CN113078681A - High-low voltage ride through control method and system based on dynamic voltage instruction value - Google Patents

High-low voltage ride through control method and system based on dynamic voltage instruction value Download PDF

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CN113078681A
CN113078681A CN202110527478.XA CN202110527478A CN113078681A CN 113078681 A CN113078681 A CN 113078681A CN 202110527478 A CN202110527478 A CN 202110527478A CN 113078681 A CN113078681 A CN 113078681A
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instruction value
value
voltage
stator
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CN113078681B (en
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王辉
王艺霏
邢阳
谢凌博
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Shandong University
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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
    • 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]
    • 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
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E40/00—Technologies for an efficient electrical power generation, transmission or distribution
    • Y02E40/30—Reactive power compensation

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Abstract

The invention relates to a high-low voltage ride through control method and a system based on a dynamic voltage instruction value, comprising the following steps: obtaining a generation model of a reactive component instruction value for the obtained stator dynamic voltage instruction value based on a proportionality coefficient; carrying out constant deformation on the dynamic voltage instruction value of the stator, and carrying out equivalent treatment on the generation model of the reactive component instruction value to obtain an equivalent model of the voltage instruction value and the reactive current instruction value under the normal operation working condition; obtaining a value range of the proportionality coefficient according to the equivalent model of the voltage instruction value and the reactive current instruction value; and controlling the high-low voltage ride through according to the value of the proportionality coefficient. The method for selecting the proportionality coefficient is very simple, the value of the proportionality coefficient is only related to the mutual inductance parameter in the motor, the realization of a control scheme is easy, and the method is favorable for improving the high-low voltage ride through operation capacity of a wind power system.

Description

High-low voltage ride through control method and system based on dynamic voltage instruction value
Technical Field
The invention relates to the technical field of wind power generation system fault voltage ride-through control, in particular to a high-low voltage ride-through control method and system based on a dynamic voltage instruction value.
Background
The statements in this section merely provide background information related to the present disclosure and may not necessarily constitute prior art.
At present, wind power is in a steadily rising development trend, and the wind power rapidly becomes an important component for building a low-carbon power grid due to the advantage of green and clean energy. With the continuous penetration of the wind turbine generator set in the power grid in a high proportion and a large scale, the safe and stable operation of the power grid faces more serious challenges. The problem of large-area chain off-line caused by the fact that the wind turbine generator does not have fault voltage ride-through capability is more prominent. Therefore, there is a need to complete the research on the low and high voltage ride through technology of the wind power system.
Considering that in the existing wind power system fault ride-through control schemes, most of the control modes still need to be switched, and generally only a single control target can be realized, that is, only low-voltage ride-through operation or high-voltage ride-through operation of the wind turbine generator can be realized, how to simultaneously realize low-voltage ride-through capability and high-voltage ride-through capability is one of the difficult problems to be solved urgently, and related parameter selection and design become a key link for ensuring that the control system obtains good control performance.
Disclosure of Invention
In order to solve the problems, the invention provides a high and low voltage ride through control method and a system based on a dynamic voltage instruction value.
In order to achieve the purpose, the invention adopts the following technical scheme:
in a first aspect, the present invention provides a high-low voltage ride through control method based on a dynamic voltage command value, including:
obtaining a generation model of a reactive component instruction value for the obtained stator dynamic voltage instruction value based on a proportionality coefficient;
carrying out constant deformation on the dynamic voltage instruction value of the stator, and carrying out equivalent treatment on the generation model of the reactive component instruction value to obtain an equivalent model of the voltage instruction value and the reactive current instruction value under the normal operation working condition;
obtaining a value range of the proportionality coefficient according to the equivalent model of the voltage instruction value and the reactive current instruction value;
and controlling the high-low voltage ride through according to the value of the proportionality coefficient.
In a second aspect, the present invention provides a high-low voltage ride through control system based on a dynamic voltage command value, including:
the proportional coefficient introducing module is configured to obtain a generation model of a reactive component instruction value for the obtained stator dynamic voltage instruction value based on a proportional coefficient;
the equivalent model building module is configured to perform constant deformation on the dynamic voltage instruction value of the stator and perform equivalent processing on the generation model of the reactive component instruction value to obtain an equivalent model of the voltage instruction value and the reactive current instruction value under the normal operating condition;
the value range determining module is configured to obtain a value range of the proportionality coefficient according to the equivalent model of the voltage instruction value and the reactive current instruction value;
and the ride-through control module is configured to control high and low voltage ride-through according to the value of the proportionality coefficient.
In a third aspect, the present invention provides an electronic device comprising a memory and a processor, and computer instructions stored on the memory and executed on the processor, wherein when the computer instructions are executed by the processor, the method of the first aspect is performed.
In a fourth aspect, the present invention provides a computer readable storage medium for storing computer instructions which, when executed by a processor, perform the method of the first aspect.
Compared with the prior art, the invention has the beneficial effects that:
proportionality coefficient K in the invention1、K2Is only selected to be the mutual inductance parameter L between the stator and the rotor in the wind driven generatormTherefore, the high-low voltage ride through control strategy based on the change of the dynamic voltage command value is easy to realize, and the good control performance can be realized by correcting the proportionality coefficient K in time1、K2Is implemented.
Advantages of additional aspects of the invention will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention.
Drawings
The accompanying drawings, which are incorporated in and constitute a part of this specification, are included to provide a further understanding of the invention, and are incorporated in and constitute a part of this specification, illustrate exemplary embodiments of the invention and together with the description serve to explain the invention and not to limit the invention.
Fig. 1 is a schematic diagram of a reactive component command value generation module based on a dynamic voltage command value according to embodiment 1 of the present invention;
fig. 2 is a generalized schematic diagram of a reactive component instruction value generation module provided in embodiment 1 of the present invention;
fig. 3 is a schematic diagram of a reactive component instruction value generation module after equivalent processing according to embodiment 1 of the present invention;
fig. 4 is a schematic diagram of an equivalent series structure under a normal operating condition according to embodiment 1 of the present invention;
FIG. 5 shows the proportionality coefficient K provided in example 1 of the present invention1And K2Schematic diagram of the general form of the participating equivalent series structures;
FIGS. 6(a) -6(d) show the symmetrical sudden increase of the grid voltage to 1.3 times the high voltage provided in embodiment 1 of the present invention, with the selection of the scaling factor K10.06 and K2When the voltage is 5.5, comparing the voltage amplitude of the machine terminal, the output reactive power of the DFIG, the stator flux linkage amplitude and the simulation waveform of the electromagnetic torque;
fig. 7(a) -7(d) show that the grid voltage provided by embodiment 1 of the present invention falls symmetrically to 0.7 times of the low voltage, and the scaling factor K is selected10.13 and K2And when the voltage is 2.6, comparing the voltage amplitude of the machine terminal, the output reactive power of the DFIG, the flux linkage amplitude of the stator and the simulation waveform of the electromagnetic torque.
The specific implementation mode is as follows:
the invention will be further illustrated with reference to the following examples and drawings:
it is to be understood that the following detailed description is exemplary and is intended to provide further explanation of the invention as claimed. Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs.
It is noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of exemplary embodiments according to the invention. As used herein, the singular forms "a", "an", and "the" are intended to include the plural forms as well, unless the context clearly indicates otherwise, and it should be understood that the terms "comprises" and "comprising", and any variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, system, article, or apparatus that comprises a list of steps or elements is not necessarily limited to those steps or elements expressly listed, but may include other steps or elements not expressly listed or inherent to such process, method, article, or apparatus.
The embodiments and features of the embodiments of the present invention may be combined with each other without conflict.
Example 1
The embodiment provides a high-low voltage ride through control method based on a dynamic voltage command value, which comprises the following steps:
s1: obtaining a generation model of a reactive component instruction value for the obtained stator dynamic voltage instruction value based on a proportionality coefficient;
s2: carrying out constant deformation on the dynamic voltage instruction value of the stator, and carrying out equivalent treatment on the generation model of the reactive component instruction value to obtain an equivalent model of the voltage instruction value and the reactive current instruction value under the normal operation working condition;
s3: obtaining a value range of the proportionality coefficient according to the equivalent model of the voltage instruction value and the reactive current instruction value;
s4: and controlling the high-low voltage ride through according to the value of the proportionality coefficient.
In the step S1, fig. 1 shows the reactive current command value in the high-low voltage ride through control based on the dynamic voltage command value change
Figure BDA0003066578500000051
Considering that the doubly-fed asynchronous generators of different models haveIn the embodiment, the voltage open-loop control structure shown in fig. 1 is changed into the general form shown in fig. 2 according to different motor parameters, and K is introduced1And K2Two scaling factors.
In step S2, the stator dynamic voltage command value obtained is:
Figure BDA0003066578500000052
subjecting it to an equal deformation to obtain:
Figure BDA0003066578500000053
in the formula, #s(t) and psis(t-delta t) is an instantaneous flux linkage amplitude which respectively corresponds to the stator flux linkage amplitude at the front moment and the rear moment of the small time window delta t;
Figure BDA0003066578500000054
indicating a dynamic voltage command value that changes continuously; u shaperef1pu represents a reference value of rated voltage at a power grid connected with the wind driven generator; omega1Is the synchronous angular velocity.
When the system is in normal steady state operation, the stator voltage U of the doubly-fed asynchronous wind generators(t) will be equal to 1pu, i.e. the rated voltage UrefAnd considering that the relation U is satisfied between the stator voltage amplitude and the stator flux linkage amplitude at the moments(t)＝ω1·ψs(t), so the right side of equation (2) should be 0 under normal operating conditions, at which time equation (2) will evolve as:
Figure BDA0003066578500000061
as can be seen from the above formula, the voltage command value at this moment can be calculated from the flux linkage information before Δ t; this is because when the system is in normal stable operation, the inside of the generator is a circular rotating magnetic field, and the amplitude of the resultant stator flux linkage vector does not exceed the amplitude of the stator flux linkage vectorNow with large fluctuations, the flux linkage amplitude at each moment will remain approximately equal, i.e.. psis(t-Δt)≈ψs(t)。
In step S2, the equivalent processing process performed on the reactive component command value generation module is as shown in fig. 3, and after the equivalent processing, the voltage command value under the normal operation condition as shown in fig. 4 is obtained
Figure BDA0003066578500000062
And current command value
Figure BDA0003066578500000063
The equivalent series model of (1).
In step S3, a proportionality coefficient K is obtained from an equivalent model of the voltage command value and the reactive current command value1And K2The general form of the participating Equivalent series model, as shown in FIG. 5, is followed by a comparison of the two Equivalent series structures of FIG. 4 and FIG. 5 to obtain the proportionality coefficient K1And K2The equation relationship satisfied is as follows:
Figure BDA0003066578500000064
in the formula, LmIs the equivalent mutual inductance in the dq rotation coordinate system.
In the present embodiment, the proportionality coefficient K1、K2Is only selected in relation to the motor parameter LmIn this regard, such a high-low voltage ride-through control strategy based on dynamic voltage command value changes would be easy to implement.
In this embodiment, a wind power generation system simulation model is built based on an MATLAB/Simulink simulation platform, and the correctness of the proposed proportionality coefficient selection method is verified through two sets of simulations. Using simulation model parameters omega11pu and Lm2.9pu, formula (4) can be calculated to obtain the relation that the theoretical proportionality coefficient value should satisfy: k1·K2≈0.344；
FIGS. 6(a) -6(d) show the symmetric sudden increase to 1.3 times of high voltage at 25kV of the grid voltage, in selected proportionsCoefficient K10.06 and K2When the voltage is 5.5, the voltage amplitude of the machine end, the output reactive power of the wind driven generator, the amplitude of the stator flux linkage and the simulation result of the electromagnetic torque are correspondingly calculated to obtain K1·K2＝0.33；
FIGS. 7(a) -7(d) show the symmetric drop to 0.7 times of low voltage at 25kV of the grid voltage, and the selection of the proportionality coefficient K10.13 and K2When the voltage is 2.6, the voltage amplitude of the machine end, the output reactive power of the wind driven generator, the amplitude of the stator flux linkage and the simulation result of the electromagnetic torque are correspondingly calculated to obtain K1·K2＝0.338。
It can be seen that the actually selected proportionality coefficient K1And K2The product of the two is close to the theoretical value 0.344 calculated by using the model parameters, which shows that the formula (4) provided by the embodiment is correct and feasible as the selection basis of the proportionality coefficient in the high-low voltage ride through control based on the change of the dynamic voltage instruction value, and can correct K in time under different fault conditions1、K2The proportion of the wind power system control system ensures better control performance, and is beneficial to the realization of fault ride-through operation of the wind power system.
Example 2
The present embodiment provides a high-low voltage ride through control system based on a dynamic voltage command value, including:
the proportional coefficient introducing module is configured to obtain a generation model of a reactive component instruction value for the obtained stator dynamic voltage instruction value based on a proportional coefficient;
the equivalent model building module is configured to perform constant deformation on the dynamic voltage instruction value of the stator and perform equivalent processing on the generation model of the reactive component instruction value to obtain an equivalent model of the voltage instruction value and the reactive current instruction value under the normal operating condition;
the value range determining module is configured to obtain a value range of the proportionality coefficient according to the equivalent model of the voltage instruction value and the reactive current instruction value;
and the ride-through control module is configured to control high and low voltage ride-through according to the value of the proportionality coefficient.
It should be noted that the modules correspond to the steps described in embodiment 1, and the modules are the same as the corresponding steps in the implementation examples and application scenarios, but are not limited to the disclosure in embodiment 1. It should be noted that the modules described above as part of a system may be implemented in a computer system such as a set of computer-executable instructions.
In further embodiments, there is also provided:
an electronic device comprising a memory and a processor and computer instructions stored on the memory and executed on the processor, the computer instructions when executed by the processor performing the method of embodiment 1. For brevity, no further description is provided herein.
It should be understood that in this embodiment, the processor may be a central processing unit CPU, and the processor may also be other general purpose processors, digital signal processors DSP, application specific integrated circuits ASIC, off-the-shelf programmable gate arrays FPGA or other programmable logic devices, discrete gate or transistor logic devices, discrete hardware components, and so on. A general purpose processor may be a microprocessor or the processor may be any conventional processor or the like.
The memory may include both read-only memory and random access memory, and may provide instructions and data to the processor, and a portion of the memory may also include non-volatile random access memory. For example, the memory may also store device type information.
A computer readable storage medium storing computer instructions which, when executed by a processor, perform the method described in embodiment 1.
The method in embodiment 1 may be directly implemented by a hardware processor, or implemented by a combination of hardware and software modules in the processor. The software modules may be located in ram, flash, rom, prom, or eprom, registers, among other storage media as is well known in the art. The storage medium is located in a memory, and a processor reads information in the memory and completes the steps of the method in combination with hardware of the processor. To avoid repetition, it is not described in detail here.
Those of ordinary skill in the art will appreciate that the various illustrative elements, i.e., algorithm steps, described in connection with the embodiments disclosed herein may be implemented as electronic hardware or combinations of computer software and electronic hardware. Whether such functionality is implemented as hardware or software depends upon the particular application and design constraints imposed on the implementation. Skilled artisans may implement the described functionality in varying ways for each particular application, but such implementation decisions should not be interpreted as causing a departure from the scope of the present application.
The above is only a preferred embodiment of the present invention, and is not intended to limit the present invention, and various modifications and changes will occur to those skilled in the art. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Although the embodiments of the present invention have been described with reference to the accompanying drawings, it is not intended to limit the scope of the present invention, and it should be understood by those skilled in the art that various modifications and variations can be made without inventive efforts by those skilled in the art based on the technical solution of the present invention.

Claims (10)

1. A high-low voltage ride through control method based on a dynamic voltage command value is characterized by comprising the following steps:
obtaining a generation model of a reactive component instruction value for the obtained stator dynamic voltage instruction value based on a proportionality coefficient;
carrying out constant deformation on the dynamic voltage instruction value of the stator, and carrying out equivalent treatment on the generation model of the reactive component instruction value to obtain an equivalent model of the voltage instruction value and the reactive current instruction value under the normal operation working condition;
obtaining a value range of the proportionality coefficient according to the equivalent model of the voltage instruction value and the reactive current instruction value;
and controlling the high-low voltage ride through according to the value of the proportionality coefficient.
2. The method for controlling high and low voltage ride through based on dynamic voltage command values according to claim 1, wherein the performing identity transformation on the stator dynamic voltage command values comprises:
Figure FDA0003066578490000011
wherein psis(t) and psis(t- Δ t) is the instantaneous flux linkage amplitude;
Figure FDA0003066578490000012
a stator dynamic voltage command value; u shaperefA reference value of rated voltage at a power grid connected with the wind driven generator; omega1Is the synchronous angular velocity.
3. The dynamic voltage command value-based high-low voltage ride through control method as claimed in claim 2, wherein the stator voltage U is set to be equal to or lower than the stator voltage U under normal operation conditions(t) is equal to the rated voltage UrefAnd the stator voltage amplitude and the stator flux linkage amplitude satisfy the relation Us(t)＝ω1·ψs(t) so that the stator dynamic voltage command value is transformed into
Figure FDA0003066578490000013
4. The dynamic voltage command value-based high-low voltage ride through control method according to claim 1, wherein a general form of the equivalent model when the scaling factor is introduced is obtained according to the equivalent model of the voltage command value and the reactive current command value.
5. The dynamic voltage command value-based high-low voltage ride through control method according to claim 4, wherein the value range of the proportionality coefficient is obtained according to an equivalent model and a general form of the equivalent model.
6. The dynamic voltage command value-based high-low voltage ride through control method according to claim 1, wherein the scaling factor is two.
7. The dynamic voltage command value-based high-low voltage ride through control method according to claim 6, wherein the proportionality coefficient K1And K2The following equation relationship is satisfied:
Figure FDA0003066578490000021
wherein L ismIs equivalent mutual inductance, omega, in dq rotation coordinate system1Is the synchronous angular velocity.
8. A high-low voltage ride through control system based on dynamic voltage command values, comprising:
the proportional coefficient introducing module is configured to obtain a generation model of a reactive component instruction value for the obtained stator dynamic voltage instruction value based on a proportional coefficient;
the equivalent model building module is configured to perform constant deformation on the dynamic voltage instruction value of the stator and perform equivalent processing on the generation model of the reactive component instruction value to obtain an equivalent model of the voltage instruction value and the reactive current instruction value under the normal operating condition;
the value range determining module is configured to obtain a value range of the proportionality coefficient according to the equivalent model of the voltage instruction value and the reactive current instruction value;
and the ride-through control module is configured to control high and low voltage ride-through according to the value of the proportionality coefficient.
9. An electronic device comprising a memory and a processor and computer instructions stored on the memory and executed on the processor, the computer instructions when executed by the processor performing the method of any of claims 1-7.
10. A computer-readable storage medium storing computer instructions which, when executed by a processor, perform the method of any one of claims 1 to 7.
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