CN103969578A - Device and method for testing power grid adaptability of wind power generating unit - Google Patents
Device and method for testing power grid adaptability of wind power generating unit Download PDFInfo
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Abstract
A device for testing power grid adaptability of a wind power generating unit comprises two modularized multi-level current converters in back connection, a disturbance generating module and a direct-current-charging starting module. The disturbance generating module comprises a software signal generating unit used for generating disturbance control signals and a control unit used for executing the control signals to generate disturbance signals, and the disturbance generating module is connected with the modularized multi-level current converter connected with a 35KV bus of the wind power generating unit. The device has the advantages that flexible simulation of various disturbances like voltage fluctuation, frequency hopping, voltage harmonic or three-phase unbalance and flickering of the wind power generating unit under a grid-connected voltage level; the modularized multi-level current converters are adopted, a transformer is not needed, and the device can be directly connected in a power grid, at a 35KV grid-connected voltage level, of a current wind power generating unit.
Description
Technical field
The networking detection technique field that the invention belongs to wind power generating set access electric system, is specifically related to a kind of megawatt-level wind unit grid adaptability proving installation and method of testing based on modularization multi-level converter.
Background technology
At present, the proportion of Wind Power In China in electrical network improves constantly, and by disperseing, on a small scale exploitation, on-site elimination be progressively to extensive, high exploitation, remote, the high voltage power network developer conveying direction concentrated.For the grid-connected work of specification wind energy turbine set, promote wind-powered electricity generation science sustainable health development, guarantee wind energy turbine set and power network safety operation, State Grid Corporation of China has put into effect " State Grid Corporation of China's wind energy turbine set access electric power network technique regulation ".Aspect wind energy turbine set operation adaptability, the clear and definite operating provisions of wind energy turbine set in the grid-connected point voltage scope of difference, frequency range; Aspect the wind energy turbine set quality of power supply, the clear and definite specific requirement of wind energy turbine set to voltage deviation, flickering, harmonic wave etc.That is to say, in the time of electrical network generation voltage fluctuation, frequency hopping, voltage harmonic or the various disturbance such as three-phase imbalance, flickering, the wind-powered electricity generation unit being incorporated into the power networks must possess good electrical network adaptive faculty.Therefore, operation adaptability and the Power Quality Detection of wind-powered electricity generation unit are very important.At present, China has possessed the detection means of low voltage ride-through capability of wind turbine generator system, but whether can stand the detectability of various disturbances of electrical network for wind-powered electricity generation unit also a little less than relative thin, be necessary the dynamic perfromance in conjunction with wind-powered electricity generation unit, guaranteeing under the prerequisite that original electric power system is not impacted, proposing a kind of wind-powered electricity generation unit grid adaptability proving installation being adapted under current wind energy turbine set line voltage grade.
Chinese scholars is being carried out relevant research aspect controllable voltage disturbing generating device, but does not further investigate in conjunction with application scenario and the correlation technique difficult point of wind energy turbine set reality.Learn according to patent retrieval, China's invention 201010234259.4 provides a kind of wind-powered electricity generation unit is carried out network access testing and Large Scale Wind Farm Integration is incorporated into the power networks and detects the disturbing generating device of evaluating.This disturbing generating device produces the various voltages for the test of wind-powered electricity generation unit, formed by low-frequency voltage disturbance device and HF voltage disturbance device, low-frequency voltage disturbance device is made up of starting resistance, step-down transformer, wave filter, shunt voltage source current changer module and step-up transformer, realizes the function of low-frequency voltage disturbance; HF voltage disturbance device is made up of starting resistance, rectifier transformer, PWM rectifier module, Cascade H bridge module and wave filter, realizes output 2～25 subharmonic voltage functions.The advantage of its invention is to realize the multiple disturbances such as voltage fluctuation, frequency jitter, voltage distortion and imbalance of three-phase voltage, and every phase voltage can be adjusted respectively, meets the switching requirement of wind-powered electricity generation unit between electronic and generating state.But there is complex structure, expensive, the large shortcoming of control difficulty in this device, easy phase mutual interference when low-frequency voltage disturbance and the series operation of HF voltage disturbance device, controls effect and be easily affected.
Summary of the invention
The object of the invention is for solve existing wind-powered electricity generation unit grid adaptability proving installation adopt the low-frequency voltage disturbance device of series connection and HF voltage disturbance device complex structure, expensive, control the deficiencies such as the large and easy phase mutual interference of difficulty, a kind of wind-powered electricity generation unit grid adaptability proving installation and the wind-powered electricity generation unit grid adaptability method of testing based on described device have been proposed.
Technical scheme of the present invention is: wind-powered electricity generation unit grid adaptability proving installation, it is characterized in that, comprise two modularization multi-level converters that connect dorsad, one of multilevel converter be connected with wind-powered electricity generation unit 35KV bus, another multilevel converter connection electrical network 35KV bus; Device also comprises that disturbance generation module and DC charging start module, described disturbance generation module comprises that described disturbance generation module is connected with the modularization multi-level converter that is connected wind-powered electricity generation unit 35KV bus for generation of the control module of the software signal generating unit of disturbance control signal and execution control signal generation disturbing signal; Described DC charging starts module and is connected between the multilevel converter and electrical network 35KV bus being connected with wind-powered electricity generation unit 35KV bus, for starting the multilevel converter being connected with wind-powered electricity generation unit 35KV bus.
Further, described software signal generating unit comprises for the MATLAB programming unit of simulation wind energy turbine set disturbance control signal, the control signal output unit for storing the case thesaurus of described control signal and being connected with control module of programming.
Further, described control signal comprises one or more disturbance control signals in wind energy turbine set voltage fluctuation, frequency hopping, voltage harmonic, three-phase imbalance and flickering.
Further, described device also comprises the first isolating switch that connects and disconnect for controlling tested wind-powered electricity generation unit, for level and smooth the second isolating switch starting of control disturbance generation module direct current.
The method of testing of utilizing above-mentioned wind-powered electricity generation unit grid adaptability proving installation, is characterized in that, comprises the following steps:
In S1, use MATLAB programming unit, wind energy turbine set operational system realistic model is built by simulation software, the voltage disturbance mode of simulation wind energy turbine set, described disturbance comprises one or more in voltage fluctuation, frequency jitter, three-phase imbalance, three phase distortions and voltage flicker, generate the three-phase disturbance voltage U ref of wind-powered electricity generation unit 35kV site, and deposit the voltage disturbance curve of described perturbation scheme in case thesaurus;
S2, by between two modularization multi-level converters accesses electrical network 35kV buses that connect dorsad and wind-powered electricity generation unit 35kV bus to be tested;
S3, startup modularization multi-level converter: use electrical network 35KV busbar voltage to start two modularization multi-level converters that connect dorsad, the modularization multi-level converter being wherein connected with wind-powered electricity generation unit 35kV bus starts module by DC charging and starts;
The high-frequency rectification of S4, control electrical network 35KV bus bar side multilevel converter, make the capacitance voltage of each submodule be adjusted into designated value, control and follow the tracks of wind-powered electricity generation unit side multilevel converter voltage, realize multilevel converter wind-powered electricity generation unit side output voltage and disturbance voltage command signal U
reftracking control.
Further, in step S1, use simulation software in MATLAB programming unit to build wind energy turbine set operational system realistic model, realize and to the process of wind energy turbine set voltage disturbance emulation be: the SIMULINK module based on MATLAB simulation software is built the realistic model of wind energy turbine set operational system, this model is by the equivalent infinitely great power supply of AC network, alternating current circuit and wind-powered electricity generation unit composition, on different circuits or bus, arrange single-phase, two-phase unbalanced fault or three-phase shortcircuit earth fault, simulating grid voltage falls, three-phase imbalance, three phase distortions and voltage flicker voltage disturbance, generate the three-phase disturbance voltage command signal U of wind-powered electricity generation set grid-connection point
ref, described voltage disturbance curve classification is deposited in case thesaurus simultaneously, reuse for noisy data.
Beneficial effect of the present invention: wind-powered electricity generation unit grid adaptability proving installation of the present invention, adopt the mode of MATLAB programmable simulation, can comprise that voltage fluctuation, frequency hopping, voltage harmonic or three-phase imbalance, flickering etc. simulate neatly to the various disturbances under wind-powered electricity generation set grid-connection electric pressure.Meanwhile, this device adopts modular multilevel converter structure, without transformer, directly in the electrical network of the grid-connected electric pressure of 35kV of the current wind-powered electricity generation unit of series connection access.In view of modularization multi-level converter has used comparatively ripe in straight-flow system, therefore can meet the diversity of apparatus function completely and control dirigibility, reach the requirement of wind-powered electricity generation unit dynamic characteristic test in electronic and the various disturbance situations of generating state, and grid-connected electric system is not caused to larger impact and impact.And can freely select voltage disturbance form by human-computer interaction interface, detect targetedly operation adaptability and the quality of power supply index of correlation of wind-powered electricity generation unit; This device series connection, between tested wind-powered electricity generation unit bus bar side and AC network, has realized the isolation completely of wind-powered electricity generation unit side and grid side, and the fault of wind-powered electricity generation unit side can not affect the normal operation of AC network like this.
Brief description of the drawings
Fig. 1 is wind-powered electricity generation unit grid adaptability proving installation and the control block diagram schematic diagram thereof based on modularization multi-level converter.
Fig. 2 is each submodule DC capacitor voltage oscillogram in the grid side multilevel converter of proving installation.
Fig. 3 is that grid side multilevel converter AC A, B, the C three-phase of proving installation exported many level oscillogram.
Fig. 4 is oscillogram when single-phase fault-A phase voltage drops to 20% ratings in the embodiment of the present invention.
Fig. 5 is oscillogram when three-phase fault-three-phase voltage all drops to 20% ratings in the embodiment of the present invention.
Oscillogram when Fig. 6 is the negative sequence voltage component of imbalance of three-phase voltage-injection 20% in the embodiment of the present invention.
Fig. 7 is that in the embodiment of the present invention, three-phase injects and oscillogram when 5% 7 subharmonic voltage component 5% for 5 times.
Fig. 8 is the oscillogram of three-phase when to inject 1% frequency be the component of voltage of 8.8Hz in the embodiment of the present invention.
Embodiment
Following examples of the present invention are implemented as prerequisite taking technical solution of the present invention, provided detailed embodiment and concrete operating process, but protection scope of the present invention are not limited to following embodiment.
As shown in Figure 1, the wind-powered electricity generation unit grid adaptability proving installation of the present embodiment, comprises two modularization multi-level converters that connect dorsad, one of multilevel converter be connected with wind-powered electricity generation unit 35KV bus, another multilevel converter connection electrical network 35KV bus; Device also comprises that disturbance generation module and DC charging start module, described disturbance generation module comprises that described disturbance generation module is connected with the modularization multi-level converter that is connected wind-powered electricity generation unit 35KV bus for generation of the control module of the software signal generating unit of disturbance control signal and execution control signal generation disturbing signal; Described DC charging starts module and is connected between the multilevel converter and electrical network 35KV bus being connected with wind-powered electricity generation unit 35KV bus, for starting the multilevel converter being connected with wind-powered electricity generation unit 35KV bus.Software signal generating unit is wherein by the MATLAB programming unit for the simulation wind energy turbine set disturbance control signal of programming, form for the control signal output unit of storing the case thesaurus of described control signal and be connected with control module.
In the present embodiment, the control signal being produced by MATLAB programming unit comprises one or more disturbance control signals in wind energy turbine set voltage fluctuation, frequency hopping, voltage harmonic, three-phase imbalance and flickering.For the ease of the control of test process, improve testing efficiency, in the present embodiment, device also comprises the first isolating switch that connects and disconnect for controlling tested wind-powered electricity generation unit, for level and smooth the second isolating switch starting of control disturbance generation module direct current.
A kind of method of testing of utilizing above-mentioned wind-powered electricity generation unit grid adaptability proving installation that the present embodiment provides, comprises the following steps:
In S1, use MATLAB programming unit, wind energy turbine set operational system realistic model is built by simulation software, the voltage disturbance mode of simulation wind energy turbine set, described disturbance comprises one or more in voltage fluctuation, frequency jitter, three-phase imbalance, three phase distortions and voltage flicker, generate the three-phase disturbance voltage U ref of wind-powered electricity generation unit 35kV site, and deposit the voltage disturbance curve of described perturbation scheme in case thesaurus.Its detailed process is: the SIMULINK module based on MATLAB simulation software is built the realistic model of wind energy turbine set operational system, this model is made up of the equivalent infinitely great power supply of AC network, alternating current circuit and wind-powered electricity generation unit, single-phase, two-phase unbalanced fault or three-phase shortcircuit earth fault are set on different circuits or bus, simulating grid voltage falls, three-phase imbalance, three phase distortions and voltage flicker voltage disturbance, generates the three-phase disturbance voltage command signal U of wind-powered electricity generation set grid-connection point
ref; Described voltage disturbance curve classification is deposited in case thesaurus simultaneously, reuse for noisy data.Utilize device or the method for the present embodiment, also can be according to the actual demand in on-the-spot test process, by the various types of failure modes of MATLAB analogue simulation and generate new disturbance voltage U
ref.
Typical wind energy turbine set operational system topological structure is built by the above-mentioned MATLAB of utilization simulation software, realize the various voltage disturbance emulation of wind energy turbine set, comprehensive for test result, also can be according to the actual demand in on-the-spot test process, in the typical wind energy turbine set operational system of setting up, by the various types of failure modes of MATLAB emulation real time modelling, generate new disturbance voltage command signal U
refafter be input in the operating platform of disturbing generating device for calling in test, and be not only confined to call typical voltage disturbance curve.
S2, by between two modularization multi-level converters accesses electrical network 35kV buses that connect dorsad and wind-powered electricity generation unit 35kV bus to be tested.Two modularization multi-level converters that connect dorsad form the kernal hardware part of described wind-powered electricity generation unit grid adaptability proving installation, compare with existing similar proving installation, save the step-up transformer of both sides in wind-powered electricity generation unit disturbing generating device in the past, substituted by modularization multi-level converter, control more flexible.Above-mentioned multilevel converter is made up of 6 brachium pontis, each brachium pontis interconnects by N and structure is identical submodule and a reactor are composed in series, QK1 and QK2 are disturbing generating device and wind-powered electricity generation unit and the interconnective isolating switch of AC system side (the first isolating switch and the second isolating switch), QK1 is for input and the excision of tested wind-powered electricity generation unit, and QK2 is for the level and smooth startup control of this disturbing generating device direct current.The modularization multi-level converter of both sides completes control Objective and function separately, wherein modularization multi-level converter (the GS-MMC of 35kV AC system side, Grid-side MMC) mainly using dc-voltage balance and reactive power as controlling target, maintain direct current both positive and negative polarity voltage constant, under various voltage disturbances, isolate wind-powered electricity generation unit side and system side, ensure that synchronization AC system is not subject to the impact of voltage disturbance, can also provide certain reactive power supporting capacity to system simultaneously; Modularization multi-level converter (the WT-MMC of tested wind-powered electricity generation unit 35kV side, Wind-turbine side MMC) mainly realize the tracking control of various disturbance voltages, the necessary enough disturbance voltage of track reference rapidly and accurately of its output voltage, to meet the requirement of carrying out running of wind generating set adaptability and Power Quality Detection.
S3, startup modularization multi-level converter: use electrical network 35KV busbar voltage to start two modularization multi-level converters that connect dorsad, the modularization multi-level converter being wherein connected with wind-powered electricity generation unit 35kV bus starts module by DC charging and starts.This is because wind energy turbine set cannot provide startup power supply to wind farm side modularization multi-level converter WT-MMC, and therefore WT-MMC starts the AC network that institute's energy requirement connects from offside GS-MMC, and by DC line, its submodule electric capacity is charged.
The detailed process of above-mentioned steps S3: first, close circuit breaker QK2, AC network is charged to GS-MMC and WT-MMC submodule electric capacity by the uncontrollable rectified action of diode simultaneously, the energy source of now GS-MMC charging is in AC network, and each brachium pontis N submodule series connection enters between AC system two-phase; And WT-MMC starts by DC line, every phase upper and lower bridge arm altogether 2N submodule series connection arrives between direct-flow positive pole and negative pole.That is to say, in uncontrollable commutation phase, it is 2 times that GS-MMC drops into that WT-MMC drops into submodule number, and after uncontrollable rectification finishes, the each submodule DC capacitor voltage of GS-MMC is 2 times of WT-MMC.
Secondly, when circuit DC voltage reaches after ac line voltage peak value, start the submodule number of WT-MMC control system to reduce by half and to drop into, AC network continues each submodule capacitor charging to WT-MMC by DC line, and each submodule capacitance voltage of GS-MMC remains unchanged.In the time reaching stable state, direct current two pole tension V
dc, GS-MMC submodule capacitance voltage V
dc, jkwith WT-MMC submodule capacitance voltage V
wdc, jkwith alternating current netting twine voltage effective value V
gRMSmeet relational expression as follows:
The high-frequency rectification of S4, control electrical network 35KV bus bar side multilevel converter, make the capacitance voltage of each submodule be adjusted into designated value, control and follow the tracks of wind-powered electricity generation unit side multilevel converter voltage, realize multilevel converter wind-powered electricity generation unit side output voltage and disturbance voltage command signal U
reftracking control.Export various types of disturbance voltage, to reach the target to running of wind generating set adaptability and electric energy quality test.The detailed process of this step is: complete after the direct current start-up course of WT-MMC and GS-MMC, start the control circuit of GS-MMC and WT-MMC, closed wind farm side circuit breaker Q K1.Wherein GS-MMC starts high-frequency rectification control, improves submodule capacitance voltage to ratings, and remain near each capacitance voltage set-point by DC current control mode; The WT-MMC various disturbance voltage reference value U that obtaining step S1 generates
ref, guaranteeing that GS-MMC and WT-MMC two ends Converter DC-side voltage synchronously rise until under the prerequisite of ratings, realize WT-MMC wind-powered electricity generation unit side voltage and disturbance voltage instruction value U
refrapid track and control, making wind-powered electricity generation unit AC voltage is the various disturbance voltages by MATLAB programmable simulation, to reach the target to running of wind generating set adaptability and electric energy quality test.
The present invention provides a kind of wind-powered electricity generation unit grid adaptability proving installation based on modularization multi-level converter by above embodiment, and this device can be used for running of wind generating set adaptability and electric energy quality test.The main circuit topological structure that this device adopts wind farm side modularization multi-level converter to be connected back-to-back with electric system side modularization multi-level converter, without accessing respectively transformer at wind farm side and grid side, also utilize the operating experience of current modularization multi-level converter in HVDC (High Voltage Direct Current) transmission system simultaneously, solve the problem such as IGBT device withstand voltage and through-current capability restriction, diversity that can implement device function and control dirigibility.By the MATLAB simulation software various voltage disturbances of simulating grid neatly, the disturbance voltage instruction generating is accessed to the control module of disturbing generating device by DLL (dynamic link library), the multiple disturbance operating modes such as voltage fluctuation under simulation wind-electricity integration electric pressure, frequency jitter, imbalance, voltage distortion and flickering, provide a kind of and normally move the wind-powered electricity generation unit grid adaptability test new method under prerequisite not affecting wind power system.
Fig. 1 is wind-powered electricity generation unit grid adaptability proving installation and the control block diagram thereof based on modularization multi-level converter.This device is made up of two back-to-back modularization multi-level converters, and series connection is between AC network 35kV bus and wind-powered electricity generation unit 35kV bus to be tested.As shown in Figure 1, the each modularization multi-level converter of wind-powered electricity generation unit side and grid side is made up of 6 brachium pontis, and each brachium pontis is by N half-bridge submodule and the reactor L that (in this embodiment, N=20) interconnects and structure is identical
abe composed in series R
arepresent the dead resistance of reactor.Taking one of them submodule as example, T
1, jk, T
2, jkand D
1, jk, D
2, jkrepresent respectively igbt (IGBT) and the anti-paralleled diode thereof of k half-bridge submodule of j brachium pontis, V
dc, jkrepresent the DC capacitor voltage of k half-bridge submodule of j brachium pontis, u
1, jk, u
2, jkrepresent the AC lead-out terminal of k half-bridge submodule of j brachium pontis.Each half-bridge submodule carries out full module voltage (T in two kinds of direction of current situations
1, jkopen-minded, T
2, jkturn-off) V
dc, jkwith zero module voltage (T
1, jkturn-off T
2, jkopen-minded) between switching.Each submodule has 3 kinds of duties: (1) T
1, jkand T
2, jkall turn-off.In this state, if electric current flows into and flows towards AC direction from the positive direct-current utmost point, electric current flows through capacitor it is charged; In the time that electric current flows towards reverse direction, electric current will be walked around capacitor, and this is blocking; (2) T
1, jkconducting, T
2, jkturn-off.In this state, submodule is in running order, and electric current charges to capacitor by fly-wheel diode, or passes through T
1, jkgive capacitor discharge; (3) T
1, jkturn-off T
2, jkconducting.In this state, electric current or flow through T
2, jk, or flow through fly-wheel diode, and ensureing that no-voltage is applied to the two ends of submodule, condenser voltage is unchanged.
Fig. 2 is each submodule DC capacitor voltage oscillogram of every phase in the grid side multilevel converter of wind-powered electricity generation unit grid adaptability proving installation.The each brachium pontis of grid side multilevel converter adopts 20 half-bridges to form, under stable situation the equal stable operation of DC capacitor voltage of 20 submodules of each brachium pontis at 2.5kV, every mutually upper and lower brachium pontis submodule voltage fluctuation opposite direction.Fig. 3 is that grid side multilevel converter AC A, B, the C three-phase of proving installation exported many level oscillogram.As seen from the figure, each phase output voltage is 21 level, and between every phase, phase place mutual deviation 120 is spent.In the present embodiment, wind-powered electricity generation unit side is identical with the structure of grid side transverter, and the voltage waveform of the each submodule of wind-powered electricity generation unit side similarly, repeats no more.
The dynamic waveform of each electric parameters when Fig. 4～Fig. 8 is respectively and simulates various types of voltage disturbance in the embodiment of the present invention, mainly comprises that voltage single-phasely falls, three-phase falls, Voltage unbalance, voltage distortion, voltage flicker etc.In order to reflect dynamic perfromance, simulation wind-powered electricity generation unit side joint enters the double-fed wind generator unit that capacity is 2MW.In figure, be followed successively by from top to bottom: the disturbance voltage reference value U that wind-powered electricity generation unit side form is intended
ref, wind-powered electricity generation unit side virtual voltage U
w, wind-powered electricity generation unit side electric current I
w, DC side the two poles of the earth voltage U
dc.
Wherein, Fig. 4 is dynamic waveform figure when single-phase fault-A phase voltage drops to 20% ratings in the embodiment of the present invention.As seen from the figure, from the 0.5s moment, simulate wind-powered electricity generation set grid-connection point 35kV side A single-phase fault occurs mutually in MATLAB emulation platform, its voltage drops to 20% ratings, forms command voltage U
ref; Disturbing generating device is accurately simulated U after voltage-tracing control
ref, make wind-powered electricity generation unit side output voltage U
wdynamically floating voltage instruction U
ref, wind-powered electricity generation unit side electric current I
wchange DC voltage U along with change in voltage
dcbe stabilized near 51.5kV, dynamic process DC voltage is without large impact.
Fig. 5 simulates wind-powered electricity generation set grid-connection point 35kV side, at 0.5s, three-phase fault occurs in the embodiment of the present invention, dynamic waveform figure while causing three-phase voltage all to drop to 20% ratings, the low voltage crossing characteristic for detection of wind-powered electricity generation unit in the time that three-phase voltage falls simultaneously.In figure, 35kV site drop to the voltage of 20% ratings simultaneously through disturbing generating device output three-phase voltage, and DC-side Voltage Stabilization is near 51.5kV, and dynamic process is without large impact.
Fig. 6 simulates the dynamic waveform figure of wind-powered electricity generation set grid-connection point 35kV side in the time that 0.5s injects 20% negative sequence voltage component in the embodiment of the present invention, the dynamic perfromance for detection of wind-powered electricity generation unit when the Voltage unbalance; Fig. 7 is that in the embodiment of the present invention, three-phase injects and dynamic waveform figure when 5% 7 subharmonic voltage component 5% for 5 times, the dynamic perfromance for detection of wind-powered electricity generation unit in the time that grid-connected point voltage occurs to distort; Fig. 8 is the dynamic waveform figure of three-phase when to inject 1% frequency be the component of voltage of 8.8Hz in the embodiment of the present invention, the dynamic perfromance for detection of wind-powered electricity generation unit when the voltage flicker.Find out from the simulation result of various disturbances, the various voltage instructions that wind-powered electricity generation unit grid adaptability proving installation based on modularization multi-level converter can send according to MATLAB are dynamically adjusted the output voltage of proving installation wind-powered electricity generation unit side 35kV bus, dynamic perfromance and precision can reach and detect the adaptive requirement of running of wind generating set, this generating means can not cause larger impact and impact to electrical network simultaneously, and take full advantage of the advantage of modularization multi-level converter, without step-up transformer, this device directly can be accessed to wind-powered electricity generation unit 35kV and grid adaptability test is carried out in site.
Those of ordinary skill in the art will appreciate that, embodiment described here is in order to help reader understanding's principle of the present invention, should be understood to that protection scope of the present invention is not limited to such special statement and embodiment.Those of ordinary skill in the art can make various other various concrete distortion and combinations that do not depart from essence of the present invention according to these technology enlightenments disclosed by the invention, and these distortion and combination are still in protection scope of the present invention.
Claims (6)
1. wind-powered electricity generation unit grid adaptability proving installation, is characterized in that, comprises two modularization multi-level converters that connect dorsad, one of multilevel converter be connected with wind-powered electricity generation unit 35KV bus, another multilevel converter connection electrical network 35KV bus; Device also comprises that disturbance generation module and DC charging start module, described disturbance generation module comprises that described disturbance generation module is connected with the modularization multi-level converter that is connected wind-powered electricity generation unit 35KV bus for generation of the control module of the software signal generating unit of disturbance control signal and execution control signal generation disturbing signal; Described DC charging starts module and is connected between the multilevel converter and electrical network 35KV bus being connected with wind-powered electricity generation unit 35KV bus, for starting the multilevel converter being connected with wind-powered electricity generation unit 35KV bus.
2. wind-powered electricity generation unit grid adaptability proving installation according to claim 1, it is characterized in that, described software signal generating unit comprises for the MATLAB programming unit of simulation wind energy turbine set disturbance control signal, the control signal output unit for storing the case thesaurus of described control signal and being connected with control module of programming.
3. wind-powered electricity generation unit grid adaptability proving installation according to claim 1 and 2, is characterized in that, described control signal comprises one or more disturbance control signals in wind energy turbine set voltage fluctuation, frequency hopping, voltage harmonic, three-phase imbalance and flickering.
4. according to the wind-powered electricity generation unit grid adaptability proving installation described in any one claim of claims 1 to 3, it is characterized in that, described device also comprises the first isolating switch that connects and disconnect for controlling tested wind-powered electricity generation unit, for level and smooth the second isolating switch starting of control disturbance generation module direct current.
5. the method for testing of utilizing above-mentioned wind-powered electricity generation unit grid adaptability proving installation, is characterized in that, comprises the following steps:
In S1, use MATLAB programming unit, wind energy turbine set operational system realistic model is built by simulation software, the voltage disturbance mode of simulation wind energy turbine set, described disturbance comprises one or more in voltage fluctuation, frequency jitter, three-phase imbalance, three phase distortions and voltage flicker, generate the three-phase disturbance voltage U ref of wind-powered electricity generation unit 35kV site, and deposit the voltage disturbance curve of described perturbation scheme in case thesaurus;
S2, by between two modularization multi-level converters accesses electrical network 35kV buses that connect dorsad and wind-powered electricity generation unit 35kV bus to be tested;
S3, startup modularization multi-level converter: use electrical network 35KV busbar voltage to start two modularization multi-level converters that connect dorsad, the modularization multi-level converter being wherein connected with wind-powered electricity generation unit 35kV bus starts module by DC charging and starts;
The high-frequency rectification of S4, control electrical network 35KV bus bar side multilevel converter, make the capacitance voltage of each submodule be adjusted into designated value, control and follow the tracks of wind-powered electricity generation unit side multilevel converter voltage, realize multilevel converter wind-powered electricity generation unit side output voltage and disturbance voltage command signal U
reftracking control.
6. method according to claim 5, in step S1, use simulation software in MATLAB programming unit to build wind energy turbine set operational system realistic model, realize and to the process of wind energy turbine set voltage disturbance emulation be: the SIMULINK module based on MATLAB simulation software is built the realistic model of wind energy turbine set operational system, this model is by the equivalent infinitely great power supply of AC network, alternating current circuit and wind-powered electricity generation unit composition, on different circuits or bus, arrange single-phase, two-phase unbalanced fault or three-phase shortcircuit earth fault, simulating grid voltage falls, three-phase imbalance, three phase distortions and voltage flicker voltage disturbance, generate the three-phase disturbance voltage command signal U of wind-powered electricity generation set grid-connection point
ref, described voltage disturbance curve classification is deposited in case thesaurus simultaneously, reuse for noisy data.
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| CN105548696A (en) * | 2015-12-16 | 2016-05-04 | 山东大学 | Adaptive far-end detection system and method for harmonic waves of blower fan based on distributed parameter circuit |
| CN107219772A (en) * | 2017-05-23 | 2017-09-29 | 南方电网科学研究院有限责任公司 | Test method, the apparatus and system of many line downs suppression and isolating device functional parameter |
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