CN107026454B - Zero sequence voltage compensation device and power distribution system - Google Patents
Zero sequence voltage compensation device and power distribution system Download PDFInfo
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- CN107026454B CN107026454B CN201710436756.4A CN201710436756A CN107026454B CN 107026454 B CN107026454 B CN 107026454B CN 201710436756 A CN201710436756 A CN 201710436756A CN 107026454 B CN107026454 B CN 107026454B
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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
- H02J3/12—Circuit arrangements for ac mains or ac distribution networks for adjusting voltage in ac networks by changing a characteristic of the network load
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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
- H02J3/26—Arrangements for eliminating or reducing asymmetry in polyphase networks
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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
- Y02E40/50—Arrangements for eliminating or reducing asymmetry in polyphase networks
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Abstract
The invention provides a zero sequence voltage compensation device and a power distribution system, and relates to the technical field of zero sequence voltage compensation. The zero sequence voltage compensation device is applied to a power distribution system. The power distribution system comprises a three-phase power supply, a load and a neutral line, and the zero sequence voltage compensation device comprises a voltage compensation circuit for outputting compensation voltage to the power distribution system and a controller for controlling the phase and amplitude of the compensation voltage according to the current working voltage and working current of the power distribution system. The input end of the voltage compensation circuit and the first end of the load are respectively connected with a three-phase power supply, the first output end and the second output end of the voltage compensation circuit are respectively connected with the second end of the load and a neutral line, the input end of the controller is connected with the first end of the load, and the output end of the controller is connected with the control end of the voltage compensation circuit. Through the arrangement, the problem of high cost existing in the existing technology for reducing the zero sequence voltage amplitude can be solved.
Description
Technical Field
The invention relates to the technical field of zero sequence voltage compensation, in particular to a zero sequence voltage compensation device and a power distribution system.
Background
As the application environment of power distribution systems continues to be complex, the power distribution systems often exhibit asymmetric operating conditions. In asymmetric operation, positive sequence, negative sequence and zero sequence voltage and current are generally generated, wherein zero sequence voltage has the greatest influence on the operation of equipment or load, such as reduced service life of a motor, vibration and noise, and breakdown of the equipment or load is caused when serious, so that serious safety accidents are caused.
The inventor researches find that the prior art is to reduce the amplitude of the zero sequence voltage by increasing the sectional area of the neutral line to reduce the impedance. However, increasing the neutral cross-sectional area reduces the impedance and also causes a problem in that the cost of the distribution line increases dramatically.
Disclosure of Invention
In view of the above, the present invention aims to provide a zero sequence voltage compensation device and a power distribution system, so as to solve the problem of high cost existing in the existing technology for reducing the zero sequence voltage amplitude.
In order to achieve the above purpose, the embodiment of the present invention adopts the following technical scheme:
a zero sequence voltage compensation device is applied to a power distribution system. The power distribution system comprises a three-phase power supply, a load and a neutral line, and the zero sequence voltage compensation device comprises a voltage compensation circuit for outputting compensation voltage to the power distribution system and a controller for controlling the phase and amplitude of the compensation voltage according to the current working voltage and working current of the power distribution system.
The input end of the voltage compensation circuit and the first end of the load are respectively connected with the three-phase power supply, the first output end and the second output end of the voltage compensation circuit are respectively connected with the second end of the load and the neutral line, the input end of the controller is connected with the first end of the load, and the output end of the controller is connected with the control end of the voltage compensation circuit.
In a preferred option of the embodiment of the present invention, in the above zero sequence voltage compensation device, the voltage compensation circuit includes a rectifying circuit, an inverter circuit, and an output circuit.
The input end of the rectifying circuit is connected with the three-phase power supply, the output end of the rectifying circuit is connected with the input end of the inverter circuit, the output end of the inverter circuit is connected with the input end of the output circuit, the control end of the inverter circuit is connected with the output end of the controller, and the first output end and the second output end of the output circuit are respectively connected with the second end of the load and the neutral line.
In a preferred option of the embodiment of the present invention, in the above zero sequence voltage compensation device, the voltage compensation circuit further includes a first filter circuit, and the first filter circuit is disposed between the output end of the rectifying circuit and the input end of the inverter circuit.
In a preferred option of the embodiment of the present invention, in the above zero sequence voltage compensation device, the voltage compensation circuit further includes an overvoltage detection circuit and an overvoltage protection circuit that are disposed in association, two ends of the overvoltage detection circuit are respectively connected to the first output end and the second output end of the output circuit, and the overvoltage protection circuit is disposed between the output end of the first filter circuit and the input end of the inverter circuit.
The overvoltage detection circuit is used for detecting whether the zero sequence voltage of the power distribution system exceeds a preset voltage, and the overvoltage protection circuit is used for cutting off power supply to the inverter circuit when the zero sequence voltage of the power distribution system exceeds the preset voltage so that the output circuit outputs uncompensated voltage.
In a preferred option of the embodiment of the present invention, in the above zero sequence voltage compensation device, the voltage compensation circuit further includes a second filter circuit, and the second filter circuit is disposed between the output end of the inverter circuit and the input end of the output circuit.
In a preferred option of the embodiment of the present invention, in the above zero sequence voltage compensation device, the output circuit includes a zero sequence transformer, a primary coil of the zero sequence transformer is connected to an output end of the inverter circuit, and a secondary coil of the zero sequence transformer is connected to a second end of the load.
In a preferred option of the embodiment of the present invention, in the above zero sequence voltage compensation device, the output circuit includes a zero sequence transformer, a primary coil of the zero sequence transformer is connected to an output end of the inverter circuit, and two ends of a secondary coil are respectively connected to a second end of the load and the neutral line.
The current transformer is used for detecting a current value of a neutral line of the power distribution system and sending the current value to the controller, and the controller is used for adjusting impedance parameters of the zero sequence transformer according to the current value so as to control the compensation voltage.
In a preferred option of the embodiment of the present invention, in the above zero sequence voltage compensation device, the zero sequence transformer includes a first core provided with the primary winding and the secondary winding, a second core provided with a trip component, and an elastic component for connecting the first core and the second core.
The controller can control the relative position relation of the first iron core and the second iron core through the matching arrangement of the tripping component and the elastic component so as to adjust the impedance parameter of the zero sequence transformer.
On the basis of the above, the embodiment of the invention also provides a power distribution system, which comprises a three-phase power supply, a load, a neutral line and the zero sequence voltage compensation device, wherein the zero sequence voltage compensation device comprises a voltage compensation circuit for outputting compensation voltage to the power distribution system and a controller for controlling the phase and amplitude of the compensation voltage according to the current working voltage and working current of the power distribution system.
The input end of the voltage compensation circuit and the first end of the load are respectively connected with the three-phase power supply, the first output end and the second output end of the voltage compensation circuit are respectively connected with the second end of the load and the neutral line, the input end of the controller is connected with the first end of the load, and the output end of the controller is connected with the control end of the voltage compensation circuit.
In a preferred option of the embodiment of the present invention, in the above power distribution system, the power distribution system is a three-phase four-wire system, and the load includes a first load, a second load, and a third load respectively disposed in each phase circuit.
The first end of the first load, the first end of the second load and the first end of the third load are respectively connected with a three-phase power supply and are respectively connected with three input ends of the voltage compensation circuit, and the second end of the first load, the second end of the second load and the second end of the third load are connected with the neutral line through the voltage compensation circuit after being connected.
The invention provides a zero sequence voltage compensation device and a power distribution system, which can calculate compensation voltage to be output according to the current working voltage and working current of the power distribution system by arranging a voltage compensation circuit and a controller which are matched with each other, and the compensation voltage is input into the power distribution system through the voltage compensation circuit, so that the problem of high cost existing in the existing technology for reducing the amplitude of the zero sequence voltage can be solved, and the practicability and reliability of the zero sequence voltage compensation device and the power distribution system are effectively improved.
Further, by setting the current transformer to detect the current value of the neutral line, the controller can control the impedance parameter of the zero-sequence transformer according to the current value, and can adjust the impedance parameter to adapt to different power distribution systems, so as to solve the problem of large zero-sequence impedance of the transformer, and greatly improve the intelligence and practicality of the zero-sequence voltage compensation device and the power distribution system.
In order to make the above objects, features and advantages of the present invention more comprehensible, preferred embodiments accompanied with figures are described in detail below.
Drawings
Fig. 1 is an application block diagram of a zero sequence voltage compensation device provided by an embodiment of the present invention.
Fig. 2 is a block diagram of a voltage compensation circuit according to an embodiment of the present invention.
Fig. 3 is a schematic circuit diagram of a rectifying circuit according to an embodiment of the present invention.
Fig. 4 is a schematic circuit diagram of an inverter circuit according to an embodiment of the present invention.
Fig. 5 is a schematic circuit diagram of an output circuit according to an embodiment of the present invention.
Fig. 6 is a block diagram of a first core and a second core of a zero sequence transformer according to an embodiment of the present invention.
Fig. 7 is a block diagram of a first core and a second core separated state of a zero sequence transformer according to an embodiment of the present invention.
Fig. 8 is another block diagram of a voltage compensation circuit according to an embodiment of the present invention.
Fig. 9 is another block diagram of a voltage compensation circuit according to an embodiment of the present invention.
Fig. 10 is a schematic circuit diagram of an overvoltage detection circuit according to an embodiment of the present invention.
Fig. 11 is a schematic circuit diagram of an overvoltage protection circuit according to an embodiment of the present invention.
Icon: 10-an electrical distribution system; 20-zero sequence voltage compensation device; 30-loading; a 100-voltage compensation circuit; 110-a rectifying circuit; 120-an inverter circuit; 130-an output circuit; l1-primary coil; l2-secondary coil; 134-a first core; 135-a second core; 136-trip member; 137-an elastic member; 140-first a filter circuit; 150-a second filter circuit; 160-an overvoltage detection circuit; 170-an overvoltage protection circuit; 200-controller.
Detailed Description
For the purpose of making the objects, technical solutions and advantages of the embodiments of the present invention more apparent, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention, and it is apparent that the described embodiments are only some embodiments of the present invention, but not all embodiments of the present invention. The components of the embodiments of the present invention generally described and illustrated in the figures herein may be arranged and designed in a wide variety of different configurations.
Thus, the following detailed description of the embodiments of the invention, as presented in the figures, is not intended to limit the scope of the invention, as claimed, but is merely representative of selected embodiments of the invention. 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.
It should be noted that: like reference numerals and letters denote like items in the following figures, and thus once an item is defined in one figure, no further definition or explanation thereof is necessary in the following figures. In the description of the present invention, the terms "first," "second," and the like are used merely to distinguish between descriptions and should not be construed as merely or implying relative importance.
In the description of the present invention, unless explicitly stated and limited otherwise, the terms "disposed," "connected," and "connected" are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; can be directly connected or indirectly connected through an intermediate medium, and can be communication between two elements. The specific meaning of the above terms in the present invention will be understood in specific cases by those of ordinary skill in the art.
As shown in fig. 1, an embodiment of the present invention provides a zero sequence voltage compensation device 20, applied to the power distribution system 10. The power distribution system 10 comprises a load 30, a three-phase power supply and a neutral line, and the zero sequence voltage compensation device 20 comprises a voltage compensation circuit 100 and a controller 200. The voltage compensation circuit 100 is configured to output a compensation voltage to the power distribution system 10, and the controller 200 is configured to control a phase and an amplitude of the compensation voltage according to a present operating voltage and an operating current of the power distribution system 10.
Further, in this embodiment, the input terminal of the voltage compensation circuit 100 and the first terminal of the load 30 are connected to the three-phase power supply, the first output terminal and the second output terminal of the voltage compensation circuit 100 are connected to the second terminal of the load 30 and the neutral line, respectively, the input terminal of the controller 200 is connected to the first terminal of the load 30, and the output terminal is connected to the control terminal of the voltage compensation circuit 100.
By the arrangement, the following can be realized: the controller 200 obtains the current working voltage and working voltage of the power distribution system 10, performs zero sequence voltage calculation through a stored program to obtain a compensation voltage value to be output to the power distribution system 10, and generates a corresponding control command according to the compensation voltage value, and the voltage compensation circuit 100 outputs a corresponding compensation voltage to the power distribution system 10 according to the control command, thereby realizing compensation of the zero sequence voltage of the power distribution system 10.
Referring to fig. 2, in the present embodiment, the voltage compensation circuit 100 may include a rectifying circuit 110, an inverting circuit 120, and an output circuit 130. The input end of the rectifying circuit 110 is connected with the three-phase power supply, the output end of the rectifying circuit 110 is connected with the input end of the inverter circuit 120, the output end of the inverter circuit 120 is connected with the input end of the output circuit 130, the control end of the rectifying circuit is connected with the output end of the controller 200, and the first output end and the second output end of the output circuit 130 are respectively connected with the second end of the load 30 and the neutral line.
By the arrangement, the following can be realized: the rectifying circuit 110 obtains an electrical signal of the power distribution system 10 and performs rectifying processing, the rectified electrical signal is transmitted to the inverter circuit 120, and the inverter circuit 120 performs inverting processing on the electrical signal under the control of the controller 200 to obtain the compensation voltage and inputs the compensation voltage to the power distribution system 10 through the output circuit 130.
Alternatively, the specific circuit type and the included electrical components of the rectifying circuit 110 are not limited, and may be, for example, an integrated circuit including only diodes, or having rectifying function. Referring to fig. 3, in this embodiment, the rectifying circuit 110 is composed of three parallel diodes, and each diode includes at least two diodes connected in series.
Alternatively, the specific circuit type and the included electrical components of the inverter circuit 120 are not limited, and may be, for example, a module including only IGBT high-power electronic transistors (insulated gate bipolar transistors), or an integrated circuit having an inverter function. Referring to fig. 4, in this embodiment, the inverter circuit 120 is composed of four IGBT transistor modules, and gates of the respective transistors are connected to an output terminal of the controller 200.
Optionally, the specific circuit type and the included electrical components of the output circuit 130 are not limited. Referring to fig. 5, in this embodiment, the output circuit 130 includes a zero sequence transformer, a primary winding L1 of the zero sequence transformer is connected to an output terminal of the inverter circuit 120, and two ends of a secondary winding L2 are respectively connected to a second terminal of the load 30 and the neutral line.
Optionally, the specific structure of the zero sequence transformer is not limited. Referring to fig. 6 and 7, in the present embodiment, the zero sequence transformer includes a first core 134 provided with the primary winding L1 and the secondary winding L2, a second core 135 provided with a trip member 136, and an elastic member 137 for connecting the first core 134 and the second core 135. The first core 134 and the second core 135 are cooperatively disposed, and can form a closed loop structure in the engaged state under the cooperation of the trip member 136 and the elastic member 137.
By the arrangement, the following can be realized: the controller 200 can control the relative position relationship between the first iron core 134 and the second iron core 135 through the matching arrangement of the tripping component 136 and the elastic component 137 so as to adjust the impedance parameter of the zero sequence transformer, and the output compensation voltage can be more adapted to the power distribution system 10 through adjusting the impedance parameter. The relative positional relationship of the first core 134 and the second core 135 includes a separation state relationship and an attraction state relationship.
Optionally, the basis by which the controller 200 adjusts the impedance parameters of the zero sequence transformer is not limited. In this embodiment, the controller 200 controls the impedance parameter of the zero sequence transformer according to the magnitude of the current value of the neutral line.
Alternatively, the manner in which the controller 200 acquires the current value of the neutral line is not limited. In this embodiment, the voltage compensation circuit 100 further includes a current transformer, which is disposed between the secondary winding L2 of the zero sequence transformer and the second end of the load 30 and is connected to the input end of the controller 200.
The current transformer is used for detecting a current value of a neutral line of the power distribution system 10 and sending the current value to the controller 200, and the controller 200 is used for adjusting an impedance parameter of the zero sequence transformer according to the current value so as to control the compensation voltage.
Referring to fig. 8, in this embodiment, the voltage compensation circuit 100 may further include a first filter circuit 140 and a second filter circuit 150. The first filter circuit 140 is disposed between the output end of the rectifying circuit 110 and the input end of the inverter circuit 120, and the second filter circuit 150 is disposed between the output end of the inverter circuit 120 and the input end of the output circuit 130.
Optionally, the specific circuit structures and included electrical components of the first filter circuit 140 and the second filter circuit 150 are not limited, and may be, for example, a pure capacitive filter circuit, an RC filter circuit, or an integrated circuit with a filtering function. In this embodiment, the first filter circuit 140 is a pure capacitor circuit, and includes two capacitors connected in series. The second filter capacitor is an RC filter circuit and comprises two resistors connected in parallel and capacitors connected with the two resistors respectively.
Referring to fig. 9, in this embodiment, the voltage compensation circuit 100 may further include an overvoltage detection circuit 160 and an overvoltage protection circuit 170 that are disposed in association. The two ends of the overvoltage detection circuit 160 are respectively connected to the first output end and the second output end of the output circuit 130, and the overvoltage protection circuit 170 is disposed between the output end of the first filter circuit 140 and the input end of the inverter circuit 120.
The overvoltage detection circuit 160 is configured to detect whether the zero-sequence voltage of the power distribution system 10 exceeds a preset voltage, and the overvoltage protection circuit 170 is configured to cut off power to the inverter circuit 120 when the zero-sequence voltage of the power distribution system 10 exceeds the preset voltage, so that the output circuit 130 outputs no compensation voltage.
Alternatively, the specific circuit configuration and the included electrical components of the overvoltage detection circuit 160 and the overvoltage protection circuit 170 are not limited as long as the purpose of monitoring the overvoltage condition and cutting off the circuit in the overvoltage condition can be achieved. Referring to fig. 10 and 11, in this embodiment, the overvoltage detection circuit 160 includes a coil of a voltage relay and a normally open contact of an ac contactor connected in parallel. The overvoltage protection circuit 170 comprises an indicator lamp, a normally-closed button, a normally-open contact of a voltage relay, a normally-open contact of a contactor, a normally-closed contact and a coil.
The embodiment of the invention also provides a power distribution system 10, which comprises a three-phase power supply, a neutral line, a load 30 and the zero sequence voltage compensation device 20. The zero sequence voltage compensation device 20 comprises a voltage compensation circuit 100 for outputting a compensation voltage to the power distribution system 10 and a controller 200 for controlling the phase and amplitude of the compensation voltage according to the present operating voltage and operating current of the power distribution system 10.
Further, in this embodiment, the input terminal of the voltage compensation circuit 100 and the first terminal of the load 30 are connected to the three-phase power supply, the first output terminal and the second output terminal of the voltage compensation circuit 100 are connected to the second terminal of the load 30 and the neutral line, respectively, the input terminal of the controller 200 is connected to the first terminal of the load 30, and the output terminal is connected to the control terminal of the voltage compensation circuit 100.
The power distribution system 10 is a three-phase four-wire system, and the load 30 includes a first load, a second load, and a third load respectively disposed in each phase circuit. The first end of the first load, the first end of the second load and the first end of the third load are respectively connected with a three-phase power supply and are respectively connected with three input ends of the voltage compensation circuit 100, and the second end of the first load, the second end of the second load and the second end of the third load are connected with the neutral line through the voltage compensation circuit 100 after being connected.
In summary, by arranging the voltage compensation circuit 100 and the controller 200 that are mutually matched, the zero-sequence voltage compensation device 20 and the power distribution system 10 provided by the invention can calculate the compensation voltage to be output according to the current working voltage and working current of the power distribution system 10 and input the compensation voltage to the power distribution system 10 through the voltage compensation circuit 100, thus solving the problem of high cost in the existing technology of reducing the zero-sequence voltage amplitude and effectively improving the practicability and reliability of the zero-sequence voltage compensation device 20 and the power distribution system 10. Secondly, by setting a current transformer to detect a current value of the neutral line, the controller 200 controls an impedance parameter of the zero sequence transformer according to the current value, and can adjust the impedance parameter to adapt to different power distribution systems 10, thereby ensuring reliable operation of the power distribution systems 10 and greatly improving the intelligence and practicality of the zero sequence voltage compensation device 20 and the power distribution systems 10.
The above description is only of the preferred embodiments of the present invention and is not intended to limit the present invention, but various modifications and variations can be made to the present invention by those skilled in the art. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (8)
1. A zero sequence voltage compensation device applied to a power distribution system, wherein the power distribution system comprises a three-phase power supply, a load and a neutral line, the zero sequence voltage compensation device comprises a voltage compensation circuit for outputting compensation voltage to the power distribution system and a controller for controlling the phase and amplitude of the compensation voltage according to the current working voltage and working current of the power distribution system;
the input end of the voltage compensation circuit and the first end of the load are respectively connected with the three-phase power supply, the first output end and the second output end of the voltage compensation circuit are respectively connected with the second end of the load and the neutral line, the input end of the controller is connected with the first end of the load, and the output end of the controller is connected with the control end of the voltage compensation circuit;
the voltage compensation circuit comprises a rectifying circuit, an inverter circuit and an output circuit;
the input end of the rectifying circuit is connected with the three-phase power supply, the output end of the rectifying circuit is connected with the input end of the inverter circuit, the output end of the inverter circuit is connected with the input end of the output circuit, the control end of the inverter circuit is connected with the output end of the controller, and the first output end and the second output end of the output circuit are respectively connected with the second end of the load and the neutral line;
the output circuit comprises a zero sequence transformer, a primary coil of the zero sequence transformer is connected with the output end of the inverter circuit, and two ends of a secondary coil are respectively connected with the second end of the load and the neutral line;
the voltage compensation circuit further comprises a current transformer, wherein the current transformer is arranged between a first output end of the output circuit and a second end of the load and is connected with an input end of the controller; the current transformer is used for detecting a current value of a neutral line of the power distribution system and sending the current value to the controller, and the controller is used for adjusting impedance parameters of the zero sequence transformer according to the current value so as to control the compensation voltage.
2. The zero sequence voltage compensation device according to claim 1, characterized in that the voltage compensation circuit further comprises a first filter circuit, which is arranged between the output of the rectifying circuit and the input of the inverting circuit.
3. The zero sequence voltage compensation device according to claim 2, wherein the voltage compensation circuit further comprises an overvoltage detection circuit and an overvoltage protection circuit which are arranged in a correlated manner, two ends of the overvoltage detection circuit are respectively connected with a first output end and a second output end of the output circuit, and the overvoltage protection circuit is arranged between the output end of the first filter circuit and the input end of the inverter circuit;
the overvoltage detection circuit is used for detecting whether the zero sequence voltage of the power distribution system exceeds a preset voltage, and the overvoltage protection circuit is used for cutting off power supply to the inverter circuit when the zero sequence voltage of the power distribution system exceeds the preset voltage so that the output circuit outputs uncompensated voltage.
4. The zero sequence voltage compensation arrangement according to claim 1 or 2, characterized in that the voltage compensation circuit further comprises a second filter circuit, which is arranged between the output of the inverter circuit and the input of the output circuit.
5. The zero sequence voltage compensation device according to claim 1, characterized in that the voltage compensation circuit further comprises a current transformer arranged between a secondary winding of the zero sequence transformer and the second end of the load and connected to an input of the controller;
the current transformer is used for detecting a current value of a neutral line of the power distribution system and sending the current value to the controller, and the controller is used for adjusting impedance parameters of the zero sequence transformer according to the current value so as to control the compensation voltage.
6. The zero sequence voltage compensation device according to claim 5, characterized in that the zero sequence transformer comprises a first core provided with the primary winding and the secondary winding, a second core provided with a trip member, and an elastic member for connecting the first core and the second core;
the controller can control the relative position relation of the first iron core and the second iron core through the matching arrangement of the tripping component and the elastic component so as to adjust the impedance parameter of the zero sequence transformer.
7. A power distribution system comprising a three-phase power supply, a load, a neutral line and a zero sequence voltage compensation device according to any one of claims 1-6, the zero sequence voltage compensation device comprising a voltage compensation circuit for outputting a compensation voltage to the power distribution system and a controller for controlling the phase and amplitude of the compensation voltage in dependence on the current operating voltage and operating current of the power distribution system;
the input end of the voltage compensation circuit and the first end of the load are respectively connected with the three-phase power supply, the first output end and the second output end of the voltage compensation circuit are respectively connected with the second end of the load and the neutral line, the input end of the controller is connected with the first end of the load, and the output end of the controller is connected with the control end of the voltage compensation circuit;
the output circuit comprises a zero sequence transformer, a primary coil of the zero sequence transformer is connected with the output end of the inverter circuit, and two ends of a secondary coil are respectively connected with the second end of the load and the neutral line;
the voltage compensation circuit further comprises a current transformer, wherein the current transformer is arranged between a first output end of the output circuit and a second end of the load and is connected with an input end of the controller; the current transformer is used for detecting a current value of a neutral line of the power distribution system and sending the current value to the controller, and the controller is used for adjusting impedance parameters of the zero sequence transformer according to the current value so as to control the compensation voltage.
8. The power distribution system of claim 7, wherein the power distribution system is a three-phase four-wire system, the loads including a first load, a second load, and a third load disposed in each phase of the circuit, respectively;
a first end of the first load the first end of the second load and the first end of the third load are respectively connected with a three-phase power supply and are respectively connected with three input ends of the voltage compensation circuit, the second end of the first load, the second end of the second load and the second end of the third load are connected and then connected with the neutral line through the voltage compensation circuit.
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Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2005287192A (en) * | 2004-03-30 | 2005-10-13 | Mitsubishi Electric Corp | Switching unit |
| CN101699692A (en) * | 2009-11-09 | 2010-04-28 | 西安工程大学 | Series connection type voltage transient variation compensation control circuit and control method |
| CN104135012A (en) * | 2014-08-20 | 2014-11-05 | 国家电网公司 | Intelligent electric meter having function of compensating for user alternating voltage amplitude |
-
2017
- 2017-06-12 CN CN201710436756.4A patent/CN107026454B/en active Active
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2005287192A (en) * | 2004-03-30 | 2005-10-13 | Mitsubishi Electric Corp | Switching unit |
| CN101699692A (en) * | 2009-11-09 | 2010-04-28 | 西安工程大学 | Series connection type voltage transient variation compensation control circuit and control method |
| CN104135012A (en) * | 2014-08-20 | 2014-11-05 | 国家电网公司 | Intelligent electric meter having function of compensating for user alternating voltage amplitude |
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| CN107026454A (en) | 2017-08-08 |
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