CN106357199B - Electrical machine energy-saving control system and power-economizing method - Google Patents
Electrical machine energy-saving control system and power-economizing method Download PDFInfo
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Abstract
The present invention relates to a kind of electric regulating systems, more particularly to a kind of electrical machine energy-saving control system, including adjusting unit, power supply is powered by adjusting unit for electrical-coil, electrical-coil is correspondingly provided with isolation current sampling circuit and isolation voltage sample circuit, current signal and the positive and negative of voltage signal distinguish rectified circuit rectifies to be exported to controller after positive value to waveform, and controller output pin is connected to adjusting unit；A kind of power-economizing method is further related to, specially：In real time after the real-time current and voltage of detection electrical-coil, by collected real-time current and voltage it is positive and negative to waveform after rectification circuit difference is whole for positive value output to controller, controller calculates the input voltage provided for motor by PID adjusting adjusting units after electric efficiency, it is made to match with output power of motor.The present invention can detect electric efficiency in real time so that power input to machine follows the variation of output power of motor and changes, and ensures that motor always works in high efficient area, reduces energy consumption.
Description
Technical field
The present invention relates to a kind of electric regulating systems, and in particular to a kind of electrical machine energy-saving control system and power-economizing method.
Background technology
With the rapid development of China's industrial and agricultural production, the demand of electric energy is increasing, and exploitation has become with energy saving
The task of top priority.As a kind of important power-equipment, the electricity consumption of asynchronous motor is very big.These asynchronous motors one
As be all to carry out selection according to the load of design, but in actual use, be mostly often in underloading, or even transported under zero load
Row.Therefore, the phenomenon that " low load with strong power ", is almost very common.
Currently, being continued to develop in China's industrial production, it is becoming tight energy day, in the case that environmental requirement is increasingly surging, carries
High motor operation efficiency can greatly alleviate energy shortage situation, improve national economic profit, and there is highly important reality to anticipate
Justice.In order to improve the working efficiency of motor, design and manufacture, the selection use of motor, power grid of the countries in the world from motor for many years
Several aspects such as power supply management are started with, and a lot of research work has been made, and achieve preferable achievement.Wherein from the design and manufacture of motor
Aspect is started with, and high-efficiency energy-saving motor is had developed, and efficiency is made to significantly improve, can be a large amount of energy saving.But this motor cost is higher,
And economic effect greatly depends on the case where load, i.e., for long-term work in nominal load, the applied field of continuous operation
It closes, energy-saving effect can reach best.But for most of motor users, the motor on existing equipment how to be made to work in effect
The higher state of rate seems more real.
Invention content
In order to solve the above technical problems, it is an object of the invention to：A kind of electrical machine energy-saving control system and energy-saving square are provided
Method can detect electric efficiency in real time so that power input to machine follows the variation of output power of motor and changes, and ensures motor
High efficient area is always worked in, energy consumption is reduced.
The present invention is that technical solution used by solving its technical problem is：
The electrical machine energy-saving control system, including unit is adjusted, power supply is powered by adjusting unit for electrical-coil, motor
Coil is correspondingly provided with isolation current sampling circuit and isolation voltage sample circuit, the current signal of isolation current sampling circuit acquisition
Positive waveform and negative sense waveform divide two-way to export to A/D inside controller after current rectification circuit rectifies are positive value respectively to turn
TI+, TI- pin changed, the positive waveform and negative sense waveform of the voltage signal of isolation voltage sample circuit acquisition are respectively by voltage
Rectifier circuit rectifies are that two-way is divided to export to TU+, TU- pin of A/D conversions inside controller, controller output pin after
It is connected to adjusting unit.
Power supply of the present invention by adjust unit be electrical-coil power, adjusting unit can with the input voltage of regulation motor,
Under working condition, the operating current and terminal voltage of electrical-coil sample electricity by the way that current sampling circuit and isolation voltage is isolated respectively
Road is acquired, and collected electric current and voltage signal include that forward signal also includes negative-going signal, if, directly by acquisition
Current or voltage signal is sent to controller, and controller needs to identify that the positive and negative needs of current or voltage take a substantial amount of time,
To save data transmission and calculating the time, before electric current and voltage signal are sent into controller, first pass through current rectification electricity respectively
Electric current and voltage signal whole rectification are forward signal by road and voltage rectifying circuit, and by it is positive and negative pass through to signal it is different
Pin is acquired discrete acquisitions, specially：
Controller carries out discrete sampling to the numerical value for representing voltage positive value, obtains numerical value Un+, (n=1,2,3 ..., N；N=
32、64、128、256)；Controller carries out discrete sampling to the numerical value for representing voltage negative value, obtains numerical value Un-, (n=1,2,
3 ..., N；N=32,64,128,256)；Controller carries out discrete sampling to the numerical value for representing electric current positive value, obtains numerical value In+, (n
=1,2,3 ..., N；N=32,64,128,256)；Controller carries out discrete sampling to the numerical value for representing electric current negative value, obtains numerical value
In-, (n=1,2,3 ..., N；N=32,64,128,256)；Wherein, sampling period Tp=20ms/N (N=32,64,128,
256)；Controller completes following calculating：
S=(U1+) (I1+)+(U2+) (I2+)+... ..+ (UN+) (IN+)+(U1-) (I1-)+(U2-) (I2-)+... ..+
(UN-)(IN-)+(U1+)(I1-)+(U2+)(I2-)+…..+(UN+)(IN-)+(U1-)(I1+)+(U2-)(I2+)+…..+
(UN-) (IN+), wherein (N=32,64,128,256)；
P=(U1+) (I1+)+(U2+) (I2+)+... ..+ (UN+) (IN+)+(U1-) (I1-)+(U2-) (I2-)+... ..+
(UN-)(IN-)-((U1+)(I1-)+(U2+)(I2-)+…..+(UN+)(IN-)+(U1-)(I1+)+(U2-)(I2+)+…..+
(UN-) (IN+)), wherein (N=32,64,128,256)；
Electric efficiency η=KCOS φ+X1=KP/S+X1, wherein K indicate that equivalent coefficient, X1 indicate correction value；It obtains
After electric efficiency, input voltage of the unit to motor is adjusted by PID, so that power input to a machine and output work
Rate matches, and saves energy consumption.
Wherein, preferred embodiment is：
The unit that adjusts includes the thyristor T1 and thyristor T2 of reverse parallel connection, the thyristor T3 of reverse parallel connection and brilliant lock
The thyristor T5 and thyristor T6 of pipe T4 and reverse parallel connection, power end R, S, T pass through thyristor T1 and thyristor T2, crystalline substance respectively
Brake tube T3 and thyristor T4, thyristor T5 and thyristor T6 are in turn connected to the three-phase coil of motor, and corresponding thyristor T1-T6 is set
Driving circuit is set, driving circuit input terminal is connected to controller output end, and controller adjusts thyristor output by driving circuit
Voltage, and then the input voltage of regulation motor coil, using digital trigger technology, three-phase equilibrium degree is high, and driving adjusts circuit and adopts
It can be realized with available circuit structure, and will not be described here in detail.
Described further includes touch display screen, and the touch display screen is connected in controller, can be aobvious by touch display screen
Show current motor efficiency, input voltage, operating current, apparent energy, active power, reactive power, power factor etc. can also
Each running parameter of motor is adjusted by touch display screen, to ensure motor smooth starting, soft start can be used.
The power supply is powered by adjusting unit or contactor for electrical-coil, and adjusting unit is in parallel with contactor, is adjusting
When saving cell failure, motor current supply circuit can be connected by contactor, ensure that motor being capable of normal operation.
Further include control button, the control button is connected in controller, and control button includes digital keys, start and stop key
Deng, can pass through control button set motor parameters, electrical machine energy-saving amount setting, minimum setting, PID parameters
Setting etc..
The power supply is correspondingly provided with synchronous sampling circuit, and synchronous sampling circuit output end is connected to controller, and controller can
Detection external electrical network voltage parameter in real time, and minimum voltage set by user can automatically be adjusted according to external electrical network parameter
It is whole, specifically, when detecting that external electrical network voltage rises, according to the ratio that external electrical network voltage rises, to set by user
Minimum voltage carries out decline in proportion；Conversely, when detecting that external voltage declines, according to the ratio of external electrical network voltage decline
Example carries out rising in proportion to minimum voltage set by user, and to ensure the constant of real output value, synchronous sampling circuit is adopted
With available circuit structure.
The present invention also provides a kind of power-economizing methods based on above-mentioned electrical machine energy-saving control system, specially：
The first step, power supply are powered for motor by adjusting unit, are acquired by current sampling circuit and voltage sample circuit
The real-time current and voltage of electrical-coil；
Second step, the positive waveform and negative sense waveform of collected real-time current are after current rectification circuit is whole for positive value
It is exported respectively to TI+, TI- pin of A/D conversions inside controller；The positive waveform and negative sense waveform of collected real-time voltage
It is exported respectively after voltage rectifying circuit is whole for positive value to TU+, TU- pin of A/D conversions inside controller；
Third walks, and controller calculates electric efficiency by the electric current and voltage signal received；
4th step, according to electric efficiency, it is the input voltage that motor provides to adjust unit by PID, makes itself and electricity
Machine output power matches.
The third walks implementation procedure：
Controller carries out discrete sampling to the numerical value for representing voltage positive value, obtains numerical value Un+, (n=1,2,3 ... .N；N=
32、64、128、256)；Controller carries out discrete sampling to the numerical value for representing voltage negative value, obtains numerical value Un-, (n=1,2,
3….N；N=32,64,128,256)；Controller carries out discrete sampling to the numerical value for representing electric current positive value, obtains numerical value In+, (n
=1,2,3 ... .N；N=32,64,128,256)；Controller carries out discrete sampling to the numerical value for representing electric current negative value, obtains numerical value
In-, (n=1,2,3 ... .N；N=32,64,128,256)；Wherein, sampling period Tp=20ms/N (N=32,64,128,
256)；Controller completes following calculating：
S=(U1+) (I1+)+(U2+) (I2+)+... ..+ (Un+) (In+)+(U1-) (I1-)+(U2-) (I2-)+... ..+
(Un-)(In-)+(U1+)(I1-)+(U2+)(I2-)+…..+(Un+)(In-)+(U1-)(I1+)+(U2-)(I2+)+…..+
(Un-) (In+), wherein (n=32,64,128,256)；
P=(U1+) (I1+)+(U2+) (I2+)+... ..+ (Un+) (In+)+(U1-) (I1-)+(U2-) (I2-)+... ..+
(Un-)(In-)-((U1+)(I1-)+(U2+)(I2-)+…..+(Un+)(In-)+(U1-)(I1+)+(U2-)(I2+)+…..+
(Un-) (In+)), wherein (n=32,64,128,256)；
Electric efficiency η=KCOS φ+X1=KP/S+X1, wherein K indicate that equivalent coefficient, X1 indicate correction value.
The unit that adjusts includes the thyristor T1 and thyristor T2 of reverse parallel connection, the thyristor T3 of reverse parallel connection and brilliant lock
The thyristor T5 and thyristor T6 of pipe T4 and reverse parallel connection, power end R, S, T pass through thyristor T1 and thyristor T2, crystalline substance respectively
Brake tube T3 and thyristor T4, thyristor T5 and thyristor T6 are in turn connected to the three-phase coil of motor, and corresponding thyristor T1-T6 is set
Driving circuit is set, driving circuit input terminal is connected to controller output end, and controller adjusts circuit regulation motor by driving
Input voltage is to target adjustment value.
If detecting negative power factor, i.e. motor falls under power generation situation, can automatically switch to adjusting unit and be connected entirely,
Avoid impact of the motor to each device in adjusting unit.
Compared with prior art, the invention has the advantages that：
The present invention can detect electric efficiency in real time, by regulation motor terminal voltage, adjust power input to machine, make motor
Input power follows the variation of output power of motor and changes always, to make motor always work in high efficient area, reaches section
It can purpose；It is verified, empty load of motor economize on electricity reachable 50%~70% or so, overall economize on electricity reachable 15%~35% or so, motor
Power grade is from several kilowatts to several megawatts, and voltage class is from 380VAC to 10 kilovolt or more.
Description of the drawings
Fig. 1 is 1 schematic diagram of embodiment.
Fig. 2 is to adjust unit and motor connection circuit diagram.
Fig. 3 is current rectification circuit and voltage rectifying circuit circuit diagram.
Specific implementation mode
The embodiment of the present invention is described further below in conjunction with the accompanying drawings：
Embodiment 1：
As shown in Figure 1, electrical machine energy-saving control system of the present invention, including unit is adjusted, power supply is by adjusting unit
Electrical-coil is powered, and electrical-coil is correspondingly provided with isolation current sampling circuit and isolation voltage sample circuit, and current sampling is isolated
The positive waveform and negative sense waveform of the current signal of circuit acquisition divide two-way defeated after current rectification circuit rectifies are positive value respectively
Go out to TI+, TI- pin of A/D conversions inside controller, the positive waveform of the voltage signal of isolation voltage sample circuit acquisition and
Voltage rectifying circuit rectification is respectively that two-way is divided to export to TU+, TU- of A/D conversions inside controller after by negative sense waveform
Pin, controller output pin are connected to adjusting unit.
As shown in Fig. 2, left-hand broken line frame indicates to adjust unit in figure, right side dotted line frame indicates electrical-coil, adjusts unit
The crystalline substance of the thyristor T3 and thyristor T4 and reverse parallel connection of thyristor T1 and thyristor T2, reverse parallel connection including reverse parallel connection
Brake tube T5 and thyristor T6, power end R, S, T pass through thyristor T1 and thyristor T2, thyristor T3 and thyristor T4, crystalline substance respectively
Brake tube T5 and thyristor T6 is in turn connected to the three-phase coil of motor, and driving circuit, driving circuit is arranged in corresponding thyristor T1-T6
Input terminal is connected to controller output end, and controller adjusts thyristor output voltage, and then regulation motor line by driving circuit
The input voltage of circle, using digital trigger technology, three-phase equilibrium degree is high, and driving adjusts circuit can be real using available circuit structure
Existing, and will not be described here in detail.
The present embodiment further includes touch display screen and control button, and the touch display screen is connected in controller, can lead to
It crosses touch display screen and shows current motor efficiency, input voltage, operating current, apparent energy, active power, reactive power, work(
Rate factor etc. can also be adjusted each running parameter of motor by touch display screen, to ensure motor smooth starting, can adopt
Use soft start；The control button is connected in controller, and control button includes digital keys, start and stop key etc., can be pressed by control
Key assignments motor parameters, the setting of electrical machine energy-saving amount, minimum setting, PID parameters setting etc.；Power supply passes through
It adjusts unit or contactor to power for electrical-coil, adjusting unit is in parallel with contactor, can be by connecing when adjusting cell failure
Tentaculum connects motor current supply circuit, ensures that motor being capable of normal operation；Power supply is correspondingly provided with synchronous sampling circuit, synchronized sampling electricity
Road output end is connected to controller, and controller can detect external voltage electrical network parameter in real time, and can be according to external electrical network parameter, electricity
Source is correspondingly provided with synchronous sampling circuit, and synchronous sampling circuit output end is connected to controller, and controller can detect external electrical in real time
Net voltage parameter, and minimum voltage set by user can be automatically adjusted according to external electrical network parameter, specifically, when inspection
When measuring the rising of external electrical network voltage, according to the ratio that external electrical network voltage rises, minimum voltage set by user is carried out same
The decline of ratio；Conversely, when detecting that external voltage declines, according to the ratio that external electrical network voltage declines, user is set
Minimum voltage carry out rising in proportion, to ensure that the constant of real output value, synchronous sampling circuit use available circuit knot
Structure；For convenience of this equipment between external equipment data communication, can in order to control device setting peripheral hardware RS485 interfaces, can also
Setting wireless communication module carries out data transmission, for example, 2/3/4G modules.
As shown in figure 3, Iin is to adjust unit to be output to input of the electric current of motor after isolation, Uin is that adjusting unit is defeated
Go out input of the voltage to motor after isolation, U1, U2, U3, U4, U5, U6 are 6 operational amplifiers, and R, R1 are resistance, R=
2R1, D1-D8 are diode, and Iin is inputted after such as figure processing of circuit, exports 2 tunnels, referred to as In-, In+ respectively；Uin is inputted through such as
After figure processing of circuit, 2 tunnels, referred to as Un-, Un+ are exported respectively；M1 devices in order to control can select internal have A/D converter
MCU or dsp chip；In-, In+, Un-, Un+ are connected respectively to the TI-, TI+, TU- of A/D conversions inside M1, and TU+ pins are above-mentioned
Electric current and voltage difference rectification are two-way positive value signal by rectification circuit, are sent directly to controller and are handled, accelerate control
The processing speed of device.
Power supply of the present invention by adjust unit be electrical-coil power, adjusting unit can with the input voltage of regulation motor,
Under working condition, the operating current and terminal voltage of electrical-coil sample electricity by the way that current sampling circuit and isolation voltage is isolated respectively
Road is acquired, and collected electric current and voltage signal include that forward signal also includes negative-going signal, if, directly by acquisition
Current or voltage signal is sent to controller, and controller needs to identify that the positive and negative needs of current or voltage take a substantial amount of time,
To save data transmission and calculating the time, before electric current and voltage signal are sent into controller, first pass through current rectification electricity respectively
Electric current and voltage signal whole rectification are forward signal by road and voltage rectifying circuit, and by it is positive and negative pass through to signal it is different
Pin is acquired discrete acquisitions, specially：
Controller carries out discrete sampling to the numerical value for representing voltage positive value, obtains numerical value Un+, (n=1,2,3 ..., N；N=
32、64、128、256)；Controller carries out discrete sampling to the numerical value for representing voltage negative value, obtains numerical value Un-, (n=1,2,
3 ..., N；N=32,64,128,256)；Controller carries out discrete sampling to the numerical value for representing electric current positive value, obtains numerical value In+, (n
=1,2,3 ..., N；N=32,64,128,256)；Controller carries out discrete sampling to the numerical value for representing electric current negative value, obtains numerical value
In-, (n=1,2,3 ..., N；N=32,64,128,256)；Wherein, sampling period Tp=20ms/N (N=32,64,128,
256)；Controller completes following calculating：
S=(U1+) (I1+)+(U2+) (I2+)+... ..+ (UN+) (IN+)+(U1-) (I1-)+(U2-) (I2-)+... ..+
(UN-)(IN-)+(U1+)(I1-)+(U2+)(I2-)+…..+(UN+)(IN-)+(U1-)(I1+)+(U2-)(I2+)+…..+
(UN-) (IN+), wherein (N=32,64,128,256)；
P=(U1+) (I1+)+(U2+) (I2+)+... ..+ (UN+) (IN+)+(U1-) (I1-)+(U2-) (I2-)+... ..+
(UN-)(IN-)-((U1+)(I1-)+(U2+)(I2-)+…..+(UN+)(IN-)+(U1-)(I1+)+(U2-)(I2+)+…..+
(UN-) (IN+)), wherein (N=32,64,128,256)；
Electric efficiency η=KCOS φ+X1=KP/S+X1, wherein K indicate that equivalent coefficient, X1 indicate correction value；It obtains
After electric efficiency, input voltage of the unit to motor is adjusted by PID, so that power input to a machine and output work
Rate matches, and saves energy consumption.
Embodiment 2：
The present embodiment provides a kind of power-economizing method described in embodiment on the basis of electrical machine energy-saving control system, specially：
The first step, power supply are powered for motor by adjusting unit, are acquired by current sampling circuit and voltage sample circuit
The real-time current and voltage of electrical-coil；
Second step, the positive waveform and negative sense waveform of collected real-time current are after current rectification circuit is whole for positive value
It is exported respectively to TI+, TI- pin of A/D conversions inside controller；The positive waveform and negative sense waveform of collected real-time voltage
It is exported respectively after voltage rectifying circuit is whole for positive value to TU+, TU- pin of A/D conversions inside controller；
Third walks, and controller calculates electric efficiency by the electric current and voltage signal received；
4th step, according to electric efficiency, it is the input voltage that motor provides to adjust unit by PID, makes itself and electricity
Machine output power matches.
The third walks implementation procedure：
Controller carries out discrete sampling to the numerical value for representing voltage positive value, obtains numerical value Un+, (n=1,2,3 ... .N；N=
32、64、128、256)；Controller carries out discrete sampling to the numerical value for representing voltage negative value, obtains numerical value Un-, (n=1,2,
3….N；N=32,64,128,256)；Controller carries out discrete sampling to the numerical value for representing electric current positive value, obtains numerical value In+, (n
=1,2,3 ... .N；N=32,64,128,256)；Controller carries out discrete sampling to the numerical value for representing electric current negative value, obtains numerical value
In-, (n=1,2,3 ... .N；N=32,64,128,256)；Wherein, sampling period Tp=20ms/N (N=32,64,128,
256)；Controller completes following calculating：
S=(U1+) (I1+)+(U2+) (I2+)+... ..+ (Un+) (In+)+(U1-) (I1-)+(U2-) (I2-)+... ..+
(Un-)(In-)+(U1+)(I1-)+(U2+)(I2-)+…..+(Un+)(In-)+(U1-)(I1+)+(U2-)(I2+)+…..+
(Un-) (In+), wherein (n=32,64,128,256)；
P=(U1+) (I1+)+(U2+) (I2+)+... ..+ (Un+) (In+)+(U1-) (I1-)+(U2-) (I2-)+... ..+
(Un-)(In-)-((U1+)(I1-)+(U2+)(I2-)+…..+(Un+)(In-)+(U1-)(I1+)+(U2-)(I2+)+…..+
(Un-) (In+)), wherein (n=32,64,128,256)；
Electric efficiency η=KCOS φ+X1=KP/S+X1, wherein K indicate that equivalent coefficient, X1 indicate correction value.
The unit that adjusts includes the thyristor T1 and thyristor T2 of reverse parallel connection, the thyristor T3 of reverse parallel connection and brilliant lock
The thyristor T5 and thyristor T6 of pipe T4 and reverse parallel connection, power end R, S, T pass through thyristor T1 and thyristor T2, crystalline substance respectively
Brake tube T3 and thyristor T4, thyristor T5 and thyristor T6 are in turn connected to the three-phase coil of motor, and corresponding thyristor T1-T6 is set
Driving circuit is set, driving circuit input terminal is connected to controller output end, and controller adjusts circuit regulation motor by driving
Input voltage is to target adjustment value.
If detecting negative power factor, i.e. motor falls under power generation situation, can automatically switch to adjusting unit and be connected entirely,
Avoid impact of the motor to each device in adjusting unit.
The present invention can detect electric efficiency in real time, by regulation motor terminal voltage, adjust power input to machine, make motor
Input power follows the variation of output power of motor and changes always, to make motor always work in high efficient area, reaches section
It can purpose；It is verified, empty load of motor economize on electricity reachable 50%~70% or so, overall economize on electricity reachable 15%~35% or so, motor
Power grade is from several kilowatts to several megawatts, and voltage class is from 380VAC to 10 kilovolt or more.
Claims (6)
1. a kind of electrical machine energy-saving control system, which is characterized in that including adjusting unit, power supply is electrical-coil by adjusting unit
Power supply, electrical-coil are correspondingly provided with isolation current sampling circuit and isolation voltage sample circuit, isolation current sampling circuit acquisition
Current signal positive waveform and negative sense waveform respectively through current rectification circuit rectifies be positive value after divide two-way to export to control
TI+, TI- pin of A/D conversions inside device, the positive waveform and negative sense waveform of the voltage signal of isolation voltage sample circuit acquisition
Two-way is divided to export to TU+, TU- pin of A/D conversions inside controller, control after voltage rectifying circuit rectification is positive value respectively
Device output pin is connected to adjusting unit；
The power-economizing method of the electrical machine energy-saving control system is specially：
The first step, power supply are powered by adjusting unit for motor, and motor is acquired by current sampling circuit and voltage sample circuit
The real-time current and voltage of coil；
Second step, the positive waveform and negative sense waveform of collected real-time current are distinguished after current rectification circuit is whole for positive value
It exports to TI+, TI- pin of A/D conversions inside controller；The positive waveform and negative sense waveform of collected real-time voltage pass through
Whole voltage rectifying circuit is to be exported respectively after to TU+, TU- pin of A/D conversions inside controller；
Third walks, and controller calculates electric efficiency by the electric current and voltage signal received；
4th step, according to electric efficiency, it is the input voltage that motor provides to adjust unit by PID, keeps it defeated with motor
Go out power to match；
The third walks implementation procedure：
Controller carries out discrete sampling to the numerical value for representing voltage positive value, obtains numerical value Un+, (n=1,2,3 ..., N；N=32,
64、128、256)；Controller carries out discrete sampling to the numerical value for representing voltage negative value, obtains numerical value Un-, (n=1,2,3 ..., N；
N=32,64,128,256)；Controller carries out discrete sampling to the numerical value for representing electric current positive value, obtains numerical value In+, (n=1,2,
3 ..., N；N=32,64,128,256)；Controller carries out discrete sampling to the numerical value for representing electric current negative value, obtains numerical value In-, (n
=1,2,3 ..., N；N=32,64,128,256)；Wherein, (N=32,64,128,256) sampling period Tp=20ms/N；Control
Device completes following calculating：
S=(U1+) (I1+)+(U2+) (I2+)+... ..+ (UN+) (IN+)+(U1-) (I1-)+(U2-) (I2-)+... ..+ (UN-)
(IN-)+(U1+)(I1-)+(U2+)(I2-)+…..+(UN+)(IN-)+(U1-)(I1+)+(U2-)(I2+)+…..+(UN-)
(IN+), wherein (N=32,64,128,256)；
P=(U1+) (I1+)+(U2+) (I2+)+... ..+ (UN+) (IN+)+(U1-) (I1-)+(U2-) (I2-)+... ..+ (UN-)
(IN-)-((U1+)(I1-)+(U2+)(I2-)+…..+(UN+)(IN-)+(U1-)(I1+)+(U2-)(I2+)+…..+(UN-)
(IN+)), wherein (N=32,64,128,256)；
Electric efficiency η=KCOS φ+X1=KP/S+X1, wherein φ indicates that the phase difference between voltage and electric current, K indicate
Equivalent coefficient, X1 indicate correction value.
2. electrical machine energy-saving control system according to claim 1, which is characterized in that the adjusting unit includes reverse parallel connection
Thyristor T1 and thyristor T2, the thyristor T3 of reverse parallel connection and thyristor T4 and reverse parallel connection thyristor T5 and brilliant lock
Pipe T6, power end R, S, T pass through thyristor T1 and thyristor T2, thyristor T3 and thyristor T4, thyristor T5 and brilliant lock respectively
Pipe T6 is in turn connected to the three-phase coil of motor, and driving circuit is arranged in corresponding thyristor T1-T6, and driving circuit input terminal is connected to
Controller output end.
3. electrical machine energy-saving control system according to claim 1, which is characterized in that further include touch display screen, it is described to touch
Display screen is touched in controller to be connected.
4. electrical machine energy-saving control system according to claim 1, which is characterized in that the power supply is by adjusting unit or connecing
Tentaculum is powered for electrical-coil, and it is in parallel with contactor to adjust unit.
5. electrical machine energy-saving control system according to claim 1, which is characterized in that further include control button, the control
Button is connected in controller.
6. electrical machine energy-saving control system according to claim 1, which is characterized in that the power supply is correspondingly provided with synchronized sampling
Circuit, synchronous sampling circuit output end are connected to controller.
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| CN108872850A (en) * | 2017-10-25 | 2018-11-23 | 中国石油化工股份有限公司 | A kind of electrical machine energy-saving key technology test platform |
| CN108039846A (en) * | 2017-12-23 | 2018-05-15 | 江西省洛锡实业有限公司 | A kind of electrical machine energy-saving control system and power-economizing method |
| CN108614151A (en) * | 2018-03-30 | 2018-10-02 | 北京理工大学 | A kind of measurement method of vehicle motor controller efficiency, apparatus and system |
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