CN207427023U - A kind of electric terminal drive electric appliance - Google Patents

Abstract

The utility model relates to a power compensation device, more specifically a driving device for a power consumption terminal, comprising a sampling module SIG-E, a main power supply input terminal La, a voltage stabilizing module T, a power supply detection module, and a reference grounding terminal N , a main controller, a compensation switch KM, a compensation module CR and a main power output terminal Lb, the main power input terminal La is connected to a three-phase alternating current, and the power output terminal of the voltage stabilizing module T is connected to the power supply of the sampling module SIG-E The input terminal, the reference ground terminal N and the output terminal of the power detection module are respectively connected to the input terminal of the sampling module SIG-E, and the main power input terminal La is connected to the main power output terminal Lb. The utility model can improve the power factor of the whole power consumption system, can reduce the load current of distribution transformers and distribution lines, thereby reducing useless loss, has high economic use value, is safe and is easy to install.

Description

A driver for electric terminals

technical field

The utility model relates to a power compensation device, in particular to a driving device for a power consumption terminal.

Background technique

At present, my country's total energy consumption is increasing year by year, among which industrial energy consumption accounts for about 70% of the country's total energy consumption, and motors are the main power-consuming terminals in the industrial field, accounting for 75% of the total industrial power consumption. .

There are two working conditions of speed regulation and non-speed regulation in the application of motors, which account for more than 60%. The energy consumption problem of motors that do not require speed regulation is almost ignored by people. Most non-speed regulation motors have simple protection and lack of fault analysis. And records, low-efficiency operation, serious problems of electric energy waste.

At present, it is widely used to install shunt capacitors on the low-voltage outlet side of the transformer in the power distribution room to offset the reactive power loss generated by the inductive load, but it cannot offset the reactive power loss of the motor power supply line, and the entire compensation amount is controlled within a low range (0.9-0.95 ) to avoid overcompensation.

For example, a driver whose patent application number is CN201620742672.4 includes a driver circuit board and peripheral circuits, wherein the driver circuit board includes: a power detection terminal, a power input terminal, a thyristor control terminal, a current transformer terminal, and a cooling fan control terminal. Terminal, voltage stabilizing module T and single-chip microcomputer; the power input terminal is connected to the power input pin of the single-chip microcomputer through the voltage stabilizing module T; the peripheral circuit includes: thyristor switch, reactive power compensation circuit, fuse and inductor; thyristor switch The control end of the thyristor switch is connected to the thyristor control end of the drive circuit board; the input end of the thyristor switch is connected to the fuse; the output end of the thyristor switch is connected to the reactive power compensation circuit; the inductor is connected to the current transformer end; The inductor generates mutual inductance at the connection between the output terminal of the thyristor switch and the reactive power compensation circuit. The utility model cannot accurately perform power compensation according to the working conditions of the electric motor.

Utility model content

The purpose of this utility model is to provide a drive device for power consumption terminals, which can improve the power factor of the entire power consumption system and reduce the load current of distribution transformers and distribution lines, thereby reducing useless losses and reducing the load of the entire power supply line. The temperature rise has high economic use value and improves the safety of power supply lines.

The purpose of this utility model is achieved through the following technical solutions:

A driving device for a power consumption terminal, including a sampling module SIG-E, a main power input terminal La, a voltage stabilizing module T, a power detection module, a reference ground terminal N, a main controller, a compensation switch KM, a compensation module CR and a main power supply The output terminal Lb, the main power input terminal La is connected to the three-phase alternating current, the power supply output terminal of the voltage stabilizing module T is connected to the power supply input terminal of the sampling module SIG-E, the reference ground terminal N and the output of the power detection module The terminals are respectively connected to the input terminals of the sampling module SIG-E, the main power input La is connected with the main power output Lb, the output terminal of the sampling module SIG-E is connected to the main controller, and the output terminal of the main controller is connected to The control end of the compensation switch KM, one end of the compensation switch KM is connected between the power detection module and the output end Lb of the main power supply, and the other end of the compensation switch KM is connected to the compensation module CR.

As a further optimization of this technical solution, the utility model is a drive device for power consumption terminals. The power detection module includes a voltage detection terminal FU and a reactive power detection terminal TA. The input terminal of the voltage detection terminal FU includes three voltage The detection terminal FU, the three voltage detection terminals FU are respectively connected to the three transmission lines of the three-phase alternating current, the reactive power detection terminal TA includes three reactive power detection terminals TA, and the three reactive power detection terminals TA are all provided with Inductance coils, three inductance coils are respectively wrapped on the three transmission lines of the three-phase alternating current on the input terminal La of the main power supply, and the output terminals of the voltage detection terminal FU and the reactive power detection terminal TA are respectively connected to the input terminals of the sampling module SIG-E .

As a further optimization of the technical solution, the utility model is a drive device for a power consumption terminal, wherein an LCD display module is connected to the output end of the sampling module SIG-E.

As a further optimization of the technical solution, the utility model is a drive device for a power consumption terminal, and the input end of the compensation switch KM is provided with a fuse.

As a further optimization of the technical solution, the utility model is a drive device for a power consumption terminal, and a clock timing module is arranged inside the main controller.

As a further optimization of this technical solution, the utility model is a drive device for power consumption terminals. The compensation module CR includes a plurality of compensators, and three sets of compensation capacitors are arranged in the compensators, and the compensation capacitors are composed of multiple capacitors connected in parallel. , the compensation capacitor is connected in parallel with a resistor.

As a further optimization of this technical solution, the utility model is a drive device for power consumption terminals. The input ends of the three sets of compensation capacitors are connected to the compensation switch KM, and the input ends of the first set of compensation capacitors are connected to the third set of compensation capacitors. The output ends are connected, the output ends of the first group of compensation capacitors are connected to the input ends of the second group of compensation capacitors, and the output ends of the second group of compensation capacitors are connected to the input ends of the third group of compensation capacitors.

The beneficial effects of the utility model of a driving device for a power consumption terminal are as follows:

The utility model is a driving device for a power consumption terminal, which is provided with a sampling module SIG-E, a power detection module and a compensation switch KM, which can accurately control the work of the compensation module CR according to the power supply quality and the change of the production process, and can effectively avoid parallel resonance and Harmonic amplification problem; equipped with LCD display module, which can display the working status of the circuit system, current motor load rate, and four-quadrant display power, which is convenient for personnel to view and understand; equipped with a fuse, which can effectively prevent the compensation switch KM or The compensation module CR is damaged; when the motor starts and stops frequently, the main controller interrupts the work of the compensation module CR through the timing function, which can effectively prevent the problem of excessive compensation and motor voltage overload, and can adjust the frequency, voltage, current, power and power factor. , Current/voltage unbalance degree, load nature, voltage/current harmonic distortion rate, demand, phase sequence parameter settings exceed the limit, alarm and record the occurrence time of the alarm event and the running time of the motor.

Description of drawings

Below in conjunction with accompanying drawing and specific implementation method, the utility model is described in further detail.

Fig. 1 is the hardware structure schematic diagram of the present utility model;

Fig. 2 is the overall circuit schematic diagram of the utility model;

Fig. 3 is the circuit schematic diagram of the partial compensation module CR of the present invention;

Fig. 4 is the wiring diagram of the utility model sampling module SIG-E;

Fig. 5 is the pin schematic diagram of main controller of the present utility model;

Fig. 6 is a partial schematic diagram of the communication module between the main controller of the utility model and the sampling module SIG-E;

Fig. 7 is the second schematic diagram of the communication module between the main controller of the utility model and the sampling module SIG-E.

Detailed ways

Below in conjunction with accompanying drawing, the utility model is described in further detail.

Specific implementation mode one:

The present embodiment is described below in conjunction with Fig. 1-6, and the following description is only illustrative, in no way as any restriction to the utility model and its application or use, it should be noted that similar symbols and letters are represented in the following accompanying drawings Similar items.

A driving device for a power consumption terminal, including a sampling module SIG-E, a main power input terminal La, a voltage stabilizing module T, a power detection module, a reference ground terminal N, a main controller, a compensation switch KM, a compensation module CR and a main power supply The output terminal Lb, the La1, La2 and La3 terminals on the input terminal La of the main power supply are respectively connected to the A, B and C three-phase lines of the three-phase alternating current, and the voltage stabilizing module T is used as a system through AC-to-DC rectification and step-down. Weak current power supply, and the voltage stabilizing module T can use processed storage batteries and corresponding voltage stabilizing devices, the power output terminal of the voltage stabilizing module T is connected to the power input terminal of the sampling module SIG-E, the reference ground terminal N and the power detection module The output terminals are respectively connected to the input terminals of the sampling module SIG-E, the reference ground terminal N is used as a reference voltage for measuring the voltage and detecting the sinusoidal frequency spectrum of the alternating current, the input terminal La of the main power supply is connected with the output terminal Lb of the main power supply, and the main power supply The output terminal Lb includes Lb1, Lb2 and Lb3, the output terminal of the sampling module SIG-E is connected to the main controller, and the output terminal of the main controller is connected to the control terminal of the compensation switch KM, and the compensation switch KM is a Changshu CK3 series contact The control signal input terminal of the compensation switch KM is connected to the signal output terminal of the main controller. The compensation switch KM includes 1KM, 2KM, 3KM and 4KM connected in parallel. The sampling module SIG-E calculates the voltage value according to the input data of the power detection module , reactive power and line power factor, and transmit them to the main controller, and the main controller serves as the basis for controlling the compensation switch KM, one end of the compensation switch KM is connected between the power detection module and the main power output terminal Lb, The other end of the compensation switch KM is connected to the compensation module CR; when the input voltage of the power supply is low, in order to ensure the normal operation of the electric motor, the main controller controls the compensation switch KM to be disconnected to prevent the self-healing of the capacitor from being strengthened due to excessive compensation, and the capacity Accelerated losses, premature failure of capacitors and other problems. When the sampling module SIG-E calculates that the system voltage is stable and sufficient for the motor to run, and the reactive power of the motor increases, the main controller controls the compensation switch KM to be turned on, and the compensation module CR is connected to It can supply part of the reactive power consumed by inductive reactance, so as to reduce the load current of distribution transformers and distribution lines; it can reduce the cross-sectional area of wires in distribution lines, reduce the capacity of enterprise distribution transformers, and reduce The active power loss of the distribution transformer and distribution network of the enterprise; since the device is installed at the terminal of the distribution line, it can reduce the transmission loss by reducing the current of the entire power supply line, and has the maximum reactive power economic equivalent; at the same time, the compensation module CR Under the action of the motor, the starting current of the motor can be reduced, the starting loss of the motor can be reduced, and the service life of the motor can be improved. The model of the controller chip used by the main controller is STM32F103C8T6, and the model of the sampling module SIG-E is Acuvim II type three-phase power detection equipment, Acuvim II series multi-functional network power meters are designed with the most modern microprocessor and digital signal processing technology calculated. It integrates comprehensive three-phase power measurement/display, energy accumulation, power quality analysis, fault alarm, trend record, power quality event record, waveform record, time-of-use metering and network communication in one. The large-screen, high-definition liquid crystal display fully meets your visual requirements, and the elegant and bright backlight display enables you to easily check the measurement data in weak light; Acuvim II series products can be used as instruments alone, replacing a large number of traditional analog instruments, It can also be used as the front-end component of the power monitoring system to realize remote data acquisition and control; AcuvimII series instruments have introduced digital signal processing technology, making online power quality analysis possible. The total harmonic distortion rate of each phase voltage and current, voltage crest factor, current coefficient, harmonic components of each order and voltage and current unbalance can be measured in real time, through the RS-485 built-in Acuvim II series multi-function network power meter The communication interface realizes the communication between the main controller and the sampling module SIG-E.

The power detection module includes a voltage detection terminal FU and a reactive power detection terminal TA, the input terminal of the voltage detection terminal FU includes three voltage detection terminals FU1, FU2 and FU3, and three voltage detection terminals FU1, FU2 and FU3 are respectively connected to three transmission lines of three-phase alternating current, and the reactive power detection terminal TA includes three reactive power detection terminals TAa, TAb and TAc, and the three reactive power detection terminals TAa, TAb and TAc are all set There are inductance coils, and the three inductance coils are respectively wrapped on the three transmission lines of the three-phase alternating current on the input terminal La of the main power supply, and the three reactive power detection terminals TAa, TAb and TAc generate corresponding induced electromotive force during the process of electrifying the alternating current , as the sinusoidal spectrum signal of alternating current, the output terminals of the voltage detection terminal FU and the reactive power detection terminal TA are respectively connected to the input terminals of the sampling module SIG-E, and the sampling module SIG-E calculates the circuit power factor through this signal, as Whether the main controller controls the control basis for turning on the compensation switch KM.

The output terminal of the sampling module SIG-E is connected to an LCD display module, and the sampling module SIG-E sends the calculated voltage value, power factor, active work and reactive work values to the LCD display module for display, which is convenient for equipment maintenance personnel to real-time View and understand the working status of the system.

The input terminals of the compensation switch KM are provided with fuses 1FU and 2FU, so as to protect the capacitors in the compensation module CR from being broken down by overload current, which can protect the compensation switch KM and the compensation module CR, and improve the capacitance of the compensation module CR. service life.

For the motor that needs to be started and stopped frequently, because the motor is switched between the two phases of the power supply or is started or stopped quickly and frequently, when the power is cut off, the motor still runs at a high speed due to inertia, and the capacitor used for compensation becomes the magnetic current of the motor through discharge. Make the motor work in the state of generating electricity. At this time, the voltage sent by the motor is generally different from the power supply voltage that is immediately input, and a large impact torque will be generated in an instant, thereby causing damage to the compensation module CR and the motor. In order to avoid such problems, the utility model described The main controller is equipped with a clock timing module. The main controller records the starting and stopping time of the motor, and accumulates the time through the clock timing module. The time threshold Tmin is added to the control program of the main controller, such as the second start time of the motor and the previous time of the motor. If the difference between the first stop time and the time threshold Tmin is less than the time threshold Tmin, the compensation switch KM is controlled to be disconnected, and the compensation module CR does not participate in the work this time; if the difference between the second start time of the motor and the previous stop time of the motor is greater than the time threshold Tmin, then Control and turn on the compensation switch KM to make the compensation module CR work normally; the time threshold Tmin should be enough to compensate the internal resistance of the compensation module CR to completely consume the capacitor power in the compensation module CR; frequency, voltage, current, power, power factor, current When the parameter settings of /voltage unbalance degree, load property, voltage/current harmonic distortion rate, demand, and phase sequence exceed the limit, an alarm will be issued and the occurrence time of the alarm event and the running time of the motor will be recorded.

The compensation module CR includes a plurality of compensators, and three sets of compensation capacitors are arranged in the compensators, and the compensation capacitors are composed of multiple capacitors connected in parallel, and resistors are connected in parallel on the compensation capacitors; when the reactive power in the circuit increases, the compensation module CR starts to work, multiple capacitors are charged and discharged continuously, and most of the reactive current required by the motor is supplied by multiple capacitors, so as to improve the power factor of the entire power supply line, and the parallel resistance on the compensation capacitor is used to stop the motor It consumes the electric energy stored in the capacitor and prevents the voltage overload of the motor caused by the superposition of the two voltages when the power is next turned on.

The input terminals of the three groups of compensation capacitors are connected to the compensation switch KM, the input terminals of the first group of compensation capacitors are connected to the output terminals of the third group of compensation capacitors, and the output terminals of the first group of compensation capacitors are connected to the input terminals of the second group of compensation capacitors. The output terminals of the second group of compensation capacitors are connected to the input terminals of the third group of compensation capacitors, so as to improve the charging and discharging efficiency of each capacitor and facilitate the rapid consumption of electric energy stored in the capacitors during shutdown.

The utility model is a driving device for power consumption terminals. Its working principle is as follows: the device is installed at the inlet end of the power consumption motor. When the power input voltage is low, in order to ensure the normal operation of the power consumption motor, the main controller controls The compensation switch KM is disconnected to prevent a series of problems such as self-healing of the capacitor caused by excessive compensation, accelerated capacity loss, and early failure of the capacitor. When the main controller calculates that the system voltage is stable and sufficient for the motor to run, and the motor reactive power increases, The main controller controls the compensation switch KM to be turned on, and the compensation module CR is connected to the circuit, which can supply part of the reactive power consumed by the inductive reactance, thereby reducing the load current of the distribution transformer and the distribution line; reducing the load current of the distribution line The cross-sectional area of the wire can reduce the capacity of the enterprise's distribution transformer, reduce the active power loss of the enterprise's distribution transformer and distribution network; since the device is installed at the terminal of the distribution line, it can reduce the transmission loss by reducing the current of the entire power supply line, It has the maximum reactive power economic equivalent; at the same time, under the action of the compensation module CR, it can reduce the starting current of the motor, reduce the starting loss of the motor, and help to improve the service life of the motor; for frequent starting and stopping of the motor, because the motor is in the When the two phases of the power supply are switched or started or stopped quickly and frequently, when the power is cut off, the motor still runs at a high speed due to inertia, and the capacitor used for compensation becomes the magnetic current of the motor through discharge, so that the motor works in the power generation state. At this time, the voltage sent by the motor is generally different from the power supply voltage that is immediately input, and a large impact torque will be generated in an instant, thereby causing damage to the compensation module CR and the motor. In order to avoid such problems, the utility model described The main controller is equipped with a clock timing module. The main controller records the starting and stopping time of the motor, and accumulates the time through the clock timing module. The time threshold Tmin is added to the control program of the main controller, such as the second start time of the motor and the previous time of the motor. If the difference between the first stop time and the time threshold Tmin is less than the time threshold Tmin, the compensation switch KM is controlled to be disconnected, and the compensation module CR does not participate in the work this time; if the difference between the second start time of the motor and the previous stop time of the motor is greater than the time threshold Tmin, then The compensation switch KM is controlled to be turned on to make the compensation module CR work normally; the time threshold Tmin should be enough to compensate the internal resistance of the compensation module CR to completely consume the electric capacity of the capacitor in the compensation module CR.

Of course, the above descriptions are not limitations of the present utility model, and the present utility model is not limited to the above-mentioned examples. Changes, modifications, additions or replacements made by those of ordinary skill in the art within the essential scope of the present utility model also belong to Protection scope of the present utility model.

Claims (7)

1. a kind of electric terminal is with electric appliance is driven, including sampling module SIG-E, main power source input terminal La, Voltage stabilizing module T, power supply inspection Survey module, reference ground end N, master controller, compensating switch KM, compensating module CR and main power source output terminal Lb, it is characterised in that： The main power source input terminal La accesses three-phase alternating current, the power output end connection sampling module SIG-E's of the Voltage stabilizing module T The output terminal of power input, the reference ground end N and power detecting module connects respectively with the input terminal of sampling module SIG-E It connects, the main power source input terminal La is connected with main power source output terminal Lb, the output terminal connection main control of the sampling module SIG-E Device, the control terminal of the output terminal connection compensating switch KM of master controller, one end of the compensating switch KM is connected to power detecting Between module and main power source output terminal Lb, the other end connection compensating module CR of the compensating switch KM.

2. a kind of electric terminal according to claim 1 drive electric appliance, it is characterised in that：The power detecting module includes The input terminal of voltage detecting end FU and idle test side TA, the voltage detecting end FU include three voltage detecting end FU, three A voltage detecting end FU connects three power transmission lines of three-phase alternating current on main power source input terminal La, the idle test side respectively TA includes three idle test side TA, and three idle test side TA are both provided with inductance coil, three inductance coil difference It is wrapped on three power transmission lines of three-phase alternating current, the output terminal of the voltage detecting end FU and idle test side TA connect respectively The input terminal of sampling module SIG-E.

3. a kind of electric terminal according to claim 1 drive electric appliance, it is characterised in that：The sampling module SIG-E's Output terminal is connected with LCD display module.

4. a kind of electric terminal according to claim 1 drive electric appliance, it is characterised in that：The input of the compensating switch KM End is provided with fuse.

5. a kind of electric terminal according to claim 1 drive electric appliance, it is characterised in that：It is set inside the master controller There is clock timing module.

6. a kind of electric terminal according to claim 1 drive electric appliance, it is characterised in that：The compensating module CR includes more A compensator is provided with three groups of compensating electric capacities in compensator, and the compensating electric capacity is composed in parallel by multiple capacitances, in compensating electric capacity It is connected in parallel to resistance.

7. a kind of electric terminal according to claim 6 drive electric appliance, it is characterised in that：Three groups of compensating electric capacities it is defeated Entering end to be connected with compensating switch KM, the input terminal of first group of compensating electric capacity is connected with the output terminal of the 3rd group of compensating electric capacity, and first The output terminal of group compensating electric capacity is connected with the input terminal of second group of compensating electric capacity, the output terminal of second group of compensating electric capacity and the 3rd group The input terminal connection of compensating electric capacity.