CN112928781B - Double-fed fan transient stability control method and system, computer equipment and medium - Google Patents

Double-fed fan transient stability control method and system, computer equipment and medium Download PDF

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CN112928781B
CN112928781B CN202110309975.2A CN202110309975A CN112928781B CN 112928781 B CN112928781 B CN 112928781B CN 202110309975 A CN202110309975 A CN 202110309975A CN 112928781 B CN112928781 B CN 112928781B
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value
fan
grid
phase
connected point
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CN112928781A (en
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唐王倩云
周保荣
洪潮
刘宇明
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China South Power Grid International Co ltd
China Southern Power Grid Co Ltd
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China South Power Grid International Co ltd
China Southern Power Grid Co Ltd
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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
    • H02J3/50—Controlling the sharing of the out-of-phase component
    • 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
    • H02J3/24—Arrangements for preventing or reducing oscillations of power in networks
    • H02J3/241—The oscillation concerning frequency
    • 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
    • H02J3/40—Synchronising a generator for connection to a network or to another generator
    • 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
    • H02J3/48—Controlling the sharing of the in-phase component
    • 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
    • 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
    • H02P9/00—Arrangements for controlling electric generators for the purpose of obtaining a desired output
    • H02P9/007—Control circuits for doubly fed generators
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02P—CONTROL OR REGULATION OF ELECTRIC MOTORS, ELECTRIC GENERATORS OR DYNAMO-ELECTRIC CONVERTERS; CONTROLLING TRANSFORMERS, REACTORS OR CHOKE COILS
    • H02P2101/00—Special adaptation of control arrangements for generators
    • H02P2101/15—Special adaptation of control arrangements for generators for wind-driven turbines
    • 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 provides a method, a system, computer equipment and a storage medium for controlling transient stability of a doubly-fed fan, wherein the method comprises the steps of obtaining a voltage amplitude value and a phase value of a preset measuring point, an idle value and a phase value of a fan grid-connected point, an impedance value between the preset measuring point and the fan grid-connected point and a current instruction value of a fan rotor side converter, obtaining an equivalent potential phase boundary judgment value according to a d-axis current instruction value of the fan rotor side converter, an impedance value between the preset measuring point and the fan grid-connected point, and the voltage amplitude value and the phase value of the preset measuring point, obtaining an actual equivalent potential phase value according to the d-axis current instruction value and the q-axis current instruction value of the fan rotor side converter and the phase value of the fan grid-connected point, and judging whether instability risk exists according to the actual equivalent potential phase value and the equivalent potential phase boundary judgment value, and carrying out transient stability control when instability exists. The invention effectively solves the problem of transient stability control of the power angle of the wind turbine generator, thereby ensuring the safe and stable operation of the power system.

Description

Double-fed fan transient stability control method and system, computer equipment and medium
Technical Field
The invention relates to the technical field of power systems, in particular to a double-fed fan transient stability control method, a double-fed fan transient stability control system, computer equipment and a storage medium.
Background
With the goals of carbon peak reaching and carbon neutralization, the utilization mode of wind power generation as a new energy source of the most scaled wind power generation part is rapidly developed, and a wind power generation unit gradually becomes a main power source in a power system. Although the physical and control structures of the wind turbine generator and the synchronous generator are different, the power system dominated by the wind turbine generator under transient disturbance also has a transient stability problem, and the stability problem is more complex compared with the power system dominated by the synchronous generator. In order to ensure that the wind turbine generator maintains non-off-grid operation in the transient process and provide certain support for a power system, a new requirement is necessarily provided for transient stability control of the wind turbine generator.
The existing wind power generation set transient stability control optimization is generally developed from the following three aspects: firstly, based on the hardware bearing capacity of the fan, the physical energy storage state (such as alternating current/direct current voltage/mechanical rotating speed) of the fan is not more than the hardware bearing capacity through software or hardware switching control, such as a crowbar, a direct current unloading loop, emergency variable pitch, current limiting and other control strategies; secondly, on the premise of ensuring that the system is not overloaded, the frequency or voltage of the system is supported by providing extra active or reactive power regulation capacity for the system, such as inertia control or reactive current injection control; and thirdly, optimizing the transient stability control of the wind turbine generator in the aspect of improving the power angle stability of the synchronizer. The transient stability control technology of the three types of wind turbine generators mainly focuses on the stress of the wind turbine generators, the support of the reactive voltage and the active power of a system and the promotion of the transient stability of a synchronous machine, and the problem of the power angle stability of the wind turbine generators in a power system is not considered. However, research shows that a phase-locked link of a wind turbine generator based on phase-locked synchronous control has no stable working point due to the fact that an internal potential phase of the wind turbine generator crosses a stable boundary, and then the wind turbine generator loses stability and even is off-grid.
Therefore, it is urgently needed to provide a control method for effectively solving the problem of transient stability of the power angle of the wind turbine generator in the power system, and further ensuring safe and stable operation of the power system.
Disclosure of Invention
The invention aims to provide a method for effectively solving the problem of transient stability of a power angle of a wind turbine generator in an electric power system from a power system stability mechanism dominated by a double-fed fan, so as to ensure safe and stable operation of the electric power system.
In order to achieve the above object, it is necessary to provide a doubly-fed wind turbine transient stability control method, a doubly-fed wind turbine transient stability control system, a computer device and a storage medium.
In a first aspect, an embodiment of the present invention provides a method for controlling transient stability of a doubly-fed wind turbine, where the method includes the following steps:
acquiring a voltage amplitude value and a phase value of a preset measuring point, an idle value and a phase value of a fan grid-connected point, an impedance value between the preset measuring point and the fan grid-connected point and a current instruction value of a fan rotor side converter; the current instruction value of the fan rotor side converter comprises a d-axis current instruction value and a q-axis current instruction value of the fan rotor side converter;
obtaining an equivalent potential phase boundary judgment value according to a d-axis current instruction value of the fan rotor side converter, an impedance value between the preset measurement point and a fan grid-connected point, and a voltage amplitude value and a phase value of the preset measurement point;
obtaining an actual equivalent potential phase value according to a d-axis current instruction value and a q-axis current instruction value of the fan rotor side converter and a phase value of the fan grid-connected point;
judging whether instability risks exist or not according to the equivalent potential phase boundary judgment value and the actual equivalent potential phase value;
and when the instability risk exists, performing transient stability control.
Further, the step of acquiring a voltage amplitude value and a phase value of a preset measurement point, an idle value and a phase value of a fan grid-connected point, an impedance value between the preset measurement point and the fan grid-connected point, and a current instruction value of a fan rotor side converter includes:
measuring to obtain a voltage amplitude value and a phase value of the preset measuring point, a reactive value and a phase value of the fan grid-connected point and an impedance value between the preset measuring point and the fan grid-connected point;
obtaining a d-axis current instruction value of the fan rotor side converter according to active branch control;
and obtaining a q-axis current instruction value of the fan rotor side converter according to the fan grid-connected point voltage control.
Further, the step of obtaining an equivalent potential phase boundary judgment value according to the d-axis current instruction value of the fan rotor side converter, the impedance value between the preset measurement point and the fan grid-connected point, and the voltage amplitude value and the phase value of the preset measurement point includes:
establishing a model of the equivalent potential phase boundary judgment value by combining fan body parameters according to a d-axis current instruction value of the fan rotor side converter, an impedance value between the preset measurement point and a fan grid-connected point, and a voltage amplitude value and a phase value of the preset measurement point:
Figure BDA0002988422140000031
wherein, A represents a preset measuring point, B is a fan grid-connected point, deltalimIs an equivalent potential phase boundary judgment value, K is a preset reliability coefficient, XsFor fan stator inductance, XmFor mutual inductive reactance of fan, XABIn order to preset the impedance value between the measuring point and the fan grid-connected point,
Figure BDA0002988422140000032
d-axis current command value, V, for a fan rotor side converterAFor presetting the voltage amplitude, delta, of the measuring pointAThe phase value of the measurement point is preset.
Further, the step of determining whether there is a risk of instability according to the equivalent potential phase boundary determination value and the actual equivalent potential phase value includes:
obtaining a corresponding phase ratio according to the actual equivalent potential phase value and the equivalent potential phase boundary judgment value;
and judging whether instability risks exist or not and generating a switching instruction value according to whether the phase ratio is in an allowed phase ratio interval or not, and judging that the instability risks exist when the phase ratio exceeds the allowed phase ratio interval.
Further, when there is a risk of instability, the step of performing transient stability control includes:
obtaining a voltage instruction value of an additional fan grid-connected point according to the switching instruction value;
and acquiring a basic value of the voltage instruction of the fan grid-connected point, and summing the basic value of the voltage instruction of the fan grid-connected point and the voltage instruction value of the additional fan grid-connected point to obtain an actual output voltage instruction value of the fan grid-connected point.
Further, the step of obtaining the voltage instruction value of the additional fan grid-connected point according to the switching instruction value includes:
when the switching instruction value is 1, the voltage instruction value of the additional fan grid-connected point is configured to be 0;
and when the switching instruction value is 2, obtaining the voltage instruction value of the additional fan grid-connected point through additional reactive power control.
Further, the step of obtaining the voltage command value of the grid-connected point of the additional fan through additional reactive power control includes:
acquiring a reactive power control instruction value and an additional reactive power control instruction value;
obtaining a reactive power control instruction value of the fan grid-connected point according to the reactive power control instruction value, the additional reactive power control instruction value and the reactive power value of the fan grid-connected point;
generating a voltage instruction value of the additional fan grid-connected point by adopting a reactive controller according to the reactive control instruction value of the fan grid-connected point; the reactive controller comprises a proportional controller, a proportional-integral controller and a proportional-integral-derivative controller.
In a second aspect, an embodiment of the present invention provides a doubly-fed wind turbine transient stability control system, where the system includes:
the first processing module is used for acquiring a voltage amplitude value and a phase value of a preset measuring point, an idle value and a phase value of a fan grid-connected point, an impedance value between the preset measuring point and the fan grid-connected point and a current instruction value of a fan rotor side converter; the current instruction value of the fan rotor side converter comprises a d-axis current instruction value and a q-axis current instruction value of the fan rotor side converter;
the second processing module is used for obtaining an equivalent potential phase boundary judgment value according to a d-axis current instruction value of the fan rotor side converter, an impedance value between the preset measurement point and a fan grid-connected point, and a voltage amplitude value and a phase value of the preset measurement point;
the third processing module is used for obtaining an actual equivalent potential phase value according to a d-axis current instruction value and a q-axis current instruction value of the fan rotor side converter and a phase value of the fan grid-connected point;
the instability judgment module is used for judging whether instability risks exist according to the equivalent potential phase boundary judgment value and the actual equivalent potential phase value;
and the stability control module is used for performing transient stability control when the instability risk exists.
In a third aspect, an embodiment of the present invention further provides a computer device, which includes a memory, a processor, and a computer program stored in the memory and executable on the processor, where the processor implements the steps of the method when executing the computer program.
In a fourth aspect, the present invention further provides a computer-readable storage medium, on which a computer program is stored, where the computer program is executed by a processor to implement the steps of the above method.
The application provides a doubly-fed fan transient stability control method, a doubly-fed fan transient stability control system, computer equipment and a storage medium, and by the method, after acquiring a voltage amplitude value and a phase value of a preset measurement point, an reactive value and a phase value of a fan grid-connected point, an impedance value between the preset measurement point and the fan grid-connected point, and a d-axis current instruction value and a q-axis current instruction value of a fan rotor side converter, respectively acquiring an equivalent potential phase boundary judgment value and an actual equivalent potential phase value based on a transient stability mechanism of a power system dominated by a wind turbine generator, judging whether a instability risk exists or not by combining a hysteresis comparator according to a ratio of the actual equivalent potential phase value and the equivalent potential phase boundary judgment value, and enabling additional reactive power control to dynamically adjust an additional fan grid-connected point voltage instruction value when the instability risk exists, and performing transient stability control. Compared with the prior art, the method effectively solves the control problem of transient stability of the power angle of the wind turbine generator in the power system dominated by the wind turbine generator, and further ensures safe and stable operation of the power system.
Drawings
Fig. 1 is a schematic view of an application scenario of a double-fed fan transient stability control method in an embodiment of the present invention;
FIG. 2 is a schematic diagram of an application of the transient stability control method of the doubly-fed wind turbine in the embodiment of the present invention;
FIG. 3 is a schematic flow chart of a transient stability control method for a doubly-fed wind turbine in an embodiment of the present invention;
fig. 4 is a schematic diagram of active branch control in the method for controlling transient stability of the doubly-fed wind turbine in the embodiment of the present invention;
FIG. 5 is a schematic flow chart illustrating the step S14 in FIG. 3 for determining whether there is a risk of instability;
fig. 6 is a schematic diagram of a method for generating a switching instruction value by the hysteresis comparator based on the equivalent potential phase boundary determination value and the actual equivalent potential phase value in step S142 in fig. 5;
fig. 7 is a schematic flow chart of the transient stability control performed at S15 in fig. 5;
fig. 8 is a schematic flow chart illustrating that in step S151 in fig. 7, an additional fan grid-connected point voltage command value is obtained according to a switching command value;
fig. 9 is a schematic flowchart of the step S1512 in fig. 8, where the additional reactive power control is performed to obtain a voltage command value of an additional fan grid-connected point;
FIG. 10 is a schematic diagram of an application effect of the transient stability control method for the doubly-fed wind turbine in the embodiment of the present invention;
fig. 11 is a schematic structural diagram of a doubly-fed wind turbine transient stability control system in the embodiment of the present invention.
Detailed Description
In order to make the purpose, technical solution and advantages of the present invention more clearly apparent, the present invention is further described in detail below with reference to the accompanying drawings and embodiments, and it is obvious that the embodiments described below are part of the embodiments of the present invention, and are used for illustrating the present invention only, but not for limiting the scope of the present invention. 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.
The method, the system, the computer equipment and the storage medium for controlling the transient stability of the doubly-fed wind turbine provided by the invention can be applied to a typical scene of a doubly-fed wind turbine leading single-machine infinite grid-connected system which is composed of the doubly-fed wind turbine, an infinite power grid, a transmission line and a transformer, as shown in figure 1. The wind power is transmitted to a remote infinite power grid (6 bus) through a connecting line (the connecting line between No. 1 and No. 6 buses), the connecting line between No. 3 and No. 4 buses is a double-circuit line, a fault position is located on one connecting line between No. 3 and No. 4 buses, and the fault is a three-phase short-circuit fault and is removed in a fault line isolation mode. The fan grid connection point B is located on the No. 1 bus, and the preset measurement point A is located on the No. 3 bus. As shown in fig. 2, in the present application, a d-axis current instruction value of a wind turbine rotor side converter is output through active branch control, a fan grid-connected point voltage instruction basic value is output through reactive power control, and an additional fan grid-connected point voltage instruction value is output through additional reactive power control (transient optimization control), and an actual output voltage instruction value of a fan grid-connected point is obtained according to the fan grid-connected point voltage instruction basic value and the additional reactive fan grid-connected point voltage instruction value, and the doubly-fed wind turbine transient stability control method that outputs a q-axis current instruction value of the wind turbine rotor side converter through fan grid-connected point voltage control realizes power angle transient stability control of a wind turbine generator. The embodiments of the present application all use the scenario shown in fig. 1 to verify and explain the supporting effect of the transient stability control provided by the present invention on the transient power angle stability of the wind power dominant power system.
In one embodiment, as shown in fig. 3, a doubly-fed wind turbine transient stability control method is provided, which includes the following steps:
s11, acquiring a voltage amplitude value and a phase value of a preset measuring point, an idle value and a phase value of a fan grid-connected point, an impedance value between the preset measuring point and the fan grid-connected point and a current instruction value of a fan rotor side converter; the current instruction value of the fan rotor side converter comprises a d-axis current instruction value and a q-axis current instruction value of the fan rotor side converter;
the preset measurement point a shown in fig. 1 may be any node in an actual power grid, and may be specifically selected according to actual application requirements. After the preset test point and the fan grid-connected point are determined, the voltage amplitude V of the preset test point can be obtained by adopting the prior artASum phase value deltaAReactive value Q of fan grid-connected pointBSum phase value deltaBPresetting an impedance value X between the measuring point and a fan grid-connected pointABAnd d-axis current command value of fan rotor-side converter
Figure BDA0002988422140000071
And q-axis current command value
Figure BDA0002988422140000072
In this example, the voltage amplitude V of the preset measuring point is given in conjunction with the application scenario shown in fig. 1AAnd a phase value deltaAReactive value Q of fan grid-connected pointBSum phase value deltaBPresetting an impedance value X between the measuring point and a fan grid-connected pointABThe d-axis current instruction value of the wind turbine rotor side converter is obtained by measurement
Figure BDA0002988422140000073
The q-axis current instruction value of the wind turbine rotor side converter can be obtained according to the active branch control shown in FIG. 4
Figure BDA0002988422140000074
The exemplary explanation can be made according to the technical scheme obtained by the fan grid-connected point voltage control as shown in fig. 2.
The implementation of the active branch shown in fig. 4 includes inertia control, maximum power tracking, rotation speed control and torque control. Wherein, the output of the inertia control is an inertia control power instruction; the output of the maximum power tracking control is a rotor rotating speed instruction; the input of the rotating speed control is a rotor rotating speed instruction, and the output of the rotating speed control is a rotating speed control power instruction; the input of the torque control is the sum of an inertia control power instruction and a rotating speed control power instruction, and the output of the torque control is a d-axis current instruction value of a fan rotor side converter. It should be noted that the implementation manner of the active branch control shown in fig. 4 is only an example, and the d-axis current command value of the wind turbine rotor-side converter may also be generated by other manners such as transient control.
S12, obtaining an equivalent potential phase boundary judgment value according to a d-axis current instruction value of the fan rotor side converter, an impedance value between the preset measurement point and a fan grid-connected point, and a voltage amplitude value and a phase value of the preset measurement point;
wherein the equivalent potential phase boundary judgment value deltalimWhether the calculation method is accurate and reasonable or not can directly influence the accuracy and effectiveness of judging whether the double-fed fan has transient instability or not, and is also a key basis for subsequently carrying out the transient stability control of the double-fed fan. The embodiment focuses on the problem of self transient stability of the double-fed fan, and provides a reasonable and effective calculation method for the equivalent potential phase boundary judgment value of the double-fed fan from the principle that self power angle stability of the double-fed fan is different from the stability mechanism of a main power system of a synchronous machine.
According to the obtained d-axis current instruction value of the fan rotor side converter
Figure BDA0002988422140000081
Presetting an impedance value X between a measuring point and a fan grid-connected pointABAnd the voltage amplitude V of the predetermined measurement pointASum phase value deltaAEstablishing an equivalent potential phase boundary judgment value delta by combining the fan body parameterslimThe model (2) is as follows:
Figure BDA0002988422140000082
wherein A represents a preset measuring point, B represents a fan grid-connected point, K represents a preset reliability coefficient, and X represents a preset measuring pointsFor fan stator inductance, XmFor mutual inductive reactance of fan, XABIn order to preset the impedance value between the measuring point and the fan grid-connected point,
Figure BDA0002988422140000083
d-axis current command value, V, for a fan rotor side converterAFor presetting the voltage amplitude, delta, of the measuring pointAThe phase value of the measurement point is preset.
Fan stator inductive reactance X in this examplesMutual inductance and reactance X of fanmThe parameters of the fan body are known values, and the specific selection method of the preset reliable coefficient K value can be given according to actual conditions or empirical values, which is not described herein again. And substituting the obtained related data of the preset measuring point, the fan grid-connected point and the fan rotor side converter into a calculation model of the double-fed fan equivalent potential phase boundary judgment value to obtain a reasonable and effective boundary judgment value, thereby providing a reliable basis for the subsequent abnormal detection of the actual equivalent potential phase value in the power grid.
S13, obtaining an actual equivalent potential phase value according to a d-axis current instruction value and a q-axis current instruction value of the fan rotor side converter and the phase value of the fan grid connection point;
wherein the actual equivalent potential phase value δeAccording to the obtained d-axis current command value of the fan rotor side converter
Figure BDA0002988422140000091
And q-axis current command value
Figure BDA0002988422140000092
And phase value delta of fan grid-connected point BBThe method is obtained by the following calculation formula:
Figure BDA0002988422140000093
wherein,
Figure BDA0002988422140000094
is a d-axis current command value of the fan rotor side converter,
Figure BDA0002988422140000095
for the q-axis current command value, delta, of the fan rotor side converterBAnd the phase value is the phase value of the fan grid-connected point.
S14, judging whether instability risks exist according to the equivalent potential phase boundary judgment value and the actual equivalent potential phase value;
the instability risk is a basis for judging whether the transient stability problem of the power angle exists in the wind turbine generator, and the instability judgment method is carried out based on the actual equivalent potential phase value and the equivalent potential phase boundary judgment value, and can be used for judging whether the difference value of the two values is within an allowable range or whether the ratio value of the two values is within the allowable range. In this embodiment, a ratio of an actual equivalent potential phase value to an equivalent potential phase boundary judgment value is used as a criterion for judging whether there is a risk of instability, and as shown in fig. 5, the step S14 of judging whether there is a risk of instability according to the equivalent potential phase boundary judgment value and the actual equivalent potential phase value includes:
s141, obtaining a corresponding phase ratio according to the actual equivalent potential phase value and the equivalent potential phase boundary judgment value;
the calculation formula of the phase ratio r of the actual equivalent potential phase value to the equivalent potential phase boundary judgment value can be expressed as follows:
Figure BDA0002988422140000096
wherein, deltaeAnd deltalimThe actual equivalent potential phase value and the equivalent potential phase boundary judgment value are respectively. The phase ratio obtained here can be directly input into the hysteresis comparator for subsequent use.
And S142, judging whether instability risks exist or not and generating a switching instruction value according to whether the phase ratio is in an allowed phase ratio interval or not, and judging that the instability risks exist when the phase ratio exceeds the allowed phase ratio interval.
The switching instruction value is obtained according to the hysteresis comparators with the preset number of sections, the specific number of the sections of the hysteresis comparators used by the switching instruction value can be set according to actual requirements, and if 3 sections of the hysteresis comparators are divided and judged according to the phase ratio, the corresponding three sections of the hysteresis comparators can be set. The use of a two-stage hysteresis comparator is merely exemplary in this embodiment.
After obtaining the phase ratio, the phase ratio is input to a two-stage hysteresis comparator, and as shown in fig. 6, a switching command K is generated by the following methodjudge：
Figure BDA0002988422140000101
Wherein, Klow、KtopThe specific setting method of the corresponding value can be selected according to the use requirements or experience, wherein the specific setting method is respectively a preset lower limit and a preset upper limit of the phase ratio, namely an upper limit and a lower limit of an allowable phase ratio interval. It should be noted that, in this embodiment, a preset threshold width K is adopteddbAnd respectively giving preset values of a lower bound and an upper bound of the phase ratio according to the set threshold width and the following formula:
Figure BDA0002988422140000102
its threshold width KdbCan be selected according to the use requirements or experience, and K is the principledbThe smaller the hysteresis comparator, the higher the sensitivity, and the more sensitive the corresponding monitoring of the risk of instability.
Figure BDA0002988422140000103
For switching instruction values generated by previous hysteretic comparators, i.e.
Figure BDA0002988422140000104
Wherein
Figure BDA0002988422140000105
Indicating that the phase ratio is between the lower and upper phase ratio limits when the hysteretic comparator is executed the nth time, i.e. the switching command value, K, is within a stable rangejudge[n-1]For the switching instruction value generated by executing the hysteresis comparator for the (n-1) th time, when the hysteresis comparator is executed for the first time, the switching instruction value generated by the previous hysteresis comparator, which is required by the phase ratio between the lower bound and the upper bound of the phase ratio, can be set as a fixed constant according to the actual situation, for example, the switching instruction value generated by the previous hysteresis comparator can be set as the fixed constant by setting the switching instruction value generated by the previous hysteresis comparator, which is required by the phase ratio between the lower bound and the upper bound of the phase ratio, and the switching instruction value can be set as the fixed constant by setting the switching instruction value generated by the previous hysteresis comparator, which is required by the previous hysteresis comparator, according to the actual situation, for example, the switching instruction value generated by the previous hysteresis comparator can be set as the fixed constant by setting the switching instruction value between the lower bound and the upper bound of the phase ratio, which is executed for the (n-1) th time
Figure BDA0002988422140000106
Generating a switching command K from the abovejudgeThe hysteresis comparator model of (2) is set as follows: when the phase ratio of the actual equivalent potential phase value to the equivalent potential phase boundary judgment value is smaller than the lower phase ratio limit, generating a switching instruction Kjudge1 is ═ 1; when the phase ratio of the actual equivalent potential phase value to the equivalent potential phase boundary judgment value is larger than the phase ratio upper bound, generating a switching instruction K judge2; when the phase ratio of the actual equivalent potential phase value to the equivalent potential phase boundary judgment value is within the allowable phase ratio interval, the generated switching instruction is set as the switching instruction value generated by the previous hysteresis comparator, namely
Figure BDA0002988422140000111
Meanwhile, when the hysteresis comparator generates a switching instruction of1 or 2, only indicating that the wind turbine has instability risk and needing to take corresponding different stability control measures. Certainly, the switching instruction 1 or 2 generated when the phase ratio of the actual equivalent potential phase value to the equivalent potential phase boundary judgment value is smaller than the lower limit of the phase ratio, or larger than the lower limit of the phase ratio is only an exemplary example for explaining the technical scheme, and in practical application, other values can be set according to requirements, and then the corresponding implementation conditions of the tentative stability control are modified, so that the control method can be used for performing the transient stability control on the doubly-fed fan, and the corresponding technical effect is achieved.
In this embodiment, based on the obtained equivalent potential phase boundary judgment value, a hysteresis comparator with a preset number of segments is used to judge whether the doubly-fed wind turbine has a risk of instability, and a corresponding switching instruction value is generated at the same time, so that the method for regulating and controlling the risk of subsequent instability is ensured, the method conforms to the stabilization mechanism of a power system dominated by a wind turbine generator, and is simple and scientific, and the method for judging the instability is reasonable and effective.
And S15, when the instability risk exists, performing transient stability control.
As shown in fig. 7, the step S15 of performing the transient stability control when the instability risk exists includes:
s151, obtaining a voltage instruction value of an additional fan grid-connected point according to the switching instruction value;
the switching instruction value is generated by the hysteresis comparator, and when the corresponding switching instruction value is 1 or 2 described above, transient stability control needs to be performed. As shown in fig. 8, the step S151 of obtaining the voltage command value of the grid-connected point of the additional fan according to the switching command value includes:
s1511, when the switching instruction value is 1, configuring the voltage instruction value of the additional fan grid-connected point to be 0;
when the switching instruction value is 1, that is, the phase ratio of the actual equivalent potential phase value to the equivalent potential phase boundary judgment value is smaller than the lower limit of the phase ratio, additional voltage adjustment is not performed on the fan grid-connected point temporarily. Of course, the voltage command value of the additional fan grid-connected point can be configured as 0, and can also be configured as a reasonable value according to the actual situation, and the implementation effect is not affected in principle.
And S1512, when the switching instruction value is 2, obtaining the voltage instruction value of the additional fan grid-connected point through additional reactive power control.
When the switching instruction value is 2, namely the phase ratio of the actual equivalent potential phase value to the equivalent potential phase boundary judgment value is greater than the phase ratio upper bound, the voltage instruction value of the grid-connected point of the additional fan can be obtained by adding a reactive power control path and adopting the existing reactive power control method
Figure BDA0002988422140000121
And is used for the basic voltage of the wind turbine grid connection
Figure BDA0002988422140000122
And (6) adjusting. Specifically, as shown in fig. 9, the step S1512 of obtaining the voltage command value of the additional fan grid-connected point through additional reactive power control includes:
s15121, obtaining a reactive power control instruction value and an additional reactive power control instruction value;
wherein the reactive power control instruction value
Figure BDA0002988422140000123
And additional reactive control commands
Figure BDA0002988422140000124
Which are respectively obtained by the reactive power control branch and the additional reactive power control branch (transient optimization control branch) as shown in fig. 2, and are not described herein again.
S15122, obtaining a reactive power control instruction value of the wind turbine grid-connected point according to the reactive power control instruction value, the additional reactive power control instruction value and the reactive power value of the wind turbine grid-connected point;
wherein, according to the obtained reactive power control instruction value
Figure BDA0002988422140000125
Adding reactive control instruction values
Figure BDA0002988422140000126
Reactive value Q of grid-connected point of wind turbineBThe expression of the reactive power control instruction value of the wind turbine grid-connected point is obtained as
Figure BDA0002988422140000127
S15123, generating a voltage instruction value of the additional fan grid-connected point by adopting a reactive power controller according to the reactive power control instruction value of the fan grid-connected point; the reactive controller comprises a proportional controller, a proportional-integral controller and a proportional-integral-derivative controller.
Wherein, the voltage instruction value of the additional fan grid-connected point is the reactive power control instruction value of the fan grid-connected point obtained by the reactive power controller based on the above
Figure BDA0002988422140000131
The result generated, in particular, is related to the type of reactive controller selected in particular. In principle, the reactive power controller in this embodiment may be any one of a proportional controller, a proportional-integral-derivative controller, or the like that can generate the voltage command value of the grid-connected point of the additional fan. The method for generating the three reactive power controllers is as follows:
(1) the additional reactive power control adopts a proportional controller, and a formula for generating a voltage instruction value of an additional fan grid-connected point is as follows:
Figure BDA0002988422140000132
wherein,
Figure BDA0002988422140000133
is a parameter of the proportional controller and,
Figure BDA0002988422140000134
a reactive power control instruction value of a fan grid-connected point;
(2) the additional reactive power control adopts a proportional-integral controller, and a formula for generating a voltage instruction value of an additional fan grid-connected point is as follows:
Figure BDA0002988422140000135
Figure BDA0002988422140000136
is a parameter of the proportional controller and,
Figure BDA0002988422140000137
is a parameter of the integral controller and is,
Figure BDA0002988422140000138
a reactive power control instruction value of a fan grid-connected point;
(3) the additional reactive power control adopts a proportional integral derivative controller, and a formula for generating a voltage instruction value of an additional fan grid-connected point is as follows:
Figure BDA0002988422140000139
Figure BDA00029884221400001310
is a parameter of the proportional controller and,
Figure BDA00029884221400001311
is a parameter of the integral controller and is,
Figure BDA00029884221400001312
is a parameter of the differential controller and is,
Figure BDA00029884221400001313
and the control instruction value is a reactive power control instruction value of the fan grid-connected point.
It should be noted that the selection and use of the three reactive controllers can be determined according to actual conditions, and the parameters of the proportional controller
Figure BDA00029884221400001314
Parameters of integral controller
Figure BDA00029884221400001315
Parameters of a differential controller
Figure BDA0002988422140000141
May also be given based on actual or empirical values.
S152, obtaining a basic value of a fan grid-connected point voltage instruction, and summing the basic value of the fan grid-connected point voltage instruction and the additional fan grid-connected point voltage instruction value to obtain an actual output voltage instruction value of the fan grid-connected point.
Wherein, the voltage instruction basic value of the wind turbine grid-connected point
Figure BDA0002988422140000142
Given by the reactive power control shown in fig. 2. The method of the embodiment is adopted to obtain the voltage instruction value of the grid-connected point of the additional fan
Figure BDA0002988422140000143
Then, the actual output voltage instruction value of the fan grid-connected point is easily obtained as
Figure BDA0002988422140000144
And further, the dynamic regulation and control of the voltage of the fan grid-connected point are realized.
In order to verify the application effect of the transient stability control method for the doubly-fed fan, the performance of the doubly-fed fan to which the transient stability control method provided by the invention is applied is compared and analyzed with the performance of the doubly-fed fan to which the transient stability control method provided by the invention is not applied in an actual power system in a transient process, as shown in fig. 10, the phase of the equivalent potential of the doubly-fed fan to which the transient stability control method provided by the invention is not applied is monotonically increased and loses stability, and conversely, the phase of the equivalent potential of the doubly-fed fan to which the transient stability control method provided by the invention is applied is not lost stability. It can be seen that, in this embodiment, the equivalent potential phase boundary determination value obtained in the above embodiment uses a hysteresis comparator with a preset number of segments to determine whether the doubly-fed wind turbine has a destabilization risk, and on the basis of generating the corresponding switching instruction value at the same time, the generation mode of the voltage instruction value of the grid-connected point of the additional wind turbine is dynamically adjusted through adding additional reactive power control, so as to adjust the equivalent potential phase to ensure the transient stability of the doubly-fed wind turbine, thereby effectively solving the problem of transient stability control of the power angle of the wind turbine, further avoiding the problem of phase destabilization of the power system due to the excessively large phase of the doubly-fed wind turbine, effectively improving the transient stability of the power system, and effectively ensuring the safe and stable operation of the power system.
It should be noted that, although the steps in the above-described flowcharts are shown in sequence as indicated by arrows, the steps are not necessarily executed in sequence as indicated by the arrows. The steps are not performed in the exact order shown and described, and may be performed in other orders, unless explicitly stated otherwise.
In one embodiment, as shown in fig. 11, there is provided a doubly fed wind turbine transient stability control system, the system includes:
the first processing module 1 is used for acquiring a voltage amplitude value and a phase value of a preset measuring point, an idle value and a phase value of a fan grid-connected point, an impedance value between the preset measuring point and the fan grid-connected point and a current instruction value of a fan rotor side converter; the current instruction value of the fan rotor side converter comprises a d-axis current instruction value and a q-axis current instruction value of the fan rotor side converter;
the second processing module 2 is configured to obtain an equivalent potential phase boundary judgment value according to a d-axis current instruction value of the fan rotor side converter, an impedance value between the preset measurement point and a fan grid-connected point, and a voltage amplitude value and a phase value of the preset measurement point;
the third processing module 3 is configured to obtain an actual equivalent potential phase value according to a d-axis current instruction value and a q-axis current instruction value of the fan rotor-side converter and a phase value of the fan grid-connected point;
the instability judgment module 4 is used for judging whether instability risks exist according to the equivalent potential phase boundary judgment value and the actual equivalent potential phase value;
and the stability control module 5 is used for performing transient stability control when the instability risk exists.
For specific limitations of the doubly-fed wind turbine transient stability control system, reference may be made to the above limitations on the doubly-fed wind turbine transient stability control method, and details are not repeated here. All modules in the double-fed fan transient stability control system can be completely or partially realized through software, hardware and a combination of the software and the hardware. The modules can be embedded in a hardware form or independent from a processor in the computer device, and can also be stored in a memory in the computer device in a software form, so that the processor can call and execute operations corresponding to the modules.
In one embodiment, a computer device is provided, comprising a memory, a processor and a computer program stored on the memory and executable on the processor, the steps of the above method being performed when the computer program is executed by the processor.
In an embodiment, a computer-readable storage medium is provided, on which a computer program is stored, which computer program, when being executed by a processor, carries out the steps of the above-mentioned method.
To sum up, the doubly-fed wind turbine transient stability control method, the doubly-fed wind turbine transient stability control system, the computer device and the storage medium provided by the embodiments of the present invention obtain a phase boundary determination value of an equivalent potential according to a d-axis current instruction value of a wind turbine rotor side converter, an impedance value between a preset measurement point and a wind turbine grid-connected point, and a voltage amplitude value and a phase value of the preset measurement point after obtaining a voltage amplitude value and a phase value of the preset measurement point, an reactive value and a q-axis current instruction value of the wind turbine rotor side converter, an impedance value between the preset measurement point and the wind turbine grid-connected point, and a phase ratio of the actual phase value of the equivalent potential to the phase boundary determination value to determine whether an unstable wind turbine transient stability exists within an allowable phase ratio interval The method comprises the steps of generating a switching instruction value through a hysteresis comparator, dynamically generating an additional fan grid-connected point voltage instruction value through a reactive controller according to the generated switching instruction value when instability risks exist, and performing transient stability control, wherein a reasonable and effective calculation model of an equivalent potential phase boundary judgment value of the double-fed fan is provided based on the principle that the self power angle stability of the double-fed fan is different from the stability mechanism of a main power system of a synchronous machine, whether the double-fed fan has the instability risk is judged through the hysteresis comparator with preset sections, the double-fed generation mode of the additional fan grid-connected point voltage instruction value is dynamically adjusted through adding additional reactive control, the equivalent potential phase is adjusted to ensure the self transient stability of the fan, the method is simple and scientific, the problem of transient stability control of the self power angle of a wind turbine generator set can be effectively solved, and the transient stability of the power system is effectively improved, and further ensure the safe and stable operation of the power system.
It will be understood by those skilled in the art that all or part of the processes of the methods of the embodiments described above can be implemented by hardware instructions of a computer program, which can be stored in a non-volatile computer-readable storage medium, and when executed, can include the processes of the embodiments of the methods described above.
The embodiments in this specification are described in a progressive manner, and all the same or similar parts of the embodiments are directly referred to each other, and each embodiment is described with emphasis on differences from other embodiments. In particular, for embodiments of the system, the computer device, and the storage medium, since they are substantially similar to the method embodiments, the description is relatively simple, and in relation to the description, reference may be made to some portions of the description of the method embodiments. It should be noted that, the technical features of the embodiments may be arbitrarily combined, and for the sake of brevity, all possible combinations of the technical features in the embodiments are not described, but should be considered as the scope of the present specification as long as there is no contradiction between the combinations of the technical features.
The above-mentioned embodiments only express some preferred embodiments of the present application, and the description thereof is more specific and detailed, but not construed as limiting the scope of the invention. It should be noted that, for those skilled in the art, various modifications and substitutions can be made without departing from the technical principle of the present invention, and these should be construed as the protection scope of the present application. Therefore, the protection scope of the present patent application shall be subject to the protection scope of the claims.

Claims (8)

1. A doubly-fed wind turbine transient stability control method is characterized by comprising the following steps:
acquiring a voltage amplitude value and a phase value of a preset measuring point, an idle value and a phase value of a fan grid-connected point, an impedance value between the preset measuring point and the fan grid-connected point and a current instruction value of a fan rotor side converter; the current instruction value of the fan rotor side converter comprises a d-axis current instruction value and a q-axis current instruction value of the fan rotor side converter;
obtaining an equivalent potential phase boundary judgment value according to a d-axis current instruction value of the fan rotor side converter, an impedance value between the preset measurement point and a fan grid-connected point, and a voltage amplitude value and a phase value of the preset measurement point;
obtaining an actual equivalent potential phase value according to a d-axis current instruction value and a q-axis current instruction value of the fan rotor side converter and a phase value of the fan grid-connected point;
judging whether instability risks exist or not according to the equivalent potential phase boundary judgment value and the actual equivalent potential phase value;
when the instability risk exists, performing transient stability control;
the step of obtaining an equivalent potential phase boundary judgment value according to a d-axis current instruction value of the fan rotor side converter, an impedance value between the preset measurement point and a fan grid-connected point, and a voltage amplitude value and a phase value of the preset measurement point includes:
establishing a model of the equivalent potential phase boundary judgment value by combining fan body parameters according to a d-axis current instruction value of the fan rotor side converter, an impedance value between the preset measurement point and a fan grid-connected point, and a voltage amplitude value and a phase value of the preset measurement point:
Figure FDA0003591966470000011
wherein, A represents a preset measuring point, B is a fan grid-connected point, deltalimIs an equivalent potential phase boundary judgment value, K is a preset reliability coefficient, XsFor fan stator inductance, XmFor mutual inductive reactance of fan, XABIn order to preset the impedance value between the measuring point and the fan grid-connected point,
Figure FDA0003591966470000012
d-axis current command value, V, for a fan rotor side converterAFor presetting the voltage amplitude, delta, of the measuring pointAA phase value of a preset measuring point;
the calculation formula of the actual equivalent potential phase value is as follows:
Figure FDA0003591966470000021
wherein,
Figure FDA0003591966470000022
is a d-axis current command value of the fan rotor side converter,
Figure FDA0003591966470000023
for the q-axis current command value, delta, of the fan rotor side converterBThe phase value of the fan grid-connected point is obtained;
the step of judging whether the instability risk exists according to the equivalent potential phase boundary judgment value and the actual equivalent potential phase value comprises the following steps:
obtaining a corresponding phase ratio according to the actual equivalent potential phase value and the equivalent potential phase boundary judgment value;
and judging whether instability risks exist or not and generating a switching instruction value according to whether the phase ratio is in an allowed phase ratio interval or not, and judging that the instability risks exist when the phase ratio exceeds the allowed phase ratio interval.
2. The doubly-fed wind turbine transient stability control method of claim 1, wherein the step of obtaining the voltage amplitude and phase values of the preset measurement points, the reactive values and phase values of the wind turbine grid-connected points, the impedance values between the preset measurement points and the wind turbine grid-connected points, and the current command values of the wind turbine rotor side converters comprises:
measuring to obtain a voltage amplitude value and a phase value of the preset measuring point, a reactive value and a phase value of the fan grid-connected point and an impedance value between the preset measuring point and the fan grid-connected point;
obtaining a d-axis current instruction value of the fan rotor side converter according to active branch control;
and obtaining a q-axis current instruction value of the fan rotor side converter according to the fan grid-connected point voltage control.
3. The doubly-fed wind turbine transient stability control method of claim 1, wherein the step of performing transient stability control when there is a risk of instability comprises:
obtaining a voltage instruction value of an additional fan grid-connected point according to the switching instruction value;
and acquiring a basic value of the voltage instruction of the fan grid-connected point, and summing the basic value of the voltage instruction of the fan grid-connected point and the voltage instruction value of the additional fan grid-connected point to obtain an actual output voltage instruction value of the fan grid-connected point.
4. The doubly-fed wind turbine transient stability control method of claim 3, wherein the step of obtaining the additional wind turbine grid-connected point voltage command value according to the switching command value comprises:
when the switching instruction value is 1, the voltage instruction value of the additional fan grid-connected point is configured to be 0;
and when the switching instruction value is 2, obtaining the voltage instruction value of the additional fan grid-connected point through additional reactive power control.
5. The doubly fed wind turbine transient stability control method of claim 4, wherein said step of obtaining said additional wind turbine grid-connected point voltage command value by additional reactive power control comprises:
acquiring a reactive power control instruction value and an additional reactive power control instruction value;
obtaining a reactive power control instruction value of the fan grid-connected point according to the reactive power control instruction value, the additional reactive power control instruction value and the reactive power value of the fan grid-connected point;
generating a voltage instruction value of the additional fan grid-connected point by adopting a reactive controller according to the reactive control instruction value of the fan grid-connected point; the reactive controller comprises a proportional controller, a proportional-integral controller and a proportional-integral-derivative controller.
6. A doubly-fed wind turbine transient stability control system, characterized in that the doubly-fed wind turbine transient stability control method according to any one of claims 1 to 5 can be executed, and the system comprises:
the first processing module is used for acquiring a voltage amplitude value and a phase value of a preset measuring point, an idle value and a phase value of a fan grid-connected point, an impedance value between the preset measuring point and the fan grid-connected point and a current instruction value of a fan rotor side converter; the current instruction value of the fan rotor side converter comprises a d-axis current instruction value and a q-axis current instruction value of the fan rotor side converter;
the second processing module is used for obtaining an equivalent potential phase boundary judgment value according to a d-axis current instruction value of the fan rotor side converter, an impedance value between the preset measurement point and a fan grid-connected point, and a voltage amplitude value and a phase value of the preset measurement point;
the third processing module is used for obtaining an actual equivalent potential phase value according to a d-axis current instruction value and a q-axis current instruction value of the fan rotor side converter and a phase value of the fan grid-connected point;
the instability judgment module is used for judging whether instability risks exist according to the equivalent potential phase boundary judgment value and the actual equivalent potential phase value;
and the stability control module is used for performing transient stability control when instability risks exist.
7. A computer 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 5 are implemented when the computer program is executed by the processor.
8. 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 one of claims 1 to 5.
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