CN108631334A - A kind of sub-synchronous oscillation restraining device and power grid output system - Google Patents
A kind of sub-synchronous oscillation restraining device and power grid output system Download PDFInfo
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- CN108631334A CN108631334A CN201810431309.4A CN201810431309A CN108631334A CN 108631334 A CN108631334 A CN 108631334A CN 201810431309 A CN201810431309 A CN 201810431309A CN 108631334 A CN108631334 A CN 108631334A
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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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Abstract
The present invention discloses a kind of sub-synchronous oscillation restraining device and power grid output system, wherein sub-synchronous oscillation restraining device include：Signal collecting device connects the leading-out terminal of bus rod, and for acquiring the electrical parameter information on transmission line of electricity, electrical parameter information includes current parameters or voltage parameter or power parameter；Shunt transformer, primary side are separately connected the leading-out terminal of bus rod and by terminal circuits；Voltage source converter, its output end is connected in parallel the primary side of shunt transformer, for carrying out the change of current, accumulator according to electrical parameter information, it is connected in parallel voltage source converter, for the output voltage by storing the stable electric power voltage source converter on transmission line of electricity.The present invention 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 present invention relates to power electronic equipment technical fields, and in particular to a kind of sub-synchronous oscillation restraining device and power grid are defeated
Go out system.
Background technology
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 is sent 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 is happened at Zhangjiakou Guyuan area, is had occurred so far much by wind turbine after this area's string is mended and put into operation within 2010
Sub-synchronous oscillation problem caused by group and string are mended, causes grid equipment operation exception and a large amount of wind turbine 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 caused 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 relatively low so that the electricity at capacitance both ends in reactive power compensation circuit
Larger fluctuation is given birth in pressure, the larger capacitance of capacitance can be generally chosen in reactive power compensation circuit stabilizes sub-synchronous oscillation and draw
Play the larger voltage fluctuation of electrical network access point, but capacitance it is larger capacitance cost it is larger, and then lead to entire sub-synchronous oscillation
The cost of restraining device increases.
Invention content
Therefore, technical problems to be solved of the embodiment of the present invention be it is in the prior art be it is in the prior art time same
Step oscillation restriction circuit chooses the larger capacitance of capacitance and stabilizes the voltage fluctuation that sub-synchronous oscillation causes electrical network access point larger, but
It is that the larger capacitance cost of capacitance is larger, and then the cost of entire sub-synchronous oscillation restraining device is caused to increase.
For this purpose, an embodiment of the present invention provides following technical solutions：
The embodiment of the present invention provides a kind of sub-synchronous oscillation restraining device, including：
Signal collecting device connects the leading-out terminal of bus rod, for acquiring the electrical parameter information on transmission line of electricity, institute
It includes current parameters or voltage parameter or power parameter to state electrical parameter information；
Shunt transformer, primary side be separately connected the leading-out terminal of the bus rod with it is described by terminal circuit；
Voltage source converter, output end are connected in parallel the primary side of the shunt 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 capacitance and the first inductance being sequentially connected in series.
Optionally, the accumulator includes the second capacitance, the second inductance and controllable switch being sequentially connected in series.
Optionally, the accumulator includes the energy-storage battery that several are sequentially connected in series.
Optionally, the sub-synchronous oscillation restraining device further includes：
Subsynchronous data extraction device connects the signal collecting device, for being extracted from the electrical parameter information
Subsynchronous signal；
Control device is separately connected the input terminal of the subsynchronous data extraction device and the voltage source converter,
Start pulse signal is generated according to the subsynchronous signal of the subsynchronous data extraction device extraction, 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 one kind in voltage transformer or current transformer or power transformer
Or it is several.
Optionally, the subsynchronous data extraction device further includes：
Filter connects the signal collecting device, the subsynchronous signal for being extracted 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 sub-synchronous oscillation restraining device, the control device further include：Pulse width modulator connects the phase
Compensator, for generating the pulse triggering signal according to the phase compensation parameter.
The embodiment of the present invention provides a kind of power grid output system, including the sub-synchronous oscillation restraining device, further includes：
Generation of electricity by new energy base comprising the input terminal in 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, primary side connect the leading-out terminal of the bus rod, and secondary side connects the signal acquisition
Equipment.
Optionally, the generation of electricity by new energy station is wind power station or photo-voltaic power generation station.
Technical solution of the embodiment of the present invention, has the following advantages that：
A kind of sub-synchronous oscillation restraining device of present invention offer and power grid output system, wherein sub-synchronous oscillation restraining device
Including：Signal collecting device connects the leading-out terminal of bus rod, for acquiring the electrical parameter information on transmission line of electricity, electricity ginseng
Number information includes current parameters or voltage parameter or power parameter；Shunt transformer, primary side are separately connected bus rod
Leading-out terminal with by terminal circuit；Voltage source converter, output end are connected in parallel the primary side of shunt transformer, for being joined according to electricity
Number information carries out the change of current；Accumulator is connected in parallel voltage source converter, for steady by storing the electric energy on transmission line of electricity
The output voltage of constant voltage source transverter.The present invention is connected in parallel voltage source converter by setting accumulator can stabilize electricity
The output voltage of net access point fluctuates and the fluctuation of the output voltage of voltage source converter, is conducive to the stabilization for improving operation of power networks
Property and power grid output electric energy stability.
Description of the drawings
It, below will be to specific in order to illustrate more clearly of the specific embodiment of the invention or technical solution in the prior art
Embodiment or attached drawing needed to be used in the description of the prior art are briefly described, it should be apparent that, in being described below
Attached drawing is some embodiments of the present invention, for those of ordinary skill in the art, before not making the creative labor
It puts, other drawings may also be obtained based on these drawings.
Fig. 1 is the structural schematic diagram of sub-synchronous oscillation restraining device in the embodiment of the present invention 1；
Fig. 2A is the first circuit diagram of voltage source converter in the embodiment of the present invention 1；
Fig. 2 B are the second circuit schematic diagram of voltage source converter in the embodiment of the present invention 1；
Fig. 3 A are the first circuit diagram of accumulator in the embodiment of the present invention 1；
Fig. 3 B are the second circuit schematic diagram of accumulator in the embodiment of the present invention 1；
Fig. 3 C are the tertiary circuit schematic diagram of accumulator in the embodiment of the present invention 1；
Fig. 3 D are the 4th circuit diagram of accumulator in the embodiment of the present invention 1；
Fig. 4 is the schematic diagram that control device carries out subsynchronous signal extraction and phase compensation in the embodiment of the present invention 1；
Fig. 5 is the structural schematic diagram of power grid output system in the embodiment of the present invention 2；
Fig. 6 is the Simulation of SAR power image figure that sub-synchronous oscillation restraining device inhibits subsynchronous signal in the embodiment of the present invention 2.
Reference numeral：
1- sub-synchronous oscillation restraining devices；11- signal collecting devices；The subsynchronous data extraction devices of 12-；
13- control devices；14- shunt transformers；15- voltage source converters；
16- accumulators；21- generations of electricity by new energy base；22- bus rods；
23- step-up transformers.
Specific implementation mode
The technical solution of the embodiment of the present invention is clearly and completely described below in conjunction with attached drawing, it is clear that described
Embodiment be a part of the embodiment of the present invention, instead of all the embodiments.Based on the embodiments of the present invention, this field is general
The every other embodiment that logical technical staff is obtained without making creative work belongs to what the present invention protected
Range.
In the description of the embodiment of the present invention, it should be noted that term "center", "upper", "lower", "left", "right",
The orientation or positional relationship of the instructions such as "vertical", "horizontal", "inner", "outside" is to be based on the orientation or positional relationship shown in the drawings,
It is merely for convenience of the description embodiment of the present invention and simplifies to describe, not indicating or implying the indicated device or element must have
There is specific orientation, with specific azimuth configuration and operation, therefore is not considered as limiting the invention.In addition, term " the
One ", " second ", " third " are used for description purposes only, and are not understood to indicate or imply relative importance.
In the description of the embodiment of the present invention, it should be noted that unless otherwise clearly defined and limited, term " peace
Dress ", " connected ", " connection " shall be understood in a broad sense, for example, it may be being fixedly connected, may be a detachable connection, or integrally
Connection；It can be mechanical connection, can also be electrical connection；Can be directly connected, can also indirectly connected through an intermediary,
It can also be the connection inside two elements, can be wirelessly connected, can also be wired connection.For the common skill of this field
For art personnel, the concrete meaning of above-mentioned term in the present invention can be understood with concrete condition.
As long as in addition, technical characteristic involved in invention described below different embodiments non-structure each other
It can be combined with each other at conflict.
Embodiment 1
The embodiment of the present invention provides a kind of sub-synchronous oscillation restraining device, as shown in Figure 1, including：Signal is respectively included to adopt
Collect equipment 11, shunt transformer 14, voltage source converter 15 and accumulator 16.Wherein, signal collecting device 11, parallel pressure change
Device 14, voltage source converter 15 and accumulator 16 may be located on the transmission line of electricity where the leading-out terminal of bus rod 22
On.
Specifically, signal collecting device 11 are arranged on the transmission line of electricity being connect 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 electrical parameter information so that the total subsynchronous signal of wind power plant can be obtained and carry out concentrated restraining.11 institute of signal collecting device
The electrical parameter information of acquisition is mainly the first voltage U on transmission line of electricitySWith the first electric current IS, the leading-out terminal of bus rod 22 with
The second electric current I on transmission line of electricity between voltage source converter 15L, utilize voltage transformer acquisition first voltage US, utilize
Current transformer acquires the first electric current IS, 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 subsynchronous in the present embodiment is shaken
Swinging restraining device can be carried out effectively inhibiting to the subsynchronous signal of different frequency scope.
Shunt transformer 14, primary side a are separately connected the leading-out terminal of bus rod 22 and by terminal circuits 20.In Fig. 1,
It can be seen that 14 primary side of shunt transformer is a, secondary side b, the secondary side b of shunt transformer 14 are connected in parallel voltage source and change
Device 15 is flowed, the primary side b of shunt transformer 14 is connected in parallel the input terminal of bus rod 22 respectively and by terminal circuit 20, parallel connection becomes
The primary side a of depressor 14 is also connected with signal collecting device 11, and shunt transformer 14 forms shunt peaking circuit with by terminal circuit 20,
14 one side of shunt transformer may be implemented impedance matching, on the other hand realize for the defeated of sub-synchronous oscillation restraining device 1
Outlet injection inhibits the current parameters of subsynchronous signal.
Voltage source converter 15, output end are connected in parallel the secondary side b of the shunt transformer, for according to the electricity
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 bridges
Transverter, as shown in Figure 2 A, H bridge transverters include four IGBT device T1、T2、T3、T4And it is connected in parallel between H bridge transverters
Third capacitance C3Bridge-type structure is formed, as other interchangeable embodiments, the voltage source converter 15 in the present embodiment
Can also be semi-bridge type structure, as shown in Figure 2 B, voltage source converter 15 includes two IGBT device T5、T6Be connected in parallel on voltage
The 4th capacitance C between source transverter 154Form semi-bridge type structure.The main function of voltage source converter 15 is exactly defeated to power grid
Electric current in electric line carries out the change of current.Specifically, voltage source converter 15 may be implemented by or off direct current is inverse
Become the alternating current of some frequency or variable frequency, voltage source converter 15 is finally made under the action of pulse width is modulated
Output voltage, which changes, to be realized and Power Exchange is occurred to inhibit subsynchronous signal by terminal circuit 20.
Accumulator 16 is connected in parallel voltage source converter 15, for by storing the stable electric power on 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 relatively low so that the voltage at the capacitor both ends of power grid output voltage and voltage source converter 15 occurs 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 work(support for grid power transmission circuit.Such as：When
When the output power in generation of electricity by new energy base is more 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, that is, realizes the change of current, accumulator 16 can be given to carry out at this time
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 absorb output when generation of electricity by new energy base is connected to the grid
Power is fluctuated with stabilizing the power grid output voltage caused by sub-synchronous oscillation, so as to effectively improve the stabilization of operation of power networks
Property and power grid output electric energy quality.
Accumulator 16 in the embodiment of the present invention, as shown in Figure 3B, including the first capacitance C for being sequentially connected in series1With
One inductance L1, the first capacitance C1With the first inductance L1The capacitor afterwards with voltage source converter 15 is sequentially connected in series to be connected in parallel.
As other interchangeable embodiments, as shown in Figure 3 C, accumulator 16 can also include the second electricity being sequentially connected in series
Hold C2, the second inductance L2With controllable switch S1, the second capacitance C2, the second inductance L2With controllable switch S1It is after being sequentially connected in series and electric
The capacitor of Source Con-verters 15 is connected in parallel, wherein controllable switch S1It can be as needed so that accumulator accesses electricity in due course
Road, such as：If voltage fluctuation caused by the sub-synchronous oscillation of power grid transmission line road is not especially severe, can select to turn off
Controllable switch S1Accumulator 16 is not allowed to access circuit, if voltage fluctuation caused by the sub-synchronous oscillation of power grid transmission line road
It is very serious, conducting controllable switch S can be selected1So that accumulator 16 accesses circuit and stabilizes the voltage fluctuation.As it is other can
The embodiment of replacement, as shown in Figure 3D, accumulator 16 can be with energy-storage battery H that several are sequentially connected in series1、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 embodiment of the present invention can also be used for including filter
Harmonic component in 15 output current of filtered voltage source transverter.In conclusion the accumulator 16 for passing through different realization methods
It can realize the fluctuation for stabilizing power grid output voltage, and then improve the matter of the stability and power grid output electric energy of electric operation of power networks
Amount.
As shown in Figure 1, the sub-synchronous oscillation restraining device in the embodiment of the present invention, further includes：Subsynchronous signal extraction is set
Standby 12 and control device, wherein subsynchronous data extraction device 12, connection signal collecting device 11, for believing from electrical parameter
Subsynchronous signal is extracted in breath.Subsynchronous data extraction device 12 herein can be dector in the prior art.Tool
Body, according to the first electric current ISWith the second electric current ILDetermine subsynchronous current signal.Specifically, subsynchronous data extraction device 12
To the second electric current I acquired from signal collecting device 11LIt carries out d-q coordinate transforms and obtains the third electric current under d-q coordinate systems
ILdWith the 4th electric current ILq, the first electric current I where obtaining the leading-out terminal of bus rod 22 on transmission line of electricitySWith first phase θp,
Extract third electric current ILdSubsynchronous electric current ILd1With the 4th electric current ILqSubsynchronous electric current ILq2.Subsynchronous data extraction device
12 further include filter and phase compensator, wherein its connection signal collecting device of phase compensator, for being set to signal acquisition
The subsynchronous signal of standby extraction is filtered.Phase compensator connects filter, for subsynchronous after filter filtering
Signal carries out phase compensation and correction.Phase compensator herein is the phase compensator being commonly used in the prior art, in
The phase compensation parameter in portion is pre-set, since subsynchronous signal and actual subsynchronous signal on transmission line of electricity can be deposited
In certain offset, and its phase offset of different frequency is different, in order to enable acquired subsynchronous signal is more accurate,
Inhibit subsynchronous signal ideal, therefore needs phase compensator.Phase compensator is mainly to subsynchronous data extraction device 12
The subsynchronous electric current I extractedLd1With subsynchronous electric current ILq2It carries out phase compensation and obtains phase compensation parameter.Specifically, such as Fig. 4
Shown, subsynchronous data extraction device 12 acquires signal collecting device 11 the three-phase current I on transmission line of electricityLa1、ILb1And ILc1
It is coordinately transformed, the second electric current I acquired in signal collecting device 11LD-q coordinate transforms are carried out to obtain under d-q coordinate systems
Third electric current ILdWith the 4th electric current ILq, the first electric current I where obtaining the leading-out terminal of bus rod 22 on transmission line of electricitySWith first
Phase thetap, first phase θpIt is obtained by phaselocked loop, finally according to the third electric current I after coordinate transformLdWith the 4th electric current iLqIt carries
Take third electric current ILdSubsynchronous electric current ILd1With the 4th electric current ILqSubsynchronous electric current ILq2, similarly and to first voltage Us into
Row d-q coordinate transforms obtain the second voltage U under d-q coordinate systemssq1With tertiary voltage Usq2, to third electric current ILdWith the 4th electric current
ILqIt carries out phase compensation and corrects and obtain the subsynchronous electric current I of phase compensationLd1Subsynchronous electric current ILq2。
Control device 13 is separately connected the input terminal of subsynchronous data extraction device 12 and voltage source converter 15, root
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 transverter 15.Control device 13 mainly applies controller in the prior art, for generating trigger pulse letter
Number, the IGBT device inside control voltage source converter 15 is connected to obtain instructs consistent output electricity with 13 valve control of control circuit
Pressure.Control device 13 generates start pulse signal according to the subsynchronous signal that subsynchronous data extraction device 12 is extracted, and passes through arteries and veins
IGBT device inside wide modulation control voltage source converter 15 is connected so that the output voltage of voltage source converter 15 changes suppression
Make subsynchronous signal.Inhibit subsynchronous to the injection of the output end of sub-synchronous oscillation restraining device 1 eventually by shunt transformer 14
The output current of signal.
Embodiment 2
The embodiment of the present invention provides a kind of power grid output system, as shown in figure 5, including the sub-synchronous oscillation in embodiment 1
Restraining device 1 further includes：Generation of electricity by new energy base 21, bus rod 22, wherein bus rod 22, step-up transformer 23；Wherein
Sub-synchronous oscillation restraining device 1 includes signal collecting device 11, subsynchronous data extraction device 12, shunt transformer 14, voltage
Source transverter 15 and control device 13.Signal collecting device 11, subsynchronous data extraction device 12, shunt transformer 14, voltage
Source transverter 15 and control device 13 may be located on the transmission line of electricity where the leading-out terminal of bus rod 22, and series connection becomes
The primary side of depressor 14 is connect with the leading-out terminal of bus rod 22 with by terminal circuit 20 respectively.Sub-synchronous oscillation in the present embodiment
The structure of restraining device 1 is also relatively simple, passes through signal collecting device 11, subsynchronous data extraction device 12, shunt transformer
14, voltage source converter 15 and control device 13 can quickly and effectively inhibit the subsynchronous signal on transmission line of electricity.
Generation of electricity by new energy base 21 comprising the input terminal in 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 in the present embodiment, electricity can directly be acquired by signal collecting device 11
Subsynchronous signal on net side transmission line of electricity, therefore its acquisition mode is more convenient, and combine in sub-synchronous oscillation restraining device
Accumulator 16 can effectively stabilize the voltage fluctuation of power grid transmission line road, to improve the stability of operation of power networks and carry
The quality of high power grid output electric energy.Such as：Generation of electricity by new energy base 21 in the present embodiment is wind power station, multiple wind-force hairs
Power station more disperses, and frequency range is larger so that fan operation state is affected by wind speed, if using traditional
The subsynchronous information that thermoelectricity mode is acquired between wind turbine shafting is more difficult, therefore generation of electricity by new energy base is not only environmentally friendly, may be used also
It will not suffer restraints so that subsynchronous data extraction device 12 extracts subsynchronous signal.
In Figure 5, bus rod 22, connection 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 led
It is used to boost to the voltage that bus rod 22 exports, primary side connects the leading-out terminal of bus rod 22, secondary side
Connection signal collecting device 11.Certainly, the primary side of step-up transformer 23 and the connection type of secondary side can be interchanged, that is, boost
The primary side connection signal collecting device 11 of transformer 23, the outlet of the secondary side connection bus rod 22 of step-up transformer 23
End.
As shown in fig. 6, being sent out using multiple wind-force for the generation of electricity by new energy base 21 in power grid output system in the present embodiment
During power station is generated electricity, the Simulation of SAR power image figure of power grid output system when sub-synchronous oscillation occurs, in figure 6, when 6.5s
The sub-synchronous oscillation restraining device 1 in the present embodiment is put into, is measured from line power upper, it is apparent that subsynchronous in generation
When oscillation, power is in the state of self-sustained oscillation, and after the sub-synchronous oscillation restraining device 1 in putting into the present embodiment, power shakes
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 still within the protection scope of the invention.
Claims (10)
1. a kind of sub-synchronous oscillation restraining device, which is characterized in that including：
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；
Shunt transformer, primary side be separately connected the leading-out terminal of the bus rod with it is described by terminal circuit；
Voltage source converter, output end are connected in parallel the primary side of the shunt 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 restraining device according to claim 1, which is characterized in that the accumulator includes going here and there successively
Join the first capacitance and the first inductance of connection.
3. sub-synchronous oscillation restraining device according to claim 2, which is characterized in that the accumulator includes going here and there successively
Join the second capacitance, the second inductance and the controllable switch of connection.
4. sub-synchronous oscillation restraining device according to claim 3, which is characterized in that the accumulator includes several
The energy-storage battery being sequentially connected in series.
5. sub-synchronous oscillation restraining device according to claim 1, which is characterized in that further include：
Subsynchronous data extraction device connects the signal collecting device, secondary same for being extracted from the electrical parameter information
Walk signal；
Control device is separately connected the input terminal of the subsynchronous data extraction device and the voltage source converter, according to
The subsynchronous signal of the subsynchronous data extraction device extraction 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 restraining device according to claim 1, which is characterized in that the voltage source converter is full-bridge
Type structure or semi-bridge type structure.
7. sub-synchronous oscillation restraining device according to claim 1, which is characterized in that the signal collecting device includes electricity
Press mutual inductor or one or more of current transformer or power transformer.
8. sub-synchronous oscillation restraining device according to claim 5, which is characterized in that the subsynchronous data extraction device
Further include：
Filter connects the signal collecting device, and the subsynchronous signal for being extracted 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 to fill including claim 1-8 any one of them sub-synchronous oscillations
It sets, further includes：
Generation of electricity by new energy base comprising the input terminal in power grid is arranged in multiple generation of electricity by new energy stations, for being carried 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 collected；
Step-up transformer, the voltage for being exported 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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