CN100590964C - Electricity-saving control method and device of frequency converter - Google Patents
Electricity-saving control method and device of frequency converter Download PDFInfo
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Abstract
The invention discloses a power saving control method for a frequency converter and the device, which optimizes the control of the speed regulating frequency converter of motor and realizes power saving. The method comprises the following steps: accepting the instruction of speed changing and frequency modulating; collecting information; extracting property parameter; comparing; analyzing runningcycle; realizing the process of frequency modulating. The invention has the advantages of enabling the system formed with the whole motor, the frequency conversion governor and the load under the best status and improving work efficiency of the system due to storing a large quantity of work data of the whole motor, the frequency conversion governor and the load and using fuzzy algorithm to optimize the work status of the system formed with the whole motor, the frequency conversion governor and the load, effectively solving the problem of unstable system, obviously improving work efficiency for the motor, obviously lowering heat production, saving power by 10 to 30%, obviously lowering harmonic quantity, lowering interruption upon power network and reaching more than 0.95 for power factordue to adopting smooth frequency variation curve.
Description
Technical field
The present invention relates to a kind of frequency converter power-saving control method and device, is a kind of regulate and control method and device to the electric machine speed regulation frequency converter, is the method and apparatus to the optimal control and the realization economize on electricity of electric machine speed regulation frequency converter.
Background technology
Adopting frequency control to carry out the power economize on electricity has been widely accepted and has been effective power-saving method, its reason is the power product of high-power frequency conversion speed regulator as a kind of maturation, its price is cheap to nearly all power supply unit acceptable degree, and the effect of its economize on electricity is fairly obvious.But traditional variable-frequency governor just simply is adjusted to rotating speed of motor the rotating speed of setting, does not promptly consider the relation between motor, load and the frequency converter three, does not also consider the influence of quick conversion process to whole power supply-using electricity system.In the actual moving process with regard to motor, its operating state is under different frequency conditions, running parameters such as its power output, efficient, moment of torsion, power factor all are different.Variable-frequency governor and load also have similar situation.For example blower fan and refrigeration machine are exactly two kinds of diverse load, and its running parameter also is not quite similar.Owing to do not consider relation between motor, load and the frequency converter three, and the three makes the operation of the such power supply-using electricity system of frequency control stable inadequately to the influence of electric power system, is easy to break down.Owing to do not consider that the relation between motor, load and the frequency converter three makes motor often be operated in the lower state of efficient, make controlled motor owing to inefficient operation is generated heat, cause the life-span of unnecessary waste and minimizing motor.Do not make the load of frequency converter and motor thereof often be operated in inefficient state owing to consider the relation between motor, load and the frequency converter three yet, irreconcilable work meeting makes the operation of variable-frequency governor and motor cause a large amount of harmonic waves between the three, and the change frequency of variable-frequency governor phase step type also can produce a large amount of harmonic waves simultaneously.These harmonic waves are very serious to the interference of power-supply system, and its harmonic content can reach 30%-70%, and so serious interference is very unfavorable to power supply grid.Because traditional variable-frequency governor is only considered the speed governing problem, does not consider the operating state of motor, the movement system of motor-load often lags behind, and causes the power factor of system lower, and power-efficient descends, and waste of energy is serious.
Summary of the invention
The present invention proposes a kind of frequency converter power-saving control method and device, described method and apparatus has detected and has stored the various running parameters of motor, variable-frequency governor and load to operating variable-frequency governor, in case need frequency control, then carry out the optimum Working that the three is found in computing, promptly the course of work is optimized, find the analytical system cycle of operation after the best operating point, formulate the frequency-modulating process plan.Make whole motor, variable-frequency governor and load at the uniform velocity all be in the best, the most effective operating state in running and the frequency modulation speed-change process.
The object of the present invention is achieved like this: a kind of frequency converter power-saving control method, employed hardware comprises: the power subsystem that comprises the feedway energy, the stable filter cell of maintenance power supply that is connected with power subsystem, the CPU of carrying out information processing and computing that is connected with filter cell, the memory cell of the stored information that is connected with CPU, two analog quantity input photoelectricity isolated locations that are connected with CPU, import two analog quantity input interfaces that the photoelectricity isolated locations are connected with two analog quantitys respectively, two analog quantity output photoelectricity isolated locations that are connected with CPU, export two analog output interface circuits that the photoelectricity isolated locations are connected with two analog quantitys respectively, two run signal output photoelectricity isolated locations that are connected with CPU, export four run signal output interfaces that the photoelectricity isolated locations are connected with two run signal respectively, the communication interface that is connected with CPU, the switch value input interface that is connected with CPU, the step of described method is as follows:
Accept speed change frequency modulation instruction step, this instruction can be by manually sending, and is perhaps sent by certain transducer of automated system;
The Information Monitoring step is by the working status parameter of information source collection motor, variable-frequency governor and load;
Extraction property parameter step, according to working status parameter that is obtained and the target frequency value that will reach, in database, extract the optkmal characteristics state parameter of corresponding motor, variable-frequency governor and load, described optkmal characteristics state parameter comprises the various parameters of motor, variable-frequency governor and load, these parameters all in handbook, technical standard or when dispatching from the factory producer in specification, indicate, and in advance in the storage memory cell;
Comparison step, more existing working status parameter and the target frequency value that will reach, and optkmal characteristics state parameter, optimize and choose each parameter, it is by the analysis to motor, variable-frequency governor and load to weight ratio curve that each parameter is chosen in described optimization, seek one with the immediate motor of target frequency, variable-frequency governor and the highest frequency values of load to weight ratio;
Analyze the step of the cycle of operation, the cycle of operation characteristic of the system that utilization motor, variable-frequency governor and load are formed is sought the hysteresis quality in the system that motor described in the transfer process of current frequency values and target frequency value, variable-frequency governor and load are formed;
Realize the step of frequency-modulating process, adjust frequency according to selected target frequency value.
A kind of frequency converter electricity-saving control device, comprise the power subsystem of supplying with the described device energy, the stable filter cell of maintenance power supply that is connected with power subsystem, the CPU of carrying out information processing and computing that is connected with filter cell, the memory cell of the stored information that is connected with CPU, two analog quantity input photoelectricity isolated locations that are connected with CPU, import two analog quantity input interfaces that the photoelectricity isolated locations are connected with two analog quantitys respectively, two analog quantity output photoelectricity isolated locations that are connected with CPU, export two analog output interface circuits that the photoelectricity isolated locations are connected with two analog quantitys respectively, two run signal output photoelectricity isolated locations that are connected with CPU, export four run signal output interfaces that the photoelectricity isolated locations are connected with two run signal respectively, the communication interface that is connected with CPU, the switch value input interface that is connected with CPU.
The beneficial effect that the present invention produces is: owing to stored the operational data of a large amount of motors, variable-frequency governor and load and used fuzzy algorithmic approach to optimize the operating state that the three forms system, the system works that whole motor, variable-frequency governor and load are formed has improved the operating efficiency of system in optimum state, effectively solved system's problem of unstable, motor working efficiency obviously improves, and caloric value obviously reduces.Owing to solved system's hysteresis quality, only this item just can improve power saving rate 10%-30% under equal operating condition.Owing to adopted level and smooth frequency variation curve, harmonic content is obviously reduced, reduced interference to electrical network.Because the optimization of operating state reaches more than 0.95 power factor, has improved the power utilization rate.Its power saving rate of application of the present invention is minimum to be not less than 40%, reaches as high as 80%.
Description of drawings
The invention will be further described below in conjunction with drawings and Examples.
Fig. 1 is the device schematic diagram that the embodiment of the invention one, embodiment five described methods are used;
Fig. 2 is the schematic flow sheet of the embodiment of the invention one described method;
Fig. 3 is the curve chart of the highest frequency values scope of the embodiment of the invention one described selected motor, variable-frequency governor and load to weight ratio;
Fig. 4 is the frequency change schematic diagram of traditional variable-frequency governor;
Fig. 5 is the embodiment of the invention four described frequency change schematic diagrames.
Embodiment
Embodiment one:
Present embodiment is a kind of frequency converter power-saving control method, and employed hardware system comprises as shown in Figure 1: the frequency converter electricity-saving control device that has CPU and memory element.The flow process of described method is seen shown in Figure 2, and its step comprises:
Accept speed change frequency modulation instruction step, this instruction can be by manually sending, and is perhaps sent by certain transducer of automated system.At refrigerated air-conditioning system, can be an artificial temperature of setting, and this temperature and existing room temperature there be difference, so just need the change temperature for example, strengthen or reduce rotating speed of motor, with the change of realization refrigerating capacity.Also can be that the temperature threshold that indoor temperature sensor reaches certain setting need strengthen or reduce rotating speed of motor, to keep indoor temperature.This frequency control instruction comprises the target frequency value that will reach under normal conditions.
The Information Monitoring step is by the working status parameter of information source collection motor, variable-frequency governor and load.These running parameters comprise current motor speed, the size of load, and a series of parameter of operating state of variable-frequency governor or the like also comprises current frequency values certainly.The parameter of gathering for different systems is different.For example, load is blower fan, and what then gather is flow, the flow velocity of air, the rotating speed of blower motor, moment of torsion.Then need to gather current parameters such as temperature for an air-conditioning system.
Extraction property parameter step according to working status parameter that is obtained and the target frequency value that will reach, is extracted the optkmal characteristics state parameter of corresponding motor, variable-frequency governor and load in database.The optkmal characteristics state parameter that is extracted comprises the various parameters of motor, variable-frequency governor and load.These parameters all in handbook, technical standard or when dispatching from the factory producer in specification, indicate, and be stored in advance in the memory of the employed device of present embodiment.
Comparison step, more existing working status parameter and the target frequency value that will reach, and optkmal characteristics state parameter are optimized and are chosen each parameter.Mainly be by analysis to motor, variable-frequency governor and load to weight ratio curve, seek one with the immediate motor of target frequency, variable-frequency governor and the highest frequency values of load to weight ratio, as shown in Figure 3.This frequency values may have some difference with the target frequency value of former setting, but the frequency values of peak efficiency.
Analyze the step of the cycle of operation, the cycle of operation characteristic of the system that utilization motor, variable-frequency governor and load are formed is sought the hysteresis quality in system described in the transfer process of current frequency values and target frequency value.Driven by motor load is a mechanical system, and variable-frequency governor and motor are formed electric system, and all there is certain hysteresis quality in these two systems, and particularly the speed of mechanical system reaction is slower than electric system usually.And electric system is because the speed of computing, memory space, application of hardware or the like all can have some hysteresis, the characteristic curve of these hysteresis all is stored in the memory of the described device of present embodiment in advance, just can select point or zone useful in these characteristic curves to use when certain changes frequency range when needs.
Realize the step of frequency-modulating process, adjust frequency according to selected target frequency value.
The key of present embodiment is an optimizing process.Described optimization is with the fixed target frequency value of basis, it or not the simple frequency that directly changes, but through optimizing, consider the characteristic of motor, variable-frequency governor and load, seek the optimal working Frequency point, make motor, variable-frequency governor and system works that load is formed in optimum, most effective.Most effective meaning saved the energy most, means economize on electricity.
Embodiment two:
Present embodiment is the prioritization scheme of embodiment one, is the optimization to the information source in the embodiment one described Information Monitoring step.Former variable-frequency governor and the calculus proportional controller PID of comprising of described information.
Variable-frequency governor itself can obtain some parameters of motor and load by some transducers wherein, the situation of the load that driven of the voltage by measuring motor, measurement motor that the electric current change just can be indirect is for example measured the voltage of motor, the situation of electric current also can be measured the operating state of motor equally.In a word, variable-frequency governor itself is exactly an electric system, can obtain the parameter of many motors-load aspect by this electric system.
Calculus proportional controller PID is a kind of controller of extensive use, and the sort controller of use example is all arranged in nearly all industrial control system.Normally set a set-point, with original value compare can draw controlling party to.Simple example is the setting of room conditioning temperature, if indoor current be 30 °, and wish that indoor temperature is 20 °, then only need be on PID design temperature be 20 ° and get final product.Air-conditioning system can be started shooting continuously by interrupted start or frequency conversion and be reached from 30 ° to 20 ° variations in temperature.And the user need not to monitor at all and need not also to know how this process carries out.Present embodiment can be as using the PID controller to regulate usually, and PID changes out the 4-20mA signal and gives frequency converter, and the output frequency of control of conversion device is regulated frequency converter in the certain frequency scope.PID also can directly be transferred to signal on the employed device of present embodiment and regulate.
Embodiment three:
Present embodiment is the prioritization scheme of embodiment one, is the optimization to the information source in the embodiment one described Information Monitoring step.Information source in the Information Monitoring step comprises the external sensor that does not directly obtain parameter by variable-frequency governor.
Described external sensor is a transducer of directly measuring electric current, voltage, flow, speed or the like.The setting of these transducers, the final output that depends primarily on dynamical system is any system.For example be air-conditioning system, then transducer can be directly to measure indoor temperature transmitter, also can be the transducer of measuring refrigeration current of electric, voltage, also can measure the transducer of refrigerant flow or flow velocity.In a word, be a kind of transducer of direct measurement relevant system parameters.The setting of external sensor makes whole motor, variable-frequency governor and load system become closed-loop control system.As embodiment two described systems are open cycle systems, because the source of all parameters of embodiment two described systems all obtains by variable-frequency governor, do not obtain final Control Parameter information.And present embodiment is provided with the effect of external sensor is exactly to change this situation, makes the passage of system's acquired information increase by one, and it is more reliable that motor, variable-frequency governor and system works that load is formed get, and controls more accurate.
Embodiment four:
Present embodiment is the prioritization scheme of embodiment one, is the optimization to embodiment one described realization frequency-modulating process.The frequency change operation curve of traditional frequency conversion speed regulator frequency control as shown in Figure 4, the near sinusoidal square wave.Its frequency change is a step change type, and promptly when detection signal was higher than set point, frequency converter was just exported high-frequency, and when detection signal was lower than set point, frequency converter was with regard to the output low frequency rate.So as previously mentioned change curve has many shortcomings.Present embodiment proposes a kind of diverse mode, makes the variation of frequency modulation curve very level and smooth, as shown in Figure 5.
Present embodiment realizes that the substep in the frequency modulation step comprises:
Slowly the substep of frequency values begins to change frequency with less frequency change rate, whether constantly detects near the target frequency value a section as shown in Figure 5 simultaneously.
Increase fast the substep of frequency values, then strengthen rate of change gradually, the curve that makes frequency change suddenly, simultaneously constantly detection whether near the target frequency value, the b section shown in Fig. 5.
The terminal substep that slowly reduces frequency values when near target frequency, reduces frequency change rate, makes the curve of frequency change mild once more, the c section shown in Fig. 5.
The described frequency variation rate process of present embodiment has been considered the hysteresis quality of whole motor, speed governing frequency converter and load system simultaneously.Under equal operating condition, improve power saving rate 10%-30%; Motor power factor is more than 0.95, and harmonic content is lower than national standard.
Embodiment five:
Present embodiment is a kind of frequency converter electricity-saving control device, as shown in Figure 1, comprise the power subsystem 1 of supplying with the described device energy, the filter cell 2 that the maintenance power supply that is connected with power subsystem is stable, the CPU of carrying out information processing and computing 5 that is connected with filter cell, the memory cell 3 of the stored information that is connected with CPU, two analog quantity input photoelectricity isolated location 4a that are connected with CPU, 4b, import two analog quantity input interface 5a that the photoelectricity isolated locations are connected with two analog quantitys respectively, 5b, two analog quantity output photoelectricity isolated location 9a that are connected with CPU, 9b, export two analog output interface circuit 8a that the photoelectricity isolated locations are connected with two analog quantitys respectively, 8b, two run signal output photoelectricity isolated location 11a that are connected with CPU, 11b, export four run signal output interface 10a that the photoelectricity isolated locations are connected with two run signal respectively, 10b, 10c, 10d, the communication interface 6a that is connected with CPU, 6b, the digital-quantity input interface 7a that is connected with CPU, 7b.
Present embodiment comprises very stable power unit, and what present embodiment used is BSCV3-220S05 type power supply, and for the filter unit that improves the antijamming capability use is HT401-1-P21-P2, employed CPU is ATMEGA48AU0729, and memory is LS151.
Described analog quantity input interface can connect the external sensor with analog quantity output.Described analog output interface circuit can connect frequency converter analog quantity input interface.Described run signal output interface can be connected with the variable-frequency governor runnable interface, output speed governing frequency variation signal.Described communication interface can be connected with the communication interface of variable-frequency governor, the various data parameters of input and output and variable-frequency governor.Or be connected with hosts such as work station, computers in the adjusting stage.Described digital-quantity input interface can directly be imported various data-signals, and for example the external sensor of exporting with digital quantity also can connect the digital quantity interface of frequency converter operation etc.
Embodiment six:
Present embodiment is the preferred version of embodiment five, be among the embodiment five about the refinement scheme of communication interface, described communication interface is RS485/232 interface or Ethernet interface, these two kinds of interfaces all are various variable-frequency governors interfaces commonly used.The communications protocol of present embodiment support is MODBUS, CANOPEN agreement.
Claims (4)
1. frequency converter power-saving control method, employed hardware comprises: the power subsystem of the feedway energy, the stable filter cell of maintenance power supply that is connected with power subsystem, the CPU of carrying out information processing and computing that is connected with filter cell, the memory cell of the stored information that is connected with CPU, two analog quantity input photoelectricity isolated locations that are connected with CPU, import two analog quantity input interfaces that the photoelectricity isolated locations are connected with two analog quantitys respectively, two analog quantity output photoelectricity isolated locations that are connected with CPU, export two analog output interface circuits that the photoelectricity isolated locations are connected with two analog quantitys respectively, two run signal output photoelectricity isolated locations that are connected with CPU, export four run signal output interfaces that the photoelectricity isolated locations are connected with two run signal respectively, the communication interface that is connected with CPU, the switch value input interface that is connected with CPU is characterized in that the step of described method:
Accept speed change frequency modulation instruction step, this instruction can be by manually sending, and is perhaps sent by certain transducer of automated system;
The Information Monitoring step is by the working status parameter of information source collection motor, variable-frequency governor and load;
Extraction property parameter step, according to working status parameter that is obtained and the target frequency value that will reach, in database, extract the optkmal characteristics state parameter of corresponding motor, variable-frequency governor and load, described optkmal characteristics state parameter comprises the various parameters of motor, variable-frequency governor and load, these parameters all in handbook, technical standard or when dispatching from the factory producer in specification, indicate, and in advance in the storage memory cell;
Comparison step, more existing working status parameter and the target frequency value that will reach, and optkmal characteristics state parameter, optimize and choose each parameter, it is by the analysis to motor, variable-frequency governor and load to weight ratio curve that each parameter is chosen in described optimization, seek one with the immediate motor of target frequency, variable-frequency governor and the highest frequency values of load to weight ratio;
Analyze the step of the cycle of operation, the cycle of operation characteristic of the system that utilization motor, variable-frequency governor and load are formed is sought the hysteresis quality in the system that motor described in the transfer process of current frequency values and target frequency value, variable-frequency governor and load are formed;
Realize the step of frequency-modulating process, adjust frequency according to selected target frequency value.
2. a kind of frequency converter power-saving control method according to claim 1 is characterized in that the information source in the described Information Monitoring step comprises variable-frequency governor and ratio calculus controller PID.
3. a kind of frequency converter power-saving control method according to claim 1 is characterized in that the information source in the described Information Monitoring step comprises the external sensor that does not directly obtain parameter by variable-frequency governor.
4. a kind of frequency converter power-saving control method according to claim 1 is characterized in that the substep in the step of described realization frequency-modulating process:
Whether slowly the substep of frequency values begins to change frequency with less frequency change rate, constantly detect simultaneously near the target frequency value;
Increase fast the substep of frequency values, then strengthen rate of change gradually, the curve that makes frequency change suddenly, simultaneously constantly detection whether near the target frequency value;
The terminal substep that slowly reduces frequency values when near target frequency, reduces frequency change rate, makes the curve of frequency change mild once more.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN102545773A (en) * | 2012-01-18 | 2012-07-04 | 苏州凯营自动化设备有限公司 | Motor control method and device as well as two-for-one twister |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN101425808B (en) * | 2008-10-24 | 2013-02-13 | 上海新时达电气股份有限公司 | Slope rate addition method for automatically generating S shaped frequency curve by frequency transformer |
| CN101414837B (en) * | 2008-10-24 | 2013-02-13 | 上海新时达电气股份有限公司 | Slope table search method for automatically generating S-shaped frequency curve of frequency changer |
| CN102185560A (en) * | 2011-04-27 | 2011-09-14 | 河北联合大学 | Control method for energy conservation and frequency conversion of motor |
| ITMI20111867A1 (en) * | 2011-10-13 | 2013-04-14 | Gima Spa | PROCEDURE FOR THE COMMAND AND CONTROL OF THE ELECTRIC MOTOR OF AN AUTOMATION SYSTEM AND CONNECTED SYSTEM |
| CN102854794A (en) * | 2012-08-14 | 2013-01-02 | 王兆进 | Intelligent medium-short wave infrared drying equipment controller |
| CN102866658B (en) * | 2012-08-22 | 2014-11-19 | 三一重工股份有限公司 | Frequency-variable lifting device monitoring method and system, and mixing plant |
| CN117232098B (en) * | 2023-11-14 | 2024-02-06 | 广东精冷源建设有限公司 | Automatic adjusting method and system based on energy control of frequency converter |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN102545773A (en) * | 2012-01-18 | 2012-07-04 | 苏州凯营自动化设备有限公司 | Motor control method and device as well as two-for-one twister |
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