CN115589031A - Permanent magnet direct-drive wind mechanism network type control method and device, terminal and storage medium - Google Patents

Permanent magnet direct-drive wind mechanism network type control method and device, terminal and storage medium Download PDF

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CN115589031A
CN115589031A CN202211155848.2A CN202211155848A CN115589031A CN 115589031 A CN115589031 A CN 115589031A CN 202211155848 A CN202211155848 A CN 202211155848A CN 115589031 A CN115589031 A CN 115589031A
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permanent magnet
magnet direct
drive fan
grid
active power
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孟建辉
孙瑀晗
王毅
王东旭
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North China Electric Power University
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North China Electric Power University
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    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J3/00—Circuit arrangements for ac mains or ac distribution networks
    • H02J3/38—Arrangements for parallely feeding a single network by two or more generators, converters or transformers
    • H02J3/46—Controlling of the sharing of output between the generators, converters, or transformers
    • H02J3/466—Scheduling the operation of the generators, e.g. connecting or disconnecting generators to meet a given demand
    • 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
    • H02J3/001—Methods to deal with contingencies, e.g. abnormalities, faults or failures
    • 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
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J2203/00—Indexing scheme relating to details of circuit arrangements for AC mains or AC distribution networks
    • H02J2203/20—Simulating, e g planning, reliability check, modelling or computer assisted design [CAD]
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J2300/00—Systems for supplying or distributing electric power characterised by decentralized, dispersed, or local generation
    • H02J2300/20—The dispersed energy generation being of renewable origin
    • H02J2300/28—The renewable source being wind energy
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E10/00—Energy generation through renewable energy sources
    • Y02E10/70—Wind energy
    • Y02E10/76—Power conversion electric or electronic aspects

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  • Control Of Eletrric Generators (AREA)

Abstract

The invention provides a permanent magnet direct-drive wind mechanism network type control method, a permanent magnet direct-drive wind mechanism network type control device, a terminal and a storage medium. The method comprises the following steps: constructing a grid-connected system of the permanent magnetic direct-drive fan through a low-frequency power transmission line; acquiring a port voltage effective value of the permanent magnet direct-drive fan in the grid-connected system during a fault period; determining an active power reference value based on VSM control during the fault period according to the port voltage effective value and the port rated voltage effective value of the permanent-magnet direct-drive fan; and performing virtual synchronous machine control on the output of the permanent magnetic direct drive fan at a power grid side converter of the permanent magnetic direct drive fan according to the active power reference value during the fault period, and outputting the controlled direct current bus voltage. The invention can improve the VSM control loop by utilizing the effective value function of the voltage of the fan port during the fault period, and reduce the transient fluctuation of the unit.

Description

Permanent magnet direct-drive wind mechanism network type control method and device, terminal and storage medium
Technical Field
The invention relates to the technical field of control, in particular to a permanent magnet direct drive fan network construction type control method, device, terminal and storage medium.
Background
The traditional power transmission technology is generally applied in a few scenes and has great loss in the transportation process, and when the transportation range is wider, for example, hundreds of kilometers, the cost of the traditional power transmission technology is higher, so the important development direction of the future energy industry is wind power generation. The offshore wind energy resource is rich and does not occupy land resources, so the installation scale can be larger, and the offshore wind energy resource has huge development potential. Open sea wind power is also becoming the focus of offshore wind power project development.
Large-scale wind power generation is integrated into a power grid by depending on a power electronic device, but the inertia and the damping characteristics of the traditional synchronous generator are lacked. And a Virtual Synchronous Machine (VSM) type network construction type control strategy is adopted for the wind turbine grid-side inverter, so that the frequency and voltage stability challenge brought to the system by low inertia is expected to be solved. Compared with a network following type control strategy requiring a phase-locked loop, the VSM controls the output frequency through simulating the inertia and damping characteristics of the synchronous generator, however, when the power frequency side power grid fails, the correlation between the change rate of the active power of the fan and the change rate of the system frequency is not large, so that the traditional VSM control loop is utilized, and the transient fluctuation of the unit can not be obviously reduced.
Disclosure of Invention
The embodiment of the invention provides a permanent magnet direct-drive wind mechanism network type control method, a permanent magnet direct-drive wind mechanism network type control device, a permanent magnet direct-drive wind mechanism terminal and a storage medium, and aims to solve the problem that transient state fluctuation of a unit cannot be obviously reduced by adopting a VSM control loop in the prior art.
In a first aspect, an embodiment of the present invention provides a Permanent Magnet direct drive wind turbine (PMSG) networking type control method, including:
constructing a grid-connected system of the permanent magnetic direct-drive fan through a low-frequency power transmission line;
acquiring a port voltage effective value of the permanent magnet direct-drive fan in the grid-connected system during a fault period;
determining an active power reference value based on VSM control during the fault period according to the port voltage effective value and the port rated voltage effective value of the permanent-magnet direct-drive fan;
and performing virtual synchronous machine control on the output of the permanent magnet direct drive fan at a power grid side converter of the permanent magnet direct drive fan according to the active power reference value during the fault period, and outputting the controlled direct current bus voltage.
In one possible implementation manner of the first aspect, the grid-connected system includes: the system comprises a wind driven generator, a permanent magnet direct drive fan, a current converter, a step-up transformer, a low-frequency power transmission line and an alternating-current-alternating-current frequency converter;
the output end of the wind driven generator is connected with the input end of the permanent magnetic direct drive fan, the output end of the permanent magnetic direct drive fan is connected with the input end of the converter, the output end of the converter is connected with the input end of the step-up transformer, the output end of the step-up transformer is connected with the input end of the alternating current-alternating current frequency converter through a low-frequency power transmission line, and the output end of the alternating current-alternating current frequency converter is connected with a system power grid;
the converter comprises a fan side converter and a power grid side converter, and the fan side converter and the power grid side converter are connected in series.
In a possible implementation manner of the first aspect, the determining, according to the port voltage effective value and the port rated voltage effective value of the permanent-magnet direct-drive wind turbine, an active power reference value output by a grid-side converter of the permanent-magnet direct-drive wind turbine under VSM control during the fault period includes:
when the effective value of the port voltage is less than or equal to a first preset voltage value, according to the
Figure BDA0003857903840000021
Determining an active power reference value output by a power grid side converter of the permanent magnet direct-drive fan based on VSM control during the fault period;
wherein, P ref Representing an active power reference value, P, output by a grid-side converter of the permanent magnet direct-drive fan based on VSM control during the fault 0 Represents the active Power reference value, P, under Maximum Power Point Tracking (MPPT) N Indicating that the permanent magnet direct drive fanThe rated active power value of the port, U represents the effective value of the port voltage, U N The terminal rated voltage effective value of the permanent magnet direct drive fan is represented.
In a possible implementation manner of the first aspect, the determining, according to the port voltage effective value and the port rated voltage effective value of the permanent-magnet direct-drive wind turbine, an active power reference value output by a grid-side converter of the permanent-magnet direct-drive wind turbine under VSM control during the fault period includes:
when the effective value of the port voltage is greater than a first preset voltage value and less than or equal to a second preset voltage value, according to
Figure BDA0003857903840000031
And determining an active power reference value output by a power grid side converter of the permanent magnet direct-drive fan under VSM control during the fault period.
In a possible implementation manner of the first aspect, in a grid-side converter of the permanent-magnet direct-drive wind turbine, performing virtual synchronous machine control on an output of the permanent-magnet direct-drive wind turbine according to the active power reference value during the fault, and outputting a controlled dc bus voltage, the method includes:
determining a phase angle of a power supply of a power grid side converter of the permanent magnet direct drive fan based on VSM control according to the active power reference value during the fault period and an actual active power value output by the permanent magnet direct drive fan;
determining a first control signal of a power grid side converter of the permanent magnet direct-drive fan according to the phase angle;
acquiring initial direct-current bus voltage output by the permanent-magnet direct-drive fan through a machine side converter during the fault period;
carrying out virtual impedance control and current limiting control on the first control signal to obtain a second control signal;
and according to a second control signal, performing pulse width modulation on the initial direct current bus voltage input into the power grid side converter of the permanent magnet direct drive fan, and outputting the controlled direct current bus voltage.
In a possible implementation manner of the first aspect, the determining a phase angle of a grid-side converter power supply of the permanent magnet direct drive wind turbine based on VSM control according to the active power reference value during the fault and an actual active power value output by the permanent magnet direct drive wind turbine includes:
calculating to obtain virtual angular frequency of a power grid side converter power supply of the permanent magnet direct drive fan based on VSM control according to the active power reference value during the fault period and the actual active power value output by the permanent magnet direct drive fan;
and integrating the virtual angular frequency to obtain a phase angle of a power grid side converter power supply of the permanent magnet direct drive fan based on VSM control.
In a possible implementation manner of the first aspect, the calculating, according to the active power reference value during the fault and the actual active power value output by the permanent-magnet direct-drive wind turbine, a virtual angular frequency of a grid-side converter power supply of the permanent-magnet direct-drive wind turbine based on VSM control includes:
according to
Figure BDA0003857903840000041
Calculating to obtain virtual angular frequency of a power grid side converter power supply of the permanent magnet direct drive fan based on VSM control;
j represents a virtual inertia coefficient based on VSM control, P represents an active power value actually output by the permanent magnet direct-drive fan, omega represents the virtual angular frequency, and omega represents omega 0 Denotes a reference angular frequency, and D denotes a damping coefficient based on VSM control.
In a second aspect, an embodiment of the present invention provides a permanent magnet direct drive fan network configuration type control apparatus, including:
the system construction module is used for constructing a grid-connected system of the permanent magnet direct-drive fan through a low-frequency power transmission line;
the acquisition module is used for acquiring a port voltage effective value of the permanent magnet direct-drive fan in the grid-connected system during a fault period;
the determining module is used for determining an active power reference value based on VSM control during the fault period according to the port voltage effective value and the port rated voltage effective value of the permanent-magnet direct-drive fan;
and the output module is used for performing virtual synchronous machine control on the output of the permanent magnet direct drive fan according to the active power reference value during the fault period on a power grid side converter of the permanent magnet direct drive fan and outputting the controlled direct current bus voltage.
In a third aspect, an embodiment of the present invention provides a terminal, including 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 according to the first aspect or any possible implementation manner of the first aspect when executing the computer program.
In a fourth aspect, an embodiment of the present invention provides a computer-readable storage medium, where a computer program is stored, and the computer program, when executed by a processor, implements the steps of the method according to the first aspect or any one of the possible implementation manners of the first aspect.
The embodiment of the invention provides a network type control method, a device, a terminal and a storage medium for a permanent magnet direct-drive wind mechanism, which are characterized in that a grid-connected system of a permanent magnet direct-drive fan through a low-frequency power transmission line is constructed; acquiring a port voltage effective value of the permanent magnet direct-drive fan in the grid-connected system during a fault period; determining an active power reference value based on VSM control during the fault period according to the port voltage effective value and the port rated voltage effective value of the permanent-magnet direct-drive fan; and performing virtual synchronous machine control on the output of the permanent magnetic direct drive fan at a power grid side converter of the permanent magnetic direct drive fan according to the active power reference value during the fault period, and outputting the controlled direct current bus voltage. The voltage fluctuation condition of the corresponding port can be better judged by acquiring the rated effective value of the port voltage and the effective value of the port voltage during the fault, different VSM control is carried out according to different effective values of the voltage, and finally the VSM control is utilized to carry out stable control on the fluctuation state of the bus voltage output by the permanent-magnet direct-drive fan. Therefore, the network type control method of the permanent magnet direct-drive wind mechanism provided by the embodiment of the invention can accurately and effectively perform virtual synchronous control on the output of the permanent magnet direct-drive wind turbine so as to better cope with emergency situations and obviously relieve transient fluctuation of the unit when a power grid fails.
Drawings
In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings needed to be used in the embodiments or the prior art descriptions will be briefly described 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.
Fig. 1 is a schematic flow chart of an implementation of a permanent magnet direct-drive wind mechanism grid-type control method according to an embodiment of the present invention;
FIG. 2 is a system structure diagram of the permanent magnet direct drive fan of the invention after low-frequency power transmission grid connection;
FIG. 3 is a block diagram of a fan converter control according to the present invention;
FIG. 4 is a block diagram of an improved VSM control according to the present invention;
fig. 5 is a graph of a change in dc bus voltage when a power frequency side grid fails according to the improved VSM control method of the present invention.
Fig. 6 is a schematic structural diagram of a permanent magnet direct drive fan network control device according to an embodiment of the present application;
fig. 7 is a schematic structural diagram of a terminal according to an embodiment of the present application.
Detailed Description
In the following description, for purposes of explanation and not limitation, specific details are set forth such as particular system structures, techniques, etc. in order to provide a thorough understanding of the embodiments of the invention. It will be apparent, however, to one skilled in the art that the present invention may be practiced in other embodiments that depart from these specific details. In other instances, detailed descriptions of well-known systems, devices, circuits, and methods are omitted so as not to obscure the description of the present invention with unnecessary detail.
In order to actively cope with climate change, accelerate the construction of a clean, low-carbon and safe energy system, and strive to complete the strategic goal of 'carbon peak reaching and carbon neutralization', new energy power generation represented by wind power generation is increasingly applied to a power system. Compared with other energy sources, the wind energy has stronger advantages in technology and cost.
The traditional power electronic device is connected to a power system and cannot well control the output power and voltage fluctuation of a wind driven generator in the power transmission process, so that the power quality of a power generation system is influenced, and a large power failure can be caused in serious cases.
Under the control, the grid-connected inverter can participate in the adjustment of the voltage and the frequency of a power grid, and the flexibility is higher. However, when a power frequency side power grid fails, the transient fluctuation of the unit cannot be obviously reduced by the existing VSM control strategy, so the embodiment provides a permanent magnet direct-drive wind turbine grid type control method.
In order to make the objects, technical solutions and advantages of the present invention more apparent, the following description is made by way of specific embodiments with reference to the accompanying drawings.
Fig. 1 shows a schematic implementation flow diagram of a network type control method for a permanent magnet direct-drive wind mechanism according to an embodiment of the present invention, which is described in detail below.
101, constructing a grid-connected system of the permanent magnet direct-drive fan through a low-frequency power transmission line.
In one possible implementation mode, the grid-connected system comprises a wind driven generator, a permanent magnet direct-drive fan, a current converter, a step-up transformer, a low-frequency power transmission line and an alternating-current-alternating-current frequency converter, and wind power is converted into electric power and input into a system grid based on the grid-connected system.
Referring to fig. 2, an output end of the wind driven generator is connected to an input end of the permanent magnetic direct drive fan, an output end of the permanent magnetic direct drive fan is connected to an input end of the inverter, an output end of the inverter is connected to an input end of the step-up transformer, an output end of the step-up transformer is connected to an input end of the ac-ac frequency converter through the low frequency power transmission line, and an output end of the ac-ac frequency converter is connected to a system power grid.
The converter comprises a fan side converter and a power grid side converter, and the fan side converter and the power grid side converter are connected in series.
In fig. 2, a wind power generator converts wind power into electric energy, the electric energy is input into a permanent-magnet direct-drive fan, the permanent-magnet direct-drive fan is used for generating power, the voltage output by the permanent-magnet direct-drive fan is controlled by a fan side converter and a grid side converter, then the voltage is boosted by a boosting transformer, the boosting transformer is connected with a low-frequency power transmission line, the boosted voltage is input into an alternating-current-alternating-current frequency converter through the low-frequency power transmission line for frequency conversion processing, and then the voltage is merged into an alternating-current bus power grid.
102, acquiring a port voltage effective value of a permanent magnet direct-drive fan in a grid-connected system during a fault period.
The correlation between the active power change of the fan and the frequency variation of the grid-connected system is not large during the power frequency side grid fault period, and the fault voltage of the port of the permanent-magnet direct-drive fan affects the output active power, so that the effective value of the port voltage of the permanent-magnet direct-drive fan in the grid-connected system during the fault period needs to be acquired so as to calculate the active power reference value based on VSM control during the subsequent fault period.
And 103, determining an active power reference value based on VSM control during the fault period according to the port voltage effective value and the port rated voltage effective value of the permanent magnet direct drive fan.
Optionally, the effective value of the rated voltage of the port of the permanent-magnet direct-drive fan can be obtained in advance, for example, the effective value can be obtained from a motor nameplate of the permanent-magnet direct-drive fan.
When the active power reference value based on VSM control during the fault is calculated, different modes can be adopted for calculating according to different port voltage effective values.
In one possible embodiment, when the effective value of the port voltage is less than or equal to the first preset voltage value, the method is based on
Figure BDA0003857903840000081
Power grid side switching of permanent magnet direct-drive fan based on VSM control during fault determinationThe active power reference value output by the current device.
Wherein, P ref Representing an active power reference value, P, output by a grid-side converter of a permanent magnet direct-drive fan under VSM control during a fault 0 Representing the reference value of active power, P, at MPPT N Expressing the rated active power value of a port of the permanent magnet direct drive fan, wherein U represents the effective value of the port voltage, and U represents the effective value of the port voltage N The terminal rated voltage effective value of the permanent magnet direct drive fan is represented.
Optionally, the first preset voltage value may be set according to an actual requirement, and a value of the first preset voltage value is not limited in this embodiment, for example, the first preset voltage value may be 0.5V, 0.6V, or 0.8V.
Referring to the improved loop part in fig. 3, when the effective value of the port voltage is less than or equal to the first preset voltage value, the following loop is determined, namely the effective value U of the port rated voltage of the permanent magnet direct drive fan N The square of the port voltage and the square of the effective value U of the port voltage, and
Figure BDA0003857903840000082
multiplication of the result with P N Multiply with P 0 Making a difference to obtain P ref 。
In a possible embodiment, when the effective value of the port voltage is greater than the first preset voltage value and less than or equal to the second preset voltage value, the method is based on
Figure BDA0003857903840000083
And determining an active power reference value output by a power grid side converter of the permanent magnet direct-driven fan under VSM control during the fault period.
Optionally, the second preset voltage value may be set according to an actual requirement, a value of the second preset voltage value is not limited in this embodiment, for example, the first preset voltage value may be 1.
Referring to the improved loop part in fig. 3, when the port voltage effective value is greater than the first preset voltage value and less than or equal to the second preset voltage value, the above loop is adopted, that is, the port rated voltage effective value U of the permanent magnet direct drive fan N The difference from the port voltage effective value U,and with
Figure BDA0003857903840000084
Multiplication of the result with P N Multiply with P 0 Making a difference to obtain P ref 。
Optionally, by selecting a corresponding calculation mode, an active power reference value output by a power grid side converter of the permanent magnet direct-drive wind turbine can be determined in a proper mode when the port voltage effective values U are different, so that virtual synchronous machine control can be performed on the output of the permanent magnet direct-drive wind turbine during a fault according to different active power reference values, and transient fluctuation of the wind turbine generator during the fault is improved.
And step 104, performing virtual synchronous machine control on the output of the permanent magnetic direct drive fan according to the active power reference value during the fault period at a power grid side converter of the permanent magnetic direct drive fan, and outputting the controlled direct current bus voltage.
This step may include:
s1, determining a phase angle of a power supply of a power grid side converter of the permanent magnet direct drive fan based on VSM control according to an active power reference value during a fault period and an actual active power value output by the permanent magnet direct drive fan.
Referring to fig. 3, when calculating the phase angle of the power supply of the power grid side converter of the permanent-magnet direct-drive wind turbine based on VSM control, the virtual angular frequency of the power supply of the power grid side converter of the permanent-magnet direct-drive wind turbine based on VSM control can be calculated according to the active power reference value during the fault period and the actual active power value output by the permanent-magnet direct-drive wind turbine; and integrating the virtual angular frequency to obtain a phase angle of a power grid side converter power supply of the permanent magnet direct-drive fan based on VSM control.
In a possible implementation manner, when the virtual angular frequency of the grid-side converter power supply of the permanent magnet direct-drive fan based on the VSM control is obtained through calculation, the virtual angular frequency can be obtained according to the virtual angular frequency
Figure BDA0003857903840000091
Wherein J represents a virtual inertia coefficient based on VSM control, and P represents the actual output of the permanent magnet direct-drive fanThe active power value, ω, represents the virtual angular frequency, ω 0 Denotes a reference angular frequency, and D denotes a damping coefficient based on VSM control.
Referring to the mechanical part of fig. 3, P is calculated in step 103 ref Then, the difference is made with P, and the obtained power difference is divided by omega 0 And D (ω) 0 ω) and finally multiplied by
Figure BDA0003857903840000092
A virtual angular frequency is obtained. The virtual angular frequency calculated has two outputs, one is the sum of ω 0 Multiplying the difference by D to obtain the VSM control quantity, namely D (omega) 0 And omega), and the other is used as an output, and the phase angle of a power grid side converter power supply of the permanent magnet direct drive fan based on VSM control is obtained through integration.
Optionally, the formula for calculating the phase angle is as follows:
θ = ≈ ω d ω; where θ is the phase angle. The phase angle is obtained based on VSM control and is used for inhibiting the bus voltage in a fluctuation state output by the permanent magnet direct drive fan during the fault period, so that the bus voltage obtained after the inhibition is stable.
And S2, determining a first control signal of a power grid side converter of the permanent magnet direct-drive fan according to the phase angle.
Referring to fig. 4, the output phase angle θ and the output voltage amplitude E are subjected to coordinate conversion to obtain a first control signal of the grid-side converter of the permanent magnet direct-drive fan. The first control signal is a voltage reference value obtained by coordinate transformation of the output voltage amplitude E and the phase angle theta.
The coordinate transformation converts E and theta from an abc three-phase static coordinate system to an alpha beta two-phase static coordinate system, and the coordinate transformation enables parameters after the coordinate transformation to be directly applied to virtual impedance control, so that the control difficulty is reduced.
And S3, acquiring the initial direct-current bus voltage output by the permanent-magnet direct-drive fan through the machine side converter during the fault period.
Referring to fig. 4, the voltage and current output by the permanent-magnet direct-drive fan are used as the input of a machine side converter of the permanent-magnet direct-drive fan, and the machine side converter outputs an initial direct-current bus voltage after adopting constant direct-current voltage control, vector control and sine pulse width modulation.
And S4, carrying out virtual impedance control and current limiting control on the first control signal to obtain a second control signal.
Optionally, before performing the virtual impedance control and the current limiting control on the first control signal, the first control signal and U are first compared gαβ And (5) performing difference calculation to obtain a voltage difference value. Wherein, U gαβ And the actual value of the output voltage of the grid-side converter of the permanent-magnet direct-drive fan under the two-phase static coordinate system.
Optionally, the virtual impedance can be used to improve the problem of uneven power distribution of the microgrid, and the transient virtual impedance can also be used to reduce the surge current of the power electronic converter under the condition of fault or sudden load increase, so as to effectively prevent the converter from overloading. In fig. 4, the actual voltage value in the first control signal is compared with the reference voltage value U gαβ The difference value of the current and the current of the permanent magnet direct drive fan network side converter under the two-phase static coordinate system is controlled by the virtual impedance to obtain a controlled output current, the output current is subjected to current limiting control and then outputs a current reference value after current limiting, difference operation is carried out on the current reference value after current limiting and an actual current value output by the permanent magnet direct drive fan network side converter under the two-phase static coordinate system, and a voltage reference value after current control, namely a second control signal, is output.
Optionally, the Current limit control includes Current Saturation Algorithm (CSA) Current limit and Current control.
The CSA current limiting is a current control strategy based on a current saturation algorithm, a current amplitude limiting value is calculated by using the current saturation algorithm, and the current is limited by the current amplitude limiting value. When the controlled output current does not exceed the amplitude limit value, the current output after the CSA current limiting is the controlled output current. When the controlled output current exceeds the amplitude limit value, the current output after the CSA current limiting is the current amplitude limit value. In fig. 4, the controlled output current is limited by the CSA and then outputs a current reference value in the limited α β two-phase stationary coordinate system.
Referring to fig. 4, after current limiting, the α β two-phase stationary coordinate systemThe current reference value in the current control and the actual current value I in the alpha beta two-phase static coordinate system gαβ And (5) making a difference, and outputting a voltage reference value of the grid-side converter under the alpha and beta coordinate subjected to current control, namely a second control signal.
And S5, according to the second control signal, performing pulse width modulation on the initial direct current bus voltage of the power grid side converter input into the permanent magnet direct drive fan, and outputting the controlled direct current bus voltage.
In fig. 4, the second control signal is first combined with U before the dummy impedance control and the current limiting control are performed on the first control signal gαβ And calculating the voltage variation under the alpha and beta two-phase static coordinate system by taking the difference. Wherein, U gαβ And the actual value of the output voltage of the grid-side converter of the permanent-magnet direct-drive fan under the two-phase static coordinate system.
And obtaining the sine wave alternating voltage to be subjected to pulse width modulation after the voltage variation is subjected to coordinate conversion.
The coordinate conversion converts the voltage variation from an alpha beta two-phase static coordinate system to an abc three-phase static coordinate system.
Optionally, the Pulse Width Modulation may be Sine Pulse Width Modulation (SPWM). Sinusoidal pulse width modulation can control the output voltage by varying the pulse width.
In one possible embodiment, the sine wave ac voltage after pulse width modulation is output as a modulation signal, and then the controlled dc bus voltage is output.
When the system fails, the virtual synchronous generator can control the primary frequency modulation and voltage regulation of the analog synchronous generator to enable the analog synchronous generator to have damping voltage, and stable support of frequency and voltage is achieved. And then the DC bus voltage to be output is obtained through virtual impedance control, current limiting control and pulse width modulation after coordinate system conversion.
FIG. 5 shows the variation of the DC bus voltage output by the fan in the case of a power frequency side grid voltage drop to 0.5p.u, comparing the improved VSM control with the conventional VSM control, wherein the improved VSM control is a solid line, the conventional VSM control is a dotted line, t is simulation time, and V is dc Is the DC bus voltage of the fan. The invention is applied to the grid-connected simulation platform, and the grid-side converter adopts an improved VSM control strategy; the voltage of a power frequency side power grid is set to fall to 0.5p.u.at 1s, the voltage is recovered at 1.5s, and the voltage of a fan port also falls to 0.5p.u.at 1s-1.5s due to the fault ride-through strategy of the M3C. It can be seen from fig. 5 that the oscillation amplitude of the improved VSM control is smaller during a fault, the line is smoother, the fluctuation amplitude is about 1200, and there is no large fluctuation, while the fluctuation amplitude of the conventional VSM control is larger, the lowest peak value and the highest peak value appear between 1s and 1.5s, and the analysis shows that the difference between the two peak values is larger. Therefore, the improved VSM control is obviously stable in the traditional VSM control, and the improved VSM control is beneficial to reducing the fluctuation of the direct current bus voltage.
According to the grid control method for the permanent magnet direct-drive wind mechanism, on the premise that the correlation of the change of active power to the system frequency variation is not high in the power frequency side grid fault period, the influence of the fault voltage of the fan port on the output active power is considered, so that the functional relation between the active power reference value and the fan port voltage effective value is established, the active power reference value is compensated by constructing a micro-grid system in which permanent magnet direct-drive fans are connected to the grid through a back-to-back converter, the virtual synchronous machine control technology is improved, the fan port voltage effective value function is utilized to achieve the compensation of the active power reference value during the fault period, the flexible adjustment of a virtual inertia coefficient is achieved, the oscillation amplitude of the direct current bus voltage can be well reduced, and the transient fluctuation of a unit is improved.
It should be understood that, the sequence numbers of the steps in the foregoing embodiments do not imply an execution sequence, and the execution sequence of each process should be determined by its function and inherent logic, and should not constitute any limitation to the implementation process of the embodiments of the present application.
In the following, embodiments of the apparatus of the present application are provided, and for details which are not described in detail therein, reference may be made to the corresponding method embodiments described above.
Fig. 6 shows a schematic structural diagram of a permanent magnet direct drive wind turbine grid type control device provided in the embodiment of the present application, and for convenience of description, only parts related to the embodiment of the present application are shown, and details are as follows:
as shown in fig. 6, the permanent magnet direct drive wind turbine configuration type control device 600 includes: a system building module 601, an obtaining module 602, a determining module 603 and an output module 604.
The system construction module 601 is used for constructing a grid-connected system of the permanent magnetic direct-drive fan through the low-frequency power transmission line;
an obtaining module 602, configured to obtain a port voltage effective value of a permanent magnet direct drive fan in a grid-connected system during a fault period;
the determining module 603 is configured to determine an active power reference value based on VSM control during a fault period according to the port voltage effective value and the port rated voltage effective value of the permanent magnet direct drive fan;
and the output module 604 is configured to perform virtual synchronous machine control on the output of the permanent magnet direct-drive fan at a power grid side converter of the permanent magnet direct-drive fan according to an active power reference value during a fault period, and output a controlled dc bus voltage.
In one possible embodiment, a grid tie system includes: the system comprises a wind driven generator, a permanent magnetic direct drive fan, a current converter, a step-up transformer, a low-frequency transmission line and an AC-AC frequency converter;
the output end of the wind driven generator is connected with the input end of the permanent magnetic direct drive fan, the output end of the permanent magnetic direct drive fan is connected with the input end of the current converter, the output end of the current converter is connected with the input end of the step-up transformer, the output end of the step-up transformer is connected with the input end of the AC-AC frequency converter through the low-frequency transmission line, and the output end of the AC-AC frequency converter is connected with the system power grid;
the converter comprises a fan side converter and a power grid side converter which are connected in series.
In a possible embodiment, the determining module 603 is configured to, when determining the active power reference value output by the grid-side inverter of the permanent-magnet direct-drive wind turbine under the VSM control during the fault according to the port voltage effective value and the port rated voltage effective value of the permanent-magnet direct-drive wind turbine,:
when the effective value of the port voltage is less than or equal to a first preset voltage value
Figure BDA0003857903840000131
Determining an active power reference value output by a power grid side converter of the permanent magnet direct-driven fan under VSM control during a fault period;
wherein, P ref Representing an active power reference value, P, output by a grid-side converter of a permanent magnet direct-drive fan under VSM control during a fault 0 Representing the reference value of active power, P, at MPPT N Expressing the rated active power value of a port of the permanent magnet direct drive fan, wherein U represents the effective value of the port voltage, and U represents the effective value of the port voltage N The terminal rated voltage effective value of the permanent magnet direct drive fan is represented.
In a possible embodiment, the determining module 603 is configured to determine a port voltage effective value and a port rated voltage effective value of the permanent magnet direct drive fan, and when determining an active power reference value output by a grid-side converter of the permanent magnet direct drive fan under VSM control during a fault, the determining module is configured to:
when the effective value of the port voltage is greater than the first preset voltage value and the effective value of the port voltage is less than or equal to the second preset voltage value, according to
Figure BDA0003857903840000141
And determining an active power reference value output by a power grid side converter of the permanent magnet direct-drive fan under VSM control during the fault.
In a possible implementation manner, the output module 604 performs virtual synchronous machine control on the output of the permanent-magnet direct-drive wind turbine according to the active power reference value during the fault, and when outputting the controlled dc bus voltage, is configured to:
determining a phase angle of a power grid side converter power supply of the permanent magnet direct drive fan based on VSM control according to an active power reference value during a fault period and an actual active power value output by the permanent magnet direct drive fan;
determining a first control signal of a power grid side converter of the permanent magnetic direct drive fan according to the phase angle;
acquiring initial direct-current bus voltage output by the permanent-magnet direct-drive fan through a machine side converter during a fault period;
carrying out virtual impedance control and current limiting control on the first control signal to obtain a second control signal;
and according to the second control signal, carrying out pulse width modulation on the initial direct-current bus voltage of the power grid side converter input into the permanent-magnet direct-drive fan, and outputting the controlled direct-current bus voltage.
In a possible embodiment, the output module 604 is configured to, when determining the phase angle of the grid-side converter power supply of the permanent-magnet direct-drive wind turbine based on the VSM control according to the active power reference value during the fault and the actual active power value output by the permanent-magnet direct-drive wind turbine,:
calculating to obtain virtual angular frequency of a power grid side converter power supply of the permanent magnetic direct drive fan based on VSM control according to an active power reference value during the fault period and an actual active power value output by the permanent magnetic direct drive fan;
and integrating the virtual angular frequency to obtain a phase angle of a power grid side converter power supply of the permanent magnet direct-drive fan based on VSM control.
In a possible embodiment, the output module 604 is configured to, when calculating the virtual angular frequency of the power grid side converter power supply of the permanent magnetic direct drive fan based on the VSM control according to the active power reference value during the fault and the actual active power value output by the permanent magnetic direct drive fan,:
according to
Figure BDA0003857903840000151
Calculating to obtain virtual angular frequency of a power grid side converter power supply of the permanent magnet direct drive fan based on VSM control;
j represents a virtual inertia coefficient based on VSM control, P represents an active power value actually output by the permanent magnet direct-drive fan, omega represents a virtual angular frequency, and omega represents 0 Denotes a reference angular frequency, and D denotes a damping coefficient based on VSM control.
According to the grid-type control device for the permanent magnet direct-drive fan, on the premise that the correlation of the change of active power to the system frequency variation is not high during the power frequency side grid fault period, the influence of fan port fault voltage on the output active power is considered, so that the functional relation between the active power reference value and the fan port voltage effective value is established, the active power reference value is compensated by constructing a micro-grid system in which the permanent magnet direct-drive fan is connected to the grid through a back-to-back converter, an improved virtual synchronous machine control technology is adopted, the fan port voltage effective value function during the fault period is utilized to achieve flexible adjustment of the virtual inertia coefficient, and the oscillation amplitude of direct current bus voltage can be well reduced to improve transient fluctuation of a unit.
Fig. 7 is a schematic structural diagram of a terminal according to an embodiment of the present application. As shown in fig. 7, the terminal 700 of this embodiment includes: a processor 701, a memory 702, and a computer program 703 stored in the memory 702 and executable on the processor 701. The processor 701, when executing the computer program 703, implements the steps in the above-described embodiments of the distribution network engineering cost prediction method, such as the steps 101 to 103 shown in fig. 1. Alternatively, the processor 701, when executing the computer program 303, implements the functions of the modules in the above-described apparatus embodiments, for example, the functions of the modules 601 to 603 shown in fig. 6.
Illustratively, the computer program 703 may be partitioned into one or more modules, which are stored in the memory 702 and executed by the processor 701 to accomplish the present application. One or more of the modules may be a series of computer program instruction segments capable of performing certain functions, which are used to describe the execution of the computer program 703 in the terminal 700. For example, the computer program 703 may be divided into the modules 601 to 603 shown in fig. 6.
The terminal 700 may be a computing device such as a desktop computer, a notebook, a palm top computer, and a cloud server. Terminal 700 can include, but is not limited to, a processor 701, a memory 702. Those skilled in the art will appreciate that fig. 7 is only an example of a terminal 700 and does not constitute a limitation of terminal 700 and may include more or less components than those shown, or combine certain components, or different components, e.g., the terminal may also include input-output devices, network access devices, buses, etc.
The Processor 701 may be a Central Processing Unit (CPU), other general purpose Processor, a Digital Signal Processor (DSP), an Application Specific Integrated Circuit (ASIC), a Field Programmable Gate Array (FPGA) or other Programmable logic device, discrete Gate or transistor logic device, discrete hardware component, or the like. A general purpose processor may be a microprocessor or the processor may be any conventional processor or the like.
The storage 702 may be an internal storage unit of the terminal 700, such as a hard disk or a memory of the terminal 700. The memory 702 may also be an external storage device of the terminal 700, such as a plug-in hard disk, a Smart Media Card (SMC), a Secure Digital (SD) Card, a Flash memory Card (Flash Card), etc. provided on the terminal 700. Further, the memory 702 can include both internal and external memory units of the terminal 700. The memory 702 is used for storing computer programs and other programs and data required by the terminal. The memory 702 may also be used to temporarily store data that has been output or is to be output.
It will be apparent to those skilled in the art that, for convenience and brevity of description, only the above-mentioned division of the functional units and modules is illustrated, and in practical applications, the above-mentioned function distribution may be performed by different functional units and modules according to needs, that is, the internal structure of the apparatus is divided into different functional units or modules, so as to perform all or part of the functions described above. Each functional unit and module in the embodiments may be integrated in one processing unit, or each unit may exist alone physically, or two or more units are integrated in one unit, and the integrated unit may be implemented in a form of hardware, or in a form of software functional unit. In addition, specific names of the functional units and modules are only for convenience of distinguishing from each other, and are not used for limiting the protection scope of the present application. The specific working processes of the units and modules in the system may refer to the corresponding processes in the foregoing method embodiments, and are not described herein again.
In the above embodiments, the description of each embodiment has its own emphasis, and reference may be made to the related description of other embodiments for parts that are not described or recited in any embodiment.
Those of ordinary skill in the art will appreciate that the various illustrative elements and algorithm steps described in connection with the embodiments disclosed herein may be implemented as electronic hardware or combinations of computer software and electronic hardware. Whether such functionality is implemented as hardware or software depends upon the particular application and design constraints imposed on the implementation. Skilled artisans may implement the described functionality in varying ways for each particular application, but such implementation decisions should not be interpreted as causing a departure from the scope of the present application.
In the embodiments provided in the present application, it should be understood that the disclosed apparatus/terminal and method may be implemented in other ways. For example, the above-described apparatus/terminal embodiments are merely illustrative, and for example, a module or a unit may be divided into only one logical function, and may be implemented in other ways, for example, a plurality of units or components may be combined or integrated into another system, or some features may be omitted or not executed. In addition, the shown or discussed mutual coupling or direct coupling or communication connection may be through some interfaces, indirect coupling or communication connection of devices or units, and may be in an electrical, mechanical or other form.
Units described as separate parts may or may not be physically separate, and parts displayed as units may or may not be physical units, may be located in one place, or may be distributed on a plurality of network units. Some or all of the units can be selected according to actual needs to achieve the purpose of the solution of the embodiment.
In addition, functional units in the embodiments of the present application may be integrated into one processing unit, or each unit may exist alone physically, or two or more units are integrated into one unit. The integrated unit can be realized in a form of hardware, and can also be realized in a form of a software functional unit.
The integrated module, if implemented in the form of a software functional unit and sold or used as a separate product, may be stored in a computer readable storage medium. Based on such understanding, all or part of the processes in the method according to the embodiments of the present application may also be implemented by a computer program to instruct related hardware, where the computer program may be stored in a computer readable storage medium, and when the computer program is executed by a processor, the computer program may implement the steps of the above embodiments of the distribution network engineering cost prediction method. Wherein the computer program comprises computer program code, which may be in the form of source code, object code, an executable file or some intermediate form, etc. The computer readable medium may include: any entity or device capable of carrying computer program code, recording medium, U.S. disk, removable hard disk, magnetic disk, optical disk, computer Memory, read-Only Memory (ROM), random Access Memory (RAM), electrical carrier wave signals, telecommunications signals, software distribution media, and the like. It should be noted that the computer readable medium may include any suitable increase or decrease as required by legislation and patent practice in the jurisdiction, for example, in some jurisdictions, computer readable media may not include electrical carrier signals and telecommunications signals in accordance with legislation and patent practice.
While the invention has been described with reference to specific embodiments, the scope of the invention is not limited thereto, and those skilled in the art can easily conceive various equivalent modifications or substitutions within the technical scope of the invention, and these modifications or substitutions are intended to be included in the scope of the invention. Therefore, the protection scope of the present application shall be subject to the protection scope of the claims.

Claims (10)

1. A permanent magnet direct drive fan network construction type control method is characterized by comprising the following steps:
constructing a grid-connected system of the permanent magnetic direct-drive fan through a low-frequency power transmission line;
acquiring a port voltage effective value of the permanent magnet direct-drive fan in the grid-connected system during a fault period;
determining an active power reference value based on VSM control during the fault period according to the port voltage effective value and the port rated voltage effective value of the permanent-magnet direct-drive fan;
and performing virtual synchronous machine control on the output of the permanent magnet direct drive fan at a power grid side converter of the permanent magnet direct drive fan according to the active power reference value during the fault period, and outputting the controlled direct current bus voltage.
2. The grid type control method for the permanent magnet direct-drive wind mechanism according to claim 1, wherein the grid-connected system comprises: the system comprises a wind driven generator, a permanent magnet direct drive fan, a current converter, a step-up transformer, a low-frequency power transmission line and an alternating-current-alternating-current frequency converter;
the output end of the wind driven generator is connected with the input end of the permanent magnetic direct drive fan, the output end of the permanent magnetic direct drive fan is connected with the input end of the converter, the output end of the converter is connected with the input end of the step-up transformer, the output end of the step-up transformer is connected with the input end of the alternating current-alternating current frequency converter through a low-frequency power transmission line, and the output end of the alternating current-alternating current frequency converter is connected with a system power grid;
the converter comprises a fan side converter and a power grid side converter, and the fan side converter and the power grid side converter are connected in series.
3. The grid type control method for the permanent magnet direct drive wind mechanism according to claim 1, wherein the step of determining the active power reference value output by the grid-side converter of the permanent magnet direct drive wind turbine under VSM control during the fault period according to the port voltage effective value and the port rated voltage effective value of the permanent magnet direct drive wind turbine comprises the following steps:
when the effective value of the port voltage is less than or equal to a first preset voltage value, the method is based on
Figure FDA0003857903830000011
Determining active power parameters output by a power grid side converter of the permanent magnet direct-drive fan based on VSM control during the fault periodTaking a reference value;
wherein, P ref Representing an active power reference value, P, output by a grid-side converter of the permanent magnet direct-drive fan based on VSM control during the fault 0 Representing the active power reference value, P, at MPPT N Expressing the rated active power value of the port of the permanent magnet direct drive fan, wherein U represents the effective value of the port voltage, and U represents the effective value of the port voltage N The terminal rated voltage effective value of the permanent magnet direct drive fan is represented.
4. The grid type control method for the permanent magnet direct drive wind mechanism according to claim 3, wherein the step of determining the active power reference value output by the grid-side converter of the permanent magnet direct drive wind turbine under VSM control during the fault period according to the port voltage effective value and the port rated voltage effective value of the permanent magnet direct drive wind turbine comprises the following steps:
when the effective value of the port voltage is greater than a first preset voltage value and the effective value of the port voltage is less than or equal to a second preset voltage value, according to
Figure FDA0003857903830000021
And determining an active power reference value output by a power grid side converter of the permanent magnet direct-drive fan under VSM control during the fault period.
5. The grid type control method for the permanent magnet direct-drive wind mechanism according to claim 4, wherein a grid-side converter of the permanent magnet direct-drive wind turbine performs virtual synchronous machine control on the output of the permanent magnet direct-drive wind turbine according to the active power reference value during the fault period, and outputs the controlled direct-current bus voltage, and the method comprises the following steps:
determining a phase angle of a power grid side converter power supply of the permanent magnetic direct drive fan based on VSM control according to the active power reference value during the fault period and an actual active power value output by the permanent magnetic direct drive fan;
determining a first control signal of a power grid side converter of the permanent magnet direct-drive fan according to the phase angle;
acquiring initial direct-current bus voltage output by the permanent-magnet direct-drive fan through a machine side converter during the fault period;
carrying out virtual impedance control and current limiting control on the first control signal to obtain a second control signal;
and according to a second control signal, performing pulse width modulation on the initial direct current bus voltage input into the power grid side converter of the permanent magnet direct drive fan, and outputting the controlled direct current bus voltage.
6. The grid-type control method for the permanent magnet direct-drive wind turbine according to claim 5, wherein the step of determining the phase angle of the grid-side converter power supply of the permanent magnet direct-drive wind turbine based on VSM control according to the active power reference value during the fault and the actual active power value output by the permanent magnet direct-drive wind turbine comprises the following steps:
calculating to obtain virtual angular frequency of a power grid side converter power supply of the permanent magnetic direct drive fan based on VSM control according to the active power reference value during the fault period and an actual active power value output by the permanent magnetic direct drive fan;
and integrating the virtual angular frequency to obtain a phase angle of a power grid side converter power supply of the permanent magnet direct drive fan based on VSM control.
7. The grid type control method for the permanent magnet direct-drive wind turbine according to claim 6, wherein the step of calculating a virtual angular frequency of a power grid side converter power supply of the permanent magnet direct-drive wind turbine based on VSM control according to the active power reference value during the fault and an actual active power value output by the permanent magnet direct-drive wind turbine comprises the following steps:
according to
Figure FDA0003857903830000031
Calculating the virtual angular frequency of a power grid side converter power supply of the permanent magnet direct drive fan based on VSM control;
wherein J represents a virtual inertia coefficient based on VSM control, and P representsThe active power value actually output by the permanent magnet direct drive fan, omega, represents the virtual angular frequency, omega 0 Denotes a reference angular frequency, and D denotes a damping coefficient based on VSM control.
8. A permanent-magnet direct-drive fan network construction type control device is characterized by comprising:
the system construction module is used for constructing a grid-connected system of the permanent magnet direct-drive fan through a low-frequency power transmission line;
the acquisition module is used for acquiring a port voltage effective value of the permanent magnet direct-drive fan in the grid-connected system during a fault period;
the determining module is used for determining an active power reference value based on VSM control during the fault period according to the port voltage effective value and the port rated voltage effective value of the permanent-magnet direct-drive fan;
and the output module is used for performing virtual synchronous machine control on the output of the permanent magnet direct drive fan according to the active power reference value during the fault period on a power grid side converter of the permanent magnet direct drive fan and outputting the controlled direct current bus voltage.
9. A terminal device comprising a memory, a processor and a computer program stored in the memory and executable on the processor, characterized in that the processor realizes the steps of the method according to any of claims 1 to 7 when executing the computer program.
10. A computer-readable storage medium, in which a computer program is stored which, when being executed by a processor, carries out the steps of the method according to any one of claims 1 to 7.
CN202211155848.2A 2022-09-22 2022-09-22 Permanent magnet direct-drive wind mechanism network type control method and device, terminal and storage medium Pending CN115589031A (en)

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN116181487A (en) * 2023-04-28 2023-05-30 沈阳微控主动磁悬浮技术产业研究院有限公司 Flywheel energy storage-based gas turbine power generation system and control method thereof

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN116181487A (en) * 2023-04-28 2023-05-30 沈阳微控主动磁悬浮技术产业研究院有限公司 Flywheel energy storage-based gas turbine power generation system and control method thereof
CN116181487B (en) * 2023-04-28 2023-07-11 沈阳微控主动磁悬浮技术产业研究院有限公司 Flywheel energy storage-based gas turbine power generation system and control method thereof

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