CN115473277A - Impedance shaping method and device for near-power-frequency doubly-fed wind turbine generator - Google Patents
Impedance shaping method and device for near-power-frequency doubly-fed wind turbine generator Download PDFInfo
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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
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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
- H02J3/46—Controlling of the sharing of output between the generators, converters, or transformers
- H02J3/466—Scheduling the operation of the generators, e.g. connecting or disconnecting generators to meet a given demand
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02P—CONTROL OR REGULATION OF ELECTRIC MOTORS, ELECTRIC GENERATORS OR DYNAMO-ELECTRIC CONVERTERS; CONTROLLING TRANSFORMERS, REACTORS OR CHOKE COILS
- H02P21/00—Arrangements or methods for the control of electric machines by vector control, e.g. by control of field orientation
- H02P21/0003—Control strategies in general, e.g. linear type, e.g. P, PI, PID, using robust control
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02P—CONTROL OR REGULATION OF ELECTRIC MOTORS, ELECTRIC GENERATORS OR DYNAMO-ELECTRIC CONVERTERS; CONTROLLING TRANSFORMERS, REACTORS OR CHOKE COILS
- H02P21/00—Arrangements or methods for the control of electric machines by vector control, e.g. by control of field orientation
- H02P21/14—Estimation or adaptation of machine parameters, e.g. flux, current or voltage
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02P—CONTROL OR REGULATION OF ELECTRIC MOTORS, ELECTRIC GENERATORS OR DYNAMO-ELECTRIC CONVERTERS; CONTROLLING TRANSFORMERS, REACTORS OR CHOKE COILS
- H02P21/00—Arrangements or methods for the control of electric machines by vector control, e.g. by control of field orientation
- H02P21/14—Estimation or adaptation of machine parameters, e.g. flux, current or voltage
- H02P21/18—Estimation of position or speed
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02P—CONTROL OR REGULATION OF ELECTRIC MOTORS, ELECTRIC GENERATORS OR DYNAMO-ELECTRIC CONVERTERS; CONTROLLING TRANSFORMERS, REACTORS OR CHOKE COILS
- H02P21/00—Arrangements or methods for the control of electric machines by vector control, e.g. by control of field orientation
- H02P21/22—Current control, e.g. using a current control loop
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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
- H02J2203/00—Indexing scheme relating to details of circuit arrangements for AC mains or AC distribution networks
- H02J2203/20—Simulating, e g planning, reliability check, modelling or computer assisted design [CAD]
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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
- 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
- H02J2300/28—The renewable source being wind energy
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- 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
Abstract
The invention provides a near-power-frequency impedance shaping method and device for a doubly-fed wind turbine generator, and relates to the technical field of doubly-fed wind turbines, wherein the method comprises the following steps: performing parameter optimization operation on a machine side converter of the double-fed wind turbine generator; performing an impedance magnitude optimization operation on the impedance magnitude change caused by the parameter optimization operation; measuring impedance of the double-fed wind turbine generator, and judging whether preset requirements are met; in response to meeting the preset requirements, the impedance shaping operation is completed; and in response to the preset requirement not being met, returning to execute the parameter optimization operation or the impedance amplitude optimization operation. The near-power-frequency doubly-fed wind turbine generator impedance shaping method and device provided by the invention combine the links of machine side converter parameter optimization and impedance amplitude optimization, and can effectively reduce impedance phase under the condition that the impedance amplitude is basically unchanged at the near-power-frequency position.
Description
Technical Field
The invention relates to the technical field of double-fed wind turbine generators, in particular to a near-power-frequency impedance shaping method and device for a double-fed wind turbine generator.
Background
In recent years, large-scale wind power is usually in a centralized development and remote sending mode, and due to poor economy of a weak alternating current power grid, conventional direct current has inherent control limitation, and flexible direct sending is considered to be an ideal mode. However, the power generation end and the sending end of the large-scale wind turbine generator are both power electronic devices through the flexible direct sending-out system, the control is complex, the coupling is enhanced, and the system characteristics are obviously different from those of a traditional alternating current power system taking thermal power as a leading factor. With the increase of the grid-connected capacity of the wind turbine generator, a series of broadband oscillations appear in the flexible-straight engineering, including a subsynchronous frequency band (20-30 Hz), a near power frequency (40-45 Hz), a high frequency band (250-350 Hz) and the like.
At present, impedance shaping of a doubly-fed wind turbine generator is mainly aimed at interaction between the doubly-fed wind turbine generator and a series compensation circuit. The impedance of the series compensation circuit is changed from inductive transformation to capacitive transformation in a specific frequency band (around 20 Hz), the phase angle of the corresponding capacitive frequency band is reduced to within 90 degrees by the impedance shaping requirement of the corresponding double-fed wind turbine generator, and meanwhile, the impedance amplitude of the system in the adjacent frequency band is far smaller than that of the new energy on the opposite side, so that the impedance shaping has no special requirement on the amplitude.
And the impedance shaping to nearly power frequency department develops less at present, because the system impedance characteristic in the nearly power frequency section often is comparatively unanimous on the one hand, if phase place and the amplitude of optimizing back double-fed wind turbine generator impedance descend simultaneously, probably leads to the oscillation frequency skew, therefore for avoiding inducing new unstable mode, have higher requirement to phase angle and amplitude to impedance shaping. On the other hand, strict requirements cannot obviously influence power frequency, the additional control link is strictly selected, and the parameter adjustment range is limited.
Therefore, a near-power-frequency doubly-fed wind turbine generator impedance shaping method is urgently needed, and the impedance phase can be effectively reduced under the condition that the impedance amplitude is basically unchanged at the near-power-frequency position.
Disclosure of Invention
In view of the above, the present invention provides a near-power-frequency doubly-fed wind turbine impedance shaping method and apparatus, so as to solve at least one of the above mentioned problems.
In order to achieve the purpose, the invention adopts the following scheme:
according to a first aspect of the present invention, an embodiment of the present invention provides a near-power-frequency doubly-fed wind turbine generator impedance shaping method, where the method includes: performing parameter optimization operation on a machine side converter of the double-fed wind turbine generator; performing an impedance magnitude optimization operation on the impedance magnitude change caused by the parameter optimization operation; measuring impedance of the double-fed wind turbine generator, and judging whether preset requirements are met; in response to meeting the preset requirements, the impedance shaping operation is completed; and in response to the preset requirement not being met, returning to execute the parameter optimization operation or the impedance amplitude optimization operation.
Preferably, the parameter optimization operation performed on the doubly-fed wind turbine generator side converter in the above steps of this embodiment includes: and carrying out self-adaptive adjustment on the current inner loop PI parameter of the machine side converter of the double-fed wind turbine generator.
Preferably, the adaptively adjusting the current inner loop PI parameter of the doubly-fed wind turbine generator side converter in the above steps of this embodiment includes: independently adjusting d-axis PI parameters or q-axis PI parameters of a current loop according to the impedance characteristic of a near power frequency section; the method comprises the steps that a speed interval of the doubly-fed wind turbine generator is divided by a rated speed of 1500rpm, d-axis PI parameters and q-axis PI parameters of a current loop are respectively designed for different speed intervals, and self-adaptive switching is carried out when the unit detects different speeds.
Preferably, the impedance amplitude optimization operation performed in the above steps of this embodiment includes: and adding damping control operation to the machine side converter of the double-fed wind turbine generator.
Preferably, in the above steps of this embodiment, the operation of additionally controlling the damping of the machine-side converter of the doubly-fed wind turbine generator includes: and introducing negative feedback of rotor current, and transmitting the negative feedback to the current loop parameter control through a band-pass filter.
Preferably, the measuring impedance of the doubly-fed wind turbine generator in the above steps of this embodiment, and determining whether the impedance meets the preset requirement includes: and measuring the impedance of the doubly-fed wind turbine generator, judging whether the phase of the impedance to be corrected meets the phase requirement, and simultaneously judging whether the amplitude of the impedance to be corrected meets the amplitude requirement.
Preferably, in response to the preset requirement not being met in the above steps of this embodiment, the repeatedly performing the parameter optimization operation or the impedance magnitude optimization operation includes: responding to the situation that the phase of the impedance to be corrected does not reach the phase requirement, and returning to execute the parameter optimization operation and the subsequent steps; responding to the situation that the impedance amplitude to be corrected does not meet the amplitude requirement, and returning to execute impedance amplitude optimization operation and subsequent steps; and in response to the condition that the phase of the impedance to be corrected and the amplitude of the impedance to be corrected do not meet the requirements, returning to execute the parameter optimization operation and the subsequent steps.
According to a second aspect of the present invention, an embodiment of the present invention further provides an impedance shaping apparatus for a near-power-frequency doubly-fed wind turbine generator, where the apparatus includes: the parameter optimization unit is used for performing parameter optimization operation on the machine side converter of the double-fed wind turbine generator; an amplitude optimization unit for performing an impedance amplitude optimization operation on the impedance amplitude variation caused by the parameter optimization operation; the measurement judgment unit is used for measuring the impedance of the double-fed wind turbine generator, judging whether the preset requirement is met or not, and responding to the preset requirement being met, and finishing the impedance shaping operation; in response to the preset requirement not being satisfied, re-performing the parameter optimization operation by the parameter optimization unit or re-performing the impedance magnitude optimization operation by the magnitude optimization unit.
Preferably, the parameter optimization unit in the apparatus of this embodiment is specifically configured to: and carrying out self-adaptive adjustment on the current inner loop PI parameter of the machine side converter of the double-fed wind turbine generator.
Preferably, the parameter optimization unit in the apparatus of this embodiment is further specifically configured to: independently adjusting the d-axis PI parameter or the q-axis PI parameter of the current loop according to the impedance characteristic of the near power frequency section; the method comprises the steps that a speed interval of the doubly-fed wind turbine generator is divided by a rated speed of 1500rpm, d-axis PI parameters and q-axis PI parameters of a current loop are respectively designed for different speed intervals, and self-adaptive switching is carried out when the unit detects different speeds.
Preferably, the amplitude optimization unit in the apparatus of this embodiment is specifically configured to: and adding damping control operation to the machine side converter of the double-fed wind turbine generator.
Preferably, the amplitude optimization unit in the apparatus of this embodiment is further specifically configured to: and introducing negative feedback of the rotor current, and transmitting the negative feedback to the current loop parameter control through a band-pass filter.
Preferably, the measurement determining unit in the above apparatus of this embodiment is specifically configured to: and measuring the impedance of the doubly-fed wind turbine generator, judging whether the phase of the impedance to be corrected meets the phase requirement, and judging whether the amplitude of the impedance to be corrected meets the amplitude requirement.
Preferably, in the above apparatus of this embodiment, in response to the preset requirement not being met, the re-performing, by the parameter optimization unit, the parameter optimization operation or the re-performing, by the amplitude optimization unit, the impedance amplitude optimization operation includes: in response to the impedance phase to be corrected not reaching the phase requirement, the parameter optimization unit re-executes the parameter optimization operation, and then the amplitude optimization unit re-executes the impedance amplitude optimization operation; in response to the impedance amplitude to be corrected not reaching the amplitude requirement, re-executing impedance amplitude optimization operation by the amplitude optimization unit; and in response to the situation that the phase of the impedance to be corrected and the amplitude of the impedance to be corrected do not meet the requirements, the parameter optimization unit executes the parameter optimization operation again, and then the amplitude optimization unit executes the impedance amplitude optimization operation again.
According to a third aspect of the present invention, an embodiment of the present invention further provides an electronic device, which includes a memory, a processor, and a computer program stored on the memory and executable on the processor, and the processor implements the steps of the above method when executing the computer program.
According to a fourth aspect of the present invention, an embodiment of the present invention further provides a computer-readable storage medium, on which a computer program is stored, which, when executed by a processor, implements the steps of the above-mentioned method.
According to a fifth aspect of the present invention, an embodiment of the present invention further provides a computer program product, which includes a computer program/instruction, and when the computer program/instruction is executed by a processor, the steps of the above method are implemented.
The near-power-frequency doubly-fed wind turbine generator impedance shaping method and device provided by the invention combine the links of machine side converter parameter optimization and impedance amplitude optimization, and can effectively reduce impedance phase under the condition that the impedance amplitude is basically unchanged at the near-power-frequency position.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the embodiments or the prior art descriptions will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and other drawings can be obtained by those skilled in the art without creative efforts. In the drawings:
fig. 1 is a schematic flow diagram of an impedance shaping method for a near-power-frequency doubly-fed wind turbine generator set provided in an embodiment of the present application;
fig. 2 is a schematic flow diagram of a near-power-frequency impedance shaping method for a double-fed wind turbine generator according to another embodiment of the present application;
fig. 3 is a schematic diagram of changes in phase and amplitude of impedance after parameter optimization according to an embodiment of the present application;
FIG. 4 is a schematic diagram of introducing negative feedback of rotor current to current loop control provided by an embodiment of the present application;
FIG. 5 is a schematic diagram of an impedance value after parameter optimization and additional damping control according to an embodiment of the present application;
fig. 6 is a schematic structural diagram of an impedance shaping device of a near-power-frequency doubly-fed wind turbine generator set provided in an embodiment of the present application;
fig. 7 is a schematic structural diagram of an electronic device according to an embodiment of the present application.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present invention more apparent, the embodiments of the present invention are further described in detail below with reference to the accompanying drawings. The exemplary embodiments and descriptions of the present invention are provided to explain the present invention, but not to limit the present invention.
Fig. 1 is a schematic flow diagram of an impedance shaping method for a near-power-frequency doubly-fed wind turbine generator, provided by an embodiment of the present application, and the method includes the following steps:
step S101: and performing parameter optimization operation on the machine side converter of the double-fed wind turbine generator.
In this embodiment, the step is a parameter optimization operation performed on a control link of the machine-side converter of the doubly-fed wind turbine generator, and the main purpose is to reduce the impedance phase of the doubly-fed wind turbine generator. Such as adjusting the current loop PI parameters.
Step S102: and performing an impedance magnitude optimization operation on the impedance magnitude change caused by the parameter optimization operation.
Because the impedance characteristics of the system in the near power frequency section are often relatively consistent, if the impedance amplitude of the doubly-fed wind turbine generator is greatly changed after the parameter optimization in the step S101, for example, the impedance amplitude and the impedance phase are greatly reduced, oscillation frequency deviation may be caused, and therefore, the impedance amplitude needs to be optimized through the step. The impedance amplitude optimization operation can be realized by adding damping control to the doubly-fed wind turbine generator side converter, for example, rotor current negative feedback is introduced, and the feedback is transmitted to current loop parameter control through a band-pass filter.
Step S103: and measuring the impedance of the double-fed wind turbine generator, and judging whether the impedance meets the preset requirement.
After the optimization of the step S101 and the step S102, the impedance of the double-fed wind turbine generator is measured, and whether the measurement result meets the preset requirement or not is judged. In fact, whether the impedance phase and the impedance amplitude meet the preset requirements is judged through the measurement result.
Step S104: in response to meeting the preset requirements, the impedance shaping operation is completed.
Step S105: and in response to the preset requirement not being met, returning to execute the parameter optimization operation or the impedance amplitude optimization operation. Specifically, if the impedance phase does not satisfy the preset requirement, the method returns to step S101 to re-execute the parameter optimization operation, and continues to sequentially execute step S102 and step S103. If the impedance amplitude does not satisfy the preset requirement, the process returns to step S102, and step S103 is sequentially performed.
As described above, the impedance shaping method for the near-power-frequency doubly-fed wind turbine generator set provided by the embodiment of the present invention combines the parameters optimization and the impedance amplitude optimization link of the machine-side converter, and can effectively reduce the impedance phase under the condition that the impedance amplitude at the near-power-frequency position is basically unchanged.
Fig. 2 is a schematic flow chart of a near-power-frequency impedance shaping method for a double-fed wind turbine generator, according to another embodiment of the present application, where the method includes the following steps:
step S201: and performing self-adaptive adjustment on the current inner loop PI parameter of the machine side converter of the double-fed wind turbine generator.
The typical transfer function of the current loop is shown in equation (1):
in the above formula, k pi_d And k ii_d Is the d-axis PI parameter, k, of the current loop pi_q And k ii_q For the q-axis PI parameter of the current loop, G i_dq Typical transfer functions for current loops.
Preferably, in practical application, in order to avoid influencing power frequency operation characteristics, the parameter adjustment range of the control link is limited, so that d-axis PI parameters of a current loop or q-axis PI parameters of the current loop can be independently adjusted according to the impedance characteristics of a near power frequency section; the method comprises the steps that a speed interval of the doubly-fed wind turbine generator is divided by a rated speed of 1500rpm, d-axis PI parameters and q-axis PI parameters of a current loop are respectively designed for different speed intervals, and self-adaptive switching is carried out when the unit detects different speeds.
Through verification, the impedance phase angle can be effectively reduced by adjusting the parameters of the machine side converter of the doubly-fed wind turbine generator, but the impedance amplitude value can be greatly reduced, as shown in fig. 3, a schematic diagram of the change of the impedance phase position and the impedance amplitude value after parameter optimization provided by the embodiment of the application is shown in fig. 3, it can be seen from fig. 3 that the initial impedance phase angle in the diagram is-121 degrees, which is equivalent to 239 degrees for convenience of description, and the impedance phase position after parameter optimization is reduced by 70 degrees, but the impedance amplitude value is reduced to 0.45 time of the initial value.
Step S202: and adding damping control operation to the machine side converter of the double-fed wind turbine generator.
In this embodiment, this step can be implemented by introducing negative feedback of the rotor current, for example, and transmitting the negative feedback to the current loop input reference value through a band-pass filter, as shown in the following equations (2), (3) and fig. 4:
in the above formula: h com For the band-pass filter transfer function, zeta is the damping ratio, omega n ＝2πf n Is the center angular frequency, K is the gain factor, Q is the quality factor, BW is the bandwidth, s is the complex variable defined in the transfer function, f n Is the center frequency.
As shown in fig. 4, the current loop control diagram is input as the difference between the reference value of the d-axis and q-axis rotor current and the corresponding measured value, and the reference value of the d-axis and q-axis rotor voltage is output through the control of the current loop. And on the basis, additional damping control is introduced, namely a part outlined by a dotted line in the figure, and the input of the additional damping control is a rotor current measurement value which is negatively fed back by a band-pass filter and is output to a rotor current reference value.
The impedance amplitude of the specified frequency band can be further improved by adjusting the gain coefficient, the quality factor and the bandwidth of the band-pass filter. The quality factor is 0.75, the bandwidth is 10-20 Hz, the gain coefficient is-1.5 to-2.5, the impedance amplitude value close to the power frequency position is effectively increased, but the impedance phase position is slightly increased.
Step S203: and measuring the impedance of the doubly-fed wind turbine generator, judging whether the phase of the impedance to be corrected meets the phase requirement, and simultaneously judging whether the amplitude of the impedance to be corrected meets the amplitude requirement. If the phase of the impedance to be corrected and the amplitude of the impedance to be corrected simultaneously meet the requirements, impedance shaping is completed; if the phase of the impedance to be corrected does not meet the requirement and the amplitude of the impedance to be corrected meets the requirement, the step S201 is returned to; if the phase of the impedance to be corrected meets the requirement and the amplitude of the impedance to be corrected does not meet the requirement, the step S202 is returned to; if the phase of the impedance to be corrected and the amplitude of the impedance to be corrected do not meet the requirements, the process returns to step S201, that is, the priority of the phase of the impedance to be corrected is higher than the amplitude of the impedance to be corrected, and as long as the phase of the impedance to be corrected does not meet the requirements, the process returns to step S201 to re-execute the shaping method of the present application.
In this embodiment, the phase requirement in the above determination may be set by itself according to different flexible-straight system characteristics and shaping standards, and the amplitude requirement may also be set by itself according to requirements, for example, the amplitude of the impedance to be corrected needs to be greater than 80% of the original amplitude.
Through the steps, the impedance characteristic of the doubly-fed wind generator set at the position close to the power frequency can be effectively improved, as shown in fig. 5, an impedance schematic diagram is provided by the embodiment of the application after parameter optimization and additional damping control, as can be seen from fig. 5, the phase angle of the optimized 44Hz impedance is reduced from 238 degrees to 168 degrees, the amplitude is basically kept unchanged, and the impedance characteristic is improved.
As described above, the impedance shaping method for the near-power-frequency doubly-fed wind turbine generator set provided by the embodiment of the present invention combines the parameters optimization and the impedance amplitude optimization link of the machine-side converter, and can effectively reduce the impedance phase under the condition that the impedance amplitude at the near-power-frequency position is basically unchanged.
Fig. 6 is a schematic structural diagram of an impedance shaping device of a near-power-frequency doubly-fed wind turbine generator provided in an embodiment of the present application, where the device includes: the device comprises a parameter optimization unit 610, a magnitude optimization unit 620 and a measurement judgment unit 630, wherein the magnitude optimization unit 620 is respectively connected with the parameter optimization unit 610 and the measurement judgment unit 630, and the parameter optimization unit 610 is further connected with the measurement judgment unit 630.
The parameter optimization unit 610 is configured to perform parameter optimization operation on the doubly-fed wind turbine generator side converter.
The magnitude optimizing unit 620 is configured to perform an impedance magnitude optimizing operation on the impedance magnitude variation resulting from the parameter optimizing operation.
The measurement and judgment unit 630 is used for measuring the impedance of the doubly-fed wind turbine generator, judging whether the impedance meets a preset requirement, and completing impedance shaping operation in response to the preset requirement being met; in response to the preset requirement not being satisfied, the parameter optimization operation is re-performed by the parameter optimization unit 610 or the impedance magnitude optimization operation is re-performed by the magnitude optimization unit 620.
Preferably, the parameter optimization unit 610 may be specifically configured to: and performing self-adaptive adjustment on the current inner loop PI parameter of the machine side converter of the double-fed wind turbine generator.
Preferably, the parameter optimization unit 610 may further specifically be configured to: independently adjusting the d-axis PI parameter or the q-axis PI parameter of the current loop according to the impedance characteristic of the near power frequency section; the speed interval of the doubly-fed wind turbine generator is divided by a rated speed of 1500rpm, d-axis PI parameters and q-axis PI parameters of a current loop are respectively designed for different speed intervals, and self-adaptive switching is performed when the doubly-fed wind turbine generator detects different speeds.
Preferably, the amplitude optimization unit 620 is specifically configured to: and adding damping control operation to the machine side converter of the double-fed wind turbine generator.
Preferably, the amplitude optimization unit 620 may be further specifically configured to: and introducing negative feedback of rotor current, and transmitting the negative feedback to the current loop parameter control through a band-pass filter.
Preferably, the measurement determining unit 630 is specifically configured to: and measuring the impedance of the doubly-fed wind turbine generator, judging whether the phase of the impedance to be corrected meets the phase requirement, and judging whether the amplitude of the impedance to be corrected meets the amplitude requirement.
Preferably, in response to the preset requirement not being satisfied, the re-performing of the parameter optimization operation by the parameter optimization unit 610 or the re-performing of the impedance magnitude optimization operation by the magnitude optimization unit 620 includes:
in response to the impedance phase to be corrected not reaching the phase requirement, the parameter optimization unit 610 re-performs the parameter optimization operation, and then the amplitude optimization unit 620 re-performs the impedance amplitude optimization operation;
in response to the impedance amplitude to be corrected not reaching the amplitude requirement, the impedance amplitude optimization operation is re-performed by the amplitude optimization unit 620;
in response to the situation that the phase of the impedance to be corrected and the amplitude of the impedance to be corrected do not meet the requirement, the parameter optimization unit 610 re-performs the parameter optimization operation, and then the amplitude optimization unit 620 re-performs the impedance amplitude optimization operation.
For specific description of the above units, reference may be made to the response description of the foregoing method embodiment, and details are not repeated here.
As described above, the impedance shaping device for the near-power-frequency doubly-fed wind turbine generator, provided by the embodiment of the invention, combines the links of parameter optimization and impedance amplitude optimization of the machine-side converter, and can effectively reduce the impedance phase under the condition that the impedance amplitude at the near-power-frequency position is basically unchanged.
Fig. 7 is a schematic diagram of an electronic device provided in an embodiment of the present invention. The electronic device shown in fig. 7 is a general-purpose data processing apparatus comprising a general-purpose computer hardware structure including at least a processor 801 and a memory 802. The processor 801 and the memory 802 are connected by a bus 803. The memory 802 is adapted to store one or more instructions or programs that are executable by the processor 801. The one or more instructions or programs are executed by the processor 801 to implement the steps of the source network load store interactive operation method described above.
The processor 801 may be a stand-alone microprocessor or a collection of one or more microprocessors. Thus, the processor 801 implements the processing of data and the control of other devices by executing commands stored in the memory 802 to thereby execute the method flows of embodiments of the present invention as described above. The bus 803 connects the above components together, and also connects the above components to a display controller 804 and a display device and an input/output (I/O) device 805. Input/output (I/O) devices 805 may be a mouse, keyboard, modem, network interface, touch input device, motion sensitive input device, printer, and other devices known in the art. Typically, input/output (I/O) devices 805 are connected to the system through an input/output (I/O) controller 806.
The memory 802 may store, among other things, software components such as an operating system, communication modules, interaction modules, and application programs. Each of the modules and applications described above corresponds to a set of executable program instructions that perform one or more functions and methods described in embodiments of the invention.
The embodiment of the invention further provides a computer-readable storage medium, on which a computer program is stored, and when the computer program is executed by a processor, the steps of the impedance shaping method for the near-power-frequency doubly-fed wind turbine generator are implemented.
The embodiment of the invention also provides a computer program product, which comprises a computer program/instruction, and the computer program/instruction is executed by a processor to realize the steps of the near-power-frequency doubly-fed wind turbine generator impedance shaping method.
In summary, the impedance shaping method and apparatus for the near-power-frequency doubly-fed wind turbine generator set provided by the invention combine the optimization of the parameters of the machine-side converter and the optimization of the impedance amplitude, and can effectively reduce the impedance phase under the condition that the impedance amplitude is basically unchanged at the near-power-frequency position.
The preferred embodiments of the present invention have been described above with reference to the accompanying drawings. The many features and advantages of the embodiments are apparent from the detailed specification, and thus, it is intended by the appended claims to cover all such features and advantages of the embodiments which fall within the true spirit and scope thereof. Further, since numerous modifications and changes will readily occur to those skilled in the art, it is not desired to limit the embodiments of the invention to the exact construction and operation illustrated and described, and accordingly, all suitable modifications and equivalents may be resorted to, falling within the scope thereof.
As will be appreciated by one skilled in the art, embodiments of the present invention may be provided as a method, system, or computer program product. Accordingly, the present invention may take the form of an entirely hardware embodiment, an entirely software embodiment or an embodiment combining software and hardware aspects. Furthermore, the present invention 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 invention is described with reference to flowchart illustrations and/or block diagrams of methods, apparatus (systems), and computer program products according to embodiments of the invention. It will be understood that each flow and/or block of the flowchart illustrations and/or block diagrams, and combinations of flows and/or blocks in the flowchart illustrations 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.
The above-mentioned embodiments are provided to further explain the objects, technical solutions and advantages of the present invention in detail, and it should be understood that the above-mentioned embodiments are only examples of the present invention and should not be used to limit the scope of the present invention, and any modifications, equivalents, improvements and the like made within the spirit and principle of the present invention should be included in the scope of the present invention.
Claims (17)
1. A near-power-frequency doubly-fed wind turbine generator impedance shaping method is characterized by comprising the following steps:
performing parameter optimization operation on a machine side converter of the double-fed wind turbine generator;
performing an impedance magnitude optimization operation on the impedance magnitude change caused by the parameter optimization operation;
measuring impedance of the double-fed wind turbine generator, and judging whether preset requirements are met;
in response to meeting the preset requirements, the impedance shaping operation is completed;
and in response to the preset requirement not being met, returning to execute the parameter optimization operation or the impedance amplitude optimization operation.
2. The impedance shaping method for the doubly-fed wind turbine generator set according to claim 1, wherein the performing the parameter optimization operation on the machine-side converter of the doubly-fed wind turbine generator set comprises: and performing self-adaptive adjustment on the current inner loop PI parameter of the machine side converter of the double-fed wind turbine generator.
3. The impedance shaping method for the doubly-fed wind turbine generator as claimed in claim 2, wherein the adaptively adjusting the current inner loop PI parameter of the machine-side converter of the doubly-fed wind turbine generator comprises:
independently adjusting the d-axis PI parameter or the q-axis PI parameter of the current loop according to the impedance characteristic of the near power frequency section;
the speed interval of the doubly-fed wind turbine generator is divided by a rated speed of 1500rpm, d-axis PI parameters and q-axis PI parameters of a current loop are respectively designed for different speed intervals, and self-adaptive switching is performed when the doubly-fed wind turbine generator detects different speeds.
4. The impedance shaping method of the doubly-fed wind turbine generator set according to claim 1, wherein the performing the impedance amplitude optimization operation includes: and adding damping control operation to the machine side converter of the double-fed wind turbine generator.
5. The doubly-fed wind turbine generator impedance shaping method of claim 4, wherein the additional damping control operation on the doubly-fed wind turbine generator side converter comprises: and introducing negative feedback of the rotor current, and transmitting the negative feedback to the current loop parameter control through a band-pass filter.
6. The impedance shaping method of the doubly-fed wind turbine generator set according to claim 1, wherein the measuring impedance of the doubly-fed wind turbine generator set and the determining whether the impedance shaping method meets the preset requirement include: and measuring the impedance of the doubly-fed wind turbine generator, judging whether the phase of the impedance to be corrected meets the phase requirement, and judging whether the amplitude of the impedance to be corrected meets the amplitude requirement.
7. The doubly-fed wind turbine generator impedance shaping method of claim 6, wherein the repeatedly performing the parameter optimization operation or the impedance magnitude optimization operation in response to not satisfying a preset requirement comprises:
responding to the situation that the phase of the impedance to be corrected does not reach the phase requirement, and returning to execute the parameter optimization operation and the subsequent steps;
responding to the situation that the impedance amplitude to be corrected does not reach the amplitude requirement, and returning to execute the impedance amplitude optimization operation and the subsequent steps;
and in response to the condition that the phase of the impedance to be corrected and the amplitude of the impedance to be corrected do not meet the requirements, returning to execute the parameter optimization operation and the subsequent steps.
8. The utility model provides a nearly double-fed wind turbine generator system impedance moulding device of power frequency, its characterized in that, the device includes:
the parameter optimization unit is used for performing parameter optimization operation on the machine side converter of the double-fed wind turbine generator;
an amplitude optimization unit for performing an impedance amplitude optimization operation on the impedance amplitude variation caused by the parameter optimization operation;
the measurement judgment unit is used for measuring the impedance of the double-fed wind turbine generator, judging whether the preset requirement is met or not, and responding to the condition that the preset requirement is met, and finishing the impedance shaping operation; in response to the preset requirement not being satisfied, re-performing the parameter optimization operation by the parameter optimization unit or re-performing the impedance magnitude optimization operation by the magnitude optimization unit.
9. The impedance shaping device for the doubly-fed wind turbine generator set according to claim 8, wherein the parameter optimization unit is specifically configured to: and carrying out self-adaptive adjustment on the current inner loop PI parameter of the machine side converter of the double-fed wind turbine generator.
10. The impedance shaping device for the doubly-fed wind turbine generator set according to claim 9, wherein the parameter optimization unit is further specifically configured to: independently adjusting the d-axis PI parameter or the q-axis PI parameter of the current loop according to the impedance characteristic of the near power frequency section; the method comprises the steps that a speed interval of the doubly-fed wind turbine generator is divided by a rated speed of 1500rpm, d-axis PI parameters and q-axis PI parameters of a current loop are respectively designed for different speed intervals, and self-adaptive switching is carried out when the unit detects different speeds.
11. The impedance shaping device for the doubly-fed wind turbine generator set according to claim 8, wherein the amplitude optimization unit is specifically configured to: and adding damping control operation to the machine side converter of the double-fed wind turbine generator.
12. The impedance shaping device for the doubly-fed wind turbine generator set according to claim 11, wherein the amplitude optimization unit is further specifically configured to: and introducing negative feedback of the rotor current, and transmitting the negative feedback to the current loop parameter control through a band-pass filter.
13. The impedance shaping device for the doubly-fed wind turbine generator set according to claim 8, wherein the measurement and judgment unit is specifically configured to: and measuring the impedance of the doubly-fed wind turbine generator, judging whether the phase of the impedance to be corrected meets the phase requirement, and simultaneously judging whether the amplitude of the impedance to be corrected meets the amplitude requirement.
14. The impedance shaping device of claim 13, wherein the response to not meeting the preset requirement, the re-performing of the parameter optimization operation by the parameter optimization unit or the re-performing of the impedance magnitude optimization operation by the magnitude optimization unit comprises:
in response to the impedance phase to be corrected not reaching the phase requirement, the parameter optimization unit re-executes the parameter optimization operation, and then the amplitude optimization unit re-executes the impedance amplitude optimization operation;
in response to the impedance amplitude to be corrected not reaching the amplitude requirement, re-performing impedance amplitude optimization operation by the amplitude optimization unit;
and in response to the situation that the phase of the impedance to be corrected and the amplitude of the impedance to be corrected do not meet the requirements, the parameter optimization unit executes the parameter optimization operation again, and then the amplitude optimization unit executes the impedance amplitude optimization operation again.
15. An electronic device comprising a memory, a processor and a computer program stored on the memory and executable on the processor, characterized in that the steps of the method of any of claims 1 to 7 are implemented when the computer program is executed by the processor.
16. A computer-readable storage medium, on which a computer program is stored, which, when being executed by a processor, carries out the steps of the method of any one of claims 1 to 7.
17. A computer program product comprising computer programs/instructions, characterized in that the computer programs/instructions, when executed by a processor, implement the steps of the method of any of claims 1 to 7.
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