CN111313434B - Resonance coefficient control method, subsynchronous suppression device and controller - Google Patents
Resonance coefficient control method, subsynchronous suppression device and controller Download PDFInfo
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- CN111313434B CN111313434B CN202010085480.1A CN202010085480A CN111313434B CN 111313434 B CN111313434 B CN 111313434B CN 202010085480 A CN202010085480 A CN 202010085480A CN 111313434 B CN111313434 B CN 111313434B
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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
- H02J3/24—Arrangements for preventing or reducing oscillations of power in networks
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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
- H02J3/01—Arrangements for reducing harmonics or ripples
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E10/00—Energy generation through renewable energy sources
- Y02E10/70—Wind energy
- Y02E10/76—Power conversion electric or electronic aspects
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E40/00—Technologies for an efficient electrical power generation, transmission or distribution
- Y02E40/40—Arrangements for reducing harmonics
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Abstract
The embodiment of the invention provides a self-adaptive resonance coefficient control method, a sub-synchronous suppression method, a device and a converter controller, wherein the method comprises the following steps: acquiring subsynchronous oscillation electric energy generated by subsynchronous oscillation of a power transmission system; obtaining quasi-resonance compensation parameters of the power transmission system according to the subsynchronous oscillation electric energy; and dynamically adjusting the resonance coefficient of the system according to the quasi-resonance compensation parameter. According to the method provided by the embodiment of the invention, the resonance coefficient of the system can be adaptively adjusted in real time according to the change of the system operation mode or parameters, and the subsynchronous oscillation frequency can be adjusted in real time and follows the change of the system, so that the subsynchronous oscillation suppressor can still better track the power grid frequency without dead time when the subsynchronous oscillation frequency changes, and better voltage waveform is output.
Description
Technical Field
The invention relates to the technical field of power transmission, in particular to a self-adaptive resonance coefficient control method, a subsynchronous oscillation suppression device and a converter.
Background
With the application of centralized large-scale new energy power generation, such as photovoltaic power generation, wind power generation, and the like, especially the application of full-power variable-flow wind generating sets, new power grid problems occur in the grid-connected operation process of large-scale sets in multiple areas, and the main manifestations of these field power grid problems are as follows: the low-order harmonic wave exceeds the standard; frequency out-of-range warning is frequently reported by booster station monitoring equipment due to severe frequency fluctuation; the phenomenon of stroboflash which can be distinguished by human eyes of the lighting fluorescent lamp in the power plant occurs.
The conventional control method can normally work under the condition that the voltage of the power grid side is normal, but when the number of units is increased, subsynchronous oscillation may occur to cause the voltage fluctuation of the power grid side, and further cause the power fluctuation of the power grid side, and along with the fluctuation, the operation mode or part of parameters of the system can be changed constantly along with the time, so that the subsynchronous resonance frequency of the system can be changed, and if the subsynchronous resonance frequency is calculated according to earlier parameters or unchangeable parameters, the precision of the control system can be seriously influenced. A general quasi-resonant controller can keep better control performance by setting a certain passband frequency, but cannot meet the control precision for a large-disturbance working state. When the deviation of the frequency and the set value is large, the gain of the resonance controller will be seriously reduced, so that the sub-synchronous oscillation harmonic wave cannot be tracked without static error.
Disclosure of Invention
The invention aims to regulate and control the resonance coefficient of a power grid and suppress subsynchronous oscillation.
In one aspect, an embodiment of the present invention provides a method for controlling a self-adaptive resonance coefficient, including:
acquiring subsynchronous oscillation electric energy generated by subsynchronous oscillation of a power transmission system;
obtaining quasi-resonance compensation parameters of the power transmission system according to the subsynchronous oscillation electric energy;
and dynamically adjusting the resonance coefficient of the system according to the quasi-resonance compensation parameter.
In some optional embodiments, obtaining the quasi-resonance compensation parameter of the power transmission system according to the subsynchronous oscillation power comprises:
determining subsynchronous harmonic components according to subsynchronous oscillation electric energy;
and obtaining quasi-resonance compensation parameters according to the difference value of the subsynchronous oscillation electric energy and the subsynchronous harmonic component.
In some optional embodiments, determining the subsynchronous harmonic component from the subsynchronous oscillation power comprises:
calculating to obtain the subsynchronous harmonic component according to the following formula;
in the formula, v in V being sub-synchronous oscillating electric energy out And M is a system resonance coefficient, H is a first gain coefficient, and K is a second gain coefficient.
In some optional embodiments, obtaining the quasi-resonance compensation parameter according to the difference between the subsynchronous oscillation electric energy and the subsynchronous harmonic component comprises:
and (4) passing the difference value through a fixed threshold range, and calculating according to a PI function to obtain a quasi-resonance compensation parameter.
On the other hand, the embodiment of the invention also provides a subsynchronous oscillation suppression method for controlling a converter, which comprises the following steps:
acquiring subsynchronous oscillation electric energy generated by subsynchronous oscillation of a power transmission system;
dynamically adjusting the system resonance coefficient of the power transmission system according to the subsynchronous oscillation electric energy and the self-adaptive resonance coefficient control method;
determining and adjusting subsynchronous harmonic components according to subsynchronous oscillation electric energy and a system resonance coefficient;
and controlling the converter to suppress the subsynchronous oscillation according to the subsynchronous harmonic component.
On the other hand, an embodiment of the present invention further provides a subsynchronous oscillation suppression apparatus, which is used for controlling a converter, and includes:
the acquisition module is used for acquiring subsynchronous oscillation electric energy generated by subsynchronous oscillation of the power transmission system;
the resonance coefficient control module is used for dynamically adjusting the system resonance coefficient of the power transmission system according to the subsynchronous oscillation electric energy;
the harmonic component control module is used for determining and adjusting subsynchronous harmonic components according to the subsynchronous oscillation electric energy and the system resonance coefficient;
and the feedback control module is used for controlling the converter to suppress the subsynchronous oscillation according to the subsynchronous harmonic component.
In some optional embodiments, the resonance coefficient control module comprises:
the compensation coefficient generation module is used for obtaining a quasi-resonance compensation parameter of the power transmission system according to the subsynchronous oscillation electric energy;
and the feedback adjusting module is used for dynamically adjusting the system resonance coefficient according to the quasi-resonance compensation parameter.
In some optional embodiments, the compensation parameter generation module comprises:
a difference value calculation unit: the device is used for calculating the difference value of subsynchronous oscillation electric energy and subsynchronous harmonic components;
a compensation parameter calculation unit: for determining a quasi-resonance compensation parameter based on the difference.
In some optional embodiments, the compensation parameter calculation unit includes:
a threshold limiting unit: for defining a difference output range;
a PI function calculation unit: for calculating quasi-resonance compensation parameters.
On the other hand, the embodiment of the invention also provides a controller of the converter, wherein the subsynchronous oscillation suppression device is arranged, and the converter is a converter of a wind generating set.
The technical scheme has the following beneficial effects: the resonance coefficient of the system can be adaptively adjusted in real time according to the change of the system running mode or parameters, the subsynchronous oscillation frequency can be adjusted in real time and can follow the change of the system, and therefore the subsynchronous oscillation suppressor can still better track the power grid frequency without dead time when the subsynchronous oscillation frequency changes, and better voltage waveform is output.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the embodiments or the prior art descriptions will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and other drawings can be obtained by those skilled in the art without creative efforts.
FIG. 1 is a schematic diagram illustrating an adaptive resonance coefficient control method according to an embodiment of the present invention;
FIG. 2 is a schematic control block diagram illustrating an adaptive resonance coefficient control method according to one embodiment of the present invention;
FIG. 3 is a schematic diagram illustrating a subsynchronous oscillation suppression method according to one embodiment of the invention;
FIG. 4 is a schematic diagram showing a grid-connected structure of a double-fed wind power system in the prior art;
FIG. 5 is a block diagram illustrating converter control in a subsynchronous oscillation suppression method according to one embodiment of the invention;
FIG. 6 is a schematic block diagram illustrating a prior art quasi-resonant controller;
FIG. 7 is a simulation graph showing the three-phase current suppression effect of a quasi-resonant controller when the harmonic frequency of the subsynchronous oscillation of the prior art changes;
FIG. 8 is a simulation diagram showing the single-phase current suppression effect of a quasi-resonant controller when the harmonic frequency of the sub-synchronous oscillation changes according to the prior art;
FIG. 9 is a simulation diagram showing the suppression effect of the three-phase current of the adaptive quasi-resonant controller when the frequency of the sub-synchronous oscillation harmonic changes in the sub-synchronous oscillation suppression method according to one embodiment of the present invention;
FIG. 10 is a simulation diagram showing the suppression effect of the single-phase current of the adaptive quasi-resonant controller when the frequency of the subsynchronous oscillation harmonic varies in the subsynchronous oscillation suppression method according to one embodiment of the invention;
fig. 11 is a schematic structural diagram showing a subsynchronous oscillation suppression apparatus according to an embodiment of the present invention;
fig. 12 is a schematic structural diagram showing a subsynchronous oscillation suppression apparatus according to still another embodiment of the present invention.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be obtained by a person skilled in the art without making any creative effort based on the embodiments in the present invention, belong to the protection scope of the present invention.
For better understanding of the present invention, an adaptive resonance coefficient control method, a sub-synchronization suppression method, an apparatus, and a controller of a converter according to an embodiment of the present invention are described in detail below with reference to fig. 1 to 12. It should be noted that these examples are not intended to limit the scope of the present disclosure.
Fig. 1 is a schematic diagram illustrating an adaptive resonance coefficient control method according to an embodiment of the present invention. The adaptive resonance coefficient control method 100 in the embodiment of the present invention includes steps 110 to 130.
And step 110, acquiring subsynchronous oscillation electric energy generated by subsynchronous oscillation of the power transmission system. Specifically, the subsynchronous oscillation electric energy may be a subsynchronous harmonic current or a subsynchronous harmonic voltage.
And step 120, obtaining quasi-resonance compensation parameters of the power transmission system according to the subsynchronous oscillation electric energy.
In one embodiment, step 120 may specifically include:
1) Determining subsynchronous harmonic components according to subsynchronous oscillation electric energy;
specifically, the calculation formula of the subsynchronous harmonic component is:
in the formula, v in V being sub-synchronous oscillating electric energy out And M is a system resonance coefficient, H is a first gain coefficient, and K is a second gain coefficient.
2) And obtaining a quasi-resonance compensation parameter according to the difference value eta v of the subsynchronous oscillation electric energy and the subsynchronous harmonic component.
And step 130, dynamically adjusting a system resonance coefficient according to the quasi-resonance compensation parameter.
Specifically, when η v > 0, the system resonance coefficient M increases, and the resonance frequency ω of the resonance controller increases 0 = MH increases with increasing system resonance coefficient M; when the time η ν is less than 0, isThe resonance frequency omega of the resonance controller is reduced by reducing the resonance coefficient M 0 = MH decreases as the system resonance coefficient M decreases.
In an embodiment, step 120 may specifically further include:
3) And (5) passing the difference eta ν > 0 through a fixed threshold range, and calculating according to a PI function to obtain a quasi-resonance compensation parameter.
Specifically, the difference η ν between the subsynchronous oscillation electric energy and the subsynchronous harmonic component can be limited within a fixed range δ through upper and lower thresholds, and the value of δ is generally a fixed value and can be determined according to specific error requirements. As shown in fig. 2, which is a schematic control block diagram of the adaptive resonance coefficient control method, in order to meet the requirement of the difference η ν range, the variation range of the difference η ν should not be too large, and the difference η ν signal can be set to vary within the cell δ, and the PI regulator can be used to dynamically regulate the system resonance coefficient M, thereby meeting the requirement of frequency adaptation.
Fig. 3 shows a schematic diagram of a subsynchronous oscillation suppression method according to an embodiment of the invention.
The subsynchronous oscillation suppression method 200 in the embodiment of the present invention includes steps 210 to 240.
And step 210, acquiring subsynchronous oscillation electric energy generated by subsynchronous oscillation of the power transmission system. In particular, the subsynchronous oscillating electrical energy may be a subsynchronous harmonic current and/or a subsynchronous harmonic voltage.
and step 230, determining and adjusting subsynchronous harmonic components according to the subsynchronous oscillation electric energy and the system resonance coefficient.
And step 240, controlling the converter to suppress subsynchronous oscillation according to the subsynchronous harmonic component.
If the power grid contains subsynchronous harmonic current, the output power of the power generation system fluctuates, so that the current instruction reference value output by the voltage outer ring PI regulator contains corresponding subsynchronous harmonic component, and the PI regulator regulates the current inner ring, so that the output voltage of the rotor side contains the subsynchronous harmonic component. The sub-synchronous harmonic component of the output voltage on the rotor side further induces a corresponding sub-synchronous harmonic current, and the stator harmonic current is further amplified by the stator to rotor coupling. It is due to this positive feedback that the system will oscillate subsynchronously.
In one embodiment, as shown in fig. 4 and 5, the power transmission system may be a wind power generation system, and the power electronic device connected to the generator set typically adopts magnetic field orientation control based on virtual flux linkage to realize torque and flux weakening decoupling control on the generator side; the power grid side adopts the directional control of the power grid voltage to realize active and reactive decoupling control. The three-phase current at the generator side is converted into current under an alpha beta coordinate system through Clark conversion and then is converted into torque current and weak magnetic current under a dq axis through Park, error current obtained by subtracting the torque set current and the weak magnetic set current from actual torque current and actual magnetic current is added into a dq axis coupling term through a current PI controller (ratio integration) to obtain reference voltage, and then is subjected to Park and SVPWM operation to obtain a switching signal, and the switching signal is output to a power electronic conversion device at the generator side, such as a rectifier, so that current closed-loop regulation is realized.
In order to suppress the subsynchronous oscillation of the wind turbine generator system, it is necessary to suppress the subsynchronous harmonic current on the stator side so that it is not amplified or even reduced. Therefore, by adding the subsynchronous harmonic current suppression ring using the subsynchronous oscillation suppression method to the rotor-side converter, the rotor can output corresponding voltage to eliminate the subsynchronous harmonic component action of the stator current.
In one embodiment, the subsynchronous oscillation electrical energy may be a difference between a given value of the stator-side subsynchronous harmonic current and an actual value of the stator-side subsynchronous harmonic current. The subsynchronous harmonic component may be a subsynchronous harmonic voltage of the corresponding output of the rotor side.
Specifically, the calculation formula of the subsynchronous harmonic voltage on the rotor side is as follows:
in the formula (I), the compound is shown in the specification,
respectively are given values of d-axis components and q-axis components of the sub-synchronous harmonic voltage at the rotor side,
respectively setting values i of sub-synchronous harmonic current d and q axis components at stator side sd 、i sq Actual values of d-axis component and q-axis component, K, generated by sub-synchronous current harmonic waves at stator side R Is the system gain factor, ω c In order to cut-off the frequency of the frequency,
is a sub-synchronous resonance frequency, wherein
Corresponding to step 120 in method 100, the following results are obtained:
according to the method 100, the system resonance coefficient M is adjusted, and the subsynchronous resonance frequency can be correspondingly adjusted
And performing self-adaptive adjustment.
Fig. 6 shows a schematic control block diagram of a quasi-resonant controller in the prior art, and fig. 7 and 8 show simulation graphs of three-phase current and single-phase suppression effect of the quasi-resonant controller when the sub-synchronous oscillation harmonic frequency changes in the prior art, wherein the sub-synchronous harmonic frequency is 12Hz. When the harmonic frequency of the subsynchronous oscillation changes, the control performance is greatly influenced because the resonance frequency of the quasi-resonance controller cannot be dynamically adjusted. When the given resonant frequency is fixed, the output signal leads the input signal if the frequency of the input signal is less than the given resonant frequency. Conversely, if the frequency of the input signal is greater than the resonant frequency, the output signal lags the input signal. Only when the frequency of the input signal is equal to the resonant frequency, the output signal can completely track the input signal, and the same frequency and same phase output can be achieved. As can be seen from fig. 7 and 8, the effect of the resonance controller is reduced when the sub-synchronous oscillation harmonic frequency is changed. After the addition of the quasi-resonant control loop, the current ripple is reduced, but the effect is far from satisfactory. It can be seen that when the sub-synchronous harmonic changes, the frequency adaptability of the quasi-resonant controller is poor, and improvement is still needed.
Fig. 9 and fig. 10 are simulation diagrams illustrating three-phase and single-phase current suppression effects of the adaptive quasi-resonant controller when the sub-synchronous oscillation harmonic frequency changes in the sub-synchronous oscillation suppression method according to an embodiment of the invention, wherein the sub-synchronous harmonic frequency is 12Hz. As can be seen from fig. 9 and 10, after the adaptive quasi-resonant controller adopting the adaptive resonant coefficient control method and the sub-synchronous oscillation suppression method according to the embodiments of the present invention replaces the quasi-resonant controller in the prior art, the suppression effect of the converter on the variation of the sub-synchronous oscillation harmonic frequency is more obvious. The three-phase currents are improved in the sine degree compared to before replacement, and the waveform distortion is reduced. Therefore, the subsynchronous oscillation suppression method provided by the invention is effective in suppressing subsynchronous oscillation, has better frequency adaptability and is more suitable for actual operation conditions.
Fig. 11 shows a schematic structural diagram of a subsynchronous oscillation suppression device according to an embodiment of the present invention. In one embodiment, the reference power curve generating apparatus 300 of the wind turbine generator set may include:
an obtaining module 310, configured to obtain sub-synchronous oscillation electric energy generated by sub-synchronous oscillation of a power transmission system;
the resonance coefficient control module 320 is configured to dynamically adjust a system resonance coefficient of the power transmission system according to the sub-synchronous oscillation electric energy;
the harmonic component control module 330 is configured to determine and adjust a sub-synchronous harmonic component according to the sub-synchronous oscillation power and the system resonance coefficient;
and the feedback control module 340 is configured to control the converter to suppress the subsynchronous oscillation according to the subsynchronous harmonic component.
Fig. 12 is a schematic structural diagram of a subsynchronous oscillation suppression apparatus according to still another embodiment of the present invention. In an embodiment, the resonance coefficient control module 320 may further include:
the compensation coefficient generation module 3201 is used for obtaining quasi-resonance compensation parameters of the power transmission system according to the subsynchronous oscillation electric energy;
and the feedback adjusting module 3202 is used for dynamically adjusting the system resonance coefficient according to the quasi-resonance compensation parameter.
In an embodiment, the compensation coefficient generating module 3201 may further include:
a difference value calculation unit: the device is used for calculating the difference value of subsynchronous oscillation electric energy and subsynchronous harmonic components;
a compensation parameter calculation unit: for determining quasi-resonance compensation parameters from the difference.
In an embodiment, the compensation parameter calculating unit may further include:
a threshold limiting unit: for defining a difference output range;
a PI function calculation unit: for calculating quasi-resonance compensation parameters.
The embodiment of the invention also provides a controller of the converter, which is provided with the subsynchronous oscillation suppression device, wherein the converter is a converter of a wind generating set. In particular, the converter may be a rotor-side converter of a doubly-fed wind power plant.
According to the adaptive resonance coefficient control method, the subsynchronous suppression method, the device and the converter controller, the resonance coefficient of a system can be adaptively adjusted in real time according to the change of the system operation mode or parameters, the subsynchronous oscillation frequency can be adjusted in real time and follows the change of the system, and therefore the subsynchronous oscillation suppressor can still better track the power grid frequency without dead time difference and output better voltage waveform when the subsynchronous oscillation frequency changes.
It should be noted that, in this document, relational terms such as first and second, and the like are used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Also, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrases "comprising a," "8230," "8230," or "comprising" does not exclude the presence of additional like elements in a process, method, article, or apparatus that comprises the element.
All the embodiments in the present specification are described in a related manner, and the same and similar parts among the embodiments may be referred to each other, and each embodiment focuses on the differences from the other embodiments. In particular, as for the device, the electronic device and the readable storage medium embodiments, since they are substantially similar to the method embodiments, the description is simple, and the relevant points can be referred to the partial description of the method embodiments.
The above description is only for the preferred embodiment of the present invention, and is not intended to limit the scope of the present invention. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention shall fall within the protection scope of the present invention.
Claims (8)
1. A resonance coefficient control method, characterized by comprising:
acquiring subsynchronous oscillation electric energy generated by subsynchronous oscillation of a power transmission system, wherein the subsynchronous oscillation electric energy is subsynchronous harmonic voltage;
determining subsynchronous harmonic components according to the subsynchronous oscillation electric energy;
according to the difference value between the subsynchronous oscillation electric energy and the subsynchronous harmonic component, enabling the difference value to pass through a fixed threshold range, and calculating according to a PI function to obtain a quasi-resonance compensation parameter;
and dynamically adjusting the resonance coefficient of the system according to the quasi-resonance compensation parameter.
2. The resonance coefficient control method according to claim 1, wherein determining a subsynchronous harmonic component from the subsynchronous oscillation electric energy comprises:
calculating the subsynchronous harmonic component according to the following formula;
in the formula, v in V being sub-synchronous oscillating electric energy out And M is a system resonance coefficient, H is a first gain coefficient, and K is a second gain coefficient.
3. A subsynchronous oscillation suppression method is used for controlling a converter, and is characterized by comprising the following steps:
acquiring subsynchronous oscillation electric energy generated by subsynchronous oscillation of a power transmission system, wherein the subsynchronous oscillation electric energy is subsynchronous harmonic voltage;
dynamically adjusting a system resonance coefficient of the power transmission system in accordance with the subsynchronous oscillating electrical energy and the resonance coefficient control method of claims 1-2;
determining and adjusting subsynchronous harmonic components according to the subsynchronous oscillation electric energy and the system resonance coefficient;
and controlling the converter to suppress the subsynchronous oscillation according to the subsynchronous harmonic component.
4. A subsynchronous oscillation suppression device for controlling a converter, comprising:
the acquisition module is used for acquiring subsynchronous oscillation electric energy generated by subsynchronous oscillation of the power transmission system, wherein the subsynchronous oscillation electric energy is subsynchronous harmonic voltage;
the resonance coefficient control module is used for dynamically adjusting the system resonance coefficient of the power transmission system according to the subsynchronous oscillation electric energy;
the harmonic component control module is used for determining and adjusting subsynchronous harmonic components according to the subsynchronous oscillation electric energy and the system resonance coefficient;
and the feedback control module is used for controlling the converter to inhibit the subsynchronous oscillation according to the subsynchronous harmonic component.
5. The subsynchronous oscillation suppression device of claim 4, wherein said resonance coefficient control module comprises:
the compensation coefficient generation module is used for obtaining quasi-resonance compensation parameters of the power transmission system according to the subsynchronous oscillation electric energy;
and the feedback adjusting module is used for dynamically adjusting the system resonance coefficient according to the quasi-resonance compensation parameter.
6. The subsynchronous oscillation suppression device of claim 5, wherein said compensation parameter generation module comprises:
a difference value calculation unit: calculating a difference between the subsynchronous oscillation electric energy and the subsynchronous harmonic component;
a compensation parameter calculation unit: for determining the quasi-resonance compensation parameter from the difference.
7. The subsynchronous oscillation suppression device according to claim 6, wherein said compensation parameter calculating unit comprises:
a threshold limiting unit: for defining the difference output range;
a PI function calculation unit: for calculating the quasi-resonance compensation parameter.
8. A controller for controlling a converter, wherein the subsynchronous oscillation suppression device of claims 4 to 7 is provided, and the converter is a converter of a wind turbine generator system.
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