CN111668842A

CN111668842A - Active power filter based on power line carrier communication

Info

Publication number: CN111668842A
Application number: CN202010599009.4A
Authority: CN
Inventors: 张春翌; 夏中元; 王梦杰
Original assignee: Shanghai Zhaoshuo Technology Co ltd
Current assignee: Shanghai Zhaoshuo Technology Co ltd
Priority date: 2020-06-28
Filing date: 2020-06-28
Publication date: 2020-09-15

Abstract

The invention discloses an active power filter based on power carrier communication, which belongs to the technical field of active power filtering, and particularly relates to an active power filter based on power carrier communication, which comprises an APF module I, an APF module II, a current acquisition module, a human-computer interface module and a three-phase alternating current module, wherein the APF module I comprises an active power filter module APF, a carrier communication module I and an alternating current output module, the internal structure of the APF module II is the same as that of the APF module I, the current acquisition module comprises a carrier communication module II, a current detection module and an alternating current power supply module I, the human-computer interface module comprises an alternating current power supply module II and a carrier communication module III, the APF module I, the APF module II, the current acquisition module and the human-computer interface module are electrically connected with the three-phase alternating current module, the device has simple structure and improves the practicability of the product.

Description

Active power filter based on power line carrier communication

Technical Field

The invention relates to the technical field of active power filtering, in particular to an active power filter based on power carrier communication.

Background

In recent years, with the improvement of the requirement of users on the power quality of a power distribution network, Active Power Filter (APF) and Static Var Generator (SVG) active power quality control products are widely applied, and the products detect harmonic, reactive or unbalanced current contained in a power grid, and then generate instruction current to control a voltage source type inverter based on an IGBT to generate opposite current to be injected into the power grid, so that the purpose of controlling the power quality is achieved.

The APF product of present mainstream all needs to insert the mutual-inductor signal of electric wire netting current, electric wire netting current transformer adorns usually on female arranging of load electric wire netting access point, the mutual-inductor secondary side is connected to the external terminal that the APF corresponds through very long cable on, in order to guarantee the safe work of system, APF need carry out reliable connection with mutual-inductor secondary side terminal and APF when inserting the electric wire netting, whether walk and cause the mutual-inductor secondary side to open a way easily, this installation that can give APF brings inconveniently, and make the reliability reduce.

APF is when practical application, in order to realize large capacity output, generally have a plurality of APF modules parallelly connected simultaneous use, generally can establish ties all parallel module's mutual-inductor input signal under this condition, then insert electric wire netting current transformer secondary side signal, in case there is the mutual-inductor signal terminal of a module to become flexible and will cause the mutual-inductor to open a way, all modules will unable normal operating.

A plurality of parallel APF modules generally use the same display screen to perform start-stop control, parameter setting and data display, and the APF modules are connected with the display screen through a communication line, so that the APF modules used in parallel need a transformer terminal and a communication terminal with weak signals besides a strong power terminal (A, B, C, N) accessed to a power grid, the difficulty is brought to the structure of a product and the EMC design, and the wiring is complex.

In order to improve the problems, the invention provides an active power filter based on power carrier communication.

Disclosure of Invention

This section is for the purpose of summarizing some aspects of embodiments of the invention and to briefly introduce some preferred embodiments. In this section, as well as in the abstract and the title of the invention of this application, simplifications or omissions may be made to avoid obscuring the purpose of the section, the abstract and the title, and such simplifications or omissions are not intended to limit the scope of the invention.

The present invention has been made in view of the above and/or other problems occurring in the conventional active power filter based on power carrier communication.

Therefore, an object of the present invention is to provide an active power filter based on power carrier communication, which can solve the above-mentioned problem of complicated wiring.

To solve the above technical problem, according to an aspect of the present invention, the present invention provides the following technical solutions:

an active power filter based on power carrier communication, comprising: the APF module I comprises an active power filter module APF, a carrier communication module I and an alternating current output module, the internal structure of the APF module II is the same as that of the APF module I, the current collection module comprises a carrier communication module II, a current detection module and an alternating current power supply module I, the human-computer interface module comprises an alternating current power supply module II and a carrier communication module III, and the APF module I, the APF module II, the current collection module and the human-computer interface module are electrically connected with the three-phase alternating current power supply module.

As a preferable aspect of the active power filter based on power carrier communication according to the present invention, wherein: the current acquisition module acquires a load current/power grid current signal, the carrier communication module II is electrically connected with the current detection module and the alternating current power supply module I, the alternating current power supply module I is electrically connected with the three-phase alternating current module, and the current acquisition module is installed on a load side/power grid side line.

As a preferable aspect of the active power filter based on power carrier communication according to the present invention, wherein: the carrier communication module I is electrically connected with the active power filter module APF and the alternating current output module, and the alternating current output module is electrically connected with the three-phase alternating current module.

As a preferable aspect of the active power filter based on power carrier communication according to the present invention, wherein: and the APF module II performs conventional harmonic extraction and control according to the power grid current signal.

As a preferable aspect of the active power filter based on power carrier communication according to the present invention, wherein: the second alternating current power supply module is electrically connected with the third carrier communication module, and the second alternating current power supply module is electrically connected with the three-phase alternating current module.

Compared with the prior art: this active power filter based on power line carrier communication, active power filter based on low pressure broadband power line carrier communication, the wireless parallelly connected of many active power filter has been realized innovatively, need not extra communication line, the parallel module need not to insert the mutual-inductor signal, direct three-phase access electric wire netting with the active power filter module just can use, the convenience of system has been improved greatly, also do benefit to production and maintenance, this technique also can be applied to in active electric energy quality control products such as static var generator, this device simple structure, the practicality of product has been improved.

Drawings

In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the present invention will be described in detail with reference to the accompanying drawings and detailed embodiments, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings without inventive exercise. Wherein:

FIG. 1 is a block diagram of the system of the present invention;

FIG. 2 is a schematic diagram of an APF module according to the present invention;

FIG. 3 is a schematic diagram of a current collection module according to the present invention.

In the figure, a first APF module 100, an active power filter module APF110, a first carrier communication module 120, an alternating current output module 130, a second APF module 200, a current acquisition module 300, a second carrier communication module 310, a current detection module 320, a first alternating current power supply module 330, a human-computer interface module 400, a second alternating current power supply module 410, a third carrier communication module 420 and a three-phase alternating current power supply module 500 are arranged.

Detailed Description

In order to make the aforementioned objects, features and advantages of the present invention comprehensible, embodiments accompanied with figures are described in detail below.

In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present invention, but the present invention may be practiced in other ways than those specifically described herein, and it will be apparent to those of ordinary skill in the art that the present invention may be practiced without departing from the spirit and scope of the present invention, and therefore the present invention is not limited to the specific embodiments disclosed below.

Next, the present invention will be described in detail with reference to the drawings, wherein for convenience of illustration, the cross-sectional view of the device structure is not enlarged partially according to the general scale, and the drawings are only examples, which should not limit the scope of the present invention. In addition, the three-dimensional dimensions of length, width and depth should be included in the actual fabrication.

In order to make the objects, technical solutions and advantages of the present invention more apparent, embodiments of the present invention will be described in detail with reference to the accompanying drawings.

The invention provides an active power filter based on power carrier communication, which has the advantage of complex wiring, and please refer to fig. 1-3, and comprises an APF module i 100, an APF module ii 200, a current collection module 300, a human-computer interface module 400 and a three-phase alternating current module 500;

further, the first APF module 100 includes an active power filter module APF110, a first carrier communication module 120 and an ac output module 130, the internal structure of the second APF module 200 is the same as that of the first APF module 100, the current collection module 300 includes a second carrier communication module 310, a current detection module 320 and a first ac power supply module 330, the human-computer interface module 400 includes a second ac power supply module 410 and a third carrier communication module 420, and the first APF module 100, the second APF module 200, the current collection module 300 and the human-computer interface module 400 are electrically connected to the three-phase ac power supply module 500.

Further, the current collection module 300 collects a load current/grid current signal, the second carrier communication module 310 is electrically connected to the current detection module 320 and the first ac power supply module 330, the first ac power supply module 330 is electrically connected to the three-phase ac power module 500, and the current collection module 300 is installed on a load side/grid side line.

Further, the first carrier communication module 120 is electrically connected to the active power filter module APF110 and the ac output module 130, and the ac output module 130 is electrically connected to the three-phase ac module 500.

Further, the second APF module 200 performs conventional harmonic extraction and control according to the grid current signal.

Further, the second ac power supply module 410 is electrically connected to the third carrier communication module 420, and the second ac power supply module 410 is electrically connected to the three-phase ac power module 500.

In particular use:

the current acquisition module 300 acquires a load current or a power grid current signal, the current acquisition module 300 has a current transformer function, directly replaces a conventional current transformer installed on a load side or a power grid side, and is installed on a load side or a power grid side target line;

after the power grid current signal acquired by the current acquisition module 300 is subjected to signal modulation by the power carrier communication modulation module, the signal is superimposed to a three-phase alternating current module 500 circuit connected into the collector;

a power line carrier communication demodulation module in the APF module I100 demodulates the power grid current signal sent by the collector from a three-phase line accessed to the APF;

the APF module II 200 performs conventional harmonic extraction and control according to the demodulated power grid current signal to realize an active filtering function;

after receiving a command operation of an interface operation superimposed on a three-phase power grid, the human-computer interface module 400 superimposes the command signal on a three-phase power supply line which is accessed to the human-computer interface and used for supplying power to the human-computer interface after performing signal modulation on the command signal by a power carrier communication modulation module;

the APF module I100 receives a command from a human-computer interface, which is superimposed to a three-phase power grid, demodulates the command and then performs start-stop and other command operations;

the APF module II 200 carries out signal modulation on data to be displayed through the power carrier communication modulation module and then superimposes signals on a three-phase line accessed to the APF;

the human-machine interface module 400 demodulates the data from the APF module, which is superimposed on the three-phase grid, after receiving it, and then displays it in the interface.

While the invention has been described above with reference to an embodiment, various modifications may be made and equivalents may be substituted for elements thereof without departing from the scope of the invention. In particular, the various features of the disclosed embodiments of the invention may be used in any combination, provided that no structural conflict exists, and the combinations are not exhaustively described in this specification merely for the sake of brevity and resource conservation. Therefore, it is intended that the invention not be limited to the particular embodiments disclosed, but that the invention will include all embodiments falling within the scope of the appended claims.

Claims

1. Active power filter based on power line carrier communication, its characterized in that: comprises an APF module I (100), an APF module II (200), a current acquisition module (300), a human-computer interface module (400) and a three-phase alternating current module (500), the APF module I (100) comprises an active power filter module APF (110), a carrier communication module I (120) and an alternating current output module (130), the internal structure of the APF module II (200) is the same as that of the APF module I (100), the current acquisition module (300) comprises a second carrier communication module (310), a current detection module (320) and a first alternating current power supply module (330), the human-computer interface module (400) comprises an alternating current power supply module II (410) and a carrier communication module III (420), the APF module I (100), the APF module II (200), the current acquisition module (300) and the human-computer interface module (400) are electrically connected with the three-phase alternating current module (500).

2. The active power filter based on power carrier communication of claim 1, wherein the current collection module (300) collects a load current/grid current signal, the second carrier communication module (310) electrically connects the current detection module (320) and the first ac power supply module (330), the first ac power supply module (330) electrically connects the three-phase ac power module (500), and the current collection module (300) is installed on a load side/grid side target line.

3. The active power filter based on power carrier communication of claim 1, wherein the carrier communication module one (120) electrically connects the active power filter module APF (110) and the ac output module (130), and the ac output module (130) electrically connects the three-phase ac power module (500).

4. The active power filter based on power carrier communication of claim 1, wherein the APF module II (200) performs conventional harmonic extraction and control according to a power grid current signal.

5. The active power filter based on power carrier communication of claim 1, wherein the second ac power supply module (410) is electrically connected to the third carrier communication module (420), and the second ac power supply module (410) is electrically connected to the three-phase ac power module (500).