CN102820848A - VOC voltage automatic adjusting method and frequency converter using same - Google Patents
VOC voltage automatic adjusting method and frequency converter using same Download PDFInfo
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- CN102820848A CN102820848A CN201210290845XA CN201210290845A CN102820848A CN 102820848 A CN102820848 A CN 102820848A CN 201210290845X A CN201210290845X A CN 201210290845XA CN 201210290845 A CN201210290845 A CN 201210290845A CN 102820848 A CN102820848 A CN 102820848A
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Abstract
The invention discloses a control method for automatically adjusting direct-current voltage of an output end of a frequency converter. The method comprises the following steps of acquiring a voltage change signal of a direct-current bus of the output end of the frequency converter; transmitting the voltage change signal which is subjected to amplitude limiting and filtration by a signal acquirer to a PID (Proportion Integration Differentiation) controller, and comparing the signal with a frequency converter voltage signal set by a system to form a corresponding frequency correction signal; transmitting the frequency correction signal to a frequency synthesizer, and synthesizing the frequency correction signal and a frequency converter input frequency signal set by the system into a new correction frequency input signal; and controlling the working frequency of pulse width modulation in the frequency converter through the correction frequency input signal, and then controlling the voltage amplitude of a direct current output end of the frequency converter. According to the frequency converter, direct current output voltage can be adjusted according to pumping voltage change of the direct current end, and over current, over voltage and trip of the system are avoided. The invention also discloses the frequency converter using the method.
Description
Technical field
The present invention relates to a kind of voltage control method and device, particularly relate to a kind of voltage control method and corresponding frequency converter that is used for the frequency converter dc output end.
Background technology
During frequency converter drive motor operation,, cause frequency converter direct current overload, the OE fault alarm occurs usually because the drive connection of load change and drive system causes PN (dc terminal) voltage pump liter.This be since when during charged motivation retarding braking; Motor gets into the dynamic brake state; Its energy flows into the direct current intermediate circuit that commutating circuit is exported through the feedback diode in the inverter circuit, direct voltage is raise produce overvoltage (pump up voltage), can cause device breakdown when serious.
For the restrictive pump up voltage, common solution is to increase brake unit and brake resistance at DC side, forms pump up voltage restricting circuits.But on straight drawing machine, when fracture of wire occurring in the course of work, this dynamo-electric machine load is lost suddenly, and frequency converter can be dragged and produce huge pump up voltage by the prime motor, therefore needs to dispose high-level brake unit and brake resistance.The occasion that the machine even load of kowtowing in log machinery and oil field changes significantly; The heavy duty rotating speed descends; Remove and carry rotating speed rising afterwards, the motor slip changes greatly, causes frequency converter PN voltage pump liter; Solution in the past also is to add brake unit and brake resistance, and brake unit and brake resistance all need strengthen one grade of use.
But above solution all can increase the cost of system, and causes the increase of maintenance workload.Simultaneously, owing to change frequently, also can cause brake unit aging; Is prone to overcurrent and damages, and brake unit transfers moment of shutoff to by conducting, can produce one moment back-emf; Its value is several times of pump up voltage normal value, and the brake unit overvoltage is damaged, and causes system's tripping operation.
Summary of the invention
The purpose of this invention is to provide a kind ofly, solve because the drive motors load frequent changes significantly and causes the pump up voltage too high the technical problem of system's tripping operation the self-adjusting control method of VDC in the frequency converter (output direct voltage).
Another object of the present invention provides a kind of frequency converter that utilizes said method to realize, solves because a large amount of brake units of configuration and brake resistance cause frequency converter manufacturing cost and maintenance cost higher the technical problem that system reliability reduces.
Of the present invention to the self-adjusting control method of inverter output terminal direct voltage, comprising following steps:
Gather the voltage change signal of inverter output terminal dc bus;
The frequency converter voltage signal of sending into PID controller and default through signal picker amplitude limit, filtered voltage change signal compares, and forms corresponding frequency corrected signal;
The frequency corrected signal is delivered to frequency synthesizer, synthesize new frequency of amendment input signal with the frequency converter input frequency signal of default;
The operating frequency of pulse width modulation in the frequency of amendment input signal control of conversion device, and then the voltage magnitude of control of conversion device dc output end.
The frequency converter that the above-mentioned self-adjusting control method of inverter output terminal direct voltage of right forms; Comprise frequency converter; Be used to adopt pulse width modulation to change AC power into DC power supply output; Drive motors is characterized in that: also comprise signal picker, PID controller and frequency synthesizer
Signal picker is sent to the PID controller after being used to gather the voltage change signal of frequency converter dc output end DC power supply bus and accomplishing amplitude limit, filtering;
The PID controller is used for the frequency converter input voltage signal of frequency converter dc output end voltage signal and default is compared, and generates corresponding frequency corrected signal, is sent to frequency synthesizer;
Frequency synthesizer is used for the synthetic frequency converter correction input frequency signal of the frequency converter input frequency signal of frequency corrected signal and default is changed the incoming frequency of frequency converter.
The present invention does not have tripping operation operation VDC voltage and adjusts control method automatically; Utilize the PID controller to realize measurement, comparison and conversion, make frequency converter to change, regulate VD according to the pump up voltage of dc terminal to acquired signal; Avoid occurring overcurrent, overvoltage, system's tripping operation.
Frequency converter of the present invention can make frequency converter omit brake unit and and brake resistance, reduced equipment cost, reduced maintenance workload.
Below in conjunction with accompanying drawing specific embodiment of the present invention is described further.
Description of drawings
The control signal that Fig. 1 adjusts control method automatically for VDC voltage of the present invention flows to sketch map.
Embodiment
As shown in Figure 1; The direct voltage of the inverter output terminal of present embodiment is adjusted control method automatically; At first gather the real-time voltage signal Vdc of frequency converter 01 dc output end through signal picker 03; And compare sending to PID controller 04 frequency converter voltage signal Vsys after voltage signal Vdc amplitude limit, the filtering with default; The difference that relatively produces converts correspondent frequency corrected signal F0 into through PID controller 04 and is sent to frequency synthesizer 05; Frequency synthesizer 05 synthesizes new frequency converter frequency of amendment input signal F1, the operating frequency of PWM generator in the control of conversion device, and then the voltage magnitude of control of conversion device dc output end with the frequency converter input frequency signal Fsys of frequency corrected signal F0 and default.
In practical application; When reducing significantly appears in the drive motors load that is connected with frequency converter; The pump up voltage of frequency converter dc output end is raise fast; Can collect the real-time voltage signal Vdc of variation in real time through signal picker 03; PID controller 04 is according to the ratio conversion output correspondent frequency corrected signal F0 of the frequency converter voltage signal Vsys of real-time voltage signal Vdc and default, and frequency synthesizer 05 synthesizes new frequency converter correction input frequency signal F1 with the frequency converter input frequency signal Fsys of frequency corrected signal F0 and default, dynamically adjusts the operating frequency of PWM generator; The voltage of frequency converter dc output end is risen to keep basically after the safe voltage constant, the direct current overvoltage can not occur and cause system's tripping operation.
Utilizing the frequency converter dc terminal voltage of present embodiment to adjust the frequency converter that control method forms automatically comprises:
The frequency converter of present embodiment can omit the brake unit and the brake resistance of dc output end, reduces manufacturing cost, improves the frequency converter dc output end to by the tolerance of drive motors load variations.
Above-described embodiment describes preferred implementation of the present invention; Be not that scope of the present invention is limited; Design under the prerequisite of spirit not breaking away from the present invention; Various distortion and improvement that those of ordinary skills make technical scheme of the present invention all should fall in the definite protection range of claims of the present invention.
Claims (2)
1. one kind to the self-adjusting control method of inverter output terminal direct voltage, it is characterized in that, may further comprise the steps:
Gather the voltage change signal of inverter output terminal dc bus through signal picker (03);
The frequency converter voltage signal (Vsys) of sending into PID controller (04) and default through signal picker (03) amplitude limit, filtered voltage change signal compares, and forms corresponding frequency corrected signal;
The frequency corrected signal is delivered to frequency synthesizer (05), synthesize new frequency of amendment input signal with the frequency converter input frequency signal of default;
The operating frequency of pulse width modulation in the frequency of amendment input signal control of conversion device (01), and then the voltage magnitude of control of conversion device dc output end.
2. the frequency converter that the self-adjusting control method of inverter output terminal direct voltage according to claim 1 forms; Comprise frequency converter (01); Be used to adopt pulse width modulation to change AC power into DC power supply output; Drive motors (02) is characterized in that: also comprise signal picker (03), PID controller (04) and frequency synthesizer (05)
Signal picker (03) is sent to PID controller (04) after being used to gather the voltage change signal of frequency converter (01) dc output end DC power supply bus and accomplishing amplitude limit, filtering;
PID controller (04) is used for the frequency converter input voltage signal of frequency converter (01) dc output end voltage signal and default is compared, and generates corresponding frequency corrected signal, is sent to frequency synthesizer (05);
Frequency synthesizer (05) is used for the synthetic frequency converter correction input frequency signal of the frequency converter input frequency signal of frequency corrected signal and default is changed the incoming frequency of frequency converter (01).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201210290845XA CN102820848A (en) | 2012-08-15 | 2012-08-15 | VOC voltage automatic adjusting method and frequency converter using same |
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| CN201210290845XA CN102820848A (en) | 2012-08-15 | 2012-08-15 | VOC voltage automatic adjusting method and frequency converter using same |
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| CN102820848A true CN102820848A (en) | 2012-12-12 |
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103023405A (en) * | 2013-01-23 | 2013-04-03 | 南京航空航天大学 | Hybrid fuzzy braking method for brushless direct-current motor of electric vehicle |
| CN103944215A (en) * | 2014-03-17 | 2014-07-23 | 天津工业大学 | Resonance type charging control system based on current feedback and control method thereof |
| WO2016050044A1 (en) * | 2014-09-30 | 2016-04-07 | 海信科龙电器股份有限公司 | Variable-load, variable-frequency control method and controller |
| CN109687395A (en) * | 2018-11-27 | 2019-04-26 | 河海大学 | A kind of magnetic suspension motor power-off protection apparatus and method based on electric energy feedback |
| CN110165905A (en) * | 2018-05-08 | 2019-08-23 | 北京机电工程研究所 | Power takeoff generator simulator |
| CN112448630A (en) * | 2019-09-05 | 2021-03-05 | 麦克维尔空调制冷(武汉)有限公司 | Deceleration overvoltage suppression method for asynchronous variable frequency motor |
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103023405A (en) * | 2013-01-23 | 2013-04-03 | 南京航空航天大学 | Hybrid fuzzy braking method for brushless direct-current motor of electric vehicle |
| CN103944215A (en) * | 2014-03-17 | 2014-07-23 | 天津工业大学 | Resonance type charging control system based on current feedback and control method thereof |
| WO2016050044A1 (en) * | 2014-09-30 | 2016-04-07 | 海信科龙电器股份有限公司 | Variable-load, variable-frequency control method and controller |
| CN110165905A (en) * | 2018-05-08 | 2019-08-23 | 北京机电工程研究所 | Power takeoff generator simulator |
| CN109687395A (en) * | 2018-11-27 | 2019-04-26 | 河海大学 | A kind of magnetic suspension motor power-off protection apparatus and method based on electric energy feedback |
| CN112448630A (en) * | 2019-09-05 | 2021-03-05 | 麦克维尔空调制冷(武汉)有限公司 | Deceleration overvoltage suppression method for asynchronous variable frequency motor |
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| CB02 | Change of applicant information |
Address after: 264006, No. 11, the Yellow River Road, Yantai economic and Technological Development Zone, Shandong, China Applicant after: EURA Drives Electric Co., Ltd. Address before: 264006, No. 11, the Yellow River Road, Yantai economic and Technological Development Zone, Shandong, China Applicant before: Eura Drives Electric Co., Ltd. |
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Application publication date: 20121212 |