CN110336503B - Control method and device of double-fed motor under power grid depth asymmetric working condition - Google Patents
Control method and device of double-fed motor under power grid depth asymmetric working condition Download PDFInfo
- Publication number
- CN110336503B CN110336503B CN201910514058.0A CN201910514058A CN110336503B CN 110336503 B CN110336503 B CN 110336503B CN 201910514058 A CN201910514058 A CN 201910514058A CN 110336503 B CN110336503 B CN 110336503B
- Authority
- CN
- China
- Prior art keywords
- given value
- axis component
- coordinate system
- component
- synchronous rotation
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
- 238000000034 method Methods 0.000 title claims abstract description 26
- 230000001360 synchronised effect Effects 0.000 claims abstract description 177
- 230000002441 reversible effect Effects 0.000 claims abstract description 37
- 238000004364 calculation method Methods 0.000 claims description 25
- 238000006243 chemical reaction Methods 0.000 claims description 16
- 239000000126 substance Substances 0.000 claims description 14
- 230000003068 static effect Effects 0.000 claims description 7
- 238000011217 control strategy Methods 0.000 abstract description 2
- 238000010586 diagram Methods 0.000 description 10
- 238000004590 computer program Methods 0.000 description 7
- 238000004088 simulation Methods 0.000 description 7
- 230000006870 function Effects 0.000 description 5
- 238000012545 processing Methods 0.000 description 4
- 230000000694 effects Effects 0.000 description 3
- 230000004907 flux Effects 0.000 description 3
- 230000008569 process Effects 0.000 description 3
- 230000000903 blocking effect Effects 0.000 description 2
- 238000006880 cross-coupling reaction Methods 0.000 description 2
- 238000007789 sealing Methods 0.000 description 2
- 238000012360 testing method Methods 0.000 description 2
- 238000004458 analytical method Methods 0.000 description 1
- 230000005284 excitation Effects 0.000 description 1
- 238000001914 filtration Methods 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000003287 optical effect Effects 0.000 description 1
- 238000012795 verification Methods 0.000 description 1
Images
Classifications
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J3/00—Circuit arrangements for ac mains or ac distribution networks
- H02J3/18—Arrangements for adjusting, eliminating or compensating reactive power in networks
- H02J3/1885—Arrangements for adjusting, eliminating or compensating reactive power in networks using rotating means, e.g. synchronous generators
-
- 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
- H02P21/0003—Control strategies in general, e.g. linear type, e.g. P, PI, PID, using robust control
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E40/00—Technologies for an efficient electrical power generation, transmission or distribution
- Y02E40/30—Reactive power compensation
Landscapes
- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Control Of Ac Motors In General (AREA)
Abstract
The invention discloses a method and a device for controlling a double-fed motor under the condition of power grid depth asymmetry, wherein a double-closed loop vector control strategy is adopted, an outer loop controls active power and reactive power, an inner loop controls rotor current, a double-sequence phase-locked loop is utilized to separate positive and negative sequence components of grid voltage, a rotor current negative sequence set value can be obtained by directly changing negative sequence rotor voltage to zero according to a steady-state equation of the double-fed motor rotor voltage under a reverse synchronous coordinate system, and the rotor negative sequence voltage is reduced by controlling the rotor negative sequence current, so that the rotor voltage amplitude is reduced to be within the controlled range of a machine side converter. The invention further widens the asymmetric operation range of the double-fed machine side converter, and the machine side converter can still be in a controlled state to output active power and support the power grid in a reactive mode under the condition of asymmetric depth of the power grid.
Description
Technical Field
The invention relates to a control method and a control device of a double-fed motor under the condition of asymmetric power grid depth, and belongs to the technical field of motor control.
Background
Most of the grid faults are asymmetric faults. When the grid voltage is asymmetric, the positive sequence rotor voltage amplitude is approximately in slip-fold relationship with the positive sequence stator voltage amplitude, and the negative sequence rotor voltage amplitude is approximately (2-slip) -fold relationship with the negative sequence stator voltage amplitude, regardless of the influence of the rotor current. In actual operation, the slip ratio range of the doubly-fed motor is generally-0.2, so that a smaller negative sequence component on the stator voltage is reflected on the rotor and can be greatly increased. And as the unbalance degree of the power grid voltage is increased, the negative sequence voltage of the stator is increased, and the negative sequence voltage of the rotor is increased more. Therefore, when the asymmetry degree of the voltage of the power grid is high, the voltage of the rotor is too high and exceeds the voltage controlled range of the converter, and the traditional double-fed machine side converter usually adopts a pulse sealing mode to ensure that a converter controller is not out of control. Therefore, the machine side converter completely loses the current control capability, and the rotor voltage injects energy to the direct current side in an uncontrolled rectification mode, so that the direct current side energy release resistor is repeatedly switched.
Therefore, the asymmetric operation range of the double-fed machine-side converter needs to be further widened, and under the condition of asymmetric depth of the power grid, the machine-side converter can still be in a controlled state, active power output is carried out, and reactive power support is carried out on the power grid.
Disclosure of Invention
The invention aims to provide a control method and a control device of a double-fed motor under the condition of power grid depth asymmetry, the method can further widen the asymmetric operation range of a double-fed machine side converter, and the machine side converter can still be in a controlled state to carry out active output and reactive support on a power grid even under the condition of power grid depth asymmetry, and is easy for engineering realization.
In order to achieve the purpose, the technical scheme adopted by the invention is as follows:
a control method of a doubly-fed motor under the condition of asymmetric grid depth comprises the following steps:
(1) obtaining a stator active given value, a stator reactive given value, a stator active and a stator reactive of the doubly-fed motor;
(2) calculating a d-axis component given value of a rotor current positive sequence component in a forward synchronous rotation dq + coordinate system according to the stator active given value and the stator active; calculating a q-axis component given value of a rotor current positive sequence component in a forward rotation synchronous rotation dq + coordinate system according to the stator reactive given value and the stator reactive given value;
(3) acquiring power grid voltage, and separating positive and negative sequence components of the power grid voltage to obtain a d-axis component and a q-axis component of a negative sequence component of the stator voltage in a reverse synchronous rotation dq-coordinate system, and a positive sequence component angle and a negative sequence component angle of the power grid voltage;
(4) calculating a d-axis component given value and a q-axis component given value of the negative sequence component of the rotor current in a reverse synchronous rotation dq-coordinate system according to the d-axis component and the q-axis component of the negative sequence component of the stator voltage in the reverse synchronous rotation dq-coordinate system;
(5) calculating a d-axis component given value and a q-axis component given value of the rotor current negative sequence component in a forward rotation synchronous rotation dq + coordinate system according to the d-axis component given value and the q-axis component given value of the rotor current negative sequence component in a reverse rotation synchronous rotation dq-coordinate system and a positive sequence component angle and a negative sequence component angle of the grid voltage;
(6) calculating a total d-axis component given value and a total q-axis component given value of the rotor current in a forward synchronous rotation dq + coordinate system according to the d-axis component given value and the q-axis component given value of the rotor current positive sequence component in the forward synchronous rotation dq + coordinate system and the d-axis component given value and the q-axis component given value of the rotor current negative sequence component in the forward synchronous rotation dq + coordinate system;
(7) calculating a d-axis component given value and a q-axis component given value of a rotor control voltage in a forward synchronous rotation dq + coordinate system according to the d-axis component total given value and the q-axis component total given value of the rotor current in the forward synchronous rotation dq + coordinate system and the d-axis component and the q-axis component of the rotor current in the forward synchronous rotation dq + coordinate system;
(8) and calculating the alpha-axis component given value and the beta-axis component given value of the rotor control voltage in a two-phase stationary coordinate system according to the d-axis component given value and the q-axis component given value of the rotor control voltage in a forward synchronous rotation dq + coordinate system and the positive sequence component angle of the power grid voltage.
The foregoing d-axis component given value and q-axis component given value in the forward synchronous rotation dq + coordinate system for calculating the rotor current positive sequence component includes:
calculating the deviation between the stator active given value and the stator active given value, and sending the deviation to a proportional integral controller PI to obtain a d-axis component given value of a rotor current positive sequence component in a forward rotation synchronous rotation dq + coordinate system; and calculating the deviation between the stator reactive given value and the stator reactive given value, and sending the deviation into a proportional integral controller PI to obtain a q-axis component given value of the rotor current positive sequence component in a forward rotation synchronous rotation dq + coordinate system.
The positive and negative sequence components of the grid voltage are separated by the double-sequence phase-locked loop DSRPLL.
The foregoing d-axis component given value and q-axis component given value in the reverse synchronous rotation dq-coordinate system for calculating the rotor current negative sequence component includes:
wherein the content of the first and second substances,
and
a d-axis component given value and a q-axis component given value of a rotor current negative sequence component in a reverse synchronous rotation dq-coordinate system are set,
and
for the d-axis and q-axis components, ω, of the negative sequence component of the stator voltage in the inverted synchronous rotation dq-coordinate system0Electrical frequency, L, corresponding to the angular frequency of the positive sequence of the stator currentlsAnd LlrThe leakage inductance of the stator and the leakage inductance of the rotor of the doubly-fed motor are obtained.
The foregoing d-axis component given value and q-axis component given value in the positive rotation synchronous rotation dq + coordinate system for calculating the negative sequence component of the rotor current includes:
wherein the content of the first and second substances,
and
for d component given value and q axis component given value of rotor current negative sequence component in positive rotation synchronous rotation dq + coordinate systemu+And thetau-The positive sequence component angle and the negative sequence component angle of the grid voltage.
The foregoing method for calculating a total d-axis component given value and a total q-axis component given value of a rotor current in a forward synchronous rotation dq + coordinate system includes:
superposing a d-axis component given value of the rotor current positive sequence component in a forward synchronous rotation dq + coordinate system and a d-axis component given value of the rotor current negative sequence component in the forward synchronous rotation dq + coordinate system to obtain a d-axis component total given value of the rotor current in the forward synchronous rotation dq + coordinate system; and superposing the q-axis component given value of the rotor current positive sequence component in the forward synchronous rotation dq + coordinate system and the q-axis component given value of the rotor current negative sequence component in the forward synchronous rotation dq + coordinate system to obtain the q-axis component total given value of the rotor current in the forward synchronous rotation dq + coordinate system.
The foregoing d-axis component given value and q-axis component total given value of the calculated rotor control voltage in the forward synchronous rotation dq + coordinate system includes:
the total d-axis component given value of the rotor current in the forward synchronous rotation dq + coordinate system is subtracted from the d-axis component of the rotor current in the forward synchronous rotation dq + coordinate system, and the difference is sent to a proportional-integral controller and a resonant controller PIR to obtain the d-axis component given value of the rotor control voltage in the forward synchronous rotation dq + coordinate system; and (3) making a difference between the total given value of the q-axis component of the rotor current in the forward synchronous rotation dq + coordinate system and the q-axis component of the rotor current in the forward synchronous rotation dq + coordinate system, and sending the difference to a proportional-integral controller and a resonant controller PIR to obtain the given value of the q-axis component of the rotor control voltage in the forward synchronous rotation dq + coordinate system.
The foregoing method for calculating the α -axis component set value and the β -axis component set value of the rotor control voltage in the two-phase stationary coordinate system includes:
wherein the content of the first and second substances,
and
for a d-axis component given value and a q-axis component given value of a rotor control voltage in a forward synchronous rotation dq + coordinate system,
and
for the rotor control voltage in the two-phase stationary coordinate system alpha axis component given value and beta axis component given value, thetau+Is the angle of the positive sequence component of the network voltage.
A control device of a double-fed motor under the condition of asymmetrical power grid depth comprises: the system comprises a parameter acquisition module, a rotor current positive sequence component given value calculation module, a stator voltage negative sequence component acquisition module, a rotor current negative sequence component given value calculation module, a rotor current negative sequence component given value conversion module, a rotor current total given value calculation module, a rotor control voltage given value calculation module and a rotor control voltage coordinate conversion module;
the parameter acquisition module is used for acquiring an active set value, a reactive set value, an active and a reactive of a stator of the doubly-fed motor;
the rotor current positive sequence component given value calculating module is used for calculating a d-axis component given value of the rotor current positive sequence component in a positive rotation synchronous rotation dq + coordinate system according to the stator active given value and the stator active; and the controller is used for calculating a q-axis component given value of a rotor current positive sequence component in a forward rotation synchronous rotation dq + coordinate system according to the stator reactive given value and the stator reactive;
the stator voltage negative sequence component acquisition module is used for acquiring the power grid voltage and separating positive and negative sequence components of the power grid voltage to obtain a d-axis component and a q-axis component of the stator voltage negative sequence component in a reverse synchronous rotation dq-coordinate system and a positive sequence component angle and a negative sequence component angle of the power grid voltage;
the rotor current negative sequence component given value calculating module is used for calculating a d-axis component given value and a q-axis component given value of a rotor current negative sequence component in a reverse synchronous rotation dq-coordinate system according to a d-axis component and a q-axis component of the stator voltage negative sequence component in the reverse synchronous rotation dq-coordinate system;
the rotor current negative sequence component given value conversion module is used for calculating a d-axis component given value and a q-axis component given value of a rotor current negative sequence component in a forward rotation synchronous rotation dq + coordinate system according to the d-axis component given value and the q-axis component given value of the rotor current negative sequence component in a reverse rotation synchronous rotation dq-coordinate system and a positive sequence component angle and a negative sequence component angle of a grid voltage;
the rotor current total given value calculation module is used for calculating a d-axis component total given value and a q-axis component total given value of the rotor current in a forward synchronous rotation dq + coordinate system according to the d-axis component given value and the q-axis component given value of the rotor current positive sequence component in the forward synchronous rotation dq + coordinate system and the d-axis component given value and the q-axis component given value of the rotor current negative sequence component in the forward synchronous rotation dq + coordinate system;
the rotor control voltage given value calculation module is used for calculating a d-axis component given value and a q-axis component given value of a rotor control voltage in a forward synchronous rotation dq + coordinate system according to the d-axis component total given value and the q-axis component total given value of the rotor current in the forward synchronous rotation dq + coordinate system and the d-axis component and the q-axis component of the rotor current in the forward synchronous rotation dq + coordinate system;
the rotor control voltage coordinate conversion module is used for calculating an alpha axis component given value and a beta axis component given value of the rotor control voltage in a two-phase static coordinate system according to a d axis component given value and a q axis component given value of the rotor control voltage in a forward rotation synchronous rotation dq + coordinate system and a power grid voltage positive sequence component angle.
Compared with the prior art, the invention has the following advantages:
(1) according to the invention, the negative sequence current of the rotor is controlled to reduce the negative sequence voltage of the rotor, so that the amplitude of the voltage of the rotor is reduced to the controlled range of the machine side converter, the asymmetric operation range of the double-fed machine side converter is further widened, and the machine side converter can still be in a controlled state to carry out active power output and carry out reactive power support on a power grid under the condition of asymmetric depth of the power grid.
(2) The invention is simple and easy in engineering implementation process.
Drawings
Fig. 1 is a block diagram of asymmetric drop control of a doubly-fed motor according to the present invention.
Fig. 2 is a graph of simulation results of the machine-side converter blocking pulses under the 20% asymmetric drop condition in the embodiment of the invention.
Fig. 3 is a simulation result of increasing negative-sequence current control of a rotor under a 20% asymmetric drop condition in the embodiment of the present invention.
FIG. 4 shows a 20% asymmetric low-penetration test waveform for a doubly-fed wind farm in an embodiment of the present invention; fig. 4(a) shows three-phase instantaneous values of the stator voltage, fig. 4(b) shows three-phase instantaneous values of the stator current, and fig. 4(c) shows three-phase instantaneous values of the rotor current.
Detailed Description
The invention is further described below. The following examples are only for illustrating the technical solutions of the present invention more clearly, and the protection scope of the present invention is not limited thereby.
Defining the stator current and the rotor current to flow into the motor as positive directions, and in a coordinate system of forward rotation and reverse rotation synchronous rotation dq + and dq-, the positive and negative sequence components of the rotor voltage of the doubly-fed motor can be expressed as follows:
wherein the content of the first and second substances,
Rs、Rr、Ls、Lr、Lmand sigma represents stator resistance, rotor resistance, stator inductance, rotor inductance, excitation inductance and magnetic leakage coefficient of the double-fed motor;
ωslip+、ωslip-the slip frequency of the doubly-fed motor in a positive and negative synchronous rotating coordinate system is represented as follows:
ω0、ωrthe electrical frequency corresponding to the stator current positive sequence angular frequency and the rotor mechanical angular frequency is shown.
The positive and negative sequence components of the stator voltage can be expressed as:
the slip s of the doubly fed machine can be expressed as:
simultaneous formulas (1), (4) and (5) are obtained, dynamic changes of rotor current and stator flux linkage and stator resistance are ignored, and positive and negative sequence components of rotor voltage are respectively as follows under the condition of unbalanced grid voltage:
the positive and negative sequence component amplitudes of the rotor voltage are respectively:
when the degree of asymmetry of a power grid is small, the existing doubly-fed machine-side converter generally adopts stator current balance or rotor current balance or torque stability and the like as a control target. At this time, due to the rotor resistance RrAnd the magnetic leakage coefficient sigma of the generator is relatively small, the given value of the negative sequence current is also relatively small, the resistance voltage drop and the cross coupling term of the rotor in the formula can be ignored, and at the moment, the positive and negative sequence component amplitude of the rotor voltage of the motor can be expressed as follows under the condition of asymmetric stator voltage:
in the above formula, Us+、Us-The amplitudes of the positive and negative sequence components of the stator voltage are respectively.
The stator voltage positive and negative sequence component magnitudes can be calculated according to equation (9).
Therefore, neglecting the rotor resistance voltage drop and the cross-coupling term in the above equation, the rotor voltage amplitude under the unbalanced grid condition can be expressed as:
from the above equation, it can be seen that the positive sequence rotor voltage amplitude is approximately (2-s) times the positive sequence stator voltage amplitude and the negative sequence rotor voltage amplitude is approximately (2-s) times the negative sequence stator voltage amplitude, regardless of the rotor current effects. In actual operation, the slip ratio of the doubly-fed motor is generally in the range of-0.2 to 0.2, i.e., | s | <1, | s-2| > 1. That is, the small negative sequence component of the stator voltage appearing on the rotor is greatly increased. And as the unbalance degree of the power grid voltage is increased, the negative sequence voltage of the stator is increased, and the amplitude of the negative sequence voltage of the rotating speed is larger.
Based on the analysis, for the traditional double-fed converter, when the power grid voltage asymmetry is high, the rotor voltage is too high and exceeds the controlled range of the converter voltage, and the converter side converter usually adopts a pulse sealing mode to ensure that the converter controller is not out of control.
In order to further widen the asymmetric operation range of the double-fed machine-side converter, the invention provides a method for reducing the negative sequence voltage of a rotor by using the negative sequence current of the rotor, so that the double-fed machine-side converter can reliably operate under larger asymmetry. In this way, even under the condition of asymmetric depth of the power grid, the machine side converter can still be in a controlled state, and can output active power and support the power grid in a reactive mode.
The given value of the negative sequence current of the rotor can directly control the negative sequence rotor voltage to be zero. According to the formula (6), the negative sequence voltage of the rotor is controlled to be zero, i.e. to make
And
zero, so that the rotor voltage is necessarily in a voltage controlled range without considering the high voltage, and after neglecting the rotor resistance voltage drop, the rotorThe current negative sequence component should satisfy:
substituting the equations (3) and (5) into the above equation, the negative sequence dq component of the rotor current is:
in the formula, Lls、LlrThe leakage inductance of the stator and the rotor of the doubly-fed motor is represented, and the relation between the inductance of the stator and the rotor and the leakage inductance is as follows:
the asymmetric drop control block diagram of the doubly-fed motor is shown in the attached figure 1. In FIG. 1, θu+、θu-Respectively forming positive and negative sequence component angles of the power grid voltage; p, Q are active and reactive of the stator respectively; p*、Q*Respectively setting active and reactive values of the stator;
respectively setting values of d-axis components and q-axis components of the rotor current positive sequence components in a positive rotation synchronous rotation dq + coordinate system;
respectively setting values of d and q axis components of a rotor current negative sequence component in a reverse synchronous rotation dq-coordinate system;
respectively setting values of d-axis components and q-axis components of the negative sequence components of the rotor current in a forward rotation synchronous rotation dq + coordinate system;
respectively setting values of d-axis components and q-axis components of the rotor current positive sequence components in a positive rotation synchronous rotation dq + coordinate system;
respectively representing d-axis components and q-axis components of the rotor current in a forward rotation synchronous rotation dq + coordinate system;
respectively setting values of d and q axis components of the rotor control voltage in a forward rotation synchronous rotation dq + coordinate system;
respectively setting alpha and beta axis components of the rotor control voltage in a two-phase static coordinate system; DSRPLL is a dual-order phase-locked loop; PI is a proportional integral controller; PIR is proportional integral controller plus resonance controller.
The control structure is based on a vector control strategy of double closed loops, the outer loop controls active power and reactive power, and the inner loop controls rotor current. And separating the positive sequence component and the negative sequence component of the network voltage by using a double-sequence phase-locked loop, thereby calculating to obtain a given value of the negative sequence component of the rotor, and converting the given value of the negative sequence component of the rotor into a positive sequence rotating coordinate system, wherein at the moment, the given value of the negative sequence component of the rotor is expressed as 2-frequency multiplication alternating current. In order to control the negative sequence current, the inner loop controller needs to superimpose 2 times of resonance controller.
The control steps are as follows:
(1) stator active given value P*And the deviation of the stator active power P is obtained through a proportional integral controller PI, and a d-axis given value of a rotor current positive sequence component in a forward rotation synchronous rotation dq + coordinate system is obtained
Stator reactive given value Q*And the deviation of the stator reactive Q is subjected to proportional integral controller PI to obtain a Q-axis given value of a rotor current positive sequence component in a forward rotation synchronous rotation dq + coordinate system
(2) Separating positive and negative sequence components of the power grid voltage by using a double-sequence phase-locked loop DSRPL to obtain d-axis and q-axis components of the negative sequence component of the stator voltage in a reverse synchronous rotation dq-coordinate system
And
and positive and negative sequence component angles of the grid voltage; then, the given values of the d-axis component and the q-axis component of the negative sequence component of the rotor current in a reverse synchronous rotation dq-coordinate system are obtained by calculation through a formula (12)
And
(3) converting the given values of the d and q axis components of the rotor current negative sequence component under the reverse rotation synchronous rotation dq-coordinate system to the forward rotation synchronous rotation dq + coordinate system to obtain
And
the conversion process is as follows:
wherein the content of the first and second substances,
(4) enabling the rotor current positive sequence component obtained in the step (1) to be in a positive rotation synchronous rotation dq + coordinate systemd axis set point
And (4) obtaining the negative sequence component of the rotor current in the step (3), and setting the d-axis given value in the positive rotation synchronous rotation dq + coordinate system
Superposing to obtain the total d-axis component given value of the rotor current under the forward rotation synchronous rotation dq + coordinate system
Setting a q-axis given value of the rotor current positive sequence component obtained in the step (1) in a positive rotation synchronous rotation dq + coordinate system
And (4) obtaining the negative sequence component of the rotor current in the step (3), and setting the q-axis given value in a forward synchronous rotation dq + coordinate system
Superposing to obtain the total set value of the q-axis component of the rotor current under the forward rotation synchronous rotation dq + coordinate system
(5) The total d-axis component given value of the rotor current in a forward rotation synchronous dq + coordinate system
D-axis component in dq + coordinate system rotating synchronously with rotor current in forward rotation
Making a difference, and obtaining a d-axis component given value of the rotor control voltage in a forward synchronous rotation dq + coordinate system through a proportional-integral controller and a resonant controller PIR
The q-axis component of the rotor current under a forward rotation synchronous dq + coordinate systemTotal set point value
Q-axis component in dq + coordinate system rotating synchronously with rotor current in forward rotation
Making a difference, and obtaining a q-axis component given value of the rotor control voltage in a forward synchronous rotation dq + coordinate system through a proportional-integral controller and a resonant controller PIR
The rotor current can be directly obtained through a double-fed motor, and then the d-axis component and the q-axis component of the rotor current in a forward rotation synchronous rotation dq + coordinate system are calculated;
(6) setting the component given values of the d axis and the q axis of the rotor control voltage in a forward rotation synchronous rotation dq + coordinate system
And
obtaining the given values of the alpha axis and beta axis components of the rotor control voltage in a two-phase static coordinate system through coordinate conversion
And
the coordinates are transformed as follows:
wherein the content of the first and second substances,
on the Matlab simulation platform, the pairThe theory carries out verification function, and the leakage inductance L of the stator of the double-fed unit in the simulation modells144uH, rotor leakage inductance Llr109uH, the opening voltage 1955V, because the rotor voltage is pulse, the rotor voltage in the simulation result graph is processed by 340Hz filtering. Fig. 2 shows a graph of a simulation result of the machine-side converter blocking pulse under the 20% asymmetric drop working condition, wherein 4 groups of curves in the left graph are respectively stator voltage/V, stator current/a, rotor current/a and rotor voltage/V (switch components are filtered), and 4 curves in the right graph are respectively active power/pu, reactive current/pu and direct current voltage/V. Fig. 3 shows a simulation result after the negative-sequence current control of the rotor is added according to the first scheme under the 20% asymmetric drop working condition. The method has the advantages that the rotor negative sequence current control is added to enable the machine-side converter to enter a controlled region, so that the double-fed motor has certain positive sequence current control capability, the situation that the rotor voltage of the double-fed motor injects energy into a direct-current side in an uncontrolled rectification mode is avoided, and the switching times of the direct-current side energy discharge resistor are greatly reduced.
Fig. 4 shows a 20% low-pass test waveform after a double-fed wind farm is put into negative-sequence current control, wherein fig. 4(a) is stator voltage/V, fig. 4(b) is stator current/a, fig. 4(c) is rotor current/V, and the abscissa is time/s. Therefore, the machine side converter enters a controlled range, and the control effect is good.
The invention also provides a control device of the double-fed motor under the condition of asymmetrical depth of the power grid, which comprises the following components: the system comprises a parameter acquisition module, a rotor current positive sequence component given value calculation module, a stator voltage negative sequence component acquisition module, a rotor current negative sequence component given value calculation module, a rotor current negative sequence component given value conversion module, a rotor current total given value calculation module, a rotor control voltage given value calculation module and a rotor control voltage coordinate conversion module;
the parameter acquisition module is used for acquiring an active set value, a reactive set value, an active and a reactive of a stator of the doubly-fed motor;
the rotor current positive sequence component given value calculating module is used for calculating a d-axis component given value of the rotor current positive sequence component in a positive rotation synchronous rotation dq + coordinate system according to the stator active given value and the stator active; and the controller is used for calculating a q-axis component given value of a rotor current positive sequence component in a forward rotation synchronous rotation dq + coordinate system according to the stator reactive given value and the stator reactive;
the stator voltage negative sequence component acquisition module is used for acquiring the power grid voltage and separating positive and negative sequence components of the power grid voltage to obtain a d-axis component and a q-axis component of the stator voltage negative sequence component in a reverse synchronous rotation dq-coordinate system and a positive sequence component angle and a negative sequence component angle of the power grid voltage;
the rotor current negative sequence component given value calculating module is used for calculating a d-axis component given value and a q-axis component given value of a rotor current negative sequence component in a reverse synchronous rotation dq-coordinate system according to a d-axis component and a q-axis component of the stator voltage negative sequence component in the reverse synchronous rotation dq-coordinate system;
the rotor current negative sequence component given value conversion module is used for calculating a d-axis component given value and a q-axis component given value of a rotor current negative sequence component in a forward rotation synchronous rotation dq + coordinate system according to the d-axis component given value and the q-axis component given value of the rotor current negative sequence component in a reverse rotation synchronous rotation dq-coordinate system and a positive sequence component angle and a negative sequence component angle of a grid voltage;
the rotor current total given value calculation module is used for calculating a d-axis component total given value and a q-axis component total given value of the rotor current in a forward synchronous rotation dq + coordinate system according to the d-axis component given value and the q-axis component given value of the rotor current positive sequence component in the forward synchronous rotation dq + coordinate system and the d-axis component given value and the q-axis component given value of the rotor current negative sequence component in the forward synchronous rotation dq + coordinate system;
the rotor control voltage given value calculation module is used for calculating a d-axis component given value and a q-axis component given value of a rotor control voltage in a forward synchronous rotation dq + coordinate system according to the d-axis component total given value and the q-axis component total given value of the rotor current in the forward synchronous rotation dq + coordinate system and the d-axis component and the q-axis component of the rotor current in the forward synchronous rotation dq + coordinate system;
the rotor control voltage coordinate conversion module is used for calculating an alpha axis component given value and a beta axis component given value of the rotor control voltage in a two-phase static coordinate system according to a d axis component given value and a q axis component given value of the rotor control voltage in a forward rotation synchronous rotation dq + coordinate system and a power grid voltage positive sequence component angle.
The rotor current positive sequence component given value calculation module calculates a d-axis component given value and a q-axis component given value of a rotor current positive sequence component in a forward synchronous rotation dq + coordinate system, and comprises the following steps:
calculating the deviation between the stator active given value and the stator active given value, and sending the deviation to a proportional integral controller PI to obtain a d-axis component given value of a rotor current positive sequence component in a forward rotation synchronous rotation dq + coordinate system; and calculating the deviation between the stator reactive given value and the stator reactive given value, and sending the deviation into a proportional integral controller PI to obtain a q-axis component given value of the rotor current positive sequence component in a forward rotation synchronous rotation dq + coordinate system.
And the stator voltage negative sequence component acquisition module adopts a double-sequence phase-locked loop DSRPLL to separate the positive and negative sequence components of the power grid voltage.
The rotor current negative sequence component given value calculation module calculates a d-axis component given value and a q-axis component given value of a rotor current negative sequence component in a reverse synchronous rotation dq-coordinate system, and comprises the following steps:
wherein the content of the first and second substances,
and
a d-axis component given value and a q-axis component given value of a rotor current negative sequence component in a reverse synchronous rotation dq-coordinate system are set,
and
for the d-axis and q-axis components, ω, of the negative sequence component of the stator voltage in the inverted synchronous rotation dq-coordinate system0Electrical frequency, L, corresponding to the angular frequency of the positive sequence of the stator currentlsAnd LlrThe leakage inductance of the stator and the leakage inductance of the rotor of the doubly-fed motor are obtained.
The rotor current negative sequence component given value conversion module calculates a d-axis component given value and a q-axis component given value of a rotor current negative sequence component in a forward synchronous rotation dq + coordinate system, and comprises the following steps:
wherein the content of the first and second substances,
and
for d component given value and q axis component given value of rotor current negative sequence component in positive rotation synchronous rotation dq + coordinate systemu+And thetau-The positive sequence component angle and the negative sequence component angle of the grid voltage.
The rotor current total given value calculation module calculates a d-axis component total given value and a q-axis component total given value of rotor current in a forward rotation synchronous rotation dq + coordinate system, and comprises the following steps:
superposing a d-axis component given value of the rotor current positive sequence component in a forward synchronous rotation dq + coordinate system and a d-axis component given value of the rotor current negative sequence component in the forward synchronous rotation dq + coordinate system to obtain a d-axis component total given value of the rotor current in the forward synchronous rotation dq + coordinate system; and superposing the q-axis component given value of the rotor current positive sequence component in the forward synchronous rotation dq + coordinate system and the q-axis component given value of the rotor current negative sequence component in the forward synchronous rotation dq + coordinate system to obtain the q-axis component total given value of the rotor current in the forward synchronous rotation dq + coordinate system.
The rotor control voltage given value calculation module calculates a d-axis component given value and a q-axis component total given value of the rotor control voltage in a forward rotation synchronous rotation dq + coordinate system, and comprises the following steps:
the total d-axis component given value of the rotor current in the forward synchronous rotation dq + coordinate system is subtracted from the d-axis component of the rotor current in the forward synchronous rotation dq + coordinate system, and the difference is sent to a proportional-integral controller and a resonant controller PIR to obtain the d-axis component given value of the rotor control voltage in the forward synchronous rotation dq + coordinate system; and (3) making a difference between the total given value of the q-axis component of the rotor current in the forward synchronous rotation dq + coordinate system and the q-axis component of the rotor current in the forward synchronous rotation dq + coordinate system, and sending the difference to a proportional-integral controller and a resonant controller PIR to obtain the given value of the q-axis component of the rotor control voltage in the forward synchronous rotation dq + coordinate system.
The rotor control voltage coordinate conversion module calculates an alpha axis component given value and a beta axis component given value of a rotor control voltage in a two-phase static coordinate system, and comprises the following steps:
wherein the content of the first and second substances,
and
for a d-axis component given value and a q-axis component given value of a rotor control voltage in a forward synchronous rotation dq + coordinate system,
and
for the rotor control voltage in the two-phase stationary coordinate system alpha axis component given value and beta axis component given value, thetau+Is the angle of the positive sequence component of the network voltage.
It is to be noted that the apparatus embodiment corresponds to the method embodiment, and the implementation manners of the method embodiment are all applicable to the apparatus embodiment and can achieve the same or similar technical effects, so that the details are not described herein.
As will be appreciated by one skilled in the art, embodiments of the present application may be provided as a method, system, or computer program product. Accordingly, the present application may take the form of an entirely hardware embodiment, an entirely software embodiment or an embodiment combining software and hardware aspects. Furthermore, the present application may take the form of a computer program product embodied on one or more computer-usable storage media (including, but not limited to, disk storage, CD-ROM, optical storage, and the like) having computer-usable program code embodied therein.
The present application is described with reference to flowchart illustrations and/or block diagrams of methods, apparatus (systems), and computer program products according to embodiments of the application. It will be understood that each flow and/or block of the flow diagrams and/or block diagrams, and combinations of flows and/or blocks in the flow diagrams and/or block diagrams, can be implemented by computer program instructions. These computer program instructions may be provided to a processor of a general purpose computer, special purpose computer, embedded processor, or other programmable data processing apparatus to produce a machine, such that the instructions, which execute via the processor of the computer or other programmable data processing apparatus, create means for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.
These computer program instructions may also be stored in a computer-readable memory that can direct a computer or other programmable data processing apparatus to function in a particular manner, such that the instructions stored in the computer-readable memory produce an article of manufacture including instruction means which implement the function specified in the flowchart flow or flows and/or block diagram block or blocks.
These computer program instructions may also be loaded onto a computer or other programmable data processing apparatus to cause a series of operational steps to be performed on the computer or other programmable apparatus to produce a computer implemented process such that the instructions which execute on the computer or other programmable apparatus provide steps for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.
Finally, it should be noted that: the above embodiments are only for illustrating the technical solutions of the present invention and not for limiting the same, and although the present invention is described in detail with reference to the above embodiments, those of ordinary skill in the art should understand that: modifications and equivalents may be made to the embodiments of the invention without departing from the spirit and scope of the invention, which is to be covered by the claims.
Claims (7)
1. A control method of a doubly-fed motor under the asymmetric working condition of a power grid is characterized by comprising the following steps:
(1) obtaining a stator active given value, a stator reactive given value, a stator active and a stator reactive of the doubly-fed motor;
(2) calculating a d-axis component given value of a rotor current positive sequence component in a forward synchronous rotation dq + coordinate system according to the stator active given value and the stator active; calculating a q-axis component given value of a rotor current positive sequence component in a forward rotation synchronous rotation dq + coordinate system according to the stator reactive given value and the stator reactive given value;
(3) acquiring power grid voltage, and separating positive and negative sequence components of the power grid voltage to obtain a d-axis component and a q-axis component of a negative sequence component of the stator voltage in a reverse synchronous rotation dq-coordinate system, and a positive sequence component angle and a negative sequence component angle of the power grid voltage;
(4) calculating a d-axis component given value and a q-axis component given value of the negative sequence component of the rotor current in a reverse synchronous rotation dq-coordinate system according to the d-axis component and the q-axis component of the negative sequence component of the stator voltage in the reverse synchronous rotation dq-coordinate system;
the method comprises the following steps:
wherein the content of the first and second substances,
and
a d-axis component given value and a q-axis component given value of a rotor current negative sequence component in a reverse synchronous rotation dq-coordinate system are set,
and
for the d-axis and q-axis components, ω, of the negative sequence component of the stator voltage in the inverted synchronous rotation dq-coordinate system0Electrical frequency, L, corresponding to the angular frequency of the positive sequence of the stator currentlsAnd LlrThe leakage inductance of the stator and the leakage inductance of the rotor of the double-fed motor are obtained;
(5) calculating a d-axis component given value and a q-axis component given value of the rotor current negative sequence component in a forward rotation synchronous rotation dq + coordinate system according to the d-axis component given value and the q-axis component given value of the rotor current negative sequence component in a reverse rotation synchronous rotation dq-coordinate system and a positive sequence component angle and a negative sequence component angle of the grid voltage; the method comprises the following steps:
wherein the content of the first and second substances,
and
for d component given value and q axis component given value of rotor current negative sequence component in positive rotation synchronous rotation dq + coordinate systemu+And thetau-The positive sequence component angle and the negative sequence component angle of the power grid voltage are obtained;
(6) calculating a total d-axis component given value and a total q-axis component given value of the rotor current in a forward synchronous rotation dq + coordinate system according to the d-axis component given value and the q-axis component given value of the rotor current positive sequence component in the forward synchronous rotation dq + coordinate system and the d-axis component given value and the q-axis component given value of the rotor current negative sequence component in the forward synchronous rotation dq + coordinate system;
(7) calculating a d-axis component given value and a q-axis component given value of a rotor control voltage in a forward synchronous rotation dq + coordinate system according to the d-axis component total given value and the q-axis component total given value of the rotor current in the forward synchronous rotation dq + coordinate system and the d-axis component and the q-axis component of the rotor current in the forward synchronous rotation dq + coordinate system;
(8) and calculating the alpha-axis component given value and the beta-axis component given value of the rotor control voltage in a two-phase stationary coordinate system according to the d-axis component given value and the q-axis component given value of the rotor control voltage in a forward synchronous rotation dq + coordinate system and the positive sequence component angle of the power grid voltage.
2. The method for controlling the doubly-fed machine under the asymmetric working condition of the power grid according to claim 1, wherein the step of calculating a d-axis component given value and a q-axis component given value of a rotor current positive sequence component in a forward rotation synchronous rotation dq + coordinate system comprises the following steps:
calculating the deviation between the stator active given value and the stator active given value, and sending the deviation to a proportional integral controller PI to obtain a d-axis component given value of a rotor current positive sequence component in a forward rotation synchronous rotation dq + coordinate system; and calculating the deviation between the stator reactive given value and the stator reactive given value, and sending the deviation into a proportional integral controller PI to obtain a q-axis component given value of the rotor current positive sequence component in a forward rotation synchronous rotation dq + coordinate system.
3. The method for controlling the doubly-fed machine under the asymmetric condition of the power grid as claimed in claim 1, wherein a double-sequence phase-locked loop (DSRPLL) is used for separating positive and negative sequence components of the voltage of the power grid.
4. The method for controlling the doubly-fed machine under the asymmetric working condition of the power grid according to claim 1, wherein the step of calculating the total d-axis component given value and the total q-axis component given value of the rotor current in a forward rotation synchronous rotation dq + coordinate system comprises the following steps:
superposing a d-axis component given value of the rotor current positive sequence component in a forward synchronous rotation dq + coordinate system and a d-axis component given value of the rotor current negative sequence component in the forward synchronous rotation dq + coordinate system to obtain a d-axis component total given value of the rotor current in the forward synchronous rotation dq + coordinate system; and superposing the q-axis component given value of the rotor current positive sequence component in the forward synchronous rotation dq + coordinate system and the q-axis component given value of the rotor current negative sequence component in the forward synchronous rotation dq + coordinate system to obtain the q-axis component total given value of the rotor current in the forward synchronous rotation dq + coordinate system.
5. The method for controlling the doubly-fed machine under the asymmetric working condition of the power grid according to claim 1, wherein the step of calculating a d-axis component given value and a q-axis component given value of the rotor control voltage in a forward synchronous rotation dq + coordinate system comprises the following steps:
the total d-axis component given value of the rotor current in the forward synchronous rotation dq + coordinate system is subtracted from the d-axis component of the rotor current in the forward synchronous rotation dq + coordinate system, and the difference is sent to a proportional-integral controller and a resonant controller PIR to obtain the d-axis component given value of the rotor control voltage in the forward synchronous rotation dq + coordinate system; and (3) making a difference between the total given value of the q-axis component of the rotor current in the forward synchronous rotation dq + coordinate system and the q-axis component of the rotor current in the forward synchronous rotation dq + coordinate system, and sending the difference to a proportional-integral controller and a resonant controller PIR to obtain the given value of the q-axis component of the rotor control voltage in the forward synchronous rotation dq + coordinate system.
6. The method for controlling the doubly-fed machine under the asymmetric working condition of the power grid according to claim 1, wherein the step of calculating the given value of the alpha-axis component and the given value of the beta-axis component of the rotor control voltage in the two-phase static coordinate system comprises the following steps:
wherein the content of the first and second substances,
and
for a d-axis component given value and a q-axis component given value of a rotor control voltage in a forward synchronous rotation dq + coordinate system,
and
for the rotor control voltage in the two-phase stationary coordinate system alpha axis component given value and beta axis component given value, thetau+Is the angle of the positive sequence component of the network voltage.
7. The utility model provides a controlling means of doubly-fed motor under the asymmetric operating mode of electric wire netting which characterized in that includes: the system comprises a parameter acquisition module, a rotor current positive sequence component given value calculation module, a stator voltage negative sequence component acquisition module, a rotor current negative sequence component given value calculation module, a rotor current negative sequence component given value conversion module, a rotor current total given value calculation module, a rotor control voltage given value calculation module and a rotor control voltage coordinate conversion module;
the parameter acquisition module is used for acquiring an active set value, a reactive set value, an active and a reactive of a stator of the doubly-fed motor;
the rotor current positive sequence component given value calculating module is used for calculating a d-axis component given value of the rotor current positive sequence component in a positive rotation synchronous rotation dq + coordinate system according to the stator active given value and the stator active; and the controller is used for calculating a q-axis component given value of a rotor current positive sequence component in a forward rotation synchronous rotation dq + coordinate system according to the stator reactive given value and the stator reactive;
the stator voltage negative sequence component acquisition module is used for acquiring the power grid voltage and separating positive and negative sequence components of the power grid voltage to obtain a d-axis component and a q-axis component of the stator voltage negative sequence component in a reverse synchronous rotation dq-coordinate system and a positive sequence component angle and a negative sequence component angle of the power grid voltage;
the rotor current negative sequence component given value calculating module is used for calculating a d-axis component given value and a q-axis component given value of a rotor current negative sequence component in a reverse synchronous rotation dq-coordinate system according to a d-axis component and a q-axis component of the stator voltage negative sequence component in the reverse synchronous rotation dq-coordinate system; the calculation formula is as follows:
wherein the content of the first and second substances,
and
a d-axis component given value and a q-axis component given value of a rotor current negative sequence component in a reverse synchronous rotation dq-coordinate system are set,
and
for the d-axis and q-axis components, ω, of the negative sequence component of the stator voltage in the inverted synchronous rotation dq-coordinate system0Electrical frequency, L, corresponding to the angular frequency of the positive sequence of the stator currentlsAnd LlrThe leakage inductance of the stator and the leakage inductance of the rotor of the double-fed motor are obtained;
the rotor current negative sequence component given value conversion module is used for calculating a d-axis component given value and a q-axis component given value of a rotor current negative sequence component in a forward rotation synchronous rotation dq + coordinate system according to the d-axis component given value and the q-axis component given value of the rotor current negative sequence component in a reverse rotation synchronous rotation dq-coordinate system and a positive sequence component angle and a negative sequence component angle of a grid voltage; the calculation formula is as follows:
wherein the content of the first and second substances,
and
for d-component given value and q-component of negative sequence component of rotor current in forward synchronous rotation dq + coordinate systemGiven value of axial component, thetau+And thetau-The positive sequence component angle and the negative sequence component angle of the power grid voltage are obtained;
the rotor current total given value calculation module is used for calculating a d-axis component total given value and a q-axis component total given value of the rotor current in a forward synchronous rotation dq + coordinate system according to the d-axis component given value and the q-axis component given value of the rotor current positive sequence component in the forward synchronous rotation dq + coordinate system and the d-axis component given value and the q-axis component given value of the rotor current negative sequence component in the forward synchronous rotation dq + coordinate system;
the rotor control voltage given value calculation module is used for calculating a d-axis component given value and a q-axis component given value of a rotor control voltage in a forward synchronous rotation dq + coordinate system according to the d-axis component total given value and the q-axis component total given value of the rotor current in the forward synchronous rotation dq + coordinate system and the d-axis component and the q-axis component of the rotor current in the forward synchronous rotation dq + coordinate system;
the rotor control voltage coordinate conversion module is used for calculating an alpha axis component given value and a beta axis component given value of the rotor control voltage in a two-phase static coordinate system according to a d axis component given value and a q axis component given value of the rotor control voltage in a forward rotation synchronous rotation dq + coordinate system and a power grid voltage positive sequence component angle.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910514058.0A CN110336503B (en) | 2019-06-14 | 2019-06-14 | Control method and device of double-fed motor under power grid depth asymmetric working condition |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910514058.0A CN110336503B (en) | 2019-06-14 | 2019-06-14 | Control method and device of double-fed motor under power grid depth asymmetric working condition |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN110336503A CN110336503A (en) | 2019-10-15 |
| CN110336503B true CN110336503B (en) | 2021-04-02 |
Family
ID=68142169
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201910514058.0A Active CN110336503B (en) | 2019-06-14 | 2019-06-14 | Control method and device of double-fed motor under power grid depth asymmetric working condition |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN110336503B (en) |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112542973B (en) * | 2020-12-03 | 2023-03-31 | 湖南航天磁电有限责任公司 | Control method of brushless double-fed induction motor under unbalanced power grid |
| CN113765459A (en) * | 2021-10-08 | 2021-12-07 | 国网黑龙江省电力有限公司电力科学研究院 | Proportional-integral resonance control method for asynchronous phase modulator in unbalanced power grid |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB2420456A (en) * | 2004-11-23 | 2006-05-24 | Areva T & D Uk Ltd | Generator control having grid imbalance detector |
| CN102751934A (en) * | 2012-07-20 | 2012-10-24 | 阳光电源股份有限公司 | Device and method for cooperatively controlling unbalanced current of doubly-fed converter |
| CN103117700A (en) * | 2013-02-25 | 2013-05-22 | 浙江大学 | DFIG (doubly fed induction generator) control method based on resonant feedback in unbalanced power network |
| CN103606948A (en) * | 2013-10-10 | 2014-02-26 | 国电南瑞科技股份有限公司 | Asymmetric operation method of direct-driven wind power converter and based on PIR controller |
| CN105024607A (en) * | 2015-07-14 | 2015-11-04 | 浙江大学 | Matrix converter excitation-based DFIG control method under unbalanced network voltage |
-
2019
- 2019-06-14 CN CN201910514058.0A patent/CN110336503B/en active Active
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB2420456A (en) * | 2004-11-23 | 2006-05-24 | Areva T & D Uk Ltd | Generator control having grid imbalance detector |
| CN102751934A (en) * | 2012-07-20 | 2012-10-24 | 阳光电源股份有限公司 | Device and method for cooperatively controlling unbalanced current of doubly-fed converter |
| CN103117700A (en) * | 2013-02-25 | 2013-05-22 | 浙江大学 | DFIG (doubly fed induction generator) control method based on resonant feedback in unbalanced power network |
| CN103606948A (en) * | 2013-10-10 | 2014-02-26 | 国电南瑞科技股份有限公司 | Asymmetric operation method of direct-driven wind power converter and based on PIR controller |
| CN105024607A (en) * | 2015-07-14 | 2015-11-04 | 浙江大学 | Matrix converter excitation-based DFIG control method under unbalanced network voltage |
Also Published As
| Publication number | Publication date |
|---|---|
| CN110336503A (en) | 2019-10-15 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN105958552B (en) | Adapt to unbalanced power grid and the virtual synchronous generator control method of loading condition | |
| CN108879779B (en) | Double-fed fan comprehensive low-voltage ride through method based on stator series dynamic reactance | |
| CN102710206B (en) | Variable-speed permanent-magnet alternator system and double-port voltage stabilization control method therefor | |
| CN110336503B (en) | Control method and device of double-fed motor under power grid depth asymmetric working condition | |
| CN105048510B (en) | Direct-driven permanent-magnetic wind power generation system active power dynamic control method under voltage drop condition | |
| CN110460106B (en) | DFIG virtual synchronization control method and system under unbalanced power grid | |
| CN114977270A (en) | Self-synchronizing voltage source full-power conversion wind turbine generator control system | |
| CN106230031A (en) | Containing permanent magnet direct-drive wind energy turbine set and the control method mixing wind farm group of asynchronous wind energy turbine set under unbalanced source voltage | |
| CN104993743A (en) | Stalling time-delay method used for new energy automobile permanent magnet synchronous drive motor | |
| Mao et al. | Sensorless starting control of brushless synchronous starter/generators for the full-speed range | |
| CN110198050B (en) | DFIG virtual synchronous control method based on torque-reactive power cooperative control under unbalanced power grid | |
| CN101499665A (en) | Idle grid connection control method for speed variant frequency constant dual feedback asynchronous wind power generator set | |
| CN113595092B (en) | Composite fault ride-through control method, device, equipment and storage medium | |
| CN109039180B (en) | Fractional order control method for grid connection process of doubly-fed induction generator | |
| Xiao-Ming et al. | Direct power control for wind-turbine driven doubly-fed induction generator with constant switch frequency | |
| CN104993756B (en) | The failure operation method of double-fed wind power generator rotor magnetic linkage weak magnetic control | |
| CN105186953B (en) | Double-fed induction wind driven generator transient current tracking and controlling method under electric network fault | |
| CN104218605A (en) | Non-impact-current grid connection method for three-phase voltage source grid-connected inverters | |
| Lee et al. | Control method of a doubly-fed induction generator with automatic grid synchronization | |
| Hu et al. | A vector control strategy of grid-connected brushless doubly fed induction generator based on the vector control of doubly fed induction generator | |
| CN112232009B (en) | Method and device for calculating short-circuit current in whole process of low-voltage crossing of doubly-fed fan | |
| Kou et al. | An envelope-prediction-based sensorless rotor position observation scheme for LCI-fed EESM at zero and low speed | |
| Gao et al. | Improved control scheme for unbalanced standalone BDFIG using dead beat control method | |
| CN107888122A (en) | A kind of vector control system and its strategy process for high voltage converter | |
| CN110289629B (en) | DFIG virtual synchronization control method based on expanded power under unbalanced power grid |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant |