CN109412166A - Dynamic voltage recovery system based on double-bus crossfeed - Google Patents
Dynamic voltage recovery system based on double-bus crossfeed Download PDFInfo
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- CN109412166A CN109412166A CN201811344959.1A CN201811344959A CN109412166A CN 109412166 A CN109412166 A CN 109412166A CN 201811344959 A CN201811344959 A CN 201811344959A CN 109412166 A CN109412166 A CN 109412166A
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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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- 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
- H02J3/007—Arrangements for selectively connecting the load or loads to one or several among a plurality of power lines or power sources
- H02J3/0073—Arrangements for selectively connecting the load or loads to one or several among a plurality of power lines or power sources for providing alternative feeding paths between load and source when the main path fails, e.g. transformers, busbars
Abstract
The invention discloses a kind of dynamic voltage recovery system based on double-bus crossfeed, temporarily drop compensation is difficult when solving the problems, such as the more sensitive loads of load-side while voltage dip failure occurs.The present invention is powered using super capacitor energy-storage with battery group on demand using 27 level inverse conversion main circuit topological structures of full-bridge direct current booster circuit and cascade, direct current component, reduces bulk power grid investment.Voltage recovery device judges voltage dip and voltage interruption by detecting voltage dip amplitude size, and determining which kind of system is connected to the grid carries out voltage compensation.Double-bus crossfeed mode is based on when carrying out voltage interruption compensation, by the isolated island and the switching for the mode that is incorporated into the power networks that control compensation device, with microgrid work in isolated island mode, from isolated island to 3 kinds of grid-connected switchover operation mode, the mode that is incorporated into the power networks operational modes, realize two sections of bus crossfeeds, it is ensured that sensitive load power supply reliability in microgrid.Effective compensation voltage dip of the present invention improves power quality.
Description
Technical field
The present invention relates to a kind of dynamic voltage recovery systems based on double-bus crossfeed, belong to transient power quality and disturb
The analysis of dynamic signal and Treatment process field.
Background technique
For a long time, for the concern of power quality mostly in grid side, main monitoring index has voltage, frequency for power supply enterprise
Deng, but in the qualification power quality provided by power supply enterprise, sometimes but because of voltage dip caused by system disturbance etc.
Factor is not able to satisfy the requirement of some special enterprises, is generally concentrated at the user for possessing import equipment or precision instrument and producer.
And country does not put into effect voltage dip specific standard and requirement at present, so power supply enterprise uses the inside of special user
Electricity demanding research is less, these special enterprises if it is intended to guarantee instrument, machinery equipment normal operation, often want oneself to purchase
Pressure stabilizing device or voltage recovery device maintain, but the effect of the control of the voltage of monomer or recovery device is often not to the utmost such as people
Meaning, can not system this kind of user of solution predicament and problem, this just needs to study highly efficient and intelligence, and easily technology is come
It solves the above problems.
Since the eighties in last century, power quality problem has become the hot spot that everybody pays close attention to jointly each other and asks
Topic.Power quality problem is defined as: " any power quality problem show as voltage, electric current, frequency deviation, lead to electric power
The damage of user equipment or abnormal work."
In power quality problem, voltage problem is an important content.Voltage problem mainly include the rising sharply of voltage,
Fall, flickering, notch, a variety of phenomenons such as harmonic wave and interruption.Wherein, the falling in short-term of voltage (temporarily drop) or interrupt is commonly referred to as
" shaking electricity ".According to the statistical analysis to voltage failure, in all destructive voltage failures, the number of electric fault appearance is shaken most
It is more, up to 80% or so, caused by lose it is also maximum.Currently, solving the method for voltage dip and disruption mainly in user
At the sensitive equipment power import of side, targetedly install dynamic electric voltage recovery device (Dynamic Voltage Restore,
DVR), the power electronic equipments such as PQC, UPS carry out transient compensation Voltage Drop value, guarantee the normal operation of user.It is the most frequently used at present
Improvement electrical energy power quality disturbance effective ways be using dynamic electric voltage recovery device (Dynamic Voltage Restore,
DVR).It is a kind of voltage source type electric power electronic compensation device, is serially connected between power supply and important load, has good dynamic
Performance.When short time voltage disturbance occurs, voltage at failure can be restored to normally by DVR within the very short time (several milliseconds)
Value.For other several power quality controlling devices, it is most economical, most effective hand that DVR, which has higher flexibility,
Section, application prospect are boundless.But as sensitive equipment increases in user, more equipment compensate that there is more compensator phases simultaneously
The problem of mutually cooperating, influencing each other.The voltage dip resolution of dispersion compensation is still used at this time, and total investment and loss will
Substantial increase, returns of investment reduce, and electricity harm improves also limited.And it solves to supply based on power electronic equipment both at home and abroad now
The research of piezoelectric voltage quality problems is at present mainly using single busbar power supply system as research object.It is existing actual industrial is not comprehensively considered
The case where field is mostly double-bus power supply, the compensation capacity of device and compensation time are limited.When power grid is fully powered-off, tradition
DVR not can solve the problem of user's continuous production is interrupted.Very huge economic loss is not only caused in this way, it sometimes can also be to member
The personal safety of work damages.It can be seen that solving the problems, such as that shake electricity not only can may be used also to avoid the economic loss of manufacturing enterprise
To avoid safety accident resulting from, it is of great significance.
Therefore, it is concentrated using supply side and solves the problems, such as to shake the electric power quality that can improve all users to the maximum extent.
Present invention seek to address that in power consumer the voltage dip of special responsible consumer power quality problem.It is general for responsible consumer
For the mode of double sections of bussed supplies, and the actual conditions of the probability very little of Voltage Drop occur simultaneously for double sections of buses, rely on advanced
Power electronic technique study the anti-shake power technology from source side Concetrated control for special user, electric fault will be shaken to user
Disturbance be reduced to minimum, to avoid electricity unit continuous production process because shake electricity due to interrupt, cause heavy economic losses very
The problem of to safety accident, to improve power supply quality and successfully manage electricity consumption manufacturing enterprise because voltage dip and disruption are brought
Various economy and safety problem.Therefore, under double-bus electric power thus supplied, the dynamic of high-power centralized compensation is realized in source side
Voltage recovery technology research has very important significance.
Summary of the invention
The purpose of the present invention is to provide a kind of dynamic voltage recovery systems based on double-bus crossfeed, solve tradition
The compensation device based on power electronics not from the angle of entire power supply system, device is limited by cost, power,
The problem of actual demand of the more sensitive loads of load-side can not be met very well, the present invention are real in the way of double-bus crossfeed
Existing grid side voltage dip and the dynamic voltage recovery system for interrupting centralized compensation, it is double female for making full use of industry spot generally
Line power supply, and the actual conditions of the probability very little of Voltage Drop occur simultaneously for double-bus, realize grid side to voltage dip in
Disconnected centralized compensation.
The purpose of the present invention is achieved by the following technical programs:
A kind of dynamic voltage recovery system based on double-bus crossfeed, voltage recovery device is intersected using double-bus to be supplied
Electric mode realizes that the centralized compensation of voltage dip and interruption on bus, every section of bus configure a set of dynamic electric voltage in grid side
Recovery system, every set dynamic voltage recovery system include: inverter INV1, inverter INV2, INV1 output filter, INV2
Export filter, the series coupled transformer T3 of inverter INV1, super capacitor V1, battery group V2, charge controller 1,
Dynamic electric voltage recovery device control system 2, mother static transfer switch Q3；The output voltage of the inverter INV1 is defeated through INV1
Filter is exported again to the primary side of series coupled transformer T3, the secondary side series connection access electricity of series coupled transformer T3 out
Net realizes DVR function to compensate small size voltage dip, inverter INV2 output voltage after INV2 exports filter simultaneously
Couple the function that online UPS is realized into power grid, when power failure occurs for power grid, inverter INV2 plays support voltage and frequency
Effect；Inverter INV1 be low capacity inversion unit, inverter INV2 be high capacity inversion unit, the super capacitor V1,
Battery group V2 is connected with charge controller 1 respectively, and the charge controller 1 is connected with inverter INV1, inverter INV2, institute
It states dynamic electric voltage recovery device control system 2 to be connected with inverter INV1, inverter INV2 respectively, the mother static conversion is opened
It closes Q3 I sections of buses are connected with II sections of buses.
The aforementioned dynamic voltage recovery system based on double-bus crossfeed further includes reverse-filling high-speed switch SCR, described
Reverse-filling high-speed switch SCR is connected between series coupled transformer T3 and main transformer.
The aforementioned dynamic voltage recovery system based on double-bus crossfeed, the inverter INV1, inverter INV2 are equal
The booster type Mixed cascading multi-level inverse conversion list combined using full bridge boost converter with 27 electrical level inverter of 3H bridge cascade connection type
Member is used as main circuit topology unit, and DC terminal uses full-bridge boost structure, carries out in proportion to battery and super capacitor
Boosting output realizes that the DC voltage input ratio of 3H bridge meets U1:U2:U3The input requirements of=1:3:9, to pass through pulsewidth tune
System control inverter exports the alternating voltage of 27 level, provides stable offset voltage for voltage dip and the recovery interrupted.
The control method of the aforementioned dynamic voltage recovery system based on double-bus crossfeed, by the voltage on bus
Feature vector is monitored, and judges that falling for busbar voltage belongs to voltage dip or voltage interruption, according to Voltage Drop form
It selects suitable voltage recovery device, realizes in grid side to the voltage dip of this section of bus and the centralized compensation of interruption.
The control method of the aforementioned dynamic voltage recovery system based on double-bus crossfeed, comprising the following steps:
Step 1, it monitors busbar voltage on-line: when normal operation, bus voltage signal, voltage being monitored on-line by control system
Temporarily drop compensation system do not devote oneself to work, and voltage interruption recovery system can according to the voltage signal of the real-time detection of control system,
And one constant amplitude of output is tracked with the voltage of phase, be incorporated into the power networks with I sections of power grids is load supplying jointly, the warm back-up as load
Power supply；
Step 2, voltage recovery device operating mode select: when Voltage Drop occurs, by voltage dip amplitude into
Row judgement, if voltage dip amplitude less than 30%, is devoted oneself to work by voltage dip compensation system and carries out voltage dip compensation；
When grid voltage sags > 30% or complete power loss, voltage interruption recovery system, which is devoted oneself to work, realizes that voltage interruption is restored；
Step 3, voltage recovery device is devoted oneself to work
The work of 3.1 voltage dip compensation systems: when voltage dip occurs, control system controls rapidly low capacity inversion unit
INV1 exports offset voltage, the temporary drop of power grid median generatrix voltage is compensated by grid-connected transformer T3, it is ensured that busbar voltage remains unchanged
For the sine voltage signal of standard；
The work of 3.2 voltage interruption recovery systems: it when voltage interruption occurs, turns off reverse-filling SCR and quickly disconnects, prevent
Electric current flows backward, and INV1 does not work, and control system control INV2 is in " isolated island " operating status, loads independently-powered by INV2；
And then, control system starts grid connection presynchronization control module, adjusts the output voltage of INV2, makes itself and right side II sections of power grid electricity
Pressure is consistent, and when the amplitude of INV2 output voltage, frequency, phase and II section power grid are in allowable range of error, it is quiet to close mother
State change-over switch Q3, INV2 and II sections of power grid is load supplying jointly at this time, and INV2 is transferred to " grid-connected " by " isolated island " operating status
Operating status；When I sections of power grids restore normal power supply by failure or inspecting state, control system controls Q3 and disconnects, load by
INV2 is independently-powered, and control system is again started up grid connection presynchronization control module, adjusts its INV2 output voltage and I sections of power grids one
It causes, then closes reverse-filling SCR, system restores normal power supply；
Step 4, repeatedly, the fast and effective recovery for realizing grid side voltage dip and interruption, improves sensitive load
Power supply reliability.
Compared with prior art, the beneficial effects of the present invention are: solving the more sensitive loads of load-side, that voltage occurs is temporary simultaneously
Temporary drop when dropping failure compensates difficult problem.As sensitive equipment increases in user, more equipment compensate simultaneously mends more there is
The problem of device cooperates, influences each other is repaid, if still compensating improvement side using the voltage dip of load-side dispersion compensation at this time
By substantial increase, the improvement of voltage dip harm is also limited for case, total investment and loss.The present invention is by dynamic electric voltage recovery device
(DVR) it is combined with uninterruptible power supply (UPS), using 27 level inverse conversion main circuit topology knots of full-bridge direct current booster circuit and cascade
Frame based on structure, direct current component is powered using super capacitor energy-storage with battery group on demand, without passing through external electrical
Net power supply, is further reduced the investment of bulk power grid.Voltage recovery device judges that voltage is temporary by detecting voltage dip amplitude size
Drop and voltage interruption, so that it is determined which kind of system, which is connected to the grid, carries out voltage compensation.When carrying out voltage interruption compensation, it is based on
Double-bus crossfeed mode is existed by controlling isolated island and the switching for the mode that is incorporated into the power networks of compensation device with microgrid work
Isolated island mode, from isolated island to 3 kinds of grid-connected switchover operation mode, the mode that is incorporated into the power networks operational modes, realize the intersection of two sections of buses
Power supply, it is ensured that the power supply reliability of sensitive load in microgrid.The voltage dip of the more sensitive loads of load-side is realized in grid side
With interrupt Concetrated control dynamic voltage recovery system can not only effective compensation voltage dip, improve grid power quality, and
No-harass switch can will be rapidly loaded to other one section in the case where power grid power failure, through the switching of operational mode
Bus realizes the seamless switching power supply between double-bus.Use supply side centralized compensation voltage dip and interruption can be with maximum limit
Degree ground improves the power quality of load-side all sensitive loads, is further reduced the investment and voltage compensating device of bulk power grid
Quantity has saved cost, and the long-time that voltage dip and interruption may be implemented compensates, and further improves sensitive load
Power supply reliability.
Detailed description of the invention
Fig. 1 is that double-bus crossfeed realizes grid side voltage dip and interrupts the dynamic voltage recovery system of centralized compensation
Structure chart；
Fig. 2 is that grid side realizes voltage dip and interrupts compensation device working principle diagram；
Fig. 3 is INV2 operational mode switching block diagram when busbar voltage is interrupted；
Fig. 4 is high-power dynamic electric voltage recovery device main circuit topological structure sketch；
Fig. 5 is cascade 27 electrical level inverter output AC voltage waveform of 3H bridge.
Specific embodiment
Dynamic voltage recovery system based on double-bus crossfeed of the invention, voltage recovery device are handed over using double-bus
Power supply mode is pitched, realizes that the centralized compensation of voltage dip and interruption on bus, every section of bus configure a set of dynamic in grid side
Voltage recovery device, every set dynamic voltage recovery system include: inverter INV1, inverter INV2, INV1 output filter,
INV2 exports filter, the series coupled transformer T3 of inverter INV1, super capacitor V1, battery group V2, charge control
Device 1, dynamic electric voltage recovery device control system 2, mother static transfer switch Q3；The output voltage of the inverter INV1 passes through
INV1 output filter is exported again to the primary side of series coupled transformer T3, and the secondary side of series coupled transformer T3 is connected
Power grid is accessed, realizes DVR function to compensate small size voltage dip, inverter INV2 output voltage exports filtering dress through INV2
The function that access power grid in parallel realizes online UPS is postponed, when power failure occurs for power grid, inverter INV2 plays support voltage
With the effect of frequency；Inverter INV1 is low capacity inversion unit, and inverter INV2 is high capacity inversion unit, the super electricity
Hold V1, battery group V2 is connected with charge controller 1 respectively, the charge controller 1 and inverter INV1, inverter INV2 phase
Even, the dynamic electric voltage recovery device control system 2 is connected with inverter INV1, inverter INV2 respectively, and the mother is static
I sections of buses are connected by change-over switch Q3 with II sections of buses.
It include two inversion units in every set dynamic voltage recovery system, INV1 output voltage series connection access power grid is used
Tradition DVR function is realized to compensate small size voltage dip (less than 30%), and INV2 realizes the function of similar online UPS, in parallel
Power grid is accessed, when power failure occurs for power grid, INV2 can play the role of supporting voltage and frequency.Therefore, compared to biography
The voltage dip of system DVR general indemnity 60%.The double-bus crossfeed dynamic voltage recovery system is installed on grid side, leads to
It crosses and the voltage characteristic vector on bus is monitored, judge that falling for busbar voltage belongs to voltage dip or voltage interruption,
According to the suitable voltage recovery device of Voltage Drop formal character, the voltage dip in grid side to this section of bus and interruption are realized
Centralized compensation.The voltage recovery device uses double-bus crossfeed mode, with double inversion units and energy-storage units and simultaneously
Frame based on net transformer.In double inversion units, low capacity inversion unit is used as dynamic electric voltage recovery device (DVR), to
It compensates small size voltage dip (less than 30%), high capacity inversion unit is used as uninterruptible power supply (UPS), is powered on for bus
Voltage support when pressure is interrupted.The voltage recovery device passes through filter unit using DVR unit when carrying out voltage dip compensation
Offset voltage is injected into power grid with series transformer, realizes the quick compensation of voltage dip.Voltage interruption then uses UPS when restoring
Compensation device is quickly cut by controlling the switching of operational mode by the way that the grid-connected and island mode of high capacity inversion unit is seamless
It changes, realizes that UPS individually powers and the switching of double-bus crossfeed, to complete the fast quick-recovery of interrupt voltage on bus.
The present invention designs the dynamic electric voltage recovery device main circuit topology based on Mixed cascading multi-level inverse conversion structure, and analysis should
The topological structure and working principle of the more level of Mixed cascading.Since main object is DVR and UPS, while in order to simplify tradition
Cascade H bridge type multi-level inverse conversion unit labyrinth, realize that level as much as possible exports using less power device,
The present invention designs the inversion unit in DVR main circuit using a kind of more level cascaded H-bridges multi-level inverse conversion technologies of modified, and
Full bridge boost converter is added in the direct-flow input end of inverter main circuit, improves front end direct current input voltage, further increases inverse
Become the output capacity of unit.Wherein main circuit topological structure is divided into two modules, full-bridge boost circuit module and 27 level inverse conversions
Circuit module carries out the DC power signal of battery group or energy storage super capacitor at inversion in full-bridge boost circuit
The ac supply signal of output is filtered by step-up transformer and EMI, is hindered the interference signal of high frequency for reason
Hinder, filtered signal is rectified, and final output is by the DC supply input as 27 electrical level inverters.In 27 electricity of modified
In flat H bridge inverter unit, inversion analysis is carried out to the DC supply input of E, 3E, 9E respectively.
The H bridge that DC side is 9E is analyzed, the direct current that power switch S1, S1*, S2, S2* is born in the unit is maximum
Voltage is 9E, and the switch of two groups of independence clearances is worked respectively in complementary state, can be combined into 4 kinds of working conditions in this way, open
Off status is as follows:
As S1=S2*=1 and S1*=S2=0, U1=9E；
As S1=S2=1 and S1*=S2*=0, U1=0；
As S1*=S2*=1 and S1=S2=0, U1=0；
As S1*=S2=1 and S1=S2*=0, U1=-9E；
The H bridge that DC side is 3E is analyzed, the direct current that power switch S3, S3*, S4, S4* is born in the unit is maximum
Voltage is 3E, and the switch of two groups of independence clearances is worked respectively in complementary state, can be combined into 4 kinds of working conditions in this way, open
Off status is as follows:
1) as S3=S4*=1 and S3*=S4=0, U2=3E；
2) as S3=S4=1 and S3*=S4*=0, U2=0；
3) as S3*=S4*=1 and S3=S4=0, U2=0；
4) as S3*=S4=1 and S3=S4*=0, U2=-3E；
The H bridge that DC side is E is analyzed, the direct current that power switch S5, S5*, S6, S6* is born in the unit is maximum
Voltage is E, and the switch of two groups of independence clearances is worked respectively in complementary state, in this way to be combined into 4 kinds of working conditions, switchs shape
State is as follows:
1) as S5=S6*=1 and S5*=S6=0, U3=E；
2) as S5=S6=1 and S5*=S6*=0, U3=0；
3) as S5*=S6*=1 and S5=S6=0, U3=0；
4) as S5*=S6=1 and S5=S6*=0, U3=-E；
It can be seen that control DC side input voltage ratio is U by cascading 3H bridge1:U2:U3=1:3:9, and using most
Nearly level approaches the modulation that modulation algorithm realizes large capacity electronic switching device, to complete the superposition of 3H bridge output level, most
The output signal of 27 level alternating voltages is realized eventually.
Therefore, the level that three H-bridge units cascade is as shown in the table:
127 level cascaded H-bridges circuit power pipe switch list of table
| Output level | H bridge (9E) | H bridge (3E) | H bridge (E) |
| 13E | 9E | 3E | E |
| 12E | 9E | 3E | 0 |
| 11E | 9E | 3E | -E |
| 10E | 9E | 0 | E |
| 9E | 9E | 0 | 0 |
| 8E | 9E | 0 | -E |
| 7E | 9E | -3E | E |
| 6E | 9E | -3E | 0 |
| 5E | 9E | -3E | -E |
| 4E | 0 | 3E | E |
| 3E | 0 | 3E | 0 |
| 2E | 0 | 3E | -E |
| E | 0 | 0 | E |
| 0 | 0 | 0 | 0 |
| Export negative level | Correspondence takes negative value | Correspondence takes negative value | Correspondence takes negative value |
The present invention will be further explained below with reference to the attached drawings and specific examples.
Shown in Figure 1, double-bus crossfeed mode realizes that the dynamic electric voltage of grid side voltage dip centralized compensation is extensive
Complex system structure chart.Fig. 1 is dynamic voltage recovery system main circuit structure figure.Every section of bus configures a set of dynamic electric voltage and restores
System.
As shown in Figure 1, every set dynamic voltage recovery system includes two inversion units, the series connection access of INV1 output voltage
Power grid realizes tradition DVR function to compensate small size voltage dip (less than 30%), and INV2 realizes the function of similar online UPS
Can, parallel connection access power grid, when power failure occurs for power grid, INV2 can play the role of supporting voltage and frequency.
Shown in Figure 2, grid side realizes voltage dip and interrupts compensation device working principle diagram.Wherein INV1 and its defeated
Filter and series coupled transformer TR1 realize tradition DVR function out, and INV2 and its filter realize similar uninterruptible power supply
Function.
When normal operation, INV1 does not work, at this time INV2 real-time detection busbar voltage, and tracks one same phase of constant amplitude of output
Voltage, be incorporated into the power networks jointly the warm back-up power supply for load supplying, as load with I sections of power grids.When voltage dip occurs,
Voltage dip amplitude is judged, if voltage dip amplitude exports offset voltage less than 30%, by INV1, passes through series connection
Transformer compensates the temporary drop of power grid median generatrix voltage, it is ensured that busbar voltage is still the sine voltage of standard.When power grid has
When larger Voltage Drop or complete power loss (> 30%), reverse-filling SCR is quickly disconnected at this time, prevents electric current from flowing backward, and INV1 is not
Work, control system control INV2 are in " isolated island " operating status, load independently-powered by INV2.And then, control system opens
Dynamic grid connection presynchronization control module, adjusts the output voltage of INV2, keeps it consistent with right side II sections of network voltage, exports to INV2
When amplitude, frequency, phase and II section power grid of voltage are in allowable range of error, bus connection switch Q3 is closed, at this time INV2 and II
Section power grid is load supplying jointly, and INV2 is transferred to " grid-connected " operating status by " isolated island " operating status.When I sections of power grids by failure or
When inspecting state restores normal power supply, control system controls Q3 and disconnects, and load is independently-powered by INV2, and control system is again started up
Grid connection presynchronization control module, it is consistent with I sections of power grids to adjust its INV2 output voltage, then closes reverse-filling SCR, and system is restored
Normal power supply.
Shown in Figure 3, INV2 operational mode switches block diagram when busbar voltage is interrupted.As shown in Figure 4, INV2 inversion unit
Work island mode, grid-connect mode, isolated island to grid-connect mode switch, it is grid-connected to island mode switch four kinds of operating modes.Its
The switching of middle isolated island to grid-connect mode is particularly important, and the voltage interruption on I sections of buses compensates voltage transformation unit INV2, and it is right in real time to need
II section of busbar voltage is monitored on-line, once voltage interruption occurs for I sections of buses, disconnects reverse-filling switch SCR, INV2 becomes at this time
At isolated operation mode, using sagging control strategy, INV2 output and II section of consistent voltage signal of busbar voltage, and control mother
Join switch Q3 to close a floodgate, realize the quasi- simultaneous interconnecting of inversion unit, to complete the seamless switching of two kinds of powering modes.As I sections of mothers
When line voltage is restored, mode handover procedure is consistent with the above, to be finally completed the recovery of busbar voltage interruption, improves power grid
The power supply reliability of side voltage.
It is shown in Figure 4, high-power dynamic voltage recovery system main circuit topological structure sketch.Big function shown in Fig. 4
Rate main circuit topological structure is divided into two modules, full-bridge boost circuit module and 27 level inverter circuit modules, in full-bridge boost
In circuit, the DC power signal of battery group or energy storage super capacitor is subjected to inversion processing, the alternating current output it
Source signal is filtered by step-up transformer and EMI, is hindered the interference signal of high frequency, filtered signal passes through
Full-bridge boost changes the phase, uses three full bridge boost converter final output voltage ratios of pulse width modulation controlled for U1:U2:U3=1:
3:9.In 27 level H-bridge inversion unit of modified, we carry out inversion analysis to the DC supply input of E, 3E, 9E respectively.
The H bridge that DC side is 9E is analyzed, the direct current that power switch S1, S1*, S2, S2* is born in the unit is maximum
Voltage is 9E, and the switch of two groups of independence clearances is worked respectively in complementary state, can be combined into 4 kinds of working conditions in this way, open
Off status is as follows:
1) as S1=S2*=1 and S1*=S2=0, U1=9E；
2) as S1=S2=1 and S1*=S2*=0, U1=0；
3) as S1*=S2*=1 and S1=S2=0, U1=0；
4) as S1*=S2=1 and S1=S2*=0, U1=-9E；
The H bridge that DC side is 3E is analyzed, the direct current that power switch S3, S3*, S4, S4* is born in the unit is maximum
Voltage is 3E, and the switch of two groups of independence clearances is worked respectively in complementary state, can be combined into 4 kinds of working conditions in this way, open
Off status is as follows:
1) as S3=S4*=1 and S3*=S4=0, U2=3E；
2) as S3=S4=1 and S3*=S4*=0, U2=0；
3) as S3*=S4*=1 and S3=S4=0, U2=0；
4) as S3*=S4=1 and S3=S4*=0, U2=-3E；
The H bridge that DC side is E is analyzed, the direct current that power switch S5, S5*, S6, S6* is born in the unit is maximum
Voltage is E, and the switch of two groups of independence clearances is worked respectively in complementary state, in this way to be combined into 4 kinds of working conditions, switchs shape
State is as follows:
1) as S5=S6*=1 and S5*=S6=0, U3=E；
2) as S5=S6=1 and S5*=S6*=0, U3=0；
3) as S5*=S6*=1 and S5=S6=0, U3=0；
4) as S5*=S6=1 and S5=S6*=0, U3=-E.
It can be seen that modulation strategy is approached by cascading 3H bridge inverter circuit, and using nearest level, it may finally be defeated
Out 0, ± E,± 2E, ± 3E,±4E,±5E,±6E,±7E,±8E,± 9E, ± 10E,±11E,±12E,27 level of ± 13E
Ac voltage signal.
It is shown in Figure 5, cascade 27 electrical level inverter output AC voltage waveform diagram of 3H bridge.Main circuit according to Fig.4,
Topological structure is emulated by Matlab/Simulink, available output offset voltage waveform diagram as shown in Figure 5.Passing through will
The cascade of 3H bridge, control DC side input voltage ratio are U1:U2:U3=1:3:9, and modulation algorithm realization is approached using nearest level
The modulation of large capacity electronic switching device, so that the superposition of 3H bridge output level is completed, final output 27 level as shown in the figure
Ac voltage signal waveform.
In addition to the implementation, the present invention can also have other embodiments, all to use equivalent substitution or equivalent transformation shape
At technical solution, be all fallen within the protection domain of application claims.
Claims (5)
1. a kind of dynamic voltage recovery system based on double-bus crossfeed, voltage recovery device uses double-bus crossfeed
Mode realizes the centralized compensation of voltage dip and interruption on bus in grid side, and it is extensive that every section of bus configures a set of dynamic electric voltage
Complex system, it is characterised in that: every set dynamic voltage recovery system includes: inverter INV1, inverter INV2, INV1 output filtering
Device, INV2 output filter, the series coupled transformer T3 of inverter INV1, super capacitor V1, battery group V2, charging
Controller 1, dynamic electric voltage recovery device control system 2, mother static transfer switch Q3；The output voltage of the inverter INV1
It is exported again through INV1 output filter to the primary side of series coupled transformer T3, the secondary side string of series coupled transformer T3
Couple into power grid, realizes DVR function to compensate small size voltage dip, inverter INV2 output voltage is exported through INV2 and filtered
The function in parallel of accessing power grid and realize online UPS after device, when power failure occurs for power grid, inverter INV2 plays support electricity
The effect of pressure and frequency；Inverter INV1 is low capacity inversion unit, and inverter INV2 is high capacity inversion unit, described super
Capacitor V1, battery group V2 are connected with charge controller 1 respectively, the charge controller 1 and inverter INV1, inverter INV2
It is connected, the dynamic electric voltage recovery device control system 2 is connected with inverter INV1, inverter INV2 respectively, and the mother is quiet
I sections of buses are connected by state change-over switch Q3 with II sections of buses.
2. the dynamic voltage recovery system according to claim 1 based on double-bus crossfeed further includes that reverse-filling is fast
Fast switch SCR, the reverse-filling high-speed switch SCR are connected between series coupled transformer T3 and main transformer.
3. the dynamic voltage recovery system according to claim 1 based on double-bus crossfeed, the inverter INV1,
Inverter INV2 is all made of the booster type Mixed cascading that full bridge boost converter is combined with 27 electrical level inverter of 3H bridge cascade connection type
Multi-level inverse conversion unit is as main circuit topology unit, and DC terminal uses full-bridge boost structure, to battery and super capacitor
Boosting output in proportion is carried out, realizes that the DC voltage input ratio of 3H bridge meets U1:U2:U3The input requirements of=1:3:9, from
And by pulse width modulation controlled inverter export 27 level alternating voltage, for voltage dip with interruption recovery provide it is stable
Offset voltage.
4. the control method of the dynamic voltage recovery system according to claim 1 based on double-bus crossfeed, special
Sign is, by being monitored to the voltage characteristic vector on bus, judges that falling for busbar voltage belongs to voltage dip still
Voltage interruption is realized in grid side according to the suitable voltage recovery device of Voltage Drop formal character to the voltage of this section of bus
The centralized compensation for temporarily dropping and interrupting.
5. the control method of the dynamic voltage recovery system according to claim 1 based on double-bus crossfeed, special
Sign be the following steps are included:
Step 1, it monitors busbar voltage on-line: when normal operation, bus voltage signal, voltage dip being monitored on-line by control system
Compensation system is not devoted oneself to work, and voltage interruption recovery system can according to the voltage signal of the real-time detection of control system, and with
Track exports a constant amplitude with the voltage of phase, is incorporated into the power networks with I sections of power grids jointly for load supplying, the warm back-up as load is electric
Source；
Step 2, voltage recovery device operating mode selects: when Voltage Drop occurs, by sentencing to voltage dip amplitude
It is disconnected, if voltage dip amplitude less than 30%, is devoted oneself to work by voltage dip compensation system and carries out voltage dip compensation；Work as electricity
When net Voltage Drop > 30% or complete power loss, voltage interruption recovery system, which is devoted oneself to work, realizes that voltage interruption is restored；
Step 3, voltage recovery device is devoted oneself to work
The work of 3.1 voltage dip compensation systems: when voltage dip occurs, control system controls rapidly low capacity inversion unit INV1
Offset voltage is exported, the temporary drop of power grid median generatrix voltage is compensated by grid-connected transformer T3, it is ensured that busbar voltage is still mark
Quasi- sine voltage signal；
The work of 3.2 voltage interruption recovery systems: it when voltage interruption occurs, turns off reverse-filling SCR and quickly disconnects, prevent electric current
Flow backward, and INV1 does not work, control system control INV2 is in " isolated island " operating status, loads independently-powered by INV2；Immediately
, control system starts grid connection presynchronization control module, adjusts the output voltage of INV2, makes itself and right side II sections of network voltage one
It causes, when the amplitude of INV2 output voltage, frequency, phase and II section power grid are in allowable range of error, close mother static state and turn
Switch Q3 is changed, INV2 and II sections of power grid is load supplying jointly at this time, and INV2 is transferred to " grid-connected " operation by " isolated island " operating status
State；When I sections of power grids restore normal power supply by failure or inspecting state, control system controls Q3 and disconnects, and loads only by INV2
Vertical power supply, control system are again started up grid connection presynchronization control module, and it is consistent with I sections of power grids to adjust its INV2 output voltage, so
After close reverse-filling SCR, system restores normal power supply；
Step 4, repeatedly, the fast and effective recovery for realizing grid side voltage dip and interruption, improves the confession of sensitive load
Electric reliability.
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