CN104319813B - Off-network type wind power system two electromotor cascade operation control system and method - Google Patents
Off-network type wind power system two electromotor cascade operation control system and method Download PDFInfo
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Abstract
The invention belongs to off-network type permanent magnetism wind power system and run control field, be incorporated into the power networks for realizing two electromotors simultaneously, while expanding power system capacity, expand electromotor speed adjustable range.To this end, the present invention adopts the technical scheme that, off-network type wind power system two electromotor cascade operation control system and method, structure is: two permanent-magnetic wind driven generators, and every generator unit stator connects uncontrollable rectifier circuit;Often set uncontrollable rectifier circuit is followed by a set of boost chopper;Often set boost chopper includes a boost inductance, a boosting power switch pipe and a fast recovery diode.And step one, by permanent-magnetic wind driven generator principle, and analyze current commutation process, obtaining uncontrollable rectifier circuit output voltage meansigma methods is: step 2, calculate boosting power switch pipe dutycycle under boost chopper series and parallel state respectively;Step 3, hysteresis control method thereof.Present invention is mainly applied to permanent magnetism wind power system and run control.
Description
Technical field
The invention belongs to off-network type permanent magnetism wind power system and run control field, relate to the correlation technique of field of power electronics.Specifically,
Relate to off-network type wind power system two electromotor cascade operation control system and method.
Technical background
China is vast in territory, with a varied topography, and outlying pastoral area, rural area, island and frontier sentry etc. exist user's dispersion, use
The features such as electricity is relatively small.Off-network type wind power system has the advantages such as convenient, with low cost, the flexible form of erection, can be relatively
Meet well the need for electricity in above-mentioned area, thus be used widely.Along with expanding economy, residential electricity consumption equipment is increasingly
Many, power consumption increases the most year by year.Original off-network type wind power system capacity is difficult to meet the need for electricity of resident, as abandoned former system
Unite and use the wind power system of novel larger capacity, bigger waste can be caused;Simple series/parallel can limit again the operation of electromotor
Scope, therefore off-network type wind power system increase-volume problems demand solves.The most single set off-network type wind power system design and control method side
The document in face is more, but many cover systems cascade method of being incorporated into the power networks is had no report.
Summary of the invention
For overcoming the deficiencies in the prior art, it is achieved two electromotors are incorporated into the power networks simultaneously, while expanding power system capacity, expand and send out
Electric machine speed regulation scope.To this end, the present invention adopts the technical scheme that, the cascade of off-network type wind power system two electromotor runs and controls system
System, structure is: two permanent-magnetic wind driven generators, and every generator unit stator connects uncontrollable rectifier circuit;Often after set uncontrollable rectifier circuit
Connect a set of boost chopper;Often set boost chopper includes a boost inductance, a boosting power switch pipe and one
Fast recovery diode, described boost inductance is connected on input positive pole and the boosting power switch pipe forward of this boost chopper
Between conducting input, described fast recovery diode anode is connected with boosting power switch pipe forward conduction input, negative electrode
It is connected with the output cathode of this boost chopper;The output cathode of the 1st set boost chopper and the 2nd set boost chopper
Output negative pole be connected with storage capacitor both positive and negative polarity respectively, two set boost choppers outfans opened by a change of current power
Pass pipe is connected in series, and its connected mode is, the output negative pole of the 1st set circuit and change of current power switch pipe forward conduction outfan
Connecting, the output cathode of the 2nd set circuit is connected with change of current power switch pipe forward conduction input;1st set boost chopper electricity
The input negative pole of the input negative pole on road and the 2nd set boost chopper is connected by a level combination diode, and this level is combined two poles
The input negative pole of the negative electrode of pipe and the 1st set circuit connects, and the input negative pole of anode and the 2nd set circuit connects;1st set boosting is cut
The boosting of wave circuit power switch pipe forward conduction input and the boosting power switch pipe forward of the 2nd set boost chopper
Connecting also by a level combination diode between conducting input, the boosting of this grade of combination diode cathode and the 1st set circuit is used
Power switch pipe forward conduction input connects, and the boosting of anode and the 2nd set circuit is with power switch pipe forward conduction input even
Connect.
Off-network type wind power system two electromotor cascade progress control method, realizes by means of aforementioned means, and comprises the steps:
Step one, by permanent-magnetic wind driven generator principle, and analyze current commutation process, obtain uncontrollable rectifier circuit output voltage average
Value is:
In formula, U1d、U2dIt is respectively two set uncontrollable rectifier circuit output voltage meansigma methodss;ω1、ω2It is respectively two generator speeds;
I1s、I2sIt is respectively two electromotor phase current virtual values;KeFor back emf coefficient;VdiodeFor uncontrollable rectifier circuit diode pipe pressure
Fall;LsFor generator unit stator phase inductance;
Under step 2, respectively calculating boost chopper series and parallel state, power switch pipe dutycycle is used in boosting
Uncontrollable rectifier circuit output voltage meansigma methods and boost chopper output voltage average value can be obtained by boost chopper principle
Between relation be
In formula, U1dc、U2dcIt is respectively two set boost chopper output voltage average values;d1、d2It is respectively two boosting power to open
Close the dutycycle of pipe.
When two set boost choppers are in series connection, DC capacitor voltage is
Udc=U1dc+U2dc
In formula, UdcFor DC capacitor voltage.
When two set boost choppers are in parallel connection, DC capacitor voltage is
Udc=U1dc=U2dc
I.e. approximate calculation the boosting power switch pipe dutycycle under different rotating speeds, different cascade system can be gone out by above formula;
Step 3, hysteresis control method thereof
In initialization system, by bound and calculated dutycycle, boosting power switch pipe dutycycle bound, determines that state is cut
Change critical speed;Dutycycle under calculated different rotating speeds compared with upper lower limit value, under series system, when calculating
When the dutycycle arrived is less than lower limit, this rotating speed i.e. for being switched to critical speed ω of parallel way by series systemmax;In parallel connection
Under mode, when calculated dutycycle is higher than higher limit, this rotating speed is i.e. for be switched to the critical of series system by parallel way
Rotational speed omegamin;
When wind speed is relatively low, generator speed compared with slow, terminal voltage is relatively low, make change of current power switch pipe turn on, make system work
In series connection, to meet the inverter requirement to DC capacitor voltage;When wind speed raises, generator speed raises, end
Voltage is higher, and two generator speeds all exceed critical speed ωmaxTime, make change of current power switch pipe turn off, make system work
In parallel connection, it is ensured that stablizing of DC capacitor voltage, avoid boosting power switch pipe simultaneously and limit dutycycle occurs;
When wind speed reduces, two generator speeds are below critical speed ωminTime, make change of current power switch pipe turn on, make system
Come back to series connection.
Make ωmax>ωminSo that algorithm has stagnant ring function, when wind speed the most frequently vibrates, it is to avoid frequent switched system
The situation of series and parallel state.
Compared with the prior art, the technical characterstic of the present invention and effect:
The present invention proposes a kind of off-network type wind power system two electromotor cascade progress control method, with two permanent-magnetic wind driven generators,
Two set uncontrollable rectifier circuit, two set boost choppers and related peripheral device are hardware foundation, use Hysteresis control algorithm to realize
Two electromotors are incorporated into the power networks simultaneously, thus can be effectively increased power system capacity, and extend electromotor speed adjustable range;Can make simultaneously
Boosting power switch pipe dutycycle runs in zone of reasonableness, reduces higher hamonic wave, improves systematic function.
Accompanying drawing explanation
Fig. 1 off-network of the present invention type wind power system block diagram.
Fig. 2 electromotor and uncontrollable rectifier circuit equivalent circuit diagram.
Fig. 3 electric current shifts to the process of a phase from c phase.
Detailed description of the invention
For off-network type wind power system increase-volume problem, it is proposed that a kind of off-network type wind power system two electromotor cascade progress control method,
With two permanent-magnetic wind driven generators, two set uncontrollable rectifier circuit, two set boost choppers and related peripheral device as hardware foundation,
Use Hysteresis control algorithm to realize two electromotors to be incorporated into the power networks simultaneously, while expanding power system capacity, expand electromotor speed governing
Scope.The technical solution used in the present invention is:
Step one, approximate calculation uncontrollable rectifier circuit output voltage meansigma methods
System concrete structure is: two permanent-magnetic wind driven generators, and every generator unit stator connects uncontrollable rectifier circuit;Often overlap do not control whole
Current circuit is followed by a set of boost chopper;Often set boost chopper includes a boost inductance, a boosting power switch
Pipe and a fast recovery diode, described boost inductance is connected on the input positive pole of this boost chopper and opens with boosting power
Closing between pipe forward conduction input, described fast recovery diode anode is with boosting power switch pipe forward conduction input even
Connecing, negative electrode is connected with the output cathode of this boost chopper;The output cathode of the 1st set boost chopper and the 2nd set boosting
The output negative pole of chopper circuit is connected with storage capacitor both positive and negative polarity respectively, and the outfan of two set boost choppers is by a change of current
Being connected in series with power switch pipe, its connected mode is, the output negative pole of the 1st set circuit and the positive guide of change of current power switch pipe
Logical outfan connects, and the output cathode of the 2nd set circuit is connected with change of current power switch pipe forward conduction input;1st set rises
The input negative pole of pressure chopper circuit and the input negative pole of the 2nd set boost chopper are connected by a level combination diode, this level
The negative electrode of combination diode and the input negative pole of the 1st set circuit connect, and the input negative pole of anode and the 2nd set circuit connects;1st
The boosting power switch pipe forward conduction input of set boost chopper and the boosting power of the 2nd set boost chopper are opened
Close and connect also by a level combination diode between pipe forward conduction input, this level combination diode cathode and the 1st set circuit
Boosting with power switch pipe forward conduction input connect, anode with the 2nd overlap circuit boosting power switch pipe forward conduction
Input connects.
By permanent-magnetic wind driven generator principle, and analyze current commutation process, generator speed and uncontrollable rectifier circuit output electricity can be obtained
The relation flattened between average is
In formula, U1d、U2dIt is respectively two set uncontrollable rectifier circuit output voltage meansigma methodss;ω1、ω2It is respectively two generator speeds;
I1s、I2sIt is respectively two electromotor phase current virtual values;KeFor back emf coefficient;VdiodeFor uncontrollable rectifier circuit diode pipe pressure
Fall;LsFor generator unit stator phase inductance.
Under step 2, respectively calculating boost chopper series and parallel state, power switch pipe dutycycle is used in boosting
Uncontrollable rectifier circuit output voltage meansigma methods and boost chopper output voltage average value can be obtained by boost chopper principle
Between relation be
In formula, U1dc、U2dcIt is respectively two set boost chopper output voltage average values;d1、d2It is respectively two boosting power to open
Close the dutycycle of pipe.
When two set boost choppers are in series connection, DC capacitor voltage is
Udc=U1dc+U2dc
In formula, UdcFor DC capacitor voltage.
When two set boost choppers are in parallel connection, DC capacitor voltage is
Udc=U1dc=U2dc
Approximate calculation the boosting power switch pipe dutycycle under different rotating speeds, different cascade system can be gone out by above formula.
Step 3, hysteresis control method thereof
In initialization system, by bound and calculated dutycycle, boosting power switch pipe dutycycle bound, determines that state is cut
Change critical speed.Dutycycle under calculated different rotating speeds compared with upper lower limit value, under series system, when calculating
When the dutycycle arrived is less than lower limit, this rotating speed i.e. for being switched to critical speed ω of parallel way by series systemmax;In parallel connection
Under mode, when calculated dutycycle is higher than higher limit, this rotating speed is i.e. for be switched to the critical of series system by parallel way
Rotational speed omegamin。
When wind speed is relatively low, generator speed compared with slow, terminal voltage is relatively low, make change of current power switch pipe turn on, make system work
In series connection, to meet the inverter requirement to DC capacitor voltage;When wind speed raises, generator speed raises, end
Voltage is higher, and two generator speeds all exceed critical speed ωmaxTime, make change of current power switch pipe turn off, make system work
In parallel connection, it is ensured that stablizing of DC capacitor voltage, avoid boosting power switch pipe simultaneously and limit dutycycle occurs;
When wind speed reduces, two generator speeds are below critical speed ωminTime, make change of current power switch pipe turn on, make system
Come back to series connection.In the algorithm, ω is mademax>ωminSo that algorithm has stagnant ring function, when wind speed the most frequently shakes
When swinging, it is to avoid the situation of frequent switched system series and parallel state.
The present invention is further described below in conjunction with the accompanying drawings with instantiation.
The present invention is applicable to outside the Pass by two permanent-magnetic wind driven generators, two set uncontrollable rectifier circuit, two set boost choppers and phase
The off-network type wind power system of peripheral device composition.Below in conjunction with concrete example and accompanying drawing, the present invention is further described.Example is adopted
Electromotor quantity be 2 (electromotor 1 and electromotors 2), processor uses the TMS320F28335 single of TI company
Sheet is controlled.System block diagram as it is shown in figure 1, in figure, U1d、U2dFor uncontrollable rectifier circuit output voltage meansigma methods;U1dc、
U2dcFor boost chopper output voltage average value;UdcFor DC capacitor voltage;S1、S2For boosting power switch pipe;
S3For change of current power switch pipe;D1、D2For fast recovery diode;D3、D4It is combined diode for level;L1、L2For a liter piezoelectricity
Sense.
(1) when electromotor low cruise, controller gathers wind speed information, maximal wind-energy capture principle calculate electromotor reference
Rotational speed omega1refAnd ω2ref。
(2) approximate calculation uncontrollable rectifier circuit output voltage meansigma methods, concrete calculating process is as follows:
As a example by the 1st electromotor, ignore generator unit stator resistance, using electromotor and uncontrollable rectifier circuit as an entirety,
Equivalent circuit can be obtained as shown in Figure 2.In figure, u1a、u1b、u1cFor generator voltage;e1a、e1b、e1cContrary for electromotor
Electromotive force, i1a、i1b、i1cFor generator unit stator phase current;LsFor generator unit stator inductance;U1dFor uncontrollable rectifier circuit output voltage
Meansigma methods;I1dFor uncontrollable rectifier circuit output current meansigma methods;D11~D16For uncontrollable rectifier circuit diode;A point, b point, c
Point is electromotor opposite potential output point;N point is generator unit stator winding neutral point.According to magneto operation logic,
Electromotor opposite potential virtual value is represented by
In formula, E1SFor electromotor opposite potential virtual value, p1For power generator electrode logarithm, ω1For generator speed, Ψ1fFor rotor flux,
KeFor back emf coefficient.
In uncontrollable rectifier circuit work process, owing to generator unit stator exists inductance, therefore current commutation process cannot be instantaneous complete
Become.In three-phase equilibrium circuit, each commutation situation is the most identical, and we study electric current by electric current as a example by c phase shifts to a phase herein
Commutation process, equivalent circuit that commutation process is relevant and curent change situation are as shown in Figure 3.In figure, i1dFor uncontrollable rectifier electricity
Road output current instantaneous value;u1commFor the voltage difference that a phase and c are alternate;i1mFor a phase and the loop current in c phase composition loop;
u1La、u1LcFor a, c phase stator inductance voltage;u1an、u1bn、u1cnFor the voltage difference between a point, b point, c point and n point;
P point, N point are respectively uncontrollable rectifier circuit output positive and negative electrode;u1Pn、u1NnFor the voltage difference between P point, N point and n point;
T is the time;0~m is commutation process;Area A1mIntegral result for commutation drop-off voltage.
In the process, from the beginning of the t=0 moment (initial time is optional), electric current is from D15Shift to D11, before this, electric current
i1dFlow through D15And D16。
In commutation process, do not consider that the voltage difference that uncontrollable rectifier circuit diode tube voltage drop, a phase and c are alternate is u1comm=
u1an-u1cn, D15And D11Simultaneously turn on the loop current i in composition loop1m, circuit theory can obtain
As t=m, commutation process terminates, electric current i1mI is increased to from 01d, as shown in Fig. 3 (b), a phase stator inductance voltage
For
u1La=Lsdi1a/ dt=Lsdi1m/dt (3)
In formula, d is differential operator.
If I1dKeep constant in commutation course, then c phase stator inductance voltage is
u1Lc=Lsdi1c/ dt=-Lsdi1m/dt (4)
A phase in equivalent circuit shown in Fig. 3 (a) and c phase composition loop are applied KVL law, and by formula (3) and formula (4)
Can obtain
Arrange above formula further can obtain
Within 0~m commutation time period, above formula both sides integration can be obtained
Generator unit stator line back-emf can be expressed as
Formula (8) is substituted into formula (7), and can be calculated
Arrange further and can obtain
By Fig. 3 (c) it can be seen that have u at the initial time of current commutation1Pn=u1an.In commutation process, i.e. 0 < t is < during m
Between in section, Fig. 3 (c) and formula (6) can obtain
In formula, u1LaEqual to voltage u during commutation1PnFall part, as shown in Fig. 3 (c).The integral result of commutation drop-off voltage
For area A1m, formula (7) can obtain
A1m=ω1LsI1d (12)
The area A fallen1mEvery 60 ° of electrical angles occur once, and therefore uncontrollable rectifier circuit output voltage meansigma methods will reduce, and change
Phase drop-off voltage is
In formula, △ u1dFor commutation drop-off voltage.
Therefore, the uncontrollable rectifier circuit output voltage meansigma methods during each commutation is
In formula, U1d0It it is preferable uncontrollable rectifier circuit output voltage meansigma methods.
I in formula (14)1dWith the relation of electromotor phase current virtual value it is
In formula, I1sFor electromotor phase current virtual value.
Formula (15) is substituted in formula (14), and considers uncontrollable rectifier circuit diode tube voltage drop Vdiode, then uncontrollable rectifier circuit
Output voltage average value is
Formula (1) substitution above formula can be obtained
In like manner, another electromotor also has similar mathematical relationship with uncontrollable rectifier circuit.Thus approximate calculation can go out and not control
Output Voltage in Rectified Circuits meansigma methods.
(3) critical speed ω is determinedmaxAnd ωmin。
Uncontrollable rectifier circuit output voltage meansigma methods and boost chopper output voltage average value can be obtained by boost chopper principle
Between relation be
In formula, d1、d2It is respectively the dutycycle of two boosting power switch pipes.
When two set boost choppers are in series connection, DC capacitor voltage is
Udc=U1dc+U2dc (19)
When two set boost choppers are in parallel connection, DC capacitor voltage is
Udc=U1dc=U2dc (20)
Approximate calculation boosting power switch pipe dutycycle under different rotating speeds, different cascade system can be gone out by formula (1)~(20).
Pre-set boosting power switch pipe dutycycle bound, upper and lower with this for dutycycle under calculated different rotating speeds
Limit value compares, and under series system, when calculated dutycycle is less than lower limit, this rotating speed is i.e. for be cut by series system
Shift to critical speed ω of parallel waymax;Under parallel way, when calculated dutycycle is higher than higher limit, this rotating speed
I.e. for being switched to critical speed ω of series system by parallel waymin。
(4) boosting power switch tube S is regulated respectively1And S2Dutycycle, make electromotor actual speed continuous convergence reference rotation velocity.
Now change of current power switch tube S3In the conduction state, two set boost choppers are operated in series system, DC voltage
Shown in mathematical relationship such as formula (19), S1And S2Dutycycle is bigger.
(5) gradually rise along with two generator speeds, S1And S2Dutycycle constantly reduces, when generator speed rises to critical turn
Speed ωmaxTime, change of current power switch tube S3Disconnecting, two set boost choppers are operated in parallel way, the number of DC voltage
Shown in relation such as formula (20), S1And S2Dutycycle comes back to bigger numerical value.
(6) when electromotor is by during at a high speed to low cruise, S1And S2Dutycycle constantly increases, when generator speed is down to critical turn
Speed ωminTime, change of current power switch tube S3Conducting, two set boost choppers are come back to series system by parallel way, with
Ensure S1And S2Dutycycle is always positioned at suitable numerical value, keeps system stable operation.
Although above in conjunction with figure, invention has been described, but the invention is not limited in above-mentioned detailed description of the invention, on
The detailed description of the invention stated is only schematic rather than restrictive, those of ordinary skill in the art's opening in the present invention
Under showing, without deviating from the spirit of the invention, it is also possible to make many variations, within these belong to the protection of the present invention.
Claims (2)
1. an off-network type wind power system two electromotor cascade progress control method, is characterized in that, realize by means of following system, and comprise the steps;
System is:
Two permanent-magnetic wind driven generators, every generator unit stator connects uncontrollable rectifier circuit;Often set uncontrollable rectifier circuit is followed by a set of boost chopper;Often set boost chopper includes a boost inductance, a boosting power switch pipe and a fast recovery diode, described boost inductance is connected between the input positive pole of this boost chopper and boosting power switch pipe forward conduction input, described fast recovery diode anode is connected with boosting power switch pipe forward conduction input, and negative electrode is connected with the output cathode of this boost chopper;The output cathode of the 1st set boost chopper and the output negative pole of the 2nd set boost chopper are connected with storage capacitor both positive and negative polarity respectively, the outfan of two set boost choppers is connected in series by a change of current power switch pipe, its connected mode is, the output negative pole of the 1st set boost chopper is connected with change of current power switch pipe forward conduction outfan, and the output cathode of the 2nd set boost chopper is connected with change of current power switch pipe forward conduction input;The input negative pole of the 1st set boost chopper and the input negative pole of the 2nd set boost chopper are by a level combination diode D4Connect, this level combination diode D4Negative electrode and the 1st set boost chopper input negative pole connect, anode with the 2nd set boost chopper input negative pole connection;The boosting of the 1st set boost chopper is combined diode D also by a level between the boosting power switch pipe forward conduction input with power switch pipe forward conduction input and the 2nd set boost chopper3Connect, this level combination diode D3The boosting of negative electrode and the 1st set boost chopper connects with power switch pipe forward conduction input, and the boosting power switch pipe forward conduction input Connection Step of anode and the 2nd set boost chopper is:
Step one, by permanent-magnetic wind driven generator principle, and analyze current commutation process, obtaining uncontrollable rectifier circuit output voltage meansigma methods is
In formula, U1d、U2dIt is respectively two set uncontrollable rectifier circuit output voltage meansigma methodss;ω1、ω2It is respectively two generator speeds;I1s、I2sIt is respectively two electromotor phase current virtual values;KeFor back emf coefficient;VdiodeFor uncontrollable rectifier circuit diode tube voltage drop;LsFor generator unit stator phase inductance;
Under step 2, respectively calculating boost chopper series and parallel state, power switch pipe dutycycle is used in boosting
The relation that can be obtained between uncontrollable rectifier circuit output voltage meansigma methods and boost chopper output voltage average value by boost chopper principle is
In formula, U1dc、U2dcIt is respectively two set boost chopper output voltage average values;d1、d2It is respectively the dutycycle of two boosting power switch pipes;
When two set boost choppers are in series connection, DC capacitor voltage is
Udc=U1dc+U2dc
In formula, UdcFor DC capacitor voltage;
When two set boost choppers are in parallel connection, DC capacitor voltage is
Udc=U1dc=U2dc
I.e. approximate calculation the boosting power switch pipe dutycycle under different rotating speeds, different cascade system can be gone out by above formula;
Step 3, hysteresis control method thereof
By dutycycle bound and calculated dutycycle, boosting power switch pipe dutycycle bound in initialization system, determines that state switches critical speed;Dutycycle under calculated different rotating speeds compared with dutycycle bound, under series system, when calculated dutycycle is less than dutycycle lower limit, this rotating speed i.e. for being switched to critical speed ω of parallel way by series systemmax;Under parallel way, when calculated dutycycle is higher than the dutycycle upper limit, this rotating speed i.e. for being switched to critical speed ω of series system by parallel waymin;
When wind speed is relatively low, generator speed compared with slow, terminal voltage is relatively low, make change of current power switch pipe turn on, make system work in series connection, to meet the inverter requirement to DC capacitor voltage;When wind speed raises, generator speed raises, and terminal voltage is higher, and two generator speeds all exceed critical speed ωmaxTime, make change of current power switch pipe turn off, make system work in parallel connection, it is ensured that stablizing of DC capacitor voltage, avoid boosting power switch pipe simultaneously and limit dutycycle occurs;When wind speed reduces, two generator speeds are below critical speed ωminTime, make change of current power switch pipe turn on, make system come back to series connection.
2. off-network type wind power system two electromotor cascade progress control method as claimed in claim 1, is characterized in that, make ωmax>ωminSo that algorithm has stagnant ring function, when wind speed the most frequently vibrates, it is to avoid the situation of frequent switched system series and parallel state.
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CN101854065B (en) * | 2010-06-02 | 2012-05-23 | 天津大学 | Control method of cascade boost chopper |
CN102386631A (en) * | 2011-07-16 | 2012-03-21 | 东北电力大学 | Low-wind-speed-occasion multiple low-capacity unit convergence power generating system and method |
CN103050994A (en) * | 2012-12-31 | 2013-04-17 | 曲阜师范大学 | Scattered rectifying and centralized inverting wind power generation system |
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