CN212969064U - Unbalanced three phase governing system - Google Patents
Unbalanced three phase governing system Download PDFInfo
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- CN212969064U CN212969064U CN202021579595.8U CN202021579595U CN212969064U CN 212969064 U CN212969064 U CN 212969064U CN 202021579595 U CN202021579595 U CN 202021579595U CN 212969064 U CN212969064 U CN 212969064U
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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 utility model relates to a three-phase unbalance adjusting system, which comprises a three-phase electric quantity instrument, a controller, a commutation switch and a SVG reactive power compensation device; the input end of the three-phase electric meter is respectively connected to A, B and C three phases of three-phase electricity, and the output end of the three-phase electric meter is connected with the data input end of the controller; the phase change switch comprises three composite switch tubes, each composite switch tube is formed by connecting a thyristor and a magnetic latching relay in parallel, and a load is connected to A, B of three-phase power and C of three-phase power respectively through the three composite switch tubes in the phase change switch; the SVG reactive power compensation device is connected to A, B and C three phases of three-phase power; the control output end of the controller is connected with the phase change switch, and the control output end of the controller is also connected with the SVG static var compensator. The utility model discloses can be full-automatic, thorough adjustment unbalanced three phase problem, and the adjustment in-process does not cut off the power supply, realizes seamless switching phase.
Description
Technical Field
The utility model relates to a power supply adjusting device, concretely relates to unbalanced three phase governing system.
Background
For the problem of three-phase load imbalance of a distribution network, the existing solution method comprises two methods of manual adjustment and equipment adjustment. The manual adjustment method comprises the following steps: the current value (load) of each district of distribution network is joined in marriage in the inquiry by maintainer from intelligent distribution network monitoring platform, when discovering load unbalance, cuts off load (power failure) earlier, then the manual work pole climbing operation, demolishs the original joint of load downlead and overlap joint to the other looks that the load is lighter, resumes the power supply at last. The equipment adjusting method is automatically adjusted through a JP cabinet (cabinet integrated power distribution cabinet), and the JP cabinet is used as a standardized small-sized outdoor low-voltage power distribution device, is mainly suitable for low-voltage power distribution systems of urban networks, rural networks and the like, and has multiple functions of power distribution, protection, electric energy metering, reactive compensation and the like. However, manual adjustment is troublesome, manpower is wasted, efficiency is low, and power can be cut off in the adjustment process; and when the unbalanced three phase degree was higher, the unable thorough unbalanced three phase problem of adjustment of JP cabinet can't satisfy more and more complicated electric wire netting structure.
SUMMERY OF THE UTILITY MODEL
The utility model aims to solve the technical problem that an unbalanced three phase governing system is provided, can full-automatic, thorough adjustment unbalanced three phase problem, and the adjustment in-process does not cut off the power supply, realizes seamless commutation.
The utility model provides an above-mentioned technical problem's technical scheme as follows: a three-phase unbalance adjusting system comprises a three-phase electric meter, a controller, a phase change switch and an SVG reactive power compensation device; the input end of the three-phase electric meter is respectively connected to A, B and C three phases of three-phase electricity, and the output end of the three-phase electric meter is connected with the data input end of the controller; the phase change switch comprises three composite switch tubes, each composite switch tube is formed by connecting a thyristor and a magnetic latching relay in parallel, and a load is connected to A, B of three-phase power and C of three-phase power respectively through the three composite switch tubes in the phase change switch; the SVG reactive power compensation device is connected to A, B and C three phases of three-phase power; the control output end of the controller is connected with the phase change switch, and the control output end of the controller is also connected with the SVG static var compensator.
On the basis of the technical scheme, the utility model discloses can also do following improvement.
Further, the three-phase electric meter comprises three current transformers, the input ends of the three current transformers are respectively connected to A, B and C phases of three-phase electricity, and the output ends of the three current transformers are connected with the data input end of the controller.
The controller comprises three current transformers, and the output ends of every two of the three current transformers are connected with one I/O interface of the controller through one corresponding comparator.
Further, the thyristor is a unidirectional thyristor.
Furthermore, the topological structure of the SVG reactive power compensation device comprises a voltage type three-phase bridge inverter circuit and an energy storage circuit, wherein the energy storage circuit comprises two groups of direct current capacitor sets and two voltage-sharing resistors, the two groups of direct current capacitor sets are connected to two ends of the voltage type three-phase bridge inverter circuit in series, two ends of each group of direct current capacitor sets are respectively connected with one voltage-sharing resistor in parallel, and each group of direct current capacitor sets is respectively formed by connecting a plurality of direct current capacitors with the same size and capacity in parallel; and the common ends of the two groups of direct current capacitor groups are connected to a zero line, and the common end of each phase in the three-phase bridge type inverter circuit is correspondingly connected to A, B and C three phases of three-phase power through corresponding inductors.
The utility model has the advantages that: the utility model measures the electric parameters of each phase in the three-phase electricity by the three-phase electric measuring instrument, and judges whether the three-phase unbalance problem and the unbalance degree exist in the power grid or not by comparison; if the three-phase unbalance exists, the controller controls the on-off of the phase change switch based on the unbalance degree, the load can be switched from a phase with high current to a phase with low current, the rough adjustment of the three-phase unbalance is realized, in the rough adjustment process, the high-power reliability of the magnetic latching relay is combined by utilizing the quick zero-crossing characteristic of the thyristor, and the controller controls the on-off, so that the seamless switching process is realized; and measuring the electric parameters of each phase in the three-phase power by the three-phase electric meter again, judging whether the three-phase imbalance problem and the imbalance degree exist in the power grid or not by comparison, and if so, controlling the SVG reactive power compensation device to realize the accurate adjustment of the three-phase imbalance by the controller based on the imbalance degree. Therefore the utility model discloses can be full-automatic, thorough adjustment unbalanced three phase problem, and the adjustment in-process does not cut off the power supply, realizes seamless commutation phase.
Drawings
Fig. 1 is a schematic view of an overall structure of a three-phase imbalance adjustment system according to the present invention;
fig. 2 is a topological diagram of the SVG reactive power compensation device.
Detailed Description
The principles and features of the present invention are described below in conjunction with the following drawings, the examples given are only intended to illustrate the present invention and are not intended to limit the scope of the present invention.
As shown in fig. 1, a three-phase imbalance adjusting system includes a three-phase electric meter, a controller, a phase-change switch and an SVG reactive power compensation device; the input end of the three-phase electric meter is respectively connected to A, B and C three phases of three-phase electricity, and the output end of the three-phase electric meter is connected with the data input end of the controller; the phase change switch comprises three composite switch tubes, each composite switch tube is formed by connecting a thyristor and a magnetic latching relay in parallel, and a load is connected to A, B of three-phase power and C of three-phase power respectively through the three composite switch tubes in the phase change switch; the SVG reactive power compensation device is connected to A, B and C three phases of three-phase power; the control output end of the controller is connected with the phase change switch, and the control output end of the controller is also connected with the SVG static var compensator.
In this particular real-time example:
the three-phase electric meter comprises three current transformers, the input ends of the three current transformers are respectively connected to A, B and C phases of three-phase electricity, and the output ends of the three current transformers are connected with the data input end of the controller.
The utility model discloses still include the comparator, the comparator is equipped with threely, three per two among the current transformer's output is through a correspondence the comparator with an IO interface connection of controller.
The thyristor is a unidirectional thyristor.
As shown in fig. 2, the topological structure of the SVG reactive power compensation device includes a voltage-type three-phase bridge inverter circuit and an energy storage circuit, where the energy storage circuit includes two groups of dc capacitor sets and two voltage-sharing resistors, the two groups of dc capacitor sets are connected in series at two ends of the voltage-type three-phase bridge inverter circuit, two ends of each group of dc capacitor sets are respectively connected in parallel with one voltage-sharing resistor, and each group of dc capacitor sets is respectively composed of a plurality of dc capacitors with the same size and capacity in parallel; and the common ends of the two groups of direct current capacitor groups are connected to a zero line, and the common end of each phase in the three-phase bridge type inverter circuit is correspondingly connected to A, B and C three phases of three-phase power through corresponding inductors.
The utility model measures the electric parameters of each phase in the three-phase electricity by the three-phase electric measuring instrument, and judges whether the three-phase unbalance problem and the unbalance degree exist in the power grid or not by comparison; if the three-phase unbalance exists, the controller controls the on-off of the phase change switch based on the unbalance degree, the load can be switched from a phase with high current to a phase with low current, the rough adjustment of the three-phase unbalance is realized, in the rough adjustment process, the high-power reliability of the magnetic latching relay is combined by utilizing the quick zero-crossing characteristic of the thyristor, and the controller controls the on-off, so that the seamless switching process is realized; and measuring the electric parameters of each phase in the three-phase power by the three-phase electric meter again, judging whether the three-phase imbalance problem and the imbalance degree exist in the power grid or not by comparison, and if so, controlling the SVG reactive power compensation device to realize the accurate adjustment of the three-phase imbalance by the controller based on the imbalance degree. Therefore the utility model discloses can be full-automatic, thorough adjustment unbalanced three phase problem, and the adjustment in-process does not cut off the power supply, realizes seamless commutation phase.
The above description is only for the preferred embodiment of the present invention, and is not intended to limit the present invention, and any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present invention should be included within the protection scope of the present invention.
Claims (5)
1. A three-phase imbalance adjustment system, comprising: the system comprises a three-phase electric meter, a controller, a phase change switch and an SVG reactive power compensation device; the input end of the three-phase electric meter is respectively connected to A, B and C three phases of three-phase electricity, and the output end of the three-phase electric meter is connected with the data input end of the controller; the phase change switch comprises three composite switch tubes, each composite switch tube is formed by connecting a thyristor and a magnetic latching relay in parallel, and a load is connected to A, B of three-phase power and C of three-phase power respectively through the three composite switch tubes in the phase change switch; the SVG reactive power compensation device is connected to A, B and C three phases of three-phase power; the control output end of the controller is connected with the phase change switch, and the control output end of the controller is further connected with the SVG reactive power compensation device.
2. The three-phase imbalance adjustment system of claim 1, wherein: the three-phase electric meter comprises three current transformers, the input ends of the three current transformers are respectively connected to A, B and C phases of three-phase electricity, and the output ends of the three current transformers are connected with the data input end of the controller.
3. The three-phase imbalance adjustment system of claim 2, wherein: the controller is characterized by further comprising three comparators, wherein the output ends of every two of the three current transformers are connected with one I/O interface of the controller through one corresponding comparator.
4. A three-phase unbalance adjustment system according to any one of claims 1 to 3, wherein: the thyristor is a unidirectional thyristor.
5. A three-phase unbalance adjustment system according to any one of claims 1 to 3, wherein: the topological structure of the SVG reactive power compensation device comprises a voltage type three-phase bridge inverter circuit and an energy storage circuit, wherein the energy storage circuit comprises two groups of direct current capacitor banks and two voltage-sharing resistors, the two groups of direct current capacitor banks are connected to two ends of the voltage type three-phase bridge inverter circuit in series, two ends of each group of direct current capacitor banks are respectively connected with one voltage-sharing resistor in parallel, and each group of direct current capacitor banks is respectively formed by connecting a plurality of direct current capacitors with the same size and capacity in parallel; and the common ends of the two groups of direct current capacitor groups are connected to a zero line, and the common end of each phase in the three-phase bridge type inverter circuit is correspondingly connected to A, B and C three phases of three-phase power through corresponding inductors.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202021579595.8U CN212969064U (en) | 2020-08-03 | 2020-08-03 | Unbalanced three phase governing system |
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| CN202021579595.8U CN212969064U (en) | 2020-08-03 | 2020-08-03 | Unbalanced three phase governing system |
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| CN212969064U true CN212969064U (en) | 2021-04-13 |
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