CN212085816U - A modular active filter device - Google Patents

Abstract

The utility model discloses a modular active filter device, comprising a filter cabinet, a busbar room, a circuit breaker, a standardized power module and a display screen are arranged on the filter cabinet, the busbar room is located at the top of the filter cabinet, and the The circuit breaker is located below the busbar compartment, the surface of the filter cabinet is provided with a circuit breaker operating handle connected to the circuit breaker, the display screen is located above the circuit breaker operating handle, the standardized power module is located below the circuit breaker, and the standardized power module is located below the circuit breaker. The group includes four groups of power modules arranged in sequence up and down. Compared with the prior art, the utility model has the advantages of modularization and relatively independent parts, which can be conveniently installed in various cabinets, thereby greatly improving product quality and rapid production.

Description

A modular active filter device

technical field

The utility model relates to the technical field of active filtering, in particular to a modular active filtering device.

Background technique

In the actual power supply system, due to the existence of non-linear loads, when the current flows through the load that is not linear with the applied voltage, a non-sinusoidal current is formed. Any periodic waveform can be decomposed into a fundamental frequency sine wave plus many harmonic frequency sine waves. The harmonic frequency is an integer multiple of the fundamental frequency. For example, the fundamental frequency is 50Hz, the second harmonic is 100Hz, and the third harmonic is 150Hz. Therefore, the distorted current waveform may have second harmonic, third harmonic and so on.

The harm of harmonics is very serious. Harmonics reduce the efficiency of the production, transmission and utilization of electrical energy, overheat electrical equipment, generate vibration and noise, and cause insulation aging, shortened service life, and even failure or burnout. Harmonics can cause local parallel resonance or series resonance in the power system, amplify the harmonic content, and cause capacitors and other equipment to burn. Harmonics can also cause malfunction of relay protection and automatic devices, causing confusion in electric energy measurement. For the outside of the power system, harmonics can cause serious interference to communication equipment and electronic equipment.

The traditional LC filter can only passively absorb a certain harmonic, and even has an amplifying effect on other harmonics. At the same time, the harmonic absorption characteristics are changed by the change of the power grid frequency and are not stable. In addition, the capacitance value of the capacitor will change with time and environment, resulting in resonance with the system, the capacitor is easily damaged, and the power supply of the power grid is abnormal. This passive absorption method has poor governance effect, poor reliability and short life, and is not suitable for users with low reactive power.

The active filter is composed of two main parts, the command current operation circuit and the compensation current generation circuit. The command current operation circuit monitors the current in the line in real time, converts the analog current signal into a digital signal, and sends it to the high-speed digital signal processor DSP to process the signal, separate the harmonic from the fundamental wave, and use the pulse width modulation PWM signal form Send drive pulses to the compensation current generating circuit, drive the IGBT power module, generate a compensation current with the same amplitude and opposite polarity as the harmonic current and inject it into the power grid, compensate or cancel the harmonic current, and actively eliminate the power harmonics, so as to realize the Dynamic, fast and thorough management of power harmonics.

At present, the requirements of active filter engineering for power system applications are quite different. There are many different requirements in terms of power level, wiring form and compensation form. It is difficult to have uniform specifications. It is often necessary to customize according to specific projects, and the cost is relatively high. High, when expansion or modification is required, each component needs to be changed greatly, which is not conducive to the expansion of the module

Utility model content

The technical problem to be solved by the utility model is to overcome the above technical defects, and to provide a modular, relatively independent part, which can be easily installed in various cabinets, thereby greatly improving product quality and rapid production; According to the design requirements, it is a modular active filter device that constitutes a complete set of cabinets of various specifications.

In order to solve the above technical problems, the technical solution provided by the present utility model is: a modular active filter device, comprising a filter cabinet, the filter cabinet is provided with a bus bar room, a circuit breaker, a standardized power module and a display screen, the filter cabinet is The busbar compartment is located at the top of the filter cabinet, the circuit breaker is located below the busbar compartment, the surface of the filter cabinet is provided with a circuit breaker operating handle connected to the circuit breaker, the display screen is located above the circuit breaker operating handle, and the standardized power module Located below the circuit breaker, the standardized power modules include four groups of power modules arranged in an up and down sequence.

The power module command current operation circuit monitors the current in the line in real time, converts the analog current signal into a digital signal, and sends it to the high-speed digital signal processor DSP to process the signal, separate the harmonics from the fundamental wave, and use pulses to separate the harmonics from the fundamental wave. The wide modulation PWM signal form sends the drive pulse to the compensation current generating circuit, drives the IGBT power module, and generates the compensation current with the same amplitude and opposite polarity as the harmonic current and injects it into the power grid.

The power module combines the current acquisition unit, operational amplifier current, IGBT and other power components, and designs a modular power module, which can be replaced between modules.

The main electrical connection between the power modules is connected by overlapping busbars, and the control connection is connected by a network cable or 485 communication.

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

As an improvement, the inner bottom of the filter cabinet is provided with an EP mounting bracket.

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

As an improvement, the surface of the filter cabinet is provided with cooling holes corresponding to the standardized power modules.

As an improvement, the busbar compartment and the circuit breaker are connected through copper bars.

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

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

Compared with the prior art, the advantage of the utility model is that the component design technology is applied to the design of the active filter device, so that the device has a more flexible assembly method and reliability. It solves the problems that components cannot be standardized in the existing integrated design, and different engineering applications cannot be quickly realized during engineering customization, and overcomes the defects of the integrated design scheme. The three major functions are designed independently and modularly, and the functional connection between components is realized through standard interfaces, so as to meet the engineering needs of rapid installation and differentiated customization of the active filter device as a whole.

Description of drawings

FIG. 1 is a schematic structural diagram of the front view of a modular active filter device of the present invention.

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

As shown in the picture: 1. Filter cabinet, 2. Bus room, 3. Circuit breaker, 4. Standardized power module, 5. Display screen, 6. Operation handle of circuit breaker, 7. EP mounting bracket, 8. Wiring bracket , 9, cooling holes.

Detailed ways

The present utility model will be further described in detail below in conjunction with the accompanying drawings.

1-2, a modular active filter device includes a filter cabinet 1, and the filter cabinet 1 is provided with a busbar compartment 2, a circuit breaker 3, a standardized power module 4 and a display screen 5. The The busbar compartment 2 is located at the top of the filter cabinet 1, the circuit breaker 3 is located below the busbar compartment 2, the surface of the filter cabinet 1 is provided with a circuit breaker operating handle 6 connected to the circuit breaker 3, and the display screen 5 is located at the circuit breaker operating handle. 6 above, the standardized power module 4 is located below the circuit breaker 3, and the standardized power module 4 includes four groups of power modules arranged in an up and down sequence.

The inner bottom of the filter cabinet 1 is provided with an EP mounting bracket 7 , the surface of the filter cabinet 1 is provided with a wiring bracket 8 , the surface of the filter cabinet 1 is provided with a heat dissipation hole 9 corresponding to the standardized power module 4 , and the busbar compartment 2 It is connected with the circuit breaker 3 through copper bars, the circuit breaker 3 and the standardized power module 4 are connected through copper wires, and the adjacent power modules are connected through copper wires, and the display screen 5 is connected with the standardized power module 4. Group 4 is connected by standard 485 communication line.

During the specific implementation of the utility model, a standardized bus bar room 2 is designed to facilitate parallel and electrical connection with other load cabinets, and a circuit breaker 3 is designed to facilitate the breaking and short-circuit protection of the overall electrical circuit of the active filter cabinet, and the circuit breaker is designed. Operation handle 6, convenient and safe operation, design standardized power module 4, integrate current sampling, operational amplifier circuit, power board, IGBT, laminated busbar, etc. into one electrical chassis, easy to install, design standardized power module 4, Several power modules can be replaced, and standardized power modules 4 can be replaced. The electrical connection between power modules is connected by copper bars or copper wires, and the communication between power modules is connected by network cable and standard 485 communication. Line connection, design display screen 5, and dynamically display the working status of the power module, system voltage, current status, power factor status, etc.

The present invention and the embodiments thereof have been described above, and the description is not restrictive, and what is shown in the accompanying drawings is only one of the embodiments of the present invention, and the actual structure is not limited thereto. All in all, if those of ordinary skill in the art are inspired by it, without departing from the purpose of the present invention, and without creatively designing the structural modes and embodiments similar to the technical scheme, all should belong to the protection of the present invention. scope.

Claims (7)

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.

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