CN107154771B - Fan frequency control system for converters - Google Patents
Fan frequency control system for converters Download PDFInfo
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- CN107154771B CN107154771B CN201710552685.4A CN201710552685A CN107154771B CN 107154771 B CN107154771 B CN 107154771B CN 201710552685 A CN201710552685 A CN 201710552685A CN 107154771 B CN107154771 B CN 107154771B
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- 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
- H02P27/00—Arrangements or methods for the control of AC motors characterised by the kind of supply voltage
- H02P27/04—Arrangements or methods for the control of AC motors characterised by the kind of supply voltage using variable-frequency supply voltage, e.g. inverter or converter supply voltage
- H02P27/06—Arrangements or methods for the control of AC motors characterised by the kind of supply voltage using variable-frequency supply voltage, e.g. inverter or converter supply voltage using dc to ac converters or inverters
- H02P27/08—Arrangements or methods for the control of AC motors characterised by the kind of supply voltage using variable-frequency supply voltage, e.g. inverter or converter supply voltage using dc to ac converters or inverters with pulse width modulation
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M1/00—Details of apparatus for conversion
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- 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
- H02P5/00—Arrangements specially adapted for regulating or controlling the speed or torque of two or more electric motors
- H02P5/74—Arrangements specially adapted for regulating or controlling the speed or torque of two or more electric motors controlling two or more ac dynamo-electric motors
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- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Inverter Devices (AREA)
Abstract
The present invention relates to a kind of fan frequency control systems for converters, carry out frequency control for the cooling fan to converters.Converters include power switch tube radiator and reactor；Cooling fan is single phase ac blower；Fan frequency control system includes: temperature sensing circuit, for detecting the temperature and output power switching tube heat-sink temperature signal and reactor temperature signal of power switch tube radiator and reactor；Controller, for generating frequency instruction according to power switch tube heat-sink temperature signal and reactor temperature signal；And frequency converter, it is connect with controller and DC power supply, for carrying out transformation of electrical energy to DC power supply, generates the alternating voltage of frequency instruction to single phase ac blower, and then adjust the revolving speed of single phase ac blower.Above-mentioned fan frequency control system reduces the electricity consumption and noise of cooling fan while solving the heat dissipation problem of power switch tube radiator and reactor to greatest extent.
Description
Technical field
The present invention relates to motor control technology fields, more particularly to a kind of fan frequency conversion for converters
Speed-regulating system.
Background technique
High-power power electronic converter can generate a large amount of heat during carrying out transformation of electrical energy, lead to internal device
The temperature of part is substantially increased, power switch tube (such as IGBT, GTO), reactor and capacitor in converters etc.
If device long-term work is under over-temperature conditions, it may occur that damage influences the normal operation of converters.Therefore needs pair
Power switch tube, reactor and capacitor radiate.High-power power electronic converter mainly uses wind-cooling heat dissipating, that is, passes through
Additional blower, and corresponding heat dissipation wind channel is designed to achieve the purpose that heat dissipation.The operation power of high-power power electronic converter
Range it is generally all relatively wide, and it runs changed power also relatively frequently in certain applications field, such as photovoltaic converter root
According to the power of illumination, wind electric converter according to the size of wind speed, different power grades is all often operated in.With power electronics
Converter operation power variation, power switch tube, reactor, capacitor the degree of heat can also occur to become accordingly
Change.Currently, the cooling fan to be used of the water cooling system of high-power power electronic converter is more, and generally without adjusting
Speed causes biggish energy consumption and noise.
Summary of the invention
Based on this, it is necessary to provide the fan frequency control for converters of a kind of low energy consumption, low noise
System.
A kind of fan frequency control system for converters, for being dissipated to the converters
Air-heater carries out frequency control, and the converters include power switch tube radiator and reactor；The radiation air
Machine is single phase ac blower；The fan frequency control system includes:
Temperature sensing circuit, for detecting the temperature and output power of the power switch tube radiator and the reactor
Switch the temperature signal of tube radiator and the temperature signal of reactor；
Controller is connect with the temperature sensing circuit, for the temperature signal according to the power switch tube radiator
Frequency instruction is generated with the temperature signal of the reactor；And
Frequency converter is connect with the controller；The frequency converter is connect with DC power supply；The frequency converter is used for direct current
Power supply carries out transformation of electrical energy, generates alternating voltage that frequency is the frequency instruction to the single phase ac blower, and then adjust
The revolving speed of the single phase ac blower.
Above-mentioned fan frequency control system according in converters power switch tube radiator temperature and reactance
Device temperature carries out frequency control to single phase ac blower, is solving the same of the heat dissipation problem of power switch tube radiator and reactor
When, the electricity consumption and noise of cooling fan are reduced to greatest extent.
The controller includes frequency instruction module in one of the embodiments,；The frequency instruction module is stored with
The power switch tube radiator temperature table corresponding with frequency instruction and the reactor temperature and the corresponding table of frequency instruction；It is described
Frequency instruction module is used to inquire the power switch tube radiator temperature according to the temperature signal of the power switch tube radiator
It spends table corresponding with frequency instruction and obtains first frequency instruction, the reactor temperature is inquired according to the temperature signal of the reactor
Corresponding with frequency instruction table obtains second frequency instruction, and using the greater in first frequency instruction and second frequency instruction as
Frequency instruction.
It in one of the embodiments, further include LC filter；The LC filter is connected to the frequency converter and described
Between single phase ac blower.
The single phase ac blower includes main winding and auxiliary winding in one of the embodiments,；The frequency converter is two
Phase three-leg inverter；The output terminal a of the main winding, the output terminal b of the auxiliary winding, the main winding and auxiliary winding
The output terminal n of junction is connected with the output terminal at three bridge arm midpoints of the two-phase three-leg inverter respectively.
It in one of the embodiments, further include n line current detection module；The controller further includes n line open circuit protection
Module；The n line current detection module is connected between the frequency converter and the output terminal n of the single phase ac blower, is used for
The n line current that detects the n line current when single phase ac fan operation, and will test is sent to the n line open circuit protection mould
In block；The n line open circuit protection module is for the n line current when the single phase ac fan operation continuously less than predetermined current
When the time of value reaches preset time, judges that the single phase ac blower is in n line open circuit fault state, control the frequency converter
It stops working and the frequency converter is forbidden to start automatically again.
The controller further includes voltage compensation module and voltage control module in one of the embodiments,；
The voltage compensation module is connect with the frequency instruction module, for receiving the frequency instruction；The voltage
Compensating module is also used to receive the information of number of the single phase ac blower, and according to the number of the single phase ac blower and institute
It states frequency instruction and generates voltage compensation value；
The voltage control module is connect with the voltage compensation module and the frequency instruction module respectively；The voltage
Control module is used to obtain corresponding voltage instruction value according to the frequency instruction, and by the voltage instruction value and the voltage
Voltage given value after offset addition as the main winding and the auxiliary winding.
The controller further includes the number of turns processing modules such as not in one of the embodiments,；The not equal processing of described the number of turns
The output end of the voltage control module is arranged in module；Not etc. processing modules are not used in the main winding and described described the number of turns
The number of turns conversion processing is carried out to the voltage given value when umber of turn of auxiliary winding is unequal so that be added to the main winding and
The amplitude of voltage on the auxiliary winding is corresponding with the number of turns.
It in one of the embodiments, further include current detection circuit, the current detection circuit is for acquiring the list
The main winding current and auxiliary winding electric current of phase AC blower fan；The controller further includes current processing module；The current processing
Module is used to obtain corresponding main winding current virtual value and auxiliary winding according to the main winding current and the auxiliary winding electric current
Current effective value；The current processing module is also used to effective according to the main winding current virtual value, the auxiliary winding electric current
Value generates given voltage offset and compensates to the voltage given value, so that the main winding magnetomotive force and the auxiliary winding
Magnetomotive force is equal, and the single phase ac blower is made to generate turned magnetic motive force.
The controller includes weak magnetism speed expansion module in one of the embodiments,；The weak magnetism speed expansion module is used for
When the power switch tube radiator temperature or the reactor temperature are higher than corresponding temperature threshold, the blow-up is controlled
The input voltage of flow fan is rated operational voltage, and controls the frequency instruction module and generate and be higher than the single phase ac blower
Rated operation frequency frequency instruction value, make the single phase ac blower higher than rated speed run.
The controller further includes temperature abnormality detection processing module in one of the embodiments,；The temperature detection
Exception processing module is used to receive the temperature signal or the reactor of the power switch tube radiator in the controller
Temperature signal when having abnormal, or the controller can not receive the power switch tube radiator temperature signal or
When the temperature signal of the reactor, the frequency instruction module is controlled by rated frequency and instructs output, and then controls the list
Phase AC blower fan is run by rated speed.
Detailed description of the invention
Fig. 1 is the structural block diagram of the fan frequency control system in an embodiment；
Fig. 2 is the structural representation that the fan frequency control system in an embodiment controls multiple single phase ac blowers
Figure；
Fig. 3 is the wiring schematic diagram of frequency converter in an embodiment, LC filter and single phase ac blower；
Fig. 4 is the structural block diagram of the controller in an embodiment；
Fig. 5 is voltage compensation value in an embodiment with the change curve of frequency instruction and single phase ac blower number；
Fig. 6 is the operational process schematic diagram of the fan frequency control system in an embodiment.
Specific embodiment
In order to keep being more clear for the objectives, technical solutions, and advantages of the present invention statement clear, below in conjunction with attached drawing and reality
Example is applied, the present invention will be described in detail.It should be appreciated that described herein, specific examples are only used to explain the present invention,
It is not intended to limit the present invention.
The fan frequency control system for converters in one embodiment, can be adapted for photovoltaic converter
Heat dissipation, be equally applicable to wind electric converter or the heat dissipation of other converters, the scope of application be wider.In the present embodiment
In, it is illustrated by taking heat dissipation of the fan frequency control system for photovoltaic converter as an example.Specifically, the fan frequency control
System is used to carry out variable frequency regulating speed control to the single phase ac blower of photovoltaic DC-to-AC converter.Photovoltaic DC-to-AC converter includes three road power switch
Tube radiator and reactor, therefore every photovoltaic DC-to-AC converter needs to install four cooling fans.Real work in photovoltaic generating system
The number of photovoltaic DC-to-AC converter can be determined according to actual generated output.For example, for the photovoltaic generating system of 1MW,
It is composed in parallel by two 500KW photovoltaic DC-to-AC converters.When generated output is less than 300KW, it is only necessary to it is inverse to open a 500KW photovoltaic
Become device, therefore also only needs to open four cooling fans corresponding with the photovoltaic DC-to-AC converter.Specific method can be by exchanging relay
Device controls being connected and disconnected from for frequency conversion speed-adjusting system four cooling fans corresponding with each photovoltaic DC-to-AC converter.When generated output is big
When 300KW, then two photovoltaic DC-to-AC converters are opened simultaneously, and generated output is divided equally, it is at this time that corresponding cooling fan is whole
It opens.In the present embodiment, cooling fan is all made of single phase ac centrifugal fan, voltage rating 230V, and rated frequency is
60Hz, number of pole-pairs 1.In other embodiments, other kinds of single phase ac blower can also be selected as cooling fan.
Fig. 1 be an embodiment in fan frequency control system structural block diagram, the fan frequency control system for pair
The cooling fan of converters carries out frequency control.In the present embodiment, cooling fan is single phase ac blower 20.It should
Fan frequency control system includes temperature sensing circuit 100, controller 200 and frequency converter 300.Wherein, controller 200 respectively with
Temperature sensing circuit 100 and frequency converter 300 connect.
Temperature sensing circuit 100 is used to detect the temperature and output work of power switch tube (such as IGBT) radiator and reactor
Rate switchs the temperature signal of tube radiator and the temperature signal of reactor.In one embodiment, temperature sensing circuit 100 can lead to
The temperature sensors such as thermal overload resistor or thermocouple detect the radiator of power switch tube and the temperature of reactor, and pass through
Over-sampling modulate circuit is converted, and final temperature signal is conveyed to controller 200.In the present embodiment, to photovoltaic inversion
The power switch tube radiator of device and the temperature of reactor are all made of thermal resistance and measure.Sky is occupied to save cost and reducing
Between, the temperature sensing circuit 100 of fan frequency control system can directly use the temperature sampling circuit generation of photovoltaic DC-to-AC converter itself
It replaces, the temperature signal of power switch tube radiator and the temperature signal of reactor are first transmitted at the digital signal of photovoltaic DC-to-AC converter
Device is managed, then above-mentioned temperature signal is communicatively transmitted to by frequency conversion speed-adjusting system by the digital signal processor of photovoltaic DC-to-AC converter
Controller 200.
The temperature signal and electricity for the power switch tube radiator that controller 200 is used to be exported according to temperature sensing circuit 100
The temperature signal of anti-device generates frequency instruction, and frequency instruction is used to control the revolving speed of single phase ac blower 20.Work as power switch tube
When radiator temperature or higher reactor temperature, a higher frequency instruction is exported；When power switch tube radiator temperature and
When reactor temperature is all lower, a lower frequency instruction is exported, so that single phase ac blower 20 is guaranteeing switching tube heat dissipation
Under the premise of the heat of device and reactor sheds in time, energy consumption is reduced to greatest extent and reduces noise.
Frequency converter 300 with DC power supply for connecting.Frequency converter 300 is used to carry out electricity to DC power supply according to frequency instruction
It can convert, output frequency is the alternating voltage of frequency instruction to single phase ac blower 20, to realize to single phase ac blower 20
Frequency control.In one embodiment, DC power supply can be independent power supply, or photovoltaic DC-to-AC converter or wind-powered electricity generation unsteady flow
The DC bus of the converters such as device.In the present embodiment, DC power supply is the DC bus of photovoltaic generating system, should
DC bus is from the header box of photovoltaic generating system or the lead-out wire of DC-DC converter.
Temperature sensing circuit 100 in above-mentioned fan frequency control system is to the power switch tube in converters
The temperature of radiator and reactor is detected and exports the temperature signal of above-mentioned device.Controller 200 receives above-mentioned temperature
After signal, frequency instruction can be generated according to these temperature signals, and then control frequency converter 300 and electric energy change is carried out to DC power supply
It changes, output frequency is the alternating voltage of frequency instruction to single phase ac blower 20, realizes the frequency conversion tune to single phase ac blower 20
Speed.Above-mentioned fan frequency control system is asked in the heat dissipation of the power switch tube radiator and reactor that solve converters
While topic, the electricity consumption and noise of blower can be reduced to greatest extent.In the present embodiment, since frequency converter 300 is direct
By the DC bus powered of photovoltaic generating system, the reduction of blower electricity consumption, it is meant that the increase of photovoltaic power generation quantity, improve through
Ji benefit.
Fig. 2 is the structural representation that the fan frequency control system in an embodiment controls multiple single phase ac blowers
Figure carries out structure explanation for the fan frequency control system to above-mentioned 1MW photovoltaic generating system.In Fig. 2, above 4 blowers
It is respectively used to following 4 blowers to three power switch tubes of every 500KW photovoltaic DC-to-AC converter of 1MW photovoltaic generating system
Radiator and reactor radiate, and are attached respectively by an AC relay 30 with frequency conversion speed-adjusting system.Exchange
Relay 30 is for controlling switching on and off between frequency conversion speed-adjusting system and single phase ac blower 20.
In the present embodiment, for DC bus-bar voltage in 800~1000V, frequency converter 300 and photovoltaic DC-to-AC converter just start fortune
Row.When DC bus-bar voltage is lower than 800V or is higher than 1000V, frequency converter 300 and photovoltaic DC-to-AC converter are shut down.For save at
This, single phase ac blower 20 uses common single phase ac blower, non-frequency blower in the present embodiment.To avoid rotation speed change too fast
Blower quality is impacted, the frequency pace of change of the PWM modulation wave of frequency converter 300 can not be configured excessively high, but simultaneously
The rapidity of blower starting and braking need to be taken into account.In the present embodiment, setting single phase ac blower 20 is increased to volume from static
Determine revolving speed (namely rated frequency) time and from rated speed drop to 0 rev/min used in the time be 3 seconds.In others
In embodiment, blower can also be arranged from the static time for being increased to rated speed and from the time that rated speed drops to 0
It is 2 seconds~4 seconds.In the present embodiment, controller 200 can detect whether to meet compressor start up condition when receiving power-on command, main
Detect whether the conditions such as DC bus-bar voltage, the IGBT radiator of photovoltaic DC-to-AC converter and reactor temperature, environment temperature meet
Be switched on operating index.Meet and enter in next step, is unsatisfactory for then carrying out cycle detection to compressor start up condition until meeting.
In one embodiment, above-mentioned fan frequency control system further includes LC filter 400, as shown in Figure 1.LC filter
400 are arranged between frequency converter 300 and single phase ac blower 20.Fig. 3 is single phase ac blower 20, frequency converter in the present embodiment
The wiring schematic diagram of 300 and LC filter 400.In Fig. 3, single phase ac blower 20 includes main winding 22 and auxiliary winding 24, is become
Frequency device 300 uses two-phase three-leg inverter, and IGBT can be used in switching tube M1~M6 of two-phase three-leg inverter.Main winding
The output terminal n of 24 junction output terminal b, main winding 22 and auxiliary winding of 22 output terminal a, auxiliary winding 24 passes through respectively
LC filter 400 is connect with the A phase output terminals of two-phase three-leg inverter, B phase output terminals and N line output terminal.LC
Filter 400 is for weakening influence of the DC bus-bar voltage to the machine winding of single phase ac blower 20.High-power electric and electronic
The DC bus-bar voltage of converter is generally higher, if LC filter 400 is not added, the electricity being added on main winding 22 and auxiliary winding 24
Pressure will be directly equal to DC bus-bar voltage, be easy to puncture machine winding.
Since blower winding inherently has filter action, so the filter action of LC filter 400 does not have to setting too
By force.The resonance frequency of LC filter 400 need to meet following formula:
Wherein, fnFor the maximum value of frequency converter running frequency；fresFor the resonance frequency of LC filter；fswIt is opened for frequency converter
Close frequency.In addition, the design of LC filter 400 also needs to guarantee the maximum value for the voltage being added in machine winding no more than single-phase
The maximum working voltage of alternating current generator 20.In the present embodiment, the running frequency of frequency converter 300 is 15~63Hz, switching frequency
fswFor 10kHz, the maximum working voltage of load motor 20 is 358V, the L=240uH of design, C=20uF.At this point, LC is filtered
The resonance frequency of wave device 400 is 1625Hz, the 0.027 of amplitude, variable frequency range before the voltage harmonic of switching frequency is attenuated to
Voltage in (15-63Hz) is almost undamped.
In one embodiment, above-mentioned fan frequency control system further includes n line current detection module 50, as shown in Figure 3.Phase
Ying Di further includes n line open circuit protection module in controller 200.Single phase ac blower 20 is arranged in n line current detection module 50
On the line of output terminal n and LC filter 400, the electric current on the n line to single phase ac blower 20 is detected and is incited somebody to action
The n line current detected is sent in n line open circuit protection module.N line current detection module 50 can use current sensor.When with
One frequency converter simultaneously with multiple single phase ac blowers 20 when, cope with each single phase ac blower 20 and a n line current be set
Detection module 50.When n line current when single phase ac blower 20 is run reaches default continuously less than the time of pre-set current value
Between when, single phase ac blower 20 be in n line open circuit fault state to the judgement of n line open circuit protection module at this time, controls frequency converter 300 and stops
It only works and forbids its automatic starting again, then overhauled.Pre-set current value can be set to the current value of a very little.
The introducing of preset time is primarily to by the n line current phase region of the n line current of operational process and start-up course and stopping process
Point, prevent failure from judging by accident.In the present embodiment, pre-set current value is set as 10mA, and preset time is set as 200ms.N line open circuit protection mould
The effect of block is when preventing single phase ac blower 20 from restarting, and the n line open circuit of single phase ac blower 20 makes 22 He of main winding
Auxiliary winding 24 is connected in a winding, and single phase ac blower 20 can not generate detent torque, winding current will increased dramatically will it is main around
Group 22 and auxiliary winding 24 are burnt.In the present embodiment, the inspection of n line current is equipped on the n line of each single phase ac blower 20 in Fig. 2
Survey module 50.There is blower to occur having wind in n line open circuit fault or only following 4 blowers when only having in 4 blowers above
When n line open circuit fault occurs in machine, controller 200 will connect the friendship of n line open circuit fault occurs in this 4 blowers and frequency converter 300
Current relay 30 disconnects, and n line open circuit information is communicatively transmitted to the digital signal processor of photovoltaic DC-to-AC converter, number
After signal processor receives blower n line open circuit information, light corresponding with 4 blowers of n line open circuit fault occur will be closed
Inverter is lied prostrate, an other photovoltaic DC-to-AC converter is only opened, continues photovoltaic power generation.Only above in Fig. 24 blowers and under
When having blower that n line open circuit fault occurs in the blower of 4, face, two photovoltaic DC-to-AC converters are just all shut down.In addition, n line current is examined
Over-current detection can also be carried out by surveying module 50, and when n line current is excessive, frequency converter 300 stops working.The n of single phase ac blower 20
Line open circuit may be that the conducting wire disconnection between output terminal n and the LC filter 400 due to single phase ac blower 20 causes.
Fig. 4 is the structural block diagram of the controller in an embodiment.In one embodiment, controller 200 includes frequency instruction
Module 210.Power switch tube radiator temperature table corresponding with frequency instruction is stored in frequency instruction module 210.Table 1 is a tool
IGBT radiator temperature table corresponding with frequency instruction in body embodiment.
Table 1:
| IGBT radiator temperature T (DEG C) | Frequency instruction (Hz) |
| T≤45 | 0 |
| 45 T≤50 < | 15 |
| 50 T≤55 < | 21 |
| 55 T≤60 < | 27 |
| 60 T≤65 < | 33 |
| 65 T≤70 < | 39 |
| 70 T≤75 < | 45 |
| 75 T≤80 < | 54 |
| 80 T≤90 < | 60 |
| T > 90 | 63 |
Corresponding frequency values can be inquired using table 1 according to IGBT temperature, and are instructed as first frequency.Frequency
Reactor temperature is also stored in instruction module and frequency instruction corresponds to table.Table 2 is the reactor temperature in a specific embodiment
Table corresponding with frequency instruction.
Table 2:
| Reactor temperature T (DEG C) | Frequency instruction (Hz) |
| T≤45 | 0 |
| 45 T≤50 < | 15 |
| 50 T≤55 < | 18 |
| 55 T≤60 < | 21 |
| 60 T≤65 < | 24 |
| 65 T≤70 < | 27 |
| 70 T≤75 < | 30 |
| 75 T≤80 < | 33 |
| 80 T≤85 < | 36 |
| 85 T≤90 < | 39 |
| 90 T≤95 < | 42 |
| 95 T≤100 < | 45 |
| 100 T≤105 < | 48 |
| 105 T≤110 < | 51 |
| 110 T≤115 < | 54 |
| 115 T≤120 < | 57 |
| 120 T≤140 < | 60 |
| T > 140 | 63 |
Corresponding frequency values can be inquired using table 2 according to reactor temperature, and are instructed as second frequency.Frequently
Rate instruction module 210 is also compared first frequency instruction and second frequency instruction, using a biggish frequency as frequency
Instruction, and then the frequency for controlling single phase ac blower 20 is frequency instruction ωe *。
Since the present embodiment is to use common single phase ac blower 20 as frequency conversion fan, so the tune of frequency converter 300
Fast range is not provided with very wide, in order to avoid motor is damaged.In the present embodiment, the IGBT radiator temperature of photovoltaic DC-to-AC converter
When degree and reactor temperature are below 45 DEG C, forbid the PWM of enabled frequency converter 300, frequency converter 300 is out of service；When photovoltaic is inverse
Become the IGBT radiator temperature of device higher than 80 DEG C or when reactor temperature is higher than 120 DEG C, frequency converter 300 is transported by amount frequency 60Hz
Row.
In one embodiment, controller 200 further includes voltage compensation module 220 and voltage control module 230, such as Fig. 4 institute
Show.Voltage compensation module 220 is connect with frequency instruction module 210, for receiving frequency adjustment instructions ωe *The list controlled with needs
The information of number of phase AC blower fan, thus according to the number of single phase ac blower and frequency instruction ωe *Generate voltage compensation value Vd。
In the present embodiment, voltage compensation value V is stored in voltage compensation module 220dWith single phase ac blower number and frequency instruction
ωe *Change curve, as shown in Figure 5.The change curve can be obtained by previous experiments.Specifically, change is allowed during the experiment
Frequency device 300 with different number blowers (blower number is generally 4 multiple, each phase IGBT radiator of every three-phase inverter and
Reactor respectively needs a fan radiating), these blowers are measured when running under different frequency instructs, and blower input voltage falls
Fall situation.According to the compensation of voltage fallen situation and carry out frequency converter voltage instruction value, above-mentioned voltage instruction offset is recorded, is drawn
Voltage instruction offset processed with blower number and rotation speed of fan change curve.Therefore, according to the single phase ac blower got
Number and frequency instruction ωe *Corresponding voltage compensation value V can be inquiredd。
Voltage control module 230 is connect with voltage compensation module 220 and frequency instruction module 210 respectively.Voltage controls mould
Block 230 is used to obtain corresponding voltage instruction value V according to the frequency instruction that frequency instruction module 210 exportsG, and by the voltage
Instruction value VGWith voltage compensation value VdVoltage given value V after being summed as main winding and auxiliary windingS.In one embodiment,
Voltage control module 230 includes constant voltage and frequency ratio unit 232 and adder 234.Constant voltage and frequency ratio unit 232 is used for according to constant voltage and frequency ratio
Determine voltage instruction value V corresponding with frequency instructionG.Adder 234 is then used for voltage instruction value VGWith voltage compensation value Vd
Addition obtains voltage given value VS。
In one embodiment, controller 200 further includes the number of turns processing modules 240 such as not.Not etc. processing modules 240 are not set the number of turns
Set the output end of the adder 234 in voltage control module 230.The number of turns not etc. processing modules 240 according to main winding and it is secondary around
The turn number N of groupa、NbTo voltage given value VSThe number of turns conversion is carried out, the amplitude for the voltage being added on main winding and auxiliary winding is made
It is corresponding with the number of turns, to make the rotating mmf of motor closer to turned magnetic motive force.Enable A phase, B phase voltage given value
Amplitude is respectively VA、VB, specific implementation process are as follows:
When the resistance of winding is smaller, the induced electromotive force of winding is approximately equal with winding both end voltage.At this point, setting
VA、VBIt is respectively as follows:
When the resistance of winding is larger, the induced electromotive force of winding can be ignored, it is believed that winding both end voltage is powered on winding
The pressure drop of resistance is approximately equal.At this point, main winding and auxiliary winding both end voltage are proportional with the electric current in corresponding windings respectively.
To generate turned magnetic motive force, V at this time is setA、VBIt is respectively as follows:
In the present embodiment, machine winding resistance is smaller, using the first umber of turn processing modes such as not.
In one embodiment, above-mentioned fan frequency control system further includes current detection circuit 500, as shown in Figure 1.Electric current
Detection circuit 500 is used to detect the main winding current and auxiliary winding electric current of single phase ac blower 20.In the present embodiment, controller
200 further include current processing module 250, as shown in Figure 4.Current processing module 250 is used for according to main winding current and auxiliary winding
Electric current obtains corresponding main winding current virtual value IARMSWith auxiliary winding current effective value IBRMS.Current processing module 250 is according to master
Winding current virtual value IARMSWith auxiliary winding current effective value IBRMSVoltage compensation value is generated to compensate to voltage given value VSOn, with
So that main winding magnetomotive force is equal with auxiliary winding magnetomotive force.Specifically, current processing module 250 includes that the number of turns does not wait processing units
252, subtracter 254 and pi regulator 256.Correspondingly, voltage control module 230 further includes subtracter 236.The number of turns is not etc.
Unit 252 is managed to be used to carry out the number of turns conversion to current effective value when the coil turn of main winding and auxiliary winding is not waited.The number of turns folding
Current effective value after calculation is sent into pi regulator 256 after making the difference by subtracter 254, and pi regulator 256 handles difference
After output it value be sent into subtracter 236 in, to voltage given value VSIt compensates.It is carried out by current processing module 250
Voltage compensation can make main winding magnetomotive force equal with auxiliary winding magnetomotive force, so that it is guaranteed that the magnetic field of single phase ac blower 20 is
Circular rotating field reaches the internal loss for reducing single phase ac blower 20, reduces calorific value, improves the output torque of motor
Purpose.In addition, current detection circuit 500 is also used to carry out the over-current detection of main winding current and auxiliary winding electric current, when winding
When electric current is excessive, frequency converter 300 stops working.
In one embodiment, the A phase of frequency converter 300 uses SPWM to modulate with B phase, the modulating wave difference 90 of A phase and B phase
Degree.N phase then use duty ratio constant for 50% modulation system.In the present embodiment, controller 200 further includes SPWM module
260.SPWM module 260 drives the IGBT of frequency converter 300 for generating pwm signal.In this embodiment, SPWM module 260 can also
According to the variation of DC bus-bar voltage, (in photovoltaic generating system, DC bus-bar voltage often becomes with the variation of intensity of illumination
Change), the amplitude size of the modulating wave of dynamic regulation A phase and B phase ensures that frequency converter 300 exports required fan end voltage.
In one embodiment, controller 200 further includes weak magnetism speed expansion module.Weak magnetism speed expansion module is used in power switch tube
When radiator temperature or reactor temperature are more than corresponding temperature threshold, the input voltage of control single phase ac blower 20 is volume
Fixed working voltage, and control frequency instruction module 210 and generate the frequency for being slightly above the rated operation frequency of single phase ac blower 20
Instruction value makes single phase ac blower 20 be slightly above rated speed operation, further increases the air output of single phase ac blower 20.This
In embodiment, the concrete methods of realizing of weak magnetism speed expansion module is when the IGBT radiator temperature of photovoltaic DC-to-AC converter is higher than 90 DEG C or electricity
When anti-device temperature is higher than 140 DEG C, starts weak magnetism speed expansion module, frequency instruction is increased to 63Hz, and keep voltage instruction value VG
It is constant for voltage rating 230V, increase blower air output；When the IGBT radiator temperature of photovoltaic DC-to-AC converter is greater than 95 DEG C or reactance
When device temperature is greater than 160 DEG C, photovoltaic DC-to-AC converter will be out of service and stopping signal is transmitted to controller 200, and controller 200 receives
After stopping signal, when continuing to run until that IGBT radiator temperature and reactor temperature are below 60 DEG C, controller 200 is issued
Halt instruction keeps frequency converter 300 out of service.
In one embodiment, controller 200 further includes temperature abnormality detection processing module.Temperature abnormality detection processing module
For detect controller 200 receive the power switch tube radiator temperature signal or the reactor temperature letter
Number have when abnormal (such as too high or too low for temperature) or controller 200 can not receive the temperature of the power switch tube radiator
When the temperature signal of degree signal or the reactor, frequency converter 300 is controlled according to the voltage rating and volume of single phase ac blower 20
Determine power to be exported, to ensure that the heat of device in converters can shed in time.Temperature abnormality detection may be
Due to temperature sensor fault, for the over-sampling modulate circuit failure of temperature detection or the controller of photovoltaic DC-to-AC converter and frequency conversion tune
Communication disruption etc. between the controller 200 of speed system causes.
In one embodiment, in the process of running, can constantly detect this frequency conversion speed-adjusting system is fan frequency control system
It is no faulty.Mainly by current sensor, current Hall sensor, divider resistance, temperature sensor respectively to single phase ac
The temperature of the n line current of blower 20, the A phase current of frequency converter 300 and B phase current, DC bus-bar voltage, frequency converter IGBT radiator
Degree and environment temperature etc. are detected, so judge this frequency conversion speed-adjusting system whether have occurred the open circuit of blower n line, overcurrent, over-voltage,
The failures such as excess temperature.Continue enabled PWM if not having failure, drive fan operation, and the constantly IGBT of detection photovoltaic DC-to-AC converter simultaneously
Radiator temperature and reactor temperature adjust the speed single phase ac blower according to temperature signal；If faulty, shut down.
In one embodiment, above-mentioned fan frequency control system can also be communicated with host computer, to make user can
To carry out the issuing of control instruction, the setting of operational mode (automatic mode or manual model), operating parameter by host computer
It is arranged, quantity of state and running simulation amount are checked.
In the present embodiment, the operational process schematic diagram of above-mentioned fan frequency control system is as shown in fig. 6, include following step
It is rapid:
Step S602, judges whether there is power-on instruction.
If receiving power-on instruction thens follow the steps S604, no to then follow the steps S630.
Step S604 receives the mode selection command that host computer is sent.
After by host computer, switching on and shutting down order is set, then operational mode is set.Power-on command and pattern information are passed through into SCI
Communication is transmitted to controller.Operational mode includes manual mode and automatic mode.Manual mode is mainly used for commissioning test；Automatic mold
It, can be according to DC voltage, the IGBT radiator temperature and reactor of photovoltaic DC-to-AC converter after formula refers to that frequency converter receives power-on command
Temperature etc. carries out system switching machine and speed regulation automatically, and default uses automatic mode.When operational mode is selected as automatic mode or writes from memory
When recognizing, step S606 is executed, it is no to then follow the steps S612.
Step S606 obtains IGBT radiator temperature and reactor temperature.
Step S608, judges whether frequency converter compressor start up condition meets.
After controller receives switching on and shutting down order and operational mode, it can detect whether to meet compressor start up condition, predominantly detect direct current
Whether the parameters such as busbar voltage, the IGBT radiator temperature of photovoltaic DC-to-AC converter and reactor temperature, environment temperature meet booting fortune
Row index.Satisfaction enters step S610, is unsatisfactory for then carrying out cycle detection to compressor start up condition until meeting, namely return and execute step
Rapid S606 and step S608.
Step S610, determines frequency instruction.
By the IGBT radiator temperature for the photovoltaic DC-to-AC converter that communication is transmitted and reactor temperature by tabling look-up to obtain at this time
Frequency instruction.
Frequency instruction is arranged in step S612.
Step S614 calculates voltage instruction.
Voltage instruction is calculated according to frequency instruction after determining frequency instruction.
Step S616 judges whether to need to carry out voltage compensation.
S618 is thened follow the steps if necessary to compensate, otherwise directly executes step S620.
Step S618 carries out voltage compensation.
Step S620 judges whether that the number of turns is needed to convert.
It is whether equal according to blower umber of turn, judge whether to need to carry out voltage the number of turns conversion；If unequal, to electricity
Again respectively as the voltage given value of master/slave winding, i.e. execution step S622 after pressing given value to carry out umber of turn conversion；It is no
Then, directly using voltage given value as the voltage given value of master/slave winding, i.e. execution step S624.
If so, thening follow the steps S622, step S624 is otherwise directly executed.
Step S622 carries out the number of turns conversion.
Step S624 carries out master/slave winding current processing.
The calculating of main winding and auxiliary winding current effective value is carried out, and main winding current virtual value and auxiliary winding electric current are had
Valid value is sent into pi regulator after being made the difference, will be in the output compensation to voltage given value of pi regulator.
Step S626 judges whether frequency conversion speed-adjusting system is faulty.
It is no to then follow the steps S630 if not having failure to then follow the steps S628.
Step S628, PWM are enabled, drive fan operation.
S604 is returned to step after executing the step S628.
Step S630, control frequency converter are shut down.
Each technical characteristic of embodiment described above can be combined arbitrarily, for simplicity of description, not to above-mentioned reality
The all possible combinations for applying each technical characteristic in example are all described, as long as however, the combination of these technical characteristics is not present
Contradiction all should be considered as described in this specification.
The embodiments described above only express several embodiments of the present invention, and the description thereof is more specific and detailed, but simultaneously
It cannot therefore be construed as limiting the scope of the patent.It should be pointed out that coming for those of ordinary skill in the art
It says, without departing from the inventive concept of the premise, various modifications and improvements can be made, these belong to protection of the invention
Range.Therefore, the scope of protection of the patent of the invention shall be subject to the appended claims.
Claims (9)
1. a kind of fan frequency control system for converters, for the heat dissipation to the converters
Blower carries out frequency control, and the converters include power switch tube radiator and reactor；The cooling fan
For single phase ac blower；It is characterized in that, the fan frequency control system includes:
Temperature sensing circuit, for detecting the temperature and output power switch of the power switch tube radiator and the reactor
The temperature signal of tube radiator and the temperature signal of reactor；
Controller is connect with the temperature sensing circuit, for according to the power switch tube radiator temperature signal and institute
The temperature signal for stating reactor generates frequency instruction；And
Frequency converter is connect with the controller；The frequency converter is connect with DC power supply；The frequency converter is used for DC power supply
Transformation of electrical energy is carried out, generates alternating voltage that frequency is the frequency instruction to the single phase ac blower, and then described in adjusting
The revolving speed of single phase ac blower；
The single phase ac blower includes main winding and auxiliary winding；
The controller further includes voltage compensation module, voltage control module and frequency instruction module；
The voltage compensation module is connect with the frequency instruction module, for receiving the frequency instruction；The voltage compensation
Module is also used to receive the information of number of the single phase ac blower, and according to the number of the single phase ac blower and the frequency
Rate instruction generates voltage compensation value；
The voltage control module is connect with the voltage compensation module and the frequency instruction module respectively；The voltage control
Module is used to obtain corresponding voltage instruction value according to the frequency instruction, and by the voltage instruction value and the voltage compensation
Voltage given value after value addition as the main winding and the auxiliary winding.
2. fan frequency control system according to claim 1, which is characterized in that the frequency instruction module storage is
State power switch tube radiator temperature table corresponding with frequency instruction and the reactor temperature and the corresponding table of frequency instruction；The frequency
Rate instruction module is used to inquire the power switch tube radiator temperature according to the temperature signal of the power switch tube radiator
Corresponding with frequency instruction table obtains first frequency instruction, according to the temperature signal of the reactor inquire the reactor temperature with
Frequency instruction corresponds to table and obtains second frequency instruction, and using the greater in first frequency instruction and second frequency instruction as frequency
Rate instruction.
3. fan frequency control system according to claim 1, which is characterized in that further include LC filter；The LC filter
Wave device is connected between the frequency converter and the single phase ac blower.
4. fan frequency control system according to claim 2, which is characterized in that the frequency converter is that three bridge arm of two-phase is inverse
Become device；The output terminal a of the main winding, the output terminal b of the auxiliary winding, the main winding and auxiliary winding junction it is defeated
Terminal n is connected with the output terminal at three bridge arm midpoints of the two-phase three-leg inverter respectively out.
5. fan frequency control system according to claim 4, which is characterized in that further include n line current detection module；Institute
Stating controller further includes n line open circuit protection module；The n line current detection module is connected to the frequency converter and the single phase ac
Between the output terminal n of blower, for detecting the n line current when single phase ac fan operation, and the n line electricity that will test
It streams in the n line open circuit protection module；The n line open circuit protection module is used for when the single phase ac fan operation
When n line current reaches preset time continuously less than the time of pre-set current value, judge that the single phase ac blower is in n line open circuit
Malfunction controls the frequency converter and stops working and the frequency converter is forbidden to start automatically again.
6. fan frequency control system according to claim 1, which is characterized in that the controller further includes the number of turns etc.
Processing module；Not etc. the output end of the voltage control module is not arranged in processing modules to described the number of turns；The not equal processing of described the number of turns
Module is for carrying out the number of turns folding to the voltage given value when the umber of turn of the main winding and the auxiliary winding is unequal
Calculation processing, so that the amplitude for being added to the main winding and the voltage on the auxiliary winding is corresponding with the number of turns.
7. fan frequency control system according to claim 1 or 6, which is characterized in that it further include current detection circuit, institute
Current detection circuit is stated for acquiring the main winding current and auxiliary winding electric current of the single phase ac blower；The controller also wraps
Include current processing module；The current processing module according to the main winding current and the auxiliary winding electric current for being corresponded to
Main winding current virtual value and auxiliary winding current effective value；The current processing module is also used to according to the main winding current
Virtual value, the auxiliary winding current effective value generate given voltage offset and compensate to the voltage given value, so that institute
It is equal with the auxiliary winding magnetomotive force to state main winding magnetomotive force, the single phase ac blower is made to generate turned magnetic motive force.
8. fan frequency control system according to claim 2, which is characterized in that the controller includes weak magnetism speed expansion mould
Block；The weak magnetism speed expansion module is used to be higher than in the power switch tube radiator temperature or the reactor temperature corresponding
When temperature threshold, the input voltage for controlling the single phase ac blower is rated operational voltage, and controls the frequency instruction mould
Block generates the frequency instruction value for being higher than the rated operation frequency of the single phase ac blower, and the single phase ac blower is made to be higher than volume
Determine revolving speed operation.
9. fan frequency control system according to claim 2, which is characterized in that the controller further includes temperature detection
Exception processing module；The temperature abnormality detection processing module is used to receive the power switch tube heat dissipation in the controller
When the temperature signal of the temperature signal of device or the reactor has abnormal, or in the controller it can not receive the power
Switch tube radiator temperature signal or the reactor temperature signal when, control the frequency instruction module by rated frequency
Instruction output, and then control the single phase ac blower and run by rated speed.
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| CN108322079B (en) * | 2018-05-03 | 2023-10-03 | 易事特集团股份有限公司 | Five-level topological unit and five-level alternating-current-direct-current converter |
| CN109301432B (en) * | 2018-11-20 | 2020-11-03 | 中国地质调查局成都地质调查中心 | Roof satellite pot cover snow removing device |
| CN112039383B (en) * | 2019-05-14 | 2022-03-29 | 麦克维尔空调制冷(武汉)有限公司 | Motor control method, motor control device and motor system |
| CN110247424B (en) * | 2019-05-24 | 2023-04-28 | 上海电力学院 | Communication-free wind farm centralized variable frequency open loop constant voltage frequency ratio control method |
| CN110543196B (en) * | 2019-08-13 | 2021-02-12 | 华为技术有限公司 | Control method and control device for heat dissipation element |
| CN112825452A (en) * | 2019-11-19 | 2021-05-21 | 许继集团有限公司 | Thermal management control method and system for energy storage converter |
| CN111371370A (en) * | 2020-04-24 | 2020-07-03 | 王臻炜 | Intelligent single-phase alternating current motor driving system and method |
| CN113783476B (en) * | 2021-09-16 | 2024-04-05 | 深圳市海浦蒙特科技有限公司 | Single-phase motor control method, device and system |
| CN114200206B (en) * | 2021-12-07 | 2023-02-10 | 嘉兴丹那赫电子科技有限公司 | Frequency converter convenient to monitor and monitoring method thereof |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1866717A (en) * | 2005-04-28 | 2006-11-22 | 三垦电气株式会社 | Converter device |
| JP2010182572A (en) * | 2009-02-06 | 2010-08-19 | Fuji Xerox Co Ltd | Heating device, fixing device, and image forming apparatus |
| CN106871380A (en) * | 2017-03-31 | 2017-06-20 | 广东美的制冷设备有限公司 | The protective device for preventing overheat and method of power device in air-conditioner and air-conditioner |
-
2017
- 2017-07-07 CN CN201710552685.4A patent/CN107154771B/en active Active
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1866717A (en) * | 2005-04-28 | 2006-11-22 | 三垦电气株式会社 | Converter device |
| JP2010182572A (en) * | 2009-02-06 | 2010-08-19 | Fuji Xerox Co Ltd | Heating device, fixing device, and image forming apparatus |
| CN106871380A (en) * | 2017-03-31 | 2017-06-20 | 广东美的制冷设备有限公司 | The protective device for preventing overheat and method of power device in air-conditioner and air-conditioner |
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