CN106849103A - Transformerless type single-phase dynamic voltage compensator based on HVDC Modulation - Google Patents
Transformerless type single-phase dynamic voltage compensator based on HVDC Modulation Download PDFInfo
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- CN106849103A CN106849103A CN201710124866.7A CN201710124866A CN106849103A CN 106849103 A CN106849103 A CN 106849103A CN 201710124866 A CN201710124866 A CN 201710124866A CN 106849103 A CN106849103 A CN 106849103A
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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
- H02J3/12—Circuit arrangements for ac mains or ac distribution networks for adjusting voltage in ac networks by changing a characteristic of the network load
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Abstract
The invention provides a kind of transformerless type single-phase dynamic voltage compensator based on HVDC Modulation, including：Charging module, energy-storage module, inversion module and AC AC conversion modules；Wherein charging module, for realizing charging operations of the power network to single-phase dynamic voltage compensator；Energy-storage module, for that can store power network is charged to single-phase dynamic voltage compensator；Inversion module, for being industrial-frequency alternating current by the DC conversion stored by energy-storage module；AC AC conversion modules, the alternating current post-compensation that the industrial-frequency alternating current for inversion module to be converted is converted into being matched with power network gives power network loop.Present invention introduces Boost type HVDC Modulation AC AC converters as AC boosting transform part, realize that transless injects using electric capacity, compared with general Transformer-free DVR, active switch device (IGBT) number is reduced, it is capable of achieving flexibly adjustable secondary booster conversion, booster tension compensation ability.
Description
Technical field
The present invention relates to electronic power convertor and power quality field, in particular it relates to be based on HVDC Modulation without change
Depressor formula single-phase dynamic voltage compensator.
Background technology
Although current electrical power trans mission/distribution system has been provided with reliability very high, the unusual fluctuations of voltage level have still been difficult to
Avoid entirely.The ANOMALOUS VARIATIONS of any voltage waveform may all influence user side in power network electrically and electronic equipment normal operation.
Electrical load need power network provide possess good sinusoidal waveform, frequency stabilization, high level of synchronization, effective value stabilization voltage supply with
Persistently meet production and living demand.And over-pressed, under-voltage and power failure is considered as the subject matter for influenceing the quality of power supply.Electric power
Some important loads are very sensitive for the brief fluctuations of voltage level in system.Dynamic voltage compensator (Dynamic
Voltage Restorer, DVR) belong to flexible AC transmission (Flexible Alternative Current
Transmission Systems, FACTS) power electronic equipment in system, its major function is occur voltage in power network
The of short duration normal electricity for maintaining specific load is supplied in the case of temporary drop or power failure.The equipment is mainly installed on industrial manufacture
Industry enterprise and important public place, to avoid by the sudden production disruption and other potential risks for fluctuating and causing of powering.
DC energy storage device and inverter are included in general DVR devices, its effect is respectively in dc bus side storage energy
AC power frequency output injection power network is converted into by DC energy storage.There is coupling device mutual between DVR main circuits and supply line
Connection, usually Industrial Frequency Transformer or series connection accesses the capacitor of power circuit.It is traditional according to series connection injection transformer is whether there is
DVR structures can be divided into transformer type and the major class of Transformer-free two, and each type can divide again according to charging modes are different
It is tandem type and Serial-Parallel Type, shown in its typical structure such as Fig. 1 (a), Fig. 1 (b) and Fig. 2 (a), Fig. 2 (b).
DVR as shown in Fig. 1 (a) uses series transformer T1As the coupling device between inverter and alternating current circuit,
The transformer is as charging transformer, and as injection transformer.When systems are functioning properly, by-pass switch S closures, power network
Voltage directly acts on load two ends；When DVR compensated line voltage dips, by-pass switch S disconnects rapidly, by bridge-type inverter
The ac output voltage of generation by after the boosting inverter of injection transformer connect line attachment in, with circuit itself inherent voltage
It is load supplying after superposition；When device charges, bridge circuit is operated in PWM rectification states, is deposited from power circuit energy absorption
It is stored in DC energy storage device.
DVR operation principles shown in Fig. 1 (b) are similar with circuit shown in Fig. 1 (a), and difference is that increased in addition for filling
Put the shunt transformer T of charging2, realize that compensation loop separates with charge circuit so that can continue from electricity in compensation process
Net energy absorption, lifting device compensation ability.
DVR shown in Fig. 2 (a) uses the Transformer-free topological structure based on series capacitance coupling, when system is normally transported
During row, by-pass switch S closures, line voltage directly acts on load two ends；When DVR compensated line voltage dips, bypass is opened
Close S to disconnect rapidly, the ac output voltage produced by bridge-type inverter passes through in capacitances in series line attachment, solid with circuit itself
Have after voltage superposition for load supplying；When device charges, bridge circuit is operated in PWM rectification states, via series coupled electricity
Appearance is stored in DC energy storage device from power circuit energy absorption.
DVR operation principles shown in Fig. 2 (b) are similar with circuit shown in Fig. 2 (a), and difference is that increased in addition for filling
Put the shunt transformer T of charging2, realize that compensation loop separates with charge circuit so that can continue from electricity in compensation process
Net energy absorption, lifting device compensation ability.
Circuit structure in above-mentioned Fig. 1 (a), Fig. 1 (b) and Fig. 2 (a), Fig. 2 (b) causes S.Preetha, R.Bhavani,
N.R.Prabha,Design of Ultra-capacitor based DVR for Power,in Proc.of ICCPCT,
2016 and V.Ansal, K.Ravikumar, P.Parthiban.Transformerless Dynamic Voltage
Restorer for Voltage Sag Mitigation,in Proc.of PESTSE,2016.Carried respectively in this two documents
Go out based on transformer coupled conventional three-phase DVR devices and more typical Transformer-free DVR circuits, wherein, based on transformation
The conventional three-phase DVR devices of device coupling have stronger compensation ability, but more heavy, and accommodative facility is poor；And it is typical
Transformer-free DVR circuits, charge-compensation loop unification, per mutually contain 4 active switch devices, using Capacitance Coupled, do not have
There is AC boosting ability., system balance ability identical per phase active switch device count is compared with the technical scheme in the application
Difference, voltage-regulation flexibility ratio is low.
Generally speaking, according to the difference of DVR offset voltage injection modes, transformer type and Transformer-free can be classified as
Two classes.Due to the boosting that there is transformer, transformer type DVR compensation abilitys are stronger.But due to Industrial Frequency Transformer volume
Huge and relatively costly, there are itself heavy, shortcomings such as expensive in type DVR devices, be not suitable for middle low power
Close.In addition contravarianter voltage output adjustable range is limited (being limited by the quality of power supply, modulation ratio can not be too small), and Industrial Frequency Transformer
No-load voltage ratio be fixed, therefore the output voltage range of type DVR devices is limited, and regulation underaction is convenient.Transformer-free
DVR is free of coupling transformer, therefore volume weight is greatly lowered, and cost is relatively low.But due to voltage source inverter
(Voltage Source Inverter, VSI) is buck topology, in the case where transformer secondary boosting is not injected into, is
The offset voltage amplitude for exporting of uniting seriously is limited by DC bus-bar voltage, compensation ability relative deficiency.Simultaneously because ensuring electricity
VSI circuit output voltages are limited in scope on the premise of energy quality, and type DVR regulations control still owes flexible.
The content of the invention
For defect of the prior art, it is an object of the invention to provide a kind of transformerless type list based on HVDC Modulation
Phase dynamic voltage compensator.
According to the transformerless type single-phase dynamic voltage compensator based on HVDC Modulation that the present invention is provided, including：Charge
Module, energy-storage module, inversion module and AC-AC conversion modules；Wherein：
The charging module, for realizing charging operations of the power network to single-phase dynamic voltage compensator；
The energy-storage module, for that can store power network is charged to single-phase dynamic voltage compensator；
The inversion module, for being industrial-frequency alternating current by the DC conversion stored by energy-storage module；
The AC-AC conversion modules, the industrial-frequency alternating current for inversion module to be converted is converted into the friendship matched with power network
The electric post-compensation of stream gives power network loop.
Preferably, the charging module includes：Charging contactor B1, charging inductance Lin, charging resistor Rin, commutation diode
D1And commutation diode D2, the charging contactor B1One end be connected to node N0, the charging contactor B1The other end
Sequentially pass through charging inductance Lin, charging resistor RinAfterwards respectively with commutation diode D1Positive pole, commutation diode D2Negative pole phase
Even；The commutation diode D1Negative pole be connected to node N4, the commutation diode D2Positive pole be connected to node N5；Wherein
Node N0, node N1It is connected to the two ends of single-phase alternating current.
Preferably, the energy-storage module includes：Capacitor C1With capacitor C2, the capacitor C1Two ends connect respectively
To node N4With node N1；The capacitor C2Two ends be respectively connecting to node N1With node N5；Wherein capacitor C1And electric capacity
Device C2Capacitance according to the rated capacity and offset of single-phase dynamic voltage compensator determine.
Preferably, the inversion module includes：Switching tube S1, switching tube S2, filter inductance L1And filter capacitor C3；Open
Close pipe S1Colelctor electrode be connected to node N4, switching tube S2Emitter stage be connected to node N5, the filter inductance L1One end point
Other connecting valve pipe S1Emitter stage and switching tube S2Colelctor electrode, filter inductance L1The other end pass through filter capacitor C3Connection
To node N1。
Preferably, the AC-AC conversion modules include：Energy storage inductor L2, coupled capacitor C4, by-pass switch unit and two
Individual two-way switch control unit；Wherein：The by-pass switch unit includes：IGCT THY1 and IGCT THY2, IGCT
The positive pole of THY1 is respectively connecting to node N1With the negative pole of IGCT THY2, the negative pole of IGCT THY1 is respectively connecting to node N3
With the positive pole of IGCT THY2；
Two-way switch control unit includes：Four diodes, switching tube S3Or switching tube S4, the S of switching tube3Or switching tube
S4Colelctor electrode connect the negative pole of first diode and second diode, the S of switching tube respectively3Or switching tube S4Transmitting
Pole connects the positive pole of the 3rd diode and the 4th diode respectively, the positive pole of first diode and the 3rd diode
Negative pole is connected and constitutes one end of two-way switch control unit, second positive pole of diode and the 4th negative pole phase of diode
Connect and constitute the other end of two-way switch control unit；One end of one of two-way switch control unit is connected to node N1,
And the other end of the two-way switch control unit is connected to energy storage inductor L2One end；The one of another two-way switch control unit
End is connected to node N3, and the other end of the two-way switch control unit is connected to energy storage inductor L2One end；Energy storage inductor L2's
The other end is connected to node N2, the coupled capacitor C4Two ends difference connecting node N1With node N3。
Preferably, switching tube S1, switching tube S2, switching tube S3, switching tube S4Using full-controlled switch device.
Preferably, AC-AC conversion modules are Boost type HVDC Modulation AC-AC converter circuits, for being same as realizing DVR
The flexible gain-adjusted for exporting AC compensation voltage couples injection with transless.
Compared with prior art, the present invention has following beneficial effect：
1st, the transformerless type single-phase dynamic voltage compensator based on HVDC Modulation in the present invention is logical using charging-injecting
The compact main circuit topological structure that road is separated, introduces Boost type HVDC Modulation AC-AC converters and is converted as AC boosting
Link, realizes that transless injects using electric capacity, is compared with general Transformer-free DVR, active switch device (IGBT) number
Reduce, cost reduction.
2nd, the transformerless type single-phase dynamic voltage compensator based on HVDC Modulation in the present invention introduces Boost type direct current
Modulation AC-AC converters, are capable of achieving flexibly adjustable secondary booster conversion, booster tension compensation ability.
3rd, the transformerless type single-phase dynamic voltage compensator based on HVDC Modulation in the present invention increases a control and becomes
Amount, improves system control freedom degree, strengthens flexibility.
4th, the transformerless type single-phase dynamic voltage compensator based on HVDC Modulation in the present invention is noted using Capacitance Coupled
Enter, without Industrial Frequency Transformer, volume weight is small, low cost, is particularly suited for single-phase low-power occasion.
Brief description of the drawings
The detailed description made to non-limiting example with reference to the following drawings by reading, further feature of the invention,
Objects and advantages will become more apparent upon：
Fig. 1 (a) is tandem transformer injection type DVR structure charts；
Fig. 1 (b) is series-parallel transformer injection type DVR structure charts；
Fig. 2 (a) is tandem Transformer-free DVR structure charts；
Fig. 2 (b) is series-parallel Transformer-free DVR structure charts；
Fig. 3 is the transformerless type single-phase dynamic voltage compensator main circuit schematic diagram based on HVDC Modulation；
Fig. 4 is Boost type HVDC Modulation AC-AC converter topology structure charts；
Fig. 5 (a), Fig. 5 (b), Fig. 5 (c), Fig. 5 (d) are respectively the equivalent circuit diagram being operated under four kinds of patterns；
Fig. 6 is the voltage dip compensation effect simulation result schematic diagram of three cycle 30%；
Fig. 7 is the voltage dip compensation effect simulation result schematic diagram of three cycle 60%；
Fig. 8 is three cycle 100% voltage dip (power failure) compensation effect simulation result schematic diagram.
Specific embodiment
With reference to specific embodiment, the present invention is described in detail.Following examples will be helpful to the technology of this area
Personnel further understand the present invention, but the invention is not limited in any way.It should be pointed out that to the ordinary skill of this area
For personnel, without departing from the inventive concept of the premise, some changes and improvements can also be made.These belong to the present invention
Protection domain.
According to the transformerless type single-phase dynamic voltage compensator based on HVDC Modulation that the present invention is provided, including：Charge
Module, energy-storage module, inversion module and AC-AC conversion modules；Wherein：
The charging module, for realizing charging operations of the power network to single-phase dynamic voltage compensator；
The energy-storage module, for that can store power network is charged to single-phase dynamic voltage compensator；
The inversion module, for being industrial-frequency alternating current by the DC conversion stored by energy-storage module；
The AC-AC conversion modules, the industrial-frequency alternating current for inversion module to be converted is converted into the friendship matched with power network
The electric post-compensation of stream gives power network loop.
The charging module includes：Charging contactor B1, charging inductance Lin, charging resistor Rin, commutation diode D1And
Commutation diode D2, the charging contactor B1One end be connected to node N0, the charging contactor B1The other end pass through successively
Overcharge inductance Lin, charging resistor RinAfterwards respectively with commutation diode D1Positive pole, commutation diode D2Negative pole be connected；It is described
Commutation diode D1Negative pole be connected to node N4, the commutation diode D2Positive pole be connected to node N5；Its interior joint N0, section
Point N1It is connected to the two ends of single-phase alternating current.
Specifically, it is necessary to be charged after DVR startup optimizations or completion primary voltage compensating movement.Now contact
Device B1Closure, by LinWith RinSingle-phase AC voltage is put on into node N0And N1Between, by diode D1、D2What is constituted is whole
Stream bridge arm is completed for storage capacitor C1And C2Charging operations.Charging terminates rear contactor B1Disconnect.
The energy-storage module includes：Capacitor C1With capacitor C2, the capacitor C1Two ends be respectively connecting to node N4
With node N1；The capacitor C2Two ends be respectively connecting to node N1With node N5；Wherein capacitor C1With capacitor C2Electricity
Capacitance is determined according to the rated capacity and offset of single-phase dynamic voltage compensator.
The inversion module includes：Switching tube S1, switching tube S2, filter inductance L1And filter capacitor C3；Switching tube S1's
Colelctor electrode is connected to node N4, switching tube S2Emitter stage be connected to node N5, the filter inductance L1One end connect out respectively
Close pipe S1Emitter stage and switching tube S2Colelctor electrode, filter inductance L1The other end pass through filter capacitor C3It is connected to node N1。
The AC-AC conversion modules include：Energy storage inductor L2, coupled capacitor C4, by-pass switch unit and two two-way openeds
Close control unit；Wherein：The by-pass switch unit includes：IGCT THY1 and IGCT THY2, the positive pole of IGCT THY1
It is respectively connecting to node N1With the negative pole of IGCT THY2, the negative pole of IGCT THY1 is respectively connecting to node N3And IGCT
The positive pole of THY2；
Two-way switch control unit includes：Four diodes, switching tube S3Or switching tube S4, the S of switching tube3Or switching tube
S4Colelctor electrode connect the negative pole of first diode and second diode, the S of switching tube respectively3Or switching tube S4Transmitting
Pole connects the positive pole of the 3rd diode and the 4th diode respectively, the positive pole of first diode and the 3rd diode
Negative pole is connected and constitutes one end of two-way switch control unit, second positive pole of diode and the 4th negative pole phase of diode
Connect and constitute the other end of two-way switch control unit；One end of one of two-way switch control unit is connected to node N1,
And the other end of the two-way switch control unit is connected to energy storage inductor L2One end；The one of another two-way switch control unit
End is connected to node N3, and the other end of the two-way switch control unit is connected to energy storage inductor L2One end；Energy storage inductor L2's
The other end is connected to node N2, the coupled capacitor C4Two ends difference connecting node N1With node N3。
Above-mentioned switching tube S1, switching tube S2, switching tube S3, switching tube S4Using full-controlled switch device (IGBT).
Above-mentioned AC-AC conversion modules are Boost type HVDC Modulation AC-AC converter circuits, for being same as realizing that DVR is exported
The flexible gain-adjusted of AC compensation voltage couples injection, the thyristor switch list that wherein THY1 and THY2 is constituted with transless
Unit is responsible for input and the bypass in control DVR compensation loop.
In DVR devices, because voltage source inverter (VSI) circuit is buck topology, output exchange fundametal compoment
Amplitude will be limited by storage capacitor two ends DC voltage.When Voltage Drop continues more long, increase with the compensation time, electricity
Hold energy storage constantly to consume, DC bus-bar voltage continuous decrease, will seriously limit output AC voltage amplitude, and then cause to compensate energy
Power reduction.In transformer type DVR circuits, injection transformer possesses certain boost capability in itself, can solve this problem, but
Device can be caused heavy, volume is larger and expensive.In Transformer-free DVR devices, because without injection transformer, it is impossible to
Exchange secondary booster is carried out, causes equipment replacement ability to be generally limited.Boost type HVDC Modulation is innovatively used in the present invention
AC-AC converters substitute traditional injection transformer, used as AC boosting device.Boost type DC-DC converter is basic non-isolated
Property one of DC-DC converter topology, possess flexible adjustable boosting inverter ability, Boost type HVDC Modulation AC-AC translation circuits
Develop i.e. on the basis of Boost circuit topology.
In the case where PWM switching frequencies are far above AC power frequency, it is considered that input voltage is near in a switch periods
It is input into like the DC voltage for a certain polarity；" direct current " input is somebody's turn to do via converter circuit according to similar certain DC-DC converter
The principle of (being herein Boost circuit) can obtain a certain size (depending on dutycycle), certain polarity and (depend on topological class
Type) " direct current " output.It is clear that the dutycycle is kept into certain power frequency period, you can realize same frequency, a rated transformation ratio
The AC-AC conversion of (depending on dutycycle).It is more than the general principle of HVDC Modulation AC-AC converter techniques.
It may be noted that because switching device has one-way, traditional DC-DC conversion circuit is only applicable to a kind of input pole
Property, it is impossible to it is directly used in AC-AC converting means；Therefore need to be transformed.The method taken is to keep overall topological structure
On the basis of constant, all actively and passively switching devices in circuit are replaced with the two-way switch unit for arranging bridge circuit
Change.Fig. 4 show Boost type HVDC Modulation AC-AC converter topology structures.In the electric current of AC-AC converter breaker in middle units
Direction does not have half power frequency period to change once, but can be with maintained switch undertaken in the presence of rectifier bridge in switch element
The sense of current is always positive.It is f to choose HVDC Modulation switching frequency in this patents=5-10kHz, the frequency is far above work
Frequently, it is believed that input voltage is defined DC voltage in a HVDC Modulation cycle.AC-AC converters are at one as mentioned before
Can be run with the mechanism of approximate DC-DC converter in the HVDC Modulation cycle, its conversion characteristics can also be based on known DC-DC
Converter characteristic is analyzed derivation.Fig. 5 (a), Fig. 5 (b), Fig. 5 (c), Fig. 5 (d) be respectively be operated under four kinds of patterns etc.
Effect circuit diagram.
As input ac voltage uin>When 0：
If S1Conducting, S2Shut-off, then input power is via S1For energy storage inductor L charges, electric capacity C electric discharges provide energy for load
Amount, output voltage uout>Shown in 0, equivalent circuit such as Fig. 5 (a)；
If S1Shut-off, S2Conducting, then energy storage inductor L is via S2For electric capacity C charges, while for load provides energy, output electricity
Pressure uout>Shown in 0, equivalent circuit such as Fig. 5 (b)；
As input ac voltage uin<When 0：
If S1Conducting, S2Shut-off, then input power is via S1For energy storage inductor L charges, electric capacity C electric discharges provide energy for load
Amount is (with uin>The sense of current is opposite when 0), output voltage uout<Shown in 0, equivalent circuit such as Fig. 5 (c)；
If S1Shut-off, S2Conducting, then energy storage inductor L is via S2For electric capacity C charges, while for load provides energy (with uin>0
When the sense of current it is opposite), output voltage uout<Shown in 0, equivalent circuit such as Fig. 5 (d).
It can be seen that for the Boost type HVDC Modulation AC-AC converters shown in Fig. 4, with Boost type DC-DC converter
Similar, voltage gain characteristic is under can trying to achieve its stable state with inductance volt-second balance using capacitance charge balance：
In formula：D is switching tube S1Dutycycle, uoIt is output voltage, uiIt is input voltage.Input ac voltage is handed over output
Stream voltage same frequency, same-phase.Needs are particularly pointed out, because there is Boost type HVDC Modulation AC-AC converters type altogether to open up
Flutter, input voltage uiWith output voltage uoTo measure altogether.
It is assumed that ideal element is in circuit, if ac phase voltage amplitude is Upm, node Nx(represent x-th node) over the ground
Current potential is ux(representing x-th current potential of node)；X is positive integer, then understood according to circuit theory：
Storage capacitor C after charging complete1Voltage UC1For
UC1=u4-u1=UC2=u1-u5=Upm
When electric voltage exception fluctuates to be occurred, DVR inputs carry out voltage compensation, now IGBT device S1And S2Put into operation, structure
Into single-phase electricity potential source type inverter, control to produce the voltage containing sinusoidal fundamental component by PWM, then via L1With C3Constitute
The sinusoidal voltage u of wave filter, output certain frequency and phaseAC(t).Have：
In formula：u1T () is node N1Current potential instantaneous value, u2T () is node N2Current potential instantaneous value, ω0It is electrical network angular frequency, phase
AngleGiven according to voltage compensation demand by control system, amplitude A is determined by modulation degree with storage capacitor voltage, controlled system
Influence.Alternating voltage uACT () is input into as the exchange of rear class Boost type HVDC Modulation AC-AC converters, dutycycle d's
Under control, by common ground boosting inverter, can be in electric capacity C4Two ends obtain the AC compensation voltage u of DVR outputsDVR,
In formula：u3T () is node N3Current potential instantaneous value, boost types in PWM controlling cycles of the d (t) residing for any instant
HVDC Modulation AC-AC converter dutycycle numerical value；
Now load voltage uLOADT () is：
uLOAD(t)=u3(t)-u0(t)=[u3(t)-u1(t)]+[u1(t)-u0(t)]=uDVR(t)+uph(t)
In formula：u0T () is node N0Current potential (ground potential) instantaneous value, uDVRT () is that DVR exports offset voltage instantaneous value, uph
T () is the intrinsic ac phase voltage instantaneous value of circuit；
It can be seen that momentary load voltage is equal to instantaneous phase voltages uph(t) and DVR instantaneous output voltages uDVRThe algebraical sum of (t), from
And its industrial frequency AC phasor relation is
In formula：It is sensitive loads two ends power frequency ac voltage phasor,It is DVR output industrial frequency AC compensation electricity
Pressure phasor,It is the intrinsic industrial frequency AC phase voltage phasor of circuit；Meet dynamic voltage compensator (DVR) operation characteristic.
Embodiment：
As shown in table 1, it is that the DVR device performance requirements of certain type are as follows：
According to the transformerless type single-phase dynamic voltage compensator technical scheme based on HVDC Modulation that this patent is proposed, if
Meter DVR circuits and control system, to meet above-mentioned requirements.
According to performance requirement, the DVR needs to have at least 3 compensation abilitys of cycle under voltage supply interrupt condition, examines
Consider certain nargin, require that it has the full voltage amplitude compensation ability of at least 0.1s in design.According to rated power, can be in the hope of
It is required compensation energy be
Ec=Pn·Tmax=6kW × 0.1s=600J
In formula：EcMaximum single compensation energy, P for needed for DVR systemnIt is the specified compensation power of DVR, TmaxFor DVR is maximum
Single compensates the time；
To ensure circuit ideal performance, it is assumed that the maximum voltage gain of Boost type HVDC Modulation AC-AC converters is km=
2, inverter SPWM maximum modulation M=0.95, the then minimum direct-current working volts (C of storage capacitor1And C2Series connection total voltage) meet
Can ask
Direct current initial voltage is during charging complete
If capacitor's capacity is C1=C2=C, then energy storage link total capacitance be
Can determine storage capacitor value according to foregoing result of calculation, it is as follows
In formula：Udc2It is DC energy storage electric capacity total voltage minimum (correspondence single compensation finish time), U in compensation processm
It is gained DC pulse moving voltage maximum, U after diode rectificationpnIt is phase voltage rated value (virtual value), Udc1For in compensation process
DC energy storage electric capacity total voltage peak (correspondence charging complete post-compensation start time), UC1It is DC energy storage electric capacity C1Voltage,
UC2It is DC energy storage electric capacity C2Voltage, CstIt is the equivalent storage capacitor value of DC series, C is single DC energy storage capacitor's capacity；Examine
Consider circuit efficiency and allowance, storage capacitor C1And C2Capacitance is taken as 10mF.Other specification is adjusted according to circuit operation principle, this
Place repeats no more.
Simulation result
According to above-mentioned design, emulation test system, main circuit parameter are built under MATLAB-SIMULINK environment
It is as follows：C1=C2=8.6mF, L1=L2=2mH, C3=C4=500uF, Lin=1mH, Rin=10 ' Ω.
The voltage dip failure that amplitude is 30%, 60%, 100%, duration are introduced in the case where system is normally run respectively
It is 3 frequency cycles (60ms), the compensation effect of type DVR circuits is checked with this, shown in simulation result as Fig. 6-8, wherein Vs
Represent line voltage distribution, VoRepresent that, by the load voltage after type DVR compensation, all kinds of quality of power supply events betide simulation time
T=1.00s, continues the 60ms times.Compensation effect is good as seen from the figure, and load voltage level is fully returned to rating number.
Specific embodiment of the invention is described above.It is to be appreciated that the invention is not limited in above-mentioned
Particular implementation, those skilled in the art can within the scope of the claims make a variety of changes or change, this not shadow
Sound substance of the invention.In the case where not conflicting, feature in embodiments herein and embodiment can any phase
Mutually combination.
Claims (7)
1. a kind of transformerless type single-phase dynamic voltage compensator based on HVDC Modulation, it is characterised in that including：Charging mould
Block, energy-storage module, inversion module and AC-AC conversion modules；Wherein：
The charging module, for realizing charging operations of the power network to single-phase dynamic voltage compensator；
The energy-storage module, for that can store power network is charged to single-phase dynamic voltage compensator；
The inversion module, for being industrial-frequency alternating current by the DC conversion stored by energy-storage module；
The AC-AC conversion modules, the industrial-frequency alternating current for inversion module to be converted is converted into the alternating current matched with power network
Post-compensation gives power network loop.
2. the transformerless type single-phase dynamic voltage compensator based on HVDC Modulation according to claim 1, its feature exists
In the charging module includes：Charging contactor B1, charging inductance Lin, charging resistor Rin, commutation diode D1And rectification two
Pole pipe D2, the charging contactor B1One end be connected to node N0, the charging contactor B1The other end sequentially pass through charging
Inductance Lin, charging resistor RinAfterwards respectively with commutation diode D1Positive pole, commutation diode D2Negative pole be connected；The rectification two
Pole pipe D1Negative pole be connected to node N4, the commutation diode D2Positive pole be connected to node N5；Its interior joint N0, node N1Even
It is connected to the two ends of single-phase alternating current.
3. the transformerless type single-phase dynamic voltage compensator based on HVDC Modulation according to claim 1, its feature exists
In the energy-storage module includes：Capacitor C1With capacitor C2, the capacitor C1Two ends be respectively connecting to node N4And section
Point N1；The capacitor C2Two ends be respectively connecting to node N1With node N5；Wherein capacitor C1With capacitor C2Capacitance
Rated capacity and offset according to single-phase dynamic voltage compensator are determined.
4. the transformerless type single-phase dynamic voltage compensator based on HVDC Modulation according to claim 1, its feature exists
In the inversion module includes：Switching tube S1, switching tube S2, filter inductance L1And filter capacitor C3；Switching tube S1Colelctor electrode
It is connected to node N4, switching tube S2Emitter stage be connected to node N5, the filter inductance L1One end difference connecting valve pipe S1
Emitter stage and switching tube S2Colelctor electrode, filter inductance L1The other end pass through filter capacitor C3It is connected to node N1。
5. the transformerless type single-phase dynamic voltage compensator based on HVDC Modulation according to claim 1, its feature exists
In the AC-AC conversion modules include：Energy storage inductor L2, coupled capacitor C4, by-pass switch unit and two two-way switch controls
Unit processed；Wherein：The by-pass switch unit includes：The positive pole difference of IGCT THY1 and IGCT THY2, IGCT THY1
It is connected to node N1With the negative pole of IGCT THY2, the negative pole of IGCT THY1 is respectively connecting to node N3With IGCT THY2's
Positive pole；
Two-way switch control unit includes：Four diodes, switching tube S3Or switching tube S4, the S of switching tube3Or switching tube S4Collection
Electrode connects the negative pole of first diode and second diode, the S of switching tube respectively3Or switching tube S4Emitter stage difference
Connect the positive pole of the 3rd diode and the 4th diode, first positive pole of diode and the 3rd negative pole phase of diode
Connect and constitute one end of two-way switch control unit, second positive pole of diode is connected and structure with the negative pole of the 4th diode
The other end to switch control unit in pairs；One end of one of two-way switch control unit is connected to node N1, and this pair
Energy storage inductor L is connected to the other end of switch control unit2One end；One end connection of another two-way switch control unit
To node N3, and the other end of the two-way switch control unit is connected to energy storage inductor L2One end；Energy storage inductor L2The other end
It is connected to node N2, the coupled capacitor C4Two ends difference connecting node N1With node N3。
6. the transformerless type single-phase dynamic voltage compensator based on HVDC Modulation according to claim 4 or 5, its feature
It is, switching tube S1, switching tube S2, switching tube S3, switching tube S4Using full-controlled switch device.
7. the transformerless type single-phase dynamic voltage compensator based on HVDC Modulation according to claim 5, its feature exists
In AC-AC conversion modules are Boost type HVDC Modulation AC-AC converter circuits, for being same as realizing that DVR exports AC compensation
The flexible gain-adjusted of voltage couples injection with transless.
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