CN103326385B - 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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- CN103326385B CN103326385B CN201310253488.4A CN201310253488A CN103326385B CN 103326385 B CN103326385 B CN 103326385B CN 201310253488 A CN201310253488 A CN 201310253488A CN 103326385 B CN103326385 B CN 103326385B
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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 powder-feeder frequency control field.
Background technology
Generation current enterprise Boiler Coal Feeding machine control system is primarily of frequency converter and dragging motor composition.The power system voltage that various fault causes falls, and can cause pulverized coal feeder system shutdown, and then causes generating set to shut down the severe accident of off-grid.From the process of control system analysis pulverized coal feeder system shutdown, there are 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, through rectification (TM1, TM2, TM3) to direct current DC, then exchanges to U/T1, V/T2, W/T3 through inversion (TM4, TM5, TM6), realizes frequency translation.When low-voltage occurs, R/L1, S/L2, T/L3 voltage step-down, DC bus-bar voltage decreases, and cannot provide the energy required for inversion module, triggers frequency converter protection; This protects as the built-in hardware protection of frequency converter, cannot be evaded by amendment definite value.
In addition, the stoppage in transit that power supply power-fail also can cause frequency convertor system is controlled.
In pulverized coal feeder system, the operation of frequency converter is 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, control power supply and also can fall, and then cause the paralysis of control system and relay system, frequency converter cannot normally run equally, pulverized coal feeder system shutdown.
From as above analyzing, operating frequency converter can stop when system voltage falls temporarily exporting, and send frequency converter stopping signal to unit DCS, MFT action is finally made to cause unit blowing out, for addressing this problem, by debugging frequency converter, drop into decompression restart facility, after being contemplated for system voltage recovery, restarting fast of frequency convertor system solves this problem, but correlation test result shows: frequency converter all can start successfully after dead electricity 2s usually, but by the boiler combustion test to restarting after power-loss while of multiple stage pulverized coal feeder, find that furnace pressure fluctuation is larger, affect boiler operatiopn safety, the method should not be taked to solve the low voltage crossing problem of pulverized coal feeder system.
Summary of the invention
The present invention is in order to solve pulverized coal feeder system when system low-voltage occurs, pulverized coal feeder is stopped transport, and causes the problem that rotating speed, torque, power change, thus provides a kind of powder-feeder frequency control system with low-voltage ride-through power source device.
There is the powder-feeder frequency control system of low-voltage ride-through power source device, 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, 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, multiple unit and 6 resistance
6 described resistance are divided into two groups, often organize 3 resistance,
The structure of multiple 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 the first described threephase switch connects three phase mains, the three-phase output end of the first threephase switch is connected with the earth respectively by 3 resistance of first group, 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 the first described two-phase switch are connected with the two ends of the former limit winding of transformer respectively, the two ends of the vice-side winding of transformer are connected with electrical network, the three-phase input end of the second described 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, first voltage detection signal input of the second voltage detection module is connected with the first voltage detection signal input of tertiary voltage detection module, first voltage detection signal input of the first described voltage detection module is also connected with the second voltage detection signal input of tertiary voltage detection module, second voltage detection signal input of the first voltage detection module is connected with the first voltage detection signal input of the second voltage detection module, second voltage detection signal input of the 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 first contactor is connected with the three-phase output end of the second threephase switch with the input of the threephase switch of the second contactor simultaneously, the output of the threephase switch of the second described contactor is connected with the output of the threephase switch of the first contactor and the three-phase input end of the first three pole reactor respectively by 3 resistance of second group, the described three-phase output end of the first three pole reactor is connected with the three-phase input end of diode rectifier bridge, the positive pole of the DC output end of described diode rectifier bridge simultaneously with one end of the first electric capacity, the three-phase input end of the second three pole reactor is connected with the first voltage detection signal input of the 4th voltage detection module, the negative pole of the DC output end of this diode rectifier bridge simultaneously with one end of the second electric capacity, second voltage detection signal input of the 4th voltage detection module is connected with the common port of the lower brachium pontis of three-phase inverting circuit, the other end of the first described electric capacity is connected with the other end of the second electric capacity, the three-phase output end of the second described three pole reactor is connected with the three-phase input end of three-phase inverting circuit respectively, the common port of the upper brachium pontis of described three-phase inverting circuit simultaneously with one end of the 3rd electric capacity, first voltage detection signal input of the 5th voltage detection module is connected with one end of unit
The common port of the lower brachium pontis of described three-phase inverting circuit is also connected with the other end of one end of the 4th electric capacity, the second voltage detection signal input of the 5th voltage detection module and unit simultaneously,
The other end of the 3rd described 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 the second described two-phase switch are connected with the two-phase-region casting signal input part 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 ride-through power source device is normally run, threephase AC electric energy sends into through the second threephase switch, the first contactor the commutating circuit be made up of the first three pole reactor and diode rectifier bridge, be transformed to direct current energy and be stored in the first electric capacity and the second electric capacity, second three pole reactor and three-phase inverting circuit form the boost chopper of BOOST pattern, direct current energy on 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 form precharge loop, and realizing when 5 voltage detection module initially power on, is the steady charging of the first electric capacity, the second electric capacity, the 3rd electric capacity and the 4th electric capacity.
When having the powder-feeder frequency control system operation of low-voltage ride-through power source device, the second threephase switch, the first contactor are all in closure state, and the second contactor disconnects after completing pre-charging functions, out of service.Under the normal state of system voltage, exchange power transmission to motor by original 380V of frequency converter, the power electronic device had in the powder-feeder frequency control system of low-voltage ride-through power source device is all in bypass condition, does not participate in running.When system voltage falls, when causing the direct voltage on the first electric capacity and the second electric capacity to fall, the built-in control system of 4th voltage detection module real-time monitors this Voltage Drop trend, the boost chopper of the BOOST pattern the second three pole reactor and diode rectifier bridge formed puts into operation fast, ensure to fall period in three-phase mains voltage, direct voltage on 3rd electric capacity and the 4th electric capacity is raised, and is maintained to the voltage levvl that can ensure that power converter output, motor torque, motor speed are all constant.
Fall end at system voltage, system voltage recovers normally, and three-phase inverting circuit is out of service, and the power supply of frequency converter is still provided by three-phase alternating current power transmission loop.
The switching exchanging power transmission passage and direct current power transmission passage is completed by three-phase inverting circuit, and the switching action time is less than 1us, is seamless switching, can not impact the stable operation of frequency converter.
The present invention adopts DC support technology, namely adds in frequency converter DC side the low-voltage span ability that uninterrupted DC power supply improves frequency converter, solves current factory and exists because of voltage collapse (shaking electric), cause the hidden danger that frequency converter under-voltage protection is tripped.
The beneficial effect that the present invention brings is, achieve pulverized coal feeder system when system low-voltage occurs, pulverized coal feeder is not shut down, and rotating speed, torque and power all remain unchanged; DC equipment can be protected not damage by voltage dip, to the three-phase voltage sag and power-off being low to moderate 40% in AC network, there is the response speed be exceedingly fast.
Accompanying drawing explanation
Fig. 1 is the loop of power circuit composition structural representation of frequency converter; Wherein, Reference numeral 7 represents rectification module, and Reference numeral 8 represents inversion module.
When Fig. 2 is for 6 unit, the electrical structure schematic diagram with the powder-feeder frequency control system of low-voltage ride-through power source device of the present invention.
Embodiment
Embodiment one: present embodiment is described see Fig. 2, the powder-feeder frequency control system with low-voltage ride-through power source device described in present embodiment, it comprises the first two-phase K switch 3, first threephase switch K1, second threephase switch K2, first three pole reactor L1, second three pole reactor L2, first contactor KM1, second contactor KM2, transformer, diode rectifier bridge 2, three-phase inverting circuit 3, first voltage detection module 1-1, second voltage detection module 1-2, tertiary voltage detection module 1-3, 4th voltage detection module 1-4, 5th voltage detection module 1-5, first electric capacity C1, second electric capacity C2, 3rd electric capacity C3, 4th electric capacity C4, multiple unit and 6 resistance,
6 described resistance are divided into two groups, often organize 3 resistance,
The structure of multiple 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 the first described threephase switch K1 connects three phase mains, the three-phase output end of the first threephase switch K1 is connected with the earth respectively by 3 resistance of first group, 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 the first described two-phase K switch 3 are connected with the two ends of the former limit winding of transformer respectively, the two ends of the vice-side winding of transformer are connected with electrical network, the three-phase input end of the second described 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 the second voltage detection module 1-2 is connected with the first voltage detection signal input of tertiary voltage detection module 1-3, the first voltage detection signal input of the first described voltage detection module 1-1 is also 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 the second voltage detection module 1-2, the second voltage detection signal input of the 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 first contactor KM1 is connected with the three-phase output end of the second threephase switch K2 with the input of the threephase switch of the second contactor KM2 simultaneously, the output of the threephase switch of the second described contactor KM2 is connected respectively by the three-phase input end of 3 resistance of second group with the output of the threephase switch of the first contactor KM1 and the first three pole reactor L1, the three-phase output end of the first described three pole reactor L1 is connected with the three-phase input end of diode rectifier bridge 2, the positive pole of the DC output end of described diode rectifier bridge 2 simultaneously with one end of the first electric capacity C1, the three-phase input end of the second three pole reactor L2 is connected with the first voltage detection signal input of the 4th voltage detection module 1-4, the negative pole of the DC output end of this diode rectifier bridge 2 simultaneously with one end of the second electric capacity C2, the second voltage detection signal input of the 4th voltage detection module 1-4 is connected with the common port of the lower brachium pontis of three-phase inverting circuit 3, the other end of the first described electric capacity C1 is connected with the other end of the second electric capacity C2, the three-phase output end of the second described three pole reactor L2 is connected with the three-phase input end of three-phase inverting circuit 3 respectively, the common port of the upper brachium pontis of described three-phase inverting circuit 3 simultaneously with one end of the 3rd electric capacity C3, the first voltage detection signal input of the 5th voltage detection module 1-5 is connected with one end of unit
The common port of the lower brachium pontis of described three-phase inverting circuit 3 is also connected with the other end of one end of the 4th electric capacity C4, the second voltage detection signal input of the 5th voltage detection module 1-5 and unit simultaneously,
The other end of the 3rd described electric capacity C3 is connected with the other end of the 4th electric capacity C4,
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 the second described two-phase K switch 4 are connected with the two-phase-region casting signal input part 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 see Fig. 2, present embodiment and the difference with the powder-feeder frequency control system of low-voltage ride-through power source device described in embodiment one are, the number of described multiple unit is less than or equal to 12 for being more than or equal to 2.
Embodiment three: present embodiment is described see Fig. 2, present embodiment and the difference with the powder-feeder frequency control system of low-voltage ride-through power source device described in embodiment one are, the first described voltage detection module 1-1, the second voltage detection module 1-2, tertiary voltage detection module 1-3, the 4th voltage detection module 1-4 are identical with the structure of the 5th voltage detection module 1-5.
Embodiment four: present embodiment is described see Fig. 2, present embodiment and the difference with the powder-feeder frequency control system of low-voltage ride-through power source device described in embodiment one are, the first described electric capacity C1, the second electric capacity C2, the 3rd electric capacity C3 are identical with the capacitance of the 4th electric capacity C4.
Embodiment five: present embodiment is described see Fig. 2, present embodiment and the difference with the powder-feeder frequency control system of low-voltage ride-through power source device described in embodiment one are, the first described contactor KM1 and the second contactor KM2 is the three-phase ac contactor of same model.
Embodiment six: present embodiment is described see Fig. 2, present embodiment and the difference with the powder-feeder frequency control system of low-voltage ride-through power source device described in embodiment one are, the first described threephase switch K1 and the second threephase switch K2 is the threephase switch of same model.
Embodiment seven: present embodiment is described see Fig. 2, present embodiment and the difference with the powder-feeder frequency control system of low-voltage ride-through power source device described in embodiment one are, the first described 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 see Fig. 2, present embodiment and the difference with the powder-feeder frequency control system of low-voltage ride-through power source device described in embodiment one are, the first described diode and the second diode are the diode of same model.
Embodiment nine: present embodiment is described see Fig. 2, present embodiment and the difference with the powder-feeder frequency control system of low-voltage ride-through power source device described in embodiment one are, the first described three pole reactor L1 and the second three pole reactor L2 is the three pole reactor of same model.
Claims (8)
1. there is the powder-feeder frequency control system of low-voltage ride-through power source device, it is characterized in that, it comprises the first two-phase switch (K3), first threephase switch (K1), second threephase switch (K2), first three pole reactor (L1), second three pole reactor (L2), first contactor (KM1), second contactor (KM2), transformer, diode rectifier bridge (2), three-phase inverting circuit (3), first voltage detection module (1-1), second voltage detection module (1-2), tertiary voltage detection module (1-3), 4th voltage detection module (1-4), 5th voltage detection module (1-5), first electric capacity (C1), second electric capacity (C2), 3rd electric capacity (C3), 4th electric capacity (C4), multiple unit and 6 resistance,
6 described resistance are divided into two groups, often organize 3 resistance,
The structure of multiple 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) is connected with the earth respectively by 3 resistance of first group, 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 the first described two-phase switch (K3) are connected with the two ends of the former limit winding of transformer respectively, the two ends of the vice-side 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), first voltage detection signal input of the second voltage detection module (1-2) is connected with the first voltage detection signal input of tertiary voltage detection module (1-3), first voltage detection signal input of described the first voltage detection module (1-1) is also connected with the second voltage detection signal input of tertiary voltage detection module (1-3), second voltage detection signal input of the first voltage detection module (1-1) is connected with the first voltage detection signal input of the second voltage detection module (1-2), second voltage detection signal input of the 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 first contactor (KM1) is connected with the three-phase output end of the second threephase switch (K2) with the input of the threephase switch of the second contactor (KM2) simultaneously, the output of the threephase switch of described the second contactor (KM2) is connected respectively by the three-phase input end of 3 resistance of second group with the output of the threephase switch of the first contactor (KM1) and the first three pole reactor (L1), 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 positive pole of the DC output end of described diode rectifier bridge (2) simultaneously with one end of the first electric capacity (C1), the three-phase input end of the second three pole reactor (L2) is connected with the first voltage detection signal input of the 4th voltage detection module (1-4), the negative pole of the DC output end of this diode rectifier bridge (2) simultaneously with one end of the second electric capacity (C2), second voltage detection signal input of the 4th voltage detection module (1-4) is connected with the common port of the lower brachium pontis of three-phase inverting circuit (3), 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 of the upper brachium pontis of described three-phase inverting circuit (3) simultaneously with one end of the 3rd electric capacity (C3), first voltage detection signal input of the 5th voltage detection module (1-5) is connected with one end of unit
The common port of the lower brachium pontis of described three-phase inverting circuit (3) is also connected with one end of the 4th electric capacity (C4), the second voltage detection signal input of the 5th voltage detection module (1-5) and the other end of unit simultaneously,
The other end of the 3rd described 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 the second described two-phase switch (K4) are connected with the two-phase-region casting signal input part 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 ride-through power source device according to claim 1, it is characterized in that, described the first voltage detection module (1-1), the second voltage detection module (1-2), tertiary voltage detection module (1-3), the 4th voltage detection module (1-4) are identical with the structure of the 5th voltage detection module (1-5).
3. the powder-feeder frequency control system with low-voltage ride-through power source device according to claim 1, it is characterized in that, described the first electric capacity (C1), the second electric capacity (C2), the 3rd electric capacity (C3) are identical with the capacitance of the 4th electric capacity (C4).
4. the powder-feeder frequency control system with low-voltage ride-through power source device according to claim 1, is characterized in that, the three-phase ac contactor that described the first contactor (KM1) and the second contactor (KM2) are same model.
5. the powder-feeder frequency control system with low-voltage ride-through power source device according to claim 1, is characterized in that, the threephase switch that described the first threephase switch (K1) and the second threephase switch (K2) are same model.
6. the powder-feeder frequency control system with low-voltage ride-through power source device according to claim 1, is characterized in that, the two-phase switch that the first described two-phase switch (K3) and the second two-phase switch (K4) are same model.
7. the powder-feeder frequency control system with low-voltage ride-through power source device according to claim 1, is characterized in that, the first described diode and the second diode are the diode of same model.
8. the powder-feeder frequency control system with low-voltage ride-through power source device according to claim 1, is characterized in that, the three pole reactor that described the first three pole reactor (L1) and the second three pole reactor (L2) are same model.
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| CN105871295B (en) * | 2016-05-11 | 2019-04-02 | 安徽立卓智能电网科技有限公司 | A kind of feeder reactance voltage disturbance power-supply system |
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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 |
| 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 |
| 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 |
| CN104578154B (en) * | 2014-12-26 | 2017-11-03 | 上海新拓电力设备有限公司 | A kind of method of feeder low voltage crossing |
| 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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| JP4084909B2 (en) * | 1999-06-29 | 2008-04-30 | 三菱電機株式会社 | Power converter |
| JP4204846B2 (en) * | 2002-10-31 | 2009-01-07 | 三菱電機株式会社 | Control unit for AC excitation generator motor |
| CN2870272Y (en) * | 2006-01-20 | 2007-02-14 | 上海梅山钢铁股份有限公司 | Electric control circuit for stable control to powder-feeder frequency variator |
| CN202652141U (en) * | 2012-05-25 | 2013-01-02 | 陕西金源自动化科技有限公司 | Coal feeder frequency converter low voltage crossover device |
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| CN105871295B (en) * | 2016-05-11 | 2019-04-02 | 安徽立卓智能电网科技有限公司 | A kind of feeder reactance voltage disturbance power-supply system |
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