CN108808698A - Distributed sub-synchronous oscillation restraining device based on energy storage and new energy transmission system - Google Patents
Distributed sub-synchronous oscillation restraining device based on energy storage and new energy transmission system Download PDFInfo
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- CN108808698A CN108808698A CN201810432179.6A CN201810432179A CN108808698A CN 108808698 A CN108808698 A CN 108808698A CN 201810432179 A CN201810432179 A CN 201810432179A CN 108808698 A CN108808698 A CN 108808698A
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- 230000010355 oscillation Effects 0.000 title claims abstract description 154
- 230000005540 biological transmission Effects 0.000 title claims abstract description 76
- 230000000452 restraining effect Effects 0.000 title claims abstract description 48
- 238000004146 energy storage Methods 0.000 title claims abstract description 47
- 230000005611 electricity Effects 0.000 claims abstract description 74
- 230000005684 electric field Effects 0.000 claims abstract description 42
- 230000000087 stabilizing effect Effects 0.000 claims abstract description 4
- 230000005764 inhibitory process Effects 0.000 claims description 23
- 238000004804 winding Methods 0.000 claims description 6
- 230000001629 suppression Effects 0.000 claims description 5
- 239000003990 capacitor Substances 0.000 claims description 4
- 230000008859 change Effects 0.000 claims description 2
- 230000003534 oscillatory effect Effects 0.000 claims description 2
- 230000002401 inhibitory effect Effects 0.000 abstract description 4
- 230000001360 synchronised effect Effects 0.000 description 5
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- WHXSMMKQMYFTQS-UHFFFAOYSA-N Lithium Chemical compound [Li] WHXSMMKQMYFTQS-UHFFFAOYSA-N 0.000 description 1
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Classifications
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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
- H02J3/24—Arrangements for preventing or reducing oscillations of power in networks
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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
- H02J3/28—Arrangements for balancing of the load in a network by storage of energy
- H02J3/32—Arrangements for balancing of the load in a network by storage of energy using batteries with converting means
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- H02J3/382—
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Abstract
The invention discloses a kind of distributed sub-synchronous oscillation restraining device and new energy transmission system based on energy storage, wherein sub-synchronous oscillation restraining device is mounted on the transmission line of electricity between new energy electric field and bus rod, including：Signal collecting device is connect with transmission line of electricity, for acquiring sub-synchronous oscillation signal on transmission line of electricity；Sub-synchronous oscillation inhibits equipment, for exporting sub-synchronous oscillation impedance signal according to sub-synchronous oscillation signal；Transformer is installed in series on transmission line of electricity, for injecting sub-synchronous oscillation impedance voltage into transmission line of electricity according to sub-synchronous oscillation impedance signal；Energy storage device inhibits the fluctuation of capacitance both end voltage in equipment for stabilizing sub-synchronous oscillation.Energy storage device provides active energy for capacitance, stabilizes the fluctuation at capacitance both ends.So as to improve the rejection ability of distributed sub-synchronous oscillation restraining device, increase the frequency range for inhibiting sub-synchronous oscillation.
Description
Technical field
The present invention relates to field of new energy technologies, and in particular to inhibits to a kind of distributed sub-synchronous oscillation based on energy storage
Device and new energy transmission system.
Background technology
Fast development based on generation of electricity by new energy, China have become the state that wind capacity integrated into grid is maximum and photovoltaic is with fastest developing speed
Family.However as the large-scale grid connection of the new energy such as wind-powered electricity generation, other than incident great economic benefit, electric system is also given
Safe and stable operation bring new problem.It is found that obviously in multiple wind power bases such as the northwests, North China, northeast in China
Sub-synchronous oscillation phenomenon.Sub-synchronous oscillation has become the major issue that the safe efficient operation of Chinese large-sized new energy faces.
Typical sub-synchronous oscillation restraining device is broadly divided into parallel connection type sub-synchronous oscillation restraining device and tandem type at present
Two class of sub-synchronous oscillation restraining device has obtained excellent effect in terms of inhibiting thermoelectricity sub-synchronous oscillation.
But due to the existing subsynchronous inhibition vibration suppression device of new energy, often concentrates and be fixed on mains side or defeated
In electric line, concentrated restraining is carried out to the sub-synchronous oscillation of all circuits, since the operation conditions of each new energy electric field exists
The case where larger difference, the distributed new grid-connected sub-synchronous oscillation brought, is complex, subsynchronous is shaken using existing
Swing suppression technology it is grid-connected to distributed new electric field after sub-synchronous oscillation inhibit, also need to consider on grid-connected circuit time
Synchronization inhibits the phenomenon that signal is distributed to each new energy electric field, due to the sub-synchronous oscillation of different new energy electric field generations
Amplitude and frequency are possible to different, after grid-connected, sub-synchronous oscillation complex, centralization are caused to inhibit to cause very
Multiple synchronized oscillation signal can not be suppressed, undesirable so as to cause inhibition.Also, due to the width of sub-synchronous oscillation voltage
It is worth larger, frequency of oscillation is relatively low so that larger fluctuation occurs for the voltage at capacitance both ends in reactive power compensation circuit, causes time
The output of synchronized oscillation restraining device generates fluctuation, influences the inhibition to sub-synchronous oscillation.
Invention content
The technical problem to be solved in the present invention is how to improve the inhibition of sub-synchronous oscillation.
According in a first aspect, an embodiment of the present invention provides a kind of, the distributed sub-synchronous oscillation based on energy storage inhibits dress
It sets, which is characterized in that distributed sub-synchronous oscillation restraining device is mounted on the power transmission line between new energy electric field and bus rod
On the road, distributed subsynchronous restraining device includes：Signal collecting device is connect with transmission line of electricity, for acquiring transmission line of electricity
Sub-synchronous oscillation signal；Sub-synchronous oscillation inhibits equipment, is connect with signal collecting device, for defeated according to sub-synchronous oscillation signal
Go out sub-synchronous oscillation impedance signal；Transformer connect with subsynchronous inhibition equipment, is installed in series on transmission line of electricity, is used for basis
Sub-synchronous oscillation impedance signal injects sub-synchronous oscillation impedance voltage into transmission line of electricity；Energy storage device presses down with sub-synchronous oscillation
Control equipment connects, the fluctuation for inhibiting the capacitance both end voltage of equipment for stabilizing sub-synchronous oscillation.
Optionally, signal collecting device includes：Signal gathering unit is connect with transmission line of electricity, for acquiring transmission line of electricity
In electric signal；Filter is connect with signal gathering unit, and sub-synchronous oscillation signal is obtained for being filtered to electric signal；
Phase compensation block is connect with filter, for carrying out phase compensation to sub-synchronous oscillation signal.
Optionally, sub-synchronous oscillation inhibition equipment includes：Transverter is connect with transmission line of electricity, inhibits transmission of electricity for exporting
The subsynchronous impedance signal of sub-synchronous oscillation in circuit；Control module is connect with signal collecting device and transverter respectively, is used
Subsynchronous impedance signal is exported in controlling transverter according to sub-synchronous oscillation signal.
Optionally, transverter includes：H bridge transverters.
Optionally, energy storage device is in parallel with the capacitor of H bridge transverters.
Optionally, H bridges transverter includes bridge-type H bridges transverter or semi-bridge type H bridge transverters.
Optionally, the first side winding series connection access transmission line of electricity of transformer；The secondary side winding and transverter of transformer
Ac output end connects.
Optionally, signal collecting device is additionally operable to be used to characterize distributed new transmission system in acquisition transmission line of electricity
The stable operation signal of stable operation；Control module is additionally operable to control transverter adjustment transmission line of electricity according to stable operation signal
Trend.
Optionally, energy storage device is additionally operable to provide when control module control transverter adjusts the trend of transmission line of electricity active
Electric energy.
Optionally, distributed sub-synchronous oscillation restraining device further includes：By-pass switch is arranged in parallel in transverter and transformation
It between device, is connect with control module, for controlling corresponding distributed sub-synchronous oscillation restraining device input or exiting.
According to second aspect, an embodiment of the present invention provides a kind of new energy transmission systems, including：Multiple new energy of distribution
Source electric field；Bus rod, the transmission line of electricity for collecting each distributed new electric field leading-out terminal；In multiple new energy of distribution
It is separately installed with as described in any one of above-described embodiment on transmission line of electricity between source electric field leading-out terminal and bus rod
Distributed sub-synchronous oscillation restraining device.
Distributed sub-synchronous oscillation restraining device and the new energy transmission of electricity that an embodiment of the present invention provides a kind of based on energy storage
System, signal collecting device, sub-synchronous oscillation inhibit equipment and transformer to be installed in one of new energy electric field outlet
On the power transmission line at end, signal collecting device can be directed to the new energy electric field and acquire sub-synchronous oscillation signal, sub-synchronous oscillation suppression
Control equipment can respectively be inhibited for different new energy electric fields, due to subsynchronous the shaking of different new energy electric field generations
The amplitude and frequency swung are possible to different, after grid-connected, lead to the sub-synchronous oscillation problem complex occurred, centralization
Inhibition may cause many sub-synchronous oscillation signals that can not be suppressed, therefore, can be to each new energy electric field respectively into the hand-manipulating of needle
Inhibition to property, to reach preferable inhibition.Also, energy storage device provides active energy for capacitance, stabilizes capacitance two
The fluctuation of terminal voltage.Even if the very low sub-synchronous oscillation of occurrence frequency, due to the support of energy storage device, can also make distributed time
The stable inhibition signal of synchronized oscillation restraining device output, so as to improve the inhibition of distributed sub-synchronous oscillation restraining device
Ability increases and inhibits frequency range.
Description of the drawings
Fig. 1 shows the schematic diagram of the distributed sub-synchronous oscillation restraining device based on energy storage in the embodiment of the present invention；
Fig. 2 shows the signals of the distributed sub-synchronous oscillation restraining device based on energy storage in another embodiment of the present invention
Figure；
Fig. 3 shows the signal of the distributed sub-synchronous oscillation restraining device based on energy storage in another embodiment of the present invention
Figure；
Fig. 4 shows the topological schematic diagram of transverter in the embodiment of the present invention；
Fig. 5 shows another topological schematic diagram of transverter in the embodiment of the present invention；
Fig. 6 shows the schematic diagram of new energy transmission system in the embodiment of the present invention.
Specific implementation mode
Technical scheme of the present invention is clearly and completely described below in conjunction with attached drawing, it is clear that described implementation
Example is a part of the embodiment of the present invention, instead of all the embodiments.Based on the embodiments of the present invention, ordinary skill
The every other embodiment that personnel are obtained without making creative work, shall fall within the protection scope of the present invention.
In addition, term " first ", " second " etc. are used for description purposes only, it is not understood to indicate or imply relative importance.
An embodiment of the present invention provides a kind of distributed sub-synchronous oscillation restraining device based on energy storage, the device are pacified respectively
On outlet line between the leading-out terminal and collection bus of distributed new electric field, it is directed to different new energy electricity respectively
The sub-synchronous oscillation of field is inhibited, as shown in Figure 1, the device includes：
Signal collecting device 10 is connect with transmission line of electricity 1, for acquiring sub-synchronous oscillation signal on transmission line of electricity 1；It is secondary same
Oscillating suppression device 20 is walked, is connect with signal collecting device 10, for exporting sub-synchronous oscillation resistance according to sub-synchronous oscillation signal
Antinoise signal；Transformer 30 inhibits equipment 20 to connect, is installed in series on transmission line of electricity 1 with sub-synchronous oscillation, for according to secondary same
Step oscillatory impedance signal injects sub-synchronous oscillation impedance voltage into transmission line of electricity 1.Energy storage device 40 inhibits with sub-synchronous oscillation
Equipment connects, and inhibits the fluctuation of capacitance both end voltage in equipment for stabilizing sub-synchronous oscillation.
In the present embodiment, sub-synchronous oscillation inhibits in equipment 20 to may include transverter, such as H bridge transverters, passes through
The opening and closing that electron electric power switchs in transverter is controlled, sub-synchronous oscillation impedance signal is exported.In the present embodiment, energy storage device 40
Active energy on major storage transmission line of electricity, since the amplitude of sub-synchronous oscillation voltage is larger, frequency of oscillation is relatively low so that defeated
Voltage and sub-synchronous oscillation on electric wire inhibit the voltage at the capacitor both ends in equipment 20 that larger fluctuation occurs, and work as
When needing to access certain active power support on transmission line of electricity, traditional sub-synchronous oscillation restraining device can not provide help,
Therefore the present embodiment is connected in parallel energy storage device by the both ends of the capacitor in sub-synchronous oscillation inhibition equipment, to effectively stabilize
Voltage fluctuation caused by sub-synchronous oscillation, and provide active support for transmission line of electricity.For example, in new energy electric field stable operation
When, the frequency on transmission line of electricity is power frequency, and when sub-synchronous oscillation occurs, the frequency on transmission line of electricity is doped with lower frequency
The frequency of sub-synchronous oscillation signal, sub-synchronous oscillation signal may only have several hertz, in low-frequency sub-synchronous oscillation signal
Under the influence of, the voltage at capacitance both ends may be made to generate larger fluctuation, and then influence the output of sub-synchronous oscillation restraining device,
Therefore, active energy can be provided for capacitance by energy storage device, stabilizes the fluctuation of capacitance both end voltage.Even if occurrence frequency is very
Low sub-synchronous oscillation, due to the support of energy storage device, the inhibition letter that sub-synchronous oscillation can also be made to inhibit equipment output stable
Number, so as to improve the sub-synchronous oscillation rejection ability that sub-synchronous oscillation inhibits equipment, increase the range for inhibiting frequency.
Again for example：When the output power of new energy electric field is more than the output power of previous moment, energy storage can be given at this time
Equipment charges, the power storage that energy storage device will be absorbed absorbs the output voltage of power grid, to reduce new energy
Source electric field current time is incorporated into the output power of power grid, that is, has stabilized the output voltage of power grid previous moment.When new energy electricity
The output power of field is less than the output power of previous moment, and the DC voltage that energy storage device exports is become alternating voltage, is passed through
Grid integration point is incorporated to power delivery circuit so that energy storage device discharges, and is compensated eventually by the discharge power of energy storage device new
The active power that energy power generation base is lacked when being connected to the grid, that is, compensate for the output voltage of power grid previous moment.Therefore this reality
Output power when new energy electric field is connected to the grid can be absorbed by applying the energy storage device in example, to stabilize because sub-synchronous oscillation is drawn
The fluctuation of the transmission line of electricity voltage risen, stability and new energy electric field so as to effectively improve operation of power networks export electric energy
Quality.
In the present embodiment, energy storage device 40 may include chemical energy storage equipment and Power Flow equipment.Chemical energy storage is set
Standby 40 may include any one in lithium battery, lead-acid battery, sodium-sulphur battery, flow battery, metal-air battery.Electromagnetism stores up
Energy equipment may include super conductive magnetic storage energy equipment and ultracapacitor.
Transmission line of electricity connection between signal collecting device 10 and corresponding new energy electric field and bus rod, it is defeated to acquire this
Electric signal in electric line, and sub-synchronous oscillation signal is extracted from electric signal, which is new energy electricity
Field operation generates.The amplitude and frequency for the sub-synchronous oscillation signal that different new energy electric fields generates are possible to different,
Therefore, targetedly sub-synchronous oscillation inhibition can be carried out respectively to each new energy electric field, inhibit effect to reach preferable
Fruit.
In embodiment optionally, as shown in Fig. 2, signal collecting device 10 may include：Signal gathering unit 11 is used
In acquiring the electric signal in transmission line of electricity 1.Wherein, signal gathering unit 11 may include voltage transformer, current transformer and
At least one of power transformer.Acquire at least one in current signal, voltage signal or the power signal in transmission line of electricity 1
Kind.Since the frequency range of new energy electric field to be generated electricity is wider, frequency is not single, therefore the sub-synchronous oscillation signal frequency generated
Band is wider, is handled electric signal using filter 12, obtains sub-synchronous oscillation signal, in the present embodiment, to adapt to more
Band filter may be used in wide frequency range, filter.Phase compensation unit 13, for being carried out to sub-synchronous oscillation signal
Phase compensation.Specifically, being illustrated by taking electric current as an example, the three-phase current on transmission line of electricity 1 is collected, is obtained by coordinate transform
Electric current under d-q coordinate systems obtains the phase of the electric current on transmission line of electricity 1 by phaselocked loop, according to the electricity after coordinate transform
Stream extraction sub-synchronous oscillation electric current simultaneously carries out phase compensation to sub-synchronous oscillation electric current, finally obtains secondary same on transmission line of electricity 1
Walk oscillator signal.
In an alternate embodiment of the invention, as shown in figure 3, sub-synchronous oscillation inhibits equipment 20 to may include control module 21 and change
Device 22 is flowed, control module 21 can generate pulse switch signal according to sub-synchronous oscillation signal and then control the electricity in transverter 22
Power electronic switch, for example, IGBT opening and closing, and then obtain sub-synchronous oscillation impedance signal.Transformer 30 hinders the sub-synchronous oscillation
Antinoise signal is injected in the form of a voltage in transmission line of electricity 1, to inhibit the sub-synchronous oscillation in transmission line of electricity 1.In the present embodiment
In, due to being inhibited to the sub-synchronous oscillation of single new energy electric field by distributed sub-synchronous oscillation restraining device, become
More light transformer may be used in depressor 30, which can be mounted on transmission line of electricity, for example, spiral-lock transformation
Device.The first side winding series connection access transmission line of electricity 1 of transformer 30；The secondary side winding of transformer 30 is exchanged with transverter 22
Output end connects.
Due to signal collecting device, sub-synchronous oscillation inhibits equipment and transformer to be installed in one of new energy electricity
On power transmission line between field leading-out terminal and bus rod, signal collecting device the new energy electric field can acquire sub-synchronous oscillation with needle
Signal, sub-synchronous oscillation inhibits equipment that can carry out sub-synchronous oscillation inhibition respectively for different new energy electric fields, due to not
The amplitude and frequency for the sub-synchronous oscillation signal that same new energy electric field generates are possible to different, after grid-connected, cause secondary
Synchronized oscillation complex, centralization inhibit to cause many sub-synchronous oscillation signals that can not be suppressed, therefore, can be to each
A new energy electric field is targetedly inhibited respectively, can greatly reduce can not repressed sub-synchronous oscillation signal, to
Reach better inhibition, meanwhile, energy storage device can stabilize the voltage wave that sub-synchronous oscillation inhibits capacitance both ends in equipment
Dynamic, the sub-synchronous oscillation made inhibits equipment output more stable, and inhibition is more preferable.
In the present embodiment, transverter 22 can be H bridge transverters, specifically, Fig. 4 shows the topology of H bridge transverters
Figure, the DC voltage that wherein shunt capacitance C is provided are Vdc, targetedly secondary due to being carried out to new energy electric field in the present embodiment
Synchronized oscillation inhibits, and single IGBT device pressure resistance, flow-resistant capacity can be met the requirements, and may not need using such as multiplex, mostly electricity
The main circuit structure of equality complexity.Sub-synchronous oscillation can be made to inhibit equipment 20 simple in structure, it is light-weight, be conducive to directly mount
On transmission line of electricity 1, the sub-synchronous oscillation restraining device compared to centralization can save a large amount of land resource.In this implementation
In example, H bridge transverters shown in bridge-type H bridges transverter such as Fig. 4 may be used in H bridge transverters；Half-bridge can also be used
Type H bridge transverters H bridges transverter as shown in Figure 5.In the present embodiment, however it is not limited to the H bridges shown in figures 4 and 5
Transverter can also use the cascade compact transverter (attached to be not shown in figure) of more H bridges.More cascade compact changes of current of H bridges
Device can also meet it is simple in structure, light-weight, so as to the requirement being directly mounted on transmission line of electricity 1.
For convenience of it is subsynchronous inhibit equipment input with exit, in an alternate embodiment of the invention, in transverter 22 and transformer
By-pass switch BRK can also be set between 30, and distributed sub-synchronous oscillation restraining device has input and exits two states, has
Body, as shown in figure 4, by-pass switch BRK is arranged in parallel between transverter 22 and transformer 30, the transformer 30 in Fig. 4
Can be series transformer, when by-pass switch BRK is disconnected, distributed sub-synchronous oscillation restraining device is input state, on side
When way switch BRK is closed, distributed sub-synchronous oscillation restraining device is to exit state.By-pass switch BRK include mechanical switch and
Electronic power switch or the mechanical switch and electronic power switch of parallel connection have switch off current and long closure service ability.?
In the present embodiment, by-pass switch BRK is connect with control module 21, control module 21 can control by-pass switch BRK closure and
It disconnects.As device needs control Signal-controlled switch out of service, control module 21 can be closed by output control switch
It is closed.In the present embodiment, control module 21 split can put row control, example into according to the electric signal that signal collecting device acquires
Such as, when collecting sub-synchronous oscillation signal, control switch disconnects, and distributed sub-synchronous oscillation restraining device puts into operation, adopts
When the electric signal integrated is electric field stable operation signal, switch can be controlled and be closed, distributed sub-synchronous oscillation restraining device is made
It is out of service.
In an alternate embodiment of the invention, signal collecting device is additionally operable to distributed new for characterizing in acquisition transmission line of electricity 1
The stable operation signal of energy transmission system stable operation；Control module 21 is additionally operable to control transverter according to stable operation signal
The trend of 22 adjustment transmission lines of electricity 1.
In this embodiment, the control strategy in control module 21 includes mainly following functions：Sub-synchronous oscillation inhibition function,
Power flowcontrol function and sub-synchronous oscillation inhibit the handoff functionality between function and power flowcontrol function.It is subsynchronous according to obtaining
Voltage/current signals build subsynchronous impedance controller, obtain the trigger pulse of transverter 22 under subsynchronous inhibition function, lead to
Opening/closing, the output sub-synchronous oscillation impedance signal for crossing electronic power switch in control converter valve eliminates resonance, inhibition institute wiring
The sub-synchronous oscillation of road；Under power flowcontrol function, according to signals such as obtained voltage, electric current, power, transverter 22 is obtained
Trigger pulse changes the voltage of device output by controlling converter valve, adjusts Line Flow.In the present embodiment, energy storage device
Certain active power support can also be provided when occurring active power shortage on transmission line of electricity.
The embodiment of the present invention additionally provides a kind of new energy transmission system, as shown in fig. 6, including multiple distributed news
Electric field 100, bus rod 200, the transmission line of electricity for collecting each 100 leading-out terminal of distributed new electric field；At multiple points
Be separately installed on transmission line of electricity between cloth new energy electric field 100 and bus rod 200 above-described embodiment description based on
The distributed sub-synchronous oscillation restraining device 300 of energy storage.In the present embodiment, new energy electric field may include wind power plant and photovoltaic
Electric field.
It is separately installed on transmission line of electricity between the leading-out terminal and bus rod of multiple distributed new electric fields point
Cloth sub-synchronous oscillation restraining device targetedly can carry out sub-synchronous oscillation inhibition, compared to intensively to each circuit
The mode of concentrated restraining is carried out after collecting to a plurality of circuit, more targetedly, more can significantly improve distributed new energy
The inhibition of sub-synchronous oscillation in the electric field of source.
Although the embodiments of the invention are described in conjunction with the attached drawings, but those skilled in the art can not depart from this hair
Various modifications and variations can be made in the case of bright spirit and scope, and such modifications and variations are each fallen within by appended claims
Within limited range.
Claims (11)
1. a kind of distributed sub-synchronous oscillation restraining device based on energy storage, which is characterized in that the distribution sub-synchronous oscillation
Restraining device is on the transmission line of electricity between new energy electric field and bus rod, the subsynchronous restraining device packet of distribution
It includes：
Signal collecting device is connect with the transmission line of electricity, for acquiring sub-synchronous oscillation signal on the transmission line of electricity；
Sub-synchronous oscillation inhibits equipment, is connect with the signal collecting device, for being exported according to the sub-synchronous oscillation signal
Sub-synchronous oscillation impedance signal；
Transformer connect with the subsynchronous inhibition equipment, is installed in series on the transmission line of electricity, for same according to described time
Step oscillatory impedance signal injects sub-synchronous oscillation impedance voltage into the transmission line of electricity；
Energy storage device inhibits equipment to connect with the sub-synchronous oscillation, inhibits electricity in equipment for stabilizing the sub-synchronous oscillation
Hold the fluctuation of both end voltage.
2. the distributed sub-synchronous oscillation restraining device based on energy storage as described in claim 1, which is characterized in that the signal
Collecting device includes：
Signal gathering unit is connect with the transmission line of electricity, for acquiring the electric signal in the transmission line of electricity；
Filter is connect with the signal gathering unit, and sub-synchronous oscillation signal is obtained for being filtered to the electric signal；
Phase compensation block is connect with the filter, for carrying out phase compensation to the sub-synchronous oscillation signal.
3. the distributed sub-synchronous oscillation restraining device based on energy storage as claimed in claim 2, which is characterized in that described time same
Walking oscillating suppression device includes：
Transverter is connect with the transmission line of electricity, inhibits the subsynchronous of the sub-synchronous oscillation in the transmission line of electricity for exporting
Impedance signal；
Control module is connect with the signal collecting device and the transverter respectively, for being believed according to the sub-synchronous oscillation
Number control transverter exports the subsynchronous impedance signal.
4. the distributed sub-synchronous oscillation restraining device based on energy storage as claimed in claim 3, which is characterized in that the change of current
Device includes：H bridge transverters.
5. the distributed sub-synchronous oscillation restraining device based on energy storage as claimed in claim 4, which is characterized in that the energy storage
Equipment is in parallel with the capacitor of H bridges transverter.
6. the distributed sub-synchronous oscillation restraining device based on energy storage as claimed in claim 5, which is characterized in that the H bridges
Transverter includes bridge-type H bridges transverter or semi-bridge type H bridge transverters.
7. distributed sub-synchronous oscillation restraining device as claimed in any one of claims 1 to 6, which is characterized in that
The first side winding series connection of the transformer accesses the transmission line of electricity；
The secondary side winding of the transformer is connect with the transverter ac output end.
8. the distributed sub-synchronous oscillation restraining device based on energy storage as claimed in any one of claims 1 to 6, feature exist
In,
The signal collecting device is additionally operable to acquire in the transmission line of electricity
The stable operation signal of system stable operation；
The control module is additionally operable to control the tide that the transverter adjusts the transmission line of electricity according to the stable operation signal
Stream.
9. the distributed sub-synchronous oscillation restraining device based on energy storage as claimed in claim 8, which is characterized in that
The energy storage device is additionally operable to control when the transverter adjusts the trend of the transmission line of electricity in the control module and carry
For active energy.
10. the distributed sub-synchronous oscillation restraining device based on energy storage as claimed in claim 8, which is characterized in that further include：
By-pass switch is arranged in parallel between the transverter and the transformer, is connect with the control module, for controlling
The corresponding distributed sub-synchronous oscillation restraining device input exits.
11. a kind of new energy transmission system, which is characterized in that including：
Multiple distributed new electric fields；
Bus rod, the transmission line of electricity for collecting each distributed new electric field leading-out terminal；
It is separately installed on transmission line of electricity between the multiple distributed new electric field leading-out terminal and bus rod such as power
Profit requires the distributed sub-synchronous oscillation restraining device based on energy storage described in 1-10 any one.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN112909965A (en) * | 2019-11-15 | 2021-06-04 | 智能电线股份有限公司 | Adaptive control technique for impedance injection unit stability |
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