Novel active power filtering module

Abstract

The utility model discloses a novel active power filtering module, comprising a current sampling circuit which is responsible for collecting current signals in a power grid in real time and converting the current signals into digital signals suitable for processing; the harmonic analysis circuit is used for carrying out spectrum analysis on the current signal obtained by the current sampling circuit and extracting each harmonic component; the control circuit is used for generating a corresponding control signal according to a result of the harmonic analysis circuit; the filter circuit generates compensation current which is equal to the harmonic current in amplitude and opposite to the harmonic current in phase according to an instruction of the control circuit and injects the compensation current into a power grid; according to the utility model, the harmonic current is accurately identified and compensated, the harmonic pollution is effectively eliminated, the electric energy quality is improved, a high-performance microprocessor or a digital signal processor is adopted, the real-time detection and rapid compensation of the harmonic current are realized, and the filter circuit adopts an advanced power electronic device and a topological structure. And stable work can be ensured in a severe power grid environment.

Description

Technical Field

[0001] The utility model relates to the technical field of electric power, and particularly relates to a novel active power filter module. Background Technique

[0002] With the rapid development of power electronics technology, the problem of harmonic pollution in the power system is becoming increasingly serious. Harmonics will not only damage power equipment and reduce its service life, but also affect the stability of the power system and the power quality. Therefore, the research and development of an efficient and reliable active power filter module is of great significance for eliminating harmonic pollution and improving power quality. Content of the Utility Model

[0003] The purpose of the utility model is to solve the deficiencies existing in the existing filtering technology and improve the filtering effect and stability.

[0004] The utility model realizes the above purpose through the following technical solutions: providing a novel active power filter module, including: a current sampling circuit, responsible for real-time collecting the current signal in the power grid and converting it into a digital signal suitable for processing; a harmonic analysis circuit, performing spectral analysis on the current signal obtained by the current sampling circuit to extract each harmonic component; a control circuit, generating corresponding control signals according to the result of the harmonic analysis circuit; and a filtering circuit, generating a compensation current with the same amplitude and opposite phase as the harmonic current according to the instruction of the control circuit and injecting it into the power grid.

[0005] Further, the current sampling circuit adopts a high-precision sensor and an analog-to-digital converter.

[0006] Further, the harmonic analysis circuit adopts a digital signal processing algorithm capable of accurately identifying and separating harmonic components with different frequencies and amplitudes.

[0007] Further, the control circuit adopts a microprocessor or a digital signal processor.

[0008] Further, the filtering circuit adopts power electronic devices and a topology structure.

[0009] Further, an APF filter is adopted in the filtering circuit, and the APF filter includes a harmonic and reactive power detection circuit, an inverter, a control circuit, and a power supply and energy storage element.

[0010] Compared with the existing technology, the beneficial effects of the utility model are as follows:

[0011] 1. High-efficiency filtering: By accurately identifying and compensating harmonic currents, harmonic pollution is effectively eliminated and power quality is improved.

[0012] 2. Fast response: By adopting a high-performance microprocessor or digital signal processor, it realizes real-time detection and rapid compensation of harmonic currents.

[0013] 3. Good stability: The filtering circuit adopts advanced power electronic devices and topological structures to ensure stable operation even in harsh power grid environments.

[0014] 4. Wide application range: This module can be applied to power systems with different voltage levels and capacities, featuring good versatility and scalability. Description of the Drawings

[0015] Figure 1 It is the structure diagram of the active power filter module in the present utility model;

[0016] Figure 2 It is the control schematic diagram of the APF filter in the present utility model;

[0017] Figure 3 It is the structure diagram of the APF filter in the present utility model. Specific Embodiments

[0018] Next, the technical solutions in the embodiments of the present utility model will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present utility model. Obviously, the described embodiments are only a part of the embodiments of the present utility model, rather than all of the embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without making creative efforts shall fall within the protection scope of the present utility model.

[0019] In the description of the present utility model, it should be understood that the orientation or positional relationships indicated by the terms "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc. are based on the orientation or positional relationships shown in the drawings, and are only for the convenience of describing the present utility model and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus should not be construed as a limitation of the present utility model.

[0020] Combined with Figures 1 to 3 A novel active power filter module as shown, including: a current sampling circuit, responsible for real-time collecting the current signal in the power grid and converting it into a digital signal suitable for processing; a harmonic analysis circuit, performing spectral analysis on the current signal obtained by the current sampling circuit to extract each harmonic component; a control circuit, generating corresponding control signals according to the results of the harmonic analysis circuit; a filtering circuit, generating a compensation current with an amplitude equal to and a phase opposite to that of the harmonic current according to the instructions of the control circuit and injecting it into the power grid;

[0021] Among them, the current sampling circuit is responsible for collecting the current signal in the power grid in real time and converting it into a digital signal suitable for processing. The current sampling circuit uses high-precision sensors and analog-to-digital converters to ensure the accuracy and real-time nature of the sampled data;

[0022] The harmonic analysis circuit performs spectral analysis on the current signal obtained by the current sampling circuit to extract each harmonic component. This circuit uses advanced digital signal processing algorithms and can accurately identify and separate harmonic components with different frequencies and amplitudes;

[0023] The control circuit generates corresponding control signals according to the results of the harmonic analysis circuit and realizes precise compensation for harmonic current by adjusting the working state of the filtering circuit; The control circuit uses a high-performance microprocessor or digital signal processor and has the capabilities of fast response and precise control;

[0024] The filtering circuit is the core part of this module. It generates a compensation current with the same amplitude and opposite phase to the harmonic current according to the instructions of the control circuit and injects it into the power grid to eliminate harmonic pollution; The filtering circuit uses advanced power electronic devices and topological structures to ensure the high efficiency and stability of the filtering effect.

[0025] The APF filter mainly consists of the following parts:

[0026] 1. Harmonic and reactive power detection circuit: This circuit is responsible for detecting harmonic and reactive power components in the power grid. It usually detects the load current in real time through a current transformer (CT) and uses digital signal processing (DSP) technology to extract the harmonic components in the current.

[0027] 2. Inverter: The inverter is the core part of the active power filter. It generates a compensation current with the same magnitude and opposite direction to the harmonic current according to the information provided by the detection circuit. This compensation current is injected into the power grid to cancel the harmonic current, thereby achieving the purpose of filtering.

[0028] 3. Control circuit: The control circuit is responsible for controlling the operation of the inverter. It calculates the magnitude and phase of the compensation current that needs to be generated according to the detected harmonic and reactive power information and generates corresponding control signals to control the inverter.

[0029] 4. Power supply and energy storage components: The APF filter usually includes a DC power supply and some energy storage components (such as capacitors or inductors) to provide the required electrical energy for the inverter.

[0030] Brief description of the working principle of the APF filter:

[0031] The harmonic and reactive power detection circuit detects the load current in the power grid and extracts the harmonic components therein; the control circuit calculates the magnitude and phase of the compensation current to be generated according to the detected harmonic information; the inverter generates the corresponding compensation current according to the instructions of the control circuit; the compensation current is injected into the power grid and cancels out the harmonic current, thereby achieving the purpose of filtering.

[0032] The actual APF filter may have a more complex structure and control algorithm to adapt to different application scenarios and filtering requirements:

[0033] It consists of two main parts: the command current operation circuit and the compensation current generation circuit. It detects the harmonic currents and reactive currents of each order in the power grid in real time through an external current transformer to obtain its command current. 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 a high-speed digital signal processor (DSP) for signal processing, separates the harmonics from the fundamental wave, and sends drive pulses to the compensation current generation circuit in the form of pulse width modulation (PWM) signals to drive the IGBT or IPM power module to generate a compensation current with the same amplitude and opposite polarity to the power grid harmonic current and inject it into the power grid to compensate or cancel the harmonic current and actively eliminate power harmonics.

[0034] For those skilled in the art, it is obvious that the present utility model is not limited to the details of the above exemplary embodiments, and can be implemented in other specific forms without departing from the spirit or basic characteristics of the present utility model. Therefore, from any point of view, the embodiments should be regarded as exemplary and non-limiting. The scope of the present utility model is defined by the appended claims rather than the above description. Therefore, all changes falling within the meaning and scope of the equivalent elements of the claims are intended to be included in the present utility model. Any reference signs in the claims should not be regarded as limiting the claims involved.

[0035] In addition, it should be understood that although this specification is described according to embodiments, not every embodiment only contains an independent technical solution. This narrative way of the specification is only for clarity. Those skilled in the art should regard the specification as a whole, and the technical solutions in each embodiment can also be appropriately combined to form other embodiments that can be understood by those skilled in the art.

Claims

1. A new type of active power filter module, characterized in that: include: The current sampling circuit is responsible for collecting the current signal in the power grid in real time and converting it into a digital signal suitable for processing; A harmonic analysis circuit performs spectrum analysis on the current signal obtained by the current sampling circuit to extract each harmonic component; A control circuit, which generates a corresponding control signal according to the result of the harmonic analysis circuit; The filter circuit generates a compensation current with the same amplitude and opposite phase as the harmonic current according to the instruction of the control circuit, and injects the compensation current into the power grid.

2. The novel active power filter module according to claim 1 is characterized in that: The current sampling circuit adopts a high-precision sensor and an analog-to-digital converter.

3. The novel active power filter module according to claim 2 is characterized in that: The harmonic analysis circuit adopts a digital signal processing algorithm that can accurately identify and separate harmonic components of different frequencies and amplitudes.

4. The novel active power filter module according to claim 3 is characterized in that: The control circuit adopts a microprocessor or a digital signal processor.

5. The novel active power filter module according to claim 4 is characterized in that: The filter circuit adopts power electronic devices and topological structure.

6. The novel active power filter module according to claim 5 is characterized in that: The filter circuit adopts an APF filter, which includes a harmonic and reactive power detection circuit, an inverter, a control circuit, and a power supply and energy storage element.

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