CN212085816U

CN212085816U - Modular active filtering device

Info

Publication number: CN212085816U
Application number: CN202020972509.3U
Authority: CN
Inventors: 赵增杰; 李军伟
Original assignee: Luoyang Chennuo Electric Co ltd
Current assignee: Chennuo Electric Technology Group Co.,Ltd.
Priority date: 2020-06-01
Filing date: 2020-06-01
Publication date: 2020-12-04
Anticipated expiration: 2030-06-01

Abstract

The utility model discloses an active filter equipment of modularization, including the filtering cabinet, be equipped with generating line room, circuit breaker, standardized power module and display screen on the filtering cabinet, the generating line room is located the interior top of filtering cabinet, the circuit breaker is located generating line room below, the filtering cabinet surface is equipped with the circuit breaker operating handle who connects the circuit breaker, the display screen is located circuit breaker operating handle top, standardized power module is located the circuit breaker below, standardized power module includes four power module of group's upper and lower sequence arrangement. Compared with the prior art, the utility model the advantage lie in: modularization and relative independence of all parts can be realized, and the cabinet can be conveniently arranged in various cabinets, so that the product quality can be greatly improved and the cabinet can be rapidly produced.

Description

Modular active filtering device

Technical Field

The utility model relates to an active filter technical field specifically indicates a modularization active filter device.

Background

In a practical power supply system, due to the presence of a non-linear load, a non-sinusoidal current is formed when a current flows through a load that is not linearly related to the applied voltage. Any periodic waveform can be decomposed into a fundamental sine wave plus a sine wave of many harmonic frequencies. The harmonic frequencies are integral multiples of the fundamental frequency, e.g., 50Hz for the fundamental, 100Hz for the second, and 150Hz for the third. Therefore, the distorted current waveform may have a second harmonic, a third harmonic, and the like.

The harmonic damage is very serious. The harmonics reduce the efficiency of production, transmission and utilization of electrical energy, cause overheating of electrical equipment, vibration and noise generation, and cause insulation aging, shortened service life, and even failure or burnout. The harmonic wave can cause the local parallel resonance or series resonance of the power system, so that the harmonic wave content is amplified, and the equipment such as a capacitor and the like is burnt. Harmonic waves can also cause relay protection and automatic device malfunction, which makes electric energy metering chaotic. Outside of the power system, harmonics can cause severe interference to communication equipment and electronic equipment.

The traditional LC filter can only passively absorb a certain specific harmonic wave and has amplification effect on other subharmonic waves, and meanwhile, the harmonic wave absorption characteristic is changed due to the change of the grid frequency and has no stability. In addition, the capacitance value of the capacitor can change along with time and environment, so that resonance with a system occurs, the capacitor is easy to damage, and power supply abnormality of a power grid is caused. The passive absorption method is used for removing east and west, has poor treatment effect, poor reliability and short service life, and is not suitable for users with low reactive power.

The active filter consists of two main parts, namely an instruction current arithmetic circuit and a compensation current generating circuit. The instruction current arithmetic circuit monitors the current in the line in real time, converts an analog current signal into a digital signal, sends the digital signal into a high-speed digital signal processor DSP to process the signal, separates harmonic waves from fundamental waves, sends out driving pulses to the compensating current generating circuit in the form of Pulse Width Modulation (PWM) signals, drives an IGBT power module, generates compensating current with the same amplitude and the opposite polarity as the harmonic current, injects the compensating current into a power grid, compensates or counteracts the harmonic current, and actively eliminates power harmonic waves, thereby realizing dynamic, rapid and thorough treatment of the power harmonic waves.

At present, the active filtering engineering applied to the power system has large demand difference, various different demands exist in the aspects of power grade, wiring form, compensation form and the like, the uniform specification is difficult to be realized, the customization is often needed according to specific engineering, the cost is high, when the capacity expansion or the modification is needed, the large change needs to be carried out on each part, and the expansion of the module is not facilitated

SUMMERY OF THE UTILITY MODEL

The technical problem to be solved by the utility model is to overcome the technical defects, provide a modularization, each part is relatively independent, and can be conveniently arranged in various cabinet bodies, thereby greatly improving the product quality and rapidly producing; meanwhile, according to design requirements, a complete set of modularized active filtering device with various specifications of cabinet bodies is formed.

In order to solve the technical problem, the utility model provides a technical scheme does: the utility model provides an active filter equipment of modularization, includes the filtering cabinet, be equipped with bus-bar room, circuit breaker, standardized power module and display screen on the filtering cabinet, the bus-bar room is located the interior top of filtering cabinet, the circuit breaker is located bus-bar room below, the filtering cabinet surface is equipped with the circuit breaker operating handle who connects the circuit breaker, the display screen is located circuit breaker operating handle top, standardized power module is located the circuit breaker below, standardized power module includes the power module of four group's upper and lower sequence arrangements.

The power module instruction current operation circuit monitors the current in a line in real time, converts an analog current signal into a digital signal, sends the digital signal into a high-speed Digital Signal Processor (DSP) to process the signal, separates harmonic waves from fundamental waves, sends a driving pulse to the compensation current generating circuit in a Pulse Width Modulation (PWM) signal form, drives an Insulated Gate Bipolar Transistor (IGBT) power module, and generates compensation current which is equal to the amplitude of the harmonic current and has opposite polarity and injects the compensation current into a power grid.

The power module combines power elements such as a current acquisition unit, operational amplification current, IGBT and the like, designs a modularized power module, and can be replaced among modules.

The power modules are electrically connected with each other through the lapping busbar, and the control connection adopts a network cable or 485 communication connection.

The display screen dynamically displays voltage, current, power factor, harmonic distortion rate and working state of the power module.

As an improvement, an EP mounting bracket is arranged at the bottom in the filter cabinet.

As an improvement, the surface of the filter cabinet is provided with a wiring support.

As an improvement, the surface of the filter cabinet is provided with heat dissipation holes corresponding to the standardized power module.

As an improvement, the bus chamber is connected with the circuit breaker through a copper bar.

As an improvement, the circuit breaker is connected with the standardized power modules through copper wires, and adjacent power modules are connected through copper wires.

As an improvement, the display screen is connected with the standardized power module through a standard 485 communication line.

Compared with the prior art, the utility model the advantage lie in: the modular design technology is applied to the design of the active filter device, so that the device has more flexible assembly mode and reliability. The problem of in the current integrated design subassembly can't standardize, can't realize different engineering application rapidly during the engineering customization is solved, the defect of integrated design scheme has been overcome. The three major functions are designed in an independent and modularized mode, functional connection among the assemblies is achieved through the standard interface, and the engineering requirements of overall quick installation and differentiated customization of the active filter device are met.

Drawings

Fig. 1 is a schematic view of a modular active power filter of the present invention.

Fig. 2 is a schematic side view of the modular active power filter device of the present invention.

As shown in the figure: 1. filter cabinet, 2, generating line room, 3, circuit breaker, 4, standardized power module, 5, display screen, 6, circuit breaker operating handle, 7, EP installing support, 8, walk line support, 9, louvre.

Detailed Description

The present invention will be described in further detail with reference to the accompanying drawings.

Combine shown in fig. 1-2, an active filter equipment of modularization, including filtering cabinet 1, be equipped with bus-bar room 2, circuit breaker 3, standardized power module 4 and display screen 5 on the filtering cabinet 1, bus-bar room 2 is located filtering cabinet 1 internal top, circuit breaker 3 is located bus-bar room 2 below, 1 surface of filtering cabinet is equipped with the circuit breaker operating handle 6 of connecting circuit breaker 3, display screen 5 is located circuit breaker operating handle 6 top, standardized power module 4 is located circuit breaker 3 below, standardized power module 4 includes four power module of group's upper and lower sequence arrangement.

The bottom is equipped with EP installing support 7 in the

filtering cabinet

1, 1 surface of filtering cabinet is equipped with

walks line support

8, 1 surface of filtering cabinet corresponds standardized power module 4 and is equipped with louvre 9, be connected through the copper bar between bus-bar room 2 and the circuit breaker 3, pass through copper line connection between circuit breaker 3 and the standardized power module 4, pass through copper line connection between the adjacent power module, connect through standard 485 communication lines between display screen 5 and the standardized power module 4.

When the utility model is implemented, the standardized bus-bar room 2 is designed to be convenient for combining and electrically connecting with other load cabinets, the circuit breaker 3 is designed to conveniently realize the disconnection of the whole electric loop of the active filter cabinet, short-circuit protection, designing a circuit breaker operating handle 6 for convenient and safe operation, designing a standardized power module 4, integrating current sampling, an operational amplifier circuit, a power panel, an IGBT, a laminated busbar and the like into an electric cabinet for convenient installation, designing the standardized power module 4, replacing a plurality of power modules, replacing the standardized power modules 4, connecting the power modules by copper bars or copper wires, connecting the power modules by network cables and a standard 485 communication line for communication, designing a display screen 5, and dynamically displaying the working condition of the power module, the system voltage, the current condition, the power factor condition and the like.

The present invention and the embodiments thereof have been described above, but the description is not limited thereto, and the embodiment shown in the drawings is only one of the embodiments of the present invention, and the actual structure is not limited thereto. In summary, those skilled in the art should understand that they should not be limited to the embodiments described above, and that they can design the similar structure and embodiments without departing from the spirit of the invention.

Claims

1. A modular active filter device comprising a filter cabinet (1), characterized in that: be equipped with bus-bar room (2), circuit breaker (3), standardized power module (4) and display screen (5) on filtering cabinet (1), bus-bar room (2) are located filtering cabinet (1) top, circuit breaker (3) are located bus-bar room (2) below, filtering cabinet (1) surface is equipped with circuit breaker operating handle (6) of connecting circuit breaker (3), display screen (5) are located circuit breaker operating handle (6) top, standardized power module (4) are located circuit breaker (3) below, standardized power module (4) are including four power module of group's upper and lower order arrangement.

2. A modular active filtering device according to claim 1, characterized in that: an EP mounting bracket (7) is arranged at the bottom in the filter cabinet (1).

3. A modular active filtering device according to claim 1, characterized in that: the surface of the filtering cabinet (1) is provided with a wiring support (8).

4. A modular active filtering device according to claim 1, characterized in that: the surface of the filter cabinet (1) is provided with heat dissipation holes (9) corresponding to the standardized power module (4).

5. A modular active filtering device according to claim 1, characterized in that: the bus chamber (2) is connected with the breaker (3) through a copper bar.

6. A modular active filtering device according to claim 1, characterized in that: the circuit breaker (3) is connected with the standardized power module (4) through a copper wire, and adjacent power modules are connected through copper wires.

7. A modular active filtering device according to claim 1, characterized in that: the display screen (5) is connected with the standardized power module (4) through a standard 485 communication line.