current disturbing value of load regulation is obtained, by institute
It states two current disturbing value of load regulation and brings the front feeding transfer function G intosd(s) in, second system stabiloity compensation signal is obtained, and
The second system stabiloity compensation signal is introduced into the q axis control ring of source PWM rectifier, q shaft current is compensated.
5. power supply system according to claim 3 or 4, wherein the front feeding transfer function Gsd(s) are as follows:
vsqFor main generator unit stator side q shaft voltage, udcFor the actual value of DC bus-bar voltage, τ is load current disturbing observation,
LqFor stator q axle inductance, KipFor electric current loop proportionality coefficient, s is Laplace operator, ωcFor its cutoff frequency.
6. a kind of more electric aircraft electrical power systems, which is characterized in that including the described in any item power supply systems of claim 1-5.
7. a kind of more electric aircrafts, which is characterized in that including more electric aircraft electrical power systems as claimed in claim 6.
8. a kind of method for improving power supply system stability characterized by comprising
Power generator is system power supply alternating current；
The AC conversion that fairing issues the power generator is supply load after direct current；
Circuit stability device detects the load-side current disturbing, and makes rectification control to the fairing.
9. according to the method described in claim 8, it is characterized by further comprising:
Observation of the circuit stability device to the output variable of fairing, to obtain one current disturbing value of load regulation；
Bring one disturbed value of load regulation into front feeding transfer function Gsd(s) in, the first system stabiloity compensation signal is obtained；
The first system stabiloity compensation signal is introduced into the q axis control ring of fairing, q shaft current is compensated.
10. method according to claim 8 or claim 9, which is characterized in that further include:
Circuit stability device is observed load current disturbance, obtains two current disturbing value of load regulation；
Bring the two current disturbing value of load regulation into front feeding transfer function Gsd(s) in, second system stabiloity compensation letter is obtained
Number；
The two current disturbing value of load regulation is introduced into the q axis control ring of fairing, q shaft current is compensated.
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