CN106100310A - A kind of method and apparatus optimizing voltage source converter soft start-up process - Google Patents
A kind of method and apparatus optimizing voltage source converter soft start-up process Download PDFInfo
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- CN106100310A CN106100310A CN201610461019.5A CN201610461019A CN106100310A CN 106100310 A CN106100310 A CN 106100310A CN 201610461019 A CN201610461019 A CN 201610461019A CN 106100310 A CN106100310 A CN 106100310A
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M1/00—Details of apparatus for conversion
- H02M1/36—Means for starting or stopping converters
Abstract
The invention discloses a kind of method optimizing voltage source converter soft start-up process, including: when the magnitude of voltage of DC bus capacitor rises to the first preset voltage value, control the switch Guan Bi in parallel with charging resistor；When allowing output pwm control signal, generate electric voltage feed forward signal and the sinusoidal modulation signal of variable weight；The electric voltage feed forward signal of described variable weight is added described sinusoidal modulation signal, generates total modulated signal；According to described total modulated signal, generate pwm control signal；Export described pwm control signal to IGBT converter to control the turn-on and turn-off of described IGBT converter, and then control the charging of described DC bus capacitor；When the magnitude of voltage of described DC bus capacitor rises to the second preset voltage value, it is determined that soft start completes.The invention also discloses a kind of device optimizing voltage source converter soft start-up process.Use the present invention, it is possible in the case of power grid environment is severe, it is achieved and the seamlessly transitting of network process, improve the inverter adaptation ability to electrical network.
Description
Technical field
The present invention relates to converter Control field, particularly relate to a kind of side optimizing voltage source converter soft start-up process
Method and device.
Background technology
Inverter is in start-up course, it may appear that large impact electric current thus cause vibration, and Converter DC-side electric capacity
Voltage initial value differs relatively big with voltage set-point, can cause voltage overshoot in startup moment, and then cause unidirectional current to press through punching, make
Become capacitor to damage, even produce blast, so must use soft Starting Technology to the electric current in inverter start-up course in addition
Limit.Wherein, soft start-up process includes pre-charge process and PWM (pulse width modulation: pulse width modulation)
Copped wave charging process.
Owing to there are the electricity supply and use equipment of a large amount of non-linear impedance characteristic in power system, these equipment are to utility network
Harmonic electric current or in utility network produce harmonic voltage, compare relatively rugged environment when inverter is in grid voltage quality
Time middle, there are substantial amounts of low-order harmonic and higher hamonic wave in electrical network, this not only can affect stablizing of Converter DC-side voltage,
The most also can cause DC side overvoltage, have a strong impact on the stable operation of inverter.Prior art uses in PWM copped wave charging process
The technical scheme of the voltage feed-forward control that middle addition is fixing suppresses the voltage ripple of power network impact on DC voltage, wherein,
The fixed voltage feed-forward signal added is unfiltered electric voltage feed forward signal or low-pass filtered device filtered electric voltage feed forward letter
Number.
The present inventor is in implementing the present invention, it may, find prior art Shortcomings, on the one hand, according to unfiltered
Electric voltage feed forward signal, then can only eliminate the impact of the electrical network containing low-order harmonic, it is impossible to eliminate containing the electrical network of higher hamonic wave
Impact, when power grid environment is severe, electrical network may exist a large amount of higher hamonic wave, and terminate in PWM copped wave charging process
When entering the DC voltage voltage stabilizing stage, the frequent fluctuation of line voltage can cause the fluctuation of DC voltage.On the other hand, if adopting
With filtered electric voltage feed forward signal, the impact of the electrical network containing higher hamonic wave can be eliminated, but filtering can cause time delay, this
Individual time delay will be likely longer than the grid-connected disturbance time so that electric voltage feed forward signal can not be offset grid disturbances amount in time and cause
Impacting in short-term, the possible directly trigger protection when impacting excessive, causing cannot be the most grid-connected.
Summary of the invention
The technical problem to be solved is, it is provided that a kind of side optimizing voltage source converter soft start-up process
Method and device, can effectively solve to cause DC voltage to fluctuate owing to containing a large amount of higher hamonic waves in electrical network, and because of right
Electric voltage feed forward signal is filtered the time delay caused, cause cannot be the most grid-connected problem.
In order to solve above-mentioned technical problem, one aspect of the present invention provides and a kind of optimizes that voltage source converter is soft to be opened
The method of dynamic process, comprises the following steps:
When the magnitude of voltage of DC bus capacitor rises to the first preset voltage value, control the switch in parallel with charging resistor and close
Close；
When allowing output pwm control signal, generate electric voltage feed forward signal and the sinusoidal modulation signal of variable weight；Wherein,
The electric voltage feed forward signal of described variable weight is the weighting of unfiltered electric voltage feed forward signal and filtered electric voltage feed forward signal, institute
State unfiltered electric voltage feed forward signal and there is the first weighted value being gradually reduced, described filtered electric voltage feed forward signal have by
Cumulative the second big weighted value；
The electric voltage feed forward signal of described variable weight is added in described sinusoidal modulation signal, generates total modulated signal；
According to described total modulated signal, generate described pwm control signal；
(insulated gate bipolar transistor, insulated gate is double to IGBT to export described pwm control signal
Bipolar transistor) current transformer is to control the turn-on and turn-off of described IGBT converter, and then control filling of described DC bus capacitor
Electricity；
When the magnitude of voltage of described DC bus capacitor rises to the second preset voltage value, it is determined that soft start completes.
Further, described rise to the first preset voltage value when the magnitude of voltage of DC bus capacitor time, control with charging
Before the switch Guan Bi of resistor coupled in parallel, also include:
When the magnitude of voltage of DC bus capacitor is less than the first preset voltage value, forbid exporting pwm control signal to keep
IGBT converter turns off, and controls switch off in parallel with charging resistor so that the power supply signal of electrical grid transmission is flowing through
By the anti-paralleled diode of IGBT converter, described DC bus capacitor is charged after stating charging resistor.
Preferably, rise to the first preset voltage value described when the magnitude of voltage of DC bus capacitor, control and charging resistor
After switch Guan Bi in parallel, also include:
Forbid exporting described pwm control signal, and after the delay time that experience is preset, it is allowed to export described PWM and control
Signal.
Specifically, described feed-forward signal signal generating unit specifically for:
The initial value arranging described first weighted value is 1, and the initial value of described second weighted value is 0；And
Electricity is preset allowing the output described pwm control signal magnitude of voltage to described DC bus capacitor to increase to described second
During pressure value, it is gradually reduced described first weighted value and is gradually increased described second weighted value simultaneously, until described first
Weighted value becomes 0, and described second weighted value becomes 1.
Specifically, described generation sinusoidal modulation signal, specifically include following steps:
Gather the output electric current of inverter, and described output electric current carried out coordinate transform, generates actual watt current with
Actual reactive current；
By poor to default watt current and described actual watt current, generate the first difference signal, and by default
Reactive current and described actual reactive current are poor, generate the second difference signal；
Described first difference signal and described second difference signal are carried out PI regulation respectively, generate the first modulated signal and
Second modulated signal；
Described first modulated signal and described second modulated signal are carried out inverse transformation, generates described sinusoidal modulation signal.
Further, the total modulated signal of described basis, generate described pwm control signal, particularly as follows:
Described total modulated signal is compared with triangular wave, generates described pwm control signal.
Further, the described pwm control signal of described output is to IGBT converter leading with the described IGBT converter of control
Lead to and turn off, particularly as follows:
Export described pwm control signal to drive amplification circuit so that described pwm control signal is carried out power amplification, by warp
Pwm control signal after overpower amplification controls the turn-on and turn-off of described IGBT converter.
In order to solve the problems referred to above, another aspect of the present invention provides a kind of optimization voltage source converter soft start
The device of process, including:
Guan Bi module, for when the magnitude of voltage of DC bus capacitor rises to the first preset voltage value, controls and charged electrical
The switch Guan Bi that resistance is in parallel；
Pre-modulated signal generation module, for when allowing output pwm control signal, generates the electric voltage feed forward letter of variable weight
Number and sinusoidal modulation signal；Wherein, after the electric voltage feed forward signal of described variable weight is unfiltered electric voltage feed forward signal and filtering
The weighting of electric voltage feed forward signal, described unfiltered electric voltage feed forward signal has the first weighted value being gradually reduced, described filter
Electric voltage feed forward signal after ripple has the second weighted value being gradually increased；And described pre-modulated signal generation module includes feedforward letter
Number signal generating unit and sinusoidal modulation signal signal generating unit；
Total modulated signal generation module, for adding described sinusoidal modulation signal by the electric voltage feed forward signal of described variable weight
In, generate total modulated signal；
Control signal generation module, for according to described total modulated signal, generates described pwm control signal；
Control module, for exporting described pwm control signal to IGBT converter to control leading of described IGBT converter
Lead to and turn off, and then controlling the charging of described DC bus capacitor；
Soft-start module, for when the magnitude of voltage of described DC bus capacitor rises to the second preset voltage value, it is determined that soft
Startup completes.
Further, the device of described optimization voltage source converter soft start-up process also includes:
Pre-charge module, for when the magnitude of voltage of DC bus capacitor is less than the first preset voltage value, forbids exporting PWM control
Signal processed is to keep IGBT converter to turn off, and controls switch off in parallel with charging resistor so that the power supply of electrical grid transmission
Described DC bus capacitor is charged after flowing through described charging resistor by signal by the anti-paralleled diode of IGBT converter.
Further, the device of described optimization voltage source converter soft start-up process also includes:
Time delay module, is used for forbidding exporting described pwm control signal, and after the delay time that experience is preset, it is allowed to defeated
Go out described pwm control signal.
Further, described feed-forward signal signal generating unit specifically for:
The initial value arranging described first weighted value is 1, and the initial value of described second weighted value is 0；And
Electricity is preset allowing the output described pwm control signal magnitude of voltage to described DC bus capacitor to increase to described second
During pressure value, it is gradually reduced described first weighted value and is gradually increased described second weighted value simultaneously, until described first
Weighted value becomes 0, and described second weighted value becomes 1.
Specifically, described sinusoidal modulation signal signal generating unit includes:
Coordinate transform subelement, gathers the output electric current of inverter, and described output electric current is carried out coordinate transform, generates
Actual watt current and actual reactive current；
Make difference subelement, for by poor to default watt current and described actual watt current, generate the first difference letter
Number, and by poor to default reactive current and described actual reactive current, generate the second difference signal；
PI (proportional integral, proportional integral) regulon unit, for will described first difference signal with
Described second difference signal carries out PI regulation respectively, generates the first modulated signal and the second modulated signal；
Inverse transformation subelement, for described first modulated signal and described second modulated signal are carried out inverse transformation, generates
Described sinusoidal modulation signal.
Further, described control signal generation module specifically for:
Described total modulated signal is compared with triangular wave, generates described pwm control signal.
Further, described control module specifically for:
Export described pwm control signal to drive amplification circuit so that described pwm control signal is carried out power amplification, by warp
Pwm control signal after overpower amplification controls the turn-on and turn-off of described IGBT converter.
Implement the present invention, have the advantages that
The present invention, by adding the electric voltage feed forward signal of variable weight in sinusoidal modulation wave, can effectively eliminate containing high order humorous
Affecting and adapting to the electrical network containing various harmonic waves of the electrical network of ripple, is effectively increased the stability of DC voltage, makes grid-connected
Electric current is more preferable, and then realizes and the seamlessly transitting of network process.Further, can solve when having just enter into PWM copped wave charging process, by
Cause electric voltage feed forward signal can not offset grid disturbances amount in time in the time delay that electric voltage feed forward signal is filtered cause,
And then dash current in short-term occurs, when dash current is excessive may direct trigger protection, cause can not be grid-connected problem, effectively
Improve grid-connected success rate.
Accompanying drawing explanation
Fig. 1 is the flow process signal of a kind of method optimizing voltage source converter soft start-up process in the embodiment of the present invention 1
Figure；
Fig. 2 be the embodiment of the present invention 1 optimize voltage source converter soft start-up process method in generate Sine Modulated
The schematic flow sheet of signal；
Fig. 3 is the flow process signal of a kind of method optimizing voltage source converter soft start-up process in the embodiment of the present invention 2
Figure；
Fig. 4 is the structural representation of a kind of device optimizing voltage source converter soft start-up process in the embodiment of the present invention 3
Figure；
Fig. 5 be the embodiment of the present invention 3 the device optimizing voltage source converter soft start-up process in pre-modulated signal raw
Become the structural representation of module；
Fig. 6 be the embodiment of the present invention 3 optimize voltage source converter soft start-up process device in sinusoidal modulation signal
The structural representation of signal generating unit；
Fig. 7 is the structural representation of a kind of device optimizing voltage source converter soft start-up process in the embodiment of the present invention 4
Figure；
Fig. 8 is the topological structure schematic diagram of a kind of three grid-connected inverters of level.
Detailed description of the invention
Below in conjunction with the accompanying drawing in the embodiment of the present invention, the technical scheme in the embodiment of the present invention is carried out clear, complete
Describe, it is clear that described embodiment is only a part of embodiment of the present invention rather than whole embodiments wholely.Based on
Embodiment in the present invention, it is every other that those of ordinary skill in the art are obtained under not making creative work premise
Embodiment, broadly falls into the scope of protection of the invention.
In all embodiments of the invention, unfiltered electric voltage feed forward signal is that line voltage is multiplied by default feedforward system
Number, filtered electric voltage feed forward signal refers to the electricity that unfiltered electric voltage feed forward signal obtains after low pass filter filters
Pressure feed-forward signal.
See Fig. 1, be the flow process of a kind of method optimizing voltage source converter soft start-up process in the embodiment of the present invention 1
Schematic diagram.
The embodiment of the present invention provides a kind of method optimizing voltage source converter soft start-up process, comprises the following steps:
Step S11, when the magnitude of voltage of DC bus capacitor rises to the first preset voltage value, control in parallel with charging resistor
Switch Guan Bi；
Wherein, described switch is relay or thyristor, rises to for the magnitude of voltage at described DC bus capacitor
During described first preset voltage value, it is shorted out described charging resistor；Wherein, described charging resistor plays metering function.
It should be noted that in embodiments of the present invention, pre-charge process is that the magnitude of voltage of described DC bus capacitor is from zero
Rise to described first preset voltage value, and close switch this process in parallel with described charging resistor.PWM copped wave was charged
Journey be allow to export described pwm control signal to the magnitude of voltage of described DC bus capacitor rise to described second preset voltage value this
One process.
It should be noted that in embodiments of the present invention, after controlling the switch Guan Bi in parallel with described charging resistor, directly
Connect permission and export described pwm control signal (i.e. opening pulsed drive), enter described PWM copped wave charging process, and by PWM control
Signal controls the turn-on and turn-off of IGBT converter, and then controls the charging of described DC bus capacitor.
It should be noted that when the magnitude of voltage of described DC bus capacitor is less than described first preset voltage value, electrical network profit
Charge to described DC bus capacitor with the anti-paralleled diode of described IGBT converter through described charging resistor.In described precharge
During, the magnitude of voltage of described DC bus capacitor to be raised to described first preset voltage value from above freezing, typically, described was pre-charged
Journey at most can only make the magnitude of voltage of described DC bus capacitor rise to the peak value of line voltage, such as at three-phase three-wire system 380V electricity
Off the net, described pre-charge process can make the magnitude of voltage of described DC bus capacitor rise to about 540V, and the most described first presets
Magnitude of voltage not can exceed that 540V.Preferably, the span of described first preset voltage value is 500V～520V, real in the present invention
Execute in example, set described first preset voltage value as 520V.
Step S12, when allowing output pwm control signal, the electric voltage feed forward signal and the Sine Modulated that generate variable weight are believed
Number；Wherein, the electric voltage feed forward signal of described variable weight is unfiltered electric voltage feed forward signal and filtered electric voltage feed forward signal
Weighting, described unfiltered electric voltage feed forward signal has the first weighted value being gradually reduced, described filtered electric voltage feed forward
Signal has the second weighted value being gradually increased；
Specifically, the electric voltage feed forward signal of described generation variable weight, particularly as follows:
The initial value arranging described first weighted value is 1, and the initial value of described second weighted value is 0；And
Electricity is preset allowing the output described pwm control signal magnitude of voltage to described DC bus capacitor to increase to described second
During pressure value, it is gradually reduced described first weighted value and is gradually increased described second weighted value simultaneously, until described first
Weighted value becomes 0, and described second weighted value becomes 1.
It should be noted that in whole PWM copped wave charging process, by described unfiltered electric voltage feed forward signal and described
Filtered electric voltage feed forward signal is added simultaneously in described sinusoidal modulation signal.Further, described unfiltered electric voltage feed forward letter
Number the first weighted value and the change frequency of the second weighted value of described filtered electric voltage feed forward signal be to be according to preset
Total duration of system duration interrupt cycle and described PWM copped wave charging process determines, it is desirable to cut at described PWM for must assure that
Ripple charging process terminates, before entering the DC voltage voltage stabilizing stage, and the second weighted value of described filtered electric voltage feed forward signal
Become 1.Wherein, total duration of described PWM copped wave charging process is by charging current value (the most described default watt current value)
Determining, therefore, in embodiments of the present invention, presetting described system break cycle duration is 50us, presets described watt current value
For 0.4A, and set each two and change the most described first weighted value and described second weighted value interrupt cycle, wherein said
First weighted value and described second weighted value change simultaneously.
Wherein, the concrete grammar of described generation sinusoidal modulation signal is as in figure 2 it is shown, specifically include following steps:
Step S121, gathering the output electric current of inverter, and described output electric current is carried out coordinate transform, generating actual has
Merit electric current and actual reactive current；
Wherein, for three-phase three-wire system three-level converter, described coordinate is transformed to ABC-DQ coordinate transform；Described ABC-
DQ coordinate transform is that the three-phase alternating current signal of telecommunication under three-phase static coordinate system is transformed into the unidirectional current under biphase rotating coordinate system
Signal, to realize decoupling.Owing to three-phase alternating current side is time-varying of ac, and there is the strongest coupling, therefore, each phase between each phase
Can influence each other, be unfavorable for Control System Design.Therefore, time-varying of ac is converted into constant when stable state, by three-phase alternating current
Signal becomes to gain merit by described ABC-DQ coordinate transform, and (actual watt current and reality are idle with idle biphase DC signal
Electric current) so that gaining merit in system can control respectively with idle, improve high efficiency and reliability that system controls.
It addition, for three-phase four-wire system three-level converter, described coordinate is transformed to ABC-DQ0 coordinate transform, and its principle is with described
The principle of ABC-DQ coordinate transform is roughly the same, does not repeats them here.
Step S122, by poor to default watt current and described actual watt current, generate the first difference signal, and
By poor to default reactive current and described actual reactive current, generate the second difference signal；
Alternatively, described default reactive current value is zero, and described default watt current value is estimated according to systematic function；
Wherein, described default watt current determines the speed of charging, and the described the biggest charging of default watt current is the fastest, but charging
Speed can not can not should select a moderate value, in embodiments of the present invention, by described default meritorious electricity the soonest too slowly
Stream is set to 0.4A.
Step S123, described first difference signal and described second difference signal are carried out respectively PI regulation, generate first
Modulated signal and the second modulated signal；
Wherein, described PI regulation is to constitute control deviation with real output value, by deviation according to set-point (i.e. preset value)
Ratio (P) and integration (I) by linear combination constitute controlled quentity controlled variable, controlled device is controlled.
Step S124, described first modulated signal and described second modulated signal are carried out inverse transformation, generate described sine
Modulated signal.
Wherein, for three-phase three-wire system three-level converter, described contravariant is changed to DQ-ABC coordinate transform；The most biphase rotation
Meritorious and idle component under coordinate system is by meritorious and idle modulated signal (the i.e. institute needed for generation system after described PI regulation
State the first modulated signal and the second modulated signal), described meritorious and idle modulated signal is after described DQ-ABC coordinate transform
The three-phase alternating current modulated signal (the most described sinusoidal modulation signal) under three-phase static coordinate system can be become.It addition, for three-phase four
Line three-level converter, described contravariant is changed to DQ0-ABC coordinate transform, principle and described DQ-ABC coordinate transform substantially phase
With, do not repeat them here.
It should be noted that the sinusoidal modulation signal generating mode described in S121～S124 is only in the present invention
Individual embodiment, generates the mode of sinusoidal modulation signal when i.e. using constant current charge method；And in actual applications, PWM copped wave
Charging process can also use voltage to give and be stepped up method and variable PI parameter method；
When being stepped up method using voltage to give, default DC voltage value starts to be incremented by after precharge, and often
The DC voltage value preset in the individual primitive period is all being gradually increased, and reaches final after the primitive period of experience predetermined number
Value.Wherein, the step generating sinusoidal modulation signal is, by predetermined DC side magnitude of voltage and the actual DC side magnitude of voltage detected
Differing from, be input in Voltage loop by described difference signal, described difference signal is calculated and exports watt current by Voltage loop,
Described watt current participates in the calculating of electric current loop, and further, electric current loop exports described sinusoidal modulation signal.
When using variable PI parameter method, when described DC voltage value is less than preset value, the PI ginseng of Voltage loop actuator
Number chooses less value, with when DC voltage is relatively low, slows down the rate of climb and the error accumulation of DC voltage, reduces super
Tune amount；Then it is gradually increased PI parameter, is finally reached DC voltage voltage stabilizing and controls the PI parameter in stage, electric current loop during this
Output be described sinusoidal modulation signal, wherein, Voltage loop is output as watt current, and described watt current participates in electric current loop
Calculate.
Step S13, the electric voltage feed forward signal of described variable weight is added in described sinusoidal modulation signal, generate and always modulate letter
Number；
Step S14, according to described total modulated signal, generate described pwm control signal；
Specifically, step S14 particularly as follows:
Described total modulated signal is compared with triangular wave, generates described pwm control signal.
It should be noted that according to total modulated signal, generate this process of described pwm control signal, it is simply that by sine
Ripple is converted to the process of square wave.
Wherein, three level triangle wave modulation are to be developed by two level triangle wave modulation, described and triangle
Ripple compares and refers to use two equal in magnitude and that phase place is identical triangular carriers, is divided into upper and lower two-layer and carries out stacking,
Two groups of carrier waves are symmetrically distributed in the positive-negative half-cycle of same modulating wave, are modulated with sinusoidal modulation wave (i.e. total modulated signal),
Sampling instant exports different level according to sinusoidal modulation wave from the comparative result of upper and lower carrier wave.Further, for the three level changes of current
For device, according to two groups of triangular carrier phase relations, carrier wave homophase PWM and the anti-phase PWM of carrier wave can be divided into, two kinds
Modulation algorithm is completely the same, and when the positive half-wave of sinusoidal modulation wave is more than upper layer carrier, output level is+1；Work as sinusoidal modulation wave
Negative half wave amplitude less than lower floor's carrier wave time, output level is-1；Remaining is 0.It addition, for two level converters, then
Only+1 exports situation with-1 two kind, and principle is roughly the same with three level conditions, does not repeats them here.
Wherein, carrier wave homophase PWM is that the triangular carrier that two groups of amplitudes of employing are identical with phase place is divided into upper and lower two-layer, point
It is not symmetrically distributed in the positive and negative half-wave of same modulating wave.The anti-phase PWM of carrier wave is that lower carrier wave becomes the load symmetrical with upper carrier wave
Ripple, equal in magnitude, opposite in phase.Consistent with homophase carrier wave stacking to the positive half-wave of sinusoidal modulation wave；And modulating wave is born
Half cycle, due to the difference of carrier wave, turns on and turns off sequential and change.
It should be noted that in the embodiment of the present invention, use the method for triangle wave modulation to generate pwm control signal,
It is only one of which embodiment, it is also possible to use other modulator approaches to generate pwm control signal, such as the modulation of stagnant ring and space
Vector Modulation etc..
Step S15, export described pwm control signal to IGBT converter to control the conducting of described IGBT converter and pass
Disconnected, and then control the charging of described DC bus capacitor；
Specifically, step S15 particularly as follows:
Export described pwm control signal to drive amplification circuit so that described pwm control signal is carried out power amplification, by warp
Pwm control signal after overpower amplification controls the turn-on and turn-off of described IGBT converter.
It should be noted that described DC bus capacitor needs to absorb active power could rise high voltage, in described PWM copped wave
In charging process, being to be charged by given less watt current, the turn-on and turn-off of described IGBT converter are formed
Current path, makes described DC bus capacitor absorb active power all the time, when the voltage of described DC bus capacitor rises to described
During two preset voltage value, terminate soft start.After soft start terminates, enter DC voltage voltage stabilizing and control stage, described DC side electricity
Hold and carry out meritorious energy exchange with electrical network, with keep DC voltage stable (the most described DC voltage is less than described second
During preset voltage value, absorb the active power of electrical network；Higher than described second preset voltage value, discharge active power to electrical network).
It addition, for three-phase three-wire system three-level converter, the described pwm control signal of described output i.e. exports 12 road PWM
Control signal, to control the turn-on and turn-off of described IGBT converter, and then controls the charging of DC bus capacitor.
Alternatively, drive amplification circuit can be special driving module 2SC0435T.
Step S16, when the magnitude of voltage of described DC bus capacitor rises to the second preset voltage value, it is determined that soft start is complete
Become.
In soft start-up process, the initial voltage value of described DC bus capacitor is zero, the magnitude of voltage of described DC bus capacitor
The second preset voltage value is gradually risen to from zero.Wherein, described second preset voltage value is that the size according to line voltage is sentenced
The stationary value of disconnected DC voltage, such as, under 380V electrical network, DC voltage to control at more than 720V.Therefore, at this
In inventive embodiments, described second preset value can be set to 800V.
Fig. 3 is the flow process signal of a kind of method optimizing voltage source converter soft start-up process in the embodiment of the present invention 2
Figure, the embodiment of the present invention comprises the following steps:
Step S21, when DC bus capacitor magnitude of voltage less than the first preset voltage value time, forbid export pwm control signal
To keep IGBT converter to turn off, and control switch off in parallel with charging resistor so that the power supply signal of electrical grid transmission exists
By the anti-paralleled diode of IGBT converter, described DC bus capacitor is charged after flowing through described charging resistor.
It should be noted that described IGBT converter can include multiple igbt transistor, such as, at three-level converter
In, one has three groups of igbt transistors, and the most often group has 4.Herein, forbid described in exporting pwm control signal to keep described
IGBT converter turns off, and refers in described IGBT converter each igbt transistor all in off state.
It should be noted that when the magnitude of voltage of described DC bus capacitor is less than described first preset voltage value, electrical network profit
Charge to described DC bus capacitor with the anti-paralleled diode of described IGBT converter through described charging resistor.In described precharge
During, the magnitude of voltage of described DC bus capacitor to be raised to described first preset voltage value from above freezing, typically, described was pre-charged
Journey at most can only make the magnitude of voltage of described DC bus capacitor rise to the peak value of line voltage, such as at three-phase three-wire system 380V electricity
Off the net, described pre-charge process can make the magnitude of voltage of described DC bus capacitor rise to about 540V, and the most described first presets
Magnitude of voltage not can exceed that 540V.Preferably, the span of described first preset voltage value is 500V～520V, real in the present invention
Execute in example, set described first preset voltage value as 520V.
Step S22, when the magnitude of voltage of described DC bus capacitor rises to described first preset voltage value, control with described
The switch Guan Bi that charging resistor is in parallel；
Step S23, forbid exporting described pwm control signal, and after the delay time that experience is preset, it is allowed to output is described
Pwm control signal.
Alternatively, in embodiments of the present invention, described default delay time is set to 0.7s.
It should be noted that in embodiments of the present invention, described pre-charge process is the magnitude of voltage of described DC bus capacitor
It is raised to described first preset voltage value from above freezing, closes the switch in parallel with described charging resistor, and experienced described default
This process of delay time.Described PWM copped wave charging process is for allowing to export described pwm control signal to described DC bus capacitor
Magnitude of voltage rise to described this process of second preset voltage value.
It should be noted that in embodiments of the present invention, after controlling the switch Guan Bi in parallel with described charging resistor, in institute
State in default delay time the power supply signal of electrical grid transmission directly by the anti-paralleled diode of IGBT converter to DC side
Electric capacity charges, and to improve charging rate and to make described DC voltage raise further, does for described PWM copped wave charging process
Prepare.
Step S24, when allowing to export described pwm control signal, the electric voltage feed forward signal generating variable weight is adjusted with sinusoidal
Signal processed；Wherein, the electric voltage feed forward signal of described variable weight is unfiltered electric voltage feed forward signal and filtered electric voltage feed forward
The weighting of signal, described unfiltered electric voltage feed forward signal has the first weighted value being gradually reduced, described filtered voltage
Feed-forward signal has the second weighted value being gradually increased.
Specifically, generate the electric voltage feed forward signal of described variable weight particularly as follows:
The initial value arranging described first weighted value is 1, and the initial value of described second weighted value is 0；And
Electricity is preset allowing the output described pwm control signal magnitude of voltage to described DC bus capacitor to increase to described second
During pressure value, it is gradually reduced described first weighted value and is gradually increased described second weighted value simultaneously, until described first
Weighted value becomes 0, and described second weighted value becomes 1.
Wherein, the concrete grammar of described generation sinusoidal modulation signal is as in figure 2 it is shown, specifically include following steps:
Step S241, gathering the output electric current of inverter, and described output electric current is carried out coordinate transform, generating actual has
Merit electric current and actual reactive current；
Step S242, by poor to default watt current and described actual watt current, generate the first difference signal, and
By poor to default reactive current and described actual reactive current, generate the second difference signal；
Step S243, described first difference signal and described second difference signal are carried out respectively PI regulation, generate first
Modulated signal and the second modulated signal；
Step S244, described first modulated signal and described second modulated signal are carried out inverse transformation, generate described sine
Modulated signal.
Step S25, the electric voltage feed forward signal of described variable weight is added in described sinusoidal modulation signal, generate and always modulate letter
Number；
Step S26, according to described total modulated signal, generate described pwm control signal；
Specifically, step S26 particularly as follows:
Described total modulated signal is compared with triangular wave, generates described pwm control signal.
Step S27, export described pwm control signal to IGBT converter to control the conducting of described IGBT converter and pass
Disconnected so that described DC bus capacitor is directly charged by the power supply signal of described electrical grid transmission by described IGBT converter；
Specifically, step S27 particularly as follows:
Export described pwm control signal to IGBT converter to control the turn-on and turn-off of described IGBT converter, and then
Control the charging of described DC bus capacitor；
Step S28, when the magnitude of voltage of described DC bus capacitor rises to the second preset voltage value, it is determined that soft start is complete
Become.
It should be noted that at the end of described pre-charge process, if the switch in parallel with described charging resistor is closed
Pulsed drive (i.e. allowing to export described pwm control signal) is directly opened after conjunction, issuable the biggest during described switch Guan Bi
Dash current, this can affect the startup of PWM copped wave charging process of next stage.In embodiments of the present invention, Guan Bi and institute
State the switch that charging resistor is in parallel, and after experiencing described default delay time, then open pulsed drive, so that described switch
The dash current produced during Guan Bi can be buffered, and then described PWM copped wave charging process can be started smoothly, can effectively carry
High grid-connected success rate.
The embodiment of the present invention also provides for a kind of device optimizing voltage source converter soft start-up process, as shown in Figure 4, is
The structural representation of a kind of device optimizing voltage source converter soft start-up process in the embodiment of the present invention 3, including:
Guan Bi module 11, for when the magnitude of voltage of DC bus capacitor rises to the first preset voltage value, controls and charging
The switch Guan Bi of resistor coupled in parallel；
Pre-modulated signal generation module 12, for when allowing output pwm control signal, generating the electric voltage feed forward of variable weight
Signal and sinusoidal modulation signal；Wherein, the electric voltage feed forward signal of described variable weight is unfiltered electric voltage feed forward signal and filtering
After the weighting of electric voltage feed forward signal, described unfiltered electric voltage feed forward signal has the first weighted value being gradually reduced, described
Filtered electric voltage feed forward signal has the second weighted value being gradually increased；And described pre-modulated signal generation module includes feedforward
Signal signal generating unit 121 and sinusoidal modulation signal signal generating unit 122, as shown in Figure 5；
Total modulated signal generation module 13, for adding described Sine Modulated letter by the electric voltage feed forward signal of described variable weight
In number, generate total modulated signal；
Control signal generation module 14, for according to described total modulated signal, generates described pwm control signal；
Control module 15, for exporting described pwm control signal to IGBT converter to control described IGBT converter
Turn-on and turn-off, and then control the charging of described DC bus capacitor；
Soft-start module 16, for when the magnitude of voltage of described DC bus capacitor rises to the second preset voltage value, it is determined that
Soft start completes.
Wherein, described feed-forward signal signal generating unit 121 specifically for:
The initial value arranging described first weighted value is 1, and the initial value of described second weighted value is 0；And
In the process allowing the output pwm control signal magnitude of voltage to DC bus capacitor to increase to the second preset voltage value
In, it is gradually reduced described first weighted value and is gradually increased described second weighted value simultaneously, until described first weighted value becomes
0, described second weighted value becomes 1.
Wherein, described sinusoidal modulation signal signal generating unit 122, see Fig. 6, specifically include:
Coordinate transform subelement 1221, gathers the output electric current of inverter, and described output electric current is carried out coordinate transform,
Generate actual watt current and actual reactive current；
Make difference subelement 1222, for by poor to default watt current and described actual watt current, generate first poor
Value signal, and by poor to default reactive current and described actual reactive current, generate the second difference signal；
PI regulon unit 1223, for carrying out PI tune respectively by described first difference signal and described second difference signal
Joint, generates the first modulated signal and the second modulated signal；
Inverse transformation subelement 1224, for described first modulated signal and described second modulated signal are carried out inverse transformation,
Generate described sinusoidal modulation signal.
Wherein, described control signal generation module 14 specifically for described total modulated signal is compared with triangular wave,
Generate pwm control signal.
Wherein, described control module 15 is specifically for exporting described pwm control signal to drive amplification circuit with to described
Pwm control signal carries out power amplification, the pwm control signal after power amplification control the conducting of described IGBT converter
And shutoff.
See Fig. 7, be the structure of a kind of device optimizing voltage source converter soft start-up process in the embodiment of the present invention 4
Schematic diagram, including:
Pre-charge module 21, for when the magnitude of voltage of DC bus capacitor is less than the first preset voltage value, forbids exporting PWM
Control signal is to keep IGBT converter to turn off, and controls switch off in parallel with charging resistor so that the electricity of electrical grid transmission
DC bus capacitor is charged after flowing through charging resistor by source signal by the anti-paralleled diode of IGBT converter.
Guan Bi module 22, for when the magnitude of voltage of DC bus capacitor rises to the first preset voltage value, controls and charging
The switch Guan Bi of resistor coupled in parallel；
Time delay module 23, is used for forbidding exporting described pwm control signal, and after the delay time that experience is preset, it is allowed to
Export described pwm control signal.
Pre-modulated signal generation module 24, for when allowing output pwm control signal, generating the electric voltage feed forward of variable weight
Signal and sinusoidal modulation signal；Wherein, the electric voltage feed forward signal of described variable weight is unfiltered electric voltage feed forward signal and filtering
After the weighting of electric voltage feed forward signal, described unfiltered electric voltage feed forward signal has the first weighted value being gradually reduced, described
Filtered electric voltage feed forward signal has the second weighted value being gradually increased；And described pre-modulated signal generation module includes feedforward
Signal signal generating unit and sinusoidal modulation signal signal generating unit；
Total modulated signal generation module 25, for adding described Sine Modulated letter by the electric voltage feed forward signal of described variable weight
In number, generate total modulated signal；
Control signal generation module 26, for according to described total modulated signal, generates described pwm control signal；
Control module 27, for exporting described pwm control signal to IGBT converter to control described IGBT converter
Turn-on and turn-off, and then control the charging of described DC bus capacitor；
Soft-start module 28, for when the magnitude of voltage of described DC bus capacitor rises to the second preset voltage value, it is determined that
Soft start completes.
Wherein, described feed-forward signal signal generating unit specifically for:
The initial value arranging described first weighted value is 1, and the initial value of described second weighted value is 0；And
In the process allowing the output pwm control signal magnitude of voltage to DC bus capacitor to increase to the second preset voltage value
In, it is gradually reduced described first weighted value and is gradually increased described second weighted value simultaneously, until described first weighted value becomes
0, described second weighted value becomes 1.
Wherein, described sinusoidal modulation signal signal generating unit, specifically include:
Coordinate transform subelement, gathers the output electric current of inverter, and described output electric current is carried out coordinate transform, generates
Actual watt current and actual reactive current；
Make difference subelement, for by poor to default watt current and described actual watt current, generate the first difference letter
Number, and by poor to default reactive current and described actual reactive current, generate the second difference signal；
PI regulon unit, for described first difference signal and described second difference signal are carried out PI regulation respectively,
Generate the first modulated signal and the second modulated signal；
Inverse transformation subelement, for described first modulated signal and described second modulated signal are carried out inverse transformation, generates
Described sinusoidal modulation signal.
Wherein, described control signal generation module 26 specifically for described total modulated signal is compared with triangular wave,
Generate pwm control signal.
Wherein, described control module 27 is specifically for exporting described pwm control signal to drive amplification circuit with to described
Pwm control signal carries out power amplification, the pwm control signal after power amplification control the conducting of described IGBT converter
And shutoff.
It should be noted that at the end of described pre-charge process, if the switch in parallel with described charging resistor is closed
Pulsed drive (i.e. allowing output pwm control signal), the biggest issuable rushing during described switch Guan Bi is directly opened after conjunction
Hitting electric current, this can affect the startup of PWM copped wave charging process of next stage.In embodiments of the present invention, increase time delay module,
For closing the switch in parallel with described charging resistor, and after the delay time that experience is preset, then open pulsed drive, so that
The dash current produced during described switch Guan Bi can be buffered, and then described PWM copped wave charging process can be started smoothly,
Grid-connected success rate can be effectively improved.
See Fig. 8, in the case of three-phase three-wire system, as a example by the topological structure of the three grid-connected inverters of level, real to the present invention
Execute example to be further detailed.
It should be noted that the typical circuit topology of this three-level converter includes electric network source, charging resistor, relay
Device, LCL filter, IGBT converter, DC bus capacitor, drive circuit, signal conditioning circuit and controller.
In pre-charge process, relay remains open, and block drives, the power supply signal charged resistance limit of electrical grid transmission
After stream, being charged to DC bus capacitor by the anti-paralleled diode of IGBT converter, controller judges DC bus capacitor
When magnitude of voltage is more than or equal to the first preset value, controls relay Guan Bi, and carry out the time delay preset.
In PWM copped wave charging process, controller controls to open driving, and gives less watt current and zero idle electricity
Stream, signal conditioning circuit gathers the output electric current of inverter and is input in controller, and described output electric current is carried out by controller
Process makes it generate actual watt current and actual reactive current after ABC-DQ coordinate transform, and by given meritorious electricity
Stream and actual watt current make difference and zero given reactive current and actual reactive current makees after the recovery, generate the first difference signal
With the second difference signal, described first difference signal and described second difference signal are carried out PI regulation, generate meritorious modulation letter
Number and idle modulated signal (the i.e. first modulated signal and the second modulated signal), will described meritorious modulated signal and idle modulation letter
Generate three-phase modulations signal (i.e. sinusoidal modulation signal) after number carrying out inverse transformation, the electric voltage feed forward signal of described variable weight is added
In three-phase modulations signal, form total modulating wave (i.e. total modulated signal), after described total modulating wave and triangular wave are compared, raw
Become 12 road pwm control signals, 12 road pwm control signals are input to after drive amplification circuit carries out power amplification, then by passing through
Power amplification Hou 12 road pwm control signal controls the turn-on and turn-off of 3 groups of IGBT converter (often group 4, totally 12) respectively,
To realize the power supply signal of electrical grid transmission to DC bus capacitor charging so that the voltage of DC bus capacitor rises to second and presets
Value.
It should be noted that in whole soft start-up process, signal conditioning circuit needs Real-time Collection line voltage, the change of current
The signals such as output electric current, the voltage of DC bus capacitor and the relay status of device are also entered in controller.
It addition, start (when i.e. allowing output pwm control signal) to DC capacitor voltage in PWM copped wave charging process
It is raised to the second preset value during this, is simultaneously introduced unfiltered electric voltage feed forward signal and filtered electric voltage feed forward signal,
Wherein, the initial value arranging described first weighted value is 1, and the initial value of described second weighted value is 0；And in the process by
The least described first weighted value is also gradually increased described second weighted value, until described first weighted value becomes 0, described second
Weighted value becomes 1.
The present invention, by adding the electric voltage feed forward signal of variable weight in sinusoidal modulation wave, can effectively eliminate containing high order humorous
Affecting and adapting to the electrical network containing various harmonic waves of the electrical network of ripple, is effectively increased the stability of DC voltage, makes grid-connected
Electric current is more preferable, and then realizes and the seamlessly transitting of network process.Further, can solve when having just enter into PWM copped wave charging process, by
Cause electric voltage feed forward signal can not offset grid disturbances amount in time in the time delay that electric voltage feed forward signal is filtered cause,
And then dash current in short-term occurs, when dash current is excessive may direct trigger protection, cause can not be grid-connected problem, effectively
Improve grid-connected success rate.
The above is the preferred embodiment of the present invention, it is noted that for those skilled in the art
For, under the premise without departing from the principles of the invention, it is also possible to make some improvement and deformation, these improve and deformation is also considered as
Protection scope of the present invention.
Claims (10)
1. the method optimizing voltage source converter soft start-up process, it is characterised in that comprise the following steps:
When the magnitude of voltage of DC bus capacitor rises to the first preset voltage value, control the switch Guan Bi in parallel with charging resistor；
When allowing output pwm control signal, generate electric voltage feed forward signal and the sinusoidal modulation signal of variable weight；Wherein, described
The electric voltage feed forward signal of variable weight is the weighting of unfiltered electric voltage feed forward signal and filtered electric voltage feed forward signal, described not
The electric voltage feed forward signal of filtering has the first weighted value being gradually reduced, and described filtered electric voltage feed forward signal has and gradually increases
The second big weighted value；
The electric voltage feed forward signal of described variable weight is added in described sinusoidal modulation signal, generates total modulated signal；
According to described total modulated signal, generate described pwm control signal；
Export described pwm control signal to IGBT converter to control the turn-on and turn-off of described IGBT converter, and then control
The charging of described DC bus capacitor；
When the magnitude of voltage of described DC bus capacitor rises to the second preset voltage value, it is determined that soft start completes.
2. the method optimizing voltage source converter soft start-up process as claimed in claim 1, it is characterised in that work as described
When the magnitude of voltage of DC bus capacitor rises to the first preset voltage value, before controlling the switch Guan Bi in parallel with charging resistor, also
Including:
When the magnitude of voltage of DC bus capacitor is less than the first preset voltage value, forbid exporting pwm control signal to keep IGBT to become
Stream device turns off, and controls switch off in parallel with charging resistor so that the power supply signal of electrical grid transmission is flowing through described charging
By the anti-paralleled diode of IGBT converter, described DC bus capacitor is charged after resistance；
Rise to the first preset voltage value described when the magnitude of voltage of DC bus capacitor, control the switch in parallel with charging resistor and close
After conjunction, also include:
Forbid exporting described pwm control signal, and after the delay time that experience is preset, it is allowed to export described pwm control signal.
3. the method optimizing voltage source converter soft start-up process as claimed in claim 1 or 2, it is characterised in that described
Generate the electric voltage feed forward signal of variable weight, particularly as follows:
The initial value arranging described first weighted value is 1, and the initial value of described second weighted value is 0；And
Described second preset voltage value is increased to allowing the output described pwm control signal magnitude of voltage to described DC bus capacitor
During, it is gradually reduced described first weighted value and is gradually increased described second weighted value simultaneously, until described first weight
Value becomes 0, and described second weighted value becomes 1.
4. the method optimizing voltage source converter soft start-up process as claimed in claim 1 or 2, it is characterised in that described
Generate sinusoidal modulation signal, specifically include following steps:
Gather the output electric current of inverter, and described output electric current is carried out coordinate transform, generate actual watt current and reality
Reactive current；
By poor to default watt current and described actual watt current, generate the first difference signal, and by default idle
Electric current and described actual reactive current are poor, generate the second difference signal；
Described first difference signal and described second difference signal are carried out PI regulation respectively, generates the first modulated signal and second
Modulated signal；
Described first modulated signal and described second modulated signal are carried out inverse transformation, generates described sinusoidal modulation signal.
5. the method optimizing voltage source converter soft start-up process as claimed in claim 1 or 2, it is characterised in that described
According to total modulated signal, generate described pwm control signal, particularly as follows:
Described total modulated signal is compared with triangular wave, generates described pwm control signal；
The described pwm control signal of described output to IGBT converter with control described IGBT converter turn-on and turn-off, specifically
For:
Export described pwm control signal to drive amplification circuit so that described pwm control signal is carried out power amplification, by through merit
Pwm control signal after rate amplification controls the turn-on and turn-off of described IGBT converter.
6. the device optimizing voltage source converter soft start-up process, it is characterised in that including:
Guan Bi module, for when the magnitude of voltage of DC bus capacitor rises to the first preset voltage value, controls with charging resistor also
The switch Guan Bi of connection；
Pre-modulated signal generation module, for when allow output pwm control signal time, generate variable weight electric voltage feed forward signal with
Sinusoidal modulation signal；Wherein, the electric voltage feed forward signal of described variable weight is unfiltered electric voltage feed forward signal and filtered electricity
The weighting of pressure feed-forward signal, described unfiltered electric voltage feed forward signal has the first weighted value being gradually reduced, after described filtering
Electric voltage feed forward signal there is the second weighted value being gradually increased；And described pre-modulated signal generation module includes that feed-forward signal is raw
Become unit and sinusoidal modulation signal signal generating unit；
Total modulated signal generation module, for the electric voltage feed forward signal of described variable weight is added in described sinusoidal modulation signal,
Generate total modulated signal；
Control signal generation module, for according to described total modulated signal, generates described pwm control signal；
Control module, for export described pwm control signal to IGBT converter with control described IGBT converter conducting with
Turn off, and then control the charging of described DC bus capacitor；
Soft-start module, for when the magnitude of voltage of described DC bus capacitor rises to the second preset voltage value, it is determined that soft start
Complete.
7. the device optimizing voltage source converter soft start-up process as claimed in claim 6, it is characterised in that described optimization
The device of voltage source converter soft start-up process also includes:
Pre-charge module, for when the magnitude of voltage of DC bus capacitor is less than the first preset voltage value, forbids that exporting PWM controls letter
Number with keep IGBT converter turn off, and control switch off in parallel with charging resistor so that the power supply signal of electrical grid transmission
By the anti-paralleled diode of IGBT converter, described DC bus capacitor is charged after flowing through described charging resistor；
Time delay module, is used for forbidding exporting described pwm control signal, and after the delay time that experience is preset, it is allowed to output institute
State pwm control signal.
The device optimizing voltage source converter soft start-up process the most as claimed in claims 6 or 7, it is characterised in that described
Feed-forward signal signal generating unit specifically for:
The initial value arranging described first weighted value is 1, and the initial value of described second weighted value is 0；And
Described second preset voltage value is increased to allowing the output described pwm control signal magnitude of voltage to described DC bus capacitor
During, it is gradually reduced described first weighted value and is gradually increased described second weighted value simultaneously, until described first weight
Value becomes 0, and described second weighted value becomes 1.
The device optimizing voltage source converter soft start-up process the most as claimed in claims 6 or 7, it is characterised in that described
Sinusoidal modulation signal signal generating unit also includes:
Coordinate transform subelement, gathers the output electric current of inverter, and described output electric current carries out coordinate transform, generates reality
Watt current and actual reactive current；
Make difference subelement, for by poor to default watt current and described actual watt current, generate the first difference signal, with
And by poor to default reactive current and described actual reactive current, generate the second difference signal；
PI regulon unit, for described first difference signal and described second difference signal are carried out PI regulation respectively, generates
First modulated signal and the second modulated signal；
Inverse transformation subelement, for described first modulated signal and described second modulated signal carry out inverse transformation, generates described
Sinusoidal modulation signal.
The device optimizing voltage source converter soft start-up process the most as claimed in claims 6 or 7, it is characterised in that described
Control signal generation module specifically for:
Described total modulated signal is compared with triangular wave, generates described pwm control signal；
Described control module specifically for:
Export described pwm control signal to drive amplification circuit so that described pwm control signal is carried out power amplification, by through merit
Pwm control signal after rate amplification controls the turn-on and turn-off of described IGBT converter.
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