CN208608734U - A kind of utility power quality control device of transmission line of electricity - Google Patents
A kind of utility power quality control device of transmission line of electricity Download PDFInfo
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- CN208608734U CN208608734U CN201821481769.XU CN201821481769U CN208608734U CN 208608734 U CN208608734 U CN 208608734U CN 201821481769 U CN201821481769 U CN 201821481769U CN 208608734 U CN208608734 U CN 208608734U
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- current transformer
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- electricity
- transmission line
- switch
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E40/00—Technologies for an efficient electrical power generation, transmission or distribution
- Y02E40/30—Reactive power compensation
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Abstract
The utility model provides a kind of utility power quality control device of transmission line of electricity, which includes: the first current transformer, the second current transformer, high-speed switch and controlling terminal；First current transformer and the second current transformer connect back-to-back, and the controlling terminal for being built-in with preset control strategy is connect with the first current transformer, the second current transformer, high-speed switch respectively；The output end of second current transformer and the bus of main electricity connect, and the output end of the first current transformer and the bus of backup power source connect；After controlling terminal is used to detect that Voltage Drop to occur for the bus of main electricity, by controlling state, the mode of the mode of the first current transformer and the second current transformer of high-speed switch, so that main electricity disconnects, and carrying out voltage by backup power source temporarily will compensation.The utility model can carry out voltage to transmission line of electricity without energy storage device temporarily will compensation.
Description
Technical field
The utility model relates to power quality control technology field more particularly to a kind of utility power quality controls of transmission line of electricity
Device.
Background technique
For electric energy as a kind of energy economical and practical, easy to clean, oneself becomes the important base of economic development and people's lives
Plinth.As power electronic equipment is using more and more extensive, various non-linear, impacts, fluctuation and asymmetric load be a large amount of
Increase, these problems will cause Voltage unbalance, voltage dip, harmonic wave, power factor are relatively low, negative-sequence current content is big etc.
Power quality problem.
Usually occurs big variation (such as powerful device starts) meeting suddenly by power grid, the failure of transformation facility or load
Cause transmission line of electricity that voltage dip occurs, prior art processing voltage dip is usually to be solved using voltage sag compensation device
Certainly problem, however, existing voltage sag compensation device such as series connection accumulation compensation class device, energy storage in parallel compensation class device and not
Uninterruptible power class device is both needed to additional energy storage device, causes the framework cost of transmission line of electricity and maintenance cost higher.
Therefore it provides a kind of can carry out voltage temporarily by the device of compensation as this field skill without energy storage to transmission line of electricity
Art personnel technical problem urgently to be resolved.
Utility model content
The utility model discloses a kind of utility power quality control devices of transmission line of electricity, can be to defeated without energy storage device
Electric line carries out voltage temporarily will compensation.
The utility model provides a kind of utility power quality control device of transmission line of electricity, comprising: the first current transformer, second become
Flow device, high-speed switch and controlling terminal；
First current transformer and second current transformer connect back-to-back, are built-in with the control of preset control strategy
Terminal is connect with first current transformer, second current transformer, the high-speed switch respectively；
The bus of the output end of second current transformer and main electricity connects, the output end of first current transformer with
The bus of backup power source connects；
After the controlling terminal is used to detect that Voltage Drop to occur for the bus of the main electricity, by described in control
The mode of the state of high-speed switch, the mode of first current transformer and second current transformer, so that the main electricity
It disconnects, and carrying out voltage by the backup power source temporarily will compensation.
Preferably, the controlling terminal be also used to the bus of the main electricity, the backup power source bus just
Often when work, according to the preset control strategy by second current transformer, first current transformer respectively to the main confession
The bus of power supply, the backup power source bus load current carry out harmonic wave, idle and negative sequence compensation.
Preferably, the output end of second current transformer is connect by second switch with the bus of the main electricity,
The output end of first current transformer is connect by first switch with the bus of the backup power source.
Preferably, the first switch and the second switch are normally off.
Preferably, the preset control strategy includes outer voltage control strategy and current inner loop control strategy.
As can be seen from the above technical solutions, the utility model embodiment has the advantage that
The utility model provides a kind of utility power quality control device of transmission line of electricity, the device include: the first current transformer,
Second current transformer, high-speed switch and controlling terminal；First current transformer and the second current transformer connect back-to-back, are built-in with preset control
The controlling terminal of strategy is connect with the first current transformer, the second current transformer, high-speed switch respectively；The output end of second current transformer and master
The bus of power supply connects, and the output end of the first current transformer and the bus of backup power source connect；Controlling terminal is for detecting
After Voltage Drop occurs for the bus of main electricity, by the state, the mode and second of the first current transformer that control high-speed switch
The mode of current transformer, so that main electricity disconnects, and carrying out voltage by backup power source temporarily will compensation.The utility model passes through
Two current transformers are connected between main electricity and backup power source, can utilize backup power source by adjusting the mode of current transformer
Carry out voltage temporarily will compensation, take full advantage of the bus electric energy of backup power source, be not necessarily to additional energy storage device, can fully demonstrate through
Ji property.
Detailed description of the invention
In order to illustrate the embodiment of the utility model or the technical proposal in the existing technology more clearly, below will be to embodiment
Or attached drawing needed to be used in the description of the prior art is briefly described, it should be apparent that, the accompanying drawings in the following description is only
It is some embodiments of the utility model, for those of ordinary skill in the art, before not making the creative labor property
It puts, can also be obtained according to these attached drawings other attached drawings.
Fig. 1 is a kind of structure of one embodiment of the utility power quality control device of transmission line of electricity provided by the utility model
Schematic diagram.
Specific embodiment
The utility model embodiment discloses a kind of utility power quality control device of transmission line of electricity, is without energy storage device
Voltage can be carried out to transmission line of electricity temporarily will compensation.
Referring to Fig. 1, a kind of one embodiment of the utility power quality control device of transmission line of electricity provided by the utility model,
It include: the first current transformer 1, the second current transformer 2, high-speed switch Ks and controlling terminal (being not drawn into Fig. 1).
Utility power quality control device provided by the embodiment of the utility model is as shown in figure 1 shown in the part in dotted line frame, and first
Current transformer 1 and the connection back-to-back of the second current transformer 2, be built-in with the controlling terminal of preset control strategy respectively with the first current transformer 1,
Second current transformer 2, high-speed switch Ks connection.The output end of second current transformer 2 is connect with the bus of main electricity 4, and first becomes
The output end of stream device 1 is connect with the bus of backup power source 3.
Further, the bus of the bus of main electricity 4 and backup power source 3 accesses on the bus of transmission line of electricity,
The bus of usual transmission line of electricity is 10KV bus, and switch K1 is provided on the bus of backup power source 3, standby for putting into or disconnecting
With power supply 3.
Further, the output end of the second current transformer 2 is connect by second switch K2 with the bus of main electricity 4,
The output end of first current transformer 1 is connect by first switch K3 with the bus of backup power source 3.
Further, first switch K3 and second switch K2 is normally off.
Further, preset control strategy includes outer voltage control strategy and current inner loop control strategy.
Utility power quality control device provided by the utility model includes two functions:
(1) voltage dip compensates.After controlling terminal is used to detect that Voltage Drop to occur for the bus of main electricity 4, lead to
State, the mode of the mode of the first current transformer 1 and the second current transformer 2 of control high-speed switch Ks are crossed, so that main electricity 4 is disconnected
It opens, and carrying out voltage by backup power source 3 temporarily will compensation.
Further, the detailed process of voltage dip compensation are as follows:
(a) after the bus generation Voltage Drop for detecting main electricity 4, control high-speed switch Ks is disconnected, according to main power supply
The busbar voltage of power supply 4 fall after voltage magnitude and the Voltage Drop time judge the voltage sag type of main electricity 4, should
Deterministic process is the well-known technique of those skilled in the art, does not do specific introduction herein.If voltage is temporarily incited somebody to action, then (b) is executed, if
It is line fault, then executes (c)；
(b) the first current transformer 1 of control is rectification mode, and (i.e. voltage falls when being fallen according to the busbar voltage of main electricity 4
The generation moment fallen) voltage-phase control the second current transformer 2 be inverter mode, until main electricity 4 busbar voltage it is extensive
It is multiple；
(c) the first current transformer 1 of control is rectification mode, voltage phase when being fallen according to the busbar voltage of main electricity 4
Position control the second current transformer 2 be inverter mode, after preset time period (the voltage dip duration due to caused by failure compared with
It is long), (following herein refers to unsteady flow to the voltage magnitude and voltage-phase that the second current transformer 2 of control follows the bus of backup power source 3
The output of device follows the amplitude and phase of busbar voltage), after the output of the second current transformer 2 is stablized, it is closed the bus of backup power source 3
On switch K1, and the second current transformer 2 is latched, according to preset control strategy by the first current transformer 1 to the bus of backup power source 3
Load current carry out harmonic wave, idle and negative sequence compensation, until main electricity 4 busbar voltage restore.
(2) harmonic wave, the compensation of idle and negative-sequence current.Controlling terminal is also used to bus, backup power source in main electricity 4
When 3 bus works normally (voltage dip also belongs to normal work after restoring), the second unsteady flow is passed through according to preset control strategy
Device 2, the first current transformer 1 carry out harmonic wave, idle to the load current of the bus of the bus of main electricity 4, backup power source 3 respectively
And negative sequence compensation.
It should be noted that the realization process of the above current compensation are as follows: the second current transformer 2 and the first current transformer 1 are examined respectively
The bus for surveying main electricity 4 and backup power source 3 flows to the harmonic wave of load side, idle, negative-sequence current, passes through outer voltage pressure stabilizing
(i.e. outer voltage control strategy) and inner ring specified current flow tracing control (current inner loop control strategy), to keep the first unsteady flow
The intermediate electric capacity of voltage regulation direct current of device 1 and the second current transformer 2 pressure is stablized, and to the bus for flowing to main electricity 4 Yu backup power source 3
Load current carry out harmonic wave, idle, negative sequence compensation.
It further, can when faults itself or itself maintenance occur for the utility power quality control device of the utility model
Output is blocked immediately with controlling the first current transformer 1 and the second current transformer 2, and disconnects second switch K2 and first switch K3, i.e.,
Can be out of service by device, so that it does not influence entire electric network composition and normal power supply.
Voltage dip can be administered and be integrated in one apparatus, both with current harmonics, idle, negative sequence compensation by the utility model
It can prevent voltage on line side from temporarily dropping to influence caused by voltage-sensitive load, and the harmonic wave of load generation, idle, negative phase-sequence can be prevented
Electric current flows into net side and causes damages to power grid, may be implemented to press in 10kV centralized and unified to the progress of multiple sensitive loads on bus
Power quality controlling.
Secondly, the present apparatus makes full use of stand-by power supply bus electric energy, without the energy storage device of additional valuableness, economic performance is obtained
To fully demonstrating.Since the device does not need series connection in the line, so loss is smaller, governance efficiency is higher, and reliability is higher,
Even if device breaks down and need to only be bypassed.
A kind of utility power quality control device of transmission line of electricity provided by the utility model is described in detail above,
For those of ordinary skill in the art, based on the idea of the embodiment of the present invention, in specific embodiment and application range
Upper there will be changes, in conclusion the content of the present specification should not be construed as a limitation of the present invention.
Claims (5)
1. a kind of utility power quality control device of transmission line of electricity characterized by comprising the first current transformer, the second current transformer, fast
Speed switch and controlling terminal；
First current transformer and second current transformer connect back-to-back, are built-in with the controlling terminal of preset control strategy
It is connect respectively with first current transformer, second current transformer, the high-speed switch；
The bus of the output end of second current transformer and main electricity connects, the output end of first current transformer with it is spare
The bus of power supply connects；
It is described quick by controlling after the controlling terminal is used to detect that Voltage Drop to occur for the bus of the main electricity
The mode of the state of switch, the mode of first current transformer and second current transformer, so that the main electricity disconnects,
And voltage is carried out temporarily for compensation by the backup power source.
2. the utility power quality control device of transmission line of electricity according to claim 1, which is characterized in that the controlling terminal is also
For when the bus of the bus of the main electricity, the backup power source works normally, according to the preset control strategy
By second current transformer, first current transformer respectively to the mother of the bus of the main electricity, the backup power source
The load current of line carries out harmonic wave, idle and negative sequence compensation.
3. the utility power quality control device of transmission line of electricity according to claim 2, which is characterized in that second current transformer
Output end connect with the bus of the main electricity by second switch, the output end of first current transformer passes through first
Switch is connect with the bus of the backup power source.
4. the utility power quality control device of transmission line of electricity according to claim 3, which is characterized in that the first switch and
The second switch is normally off.
5. the utility power quality control device of transmission line of electricity according to claim 1 or 4, which is characterized in that the preset control
System strategy includes outer voltage control strategy and current inner loop control strategy.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201821481769.XU CN208608734U (en) | 2018-09-11 | 2018-09-11 | A kind of utility power quality control device of transmission line of electricity |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201821481769.XU CN208608734U (en) | 2018-09-11 | 2018-09-11 | A kind of utility power quality control device of transmission line of electricity |
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| Publication Number | Publication Date |
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| CN208608734U true CN208608734U (en) | 2019-03-15 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109038598A (en) * | 2018-09-11 | 2018-12-18 | 广东电网有限责任公司 | A kind of the utility power quality control device and its control method of transmission line of electricity |
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2018
- 2018-09-11 CN CN201821481769.XU patent/CN208608734U/en active Active
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109038598A (en) * | 2018-09-11 | 2018-12-18 | 广东电网有限责任公司 | A kind of the utility power quality control device and its control method of transmission line of electricity |
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