CN108832616B - Subsynchronous oscillation suppression device and new energy power transmission system - Google Patents
Subsynchronous oscillation suppression device and new energy power transmission system Download PDFInfo
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- CN108832616B CN108832616B CN201810432842.2A CN201810432842A CN108832616B CN 108832616 B CN108832616 B CN 108832616B CN 201810432842 A CN201810432842 A CN 201810432842A CN 108832616 B CN108832616 B CN 108832616B
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- subsynchronous oscillation
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- transmission line
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- 230000010355 oscillation Effects 0.000 title claims abstract description 90
- 230000005540 biological transmission Effects 0.000 title claims abstract description 56
- 230000001629 suppression Effects 0.000 title claims abstract description 50
- 230000005684 electric field Effects 0.000 claims description 21
- 238000000605 extraction Methods 0.000 claims description 14
- 239000003990 capacitor Substances 0.000 claims description 9
- 238000001914 filtration Methods 0.000 claims description 2
- 230000002401 inhibitory effect Effects 0.000 claims description 2
- 230000000452 restraining effect Effects 0.000 description 6
- 230000001360 synchronised effect Effects 0.000 description 5
- 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
- 230000009466 transformation Effects 0.000 description 2
- 238000010276 construction Methods 0.000 description 1
- 230000006641 stabilisation Effects 0.000 description 1
- 238000011105 stabilization Methods 0.000 description 1
- 230000000087 stabilizing 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
Abstract
The invention discloses a subsynchronous oscillation suppression device and a new energy power transmission system, wherein the subsynchronous oscillation suppression device comprises: the reactor is arranged between the power transmission line at the outlet end of the bus bar and the grounding end; the change-over switch is arranged between the reactor and the grounding end; subsynchronous oscillation suppression equipment arranged between the change-over switch and the power transmission line at the outlet end of the bus bar; the change-over switch is used for controlling the state that the reactor and the subsynchronous oscillation suppression equipment are put into the outlet end of the bus bar. When the reactor is required to stabilize the system voltage at the outlet end of the bus bar through the change-over switch, the reactor is put into the outlet end of the bus bar; when subsynchronous oscillation occurs, subsynchronous oscillation suppression equipment is put into the outlet end of the bus bar to suppress subsynchronous oscillation of the power transmission system. The system voltage stability can be considered, subsynchronous oscillation can be restrained, reactor resources in the system are utilized to the maximum extent, and the cost is reduced.
Description
Technical Field
The invention relates to the technical field of power electronics and power equipment, in particular to a subsynchronous oscillation suppression device and a new energy power transmission system.
Background
The scale of the power grid is increasingly enlarged, the complexity is continuously increased, the power market process is accelerated, and the like, so that the requirements on the safety stability and the flexibility of the system are continuously improved. Improving system stability, increasing power transmission capacity of the power grid, and improving reactive power distribution and voltage support become key technical problems faced by the power grid in China.
In the prior art, for stabilizing the voltage in the system, at the outlet end of a bus bar of a distributed new energy, for example, in a collecting station, a reactor is often adopted to stabilize the system voltage, but as the number of electric fields of the new energy which are connected in a grid is increased, the load of a grid system is increased, and the utilization rate of the reactor is reduced. With the increase of the number of the new energy electric fields connected with the grid, the problem of subsynchronous oscillation caused by the new energy electric fields can become an important factor affecting the stability of the power transmission system, and the reduction of the utilization rate of the reactor can increase the subsynchronous oscillation risk of the new energy electric fields connected with the grid. Therefore, with the increase of the new energy electric field, a subsynchronous oscillation suppression device is also required to be added at the outlet end of the bus bar. The subsynchronous oscillation suppression device is directly built at the outlet end of the bus bar, so that the cost of newly built equipment including occupied land cost, construction cost and the like is increased, the original reactor is idle, and the waste of equipment resources is caused.
Therefore, how to stabilize the power transmission system and reduce the cost when a large amount of new energy electric fields are connected in grid becomes a technical problem to be solved urgently.
Disclosure of Invention
The invention aims to solve the technical problem that when a large amount of new energy electric fields are connected, the cost is reduced while a power transmission system is stabilized.
The embodiment of the invention provides a subsynchronous oscillation suppression device which is arranged at an outlet end of a bus bar of a distributed new energy electric field, and comprises the following components: the reactor is arranged between the power transmission line at the outlet end of the bus bar and the grounding end; the change-over switch is arranged between the reactor and the grounding end; subsynchronous oscillation suppression equipment arranged between the change-over switch and the power transmission line at the outlet end of the bus bar; the change-over switch is used for controlling the state that the reactor and the subsynchronous oscillation suppression equipment are put into the outlet end of the bus bar.
Optionally, the subsynchronous oscillation suppression device includes: the signal extraction module is connected with the power transmission line and is used for extracting the last synchronous oscillation signal of the power transmission line; the converter is connected with the power transmission line and is used for outputting a subsynchronous impedance signal for inhibiting subsynchronous oscillation in the power transmission line; and the control module is respectively connected with the signal extraction module and the current converter and is used for controlling the current converter to output a subsynchronous impedance signal according to the subsynchronous oscillation signal.
Optionally, the signal extraction module includes: the signal acquisition unit is connected with the power transmission line and is used for acquiring electric signals in the power transmission line; the filter is connected with the signal acquisition unit and is used for filtering the electric signal to obtain a subsynchronous oscillation signal; and the phase compensation unit is connected with the filter and is used for carrying out phase compensation on the subsynchronous oscillation signals.
Optionally, the changeover switch includes: the movable end is connected with the grounding end; the first stationary contact is connected with the reactor; and the second stationary contact is connected with the subsynchronous oscillation suppression device.
Optionally, the control module is further configured to control the moving end to be connected to the second stationary contact according to the subsynchronous oscillation signal.
Optionally, the signal extraction module is further configured to extract an effective value of a subsynchronous voltage/current signal of the power transmission line; the control module is also used for comparing the effective value of the secondary synchronous voltage/current signal with a preset voltage/current value, and when the effective value of the secondary synchronous voltage/current signal is larger than the preset voltage/current value, the control module controls the movable end to be connected to the second stationary contact.
Optionally, the changeover switch includes: one or more of a single pole double throw switch, a circuit breaker, a disconnector, and a power electronic switch.
Optionally, the converter includes: any one of a two-level converter, a three-level converter, a diode clamping type converter, a flying capacitor type converter, a modularized multi-level converter, an H-bridge cascading type multi-level converter and a voltage source type converter.
According to a second aspect, an embodiment of the present invention provides a new energy transmission system, including: a plurality of distributed new energy electric fields; the bus bar is used for collecting the power transmission lines at the outlet end of each distributed new energy electric field; the subsynchronous oscillation suppression device according to any one of the first aspect of the embodiments described above is provided at the outlet end of the bus bar.
The embodiment of the invention provides a subsynchronous oscillation suppression device and a new energy power transmission system, wherein a change-over switch is arranged between a reactor and a grounding end, subsynchronous oscillation suppression equipment is added, and the change-over switch is used for switching, so that when an outgoing end of a bus needs the reactor to stabilize the system voltage, the reactor is put into the outgoing end of the bus to stabilize the system voltage; when subsynchronous oscillation occurs, subsynchronous oscillation suppression equipment is put into the bus outlet end through switching of a switching switch, and subsynchronous oscillation of the power transmission system is suppressed. The system voltage stability can be considered, subsynchronous oscillation can be restrained, meanwhile, reactor resources in the system are utilized to the greatest extent, the cost is reduced, the utilization rate of equipment is improved, and investment for constructing and restraining the subsynchronous oscillation restraining device is saved. The cost of the stable power transmission system is reduced.
Drawings
FIG. 1 is a schematic diagram of a subsynchronous oscillation suppression device according to an embodiment of the present invention;
FIG. 2 is a schematic diagram of another synchronous oscillation suppression device according to an embodiment of the present invention;
fig. 3 shows a schematic diagram of a new energy transmission system in an embodiment of the present invention.
Detailed Description
The following description of the embodiments of the present invention will be made apparent and fully in view of the accompanying drawings, in which some, but not all embodiments of the invention are shown. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention. Furthermore, the terms "first," "second," and the like are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.
The embodiment of the invention provides a subsynchronous oscillation suppression device, which can realize both system voltage stabilization and subsynchronous oscillation suppression, is arranged at an outlet end of a bus bar of a distributed new energy electric field, as shown in fig. 1, and comprises:
a reactor 10 provided between the power transmission line 1 and the ground 2 at the outlet end of the bus bar; a change-over switch 30 provided between the reactor 10 and the ground terminal 2; a subsynchronous oscillation suppression device 20 provided between the changeover switch 30 and the power transmission line 1 at the outlet end of the bus bar; the changeover switch 30 is used to control the state in which the reactor 10 and the subsynchronous oscillation suppression device 20 are put into the outlet end of the bus bar. In this embodiment, the reactor 10 may be referred to as a three-phase reactor, and specifically, the reactor may be composed of a plurality of reactors connected in series or a plurality of reactors connected in parallel.
In a specific embodiment, a change-over switch 30 is arranged between the reactor 10 and the grounding terminal 2, a subsynchronous oscillation suppression device 20 is added, and the change-over switch 30 is used for switching, so that when the reactor 10 is required to stabilize the system voltage at the outlet terminal of the bus bar, the reactor 10 is put into the outlet terminal of the bus bar to stabilize the system voltage; when the subsynchronous oscillation occurs, the subsynchronous oscillation suppression device 20 is put into the outlet terminal of the bus bar by switching of the switch 30. The control module in the subsynchronous oscillation suppression device 20 controls the subsynchronous oscillation suppression device 20 to suppress subsynchronous oscillation in the power transmission system. The system voltage stability can be considered, subsynchronous oscillation can be restrained, equipment resources at the outlet end of the bus bar are utilized to the maximum extent, the cost is reduced, the utilization rate of equipment is improved, and investment for constructing and restraining the subsynchronous oscillation restraining device is saved. The cost of the stable power transmission system is reduced.
In an alternative embodiment, as shown in fig. 2, the subsynchronous oscillation suppression device 20 may comprise: the signal extraction module 21 is connected with the power transmission line 1 and is used for extracting the last synchronous oscillation signal of the power transmission line 1; the signal extraction module 21 may include: the signal acquisition unit 211 is configured to acquire an electrical signal in the power transmission line 1. The signal acquisition unit 211 may include at least one of a voltage transformer, a current transformer, and a power transformer. At least one of a current signal, a voltage signal or a power signal in the power transmission line 1 is collected. Because the generated frequency range of the new energy electric field is wider and the frequency is not uniform, the frequency band of the generated subsynchronous oscillation signal is wider, and the filter 212 is adopted to process the electric signal to obtain the subsynchronous oscillation signal. A phase compensation unit 213 for performing phase compensation on the subsynchronous oscillation signal. Specifically, taking current as an example for explanation, three-phase current on the power transmission line 1 is collected, current under a d-q coordinate system is obtained through coordinate transformation, the phase of the current on the power transmission line 1 is obtained through a phase-locked loop, a subsynchronous current signal is extracted according to the current after the coordinate transformation, and phase compensation is carried out on the subsynchronous current signal, so that a subsynchronous oscillation signal on the power transmission line 1 is finally obtained.
The inverter 22 is connected to the power transmission line and outputs a subsynchronous impedance signal for suppressing subsynchronous oscillation in the power transmission line. In this embodiment, the converter 22 may include at least one of a two-level converter, a three-level converter, a diode clamp converter, a flying capacitor converter, a modular multi-level converter, an H-bridge cascade multi-level converter, and a voltage source converter. In this embodiment, the converter 22 may comprise a capacitor unit for providing a dc voltage to the power electronics in the converter, which may comprise one capacitor, a capacitor bank consisting of a plurality of capacitors connected in series, or a capacitor bank consisting of a plurality of capacitors connected in parallel. The control module 23 is connected with the signal extraction module 21 and the converter 22 respectively, and is used for controlling the converter 22 to output a subsynchronous impedance signal according to the subsynchronous oscillation signal.
In a specific embodiment, the subsynchronous oscillation signal may include a subsynchronous current d-axis signal and a subsynchronous current q-axis signal, and the control module 23 generates a pulse switching signal according to the subsynchronous oscillation signal to control the power electronic switch in the inverter 22, for example, the on/off of the IGBT, so as to obtain a subsynchronous impedance signal.
In alternative embodiments, the transfer switch 30 may comprise any one of a single pole double throw switch, a circuit breaker, a disconnector, and a power electronic switch, or any two switches in parallel; the device has the performance of current turn-off and normally closed operation. Taking the change-over switch 30 as a controllable double-throw switch for illustration, specifically, as shown in fig. 2, the change-over switch 30 may include: a movable terminal 31 connected to the ground terminal 2; a first stationary contact 32 connected to the reactor 10; the second stationary contact 33 is connected to the subsynchronous oscillation suppression device 20. Specifically, when the movable end 31 of the change-over switch 30 contacts the first stationary contact 32, the subsynchronous oscillation suppression device 20 cuts out, the subsynchronous oscillation suppression function exits, the reactor function is exerted, and the system voltage is stabilized; when the movable end 31 of the change-over switch 30 is in contact with the second stationary contact 33, the subsynchronous oscillation suppression device 20 is put into the outlet end of the bus bar, the reactor 10 is cut out, and the control module controls the subsynchronous oscillation suppression device 20 to be put into, and subsynchronous oscillation suppression is performed. In a specific embodiment, the electrical signal extracted by the signal extraction module 21 on the power transmission line 1 includes a subsynchronous oscillation signal, and the control module 23 controls the moving end 31 of the switch 30 to switch to the second stationary contact 33 according to the subsynchronous oscillation signal, so that the subsynchronous oscillation suppression device 20 is put into operation. In this embodiment, the signal extraction module 21 is further configured to extract a voltage value of the power transmission line 1, and the control module 23 may further include a voltage comparator, where the voltage comparator is configured to compare the extracted voltage value with a preset voltage value, and when the voltage value is greater than the preset voltage value, the control module 23 controls the movable end 31 of the switch 30 to be connected to the first stationary contact 32, so that the subsynchronous oscillation suppression device 20 is cut off, and the reactor 10 is put into operation.
The embodiment of the invention also provides a new energy power transmission system, as shown in fig. 3, which may include: a plurality of distributed new energy electric fields 100; the outlet end 200 of the bus bar is used for collecting the power transmission lines of the outlet ends of the electric fields of the distributed new energy sources; the subsynchronous oscillation suppression device 300 according to any of the above embodiments is provided at the outgoing line end of the bus bar 200.
A transformer 400 may be further included between the plurality of new energy electric fields 100 and the subsynchronous oscillation suppression device 300, and in this embodiment, the transformer 400 may be a step-up transformer. In this embodiment, the new energy electric field may include a wind electric field and a photovoltaic electric field.
A change-over switch is arranged between a reactor at the outlet end of the bus and the grounding end 2, subsynchronous oscillation suppression equipment is added, and the change-over switch is used for switching, so that when the outlet end of the bus needs the reactor to stabilize the system voltage, the reactor is put into the outlet end of the bus to stabilize the system voltage; when subsynchronous oscillation occurs, subsynchronous oscillation suppression equipment is put into the wire outlet end of the bus bar through switching of the switch, and subsynchronous oscillation of the power transmission system is suppressed. The system voltage stability can be considered, subsynchronous oscillation can be restrained, reactor resources in the system are utilized to the maximum extent, the cost is reduced, the utilization rate of equipment is improved, and the investment for constructing and restraining the subsynchronous oscillation restraining device is saved. The cost of the stable power transmission system is reduced.
Although embodiments of the present invention have been described in connection with the accompanying drawings, various modifications and variations may be made by those skilled in the art without departing from the spirit and scope of the invention, and such modifications and variations fall within the scope of the invention as defined by the appended claims.
Claims (4)
1. A subsynchronous oscillation suppression device provided at an outlet end of a bus bar of a distributed new energy electric field, characterized by comprising:
the reactor is arranged between the power transmission line at the outlet end of the bus bar and the grounding end;
a change-over switch disposed between the reactor and the ground, the change-over switch comprising: the movable end is connected with the grounding end; the first stationary contact is connected with the reactor; the second stationary contact is connected with the subsynchronous oscillation suppression device;
a subsynchronous oscillation suppression device provided between the change-over switch and a power transmission line at an outlet end of the bus bar, the subsynchronous oscillation suppression device comprising: the system comprises a signal extraction module, an inverter and a control module, wherein the signal extraction module is connected with a power transmission line and is used for extracting a subsynchronous oscillation signal on the power transmission line; the converter is connected with the power transmission line and is used for outputting a subsynchronous impedance signal for inhibiting subsynchronous oscillation in the power transmission line; the control module is respectively connected with the signal extraction module and the converter, and is used for controlling the converter to output the subsynchronous impedance signal according to the subsynchronous oscillation signal;
the signal extraction module includes: the device comprises a signal acquisition unit, a filter and a phase compensation unit; the signal acquisition unit is connected with the power transmission line and is used for acquiring electric signals in the power transmission line; the filter is connected with the signal acquisition unit and is used for filtering the electric signal to obtain a subsynchronous oscillation signal; the phase compensation unit is connected with the filter and is used for carrying out phase compensation on the subsynchronous oscillation signals;
the change-over switch is used for controlling the states of the reactor and the subsynchronous oscillation suppression equipment which are put into the outlet end of the bus bar; the control module is also used for controlling the movable end to be connected to the second stationary contact according to the subsynchronous oscillation signal;
the signal extraction module is also used for extracting the effective value of the subsynchronous voltage/current signal of the power transmission line;
the control module is further configured to compare the effective value of the secondary synchronization voltage/current signal with a preset voltage/current value, and when the effective value of the secondary synchronization voltage/current signal is greater than the preset voltage/current value, the control module controls the movable end to be connected to the second stationary contact.
2. The subsynchronous oscillation suppression device of claim 1, wherein said change-over switch comprises:
one or more of a single pole double throw switch, a circuit breaker, a disconnector, and a power electronic switch.
3. The subsynchronous oscillation suppression device of claim 1, wherein said inverter comprises: any one of a two-level converter, a three-level converter, a diode clamping type converter, a flying capacitor type converter, a modularized multi-level converter, an H-bridge cascading type multi-level converter and a voltage source type converter.
4. The utility model provides a new forms of energy transmission system which characterized in that includes:
a plurality of distributed new energy electric fields;
the bus bar is used for collecting the power transmission lines at the outlet ends of the distributed new energy electric fields;
the subsynchronous oscillation suppression device according to any one of claims 1-3, provided at an outlet end of the bus bar.
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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 |
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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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| CN108832616A CN108832616A (en) | 2018-11-16 |
| CN108832616B true CN108832616B (en) | 2024-03-12 |
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Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN201528206U (en) * | 2009-10-29 | 2010-07-14 | 西安西微电力设备有限公司 | Harmonic wave suppressed type high voltage dynamic reactive power automatic compensation device |
| CN105515020A (en) * | 2016-01-19 | 2016-04-20 | 思源清能电气电子有限公司 | Sub-synchronous oscillation suppression control method and system based on SVG |
| CN106130038A (en) * | 2016-06-24 | 2016-11-16 | 全球能源互联网研究院 | The grid side sub-synchronous oscillation restraining device that a kind of new forms of energy base goes out through string by-carriage |
| CN206250775U (en) * | 2016-11-02 | 2017-06-13 | 哈尔滨理工大学 | Wind power plant sub-synchronous oscillation restraining device containing serial supplementary line |
| CN208674881U (en) * | 2018-05-08 | 2019-03-29 | 全球能源互联网研究院有限公司 | Sub-synchronous oscillation inhibits device and new energy transmission system |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2013037846A1 (en) * | 2011-09-12 | 2013-03-21 | Alstom Technology Ltd | Sub-synchronous oscillation damping by shunt facts apparatus |
-
2018
- 2018-05-08 CN CN201810432842.2A patent/CN108832616B/en active Active
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN201528206U (en) * | 2009-10-29 | 2010-07-14 | 西安西微电力设备有限公司 | Harmonic wave suppressed type high voltage dynamic reactive power automatic compensation device |
| CN105515020A (en) * | 2016-01-19 | 2016-04-20 | 思源清能电气电子有限公司 | Sub-synchronous oscillation suppression control method and system based on SVG |
| CN106130038A (en) * | 2016-06-24 | 2016-11-16 | 全球能源互联网研究院 | The grid side sub-synchronous oscillation restraining device that a kind of new forms of energy base goes out through string by-carriage |
| CN206250775U (en) * | 2016-11-02 | 2017-06-13 | 哈尔滨理工大学 | Wind power plant sub-synchronous oscillation restraining device containing serial supplementary line |
| CN208674881U (en) * | 2018-05-08 | 2019-03-29 | 全球能源互联网研究院有限公司 | Sub-synchronous oscillation inhibits device and new energy transmission system |
Non-Patent Citations (4)
| Title |
|---|
| A novel SSR-damping scheme based on imbalance operation of SSSC;Xiangning Xiao等;《 2010 International Conference on Power System Technology》;1-5 * |
| FACTS装置抑制次同步振荡的研究综述;熊萍;李兴源;徐大鹏;李伟;;现代电力(第04期);6-11页 * |
| SVC安装地点对次同步振荡抑制效果的影响;卢绍强;王腾;宋战慧;;东北电力技术(第03期);12-16+20页 * |
| SVC抑制次同步谐振的仿真研究;郭昆丽 等;《国外电子测量技术》;第第37卷卷(第第3期期);6-12页 * |
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