CN116742688A - Full wind speed section inertia response control system of voltage source full power wind turbine generator system - Google Patents
Full wind speed section inertia response control system of voltage source full power wind turbine generator system 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
- H02J3/381—Dispersed generators
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F03—MACHINES OR ENGINES FOR LIQUIDS; WIND, SPRING, OR WEIGHT MOTORS; PRODUCING MECHANICAL POWER OR A REACTIVE PROPULSIVE THRUST, NOT OTHERWISE PROVIDED FOR
- F03D—WIND MOTORS
- F03D7/00—Controlling wind motors
- F03D7/02—Controlling wind motors the wind motors having rotation axis substantially parallel to the air flow entering the rotor
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F03—MACHINES OR ENGINES FOR LIQUIDS; WIND, SPRING, OR WEIGHT MOTORS; PRODUCING MECHANICAL POWER OR A REACTIVE PROPULSIVE THRUST, NOT OTHERWISE PROVIDED FOR
- F03D—WIND MOTORS
- F03D9/00—Adaptations of wind motors for special use; Combinations of wind motors with apparatus driven thereby; Wind motors specially adapted for installation in particular locations
- F03D9/20—Wind motors characterised by the driven apparatus
- F03D9/25—Wind motors characterised by the driven apparatus the apparatus being an electrical generator
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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
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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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- 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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- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Control Of Eletrric Generators (AREA)
- Wind Motors (AREA)
Abstract
The application provides a full wind speed section inertia response control system of a voltage source full power wind turbine generator, comprising: network side converter control module: the grid-side converter is used for controlling the full-power wind turbine generator; a machine side converter control module: the machine side converter is used for controlling the full-power wind turbine generator; a selective inertia response control module: the method is used for judging the operation stage of the wind turbine according to the current rotating speed and the output power of the full-power wind turbine, and selecting different inertia influence control methods; the rotating speed flexible switching control module: the method is used for controlling the rotating speed of the full-power wind turbine generator in the stages of low constant rotating speed, maximum power tracking, high constant rotating speed and variable pitch power limit of the full-power wind turbine generator. Compared with the prior art, the method for controlling the inertia influence between the full wind speed sections of the wind turbine generator is used for seamless switching, and the impact of the inertia response control method switching at different operation stages on the rotation speed and the power generation power of the wind turbine generator is eliminated.
Description
Technical Field
The application relates to the technical field of full-power wind turbine generator control, in particular to a full-wind speed section inertia response control system of a voltage source full-power wind turbine generator.
Background
In recent years, along with the shortage of traditional primary energy fossil fuels, new energy such as wind power, photovoltaic and the like is greatly developed in countries around the world, and it is estimated that the global total installed capacity of wind power in 2022 will reach 840.9GW. With the gradual expansion of the installed capacity of wind power and photovoltaic, the structural transformation of the power system is happening silently, and the power system which is mainly used by a synchronous machine in the prior art gradually shows the characteristic of double high, namely high-proportion power electronic equipment and high-proportion new energy. In the power demand link, wind power and photovoltaic play a heavier role than the past in the future, the incremental replacement process is accelerated, and the incremental replacement process becomes a dominant power supply.
The network side converter of the traditional full-power wind turbine generator system mostly adopts a vector control mode, the outer loop controls the direct current bus voltage and the grid-connected power factor, and the inner loop current control enables the active power and the reactive power to be decoupled, and the method essentially belongs to a current source type control mode. Due to the isolation effect of the back-to-back double PWM converters of the wind power converter, the wind power machine cannot embody inertia to the power grid and cannot actively support the power grid. The total inertia of the novel power system gradually decreases, and the tendency of weakening is presented, and the frequency stability of the novel power system is seriously affected. Therefore, a novel control mode of the full-power wind turbine generator is necessary to be provided, so that the full-power wind turbine generator can provide inertia for a power grid like a traditional synchronous generator, and active support of transient frequency and voltage is realized.
The voltage source type control mode is a brand new control mode, is also called networking type control, does not rely on a phase-locked loop to detect the voltage of a power grid to realize the synchronization of a converter and the power grid like a traditional current source type wind turbine generator, realizes the autonomous synchronization with the power grid by simulating a rotor motion equation of a synchronous generator or utilizing grid-connected power, has inertia response capability, autonomously supports the power grid in the transient change of the power grid frequency, and can effectively improve the frequency stability of a novel power system. The self-synchronous voltage source control mode utilizes the inertia of a direct current bus capacitor to realize autonomous synchronization, and the direct current bus voltage can be mapped to the power grid frequency change so as to be mapped to a machine side control loop to realize the inertia response function without a power grid frequency detection link.
The self-synchronous voltage source inertia response cooperative control mode provided at present only aims at the control of the maximum power tracking stage of the wind turbine generator, and the control method of the low constant rotating speed section, the high constant rotating speed section and the constant power section of the wind turbine generator is not involved. In the three operation intervals, the front end protection control of the wind turbine generator cannot enable the rotation speed of the generator to be lower than or exceed a set amplitude value, the generation power cannot exceed an upper limit, and the current self-synchronous voltage source control mode cannot enable inertia response to be reflected and meanwhile control requirements of constant rotation speed or output power of the wind turbine generator to be met.
Patent document CN113765124a discloses a selective response control system and method for a full wind speed range voltage source type wind turbine generator, comprising: the voltage source control module of the doubly-fed wind turbine generator set: the voltage source control of the doubly-fed wind turbine generator is realized, and the three-phase modulation wave phase angle of the rotor-side converter is output; the voltage source selectivity control judging module: judging whether the wind turbine generator is in a constant-rotation-speed operation stage or not, and judging whether load input or load removal actions occur in the power system or not; wind turbine generator system rotational speed control outer loop: the method comprises the steps of controlling the rotation speed of a wind turbine to be constant when the wind turbine is in a high constant rotation speed stage, a variable pitch stage and a low constant rotation speed stage; the outer ring time constant dynamic correction control module for the rotation speed control: and judging whether the outer ring of the rotating speed control of the wind turbine generator system carries out dynamic correction of the integral time constant or not, and aiming at reducing overshoot of the later period of rotating speed response. However, the method does not solve the problem that the control requirement of constant rotation speed or output power of the wind turbine generator is met while the wind turbine generator meets inertia response.
Disclosure of Invention
Aiming at the defects in the prior art, the application aims to provide a full-wind-speed-section inertia response control system of a voltage source full-power wind turbine generator.
The application provides a full-wind speed section inertia response control system of a voltage source full-power wind turbine generator, which is characterized by comprising the following components:
the system comprises a network side converter control module, a machine side converter control module, a selective inertia response control module and a rotating speed flexible switching control module;
network side converter control module: the grid-side converter is used for controlling the full-power wind turbine generator;
a machine side converter control module: the machine side converter is used for controlling the full-power wind turbine generator;
a selective inertia response control module: the method is used for judging the operation stage of the wind turbine according to the current rotating speed and the output power of the full-power wind turbine, and selecting different inertia influence control methods;
the rotating speed flexible switching control module: the method is used for controlling the rotating speed of the full-power wind turbine generator in the stages of low constant rotating speed, maximum power tracking, high constant rotating speed and variable pitch power limit of the full-power wind turbine generator.
Preferably, the grid-side converter control module is used for stabilizing direct-current voltage and full-power wind turbine generator set port alternating-current voltage.
Preferably, the machine side inverter control module is configured to control torque of the permanent magnet synchronous generator.
Preferably, the grid-side inverter control module inputs a dc voltage set value and a dc voltage detection value, an ac voltage amplitude rating, a three-phase ac voltage detection value and a three-phase ac current detection value, and outputs a driving signal for the grid-side inverter.
Preferably, the machine side converter control module inputs a generator electromagnetic torque set value and a generator electromagnetic torque added value, a direct current voltage detection value, a generator three-phase alternating current detection value, a generator rotation speed detection value and a rotor angle detection value, and outputs a drive signal for the machine side converter.
Preferably, the selective inertia response control module inputs a direct-current voltage detection value and a generator rotating speed detection value, and outputs the direct-current voltage detection value and the generator rotating speed detection value as an additional value of electromagnetic torque of the generator.
Preferably, the rotational speed flexible switching control module is input into a generator rotational speed rated value, a generator rotational speed detection value, a generator rotational speed minimum value, a generator intermediate rotational speed set value and a generator rated power set value, and is output into a generator electromagnetic torque set value.
Preferably, the selective inertia response control module includes:
inertia transfer controller: the power grid frequency change rate of the mirror image of the direct current bus voltage is detected;
and a generator rotating speed judging sub-module: the method is used for judging the current rotating speed of the full-power wind turbine generator;
DC bus voltage detection submodule: the method comprises the steps of detecting the change rate of the voltage of a direct current bus;
selecting a function sub-module: the output of the generator rotating speed judging sub-module and the output of the direct current bus voltage detecting sub-module are operated according to preset logic, and the operation result is used for controlling the output of the multi-way switch of the selective inertia response control module.
Preferably, the selection function sub-module is expressed as a selection function with respect to the dc bus voltage and the generator speed.
Preferably, the rotational speed flexible switching control module includes:
low wind speed segment rotational speed controller: for controlling the generator speed at a given speed in case of low wind speeds;
high wind speed segment rotational speed controller: for controlling the generator speed at a given speed in case of high wind speeds;
a flexible switching controller: the method is used for controlling the full-power wind turbine to realize flexible continuous switching between constant rotating speed control and maximum power tracking control.
Compared with the prior art, the application has the following beneficial effects:
1. in the maximum power tracking stage of the wind turbine, the original inertia response control capability is maintained, namely the wind turbine has the capability of responding to the increase and decrease of the load of the power system; when the wind turbine generator runs in a low wind speed region, namely in a low constant rotation speed section running stage, the wind turbine generator does not respond to the increase of the load of the power system, and only inertia response is carried out when the load of the power system is reduced; when the wind turbine generator is operated in a high wind speed region, namely in a high constant rotation speed operation stage and a constant power operation stage, the wind turbine generator does not respond to the reduction of the load of the power system, and only carries out inertia response when the load of the power system is increased.
2. According to the application, after the inertia response of the wind turbine is carried out in the constant-speed operation stage and the constant-power operation stage, the speed of the wind turbine can be controlled to be slowly recovered, the indifferent control of the speed of the wind turbine is realized, and the phenomenon that the running safety of the wind turbine is influenced due to the generation of speed overshoot is avoided.
3. The application performs seamless switching of inertia influence control methods among the four operation phases of the constant low rotation speed operation phase, the maximum power tracking operation phase, the constant rotation speed operation phase and the constant power operation phase, and eliminates the impact of the inertia response control methods switching of different operation phases on the rotation speed and the power generation power of the unit.
Drawings
Other features, objects and advantages of the present application will become more apparent upon reading of the detailed description of non-limiting embodiments, given with reference to the accompanying drawings in which:
FIG. 1 is a schematic diagram of the structure of the present application;
FIG. 2 is a schematic diagram of a network side inverter control module according to the present application;
FIG. 3 is a schematic diagram of a machine side inverter control module according to the present application;
FIG. 4 is a schematic diagram of a selective inertia response control module of the present application;
fig. 5 is a schematic structural diagram of the rotational speed flexible switching control module of the present application.
Detailed Description
The present application will be described in detail with reference to specific examples. The following examples will assist those skilled in the art in further understanding the present application, but are not intended to limit the application in any way. It should be noted that variations and modifications could be made by those skilled in the art without departing from the inventive concept. These are all within the scope of the present application.
FIG. 1 is a schematic flow chart of the present application, and as shown in FIG. 1, the present application provides a full wind speed section inertia response control system of a voltage source full power wind turbine, comprising: the system comprises a network side converter control module, a machine side converter control module, a selective inertia response control module and a rotating speed flexible switching control module. Wherein the network side converter control module inputs as a DC voltage set point (u dcref ) DC voltage detection value (u) dc ) Ac voltage amplitude rating (u) mref ) Three-phase ac voltage detection value (u cabc ) And a three-phase alternating current detection value (i gabc ) Outputs a driving signal(s) which is a Grid-Side Converter (GSC) gabc ) The method comprises the steps of carrying out a first treatment on the surface of the The machine side converter control module inputs as a generator electromagnetic torque setpoint (T eref ) Additional value of electromagnetic torque of generator (T VC ) DC voltage detection value (u) dc ) Three-phase ac current detection value (i) of generator sabc ) Generator rotation speed detection value (ω) r ) And a rotor angle detection value (θ r ) Outputs a drive signal(s) which is a Machine-Side Converter (MSC) mabc ) The method comprises the steps of carrying out a first treatment on the surface of the The selective inertia response control module inputs as a DC voltage detection value (u dc ) And a generator rotation speed detection value (ω) r ) The output is the added value of the electromagnetic torque of the generator (T VC ) The method comprises the steps of carrying out a first treatment on the surface of the The rotational speed flexible switching control module is input as a generator rotational speed rated value (omega) n ) Generator rotation speed detection value (ω) r ) Minimum value of generator rotation speed (ω) min ) And generator intermediate speed set point (omega) mid ) And the rated power set point (P) of the generator n ) Output is the set value (T) of the electromagnetic torque of the generator eref ) P in FIG. 1 m Representing the output power of the side converter, P g Representing the output power of the network-side converter, e.g. representing the filter inductance, C f Represents the filter capacitance L g Representing the grid-side inductance,representing the grid voltage amplitude, PMSG represents a permanent magnet synchronous generator (Permanent Magnet Synchronous Generator).
Network side converter control module: the grid-side converter is used for controlling the full-power wind turbine generator.
The grid-side converter control module is used for stabilizing direct-current voltage and full-power wind turbine generator set port alternating-current voltage.
Preferably, the network side inverter control module inputs as a dc voltage set point (u dcref ) And a DC voltage detection value (u dc ) Ac voltage amplitude rating (u) mref ) Three-phase ac voltage detection value (u cabc ) And a three-phase alternating current detection value (i gabc ) The output is the net sideDriving signal(s) of inverter gabc )。
Specifically, the driving signal (s gabc ) The method is used for controlling the grid-side converter of the full-power wind turbine.
Fig. 2 is a schematic structural diagram of a grid-side converter control module according to the present application, as shown in fig. 2, where the grid-side converter control module is configured to implement autonomous synchronization of a full-power wind turbine grid-side converter and a power grid, where P g Output power of a network side converter (GSC), u dcref Voltage command value corresponding to DC capacitor in network side converter control module, u dc Voltage actual value corresponding to DC capacitor in network side converter control module, u mref Command value corresponding to output voltage of network side converter in network side converter control module, u m In the network-side converter control module, u corresponds to the actual value of the output voltage of the network-side converter t0 Represents the nominal modulation voltage omega 0 Indicating the rated angular frequency of the network, u cabc And i gabc Respectively corresponding to the three-phase alternating voltage and the three-phase alternating current output by the grid-side converter GSC, s gabc A trigger pulse signal representing the network side converter. u (u) dcref And u is equal to dc After the difference is made, the transfer function is H dc After the direct-current voltage controller, the synchronous power required by the grid-side converter GSC is output, and the synchronous power and GSC output power P g After difference, the transfer function is H jd The output value of the synchronous power control link is the frequency difference; frequency difference and omega 0 Added by transfer function H w And (3) a synchronous angle generating link of the grid-side converter and the power grid is obtained. u (u) mref And u is equal to m After the difference is made, the transfer function is H q After the modulation voltage control link, outputting the modulation voltage compensation component of the grid-side converter GSC, and the modulation voltage compensation component and u t0 Added and multiplied by a voltage reference value U b Obtaining the actual modulation voltage amplitude U of the grid-side converter t The method comprises the steps of carrying out a first treatment on the surface of the According to the actual modulation voltage amplitude U t Generating a modulation voltage u of the grid-side converter with a synchronization angle θ a 、u b U c Modulating the voltage u a 、u b U c The pulse width modulation (Pulse Width Modulation, PWM) module is used for inputting, comparing with the triangular wave, if the amplitude of the modulated wave is larger than that of the triangular wave, outputting a signal '1', and triggering the GSC on; if the amplitude of the modulated wave is smaller than that of the triangular wave, outputting a signal '0', locking a GSC trigger pulse of the network side converter, realizing sine pulse width modulation, and generating a pulse signal s gabc 。
Wherein u is cabc And i gabc Obtaining output power P of network side converter (GSC) through power calculation g ；u cabc Tracking the power grid voltage through a Phase-Lock Loop (PLL) and detecting the power grid voltage to obtain a voltage amplitude u m 。
A machine side converter control module: and the machine side converter is used for controlling the full-power wind turbine generator.
The machine side converter control module is used for controlling the torque of the permanent magnet synchronous generator.
Preferably, the machine side inverter control module inputs a command value (T eref ) And the added value of the electromagnetic torque of the generator (T VC ) DC voltage detection value (u) dc ) Three-phase ac current detection value (i) of generator sabc ) Generator rotation speed detection value (ω) r ) And a rotor angle detection value (θ r ) Output as a drive signal(s) of the side converter mabc )。
Specifically, the driving signal(s) of the side converter outputted by the side converter control module mabc ) And the machine side converter is used for controlling the full-power wind turbine generator.
FIG. 3 is a schematic diagram of a machine side converter control module according to the present application, as shown in FIG. 3, for implementing vector control of a machine side converter of a full power wind turbine, wherein ω m Represents the electrical angle, theta, of the rotor of the generator r Representing the rotor position angle of a permanent magnet synchronous generator, PMSG representing the permanent magnet synchronous generator, MSC representing the machine side converter, i sd And i sq Respectively representing the sum of d-axis components of current flowing into the side converter of PMSGq-axis component, u mcd And u is equal to mcq Corresponding to decoupling terms s in current inner loops of d axis and q axis of the current transformer respectively mabc Representing the trigger pulse signal of the side converter. Vector control architecture employing rotor flux linkage orientation, i.e. controlling d-axis current component i sdref =0 so that the rotor flux coincides with the rotational coordinate system d-axis so that the active power of the machine side converter MSC is only identical to the q-axis current i sq Related to the following. Since the torque component in per unit value system is equivalent to the q-axis current component, the machine side converter controls the output component T of the outer ring, i.e., the rotational speed control loop eref Superimposed on the inertia transfer torque component T VC Then multiplying the torque by a conversion coefficient K of the torque to the current e The q-axis current reference value i of the current inner loop can be obtained sqref ，i sqref With q-axis current feedback value i sq The difference is input into a PI regulator of a current loop, and then the PI regulator is used as a q-axis voltage modulation signal u through a cross decoupling link mq . D-axis current reference i sdref With d-axis current feedback value i sd The difference is input into a PI regulator of the current inner loop, and then the PI regulator is used as a d-axis voltage modulation signal u through a cross decoupling link md . Subsequently, u mq And u md And theta r Generating a corresponding modulation voltage u under a three-phase static coordinate system through a dq-abc coordinate transformation module ma 、u mb U mc Input PWM module, where θ r For the angle required by the coordinate transformation, the corresponding voltage u ma Is a phase angle of (2); u (u) ma 、u mb U mc Comparing the amplitude of the modulated wave with the amplitude of the triangular wave, outputting a signal '1' if the amplitude of the modulated wave is larger than the amplitude of the triangular wave, and triggering the MSC of the side converter to be conducted; if the amplitude of the modulated wave is smaller than that of the triangular wave, a signal '0' is output, and the blocking machine side converter MSC triggers a pulse, so that sine pulse width modulation is realized, and the generated pulse signal is s mabc 。
It can be seen that T VC For inertia transfer control components, fig. 2 and fig. 3 together form a basic control link of the full-power wind turbine generator.
A selective inertia response control module: the method is used for judging the operation stage of the wind turbine according to the current rotating speed and the output power of the full-power wind turbine, and selecting different inertia influence control methods.
Preferably, the selective inertia response control module inputs are a DC voltage detection value (u dc ) And a generator rotation speed detection value (ω) r ) The output is the added value of the electromagnetic torque of the generator (T VC )。
Specifically, when the rotation speed is equal to the lowest rotation speed, the low constant rotation speed operation stage is adopted; the rotating speed is higher than the lowest rotating speed and is in the stage of maximum power tracking (Maximum Power Point Tracking, MPPT) when the rotating speed is lower than the rated rotating speed; the rotating speed is equal to the rated rotating speed, and when the output power is smaller than the rated power, the constant high rotating speed operation stage is carried out; the rotating speed is equal to the rated rotating speed, and the constant power pitch stage is adopted when the output power is equal to the rated power. And judging the load reduction or increase action in the power system according to the decrease or increase of the direct current bus voltage, so as to determine whether the wind turbine generator set performs inertia response. The wind turbine generator in the constant low rotation speed stage only responds to the rising of the power grid frequency, the wind turbine generator in the MPPT stage responds to the rising and falling of the power grid frequency, and the wind turbine generator in the constant high rotation speed and constant power pitch stage only responds to the falling of the power grid frequency. The selective inertia response control module selects the output inertia transfer component to be 0 or an actual value through judging the running interval of the wind turbine generator, then inputs the additional item of the current inner loop in the machine side converter control module in the self-synchronous voltage source control module of the full-power wind turbine generator, introduces the change rate of the direct-current bus voltage as a torque component into the control loop, correspondingly changes the active power output by the wind turbine generator when the power grid frequency changes, extracts the kinetic energy of a rotor, and realizes selective inertia response.
Preferably, the selective inertia response control module includes: inertia transfer controller: the power grid frequency change rate of the mirror image of the direct current bus voltage is detected; and a generator rotating speed judging sub-module: the method is used for judging the current rotating speed of the full-power wind turbine generator; DC bus voltage detection submodule: the method comprises the steps of detecting the change rate of the voltage of a direct current bus; selecting a function sub-module: the output of the generator rotating speed judging sub-module and the output of the direct current bus voltage detecting sub-module are operated according to preset logic, and the operation result is used for controlling the output of the multi-way switch of the selective inertia response control module.
Wherein the selection function sub-module is represented as a selection function with respect to the dc bus voltage and the generator speed.
FIG. 4 is a schematic structural diagram of a selective inertia response control module of the present application, as shown in FIG. 4, the selective inertia response control module includes: inertia transfer controller: for detecting the rate of change of the frequency of the power network mirrored by the DC bus voltage, where K C Representing an inertia transfer coefficient, s representing a differential controller, 1/(ts+1) representing a first-order filtering link, and T representing a filtering time constant. Will u dc After the differentiation step s, the mixture passes through a first-order low-pass filter with a time constant of T and then passes through a gain of-K C Generating an additional torque component T after the differentiation of the segments VM As a virtual inertia. When the virtual inertia is switched on and off in the load of the power system, the speed of the impeller of the wind turbine is controlled to be increased or decreased by changing the electromagnetic torque, the kinetic energy of the rotor is absorbed or released to feed back to the power grid, and the frequency of the power grid is supported to be recovered; an engine rotation speed judging sub-module: used for judging the current rotating speed omega of the wind turbine generator r Equal to the minimum rotational speed omega min When the wind turbine generator is in a constant low-speed running stage; omega r At omega min Rated rotational speed omega n The phase is the maximum power tracking phase; omega r Equal to the minimum rotational speed omega min When the pitch angle beta=0, the wind turbine generator is in a constant high-speed running stage; omega r Equal to the minimum rotational speed omega min And when beta is more than 0, the wind turbine generator is in a constant high-speed running stage. When the wind turbine generator is in the constant low rotation speed section, the constant high rotation speed section and the constant power variable pitch section, the engine rotation speed judging submodule outputs S I1 =0; when the wind turbine generator is in the maximum power tracking stage, the engine speed judging submodule outputs S I1 =1; DC bus voltage detection submodule: for detecting the DC bus voltage u dc Because the direct current bus voltage in the self-synchronous voltage source control method can map the frequency change of the power system in real time, the direct current bus voltage detection submodule does not need an additional frequency detection device to detect the frequency of the power gridAnd (3) a change. When the signal output by the DC bus voltage sampling device is reduced in a steady state, outputting S I2 =1, the remaining cases output S I2 =0; selecting a function sub-module: the selection function submodule may be denoted as S VC (w r ，u dc ) For determining the output S of the generator speed determination sub-module as a selection function of the DC bus voltage and the generator speed I1 Output S of DC bus voltage detection sub-module I2 Performing operation according to preset logic, and calculating result S IO And the output of the multi-way switch is used for controlling the selective inertia response control module. The set logic operation of the selection function module is as follows: when the power grid frequency rises, if the wind turbine generator is in a low constant rotation speed stage and a maximum power tracking stage, outputting S IO =1; if the wind turbine generator is in the high constant rotation speed stage and the constant power pitch stage, outputting S IO =0. When the power grid frequency is reduced, if the wind turbine is in a maximum power tracking stage, a high constant rotating speed stage and a constant power pitch stage, outputting S IO =1; if the wind turbine generator is in the low constant rotation speed stage, outputting S IO =0. When S is IO When=0, the output T of the multi-way switch of the inertia response control module VC =0; when S is at IO When=1, the output T of the multi-way switch of the inertia response control module VC ＝T VM 。
It can be known that the selective inertia response control module of fig. 4 includes a detection link for the current running speed state of the wind turbine and the dc bus voltage, and a selective logic function link and a gating switch for combining the two links to perform the following steps according to S VC (ω r ，u dc ) Output value selection of inertia transfer torque component T VC Whether 0, and then added to the q-axis loop of the machine side converter control module.
The rotating speed flexible switching control module: the method is used for controlling the rotating speed of the full-power wind turbine generator in the stages of low constant rotating speed, maximum power tracking, high constant rotating speed and variable pitch power limit of the full-power wind turbine generator.
Preferably, the rotational speed flexible switching control module input is the rotational speed of the generatorRating (omega) n ) Generator rotation speed detection value (ω) r ) Minimum value of generator rotation speed (ω) min ) Set value of generator intermediate rotation speed (omega) mid ) And the rated power set point (P) of the generator n ) Output is the set value (T) of the electromagnetic torque of the generator eref )。
Preferably, the rotational speed flexible switching control module includes: low wind speed segment rotational speed controller: for controlling the generator speed at a given speed in case of low wind speeds; high wind speed segment rotational speed controller: for controlling the generator speed at a given speed in case of high wind speeds; a flexible switching controller: the method is used for controlling the full-power wind turbine to realize flexible continuous switching between constant rotating speed control and maximum power tracking control.
Fig. 5 is a schematic structural diagram of a rotational speed flexible switching control module according to the present application, as shown in fig. 5, the rotational speed flexible switching control module includes: low wind speed segment rotational speed controller: for controlling the generator speed at a given speed at low wind speeds, the speed reference being the minimum speed omega min Which is in accordance with the actual rotational speed omega r The difference is input into a PI controller, the lower amplitude limit is 0, and the upper amplitude limit is 0Wherein k is opt Representing the optimal wind power tracking coefficient. When the current rotation speed omega r Below omega min The PI regulator output is limited to 0, i.e., disabled; when omega r Higher than omega min The PI regulator starts to act, and the rotating speed is controlled to be the lowest rotating speed in a saturation range; when the wind speed is continuously increased, omega r Higher than omega min Excessive, the PI regulator output saturates, the output torque command is limited to +.>I.e. maximum power tracking. The output result is the machine side q-axis current (torque component T) e ) Torque given command T of control loop eref The method comprises the steps of carrying out a first treatment on the surface of the High wind speed segment rotational speed controller: for controlling the generation of electricity in high wind conditionsThe engine speed is controlled at a given speed, and the speed reference value is the rated speed omega n Which is in accordance with the actual rotational speed omega r The difference is input into a PI controller, and the controller outputs a lower clip>Upper limiter to maximum torque value T max . Wherein T is max From rated power P n Divided by the current rotational speed omega r Obtained. When the current rotation speed omega r Below omega n The PI regulator output is limited to +.>Namely, keeping maximum power tracking when the rotating speed is not up to the upper limit; when omega r Higher than omega min The PI regulator starts to act, and the rotating speed is controlled to be the rated rotating speed in the saturation range; when the wind speed is continuously increased, omega r Higher than omega n Too much, at this point the PI regulator output is saturated, the output torque command is limited to T max I.e. the torque command value output at that time is such that the unit output power does not exceed the rated power P n And the wind turbine generator enters a constant power operation mode. The output result is the machine side q-axis current (torque component T) VC ) Torque-given command T for controlling an inner ring eref The method comprises the steps of carrying out a first treatment on the surface of the A flexible switching controller: the method is used for controlling the wind turbine to realize flexible continuous switching between constant rotating speed control and maximum power tracking control. When the actual rotation speed omega r Less than the intermediate rotation speed omega mid When the output of the flexible switching controller is 0, the output of the rotating speed flexible switching control module is selected as the output value of the rotating speed controller in the low wind speed section; when the actual rotation speed omega r Higher than the intermediate rotation speed omega mid And when the output of the flexible switching controller is 1, the output of the rotating speed flexible switching control module is selected as the output value of the rotating speed controller in the high wind speed section. Intermediate rotational speed ω at switching time mid In the maximum wind power tracking stage of the corresponding wind turbine generator, the low wind speed section rotating speed controller and the high wind speed section rotating speed controller are in a saturated state at the moment, and the output is thatTherefore, the output values of the two control loops are equal, and no step change exists, so that the impact-free flexible switching of different operation stages can be realized.
It can be known that the flexible switching speed controller in fig. 5 can realize natural switching of the wind turbine generator set at different wind speeds by setting two loop speed reference commands and adjusting the upper and lower limits of output of the PI regulator in real time, and the output is a torque loop in the machine side converter control module, namely q-axis current i sq Or torque value T e Provides a reference instruction T eref 。
Specifically, the full-wind-speed-section inertia response control system of the voltage source full-power wind turbine generator provided by the application can automatically switch the control loop according to the wind speed interval, maintain the stable rotating speed, provide different inertia responses for the changes of the power grid frequency in different directions, and improve the intelligence and the practicability.
The application solves the technical problems that:
the existing self-synchronous voltage source inertia response cooperative control mode is only aimed at the control of the maximum power tracking stage of the wind turbine generator, and does not relate to a control method of a low constant rotation speed section, a high constant rotation speed section and a constant power section of the wind turbine generator. In the three operation intervals of the low constant rotation speed section, the high constant rotation speed section and the constant power section, the front end protection control of the wind turbine cannot enable the rotation speed of the generator to be lower than or exceed a set amplitude value, the generation power cannot exceed an upper limit, and the current self-synchronous voltage source control mode cannot enable inertia response to be reflected and meanwhile meet the control requirement of constant rotation speed or output power of the wind turbine.
Compared with the prior art, the application has the following beneficial effects:
1. the method and the device realize the control of the selective inertia response of the full-power wind turbine generator by the self-synchronous voltage source in the full wind speed range.
2. In the maximum power tracking stage of the full-power wind turbine, the inertia response control mode of the original self-synchronous voltage source is maintained, and the wind turbine has the capabilities of absorbing active power and releasing active power.
3. When the wind speed is low, the wind turbine generator is in a low constant rotation speed operation stage, and the wind turbine generator is only controlled to participate in inertia response when the load of the power system is reduced, so that the effect of protecting the rotation speed of the wind turbine generator from exceeding the lower limit is achieved. Namely: the wind turbine generator system only has the capability of absorbing active power and increasing the rotating speed.
4. In the low constant rotation speed stage, the rotation speed of the wind turbine generator is controlled to slowly decrease after rising in the process of participating in inertia response, and finally, the indifferent control between rotation speed setting is realized, so that the phenomenon that the safe operation of the wind turbine generator is influenced by overshoot is avoided.
5. When the wind speed is high, the wind turbine generator is in a high constant-speed running stage and a variable-pitch running stage, and the wind turbine generator is controlled to participate in inertia response only when the load of the power system is increased, so that the wind turbine generator has the effect of protecting the wind turbine generator. Namely: the wind turbine generator system only has the capability of releasing active power and reducing rotating speed.
6. In the high constant rotation speed stage, the rotation speed of the wind turbine generator is controlled to slowly rise after the rotation speed is reduced in the process of participating in inertia response of the wind turbine generator, and finally, the indifferent control between the rotation speed setting and the rotation speed setting is realized, so that the phenomenon that the safe operation of the wind turbine generator is influenced by overshoot is avoided.
Those skilled in the art will appreciate that, in addition to implementing the systems, apparatuses, and their respective modules provided by the present application in a pure computer readable program code manner, the same program can be implemented entirely by logically programming a method submodule M to cause the systems, apparatuses, and their respective modules to be implemented in the form of logic gates, switches, application specific integrated circuits, programmable logic controllers, embedded microcontrollers, etc. Therefore, the system, the apparatus, and the respective modules thereof provided by the present application may be regarded as one hardware component, and the modules included therein for implementing various programs may also be regarded as structures within the hardware component; modules for implementing various functions may also be regarded as being either software programs for implementing the methods or structures within hardware components.
The foregoing describes specific embodiments of the present application. It is to be understood that the application is not limited to the particular embodiments described above, and that various changes or modifications may be made by those skilled in the art within the scope of the appended claims without affecting the spirit of the application. The embodiments of the application and the features of the embodiments may be combined with each other arbitrarily without conflict.
Claims (10)
1. The utility model provides a full wind speed section inertia response control system of voltage source full power wind turbine generator system which characterized in that includes:
the system comprises a network side converter control module, a machine side converter control module, a selective inertia response control module and a rotating speed flexible switching control module;
network side converter control module: the grid-side converter is used for controlling the full-power wind turbine generator;
a machine side converter control module: the machine side converter is used for controlling the full-power wind turbine generator;
a selective inertia response control module: the method is used for judging the operation stage of the wind turbine according to the current rotating speed and the output power of the full-power wind turbine, and selecting different inertia influence control methods;
the rotating speed flexible switching control module: the method is used for controlling the rotating speed of the full-power wind turbine generator in the stages of low constant rotating speed, maximum power tracking, high constant rotating speed and variable pitch power limit of the full-power wind turbine generator.
2. The full-wind-speed-section inertia response control system of the voltage source full-power wind turbine of claim 1, wherein the grid-side converter control module is configured to stabilize a direct current voltage and a full-power wind turbine port alternating current voltage.
3. The full-wind-speed segment inertia response control system of a voltage source full-power wind turbine of claim 1, wherein the machine side converter control module is configured to control torque of the permanent magnet synchronous generator.
4. The full-wind-speed-section inertia response control system of the voltage source full-power wind turbine generator of claim 1, wherein the grid-side converter control module inputs a direct-current voltage set value and a direct-current voltage detection value, an alternating-current voltage amplitude rated value, a three-phase alternating-current voltage detection value and a three-phase alternating-current detection value, and outputs a driving signal of the grid-side converter.
5. The full-wind-speed-section inertia response control system of the voltage source full-power wind turbine of claim 1, wherein the machine-side converter control module inputs a set value of the electromagnetic torque of the generator and an added value of the electromagnetic torque of the generator, a detection value of the direct-current voltage, a detection value of the three-phase alternating-current of the generator, a detection value of the rotation speed of the generator and a detection value of the angle of the rotor, and outputs a driving signal of the machine-side converter.
6. The full-wind-speed-section inertia response control system of the voltage source full-power wind turbine generator of claim 1, wherein the input of the selective inertia response control module is a direct-current voltage detection value and a generator rotation speed detection value, and the output is an electromagnetic torque added value of the generator.
7. The full-wind-speed-section inertia response control system of the voltage source full-power wind turbine generator according to claim 1, wherein the rotational speed flexible switching control module inputs a generator rotational speed rated value, a generator rotational speed detection value, a generator rotational speed minimum value, a generator intermediate rotational speed set value and a generator rated power set value, and outputs the set value as a generator electromagnetic torque set value.
8. The full wind speed segment inertia response control system of a voltage source full power wind turbine of claim 1 or 6, wherein the selective inertia response control module comprises:
inertia transfer controller: the power grid frequency change rate of the mirror image of the direct current bus voltage is detected;
and a generator rotating speed judging sub-module: the method is used for judging the current rotating speed of the full-power wind turbine generator;
DC bus voltage detection submodule: the method comprises the steps of detecting the change rate of the voltage of a direct current bus;
selecting a function sub-module: the output of the generator rotating speed judging sub-module and the output of the direct current bus voltage detecting sub-module are operated according to preset logic, and the operation result is used for controlling the output of the multi-way switch of the selective inertia response control module.
9. The full wind speed segment inertia response control system of a voltage source full power wind turbine of claim 8, wherein the selection function sub-module is represented as a selection function with respect to dc bus voltage and generator speed.
10. The full-wind-speed-section inertia response control system of the voltage source full-power wind turbine of claim 1, wherein the rotational speed flexible switching control module comprises:
low wind speed segment rotational speed controller: for controlling the generator speed at a given speed in case of low wind speeds;
high wind speed segment rotational speed controller: for controlling the generator speed at a given speed in case of high wind speeds;
a flexible switching controller: the method is used for controlling the full-power wind turbine to realize flexible continuous switching between constant rotating speed control and maximum power tracking control.
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN117096921A (en) * | 2023-10-17 | 2023-11-21 | 国网湖北省电力有限公司 | Control system and method for net-structured wind turbine generator with additional energy storage |
| CN117578632A (en) * | 2023-11-20 | 2024-02-20 | 南京工业职业技术大学 | Double-fed voltage source wind turbine generator system rotation speed-inertia combination control method |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN117096921A (en) * | 2023-10-17 | 2023-11-21 | 国网湖北省电力有限公司 | Control system and method for net-structured wind turbine generator with additional energy storage |
| CN117096921B (en) * | 2023-10-17 | 2024-01-12 | 国网湖北省电力有限公司 | Control system and method for net-structured wind turbine generator with additional energy storage |
| CN117578632A (en) * | 2023-11-20 | 2024-02-20 | 南京工业职业技术大学 | Double-fed voltage source wind turbine generator system rotation speed-inertia combination control method |
| CN117578632B (en) * | 2023-11-20 | 2024-06-07 | 南京工业职业技术大学 | Double-fed voltage source wind turbine generator system rotation speed-inertia combination control method |
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