CN115549557B - Quick frequency elimination algorithm for motor interference-free control device - Google Patents
Quick frequency elimination algorithm for motor interference-free control device Download PDFInfo
- Publication number
- CN115549557B CN115549557B CN202211277154.6A CN202211277154A CN115549557B CN 115549557 B CN115549557 B CN 115549557B CN 202211277154 A CN202211277154 A CN 202211277154A CN 115549557 B CN115549557 B CN 115549557B
- Authority
- CN
- China
- Prior art keywords
- voltage
- interference
- power
- current
- contactor
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
Classifications
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02P—CONTROL OR REGULATION OF ELECTRIC MOTORS, ELECTRIC GENERATORS OR DYNAMO-ELECTRIC CONVERTERS; CONTROLLING TRANSFORMERS, REACTORS OR CHOKE COILS
- H02P29/00—Arrangements for regulating or controlling electric motors, appropriate for both AC and DC motors
- H02P29/02—Providing protection against overload without automatic interruption of supply
- H02P29/024—Detecting a fault condition, e.g. short circuit, locked rotor, open circuit or loss of load
- H02P29/026—Detecting a fault condition, e.g. short circuit, locked rotor, open circuit or loss of load the fault being a power fluctuation
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02P—CONTROL OR REGULATION OF ELECTRIC MOTORS, ELECTRIC GENERATORS OR DYNAMO-ELECTRIC CONVERTERS; CONTROLLING TRANSFORMERS, REACTORS OR CHOKE COILS
- H02P29/00—Arrangements for regulating or controlling electric motors, appropriate for both AC and DC motors
- H02P29/02—Providing protection against overload without automatic interruption of supply
- H02P29/024—Detecting a fault condition, e.g. short circuit, locked rotor, open circuit or loss of load
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02P—CONTROL OR REGULATION OF ELECTRIC MOTORS, ELECTRIC GENERATORS OR DYNAMO-ELECTRIC CONVERTERS; CONTROLLING TRANSFORMERS, REACTORS OR CHOKE COILS
- H02P29/00—Arrangements for regulating or controlling electric motors, appropriate for both AC and DC motors
- H02P29/02—Providing protection against overload without automatic interruption of supply
- H02P29/024—Detecting a fault condition, e.g. short circuit, locked rotor, open circuit or loss of load
- H02P29/028—Detecting a fault condition, e.g. short circuit, locked rotor, open circuit or loss of load the motor continuing operation despite the fault condition, e.g. eliminating, compensating for or remedying the fault
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02P—CONTROL OR REGULATION OF ELECTRIC MOTORS, ELECTRIC GENERATORS OR DYNAMO-ELECTRIC CONVERTERS; CONTROLLING TRANSFORMERS, REACTORS OR CHOKE COILS
- H02P29/00—Arrangements for regulating or controlling electric motors, appropriate for both AC and DC motors
- H02P29/02—Providing protection against overload without automatic interruption of supply
- H02P29/032—Preventing damage to the motor, e.g. setting individual current limits for different drive conditions
Landscapes
- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Control Of Ac Motors In General (AREA)
Abstract
The invention discloses a motor interference electricity non-disturbance control device frequency elimination rapid algorithm, a system voltage and an alternating current contactor control coil state are utilized to rapidly judge an interference electricity process; b. the system voltage is converted into rated 2mA weak current signals through RJ1 and RJ2 resistors; c. the suction state of the alternating current contactor is obtained by collecting whether the coil voltage of the alternating current contactor exists or not; d. because of the small capacity, the low-voltage power supply loop can fluctuate widely in voltage and frequency when load fluctuation occurs, particularly in a power-shaking state, and the control loop switching is completed before the motor control contactor coil is released. The non-disturbance work control of the low-voltage motor during voltage power oscillation or short-time fluctuation is effectively ensured, and the continuity and stability of the industrial enterprise production process are greatly improved.
Description
Technical Field
The invention belongs to the technical field of motor control devices, and particularly relates to a frequency elimination fast algorithm of a motor interference electricity non-disturbance control device.
Background
Short-time voltage drop and fluctuation (commonly called 'power-shaking') occur in the power supply network of the industrial enterprise due to lightning strike, short circuit, reclosing, starting or fault removal of the same section of equipment, etc., and the duration of the 'power-shaking' is generally from tens of milliseconds to hundreds of milliseconds, which is unavoidable and unpredictable. The motor is an important mechanical dragging element for industrial enterprises, the alternating current contactor is adopted for control, the alternating current contactor is released to cause the motor to stop operating, and particularly, the stop of the important motor can cause the stop of electrical equipment and the interlocking action of production process in the production process, so that the production process is forced to stop operating. The electric interference seriously affects the safety and stability of industrial enterprises and long-period operation, and can cause equipment damage, environmental pollution, even casualties and other secondary accidents, thereby causing great economic loss for production enterprises. The 'electric interference' has become a serious headache problem which has to be faced in the production process of industrial enterprises, and a rapid and undisturbed control device for the piezoelectric motor is designed for the problem.
Disclosure of Invention
Aiming at the defects of the prior art, the invention aims to provide a rapid frequency elimination algorithm of a motor interference electricity non-disturbance control device, which effectively ensures the non-disturbance work control of a motor when voltage interference electricity or short-time fluctuation occurs, and greatly improves the continuity and stability of the production process of industrial enterprises.
The invention provides the following technical scheme:
a rapid frequency elimination algorithm of a motor interference current non-disturbance control device,
a. the system voltage and the state of an alternating current contactor control coil are utilized to rapidly judge the electric interference process, the system voltage is larger than a fixed value of a recovery voltage, the voltage is considered to be normal when the alternating current contactor is in a suction state, the voltage is expanded for 1S in normal time, the system voltage is smaller than an electric interference starting fixed value in normal voltage expansion time, an electric interference logic is started, K1 and K2 relays are driven, an alternating current contactor coil control power supply is rapidly switched from an alternating current power supply (L/N) to a direct current power supply (DC 30V), the alternating current contactor is ensured to keep not losing electricity in the electric interference process, the load is still driven by the low-voltage motor due to inertia when the electric interference occurs, and the stability of the control loop ensures the undisturbed continuous operation of a low-voltage motor driving loop;
b. the system voltage (L/N) is converted into a rated 2mA weak current signal through RJ1 and RJ2 resistors, PT is a 2mA/2mA converter, meanwhile, the signal isolation function is achieved, RA0 is a sampling resistor to convert the current signal into a voltage signal, an operational amplifier U8 and resistors RA 1-RA 4 form a voltage operation circuit, resistors RA 5-RA 6 and capacitors CA 1-CA 2 form a low-pass anti-aliasing filter circuit, the system voltage is converted into a undistorted 0-3.3V weak current signal after a series of circuit conversion, isolation, operation and filtering processes, the weak current signal is input into a 12-bit AD converter of a main control chip, and the main control chip adopts 1600Hz sampling frequency to acquire system voltage sampling data;
c. acquiring the presence or absence of the coil voltage of an alternating-current contactor to obtain the attraction state of the alternating-current contactor, wherein RD 4-RD 5 are voltage dividing resistors, ZL is a single-phase full-wave rectifier, E3 is an energy storage capacitor, the alternating-current voltage of the contactor is converted into direct-current voltage not exceeding 36V, the resistors RD 1-RD 3, the capacitor CD1, the 10V voltage stabilizing tube ZD1, the diode DD1 and the optocoupler UD1 form a switching value acquisition circuit, and the presence or absence of the attraction voltage of the alternating-current contactor is judged according to the level of a DI1 switching value signal;
d. because of the small capacity, the low-voltage power supply loop can fluctuate widely in voltage and frequency when load fluctuation occurs, particularly in a power-shaking state, and control loop switching is completed before a motor control contactor coil is released (within 15 m).
Preferably, the interference electricity logic processing is performed by using a frequency elimination three-point fast algorithm with a differential filter, and the whole data window is provided with five sampling points.
Preferably, the frequency elimination three-point fast algorithm with the differential filter is as follows:
1) Second order differential filter: u (u) k ＝v k -v k-2
Wherein v is k 、v k-2 For the current point and the voltage sampling value before two points, u k Differential sampling value for the current point;
2) Three-point algorithm amplitude calculation formula:
wherein u is k 、u k-1 、u k-2 And respectively sampling data of the current point, the previous point and the previous two points after difference.
3) The frequency elimination three-point algorithm calculates an amplitude formula:
wherein u is k 、u k-1 、u k-2 Respectively sampling data of a current point, a previous point and a previous two points after difference;
4) Electric interference logic processing technique
Voltage normal logic: u (U) 2 ≥U 2 2 And the AC contactor is at the closing position>The voltage is normally expanded for 1S time;
and (3) power-on-interference logic: u (U) 2 ≤U 1 2 And within the normal voltage extension time;
wherein U is a voltage real-time calculated value, U 2 For voltage recovery, U 1 And (5) starting a fixed value for the power-on interference.
A system adopted by a motor interference electricity non-disturbance control device frequency elimination rapid algorithm is characterized in that a switching inversion power supply is adopted to output two paths of direct current power supplies of 5V (VCC) and 30V, a main control chip U1 adopts an ARM processor, a 12-bit high-speed AD converter built in the chip is utilized to collect system voltage, URAT DMA communication ports built in the chip are utilized to realize external communication interconnection, U2 is a power reference chip, 3.3V is output to provide digital power for a main control loop, U7 is the power reference chip, 3.3VA is output to provide analog power for an analog sampling loop, VRR is analog sampling reference voltage, U5 and U6 are logic NOT gates, the IO port driving capability of the main control chip is enhanced to drive a four-joint common anode nixie tube for device parameter and information display, U4 is a ferroelectric memory and is mainly used for storing device event information, and power failure is avoided.
Preferably, the main control chip U1 adopts a 32-bit ARM processor STM32F103C8T6, U2 is a power reference chip LM1117-3.3V, U7 is a power reference chip SPX5205-3.3V, and U4 is a ferroelectric memory FM240L04.
Preferably, information is exchanged with the outside through one path of RS485 communication port, UC1 and UC2 are high-speed optocouplers, UC3 is a common optocoupler and used for controlling the receiving and sending of a communication chip, three optocouplers of UC 1-UC 3 realize the isolation of a main control system and an external communication interface, UC4 is a chip with high anti-interference and high driving capability, TV 1-TV 3 are fast transient tubes, RT 1-RT 2 are PTC resistors and are mainly used for protecting and isolating a communication loop.
Preferably, UC1 and UC2 are high-speed optocouplers HCPL0601, UC3 is a common optocoupler P181, UC4 is a 485 bus special chip, and RT 1-RT 2 are 120 ohm PTC resistors.
Preferably, the main control chip controls the K1 relay through the TR1A/TR1N, and controls the K2 relay through the TR2A/TR2N, wherein Q4, Q8, Q5 and Q9 are MOS driving tubes BS170; the K1 relay is in the attraction state when the logic level of TR1A/TR1N is 1/0, the K2 relay is in the attraction state when the logic level of TR2A/TR2N is 1/0, and two opposite signals are adopted to control one relay so as to ensure the reliability of driving; when the voltage is normal, the alternating current L/N supplies power to a contactor KM control coil through normally closed contacts of K1 and K2, and the KM coil control power supply realizes self-locking through a normally open contact of the KM coil control power supply; when the voltage is normal, the switching power supply outputs DC5V power to the weak current control system, meanwhile, DC30V direct current power is output to charge Faraday capacitors F1-F6 and electrolytic capacitors E1-E2, RC is the Faraday capacitor charging current limiting resistor, F1-F6 is 3.3F/5.5V Faraday capacitor, E1-E2 is 1000uF/50V electrolytic capacitor, DD 1-DD 2 is a Schottky diode to prevent reverse power transmission of a charging loop.
Preferably, the main control chip drives the K1 and K2 relays rapidly during power oscillation, the Farad capacitor and the electrolytic capacitor supply power to the KM coil of the contactor, the purpose of increasing the electrolytic capacitor is mainly to enhance the driving capability of a direct current loop at the switching moment, the main control chip drives the relays K1 and K2 at 3ms when the power oscillation occurs, the reliable suction time of the relays is not more than 7ms, and the whole power supply switching time is not more than 10ms; the power-losing release time of the alternating-current contactor is not less than 15ms, the power supply switching time is far less than the release time of the alternating-current contactor by 15ms, reliable switching of the electric power source is guaranteed, the Faraday capacitor and the electrolytic capacitor can keep the alternating-current contactor not to release in 15S-25S time when the electric power-shaking occurs, the electric power-shaking time of a low-voltage power network is generally tens of milliseconds to hundreds of milliseconds, and therefore the normal and reliable work of the low-voltage motor in an electric-shaking state without disturbance is guaranteed.
Compared with the prior art, the invention has the following beneficial effects:
(1) The invention relates to a motor interference electricity non-disturbance control device frequency elimination rapid algorithm, which utilizes a frequency elimination three-point rapid algorithm with a differential filter to rapidly and accurately measure voltage amplitude values, carries out 'interference electricity' logic processing, and has the advantages that when the sampling frequency is 1600Hz, the whole data window is 5 sampling points, the processing time is about 3ms, the measurement error is not more than 1%, and the frequency fluctuation in a large range hardly affects the measurement accuracy of the frequency elimination algorithm.
(2) The invention relates to a motor interference electricity non-disturbance control device frequency elimination rapid algorithm, which comprises a hardware control loop and a power supply switching loop special for the non-disturbance control device, wherein the repeated test shows that the coil of the motor interference electricity non-disturbance control device is kept at low power consumption at the moment of the power failure of an alternating current contactor, DC30V can keep the alternating current coil not to lose electricity, the device adopts DC30V as an alternating current contactor interference electricity control power supply, the alternating current contactor control power supply is rapidly (not more than 10 ms) switched to the DC30V control power supply when the interference electricity occurs, the non-power loss of the alternating current contactor within 15S-25S time is ensured, the motor is still driven to load due to inertia when the interference electricity occurs, and the stability of the control loop ensures the non-disturbance continuous operation of a low-voltage motor driving loop.
(3) The motor interference electricity non-disturbance control device frequency elimination rapid algorithm integrates the functions of interference electricity rapid maintenance, interference electricity self-starting, incoming call self-starting, interlocking control, voltage measurement, frequency measurement, interference electricity fault wave recording, network communication and the like, has powerful functions, and can be flexibly selected by various functional users.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings that are needed in the embodiments will be briefly described below, it being understood that the following drawings only illustrate some examples of the present invention and therefore should not be considered as limiting the scope, and other related drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.
Fig. 1 is a schematic diagram of a master control system of the electric interference non-disturbance control device.
Fig. 2 is a schematic diagram of a high-speed isolation anti-interference communication circuit design of the interference-free control device.
Fig. 3 is a schematic diagram of the ac contactor control power supply switching of the present interference current non-disturbance control device.
Fig. 4 is a schematic diagram of a voltage analog quantity switching value acquisition circuit of the interference electricity non-disturbance control device.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present invention more apparent, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention. It will be apparent that the described embodiments are some, but not all, of the embodiments of the invention. All other embodiments, based on the embodiments of the invention, which are apparent to those of ordinary skill in the art without inventive faculty, are intended to be within the scope of the invention.
Thus, the following detailed description of the embodiments of the invention, as presented in the figures, is not intended to limit the scope of the invention, as claimed, but is merely representative of selected embodiments of the invention. All other embodiments, based on the embodiments of the invention, which are apparent to those of ordinary skill in the art without inventive faculty, are intended to be within the scope of the invention.
Embodiment one:
a rapid frequency elimination algorithm of a motor interference current non-disturbance control device,
a. the system voltage and the state of an alternating current contactor control coil are utilized to rapidly judge the electric interference process, the system voltage is larger than a fixed value of a recovery voltage, the voltage is considered to be normal when the alternating current contactor is in a suction state, the voltage is expanded for 1S in normal time, the system voltage is smaller than an electric interference starting fixed value in normal voltage expansion time, an electric interference logic is started, K1 and K2 relays are driven, an alternating current contactor coil control power supply is rapidly switched from an alternating current power supply (L/N) to a direct current power supply (DC 30V), the alternating current contactor is ensured to keep not losing electricity in the electric interference process, the load is still driven by the low-voltage motor due to inertia when the electric interference occurs, and the stability of the control loop ensures the undisturbed continuous operation of a low-voltage motor driving loop;
b. the system voltage (L/N) is converted into a rated 2mA weak current signal through RJ1 and RJ2 resistors, PT is a 2mA/2mA converter, meanwhile, the signal isolation function is achieved, RA0 is a sampling resistor to convert the current signal into a voltage signal, an operational amplifier U8 and resistors RA 1-RA 4 form a voltage operation circuit, resistors RA 5-RA 6 and capacitors CA 1-CA 2 form a low-pass anti-aliasing filter circuit, the system voltage is converted into a undistorted 0-3.3V weak current signal after a series of circuit conversion, isolation, operation and filtering processes, the weak current signal is input into a 12-bit AD converter of a main control chip, and the main control chip adopts 1600Hz sampling frequency to acquire system voltage sampling data;
c. acquiring the presence or absence of the coil voltage of an alternating-current contactor to obtain the attraction state of the alternating-current contactor, wherein RD 4-RD 5 are voltage dividing resistors, ZL is a single-phase full-wave rectifier, E3 is an energy storage capacitor, the alternating-current voltage of the contactor is converted into direct-current voltage not exceeding 36V, the resistors RD 1-RD 3, the capacitor CD1, the 10V voltage stabilizing tube ZD1, the diode DD1 and the optocoupler UD1 form a switching value acquisition circuit, and the presence or absence of the attraction voltage of the alternating-current contactor is judged according to the level of a DI1 switching value signal;
d. because of the small capacity, the low-voltage power supply loop can fluctuate widely in voltage and frequency when load fluctuation occurs, particularly in a power-shaking state, and control loop switching is completed before a motor control contactor coil is released (within 15 m).
And (3) carrying out interference electricity logic processing by using a frequency elimination three-point fast algorithm with a differential filter, wherein the whole data window is provided with five sampling points.
The frequency elimination three-point rapid algorithm with the differential filter is as follows:
1) Second order differential filter: u (u) k ＝v k -v k-2
Wherein v is k 、v k-2 For the current point and the voltage sampling value before two points, u k Is at presentA point differential sampling value;
2) Three-point algorithm amplitude calculation formula:
wherein u is k 、u k-1 、u k-2 And respectively sampling data of the current point, the previous point and the previous two points after difference.
3) The frequency elimination three-point algorithm calculates an amplitude formula:
wherein u is k 、u k-1 、u k-2 Respectively sampling data of a current point, a previous point and a previous two points after difference;
4) Electric interference logic processing technique
Voltage normal logic: u (U) 2 ≥U 2 2 And the AC contactor is at the closing position>The voltage is normally expanded for 1S time;
and (3) power-on-interference logic: u (U) 2 ≤U 1 2 And within the normal voltage extension time;
wherein U is a voltage real-time calculated value, U 2 For voltage recovery, U 1 And (5) starting a fixed value for the power-on interference.
The main control chip controls the K1 relay through the TR1A/TR1N, controls the K2 relay through the TR2A/TR2N, and the Q4, the Q8, the Q5 and the Q9 are MOS driving tubes BS170; the K1 relay is in the attraction state when the logic level of TR1A/TR1N is 1/0, the K2 relay is in the attraction state when the logic level of TR2A/TR2N is 1/0, and two opposite signals are adopted to control one relay so as to ensure the reliability of driving; when the voltage is normal, the alternating current L/N supplies power to a contactor KM control coil through normally closed contacts of K1 and K2, and the KM coil control power supply realizes self-locking through a normally open contact of the KM coil control power supply; when the voltage is normal, the switching power supply outputs DC5V power to the weak current control system, meanwhile, DC30V direct current power is output to charge Faraday capacitors F1-F6 and electrolytic capacitors E1-E2, RC is the Faraday capacitor charging current limiting resistor, F1-F6 is 3.3F/5.5V Faraday capacitor, E1-E2 is 1000uF/50V electrolytic capacitor, DD 1-DD 2 is a Schottky diode to prevent reverse power transmission of a charging loop.
The main control chip drives the relays K1 and K2 rapidly when the power is in interference, the Faraday capacitor and the electrolytic capacitor supply power to the contactor KM coil together, the purpose of increasing the electrolytic capacitor is mainly to enhance the direct-current loop driving capability at the switching moment, the main control chip drives the relays K1 and K2 at 3ms when the power is in interference, the reliable absorption time of the relays is not more than 7ms, and the whole power supply switching time is not more than 10ms; the power-losing release time of the alternating-current contactor is not less than 15ms, the power supply switching time is far less than the release time of the alternating-current contactor by 15ms, reliable switching of the electric power source is guaranteed, the Faraday capacitor and the electrolytic capacitor can keep the alternating-current contactor not to release in 15S-25S time when the electric power-shaking occurs, the electric power-shaking time of a low-voltage power network is generally tens of milliseconds to hundreds of milliseconds, and therefore the normal and reliable work of the low-voltage motor in an electric-shaking state without disturbance is guaranteed.
Example two
A system adopted by a motor interference electricity non-disturbance control device frequency elimination rapid algorithm is characterized in that a switching inversion power supply is adopted to output two paths of direct current power supplies of 5V (VCC) and 30V, a main control chip U1 adopts an ARM processor, a 12-bit high-speed AD converter built in the chip is utilized to collect system voltage, URAT DMA communication ports built in the chip are utilized to realize external communication interconnection, U2 is a power reference chip, 3.3V is output to provide digital power for a main control loop, U7 is the power reference chip, 3.3VA is output to provide analog power for an analog sampling loop, VRR is analog sampling reference voltage, U5 and U6 are logic NOT gates, the IO port driving capability of the main control chip is enhanced to drive a four-joint common anode nixie tube for device parameter and information display, U4 is a ferroelectric memory and is mainly used for storing device event information, and power failure is avoided.
The main control chip U1 adopts a 32-bit ARM processor STM32F103C8T6, U2 is a power reference chip LM1117-3.3V, U7 is a power reference chip SPX5205-3.3V, and U4 is a ferroelectric memory FM240L04.
Through the exchange information of one path RS485 communication port and the outside, UC1, UC2 are high-speed optocouplers, UC3 is a common optocoupler for control communication chip's receipt and transmission, UC1 ~ UC3 three optocouplers realize the isolation of main control system and external communication interface, UC4 is for having high interference resistance, high driving capability chip, TV1 ~ TV3 are quick transient tube, RT1 ~ RT2 are PTC resistance, mainly used as the protection and the wall of communication return circuit.
UC1 and UC2 are high-speed optocouplers HCPL0601, UC3 is a common optocoupler P181, UC4 is a 485 bus special chip, and RT 1-RT 2 are 120 ohm PTC resistors.
Example III
The main control system of the interference electricity non-disturbance control device comprises: the principle diagram of the master control system of the interference electricity non-disturbance control device is shown in the accompanying figure 1: the device adopts a switching inverter power supply with the power of 8W to output two paths of direct current power supplies of 5V (VCC) and 30V. The main control chip U1 adopts a 32-bit ARM processor STM32F103C8T6, utilizes a 12-bit high-speed AD converter built in the chip to collect system voltage, and utilizes a URAT DMA communication port built in the chip to realize external communication interconnection. U2 is a power reference chip LM1117-3.3V, and 3.3V with the output precision of 1% provides a digital power supply for the main control loop. U7 is a power reference chip SPX5205-3.3V, 3.3VA with the output precision of 1% provides an analog power supply for an analog sampling loop, and VRR is an analog sampling reference voltage. U5 and U6 are logic NOT gates 74HC04, and the drive capability of the IO port of the main control chip is enhanced to drive the four-joint common-anode nixie tube for displaying device parameters and information. U4 is ferroelectric memory FM240L04, and is mainly used for storing device event information, and power failure is not lost.
The interference electricity non-disturbance control device exchanges information with the outside through one path of RS485 communication port, and the communication principle is shown in figure 2.
UC1 and UC2 are high-speed optocouplers HCPL0601, the communication speed can reach 10M, UC3 is a common optocoupler P181 and is used for controlling the receiving and sending of a communication chip, and three optocouplers UC 1-UC 3 realize the isolation between a main control system and an external communication interface and enhance the reliability of the system. UC4 is 485 bus special chip 6LBC184 with high anti-interference and high driving capability, and 128 communication terminals can be connected on the bus. TV 1-TV 3 are fast transient tubes, RT 1-RT 2 are 120 ohm PTC resistors, and are mainly used for protecting and isolating communication loops. The communication loop has the characteristics of high communication speed, high communication reliability, strong driving capability and the like.
2. The method for controlling the power supply switching by the alternating current contactor of the interference electricity non-disturbance control device comprises the following steps:
the alternating current contactor coil is kept with low power consumption at the instant of power failure, and the repeated test shows that the DC30V can keep the alternating current coil without power failure, and the device adopts the DC30V as an electric control power source for the alternating current contactor.
The switching principle of the alternating-current contactor control power supply of the device is shown in the figure 3, a main control chip controls a K1 relay through a TR1A/TR1N, and controls a K2 relay through a TR2A/TR2N, and Q4, Q8, Q5 and Q9 are MOS driving tubes BS170. The K1 relay is in the attraction state when the logic level of TR1A/TR1N is 1/0, the K2 relay is in the attraction state when the logic level of TR2A/TR2N is 1/0, and two opposite signals are adopted to control one relay so as to ensure the reliability of driving. When the voltage is normal, the alternating current L/N supplies power to the KM control coil of the contactor through the normally closed contacts of K1 and K2, and the KM coil control power supply realizes self-locking through the normally open contacts. When the voltage is normal, the switching power supply outputs a DC5V power supply to the weak current control system, and simultaneously outputs a DC30V direct current power supply to charge the Faraday capacitors F1-F6 and the electrolytic capacitors E1-E2. RC is a Faraday capacitor charging current-limiting resistor, F1-F6 are 3.3F/5.5V Faraday capacitors, E1-E2 are 1000uF/50V electrolytic capacitors, and DD 1-DD 2 are Schottky diodes to prevent reverse power transmission of a charging loop.
When 'power-on interference', the main control chip drives the K1 and K2 relays rapidly, the Faraday capacitor and the electrolytic capacitor supply power to the KM coil of the contactor together, and the purpose of increasing the electrolytic capacitor is mainly to enhance the driving capability of the direct current loop at the switching moment. When the power-on interference occurs, the main control chip drives the relays K1 and K2 in 3ms, the reliable suction time of the relays is not more than 7ms, and the whole power supply switching time is not more than 10ms; the power-off release time of the alternating-current contactor is not less than 15ms. The power supply switching time is far less than the release time of the alternating current contactor by 15ms, so that reliable switching of the power supply with interference electricity is ensured. The Faraday capacitor and the electrolytic capacitor can keep the alternating current contactor 15S-25S not released when the power oscillation occurs, and the power oscillation time of the low-voltage power grid is generally tens of milliseconds to hundreds of milliseconds, so that the normal and reliable work of the low-voltage motor in the power oscillation state without disturbance is ensured.
3. The rapid calculation and logic judgment method of the interference electricity non-disturbance control device comprises the following steps:
the device utilizes the system voltage and the state of the control coil of the alternating current contactor to rapidly judge the interference electricity process: when the system voltage is larger than the recovery voltage fixed value and the AC contactor is in the suction state, the voltage is considered to be normal, and the normal time of the voltage is expanded by 1S. And in the normal voltage expansion time, the system voltage is smaller than the electric-shaking starting fixed value, an electric-shaking logic is started, the K1 relay and the K2 relay are driven, the coil control power supply of the alternating-current contactor is rapidly switched from an alternating-current power supply (L/N) to a direct-current power supply (DC 30V), and the alternating-current contactor is ensured to keep not losing electricity in the electric-shaking process. When 'power-off' happens, the low-voltage motor still drives a load due to inertia, and the stability of the control loop ensures the undisturbed continuous operation of the low-voltage motor driving loop, so that the method has very important significance for continuous and stable production of industrial enterprises.
The system voltage (L/N) and the state collection schematic diagram of the alternating current contactor are shown in figure 2, the system voltage (L/N) is converted into rated 2mA weak current signals through RJ1 and RJ2 resistors, PT is a 2mA/2mA converter, and meanwhile, the signal isolation function is achieved. RA0 is a sampling resistor which changes a current signal into a voltage signal, the operational amplifier U8 and resistors RA 1-RA 4 form a voltage operation circuit, and the resistors RA 5-RA 6 and the capacitors CA 1-CA 2 form a low-pass anti-aliasing filter circuit. The system voltage is converted into a low-current signal with undistorted 0-3.3V after a series of circuit conversion, isolation, operation and filtering treatment, the low-current signal is input into a 12-bit AD converter of a main control chip, and the main control chip adopts 1600Hz sampling frequency to acquire system voltage sampling data.
The ac contactor pull-in state is obtained by collecting the presence or absence of ac contactor coil voltage, RD4 to RD5 are voltage dividing resistors, ZL is a single-phase full-wave rectifier, E3 is an energy storage capacitor, and they together convert the contactor ac voltage into a dc voltage of not more than 36V. The resistors RD 1-RD 3, the capacitors CD1, the 10V voltage stabilizing tube ZD1, the diode DD1 and the optocoupler UD1 form a switching value acquisition circuit, and whether the pull-in voltage of the alternating current contactor exists or not can be known through the switching value of the DI 1. The low-voltage power supply circuit has limited capacity, so that the voltage and the frequency can fluctuate widely when load fluctuation occurs, particularly in a 'power-on-interference' state. Before the motor control contactor coil is released (within 15 m), control loop switching must be completed, in order to meet the requirements of rapid calculation and rapid logic processing, the device is originally designed to a frequency elimination three-point rapid algorithm with a differential filter, voltage amplitude can be rapidly and accurately measured by utilizing three sampling points after differential filtering, and 'power-on-interference' logic processing is performed. The whole data window is five sampling points, when the sampling frequency is 1600Hz, the algorithm time is 3ms, the calculated measurement error is not more than 1%, and the perfect unification of the rapidity and the accuracy of the voltage measurement is realized.
The following is a frequency elimination three-point fast algorithm calculation formula with a differential filter adopted by the device and an explanation thereof.
1) Second order differential filter: u (u) k ＝v k -v k-2
Wherein v is k 、v k-2 For the current point and the voltage sampling value before two points, u k The aim of the difference is to filter the influence of the direct current component and the transient component on the algorithm.
2) The amplitude calculation formula of the traditional three-point algorithm comprises the following steps:
wherein u is k 、u k-1 、u k-2 And respectively sampling data of the current point, the previous point and the previous two points after difference. When the system frequency is fixed, for sine wave voltage, the three-point sampling algorithm has no error in theory, and the error introduced by the AD sampling precision and the calculation precision is very small. However, the low-voltage power supply circuit has limited capacity, and thus, when load fluctuation occurs, particularly in a "power-on-grid" state, the voltage frequency may fluctuate widely. The traditional three-point algorithm comprises a frequency characteristic parameter omega, so that a large calculation error is caused when the frequency fluctuates in a large range, and the traditional three-point algorithm is not suitable for being used for calculating and processing low-voltage 'power-on-interference' state data.
3) The frequency elimination three-point algorithm calculates an amplitude formula:
wherein u is k 、u k-1 、u k-2 And respectively sampling data of the current point, the previous point and the previous two points after difference.
The device creatively designs a frequency elimination three-point rapid algorithm, and eliminates the influence of frequency characteristic parameters omega on calculation and measurement. When the frequency fluctuates in a large range, the voltage measurement precision is hardly affected, the calculation error is not more than 1%, and a perfect result is obtained. Compared with the traditional three-point fast algorithm, the method has the defect that more multiplication and division operations are needed, even 64-bit multiplication and division operations are needed, but for a 32-bit ARM processor STM32F103C8T6, more calculation tasks are not particularly interesting.
4) Electric interference logic processing
Voltage normal logic: u (U) 2 ≥U 2 2 And the AC contactor is at the closing position>The voltage is normally expanded for 1S time;
and (3) power-on-interference logic: u (U) 2 ≤U 1 2 And within the normal voltage extension time;
wherein U is a voltage real-time calculated value, U 2 For voltage recovery, U 1 And (5) starting a fixed value for the power-on interference. The square value comparison is used for replacing the effective value comparison, so that the calculated amount is greatly reduced.
The device obtained through the technical scheme is a rapid frequency elimination algorithm of the motor interference electricity non-disturbance control device, and the product integrates the functions of rapid maintenance of interference electricity, self-starting of incoming call, interlocking control, voltage measurement, frequency measurement, interference electricity fault wave recording, network communication and the like, can be widely applied to low-voltage motor application occasions, effectively ensures the non-disturbance work control of the motor during voltage interference electricity or short-time fluctuation, and greatly improves the continuity and stability of the production process of industrial enterprises.
When the power supply system is in power oscillation, the voltage fluctuation is frequent, the frequency is jumped in a large range, and in order to meet the requirements of rapid calculation and rapid logic processing, a frequency elimination three-point rapid algorithm with a differential filter is designed to rapidly and accurately measure the voltage amplitude, and the power oscillation logic processing is carried out. When the sampling frequency is 1600Hz, the whole data window is 5 sampling points, the processing time is about 3ms, the measurement error is not more than 1%, and the frequency fluctuation in a large range hardly affects the measurement accuracy of the frequency elimination algorithm.
A hardware control loop and a power supply switching loop special for a disturbance-free control device are designed. Through repeated experiments, the conclusion is that the coil of the alternating current contactor is kept at low power consumption at the moment of power failure of the alternating current contactor, and the alternating current coil can be kept at the constant power failure of DC 30V. The device adopts DC30V as an AC contactor electric-shaking control power supply, and when electric-shaking occurs, the AC contactor control power supply is switched to the DC30V control power supply rapidly (not more than 10 ms), so that the electric-shaking does not occur within the time of 15S-25S of the AC contactor. When the electric motor is in the electric shaking state, the load is still driven by inertia, the stability of the control loop ensures the undisturbed continuous operation of the driving loop of the electric motor, and the electric motor has very important significance for continuous and stable production of industrial enterprises.
In order to meet the requirements of users on multiple functions of the undisturbed control device, the design product integrates the functions of quick holding of the interference electricity, automatic starting of the incoming call, interlocking control, voltage measurement, frequency measurement, interference electricity fault wave recording, network communication and the like, has powerful functions, and various functional users can flexibly select whether to use or not.
The above description is only of the preferred embodiments of the present invention and is not intended to limit the present invention, and various modifications and variations of the present invention will be apparent to those skilled in the art; any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (5)
1. A rapid frequency elimination algorithm for a motor interference electricity non-disturbance control device is characterized in that,
a. the system voltage and the coil state of the alternating current contactor are utilized to rapidly judge the electric interference process, the system voltage is larger than a voltage recovery fixed value, the voltage is considered to be normal when the alternating current contactor is in a suction state, the voltage is normally expanded for 1S, the system voltage is smaller than an electric interference starting fixed value in the normal voltage expansion time, an electric interference logic is started, a K1 relay and a K2 relay are driven, the coil control power of the alternating current contactor is rapidly switched from an alternating current power supply to a direct current power supply, the alternating current contactor is ensured to keep not losing electricity in the electric interference process, the load is still driven by the alternating current motor due to inertia when the alternating current contactor is in the electric interference process, and the stability of a control loop ensures the undisturbed continuous operation of a low-voltage motor driving loop;
b. the system voltage is converted into a weak current signal through RJ1 and RJ2 resistors, the weak current signal is output to an RA0 sampling resistor through a PT converter, the PT converter is a 2mA/2mA converter, meanwhile, the PT converter plays a signal isolation role, the RA0 sampling resistor changes the current signal into a voltage signal, an operational amplifier U8 and resistors RA1, RA2, RA3 and RA4 form a voltage operation circuit, resistors RA5, RA6 and capacitors CA1 and CA2 form a low-pass anti-aliasing filter circuit, the system voltage is changed into an undistorted 0-3.3V weak current signal after being processed by the circuit conversion, the signal isolation, the voltage operation circuit and the low-pass anti-aliasing filter circuit in sequence, the weak current signal is input into a 12-bit AD converter of a main control chip, and the main control chip adopts 1600Hz sampling frequency to acquire system voltage sampling data;
c. the method comprises the steps that the attraction state of an alternating-current contactor is obtained by collecting the existence of the coil voltage of the alternating-current contactor, RD4 and RD5 are voltage dividing resistors, ZL is a single-phase full-wave rectifier, two input ends of the single-phase full-wave rectifier are respectively connected with the voltage dividing resistors RD4 and RD5, an output end of the single-phase full-wave rectifier is connected with an energy storage capacitor E3, the alternating-current voltage of the contactor is converted into direct-current voltage which does not exceed 36V, the resistors RD1, RD2 and RD3, the capacitor CD1, the 10V voltage stabilizing tube ZD1, the diode DD1 and the optocoupler UD1 form a switching value collecting circuit, and the existence of the coil voltage of the alternating-current contactor is judged by the switching value signal of the output end DI1 of the optocoupler;
d. when the low-voltage power supply loop is in a power-shaking state, the voltage and the frequency can fluctuate in a large range, and the switching of the control loop is completed before the coil of the alternating-current contactor is released;
carrying out interference electricity logic processing by using a frequency elimination three-point fast algorithm with a differential filter, wherein the whole data window is provided with five sampling points; the frequency elimination three-point rapid algorithm with the differential filter is as follows:
1) Second order differential filter: u (U) k ＝V k -V k-2 The method comprises the steps of carrying out a first treatment on the surface of the Wherein V is k 、V k-2 For the current point and the voltage sampling value before two points, U k Sampling data for the current point after the difference;
2) The frequency elimination three-point algorithm calculates an amplitude formula:
wherein U is k 、U k-1 、U k-2 Respectively sampling data of a current point, a previous point and a previous two points after difference;
3) Electric interference logic processing
Voltage normal logic: u (U) m 2 ≥U 2 2 The method comprises the steps of carrying out a first treatment on the surface of the The alternating current contactor is at the closing position;
and (3) power-on-interference logic: u (U) m 2 ≤U 1 2 The method comprises the steps of carrying out a first treatment on the surface of the And within the normal voltage expansion time; wherein U is m For calculating the value of the system voltage in real time, U 2 For voltage recovery, U 1 And (5) starting a fixed value for the power-on interference.
2. The system for the rapid frequency elimination algorithm of the motor interference electricity non-disturbance control device according to claim 1, wherein a switching inversion power supply is adopted to output two paths of direct current power supplies of 5V and 30V, a main control chip U1 adopts an ARM processor, a 12-bit high-speed AD converter built in the chip is utilized to collect system voltage, a URAT DMA communication port built in the chip is utilized to realize external communication interconnection, U2 is a power reference chip, 3.3V is output to provide a digital power supply for a main control loop, U7 is a power reference chip, 3.3V is output to provide an analog power supply for an analog sampling loop, and U4 is a ferroelectric memory and used for storing event information of the device, and power failure is avoided.
3. The system for the rapid frequency cancellation algorithm of the motor interference-free disturbance-free control device according to claim 2, wherein the main control chip U1 adopts a 32-bit ARM processor STM32F103C8T6, U2 is a power reference chip LM1117-3.3V, U7 is a power reference chip SPX5205-3.3V, and U4 is a ferroelectric memory FM240L04.
4. The system for the rapid frequency elimination algorithm of the motor interference electricity non-disturbance control device according to claim 2, wherein information is exchanged with the outside through one path of RS485 communication port, UC1 and UC2 are high-speed optocouplers, UC3 is a common optocoupler, and three optocouplers of UC1, UC2 and UC3 realize isolation of a main control system and an external communication interface.
5. The system for the rapid frequency cancellation algorithm of the motor interference-free and disturbance-free control device according to claim 4, wherein UC1 and UC2 are high-speed optocouplers HCPL0601, UC3 is a common optocoupler P181.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202211277154.6A CN115549557B (en) | 2022-10-19 | 2022-10-19 | Quick frequency elimination algorithm for motor interference-free control device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202211277154.6A CN115549557B (en) | 2022-10-19 | 2022-10-19 | Quick frequency elimination algorithm for motor interference-free control device |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN115549557A CN115549557A (en) | 2022-12-30 |
| CN115549557B true CN115549557B (en) | 2023-07-18 |
Family
ID=84735233
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202211277154.6A Active CN115549557B (en) | 2022-10-19 | 2022-10-19 | Quick frequency elimination algorithm for motor interference-free control device |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN115549557B (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN117175774A (en) * | 2023-09-12 | 2023-12-05 | 深圳市亚特尔科技有限公司 | Anti-dazzling controller for alternating current control of motor |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101226855A (en) * | 2008-01-29 | 2008-07-23 | 江苏中金电器设备有限公司 | Anti-dazzling-electric exterior adjustable delay time type permanent magnetism type ac contactor |
| CN101309003A (en) * | 2008-06-27 | 2008-11-19 | 东南大学 | Synthetic apparatus of anti-flashover and protection for low-voltage three phase asynchronous motor |
| CN101393819A (en) * | 2008-10-28 | 2009-03-25 | 福州大学 | Anti-flashover intelligent AC contactor |
| CN113595037A (en) * | 2021-08-06 | 2021-11-02 | 云南电网有限责任公司红河供电局 | Comprehensive protection method and system for transformer substation |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2011254157A (en) * | 2010-05-31 | 2011-12-15 | Sony Corp | Information processing device, reception method and radio communication system |
-
2022
- 2022-10-19 CN CN202211277154.6A patent/CN115549557B/en active Active
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101226855A (en) * | 2008-01-29 | 2008-07-23 | 江苏中金电器设备有限公司 | Anti-dazzling-electric exterior adjustable delay time type permanent magnetism type ac contactor |
| CN101309003A (en) * | 2008-06-27 | 2008-11-19 | 东南大学 | Synthetic apparatus of anti-flashover and protection for low-voltage three phase asynchronous motor |
| CN101393819A (en) * | 2008-10-28 | 2009-03-25 | 福州大学 | Anti-flashover intelligent AC contactor |
| CN113595037A (en) * | 2021-08-06 | 2021-11-02 | 云南电网有限责任公司红河供电局 | Comprehensive protection method and system for transformer substation |
Non-Patent Citations (2)
| Title |
|---|
| 新型抗晃电的接触器智能控制器;苏晶晶等;低压电器(第23期);第12-17页 * |
| 智能型抗晃电失压控制模块的设计;罗文清等;水电能源科学;第35卷(第2期);第212-214页 * |
Also Published As
| Publication number | Publication date |
|---|---|
| CN115549557A (en) | 2022-12-30 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN100557910C (en) | Anti-rolling electricity of low-voltage three phase asynchronous motor and protection integration unit | |
| CN115549557B (en) | Quick frequency elimination algorithm for motor interference-free control device | |
| CN206313449U (en) | A kind of voltage sag compensation device for single-phase equipment | |
| CN103972976A (en) | Electric energy supply system | |
| CN201994717U (en) | Control device for supplying power to breaker control units | |
| CN102148529A (en) | Control device and control method thereof for intelligently supplying power to circuit breaker control unit | |
| CN101471556A (en) | Under-voltage protection circuit | |
| CN204118735U (en) | PV air-conditioner system and there is its PV air-conditioner | |
| CN203135386U (en) | Main contact adhesion detection device for AC contactor | |
| CN214011368U (en) | Double-fed converter direct current bus capacitance capacity detection device | |
| CN103779831B (en) | SCM Based three-phase self-resetting type over voltage protector | |
| CN209979769U (en) | Collection terminal is equipped with electric patch box | |
| CN203456874U (en) | Serial-connection type voltage compensation antagonistic apparatus | |
| CN204131095U (en) | The anti-shake electric installation of low voltage frequency converter | |
| CN116316664A (en) | Method and device for treating voltage sag of parallel active power filter based on super capacitor | |
| CN111403237A (en) | Alternating current contactor anti-interference electric control system | |
| CN219717935U (en) | Voltage sag protection device suitable for direct-current bus end of low-voltage frequency converter | |
| CN205160065U (en) | Instantaneous circuit protector against power failure of industrial computer hardware facility | |
| CN103944179A (en) | Power supply system for implementing communication system peak load shifting by utilizing lead-carbon batteries | |
| CN205123647U (en) | Frequency conversion switching control ware frequently of changing a job and device thereof | |
| CN110265970A (en) | Equipment power supply protection circuit and control method | |
| CN203813451U (en) | Lead-carbon battery-based peak load shifting type power supply system for communication system | |
| CN212811593U (en) | Full-automatic diesel generator intelligent control cabinet that connects in parallel | |
| CN207819546U (en) | Emergency power generation vehicle automatic switching device | |
| CN203733718U (en) | Wide voltage electromagnetic contactor control circuit with low voltage ride-through function |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant |