CN107069765B - Low-voltage hybrid reactive compensation complete equipment and use method thereof - Google Patents
Low-voltage hybrid reactive compensation complete equipment and use method thereof Download PDFInfo
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- CN107069765B CN107069765B CN201710284949.2A CN201710284949A CN107069765B CN 107069765 B CN107069765 B CN 107069765B CN 201710284949 A CN201710284949 A CN 201710284949A CN 107069765 B CN107069765 B CN 107069765B
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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
- H02J3/18—Arrangements for adjusting, eliminating or compensating reactive power in networks
- H02J3/1821—Arrangements for adjusting, eliminating or compensating reactive power in networks using shunt compensators
-
- 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
- H02J3/01—Arrangements for reducing harmonics or ripples
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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
- Y02E40/20—Active power filtering [APF]
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- Control Of Electrical Variables (AREA)
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Abstract
The invention relates to low-voltage hybrid reactive power compensation complete equipment and a using method thereof, and belongs to the technical field of reactive power compensation equipment. The technical proposal is as follows: contain electric energy quality detection table (3), intelligent low pressure oil immersion capacitor (4), controller (5) and low pressure APF (6), electric energy quality detection table (3) interconnect with intelligent low pressure oil immersion capacitor (4), controller (5) interconnect with intelligent low pressure oil immersion capacitor (4), low pressure APF (6) respectively, all are equipped with electric energy detection unit on controller (5), the low pressure APF (6), are equipped with automatic mode structure (51) and manual mode structure (52) on controller (5). The beneficial effects of the invention are as follows: the controller can intensively control the intelligent low-pressure oil-immersed capacitor and the low-pressure APF (active power filter), and optimally combines the performance characteristics of the intelligent low-pressure oil-immersed capacitor and the low-pressure APF to achieve the result of intelligent reactive compensation.
Description
Technical Field
The invention relates to low-voltage hybrid reactive power compensation complete equipment and a using method thereof, and belongs to the technical field of reactive power compensation equipment.
Background
For reactive compensation requirements of distribution transformer areas, the original national electric company specifies in rural electric network construction and transformation technical principle: reactive compensation of the distribution transformer can be configured to be 10-15% of the capacity of the distribution transformer, but the installation position and compensation range are not clear. The rural low-voltage power technical regulations only list the number of capacitor thousands required for obtaining the required power factor per kilowatt load, and no clear regulation is made on the reactive compensation capacity of distribution transformer, low-voltage lines and user motors.
However, in practice, the low-voltage distribution transformer area of the distribution rural power network is not compensated in situ, and meanwhile, in practical application, if a capacitor is configured at the low-voltage side of the distribution transformer according to 10-15% of the capacity of the capacitor, overcompensation can be caused, which affects the accuracy of line loss statistics of the distribution transformer area and leads to ineffective reactive compensation of the low-voltage line, thereby reducing the running economy of the whole distribution transformer area.
In addition, the transformer area for installing the low-voltage reactive compensation equipment is mainly a self-healing capacitor without reactance, and the self-healing capacitor is directly switched by a contactor, and is limited by the characteristics of the self-healing capacitor, poor running reliability and weak reactive support capability. The factors such as common overvoltage, switching inrush current, harmonic wave and environmental temperature in the low-voltage transformer area have great influence on the self-healing capacitor. Especially, when the self-healing fails, the insulation level of the components is reduced, even short circuit is caused, and individual phenomena such as bulging, bursting and the like are generated.
The reactive compensation capacity of the transformer area without the low-voltage reactive compensation equipment mainly depends on reactive power down-filling of an upper power supply station, unstable voltage of a power grid can occur, terminal voltage is reduced, line loss is further caused, electric energy quality is reduced, and influence on enterprise benefits is great.
The protection control of the current low-voltage reactive compensation equipment also has a certain problem, and the reactive compensation controller generally has three modes of voltage time control, power factor control and voltage reactive control, and cannot completely adapt to the needs of various load properties, and is basically designed by assuming that the load side properties are in a linear state. Meanwhile, most of the closed-loop technical measures for voltage and reactive power change after switching of the capacitor and avoiding switching oscillation are lacking. The sampled signal typically takes the phase difference between the line voltage and the phase current, in such a way that the power factor value is often wrong when the current signal is small.
Disclosure of Invention
The invention aims to provide low-voltage hybrid reactive compensation complete equipment and a using method thereof, wherein a controller is adopted to intensively control an intelligent low-voltage oil immersion capacitor and a low-voltage APF (active power filter), so that the performance characteristics of the intelligent low-voltage oil immersion capacitor and the low-voltage APF are optimally combined, the intelligent reactive compensation result is achieved, and the problems in the background technology are effectively solved.
The technical scheme of the invention is as follows: the utility model provides a low pressure hybrid reactive compensation complete sets, contains alternating current transformer, nonlinear load, electric energy quality detection table, intelligent low pressure oil immersion capacitor, controller and low pressure APF, electric energy quality detection table, intelligent low pressure oil immersion capacitor, controller, low pressure APF all are connected to the electric wire netting circuit between alternating current transformer and the nonlinear load, electric energy quality detection table and intelligent low pressure oil immersion capacitor interconnect, the controller respectively with intelligent low pressure oil immersion capacitor, low pressure APF interconnect, all be equipped with electric energy detection unit on controller, the low pressure APF, be equipped with automatic mode structure and manual mode structure on the controller.
The intelligent low-pressure oil immersion capacitor is divided into two groups, namely a common compensation capacitor group and a sub-compensation capacitor group.
The intelligent low-voltage oil immersion capacitor is an intelligent low-voltage non-self-healing oil capacitor.
The system also comprises a human-computer interface which is connected with the controller.
The electric energy quality detection meter, the intelligent low-voltage oil immersion capacitor, the controller and the low-voltage APF are connected to the same CAN (controller area network) bus.
The low-voltage APF comprises a harmonic detection unit, a main controller, an instruction electric wave unit, a control circuit unit, a driving circuit and a main circuit, which are sequentially connected.
The low-voltage APF is a commercial product and is a power electronic device for dynamically restraining harmonic waves and compensating reactive power, which can compensate the harmonic waves and the reactive power which change in size and frequency, and is called active, and the device needs to be provided with a power supply as the name implies, and the application of the device can overcome the defects of the traditional harmonic wave restraining and reactive power compensating methods such as an LC filter (the traditional method can only be used for fixed compensation), so that dynamic tracking compensation is realized, and the harmonic waves and the reactive power can be compensated.
The application method of the low-voltage hybrid reactive compensation complete equipment comprises the following steps of:
the electric energy quality detection meter, the intelligent low-voltage oil immersion capacitor, the controller and the low-voltage APF are all connected to a power grid line between the nonlinear load and the alternating-current transformer; detecting the power quality of the power grid and compensating the power grid power;
the electric energy quality detection meter is used for detecting the electric energy of the circuit and transmitting the detection result to the intelligent low-voltage oil immersion capacitor; the electric energy quality detection meter also transmits the detection result to the controller and the low-voltage APF; the controller and the low-voltage APF are respectively provided with a self-charging energy quality detection unit; under the condition that an electric energy quality detection meter, a controller and a low-voltage APF self-charging electric energy quality detection unit exist at the same time, selecting one to work or working at the same time;
the controller is switched between an automatic mode and a manual mode, and in the automatic mode, the controller determines reactive compensation and harmonic wave treatment schemes based on the electric energy quality conditions detected by the self-powered electric energy quality detection unit and/or the electric energy quality detection meter and controls the intelligent low-voltage oil immersion capacitor and/or the low-voltage APF to perform reactive compensation and/or harmonic wave treatment; in the manual mode, the self-charging energy quality detection unit of the controller does not detect line electric energy any more, the controller is communicated with the intelligent low-pressure oil immersion capacitor and the low-pressure APF, the intelligent low-pressure oil immersion capacitor determines and executes a reactive compensation scheme based on the electric energy quality condition detected by the electric energy quality detection meter, and after the intelligent low-pressure oil immersion capacitor is compensated, the low-pressure APF6 automatically determines and executes reactive and harmonic treatment investment needing compensation based on harmonic and reactive conditions detected by the self-charging energy quality detection unit and/or the electric energy quality detection meter.
In the automatic mode, when reactive compensation is performed, the controller preferentially adopts the intelligent low-voltage oil immersion capacitor to perform reactive compensation. That is, after reactive compensation is performed by using the intelligent low-voltage oil immersion capacitor, whether reactive compensation and harmonic suppression are performed by using the low-voltage APF is considered.
The beneficial effects of the invention are as follows: the controller can intensively control the intelligent low-pressure oil-immersed capacitor and the low-pressure APF (active power filter), and optimally combines the performance characteristics of the intelligent low-pressure oil-immersed capacitor and the low-pressure APF to achieve the result of intelligent reactive compensation.
Drawings
FIG. 1 is a schematic diagram of the structure of the present invention;
in the figure: the system comprises an alternating-current transformer 1, a nonlinear load 2, an electric energy quality detection meter 3, an intelligent low-voltage oil immersion capacitor 4, a controller 5, a low-voltage APF6, a power grid line 7, a control board 41, an automatic mode structure 51, a manual mode structure 52, a harmonic detection unit 61, a master controller 62, a command electric wave unit 63, a control circuit unit 64, a driving circuit 65 and a main circuit 66.
Detailed Description
The invention is further illustrated by the following examples in conjunction with the accompanying drawings.
The utility model provides a low pressure hybrid reactive compensation complete sets, contains alternating current transformer 1, nonlinear load 2, electric energy quality detection table 3, intelligent low pressure oil immersion capacitor 4, controller 5 and low pressure APF6, electric energy quality detection table 3, intelligent low pressure oil immersion capacitor 4, controller 5, low pressure APF6 all are connected to the electric wire netting line 7 between alternating current transformer 1 and the nonlinear load 2, electric energy quality detection table 3 and intelligent low pressure oil immersion capacitor 4 interconnect, controller 5 respectively with intelligent low pressure oil immersion capacitor 4, low pressure APF6 interconnect, all be equipped with electric energy detection unit on controller 5, the low pressure APF6, be equipped with automatic mode structure 51 and manual mode structure 52 on the controller 5.
The intelligent low-pressure oil immersion capacitor 4 is divided into two groups, namely a common compensation capacitor group and a sub-compensation capacitor group.
The intelligent low-voltage oil immersion capacitor 4 is an intelligent low-voltage non-self-healing oil type capacitor.
And also comprises a human-machine interface which is connected with the controller 5.
The electric energy quality detection meter 3, the intelligent low-voltage oil immersion capacitor 4, the controller 5 and the low-voltage APF6 are connected to the same CAN (controller area network) bus.
The low-voltage APF6 includes a harmonic detection unit 61, a master controller 62, a command wave unit 63, a control circuit unit 64, a driving circuit 65, and a main circuit 66, which are sequentially connected.
The low-voltage APF is a commercial product and is a power electronic device for dynamically restraining harmonic waves and compensating reactive power, which can compensate the harmonic waves and the reactive power which change in size and frequency, and is called active, and the device needs to be provided with a power supply as the name implies, and the application of the device can overcome the defects of the traditional harmonic wave restraining and reactive power compensating methods such as an LC filter (the traditional method can only be used for fixed compensation), so that dynamic tracking compensation is realized, and the harmonic waves and the reactive power can be compensated.
The application method of the low-voltage hybrid reactive compensation complete equipment comprises the following steps of:
the electric energy quality detection meter 3, the intelligent low-voltage oil immersion capacitor 4, the controller 5 and the low-voltage APF6 are all connected to a power grid line between the nonlinear load 2 and the alternating-current transformer 1; detecting the power quality of the power grid and compensating the power grid power;
the electric energy quality detection meter 3 is used for detecting line electric energy and transmitting a detection result to the intelligent low-voltage oil immersion capacitor 4; the electric energy quality detection meter 3 also transmits the detection result to the controller 5 and the low-voltage APF 6; the controller 5 and the low-voltage APF6 are respectively provided with a self-charging energy quality detection unit; under the condition that the electric energy quality detection meter 3, the controller and the low-voltage APF6 self-charging electric energy quality detection unit exist at the same time, the electric energy quality detection meter can work alternatively or simultaneously;
the controller 5 switches between an automatic mode and a manual mode, in which the controller 5 determines reactive compensation and harmonic suppression schemes based on the power quality conditions detected by the self-charging power quality detection unit and/or the power quality detection meter 3, and controls the intelligent low-voltage oil immersion capacitor 4 and/or the low-voltage APF6 to perform reactive compensation and/or harmonic suppression; in the manual mode, the self-charging energy quality detection unit of the controller 5 does not detect the line energy any more, the controller 5 communicates with the intelligent low-voltage oil-immersed capacitor 4 and the low-voltage APF6, the intelligent low-voltage oil-immersed capacitor 4 determines and executes a reactive compensation scheme based on the energy quality condition detected by the energy quality detection meter 3, and after the intelligent low-voltage oil-immersed capacitor 4 is compensated, the low-voltage APF6 determines and executes reactive power and harmonic treatment investment required to be compensated based on the self-charging energy quality detection unit and/or the harmonic and reactive power condition detected by the energy quality detection meter 3.
In the automatic mode, the controller 5 preferably adopts the intelligent low-voltage oil immersion capacitor 4 to perform reactive compensation when performing reactive compensation. That is, after reactive compensation is performed by using the intelligent low-voltage oil immersion capacitor 4, whether reactive compensation and harmonic suppression are performed by using the low-voltage APF6 is considered.
In the first embodiment, the intelligent low-voltage oil immersion capacitor 4 has two groups, namely a co-compensation capacitor group and a sub-compensation capacitor group, so as to be put into use according to the requirement. The common compensation capacitor group compensates three phases at the same time; the sub-compensation capacitor group comprises three capacitors which can independently compensate corresponding phases.
The controller 5 determines the number of groups of intelligent low-voltage oil-immersed capacitors 4 to be put into in an optimized manner according to the power quality and the conditions of the available capacitors. If the intelligent low-voltage oil immersion capacitor 4 is put into the system and cannot meet reactive compensation requirements, the low-voltage APF6 is put into the system for small-capacity adjustment, namely more accurate compensation. If the intelligent low-voltage oil immersion capacitor 4 is put into, reactive compensation can be well carried out, and adjustment is not needed when the low-voltage APF6 is put into.
In the first embodiment, when the controller 5 fails, the controller 5 automatically shifts to the manual mode, and in the manual mode, the controller 5 only functions as a communication connection. That is, in manual mode, the controller 5 no longer determines reactive compensation and harmonic remediation schemes, no longer controls the intelligent low pressure oil immersion capacitor 4 and/or the low pressure APF6 for reactive compensation and/or harmonic remediation; also, in the manual mode, the power quality detection unit of the controller 5 no longer detects the line power.
In a second embodiment (another embodiment), the low-voltage hybrid reactive compensation complete equipment further includes a man-machine interface, the man-machine interface is connected with the controller, information such as an operation state and a fault of the low-voltage hybrid reactive compensation complete equipment is intensively input to the controller and can be displayed on the man-machine interface, wherein the man-machine interface is a touch screen, a data history curve and a fault history of the intelligent low-voltage oil immersion capacitor 4 and the low-voltage APF6 can be referred through the man-machine interface, the man-machine interface has a striking alarm indication, the fault type is divided into a light fault and a heavy fault, the light fault is that the equipment can continue to operate, maintenance is needed, the heavy fault is that the equipment must be immediately out of operation, and maintenance is performed.
It will be appreciated that in manual mode, the controller still communicates with the intelligent low pressure oil immersion capacitor 4 and/or the low pressure APF6 to obtain information about its operating state or compensation.
In a third embodiment (third embodiment), the electric energy quality detection meter, the intelligent low-pressure oil immersion capacitor, the controller and the low-pressure APF are connected to the same CAN bus and communicate through the CAN bus, wherein in the automatic mode, the controller is used as a master device, the electric energy quality detection meter, the intelligent low-pressure oil immersion capacitor and the low-pressure APF are used as slave devices, and in the manual mode, the controller, the electric energy quality detection meter, the intelligent low-pressure oil immersion capacitor and the low-pressure APF are used as slave devices.
And the detection result of the electric energy quality detection meter is transmitted to the controller, the intelligent low-voltage oil immersion capacitor and the low-voltage APF through the CAN bus. Therefore, the data transmission is more convenient, and the structure is simpler. And the controller and the power quality detection unit of the low-voltage APF can be omitted.
The intelligent low-voltage oil immersion capacitor 4 is an intelligent low-voltage non-self-healing oil type capacitor.
In the low-voltage hybrid reactive compensation complete equipment, the controller can intensively control the intelligent low-voltage non-self-healing oil capacitor and the APF, and optimally combines the performance characteristics of the intelligent low-voltage non-self-healing oil capacitor and the APF to achieve the result of intelligent reactive compensation.
The low-voltage hybrid reactive compensation complete equipment is particularly suitable for various reactive compensation technologies applied to low-voltage transformer areas of the distribution rural power network. The invention can effectively combine the characteristics of low-voltage active filter equipment (low-voltage APF) and passive compensation (intelligent low-voltage oil immersion capacitor), and research on a novel low-voltage intelligent reactive compensation technology with intelligent analysis control, protection and higher operation reliability. Therefore, the low-voltage hybrid reactive compensation complete equipment can change the current inherent equipment compensation mode, and improve the reliability of equipment control, protection and operation. The benefit is improved, the line loss is reduced, the voltage quality is improved, and the problems of high voltage and low voltage are reduced. According to the invention, a novel intelligent reactive compensation technology is adopted in the distribution transformer area, so that the low-voltage line is effectively subjected to reactive compensation, and the running economy of the whole distribution transformer area is improved. In addition, the invention can effectively reduce the loss of the power supply transformer and the conveying line, improve the power supply efficiency, improve the power supply environment, improve the power quality and ensure the enterprise benefit.
Claims (6)
1. A low-voltage hybrid reactive compensation complete equipment is characterized in that: contain alternating current transformer (1), nonlinear load (2), electric energy quality detection table (3), intelligent low pressure oil immersion capacitor (4), controller (5) and low pressure APF (6), electric energy quality detection table (3), intelligent low pressure oil immersion capacitor (4), controller (5), low pressure APF (6) all are connected to the electric wire netting circuit between alternating current transformer (1) and nonlinear load (2), electric energy quality detection table (3) interconnect with intelligent low pressure oil immersion capacitor (4), controller (5) interconnect with intelligent low pressure oil immersion capacitor (4), low pressure APF (6) respectively, all are equipped with electric energy detection unit on controller (5), the low pressure APF (6), be equipped with automatic mode structure (51) and manual mode structure (52) on controller (5).
2. A low-voltage hybrid reactive compensation plant according to claim 1, characterized in that: the intelligent low-pressure oil immersion capacitor (4) is divided into two groups, namely a common compensation capacitor group and a sub-compensation capacitor group.
3. A low-voltage hybrid reactive compensation plant according to claim 1, characterized in that: the intelligent low-voltage oil immersion capacitor (4) is an intelligent low-voltage non-self-healing oil type capacitor.
4. A low-voltage hybrid reactive compensation plant according to claim 1, characterized in that: and a human-computer interface is also included and is connected with the controller (5).
5. A low-voltage hybrid reactive compensation plant according to claim 1, characterized in that: the electric energy quality detection meter (3), the intelligent low-voltage oil immersion capacitor (4), the controller (5) and the low-voltage APF (6) are connected to the same CAN bus.
6. A low-voltage hybrid reactive compensation plant according to claim 1, characterized in that: the low-voltage APF (6) comprises a harmonic detection unit (61), a master controller (62), an instruction electric wave unit (63), a control circuit unit (64), a driving circuit (65) and a main circuit (66), which are sequentially connected.
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| CN201710284949.2A CN107069765B (en) | 2017-04-27 | 2017-04-27 | Low-voltage hybrid reactive compensation complete equipment and use method thereof |
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| CN201710284949.2A CN107069765B (en) | 2017-04-27 | 2017-04-27 | Low-voltage hybrid reactive compensation complete equipment and use method thereof |
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| CN107069765A CN107069765A (en) | 2017-08-18 |
| CN107069765B true CN107069765B (en) | 2023-07-21 |
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Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN1734879A (en) * | 2005-07-18 | 2006-02-15 | 西安交通大学 | Electrical energy mass compositive controller for power system transformer substation |
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2017
- 2017-04-27 CN CN201710284949.2A patent/CN107069765B/en active Active
Patent Citations (5)
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|---|---|---|---|---|
| FR2951774A1 (en) * | 2009-10-27 | 2011-04-29 | Peugeot Citroen Automobiles Sa | Pneumatic control device for internal combustion engine, has conduit connecting electro valve to pneumatic actuator, pneumatic control branch connected to vacuum circuit by electro valve, and pressure sensor arranged on branch |
| CN103441511A (en) * | 2013-08-14 | 2013-12-11 | 毛振刚 | Intelligent low-voltage dynamic-compensation energy-saving filtering device |
| CN103760888A (en) * | 2014-01-02 | 2014-04-30 | 国家电网公司 | Closed loop simulation testing method of low-voltage active filter controller based on RTDS |
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