CN103117701A - Control method of mechanical elastic energy storing permanent magnet motor group under non-harmonic disturbances - Google Patents
Control method of mechanical elastic energy storing permanent magnet motor group under non-harmonic disturbances Download PDFInfo
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- CN103117701A CN103117701A CN2013100761968A CN201310076196A CN103117701A CN 103117701 A CN103117701 A CN 103117701A CN 2013100761968 A CN2013100761968 A CN 2013100761968A CN 201310076196 A CN201310076196 A CN 201310076196A CN 103117701 A CN103117701 A CN 103117701A
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Abstract
Provided is a control method of a mechanical elastic energy storing permanent magnet motor group under non-harmonic disturbances. The permanent magnet motor group comprises a permanent magnet synchronous motor, a gear gearbox and a volute spring box used for mechanical elastic energy storing. The control method includes that a full system mathematical model including the permanent magnet synchronous motor, the gear gearbox and the volute spring box is constructed, and then non-linear internal model equations and a state feedback controller are designed aiming at nonlinear disturbances generated by a nonlinear external system. According to the control method, the different non-linear internal model equations are designed on the basis of type features of external disturbances, and the state feedback controller is designed on the basis of a nominal system control law. Test results prove that the designed state feedback controller can ensure that angular velocity output by the permanent magnet motor group under various external disturbances is basically stable and enables a closed loop system to fast track reference signals, and high-accuracy servo control of the motor group is achieved.
Description
Technical field
The present invention relates to a kind of method for controlling permanent magnet synchronous motor with mechanical elastic energy storage, belong to technical field of motors.
Background technology
Energy storage technology is for solving the problems such as current new forms of energy networking, peak-frequency regulation, and the assurance electrical network equilibrium of supply and demand, maintenance system are stablized, and all are of great practical significance.At further investigation mechanical whirlpool spring elastic energy storage (Mechanical Elastic Energy Storage, MEES) on the basis of principle, the technical staff has proposed permanent magnetic motor type mechanical elastic energy storage method, permagnetic synchronous motor (permanent magnet synchronous motor, PMSM) having the advantages such as power density is large, efficiency is high, electromagnetic torque is large, volume is little, fast response time, is the optimal selection of the method energy storage unit servo system.Due to the electromechanical coupling characteristics of unit and the nonlinear characteristic of permagnetic synchronous motor (PMSM), one of key technical problem that this energy storage mode need to solve is exactly the nonlinear Control problem of unit.Permanent magnetic motor type mechanical elastic energy storage unit is when storage energy operation, and the continuous variation of whirlpool spring elastic torque and moment of inertia, will cause harmful effect to the performance of servo system.PMSM itself has the characteristics such as non-linear, close coupling and time variation in addition, particularly during the set grid-connection storage energy operation, unit will be subjected to non-linear external disturbance often, and the fixing PID controller adaptability of conventional parameter, by variation, is difficult to meet the control requirement of high accuracy servo system.Therefore, when the permanent-magnet electric unit storage energy operation with mechanical elastic energy storage, design a kind of control method, can guarantee externally under anharmonic humorous wave interference, the rotating speed of permagnetic synchronous motor output keeps substantially constant to have very important significance.
Summary of the invention
The object of the invention is to the drawback for prior art, the control method of the unit of the permanent-magnet electric with mechanical elastic energy storage under a kind of anharmonic humorous wave interference is provided.
Problem of the present invention realizes with following technical proposals:
The unit of the permanent-magnet electric with mechanical elastic energy storage control method under a kind of anharmonic humorous wave interference, described permanent-magnet electric unit comprises permagnetic synchronous motor, speed-changing gear box and is used as the whirlpool spring case of mechanical elastic energy storage, the total system Mathematical Modeling of the permanent-magnet electric unit that described control method model comprises permagnetic synchronous motor, speed-changing gear box and whirlpool spring case, then for by non-linear external system:
(wherein, matrix
,
,
For abundant smooth function, and
) nonlinear disturbance that produces
, design Nonlinear Internal Model equation:
Wherein,
For the signal of external system generation,
For state variable,
For control inputs,
With
Be known smooth vector field,
Be the matrix of a suitable dimension,,
For the Hurwitz matrix,
For nonsingular matrix,
For matrix,
For smooth function,
State feedback controller is designed to:
Wherein,
For the multivariable EVAC (Evacuation Network Computer Model)
Nominal system
State feedback control law,
Wherein:
v 1,
v 2Be respectively and act on
dAxle,
qThe anharmonic humorous interference wave signal of axle,
a,
bFor being greater than zero constant,
A 11,
A 21,
A 12,
A 22For matrix parameter,
,
,
,
,
,
,
,
Be the matrix of certain dimension,
c 1,
c 2,
c 3For constant,
,
For the calm rule of the undisturbed nominal system of former multivariable EVAC (Evacuation Network Computer Model),
,
For smooth function,
F 1,
F 2For the Hurwitz matrix,
q 1,
q 2For matrix parameter,
,
For the nonsingular solution of Sylvester equation,
u 1,
u 2For controlling voltage,
u d ,
u q For DC permanent magnet stator voltage
D, qThe axle component,
ω m Angular speed for motor output;
Control and carry out as follows:
At first, according to the actual operation parameters of permanent magnetic motor type mechanical elastic energy storage unit, determine the total system Mathematical Modeling of unit; According to acting on
dThe anharmonic humorous interference wave signal of axle
v 1, choose
a,
bDetermine matrix parameter
A 11,
A 21, and obtain
,
,
With
According to acting on
qThe anharmonic humorous interference wave signal of axle
v 2, choose a, b determines matrix parameter
A 12,
A 22, and obtain
,
,
With
Choose constant according to the Laypunov function
c 1,
c 2With
c 3, determine the calm rule of the undisturbed nominal system of former multivariable EVAC
With
Selection of Function
With
, determine matrix parameter
With
Choose matrix
F 1, separate the Sylvester equation and obtain matrix
, and combination
Obtain
q 1, choose matrix
F 2, separate the Sylvester equation and obtain matrix
, and combination
Obtain
q 2Will
F 1,
,
,
The Nonlinear Internal Model equation of substitution design, obtain
dThe nonlinear disturbance signal of axle
v 1Estimated value, will
F 2,
,
,
The Nonlinear Internal Model equation of substitution design, obtain
qThe nonlinear disturbance signal of axle
v 2Estimated value; Again by the nonlinear disturbance signal obtained
v 1Estimated value, the calm rule of undisturbed nominal system
, matrix parameter
q 1And function
The state feedback controller that substitution designs in the lump, controlled voltage
u 1,
u d Equally, by the nonlinear disturbance signal obtained
v 2Estimated value, the calm rule of undisturbed nominal system
, matrix parameter
q 2And function
The state feedback controller that substitution designs in the lump, controlled voltage
u 2 ,
u q
Finally, will control voltage
u d With
u q Be input in the total system Mathematical Modeling of permanent-magnet electric unit, just can guarantee the angular speed of permanent-magnet electric unit output under anharmonic humorous wave interference
ω m Keep basicly stable.
The unit of the permanent-magnet electric with mechanical elastic energy storage control method under above-mentioned anharmonic humorous wave interference, the total system Mathematical Modeling of described permanent magnetic motor type mechanical elastic energy storage unit is:
Wherein,
B m For the damping coefficient of motor,
T m ,
T L Be respectively motor output torque and elastic shaft torsional moment,
ω m ,
ω L Be respectively the angular speed of motor and whirlpool spring elastic shaft,
L d ,
L q For
dAxle and
qThe axle inductance,
,
With
,
Be respectively stator current and stator voltage
D, qThe axle component,
For stator resistance,
For rotor velocity,
For rotor flux,
pFor number of pole-pairs,
For rotor moment of inertia,
rFor the gear reduction box gear ratio,
nFor the whirlpool spring number of effective coils;
E,
,
bWith
hBe respectively elastic properties of materials modulus, length, width and the thickness of energy storage whorl reed;
kFor whirlpool spring quality coefficient,
For compact subset,
For the time.
The type feature that the present invention is based on external disturbance carries out the Nonlinear Internal Model design; On the basis of nominal system control law, according to the interior modular equation built, carried out the design of state feedback controller.Result of the test shows, when the unit storage energy operation, even be subject to anharmonic humorous wave interference, closed-loop system is tracking reference signal soon still, guarantees the output speed substantially constant of permanent-magnet electric unit, realizes that the high-precision servo of unit is controlled.
The accompanying drawing explanation
Below in conjunction with accompanying drawing, the invention will be further described.
Fig. 1 is permanent magnetic motor type mechanical elastic energy storage unit total system model;
Fig. 2, Fig. 3 are Nonlinear perturbations input simulations;
Fig. 4, Fig. 5 are the system control inputs;
Fig. 6, Fig. 7, Fig. 8 are system mode output.
In literary composition, each symbol inventory is:
For abundant smooth function,
For nonlinear disturbance,
For the signal of external system generation,
For state variable,
For control inputs,
With
Be known smooth vector field,
Be the matrix of a suitable dimension,
For the Hurwitz matrix,
For nonsingular matrix,
For matrix,
For smooth function,
G i For being defined in
In the non-zero constant vector,
For state feedback control law,
B m For the damping coefficient of motor,
T m ,
T L Be respectively motor output torque and elastic shaft torsional moment,
ω m ,
ω L Be respectively the angular speed of motor and whirlpool spring elastic shaft,
L d ,
L q For
dAxle and
qThe axle inductance,
,
With
,
Be respectively stator current and stator voltage
D, qThe axle component,
For stator resistance,
For rotor velocity,
For rotor flux,
pFor number of pole-pairs,
For rotor moment of inertia,
rFor the gear reduction box gear ratio,
nFor the whirlpool spring number of effective coils;
E,
,
bWith
hBe respectively elastic properties of materials modulus, length, width and the thickness of energy storage whorl reed;
kFor whirlpool spring quality coefficient,
For the time,
V (
x ) be the Lyapunov function.
Embodiment
The present invention is realized by following technical scheme:
1. permanent magnetic motor type mechanical elastic energy storage unit mathematical modeling
As shown in Figure 1, gear reduction box is reduced to multiple degrees of freedom " spring-quality-damping " model to permanent magnetic motor type mechanical elastic energy storage unit total system model, wherein,
B m ,
B L Be respectively the damping coefficient of motor and elastic shaft,
T m ,
T L Be respectively motor output torque and elastic shaft torsional moment,
ω m ,
ω L Be respectively the angular speed of motor and whirlpool spring elastic shaft.
In thermal energy storage process, permagnetic synchronous motor runs on electric motor state, supposes
d,
qThe axle inductance
L d =
L q , so, permanent-magnet servo motor exists
D, qNonlinear mathematical model under the axle rotational coordinates can be written as:
(1)
In formula,
i d ,
i q With
u d ,
u q Be respectively stator current and stator voltage
D, qThe axle component,
R s For stator resistance,
For rotor velocity,
For rotor flux,
pFor number of pole-pairs,
J m For rotor moment of inertia.
Suppose that the gear reduction box gear ratio is
r, ignore the gearbox power loss, the moment of reduction box both sides, angular speed relational expression can be expressed as:
If whirlpool spring tail end adopts fixed form, according to GB " plane scroll spring designing and calculating (JB/T7366-1994) ", whirlpool, square-section spring moment of torsion can be written as:
Wherein:
nFor the whirlpool spring number of effective coils;
E,
l,
bWith
hBe respectively elastic properties of materials modulus, length, width and the thickness of energy storage whorl reed;
kFor whirlpool spring quality coefficient.
While supposing normal operation, energy-storage box main shaft and PMSM work in permanent rotating speed state, known whirlpool spring elastic shaft angular speed
ω L With the whirlpool spring number of effective coils
nPass be:
(4)
Formula (4) substitution formula (3) can be obtained, and the pass of whirlpool spring moment of torsion and its angular speed is:
From formula (5), in theory, once angular speed
ω L Constant, whirlpool spring elastic torque and time will present linear relationship.
The differential equation (1) has just formed permanent magnetic motor type mechanical elastic energy storage unit total system Mathematical Modeling in conjunction with equation (2) and (5).
2. control problem is described
Consider the multivariable EVAC (Evacuation Network Computer Model)
Wherein, state variable
, control inputs
,
With
Be known smooth vector field,
For the nonlinear disturbance of input,
Signal for external system produces is produced by following non-linear external system:
If do not consider the Nonlinear perturbations input, the nominal system of system (6) can be written as:
(8)
For the stability problem of multivariable input system, key is the stability problem that is translated into a plurality of single input systems.
Suppose that 1 for system (8), existence Feedback Control Laws
, make the nominal closed-loop system
Progressive stable at initial point, thereby have the Lyapunov function
V (
x ) meet:
The vector field path of supposing 2 non-linear external systems (7) is bounded.
Annotating 1 non linear system that meets hypothesis 2 has the limit cycle etc. of harmonic function or nonlinear dynamic system, and the non-linear external system that the present invention considers is by Zhiyong Chen and Jie Huang(" Robust output regulation with nonlinear exosystem ".Automatica, 2005,41 (8): 1447-1454.) propose:
Wherein, matrix
,
,
For abundant smooth function, and
, the system that meets (10) has a lot, and the present invention chooses famous Van der Pol oscillator, and it is expressed as
Wherein,
a,
bBe the constant that is greater than zero, now, Van der Pol oscillator will produce stable limit cycle, (11) will be written as to the form of (10), have
Wherein
,
LFor the Lie derivatives operator, obviously, if
For
Linear representation, suppose that 3 meet automatically.
Problem to be solved by this invention can be described as: for any given compact subset
, all can find state feedback controller
, make under arbitrary initial conditions, for all
With all
t>=0, the solution of closed-loop system (6) exists and bounded, and
.
3. Nonlinear Internal Model design
The purpose of design Nonlinear Internal Model is that inhibition is inputted and disturbed to the outside Nonlinear perturbations of estimation.
Order
For setting up the Nonlinear Internal Model equation, make the following assumptions
(17)
Based on Systems with Linear Observation device theory, for non-zero constant vector in (14)
G i , choose the Hurwitz matrix
F i Make matrix to (
F i ,
G i ) controlled.Due to matrix pair
Considerable, and
F i With
There is disjoint frequency spectrum, therefore the Sylvester equation
There is unique nonsingular solution
.
For this reason, the design Nonlinear Internal Model is as follows:
If auxiliary error
e i For
(22)
Along equation (6), (20) and (21), to formula (22) differentiate, can obtain
4. state feedback controller design
Even the effect of design point feedback controller is to guarantee to exist in the situation of external disturbance, closed-loop system still can progressive tracking reference signal.For the purpose of the present invention, to guarantee exactly under anharmonic humorous wave interference, make permanent-magnet electric unit output speed keep basicly stable.
Nonlinear Internal Model (21) based on building and suppose 1, the design point feedback controller is:
Structure Lyapunov function
Wherein
For positive real constant, along system (6) and auxiliary error (23) to function
WDifferentiate, obtain
Suppose to exist and compact
, for all
,
The symmetrical matrix of negative definite, so, for all
, have arithmetic number
f, make
By (27) and (28) substitutions (26), can obtain
So, have
Therefore all variablees are bounded.In conjunction with the invariant set theorem, just can obtain
With
.Thereby obtain following conclusion: for meeting nonlinear multivariable systems (6) and the external system (7) of hypothesis 1 to hypothesis 5, Nonlinear Internal Model (21) and control inputs (24) can make the closed-loop system global bounded, and
.
To 0.018kWh/1.1kW permanent magnetic motor type mechanical elastic energy storage unit experiment Analysis.The unit relevant parameters is: the motor nominal torque
T e =5.0Nm,
p=4,
=0.18Wb,
R s =1.95 Ω,
L d =
L q =0.0115H,
J m =0.008kgm
2,
r=40:1,
ω L =15r/min,
B m =0.01N/rad/s.
After considering Nonlinear perturbations, permanent magnetic motor type mechanical elastic energy storage unit total system Mathematical Modeling is converted into to formula (6) form of expression, the results are shown in formula (32).Visible, this unit is two variable input systems, adopts single input algorithm to be processed.
For simplicity, non-linear external disturbance input
v 1With
v 2Van der Pol oscillator by formula (11) produces, and gets
, have
,
(due to
For convenience, therefore order
),
, now, this oscillator will produce the limit cycle of bounded, suppose 2 establishments.
Suppose
c 1,
c 2With
c 3Be certain normal number, get control law
Wherein,
For the rotor reference rotation velocity, be taken as 600r/min, can verify that undisturbed nominal system (8) can quilt
Calm.
Order
Calculate and arrange,
If
(37)
Suppose 1 establishment.
Choose
{。##.##1},
Meet hypothesis 4.
If
v 1With
v 2Act on respectively
d,
qOn axle,
v 1=
w 1,
v 2=
w 2, characterization system has been injected into different nonlinear disturbance signals, when
v 1=
w 1The time, through calculating:
When
v 2=
w 2The time, through calculating:
According to (42), order
According to (43), order
(45)
(47)
So, suppose 5 establishments.
Below empirical tests system (32) and (11) meet required all conditions, the nonlinear control method proposed based on the present invention, design Nonlinear Internal Model and state feedback controller are as follows:
(52)
Utilize Matlab software to carry out numerical simulation, simulation step length Qu ⊿
t=0.001s, the system initial condition is:
,
With
, simulation result accompanying drawing 2 is to Fig. 8.Fig. 4 and Fig. 5 are the control voltage input that comprises internal mold
u 1With
u 2 ,
u d With
u q , this voltage is the control variables be injected in permanent-magnet electric unit total system Mathematical Modeling; Fig. 6 shows the output of permanent-magnet electric unit
dShaft current
i d =0; Fig. 7 is the rotating speed of permanent magnet motor output shaft
ω m , substantially constant is in 600r/min; Fig. 8 is the output of permanent-magnet electric unit
qShaft current
i q ,
i q Along with the increase of spring moment of torsion in whirlpool in thermal energy storage process constantly increases.Fig. 7 shows under the multiclass external disturbance, and the state feedback controller of the present invention's design can guarantee that the permanent-magnet electric unit exports permanent rotating speed.Simulation result shows, closed-loop system has realized the progressive tracking to reference signal soon, and therefore, the multivariable controller of the present invention's design can effectively suppress external disturbance, and guarantees permanent-magnet electric unit output speed substantially constant.
Claims (2)
1. the unit of the permanent-magnet electric with the mechanical elastic energy storage control method under an anharmonic humorous wave interference, it is characterized in that, described permanent-magnet electric unit comprises permagnetic synchronous motor, speed-changing gear box and is used as the whirlpool spring case of mechanical elastic energy storage, the total system Mathematical Modeling of the permanent-magnet electric unit that described control method model comprises permagnetic synchronous motor, speed-changing gear box and whirlpool spring case, then for by non-linear external system:
, wherein, matrix
,
,
For abundant smooth function, and
, the nonlinear disturbance of generation
, design Nonlinear Internal Model equation:
,
Wherein,
For the signal of external system generation,
For state variable,
For control inputs,
With
Be known smooth vector field,
Be the matrix of a suitable dimension,
For the Hurwitz matrix,
For nonsingular matrix,
For matrix,
For smooth function,
State feedback controller is designed to:
Wherein,
For the multivariable EVAC (Evacuation Network Computer Model)
Nominal system
State feedback control law,
Wherein:
v 1,
v 2Be respectively and act on
dAxle,
qThe anharmonic humorous interference wave signal of axle,
a,
bFor being greater than zero constant,
A 11,
A 21,
A 12,
A 22For matrix parameter,
,
,
,
,
,
,
,
Be the matrix of certain dimension,
c 1,
c 2,
c 3For constant,
,
For the calm rule of the undisturbed nominal system of former multivariable EVAC (Evacuation Network Computer Model),
,
For smooth function,
F 1,
F 2For the Hurwitz matrix,
q 1,
q 2For matrix parameter,
,
For the nonsingular solution of Sylvester equation,
u 1,
u 2For controlling voltage,
u d ,
u q For DC permanent magnet stator voltage
D, qThe axle component,
ω m Angular speed for motor output;
Control and carry out as follows:
At first, according to the actual operation parameters of permanent magnetic motor type mechanical elastic energy storage unit, determine the total system Mathematical Modeling of unit; According to acting on
dThe anharmonic humorous interference wave signal of axle
v 1, choose a, b determines matrix parameter
A 11,
A 21, and obtain
,
,
With
According to acting on
qThe anharmonic humorous interference wave signal of axle
v 2, choose a, b determines matrix parameter
A 12,
A 22, and obtain
,
,
With
Choose constant according to the Laypunov function
c 1,
c 2With
c 3, determine the calm rule of undisturbed nominal system
With
Selection of Function
With
, determine matrix parameter
With
Choose matrix
F 1, separate the Sylvester equation and obtain matrix
, and combination
Obtain
q 1, choose matrix
F 2, separate the Sylvester equation and obtain matrix
, and combination
Obtain
q 2Will
F 1,
,
,
The Nonlinear Internal Model equation of substitution design, obtain
dThe nonlinear disturbance signal of axle
v 1Estimated value, will
F 2,
,
,
The Nonlinear Internal Model equation of substitution design, obtain
qThe nonlinear disturbance signal of axle
v 2Estimated value; Again by the nonlinear disturbance signal obtained
v 1Estimated value, the calm rule of undisturbed nominal system
, matrix parameter
q 1And function
The state feedback controller that substitution designs in the lump, controlled voltage
u 1,
u d Equally, by the nonlinear disturbance signal obtained
v 2Estimated value, the calm rule of undisturbed nominal system
, matrix parameter
q 2And function
The state feedback controller that substitution designs in the lump, controlled voltage
u 2 ,
u q
Finally, will control voltage
u d With
u q Be input in the total system Mathematical Modeling of permanent-magnet electric unit, just can guarantee the angular speed of permanent-magnet electric unit output under anharmonic humorous wave interference
ω m Keep basicly stable.
2. the unit of the permanent-magnet electric with the mechanical elastic energy storage control method under a kind of anharmonic humorous wave interference according to claim 1, is characterized in that, the total system Mathematical Modeling of described permanent magnetic motor type mechanical elastic energy storage unit is:
Wherein,
B m , be the damping coefficient of motor,
T m ,
T L Be respectively motor output torque and elastic shaft torsional moment,
ω m ,
ω L Be respectively the angular speed of motor and whirlpool spring elastic shaft,
L d ,
L q For
dAxle and
qThe axle inductance,
,
With
,
Be respectively stator current and stator voltage
D, qThe axle component,
For stator resistance,
For rotor velocity,
For rotor flux,
pFor number of pole-pairs,
For rotor moment of inertia,
rFor the gear reduction box gear ratio,
nFor the whirlpool spring number of effective coils;
E,
,
bWith
hBe respectively elastic properties of materials modulus, length, width and the thickness of energy storage whorl reed;
kFor whirlpool spring quality coefficient,
For compact subset,
For the time.
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Cited By (3)
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CN103684170A (en) * | 2013-11-26 | 2014-03-26 | 福州大学 | Secant-method based internal model position control method for permanent magnet linear synchronous motor |
CN104935229A (en) * | 2015-04-03 | 2015-09-23 | 华北电力大学(保定) | Method of obtaining energy storage volute spiral spring real-time rotational inertia |
CN105932922A (en) * | 2016-06-20 | 2016-09-07 | 华北电力大学(保定) | Control method for permanent magnet synchronous generator for mechanical elastic energy storage |
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CN101860294A (en) * | 2010-04-08 | 2010-10-13 | 西北工业大学 | Method for removing chattering of sliding mode control of permanent magnet synchronous motor |
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CN101860294A (en) * | 2010-04-08 | 2010-10-13 | 西北工业大学 | Method for removing chattering of sliding mode control of permanent magnet synchronous motor |
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Cited By (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN103684170A (en) * | 2013-11-26 | 2014-03-26 | 福州大学 | Secant-method based internal model position control method for permanent magnet linear synchronous motor |
CN104935229A (en) * | 2015-04-03 | 2015-09-23 | 华北电力大学(保定) | Method of obtaining energy storage volute spiral spring real-time rotational inertia |
CN104935229B (en) * | 2015-04-03 | 2017-12-12 | 华北电力大学(保定) | The acquisition methods of the real-time rotary inertia of energy storage volute spring |
CN105932922A (en) * | 2016-06-20 | 2016-09-07 | 华北电力大学(保定) | Control method for permanent magnet synchronous generator for mechanical elastic energy storage |
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