CN115378054A - Hybrid control type full-power conversion wind turbine generator - Google Patents
Hybrid control type full-power conversion wind turbine generator Download PDFInfo
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J3/00—Circuit arrangements for ac mains or ac distribution networks
- H02J3/38—Arrangements for parallely feeding a single network by two or more generators, converters or transformers
- H02J3/46—Controlling of the sharing of output between the generators, converters, or transformers
- H02J3/48—Controlling the sharing of the in-phase component
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J3/00—Circuit arrangements for ac mains or ac distribution networks
- H02J3/38—Arrangements for parallely feeding a single network by two or more generators, converters or transformers
- H02J3/381—Dispersed generators
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J3/00—Circuit arrangements for ac mains or ac distribution networks
- H02J3/38—Arrangements for parallely feeding a single network by two or more generators, converters or transformers
- H02J3/40—Synchronising a generator for connection to a network or to another generator
- H02J3/42—Synchronising a generator for connection to a network or to another generator with automatic parallel connection when synchronisation is achieved
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J2300/00—Systems for supplying or distributing electric power characterised by decentralized, dispersed, or local generation
- H02J2300/20—The dispersed energy generation being of renewable origin
- H02J2300/28—The renewable source being wind energy
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- 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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Abstract
The invention discloses a hybrid control type full-power conversion wind turbine generator, which comprises a hybrid control type that the external characteristics of a network side converter are embodied as a voltage source and a current source, and inertia response control and stable control of a machine side converter; the hybrid control type full-power conversion wind turbine generator set comprises a plurality of groups of back-to-back converters, wherein part of the grid-side converters adopt phase-locked loops to lock the phase of a power grid; the decoupling control of active power and reactive power is completed under a synchronous rotating coordinate system; the rest part of the network side converter is controlled by a self-synchronizing voltage source based on the direct current bus dynamic state; and (3) completing the non-phase-locked loop grid-connected self-synchronization by utilizing a direct current capacitance dynamic equation and a rotor motion equation, and mapping the frequency change of the power grid in real time by the control output angular frequency of the rotor motion equation. According to the grid-side converter voltage source control method provided by the invention, the grid-connected self-synchronization control target is realized by using the direct current bus capacitance dynamic state and the rotor motion equation, and the voltage of the direct current bus is ensured to be kept stable.
Description
Technical Field
The invention relates to the technical field of electrical engineering, in particular to a hybrid control type full-power conversion wind turbine generator.
Background
In recent years, with the continuous development of wind power generation technology, the wind power permeability is continuously improved, and an offshore wind farm gradually becomes the mainstream trend of development in the industry. In order to reduce maintenance cost and improve power generation value as much as possible, a large-capacity permanent magnet direct-drive full-power conversion unit is generally adopted in an offshore wind farm. The wind turbine generator set is limited by the power transmission capability of a single power electronic converter, and in practical engineering, the wind turbine generator set usually adopts a parallel back-to-back converter structure, so that the power level and the operation reliability of the wind turbine generator set can be obviously improved.
The offshore wind turbine generator is connected to a power grid through a long-distance power transmission line, so that a weak connection relation exists between the wind turbine generator and the power grid, and under the condition, errors can be generated when a frequency detection link is adopted to detect the frequency of the power grid, and the inertia response stability of a machine side converter is further influenced. In addition, when the system frequency deviates from a normal state due to the change of the load of the power grid, the wind turbine generator controlled based on the phase-locked loop cannot respond to the change of the power grid frequency like a traditional synchronous generator, the integral inertia of the system is reduced, the difficulty of frequency adjustment is increased, and the safe and stable operation of the power network is endangered.
Disclosure of Invention
This section is for the purpose of summarizing some aspects of embodiments of the invention and to briefly introduce some preferred embodiments. In this section, as well as in the abstract and the title of the invention of this application, simplifications or omissions may be made to avoid obscuring the purpose of the section, the abstract and the title, and such simplifications or omissions are not intended to limit the scope of the invention.
The present invention has been made in view of the above-mentioned conventional problems.
Therefore, the invention provides a hybrid control type full-power conversion wind turbine generator set which can solve the problems that the dynamic response of voltage source control is poor and the wind turbine generator set cannot stably operate under the weak grid condition.
In order to solve the technical problems, the invention provides the following technical scheme: the external characteristics of the network side converter are embodied into a mixed control type of a voltage source and a current source, and the inertia response control and the stable control of the machine side converter are realized; the hybrid control type full-power conversion wind turbine generator set comprises a plurality of groups of back-to-back converters, wherein part of the grid-side converters adopt phase-locked loops to lock the phase of a power grid; the decoupling control of active power, reactive power and zero sequence current is completed under a synchronous rotating coordinate system; the rest part of the grid-side converter is controlled by a self-synchronizing voltage source based on direct-current bus dynamics; and (3) completing non-phase-locked loop grid-connected self-synchronization by using a direct-current capacitance dynamic equation and a rotor motion equation, wherein the control output angular frequency of the rotor motion equation maps the frequency change of the power grid in real time.
As a preferred scheme of the hybrid control type full-power conversion wind turbine generator set of the present invention, wherein: the voltage source control comprises that a PI regulator is adopted to regulate the voltage of a direct current bus; adding the output of the PI regulator and a power reference value to obtain an instruction value of analog mechanical power, and subtracting the instruction value from an actual value of active power at the network side; obtaining a compensation value of the output angular frequency of the converter through the rotor motion equation; and adding the reference value of the angular frequency and obtaining the phase angle of the output voltage modulation wave of the converter through integration.
As a preferred scheme of the hybrid control type full-power conversion wind turbine generator set of the present invention, wherein: the voltage source control adopts a control strategy comprising,
P m ＝P m0 +ΔP＝P m0 +H dc (u dc2 -u dc0 )
wherein, P m For virtual mechanical power input values, P m0 Is a virtual machine power reference value, P is the DC voltage regulator output, H dc Controlling a compensation function for the DC voltage loop u dc2 And u dc0 The actual value and the given value of the voltage of the direct current bus capacitor are respectively.
As a preferred scheme of the hybrid control type full-power conversion wind turbine generator set of the present invention, wherein: from the rotor motion equation the following equation can be derived,
wherein: p is g2 For the active power output of the converter, K z Is loop gain, J is virtual moment of inertia, D is virtual damping coefficient, omega 0 Is an angular velocity reference value, and omega is an angular velocity compensation value.
As a preferred scheme of the hybrid control type full-power conversion wind turbine generator set of the present invention, wherein: the phase angle omega of the modulation wave of the output voltage of the converter syn Comprises the steps of (a) preparing a substrate,
wherein, ω is syn Outputting an autonomous synchronous frequency, omega, for a converter b Is the angular velocity rating.
As a preferred scheme of the hybrid control type full-power conversion wind turbine generator set of the present invention, wherein: in order to meet the operation of unit power factor, the PI regulator is adopted to control the output reactive power of the converter, the output of the PI regulator is added with a voltage reference value to obtain the amplitude of the output voltage modulation wave of the converter, and the method comprises the following steps,
V t ＝V 0 +V Q ＝V 0 +H Q (Q gref -Q g2 )
wherein, V t For modulating the actual value of the voltage, V, of the current transformer 0 Is a reference value of the modulation voltage, H Q Controlling the transfer function, Q, for the reactive outer loop gref For a reactive reference value, Q g2 And outputting a reactive actual value for the converter.
As a preferred scheme of the hybrid control type full-power conversion wind turbine generator set of the present invention, wherein: a control strategy for adding damping compensation to an input power channel of a wind turbine generator comprises the following steps,
P s ＝P opt +H s (u dc0 -u dc2 )
wherein, P s Is the machine side converter power input, P opt For maximum wind energy capture function of machine side converter, H s The compensation function is damped for the input power channel.
As a preferred scheme of the hybrid control type full-power conversion wind turbine generator set of the present invention, wherein: the two machine side converters adopt a vector control strategy based on rotor flux linkage orientation, and obtain a current maximum wind power instruction value through a maximum wind energy tracking algorithm; passing the autonomous synchronization frequency through a transfer function to H iner The compensation link is superposed to the power outer ring instruction value to complete the frequency response of the wind turbine generator; the control loop can transmit the inertia of the wind wheel to the side of the power grid, so that the frequency response of the wind turbine generator to the power grid is achieved.
The invention has the beneficial effects that: 1. according to the hybrid control type full-power conversion wind turbine generator, a current source type control method is adopted for one group of grid-side converters of parallel back-to-back converters; in the hybrid control mode, the port impedance characteristic of the wind turbine generator is mainly represented as a controlled voltage source characteristic in a low-frequency band, and is not easy to be in cross coupling with a power grid to cause instability; the characteristic of controlled current source is mainly reflected in the middle and high frequency range, the characteristic of poor control dynamic response of the voltage source can be made up, the maximum wind energy can be always captured by the wind turbine generator, and the stable operation capability under the weak network can be improved; 2. according to the grid-side converter voltage source control method provided by the invention, the grid-connected self-synchronization control target is realized by using the direct current bus capacitor dynamic state and the rotor motion equation, and the change of the grid frequency can be mapped in real time by the rotor motion equation controller outputting the self-synchronization frequency on the premise of ensuring the direct current bus voltage to be stable; 3. according to the hybrid control type full-power conversion wind turbine generator, the autonomous synchronous frequency is introduced into the machine side converter power control outer ring without a frequency detection link, and the frequency support of the wind turbine generator on a power grid is realized.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings needed to be used in the description of the embodiments will be briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings based on these drawings without inventive exercise. Wherein:
fig. 1 is a schematic structural diagram of a system of a hybrid control type full-power conversion wind turbine generator according to an embodiment of the present invention;
fig. 2 is a schematic diagram of a control framework of a grid-side converter under voltage source control of a hybrid control type full-power conversion wind turbine generator according to an embodiment of the present invention;
fig. 3 is a schematic diagram of an outer ring control framework of a machine-side converter of a hybrid control type full-power conversion wind turbine generator according to an embodiment of the present invention;
fig. 4 is a schematic diagram of a time group operation response curve when the present invention is used in a simulation verification of a hybrid control type full-power conversion wind turbine generator according to an embodiment of the present invention when a grid frequency changes;
FIG. 5 is a schematic diagram of a frequency response curve when the present invention is applied to a power grid frequency change in a simulation verification of a hybrid control type full power conversion wind turbine generator according to an embodiment of the present invention;
fig. 6 is a schematic diagram of an impedance characteristic of an output port of a wind turbine generator when the hybrid control type full-power conversion wind turbine generator according to an embodiment of the present invention is used for simulation verification of the hybrid control type full-power conversion wind turbine generator.
Detailed Description
In order to make the aforementioned objects, features and advantages of the present invention more comprehensible, embodiments accompanying figures of the present invention are described in detail below, and it is apparent that the described embodiments are a part, not all or all of the embodiments of the present invention. All other embodiments, which can be obtained by a person skilled in the art without making creative efforts based on the embodiments of the present invention, shall fall within the protection scope of the present invention.
In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present invention, however, the present invention may be practiced otherwise than as specifically described herein, and it will be appreciated by those skilled in the art that the present invention may be practiced without departing from the spirit and scope of the present invention and that the present invention is not limited by the specific embodiments disclosed below.
Furthermore, reference herein to "one embodiment" or "an embodiment" means that a particular feature, structure, or characteristic described in connection with the embodiment is included in at least one implementation of the invention. The appearances of the phrase "in one embodiment" in various places in the specification are not necessarily all referring to the same embodiment, nor are separate or alternative embodiments mutually exclusive of other embodiments.
The present invention will be described in detail with reference to the drawings, wherein the cross-sectional views illustrating the structure of the device are not enlarged partially in general scale for convenience of illustration, and the drawings are only exemplary and should not be construed as limiting the scope of the present invention. In addition, the three-dimensional dimensions of length, width and depth should be included in the actual fabrication.
Meanwhile, in the description of the present invention, it should be noted that the terms "upper, lower, inner and outer" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are only for convenience of describing the present invention and simplifying the description, but do not indicate or imply that the referred device or element must have a specific orientation, be constructed in a specific orientation and operate, and thus, cannot be construed as limiting the present invention. Furthermore, the terms first, second, or third are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.
The terms "mounted, connected and connected" in the present invention are to be understood broadly, unless otherwise explicitly specified or limited, for example: can be fixedly connected, detachably connected or integrally connected; they may be mechanically, electrically, or directly connected, or indirectly connected through intervening media, or may be interconnected between two elements. The specific meanings of the above terms in the present invention can be understood in specific cases to those skilled in the art.
Example 1
Referring to fig. 1, 2 and 3, a first embodiment of the present invention provides a hybrid control type full power conversion wind turbine, which is characterized in that: comprises the steps of (a) preparing a mixture of a plurality of raw materials,
according to the schematic diagram of fig. 1, a schematic diagram of a wind turbine generator structure connected to a power grid system according to the present invention employs two groups of back-to-back converters, wherein one group of grid-side converters employs a conventional vector control strategy based on a phase-locked loop, which is named as converter 1, a filtering structure employs an LC filter, and both the phase-locked loop structure and the vector control block diagram are shown in the figure.
Another networking side converter operating as the voltage source control strategy of the present invention is named converter 2, and the filtering structure adopts a single L filter control block diagram as shown in the figure, wherein U f For the converter output voltage, U o To grid point voltage, U g For the grid voltage, I f For the net side converter output current, P s Active power, P, transferred to the DC bus for the machine side converter g Active power, Q, output for the network-side converter g For the converter output reactive power u dc Is a DC bus voltage, I s As generator current, V w Is the wind speed, ω m Is the generator speed, θ g To make the phase of the grid-connected point, θ r For the generator rotor angle, it is noted that the subscripts with 1 and 2 represent the grid-side converters 1 and 2, respectively, and the following table with dq indicates under a rotating coordinate system.
S1: the external characteristics of the grid-side converter are embodied as a mixed control type of a voltage source and a current source, and the inertia response control and the stable control of the machine-side converter are realized.
S2: the hybrid control type full-power conversion wind turbine generator set comprises a plurality of groups of back-to-back converters, wherein part of the grid-side converters adopt phase-locked loops to achieve the locking of the phase of a power grid.
S3: and completing decoupling control of active power, reactive power and zero-sequence current under a synchronous rotating coordinate system.
S4: and the rest grid-side converter adopts self-synchronizing voltage source control based on the direct current bus dynamics.
S5: and (3) completing the non-phase-locked loop grid-connected self-synchronization by utilizing a direct current capacitance dynamic equation and a rotor motion equation, and mapping the frequency change of the power grid in real time by the control output angular frequency of the rotor motion equation.
Specifically, referring to fig. 2, the voltage source control includes:
adjusting the voltage of the direct current bus by adopting a PI (proportional integral) adjuster;
adding the output of the PI regulator and a power reference value to obtain an instruction value of analog mechanical power, and subtracting the instruction value from an actual value of active power at the network side;
obtaining a compensation value of the output angular frequency of the converter through a rotor motion equation;
and adding the reference value of the angular frequency and obtaining the phase angle of the output voltage modulation wave of the converter through integration.
The voltage source control adopts a control strategy comprising:
P m ＝P m0 +ΔP＝P m0 +H dc (u dc2 -u dc0 )
wherein, P m For virtual mechanical power input values, P m0 Is a virtual machine power reference value, P is the DC voltage regulator output, H dc Control of the compensation function for the DC voltage loop u dc2 And u dc0 The actual value and the given value of the voltage of the direct current bus capacitor are respectively.
From the rotor motion equation the following equation can be derived,
wherein: p g2 For the active power output of the converter, K z Is loop gain, J is virtual moment of inertia, D is virtual damping coefficient, omega 0 The reference value of the angular velocity is adopted, and omega is the compensation value of the angular velocity;
the phase angle omega of the modulation wave of the output voltage of the converter syn Comprises the steps of (a) preparing a mixture of a plurality of raw materials,
wherein, ω is syn Outputting an autonomous synchronous frequency, omega, for a converter b Is the angular velocity rating.
In order to meet the operation of unit power factor, the PI regulator is adopted to control the output reactive power of the converter, the output of the PI regulator is added with a voltage reference value to obtain the amplitude of the modulation wave of the output voltage of the converter, and the method comprises the following steps:
V t ＝V 0 +V Q ＝V 0 +H Q (Q gref -Q g2 )
wherein, V t For modulating the actual value of the voltage, V, of the current transformer 0 Is a reference value of the modulation voltage, H Q Controlling the transfer function, Q, for the reactive outer loop gref For a reactive reference value, Q g2 And outputting a reactive actual value for the converter.
Referring to fig. 3, a control block diagram of the machine side converters is shown, the machine side converters are responsible for controlling wind power captured by a wind wheel, the two machine side converters both adopt a vector control mode based on rotor flux orientation, and in order to enhance system operation stability and anti-interference capability, a control strategy of adding damping compensation in an input power channel of a wind turbine generator includes:
P s ＝P opt +H s (u dc0 -u dc2 )
wherein, P s Is the machine side converter power input, P opt For maximum wind energy capture function of the machine side converter, H s The compensation function is damped for the input power channel.
The two machine side converters adopt a vector control strategy based on rotor flux linkage orientation, and obtain a current maximum wind power instruction value through a maximum wind energy tracking algorithm;
passing the autonomous synchronization frequency through a transfer function as H iner The compensation step is superposed outside the powerA ring instruction value, which completes the frequency response of the wind turbine;
the control loop can transmit the inertia of the wind wheel to the side of the power grid, so that the frequency response of the wind turbine generator to the power grid is achieved, the realization formula is as follows,
P s ＝P opt +H iner ω syn
it is easy to understand that the offshore full-power conversion wind turbine generator adopts a parallel back-to-back converter structure due to large capacity, wherein a grid-side converter of one group of back-to-back converters adopts a current source control method; and the other group of grid-side converters adopt a voltage source control method.
The impedance characteristic of the wind turbine generator adopting the hybrid control type is mainly embodied as a controlled voltage source at a low frequency band, so that the problem of interaction instability with a power grid is not easy to occur; the characteristic of controlled current source is mainly reflected in the middle and high frequency range, the characteristic of poor control dynamic response of the voltage source can be made up, and the wind turbine generator can capture maximum wind energy all the time.
The grid-side converter adopting the voltage source control method is mainly realized by combining direct current capacitor dynamic control with a rotor motion equation, so that grid-connection self-synchronization without a phase-locked loop can be realized, and the control output of the rotor motion equation can map the frequency change of a power grid in real time while the direct current bus voltage is stabilized.
Preferably, the control output autonomous synchronous frequency of the rotor motion equation is introduced into the control of a machine side converter of the full-power conversion wind turbine generator, so that the wind turbine generator can realize a frequency response function without a frequency detection device, and frequency support is provided for a power grid.
Example 2
Referring to fig. 4, fig. 5 and fig. 6, for the second embodiment of the present invention, a simulation verification method for a hybrid control type full-power conversion wind turbine generator is provided, which specifically includes:
the simulation platform adopts PSCAD, wherein the capacity of the wind turbine generator is selected to be 6.25MW, the rated value of the voltage of a direct current bus is 1200V, the effective value of the voltage of an alternating current side line is 690V, the rated frequency of the system is 50Hz, both filter inductors are selected to be 35uH, and the filter capacitor is selected to be 1602 uF.
Referring to fig. 4, a response curve of the dc bus voltage and the autonomous synchronization frequency of the grid-side converter for voltage source control is shown, where the grid frequency is changed from 1pu to 0.99pu at t =4s, and is changed from t =8s to 1.01 pu; it can be seen that the voltage of the direct current bus can be well maintained at 1200V, the autonomous synchronous frequency presents a change rule consistent with the frequency of the power grid, the system can stably operate according to a response curve, and the correctness of the voltage source control method is proved.
Referring to fig. 5, a response curve of the output active power and the rotor speed of the wind turbine generator is given, when the grid frequency is changed from 1pu to 0.99pu at t =4s, and when the grid frequency is changed from 1.01pu to t =8 s; when the voltage frequency changes, the rotating speed of the rotor is decelerated or accelerated to further improve or absorb the output power of the wind turbine generator, and the verification proves that the method can provide frequency support for a power grid.
Referring to fig. 6, a port impedance baud chart of the wind turbine generator is given, and by scanning the port characteristics under the method of the present invention and respectively scanning the impedance frequency domain of the wind turbine generator adopting the conventional control strategy and the voltage source control strategy, as shown by the curves in the diagram, it can be seen that the port impedance characteristics of the wind turbine generator mainly represent the controlled voltage source in the low frequency band and the controlled current source in the medium and high frequency bands.
It should be noted that the above-mentioned embodiments are only for illustrating the technical solutions of the present invention and not for limiting, and although the present invention is described in detail with reference to the preferred embodiments, it should be understood by those skilled in the art that modifications or equivalent substitutions can be made to the technical solutions of the present invention without departing from the spirit and scope of the technical solutions of the present invention, which should be covered by the claims of the present invention.
Claims (8)
1. A hybrid control type full power conversion wind turbine generator system is characterized in that: comprises the steps of (a) preparing a mixture of a plurality of raw materials,
the external characteristics of the network side converter are embodied as a mixed control type of a voltage source and a current source, and the inertia response control and the stable control of the machine side converter are realized;
the hybrid control type full-power conversion wind turbine generator comprises a plurality of groups of back-to-back converters, wherein part of the grid-side converters adopt phase-locked loops to lock the phase of a power grid;
the decoupling control of active power, reactive power and zero sequence current is completed under a synchronous rotating coordinate system;
the rest part of the network side converter is controlled by a self-synchronizing voltage source based on the direct current bus dynamic state;
and (3) completing non-phase-locked loop grid-connected self-synchronization by using a direct-current capacitance dynamic equation and a rotor motion equation, wherein the control output angular frequency of the rotor motion equation maps the frequency change of the power grid in real time.
2. The hybrid control type full-power conversion wind turbine generator set according to claim 1, characterized in that: the voltage source control includes the steps of,
adjusting the voltage of the direct current bus by adopting a PI (proportional integral) regulator;
adding the output of the PI regulator and a power reference value to obtain an instruction value of analog mechanical power, and subtracting the instruction value from an actual value of active power at the network side;
obtaining a compensation value of the output angular frequency of the converter through the rotor motion equation;
and adding the reference value of the angular frequency and obtaining the phase angle of the output voltage modulation wave of the converter through integration.
3. The hybrid control type full-power conversion wind turbine generator set according to claim 2, characterized in that: the voltage source control adopts a control strategy comprising,
P m ＝P m0 +ΔP＝P m0 +H dc (u dc2 -u dc0 )
wherein, P m For virtual mechanical power input values, P m0 Is a virtual machine power reference value, P is the DC voltage regulator output, H dc Control of the compensation function for the DC voltage loop u dc2 And u dc0 The actual value and the given value of the voltage of the direct current bus capacitor are respectively.
4. The hybrid control type full-power conversion wind turbine generator set according to claim 2 or 3, characterized in that: from the rotor motion equation the following equation can be derived,
wherein: p g2 For the active power output of the converter, K z Is loop gain, J is virtual moment of inertia, D is virtual damping coefficient, omega 0 Is an angular velocity reference value, and omega is an angular velocity compensation value.
5. The hybrid control type full-power conversion wind turbine generator set according to claim 4, characterized in that: the phase angle omega of the modulation wave of the output voltage of the converter syn Comprises the steps of (a) preparing a mixture of a plurality of raw materials,
wherein, ω is syn Outputting an autonomous synchronous frequency, omega, for a converter b Is the angular velocity rating.
6. The hybrid control type full-power conversion wind turbine generator according to claim 5, characterized in that: in order to meet the operation of unit power factor, the PI regulator is adopted to control the output reactive power of the converter, the output of the PI regulator is added with a voltage reference value to obtain the amplitude of the output voltage modulation wave of the converter, and the method comprises the following steps,
V t ＝V 0 +V Q ＝V 0 +H Q (Q gref -Q g2 )
wherein, V t For modulating the actual value of the voltage, V, of the current transformer 0 Is a reference value of the modulation voltage, H Q For the reactive outer loop control transfer function,Q gref to a reactive reference value, Q g2 And outputting a reactive actual value for the converter.
7. The hybrid control type full-power conversion wind turbine generator set according to claim 6, characterized in that: a control strategy for adding damping compensation to an input power channel of a wind turbine generator comprises the following steps,
P s ＝P opt +H s (u dc0 -u dc2 )
wherein, P s Is the machine side converter power input, P opt For maximum wind energy capture function of machine side converter, H s The compensation function is damped for the input power channel.
8. The hybrid control type full-power conversion wind turbine generator set according to claim 7, characterized in that: also comprises the following steps of (1) preparing,
the two machine side converters adopt a vector control strategy based on rotor flux linkage orientation, and obtain a current maximum wind power instruction value through a maximum wind energy tracking algorithm;
passing the autonomous synchronization frequency through a transfer function to H iner The compensation link is superposed to the power outer ring instruction value to complete the frequency response of the wind turbine generator;
the control loop can transmit the inertia of the wind wheel to the side of the power grid, so that the frequency response of the wind turbine generator to the power grid is achieved.
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