CN108832616A - Sub-synchronous oscillation inhibits device and new energy transmission system - Google Patents
Sub-synchronous oscillation inhibits device and new energy transmission system Download PDFInfo
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- CN108832616A CN108832616A CN201810432842.2A CN201810432842A CN108832616A CN 108832616 A CN108832616 A CN 108832616A CN 201810432842 A CN201810432842 A CN 201810432842A CN 108832616 A CN108832616 A CN 108832616A
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- 230000010355 oscillation Effects 0.000 title claims abstract description 92
- 230000005540 biological transmission Effects 0.000 title claims abstract description 55
- 230000005611 electricity Effects 0.000 claims abstract description 38
- 230000005684 electric field Effects 0.000 claims description 19
- 238000000605 extraction Methods 0.000 claims description 14
- 230000006641 stabilisation Effects 0.000 abstract description 13
- 230000005764 inhibitory process Effects 0.000 abstract description 6
- 238000011105 stabilization Methods 0.000 abstract description 4
- 239000003990 capacitor Substances 0.000 description 6
- 238000010276 construction Methods 0.000 description 4
- 238000010586 diagram Methods 0.000 description 3
- 238000000034 method Methods 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000000465 moulding Methods 0.000 description 2
- 230000007423 decrease Effects 0.000 description 1
- 239000004744 fabric Substances 0.000 description 1
- 230000002401 inhibitory effect Effects 0.000 description 1
- 230000001360 synchronised effect Effects 0.000 description 1
- 239000002699 waste material Substances 0.000 description 1
Classifications
-
- 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
-
- 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
- H02J3/002—Flicker reduction, e.g. compensation of flicker introduced by non-linear load
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- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Supply And Distribution Of Alternating Current (AREA)
Abstract
The invention discloses a kind of sub-synchronous oscillations to inhibit device and new energy transmission system, wherein sub-synchronous oscillation inhibits the device to include：Reactor is arranged between the transmission line of electricity and ground terminal of the leading-out terminal of bus rod；Switching switch, is arranged between reactor and ground terminal；Sub-synchronous oscillation inhibits equipment, is arranged between the transmission line of electricity of the leading-out terminal of switching switch and bus rod；The state of leading-out terminal of the switching switch for controlling reactor and sub-synchronous oscillation inhibition equipment investment bus rod.When by switching switch so that the leading-out terminal of bus rod needs reactor to carry out systems stabilisation voltage, reactor is put into bus rod leading-out terminal；When sub-synchronous oscillation occurs, sub-synchronous oscillation is inhibited to the leading-out terminal of equipment investment bus rod, the sub-synchronous oscillation of transmission system is inhibited.The stabilization that system voltage can not only be taken into account, can also inhibit sub-synchronous oscillation, and reactor resource in system is maximumlly utilized, reduces costs.
Description
Technical field
The present invention relates to power electronics and electrical equipment technical fields, and in particular to inhibits device to a kind of sub-synchronous oscillation
And new energy transmission system.
Background technique
The scale of power grid is growing, and complexity is continuously increased with factors such as the quickenings of electricity marketization process to system
Security and stability, flexibility requirement be continuously improved.System stability is improved, increases transmitting capacity of the electric wire netting, improve idle point
The key technical problem that cloth and voltage support will be faced as China's power grid.
It is in the prior art the voltage in systems stabilisation, in the leading-out terminal of the bus rod of distributed new, for example,
Collect in station, often uses reactor systems stabilisation voltage, but with the increase of grid-connected new energy electric field quantity, power grid system
Load of uniting increases, and the utilization rate of reactor can decline.With the increase of grid-connected new energy electric field quantity, new energy electric field is brought
Sub-synchronous oscillation problem can become and influence the stable key factor of transmission system, also, the reduction of reactor utilization rate can increase
The grid-connected sub-synchronous oscillation risk of big new energy electric field.It therefore, need to also going out in bus rod with the increase of new energy electric field
Line end increases sub-synchronous oscillation and inhibits device.Sub-synchronous oscillation is directly built in the leading-out terminal of bus rod and inhibits device, not only
Increasing newly-built equipment cost includes cost of floor space, construction cost etc., and will lead to former reactor and leave unused, and causes device resource
Waste.
Therefore, when a large amount of new energy electric fields are grid-connected, cost how is reduced while stablizing transmission system to be become urgently
The technical issues of solution.
Summary of the invention
The technical problem to be solved in the present invention is that when a large amount of new energy electric fields are grid-connected, while stablizing transmission system
Reduce cost at.
The embodiment of the invention provides the confluences that distributed new electric field is arranged in a kind of sub-synchronous oscillation inhibition device
The leading-out terminal of bus, including：Reactor is arranged between the transmission line of electricity and ground terminal of the leading-out terminal of bus rod；Switching is opened
It closes, is arranged between reactor and ground terminal；Sub-synchronous oscillation inhibits equipment, and the outlet of switching switch and bus rod is arranged in
Between the transmission line of electricity at end；Switching switch inhibits the outlet of equipment investment bus rod for controlling reactor and sub-synchronous oscillation
The state at end.
Optionally, sub-synchronous oscillation inhibition equipment includes：Signal extraction module, connect with transmission line of electricity, defeated for extracting
Sub-synchronous oscillation signal in electric line；Inverter is connect with transmission line of electricity, for exporting the subsynchronous vibration inhibited in transmission line of electricity
The subsynchronous impedance signal swung；Control module is connect with signal extraction module and inverter respectively, for according to sub-synchronous oscillation
Signal controls inverter and exports subsynchronous impedance signal.
Optionally, signal extraction module 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, switching switch includes：Moved end is connect with ground terminal；First stationary contact, connect with reactor；Second is quiet
Contact inhibits equipment to connect with sub-synchronous oscillation.
Optionally, control module, which is also used to control moved end according to sub-synchronous oscillation signal, is connected to the second stationary contact.
Optionally, signal extraction module is also used to extract the virtual value of the subsynchronous voltage/current signals of transmission line of electricity；Control
Molding block be also used to by the virtual value of subsynchronous voltage/current signals and predeterminated voltage/current value ratio compared with, subsynchronous voltage/
When the virtual value of current signal is greater than predeterminated voltage/current value, control module control moved end is connected to the second stationary contact.
Optionally, switching switch includes：One in single-pole double-throw switch (SPDT), breaker, disconnecting switch and electronic power switch
Or it is multiple.
Optionally, inverter includes：Two level converters, diode clamp bit-type inverter, fly across electricity at three-level converter
It is any one in appearance type inverter, modularization multi-level converter, H bridge cascade multi-level converter and voltage source converter
Kind.
According to second aspect, the embodiment of the invention provides a kind of new energy transmission systems, including：Multiple new energy of distribution
Source electric field；Bus rod, for collecting the transmission line of electricity of each distributed new electric field leading-out terminal；Such as above-described embodiment first
The sub-synchronous oscillation of aspect any one inhibits device, and the leading-out terminal of bus rod is arranged in.
The embodiment of the invention provides a kind of sub-synchronous oscillations to inhibit device and new energy transmission system, reactor with connect
Setting switching switch between ground terminal, is added sub-synchronous oscillation and inhibits equipment, by switching switching, so that bus rod goes out
When line end needs reactor to carry out systems stabilisation voltage, reactor is put into the leading-out terminal of bus rod, systems stabilisation voltage；
When sub-synchronous oscillation occurs, by the switching of switching switch, so that sub-synchronous oscillation inhibits the outlet of equipment investment bus rod
End, inhibits the sub-synchronous oscillation of transmission system.The stabilization of system voltage can be not only taken into account, it can also be to subsynchronous vibration
It swings and is inhibited, while reactor resource in system maximumlly is utilized, reduce costs, improve the utilization rate of equipment,
Save the investment that construction inhibits sub-synchronous oscillation to inhibit device.Reduce the cost of stable transmission system.
Detailed description of the invention
Fig. 1 shows the schematic diagram that sub-synchronous oscillation in the embodiment of the present invention inhibits device；
Fig. 2 shows the schematic diagrames that sub-synchronous oscillation another in the embodiment of the present invention inhibits device；
Fig. 3 shows the schematic diagram of new energy transmission system in the embodiment of the present invention.
Specific embodiment
Technical solution of the present invention is clearly and completely described below in conjunction with attached drawing, it is clear that described implementation
Example is a part of the embodiment of the present invention, instead of all the embodiments.Based on the embodiments of the present invention, ordinary skill
Personnel's every other embodiment obtained without making creative work, shall fall within the protection scope of the present invention.
In addition, term " first ", " second " etc. are used for descriptive purposes only and cannot be understood as indicating or suggesting relative importance.
The embodiment of the invention provides a kind of sub-synchronous oscillations to inhibit device, which is that can take into account system voltage to stablize
Inhibit with sub-synchronous oscillation, the leading-out terminal of the bus rod of distributed new electric field is set, as shown in Figure 1, the device packet
It includes：
Reactor 10 is arranged between the transmission line of electricity 1 of the leading-out terminal of bus rod and ground terminal 2；Switch switch 30, if
It sets between reactor 10 and ground terminal 2；Sub-synchronous oscillation inhibit equipment 20, be arranged in switching switch 30 and bus rod out
Between the transmission line of electricity 1 of line end；Switching switch 30 inhibits the investment confluence of equipment 20 for controlling reactor 10 and sub-synchronous oscillation
The state of the leading-out terminal of bus.In the present embodiment, alleged reactor 10 can be three-phase reactor, specifically, reactor can
To be connected by multiple reactors or be composed in parallel by multiple reactors.
In the particular embodiment, the setting switching switch 30 between reactor 10 and ground terminal 2, is added sub-synchronous oscillation
Inhibit equipment 20, switched by switching switch 30, so that bus rod leading-out terminal needs reactor 10 to carry out systems stabilisation voltage
When, the leading-out terminal by the investment of reactor 10 to bus rod, systems stabilisation voltage；When sub-synchronous oscillation occurs, pass through switching
The switching of switch 30, so that sub-synchronous oscillation inhibits the leading-out terminal of the investment bus rod of equipment 20.It is set in sub-synchronous oscillation inhibition
Control module control sub-synchronous oscillation in standby 20 inhibits equipment 20 to inhibit the sub-synchronous oscillation in transmission system.Not only
The stabilization of system voltage can be taken into account, sub-synchronous oscillation can also be inhibited, going out for bus rod is maximumlly utilized
The device resource of line end, reduces costs, and improves the utilization rate of equipment, saves construction and sub-synchronous oscillation is inhibited to inhibit device
Investment.Reduce the cost of stable transmission system.
In an alternate embodiment of the invention, as shown in Fig. 2, sub-synchronous oscillation inhibition equipment 20 may include：Signal extraction module
21, it is connect with transmission line of electricity 1, for extracting sub-synchronous oscillation signal on transmission line of electricity 1；Signal extraction module in the present embodiment
21 may include：Signal acquisition unit 211, for acquiring the electric signal in transmission line of electricity 1.Wherein, signal acquisition unit 211 can
To include at least one of voltage transformer, current transformer and power transformer.Acquire the electric current letter in transmission line of electricity 1
Number, at least one of voltage signal or power signal.Since the frequency range of new energy electric field to be generated electricity is wider, frequency is not
It is single, therefore the sub-synchronous oscillation signal band generated is wider, is handled using filter 212 electric signal, obtains secondary same
Walk oscillator signal.Phase compensation unit 213, for carrying out phase compensation to sub-synchronous oscillation signal.Specifically, by taking electric current as an example
It is illustrated, collects the three-phase current on transmission line of electricity 1, obtain the electric current under d-q coordinate system by coordinate transform, pass through lock
Phase ring obtains the phase of the electric current on transmission line of electricity 1, according to the subsynchronous current signal of current draw after coordinate transform and to secondary
Phase compensation is carried out with current signal, finally obtains the sub-synchronous oscillation signal on transmission line of electricity 1.
Inverter 22, connect with transmission line of electricity, for exporting the subsynchronous resistance for inhibiting the sub-synchronous oscillation in transmission line of electricity
Antinoise signal.In the present embodiment, inverter 22 may include that two level converters, three-level converter, diode clamp bit-type are changed
Flow device, striding capacitance type inverter, modularization multi-level converter, H bridge cascade multi-level converter and the voltage-source type change of current
At least one of device.It in the present embodiment, may include for being mentioned for the power electronic devices in inverter in inverter 22
For the capacitor unit of DC voltage, which may include a capacitor, is composed in series by multiple capacitors
Capacitor group or the capacitor group composed in parallel by multiple capacitors.Control module 23, respectively with signal extraction module 21 and change
It flows device 22 to connect, exports subsynchronous impedance signal for controlling inverter 22 according to sub-synchronous oscillation signal.
In the particular embodiment, sub-synchronous oscillation signal may include subsynchronous electric current d axis signal and subsynchronous electric current q
Axis signal generates pulse switch signal according to sub-synchronous oscillation signal in control module 23 and then controls the electric power in inverter 22
Electronic switch, for example, the opening and closing of IGBT, and then obtain subsynchronous impedance signal.
In an alternate embodiment of the invention, switching switch 30 may include single-pole double-throw switch (SPDT), breaker, disconnecting switch and electric power
Any switch or any two switches of parallel connection in electronic switch；With switch off current and the normally closed performance for closing operation.With
Switching switch 30 is is illustrated for controllable commutator, specifically, as shown in Fig. 2, switching switch 30 may include：It is dynamic
End 31, connect with ground terminal 2；First stationary contact 32, connect with reactor 10；Second stationary contact 33 inhibits with sub-synchronous oscillation
Equipment 20 connects.Specifically, sub-synchronous oscillation inhibits equipment when the moved end 31 and the first stationary contact 32 that switch switch 30 contact
20 cut out, and sub-synchronous oscillation inhibits function to exit, and play reactor function, stablize to system voltage；When switching switch 30
Moved end 31 and the second stationary contact 33 when contacting, sub-synchronous oscillation inhibit equipment 20 to put into the leading-out terminal of bus rod, reactor
10 cut out, and control module controls sub-synchronous oscillation and equipment 20 is inhibited to put into, and carry out sub-synchronous oscillation inhibition.In specific embodiment
In, the electric signal that signal extraction module 21 is extracted on transmission line of electricity 1 includes sub-synchronous oscillation signal, and control module 23 is according to secondary
The moved end 31 of synchronized oscillation signal control switching switch 30 switches to the second stationary contact 33, makes sub-synchronous oscillation that equipment 20 be inhibited to throw
Enter.In the present embodiment, signal extraction module 21 is also used to extract the voltage value of transmission line of electricity 1, and control module 23 can also wrap
Voltage comparator is included, for compared with preset voltage value, when voltage value is greater than preset voltage value, controlling by the voltage value of extraction
The moved end 31 of the control switching switch 30 of molding block 23 is connected to the first stationary contact 32, makes sub-synchronous oscillation that equipment 20 be inhibited to cut off,
Put into reactor 10.
The embodiment of the invention also provides a kind of new energy transmission systems, as shown in figure 3, the transmission system may include：
Multiple distributed new electric fields 100；The leading-out terminal 200 of bus rod, bus rod, for collecting each distributed new
The transmission line of electricity of electric field leading-out terminal；If the sub-synchronous oscillation of above-described embodiment any one inhibits device 300, setting is female in confluence
The leading-out terminal of line 200.
Inhibit include transformer 400 between device 300 in multiple new energy electric fields 100 and sub-synchronous oscillation,
In the present embodiment, transformer 400 can be step-up transformer.In the present embodiment, new energy electric field may include wind power plant and
Photovoltaic DC field.
The setting switching switch between the reactor and ground terminal 2 of bus rod leading-out terminal, is added sub-synchronous oscillation and inhibits
Equipment, by switching switching, when so that the leading-out terminal of bus rod needing reactor to carry out systems stabilisation voltage, by reactance
Device is put into the leading-out terminal of bus rod, systems stabilisation voltage；When sub-synchronous oscillation occurs, the switching switched by switching,
So that sub-synchronous oscillation inhibits the leading-out terminal of equipment investment bus rod, the sub-synchronous oscillation of transmission system is inhibited.No
The stabilization that system voltage can only be taken into account, can also inhibit sub-synchronous oscillation, and reactance in system is maximumlly utilized
Device resource, reduces costs, and improves the utilization rate of equipment, saves the investment that construction inhibits sub-synchronous oscillation to inhibit device.Drop
The low cost of stable transmission system.
Although the embodiments of the invention are described in conjunction with the attached drawings, but those skilled in the art can not depart from this hair
Various modifications and variations can be made in the case where bright spirit and scope, and such modifications and variations are each fallen within by appended claims
Within limited range.
Claims (9)
1. a kind of sub-synchronous oscillation inhibits device, the leading-out terminal of the bus rod of distributed new electric field, feature are set
It is, including：
Reactor is arranged between the transmission line of electricity and ground terminal of the leading-out terminal of the bus rod；
Switching switch, is arranged between the reactor and the ground terminal；
Sub-synchronous oscillation inhibit equipment, be arranged in it is described switching switch and the bus rod leading-out terminal transmission line of electricity it
Between；
The switching switch inhibits bus rod described in equipment investment for controlling the reactor and the sub-synchronous oscillation
The state of leading-out terminal.
2. sub-synchronous oscillation as described in claim 1 inhibits device, which is characterized in that the sub-synchronous oscillation inhibits equipment packet
It includes：
Signal extraction module is connect with the transmission line of electricity, for extracting sub-synchronous oscillation signal on the transmission line of electricity；
Inverter is connect with the transmission line of electricity, inhibits the subsynchronous of the sub-synchronous oscillation in the transmission line of electricity for exporting
Impedance signal；
Control module is connect with the signal extraction module and the inverter respectively, for being believed according to the sub-synchronous oscillation
Number control inverter exports the subsynchronous impedance signal.
3. sub-synchronous oscillation as claimed in claim 2 inhibits device, which is characterized in that the signal extraction module includes：
Signal acquisition unit is connect with the transmission line of electricity, for acquiring the electric signal in 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.
4. sub-synchronous oscillation as claimed in any one of claims 1-3 inhibits device, which is characterized in that the switching switch packet
It includes：
Moved end is connect with the ground terminal；
First stationary contact is connect with the reactor；
Second stationary contact inhibits equipment to connect with the sub-synchronous oscillation.
5. sub-synchronous oscillation as claimed in claim 4 inhibits device, which is characterized in that
The control module, which is also used to control the moved end according to the sub-synchronous oscillation signal, is connected to second stationary contact.
6. sub-synchronous oscillation as claimed in claim 4 inhibits device, which is characterized in that
The signal extraction module is also used to extract the virtual value of the subsynchronous voltage/current signals of the transmission line of electricity；
The control module be also used to by the virtual value of the subsynchronous voltage/current signals and predeterminated voltage/current value ratio compared with,
When the virtual value of the subsynchronous voltage/current signals is greater than predeterminated voltage/current value, the control module control is described dynamic
End is connected to second stationary contact.
7. sub-synchronous oscillation as claimed in claim 4 inhibits device, which is characterized in that the switching, which switchs, includes：
It is one or more in single-pole double-throw switch (SPDT), breaker, disconnecting switch and electronic power switch.
8. sub-synchronous oscillation as claimed in claim 2 inhibits device, which is characterized in that the inverter includes：Two level change
Flow device, three-level converter, diode clamp bit-type inverter, striding capacitance type inverter, modularization multi-level converter, H bridge
Any one in cascade multi-level converter and voltage source converter.
9. a kind of new energy transmission system, which is characterized in that including：
Multiple distributed new electric fields；
Bus rod, for collecting the transmission line of electricity of each distributed new electric field leading-out terminal；
Sub-synchronous oscillation as described in claim 1-8 any one inhibits device, and the leading-out terminal of the bus rod is arranged in.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201810432842.2A CN108832616B (en) | 2018-05-08 | 2018-05-08 | Subsynchronous oscillation suppression device and new energy power transmission system |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810432842.2A CN108832616B (en) | 2018-05-08 | 2018-05-08 | Subsynchronous oscillation suppression device and new energy power transmission system |
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| CN108832616B CN108832616B (en) | 2024-03-12 |
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Address after: 102209 18 Riverside Avenue, Changping District science and Technology City, Beijing Applicant after: GLOBAL ENERGY INTERCONNECTION RESEARCH INSTITUTE Co.,Ltd. Applicant after: ECONOMIC AND TECHNICAL RESEARCH INSTITUTE OF STATE GRID XINJIANG ELECTRIC POWER Co.,Ltd. Applicant after: STATE GRID CORPORATION OF CHINA Address before: 102209 18 Riverside Avenue, Changping District science and Technology City, Beijing Applicant before: GLOBAL ENERGY INTERCONNECTION RESEARCH INSTITUTE Co.,Ltd. Applicant before: ECONOMIC AND TECHNICAL RESEARCH INSTITUTE OF STATE GRID XINJIANG ELECTRIC POWER Co.,Ltd. Applicant before: State Grid Corporation of China |
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