CN102364872A - Variable frequency energy saving device for low-voltage three-phase asynchronous motor control system - Google Patents
Variable frequency energy saving device for low-voltage three-phase asynchronous motor control system Download PDFInfo
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- CN102364872A CN102364872A CN2011103565768A CN201110356576A CN102364872A CN 102364872 A CN102364872 A CN 102364872A CN 2011103565768 A CN2011103565768 A CN 2011103565768A CN 201110356576 A CN201110356576 A CN 201110356576A CN 102364872 A CN102364872 A CN 102364872A
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E40/00—Technologies for an efficient electrical power generation, transmission or distribution
- Y02E40/30—Reactive power compensation
Abstract
The invention discloses a variable frequency energy saving device for a low-voltage three-phase asynchronous motor control system. The device comprises an asynchronous motor, an alternating current contactor and a circuit breaker, and further comprises a frequency converter, wherein the asynchronous motor, the frequency converter, the alternating current contactor and the circuit breaker are sequentially elastically connected in series. By the device, the conventional frequency converter is connected to the low-voltage three-phase asynchronous motor control system to realize regulation control over a power factor and load power of a load; and compared with the conventional control system, the low-voltage three-phase asynchronous motor control system has better energy saving effects.
Description
Technical field
The present invention relates to the AC low-tension threephase asynchronous, relate in particular to the frequency converting and energy saving device of low-voltage three phase asynchronous motor control system.
Background technology
Control mode and working method that present threephase asynchronous adopts can be divided into following several kinds:
A, direct start-up control mode, power frequency operation;
B, star triangle start control mode, power frequency operation;
C, compensator starting control mode, power frequency operation;
D, frequency sensitive trheostat start-up control mode (rotor wire wound type asynchronous motor), rotor-side variable frequency starts (difference on the frequency is bigger), power frequency operation;
E, soft start control mode, power frequency operation.
In the above-mentioned several kinds of control modes, a, b class Starting mode are applicable to small power motor or the lighter application places of load, and c, d, e class Starting mode are applicable to the big or heavier application places of load of power of motor.
More than five kinds of control modes all have certain shortcoming:
Inevitably there are very big mechanical shock in a, b, c class start-up control mode on the control load mechanical property, for the machining class, cause impact damage or damage, the belt creep wearing and tearing of gear easily; For the blower fan load of the pumps, cause impeller of blower moment to quicken and be out of shape easily, and water pump moment draw water pipeline is produced water hammer effect and causes pipeline breaking or the damage of accumulative total property.And the power factor of load and bearing power can't regulate, and do not possess energy-efficient performance;
D, e class control mode are relatively milder on the load machinery characteristic, and the electric current of control motor also is controlled in the scope of design, but the power factor of load and bearing power can't regulate, and do not possess energy-efficient performance.
In sum, the control mode that existing threephase asynchronous adopts all can't be regulated the power factor and the bearing power of load, and energy-efficient performance is not good.
Summary of the invention
To above defective, the present invention provides a kind of frequency converting and energy saving device of low-voltage three phase asynchronous motor control system, solves the problem that existing threephase asynchronous control mode can't be regulated the power factor and the bearing power of load.
For realizing above-mentioned purpose, the present invention realizes through following technical scheme:
Low-voltage three phase asynchronous motor control system frequency converting and energy saving device comprises asynchronous motor, A.C. contactor and circuit breaker, also comprises frequency converter, and asynchronous motor, frequency converter, A.C. contactor and circuit breaker elasticity are connected in series successively.
The present invention is through Inverter Application, can produce energy-saving effect aspect following three:
1, energy-saving and frequency-variable
Can know by fluid mechanics, P (power)=Q (flow) * H (pressure), flow Q is directly proportional with the first power of rotational speed N, square being directly proportional of pressure H and rotational speed N, cube being directly proportional of power P and rotational speed N.If the efficient of water pump is certain, when requiring to regulate flow decline, rotational speed N can proportionally descend, and this moment, shaft power P became cubic relationship to descend, and promptly the power consumption of pump motor is approximated to cube relation of ratio with rotating speed.For example: a pump motor power is 55KW, when rotating speed drop to former rotating speed 4/5 the time, its power consumption is 28.16KW, power saving 48.8%, when rotating speed drop to former rotating speed 1/2 the time, its power consumption is 6.875KW, power saving 87.5%.Therefore, in the present invention, can realize adjusting, thereby reach the purpose of quick reduction power consumption rotating speed.
2, power factor compensation is energy-conservation
Reactive power not only increases the heating of line loss and equipment, and the reduction of power factor that main is causes the reduction of electric network active power, and a large amount of reactive energy consumption are in the middle of circuit, and the equipment service efficiency is low; Waste is serious, by formula P=S * COS Φ, and Q=S * SIN Φ, wherein S-apparent power; P-active power, the Q-reactive power, COS Φ-power factor can know that COS Φ is big more; Active power P is big more, and the power factor of light water pump motor is between 0.6-0.7, behind the use RHVC, because the effect of the inner filter capacitor of frequency converter; COS Φ ≈ 1, thus reactive loss reduced, increased the active power of electrical network.
3, frequency conversion soft start is energy-conservation
Directly start or during the star triangle start, starting current approximates 4-7 times of rated current, can cause serious impact to electromechanical equipment and power supply grid like this, but also can require too high to net capacity at motor.The vibrations that the big electric current that produces during startup causes are very big to the infringement of baffle plate and valve, and are totally unfavorable to the useful life of equipment, pipeline.And behind the use frequency converting and energy saving device; Utilize the soft start function of frequency converter that starting current will be started from scratch, maximum also is no more than rated current, has alleviated to the impact of electrical network with to the requirement of power supply capacity; Prolong the useful life of equipment and valve, saved the maintenance cost of equipment.
Description of drawings
According to embodiment and accompanying drawing the present invention is done further explain below.
Fig. 1 is the control and the operation electric diagram of directly startup and star triangle start;
Fig. 2 is control and the operation electric diagram that auto coupling decompression start and frequency sensitive trheostat start;
Fig. 3 is the control and the operation electric diagram of frequency converting and energy saving device according to the invention.
Among the figure:
1, asynchronous motor; 2, thermal relay; 3, A.C. contactor; 4, circuit breaker; 5, autotransformer; 6, frequency sensitive trheostat; 7, frequency converter.
Embodiment
As shown in Figure 3; Provided the structural representation of a specific embodiment of low-voltage three phase asynchronous motor control system frequency converting and energy saving device according to the invention; Low-voltage three phase asynchronous motor control system frequency converting and energy saving device; Comprise asynchronous motor 1, A.C. contactor 3, circuit breaker 4 and frequency converter 7, asynchronous motor 1, frequency converter 7, A.C. contactor 3 and circuit breaker 4 elasticity are connected in series successively.
As shown in Figure 1, when directly starting, directly start asynchronous motor 1 operation through A.C. contactor 3, thermal relay 2 is as asynchronous motor 1 thermal overload protection.During the star triangle start, asynchronous motor 1 is in star decompression starting mode, and asynchronous motor 1 was in the triangle operational mode after delayed startup finished.
As shown in Figure 2, during auto coupling decompression start, asynchronous motor 1 is in the reduced-voltage starting mode of 65% tap of self coupling transformation, asynchronous motor 1 total head operation after delayed startup or electric current drop to set point, and this moment, autotransformer 5 was out of service.When frequency sensitive trheostat 6 started, the winding of asynchronous motor 1 coil wound rotor was connected in series in the winding of frequency sensitive trheostat 6 through the collector ring of asynchronous motor 1, and this moment, the rotor speed difference was big; Power frequency is bigger, and asynchronous motor 1 startup presents hardware features, and detent torque is bigger; After startup finished, frequency sensitive trheostat 6 was out of service, and the winding of the coil wound rotor of asynchronous motor 1 is through the collector ring of asynchronous motor 1; By A.C. contactor 3 short circuits, this moment, asynchronous motor 1 was in the total head running status.
As shown in Figure 3, be one embodiment of the present of invention, the startup of asynchronous motor 1 and operation all are in the VFC state, and operating frequency is determined by the setup parameter of frequency converter 7.
The present invention has realized that through former frequency converter is inserted the low-voltage three phase asynchronous motor control system original relatively control system has better energy-saving effect to the adjusting control of the power factor and the bearing power of load.
Claims (1)
1. low-voltage three phase asynchronous motor control system frequency converting and energy saving device comprises asynchronous motor, A.C. contactor and circuit breaker, it is characterized in that: also comprise frequency converter, asynchronous motor, frequency converter, A.C. contactor and circuit breaker elasticity are connected in series successively.
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| Application Number | Priority Date | Filing Date | Title |
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| CN2011103565768A CN102364872A (en) | 2011-11-11 | 2011-11-11 | Variable frequency energy saving device for low-voltage three-phase asynchronous motor control system |
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| CN2011103565768A CN102364872A (en) | 2011-11-11 | 2011-11-11 | Variable frequency energy saving device for low-voltage three-phase asynchronous motor control system |
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| CN102364872A true CN102364872A (en) | 2012-02-29 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106026787A (en) * | 2016-07-11 | 2016-10-12 | 太原理工大学 | Five-stage discrete frequency-conversion soft-start device based on power factor angle closed-loop control |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP1206030A2 (en) * | 2000-11-09 | 2002-05-15 | Grundfos A/S | Method of running an inverter controlled electric motor and motor arrangement integrating an inverter controlled electric motor |
| CN201270497Y (en) * | 2008-09-25 | 2009-07-08 | 安徽怡能电子科技有限公司 | Variable frequency and power frequency operation main circuit structure for three phase AC electric motor |
| CN202550961U (en) * | 2011-11-11 | 2012-11-21 | 安徽禾田电气有限公司 | Frequency conversion energy-saving device of low-voltage three-phase asynchronous motor control system |
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- 2011-11-11 CN CN2011103565768A patent/CN102364872A/en active Pending
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP1206030A2 (en) * | 2000-11-09 | 2002-05-15 | Grundfos A/S | Method of running an inverter controlled electric motor and motor arrangement integrating an inverter controlled electric motor |
| CN201270497Y (en) * | 2008-09-25 | 2009-07-08 | 安徽怡能电子科技有限公司 | Variable frequency and power frequency operation main circuit structure for three phase AC electric motor |
| CN202550961U (en) * | 2011-11-11 | 2012-11-21 | 安徽禾田电气有限公司 | Frequency conversion energy-saving device of low-voltage three-phase asynchronous motor control system |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106026787A (en) * | 2016-07-11 | 2016-10-12 | 太原理工大学 | Five-stage discrete frequency-conversion soft-start device based on power factor angle closed-loop control |
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Application publication date: 20120229 |