RU2811423C1 - Network interference filtering device with reactive power compensator - Google Patents

Abstract

FIELD: electrical engineering.

SUBSTANCE: new design solution for connection, in particular the combination of network noise suppression filters with a reactive power compensation element in the form of a capacitor bank. A device for filtering network interference with a reactive power compensator, additionally containing a reactive power compensation element between the filtering elements that consists of a power capacitor bank, which simultaneously performs the functions of storage and filtering.

EFFECT: expansion of the network interference suppression band towards low frequencies (80 kHz), suppression of common-mode and differential interference, increase of the power factor (cos ϕ), improvement of electromagnetic compatibility and quality of consumed electricity.

1 cl, 1 tbl, 1 dwg

Description

The present invention relates to electrical engineering and a new design solution for connection, in particular combining network noise suppression filters with a reactive power compensation element in the form of a block of power capacitors. The device is installed in the power supply circuit of alternating current electricity consumers, which filters network interference - reduces the level of interference, and also compensates for a component of reactive power.

All consumers of electrical energy, with the exception of non-induction heaters and incandescent lamps, during operation create electromagnetic interference, conductive - spreading through wires and power supply networks and electromagnetic - spreading in space. The main consumers that create electromagnetic interference include: electric motors, welding equipment, fluorescent and LED lamps, power supplies, pulse converters of computer equipment and many other devices; they are not only sources of electromagnetic interference in a wide frequency range, but also load the power supply network as active and reactive components of total power consumption.

Reactive power is the part of the total power expended on electromagnetic processes in a load that has capacitive and inductive components. It does not perform useful work, causes additional heating of the conductors and requires the use of an energy source of increased power.

Electronic devices increasingly surround us in everyday life, and issues of electromagnetic compatibility (EMC) are becoming more and more pressing. In this regard, the requirements for network interference filters used to protect devices from the penetration of high-frequency interference from the power supply network and to protect against the penetration of high-frequency interference from electricity consumers into the network are becoming more stringent.

There are separate devices for suppressing network interference - network noise suppression filters, Patent RU 208745 U1, cl. N03N 7/09, publ. 01/12/2022 Bulletin. No. 2.

A noise suppression filter for alternating current circuits in a modular design is known, Patent RU 203577 U1, cl. G06F 21/00, H01F 41/02 publ. 04/13/2021 Bulletin. No. 11.

A known electromagnetic interference suppression filter, Patent RU 201014 U1, class. H01F 1/15308, publ. November 23, 2020 Bulletin. No. 33.

There are also reactive power compensation devices, which are described in detail on the website of the Khomov Electro company https://khomovelectro.ru

A known bridgeless power factor corrector is Patent RU U1 189902, class. N02M 1/42, publ. 06/11/2019 Bulletin. No. 17

A (unparalleled) method and device is proposed where network voltage filtering and reactive power compensation occur in a single cycle.

Part of the method presents the order of connection of elements, which is carried out in various combinations, the filtering elements are connected in series, and the element of the capacitor block is connected between two similar filtering elements in parallel to the power supply circuits of the device. The conditions for the implementation of the actions of the device elements in the method occur in a simultaneous single cycle mode.

The objective of the technical solution is to: expand the network interference suppression band towards low frequencies (80 kHz), suppress common-mode and differential interference, increase the power factor (Cos ϕ), improve electromagnetic compatibility and the quality of consumed electricity.

The problem is solved due to the fact that the method and device for filtering network noise with a reactive power compensator is a combined assembly of noise-suppressing filtering elements, consisting of at least two identical noise-suppression elements located in a metal housing, consisting of noise-suppressing inductively coupled common-mode chokes, chokes are made on toroidal magnetic cores made of amorphous and nanocrystalline alloys in the form of thin strips, noise-suppressing pass-through capacitors, a reactive power compensation element is connected between the filtering elements, consisting of a block of capacitors, which simultaneously performs the functions of storage and filtering action.

The network noise filtering device can be used in versions with different rated load currents (10, 16, 25, 40, 63, 100, 200 A) and, accordingly, in three-phase and single-phase power supply networks of 380/220 V.

The technical result provided by the given set of features is the expansion of the network interference suppression band towards low frequencies (80 kHz), suppression of common-mode and differential interference, increasing the power factor (Cos ϕ), improving electromagnetic compatibility and the quality of consumed electricity.

Practical testing of the claimed method and device confirmed the expansion of the network interference suppression band towards low frequencies (80 kHz), suppression of common-mode and differential interference, increase in power factor (Cos ϕ), improvement of electromagnetic compatibility and quality of consumed electricity.

The presence of a cause-and-effect relationship between the set of essential features of the claimed object and the achieved technical result is shown in Table 1.

The essence of the invention is illustrated by the drawing, which shows:

In (Fig. 1) Network interference filtering device with reactive power compensator, where it is indicated:

1. Protective grounding bus (PE)

2. Metal body

3. Common mode noise suppression choke

4. Pass-through noise suppression capacitor

5. Power capacitor block

The method presents the order of connection of elements, which is carried out in various combinations, filtering elements consisting of feed-through capacitors (C1, C2, C3, C4), and (C5, C6, C7, C8) and two common-mode noise suppression chokes (3), consisting of the four inductively coupled windings (L1, L2, L3, L4) and (L5, L6, L7, L8) are connected in series, and the capacitor block element (5), which includes three power capacitors (C9, C10, C11), connected between each other in a triangle and three fuses (F1, F2, F3), for each phase (A, B, C), connected between two similar filtering elements parallel to the power supply circuits of the device. The conditions for the implementation of the actions of the device elements in the method occur in a simultaneous single cycle mode.

A network noise filtering device with a reactive power compensator representing a combined assembly of noise suppression filtering elements consisting of at least two identical noise suppression elements located in a metal housing (2), consisting of noise suppression inductively coupled common mode chokes (3), the chokes are made on toroidal magnetic cores made of amorphous and nanocrystalline alloys in the form of thin strips, noise-suppressing pass-through capacitors (C1...C8), a reactive power compensation element (5) is connected between the filtering elements, consisting of a block of power capacitors (C9, C10, C11), interconnected in a triangle and three fuses-breakers

(F1, F2, F3), for each phase (A, B, C), simultaneously performing the functions of accumulative and filtering action.

The power capacitor block (5) is specially designed for AC filters of a three-phase network, as well as for power factor correction of a three-phase network with a high level of harmonic distortion and has a low value of its own losses.

Three power capacitor elements (C9, C10, C11) are connected inside the housing in a triangle; built-in overpressure fuses-breakers (F1, F2, F3) ensure safe operation and controlled shutdown in case of capacitor overload.

The design of power capacitors uses “dry” technology using metallized polypropylene film with local controlled self-healing, and the special composition of the polymer dielectric allows for high electrical strength in the operating temperature range up to +70°C.

The device operates as follows: a three-phase power supply network is connected to the input of the device (Fig. 1) (phase A, phase B, phase C, neutral N, protective grounding PE), the consumer distribution network is connected accordingly (phase A, phase B, phase C, neutral N, protective grounding PE) to the load. The device body must be connected to a grounding device. Filtering of network interference is carried out by noise suppression elements: noise-suppressing pass-through capacitors (C1...C8), noise-suppressing inductively coupled common-mode chokes (3), capable of eliminating common-mode and differential network interference, and the device provides attenuation of network interference from penetration from the power supply network and from interference from penetration into the network electricity consumers. A reactive power compensation element (5) is connected between the filtering elements, which simultaneously provides correction of the power factor (Cos ϕ), and ensures the attenuation of network interference in the low frequency region due to the large capacitance of the capacitors.

The device is housed in a metal case (2) using pass-through capacitors (C1...C8), which together provides shielding from internal and external electromagnetic fields, while ensuring electromagnetic compatibility of technical equipment.

The technical feasibility of the invention follows from the description of the method and device for filtering network interference with a reactive power compensator with the practical achievement of the specified technical result.

Claims (1)

A network noise filtering device with a reactive power compensator, representing a combined assembly of noise suppression filtering elements consisting of at least two identical noise suppression elements located in a metal case, consisting of noise suppression inductively coupled common mode chokes, the chokes are made on toroidal magnetic cores made of amorphous and nanocrystalline alloys in the form of thin strips, noise-suppressing pass-through capacitors, characterized by the fact that a reactive power compensation element is connected between the filtering elements, consisting of a block of power capacitors, which simultaneously performs the functions of storage and filtering action.

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