CN103969578B - 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 invention belongs to wind power generating set accesses the networking detection technique field of power system and in particular to one kind is based on
The megawatt-level wind unit grid adaptability test device of modularization multi-level converter and method of testing.
Background technology
At present, proportion in electrical network for the Wind Power In China improves constantly, and by dispersion, on a small scale exploitation, on-site elimination
Progressively concentrate exploitation to extensive, high, remote, high voltage power network developer conveying direction.For the grid-connected work of specification wind energy turbine set,
Promote wind-powered electricity generation science sustainable health development it is ensured that wind energy turbine set and power network safety operation, State Grid Corporation of China has put into effect " state
Family's grid company wind energy turbine set accesses electric power network technique regulation ".In terms of wind energy turbine set runs adaptability, specify that wind energy turbine set in difference simultaneously
Operating provisions in site voltage range, frequency range；In terms of the wind energy turbine set quality of power supply, specify that wind energy turbine set is inclined to voltage
The specific requirement of difference, flickering, harmonic wave etc..In other words, when electrical network occurs voltage pulsation, frequency hopping, voltage harmonic or three-phase
During the various disturbances such as imbalance, flickering, the Wind turbines being incorporated into the power networks must possess good electrical network adaptability.Therefore, right
The operation adaptability of Wind turbines and Power Quality Detection are very important.At present, China has possessed wind turbine generator system low voltage
The detection meanss of ride-through capability, but whether can stand the power of test also relative thin of the various disturbances of electrical network for Wind turbines
Weak it is necessary to combine Wind turbines dynamic characteristic, on the premise of guaranteeing original electric power system is not impacted, propose one
Plant the Wind turbines grid adaptability test device being adapted under current wind farm electric pressure.
Chinese scholars have carried out the research of correlation in terms of controllable voltage disturbing generating device, but are not bound with wind-powered electricity generation
The actual application scenario in field and correlation technique difficult point are furtherd investigate.Learnt according to patent retrieval, Chinese invention
201010234259.4 providing and a kind of Wind turbines are carried out with network access testing and Large Scale Wind Farm Integration is incorporated into the power networks detecting
The disturbing generating device evaluated.This disturbing generating device produces the various voltages for Wind turbines test, is disturbed by low-frequency voltage
Dynamic device and high frequency voltage disturbance device composition, low-frequency voltage disturbance device by start resistance, step-down transformer, wave filter and
Connection voltage source converter module and booster transformer composition, realize the function of low-frequency voltage disturbance；High frequency voltage disturbance device by
Start resistance, rectifier transformer, pwm rectifier module, cascade h bridge module and wave filter composition, realize output 2～25 subharmonic
Voltage function.The advantage of its invention is to can achieve that voltage pulsation, frequency fluctuation, voltage distortion and imbalance of three-phase voltage etc. are many
Plant disturbance, every phase voltage can adjust respectively, meet Wind turbines and require in electronic switching and generating state between.But this dress
Put have the shortcomings that complex structure, expensive, control difficulty big, low-frequency voltage disturbance and high frequency voltage disturbance device series connection fortune
Easily interfere during row, control effect is easily affected.
Content of the invention
The invention aims to solving the low frequency using series connection for the existing Wind turbines grid adaptability test device
Voltage disturbance device and high frequency voltage disturbance device complex structure, expensive, control difficulty big and easily interfere etc. no
Sufficient it is proposed that a kind of Wind turbines grid adaptability test device and based on described device Wind turbines grid adaptability survey
Method for testing.
The technical scheme is that Wind turbines grid adaptability test device it is characterised in that including two dorsad
Connect modularization multi-level converter, one of multilevel converter be connected with Wind turbines 35kv bus, another many level
Inverter connects electrical network 35kv bus；Device also includes disturbance and module and DC charging starting module occurs, and described disturbance occurs
Module includes the software signal generating unit for producing disturbance control signal and executes the control that control signal produces disturbing signal
Unit processed, described disturbance occurs module to be connected with the modularization multi-level converter being connected Wind turbines 35kv bus；Described
DC charging starting module be connected to the multilevel converter being connected with Wind turbines 35kv bus and electrical network 35kv bus it
Between, for starting the multilevel converter being connected with Wind turbines 35kv bus.
Further, described software signal generating unit is included for programming simulation wind energy turbine set disturbance control signal
Matlab programming unit, for storing the case thesauruss of described control signal and the control signal being connected with control unit
Output unit.
Further, described control signal includes wind energy turbine set voltage pulsation, frequency hopping, voltage harmonic, three-phase imbalance
And one or more disturbance control signal in flickering.
Further, described device also includes the first chopper for controlling tested Wind turbines to be connected and disconnected from, and uses
Module direct current is occurred to smooth the second chopper of startup in control disturbance.
Using above-mentioned Wind turbines grid adaptability test device method of testing it is characterised in that comprising the following steps:
S1, build wind energy turbine set runtime phantom using simulation software in matlab programming unit, simulate wind energy turbine set
Voltage disturbance mode, described disturbance includes voltage pulsation, frequency fluctuation, three-phase imbalance, three phase distortions and voltage flicker
One or more of, generate three-phase disturbance voltage uref of Wind turbines 35kv grid entry point, and the electricity by described perturbation scheme
Pressure disturbance curve is stored in case thesauruss；
S2, two modularization multi-level converters of dorsad connecting are accessed electrical network 35kv buses and wind turbine to be tested
Between group 35kv bus；
S3, starting module multilevel converter: start two modules dorsad connecting using electrical network 35kv busbar voltage
Change multilevel converter, the modularization multi-level converter being wherein connected with Wind turbines 35kv bus is opened by DC charging
Dynamic model block starts；
S4, the high-frequency rectification of control electrical network 35kv bus bar side multilevel converter, make the capacitance voltage of each half-bridge submodule
It is adjusted to designated value, control and follow the tracks of Wind turbines side multilevel converter voltage, realize multilevel converter Wind turbines side defeated
Go out voltage and disturbance voltage command signal urefTracing control.
Further, build wind energy turbine set runtime emulation mould using simulation software in matlab programming unit in step s1
Type, the process realizing wind energy turbine set voltage disturbance is emulated is: builds wind-powered electricity generation based on the simulink module of matlab simulation software
The phantom of field runtime, this model is made up of AC network equivalent infinity power supply, alternating current circuit and Wind turbines,
Setting single-phase, two-phase unbalanced fault or three-phase shortcircuit earth fault on different circuits or bus, simulating grid Voltage Drop, three
Mutually imbalance, three phase distortions and voltage flicker voltage disturbance, generates the three-phase disturbance voltage instruction letter of Wind turbines grid entry point
Number uref；Described voltage disturbance curve classification is stored in case thesauruss simultaneously, reuses for noisy data.
Beneficial effects of the present invention: the Wind turbines grid adaptability test device of the present invention, programmable using matlab
Various disturbances under Wind turbines grid-connected voltage grade can be included voltage pulsation, frequency hopping, voltage humorous by the mode of emulation
Ripple or three-phase imbalance, flickering etc. carry out flexible simulation.Meanwhile, this device adopts modular multilevel converter structure, no
Need transformator, directly series connection accesses in the electrical network of 35kv grid-connected voltage grade of current Wind turbines.In view of modular multilevel
Inverter with more ripe, therefore can meet the multiformity of apparatus function completely and control flexibly in straight-flow system
Property, reach the requirement of Wind turbines dynamic characteristic test in the case of the electronic and various disturbance of generating state, and to grid-connected
Power system does not cause large effect and impact.And voltage disturbance form can freely be selected by human-computer interaction interface, have
The pointedly operation adaptability of detection Wind turbines and quality of power supply index of correlation；This device series connection is in tested Wind turbines
Between bus bar side and AC network it is achieved that Wind turbines side is completely isolated with grid side, the fault of such Wind turbines side
Do not interfere with the normal operation of AC network.
Brief description
Fig. 1 is the Wind turbines grid adaptability test device and its controller chassis diagram based on modularization multi-level converter
It is intended to.
Fig. 2 is each submodule DC capacitor voltage oscillogram in the grid side multilevel converter of test device.
Fig. 3 is that grid side multilevel converter AC a, b, c three-phase of test device exports many level waveforms figure.
Fig. 4 is that in the embodiment of the present invention, single-phase fault-a phase voltage drops to oscillogram during 20% rated value.
Fig. 5 is that in the embodiment of the present invention, three-phase fault-three-phase voltage all drops to oscillogram during 20% rated value.
Fig. 6 is the oscillogram during negative sequence voltage components of imbalance of three-phase voltage-injection 20% in the embodiment of the present invention.
Fig. 7 be in the embodiment of the present invention three-phase injection 5 times of 5% and 5% 7 subharmonic voltage component when oscillogram.
Fig. 8 is the oscillogram that in the embodiment of the present invention, three-phase injects during the component of voltage that 1% frequency is 8.8hz.
Specific embodiment
The following examples of the present invention are implemented premised on technical solution of the present invention, give detailed embodiment
With specific operating process, but protection scope of the present invention is not limited to following embodiments.
As shown in figure 1, the Wind turbines grid adaptability test device of the present embodiment, including two modules dorsad connecting
Change multilevel converter, one of multilevel converter be connected with Wind turbines 35kv bus, the connection of another multilevel converter
Electrical network 35kv bus；Device also includes disturbance and module and DC charging starting module occurs, and described disturbance occurs module to include using
Produce the control unit of disturbing signal in the software signal generating unit producing disturbance control signal and execution control signal, described
Disturbance occurs module to be connected with the modularization multi-level converter being connected Wind turbines 35kv bus；Described DC charging starts
Module is connected between the multilevel converter being connected with Wind turbines 35kv bus and electrical network 35kv bus, for start with
The multilevel converter that Wind turbines 35kv bus is connected.Software signal generating unit therein is by for programming simulation wind-powered electricity generation
The matlab programming unit of field disturbance control signal, case thesauruss and and control unit for storing described control signal
The control signal output unit composition being connected.
In the present embodiment, wind energy turbine set voltage pulsation is included by the control signal that matlab programming unit produces, frequency is jumped
One or more disturbance control signal in change, 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 includes the first open circuit for controlling tested Wind turbines to be connected and disconnected from
Device, occurs module direct current to smooth the second chopper of startup for control disturbance.
The present embodiment provide a kind of method of testing using above-mentioned Wind turbines grid adaptability test device, including with
Lower step:
S1, build wind energy turbine set runtime phantom using simulation software in matlab programming unit, simulate wind energy turbine set
Voltage disturbance mode, described disturbance includes voltage pulsation, frequency fluctuation, three-phase imbalance, three phase distortions and voltage flicker
One or more of, generate three-phase disturbance voltage uref of Wind turbines 35kv grid entry point, and the electricity by described perturbation scheme
Pressure disturbance curve is stored in case thesauruss.Its detailed process is: builds wind based on the simulink module of matlab simulation software
The phantom of electric field runtime, this model is made up of AC network equivalent infinity power supply, alternating current circuit and Wind turbines,
Setting single-phase, two-phase unbalanced fault or three-phase shortcircuit earth fault on different circuits or bus, simulating grid Voltage Drop,
Three-phase imbalance, three phase distortions and voltage flicker voltage disturbance, generate the three-phase disturbance voltage instruction of Wind turbines grid entry point
Signal uref；Described voltage disturbance curve classification is stored in case thesauruss simultaneously, reuses for noisy data.Using
The device of the present embodiment or method, also dependent on the actual demand during on-the-spot test, various by matlab analogue simulation
The failure mode of type simultaneously generates new disturbance voltage uref.
Above-mentioned build typical wind energy turbine set runtime topological structure using matlab simulation software, realize each to wind energy turbine set
The emulation of kind of voltage disturbance, comprehensive for test result, also dependent on the actual demand during on-the-spot test, set up
In typical wind energy turbine set runtime, the various types of failure mode of real-time Simulation is emulated by matlab, generate new disturbance voltage
Command signal urefIt is input to afterwards in the operating platform of disturbing generating device and calls in test, and be not limited solely to call allusion quotation
The voltage disturbance curve of type.
S2, two modularization multi-level converters of dorsad connecting are accessed electrical network 35kv buses and wind turbine to be tested
Between group 35kv bus.Two modularization multi-level converters dorsad connecting form described Wind turbines grid adaptability test
The hardcore part of device, compared with existing similar test device, eliminates in conventional Wind turbines disturbing generating device
The booster transformer of both sides, is substituted by modularization multi-level converter, controls more flexible.Above-mentioned multilevel converter is by 6
Individual brachium pontis composition, each brachium pontis is connected with each other by n and structure identical submodule is composed in series with a reactor, qk1 with
Qk2 is disturbing generating device and the interconnective chopper of Wind turbines and AC system side (the first chopper and the second open circuit
Device), qk1 is used for input and the excision of tested Wind turbines, and the smooth startup that qk2 is used for this disturbing generating device direct current controls.
The modularization multi-level converter of both sides completes respective control targe and function, and the modularity of wherein 35kv AC system side is many
Level converter (gs-mmc, grid-side mmc) mainly using dc-voltage balance and reactive power as control targe, maintains
Direct current both positive and negative polarity voltage constant, under various voltage disturbances isolation Wind turbines side and system side it is ensured that synchronization AC system not
Affected by voltage disturbance, certain reactive power enabling capabilities can also be provided to system simultaneously；Tested Wind turbines 35kv
The modularization multi-level converter (wt-mmc, wind-turbine side mmc) of side mainly realize various disturbance voltages with
Track controls, and its output voltage must quickly be accurately tracked by the disturbance voltage of reference enough, carries out running of wind generating set to meet
Adaptability and the requirement of Power Quality Detection.
S3, starting module multilevel converter: start two modules dorsad connecting using electrical network 35kv busbar voltage
Change multilevel converter, the modularization multi-level converter being wherein connected with Wind turbines 35kv bus is opened by DC charging
Dynamic model block starts.This is because wind energy turbine set cannot provide startup power supply to wind farm side modularization multi-level converter wt-mmc,
The AC network that energy needed for therefore wt-mmc startup is connected from offside gs-mmc, and by DC line to its submodule
Electric capacity is charged.
The detailed process of above-mentioned steps s3: first, close circuit breaker qk2, AC network passes through the uncontrollable rectification of diode
Effect is charged to gs-mmc and wt-mmc submodule electric capacity simultaneously, and the energy that now gs-mmc charges derives from AC network, often
Between individual brachium pontis n sub- block coupled in series incoming transport system is biphase；And wt-mmc is started by DC line, every phase upper and lower bridge arm
Common 2n sub- block coupled in series is connected between direct-flow positive pole and negative pole.In other words, in uncontrollable commutation phase, wt-mmc puts into son
Number of modules is 2 times that gs-mmc puts into, then, after uncontrollable rectification terminates, each submodule DC capacitor voltage of gs-mmc is wt-
2 times of mmc.
Secondly, after circuit DC voltage reaches ac line voltage peak value, start wt-mmc control system to halve input
Submodule number, AC network continues each submodule electric capacity of wt-mmc is charged by DC line, and each height of gs-mmc
Module capacitance voltage keeps constant.When reaching stable state, direct current two pole tension vdc, gs-mmc submodule capacitor voltage vdc,jkWith
Wt-mmc submodule capacitor voltage vwdc,jkWith AC network line voltage virtual value vgrmsMeet relational expression as follows:
S4, the high-frequency rectification of control electrical network 35kv bus bar side multilevel converter, make the capacitance voltage of each half-bridge submodule
It is adjusted to designated value, control and follow the tracks of Wind turbines side multilevel converter voltage, realize multilevel converter Wind turbines side defeated
Go out voltage and disturbance voltage command signal urefTracing control.Export various types of disturbance voltages, to reach to Wind turbines
Run the target of adaptability and electric energy quality test.The detailed process of this step is: the direct current completing wt-mmc and gs-mmc opens
After dynamic process, then start the control circuit of gs-mmc and wt-mmc, close wind farm side chopper qk1.Wherein gs-mmc starts
High-frequency rectification controls, and improves submodule capacitor voltage to rated value by DC current control mode, and is maintained at each electric capacity electricity
Near pressure set-point；Wt-mmc various disturbance voltage reference values u that then obtaining step s1 generatesref, guaranteeing gs-mmc and wt-
Mmc two ends Converter DC-side voltage synchronous rise until on the premise of rated value, realize wt-mmc Wind turbines side voltage with
Disturbance voltage command value urefRapid track and control so that Wind turbines AC voltage is by matlab programmable simulation
Various disturbance voltages, to reach the target to running of wind generating set adaptability and electric energy quality test.
The present invention is fitted by above examples providing a kind of Wind turbines electrical network based on modularization multi-level converter
Answer system safety testing device, this device can be used for running of wind generating set adaptability and electric energy quality test.This device adopts wind farm side
The main circuit topological structure that modularization multi-level converter is connected back-to-back with power system side modularization multi-level converter, no
Transformator need to be respectively connected in wind farm side and grid side, also utilize current modularization multi-level converter in HVDC simultaneously
Operating experience in transmission system, solves the problems such as igbt device is pressure to be limited with through-current capability, achievable apparatus function
Multiformity and control motility.By the various voltage disturbances of matlab simulation software neatly simulating grid, by disturbing of generating
Dynamic voltage instruction accesses the control unit of disturbing generating device, voltage wave under simulation wind-electricity integration electric pressure by DLL
Multiple disturbance operating modes such as dynamic, frequency fluctuation, imbalance, voltage distortion and flickering, provide a kind of not affect wind power system normal
Wind turbines grid adaptability test new method under the premise of operation.
Fig. 1 is the Wind turbines grid adaptability test device and its control block diagram based on modularization multi-level converter.
This device is made up of two back-to-back modularization multi-level converters, and series connection is in AC network 35kv bus and to be tested
Between Wind turbines 35kv bus.As shown in figure 1, Wind turbines side and each modularization multi-level converter of grid side are by 6
Brachium pontis forms, and each brachium pontis is connected with each other and structure identical half-bridge submodule and one by n (in this embodiment, n=20)
Reactor laIt is composed in series, raRepresent the dead resistance of reactor.Taking one of half-bridge submodule as a example, described half-bridge submodule
Block includes the igbt of two series connection, each igbt one diode of inverse parallel respectively, and two
One DC bus capacitor device of two ends parallel connection of individual igbt；
t1,jk、t2,jkAnd d1,jk、d2,jkRepresent the insulated gate bipolar transistor of k-th half-bridge submodule of j-th brachium pontis respectively
Pipe (igbt) and its anti-paralleled diode, vdc,jkRepresent the DC capacitor voltage of k-th half-bridge submodule of j-th brachium pontis,
u1,jk、u2,jkRepresent the AC lead-out terminal of k-th half-bridge submodule of j-th brachium pontis.Each half-bridge submodule is in two kinds of electricity
Stream carries out full module voltage (t in the case of direction1,jkOpen-minded, t2,jkTurn off) and zero module voltage (t1,jkTurn off, t2,jkOpen-minded) it
Between switching.Each half-bridge submodule has 3 kinds of working conditions: (1) t1,jkAnd t2,jkIt is turned off.In this state, if electric current
Flow into and towards the flowing of AC direction from positive direct-current pole, electric current then flows through DC bus capacitor device and it is charged；When electric current towards
During rightabout flowing, electric current will bypass DC bus capacitor device, and this is blocking；(2)t1,jkConducting, t2,jkTurn off.At this
Under the state of kind, half-bridge submodule is in running order, and electric current passes through anti-paralleled diode d2,jkCharge to DC bus capacitor device, or
Person passes through t1,jkTo electric DC side condenser discharge；(3)t1,jkTurn off, t2,jkConducting.In this state, electric current or flow through t2,jk,
Or flow through anti-paralleled diode d1,jkIt is ensured that no-voltage is applied to the two ends of half-bridge submodule, condenser voltage is unchanged.
Fig. 2 is straight for mutually each submodule every in the grid side multilevel converter of Wind turbines grid adaptability test device
Stream capacitance voltage oscillogram.Each brachium pontis of grid side multilevel converter adopts 20 half-bridges to constitute, each bridge under stable situation
The equal stable operation of DC capacitor voltage of 20 submodules of arm is in 2.5kv, often mutually upper and lower brachium pontis submodule voltage pulsation direction phase
Instead.Fig. 3 is that grid side multilevel converter AC a, b, c three-phase of test device exports many level waveforms figure.In terms of in figure
Go out, each phase output voltage is 21 level, 120 degree of phase place mutual deviation between every phase.In the present embodiment, Wind turbines side and grid side are changed
The structure of stream device is identical, and the voltage waveform of each submodule in Wind turbines side is similar, repeats no more.
When simulating various types of voltage disturbance in Fig. 4～Fig. 8 respectively embodiment of the present invention, each electric parameters is dynamic
Waveform, main include voltage single-phase fall, three-phase falls, Voltage unbalance, voltage distortion, voltage flicker etc..Dynamic in order to reflect
Step response, simulation Wind turbines side access capacity is the double-fed wind generator unit of 2mw.In figure is followed successively by from top to bottom: wind turbine
Disturbance voltage reference value u that group side form is intendedref, Wind turbines side virtual voltage uw, Wind turbines side electric current iw, DC side the two poles of the earth electricity
Pressure udc.
Wherein, Fig. 4 is that in the embodiment of the present invention, single-phase fault-a phase voltage drops to dynamic waveform during 20% rated value
Figure.As seen from the figure, from the 0.5s moment, in matlab emulation platform, simulation Wind turbines grid entry point 35kv side a phase is sent out
Raw single-phase fault, the rated value of its Voltage Drop to 20%, form command voltage uref；Disturbing generating device then through overvoltage with
Track accurate simulation u after controllingrefSo that Wind turbines side output voltage uwDynamic tracking voltage instruction uref, Wind turbines side
Electric current iwChange with change in voltage, DC voltage udcStablize near 51.5kv, dynamic process DC voltage is no big
Impact.
Fig. 5 is that in the embodiment of the present invention, simulation Wind turbines grid entry point 35kv side occurs three-phase fault in 0.5s, leads to three
Phase voltage all drops to dynamic waveform figure during 20% rated value, for detecting Wind turbines when three-phase voltage falls simultaneously
Low voltage crossing characteristic.In figure 35kv grid entry point drops to 20% rated value through disturbing generating device output three-phase voltage simultaneously
Voltage, DC-side Voltage Stabilization near 51.5kv, the no big impact of dynamic process.
Fig. 6 is that in the embodiment of the present invention, simulation Wind turbines grid entry point 35kv side is divided in the negative sequence voltage of 0.5s injection 20%
Dynamic waveform figure during amount, for detecting the dynamic characteristic in Voltage unbalance for the Wind turbines；Fig. 7 is in the embodiment of the present invention
Three-phase injection 5 times of 5% and 5% 7 subharmonic voltage component when dynamic waveform figure, for detecting Wind turbines in grid entry point
Dynamic characteristic when voltage is distorted；Fig. 8 is that in the embodiment of the present invention, three-phase injects the component of voltage that 1% frequency is 8.8hz
When dynamic waveform figure, for detecting the dynamic characteristic in voltage flicker for the Wind turbines.In terms of the simulation result of various disturbances
Go out, the Wind turbines grid adaptability test device based on modularization multi-level converter can according to matlab send various
Voltage instruction dynamically adjusts the output voltage of test device Wind turbines side 35kv bus, and dynamic characteristic and precision can reach
Detect the adaptive requirement of running of wind generating set, this generating means will not cause larger impact and impact to electrical network simultaneously, and
The advantage taking full advantage of modularization multi-level converter, without booster transformer, you can this device is directly accessed wind turbine
Group 35kv grid entry point carries out grid adaptability test.
Those of ordinary skill in the art will be appreciated that, embodiment described here is to aid in reader and understands this
Bright principle is it should be understood that protection scope of the present invention is not limited to such special statement and embodiment.This area
Those of ordinary skill can make various other each without departing from present invention essence according to these technology disclosed by the invention enlightenment
Plant concrete deformation and combine, these deform and combine still within the scope of the present invention.
Claims (5)
1. Wind turbines grid adaptability test device is changed it is characterised in that including two modular multilevels dorsad connecting
Stream device, one of multilevel converter be connected with Wind turbines 35kv bus, another multilevel converter connects electrical network 35kv mother
Line；Device also includes disturbance and module and DC charging starting module occurs, and described disturbance occurs module to include for producing disturbance
The software signal generating unit of control signal and the control unit of execution control signal generation disturbing signal, there is mould in described disturbance
Block is connected with the modularization multi-level converter being connected Wind turbines 35kv bus；Described DC charging starting module is connected to
Between the multilevel converter being connected with Wind turbines 35kv bus and electrical network 35kv bus, for startup and Wind turbines
The multilevel converter that 35kv bus is connected；
Wind turbines side and each modularization multi-level converter of grid side are made up of 6 brachium pontis, and each brachium pontis is mutually interconnected by n
Connect and structure identical half-bridge submodule and a reactor laIt is composed in series；
Described half-bridge submodule includes the igbt of two series connection, and each igbt is respectively instead simultaneously
One diode of connection, one DC bus capacitor device of two ends parallel connection of two igbts；
t1,jk、t2,jkAnd d1,jk、d2,jkRepresent the igbt of k-th half-bridge submodule of j-th brachium pontis respectively
(igbt) and its anti-paralleled diode, vdc,jkRepresent the DC capacitor voltage of k-th half-bridge submodule of j-th brachium pontis,
u1,jk、u2,jkRepresent the AC lead-out terminal of k-th half-bridge submodule of j-th brachium pontis；
Each half-bridge submodule carries out the switching between full module voltage and zero module voltage in the case of two kinds of senses of current；Institute
Stating full module voltage is t1,jkOpen-minded, t2,jkTurn off；Described zero module voltage is t1,jkTurn off, t2,jkOpen-minded；
Each half-bridge submodule has 3 kinds of working conditions: (1) t1,jkAnd t2,jkIt is turned off, in this state, if electric current is from just
Direct current pole flows into and towards the flowing of AC direction, and electric current then flows through DC bus capacitor device and it is charged；When electric current is towards contrary
During the flowing of direction, electric current will bypass DC bus capacitor device, and this is blocking；(2)t1,jkConducting, t2,jkTurn off, in this shape
Under state, half-bridge submodule is in running order, and electric current passes through anti-paralleled diode d2,jkCharge to DC bus capacitor device, or logical
Cross t1,jkTo the electric discharge of DC bus capacitor device；(3)t1,jkTurn off, t2,jkConducting, in this state, electric current or flow through t2,jk, or stream
Cross anti-paralleled diode d1,jkIt is ensured that no-voltage is applied to the two ends of half-bridge submodule, DC capacitor voltage is unchanged.
2. Wind turbines grid adaptability test device according to claim 1 is it is characterised in that described software signal is sent out
Raw unit includes simulating the matlab programming unit of wind energy turbine set disturbance control signal, being used for storing described control signal for programming
Case thesauruss and the control signal output unit being connected with control unit.
3. Wind turbines grid adaptability test device according to claim 1 and 2 is it is characterised in that described control is believed
Number include wind energy turbine set voltage pulsation, frequency hopping, voltage harmonic, in three-phase imbalance and flickering one or more disturbance control letter
Number.
4. Wind turbines grid adaptability test device according to claim 3 is it is characterised in that described device also includes
For the first chopper controlling tested Wind turbines to be connected and disconnected from, module direct current is occurred to smooth startup for control disturbance
Second chopper.
5. utilize the method for testing of the Wind turbines grid adaptability test device of one of claim 1～4 it is characterised in that
Comprise the following steps:
S1, build wind energy turbine set runtime phantom using simulation software in matlab programming unit, the electricity of simulation wind energy turbine set
Pressure perturbation scheme, described perturbation scheme includes voltage pulsation, frequency fluctuation, three-phase imbalance, three phase distortions and voltage flicker
One or more of, generate three-phase disturbance voltage u of Wind turbines 35kv grid entry pointref, and the voltage by described perturbation scheme
Disturbance curve is stored in case thesauruss；
S2, two modularization multi-level converters of dorsad connecting are accessed electrical network 35kv buses and Wind turbines to be tested
Between 35kv bus；
S3, starting module multilevel converter: start, using electrical network 35kv busbar voltage, two modularitys dorsad connecting many
Level converter, the modularization multi-level converter being wherein connected with Wind turbines 35kv bus starts mould by DC charging
Block starts；
S4, the high-frequency rectification of control electrical network 35kv bus bar side multilevel converter, make the capacitance voltage of each half-bridge submodule adjust
For designated value, control and follow the tracks of Wind turbines side multilevel converter voltage, realize multilevel converter Wind turbines side output electricity
Pressure and disturbance voltage urefTracing control.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
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| CN201410100721.XA CN103969578B (en) | 2014-03-18 | 2014-03-18 | Device and method for testing power grid adaptability of wind power generating unit |
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| CN201410100721.XA CN103969578B (en) | 2014-03-18 | 2014-03-18 | Device and method for testing power grid adaptability of wind power generating unit |
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| CN107219772B (en) * | 2017-05-23 | 2020-02-18 | 南方电网科学研究院有限责任公司 | Method, device and system for testing function indexes of multi-loop fault suppression and isolation device |
| CN109283465A (en) * | 2018-10-23 | 2019-01-29 | 格力电器（芜湖）有限公司 | A kind of electrical part test method and system |
| CN109193673B (en) * | 2018-10-24 | 2021-07-27 | 云南电网有限责任公司电力科学研究院 | Voltage fluctuation and flicker control method for power grid adaptability detection platform |
| CN110412377A (en) * | 2019-05-14 | 2019-11-05 | 深圳市禾望电气股份有限公司 | A kind of voltage failure of static reactive generator passes through test method |
| CN111239534A (en) * | 2020-03-19 | 2020-06-05 | 广东电网有限责任公司电力科学研究院 | MMC-based high-capacity wind turbine generator system power grid adaptability integrated test system |
| CN111382525B (en) * | 2020-03-24 | 2024-04-05 | 国网河北省电力有限公司沧州供电分公司 | Low-frequency power transmission closed-loop test system and method |
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