CN219268755U - High-voltage variable-frequency speed regulation and soft start control circuit - Google Patents
High-voltage variable-frequency speed regulation and soft start control circuit Download PDFInfo
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- CN219268755U CN219268755U CN202320446941.2U CN202320446941U CN219268755U CN 219268755 U CN219268755 U CN 219268755U CN 202320446941 U CN202320446941 U CN 202320446941U CN 219268755 U CN219268755 U CN 219268755U
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Abstract
The utility model discloses a high-voltage variable-frequency speed regulation and soft start control circuit, and belongs to the technical field of high-voltage frequency converters. The high-voltage frequency converter, the high-voltage switch in the incoming cabinet, the high-voltage switch in the power frequency cabinet, the high-voltage switch in the outgoing cabinet and the high-voltage switch in the bypass cabinet are sequentially connected in series; the reactor is connected with a high-voltage switch in the bypass cabinet in parallel, and the high-voltage switch in the bypass cabinet is used for bypass cutting the reactor. According to the utility model, the hardware such as the reactor and the automatic bypass switch of the reactor are added in the conventional control circuit of the high-voltage frequency converter, and the control algorithm logic is adjusted to complete automatic cutting or input of the reactor in the circuit according to related instructions, so that the high-voltage frequency converter is used as a speed regulating device or a soft starting device for switching, and the process of bidirectional non-disturbance synchronous switching from frequency conversion to power frequency and from power frequency to frequency conversion can be realized.
Description
Technical Field
The utility model relates to a high-voltage variable-frequency speed regulation and soft start control circuit, and belongs to the technical field of high-voltage frequency converters.
Background
With the rapid development of power electronic technology, computers and automatic control technology, the alternating current high-voltage frequency converter has basically replaced traditional step-down/pole-changing/slip speed regulation, internal feedback cascade speed regulation, hydraulic coupler speed regulation and the like to become a main means of alternating current motor speed regulation, and the high-voltage frequency converter obtains the acceptance of wide users in various industries and the confirmation of markets with obvious energy saving benefits, high speed regulation precision, wide speed regulation range, perfect power electronic protection function and other technical performances, and can be a preferred scheme for improving the process automation degree, improving the production efficiency, saving energy, reducing consumption and reducing the operation cost of users for motor systems of enterprises at home and abroad.
The high-voltage frequency converter based on vector control has excellent performance and application, the large-horse-drawn trolley is not used for configuring the power of the motor, the motor can be configured according to the maximum value in the process requirement, and the high-voltage frequency converter with proper capacity can be configured according to parameters such as the power of the motor. However, the frequency converter operates in a speed regulation mode in a full load stage, and the high-voltage frequency converter has own loss, so that electric energy is wasted. Although an automatic power frequency bypass system is configured in general, a frequency converter is used for controlling the breaking output switch, and then a power frequency switch is directly combined with a power frequency switch to directly drive a motor to operate by a power grid. The switching belongs to asynchronous switching, and has the biggest defect that a certain impact is still caused on a power grid and a motor in the switching process.
Disclosure of Invention
In order to solve the technical problems, the utility model aims to provide a control circuit for high-voltage variable-frequency speed regulation and variable-frequency soft start, which is characterized in that hardware such as a reactor and an automatic bypass switch of the reactor is added in a conventional control circuit of a high-voltage frequency converter, control algorithm logic is adjusted to complete automatic cutting or input of the reactor in the circuit according to related instructions, the switching of the high-voltage frequency converter as a speed regulating device or a soft start device is realized, and the bidirectional non-disturbance synchronous switching process from frequency conversion to power frequency and power frequency to frequency conversion can be realized.
The technical problems to be solved by the utility model are realized by adopting the following technical scheme:
a high-voltage variable-frequency speed regulation and soft start control circuit comprises a high-voltage switch in a wire inlet cabinet, a high-voltage switch in a power frequency cabinet, a high-voltage switch in a wire outlet cabinet, a high-voltage switch in a bypass cabinet, a high-voltage frequency converter and a reactor;
the high-voltage frequency converter, the high-voltage switch in the incoming cabinet, the high-voltage switch in the power frequency cabinet, the high-voltage switch in the outgoing cabinet and the high-voltage switch in the bypass cabinet are sequentially connected in series;
the high-voltage switch in the incoming line cabinet is used for connecting a power supply bus and providing power for the frequency converter;
the high-voltage switch in the power frequency cabinet is used for connecting the motor and providing a power frequency power supply for the motor;
the reactor is connected with the high-voltage switch in the bypass cabinet in parallel, the high-voltage switch in the bypass cabinet is used for bypass cutting off the reactor, and the reactor is used for limiting the power grid circulation when the frequency conversion is synchronous and undisturbed in switching, so that the impact on the frequency converter and the power grid power supply is avoided.
As a preferred example, the high voltage switch is a high voltage circuit breaker or a high voltage contactor.
As a preferable example, the high-voltage circuit breaker and the high-voltage contactor are high-voltage vacuum circuit breakers and high-voltage vacuum contactors.
The beneficial effects of the utility model are as follows:
(1) A high-voltage reactor with a certain reactance rate and a high-voltage switch in the form of a high-voltage vacuum breaker or a high-voltage vacuum contactor capable of realizing automatic bypass of the reactor are added in a control circuit of the high-voltage frequency converter, and the high-voltage frequency converter is mutually converted between a speed regulation operation mode or a soft start mode of the frequency converter by controlling the reactor and the bypass switch thereof, and the bidirectional synchronous undisturbed switching from frequency conversion to power frequency and power frequency to frequency conversion is realized; the high voltage reactor can limit or avoid the impact on the current of the high voltage frequency converter, the power supply bus and the motor during the switching process.
(2) When the process requires the motor load to operate at the maximum rated value stage, the frequency conversion driving can be realized to the power frequency driving operation, and the loss electric energy of the frequency converter is saved; when the process needs the motor load to be reduced or the motor load to be low, the speed regulation operation by the power frequency converter is realized, the reactor is cut off at the moment, and the maximization of the system efficiency is realized, so that a large amount of electric energy is saved.
Drawings
FIG. 1 is a schematic diagram of a single-step high voltage variable frequency speed control and soft start control circuit in accordance with an embodiment of the present utility model.
In the figure:
QF1 is a draw-out type vacuum circuit breaker in the incoming cabinet;
QF2 is a draw-out type vacuum circuit breaker in the power frequency cabinet;
QF3 is a draw-out type vacuum circuit breaker in the outlet cabinet;
QF4 is a draw-out type vacuum circuit breaker in the bypass cabinet;
the VFD is a high-voltage frequency converter;
l is a reactor in the reactor cabinet;
m is a high-voltage asynchronous motor.
Detailed Description
The utility model will be further described with reference to the following detailed drawings and examples, in order to make the technical means, the creation features, the achievement of the objects and the effects of the utility model easily understood.
Examples:
in order to better explain the utility model, the embodiment takes the functions of realizing the function of switching from the frequency conversion start to the frequency conversion operation (up-cut) without disturbance when the frequency conversion operation is carried out and the function of switching from the frequency conversion operation (down-cut) without disturbance when the frequency conversion operation is carried out by using a fan or a water pump load matched three-phase asynchronous motor as an example, and adopts the following technical scheme:
FIG. 1 is a one-time wiring diagram of a one-to-one high-voltage variable-frequency speed regulation and soft start control circuit, wherein the rated voltage of a power supply bus is 10kV, and the rated frequency is 50Hz; the rated voltage of the asynchronous motor is 10kV and the rated voltage of the asynchronous motor is 4000kW.
As shown in fig. 1, the high-voltage inverter VFD, the in-line cabinet draw-out vacuum circuit breaker QF1, the power frequency cabinet draw-out vacuum circuit breaker QF2, the in-line cabinet draw-out vacuum circuit breaker QF3 and the bypass cabinet draw-out vacuum circuit breaker QF4 are sequentially connected in series; the draw-out type vacuum circuit breaker QF1 in the wire inlet cabinet is connected to the high-voltage bus to provide power for the frequency converter; the draw-out vacuum breaker QF2 in the power frequency cabinet is connected with the high-voltage asynchronous motor M to provide a power frequency power supply for the motor; the bypass cabinet inner extraction type vacuum circuit breaker QF4 is used for bypassing the cutting reactor L; and L is a reactor in the reactor cabinet and is used for limiting the power grid circulation when the frequency conversion is synchronous and undisturbed, so that the impact on the frequency converter and the power grid power supply is avoided.
Operating logic: the frequency converter has the function of selecting frequency conversion operation and bypass power frequency operation.
1. The variable frequency mode is started and operated: when the motor needs variable frequency operation, a starting command is sent by a background DCS (distributed control system), and after the starting command is received by the frequency converter, the switching-on of QF1 is completed by the frequency converter. The frequency converter is powered on at high voltage, self-checking is ready, no alarm and no fault exist, the frequency converter is combined with QF4, the reactor is cut off, the QF3 is combined at the same time, the frequency converter outputs in an inverted mode, the driving motor operates in a variable frequency mode, and the given frequency is adjusted according to the production process requirement. When the variable frequency starting machine is started, the on-load starting of the compressor unit can be realized, the starting current does not exceed the rated current of the motor, and frequency hopping is realized within the critical rotating speed range.
2. Frequency conversion is started and operated to change the power frequency: when the motor is in variable frequency operation, the motor needs to be switched to power frequency operation (namely 'up-cut'), a background DCS is required to send a variable frequency power frequency cutting instruction, after the frequency converter receives the instruction, the frequency converter divides QF4 and inputs the reactor, the frequency converter automatically operates to 50Hz (at the moment, the frequency is given to be invalid), and the frequency converter automatically detects parameters such as the phase, the voltage, the frequency and the like of the operation of the motor and a power supply system. When the switching requirement is met, the automatic switching is performed to the power frequency operation, QF2 is switched on, QF1 and QF3 are switched off, and the frequency converter is withdrawn.
3. Power frequency operation is switched into a variable frequency mode: if the motor load is reduced or the motor is required to be switched to variable frequency operation (lower cutting) by the power frequency operation when the process is in the power frequency operation, a background DCS is required to send a power frequency switching frequency conversion instruction to the frequency converter, the frequency converter is connected with the line breaker QF1, the high-voltage power supply is powered on, the self-checking is ready, the self-checking is free of alarm and fault, the frequency converter is divided into QF4, the reactor is put into, the frequency is automatically operated to 50Hz (when the frequency is given to be invalid), the frequency converter automatically detects parameters such as the phase, the voltage and the frequency of the output of the frequency converter and the operation of a power supply system, when the switching requirement is met, the QF3 is switched on, the frequency converter is automatically switched to variable frequency operation, the frequency converter is connected with the QF4, the reactor is cut off, and meanwhile the frequency power supply is separated from QF 2.
4. Shutdown mode: when the variable frequency operation is normal and needs to be parked, the background DCS sends a parking instruction to the frequency converter, the frequency converter presses a parking scheme set by a compressor unit process to park in a soft mode, frequency hopping is carried out within a critical rotating speed range, and QF3 and QF1 are broken. When the frequency conversion operation occurs serious faults in the frequency converter, the outgoing line breaker QF3 is abnormally disconnected, the frequency converter is not successfully cut up and down and overtime, or an emergency stop button is pressed down, the frequency converter starts an emergency stop program, and QF3 and QF1 are directly disconnected. When the power frequency operation needs to be stopped, the power frequency dividing breaker QF2 is used for stopping the motor freely, and the power frequency operation is finished.
Interlock logic: the outlet cabinet breaker QF3 is opened, and the outlet cabinet breaker QF1 is allowed to be opened; closing the wire inlet cabinet breaker QF1, and allowing the wire outlet cabinet breaker QF3 to close; the power frequency cabinet breaker QF2 is opened, and the reactor bypass cabinet breaker QF4 is allowed to be closed; the bypass cabinet breaker QF4 of the reactor is opened, and the power frequency cabinet breaker QF2 is allowed to be closed.
The beneficial effects brought by the utility model are as follows:
the high-voltage frequency converter control circuit is added with a high-voltage reactor with a certain reactance rate and a switch in the form of a high-voltage vacuum breaker or a high-voltage vacuum contactor capable of realizing automatic bypass of the reactor, and the high-voltage frequency converter is mutually converted between a speed regulation operation mode or a frequency converter soft start mode by controlling the reactor and a bypass switch thereof, and bidirectional synchronous undisturbed switching from frequency conversion to power frequency and power frequency to frequency conversion is realized.
The technical scheme of the utility model has the greatest advantages that: when the process needs motor load to run in the maximum rated value stage, the variable frequency drive can be realized to convert the variable frequency drive into the power frequency drive, and when the process needs motor load to be reduced or in the low load stage, the power frequency conversion converter can be used for speed regulation, so that the efficiency is maximized, and a large amount of electric energy is saved. But also to limit or avoid current surge effects on the frequency converter, the supply bus and the motor during switching.
The foregoing description and shows the general principles, features and advantages of the utility model. It will be appreciated by persons skilled in the art that the present utility model is not limited to the embodiments described above, but is capable of numerous variations and modifications without departing from the essential spirit and scope of the utility model, which are intended to fall within the scope of the utility model as claimed. The scope of the utility model is defined by the appended claims and equivalents thereof.
Claims (3)
1. The high-voltage variable-frequency speed regulation and soft start control circuit is characterized by comprising a high-voltage switch in a wire inlet cabinet, a high-voltage switch in a power frequency cabinet, a high-voltage switch in a wire outlet cabinet, a high-voltage switch in a bypass cabinet, a high-voltage frequency converter and a reactor;
the high-voltage frequency converter, the high-voltage switch in the incoming cabinet, the high-voltage switch in the power frequency cabinet, the high-voltage switch in the outgoing cabinet and the high-voltage switch in the bypass cabinet are sequentially connected in series;
the high-voltage switch in the incoming line cabinet is used for connecting a power supply bus and providing power for the frequency converter;
the high-voltage switch in the power frequency cabinet is used for connecting the motor and providing a power frequency power supply for the motor;
the reactor is connected with a high-voltage switch in the bypass cabinet in parallel, the high-voltage switch in the bypass cabinet is used for bypass cutting off the reactor, and the reactor is used for limiting the power grid circulation when the variable frequency synchronization is switched in a non-disturbing mode.
2. The circuit of claim 1, wherein the high voltage switch is a high voltage circuit breaker or a high voltage circuit breaker.
3. The circuit of claim 2, wherein the high voltage circuit breaker and the high voltage contactor are high voltage vacuum circuit breakers and high voltage vacuum contactors.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202320446941.2U CN219268755U (en) | 2023-03-10 | 2023-03-10 | High-voltage variable-frequency speed regulation and soft start control circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202320446941.2U CN219268755U (en) | 2023-03-10 | 2023-03-10 | High-voltage variable-frequency speed regulation and soft start control circuit |
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| Publication Number | Publication Date |
|---|---|
| CN219268755U true CN219268755U (en) | 2023-06-27 |
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| CN202320446941.2U Active CN219268755U (en) | 2023-03-10 | 2023-03-10 | High-voltage variable-frequency speed regulation and soft start control circuit |
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| CN (1) | CN219268755U (en) |
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2023
- 2023-03-10 CN CN202320446941.2U patent/CN219268755U/en active Active
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