CN208257420U - A kind of sub-synchronous oscillation inhibits device and power grid output system - Google Patents
A kind of sub-synchronous oscillation inhibits device and power grid output system Download PDFInfo
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Abstract
The utility model discloses a kind of sub-synchronous oscillation and inhibits device and power grid output system, sub-synchronous oscillation inhibits device including signal collecting device, its leading-out terminal for connecting bus rod, for acquiring the electrical parameter information on transmission line of electricity, electrical parameter information includes current parameters or voltage parameter or power parameter；Series transformer, primary side are separately connected the leading-out terminal of bus rod and by terminal circuits；Voltage source converter, output end are connected in parallel the secondary side of series transformer, for carrying out the change of current according to electrical parameter information；Accumulator is connected in parallel voltage source converter, for the output voltage by the stable electric power voltage source converter on storage transmission line of electricity.The utility model, which is connected in parallel voltage source converter by setting accumulator, can stabilize the output voltage fluctuation of electrical network access point and the output voltage fluctuation of voltage source converter, be conducive to the stability of the stability for improving operation of power networks and power grid output electric energy.
Description
Technical field
The utility model relates to power electronic equipment technical fields, and in particular to a kind of sub-synchronous oscillation inhibits device and electricity
Net output system.
Background technique
Sub-synchronous oscillation (SSR) is extremely common in electric system and a kind of huge low-frequency oscillation of harm.With new energy
The extensive use greatly developed with power electronic technique in source, extensive new energy base, which is concatenated compensation or sends out through direct current, is
There are the sub-synchronous oscillation phenomenons of frequency time-varying in system.Such as: the new energy of China's the first mends time of access transmission system through string
Synchronized oscillation accident occurs to have occurred so far much after this area's string is mended and put into operation within 2010 by wind turbine in Zhangjiakou Guyuan area
Sub-synchronous oscillation problem caused by group and string are mended causes grid equipment operation exception and a large amount of blower off-grids, seriously threatens power grid
Safe and stable operation.In recent years, successively there is sub-synchronous oscillation phenomenon in the wind power plant on the ground such as the Xinjiang in China, Jilin, Guangdong
Lead to a large amount of power grid accident.It can be seen that risk brought by sub-synchronous oscillation can not be ignored, in order to implement grid side reply
The strategy of sub-synchronous oscillation risk has gradually caused the extensive concern of academia and production run department.
Sub-synchronous oscillation traditional at present inhibits dress to generally require to carry out inhibition sub-synchronous oscillation by reactive power compensation,
Since the amplitude of sub-synchronous oscillation voltage is larger, frequency of oscillation is lower so that in reactive power compensation circuit capacitor both ends electricity
The raw biggish fluctuation of pressure can generally choose the biggish capacitor of capacitance in reactive power compensation circuit and stabilize sub-synchronous oscillation and draw
The biggish voltage fluctuation of electrical network access point is played, but the biggish capacitor cost of capacitance is larger, and then leads to entire sub-synchronous oscillation
Inhibit the increased costs of device.
Utility model content
Therefore, the utility model embodiment technical problems to be solved are that sub-synchronous oscillation in the prior art inhibits electricity
The road selection biggish capacitor of capacitance stabilizes sub-synchronous oscillation and causes the biggish voltage fluctuation of electrical network access point, but capacitance is biggish
Capacitor cost is larger, and then leads to the increased costs of entire sub-synchronous oscillation inhibition device.
For this purpose, the utility model embodiment provides following technical solution:
The utility model embodiment provides a kind of sub-synchronous oscillation inhibition device, comprising:
Signal collecting device connects the leading-out terminal of bus rod, for acquiring the electrical parameter information on transmission line of electricity, institute
Stating electrical parameter information includes current parameters or voltage parameter or power parameter；
Series transformer, primary side are separately connected the leading-out terminal of the bus rod and by terminal circuits；
Voltage source converter, output end are connected in parallel the secondary side of the series transformer, for being joined according to the electricity
Number information carries out the change of current；
Accumulator is connected in parallel the voltage source converter, for by storing the electric energy on the transmission line of electricity
Stablize the output voltage of the voltage source converter.
Optionally, the accumulator includes the first capacitor being sequentially connected in series and the first inductance.
Optionally, the accumulator includes the second capacitor, the second inductance and controllable switch being sequentially connected in series.
Optionally, the accumulator includes several energy-storage batteries being sequentially connected in series.
Optionally, the sub-synchronous oscillation inhibits device, further includes:
Subsynchronous data extraction device connects the signal collecting device, for extracting from the electrical parameter information
Subsynchronous signal；
Equipment is controlled, the input terminal of the subsynchronous data extraction device and the voltage source converter is separately connected,
Start pulse signal is generated according to the subsynchronous signal that the subsynchronous data extraction device is extracted, controls the energy storage electricity
Stablize the output voltage of the voltage source converter in road.
Optionally, the voltage source converter is bridge-type structure or semi-bridge type structure.
Optionally, the signal collecting device includes voltage transformer or one of current transformer or power transformer
Or it is several.
Optionally, the subsynchronous data extraction device further include:
Filter connects the signal collecting device, the subsynchronous signal for extracting to the signal collecting device
It is filtered.
Phase compensator connects the filter, for the subsynchronous signal after the filter filtering into
Row phase compensation and correction.
The utility model embodiment provides a kind of power grid output system, inhibits device including the sub-synchronous oscillation, also
Include:
Generation of electricity by new energy base comprising the input terminal of power grid is arranged in multiple generation of electricity by new energy stations, is used for the electricity
Net provides electric energy；
The bus rod connects the generation of electricity by new energy base, for exporting the multiple generation of electricity by new energy station
Electric energy collected；
Step-up transformer, the voltage for exporting to the bus rod boost.
Optionally, the generation of electricity by new energy station is wind power station or photo-voltaic power generation station.
The utility model embodiment technical solution, has the advantages that
The utility model provides a kind of sub-synchronous oscillation and inhibits device and power grid output system, and wherein sub-synchronous oscillation inhibits
Device includes: signal collecting device, connects the leading-out terminal of bus rod, for acquiring the electrical parameter information on transmission line of electricity,
Electrical parameter information includes current parameters or voltage parameter or power parameter；Series transformer, it is female that primary side is separately connected confluence
The leading-out terminal of line with by terminal circuit；Voltage source converter, output end are connected in parallel the secondary side of series transformer, are used for basis
Electrical parameter information carries out the change of current；Accumulator is connected in parallel voltage source converter, for passing through the electricity on storage transmission line of electricity
The output voltage of energy steady voltage source inverter.The utility model is connected in parallel voltage source converter by setting accumulator can
To stabilize the output voltage fluctuation of electrical network access point and the output voltage fluctuation of voltage source converter, be conducive to improve power grid fortune
The stability of capable stability and power grid output electric energy.
Detailed description of the invention
It, below will be right in order to illustrate more clearly of specific embodiment of the present invention or technical solution in the prior art
Specific embodiment or attached drawing needed to be used in the description of the prior art are briefly described, it should be apparent that, it is described below
In attached drawing be that some embodiments of the utility model are not paying creativeness for those of ordinary skill in the art
Under the premise of labour, it is also possible to obtain other drawings based on these drawings.
Fig. 1 is the structural schematic diagram that sub-synchronous oscillation inhibits device in the utility model embodiment 1；
Fig. 2A is the first circuit diagram of voltage source converter in the utility model embodiment 1；
Fig. 2 B is the second circuit schematic diagram of voltage source converter in the utility model embodiment 1；
Fig. 2 C is the tertiary circuit schematic diagram of voltage source converter in the utility model embodiment 1；
Fig. 2 D is the 4th circuit diagram of voltage source converter in the utility model embodiment 1；
Fig. 3 A is the first circuit diagram of accumulator in the utility model embodiment 1；
Fig. 3 B is the second circuit schematic diagram of accumulator in the utility model embodiment 1；
Fig. 3 C is the tertiary circuit schematic diagram of accumulator in the utility model embodiment 1；
Fig. 3 D is the 4th circuit diagram of accumulator in the utility model embodiment 1；
Fig. 4 is the schematic diagram that control equipment carries out subsynchronous signal extraction and phase compensation in the utility model embodiment 1；
Fig. 5 is the structural schematic diagram of power grid output system in the utility model embodiment 2；
Fig. 6 is the Simulation of SAR power image figure that sub-synchronous oscillation inhibition device inhibits subsynchronous signal in the utility model embodiment 2.
Appended drawing reference:
1- sub-synchronous oscillation inhibits device；11- signal collecting device；The subsynchronous data extraction device of 12-；
13- controls equipment；14- series transformer；15- voltage source converter；
16- accumulator；21- generation of electricity by new energy base；22- bus rod；
23- step-up transformer.
Specific embodiment
It is clearly and completely described below in conjunction with technical solution of the attached drawing to the utility model embodiment, it is clear that institute
The embodiment of description is the utility model a part of the embodiment, instead of all the embodiments.Based on the reality in the utility model
Example is applied, every other embodiment obtained by those of ordinary skill in the art without making creative efforts all belongs to
In the range of the utility model protection.
In the description of the utility model embodiment, it should be noted that term " center ", "upper", "lower", " left side ",
The orientation or positional relationship of the instructions such as " right side ", "vertical", "horizontal", "inner", "outside" is orientation based on the figure or position
Relationship, be merely for convenience of description the utility model embodiment and simplify description, rather than the device of indication or suggestion meaning or
Element must have a particular orientation, be constructed and operated in a specific orientation, therefore should not be understood as the limit to the utility model
System.In addition, term " first ", " second ", " third " are used for description purposes only, it is not understood to indicate or imply relatively important
Property.
In the description of the utility model embodiment, it should be noted that unless otherwise clearly defined and limited, term
" installation ", " connected ", " connection " shall be understood in a broad sense, for example, it may be fixedly connected, may be a detachable connection or one
Connect to body；It can be mechanical connection, be also possible to be electrically connected；It can be directly connected, it can also be indirect by intermediary
It is connected, can also be the connection inside two elements, can be wireless connection, be also possible to wired connection.For this field
For those of ordinary skill, the concrete meaning of above-mentioned term in the present invention can be understood with concrete condition.
In addition, as long as technical characteristic involved in the utility model different embodiments disclosed below is each other
Not constituting conflict can be combined with each other.
Embodiment 1
The utility model embodiment provides a kind of sub-synchronous oscillation inhibition device, as shown in Figure 1, comprising: respectively include letter
Number acquisition equipment 11, series transformer 14, voltage source converter 15 and accumulator 16.Wherein, signal collecting device 11, string
Connection transformer 14, voltage source converter 15 and accumulator 16 may be located on the transmission of electricity where the leading-out terminal of bus rod 22
On route.
Specifically, signal collecting device 11 are arranged on the transmission line of electricity connecting with the leading-out terminal of bus rod 22, are used for
The electrical parameter information on transmission line of electricity is acquired, which includes current parameters or voltage parameter or power parameter.Herein
Signal collecting device 11 can be voltage transformer or current transformer or power transformer, signal collecting device 11 is why
It is arranged on the transmission line of electricity being connect with the leading-out terminal of bus rod 22, is because grid side transmission line of electricity can be acquired out directly
On the total subsynchronous signal of electrical parameter information and then available new energy wind power plant and carry out concentrated restraining.Signal acquisition is set
Standby 11 electrical parameter information collected are mainly the first voltage U on transmission line of electricitySWith the first electric current IS, bus rod 22 go out
The second electric current I on transmission line of electricity between line end and voltage source converter 15L, first voltage U is acquired using voltage transformerS,
The first electric current I is acquired using current transformerS, the second electric current IL, three-phase current I on transmission line of electricityLa1、ILb1And ILc1.Signal
Acquisition equipment 11 can acquire the subsynchronous signal of power grid transmission line road different frequency scope, and then time in the present embodiment
Synchronized oscillation inhibits device that can be carried out effectively inhibiting to the subsynchronous signal of different frequency scope.
Series transformer 14, primary side a are separately connected the leading-out terminal of bus rod 22 and by terminal circuits 20.In Fig. 1
In, it can be seen that the secondary side of series transformer 14 is b, primary side a, the secondary side b connection voltage source of series transformer 14
Inverter 15, the primary side a of series transformer 14 are connected in series the input terminal of bus rod 22 with by terminal circuit 20 respectively, connect
The primary side a of transformer 14 is also connected with signal collecting device 11, and series transformer 14 inhibits the defeated of device 1 with sub-synchronous oscillation
Outlet is connected in series to form series compensation circuit, and 14 one side of series transformer may be implemented impedance matching, on the other hand realize
For inhibiting the output end injection of device 1 to inhibit the voltage parameter of subsynchronous signal to sub-synchronous oscillation.
Voltage source converter 15, output end are connected in parallel the secondary side b of the series transformer 14, for according to
Electrical parameter information carries out the change of current.Specifically, the voltage source converter 15 in the present embodiment can be bridge-type structure, specially H
Bridge inverter, H bridge inverter, as shown in Figure 2 A, H bridge inverter include four IGBT device T1、T2、T3、T4Be connected in parallel on H bridge
Third capacitor C between inverter3Bridge-type structure is formed, the electricity as other interchangeable embodiments, in the present embodiment
Source Con-verters 15 can also be semi-bridge type structure, and as shown in Figure 2 B, voltage source converter 15 includes two IGBT device T5、T6
And the 6th capacitor C being connected in parallel between voltage source converter 156Form semi-bridge type structure.
Specifically, the voltage source converter 15 in the present embodiment can also be MMC converter valve, and as shown in Fig. 2 C, MMC is changed
Flowing valve includes two IGBT device T1、T2And the 5th capacitor C being connected in parallel between MMC converter valve5Form half-bridge circuit.As it
Its interchangeable embodiment, as shown in Figure 2 D, MMC converter valve can also include four IGBT device T5、T6、T7、T8.Simultaneously
The 4th capacitor C being associated between MMC converter valve device4Form bridge-type structure.The main function of voltage source converter 15 is exactly pair
The electric current of power grid transmission line road carries out the change of current.Specifically, may be implemented by or off will be straight for voltage source converter 15
Galvanic electricity inversion is the alternating current of some frequency or variable frequency, finally makes voltage source converter under the action of pulse width is modulated
The output voltage of device 15, which changes, to be realized and Power Exchange is occurred by terminal circuit 20 to inhibit subsynchronous signal.
Accumulator 16 is connected in parallel voltage source converter 15, for passing through the stable electric power on storage transmission line of electricity
The output voltage of voltage source converter 15.Specifically, accumulator 16 is connected in the capacitor in voltage source converter 15 in parallel
Both ends, as shown in Figure 3A, the active energy on 16 major storage transmission line of electricity of accumulator, since voltage source converter 15 exists
During work generally by output reactive power inhibit sub-synchronous oscillation, but due to the amplitude of sub-synchronous oscillation voltage compared with
Greatly, frequency of oscillation is lower, so that the voltage generation at the capacitor both ends of power grid output voltage and voltage source converter 15 is larger
Fluctuation, and when power grid transmission line road needs to access certain active power support, traditional sub-synchronous oscillation inhibits
Device can not also provide help.Therefore the present embodiment is connected in parallel energy storage dress by the both ends of the capacitor in voltage source converter 15
Voltage fluctuation caused by subsynchronous signal can effectively be stabilized by setting, and be provided with function support for grid power transmission route.Such as: when
When the output power in generation of electricity by new energy base is greater than the output power of previous moment, voltage source converter 15 is by generation of electricity by new energy base
Ground is converted into DC voltage by the alternating voltage of grid integration point, i.e. the realization change of current can carry out at this time to accumulator 16
Charging, the power storage that accumulator 16 will be absorbed absorbs the output voltage of power grid, to reduce generation of electricity by new energy
Base current time is incorporated into the output power of power grid, that is, has stabilized the output voltage of power grid previous moment.Such as: work as new energy
The output power in power generation base is less than the output power of previous moment, the direct current that voltage source converter 15 exports accumulator 16
Voltage becomes alternating voltage, to be connected to the grid by grid integration point, so that accumulator 16 discharges, eventually by energy storage
The active power that the discharge power compensation generation of electricity by new energy base of circuit 16 is lacked when being connected to the grid, that is, it is previous to compensate for power grid
The output voltage at moment.Therefore the accumulator 16 in the present embodiment can be absorbed it is defeated when generation of electricity by new energy base is connected to the grid
Power out, to stabilize because of sub-synchronous oscillation caused by power grid output voltage fluctuate, so as to effectively improve the steady of operation of power networks
The quality of qualitative and power grid output electric energy.
Accumulator 16 in the utility model embodiment, as shown in Figure 3B, including the first capacitor C being sequentially connected in series1
With the first inductance L1, first capacitor C1With the first inductance L1It is sequentially connected in series in parallel with the capacitor of voltage source converter 15 afterwards
Connection.As other interchangeable embodiments, as shown in Fig. 3 C, accumulator 16 can also include being sequentially connected in series
Second capacitor C2, the second inductance L2With controllable switch S1, the second capacitor C2, the second inductance L2With controllable switch S1It is sequentially connected in series
The capacitor with voltage source converter 15 is connected in parallel afterwards, wherein controllable switch S1Accumulator 16 can be made in due course as needed
Circuit is accessed, such as: if voltage fluctuation caused by the sub-synchronous oscillation of power grid transmission line road is not especially severe, Ke Yixuan
Select shutdown controllable switch S1Accumulator 16 is not allowed to access circuit, if electricity caused by the sub-synchronous oscillation of power grid transmission line road
Pressure fluctuation is very serious, can choose conducting controllable switch S1So that accumulator 16 accesses circuit and stabilizes the voltage fluctuation.As
Other interchangeable embodiments, as shown in Figure 3D, the energy-storage battery that accumulator 16 can be sequentially connected in series with several
H1、H2、H3.Several energy-storage batteries H1、H2、H3The capacitor of voltage source converter 15 is connected in parallel after being sequentially connected in series.
As other interchangeable embodiments, the accumulator 16 of the utility model embodiment can also include filter
The harmonic component in electric current is exported for filtered voltage source inverter 15.In conclusion the energy storage electricity for passing through different implementations
Road 16 can realize the fluctuation for stabilizing power grid output voltage, and then improve the stability and power grid output electric energy of electric operation of power networks
Quality.
As shown in Figure 1, the sub-synchronous oscillation in the utility model embodiment inhibits device, further includes: subsynchronous signal mentions
Take equipment 12 and control equipment, wherein subsynchronous data extraction device 12, connection signal acquire equipment 11, for joining from electricity
Subsynchronous signal is extracted in number information.Subsynchronous data extraction device 12 herein can be signal extraction in the prior art
Device.Specifically, according to the first electric current ISWith the second electric current ILDetermine subsynchronous current signal.Specifically, subsynchronous signal extraction
Equipment 12 is to the second electric current I acquired from signal collecting device 11LIt carries out d-q coordinate transform and obtains the under d-q coordinate system
Three electric current ILdWith the 4th electric current ILq, obtain the leading-out terminal of bus rod 22 the first electric current I on the transmission lineSWith the first phase
Position θp, extract third electric current ILdSubsynchronous electric current ILd1With the 4th electric current ILqSubsynchronous electric current ILq2。
Subsynchronous data extraction device 12 further includes filter and phase compensator, wherein its connection signal of phase compensator
Equipment is acquired, for being filtered to the subsynchronous signal that signal collecting device extracts.Phase compensator connects filter,
For carrying out phase compensation and correction to the subsynchronous signal after filter filtering.Phase compensator herein is the prior art
In the phase compensator that is commonly used, internal phase compensation parameter be it is pre-set, due to subsynchronous signal with it is defeated
Actual subsynchronous signal can have certain offset in electric line, and its phase offset of different frequency is different, in order to make
It is more accurate to obtain acquired subsynchronous signal, inhibits subsynchronous signal ideal, therefore needs phase compensator.Specifically,
As shown in figure 4, subsynchronous data extraction device 12 acquires the three-phase current I on transmission line of electricity to signal collecting device 11La1、ILb1
And ILc1It is coordinately transformed, the second electric current I acquired in signal collecting device 11LIt carries out d-q coordinate transform and obtains d-q coordinate
Third electric current I under systemLdWith the 4th electric current ILq, obtain the leading-out terminal of bus rod 22 the first electric current I on the transmission lineS
With first phase θp, first phase θpIt is obtained by phaselocked loop, finally according to the third electric current I after coordinate transformLdWith the 4th electricity
Flow iLqExtract third electric current ILdSubsynchronous electric current ILd1With the 4th electric current ILqSubsynchronous electric current ILq2, similarly and to the first electricity
Pressure Us carries out d-q coordinate transform and obtains the second voltage U under d-q coordinate systemsq1With tertiary voltage Usq2, to third electric current ILdWith
Four electric current ILqIt carries out phase compensation and corrects and obtain the subsynchronous electric current I of phase compensationLd1Subsynchronous electric current ILq2。
Equipment 13 is controlled, the input terminal of subsynchronous data extraction device 12 and voltage source converter 15, root are separately connected
Start pulse signal is generated according to the subsynchronous signal that subsynchronous data extraction device 12 is extracted, controls 16 burning voltage of accumulator
The output voltage of source inverter 15.It controls equipment 13 and mainly applies controller in the prior art, for generating trigger pulse letter
Number, it controls the IGBT device inside voltage source converter 15 and is connected to obtain and the consistent output electricity of control 13 valve control of equipment instruction
Pressure, control equipment 13 generate start pulse signal according to the subsynchronous signal that subsynchronous data extraction device 12 is extracted, pass through arteries and veins
Wide modulation control voltage source converter 15 is connected so that the output voltage of voltage source converter 15, which changes, inhibits subsynchronous signal.This
The control equipment 13 at place is mainly used for carrying out the on-off of the IGBT device inside voltage source converter 15 control change voltage source
The size of the output voltage of inverter 15 inhibits the output end of device 1 to infuse eventually by series transformer 14 to sub-synchronous oscillation
Enter the output voltage for inhibiting subsynchronous signal.
Embodiment 2
The utility model embodiment provides a kind of power grid output system, as shown in figure 5, including subsynchronous in embodiment 1
Vibration suppression device 1, further includes: generation of electricity by new energy base 21, bus rod 22, step-up transformer 2；Wherein sub-synchronous oscillation presses down
Device 1 processed includes signal collecting device 11, subsynchronous data extraction device 12, series transformer 14,15 and of voltage source converter
Control equipment 13.Signal collecting device 11, subsynchronous data extraction device 12, series transformer 14,15 and of voltage source converter
Control equipment 13 may be located on the transmission line of electricity where the leading-out terminal of bus rod 22, the primary side of series transformer 14
It is connect respectively with the leading-out terminal of bus rod 22 with by terminal circuit 20.Sub-synchronous oscillation in the present embodiment inhibits the defeated of device 1
Outlet is generally connect with by terminal circuit 20.Sub-synchronous oscillation in the present embodiment inhibits the structure of device 1 also relatively simple, passes through
Signal collecting device 11, subsynchronous data extraction device 12, series transformer 14, voltage source converter 15 and control equipment 13
The subsynchronous signal on transmission line of electricity can quickly and effectively be inhibited.
Generation of electricity by new energy base 21 comprising the input terminal of power grid is arranged in multiple generation of electricity by new energy stations, is used for power grid
Electric energy is provided.Generation of electricity by new energy base 21 herein can be wind power station or photo-voltaic power generation station, and wherein wind power station can
Think direct-drive wind power generation or double-fed wind generating.New energy is unconventional energy resource, refers to the various energy except traditional energy
Form, refer to just start develop and use or actively study, refer to the energy for needing to be promoted, as solar energy, geothermal energy, wind energy,
Ocean energy, biomass energy and nuclear fusion energy etc., and wind energy and solar energy are mainly applied in generation of electricity by new energy base 21 in the present embodiment,
Wind energy and solar energy can be converted to electric energy power supply network respectively and largely used by wind power station and photo-voltaic power generation station, be more clear
The clean and environmentally friendly energy.Traditional power generation base is generally generated electricity using steam turbine generator, and a kind of mode of thermal power generation is belonged to.
On transmission line of electricity where the leading-out terminal of bus rod 22 in the present embodiment, can directly it be acquired by signal collecting device 11
Subsynchronous signal on grid side transmission line of electricity, therefore its acquisition mode is more convenient, and sub-synchronous oscillation is combined to inhibit device
In accumulator 16 can effectively stabilize the voltage fluctuation of power grid transmission line road, thus improve operation of power networks stability and
Improve the quality of power grid output electric energy.Such as: the generation of electricity by new energy base 21 in the present embodiment is wind power station, multiple wind-force
Power station is more dispersed, and frequency range is larger, so that fan operation state is affected by wind speed, if using tradition
The subsynchronous information that is acquired between blower shafting of thermoelectricity mode it is more difficult, therefore generation of electricity by new energy base is not only environmentally friendly, also
Subsynchronous data extraction device 12 can be made, which to extract subsynchronous signal, to suffer restraints.
In Fig. 5, bus rod 22 connects generation of electricity by new energy base 21, for exporting multiple generation of electricity by new energy stations
Electric energy collected.Bus rod 22 concentrates the electric energy for collecting multiple generation of electricity by new energy station outputs, and it is more to be conducive to concentrated restraining
A generation of electricity by new energy station is grid-connected collect after the sub-synchronous oscillation phenomenon that occurs, cost can be greatly reduced.Step-up transformer 23 is used
It boosts in the voltage exported to bus rod 22.The leading-out terminal of the primary side connection bus rod 22 of step-up transformer 23,
Its secondary side connection signal acquires equipment 11.Certainly, the connection type of the primary side of step-up transformer 23 and secondary side can be mutual
It changes, i.e., the primary side connection signal of step-up transformer 23 acquires equipment 11, and the secondary side of step-up transformer 23 connects bus rod
22 leading-out terminal.
As shown in figure 5, being sent out for the generation of electricity by new energy base 21 in power grid output system in the present embodiment using multiple wind-force
During power station is generated electricity, the Simulation of SAR power image figure of power grid output system when sub-synchronous oscillation occurs, in Fig. 5, when 6.5s
The sub-synchronous oscillation put into the present embodiment inhibits device 1, upper from line power measurement, it is apparent that subsynchronous in generation
When oscillation, power is in the state of self-sustained oscillation, after the sub-synchronous oscillation in investment the present embodiment inhibits device 1, the vibration of power
It swings and is quickly stabilized, restore to stablize.
Obviously, the above embodiments are merely examples for clarifying the description, and does not limit the embodiments.It is right
For those of ordinary skill in the art, can also make on the basis of the above description it is other it is various forms of variation or
It changes.There is no necessity and possibility to exhaust all the enbodiments.And it is extended from this it is obvious variation or
It changes among the protection scope created still in the utility model.
Claims (10)
1. a kind of sub-synchronous oscillation inhibits device characterized by comprising
Signal collecting device connects the leading-out terminal of bus rod, for acquiring the electrical parameter information on transmission line of electricity, the electricity
Parameter information includes current parameters or voltage parameter or power parameter；
Series transformer, primary side are separately connected the leading-out terminal of the bus rod and by terminal circuits；
Voltage source converter, output end are connected in parallel the secondary side of the series transformer, for being believed according to the electrical parameter
Breath carries out the change of current；
Accumulator is connected in parallel the voltage source converter, for by storing the stable electric power on the transmission line of electricity
The output voltage of the voltage source converter.
2. sub-synchronous oscillation according to claim 1 inhibits device, which is characterized in that the accumulator includes successively going here and there
Join the first capacitor and the first inductance of connection.
3. sub-synchronous oscillation according to claim 2 inhibits device, which is characterized in that the accumulator includes successively going here and there
Join the second capacitor, the second inductance and the controllable switch of connection.
4. sub-synchronous oscillation according to claim 3 inhibits device, which is characterized in that the accumulator includes several
The energy-storage battery being sequentially connected in series.
5. sub-synchronous oscillation according to claim 1 inhibits device, which is characterized in that further include:
Subsynchronous data extraction device connects the signal collecting device, secondary same for extracting from the electrical parameter information
Walk signal；
Equipment is controlled, the input terminal of the subsynchronous data extraction device and the voltage source converter is separately connected, according to
The subsynchronous signal that the subsynchronous data extraction device is extracted generates start pulse signal, and it is steady to control the accumulator
The output voltage of the fixed voltage source converter.
6. sub-synchronous oscillation according to claim 1 inhibits device, which is characterized in that the voltage source converter is full-bridge
Type structure or semi-bridge type structure.
7. sub-synchronous oscillation according to claim 1 inhibits device, the signal collecting device include voltage transformer or
One or more of current transformer or power transformer.
8. sub-synchronous oscillation according to claim 5 inhibits device, the subsynchronous data extraction device further include:
Filter connects the signal collecting device, and the subsynchronous signal for extracting to the signal collecting device carries out
Filtering,
Phase compensator connects the filter, for carrying out phase to the subsynchronous signal after the filter filtering
Position compensation and correction.
9. a kind of power grid output system, which is characterized in that inhibit dress including the described in any item sub-synchronous oscillations of claim 1-8
It sets, further includes:
Generation of electricity by new energy base comprising the input terminal of power grid is arranged in multiple generation of electricity by new energy stations, for mentioning to the power grid
For electric energy；
The bus rod connects the generation of electricity by new energy base, the electricity for exporting the multiple generation of electricity by new energy station
It can be carried out and collect；
Step-up transformer, the voltage for exporting to the bus rod boost.
10. power grid output system according to claim 9, which is characterized in that the generation of electricity by new energy station is wind-power electricity generation
It stands or photo-voltaic power generation station.
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