CN111884238A - Electric energy quality treatment device of low-voltage distribution network - Google Patents
Electric energy quality treatment device of low-voltage distribution network Download PDFInfo
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- CN111884238A CN111884238A CN202010777368.4A CN202010777368A CN111884238A CN 111884238 A CN111884238 A CN 111884238A CN 202010777368 A CN202010777368 A CN 202010777368A CN 111884238 A CN111884238 A CN 111884238A
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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
Abstract
The application discloses electric energy quality of low voltage distribution network administers device, the device include device controller, unbalanced three phase treatment equipment. The device controller is used for collecting the network side current of the low-voltage distribution network and outputting an unbalance treatment instruction; the three-phase unbalance treatment equipment has a multi-level topological structure, is connected with three-phase electricity of the voltage distribution network in parallel, and is used for treating three-phase unbalance of the low-voltage distribution network according to the unbalance treatment instruction. The three-phase unbalance of the low-voltage distribution network is treated, so that the three phases of the power grid can be balanced, the neutral line passing current after the balance is very small and close to zero, and the damage of a power grid circuit is reduced.
Description
Technical Field
The application relates to the technical field of power grids, more specifically to a device is administered to electric energy quality of low voltage distribution network.
Background
The problem of the electric energy quality of a low-voltage distribution network mainly lies in three-phase imbalance, the existing low-voltage distribution network mainly operates in a three-phase four-wire system, and when the three phases are unbalanced, a neutral wire can pass current, so that not only phase wires are damaged, but also the neutral wire generates loss at the same time, and the loss of a power grid line is increased.
Disclosure of Invention
In view of this, this application provides a device is administered to electric energy quality of low voltage distribution network for administer three-phase unbalance, in order to reduce the damage of electric wire netting circuit.
In order to achieve the above object, the following solutions are proposed:
the utility model provides a device is administered to electric energy quality of low voltage distribution network, includes device controller, unbalanced three-phase treatment equipment, wherein:
the device controller is used for collecting the network side current of the low-voltage distribution network and outputting an unbalance treatment instruction;
the three-phase imbalance treatment equipment has a multi-level topological structure, is connected with the three-phase electricity of the voltage distribution network in parallel, and is used for treating the three-phase imbalance of the low-voltage distribution network according to the imbalance treatment instruction.
Optionally, the three-phase imbalance treatment device includes an instruction current operation circuit, a current tracking control circuit, a driving circuit, and a main circuit.
Optionally, the main circuit includes three bridge arms, and each bridge arm includes at least two IGBT elements.
Optionally, the system further comprises a reactive compensation capacitor bank connected in parallel with the low-voltage distribution network, wherein:
and the reactive compensation capacitor bank is used for compensating the reactive power of the low-voltage distribution network according to the first compensation instruction output by the device controller.
Optionally, the reactive compensation capacitor bank is a co-compensation capacitor bank, a sub-compensation capacitor bank, or an inter-phase cross-over capacitor bank.
Optionally, the device controller is provided with a communication module, wherein:
the communication module is used for receiving a second compensation instruction of the upper computer, and the second compensation instruction is used for controlling the reactive compensation capacitor bank to carry out multi-stage joint debugging.
According to the technical scheme, the application discloses a device for treating the electric energy quality of a low-voltage distribution network, which comprises a device controller and three-phase unbalance treatment equipment. The device controller is used for collecting the network side current of the low-voltage distribution network and outputting an unbalance treatment instruction; the three-phase unbalance treatment equipment has a multi-level topological structure, is connected with three-phase electricity of the voltage distribution network in parallel, and is used for treating three-phase unbalance of the low-voltage distribution network according to the unbalance treatment instruction. The three-phase unbalance of the low-voltage distribution network is treated, so that the three phases of the power grid can be balanced, the neutral line passing current after the balance is very small and close to zero, and the damage of a power grid circuit is reduced.
Drawings
In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present application, and for those skilled in the art, other drawings can be obtained according to the drawings without creative efforts.
Fig. 1 is a schematic diagram of an electric energy quality control device of a low-voltage distribution network according to an embodiment of the present application;
fig. 2 is a schematic diagram of another power quality control device for a low-voltage distribution network according to an embodiment of the present application;
fig. 3 is a schematic diagram of another power quality control device for a low-voltage distribution network according to an embodiment of the present application.
Detailed Description
The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application, and it is obvious that the described embodiments are only a part of the embodiments of the present application, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present application.
Example one
Fig. 1 is a schematic diagram of an electric energy quality control device of a low-voltage distribution network according to an embodiment of the present application.
As shown in fig. 1, the power quality control device provided in this embodiment is applied to a low-voltage distribution network, the low-voltage distribution network adopts a three-wire four-wire system, that is, three phase wires and a neutral wire, and the power quality control device is connected to the four wires. The apparatus specifically includes an apparatus controller 10 and a three-phase imbalance abatement device 20.
The device controller adopts a high-speed 32-bit ARM core CPU and an embedded Linux operating system, uses alternating current three-phase four-wire power supply, is designed with a wide voltage working range, and can maintain work and communication under the condition that a terminal is arbitrarily disconnected with one-phase or two-phase voltage.
The device controller is used for collecting phase voltage of each phase through a voltage transformer, collecting phase current of each phase through a current transformer and collecting zero sequence current of a neutral wire. And after phase voltage, phase current and zero sequence current are collected, whether the three phases of the low-voltage distribution network are balanced or not is determined through calculation, and if the three phases are not balanced, the specific numerical value of the unbalance and unbalance caused by the phases is also determined. And after determining the three-phase imbalance of the low-voltage distribution network, outputting an imbalance treatment instruction to the three-phase imbalance treatment equipment according to the actual imbalance condition.
The three-phase unbalance treatment equipment is in signal connection with the controller of the device, and simultaneously, a main circuit of the three-phase unbalance treatment equipment is connected with a low-voltage distribution network in parallel. The three-phase unbalance treatment device has a multi-level topology structure, and executes unbalance treatment on the low-voltage distribution network after receiving the unbalance treatment instruction, namely, the three phases become balanced.
The three-phase imbalance treatment device specifically comprises an instruction current operation circuit 21, a current tracking control circuit 22, a driving circuit 23 and a main circuit 24, which are specifically shown in fig. 2. Specifically, when the current tracking control circuit is executed, the current tracking control circuit is used for detecting the electric energy condition of the load of the power grid, and the current instruction required by actual compensation is calculated according to the electric energy condition by using the instruction current operation circuit. The driving circuit drives the main circuit to operate according to the current instruction, so that the main circuit outputs the actually required compensation current. The main circuit works under the drive of the drive circuit and outputs the compensation current.
In order to ensure the operation speed and the anti-interference capability of the equipment, a 3DSP + CPLD chip is adopted in the control circuit. In addition, the main circuit comprises three bridge arms, and each bridge arm comprises two IGBT elements.
According to the technical scheme, the electric energy quality treatment device for the low-voltage distribution network comprises a device controller and three-phase unbalance treatment equipment. The device controller is used for collecting the network side current of the low-voltage distribution network and outputting an unbalance treatment instruction; the three-phase unbalance treatment equipment has a multi-level topological structure, is connected with three-phase electricity of the voltage distribution network in parallel, and is used for treating three-phase unbalance of the low-voltage distribution network according to the unbalance treatment instruction. The three-phase unbalance of the low-voltage distribution network is treated, so that the three phases of the power grid can be balanced, the neutral line passing current after the balance is very small and close to zero, and the damage of a power grid circuit is reduced.
The functions of negative sequence unbalance treatment, reactive compensation, harmonic elimination and the like of active and reactive power are realized by independently controlling each bridge arm.
Example two
Fig. 3 is a schematic diagram of another power quality control device for a low-voltage distribution network according to an embodiment of the present application.
As shown in fig. 3, the power quality management device provided in this embodiment is added with a reactive compensation capacitor bank 30 on the basis of the previous embodiment.
The reactive compensation capacitor bank comprises a plurality of groups of compensation capacitors, each group of compensation capacitors is connected with the low-voltage distribution network in parallel, and when the device controller outputs a first compensation instruction, the reactive compensation capacitors compensate the reactive power of the low-voltage distribution network. The reactive compensation capacitor bank can be a co-compensation capacitor bank, a sub-compensation capacitor bank or an interphase bridging capacitor bank.
The reactive compensation capacitor bank adopts the compound switch to realize zero-crossing switching of the capacitor, reduces action impact current and prolongs the service life of the device.
In addition, the device controller in this application is provided with communication module, can realize communication through wired or wireless mode and platform district to can realize long-range information acquisition and the control to the reactive compensation capacitor bank, when receiving the second compensation instruction in platform district, can realize multistage joint debugging.
The embodiments in the present specification are described in a progressive manner, each embodiment focuses on differences from other embodiments, and the same and similar parts among the embodiments are referred to each other.
While preferred embodiments of the present invention have been described, additional variations and modifications of these embodiments may occur to those skilled in the art once they learn of the basic inventive concepts. Therefore, it is intended that the appended claims be interpreted as including preferred embodiments and all such alterations and modifications as fall within the scope of the embodiments of the invention.
Finally, it should also be noted that, herein, relational terms such as first and second, and the like may be used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Also, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or terminal that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or terminal. Without further limitation, an element defined by the phrase "comprising an … …" does not exclude the presence of other like elements in a process, method, article, or terminal that comprises the element.
The technical solutions provided by the present invention are described in detail above, and the principle and the implementation of the present invention are explained in this document by applying specific examples, and the descriptions of the above examples are only used to help understanding the method and the core idea of the present invention; meanwhile, for a person skilled in the art, according to the idea of the present invention, there may be variations in the specific embodiments and the application scope, and in summary, the content of the present specification should not be construed as a limitation to the present invention.
Claims (6)
1. The utility model provides a device is administered to electric energy quality of low voltage distribution network which characterized in that, includes device controller, unbalanced three phase treatment equipment, wherein:
the device controller is used for collecting the network side current of the low-voltage distribution network and outputting an unbalance treatment instruction;
the three-phase imbalance treatment equipment has a multi-level topological structure, is connected with the three-phase electricity of the voltage distribution network in parallel, and is used for treating the three-phase imbalance of the low-voltage distribution network according to the imbalance treatment instruction.
2. The power quality governance device of claim 1 wherein the three-phase imbalance governance apparatus comprises a commanded current arithmetic circuit, a current tracking control circuit, a drive circuit and a main circuit.
3. The power quality management device according to claim 1, wherein the main circuit comprises three legs, each of the legs comprising at least two IGBT elements.
4. The electric energy quality control device according to any one of claims 1 to 3, further comprising a reactive compensation capacitor bank connected in parallel with the low voltage distribution network, wherein:
and the reactive compensation capacitor bank is used for compensating the reactive power of the low-voltage distribution network according to the first compensation instruction output by the device controller.
5. The power quality management apparatus of claim 4, wherein the reactive compensation capacitor bank is a co-compensation capacitor bank, a sub-compensation capacitor bank, or an interphase jumper capacitor bank.
6. The power quality remediation device of claim 4 wherein the device controller is provided with a communication module, wherein:
the communication module is used for receiving a second compensation instruction of the upper computer, and the second compensation instruction is used for controlling the reactive compensation capacitor bank to carry out multi-stage joint debugging.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202010777368.4A CN111884238A (en) | 2020-08-05 | 2020-08-05 | Electric energy quality treatment device of low-voltage distribution network |
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| CN202010777368.4A CN111884238A (en) | 2020-08-05 | 2020-08-05 | Electric energy quality treatment device of low-voltage distribution network |
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Citations (5)
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| CN205753433U (en) * | 2016-05-17 | 2016-11-30 | 天津市三源电力设备制造有限公司 | It is applied to the device administering three-phase imbalance of low-voltage distribution network |
| CN106385041A (en) * | 2016-11-09 | 2017-02-08 | 株洲变流技术国家工程研究中心有限公司 | Three-grade low-voltage power distribution network voltage control device and control method thereof |
| CN207625296U (en) * | 2017-11-20 | 2018-07-17 | 广东正诚电气科技有限公司 | A kind of active and passive combination power load three-phase imbalance regulating device |
| CN108321815A (en) * | 2018-03-08 | 2018-07-24 | 西安爱科赛博电气股份有限公司 | A kind of low-voltage network utility power quality control system and method |
| CN109510223A (en) * | 2018-12-14 | 2019-03-22 | 山东鲁能智能技术有限公司 | A kind of three-phase current unbalance administers controller, device and control method |
-
2020
- 2020-08-05 CN CN202010777368.4A patent/CN111884238A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN205753433U (en) * | 2016-05-17 | 2016-11-30 | 天津市三源电力设备制造有限公司 | It is applied to the device administering three-phase imbalance of low-voltage distribution network |
| CN106385041A (en) * | 2016-11-09 | 2017-02-08 | 株洲变流技术国家工程研究中心有限公司 | Three-grade low-voltage power distribution network voltage control device and control method thereof |
| CN207625296U (en) * | 2017-11-20 | 2018-07-17 | 广东正诚电气科技有限公司 | A kind of active and passive combination power load three-phase imbalance regulating device |
| CN108321815A (en) * | 2018-03-08 | 2018-07-24 | 西安爱科赛博电气股份有限公司 | A kind of low-voltage network utility power quality control system and method |
| CN109510223A (en) * | 2018-12-14 | 2019-03-22 | 山东鲁能智能技术有限公司 | A kind of three-phase current unbalance administers controller, device and control method |
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Application publication date: 20201103 |