CN110365025A - A kind of series capacitance coupled mode dynamic electric voltage recovery device and its control method - Google Patents
A kind of series capacitance coupled mode dynamic electric voltage recovery device and its control method Download PDFInfo
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- CN110365025A CN110365025A CN201910716064.4A CN201910716064A CN110365025A CN 110365025 A CN110365025 A CN 110365025A CN 201910716064 A CN201910716064 A CN 201910716064A CN 110365025 A CN110365025 A CN 110365025A
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J3/00—Circuit arrangements for ac mains or ac distribution networks
- H02J3/18—Arrangements for adjusting, eliminating or compensating reactive power in networks
- H02J3/1807—Arrangements for adjusting, eliminating or compensating reactive power in networks using series compensators
- H02J3/1814—Arrangements for adjusting, eliminating or compensating reactive power in networks using series compensators wherein al least one reactive element is actively controlled by a bridge converter, e.g. unified power flow controllers [UPFC]
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E40/00—Technologies for an efficient electrical power generation, transmission or distribution
- Y02E40/30—Reactive power compensation
Abstract
The present invention provides a kind of series capacitance coupled mode dynamic electric voltage recovery device and its control method, PWM inverter which is made of full-controlled device, DC side storage capacitor Cdc, LC output filter, series transformer T and serial coupling capacitor C constitute；Serial coupling capacitor C is installed in series in filter capacitor CfBetween series transformer T；When the present invention uses minimal energy compensation strategy, do not change and is not only able to achieve minimum active output on the basis of filter effect, inverter output voltage can be also significantly reduced, so that inverter capacity and DC voltage grade be effectively reduced, reduces equipment cost and system loss；During compensation, to guarantee the device energy safe and stable operation when load fluctuates, provides and be suitable for the invention angle regulation method, needed when necessary to load voltage UlCarry out the adjusting that angle is δ.
Description
Technical field
The invention belongs to power electronics control technology field, be related to a kind of series capacitance coupled mode dynamic electric voltage recovery device and
Its control method.
Background technique
As the fast-developing and a large amount of precision instrument and sensitive equipment of micro-capacitance sensor are widely used, more and more
Power quality problem gradually highlights, and Voltage Drop problem therein is the main of influence electric load stable operation
One of problem.Dynamic electric voltage recovery device (dynamic voltage restorer, DVR) high, reliability by its operational efficiency
The advantages such as height and rapidity are good become and solve the problems, such as Voltage Drop dynamic compensation the most economical and effective in electric system at present
Device.When compensating grid voltage sags, the size of dynamic electric voltage recovery device output voltage and the whole volume of PWM inverter have
It closes, that is, the offset voltage for needing to export is bigger, and the capacity of PWM inverter increases equipment also with regard to needing to increase with it
Operating cost and power loss.The voltage compensation strategy of dynamic electric voltage recovery device mainly has in-phase voltage compensation, complete voltage to mend
It repays and three kinds of minimal energy compensation, in order to realize the minimum of dynamic electric voltage recovery device active injection, substantially effectively utilizes
DC side energy storage device, extends the compensation time, and minimal energy compensation method obtains extensive concern.Although dynamic electric voltage recovery device is adopted
With active demand can be reduced when minimal energy compensation strategy to a certain extent, extend the compensation time, increases compensation ability, but can not
What is avoided the problem that brings dynamic electric voltage recovery device output voltage amplitude to increase.How the same of the active demand of compensation process is being reduced
When, output voltage grade is reduced, so that device whole volume be effectively reduced, be worth further investigation and inquire into.
Summary of the invention
In order to achieve the above object, the present invention provides a kind of series capacitance coupled mode dynamic electric voltage recovery device, solves existing
Dynamic electric voltage recovery device output voltage is brought when having dynamic electric voltage recovery device present in technology using minimal energy compensation strategy
The problem of amplitude increases.
It is a further object of the present invention to provide a kind of control methods of above-mentioned dynamic electric voltage recovery device.
In order to solve the above technical problems, the technical scheme adopted by the invention is that, a kind of series capacitance coupled mode dynamic electric
Voltage recovery device, which is characterized in that the PWM inverter that is made of full-controlled device, DC side storage capacitor Cdc, LC output filter,
Series transformer T and serial coupling capacitor C is constituted.
Further, the LC output filter is by filter inductance LfWith filter capacitor CfIt constitutes.
Further, the PWM inverter is made of 4 wholly-controled device IGBT and 4 freewheeling diodes.
Further, the DC side storage capacitor CdcIt is mounted on PWM inverter DC side, LC output filter is mounted on
PWM inverter exchanges side；DC side storage capacitor CdcAnode is connected with the collector of the 1st IGBT, DC side storage capacitor Cdc
The emitter of cathode and the 3rd IGBT are connected, and LC output filter one end is connected with the emitter of the 1st IGBT, LC output filter
The wave device other end is connected with the collector of the 4th IGBT.
Further, the serial coupling capacitor C is installed in series in filter capacitor CfBetween series transformer T.
Further, the series capacitance coupled mode dynamic electric voltage recovery device is connected by the series transformer T with power grid,
And it is in parallel using a by-pass switch K and series transformer T primary side.
Another technical solution of the invention is a kind of control method of series capacitance coupled mode dynamic electric voltage recovery device: inspection
Survey network voltage UsIf dsag>=0.9, dsagFor the grid voltage sags factor, then do not need to carry out voltage compensation, by-pass switch K
Closure, series capacitance coupled mode dynamic electric voltage recovery device work in stand-by state；If dsag< 0.9, i.e. network voltage fall
It falls, needs to carry out voltage compensation, by-pass switch K is disconnected, and series capacitance coupled mode dynamic electric voltage recovery device works normally, to power grid
Corresponding offset voltage is injected, to maintain the stabilization of load side voltage magnitude.
Further, the offset voltage determines by the following method:
Step S1, after detecting that network voltage falls, the instruction of series capacitance coupled mode dynamic electric voltage recovery device
Voltage, which calculates link, can calculate the finger of the offset voltage of injection power grid needed for series capacitance coupled mode dynamic electric voltage recovery device
Enable value U* dvr；
Step S2 carries out voltage and current double closed-loop to the offset voltage of series capacitance coupled mode dynamic electric voltage recovery device output
Control: compensated voltage instruction value U will be referred to* dvrWith series capacitance coupled mode dynamic electric voltage recovery device injecting compensating voltage UdvrMake
Difference, then by this difference be sent into outer voltage PI controller, by with outer ring proportional integration parameter KP1And KI1Operation is adjusted
Save signal Ir, the adjustment signal I that then obtains outer voltage PI controllerrReference instruction as current inner loop PI controller
Signal and filter inductance LfFilter inductance electric current ILfIt is poor to make, then obtained difference input current inner ring PI controller, passes through
With the proportional integration parameter K of inner ringP2And KI2Operation obtains corresponding adjustment signal；
Obtained adjustment signal is sent into driving circuit and generates corresponding driving signal control PWM inverter by step S3, from
And the offset voltage needed for series capacitance coupled mode dynamic electric voltage recovery device is generated.
Further, during series capacitance coupled mode dynamic electric voltage recovery device exports offset voltage, to guarantee in load
PWM inverter output voltage is without departing from its output limit voltage value U when fluctuatinginv-max, need to detect PWM inverter output
Voltage UinvSize, if Uinv≤Uinv-max, then it represents that PWM inverter output voltage is without departing from its output limit voltage value, string
Connection capacitively coupled dynamic electric voltage recovery device can safe and stable operation without carrying out angular adjustment obtain the instruction of offset voltage
Value U* dvr=Udvr；If Uinv> Uinv-max, then it represents that PWM inverter output voltage has exceeded its output limit voltage value, to guarantee
The safe and stable operation of device is needed to load voltage UlCarrying out adjusting that angle is δ can be with by adjusting the size of angle δ
Change the size and phase of offset voltage, and is adjusted the instruction value U that offset voltage is calculated* dvr=Udvr′, Udvr′To adjust
Series capacitance coupled mode dynamic electric voltage recovery device injecting compensating voltage swing after whole, to finally make PWM inverter output electricity
Pressure meets its limiting voltage requirement.
Further, the size by adjusting angle δ, thus it is possible to vary the method for offset voltage size and phase are as follows:
Here, PWM inverter output voltage UinvMeet condition
Uinv≤M·Udc (1)
Then the exportable extreme voltage values of available PWM inverter are Uinv-max=MUdc；
According toWithBetween relationship, δ can derive by following formula
ULCC=(1/ ω C- ω Lf)·Il (2)
After adjusting angle δ has been determined, the size of dynamic electric voltage recovery device injecting compensating voltage after available adjustment
For
It is possible to further obtainWithAngle γ be
Thus, offset voltage phase adjusted is
Wherein, the C in formula (3) is capacitance, and M is modulation ratio, UdcFor PWM inverter DC voltage,For event
Network voltage during barrier,For load voltage,For load voltage adjusted, IlFor electric current, the ω on serial coupling capacitor C
=2 π f, f be fundamental frequency be equal to 50Hz, ω be angular speed,For voltage on serial coupling capacitor CWith filter inductance Lf
Upper voltageThe sum of (i.e.Expression vector with point on head, hereWithAll indicate to
Amount), ULCCIndicate vectorAmplitude size, α beWithVector angle, α ' be offset voltage phase adjusted,It is for power-factor angle, γWithAngle,For dynamic electric voltage recovery device injecting compensating voltage,After adjustment
Dynamic electric voltage recovery device injecting compensating voltage.
The beneficial effects of the present invention are: the present invention is under peer system parametric environmental, due to depositing for serial coupling capacitor C
By rationally designing voltage on serial coupling capacitor CSize, it is possible to reduce PWM inverter output voltageAnd by
In the reduction of PWM inverter output voltage, so as to realize PWM inverter capacity and direct current after serial coupling capacitor C
The reduction of side voltage class, while reducing equipment cost and system loss.The present invention is mended under same operating condition using least energy
When repaying strategy, the fundamental wave virtual value of series capacitance coupled mode dynamic electric voltage recovery device PWM inverter output voltage is not only than passing
Dynamic electric voltage recovery device of uniting is much lower, while also lower than using conventional dynamic voltage restorer when same-phase compensation strategy.Pass through
Adjust the size of angle, thus it is possible to vary the size and phase of offset voltage, so that PWM inverter output voltage finally be made to meet
The requirement of its limiting voltage.
Detailed description of the invention
In order to more clearly explain the embodiment of the invention or the technical proposal in the existing technology, to embodiment or will show below
There is attached drawing needed in technical description to be briefly described, it should be apparent that, the accompanying drawings in the following description is only this
Some embodiments of invention for those of ordinary skill in the art without creative efforts, can be with
It obtains other drawings based on these drawings.
Fig. 1 is the topology diagram of series capacitance coupled mode dynamic electric voltage recovery device；
Fig. 2 is the system equivalent circuit diagram of series capacitance coupled mode dynamic electric voltage recovery device；
Fig. 3 a is work polar plot when series capacitance coupled mode dynamic electric voltage recovery device uses pure reactive compensation strategy；
Fig. 3 b is work polar plot when series capacitance coupled mode dynamic electric voltage recovery device uses critical compensation policy；
Fig. 3 c is work polar plot when series capacitance coupled mode dynamic electric voltage recovery device uses minimum active compensation policy；
Fig. 4 is the PWM inverter output voltage comparison diagram under different operating conditions；
Fig. 5 a is the work polar plot of series capacitance coupled mode dynamic electric voltage recovery device when load current is reduced；
The work polar plot of series capacitance coupled mode dynamic electric voltage recovery device when Fig. 5 b is power-factor angle variation；
Fig. 6 is the system control block figure of series capacitance coupled mode dynamic electric voltage recovery device.
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.
Embodiment 1
A kind of series capacitance coupled mode dynamic electric voltage recovery device, the PWM inverter being made of full-controlled device, DC side energy storage
Capacitor Cdc, LC output filter, series transformer T and serial coupling capacitor C constitute.
The LC output filter is by filter inductance LfWith filter capacitor CfIt constitutes.The PWM inverter is by 4 full-control types
Device IGBT and 4 freewheeling diodes are constituted.The DC side storage capacitor CdcIt is mounted on PWM inverter DC side, LC output
Filter is mounted on PWM inverter exchange side；DC side storage capacitor CdcAnode is connected with the collector of the 1st IGBT, direct current
Side storage capacitor CdcThe emitter of cathode and the 3rd IGBT are connected, the emitter phase of LC output filter one end and the 1st IGBT
Even, the LC output filter other end is connected with the collector of the 4th IGBT.The serial coupling capacitor C, which is installed in series, to be filtered
Capacitor CfBetween series transformer T.The series transformer T by the series capacitance coupled mode dynamic electric voltage recovery device and electricity
Net is connected, and in parallel using a by-pass switch K and series transformer T primary side.
A kind of control method of series capacitance coupled mode dynamic electric voltage recovery device controls by the following method: detection power grid electricity
Press UsIf dsag>=0.9, dsagFor the grid voltage sags factor, then do not need to carry out voltage compensation, by-pass switch K closure, series connection
Capacitively coupled dynamic electric voltage recovery device works in stand-by state；If dsag< 0.9, i.e. network voltage fall, and need to carry out
Voltage compensation, by-pass switch K are disconnected, and series capacitance coupled mode dynamic electric voltage recovery device works normally, corresponding to power grid injection
Offset voltage, to maintain the stabilization of load side voltage magnitude.
The offset voltage determines by the following method:
Step S1, after detecting that network voltage falls, the instruction of series capacitance coupled mode dynamic electric voltage recovery device
Voltage, which calculates link, can calculate the finger of the offset voltage of injection power grid needed for series capacitance coupled mode dynamic electric voltage recovery device
Enable value U* dvr；
Step S2 carries out voltage and current double closed-loop to the offset voltage of series capacitance coupled mode dynamic electric voltage recovery device output
Control: compensated voltage instruction value U will be referred to* dvrWith series capacitance coupled mode dynamic electric voltage recovery device injecting compensating voltage UdvrMake
Difference, then by this difference be sent into outer voltage PI controller, by with outer ring proportional integration parameter KP1And KI1Operation is adjusted
Save signal Ir, the adjustment signal I that then obtains outer voltage PI controllerrReference instruction as current inner loop PI controller
Signal and filter inductance LfFilter inductance electric current ILfIt is poor to make, then obtained difference input current inner ring PI controller, passes through
With the proportional integration parameter K of inner ringP2And KI2Operation obtains corresponding adjustment signal；Outer voltage controller and current inner loop control
Device processed is not a part in actual circuit structure, but a technical term for introducing control strategy, belongs to existing skill
Art does not repeat them here；
Obtained adjustment signal is sent into driving circuit and generates corresponding driving signal control PWM inverter by step S3, from
And the offset voltage needed for series capacitance coupled mode dynamic electric voltage recovery device is generated.
During series capacitance coupled mode dynamic electric voltage recovery device exports offset voltage, to guarantee when load fluctuates
PWM inverter output voltage is without departing from its output limit voltage value Uinv-max, need to detect PWM inverter output voltage Uinv's
Size, if Uinv≤Uinv-max, then it represents that PWM inverter output voltage is without departing from its output limit voltage value, series capacitance coupling
Type dynamic electric voltage recovery device can safe and stable operation without carrying out angular adjustment obtain the instruction value U of offset voltage* dvr=
Udvr, UdvrFor series capacitance coupled mode dynamic electric voltage recovery device injecting compensating voltage；If Uinv> Uinv-max, then it represents that PWM inversion
Device output voltage has exceeded its output limit voltage value, for the safe and stable operation for guaranteeing device, needs to load voltage UlInto
Row angle is the adjusting of δ, by the size for adjusting angle δ, thus it is possible to vary the size and phase of offset voltage, and it is adjusted meter
Calculation obtains the instruction value U of offset voltage* dvr=Udvr′, Udvr′It is injected for series capacitance coupled mode dynamic electric voltage recovery device after adjustment
Offset voltage size, so that PWM inverter output voltage finally be made to meet its limiting voltage requirement.
The size by adjusting angle δ, thus it is possible to vary the method for offset voltage size and phase are as follows:
Here, PWM inverter output voltage UinvMeet condition
Uinv≤M·Udc (1)
Then the exportable extreme voltage values of available PWM inverter are Uinv-max=MUdc；
According toWithBetween relationship, δ can derive by following formula
ULCC=(1/ ω C- ω Lf)·Il (2)
After adjusting angle δ has been determined, the size of dynamic electric voltage recovery device injecting compensating voltage after available adjustment
For
It is possible to further obtainWithAngle γ be
Thus, offset voltage phase adjusted is
By formula (5), (6) it is found that the size for passing through adjusting angle δ, thus it is possible to vary the size and phase of offset voltage, thus
Finally PWM inverter output voltage is made to meet its limiting voltage requirement.
Fig. 1 is a kind of series capacitance coupled mode dynamic electric voltage recovery device proposed by the present invention.The structure is by full-controlled device
The PWM inverter of composition, DC side storage capacitor Cdc, LC output filter, series transformer T and serial coupling capacitor C structure
At.DC side storage capacitor CdcEnergy support is provided for series capacitance coupled mode dynamic electric voltage recovery device offset voltage；LC output
Filter is filtered PWM inverter output, and the harmonic content of offset voltage is made to reach requirement；Serial coupling capacitor C series connection
It is mounted on filter capacitor CfBetween series transformer T, it is capable of providing the electricity for increasing 90 ° of lagging load electric current
Press UC, so that series capacitance coupled mode dynamic electric voltage recovery device can be significantly reduced when using minimal energy compensation strategy
The output voltage of PWM inverter to be effectively reduced the capacity and DC voltage grade of PWM inverter, and may be used also
To undertake a part of capacitive reactive power, have an essential distinction with the structure in patent CN201410499807.4, and the patent without
Method realizes that the present invention can be significantly reduced this function of PWM inverter output voltage when using minimal energy compensation strategy；
The offset voltage that series capacitance coupled mode dynamic electric voltage recovery device exports is coupled in power grid by series transformer T.
Wherein: LC output filter is by filter inductance LfWith filter capacitor CfIt constitutes, due to the design of serial coupling capacitor C
Will not influence its filter effect, and the damping capacity of high-frequency resonant can be increased, thus preferably to PWM inverter export into
Row filtering makes the power quality of series capacitance coupled mode dynamic electric voltage recovery device output offset voltage reach requirement；PWM inverter
It is made of 4 wholly-controled device IGBT and 4 freewheeling diodes, DC voltage is reverse into required alternating voltage, due to
The addition of serial coupling capacitor C, so that series capacitance coupled mode dynamic electric voltage recovery device is when using minimal energy compensation strategy,
PWM inverter can choose lesser capacity and DC voltage；DC side storage capacitor CdcIt is mounted on PWM inverter direct current
Side provides energy support for series capacitance coupled mode dynamic electric voltage recovery device offset voltage, supports series capacitance coupled mode dynamic
The normal work of voltage restorer；Series capacitance coupled mode dynamic electric voltage recovery device is connected by series transformer T with power grid, string
The offset voltage of connection capacitively coupled dynamic electric voltage recovery device output is coupled in power grid.
In Fig. 2, ULFor the voltage on filter inductance, UCFor the voltage on serial coupling capacitor C, ZlTo load equivalent impedance.
In Fig. 3, according to the difference of grid voltage sags depth, series capacitance coupled mode dynamic electric voltage recovery device works three
Under the different mode of kind, comprising: pure reactive compensation Fig. 3 a, critical compensation Fig. 3 b and minimum active compensation Fig. 3 c.
Wherein,For load voltage,For load current,For network voltage during failure,For dynamic electric voltage recovery
Device injecting compensating voltage,For the voltage on serial coupling capacitor C,For filter inductance LfOn voltage,For series capacitance
The PWM inverter output voltage of coupled mode dynamic electric voltage recovery device,For power-factor angle, α isWithAngle, θ is
WithAngle, β isWithAngle.
If specified network voltage is Usref, the grid voltage sags factor are as follows:
dsag=Us/Usref (1-1)
Then network voltage during failure are as follows:
Us=dsagUsref (1-2)
The size and angle of series capacitance coupled mode dynamic electric voltage recovery device injecting compensating voltage are respectively as follows:
Wherein,
Thus, the PWM inverter output voltage of series capacitance coupled mode dynamic electric voltage recovery device is
Wherein, the π of ω=2 f, f are that fundamental frequency is equal to 50Hz, and ω is angular speed.
By formula (1-5) as it can be seen that under peer system parametric environmental, due to the presence of serial coupling capacitor C, by rationally setting
MeterSize, it is possible to reduce PWM inverter output voltageAgain due to PWM inverter output voltage reduction, so as to
To realize the reduction of PWM inverter capacity and DC voltage grade after serial coupling capacitor C, while reducing equipment cost
And system loss.
In Fig. 4, the broken line with triangle indicates that conventional dynamic voltage restorer dynamic electric voltage recovery device is mended using least energy
PWM inverter output voltage when strategy is repaid, band dot broken line indicates that conventional dynamic voltage restorer uses same-phase compensation strategy
When PWM inverter output voltage, the square broken line of band indicates series capacitance coupled mode dynamic electric voltage recovery device using minimum energy
Measure PWM inverter output voltage when compensation policy.Here, grid voltage amplitude is set forth and falls 10% to 50% operating condition
When, the fundamental wave virtual value of PWM inverter output voltage in the case of above-mentioned three kinds.By comparison as can be seen that under same operating condition, adopt
When with minimal energy compensation strategy, the fundamental wave of series capacitance coupled mode dynamic electric voltage recovery device PWM inverter output voltage is effective
It is worth not only more much lower than conventional dynamic voltage restorer while also more extensive than using conventional dynamic voltage when same-phase compensation strategy
Multiple device is low, this directly confirms the superiority of series capacitance coupled mode dynamic electric voltage recovery device proposed by the invention.
In Fig. 5 a and Fig. 5 b, δ is to adjust angle,For voltage on serial coupling capacitor CWith filter inductance LfIt powers on
PressureThe sum of,For load voltage adjusted,For dynamic electric voltage recovery device injecting compensating voltage adjusted, α ' is to adjust
Offset voltage phase after whole, γ areWithAngle,For the limiting value of PWM inverter output voltage.
Load fluctuation may be such that PWM inverter output voltage beyond its output limit voltage value, needs to carry out at this time
Corresponding angular adjustment, to guarantee that PWM inverter output voltage within its limit range, and makes series capacitance coupled mode
Dynamic electric voltage recovery device works in the minimal energy compensation state within the scope of fan-out capability.
Here, PWM inverter output voltage UinvMeet condition
Uinv≤M·Udc (1)
In formula (1), M is modulation ratio, UdcFor the DC voltage of PWM inverter.Then available PWM inverter can be defeated
Extreme voltage values out are Uinv-maX=MUdc。
According toWithBetween relationship, δ can derive by following formula
ULCC=(1/ ω C- ω Lf)·Il (2)
After adjusting angle δ has been determined, available offset voltage size adjusted is
It is possible to further obtainWithAngle γ be
Thus, offset voltage phase adjusted is
By formula (5), (6) it is found that the size for passing through adjusting angle δ, thus it is possible to vary the size and phase of offset voltage, thus
Finally PWM inverter output voltage is made to meet its limiting voltage requirement.
In Fig. 6, IlFor the electric current on serial coupling capacitor C；KPWMFor PWM inverter equivalent gain, for simplifying the analysis this
In take KPWMDifferentiating in frequency domain is indicated for 1, s, and 1/s indicates the integral operation in frequency domain.
The foregoing is merely illustrative of the preferred embodiments of the present invention, is not intended to limit the scope of the present invention.It is all
Any modification, equivalent replacement, improvement and so within the spirit and principles in the present invention, are all contained in protection scope of the present invention
It is interior.
Claims (10)
1. a kind of series capacitance coupled mode dynamic electric voltage recovery device, which is characterized in that the PWM inverter that is made of full-controlled device,
DC side storage capacitor Cdc, LC output filter, series transformer T and serial coupling capacitor C constitute.
2. a kind of series capacitance coupled mode dynamic electric voltage recovery device according to claim 1, which is characterized in that the LC is defeated
Filter is by filter inductance L outfWith filter capacitor CfIt constitutes.
3. a kind of series capacitance coupled mode dynamic electric voltage recovery device according to claim 1, which is characterized in that the PWM
Inverter is made of 4 wholly-controled device IGBT and 4 freewheeling diodes.
4. a kind of series capacitance coupled mode dynamic electric voltage recovery device according to claim 3, which is characterized in that the direct current
Side storage capacitor CdcIt is mounted on PWM inverter DC side, LC output filter is mounted on PWM inverter exchange side；DC side storage
It can capacitor CdcAnode is connected with the collector of the 1st IGBT, DC side storage capacitor CdcThe emitter of cathode and the 3rd IGBT
It is connected, LC output filter one end is connected with the emitter of the 1st IGBT, the LC output filter other end and the 4th IGBT's
Collector is connected.
5. a kind of series capacitance coupled mode dynamic electric voltage recovery device according to claim 2, which is characterized in that the series connection
Coupled capacitor C is installed in series in filter capacitor CfBetween series transformer T.
6. a kind of series capacitance coupled mode dynamic electric voltage recovery device according to claim 1-5, which is characterized in that
The series capacitance coupled mode dynamic electric voltage recovery device is connected by the series transformer T with power grid, and is opened using a bypass
It closes K and series transformer T primary side is in parallel.
7. a kind of control method of series capacitance coupled mode dynamic electric voltage recovery device as claimed in claim 6, which is characterized in that
Detect network voltage UsIf dsag>=0.9, dsagFor the grid voltage sags factor, then do not need to carry out voltage compensation, by-pass switch
K closure, series capacitance coupled mode dynamic electric voltage recovery device work in stand-by state；If dsag< 0.9, i.e. network voltage fall
It falls, needs to carry out voltage compensation, by-pass switch K is disconnected, and series capacitance coupled mode dynamic electric voltage recovery device works normally, to power grid
Corresponding offset voltage is injected, to maintain the stabilization of load side voltage magnitude.
8. a kind of control method of series capacitance coupled mode dynamic electric voltage recovery device according to claim 7, feature exist
In the offset voltage determines by the following method:
Step S1, after detecting that network voltage falls, the command voltage of series capacitance coupled mode dynamic electric voltage recovery device
The instruction value of the offset voltage of injection power grid needed for series capacitance coupled mode dynamic electric voltage recovery device can be calculated by calculating link
U* dvr；
Step S2 carries out voltage and current double closed-loop control to the offset voltage of series capacitance coupled mode dynamic electric voltage recovery device output
System: compensated voltage instruction value U will be referred to* dvrWith series capacitance coupled mode dynamic electric voltage recovery device injecting compensating voltage UdvrIt is poor to make,
Then by this difference be sent into outer voltage PI controller, by with outer ring proportional integration parameter KP1And KI1Operation is adjusted
Signal Ir, the adjustment signal I that then obtains outer voltage PI controllerrReference instruction as current inner loop PI controller is believed
Number with filter inductance LfFilter inductance electric current ILfIt is poor to make, then obtained difference input current inner ring PI controller, by with
The proportional integration parameter K of inner ringP2And KI2Operation obtains corresponding adjustment signal；
Obtained adjustment signal is sent into driving circuit and generates corresponding driving signal control PWM inverter, to make by step S3
Obtain the offset voltage needed for series capacitance coupled mode dynamic electric voltage recovery device generates.
9. a kind of control method of series capacitance coupled mode dynamic electric voltage recovery device according to claim 7 or 8, feature
It is, during series capacitance coupled mode dynamic electric voltage recovery device exports offset voltage, to guarantee the PWM when load fluctuates
Inverter output voltage is without departing from its output limit voltage value Uinv-max, need to detect PWM inverter output voltage UinvIt is big
It is small, if Uinv≤Uinv-max, then it represents that PWM inverter output voltage is without departing from its output limit voltage value, series capacitance coupled mode
Dynamic electric voltage recovery device can safe and stable operation without carrying out angular adjustment obtain the instruction value U of offset voltage* dvr=Udvr；
If Uinv> Uinv-max, then it represents that PWM inverter output voltage has exceeded its output limit voltage value, for the safety for guaranteeing device
Stable operation is needed to load voltage UlThe adjusting that angle is δ is carried out, by the size for adjusting angle δ, thus it is possible to vary compensation electricity
The size and phase of pressure, and it is adjusted the instruction value U that offset voltage is calculated* dvr=Udvr′, Udvr′For series electrical after adjustment
Hold coupled mode dynamic electric voltage recovery device injecting compensating voltage swing, so that PWM inverter output voltage finally be made to meet its pole
It rations the power supply pressure request.
10. a kind of control method of series capacitance coupled mode dynamic electric voltage recovery device according to claim 9, feature exist
In the size by adjusting angle δ, thus it is possible to vary the method for offset voltage size and phase are as follows:
Here, PWM inverter output voltage UinvMeet condition
Uinv≤M·Udc (1)
Then the exportable extreme voltage values of available PWM inverter are Uinv-max=MUdc；
According toWithBetween relationship, δ can derive by following formula
ULCC=(1/ ω C- ω Lf)·Il (2)
After adjusting angle δ has been determined, the size of dynamic electric voltage recovery device injecting compensating voltage is after available adjustment
It is possible to further obtainWithAngle γ be
Thus, offset voltage phase adjusted is
Wherein, M is modulation ratio, UdcFor PWM inverter DC voltage,For network voltage during failure,For load electricity
Pressure,For load voltage adjusted, IlFor electric current, the π of ω=2 f on serial coupling capacitor C, f is equal to for fundamental frequency
50Hz, ω be angular speed,For voltage on serial coupling capacitor CWith filter inductance LfUpper voltageThe sum of, ULCCIt indicates
VectorAmplitude size, α beWithVector angle, α ' be offset voltage phase adjusted,For power factor
Angle, γ areWithAngle,For dynamic electric voltage recovery device injecting compensating voltage,For dynamic electric voltage adjusted
Restorer injecting compensating voltage.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910716064.4A CN110365025B (en) | 2019-08-05 | 2019-08-05 | Series capacitance coupling type dynamic voltage restorer and control method thereof |
Applications Claiming Priority (1)
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111416362A (en) * | 2020-03-26 | 2020-07-14 | 广东电网有限责任公司 | Dynamic voltage restorer of winding structure and control method thereof |
| CN111884235A (en) * | 2020-08-05 | 2020-11-03 | 珠海万力达电气自动化有限公司 | Control method of dynamic voltage restorer |
| CN113315133A (en) * | 2021-05-31 | 2021-08-27 | 广东电网有限责任公司广州供电局 | Control method and device of voltage sag treatment device and electronic equipment |
| CN113872218A (en) * | 2021-10-10 | 2021-12-31 | 费籁电气(上海)有限公司 | Method for analyzing running characteristic of series capacitance coupling type dynamic voltage restorer |
| CN114094808A (en) * | 2021-12-01 | 2022-02-25 | 湖南大学 | Series-parallel connection integrated multifunctional converter topological structure and control method thereof |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN201156669Y (en) * | 2008-01-08 | 2008-11-26 | 江苏省电力试验研究院有限公司 | Series capacity direct coupling type dynamic voltage recovery device |
| US20090224729A1 (en) * | 2008-02-28 | 2009-09-10 | Jian Duo Li | Dynamic voltage compensator used in three-phase power supply system |
| CN103441504A (en) * | 2013-08-15 | 2013-12-11 | 东南大学 | Series compensation low-voltage ride-through device with self-charging function and control method thereof |
| CN203608077U (en) * | 2013-12-12 | 2014-05-21 | 国家电网公司 | Filter circuit for serial-connection parts of SSSC (static synchronous series compensator) and UPQC (unified power quality controller) |
| CN107317343A (en) * | 2017-08-24 | 2017-11-03 | 长沙理工大学 | Efficient cascade H bridge types dynamic electric voltage recovery device and its control method |
-
2019
- 2019-08-05 CN CN201910716064.4A patent/CN110365025B/en active Active
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN201156669Y (en) * | 2008-01-08 | 2008-11-26 | 江苏省电力试验研究院有限公司 | Series capacity direct coupling type dynamic voltage recovery device |
| US20090224729A1 (en) * | 2008-02-28 | 2009-09-10 | Jian Duo Li | Dynamic voltage compensator used in three-phase power supply system |
| CN103441504A (en) * | 2013-08-15 | 2013-12-11 | 东南大学 | Series compensation low-voltage ride-through device with self-charging function and control method thereof |
| CN203608077U (en) * | 2013-12-12 | 2014-05-21 | 国家电网公司 | Filter circuit for serial-connection parts of SSSC (static synchronous series compensator) and UPQC (unified power quality controller) |
| CN107317343A (en) * | 2017-08-24 | 2017-11-03 | 长沙理工大学 | Efficient cascade H bridge types dynamic electric voltage recovery device and its control method |
Non-Patent Citations (4)
| Title |
|---|
| C.S. CHANG等: "Simulation and analysis of series voltage restorers (SVR) for voltage sag relief", 《2000 IEEE POWER ENGINEERING SOCIETY WINTER MEETING. CONFERENCE PROCEEDINGS (CAT. NO.00CH37077)》 * |
| CHUNMING TU等: "New Adaptive Scheme for Dynamic Voltage Restorer to Voltage Sag Compensation and Flexible Self-recovery", 《2018 IEEE INTERNATIONAL POWER ELECTRONICS AND APPLICATION CONFERENCE AND EXPOSITION (PEAC)》 * |
| 张新闻等: "电容耦合型动态电压恢复器参数建模与控制", 《电工技术学报》 * |
| 罗培等: "一种中性线串接电容的LC耦合型配电网静止同步补偿器拓扑结构", 《电网技术》 * |
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111416362A (en) * | 2020-03-26 | 2020-07-14 | 广东电网有限责任公司 | Dynamic voltage restorer of winding structure and control method thereof |
| CN111416362B (en) * | 2020-03-26 | 2022-01-21 | 广东电网有限责任公司 | Dynamic voltage restorer of winding structure and control method thereof |
| CN111884235A (en) * | 2020-08-05 | 2020-11-03 | 珠海万力达电气自动化有限公司 | Control method of dynamic voltage restorer |
| CN113315133A (en) * | 2021-05-31 | 2021-08-27 | 广东电网有限责任公司广州供电局 | Control method and device of voltage sag treatment device and electronic equipment |
| CN113872218A (en) * | 2021-10-10 | 2021-12-31 | 费籁电气(上海)有限公司 | Method for analyzing running characteristic of series capacitance coupling type dynamic voltage restorer |
| CN114094808A (en) * | 2021-12-01 | 2022-02-25 | 湖南大学 | Series-parallel connection integrated multifunctional converter topological structure and control method thereof |
| CN114094808B (en) * | 2021-12-01 | 2024-04-26 | 湖南大学 | Multi-functional converter topology structure integrated in series-parallel connection and control method thereof |
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