Active power filter based on power line carrier communication

Abstract

The invention belongs to the technical field of active power filtering and discloses an active power filter is based on power line carrier communication. The filter 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, 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 carriercommunication 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 filter is scientific and reasonable in structural design, the technology can also be applied to active power quality control products such as a static var generator, the device is simple in structure, and the practicability of the products is improved.

Description

technical field [0001] The invention relates to the technical field of active power filtering, in particular to an active power filter based on power carrier communication. Background technique [0002] In recent years, with the improvement of users' requirements for power quality of distribution network, active power filter (APF) and static var generator (SVG) active power quality control products have been widely used. The harmonics, reactive power or unbalanced current contained in the power grid, and then generate command current to control the IGBT-based voltage source inverter to generate the opposite current and inject it into the power grid, so as to achieve the purpose of controlling power quality. [0003] The current mainstream APF products all need to be connected to the transformer signal of the grid current. The grid current transformer is usually installed on the busbar of the load grid access point, and the secondary side of the transformer is connected to th...

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Problems solved by technology

[0003] The current mainstream APF products all need to be connected to the transformer signal of the grid current. The grid current transformer is usually installed on the busbar of the load grid access point, and the secondary side of the transformer is connected to the corresponding external connection of the APF through a long cable. On the terminals, in order to ensure the safe operation of the system, when the APF is connected to the power grid, it is necessary to reliably connect the secondary side terminals of the transformer to the APF. inconvenience, and reduces reliability

[0004] In the actual application of APF, in order to achieve large-capacity output, there are generally multiple APF modules connected in parallel and used at the same time. In this case, the transformer input signals of all parallel modules are generally connected in series, and then connected to the grid current transformer for secondary side signal, once the transformer signal terminal of one module is loose, it will cause the transformer to open circuit, and all modules will not work normally

[0005] Multiple APF modules connected in parallel generally use the same display screen for start-stop control, parameter setting and data display. In addition to the terminals (A, B, C, N), transformer terminals and communication terminals with weak signal are also required, which brings difficulties to the product structure and EMC design, and the wiring is also complicated

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