CN203911740U - Filtering device for output sine wave of explosion-proof three-level frequency converter - Google Patents
Filtering device for output sine wave of explosion-proof three-level frequency converter Download PDFInfo
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- CN203911740U CN203911740U CN201420236902.0U CN201420236902U CN203911740U CN 203911740 U CN203911740 U CN 203911740U CN 201420236902 U CN201420236902 U CN 201420236902U CN 203911740 U CN203911740 U CN 203911740U
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Abstract
The utility model discloses a filtering device for output sine waves of an explosion-proof three-level frequency converter. The device is mainly formed by an explosion-proof cavity, a reactor, and a capacitor. The output end of the frequency converter is connected with the input end of the reactor. The output end of the reactor is connected with a motor. The capacitor is connected with the output end of the reactor. The capacitor and the reactor are heat sources. An explosion-proof cavity housing uses a heat pipe evaporation refrigeration method to radiate heat. Comprehensively considering parameters of cable length, cable inductance, inductive reactance, and voltage reflection coefficient, parameters of the reactor and the capacitor are reasonably selected. A sine wave filter makes the output voltage and current of the frequency converter approximate to sine waves, thereby effectively restraining overvoltage and high-frequency damped oscillation on a motor end because of cable transmission and reducing motor harmonic domain switching coefficient and motor insulation pressure, so as to improve service life of the motor. The device is good in output waveforms, very low in distortion factor, low in noise, complete in protection function, and high in overall efficiency.
Description
Technical field
The utility model relates to a kind of explosion-proof type three-level converter sine wave output filter, is connected with motor for the frequency converter of long-distance transmissions under coal mine.
Background technology
Frequency converter is the important component part of AC variable-frequency speed regulation system, is one of visual plant of realizing Automation of Manufacturing Process, can bring significant energy-saving effect, has brought enormous benefits to national economy.But in a lot of commercial Application, as oil drilling, marine surveys, papermaking, mining industry etc., frequency converter and motor be not in same installation site, cable that need to be longer is transferred to motor terminal the pulse signal of frequency converter output, at this moment will produce voltage reflection phenomenon, produce overvoltage in motor terminal, high frequency damped oscillation, cause the insulating material aging speed of motor winding and cable to be accelerated, cause the insulation harm of motor or cable, even there is insulation breakdown, thereby shorten the useful life of motor, when serious, can make motor burn, cable explosion, also can accelerate the damage of motor bearings simultaneously, strengthen electromagnetic interference.
Summary of the invention
A kind of explosion-proof type three-level converter of the utility model sine wave output filter; pulse signal for long-distance transmissions arrives motor side; easily produce the phenomenons such as motor burns, cable explosion; a kind of good output waveform has been proposed; the distortion factor is very low; noise is low, defencive function is complete, the sinusoidal wave filter that overall efficiency is high.
A kind of explosion-proof type three-level converter of the utility model sine wave output filter, mainly formed by explosion-proof cavity, reactor and electric capacity, it is characterized by: the output of frequency converter is connected with the input of reactor, the output of reactor is connected with motor, and electric capacity is connected to the output of reactor.Reactor and electric capacity share an explosion-proof cavity, and explosion-proof chamber body case adopts heat pipe sweat cooling mode to dispel the heat.
The beneficial effects of the utility model are: carry out filtering by reactor and electric capacity; make output voltage and the electric current of frequency converter be similar to sine wave; can effectively suppress to produce overvoltage, high frequency damped oscillation because of long cable transmission in motor side; reduce the switching coefficient of motor harmonic wave and electrical machine insulation pressure; thereby increase useful life of motor, there is good output waveform, the distortion factor is low, noise is low, defencive function is complete, overall efficiency is high feature.Consider the parameters such as cable length, cable inductance, inductive reactance, voltage reflection coefficient, reasonably choose the parameter of reactor and electric capacity, thereby the zero load input fundamental current index that meets filter, makes no-load loss unlikely excessive, reduces the temperature in explosion-proof cavity.
Brief description of the drawings
Fig. 1 is explosion-proof type three-level converter sine wave output filter electrical schematic diagram.
Embodiment
Below in conjunction with brief description of the drawings embodiment of the present utility model:
As shown in Figure 1, the utility model is mainly made up of explosion-proof cavity, reactor and electric capacity.The output of frequency converter is connected with the input of reactor, and the output of reactor is connected with motor, and electric capacity is connected to the output of reactor.The input of three coils of reactor is connected with U, V, the W three-phase of frequency converter output respectively, the output of three coils of reactor is connected with the three-phase of motor respectively, one end also ground connection in parallel of three electric capacity, other three ends are connected with the output of three coils of reactor respectively.
Reactor and electric capacity share an explosion-proof cavity, and explosion-proof chamber body case adopts heat pipe sweat cooling mode to dispel the heat.
Be mainly L and C to choosing of reactor and capacitance parameter, because inverter circuit output voltage waveforms harmonic content is higher, for obtaining good sinusoidal waveform, must design good LC filter and eliminate near the high order harmonic component of switching frequency.Filter capacitor C
fbe filtering high order harmonic component, ensure that the THD of output voltage meets the demands.C
flarger, THD is little, but C
fconstantly increase, mean that reactive current also increases thereupon, thereby increased the capacitance of inverter, can cause inverter system volume weight to increase simultaneously, electric capacity is too large simultaneously, and the time that discharges and recharges also extends, and also can produce certain impact to output waveform.Two ends at filter inductance mainly fall in the high order harmonic component in inverter bridge output modulation waveform, so the magnitude relationship of L is to the quality of output waveform.The harmonic content that ensures output is lower, and the inductance value of filter inductance can not be too little.Increase filter inductance amount and can suppress better low-order harmonic, but the increase of inductance value brings the increasing of volume weight.Moreover, the size of filter inductance also affects the dynamic characteristic of inverter.Filter inductance is larger, and inductive current changes slower, and dynamic time is longer, and wave distortion is more serious.Reduce filter inductance, can improve the dynamic property of circuit, but the switching harmonics of output current is strengthened, increase magnetic hysteresis loss, waveform also can variation.
Comprehensive above analysis, the reactance of inductance is
, X
lrising with frequency increases.The reactance of electric capacity is
, X
crising with frequency reduces.X
l=X
ctime corresponding resonance frequency be
f c,
if the fundamental frequency of inverter output voltage is
f 0, switching frequency is
f k, have
f 0<
f c<
f k.Due to
f 0<
f c, inductance is little to the impedance of fundamental signal, and electric capacity is little to first-harmonic shunting signal, and filter allows fundamental signal to pass through.Due to
f c<
f k, inductance is very large to the impedance of switch frequency component, and electric capacity is very large to the shunting of switch frequency component, and filter does not allow switching frequency component to pass through, and does not more allow its higher harmonic components to pass through.The harmonic component of sine wave output mainly concentrates near Switching Power Supply, and therefore resonance frequency can be selected highlyer.According to cable length, cable inductance, inductive reactance, voltage reflection coefficient,
f cgenerally get switching frequency 0.04 ~ 0.1 times, L calculates by 3% ~ 5% pressure drop of inverter output voltage,
, draw the value of L; Pass through again
, draw the value of C.
Claims (2)
1. an explosion-proof type three-level converter sine wave output filter, mainly formed by explosion-proof cavity, reactor and electric capacity, it is characterized by: the output of frequency converter is connected with the input of reactor, and the output of reactor is connected with motor, and electric capacity is connected to the output of reactor.
2. a kind of explosion-proof type three-level converter sine wave output filter according to claim 1, is characterized in that: reactor and electric capacity share an explosion-proof cavity, and explosion-proof chamber body case adopts heat pipe sweat cooling mode to dispel the heat.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420236902.0U CN203911740U (en) | 2014-05-11 | 2014-05-11 | Filtering device for output sine wave of explosion-proof three-level frequency converter |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420236902.0U CN203911740U (en) | 2014-05-11 | 2014-05-11 | Filtering device for output sine wave of explosion-proof three-level frequency converter |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN203911740U true CN203911740U (en) | 2014-10-29 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201420236902.0U Expired - Lifetime CN203911740U (en) | 2014-05-11 | 2014-05-11 | Filtering device for output sine wave of explosion-proof three-level frequency converter |
Country Status (1)
| Country | Link |
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| CN (1) | CN203911740U (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104868704A (en) * | 2015-05-12 | 2015-08-26 | 南京航空航天大学 | Matrix converter input filter |
| CN112600207A (en) * | 2020-11-20 | 2021-04-02 | 赛腾机电科技（常州）有限公司 | Sine wave filter design method, device and equipment for variable-frequency three-phase motor |
-
2014
- 2014-05-11 CN CN201420236902.0U patent/CN203911740U/en not_active Expired - Lifetime
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104868704A (en) * | 2015-05-12 | 2015-08-26 | 南京航空航天大学 | Matrix converter input filter |
| CN112600207A (en) * | 2020-11-20 | 2021-04-02 | 赛腾机电科技（常州）有限公司 | Sine wave filter design method, device and equipment for variable-frequency three-phase motor |
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| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C56 | Change in the name or address of the patentee | ||
| CP01 | Change in the name or title of a patent holder |
Address after: 063020 Torch Road, Tangshan City high tech Zone, Hebei, No. 183 Patentee after: CITIC HIC KAICHENG INTELLIGENCE EQUIPMENT Co.,Ltd. Address before: 063020 Torch Road, Tangshan City high tech Zone, Hebei, No. 183 Patentee before: TANGSHAN KAICHENG ELECTRONIC CONTROL EQUIPMENT GROUP Co.,Ltd. |
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| CX01 | Expiry of patent term | ||
| CX01 | Expiry of patent term |
Granted publication date: 20141029 |