CN208939582U - Distributed sub-synchronous oscillation inhibits device and new energy transmission system - Google Patents
Distributed sub-synchronous oscillation inhibits device and new energy transmission system Download PDFInfo
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- CN208939582U CN208939582U CN201820681983.3U CN201820681983U CN208939582U CN 208939582 U CN208939582 U CN 208939582U CN 201820681983 U CN201820681983 U CN 201820681983U CN 208939582 U CN208939582 U CN 208939582U
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Abstract
The utility model provides a kind of distributed sub-synchronous oscillation and inhibits device and new energy transmission system, wherein, distributed sub-synchronous oscillation inhibits device to be separately mounted on the transmission line of electricity between distributed new electric field leading-out terminal and bus rod, it include: signal collecting device, it is connect with transmission line of electricity, for acquiring the sub-synchronous oscillation signal of distributed subsynchronous new energy electric field respectively；Sub-synchronous oscillation inhibits equipment, connect with signal collecting device, for exporting sub-synchronous oscillation impedance signal according to sub-synchronous oscillation signal；Transformer inhibits equipment to connect with sub-synchronous oscillation, and is installed in series on the transmission line, for injecting sub-synchronous oscillation impedance voltage into transmission line of electricity according to sub-synchronous oscillation impedance signal.The distributed sub-synchronous oscillation of the utility model inhibits device that can targetedly carry out subsynchronous inhibition respectively to each new energy electric field, can greatly reduce can not repressed sub-synchronous oscillation signal, to reach better inhibitory effect.
Description
Technical field
The utility model relates to field of new energy technologies, and in particular to a kind of distributed sub-synchronous oscillation inhibit device and
New energy transmission system.
Background technique
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 had found 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 and efficient operation of Chinese large-sized new energy faces.
Typical sub-synchronous oscillation inhibits device to be broadly divided into parallel connection type sub-synchronous oscillation and inhibits device and tandem type at present
Sub-synchronous oscillation inhibits two class of device, has obtained excellent effect in terms of inhibiting thermoelectricity sub-synchronous oscillation.
But it since existing new energy sub-synchronous oscillation inhibits device, often concentrates and is fixed on source side or power transmission line
Lu Zhong carries out centralized inhibition to the sub-synchronous oscillation of all routes, however, since the operation conditions of each new energy electric field is deposited
In biggish difference, the case where distributed new grid-connected bring sub-synchronous oscillation, is complex, using existing subsynchronous
Sub-synchronous oscillation after oscillation suppression technology is grid-connected to distributed new electric field inhibits, and also needs to consider on grid-connected route
Sub-synchronous oscillation that is subsynchronous to inhibit the phenomenon that signal is distributed to each new energy electric field, being generated due to different new energy electric fields
Amplitude and frequency be possible to different, after grid-connected, lead to sub-synchronous oscillation complex, a plurality of route collected laggard
The mode of row concentrated restraining may cause many sub-synchronous oscillation signals and can not be suppressed, undesirable so as to cause inhibitory effect.
Utility model content
It is same the technical problem to be solved by the present invention is to how improve distributed new electric field grid-connected bring time
Walk the inhibitory effect of oscillation.
The utility model embodiment provides a kind of distributed sub-synchronous oscillation inhibition device, distributed sub-synchronous oscillation suppression
Device processed is separately mounted on the transmission line of electricity between distributed new electric field leading-out terminal and bus rod, sub-synchronous oscillation suppression
Device processed includes: signal collecting device, is connect with transmission line of electricity, for acquiring time of distributed subsynchronous new energy electric field respectively
Synchronized oscillation signal；Sub-synchronous oscillation inhibits equipment, connect with signal collecting device, for being exported according to sub-synchronous oscillation signal
Sub-synchronous oscillation impedance signal；Transformer inhibits equipment to connect with sub-synchronous oscillation, and is installed in series on the transmission line, uses
In injecting sub-synchronous oscillation impedance voltage into transmission line of electricity according to sub-synchronous oscillation impedance signal.
Optionally, signal collecting device includes: signal acquisition unit, is connect with transmission line of electricity, for acquiring transmission line of electricity
In electric signal；Filter is connect with signal acquisition unit, obtains sub-synchronous oscillation signal for being filtered to electric signal；
Phase compensation unit is connect with filter, for carrying out phase compensation to sub-synchronous oscillation signal.
Optionally, oscillating suppression device includes: control module, is connect with signal collecting device, for according to subsynchronous vibration
Swing signal output control signal；Inverter is connect with transmission line of electricity, for exporting sub-synchronous oscillation under control of the control signal
Impedance signal.
Optionally, inverter includes: H bridge inverter.
Optionally, H bridge inverter includes bridge-type H bridge inverter or semi-bridge type H bridge inverter.
Optionally, signal collecting device is also used to acquire is used to characterize distributed new transmission system in transmission line of electricity
The stable operation signal of transmission of electricity stable operation；Control module is also used to control inverter adjustment power transmission line according to stable operation signal
The trend on road.
Optionally, the first side winding series connection access transmission line of electricity of transformer；The secondary side winding and inverter of transformer
Ac output end connection.
Optionally, distributed sub-synchronous oscillation inhibits device further include: by-pass switch is arranged in parallel in inverter and transformation
It between device, is connect with control module, for executing opening/closing movement under the control of control module.
According to second aspect, the utility model embodiment provides a kind of new energy transmission system, comprising: multiple distributions
New energy electric field；Bus rod, for collecting the transmission line of electricity of each distributed new electric field；In multiple distributed news
The distributed sub-synchronous oscillation that electric field leading-out terminal and bus rod are in series with above-mentioned first aspect any one description inhibits device.
The utility model embodiment provides a kind of distributed sub-synchronous oscillation inhibition device, which respectively corresponds installation
On transmission line of electricity between distributed new electric field leading-out terminal and bus rod, adopted by the signal collecting device of the device
Collect the sub-synchronous oscillation signal on transmission line of electricity, and the sub-synchronous oscillation signal of acquisition is delivered to sub-synchronous oscillation and inhibits equipment
In, sub-synchronous oscillation inhibits equipment to export sub-synchronous oscillation impedance signal according to the sub-synchronous oscillation signal, is connected on power transmission line
The transformer of road injects sub-synchronous oscillation impedance voltage into transmission line of electricity according to sub-synchronous oscillation impedance signal.Distributed time
Synchronized oscillation inhibits device only to pass through the sub-synchronous oscillation signal for acquiring corresponding new energy electric field, can be targetedly to each
The route of new energy electric field carries out subsynchronous inhibition, compared to the side for carrying out concentrated restraining after the collecting to a plurality of route of concentration
Formula, more targetedly, to improve inhibitory effect.
Detailed description of the invention
Fig. 1 shows the schematic diagram that distributed sub-synchronous oscillation in the utility model embodiment inhibits device；
Fig. 2 shows the schematic diagrames that sub-synchronous oscillation distributed in another embodiment of the utility model inhibits device；
Fig. 3 shows the schematic diagram that distributed sub-synchronous oscillation in another embodiment of the utility model inhibits device；
Fig. 4 shows the topological schematic diagram of inverter in the utility model embodiment；
Fig. 5 shows another topological schematic diagram of inverter in the utility model embodiment；
Fig. 6 shows the schematic diagram of new energy transmission system in the utility model embodiment.
Specific embodiment
The technical solution of the utility model is clearly and completely described below in conjunction with attached drawing, it is clear that described
Embodiment is the utility model a part of the embodiment, instead of all the embodiments.Based on the embodiments of the present invention, originally
Field those of ordinary skill every other embodiment obtained without making creative work belongs to practical
Novel protected range.In addition, term " first ", " second " etc. are used for description purposes only, it is not understood to indicate or imply
Relative importance.
The utility model embodiment provides a kind of distributed sub-synchronous oscillation and inhibits device, which is separately mounted to point
On transmission line of electricity between cloth new energy electric field leading-out terminal and bus rod, on the outlet line of distributed new electric field
Distributed sub-synchronous oscillation is installed respectively and inhibits device, is pressed down respectively for the sub-synchronous oscillation of different new energy electric fields
System, as shown in Figure 1, sub-synchronous oscillation inhibition 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, and is installed in series on transmission line of electricity 1 with sub-synchronous oscillation, for according to secondary
Synchronized oscillation impedance signal injects sub-synchronous oscillation impedance voltage into transmission line of electricity 1.In the particular embodiment, signal acquisition
Transmission line of electricity 1 between equipment 10 and corresponding new energy electric field leading-out terminal and bus rod connects, and acquires the route electric signal,
And sub-synchronous oscillation signal is extracted from electric signal, which is that new energy electric field operation generates.It is different
The amplitude of sub-synchronous oscillation that generates of new energy electric field and frequency be possible to different, therefore, can be to each new energy
Electric field carries out targetedly subsynchronous inhibition respectively, to reach preferable inhibitory effect.
In an alternate embodiment of the invention, it as shown in Fig. 2, signal collecting device 10 may include: signal acquisition unit 11, is used for
Acquire the electric signal in transmission line of electricity 1.Wherein, signal acquisition unit 11 may include voltage transformer, current transformer and function
At least one of rate mutual inductor.So-called electric signal may include in current signal, voltage signal or power signal at least
It is a kind of.Since the electricity frequency range of new energy electric field is wider, frequency is not single, therefore the sub-synchronous oscillation signal generated
Frequency band is wider, is filtered using filter 12 to electric signal, obtains sub-synchronous oscillation signal, in the present embodiment, filter
Wave device 12 may include band filter.Phase compensation unit 13, for carrying out phase compensation to sub-synchronous oscillation signal.Specifically
, it is illustrated by taking electric current as an example, collects the three-phase current on transmission line of electricity 1, obtain d-q axis coordinate system by coordinate transform
Under electric current, the phase of the electric current on transmission line of electricity 1 is obtained by phaselocked loop, it is subsynchronous according to the current draw after coordinate transform
Current signal simultaneously carries out phase compensation to secondary same current signal, finally obtains the sub-synchronous oscillation signal on transmission line of electricity 1.
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 inverter 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, transformer 30 can use more light transformer, which can mount on the line, for example, can use
Spiral-lock transformer, also, the first side winding series connection access transmission line of electricity 1 of transformer 30；The secondary side winding of transformer 30 with
The ac output end of inverter 22 connects.
Due to signal collecting device, sub-synchronous oscillation inhibits equipment and transformer to be installed in one of new energy electricity
On the power transmission line of field leading-out terminal, signal collecting device can be subsynchronous with the acquisition sub-synchronous oscillation signal of the needle new energy electric field
Oscillating suppression device can be inhibited respectively for different new energy electric fields, time generated due to different new energy electric fields
The amplitude and frequency of synchronized oscillation are possible to different, after grid-connected, lead to sub-synchronous oscillation complex, to a plurality of route
The mode that concentrated restraining is carried out after collecting, which may cause many sub-synchronous oscillation signals, to be suppressed, therefore, can be to each
New energy electric field carries out targetedly subsynchronous inhibition respectively, can greatly reduce can not repressed sub-synchronous oscillation signal,
To reach better inhibitory effect.
In the present embodiment, inverter 22 can be H bridge inverter, specifically, Fig. 4 shows the topology of H bridge inverter
Figure, the DC voltage that wherein shunt capacitance C is provided are Vdc, in the present embodiment due to carrying out targetedly to new energy electric field
Sub-synchronous oscillation inhibits, and the pressure resistance of single IGBT device, flow-resistant capacity can satisfy requirements, may not need using such as multiplex, more
The main circuit structure of the complexity such as level.Sub-synchronous oscillation can be made to inhibit 20 structure of equipment simple, it is light-weight, be conducive to directly hang
On transmission line of electricity 1, the sub-synchronous oscillation compared to centralization inhibits equipment 20 that can save a large amount of land resource.At this
In embodiment, H bridge inverter can use bridge-type H bridge inverter H bridge inverter as shown in Figure 4；It can also be using half
Bridge type H bridge inverter H bridge inverter as shown in Figure 5.In the present embodiment, however it is not limited to the H shown in figures 4 and 5
Bridge inverter can also use the cascade compact inverter (being not shown in the drawings) of more H bridges.More cascade compacts of H bridge
Inverter also can satisfy the requirement that structure is simple, light-weight, to be directly mounted on transmission line of electricity 1.
Inhibit the investment of device for convenience of distributed sub-synchronous oscillation and exit, in an alternate embodiment of the invention, in inverter
By-pass switch BRK can also be set between 22 and transformer 30, and distributed sub-synchronous oscillation inhibits device to have investment and exit
Two states, specifically, as shown in figure 4, by-pass switch BRK is arranged in parallel between inverter 22 and transformer 30, in Fig. 4
Transformer 30 can be series transformer, when by-pass switch BRK is disconnected, it is investment that distributed sub-synchronous oscillation, which inhibits device,
State, in by-pass switch BRK closure, it is to exit state that distributed sub-synchronous oscillation, which inhibits device,.By-pass switch BRK includes machine
Tool switch and electronic power switch or the mechanical switch and electronic power switch of parallel connection have switch off current and long closure operation
Ability.In the present embodiment, by-pass switch BRK is connect with control module 21, and control module 21 can control by-pass switch BRK's
Open and close.As device needs control signal control out of service, control module 21 can be closed by output control switch
System closes the switch.In the present embodiment, the electric signal that control module 21 can be acquired according to signal collecting device is split to put row into
Control, for example, control switch disconnects when collecting sub-synchronous oscillation signal, distributed sub-synchronous oscillation inhibits device investment
Operation can control and close the switch when collected electric signal is electric field stable operation signal, press down distributed sub-synchronous oscillation
Device processed is out of service.
In an alternate embodiment of the invention, acquisition device is also used to acquire is used to characterize distributed new in transmission line of electricity 1
The stable operation signal of stable operation；Control module 21, which is also used to control inverter 22 according to stable operation signal, adjusts power transmission line
The trend on road 1.
In this embodiment, the control strategy in control module 21 mainly includes 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 construct subsynchronous impedance controller, obtain the trigger pulse of inverter 22 under subsynchronous inhibition function, lead to
It is opening/closing to cross electronic power switch in control converter valve, exports sub-synchronous oscillation impedance signal, eliminates resonance, inhibits institute's wiring road
On sub-synchronous oscillation signal；Under power flowcontrol function, according to signals such as obtained voltage, electric current, power, inverter is obtained
22 trigger pulses are changed the voltage of device output by control converter valve, adjust Line Flow.
The utility model embodiment additionally provides a kind of new energy transmission system, as shown in fig. 6, including multiple distributed new
Energy electric field 100, bus rod 200, for collecting the transmission line of electricity of each 100 leading-out terminal of distributed new electric field；More
Above-mentioned implementation is separately installed on transmission line of electricity between the leading-out terminal and bus rod 200 of a distributed new electric field 100
The distributed sub-synchronous oscillation of example description inhibits device 300.In the present embodiment, as shown in fig. 6, series transformer is with power transmission line
Road 1 is used as first side winding, is connected on transmission line of electricity 1.
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 inhibits device, can be inhibited respectively for different new energy electric fields, due to different new energy
The amplitude and frequency for the sub-synchronous oscillation that electric field generates are possible to different, after grid-connected, cause sub-synchronous oscillation extremely multiple
Miscellaneous, the mode that concentrated restraining is carried out after collecting to a plurality of route, which may cause many sub-synchronous oscillation signals, to be suppressed, because
This, can targetedly inhibit each new energy electric field respectively, and can greatly reduce can not repressed subsynchronous vibration
Signal is swung, to reach better inhibitory effect.
Although being described in conjunction with the accompanying the embodiments of the present invention, those skilled in the art can not departed from
Various modifications and variations can be made in the case where the spirit and scope of the utility model, and such modifications and variations are each fallen within by appended
Within claim limited range.
Claims (9)
1. a kind of distribution sub-synchronous oscillation inhibits device, which is characterized in that the distribution sub-synchronous oscillation inhibits device point
It is not mounted on the transmission line of electricity between distributed new electric field leading-out terminal and bus rod, the sub-synchronous oscillation inhibits dress
It sets and includes:
Signal collecting device is connect with the transmission line of electricity, for acquiring the subsynchronous of the distributed new electric field respectively
Oscillator signal；
Sub-synchronous oscillation inhibits equipment, connect with the signal collecting device, for being exported according to the sub-synchronous oscillation signal
Sub-synchronous oscillation impedance signal；
Transformer inhibits equipment to connect, is installed in series on the transmission line of electricity, for according to the sub-synchronous oscillation
Sub-synchronous oscillation impedance signal injects sub-synchronous oscillation impedance voltage into the transmission line of electricity.
2. distribution sub-synchronous oscillation as described in claim 1 inhibits device, which is characterized in that the signal collecting device packet
It includes:
Signal acquisition 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 acquisition unit, obtains sub-synchronous oscillation signal for being filtered to the electric signal；
Phase compensation unit is connect with the filter, for carrying out phase compensation to sub-synchronous oscillation signal.
3. distribution sub-synchronous oscillation as claimed in claim 2 inhibits device, which is characterized in that the sub-synchronous oscillation inhibits
Equipment includes:
Control module is connect with the signal collecting device, for exporting control signal according to sub-synchronous oscillation signal；
Inverter is connect with the transmission line of electricity, for exporting the sub-synchronous oscillation resistance under the control of said control signal
Antinoise signal.
4. distribution sub-synchronous oscillation as claimed in claim 3 inhibits device, which is characterized in that the inverter includes: H bridge
Inverter.
5. distribution sub-synchronous oscillation as claimed in claim 4 inhibits device, which is characterized in that the H bridge inverter includes
Bridge-type H bridge inverter or semi-bridge type H bridge inverter.
6. the distributed sub-synchronous oscillation as described in claim 3-5 any one inhibits device, which is characterized in that
The signal collecting device is also used to acquire steady for characterizing the distributed new electric field in the transmission line of electricity
Surely the stable operation signal run；
The control module is also used to control the tide that the inverter adjusts the transmission line of electricity according to the stable operation signal
Stream.
7. the distributed sub-synchronous oscillation as described in claim 3-5 any one inhibits device, 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 ac output end of the inverter.
8. the distributed sub-synchronous oscillation as described in claim 3-5 any one inhibits device, which is characterized in that further include:
By-pass switch is arranged in parallel between the inverter and the transformer, is connect with the control module, in institute
It states and executes opening/closing movement under the control of control module.
9. a kind of new energy transmission system characterized by comprising
Multiple distributed new electric fields；
Bus rod, for collecting the transmission line of electricity of each distributed new electric field；
It is in series with respectively on transmission line of electricity between the multiple distributed new electric field leading-out terminal and the bus rod
Distributed sub-synchronous oscillation as described in claim 1-8 any one inhibits device.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108667044A (en) * | 2018-05-08 | 2018-10-16 | 全球能源互联网研究院有限公司 | Distributed sub-synchronous oscillation restraining device and new energy transmission system |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108667044A (en) * | 2018-05-08 | 2018-10-16 | 全球能源互联网研究院有限公司 | Distributed sub-synchronous oscillation restraining device and new energy transmission system |
| CN108667044B (en) * | 2018-05-08 | 2024-03-01 | 全球能源互联网研究院有限公司 | Distributed subsynchronous oscillation suppression device and new energy power transmission system |
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