CN114499225A - Voltage source and current source dual-mode switching control method for converter - Google Patents
Voltage source and current source dual-mode switching control method for converter Download PDFInfo
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- CN114499225A CN114499225A CN202210355534.0A CN202210355534A CN114499225A CN 114499225 A CN114499225 A CN 114499225A CN 202210355534 A CN202210355534 A CN 202210355534A CN 114499225 A CN114499225 A CN 114499225A
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M5/00—Conversion of ac power input into ac power output, e.g. for change of voltage, for change of frequency, for change of number of phases
- H02M5/40—Conversion of ac power input into ac power output, e.g. for change of voltage, for change of frequency, for change of number of phases with intermediate conversion into dc
- H02M5/42—Conversion of ac power input into ac power output, e.g. for change of voltage, for change of frequency, for change of number of phases with intermediate conversion into dc by static converters
- H02M5/44—Conversion of ac power input into ac power output, e.g. for change of voltage, for change of frequency, for change of number of phases with intermediate conversion into dc by static converters using discharge tubes or semiconductor devices to convert the intermediate dc into ac
- H02M5/453—Conversion of ac power input into ac power output, e.g. for change of voltage, for change of frequency, for change of number of phases with intermediate conversion into dc by static converters using discharge tubes or semiconductor devices to convert the intermediate dc into ac using devices of a triode or transistor type requiring continuous application of a control signal
- H02M5/458—Conversion of ac power input into ac power output, e.g. for change of voltage, for change of frequency, for change of number of phases with intermediate conversion into dc by static converters using discharge tubes or semiconductor devices to convert the intermediate dc into ac using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only
- H02M5/4585—Conversion of ac power input into ac power output, e.g. for change of voltage, for change of frequency, for change of number of phases with intermediate conversion into dc by static converters using discharge tubes or semiconductor devices to convert the intermediate dc into ac using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only having a rectifier with controlled elements
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- 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
- H02J3/38—Arrangements for parallely feeding a single network by two or more generators, converters or transformers
- H02J3/381—Dispersed generators
-
- 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
- H02J2300/00—Systems for supplying or distributing electric power characterised by decentralized, dispersed, or local generation
- H02J2300/20—The dispersed energy generation being of renewable origin
- H02J2300/22—The renewable source being solar energy
- H02J2300/24—The renewable source being solar energy of photovoltaic origin
-
- 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
- Y02E10/00—Energy generation through renewable energy sources
- Y02E10/70—Wind energy
- Y02E10/76—Power conversion electric or electronic aspects
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- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Control Of Eletrric Generators (AREA)
Abstract
The invention discloses a voltage source and current source dual-mode switching control method for a converter, which comprises the following steps: 1) constructing virtual synch Ring output Angle
Calculation module, virtual synchronous ring reference voltage amplitude E calculation module and current reference value output by network side alternating voltage control ring
D-axis component of current reference value output by calculation module and machine side alternating voltage control loop
And q-axis component
A calculation module; 2) output angle using virtual synchronizer ring
Calculation module, virtual synchronous ring reference voltage amplitude E calculation module and current reference value output by network side alternating voltage control ring
D-axis component of current reference value output by calculation module and machine side alternating voltage control loop
And q-axis component
The computing module switches a current source control mode and a voltage source control mode of the permanent magnet wind turbine generator, and the method can realize switching of the operation modes of the permanent magnet wind turbine generator in the microgrid.
Description
Technical Field
The invention belongs to the technical field of automatic control, and relates to a voltage source and current source dual-mode switching control method for a converter.
Background
The permanent magnet wind turbine generator is the current mainstream wind turbine generator, and the requirements on the operation function of the permanent magnet wind turbine generator are increasingly improved along with the increase of the specific gravity of wind power in a micro-grid. Under a common condition, a control mode of a permanent magnet wind turbine generator runs in a current source control mode, the generator follows the voltage of a grid-connected point, and the current source mode lacks an active supporting effect on a micro-grid system, so that wind power cannot be independently used as a main power source in the micro-grid. The voltage source control mode is the development trend of future wind turbines, and the voltage source mode can provide active support for the micro-grid, so that the voltage source type wind turbine can be used as a main power source in the micro-grid. When the micro-grid operates in a grid-connected mode, the permanent magnet wind turbine generator works in a current source mode; when the microgrid is operated in an off-grid mode, the microgrid can be operated in a voltage source mode or a current source mode according to system instructions.
Taking the example of switching the current source control to the voltage source control, the amplitude value output by the adaptive integral controller in the current source mode is assigned to the adaptive integral controller in the voltage source mode as an initial value to realize the switching.
In the prior art, the output of the adaptive integral controller in the current source control mode is used as an initial value to be assigned to the adaptive integral controller in the voltage source mode during switching, but the input of the integral controller is equivalent to hard switching, and power fluctuation can be reflected on the power output of the wind turbine generator.
In addition, only one patent is relevant to the problem, which is applied to judging whether the power grid is stable or not, and a double-fed wind turbine is adopted as a fan, but a specific control mode switching mode is not provided.
Disclosure of Invention
The invention aims to overcome the defects of the prior art and provides a voltage source and current source dual-mode switching control method for a converter, which can realize the switching of the running modes of a permanent magnet wind motor in a micro-grid.
In order to achieve the above object, the dual-mode switching control method of the voltage source and the current source for the converter of the present invention comprises:
1) constructing virtual synch Ring output Angle
Calculation module, virtual synchronous ring reference voltage amplitude E calculation module and current reference value output by network side alternating voltage control ring
D-axis component of current reference value output by calculation module and machine side alternating voltage control loop
And q-axis component
A calculation module;
2) output angle using virtual synchronizer ring
Calculation module, virtual synchronous ring reference voltage amplitude E calculation module and current reference value output by network side alternating voltage control ring
D-axis component of current reference value output by calculation module and machine side alternating voltage control loop
And q-axis component
And the computing module switches a current source control mode and a voltage source control mode of the permanent magnet wind turbine generator.
Virtual synchronizer ring output angle
The calculation module comprises the stator voltage of the generator
、
And
the device comprises an input end, a coordinate transformation module (1), a first PI controller (2), a first integration module (3), a second integration module (4), a third integration module (5), a first subtracter, a second subtracter, a third subtracter, a first adder, a second adder, a first switch (K0), a second switch (K1), a third switch (K2), a permanent magnet wind turbine generator output active power input end, a permanent magnet wind turbine generator output power reference value input end, a virtual rotational inertia input end, a first divider, a frequency reference value input end, an active-frequency droop coefficient calculation module (17), a virtual synchronous ring output angle output end and a first inertia coefficient input end;
stator voltage of generator
、
And
the input end of the coordinate transformation module (1) is connected with the input end of the coordinate transformation module (1), the q-axis component output end of the coordinate transformation module (1) is connected with the input end of the first PI controller (2), the output end of the first PI controller (2) is connected with the input end of the first integration module (3), and the output end of the first integration module (3) is connected with the input end of the coordinate transformation module (1) and the first free end of the third switch (K2);
the output active power input end of the permanent magnet wind turbine generator set is connected with the output power reference value input end of the permanent magnet wind turbine generator set and the input end of a first subtracter, the output end of the first subtracter is connected with the input end of a first adder, the output end of the first adder and the virtual rotational inertia input end of the first adder are connected with the input end of a first divider, the output end of the first divider is connected with the first free end of a first switch (K0), the second free end of the first switch (K0) is suspended, the fixed end of the first switch (K0) is connected with the input end of a second adder through a second integration module (4), the output end of the second adder is connected with the input end of a second subtracter and the input end of a third integration module (5), the output end of the third integration module (5) is connected with the second free end of a third switch (K2), and the frequency reference value input end of the second subtracter is connected with the input end of the second subtracter, the output end of the second subtracter is connected with the input end of an active-frequency droop coefficient calculation module (17), the output end of the active-frequency droop coefficient calculation module (17) is connected with the input end of the first adder, the output end of the third integration module (5) and the output end of the virtual synchronization ring output angle are connected with the input end of the third subtracter, the output end of the third subtracter and the input end of the first inertia coefficient are connected with the input end of the first multiplier, the output end of the first multiplier is connected with the first free end of the second switch (K1), the second free end of the second switch (K1) is suspended, the fixed end of the second switch (K1) is connected with the input end of the second adder, and the fixed end of the second switch (K1) is connected with the output end of the virtual synchronization ring output angle.
The virtual synchronous ring reference voltage amplitude E calculation module comprises a third adder, a fourth subtractor, a fifth subtractor, a sixth subtractor, a first numerical value slow starter (6), a reactive-voltage droop coefficient calculation module (7), a permanent magnet wind turbine generator output reactive power reference value input end, a permanent magnet wind turbine generator output reactive power input end, a second inertia coefficient input end, a second multiplier, a fourth switch (K3), a fourth integration module (8), a virtual synchronous ring reference voltage amplitude output end, a virtual synchronous ring output voltage amplitude input end, a virtual synchronous ring output voltage base value input end and a third inertia coefficient input end;
the input end of the reference value of the reactive power output by the permanent magnet wind turbine generator set is connected with the input end of a third adder, the output end of the third adder and the input end of the reactive power output by the permanent magnet wind turbine generator set are connected with the input end of a fourth subtracter, the output end of the fourth subtracter and the input end of a second inertia coefficient are connected with the input end of a second multiplier, the output end of the second multiplier is connected with the input end of a first numerical value slow starter (6), the output end of the first numerical value slow starter (6) is connected with the first free end of a fourth switch (K3), the fixed end of the fourth switch (K3) is connected with the input end of a fourth integration module (8), the output end of the fourth integration module (8) is connected with the output end of the reference voltage amplitude of a virtual synchronous ring and the input end of a fifth subtracter, the input end of the output voltage amplitude of the virtual synchronous ring is connected with the input end of the fifth subtracter and the input end of the sixth subtracter, the output voltage basic value input end of the virtual synchronous ring is connected with the input end of a sixth subtracter, the output end of the sixth subtracter is connected with the input end of a reactive-voltage droop coefficient calculation module (7), the output end of the reactive-voltage droop coefficient calculation module (7) is connected with the input end of a third adder, the output end of a fifth subtracter and the input end of a third inertia coefficient are connected with the input end of a third multiplier, and the output end of the third multiplier is connected with the input end of a first numerical value slow starter (6) and the second free end of a fourth switch (K3).
Current reference value output by network side AC voltage control loop
The calculation module comprises a virtual synchronous ring output reference voltage amplitude output end, a converter output voltage d-axis component input end, a seventh subtracter, a second numerical value slow starter (9), a fifth switch (K4), a second PI controller (10), a converter output voltage q-axis component input end, a virtual synchronous ring output angular frequency input end, a filter capacitor input end, a fourth multiplier, an eighth subtracter, a ninth subtracter, a tenth subtracter, an eleventh subtracter, a sixth switch (K5), a third numerical value slow starter (11), a third PI controller (12), a seventh switch (K6) and a current reference value output end output by a network side alternating current voltage control ring;
the output end of the virtual synchronous ring output reference voltage amplitude and the input end of the d-axis component of the converter output voltage are connected with the input end of a seventh subtracter, the output end of the seventh subtracter is connected with the input end of a second numerical value slow starter (9), the output end of the second numerical value slow starter (9) is connected with a first free end of a fifth switch (K4), and the fixed end of the fifth switch (K4) is connected with the input end of a second PI controller (10);
the converter output voltage q-axis component input end, the virtual synchronous ring output angular frequency input end and the filter capacitor input end are connected with the input end of a fourth multiplier, the output end of the fourth multiplier and the output end of a second PI controller (10) are connected with the input end of an eighth subtracter, the output end of the eighth subtracter is connected with the input end of a ninth subtracter and a first free end of a seventh switch (K6), the grid-side alternating voltage control ring output current reference value output end is connected with the input end of the ninth subtracter, the output end of the ninth subtracter is connected with the input end of a second numerical value slow starter (9) and a second free end of a fifth switch (K4), and the fixed end of the seventh switch (K6) is connected with the current reference value output end of the grid-side alternating voltage control ring;
the direct current voltage input end and the direct current voltage reference value input end are connected with the input end of a tenth subtracter, the output end of the tenth subtracter is connected with the input end of a third numerical value slow starter (11), the output end of the third numerical value slow starter (11) is connected with the first free end of a sixth switch (K5), the current reference value output end output by an alternating current voltage control loop and the second free end of a seventh switch (K6) are connected with the input end of an eleventh subtracter, the output end of the eleventh subtracter is connected with the second free end of the sixth switch (K5) and the input end of a third PI controller (12), the fixed end of the sixth switch (K5) is connected with the input end of a third PI controller (12), the output end of the third numerical value slow starter (11) is connected with the second free end of a seventh switch (K6), and the output end of the third PI controller (12) is connected with the second free end of a seventh switch (K6).
Q-axis component of output current reference value of machine-side AC voltage control loop
The calculation module comprises a q-axis component input end of converter output voltage, a twelfth subtracter, a fourth numerical value slow starter (13), an eighth switch (K7), a fourth PI controller (14), a converter output voltage d-axis component input end, a virtual synchronous ring output angular frequency input end, a filter capacitor input end, a fifth multiplier, a fifth adder, a twelfth subtracter, a thirteenth subtracter, a ninth switch (K8) and a q-axis component of a machine side alternating voltage control ring output current reference value
The output end, the input end of the output reactive power parameter value of the permanent magnet wind motor and the d-axis component of the three-phase voltage of the-2/3 public connection point
Input deviceEnd and sixth multiplier;
the q-axis component input end of the converter output voltage is connected with the input end of a twelfth subtracter, the output end of the twelfth subtracter is connected with the input end of a fourth numerical value slow starter (13), the output end of the fourth numerical value slow starter (13) is connected with the first free end of an eighth switch (K7), the fixed end of the eighth switch (K7) is connected with the input end of a fourth PI controller (14), and the converter output voltage d-axis component input end, the virtual synchronous ring output angular frequency input end and the filter capacitor input end are connected with the input end of a fifth multiplier, the output end of the fifth multiplier and the output end of a fourth PI controller (14) are connected with the input end of a fifth adder, the output end of the fifth adder is connected with the input end of a thirteenth subtracter and the first free end of a ninth switch (K8), and the fixed end of the ninth switch (K8) is connected with the q-axis component of the machine side alternating voltage control ring output current reference value.
The output ends are connected, and the machine side alternating voltage control loop outputs the q-axis component of the current reference value
The output end of the thirteenth subtractor is connected with the input end of a thirteenth subtractor, and the output end of the thirteenth subtractor is connected with the input end of a fourth numerical value slow starter (13) and the second free end of an eighth switch (K7);
input end of output reactive power parameter value of permanent magnet wind motor and d-axis component of three-phase voltage of-2/3 public connection point
The input terminal is connected to the input terminal of the sixth multiplier, and the output terminal of the sixth multiplier is connected to the second free terminal of the eighth switch (K7).
D-axis component of current reference value output by machine-side AC voltage control loop
Calculating modelThe block comprises a direct current voltage reference value input end, a direct current voltage input end, a fourteenth subtracter, a fifth numerical value slow starter (15), a tenth switch (K9), a fifth PI controller (16), an eleventh switch (K10) and a d-axis component of a current reference value output by a machine side alternating current voltage control loop
The output end, the fifteenth subtracter and the input end of the reference value of the reactive power output by the permanent magnet wind motor are connected with the d-axis component of the three-phase voltage of the-2/3 public connection point
An input terminal and a seventh multiplier;
the input end of a direct current voltage reference value is connected with the input end of a direct current voltage and the input end of a fourteenth subtracter, the output end of the fourteenth subtracter is connected with the input end of a fifth numerical value slow starter (15), the output end of the fifth numerical value slow starter (15) is connected with a first free end of a tenth switch (K9), the fixed end of the tenth switch (K9) is connected with the input end of a fifth PI controller (16), the output end of the fifth PI controller (16) is connected with a second free end of an eleventh switch (K10) and the input end of a fifteenth subtracter, and a d-axis component of a current reference value output by a machine side alternating current voltage control loop
The output end of the second subtractor is connected with the fixed end of a fifth switch (K10) and the input end of a fifteenth subtractor, and the output end of the fifteenth subtractor is connected with the input end of a fourth PI controller (14) and the second free end of a tenth switch (K9);
d-axis component of three-phase voltage of output reactive power reference value input end of permanent magnet wind motor and-2/3 public connection point
The input terminal is connected to the input terminal of the seventh multiplier, and the output terminal of the seventh multiplier is connected to the first free terminal of the eleventh switch (K10).
Closing a second free terminal in the first switch (K0), a first free terminal in the second switch (K1), a first free terminal in the third switch (K2), a second free terminal in the fourth switch (K3), a second free terminal in the fifth switch (K4), a first free terminal in the sixth switch (K5), a second free terminal in the seventh switch (K6), a second free terminal in the eighth switch (K7), a second free terminal in the ninth switch (K8), a second free terminal in the tenth switch (K9), a first free terminal in the eleventh switch (K10), outputting an angle according to the virtual synchronization ring at the time
A virtual synchronous ring reference voltage amplitude E, a current reference value output by a network side alternating voltage control ring
And d-axis component of current reference value output by machine-side AC voltage control loop
And q-axis component
And controlling the permanent magnet wind motor to enable the permanent magnet wind motor to work in a current source control mode.
Closing a first free terminal in a first switch (K0), a second free terminal in a second switch (K1), a second free terminal in a third switch (K2), a first free terminal in a fourth switch (K3), a first free terminal in a fifth switch (K4), a second free terminal in a sixth switch (K5), a first free terminal in a seventh switch (K6), a first free terminal in an eighth switch (K7), a first free terminal in a ninth switch (K8), a first free terminal in a tenth switch (K9), a second free terminal in an eleventh switch (K10), outputting an angle according to a virtual synchronization ring at the time
A virtual synchronous ring reference voltage amplitude E, a current reference value output by a network side alternating voltage control ring
And d-axis component of current reference value output by machine-side AC voltage control loop
And q-axis component
And controlling the permanent magnet wind motor to enable the permanent magnet wind motor to work in a voltage source control mode.
When the voltage source control mode needs to be switched to, angle synchronous control is firstly carried out on the magnetic wind generator set, and then the voltage source control mode is switched to.
The invention has the following beneficial effects:
the invention relates to a voltage source and current source dual-mode switching control method for a converter, which is characterized in that when the method is specifically operated, a virtual synchronous ring output angle is firstly constructed
Calculation module, virtual synchronous ring reference voltage amplitude E calculation module and current reference value output by network side alternating voltage control ring
D-axis component of current reference value output by calculation module and machine side alternating voltage control loop
And q-axis component
A calculation module for outputting angle according to the virtual synchronous ring
Calculation module, virtual synchronous ring reference voltage amplitude E calculation module and current reference value output by network side alternating voltage control ring
D-axis component of current reference value output by calculation module and machine side alternating voltage control loop
And q-axis component
The computing module switches the current source control mode and the voltage source control mode of the permanent magnet wind turbine generator set to realize the switching of the operation modes of the permanent magnet wind turbine generator set in the microgrid, and the method is simple and convenient to operate and high in practicability.
Drawings
FIG. 1 is a main circuit diagram of a permanent magnet fan grid-connected power generation;
FIG. 2 is a control block diagram of a voltage source control mode of a permanent magnet fan grid-side converter;
FIG. 3 is a control block diagram of a current source control mode of a side converter of a permanent magnet fan;
fig. 4 is a block diagram of an active frequency control loop angle synchronization control structure;
FIG. 5 is a block diagram of a reactive voltage loop switching control architecture;
fig. 6 is a d-axis control switching block diagram of an ac voltage loop of a grid-side converter;
fig. 7 is a q-axis control switching block diagram of an ac voltage loop of a grid-side converter;
fig. 8 is a block diagram of the side converter mode switching control.
Detailed Description
In order to make the technical solutions of the present invention better understood, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, not all of the embodiments, and are not intended to limit the scope of the present disclosure. Moreover, in the following description, descriptions of well-known structures and techniques are omitted so as to not unnecessarily obscure the concepts of the present disclosure. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
There is shown in the drawings a schematic block diagram of a disclosed embodiment in accordance with the invention. The figures are not drawn to scale, wherein certain details are exaggerated and possibly omitted for clarity of presentation. The shapes of various regions, layers and their relative sizes and positional relationships shown in the drawings are merely exemplary, and deviations may occur in practice due to manufacturing tolerances or technical limitations, and a person skilled in the art may additionally design regions/layers having different shapes, sizes, relative positions, according to actual needs.
Fig. 1 is a main circuit diagram of a grid-connected permanent magnet fan power generator, in fig. 1,
respectively outputting three-phase voltage, public connection point three-phase voltage and power grid three-phase voltage for the converter;
and
respectively, an inductive current and an output current;
is a direct current voltage;
and
respectively an output filter inductor and a filter capacitor;
for the line impedance can be expressed as
；
Respectively after coordinate transformation
D-axis and q-axis components of (1); three-phase voltage
Which is representative of the stator voltage of the generator,
which is representative of the current output by the current transformer,
for its component under the dq coordinate system,
which is representative of the output voltage of the converter,
its component under the dq coordinate system is. The control strategy of the permanent magnet wind turbine generator set can be realized by changing the control methods of the rotor side converter and the grid side converter.
For a wind turbine generator under a voltage source control mode, the control target of the wind turbine generator is the amplitude and the phase of output voltage, the specific implementation method is to change the control strategy of the wind turbine generator, so that the wind turbine generator is externally represented as a voltage source characteristic, the power of the wind turbine generator can be adjusted along with the waveform of a load, and the wind turbine generator has the inertia support characteristic similar to that of a traditional synchronous generator.
FIG. 2 is a control structure diagram of a voltage-current inner loop voltage type virtual synchronous machine of a grid-side converter of a permanent magnet wind turbine generator system, wherein P, Q,
And
respectively outputting active power, reactive power and reference values thereof for the permanent magnet wind turbine;
in order for the virtual synchronization loop to output an angular frequency,
is a frequency reference value; u is the amplitude of the output voltage,
is the output voltage base value;
for the active-frequency droop coefficient,
is the reactive-voltage droop coefficient; j is virtual moment of inertia, and K is an inertia coefficient;
and E is the virtual synchronous ring output angle and the reference voltage amplitude respectively; voltage and current double closed loop
D-axis and q-axis components of the converter output voltage, respectively;
are respectively electricityD-axis and q-axis components of the inductive current;
current reference values output by the alternating voltage control loop respectively;
、
dq-axis components of the voltage reference output by the controller, respectively;
is the angular frequency of the fundamental wave of the system;
respectively are the PI parameters of the ac voltage loop and the current loop.
Fig. 3 is a control block diagram of a current source control mode on the rotor side of a permanent magnet wind turbine, and in fig. 3,
、
respectively representing the reference values of the active and reactive power output by the permanent magnet wind turbine generator;
dq-axis components of the voltage reference output by the controller, respectively;
is the current loop PI coefficient.
Referring to fig. 1, the dual-mode switching control method for the voltage source and the current source of the converter according to the present invention includes:
1) constructing virtual synch Ring output Angle
Computing Module, virtualizationSynchronous ring reference voltage amplitude E calculation module and current reference value output by network side alternating voltage control ring
D-axis component of current reference value output by calculation module and machine side alternating voltage control loop
And q-axis component
A calculation module;
2) output angle using virtual synchronizer ring
Calculation module, virtual synchronous ring reference voltage amplitude E calculation module and current reference value output by network side alternating voltage control ring
D-axis component of current reference value output by calculation module and machine-side alternating-current voltage control loop
And q-axis component
And the computing module switches a current source control mode and a voltage source control mode of the permanent magnet wind turbine generator.
Referring to FIG. 4, the virtual synchronization ring output angle
The calculation module comprises the stator voltage of the generator
、
And
the system comprises an input end, a coordinate transformation module 1, a first PI controller 2, a first integration module 3, a second integration module 4, a third integration module 5, a first subtracter, a second subtracter, a third subtracter, a first adder, a second adder, a first switch K0, a second switch K1, a third switch K2, a permanent magnet wind turbine generator output active power input end, a permanent magnet wind turbine generator output power reference value input end, a virtual rotational inertia input end, a first divider, a frequency reference value input end, an active-frequency droop coefficient calculation module 17, a virtual synchronous ring output angle output end and a first inertia coefficient input end;
stator voltage of generator
、
And
the input end of the coordinate transformation module 1 is connected with the input end of the coordinate transformation module 1, the q-axis component output end of the coordinate transformation module 1 is connected with the input end of the first PI controller 2, the output end of the first PI controller 2 is connected with the input end of the first integration module 3, and the output end of the first integration module 3 is connected with the input end of the coordinate transformation module 1 and the first free end of the third switch K2;
the output active power input end of the permanent magnet wind turbine generator is connected with the output power reference value input end of the permanent magnet wind turbine generator and the input end of a first subtracter, the output end of the first subtracter is connected with the input end of a first adder, the output end of the first adder and the virtual rotary inertia input end of the first adder are connected with the input end of a first divider, the output end of the first divider is connected with the first free end of a first switch K0, the second free end of a first switch K0 is suspended, the fixed end of the first switch K0 is connected with the input end of a second adder through a second integration module 4, the output end of the second adder is connected with the input end of a second subtracter and the input end of a third integration module 5, the output end of the third integration module 5 is connected with the second free end of a third switch K2, the frequency reference value input end of the second subtracter is connected with the input end of the second subtracter, and the output end of the second subtracter is connected with the input end of an active-frequency droop coefficient calculation module 17 The output end of the active-frequency droop coefficient calculation module 17 is connected with the input end of the first adder, the output end of the third integration module 5 and the output end of the virtual synchronous ring output angle are connected with the input end of the third subtracter, the output end of the third subtracter and the input end of the first inertia coefficient are connected with the input end of the first multiplier, the output end of the first multiplier is connected with the first free end of the second switch K1, the second free end of the second switch K1 is suspended, the fixed end of the second switch K1 is connected with the input end of the second adder, and the fixed end of the second switch K1 is connected with the output end of the virtual synchronous ring output angle;
referring to fig. 5, the virtual synchronization ring reference voltage amplitude E calculation module includes a third adder, a fourth subtractor, a fifth subtractor, a sixth subtractor, a first numerical slow starter 6, a reactive-voltage droop coefficient calculation module 7, a permanent magnet wind turbine output reactive power reference value input terminal, a permanent magnet wind turbine output reactive power input terminal, a second inertia coefficient input terminal, a second multiplier, a fourth switch K3, a fourth integration module 8, a virtual synchronization ring reference voltage amplitude output terminal, a virtual synchronization ring output voltage amplitude input terminal, a virtual synchronization ring output voltage base value input terminal, and a third inertia coefficient input terminal;
the input end of the output reactive power reference value of the permanent magnet wind turbine generator set is connected with the input end of a third adder, the output end of the third adder and the input end of the output reactive power of the permanent magnet wind turbine generator set are connected with the input end of a fourth subtracter, the output end of the fourth subtracter and the input end of a second inertia coefficient are connected with the input end of a second multiplier, the output end of the second multiplier is connected with the input end of a first numerical value slow starter 6, the output end of the first numerical value slow starter 6 is connected with a first free end of a fourth switch K3, the fixed end of the fourth switch K3 is connected with the input end of a fourth integrating module 8, the output end of the fourth integrating module 8 is connected with the output end of a virtual synchronous ring reference voltage amplitude value and the input end of a fifth subtracter, the input end of the virtual synchronous ring subtracter output voltage amplitude value is connected with the input end of the fifth subtracter and the input end of the sixth subtracter, the output voltage basic value input end of the virtual synchronous ring is connected with the input end of a sixth subtracter, the output end of the sixth subtracter is connected with the input end of a reactive-voltage droop coefficient calculation module 7, the output end of the reactive-voltage droop coefficient calculation module 7 is connected with the input end of a third adder, the output end of a fifth subtracter and the third inertia coefficient input end are connected with the input end of a third multiplier, and the output end of the third multiplier is connected with the input end of a first numerical value slow starter 6 and the second free end of a fourth switch K3.
Referring to FIG. 6, the current reference value output by the grid side AC voltage control loop
The calculation module comprises a virtual synchronous ring output reference voltage amplitude output end, a converter output voltage d-axis component input end, a seventh subtracter, a second numerical value slow starter 9, a fifth switch K4, a second PI controller 10, a converter output voltage q-axis component input end, a virtual synchronous ring output angular frequency input end, a filter capacitor input end, a fourth multiplier, an eighth subtracter, a ninth subtracter, a tenth subtracter, an eleventh subtracter, a sixth switch K5, a third numerical value slow starter 11, a third PI controller 12, a seventh switch K6 and a current reference value output end output by a network side alternating current voltage control ring;
the output end of the virtual synchronous ring output reference voltage amplitude and the input end of the d-axis component of the converter output voltage are connected with the input end of a seventh subtracter, the output end of the seventh subtracter is connected with the input end of a second numerical value slow starter 9, the output end of the second numerical value slow starter 9 is connected with a first free end of a fifth switch K4, and the fixed end of a fifth switch K4 is connected with the input end of a second PI controller 10;
an input end of a q-axis component of an output voltage of the converter, an input end of a virtual synchronous ring output angular frequency and an input end of a filter capacitor are connected with an input end of a fourth multiplier, an output end of the fourth multiplier and an output end of the second PI controller 10 are connected with an input end of an eighth subtracter, an output end of the eighth subtracter is connected with an input end of a ninth subtracter and a first free end of a seventh switch K6, an output end of a grid-side alternating-current voltage control ring output current reference value is connected with an input end of the ninth subtracter, an output end of the ninth subtracter is connected with an input end of a second numerical value slow starter 9 and a second free end of a fifth switch K4, and a fixed end of a seventh switch K6 is connected with an output end of a grid-side alternating-current voltage control ring output current reference value;
the input end of the direct current voltage and the input end of the direct current voltage reference value are connected with the input end of a tenth subtracter, the output end of the tenth subtracter is connected with the input end of a third numerical value slow starter 11, the output end of the third numerical value slow starter 11 is connected with the first free end of a sixth switch K5, the output end of the current reference value output by an alternating current voltage control loop and the second free end of a seventh switch K6 are connected with the input end of an eleventh subtracter, the output end of the eleventh subtracter is connected with the second free end of a sixth switch K5 and the input end of a third PI controller 12, the fixed end of the sixth switch K5 is connected with the input end of a third PI controller 12, the output end of the third numerical value slow starter 11 is connected with the second free end of a seventh switch K6, and the output end of the third PI controller 12 is connected with the second free end of a seventh switch K6;
referring to FIG. 7, the machine side AC voltage control loop outputs the q-axis component of the current reference
The calculation module comprises a q-axis component input end of converter output voltage, a twelfth subtracter, a fourth numerical value slow starter 13, an eighth switch K7, a fourth PI controller 14, a d-axis component input end of converter output voltage, a virtual synchronous ring output angular frequency input end, a filter capacitor input end, a fifth multiplier, a fifth adder, a twelfth subtracter, a thirteenth subtracter, a ninth switch K8 and a q-axis component of machine side alternating voltage control ring output current reference value
The output end, the input end of the output reactive power parameter value of the permanent magnet wind motor and the d-axis component of the three-phase voltage of the-2/3 public connection point
An input terminal and a sixth multiplier;
the q-axis component input end of the converter output voltage is connected with the input end of a twelfth subtracter, the output end of the twelfth subtracter is connected with the input end of a fourth numerical value slow starter 13, the output end of the fourth numerical value slow starter 13 is connected with the first free end of an eighth switch K7, the fixed end of an eighth switch K7 is connected with the input end of a fourth PI controller 14, the converter output voltage d-axis component input end, the virtual synchronous loop output angular frequency input end and the filter capacitor input end are connected with the input end of a fifth multiplier, the output end of the fifth multiplier and the output end of a fourth PI controller 14 are connected with the input end of a fifth adder, the output end of the fifth adder is connected with the input end of a thirteenth subtracter and a first free end of a ninth switch K8, and the fixed end of the ninth switch K8 is connected with a q-axis component of the machine side alternating voltage control loop output current reference value.
The output ends are connected, and the machine side alternating voltage control loop outputs the q-axis component of the current reference value
The output end of the thirteenth subtractor is connected with the input end of the thirteenth subtractor, and the output end of the thirteenth subtractor is connected with the input end of the fourth numerical value slow starter 13 and the second free end of the eighth switch K7;
input end of output reactive power parameter value of permanent magnet wind motor and d-axis component of three-phase voltage of-2/3 public connection point
The input terminal is connected to the input terminal of the sixth multiplier, and the output terminal of the sixth multiplier is connected to the second free terminal of the eighth switch K7.
Referring to fig. 8, the d-axis component of the current reference value output from the machine side ac voltage control loop
The calculation module comprises a direct current voltage reference value input end, a direct current voltage input end, a fourteenth subtracter, a fifth numerical value slow starter 15, a tenth switch K9, a fifth PI controller 16, an eleventh switch K10 and a d-axis component of a current reference value output by a machine side alternating current voltage control loop
The output end, the fifteenth subtracter and the input end of the reference value of the reactive power output by the permanent magnet wind motor are connected with the d-axis component of the three-phase voltage of the-2/3 public connection point
An input terminal and a seventh multiplier;
the input end of the direct current voltage reference value is connected with the input end of a direct current voltage input end and the input end of a fourteenth subtracter, the output end of the fourteenth subtracter is connected with the input end of a fifth numerical value slow starter 15, the output end of the fifth numerical value slow starter 15 is connected with a first free end of a tenth switch K9, the fixed end of a tenth switch K9 is connected with the input end of a fifth PI controller 16, the output end of the fifth PI controller 16 is connected with a second free end of an eleventh switch K10 and the input end of a fifteenth subtracter, and the d-axis component of the current reference value output by the machine side alternating current voltage control loop
The output end of the second subtractor is connected with the fixed end of the eleventh switch K10 and the input end of the fifteenth subtractor, and the output end of the fifteenth subtractor is connected with the input end of the fourth PI controller 14 and the second free end of the tenth switch K9;
d-axis component of three-phase voltage of output reactive power reference value input end of permanent magnet wind motor and-2/3 public connection point
The input end of the first multiplier is connected with the input end of the fifth multiplier, and the output end of the fifth multiplier is connected with the first free end of the eleventh switch K10.
According to virtual synchronous ring output angle
Calculation module, virtual synchronous ring reference voltage amplitude E calculation module and current reference value output by network side alternating voltage control ring
D-axis component of current reference value output by calculation module and machine side alternating voltage control loop
And q-axis component
The specific process of switching the current source control mode and the voltage source control mode of the permanent magnet wind turbine generator set by the computing module is as follows:
the second free terminal of the first switch K0 is closed, the first free terminal of the second switch K1 is closed, the first free terminal of the third switch K2 is closed, the second free terminal of the fourth switch K3 is closed, the second free terminal of the fifth switch K4 is closed, the first free terminal of the sixth switch K5 is closed, the second free terminal of the seventh switch K6 is closed, the second free terminal of the eighth switch K7 is closed, the second free terminal of the ninth switch K8 is closed, the second free terminal of the tenth switch K9 is closed, the first free terminal of the eleventh switch K10 is closed, and the virtual synchronization ring output angle is determined according to the current
A virtual synchronous ring reference voltage amplitude E, a current reference value output by a network side alternating voltage control ring
And d-axis component of current reference value output by machine-side AC voltage control loop
And q-axis component
Controlling the permanent magnet wind motor to enable the permanent magnet wind motor to work in a current source control mode;
the first free end of the first switch K0 is closed, the second free end of the second switch K1 is closed, the second free end of the third switch K2 is closed, the first free end of the fourth switch K3 is closed, the first free end of the fifth switch K4 is closed, the second free end of the sixth switch K5 is closed, the first free end of the seventh switch K6 is closed, the first free end of the eighth switch K7 is closed, the first free end of the ninth switch K8 is closed, the first free end of the tenth switch K9 is closed, the second free end of the eleventh switch K10 is closed, and the virtual synchronization loop output angle is determined according to the first free end of the first switch K3878, the second free end of the second switch K1 is closed, the second free end of the sixth switch K5 is closed, the first free end of the seventh switch K6 is closed, the first free end of the eighth switch K3875 is closed, and the second free end of the eleventh switch K10 is closed
A virtual synchronous ring reference voltage amplitude E, a current reference value output by a network side alternating voltage control ring
And d-axis component of current reference value output by machine-side AC voltage control loop
And q-axis component
And controlling the permanent magnet wind motor to enable the permanent magnet wind motor to work in a voltage source control mode.
In addition, when the permanent magnet wind turbine generator is started for the first time, the starting angle synchronization control is performed, before the starting, the second free end in the first switch K0 is closed, the first free end in the second switch K1 is closed, and the first free end in the third switch K2 is closed, so that the permanent magnet direct-drive fan can be directly started in a current source control mode, and the permanent magnet fan can be started in a voltage source control mode after the synchronization is finished.
In addition, when the current source control mode is switched to the voltage source control mode, the numerical value slow starter acts, and the numerical value slow starter acquires numerical values Kn _ x at corresponding nodes, wherein n =3, 4, 7 and 9; x =1, 2, subscript n represents position number, subscript x represents state number, and control equation is controlled through numerical slow starter
(n =3, 4, 7, 9), the switching of Kn (n =3, 4, 7, 9) is completed. Wherein the content of the first and second substances,
for a set step size of the numerical slow starter,
and T is slow start time.
When the voltage source control mode is switched to the current source control mode, the numerical value slow starter acts, and the numerical value slow starter obtains a numerical value Kn _ x at a corresponding node, wherein n = 5; x =1, 2, subscript n represents position number, subscript x represents state number, and control equation is controlled through numerical slow starter
N =5, switching of Kn (n = 5) is completed, wherein,
for a set step size of the numerical slow starter,
and T is slow start time.
Claims (9)
1. A voltage source and current source dual-mode switching control method for a converter is characterized by comprising the following steps:
1) constructing virtual synch Ring output Angle
Calculation module, virtual synchronous ring reference voltage amplitude E calculation module and current reference value output by network side alternating voltage control ring
D-axis component of current reference value output by calculation module and machine side alternating voltage control loop
And q-axis component
A calculation module;
2) output angle using virtual synchronizer ring
Calculation module, virtual synchronous ring reference voltage amplitude E calculation module and current reference value output by network side alternating voltage control ring
D-axis component of current reference value output by calculation module and machine side alternating voltage control loop
And q-axis component
And the computing module switches a current source control mode and a voltage source control mode of the permanent magnet wind turbine generator.
2. The dual-mode switching control method for the voltage source and the current source of the converter as claimed in claim 1, wherein the virtual synchronization loop output angle is
The calculation module comprises the stator voltage of the generator
、
And
the device comprises an input end, a coordinate transformation module (1), a first PI controller (2), a first integration module (3), a second integration module (4), a third integration module (5), a first subtracter, a second subtracter, a third subtracter, a first adder, a second adder, a first switch (K0), a second switch (K1), a third switch (K2), a permanent magnet wind turbine generator output active power input end, a permanent magnet wind turbine generator output power reference value input end, a virtual rotational inertia input end, a first divider, a frequency reference value input end, an active-frequency droop coefficient calculation module (17), a virtual synchronous ring output angle output end and a first inertia coefficient input end;
stator voltage of generator
、
And
the input end of the coordinate transformation module (1) is connected with the input end of the coordinate transformation module (1), the q-axis component output end of the coordinate transformation module (1) is connected with the input end of the first PI controller (2), the output end of the first PI controller (2) is connected with the input end of the first integration module (3), and the output end of the first integration module (3) is connected with the input end of the coordinate transformation module (1) and the first free end of the third switch (K2);
the output active power input end of the permanent magnet wind turbine generator set is connected with the output power reference value input end of the permanent magnet wind turbine generator set and the input end of a first subtracter, the output end of the first subtracter is connected with the input end of a first adder, the output end of the first adder and the virtual rotational inertia input end of the first adder are connected with the input end of a first divider, the output end of the first divider is connected with the first free end of a first switch (K0), the second free end of the first switch (K0) is suspended, the fixed end of the first switch (K0) is connected with the input end of a second adder through a second integration module (4), the output end of the second adder is connected with the input end of a second subtracter and the input end of a third integration module (5), the output end of the third integration module (5) is connected with the second free end of a third switch (K2), and the frequency reference value input end of the second subtracter is connected with the input end of the second subtracter, the output end of the second subtracter is connected with the input end of an active-frequency droop coefficient calculation module (17), the output end of the active-frequency droop coefficient calculation module (17) is connected with the input end of the first adder, the output end of the third integration module (5) and the output end of the virtual synchronization ring output angle are connected with the input end of the third subtracter, the output end of the third subtracter and the input end of the first inertia coefficient are connected with the input end of the first multiplier, the output end of the first multiplier is connected with the first free end of the second switch (K1), the second free end of the second switch (K1) is suspended, the fixed end of the second switch (K1) is connected with the input end of the second adder, and the fixed end of the second switch (K1) is connected with the output end of the virtual synchronization ring output angle.
3. The voltage source and current source dual-mode switching control method for the converter according to claim 2, wherein the virtual synchronous ring reference voltage amplitude E calculation module comprises a third adder, a fourth subtractor, a fifth subtractor, a sixth subtractor, a first numerical slow starter (6), a reactive-voltage droop coefficient calculation module (7), a permanent magnet wind turbine output reactive power reference value input end, a permanent magnet wind turbine output reactive power input end, a second inertia coefficient input end, a second multiplier, a fourth switch (K3), a fourth integration module (8), a virtual synchronous ring reference voltage amplitude output end, a virtual synchronous ring output voltage amplitude input end, a virtual synchronous ring output voltage base value input end and a third inertia coefficient input end;
the input end of the reference value of the reactive power output by the permanent magnet wind turbine generator set is connected with the input end of a third adder, the output end of the third adder and the input end of the reactive power output by the permanent magnet wind turbine generator set are connected with the input end of a fourth subtracter, the output end of the fourth subtracter and the input end of a second inertia coefficient are connected with the input end of a second multiplier, the output end of the second multiplier is connected with the input end of a first numerical value slow starter (6), the output end of the first numerical value slow starter (6) is connected with the first free end of a fourth switch (K3), the fixed end of the fourth switch (K3) is connected with the input end of a fourth integration module (8), the output end of the fourth integration module (8) is connected with the output end of the reference voltage amplitude of a virtual synchronous ring and the input end of a fifth subtracter, the input end of the output voltage amplitude of the virtual synchronous ring is connected with the input end of the fifth subtracter and the input end of the sixth subtracter, the output voltage basic value input end of the virtual synchronous ring is connected with the input end of a sixth subtracter, the output end of the sixth subtracter is connected with the input end of a reactive-voltage droop coefficient calculation module (7), the output end of the reactive-voltage droop coefficient calculation module (7) is connected with the input end of a third adder, the output end of a fifth subtracter and the input end of a third inertia coefficient are connected with the input end of a third multiplier, and the output end of the third multiplier is connected with the input end of a first numerical value slow starter (6) and the second free end of a fourth switch (K3).
4. A voltage source and current source dual-mode switching control method for a current transformer as claimed in claim 3, wherein the current reference value of the net side ac voltage control loop output
The computing module comprises a virtual synchronous ring output reference voltage amplitude output end and a converter output voltage d-axis componentThe converter comprises an input end, a seventh subtracter, a second numerical value soft starter (9), a fifth switch (K4), a second PI controller (10), a converter output voltage q-axis component input end, a virtual synchronous ring output angular frequency input end, a filter capacitor input end, a fourth multiplier, an eighth subtracter, a ninth subtracter, a tenth subtracter, an eleventh subtracter, a sixth switch (K5), a third numerical value soft starter (11), a third PI controller (12), a seventh switch (K6) and a current reference value output end output by a network side alternating current voltage control ring;
the output end of the virtual synchronous ring output reference voltage amplitude and the input end of the d-axis component of the converter output voltage are connected with the input end of a seventh subtracter, the output end of the seventh subtracter is connected with the input end of a second numerical value slow starter (9), the output end of the second numerical value slow starter (9) is connected with a first free end of a fifth switch (K4), and the fixed end of the fifth switch (K4) is connected with the input end of a second PI controller (10);
the converter output voltage q-axis component input end, the virtual synchronous ring output angular frequency input end and the filter capacitor input end are connected with the input end of a fourth multiplier, the output end of the fourth multiplier and the output end of a second PI controller (10) are connected with the input end of an eighth subtracter, the output end of the eighth subtracter is connected with the input end of a ninth subtracter and a first free end of a seventh switch (K6), the grid-side alternating voltage control ring output current reference value output end is connected with the input end of the ninth subtracter, the output end of the ninth subtracter is connected with the input end of a second numerical value slow starter (9) and a second free end of a fifth switch (K4), and the fixed end of the seventh switch (K6) is connected with the current reference value output end of the grid-side alternating voltage control ring;
the direct current voltage input end and the direct current voltage reference value input end are connected with the input end of a tenth subtracter, the output end of the tenth subtracter is connected with the input end of a third numerical value slow starter (11), the output end of the third numerical value slow starter (11) is connected with the first free end of a sixth switch (K5), the current reference value output end output by an alternating current voltage control loop and the second free end of a seventh switch (K6) are connected with the input end of an eleventh subtracter, the output end of the eleventh subtracter is connected with the second free end of the sixth switch (K5) and the input end of a third PI controller (12), the fixed end of the sixth switch (K5) is connected with the input end of a third PI controller (12), the output end of the third numerical value slow starter (11) is connected with the second free end of a seventh switch (K6), and the output end of the third PI controller (12) is connected with the second free end of a seventh switch (K6).
5. A voltage-source current-source dual-mode switching control method for a converter as claimed in claim 4, wherein the machine side AC voltage control loop outputs q-axis component of current reference value
The calculation module comprises a q-axis component input end of converter output voltage, a twelfth subtracter, a fourth numerical value slow starter (13), an eighth switch (K7), a fourth PI controller (14), a converter output voltage d-axis component input end, a virtual synchronous ring output angular frequency input end, a filter capacitor input end, a fifth multiplier, a fifth adder, a twelfth subtracter, a thirteenth subtracter, a ninth switch (K8) and a q-axis component of a machine side alternating voltage control ring output current reference value
The output end, the input end of the output reactive power parameter value of the permanent magnet wind motor and the d-axis component of the three-phase voltage of the-2/3 public connection point
An input terminal and a sixth multiplier;
the q-axis component input end of the converter output voltage is connected with the input end of a twelfth subtracter, the output end of the twelfth subtracter is connected with the input end of a fourth numerical value slow starter (13), the output end of the fourth numerical value slow starter (13) is connected with a first free end of an eighth switch (K7), and an eighth switch (K7)K7) The fixed end of the second switch (K8) is connected with the input end of a fourth PI controller (14), the input end of a d-axis component of the output voltage of the converter, the input end of an angular frequency output end of the virtual synchronous ring and the input end of a filter capacitor are connected with the input end of a fifth multiplier, the output end of the fifth multiplier and the output end of the fourth PI controller (14) are connected with the input end of a fifth adder, the output end of the fifth adder is connected with the input end of a thirteenth subtracter and the first free end of a ninth switch (K8), and the fixed end of the ninth switch (K8) is connected with a q-axis component of a reference value of the output current of the machine side alternating voltage control ring
The output end is connected, and the machine side alternating voltage control loop outputs the q-axis component of the current reference value
The output end of the thirteenth subtractor is connected with the input end of a thirteenth subtractor, and the output end of the thirteenth subtractor is connected with the input end of a fourth numerical value slow starter (13) and the second free end of an eighth switch (K7);
input end of output reactive power parameter value of permanent magnet wind motor and d-axis component of three-phase voltage of-2/3 public connection point
The input terminal is connected to the input terminal of the sixth multiplier, and the output terminal of the sixth multiplier is connected to the second free terminal of the eighth switch (K7).
6. A voltage-source current-source dual-mode switching control method for a converter as claimed in claim 5, wherein the d-axis component of the current reference value outputted from the AC voltage control loop on the machine side
The calculation module comprises a direct-current voltage reference value input end, a direct-current voltage input end, a fourteenth subtracter, a fifth numerical value slow starter (15) and a tenth switch(K9) A d-axis component of the current reference value output by the fifth PI controller (16), the eleventh switch (K10) and the machine side alternating current voltage control loop
The output end, the fifteenth subtracter and the input end of the reference value of the reactive power output by the permanent magnet wind motor are connected with the d-axis component of the three-phase voltage of the-2/3 public connection point
An input terminal and a seventh multiplier;
the input end of a direct current voltage reference value is connected with the input end of a direct current voltage and the input end of a fourteenth subtracter, the output end of the fourteenth subtracter is connected with the input end of a fifth numerical value slow starter (15), the output end of the fifth numerical value slow starter (15) is connected with a first free end of a tenth switch (K9), the fixed end of the tenth switch (K9) is connected with the input end of a fifth PI controller (16), the output end of the fifth PI controller (16) is connected with a second free end of an eleventh switch (K10) and the input end of a fifteenth subtracter, and a d-axis component of a current reference value output by a machine side alternating current voltage control loop
The output end of the second subtractor is connected with the fixed end of a fifth switch (K10) and the input end of a fifteenth subtractor, and the output end of the fifteenth subtractor is connected with the input end of a fourth PI controller (14) and the second free end of a tenth switch (K9);
d-axis component of three-phase voltage of output reactive power reference value input end of permanent magnet wind motor and-2/3 public connection point
The input terminal is connected to the input terminal of the seventh multiplier, and the output terminal of the seventh multiplier is connected to the first free terminal of the eleventh switch (K10).
7. According to the rightA voltage-source current-source dual-mode switching control method for converters according to claim 6, characterized in that the second free terminal of the first switch (K0) is closed, the first free terminal of the second switch (K1) is closed, the first free terminal of the third switch (K2) is closed, the second free terminal of the fourth switch (K3) is closed, the second free terminal of the fifth switch (K4) is closed, the first free terminal of the sixth switch (K5) is closed, the second free terminal of the seventh switch (K6) is closed, the second free terminal of the eighth switch (K7) is closed, the second free terminal of the ninth switch (K8) is closed, the second free terminal of the tenth switch (K9) is closed, the first free terminal of the eleventh switch (K10) is closed, and the output angle of the synchronous loop at the moment is obtained
A virtual synchronous ring reference voltage amplitude E, a current reference value output by a network side alternating voltage control ring
And d-axis component of current reference value output by machine-side AC voltage control loop
And q-axis component
And controlling the permanent magnet wind motor to enable the permanent magnet wind motor to work in a current source control mode.
8. A voltage-source current-source dual-mode switching control method for converters according to claim 6, characterized in that a first free end of a first switch (K0) is closed, a second free end of a second switch (K1) is closed, a second free end of a third switch (K2) is closed, a first free end of a fourth switch (K3) is closed, a first free end of a fifth switch (K4) is closed, a second free end of a sixth switch (K5) is closed, and a seventh switch(K6) A first free end of the eighth switch (K7) is closed, a first free end of the ninth switch (K8) is closed, a first end of the tenth switch (K9) is closed, and a second free end of the eleventh switch (K10) is closed, according to the virtual synchronization ring output angle at the time
A virtual synchronous ring reference voltage amplitude E, a current reference value output by a network side alternating voltage control ring
And d-axis component of current reference value output by machine-side AC voltage control loop
And q-axis component
And controlling the permanent magnet wind motor to enable the permanent magnet wind motor to work in a voltage source control mode.
9. The dual-mode switching control method of the voltage source and the current source of the converter as claimed in claim 6, wherein when the voltage source control mode is required to be switched, the angle synchronization control is performed on the magnetic wind turbine generator set, and then the voltage source control mode is switched.
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| CN113938076A (en) * | 2021-11-02 | 2022-01-14 | 哈尔滨工业大学 | Double-mode operation switching control method for voltage source and current source of double-fed wind turbine generator |
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