Intelligent electric reactor

Abstract

The embodiment of the utility model discloses an intelligent electric reactor, the intelligent electric reactor comprises: a main power supply loop, a bypass switch, a control circuit, the control circuit comprises a waveform detection circuit, a data processing circuit and a drive circuit, the waveform detection circuit is connected with the output end of the waveform acquisition circuit and the input end of the data processing circuit, and the drive circuit is connected with the output end of the bypass switch. And the driving circuit is connected with the output end of the data processing circuit and the gate pole of the thyristor, so that the controllable reactor can be adjusted in real time along with the reactive power change of a power grid, and the reactive power adjustment precision is improved.

Description

Technical Field

[0001] The utility model relates to the technical field of reactors in power equipment, in particular to an intelligent reactor capable of accurately adjusting reactive power output. Background Art

[0002] As the capacity of the power grid increases, the electrical equipment in the power grid becomes more and more diversified. Due to the large-scale application of inductive loads such as squirrel cage motors, a large amount of reactive power is generated. In order to reduce the transmission of reactive power in the power grid, reactive power compensation is required at the power consumption end. However, existing reactive power compensation equipment, such as mechanical reactors, cannot accurately adjust reactive power. Power electronic switching equipment can control current, but for reactors, due to changes in grid load and external interference, existing power electronic switching equipment cannot achieve real-time control of reactors, and the control accuracy is lacking. Utility Model Content

[0003] In view of the above problems, the utility model proposes an intelligent reactor to solve the technical problems existing in the background technology.

[0004] The technical solution adopted by the utility model is:

[0005] A smart reactor, comprising:

[0006] A main power supply circuit, the main power supply circuit includes a waveform acquisition circuit and a controllable reactor connected in series in sequence, the main power supply circuit is connected to a power supply and a load, the controllable reactor includes a reactance coil and a thyristor connected in series, and the waveform acquisition circuit includes a voltage waveform acquisition circuit and a current waveform acquisition circuit;

[0007] A bypass switch, wherein the bypass switch is connected in parallel with two ends of the controllable reactor;

[0008] A control circuit, the control circuit comprising a waveform detection circuit, a data processing circuit and a drive circuit, the waveform detection circuit is connected to the output end of the waveform acquisition circuit and the input end of the data processing circuit, and the drive circuit is connected to the output end of the data processing circuit and the gate of the thyristor;

[0009] The waveform detection circuit includes a step-down circuit, a filter circuit, a phase compensation circuit and a trigger pulse circuit connected in series in sequence. The input end of the step-down circuit is connected to the output end of the waveform acquisition circuit, and the trigger pulse circuit is connected to the input end of the data processing circuit.

[0010] Furthermore,

[0011] The waveform detection circuit includes a voltage waveform detection circuit and a voltage waveform detection circuit.

[0012] Furthermore,

[0013] The step-down circuit comprises a primary transformer and a secondary transformer connected in series in sequence, the input end of the primary transformer is connected to the output end of the waveform acquisition circuit, and the secondary transformer is connected to the input end of the filter circuit;

[0014] For the voltage waveform detection circuit, the primary transformer is a voltage transformer, and the secondary transformer is a current transformer;

[0015] For the current waveform detection circuit, the primary transformer is a current transformer, and the secondary transformer is a current transformer.

[0016] Furthermore,

[0017] The phase compensation circuit is provided with an adjustable resistor for adjusting the phase shift.

[0018] Furthermore,

[0019] The waveform acquisition circuit includes a high-voltage current transformer and a high-voltage voltage transformer connected to the main power supply circuit, the high-voltage current transformer is connected to the current waveform detection circuit, and the high-voltage voltage transformer is connected to the voltage waveform detection circuit.

[0020] Furthermore,

[0021] The driving circuit includes a pulse transformer.

[0022] Furthermore,

[0023] The data processing circuit is connected to the driving circuit via an optical fiber.

[0024] Furthermore,

[0025] The filter circuit is an RC low-pass filter.

[0026] Furthermore,

[0027] A current limiting resistor is provided between the primary mutual inductor and the secondary mutual inductor, and an overcurrent protection circuit is provided between the phase compensation circuit and the trigger pulse circuit.

[0028] The intelligent reactor provided by the utility model drives the controllable reactor to adjust the trigger time according to the acquired grid parameters through a waveform detection circuit, a data processing circuit and a drive circuit, thereby realizing real-time adjustment of the controllable reactor as the reactive power of the grid changes, thereby improving the accuracy of reactive power regulation.

[0029] The above description is only an overview of the technical solution of the utility model. In order to more clearly understand the technical means of the utility model, it can be implemented in accordance with the contents of the specification. In order to make the above and other purposes, features and advantages of the utility model more obvious and easy to understand, the specific implementation methods of the utility model are listed below. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] By reading the detailed description of the preferred embodiment below, various other advantages and benefits will become clear to those of ordinary skill in the art. The accompanying drawings are only used for the purpose of illustrating the preferred embodiment and are not considered to be limiting of the present invention. Moreover, the same reference symbols are used throughout the accompanying drawings to represent the same components. In the accompanying drawings:

[0031] Figure 1 The electrical wiring diagram of the intelligent reactor of the utility model is shown;

[0032] Figure 2 A schematic diagram of a control circuit of an intelligent reactor of the utility model is shown;

[0033] Figure 3 The circuit diagram of the intelligent reactor driving circuit of the utility model is shown;

[0034] Figure 4 The circuit diagram of the waveform detection circuit of the intelligent reactor of the utility model is shown. DETAILED DESCRIPTION

[0035] The exemplary embodiments of the present disclosure will be described in more detail below with reference to the accompanying drawings. Although the exemplary embodiments of the present disclosure are shown in the accompanying drawings, it should be understood that the present disclosure can be implemented in various forms and should not be limited by the embodiments set forth herein. On the contrary, these embodiments are provided to enable a more thorough understanding of the present disclosure and to fully convey the scope of the present disclosure to those skilled in the art.

[0036] The specific implementation includes the following:

[0037] refer to Figure 1 and 2 , a smart reactor of this embodiment, the smart reactor comprises:

[0038] A main power supply circuit, the main power supply circuit includes a waveform acquisition circuit and a controllable reactor connected in series in sequence, the main power supply circuit connects a power supply and a load, the controllable reactor includes a reactor coil R and a thyristor VT connected in series, the waveform acquisition circuit includes a voltage waveform acquisition circuit and a current waveform acquisition circuit; a bypass switch K, the bypass switch K is connected in parallel with both ends of the controllable reactor; a control circuit, the control circuit includes a waveform detection circuit, a data processing circuit and a drive circuit, the waveform detection circuit is connected to the output end of the waveform acquisition circuit and the input end of the data processing circuit, the drive circuit is connected to the The output end of the data processing circuit is connected to the gate of the thyristor VT; in this embodiment, the data processing circuit can use DSP, or other control chips such as a single-chip microcomputer. The DSP can use an ADSP-BF506F chip, which is mainly used for real-time acquisition, processing and control of system data, and is connected to a host computer through a serial port. The host computer is used for remote control and communication of the intelligent inductor, and is connected to the drive circuit through an optical fiber. The control of the DSP chip makes the control of the intelligent inductor more reliable, flexible and stable, and can well meet the smooth regulation requirements of reactive power compensation in the power system.

[0039] The waveform detection circuit of this embodiment includes a step-down circuit 1, a filter circuit 2, a phase compensation circuit 3 and a trigger pulse circuit 4 which are connected in series in sequence. The input end of the step-down circuit 1 is connected to the output end of the waveform acquisition circuit, and the trigger pulse circuit 4 is connected to the input end of the data processing circuit.

[0040] The waveform detection circuit of the present embodiment can be divided into a voltage waveform detection circuit and a current waveform detection circuit. The step-down circuit 1 of the present embodiment includes a primary transformer and a secondary transformer connected in series in sequence. The voltage and current phase signals are converted into low voltage phase signals through the primary transformer and the secondary transformer respectively. The input end of the primary transformer is connected to the output end of the waveform acquisition circuit, and the secondary transformer is connected to the input end of the filter circuit. The specific circuit is as follows: Figure 4 As shown, it belongs to the current waveform detection circuit, the primary transformer is the current transformer CT1, and the secondary transformer is the current transformer CT2. For the voltage waveform detection circuit, the primary transformer is the voltage transformer, and the secondary transformer remains unchanged and is also a current transformer. A current limiting resistor is provided between the primary transformer and the secondary transformer, and an overcurrent protection circuit is provided between the phase compensation circuit and the trigger pulse circuit. In this embodiment, a current limiting resistor can prevent the current on the primary side of the transformer from being too large and burning the secondary transformer.

[0041] exist Figure 4In the embodiment, the phase compensation circuit 3 is provided with an adjustable resistor R5 for adjusting the phase shift, and the adjustable resistor can be a sliding rheostat. By adjusting the resistance value of R5, the phase shift caused by the environment or the parameter problem of the device itself can be adjusted. The filter circuit is an RC low-pass filter composed of a resistor R2 and a capacitor C1.

[0042] The waveform acquisition circuit includes a high-voltage current transformer CT and a high-voltage voltage transformer PT connected to the main power supply circuit, the high-voltage current transformer CT is connected to the current waveform detection circuit, and the high-voltage voltage transformer PT is connected to the voltage waveform detection circuit. The high-voltage current transformer CT and the high-voltage voltage transformer PT are respectively connected to the main power supply circuit, and the specific installation method is that the high-voltage current transformer CT is installed in parallel on the main power supply circuit, and the high-voltage voltage transformer PT is connected in series on the main power supply circuit.

[0043] like Figure 3 As shown, the driving circuit includes a pulse transformer, specifically a KCB-06A pulse transformer, which has the advantages of small leakage inductance and fast response speed, and can isolate the driving circuit from the main circuit, convert pulses with higher voltage and current into pulses with lower voltage and current, and then add them to the gate of the thyristor for control. The first-stage transistor of the driving circuit has an overheating protection function, and the data processing circuit is connected to the driving circuit through an optical fiber, which realizes the isolation of the control circuit from the main circuit and avoids the damage of the processor chip to the high voltage.

[0044] By adopting the technical solution of the above-mentioned embodiment, based on the acquired grid parameters, the controllable inductor is driven to adjust the trigger time through the waveform detection circuit, the data processing circuit and the drive circuit, so as to realize real-time adjustment of the controllable inductor as the reactive power of the grid changes, thereby improving the accuracy of reactive power regulation.

[0045] Those skilled in the art will understand that although some embodiments herein include certain features included in other embodiments but not other features, the combination of features of different embodiments is meant to be within the scope of the present invention and to form different embodiments.

[0046] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the utility model, rather than to limit it. Although the utility model has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent replacements for some of the technical features therein. However, these modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the various embodiments of the utility model.

Claims

1. A smart reactor, characterized in that: The smart reactor comprises: A main power supply circuit, the main power supply circuit includes a waveform acquisition circuit and a controllable reactor connected in series in sequence, the main power supply circuit is connected to a power supply and a load, the controllable reactor includes a reactance coil and a thyristor connected in series, and the waveform acquisition circuit includes a voltage waveform acquisition circuit and a current waveform acquisition circuit; A bypass switch, wherein the bypass switch is connected in parallel with two ends of the controllable reactor; A control circuit, the control circuit comprising a waveform detection circuit, a data processing circuit and a drive circuit, the waveform detection circuit is connected to the output end of the waveform acquisition circuit and the input end of the data processing circuit, and the drive circuit is connected to the output end of the data processing circuit and the gate of the thyristor; The waveform detection circuit includes a step-down circuit, a filter circuit, a phase compensation circuit and a trigger pulse circuit connected in series in sequence. The input end of the step-down circuit is connected to the output end of the waveform acquisition circuit, and the trigger pulse circuit is connected to the input end of the data processing circuit.

2. The intelligent reactor according to claim 1, characterized in that: The waveform detection circuit includes a voltage waveform detection circuit and a voltage waveform detection circuit.

3. The intelligent reactor according to claim 2, characterized in that: The step-down circuit comprises a primary transformer and a secondary transformer connected in series in sequence, the input end of the primary transformer is connected to the output end of the waveform acquisition circuit, and the secondary transformer is connected to the input end of the filter circuit; For the voltage waveform detection circuit, the primary transformer is a voltage transformer, and the secondary transformer is a current transformer; For the current waveform detection circuit, the primary transformer is a current transformer, and the secondary transformer is a current transformer.

4. The intelligent reactor according to claim 1, characterized in that: The phase compensation circuit is provided with an adjustable resistor for adjusting the phase shift.

5. The intelligent reactor according to claim 3, characterized in that: The waveform acquisition circuit includes a high-voltage current transformer and a high-voltage voltage transformer connected to the main power supply circuit, the high-voltage current transformer is connected to the current waveform detection circuit, and the high-voltage voltage transformer is connected to the voltage waveform detection circuit.

6. The intelligent reactor according to claim 1, characterized in that: The driving circuit includes a pulse transformer.

7. The intelligent reactor according to claim 6, characterized in that: The data processing circuit is connected to the driving circuit via an optical fiber.

8. The intelligent reactor according to claim 1, characterized in that: The filter circuit is an RC low-pass filter.

9. The intelligent reactor according to claim 3, characterized in that: A current limiting resistor is provided between the primary mutual inductor and the secondary mutual inductor, and an overcurrent protection circuit is provided between the phase compensation circuit and the trigger pulse circuit.

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