CN106100310B - 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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- CN106100310B CN106100310B CN201610461019.5A CN201610461019A CN106100310B CN 106100310 B CN106100310 B CN 106100310B CN 201610461019 A CN201610461019 A CN 201610461019A CN 106100310 B CN106100310 B CN 106100310B
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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
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- H02M1/36—Means for starting or stopping converters
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Abstract
The invention discloses a kind of methods for optimizing voltage source converter soft start-up process, comprising: when the voltage value of DC bus capacitor rises to the first preset voltage value, controls in parallel with charging resistor close the switch；When allowing to export pwm control signal, the electric voltage feed forward signal and sinusoidal modulation signal of variable weight are generated；The sinusoidal modulation signal is added in the electric voltage feed forward signal of the variable weight, generates total modulated signal；According to total modulated signal, pwm control signal is generated；The turn-on and turn-off that the pwm control signal controls the IGBT converter to IGBT converter are exported, and then control the charging of the DC bus capacitor；When the voltage value of the DC bus capacitor rises to the second preset voltage value, determine that soft start is completed.The invention also discloses a kind of devices for optimizing voltage source converter soft start-up process.Using the present invention, it can realize the smooth transition of simultaneously network process in the case where power grid environment is severe, improve inverter to the adaptability of power grid.
Description
Technical field
The present invention relates to converter Control field more particularly to a kind of sides for optimizing voltage source converter soft start-up process
Method and device.
Background technique
Inverter is during startup, it may appear that large inrush current is so as to cause oscillation, and Converter DC-side capacitor
Voltage initial value differs larger with voltage given value, will lead to voltage overshoot in starting moment, and then DC voltage is caused to overshoot, makes
It is damaged at capacitor, or even generates explosion, so must be subject to using soft Starting Technology to the electric current in inverter start-up course
Limitation.Wherein, soft start-up process includes pre-charge process and PWM (pulse width modulation: pulse width modulation)
Copped wave charging process.
Since there are the electricity supply and use equipment of a large amount of non-linear impedance characteristics, these equipment are to utility network in electric system
Harmonic electric current generates harmonic voltage in utility network, compares relatively rugged environment when inverter is in grid voltage quality
When middle, there are a large amount of low-order harmonic and higher hamonic waves in power grid, this not only will affect the stabilization of Converter DC-side voltage,
It even also will cause direct current side overvoltage, seriously affect the stable operation of inverter.The prior art is used in PWM copped wave charging process
The middle technical solution that fixed voltage feed-forward control is added inhibits influence of the voltage ripple of power network to DC voltage, wherein
The fixed voltage feed-forward signal of addition is unfiltered electric voltage feed forward signal or the filtered electric voltage feed forward letter of low-pass filtered device
Number.
The present inventor is in implementing the present invention, it may, discovery prior art Shortcomings, on the one hand, according to unfiltered
Electric voltage feed forward signal, then can only eliminate the influence of the power grid containing low-order harmonic, the power grid containing higher hamonic wave cannot be eliminated
Influence may have a large amount of higher hamonic waves in power grid when power grid environment is severe, and terminate in PWM copped wave charging process
When into the DC voltage pressure stabilizing stage, the frequent fluctuation of network voltage can cause the fluctuation of DC voltage.On the other hand, if adopting
With filtered electric voltage feed forward signal, the influence of the power grid containing higher hamonic wave can be eliminated, but filtering will cause delay, this
A delay will be likely longer than the grid-connected disturbance time, prevent electric voltage feed forward signal is caused from offsetting grid disturbances amount in time
It impacts in short-term, when impacting excessive, possible direct trigger protection, leads to not successfully grid-connected.
Summary of the invention
Technical problem to be solved by the present invention lies in provide a kind of side for optimizing voltage source converter soft start-up process
Method and device can effectively solve due to containing a large amount of higher hamonic waves in power grid so as to cause DC voltage fluctuation, and because right
Delay caused by electric voltage feed forward signal is filtered leads to not successfully grid-connected problem.
In order to solve the above-mentioned technical problem, one aspect of the present invention provides that a kind of optimization voltage source converter is soft to be opened
The method of dynamic process, comprising the following steps:
When the voltage value of DC bus capacitor rises to the first preset voltage value, controls the switch in parallel with charging resistor and close
It closes；
When allowing to export pwm control signal, the electric voltage feed forward signal and sinusoidal modulation signal of variable weight are generated；Wherein,
The electric voltage feed forward signal of the variable weight is the weighting of unfiltered electric voltage feed forward signal and filtered electric voltage feed forward signal, institute
Stating unfiltered electric voltage feed forward signal has the first weighted value for being gradually reduced, the filtered electric voltage feed forward signal have by
Cumulative the second big weighted value；
The electric voltage feed forward signal of the variable weight is added in the sinusoidal modulation signal, total modulated signal is generated；
According to total modulated signal, the pwm control signal is generated；
Exporting the pwm control signal, (insulated gate bipolar transistor, insulated gate are double to IGBT
Bipolar transistor) current transformer to control the turn-on and turn-off of the IGBT converter controls filling for the DC bus capacitor
Electricity；
When the voltage value of the DC bus capacitor rises to the second preset voltage value, determine that soft start is completed.
Further, described when the voltage value of DC bus capacitor rises to the first preset voltage value, control and charging
Before the closing the switch of resistor coupled in parallel, further includes:
When the voltage value of DC bus capacitor is less than the first preset voltage value, forbid exporting pwm control signal to keep
IGBT converter shutdown, and control the switch in parallel with charging resistor and disconnect, so that the power supply signal of electrical grid transmission is flowing through
It is charged by the anti-paralleled diode of IGBT converter to the DC bus capacitor after stating charging resistor.
Preferably, described when the voltage value of DC bus capacitor rises to the first preset voltage value, control and charging resistor
It is in parallel close the switch after, further includes:
Forbid exporting the pwm control signal, and after undergoing preset delay time, allows to export the PWM control
Signal.
Specifically, the feed-forward signal generation unit is specifically used for:
The initial value that first weighted value is arranged is 1, and the initial value of second weighted value is 0；And
Increase to the described second default electricity in the voltage value for allowing to export the pwm control signal to the DC bus capacitor
It during pressure value, is gradually reduced first weighted value and gradually increases second weighted value simultaneously, until described first
Weighted value becomes 0, and second weighted value becomes 1.
Specifically, the generation sinusoidal modulation signal, specifically includes the following steps:
The output electric current for acquiring inverter, and the output electric current is coordinately transformed, generate practical watt current with
Practical reactive current；
It is poor that preset watt current and the practical watt current are made, and generates the first difference signal, and will be preset
It is poor that reactive current and the practical reactive current are made, and generates the second difference signal；
First difference signal and second difference signal are subjected to PI adjusting respectively, generate the first modulated signal and
Second modulated signal；
First modulated signal and second modulated signal are subjected to inverse transformation, generate the sinusoidal modulation signal.
Further, the total modulated signal of the basis generates the pwm control signal, specifically:
Total modulated signal is compared with triangular wave, generates the pwm control signal.
Further, the output pwm control signal controls leading for the IGBT converter to IGBT converter
Logical and shutdown, specifically:
The pwm control signal is exported to drive amplification circuit to carry out power amplification to the pwm control signal, by passing through
The amplified pwm control signal of overpower controls the turn-on and turn-off of the IGBT converter.
To solve the above-mentioned problems, another aspect of the present invention provides a kind of optimization voltage source converter soft start
The device of process, comprising:
It is closed module, for when the voltage value of DC bus capacitor rises to the first preset voltage value, control to be electric with charging
Resistance is in parallel to be closed the switch；
Pre-modulated signal generation module, for when allowing to export pwm control signal, generating the electric voltage feed forward letter of variable weight
Number and sinusoidal modulation signal；Wherein, after the electric voltage feed forward signal of the variable weight is unfiltered electric voltage feed forward signal and filters
Electric voltage feed forward signal weighting, the unfiltered electric voltage feed forward signal has the first weighted value for being gradually reduced, the filter
Electric voltage feed forward signal after wave has the second weighted value being gradually increased；And the pre-modulated signal generation module includes feedforward letter
Number generation unit and sinusoidal modulation signal generation unit；
Total modulated signal generation module, for the sinusoidal modulation signal to be added in the electric voltage feed forward signal of the variable weight
In, generate total modulated signal；
Signal generation module is controlled, for generating the pwm control signal according to total modulated signal；
Control module, for exporting the pwm control signal to IGBT converter to control leading for the IGBT converter
Logical and shutdown, and then control the charging of the DC bus capacitor；
Soft-start module, for determining soft when the voltage value of the DC bus capacitor rises to the second preset voltage value
Start completion.
Further, the device of the optimization voltage source converter soft start-up process further include:
Pre-charge module exports PWM control for forbidding when the voltage value of DC bus capacitor is less than the first preset voltage value
Signal processed controls the switch in parallel with charging resistor and disconnects to keep IGBT converter to turn off, so that the power supply of electrical grid transmission
Signal charges to the DC bus capacitor by the anti-paralleled diode of IGBT converter after flowing through the charging resistor.
Further, the device of the optimization voltage source converter soft start-up process further include:
Time delay module exports the pwm control signal for forbidding, and after undergoing preset delay time, allows defeated
The pwm control signal out.
Further, the feed-forward signal generation unit is specifically used for:
The initial value that first weighted value is arranged is 1, and the initial value of second weighted value is 0；And
Increase to the described second default electricity in the voltage value for allowing to export the pwm control signal to the DC bus capacitor
It during pressure value, is gradually reduced first weighted value and gradually increases second weighted value simultaneously, until described first
Weighted value becomes 0, and second weighted value becomes 1.
Specifically, the sinusoidal modulation signal generation unit includes:
Coordinate transform subelement acquires the output electric current of inverter, and the output electric current is coordinately transformed, and generates
Practical watt current and practical reactive current；
Make poor subelement, it is poor for making preset watt current and the practical watt current, generate the first difference letter
Number, and preset reactive current and the practical reactive current are made into poor, the second difference signal of generation；
PI (proportional integral, proportional integration) regulator unit, for will first difference signal with
Second difference signal carries out PI adjusting respectively, generates the first modulated signal and the second modulated signal；
Inverse transformation subelement is generated for first modulated signal and second modulated signal to be carried out inverse transformation
The sinusoidal modulation signal.
Further, the control signal generation module is specifically used for:
Total modulated signal is compared with triangular wave, generates the pwm control signal.
Further, the control module is specifically used for:
The pwm control signal is exported to drive amplification circuit to carry out power amplification to the pwm control signal, by passing through
The amplified pwm control signal of overpower controls the turn-on and turn-off of the IGBT converter.
The invention has the following beneficial effects:
The present invention can be effectively eliminated humorous containing high order by the electric voltage feed forward signal of the addition variable weight in sinusoidal modulation wave
Influencing and adapting to the power grid containing various harmonic waves for the power grid of wave, effectively increases the stability of DC voltage, makes grid-connected
Electric current is more preferable, and then realizes the smooth transition of simultaneously network process.Also, it can solve when having just enter into PWM copped wave charging process, by
The delay caused by being filtered to electric voltage feed forward signal causes electric voltage feed forward signal that cannot offset grid disturbances amount in time,
And then there is dash current in short-term, when dash current is excessive, possible direct trigger protection, leads to problem that cannot be grid-connected, effectively
Improve grid-connected success rate.
Detailed description of the invention
Fig. 1 is a kind of process signal for the method for optimizing voltage source converter soft start-up process in the embodiment of the present invention 1
Figure；
Fig. 2 be the optimization voltage source converter soft start-up process of the embodiment of the present invention 1 method in generate Sine Modulated
The flow diagram of signal；
Fig. 3 is a kind of process signal for the method for optimizing voltage source converter soft start-up process in the embodiment of the present invention 2
Figure；
Fig. 4 is a kind of structural representation for the device for optimizing voltage source converter soft start-up process in the embodiment of the present invention 3
Figure；
Fig. 5 is that pre-modulated signal is raw in the device of the optimization voltage source converter soft start-up process of the embodiment of the present invention 3
At the structural schematic diagram of module；
Fig. 6 is sinusoidal modulation signal in the device of the optimization voltage source converter soft start-up process of the embodiment of the present invention 3
The structural schematic diagram of generation unit；
Fig. 7 is a kind of structural representation for the device for optimizing voltage source converter soft start-up process in the embodiment of the present invention 4
Figure；
Fig. 8 is a kind of topological structure schematic diagram of the grid-connected inverter of three level.
Specific embodiment
Following will be combined with the drawings in the embodiments of the present invention, and technical solution in the embodiment of the present invention carries out clear, complete
Site preparation description, it is clear that described embodiments are only a part of the embodiments of the present invention, instead of all the embodiments.It is based on
Embodiment in the present invention, it is obtained by those of ordinary skill in the art without making creative efforts every other
Embodiment shall fall within the protection scope of the present invention.
In all embodiments of the invention, unfiltered electric voltage feed forward signal is multiplied by preset feedforward for network voltage
Number, filtered electric voltage feed forward signal refer to the electricity that unfiltered electric voltage feed forward signal obtains after low-pass filter filters
Press feed-forward signal.
It is a kind of process for the method for optimizing voltage source converter soft start-up process in the embodiment of the present invention 1 referring to Fig. 1
Schematic diagram.
The embodiment of the present invention provides a kind of method for optimizing voltage source converter soft start-up process, comprising the following steps:
Step S11, it when the voltage value of DC bus capacitor rises to the first preset voltage value, controls in parallel with charging resistor
Close the switch；
Wherein, the switch is relay or thyristor, for rising in the voltage value of the DC bus capacitor
When first preset voltage value, it is shorted out the charging resistor；Wherein, the charging resistor plays metering function.
It should be noted that in embodiments of the present invention, pre-charge process is the voltage value of the DC bus capacitor from zero
It rises to first preset voltage value, and is closed switch this process being in parallel with the charging resistor.PWM copped wave was charged
Journey be the voltage value for allowing to export the pwm control signal to the DC bus capacitor rise to second preset voltage value this
One process.
It should be noted that in embodiments of the present invention, control be in parallel with the charging resistor close the switch after, directly
Connecing allows to export the pwm control signal (opening pulsed drive), into the PWM copped wave charging process, and is controlled by PWM
Signal controls the turn-on and turn-off of IGBT converter, and then controls the charging of the DC bus capacitor.
It should be noted that when the voltage value of the DC bus capacitor is less than first preset voltage value, power grid benefit
It is charged through the charging resistor to the DC bus capacitor with the anti-paralleled diode of the IGBT converter.In the precharge
In the process, the voltage value of the DC bus capacitor will be raised to first preset voltage value from above freezing, generally, described to be pre-charged
Journey can only at most make the voltage value of the DC bus capacitor rise to the peak value of network voltage, such as in three-phase three-wire system 380V electricity
Off the net, the pre-charge process can make the voltage value of the DC bus capacitor rise to 540V or so, therefore described first is default
Voltage value is no more than 540V.Preferably, the value range of first preset voltage value is 500V~520V, of the invention real
It applies in example, sets first preset voltage value as 520V.
Step S12, when allowing to export pwm control signal, the electric voltage feed forward signal and Sine Modulated for generating variable weight are believed
Number；Wherein, the electric voltage feed forward signal of the variable weight is unfiltered electric voltage feed forward signal and filtered electric voltage feed forward signal
Weighting, the unfiltered electric voltage feed forward signal has the first weighted value for being gradually reduced, the filtered electric voltage feed forward
Signal has the second weighted value being gradually increased；
Specifically, the electric voltage feed forward signal for generating variable weight, specifically:
The initial value that first weighted value is arranged is 1, and the initial value of second weighted value is 0；And
Increase to the described second default electricity in the voltage value for allowing to export the pwm control signal to the DC bus capacitor
It during pressure value, is gradually reduced first weighted value and gradually increases second weighted value simultaneously, until described first
Weighted value becomes 0, and second weighted value becomes 1.
It should be noted that in entire PWM copped wave charging process, by the unfiltered electric voltage feed forward signal and described
Filtered electric voltage feed forward signal is added in the sinusoidal modulation signal simultaneously.Also, the unfiltered electric voltage feed forward letter
Number the first weighted value and the change frequency of the second weighted value of the filtered electric voltage feed forward signal be according to preset system
The total duration of system duration interrupt cycle and the PWM copped wave charging process determines, it is desirable that cuts in the PWM to must assure that
Wave charging process terminates, into before the DC voltage pressure stabilizing stage, the second weighted value of the filtered electric voltage feed forward signal
Become 1.Wherein, the total duration of the PWM copped wave charging process is by charging current value (the i.e. described preset watt current value)
It determines, therefore, in embodiments of the present invention, presetting the system break cycle duration is 50us, presets the watt current value
It for 0.4A, and sets and changes primary first weighted value and second weighted value every two interrupt cycle, wherein described
First weighted value and second weighted value change simultaneously.
Wherein, it is described generate sinusoidal modulation signal specific method as shown in Fig. 2, specifically includes the following steps:
Step S121, the output electric current of inverter is acquired, and the output electric current is coordinately transformed, generation actually has
Function electric current and practical reactive current；
Wherein, for three-phase three-wire system three-level converter, the coordinate is transformed to ABC-DQ coordinate transform；The ABC-
DQ coordinate transform is the direct current being transformed into the Three-phase alternating current signal under three-phase static coordinate system under two-phase rotating coordinate system
Signal, to realize decoupling.Since three-phase alternating current side is time-varying of ac, and there are very strong couplings between each phase, therefore, each phase
It can influence each other, be unfavorable for Control System Design.Therefore, constant is converted in stable state by time-varying of ac, by three-phase alternating current
At active and idle two-phase DC signal, (i.e. practical watt current and reality are idle by the ABC-DQ coordinate transform for signal
Electric current), can make in system it is active and idle can be controlled separately, improve the high efficiency and reliability of system control.
In addition, for three-phase four-wire system three-level converter, the coordinate is transformed to ABC-DQ0 coordinate transform, principle with it is described
The principle of ABC-DQ coordinate transform is roughly the same, and details are not described herein.
Step S122, it is poor to make preset watt current and the practical watt current, generates the first difference signal, and
It is poor that preset reactive current and the practical reactive current are made, and generates the second difference signal；
Optionally, the preset reactive current value is zero, and the preset watt current value is estimated according to system performance；
Wherein, the preset watt current determines the speed of charging, and the bigger charging of the preset watt current is faster, but charges
Speed cannot too fastly can not be too slow, mono- moderate value of Ying Xuanding, in embodiments of the present invention, by the preset active electricity
Stream is set as 0.4A.
Step S123, first difference signal and second difference signal are subjected to PI adjusting respectively, generate first
Modulated signal and the second modulated signal；
Wherein, the PI adjusting is to constitute control deviation according to given value (i.e. preset value) and real output value, by deviation
Ratio (P) and integral (I) by linear combination composition control amount, controlled device is controlled.
Step S124, first modulated signal and second modulated signal are subjected to inverse transformation, generate the sine
Modulated signal.
Wherein, for three-phase three-wire system three-level converter, the contravariant is changed to DQ-ABC coordinate transform；I.e. two-phase rotates
Active and idle modulated signal (i.e. institute needed for generation system after active and reactive component under coordinate system is adjusted by the PI
State the first modulated signal and the second modulated signal), described active and idle modulated signal is after the DQ-ABC coordinate transform
It can become the three-phase alternating current modulated signal (the i.e. described sinusoidal modulation signal) under three-phase static coordinate system.In addition, for three-phase four
Line three-level converter, the contravariant are changed to DQ0-ABC coordinate transform, principle and the DQ-ABC coordinate transform substantially phase
Together, details are not described herein.
It should be noted that sinusoidal modulation signal generating mode described in S121~S124 is only one in the present invention
A embodiment, i.e., when constant current charging method by the way of generation sinusoidal modulation signal；And in practical applications, PWM copped wave
Charging process can also be stepped up method and variable PI parameter method using voltage is given；
When being stepped up method using voltage is given, preset DC voltage value after precharge be incremented by, and it is every
Preset DC voltage value is all gradually increasing in a primitive period, and reaches final after the primitive period of experience predetermined number
Value.Wherein, the step of generating sinusoidal modulation signal is, by predetermined DC side voltage value and the actual DC side voltage value detected
It is poor to make, and the difference signal is input in Voltage loop, and Voltage loop calculate to the difference signal and output watt current,
The watt current participates in the calculating of electric current loop, and further, electric current loop exports the sinusoidal modulation signal.
When using variable PI parameter method, when the DC voltage value is less than preset value, the PI ginseng of Voltage loop adjuster
Number chooses lesser value, when DC voltage is lower, to slow down the rate of climb and error accumulation of DC voltage, reduces super
Tune amount；Then it is gradually increased PI parameter, is finally reached the PI parameter in DC voltage pressure stabilizing control stage, electric current loop during this
Output be the sinusoidal modulation signal, wherein the output of Voltage loop is watt current, and the watt current participates in electric current loop
It calculates.
Step S13, the electric voltage feed forward signal of the variable weight is added in the sinusoidal modulation signal, generates total modulation letter
Number；
Step S14, according to total modulated signal, the pwm control signal is generated；
Specifically, step S14 specifically:
Total modulated signal is compared with triangular wave, generates the pwm control signal.
It should be noted that generating this process of the pwm control signal according to total modulated signal, being exactly will be sinusoidal
Wave is converted to the process of square wave.
Wherein, the modulation of three level triangle waves is developed by the modulation of two level triangle waves, described and triangle
Wave, which is compared, to be referred to being divided into upper layer and lower layer using two equal in magnitude and identical triangular carriers of phase and being laminated,
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 from the comparison result of upper and lower carrier wave according to sinusoidal modulation wave.Also, for the three level changes of current
For device, according to two groups of triangular carrier phase relations, carrier wave can be divided into phase PWM modulation and carrier wave reverse phase PWM modulation, two kinds
Modulation algorithm is completely the same, and when the positive half-wave of sinusoidal modulation wave is greater than upper layer carrier, output level is+1；Work as sinusoidal modulation wave
Minus half wave amplitude be less than lower layer's carrier wave when, output level be -1；Remaining is 0.In addition, for two level converters, then
Only+1 and -1 two kind of output situation, principle is roughly the same with three level conditions, and details are not described herein.
Wherein, carrier wave is to be divided into upper layer and lower layer using two groups of amplitudes and the identical triangular carrier of phase with phase PWM modulation, point
It is not symmetrically distributed in the positive and negative half-wave of same modulating wave.Carrier wave reverse phase PWM modulation is that lower carrier wave becomes symmetrically to carry with upper carrier wave
Wave, equal in magnitude, opposite in phase.It is consistent with the stacking of same phase carrier wave to the positive half-wave of sinusoidal modulation wave；And for the negative of modulating wave
Half cycle, due to the difference of carrier wave, conducting changes with shutdown timing.
It should be noted that pwm control signal is generated using the method for triangle wave modulation in the embodiment of the present invention,
Only one of embodiment can also generate pwm control signal, such as modulation of stagnant ring and space using other modulator approaches
Vector Modulation etc..
Step S15, conducting and pass that the pwm control signal controls the IGBT converter to IGBT converter are exported
It is disconnected, and then control the charging of the DC bus capacitor；
Specifically, step S15 specifically:
The pwm control signal is exported to drive amplification circuit to carry out power amplification to the pwm control signal, by passing through
The amplified pwm control signal of overpower controls the turn-on and turn-off of the IGBT converter.
It should be noted that the DC bus capacitor, which needs to absorb active power, could increase voltage, in the PWM copped wave
It is to be charged by given lesser watt current, the turn-on and turn-off of the IGBT converter are formed in charging process
Current path makes the DC bus capacitor absorb active power always, when the voltage of the DC bus capacitor rises to described
When two preset voltage values, terminate soft start.After soft start, stage, the DC side electricity are controlled into DC voltage pressure stabilizing
Hold and carry out active energy exchange with power grid, (the i.e. described DC voltage is lower than described second to keep the stabilization of DC voltage
When preset voltage value, the active power of power grid is absorbed；Higher than second preset voltage value, active power is discharged to power grid).
In addition, the output pwm control signal exports 12 road PWM for three-phase three-wire system three-level converter
Signal is controlled, to control the turn-on and turn-off of the IGBT converter, and then controls the charging of DC bus capacitor.
Optionally, drive amplification circuit can be dedicated drive module 2SC0435T.
Step S16, when the voltage value of the DC bus capacitor rises to the second preset voltage value, determine that soft start is complete
At.
In soft start-up process, the initial voltage value of the DC bus capacitor is zero, the voltage value of the DC bus capacitor
The second preset voltage value is gradually risen to from zero.Wherein, second preset voltage value is sentenced according to the size of network voltage
The stationary value of disconnected DC voltage, such as under 380V power grid, DC voltage will be controlled in 720V or more.Therefore, at this
In inventive embodiments, second preset value can be set as 800V.
Fig. 3 is a kind of process signal for the method for optimizing voltage source converter soft start-up process in the embodiment of the present invention 2
Figure, the embodiment of the present invention includes following steps:
Step S21, when the voltage value of DC bus capacitor is less than the first preset voltage value, forbid exporting pwm control signal
It to keep IGBT converter to turn off, and controls the switch in parallel with charging resistor and disconnects, so that the power supply signal of electrical grid transmission exists
It is charged by the anti-paralleled diode of IGBT converter to the DC bus capacitor after flowing through the charging resistor.
It should be noted that the IGBT converter may include multiple igbt transistors, for example, in three-level converter
In, one shares three groups of igbt transistors, wherein every group has 4.Herein, described to forbid exporting pwm control signal to keep described
IGBT converter shutdown, refers to that each igbt transistor is all in off state in the IGBT converter.
It should be noted that when the voltage value of the DC bus capacitor is less than first preset voltage value, power grid benefit
It is charged through the charging resistor to the DC bus capacitor with the anti-paralleled diode of the IGBT converter.In the precharge
In the process, the voltage value of the DC bus capacitor will be raised to first preset voltage value from above freezing, generally, described to be pre-charged
Journey can only at most make the voltage value of the DC bus capacitor rise to the peak value of network voltage, such as in three-phase three-wire system 380V electricity
Off the net, the pre-charge process can make the voltage value of the DC bus capacitor rise to 540V or so, therefore described first is default
Voltage value is no more than 540V.Preferably, the value range of first preset voltage value is 500V~520V, of the invention real
It applies in example, sets first preset voltage value as 520V.
Step S22, when the voltage value of the DC bus capacitor rises to first preset voltage value, control with it is described
Charging resistor is in parallel to be closed the switch；
Step S23, forbid exporting the pwm control signal, and after undergoing preset delay time, allow described in output
Pwm control signal.
Optionally, in embodiments of the present invention, the preset delay time is set as 0.7s.
It should be noted that in embodiments of the present invention, the pre-charge process is the voltage value of the DC bus capacitor
It is raised to first preset voltage value from above freezing, is closed the switch being in parallel with the charging resistor, and undergone described preset
This process of delay time.The PWM copped wave charging process is to allow to export the pwm control signal to the DC bus capacitor
Voltage value rise to described this process of second preset voltage value.
It should be noted that in embodiments of the present invention, control be in parallel with the charging resistor close the switch after, in institute
The power supply signal for stating electrical grid transmission in preset delay time directly passes through the anti-paralleled diode of IGBT converter to DC side
Capacitor charging is done with improving charging rate and increasing the DC voltage further for the PWM copped wave charging process
Prepare.
Step S24, when allowing to export the pwm control signal, the electric voltage feed forward signal and sinusoidal tune of variable weight are generated
Signal processed；Wherein, the electric voltage feed forward signal of the variable weight is unfiltered electric voltage feed forward signal and filtered electric voltage feed forward
The weighting of signal, the unfiltered electric voltage feed forward signal have the first weighted value being gradually reduced, the filtered voltage
Feed-forward signal has the second weighted value being gradually increased.
Specifically, the electric voltage feed forward signal of the variable weight is generated specifically:
The initial value that first weighted value is arranged is 1, and the initial value of second weighted value is 0；And
Increase to the described second default electricity in the voltage value for allowing to export the pwm control signal to the DC bus capacitor
It during pressure value, is gradually reduced first weighted value and gradually increases second weighted value simultaneously, until described first
Weighted value becomes 0, and second weighted value becomes 1.
Wherein, it is described generate sinusoidal modulation signal specific method as shown in Fig. 2, specifically includes the following steps:
Step S241, the output electric current of inverter is acquired, and the output electric current is coordinately transformed, generation actually has
Function electric current and practical reactive current；
Step S242, it is poor to make preset watt current and the practical watt current, generates the first difference signal, and
It is poor that preset reactive current and the practical reactive current are made, and generates the second difference signal；
Step S243, first difference signal and second difference signal are subjected to PI adjusting respectively, generate first
Modulated signal and the second modulated signal；
Step S244, first modulated signal and second modulated signal are subjected to inverse transformation, generate the sine
Modulated signal.
Step S25, the electric voltage feed forward signal of the variable weight is added in the sinusoidal modulation signal, generates total modulation letter
Number；
Step S26, according to total modulated signal, the pwm control signal is generated；
Specifically, step S26 specifically:
Total modulated signal is compared with triangular wave, generates the pwm control signal.
Step S27, conducting and pass that the pwm control signal controls the IGBT converter to IGBT converter are exported
It is disconnected, so that the power supply signal of the electrical grid transmission directly charges to the DC bus capacitor by the IGBT converter；
Specifically, step S27 specifically:
The turn-on and turn-off that the pwm control signal controls the IGBT converter to IGBT converter are exported, in turn
Control the charging of the DC bus capacitor；
Step S28, when the voltage value of the DC bus capacitor rises to the second preset voltage value, determine that soft start is complete
At.
It should be noted that at the end of the pre-charge process, if the switch being in parallel with the charging resistor closed
It is directly opened after conjunction pulsed drive (allowing to export the pwm control signal), it is described issuable very big when closing the switch
Dash current, this will affect the starting of the PWM copped wave charging process of next stage.In embodiments of the present invention, closure and institute
The switch of charging resistor parallel connection is stated, and after undergoing the preset delay time, then open pulsed drive, so that the switch
The dash current generated when closure can be buffered, so that the PWM copped wave charging process can smoothly start, can effectively be mentioned
High grid-connected success rate.
The embodiment of the present invention also provides a kind of device for optimizing voltage source converter soft start-up process, as shown in figure 4, being
A kind of structural schematic diagram for the device optimizing voltage source converter soft start-up process in the embodiment of the present invention 3, comprising:
It is closed module 11, for when the voltage value of DC bus capacitor rises to the first preset voltage value, controlling and charging
Resistor coupled in parallel closes the switch；
Pre-modulated signal generation module 12, for generating the electric voltage feed forward of variable weight when allowing to export pwm control signal
Signal and sinusoidal modulation signal；Wherein, the electric voltage feed forward signal of the variable weight is unfiltered electric voltage feed forward signal and filtering
The weighting of electric voltage feed forward signal afterwards, the 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 the pre-modulated signal generation module includes feedforward
Signal generation unit 121 and sinusoidal modulation signal generation unit 122, as shown in Figure 5；
Total modulated signal generation module 13, believes for the Sine Modulated to be added in the electric voltage feed forward signal of the variable weight
In number, total modulated signal is generated；
Signal generation module 14 is controlled, for generating the pwm control signal according to total modulated signal；
Control module 15, for exporting the pwm control signal to IGBT converter to control the IGBT converter
Turn-on and turn-off, and then control the charging of the DC bus capacitor；
Soft-start module 16, for determining when the voltage value of the DC bus capacitor rises to the second preset voltage value
Soft start is completed.
Wherein, the feed-forward signal generation unit 121 is specifically used for:
The initial value that first weighted value is arranged is 1, and the initial value of second weighted value is 0；And
Increase to the voltage value of DC bus capacitor the process of the second preset voltage value allowing to export pwm control signal
In, it is gradually reduced first weighted value and gradually increases second weighted value simultaneously, until first weighted value becomes
0, second weighted value becomes 1.
Wherein, the sinusoidal modulation signal generation unit 122 is specifically included referring to Fig. 6:
Coordinate transform subelement 1221 acquires the output electric current of inverter, and the output electric current is coordinately transformed,
Generate practical watt current and practical reactive current；
Make poor subelement 1222, it is poor for making preset watt current and the practical watt current, it is poor to generate first
Value signal, and preset reactive current and the practical reactive current are made into poor, the second difference signal of generation；
PI regulator unit 1223, for first difference signal and second difference signal to be carried out PI tune respectively
Section generates the first modulated signal and the second modulated signal；
Inverse transformation subelement 1224, for first modulated signal and second modulated signal to be carried out inverse transformation,
Generate the sinusoidal modulation signal.
Wherein, the control signal generation module 14 is specifically used for for total modulated signal being compared with triangular wave,
Generate pwm control signal.
Wherein, the control module 15 is specifically used for exporting the pwm control signal to drive amplification circuit to described
Pwm control signal carries out power amplification, and the conducting of the IGBT converter is controlled by the pwm control signal after power amplification
And shutdown.
It is a kind of structure for the device for optimizing voltage source converter soft start-up process in the embodiment of the present invention 4 referring to Fig. 7
Schematic diagram, comprising:
Pre-charge module 21 exports PWM for forbidding when the voltage value of DC bus capacitor is less than the first preset voltage value
Signal is controlled to keep IGBT converter to turn off, and controls the switch in parallel with charging resistor and disconnects, so that the electricity of electrical grid transmission
Source signal charges to DC bus capacitor by the anti-paralleled diode of IGBT converter after flowing through charging resistor.
It is closed module 22, for when the voltage value of DC bus capacitor rises to the first preset voltage value, controlling and charging
Resistor coupled in parallel closes the switch；
Time delay module 23 exports the pwm control signal for forbidding, and after undergoing preset delay time, allows
Export the pwm control signal.
Pre-modulated signal generation module 24, for generating the electric voltage feed forward of variable weight when allowing to export pwm control signal
Signal and sinusoidal modulation signal；Wherein, the electric voltage feed forward signal of the variable weight is unfiltered electric voltage feed forward signal and filtering
The weighting of electric voltage feed forward signal afterwards, the 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 the pre-modulated signal generation module includes feedforward
Signal generation unit and sinusoidal modulation signal generation unit；
Total modulated signal generation module 25, believes for the Sine Modulated to be added in the electric voltage feed forward signal of the variable weight
In number, total modulated signal is generated；
Signal generation module 26 is controlled, for generating the pwm control signal according to total modulated signal；
Control module 27, for exporting the pwm control signal to IGBT converter to control the IGBT converter
Turn-on and turn-off, and then control the charging of the DC bus capacitor；
Soft-start module 28, for determining when the voltage value of the DC bus capacitor rises to the second preset voltage value
Soft start is completed.
Wherein, the feed-forward signal generation unit is specifically used for:
The initial value that first weighted value is arranged is 1, and the initial value of second weighted value is 0；And
Increase to the voltage value of DC bus capacitor the process of the second preset voltage value allowing to export pwm control signal
In, it is gradually reduced first weighted value and gradually increases second weighted value simultaneously, until first weighted value becomes
0, second weighted value becomes 1.
Wherein, the sinusoidal modulation signal generation unit, specifically includes:
Coordinate transform subelement acquires the output electric current of inverter, and the output electric current is coordinately transformed, and generates
Practical watt current and practical reactive current；
Make poor subelement, it is poor for making preset watt current and the practical watt current, generate the first difference letter
Number, and preset reactive current and the practical reactive current are made into poor, the second difference signal of generation；
PI regulator unit, for first difference signal and second difference signal to be carried out PI adjusting respectively,
Generate the first modulated signal and the second modulated signal；
Inverse transformation subelement is generated for first modulated signal and second modulated signal to be carried out inverse transformation
The sinusoidal modulation signal.
Wherein, the control signal generation module 26 is specifically used for for total modulated signal being compared with triangular wave,
Generate pwm control signal.
Wherein, the control module 27 is specifically used for exporting the pwm control signal to drive amplification circuit to described
Pwm control signal carries out power amplification, and the conducting of the IGBT converter is controlled by the pwm control signal after power amplification
And shutdown.
It should be noted that at the end of the pre-charge process, if the switch being in parallel with the charging resistor closed
It is directly opened after conjunction pulsed drive (allow export pwm control signal), it is described issuable very big when closing the switch to rush
Electric current is hit, this will affect the starting of the PWM copped wave charging process of next stage.In embodiments of the present invention, increase time delay module,
For being closed the switch being in parallel with the charging resistor, and after undergoing preset delay time, then pulsed drive is opened, so that
The dash current generated when closing the switch can be buffered, so that the PWM copped wave charging process can smoothly start,
Grid-connected success rate can be effectively improved.
Referring to Fig. 8, in the case of three-phase three-wire system, for the topological structure of the grid-connected inverter of three level, to of the invention real
Example is applied to be further detailed.
It should be noted that the typical circuit topology of the three-level converter includes electric network source, charging resistor, relay
Device, LCL filter, IGBT converter, DC bus capacitor, driving circuit, signal conditioning circuit and controller.
In pre-charge process, relay is remained open, block driving, the charged resistance limit of the power supply signal of electrical grid transmission
It after stream, is charged by the anti-paralleled diode of IGBT converter to DC bus capacitor, controller determines DC bus capacitor
When voltage value is greater than or equal to the first preset value, control relay closure, and carry out preset delay.
In PWM copped wave charging process, driving is opened in controller control, and gives lesser watt current and zero idle electricity
Stream, the output electric current of signal conditioning circuit acquisition inverter are simultaneously input in controller, and controller carries out the output electric current
Processing is so that it generates practical watt current and practical reactive current, and the active electricity that will be given after ABC-DQ coordinate transform
After stream and practical watt current make difference and zero given reactive current and practical reactive current work difference, the first difference signal is generated
With the second difference signal, first difference signal and second difference signal are subjected to PI adjusting, generate active modulation letter
Number and idle modulated signal (i.e. the first modulated signal and the second modulated signal), will the active modulated signal and idle modulation letter
Three-phase modulations signal (i.e. sinusoidal modulation signal) is generated after number carrying out inverse transformation, the electric voltage feed forward signal of the variable weight is added
In three-phase modulations signal, total modulating wave (i.e. total modulated signal) is formed, it is raw after total modulating wave is compared with triangular wave
At 12 road pwm control signals, after 12 road pwm control signals are input to the progress power amplification of drive amplification circuit, then by passing through
12 road pwm control signal of power amplification Hou controls the turn-on and turn-off of 3 groups of IGBT converters (every group 4, totally 12) respectively,
To realize that the power supply signal of electrical grid transmission charges to DC bus capacitor, preset so that the voltage of DC bus capacitor rises to second
Value.
It should be noted that signal conditioning circuit needs acquisition network voltage, the change of current in real time in entire soft start-up process
The signals such as output electric current, the voltage of DC bus capacitor and the relay status of device are simultaneously entered into controller.
In addition, starting in PWM copped wave charging process (when allowing to export pwm control signal) on DC capacitor voltage
The second preset value is raised to during this, while unfiltered electric voltage feed forward signal and filtered electric voltage feed forward signal is added,
Wherein, the initial value that first weighted value is arranged is 1, and the initial value of second weighted value is 0；And in the process by
Decrescence small first weighted value simultaneously gradually increases second weighted value, until first weighted value becomes 0, described second
Weighted value becomes 1.
The present invention can be effectively eliminated humorous containing high order by the electric voltage feed forward signal of the addition variable weight in sinusoidal modulation wave
Influencing and adapting to the power grid containing various harmonic waves for the power grid of wave, effectively increases the stability of DC voltage, makes grid-connected
Electric current is more preferable, and then realizes the smooth transition of simultaneously network process.Also, it can solve when having just enter into PWM copped wave charging process, by
The delay caused by being filtered to electric voltage feed forward signal causes electric voltage feed forward signal that cannot offset grid disturbances amount in time,
And then there is dash current in short-term, when dash current is excessive, possible direct trigger protection, leads to problem that cannot be grid-connected, effectively
Improve grid-connected success rate.
The above is a preferred embodiment of the present invention, it is noted that for those skilled in the art
For, without departing from the principle of the present invention, several improvement and deformations can also be made, these improvement and deformations are also considered as
Protection scope of the present invention.
Claims (8)
1. a kind of method for optimizing voltage source converter soft start-up process, which comprises the following steps:
When the voltage value of DC bus capacitor rises to the first preset voltage value, in parallel with charging resistor close the switch is controlled；
When allowing to export pwm control signal, the electric voltage feed forward signal and sinusoidal modulation signal of variable weight are generated；Wherein, described
The electric voltage feed forward signal of variable weight be unfiltered electric voltage feed forward signal and filtered electric voltage feed forward signal weighting, it is described not
The electric voltage feed forward signal of filtering has the first weighted value being gradually reduced, and the filtered electric voltage feed forward signal, which has, gradually to be increased
The second big weighted value；
The electric voltage feed forward signal of the variable weight is added in the sinusoidal modulation signal, total modulated signal is generated；
According to total modulated signal, the pwm control signal is generated；
The turn-on and turn-off that the pwm control signal controls the IGBT converter to IGBT converter are exported, and then are controlled
The charging of the DC bus capacitor；
When the voltage value of the DC bus capacitor rises to the second preset voltage value, determine that soft start is completed；
Wherein, the electric voltage feed forward signal for generating variable weight, specifically:
The initial value that first weighted value is arranged is 1, and the initial value of second weighted value is 0；And
Increase to second preset voltage value in the voltage value for allowing to export the pwm control signal to the DC bus capacitor
During, it is gradually reduced first weighted value and gradually increases second weighted value simultaneously, until first weight
Value becomes 0, and second weighted value becomes 1.
2. the method for optimization voltage source converter soft start-up process as described in claim 1, which is characterized in that work as described
When the voltage value of DC bus capacitor rises to the first preset voltage value, before controlling in parallel with charging resistor close the switch, and also
Include:
When the voltage value of DC bus capacitor is less than the first preset voltage value, forbid exporting pwm control signal to keep IGBT to become
Device shutdown is flowed, and controls the switch in parallel with charging resistor and disconnects, so that the power supply signal of electrical grid transmission is flowing through the charging
It is charged by the anti-paralleled diode of IGBT converter to the DC bus capacitor after resistance；
Described when the voltage value of DC bus capacitor rises to the first preset voltage value, the control switch in parallel with charging resistor is closed
After conjunction, further includes:
Forbid exporting the pwm control signal, and after undergoing preset delay time, allows to export the pwm control signal.
3. the method for optimization voltage source converter soft start-up process as claimed in claim 1 or 2, which is characterized in that described
Sinusoidal modulation signal is generated, specifically includes the following steps:
The output electric current of inverter is acquired, and the output electric current is coordinately transformed, generates practical watt current and reality
Reactive current；
It is poor that preset watt current and the practical watt current are made, and generates the first difference signal, and will be preset idle
It is poor that electric current and the practical reactive current are made, and generates the second difference signal；
First difference signal and second difference signal are subjected to PI adjusting respectively, generate the first modulated signal and second
Modulated signal；
First modulated signal and second modulated signal are subjected to inverse transformation, generate the sinusoidal modulation signal.
4. the method for optimization voltage source converter soft start-up process as claimed in claim 1 or 2, which is characterized in that described
According to total modulated signal, the pwm control signal is generated, specifically:
Total modulated signal is compared with triangular wave, generates the pwm control signal；
The output pwm control signal controls the turn-on and turn-off of the IGBT converter to IGBT converter, specifically
Are as follows:
The pwm control signal is exported to drive amplification circuit to carry out power amplification to the pwm control signal, by passing through function
The amplified pwm control signal of rate controls the turn-on and turn-off of the IGBT converter.
5. a kind of device for optimizing voltage source converter soft start-up process characterized by comprising
It is closed module, for when the voltage value of DC bus capacitor rises to the first preset voltage value, control and charging resistor to be simultaneously
Connection closes the switch；
Pre-modulated signal generation module, for when allowing to export pwm control signal, generate the electric voltage feed forward signal of variable weight with
Sinusoidal modulation signal；Wherein, the electric voltage feed forward signal of the variable weight is unfiltered electric voltage feed forward signal and filtered electricity
The weighting of feed-forward signal is pressed, the unfiltered electric voltage feed forward signal has the first weighted value being gradually reduced, after the filtering
Electric voltage feed forward signal there is the second weighted value for being gradually increased；And the pre-modulated signal generation module includes that feed-forward signal is raw
At unit and sinusoidal modulation signal generation unit；
Total modulated signal generation module, for the electric voltage feed forward signal of the variable weight to be added in the sinusoidal modulation signal,
Generate total modulated signal；
Signal generation module is controlled, for generating the pwm control signal according to total modulated signal；
Control module, for exporting the pwm control signal to IGBT converter with control the IGBT converter conducting and
Shutdown, and then control the charging of the DC bus capacitor；
Soft-start module, for determining soft start when the voltage value of the DC bus capacitor rises to the second preset voltage value
It completes；
Wherein, the feed-forward signal generation unit is specifically used for:
The initial value that first weighted value is arranged is 1, and the initial value of second weighted value is 0；And
Increase to second preset voltage value in the voltage value for allowing to export the pwm control signal to the DC bus capacitor
During, it is gradually reduced first weighted value and gradually increases second weighted value simultaneously, until first weight
Value becomes 0, and second weighted value becomes 1.
6. the device of optimization voltage source converter soft start-up process as claimed in claim 5, which is characterized in that the optimization
The device of voltage source converter soft start-up process further include:
Pre-charge module exports PWM control letter for forbidding when the voltage value of DC bus capacitor is less than the first preset voltage value
Number to keep IGBT converter to turn off, and the switch disconnection in parallel with charging resistor is controlled, so that the power supply signal of electrical grid transmission
It is charged by the anti-paralleled diode of IGBT converter to the DC bus capacitor after flowing through the charging resistor；
Time delay module exports the pwm control signal for forbidding, and after undergoing preset delay time, allows to export institute
State pwm control signal.
7. such as the device of optimization voltage source converter soft start-up process described in claim 5 or 6, which is characterized in that described
Sinusoidal modulation signal generation unit further include:
Coordinate transform subelement acquires the output electric current of inverter, and the output electric current is coordinately transformed, and generates practical
Watt current and practical reactive current；
Make poor subelement, it is poor for making preset watt current and the practical watt current, the first difference signal is generated, with
And preset reactive current and the practical reactive current are made into poor, the second difference signal of generation；
PI regulator unit is generated for first difference signal and second difference signal to be carried out PI adjusting respectively
First modulated signal and the second modulated signal；
Inverse transformation subelement, for will first modulated signal and second modulated signal progress inverse transformation, described in generation
Sinusoidal modulation signal.
8. such as the device of optimization voltage source converter soft start-up process described in claim 5 or 6, which is characterized in that described
Control signal generation module is specifically used for:
Total modulated signal is compared with triangular wave, generates the pwm control signal；
The control module is specifically used for:
The pwm control signal is exported to drive amplification circuit to carry out power amplification to the pwm control signal, by passing through function
The amplified pwm control signal of rate controls the turn-on and turn-off of the IGBT converter.
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| US6239997B1 (en) * | 2000-09-01 | 2001-05-29 | Ford Motor Company | System for connecting and synchronizing a supplemental power source to a power grid |
| CN103312139A (en) * | 2012-03-09 | 2013-09-18 | 台达电子工业股份有限公司 | Starting device of grid-connected inverter and control method thereof |
| CN103887818A (en) * | 2014-03-17 | 2014-06-25 | 电子科技大学 | Low-voltage ride-through control method for grid-connected inverter |
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| US6239997B1 (en) * | 2000-09-01 | 2001-05-29 | Ford Motor Company | System for connecting and synchronizing a supplemental power source to a power grid |
| CN103312139A (en) * | 2012-03-09 | 2013-09-18 | 台达电子工业股份有限公司 | Starting device of grid-connected inverter and control method thereof |
| CN103887818A (en) * | 2014-03-17 | 2014-06-25 | 电子科技大学 | Low-voltage ride-through control method for grid-connected inverter |
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