CN218997689U

CN218997689U - Harmonic elimination control circuit

Info

Publication number: CN218997689U
Application number: CN202223269678.9U
Authority: CN
Inventors: 冯少凡
Original assignee: Baoding Smart Core Electrical Technology Co ltd
Current assignee: Baoding Smart Core Electrical Technology Co ltd
Priority date: 2022-12-07
Filing date: 2022-12-07
Publication date: 2023-05-09
Anticipated expiration: 2032-12-07

Abstract

The utility model relates to the technical field of electric power, in particular to a harmonic elimination control circuit which comprises a sampling comparison module and a harmonic elimination module, wherein the sampling comparison module comprises a sampling module, an MCU module and a voltage module, the sampling module is electrically connected with the MCU control module, the voltage module is electrically connected with the MCU module, and the harmonic elimination module is electrically connected with the MCU module. According to the resonance elimination control circuit provided by the utility model, the circuit is sampled at the moment, compared with the reference voltage provided by the voltage module, the MCU module controls the output voltage according to the fault, and the silicon controlled element is controlled to be conducted so as to enable the voltage to be grounded to eliminate the ferromagnetic resonance; the controllable silicon element is controlled to protect the circuit, so that the structure is simple, and stronger protection performance is formed for the circuit; and the current state of the circuit can be accurately judged through the state of the LED lamp.

Description

Harmonic elimination control circuit

Technical Field

The utility model relates to the technical field of electric power, in particular to a harmonic elimination control circuit.

Background

The electric power system has complex architecture, flexible operation mode and randomness of operation parameters, and the system parameters are promoted to be changed. Under the operation of the system or fault stimulation, inductance and capacitance elements in the system form various oscillation loops, and particularly under the action of certain specific excitation, electric equipment with iron cores and windings such as transformers, mutual inductors and the like can easily generate series-parallel resonance phenomenon due to electromagnetic coupling, so that serious ferromagnetic resonance overvoltage is caused. This ferromagnetic resonance can cause significant damage to the power supply system and even serious accidents. To avoid accidents, ferromagnetic resonances must be eliminated in time, two solutions are generally adopted: the method is characterized in that a harmonic elimination resistor is grounded at the primary side neutral point of the voltage transformer, but the device is large in size, inconvenient to install and not intelligent to operate, and the neutral point voltage is often increased, so that protection equipment is in misoperation; the other is that a secondary resonance elimination device is connected in parallel at the secondary side, namely, a secondary opening winding of the voltage transformer is short-circuited in a short time, and resonance intensity is gradually attenuated by consuming resonance energy, so that resonance elimination is realized. At present, the second method is mostly adopted for eliminating resonance, but the existing secondary resonance eliminating device is complex in structure, high in maintenance and use cost and incapable of accurately judging the current state of the circuit.

Disclosure of Invention

The present utility model aims to solve the above-mentioned drawbacks of the prior art by providing a resonance elimination control circuit.

The technical scheme adopted by the utility model is as follows:

the utility model provides a harmonic elimination control circuit, including sampling comparison module and harmonic elimination module, sampling comparison module includes sampling module, MCU module and voltage module, the MCU control module is connected to the sampling module electricity, the MCU module is connected to the voltage module electricity, the MCU module is connected to the harmonic elimination module electricity.

As a preferred technical scheme of the utility model: the sampling module comprises a first capacitor and a second capacitor, wherein the first end of the first capacitor and the first end of the second capacitor are respectively connected with the input end, and the second end of the first capacitor and the second end of the second capacitor are commonly grounded.

As a preferred technical scheme of the utility model: the sampling module further comprises a voltage converter, and the voltage converter is connected to two ends of the input end.

As a preferred technical scheme of the utility model: the sampling module further comprises a first resistor, a second resistor, a third capacitor and a fourth capacitor, wherein the first resistor and the third capacitor are respectively connected with the output end of the voltage converter, and the second resistor and the fourth capacitor are respectively connected with the output end of the voltage converter.

As a preferred technical scheme of the utility model: the first resistor, the third capacitor, the second resistor and the fourth capacitor respectively form a filter.

As a preferred technical scheme of the utility model: the voltage module comprises four resistors, an operational amplifier, a capacitor and a diode, wherein the first end of the third resistor is connected with a power supply, the other end of the fourth resistor is connected with the second end of the operational amplifier and the cathode of the diode, the anode of the diode is grounded, the third end of the operational amplifier is connected with the fourth resistor, the fifth capacitor, the fifth resistor and the sixth resistor, the fourth end of the operational amplifier is grounded, the fourth resistor is connected with the fifth end of the operational amplifier, the other ends of the fifth capacitor and the fifth resistor are connected with the sixth end of the operational amplifier, and the other ends of the sixth resistor are grounded.

As a preferred technical scheme of the utility model: the resonance elimination module comprises a seventh resistor, an eighth resistor, an LED lamp and a silicon controlled rectifier element, wherein the seventh resistor is connected with the MCU module, the other end of the seventh resistor is connected with the gate electrode of the silicon controlled rectifier element, the anode of the silicon controlled rectifier element is connected with the sampling input end, the cathode of the silicon controlled rectifier element is connected with the anode of the LED lamp, and the cathode of the LED lamp is grounded after being connected with the eighth resistor.

Compared with the prior art, the resonance elimination control circuit provided by the utility model has the beneficial effects that:

according to the resonance elimination control circuit provided by the utility model, the circuit is sampled at the moment, compared with the reference voltage provided by the voltage module, the MCU module controls the output voltage according to the fault, and the silicon controlled element is controlled to be conducted so as to enable the voltage to be grounded to eliminate the ferromagnetic resonance; the controllable silicon element is controlled to protect the circuit, so that the structure is simple, and stronger protection performance is formed for the circuit; and the current state of the circuit can be accurately judged through the state of the LED lamp.

Drawings

Fig. 1 is a schematic diagram of a harmonic elimination control circuit according to a preferred embodiment of the utility model.

Detailed Description

It should be noted that, under the condition of no conflict, the embodiments of the present embodiments and features in the embodiments may be combined with each other, and the technical solutions in the embodiments of the present utility model will be clearly and completely described below with reference to the drawings in the embodiments of the present utility model, and obviously, the described embodiments are only some embodiments of the present utility model, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the utility model without making any inventive effort, are intended to be within the scope of the utility model.

Referring to fig. 1, a preferred embodiment of the present utility model provides a resonance elimination control circuit, which includes a sampling comparison module and a resonance elimination module, wherein the sampling comparison module includes a sampling module, an MCU module and a voltage module, the sampling module is electrically connected with the MCU control module, the voltage module is electrically connected with the MCU module, and the resonance elimination module is electrically connected with the MCU module.

The sampling module comprises a first capacitor and a second capacitor, wherein the first end of the first capacitor and the first end of the second capacitor are respectively connected with the input end, and the second end of the first capacitor and the second end of the second capacitor are commonly grounded.

The sampling module further comprises a voltage converter, and the voltage converter is connected to two ends of the input end.

The sampling module further comprises a first resistor, a second resistor, a third capacitor and a fourth capacitor, wherein the first resistor and the third capacitor are respectively connected with the output end of the voltage converter, and the second resistor and the fourth capacitor are respectively connected with the output end of the voltage converter.

The first resistor, the third capacitor, the second resistor and the fourth capacitor respectively form a filter.

The voltage module comprises four resistors, an operational amplifier, a capacitor and a diode, wherein the first end of the third resistor is connected with a power supply, the other end of the fourth resistor is connected with the second end of the operational amplifier and the cathode of the diode, the anode of the diode is grounded, the third end of the operational amplifier is connected with the fourth resistor, the fifth capacitor, the fifth resistor and the sixth resistor, the fourth end of the operational amplifier is grounded, the fourth resistor is connected with the fifth end of the operational amplifier, the other ends of the fifth capacitor and the fifth resistor are connected with the sixth end of the operational amplifier, and the other ends of the sixth resistor are grounded.

The resonance elimination module comprises a seventh resistor, an eighth resistor, an LED lamp and a silicon controlled rectifier element, wherein the seventh resistor is connected with the MCU module, the other end of the seventh resistor is connected with the gate electrode of the silicon controlled rectifier element, the anode of the silicon controlled rectifier element is connected with the sampling input end, the cathode of the silicon controlled rectifier element is connected with the anode of the LED lamp, and the cathode of the LED lamp is grounded after being connected with the eighth resistor.

In this embodiment, in the sampling module, U0 and Un monitor and sample circuit voltages in real time, and the first capacitor C1 and the second capacitor C2 are respectively connected to the input ends U0 and Un, and are used for absorbing common-mode high-frequency interference signals in the sampled voltages. The second resistor R1 and the third capacitor C3 are respectively connected with the output end of the voltage converter, and the third resistor R2 and the fourth capacitor C4 are respectively connected with the two ends of the third capacitor. The first resistor R1 and the third capacitor C3, and the second resistor R2 and the fourth capacitor C4 respectively form a filter.

In the voltage module, a first end of a fourth resistor R4 and an operational amplifier T1 are connected with a power supply, the other end of the fourth resistor R4 is connected with a second end of the operational amplifier and a cathode of a diode D1, the cathode of the diode D2 is grounded, a third end of the operational amplifier is connected with a fifth resistor R5, a fifth capacitor C5, a sixth resistor R6 and a seventh resistor R7, the fourth end of the operational amplifier is grounded, the fifth resistor R5 is connected with a fifth end of the operational amplifier, the other ends of the fifth capacitor C5 and the sixth resistor R6 are connected with a sixth end of the operational amplifier, and the other end of the seventh resistor R7 is grounded. The voltage module provides a reference voltage of 30V to the MCU through the operational amplifier according to the regulated R3 value and through the filtering control of R4, R5, C5 and R6.

In the harmonic elimination module, an eighth resistor R8 is connected with the MCU module, the other end of the eighth resistor R8 is connected with the gate electrode of the silicon controlled rectifier element D2, the anode of the silicon controlled rectifier element D2 is connected with the sampling input end, the cathode of the silicon controlled rectifier element D2 is connected with the anode of the LED lamp D3, and the cathode of the LED lamp D3 is grounded after being connected with a ninth resistor R9. When the MCU judges that the voltage sampled by the sampling module is greater than the reference voltage by 30V according to the reference voltage of 30V provided by the voltage module, the judging circuit breaks down, and when the fault is judged to be ferromagnetic resonance, a control voltage is output, so that the voltage is conducted through the controllable silicon element to enable the voltage to flow through the ninth resistor R9 to be grounded so as to eliminate the ferromagnetic resonance.

It will be evident to those skilled in the art that the utility model is not limited to the details of the foregoing illustrative embodiments, and that the present utility model may be embodied in other specific forms without departing from the spirit or essential characteristics thereof. The present embodiments are, therefore, to be considered in all respects as illustrative and not restrictive, the scope of the utility model being indicated by the appended claims rather than by the foregoing description, and all changes which come within the meaning and range of equivalency of the claims are therefore intended to be embraced therein. Any reference sign in a claim should not be construed as limiting the claim concerned.

Furthermore, it should be understood that although the present disclosure describes embodiments, not every embodiment is provided with a separate embodiment, and that this description is provided for clarity only, and that the disclosure is not limited to the embodiments described in detail below, and that the embodiments described in the examples may be combined as appropriate to form other embodiments that will be apparent to those skilled in the art.

Claims

1. The utility model provides a harmonic elimination control circuit, includes sampling comparison module and harmonic elimination module, its characterized in that: the sampling comparison module comprises a sampling module, an MCU module and a voltage module, wherein the sampling module is electrically connected with the MCU control module, the voltage module is electrically connected with the MCU module, and the resonance elimination module is electrically connected with the MCU module.

2. The resonance elimination control circuit according to claim 1, wherein: the sampling module comprises a first capacitor and a second capacitor, wherein the first end of the first capacitor and the first end of the second capacitor are respectively connected with the input end, and the second end of the first capacitor and the second end of the second capacitor are commonly grounded.

3. The resonance elimination control circuit according to claim 2, wherein: the sampling module further comprises a voltage converter, and the voltage converter is connected to two ends of the input end.

4. The resonance elimination control circuit according to claim 1, wherein: the sampling module further comprises a first resistor, a second resistor, a third capacitor and a fourth capacitor, wherein the first resistor and the third capacitor are respectively connected with the output end of the voltage converter, and the second resistor and the fourth capacitor are respectively connected with the output end of the voltage converter.

5. The detuning control circuit of claim 4, wherein: the first resistor, the third capacitor, the second resistor and the fourth capacitor respectively form a filter.

6. The resonance elimination control circuit according to claim 1, wherein: the voltage module comprises four resistors, an operational amplifier, a capacitor and a diode, wherein the first end of the third resistor is connected with a power supply, the other end of the fourth resistor is connected with the second end of the operational amplifier and the cathode of the diode, the anode of the diode is grounded, the third end of the operational amplifier is connected with the fourth resistor, the fifth capacitor, the fifth resistor and the sixth resistor, the fourth end of the operational amplifier is grounded, the fourth resistor is connected with the fifth end of the operational amplifier, the other ends of the fifth capacitor and the fifth resistor are connected with the sixth end of the operational amplifier, and the other ends of the sixth resistor are grounded.

7. The resonance elimination control circuit according to claim 1, wherein: the resonance elimination module comprises a seventh resistor, an eighth resistor, an LED lamp and a silicon controlled rectifier element, wherein the seventh resistor is connected with the MCU module, the other end of the seventh resistor is connected with the gate electrode of the silicon controlled rectifier element, the anode of the silicon controlled rectifier element is connected with the sampling input end, the cathode of the silicon controlled rectifier element is connected with the anode of the LED lamp, and the cathode of the LED lamp is grounded after being connected with the eighth resistor.