CN103326385A - Pulverized coal feeder frequency converter control system with low voltage ride-through power supply device - Google Patents
Pulverized coal feeder frequency converter control system with low voltage ride-through power supply device Download PDFInfo
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Abstract
The invention provides a pulverized coal feeder frequency converter control system with a low voltage ride-through power supply device and relates to the field of pulverized coal feeder frequency converter control. The pulverized coal feeder frequency converter control system with the low voltage ride-through power supply device aims to solve the problems that when a pulverized coal feeder frequency converter control system encounters low system voltages, a pulverized coal feeder stops running, and changes of rotating speed, changes of torque and changes of power are caused. According to the pulverized coal feeder frequency converter control system with the low voltage ride-through power supply device, three-phase alternative current power energy passes through a second three-phase switch and a first contactor and is fed into a rectification loop formed by a first three-phase inducer and a diode rectification bridge, the three-phase alternative current power energy is transformed to direct current power energy and is stored in a first capacitor and a second capacitor, a BOOST type boost chopper circuit is formed by a second three-phase inducer and a three-phase inverter circuit, the direct current power energy on the first capacitor and the second capacitor can be transformed to direct current power energy with a higher voltage class, and the direct current power energy with the higher voltage class is stored in a third capacitor and a fourth capacitor and is fed into a frequency converter. A pre-charging loop is formed by a second contactor and three resistors of another set, and stable charging for the first capacitor, the second capacitor, the third capacitor and the forth capacitor when a voltage detecting module is powered on initially is achieved. The pulverized coal feeder frequency converter control system with the low voltage ride-through power supply device is applied to pulverized coal feeder control systems of boilers.
Description
Technical field
The present invention relates to the powder-feeder frequency control field.
Background technology
Generation current enterprise Boiler Coal Feeding machine control system mainly is comprised of frequency converter and dragging motor.The power system voltage that various faults cause falls, and can cause the pulverized coal feeder system to stop transport, and then causes generating set to shut down the abominable accident of off-grid.Process from control system analysis pulverized coal feeder system stops transport has two reasons can bring out this problem: transducer power loop and control power supply.The loop of power circuit of frequency converter forms by rectification module, DC link, inversion module, as shown in Figure 1.Current enter (R/L1, S/L2, T/L3) of frequency converter to direct current DC, passes through inversion (TM4, TM5, TM6) to U/T1 through rectification (TM1, TM2, TM3) again, V/T2, and W/T3 exchanges, and realizes frequency translation.When low-voltage occurs, R/L1, S/L2, T/L3 voltage step-down, DC bus-bar voltage decreases, and can't provide inversion module needed energy, triggers the frequency converter protection; This protection is the built-in hardware protection of frequency converter, can't evade by revising definite value.
In addition, the control power supply power-fail also can cause the stoppage in transit of frequency convertor system.
In the pulverized coal feeder system, the operation of frequency converter is to be mated work by control circuit board, sampling feedback system, relay and contactor, and these parts all need stable control Power supply.During electric power system generation low voltage failure, the control power supply also can fall, and then causes the paralysis of control system and relay system, and frequency converter can't normally move equally, and the pulverized coal feeder system stops transport.
By as above analyzing as can be known; operating frequency converter can stop output when system voltage falls temporarily; and send the frequency converter stopping signal to unit DCS; finally make the MFT action cause the unit blowing out; for addressing this problem; by the debugging frequency converter; dropped into the decompression restart facility; after being contemplated for the system voltage recovery; frequency convertor system restart fast this problem that solves; yet correlation test is the result show: frequency converter all can start successfully behind dead electricity 2s usually; but by the boiler combustion test that many pulverized coal feeders while dead electricity are restarted; find that the combustion chamber draft fluctuation is larger, affect boiler operatiopn safety, should not take the method to solve the low voltage crossing problem of pulverized coal feeder system.
Summary of the invention
The present invention is in order to solve the pulverized coal feeder system when system low-voltage occurs, and pulverized coal feeder is stopped transport, the problem that causes rotating speed, torque, power to change, thus a kind of powder-feeder frequency control system with low voltage crossing supply unit is provided.
Powder-feeder frequency control system with low voltage crossing supply unit, it comprises the first two-phase switch, the first threephase switch, the second threephase switch, the first three pole reactor, the second three pole reactor, the first contactor, the second contactor, transformer, diode rectifier bridge, three-phase inverting circuit, the first voltage detection module, the second voltage detection module, the tertiary voltage detection module, the 4th voltage detection module, the 5th voltage detection module, the first electric capacity, the second electric capacity, the 3rd electric capacity, the 4th electric capacity, a plurality of unit and 6 resistance
Described 6 resistance are divided into two groups, every group of 3 resistance,
The structure of a plurality of unit is identical, and each unit comprises the first diode, the second diode, the second two-phase switch, frequency converter and motor;
The three-phase input end of described the first threephase switch connects three phase mains, the three-phase output end of the first threephase switch respectively 3 resistance by first group is connected with the earth, two inputs of the first two-phase switch are connected with any two phase output terminals in the three-phase output end of the first threephase switch respectively, two outputs of described the first two-phase switch are connected with the two ends of the former limit winding of transformer respectively, the two ends of the secondary winding of transformer are connected with electrical network, the three-phase input end of described the second threephase switch is connected with three phase mains, the three-phase output end of this second threephase switch respectively with the first voltage detection signal input of the first voltage detection module, the first voltage detection signal input of second voltage detection module is connected the first voltage detection signal input and is connected with the tertiary voltage detection module, the first voltage detection signal input of described the first voltage detection module also is connected with the second voltage detection signal input of tertiary voltage detection module, the second voltage detection signal input of the first voltage detection module is connected with the first voltage detection signal input of second voltage detection module, the second voltage detection signal input of second voltage detection module is connected with the first voltage detection signal input of tertiary voltage detection module, the input of the threephase switch of described the first contactor be connected the input of threephase switch of contactor and be connected with the three-phase output end of the second threephase switch simultaneously, the output of the threephase switch of described the second contactor respectively 3 resistance by second group and the threephase switch of the first contactor output be connected the three-phase input end of three pole reactor and be connected, the three-phase output end of described the first three pole reactor is connected with the three-phase input end of diode rectifier bridge, the anodal while of the dc output end of described diode rectifier bridge and an end of the first electric capacity, the first voltage detection signal input of the three-phase input end of the second three pole reactor and the 4th voltage detection module connects, the negative pole while of the dc output end of this diode rectifier bridge and an end of the second electric capacity, the second voltage detection signal input of the 4th voltage detection module is connected the common port of lower brachium pontis and is connected with three-phase inverting circuit, the other end of described the first electric capacity is connected with the other end of the second electric capacity, the three-phase output end of described the second three pole reactor is connected with the three-phase input end of three-phase inverting circuit respectively, the common port while of the upper brachium pontis of described three-phase inverting circuit and an end of the 3rd electric capacity, the first voltage detection signal input of the 5th voltage detection module is connected an end and is connected with the unit
The common port of the lower brachium pontis of described three-phase inverting circuit also simultaneously is connected the other end with the second voltage detection signal input of an end of the 4th electric capacity, the 5th voltage detection module and is connected with the unit,
The other end of described the 3rd electric capacity is connected with the other end of the 4th electric capacity,
Two inputs of the second two-phase switch in each unit are connected with the negative pole of the first diode, the positive pole of the second diode respectively, two signal output parts of described the second two-phase switch are connected with the two-phase driving signal input of frequency converter, the three-phase driving signal output of described frequency converter is connected with the driving signal input of motor
One end of described unit is the positive pole of the first diode, and the other end of described unit is the negative pole of the second diode.
When the powder-feeder frequency control system with low voltage crossing supply unit is normally moved, threephase AC electric energy is sent into the commutating circuit that is made of the first three pole reactor and diode rectifier bridge through the second threephase switch, the first contactor, be transformed to direct current energy and be stored in the first electric capacity and the second electric capacity, the second three pole reactor and three-phase inverting circuit consist of the boost chopper of BOOST pattern, direct current energy on the first electric capacity and the second electric capacity can be transformed to the higher direct current energy of electric pressure and be stored in the 3rd electric capacity and the 4th electric capacity, and send into frequency converter.3 resistance of the second contactor and second group consist of the precharge loops, realize being the steady charging of the first electric capacity, the second electric capacity, the 3rd electric capacity and the 4th electric capacity when 5 voltage detection module initially power on.
When having the powder-feeder frequency control system operation of low voltage crossing supply unit, the second threephase switch, the first contactor all are in closure state, and the second contactor disconnects after finishing pre-charging functions, and is out of service.Under the normal state of system voltage, the original 380V by frequency converter exchanges and send electricity to motor, and the power electronic device that has in the powder-feeder frequency control system of low voltage crossing supply unit all is in bypass condition, does not participate in operation.When system voltage falls, when causing direct voltage on the first electric capacity and the second electric capacity to fall, the built-in control system of the 4th voltage detection module real-time monitors this voltage and falls trend, the boost chopper of the BOOST pattern that the second three pole reactor and diode rectifier bridge are consisted of puts into operation fast, guarantee during three-phase mains voltage is fallen, direct voltage on the 3rd electric capacity and the 4th electric capacity is raised, and is maintained to guarantee all constant voltage levvls of power converter output, motor torque, motor speed.
Fall end at system voltage, after system voltage recovered normally, three-phase inverting circuit was out of service, and the power supply of frequency converter still send electric loop to provide by three-phase alternating current.
Interchange send electric channel and direct current to send the switching of electric channel to be finished by three-phase inverting circuit, and the change action time is seamless switching less than 1us, can not impact the stable operation of frequency converter.
The present invention adopts the DC support technology, namely adds the low-voltage span ability that uninterrupted DC power supply improves frequency converter in the frequency converter DC side, solves present factory and exists because of voltage collapse (rolling electricity), causes the hidden danger of frequency converter under-voltage protection tripping operation.
The beneficial effect that the present invention brings is, realized the pulverized coal feeder system when system low-voltage occurs, and pulverized coal feeder is not shut down, and rotating speed, torque and power all remain unchanged; Can protect DC equipment not damaged by voltage dip, have the response speed that is exceedingly fast to being low to moderate 40% three-phase voltage sag in the AC network and cutting off the power supply.
Description of drawings
Fig. 1 is that the loop of power circuit of frequency converter forms structural representation; Wherein, Reference numeral 7 expression rectification modules, Reference numeral 8 expression inversion modules.
Fig. 2 for take 6 unit as example the time, the electrical structure schematic diagram with powder-feeder frequency control system of low voltage crossing supply unit of the present invention.
Embodiment
Embodiment one: present embodiment is described referring to Fig. 2, the described powder-feeder frequency control system with low voltage crossing supply unit of present embodiment, it comprises the first two-phase K switch 3, the first threephase switch K1, the second threephase switch K2, the first three pole reactor L1, the second three pole reactor L2, the first contactor KM1, the second contactor KM2, transformer, diode rectifier bridge 2, three-phase inverting circuit 3, the first voltage detection module 1-1, second voltage detection module 1-2, tertiary voltage detection module 1-3, the 4th voltage detection module 1-4, the 5th voltage detection module 1-5, the first capacitor C 1, the second capacitor C 2, the 3rd capacitor C 3, the 4th capacitor C 4, a plurality of unit and 6 resistance
Described 6 resistance are divided into two groups, every group of 3 resistance,
The structure of a plurality of unit is identical, and each unit comprises the first diode, the second diode, the second two-phase K switch 4, frequency converter 4 and motor M;
The three-phase input end of described the first threephase switch K1 connects three phase mains, the three-phase output end of the first threephase switch K1 respectively 3 resistance by first group is connected with the earth, two inputs of the first two-phase K switch 3 are connected with any two phase output terminals in the three-phase output end of the first threephase switch K1 respectively, two outputs of described the first two-phase K switch 3 are connected with the two ends of the former limit winding of transformer respectively, the two ends of the secondary winding of transformer are connected with electrical network, the three-phase input end of described the second threephase switch K2 is connected with three phase mains, the three-phase output end of this second threephase switch K2 respectively with the first voltage detection signal input of the first voltage detection module 1-1, the first voltage detection signal input of second voltage detection module 1-2 is connected the first voltage detection signal input and is connected with tertiary voltage detection module 1-3, the first voltage detection signal input of described the first voltage detection module 1-1 also is connected with the second voltage detection signal input of tertiary voltage detection module 1-3, the second voltage detection signal input of the first voltage detection module 1-1 is connected with the first voltage detection signal input of second voltage detection module 1-2, the second voltage detection signal input of second voltage detection module 1-2 is connected with the first voltage detection signal input of tertiary voltage detection module 1-3, the input of the threephase switch of described the first contactor KM1 be connected the input of threephase switch of contactor KM2 and be connected with the three-phase output end of the second threephase switch K2 simultaneously, the output of the threephase switch of described the second contactor KM2 respectively 3 resistance by second group and the threephase switch of the first contactor KM1 output be connected the three-phase input end of three pole reactor L1 and be connected, the three-phase output end of described the first three pole reactor L1 is connected with the three-phase input end of diode rectifier bridge 2, the anodal while of the dc output end of described diode rectifier bridge 2 and an end of the first capacitor C 1, the first voltage detection signal input of the three-phase input end of the second three pole reactor L2 and the 4th voltage detection module 1-4 connects, the negative pole while of the dc output end of this diode rectifier bridge 2 and an end of the second capacitor C 2, the common port of the lower brachium pontis that the second voltage detection signal input of the 4th voltage detection module 1-4 is connected with three-phase inverting circuit connects, the other end of described the first capacitor C 1 is connected with the other end of the second capacitor C 2, the three-phase output end of described the second three pole reactor L2 is connected with the three-phase input end of three-phase inverting circuit 3 respectively, the common port while of the upper brachium pontis of described three-phase inverting circuit 3 and an end of the 3rd capacitor C 3, the first voltage detection signal input of the 5th voltage detection module 1-5 is connected an end and is connected with the unit
The common port of the lower brachium pontis of described three-phase inverting circuit 3 also simultaneously is connected the other end with the second voltage detection signal input of an end of the 4th capacitor C 4, the 5th voltage detection module 1-5 and is connected with the unit,
The other end of described the 3rd capacitor C 3 is connected with the other end of the 4th capacitor C 4,
Two inputs of the second two-phase K switch 4 in each unit are connected with the negative pole of the first diode, the positive pole of the second diode respectively, two signal output parts of described the second two-phase K switch 4 are connected with the two-phase driving signal input of frequency converter 4, the three-phase driving signal output of described frequency converter 4 is connected with the driving signal input of motor M
One end of described unit is the positive pole of the first diode, and the other end of described unit is the negative pole of the second diode.
Embodiment two: present embodiment is described referring to Fig. 2, present embodiment and embodiment one described difference with powder-feeder frequency control system of low voltage crossing supply unit be, the number of described a plurality of unit is less than or equal to 12 more than or equal to 2.
Embodiment three: present embodiment is described referring to Fig. 2, present embodiment and embodiment one described difference with powder-feeder frequency control system of low voltage crossing supply unit be, the structure of described the first voltage detection module 1-1, second voltage detection module 1-2, tertiary voltage detection module 1-3, the 4th voltage detection module 1-4 and the 5th voltage detection module 1-5 is identical.
Embodiment four: present embodiment is described referring to Fig. 2, present embodiment and embodiment one described difference with powder-feeder frequency control system of low voltage crossing supply unit be, the appearance value of described the first capacitor C 1, the second capacitor C 2, the 3rd capacitor C 3 and the 4th capacitor C 4 is identical.
Embodiment five: present embodiment is described referring to Fig. 2, present embodiment and embodiment one described difference with powder-feeder frequency control system of low voltage crossing supply unit be, described the first contactor KM1 and the second contactor KM2 are the three-phase ac contactor of same model.
Embodiment six: present embodiment is described referring to Fig. 2, present embodiment and embodiment one described difference with powder-feeder frequency control system of low voltage crossing supply unit be, described the first threephase switch K1 and the second threephase switch K2 are the threephase switch of same model.
Embodiment seven: present embodiment is described referring to Fig. 2, present embodiment and embodiment one described difference with powder-feeder frequency control system of low voltage crossing supply unit be, described the first two-phase K switch 3 and the second two-phase K switch 4 are the two-phase switch of same model.
Embodiment eight: present embodiment is described referring to Fig. 2, present embodiment and embodiment one described difference with powder-feeder frequency control system of low voltage crossing supply unit be, described the first diode and the second diode are the diode of same model.
Embodiment nine: present embodiment is described referring to Fig. 2, present embodiment and embodiment one described difference with powder-feeder frequency control system of low voltage crossing supply unit be, described the first three pole reactor L1 and the second three pole reactor L2 are the three pole reactor of same model.
Claims (9)
1. the powder-feeder frequency control system that has the low voltage crossing supply unit, it is characterized in that, it comprises the first two-phase switch (K3), the first threephase switch (K1), the second threephase switch (K2), the first three pole reactor (L1), the second three pole reactor (L2), the first contactor (KM1), the second contactor (KM2), transformer, diode rectifier bridge (2), three-phase inverting circuit (3), the first voltage detection module (1-1), second voltage detection module (1-2), tertiary voltage detection module (1-3), the 4th voltage detection module (1-4), the 5th voltage detection module (1-5), the first electric capacity (C1), the second electric capacity (C2), the 3rd electric capacity (C3), the 4th electric capacity (C4), a plurality of unit and 6 resistance
Described 6 resistance are divided into two groups, every group of 3 resistance,
The structure of a plurality of unit is identical, and each unit comprises the first diode, the second diode, the second two-phase switch (K4), frequency converter (4) and motor (M);
The three-phase input end of described the first threephase switch (K1) connects three phase mains, the three-phase output end of the first threephase switch (K1) respectively 3 resistance by first group is connected with the earth, two inputs of the first two-phase switch (K3) are connected with any two phase output terminals in the three-phase output end of the first threephase switch (K1) respectively, two outputs of described the first two-phase switch (K3) are connected with the two ends of the former limit winding of transformer respectively, the two ends of the secondary winding of transformer are connected with electrical network, the three-phase input end of described the second threephase switch (K2) is connected with three phase mains, the three-phase output end of this second threephase switch (K2) respectively with the first voltage detection signal input of the first voltage detection module (1-1), the first voltage detection signal input of second voltage detection module (1-2) is connected 1-3 with the tertiary voltage detection module) the first voltage detection signal input connect, the first voltage detection signal input of described the first voltage detection module (1-1) also is connected with the second voltage detection signal input of tertiary voltage detection module (1-3), the second voltage detection signal input of the first voltage detection module (1-1) is connected with the first voltage detection signal input of second voltage detection module (1-2), the second voltage detection signal input of second voltage detection module (1-2) is connected with the first voltage detection signal input of tertiary voltage detection module (1-3), the input of the threephase switch of described the first contactor (KM1) be connected the input of threephase switch of contactor (KM2) and be connected with the three-phase output end of the second threephase switch (K2) simultaneously, the output of the threephase switch of described the second contactor (KM2) respectively 3 resistance by second group and the threephase switch of the first contactor (KM1) output be connected the three-phase input end of three pole reactor (L1) and be connected, the three-phase output end of described the first three pole reactor (L1) is connected with the three-phase input end of diode rectifier bridge (2), the anodal while of the dc output end of described diode rectifier bridge (2) and an end of the first electric capacity (C1), the first voltage detection signal input of the three-phase input end of the second three pole reactor (L2) and the 4th voltage detection module (1-4) connects, the negative pole while of the dc output end of this diode rectifier bridge (2) and an end of the second electric capacity (C2), the second voltage detection signal input of the 4th voltage detection module (1-4) is connected 3 with three-phase inverting circuit) the common port of lower brachium pontis connect, the other end of described the first electric capacity (C1) is connected with the other end of the second electric capacity (C2), the three-phase output end of described the second three pole reactor (L2) is connected with the three-phase input end of three-phase inverting circuit (3) respectively, the common port while of the upper brachium pontis of described three-phase inverting circuit (3) and an end of the 3rd electric capacity (C3), the first voltage detection signal input of the 5th voltage detection module (1-5) is connected an end and is connected with the unit
The common port of the lower brachium pontis of described three-phase inverting circuit (3) also simultaneously is connected the other end with the second voltage detection signal input of an end of the 4th electric capacity (C4), the 5th voltage detection module (1-5) and is connected with the unit,
The other end of described the 3rd electric capacity (C3) is connected with the other end of the 4th electric capacity (C4),
Two inputs of the second two-phase switch (K4) in each unit are connected with the negative pole of the first diode, the positive pole of the second diode respectively, two signal output parts of described the second two-phase switch (K4) are connected with the two-phase driving signal input of frequency converter (4), the three-phase driving signal output of described frequency converter (4) is connected with the driving signal input of motor (M)
One end of described unit is the positive pole of the first diode, and the other end of described unit is the negative pole of the second diode.
2. the powder-feeder frequency control system with low voltage crossing supply unit according to claim 1 is characterized in that, the number of described a plurality of unit is less than or equal to 12 more than or equal to 2.
3. the powder-feeder frequency control system with low voltage crossing supply unit according to claim 1, it is characterized in that, the structure of described the first voltage detection module (1-1), second voltage detection module (1-2), tertiary voltage detection module (1-3), the 4th voltage detection module (1-4) and the 5th voltage detection module (1-5) is identical.
4. the powder-feeder frequency control system with low voltage crossing supply unit according to claim 1 is characterized in that, the appearance value of described the first electric capacity (C1), the second electric capacity (C2), the 3rd electric capacity (C3) and the 4th electric capacity (C4) is identical.
5. the powder-feeder frequency control system with low voltage crossing supply unit according to claim 1 is characterized in that, described the first contactor (KM1) and the second contactor (KM2) are the three-phase ac contactor of same model.
6. the powder-feeder frequency control system with low voltage crossing supply unit according to claim 1 is characterized in that, described the first threephase switch (K1) and the second threephase switch (K2) are the threephase switch of same model.
7. the powder-feeder frequency control system with low voltage crossing supply unit according to claim 1 is characterized in that, described the first two-phase switch (K3) and the second two-phase switch (K4) are the two-phase switch of same model.
8. the powder-feeder frequency control system with low voltage crossing supply unit according to claim 1 is characterized in that, described the first diode and the second diode are the diode of same model.
9. the powder-feeder frequency control system with low voltage crossing supply unit according to claim 1 is characterized in that, described the first three pole reactor (L1) and the second three pole reactor (L2) are the three pole reactor of same model.
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| CN103545913B (en) * | 2013-10-25 | 2016-04-20 | 国家电网公司 | The thermal power plant frequency converter low voltage ride through device of interchange, direct current input double copies |
| CN103762865A (en) * | 2014-01-13 | 2014-04-30 | 邯郸派瑞节能控制技术有限公司 | Low-voltage ride-through power source for frequency converter |
| CN103762865B (en) * | 2014-01-13 | 2015-11-18 | 邯郸派瑞节能控制技术有限公司 | Low-voltage ride-through power source for frequency converter |
| CN103997198A (en) * | 2014-05-09 | 2014-08-20 | 广东美的暖通设备有限公司 | Voltage short interruption noise immunity promoting circuit of transducer and transducer |
| CN103997198B (en) * | 2014-05-09 | 2017-01-04 | 广东美的暖通设备有限公司 | The short time voltage of converter is interrupted immunity to interference and is promoted circuit and converter |
| CN104578154A (en) * | 2014-12-26 | 2015-04-29 | 上海新拓电力设备有限公司 | Low voltage ride-through method for coal feeder |
| CN109633305A (en) * | 2018-12-12 | 2019-04-16 | 盐田国际集装箱码头有限公司 | A kind of frequency converter failure processing method and frequency converter failure processing platform |
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| CN103326385B (en) | 2015-01-14 |
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