CN111342466B - Distributed three-phase imbalance and harmonic wave treatment device and method - Google Patents
Distributed three-phase imbalance and harmonic wave treatment device and method Download PDFInfo
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- CN111342466B CN111342466B CN202010187159.4A CN202010187159A CN111342466B CN 111342466 B CN111342466 B CN 111342466B CN 202010187159 A CN202010187159 A CN 202010187159A CN 111342466 B CN111342466 B CN 111342466B
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- 238000005067 remediation Methods 0.000 claims 3
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Classifications
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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
- H02J3/01—Arrangements for reducing harmonics or ripples
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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
- H02J13/00—Circuit arrangements for providing remote indication of network conditions, e.g. an instantaneous record of the open or closed condition of each circuitbreaker in the network; Circuit arrangements for providing remote control of switching means in a power distribution network, e.g. switching in and out of current consumers by using a pulse code signal carried by the network
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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
- H02J3/1835—Arrangements for adjusting, eliminating or compensating reactive power in networks using shunt compensators with stepless control
- H02J3/1842—Arrangements for adjusting, eliminating or compensating reactive power in networks using shunt compensators with stepless control wherein at least one reactive element is actively controlled by a bridge converter, e.g. active filters
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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
- Y02E40/20—Active power filtering [APF]
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E40/00—Technologies for an efficient electrical power generation, transmission or distribution
- Y02E40/30—Reactive power compensation
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- 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
- Y02E40/40—Arrangements for reducing harmonics
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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
-
- 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
- Y02E40/70—Smart grids as climate change mitigation technology in the energy generation sector
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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
- Y04—INFORMATION OR COMMUNICATION TECHNOLOGIES HAVING AN IMPACT ON OTHER TECHNOLOGY AREAS
- Y04S—SYSTEMS INTEGRATING TECHNOLOGIES RELATED TO POWER NETWORK OPERATION, COMMUNICATION OR INFORMATION TECHNOLOGIES FOR IMPROVING THE ELECTRICAL POWER GENERATION, TRANSMISSION, DISTRIBUTION, MANAGEMENT OR USAGE, i.e. SMART GRIDS
- Y04S10/00—Systems supporting electrical power generation, transmission or distribution
- Y04S10/50—Systems or methods supporting the power network operation or management, involving a certain degree of interaction with the load-side end user applications
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- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Supply And Distribution Of Alternating Current (AREA)
Abstract
The invention discloses a distributed three-phase imbalance and harmonic wave treatment device and method, the technical scheme is as follows: the active filter comprises an active filter host connected to the outlet end of a transformer, wherein the outlet end of the transformer is connected with a plurality of distribution lines, and each distribution line is connected with a plurality of groups of active filter slaves and phase change switches which are connected in parallel; the active filter slave and the phase change switch are respectively connected with the active filter host through a communication bus, and the active filter host can receive the current values of all compensation nodes and coordinate and uniformly control all the phase change switches and the active filter slave. The active filter host coordinates and uniformly controls the actions of the active filters and the phase change switches of all compensation nodes, and the three-phase unbalance of the power distribution circuit is treated in a refined way; the active filter performs on-site compensation on the harmonic current of the distribution node, so that the line loss is effectively reduced; the three-phase unbalance and harmonic current control device has the advantages of high adjustment precision, small loss, low cost and good control effect on the three-phase unbalance and harmonic current of the distribution line.
Description
Technical Field
The invention belongs to the technical field of intelligent power distribution, and particularly relates to a distributed three-phase imbalance and harmonic wave treatment device and method.
Background
In urban and rural low-voltage distribution systems in China, a large number of single-phase and asymmetric loads exist, and a three-phase load system is randomly changed, so that the phenomenon of three-phase unbalance commonly exists in 10kV distribution transformer is caused; the nonlinear equipment such as energy-saving lamps, air conditioners, computers, various household appliances and the like is used in a large quantity, so that a large quantity of 3, 5 and 7-order harmonic waves are generated, the line loss is increased, the communication line is interfered, and the power grid is polluted. In particular, the 3 rd harmonic wave can cause excessive neutral current, serious heating and line paralysis possibly caused in serious conditions, so that the urban and rural power distribution system is very urgent to carry out three-phase imbalance and harmonic wave management.
The existing urban and rural distribution transformer areas mostly adopt a mode of treatment of phase change switches, centralized treatment of SVG (static var generators), SVG distribution treatment of SVG (static var generators) or treatment of SVG (static var generators) and phase change switches. The inventor finds that the phase change switch treatment mode has the advantages of small loss, low cost and the like, but has low adjustment precision and can not treat harmonic waves. The SVG centralized treatment mode and the distributed treatment mode of the static var generator have high compensation precision and good treatment effects on three-phase unbalance and harmonic waves, but the centralized treatment mode has large line loss of a distribution line, poor energy-saving effect and high cost of the distributed treatment mode. The treatment mode of combining the phase change switch and the static var generator SVG has good treatment effect and low cost, but the harmonic wave is intensively treated by the static var generator SVG, so that the line loss of the distribution line is large, and the energy-saving effect is general.
Disclosure of Invention
Aiming at the defects existing in the prior art, the invention aims to provide a distributed three-phase imbalance and harmonic wave treatment device and method, wherein an active filter host coordinates and uniformly controls the operation of each execution unit in the active filter host through a communication bus, so that the line loss is lower, the reliability of a system is improved, and the electric energy quality treatment requirement of a distribution area is met.
In order to achieve the above object, the present invention is realized by the following technical scheme:
in a first aspect, an embodiment of the present invention provides a distributed three-phase imbalance and harmonic suppression device, including an active filter host connected to an outlet end of a transformer, where the outlet end of the transformer is connected to a plurality of distribution lines, each distribution line being connected to a plurality of groups of active filter slaves and phase change switches connected in parallel with each other;
the active filter slave and the phase change switch are respectively connected with the active filter host through a communication bus, and the active filter host can receive the compensation node current values of each distribution line and coordinate and uniformly control each phase change switch and the active filter slave.
As a further implementation, the source filter master and the active filter slave are internally provided with wave blockers.
In a second aspect, an embodiment of the present invention further provides a distributed three-phase imbalance and harmonic suppression method, where the distributed three-phase imbalance and harmonic suppression apparatus includes:
each active filter slave machine samples the corresponding compensation node current and calculates a three-phase current value and a harmonic current;
the active filter host receives three-phase current values of each compensation node and analyzes the three-phase current unbalance degree of the three-phase current values;
the active filter host sends a commutation instruction to the commutation switch in each compensation node, and the commutation switch receives the commutation instruction and executes corresponding operation;
the active filter host sends three-phase unbalanced fine adjustment instructions to the active filter slaves of all the compensation nodes, and the active filter slaves execute corresponding operations after receiving the instructions;
after the active filter slave machine executes the instruction, the residual current opens the filtering function;
the active filter host samples a current signal of an outlet end of the transformer, and when the unbalance of the three-phase current exceeds a set threshold value, unbalance adjustment is carried out.
As a further implementation, the active filter host has a set time interval between sending the three-phase imbalance fine adjustment instruction and sending the commutation instruction.
The beneficial effects of the embodiment of the invention are as follows:
(1) According to one or more embodiments of the invention, the APF host coordinates and uniformly controls the APF slaves and the phase change switches of each compensation node to adjust the three-phase unbalanced current, so that the compensation precision is improved; one APF host can coordinate and control N distribution lines, and the number of APFs and phase change switches of each distribution line can be selected according to load conditions, so that the configuration is flexible;
(2) Each node APF of one or more embodiments of the invention starts a filtering function, compensates line harmonic on site, and reduces line loss; the source side current of each compensation node is uploaded to the APF host through the communication system, so that the calculation amount of the APF host is reduced, and the execution efficiency of the APF host is improved;
(3) In one or more embodiments of the present invention, since each APF slave compensation node realizes in-situ balancing, the average impedance of each section of three-phase line is fully utilized, so that the line loss is lower;
(4) According to one or more embodiments of the invention, when the current transformer of the APF slave compensation node of the N-1 is damaged, the system can calculate the real-time current of the N-1 node through the real-time values uploaded by the current transformers of the N node and the N-2 node, so that the system can be ensured to normally operate;
(5) According to one or more embodiments of the invention, the APF host machine enables the APF slave machine compensation node to achieve rough adjustment balance by controlling the phase change switch in the APF slave machine compensation node, so that the APF capacity in the compensation node can be small enough, and the cost is saved;
(6) The wave-blocking device is arranged in the active filter of one or more embodiments of the invention, which can eliminate high-frequency interference and improve communication reliability;
(7) The APF host of one or more embodiments of the invention detects the power distribution condition of the outlet end of the transformer and further treats the imbalance of three-phase current and harmonic current of the outlet end of the transformer; and the source side data and the running state of the equipment are uploaded to the upper computer, and the upper computer observes the running effect and the running state of the equipment in real time, so that the method is convenient and quick.
Drawings
The accompanying drawings, which are included to provide a further understanding of the invention and are incorporated in and constitute a part of this specification, illustrate embodiments of the invention and together with the description serve to explain the invention.
FIG. 1 is a schematic view of a first embodiment of the present invention;
FIG. 2 is a flow chart of an active filter slave program according to a second embodiment of the present invention;
fig. 3 is a flowchart of an active filter host program according to a second embodiment of the present invention.
Detailed Description
It should be noted that the following detailed description is illustrative and is intended to provide further explanation of the present application. Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs.
It is noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of example embodiments in accordance with the present application. As used herein, the singular is also intended to include the plural unless the context clearly indicates otherwise, and furthermore, it is to be understood that the terms "comprises" and/or "comprising" when used in this specification are taken to specify the presence of stated features, steps, operations, devices, components, and/or combinations thereof;
the terms "mounted," "connected," "secured," and the like in this application are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally formed; the terms are used herein to refer to any one of the following terms, including direct connection, indirect connection via an intermediary, internal connection between two elements, electrical connection, or interaction between two elements.
Embodiment one:
the embodiment provides a distributed three-phase imbalance and harmonic wave treatment device, as shown in fig. 1, which comprises 1 APF (active filter) host machine, a plurality of APF slave machines, a plurality of phase change switches, a communication bus, an upper computer, a wave blocker and a plurality of groups of current transformers, wherein the APF host machine is connected to a transformer outlet end, samples a transformer outlet end current signal, and further treats the three-phase imbalance and harmonic wave of the transformer outlet end.
The transformer outlet is connected with a plurality of distribution lines, and in this embodiment, the transformer outlet is connected with two distribution lines, namely, a distribution line I and a distribution line II. It can be understood that the outlet end of the transformer can be connected with three or more distribution lines, which is set according to the requirement. And the APF host is connected with a current transformer at the outlet end of the transformer. An APF host can coordinate and control N distribution lines, and the number of APF slaves and phase change switches of each distribution line can be selected according to load conditions.
As shown in fig. 1, the distribution line I is connected in parallel with a plurality of APF slaves and phase change switches, and the APF slaves and the phase change switches are arranged at intervals, and the APF slaves and the phase change switches between adjacent transformers are in a group, and each group comprises an APF and a plurality of phase change switches. The APF slave is connected to each compensation node of the distribution line I, and one side of the APF slave is connected with a load in parallel; the phase change switch is also connected with a load. And a current transformer is connected between the APF slave and the distribution line I.
Similarly, the distribution line II is connected in parallel with a plurality of APF slaves and phase change switches, and the arrangement modes of the APF slaves and the phase change switches are the same as those of the distribution line I, which will not be described herein.
Each APF slave and each phase change switch are respectively connected with the APF host through a communication bus so as to realize information interaction. The APF host is connected with the upper computer through the communication bus, and the upper computer monitors the equipment states of the APF slaves and the phase change switch in real time, and is convenient to monitor and patrol. Wave blockers are arranged in the APF master machine and the APF slave machine, so that high-frequency interference is avoided. Furthermore, the wave-blocking device is connected with the APF master machine and the APF slave machine in parallel.
In the embodiment, the principle of scattered sampling and centralized control is adopted, the APF slave machine samples the compensation node current, calculates the three-phase current value and the harmonic content, and uploads the three-phase current value to the APF host machine, so that the calculation amount of the APF host machine is reduced, and the response rate is improved.
After receiving the current values of the compensation nodes, the APF host analyzes the current unbalance of the compensation nodes, rapidly generates and issues execution instructions of the compensation node phase change switches and the APF slave, and coordinates and uniformly controls the compensation node phase change switches and the APF. The APF host computer exchanges data with the phase change switches of the compensation nodes and the APF through a communication bus; the APF host coordinates and uniformly controls the APF and the phase change switch of each compensation node, the phase change switch executes rough adjustment, the APF is finely adjusted, the compensation precision is high, and the operation is reliable. The APF host samples the current signal of the outlet end of the transformer, and further treats the three-phase unbalance and harmonic wave of the outlet end of the transformer.
Embodiment two:
the embodiment provides a distributed three-phase imbalance and harmonic wave treatment method, as shown in fig. 2 and 3, adopting the distributed three-phase imbalance and harmonic wave treatment device according to the first embodiment, comprising the following steps:
the APF slave machine samples the three-phase current and the three-phase voltage of the compensation node, and calculates the three-phase current and the harmonic current of the compensation node; the APF slave uploads the three-phase current to the APF master over the communication bus.
And the APF host acquires real-time data of the three-phase current at the output side of the transformer, and when the unbalance degree of the three-phase current exceeds a set threshold value, the unbalance degree is adjusted.
The APF host receives three-phase current values of all compensation nodes through a communication bus, sequentially sequences the acquired values from small current to large current, namely, determines the sequence of the APF slave compensation nodes, sequentially performs subtraction operation of large current reduction current on each adjacent compensation node, and calculates the actual load current in each APF slave compensation node.
The APF host calculates the current unbalance degree which does not contain APF output by calculating the load current in each APF compensation node and then deducting the unbalanced current of the APF compensation, and the APF host enables the APF slave compensation nodes to achieve rough adjustment balance by controlling a phase change switch in the APF slave compensation nodes, and the rest unbalanced current is issued by the host to instruct to control the APF output, so that the load current of each APF slave compensation node is basically balanced.
After each compensation node APF executes the three-phase unbalanced fine adjustment instruction, the residual current starts a filtering function and locally compensates the load harmonic current. Meanwhile, the APF host samples a current signal at the outlet end of the distribution transformer to compensate three-phase unbalance and harmonic waves of the current at the source side of the distribution system.
And each compensation node APF slave and each phase change switch upload the state of the APF slave to the APF host through the communication bus, and the APF host uploads the state of the APF slave and the state of the compensation node APF and the state of the phase change switch to the upper computer.
The foregoing description is only of the preferred embodiments of the present application and is not intended to limit the same, but rather, various modifications and variations may be made by those skilled in the art. Any modification, equivalent replacement, improvement, etc. made within the spirit and principles of the present application should be included in the protection scope of the present application.
Claims (8)
1. The distributed three-phase imbalance and harmonic wave treatment device is characterized by comprising an active filter host connected to the outlet end of a transformer, wherein the outlet end of the transformer is connected with a plurality of distribution lines, and each distribution line is connected with a plurality of groups of active filter slaves and phase change switches which are connected in parallel;
the active filter slave and the phase change switch are respectively connected with the active filter host through a communication bus, and the active filter host can receive the current value of each compensation node and coordinate and uniformly control each phase change switch and the active filter slave;
the APF slave machine samples the compensation node current and calculates the three-phase current value and the harmonic content by adopting the principles of scattered sampling and centralized control, and uploads the three-phase current value to the APF host machine, so that the calculation amount of the APF host machine is reduced, and the response rate is improved;
after receiving the current values of the compensation nodes, the APF host analyzes the current unbalance of the compensation nodes, rapidly generates and issues execution instructions of the compensation node phase change switches and the APF slave, and coordinates and uniformly controls the compensation node phase change switches and the APF; the APF host computer exchanges data with the phase change switches of the compensation nodes and the APF through a communication bus; the APF host coordinates and uniformly controls the APF and the phase change switch of each compensation node, the phase change switch executes rough adjustment, the APF is finely adjusted, the compensation precision is high, and the operation is reliable; the APF host samples the current signal of the outlet end of the transformer, and further treats the three-phase unbalance and harmonic wave of the outlet end of the transformer;
the APF host receives three-phase current values of all compensation nodes through a communication bus, sequentially sequences the acquired values from small current to large current, namely, determines the sequence of the APF slave compensation nodes, sequentially performs subtraction operation of large current reduction current on each adjacent compensation node, and calculates the actual load current in each APF slave compensation node;
the APF host calculates the current unbalance of the APF output by calculating the load current in each APF compensation node and then deducting the unbalanced current compensated by the APF, and the APF host controls a phase change switch in the APF slave compensation node to enable the APF slave compensation node to achieve rough adjustment balance, and the remaining unbalanced current is issued by the host to instruct to control the APF output so as to enable the load current of each APF slave compensation node to be basically balanced;
after each compensation node APF executes a three-phase unbalanced fine adjustment instruction, the residual current starts a filtering function and locally compensates the load harmonic current;
when the current transformer of the APF slave compensation node of the N-1 is damaged, the system can calculate the real-time current of the N-1 node through the real-time values uploaded by the current transformers of the N node and the N-2 node, so that the system can be ensured to normally operate;
the active filter slave is connected to a compensation node of the distribution line, and a load is connected in parallel at the position of the compensation node;
and a current transformer is connected between the active filter master machine, the active filter slave machine and the distribution line.
2. The distributed three-phase imbalance and harmonic remediation device of claim 1 wherein the source filter master and active filter slaves internally mount wave blockers.
3. A distributed three-phase imbalance and harmonic remediation device according to claim 1 wherein the phase change switch is connected to a load.
4. The distributed three-phase imbalance and harmonic suppression device according to claim 1, wherein the active filter host is connected to the host computer via a communication bus.
5. A method for distributed three-phase imbalance and harmonic remediation, comprising the steps of:
each active filter slave machine samples the corresponding compensation node current and calculates a three-phase current value and a harmonic current;
the active filter host receives three-phase current values of each compensation node and analyzes the three-phase current unbalance degree of the three-phase current values;
the active filter host sends a commutation instruction to the commutation switch, and the commutation switch receives the commutation instruction and executes corresponding operation;
the active filter host sends a three-phase unbalanced fine adjustment instruction to the active filter slave, and the active filter slave executes corresponding operation after receiving the instruction;
after the active filter slave machine executes the instruction, the residual current opens the filtering function;
the active filter host samples a current signal of an outlet end of the transformer, and when the unbalance of the three-phase current exceeds a set threshold value, unbalance adjustment is carried out.
6. The method of claim 5, wherein the active filter host transmits the three-phase imbalance fine adjustment command and the phase inversion command with a set time interval therebetween.
7. The method of claim 6, wherein the set time interval is a time for the phase change switch to receive and execute instructions.
8. The method of claim 5, wherein the active filter slave and the phase change switch upload their own states to the active filter host via the communication bus, and the active filter host uploads their own device states and active filter slave and phase change switch states to the host.
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| JPH08223803A (en) * | 1995-02-16 | 1996-08-30 | Nissin Electric Co Ltd | Method and device for controlling active filter |
| CN202435399U (en) * | 2011-12-30 | 2012-09-12 | 南京思立科电子有限公司 | Miniature wave trap |
| CN102593838A (en) * | 2012-03-15 | 2012-07-18 | 南京亚派科技实业有限公司 | Intelligent distributed active filter system |
| WO2016146526A1 (en) * | 2015-03-13 | 2016-09-22 | Ulstein Power & Control As | Active harmonic system conditioner |
| CN104810831A (en) * | 2015-05-11 | 2015-07-29 | 武汉理工大学 | Distributed type control method of dynamic harmonic filter |
| CN105305470A (en) * | 2015-08-07 | 2016-02-03 | 北京中电博达科技有限公司 | Low-voltage load balance adjustment device for power distribution network, and automatic phase-change switch |
| CN106684874A (en) * | 2017-03-15 | 2017-05-17 | 河南理工大学 | Active power filter specific harmonic optimizing and compensating method |
| CN107086591A (en) * | 2017-04-25 | 2017-08-22 | 武汉大学 | A kind of three-phase imbalance adjuster based on reactive-load compensation and intelligent commutation |
| CN108767881A (en) * | 2018-07-05 | 2018-11-06 | 北京中电泰瑞科技有限公司 | The comprehensive treatment device and method of power distribution network three-phase load unbalance |
| CN110571822A (en) * | 2019-08-28 | 2019-12-13 | 深圳市慧能互联科技有限公司 | Intelligent compensation control method for active power filter |
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