CN101610063B - High-voltage inverter carrying out soft excitation with converter and control method thereof - Google Patents
High-voltage inverter carrying out soft excitation with converter and control method thereof Download PDFInfo
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- CN101610063B CN101610063B CN200910087859XA CN200910087859A CN101610063B CN 101610063 B CN101610063 B CN 101610063B CN 200910087859X A CN200910087859X A CN 200910087859XA CN 200910087859 A CN200910087859 A CN 200910087859A CN 101610063 B CN101610063 B CN 101610063B
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Abstract
The invention provides a high-voltage inverter carrying out soft excitation with a converter, which is provided with an auxiliary winding, a low-voltage power supply, a converter and a winding side switch based on the prior art; each phase winding of the auxiliary winding is respectively corresponding to the main winding of a rectifier transformer; each phase winding of the auxiliary winding is connected with the low-voltage power supply through the converter; the converter is connected with a control system, and current output by the converter is controlled by the control system; and the winding side switch is serially connected on an auxiliary winding circuit and is controlled by the control system. Based on the structure of the prior high-voltage inverter, the high-voltage inverter pre-excites the rectifier transformer by using the work characteristics of the converter so that influence caused by striking current of the high-voltage inverter is eliminated, the accessing power supply of an auxiliary circuit is not limited by phases anymore and the structure of the auxiliary circuit in the inverter is simplified.
Description
Technical field
The present invention relates to a kind of high voltage converter, particularly a kind ofly close a floodgate or cause startup problems such as switching overvoltage and rush of current during separating brake easily at high pressure at high voltage converter, iron core is carried out the high voltage converter of soft excitation by current transformer, also relate to the control method that this high voltage converter carries out the divide-shut brake action simultaneously, belong to the power electronic equipment technical field.
Background technology
High voltage converter be industrial to heavy-duty motor control, the visual plant of speed governing.The typical structure of existing high voltage converter mainly includes rectifier transformer, rectification and inverter circuit, control system as shown in Figure 2.The High Level AC Voltage of input at first is converted into the direct current of required voltage by rectifier transformer.This direct current generates the alternating current and the output of required frequency by rectification and inverter circuit.Control system then mainly is responsible for the control and management of frequency converter in entire work process.
Such high voltage converter is when closing a floodgate at high pressure and during the high pressure separating brake, and this rectifier transformer moment can produce very big switching overvoltage, and electric capacity charges in the power model that transformer secondary side is connected, and the electric current that also can impact is excessive.Such combined floodgate impulse current is easy to the parts in the frequency converter are caused damage.
In order to reduce this combined floodgate impulse current to the influence that frequency converter caused, one of existing solution is to be in series with the current-limiting resistance of big resistance on the every phase winding of former avris of rectifier transformer, and is correspondingly provided with the current-limiting resistance by-pass switch.When frequency converter was worked at ordinary times, this by-pass switch closure made current-limiting resistance be in bypass condition.When frequency converter needed separating brake or closes a floodgate, control system was at first controlled this by-pass switch and is disconnected, and current-limiting resistance is dropped in the circuit, frequency converter was played the effect of current-limiting protection.Behind the frequency converter working stability, control system is controlled the by-pass switch closure again, makes frequency converter recover normal operating conditions.Though this method can solve the combined floodgate impulse current causes damage easily to the parts in the frequency converter problem, but because the operating voltage of rectifier transformer own is higher, the manufacturing cost of the therefore corresponding current-limiting resistance that is series at its former avris is also very high, and its design occupation space is also bigger.
In view of the existing problem of solution in the former avris series limiting resistor of frequency converter, people have also designed another impulse current that reduces to close a floodgate to solution that frequency converter impacted.This solution is in the design of the secondary side of rectifier transformer auxiliary winding to be arranged, and is in series with resistance in every auxiliary mutually winding, and should connects with the former limit synchronous accessory power supply of main power source by one by auxiliary winding.Before frequency converter starts, connect the power supply of auxiliary winding earlier, be that rectifier transformer carries out soft excitation with the way that is connected on the resistor section excision in the circuit, auxiliary at last winding is connected rated power supply, connects the transformer high-voltage main power source more simultaneously.After the excitation process is finished, at this moment cut off auxiliary winding power supply again, finish frequency converter high pressure making process.Also there is similar problem in the high pressure separating brake process of high voltage converter, just no longer repeats at this.
This method not only can solve the combined floodgate impulse current and easily the parts in the frequency converter be caused the problem of damage, and compares in the connect method of big current-limiting resistance of the former avris of rectifier transformer, has saved the design cost of high voltage converter greatly and takes up room.But, the problem of this method is that its set every phase winding of auxiliary winding all needs to be in series with current-limiting resistance on the one hand, such structure is still waiting further simplification, this solution requirement must be identical with the power phase of the former limit of rectifier transformer net side for the power supply of auxiliary winding power supply on the other hand, yet not all power plant all has such condition of power supply, and this has caused the application limitations of this solution.
In view of above problem, the present invention has designed a kind of high voltage converter that utilizes inverter carrying out soft excitation on the basis of above-mentioned solution, can not be subjected to the restriction of auxiliary winding power phase, can also further simplify the relevant connection circuit of auxiliary winding simultaneously.
Summary of the invention
Main purpose of the present invention is to solve problems of the prior art, providing a kind of closes a floodgate or causes startup problems such as switching overvoltage and rush of current during separating brake easily at high pressure at high voltage converter, iron core is carried out the high voltage converter of soft excitation by current transformer, make its auxiliary winding power supply no longer be subjected to the restriction of phase place, also further simplified the relevant connection circuit of auxiliary winding simultaneously.
The present invention also aims to provide the control method of this high voltage converter when carrying out the divide-shut brake action.
Main purpose of the present invention is achieved by following technical proposals:
A kind of high voltage converter that utilizes inverter carrying out soft excitation, include rectifier transformer, rectification and inverter circuit, control system, this rectifier transformer and rectification are connected with the inverter circuit order, this control system is carried out control and management to the course of work of whole high voltage converter, it is characterized in that: also be provided with auxiliary winding, low-tension supply, current transformer and winding side switch;
Each phase winding of described auxiliary winding is corresponding with the main winding of described rectifier transformer respectively; Each phase winding of described auxiliary winding links to each other with described low-tension supply by current transformer; Described current transformer links to each other with control system, and controlled system controls the electric current of its output; Described winding side switch series is associated on the auxiliary winding circuit, and controlled system controls its switch.
Described rectifier transformer is a three-phase rectifier transformer.
Described low-tension supply is a transformer, and will insert the power supply transformation is low voltage.
Described low-tension supply directly inserts three-phase alternating current, single-phase alternating current or direct current.
A kind of control method of utilizing the high voltage converter of inverter carrying out soft excitation realizes based on the described high voltage converter of claim 1, it is characterized in that: comprise the steps:
(1) control system detects the phase information of the former limit of rectifier transformer net side power supply;
(2) control system is sent control command according to the phase information of the former limit of detected rectifier transformer net side power supply to current transformer, makes current transformer export the low pressure accessory power supply of respective phase;
(3) control system control winding side switch closure carries out soft excitation by assisting winding to the iron core of rectifier transformer;
(4) control system detects the excitation intensity of rectifier transformer iron core, and controls the current strength that current transformer improves the low pressure accessory power supply of its output according to this;
(5) detect rectifier transformer iron core excitation when saturated when control system, control system control winding side switch disconnects, and simultaneously high voltage converter is closed a floodgate.
The invention has the beneficial effects as follows: this high voltage converter is on the basis of existing high voltage converter structure, by the work characteristics of utilizing current transformer rectifier transformer is carried out excitation in advance, thereby eliminated high voltage converter because of influence that impulse current caused, and the access power supply of its auxiliary circuit also no longer is subjected to the restriction of phase place, and the structure of auxiliary circuit also is simplified in the frequency converter.
Description of drawings
Fig. 1 is the high voltage converter structural representation that utilizes inverter carrying out soft excitation;
Fig. 2 is existing high voltage converter structural representation.
Embodiment
Below in conjunction with drawings and Examples the present invention is further described.
Fig. 1 is a specific embodiment structural representation that utilizes the high voltage converter of inverter carrying out soft excitation, and this embodiment is an example with three phase converter commonly used.As shown in the figure, this high voltage converter also is provided with auxiliary winding 4, low-tension supply 7, current transformer 6 and winding side switch 8 except including aforementioned rectifier transformer of the prior art 1, rectification and inverter circuit 3 and control system 2.
Described rectifier transformer 1 and rectification are still connected by the prior art mode in proper order with inverter circuit 3.Control system 2 is in order to control the control and management in the course of the work of whole high voltage converter.Each phase winding of described auxiliary winding 4 is corresponding with the main winding of rectifier transformer 1 respectively, i.e. this corresponding auxiliary winding and the shared iron core of main winding.Described low-tension supply 7 can be a transformer, and will insert the power supply transformation is low voltage; Also can directly insert three-phase alternating current, single-phase alternating current or direct current.Each phase winding of described auxiliary winding 4 links to each other with described low-tension supply 7 by current transformer 6, inserts power supply by current transformer 6.Described current transformer 6 links to each other with control system 2, the electric current of controlled system 2 its outputs of control.Described winding side switch 8 is connected on the auxiliary winding circuit, controlled system 2 its switches of control.
Core of the present invention is to have introduced current transformer in the auxiliary circuit of high voltage converter.So-called current transformer is a kind of electric equipment commonly used, and it can make access power source voltage, frequency, phase place and other electric weight or characteristic change by signal controlling, exports the power supply of required voltage, frequency, phase place.The present invention promptly is these characteristics of utilizing current transformer, by current transformer being introduced the auxiliary circuit of high voltage converter, make its auxiliary circuit no longer be inserted the phase limit of power supply, can carry out soft excitation to rectifier transformer by any power supply, thereby realize having eliminated the purpose of high voltage converter because of the influence that impulse current caused.
This utilizes the concrete combined floodgate control method step of high voltage converter of inverter carrying out soft excitation as follows:
(1) control system 2 detects the phase information of rectifier transformer 1 former limit net side power supply;
(2) control system 2 is sent control command according to the phase information of detected rectifier transformer 1 former limit net side power supply to current transformer 6, makes current transformer 6 export the low pressure accessory power supply of respective phase;
(3) control system 2 control winding side switches 8 closures are carried out soft excitation by the iron core of assisting 4 pairs of rectifier transformers 1 of winding;
(4) control system 2 detects the excitation intensity of rectifier transformer 1 iron core, and controls the current strength that current transformer 6 improves the low pressure accessory power supply of its output according to this;
(5) detect rectifier transformer 1 iron core excitation when saturated when control system 2, control system 2 control winding side switches 8 disconnect, and simultaneously high voltage converter are closed a floodgate.
Above-mentioned is the making process of high voltage converter.And the separating brake process of high voltage converter is the inverse process of said process, just no longer repeats at this.
As seen, by above-mentioned control method the designed high voltage converter that utilizes inverter carrying out soft excitation of the present invention is carried out divide-shut brake control.This high voltage converter is owing to adjust the access power supply of its auxiliary circuit by current transformer, therefore need not be subjected to auxiliary circuit to insert the restriction of power phase again, thereby can use any access power supply all to realize, to have eliminated high voltage converter because of influence that impulse current was caused to the rectifier transformer soft excitation.Moreover,, therefore saved employed current-limiting resistance in the existing high voltage converter auxiliary circuit, simplified the structure of frequency converter, reduced the design cost of frequency converter and take up room because the output current intensity of current transformer can controlled system regulation.
Should be noted that above-mentioned embodiment illustrated in fig. 1 only be to be example with the typical three-phase high voltage converter.In actual applications, no matter for the high voltage converter of several phases, as long as according to said structure in the described current transformer of connecting between auxiliary winding and the low-tension supply, the work of the influence that impulse current caused that is produced in the time of can finishing elimination by the frequency converter on/off switch.
In sum, the high voltage converter that utilizes inverter carrying out soft excitation that the present invention is designed is on the basis of existing high voltage converter structure, by the work characteristics of utilizing current transformer rectifier transformer is carried out excitation in advance, thereby eliminated high voltage converter because of influence that impulse current caused, and the access power supply of its auxiliary circuit also no longer is subjected to the restriction of phase place, and the structure of auxiliary circuit also is simplified in the frequency converter.Persons skilled in the art are on the basis of this design principle, and any conspicuous transformation of being done all should be considered as within protection scope of the present invention.
Claims (5)
1. high voltage converter that utilizes inverter carrying out soft excitation, include rectifier transformer, rectification and inverter circuit, control system, this rectifier transformer and rectification are connected with the inverter circuit order, this control system is carried out control and management to the course of work of whole high voltage converter, it is characterized in that: also be provided with auxiliary winding, low-tension supply, current transformer and winding side switch;
Each phase winding of described auxiliary winding is corresponding with the main winding of described rectifier transformer respectively; Each phase winding of described auxiliary winding links to each other with described low-tension supply by current transformer; Described current transformer links to each other with control system, and controlled system controls the electric current of its output; Described winding side switch series is associated on the auxiliary winding circuit, and controlled system controls its switch.
2. the high voltage converter that utilizes inverter carrying out soft excitation as claimed in claim 1 is characterized in that: described rectifier transformer is a three-phase rectifier transformer.
3. the high voltage converter that utilizes inverter carrying out soft excitation as claimed in claim 1 is characterized in that: described low-tension supply is a transformer, and will insert the power supply transformation is low voltage.
4. the high voltage converter that utilizes inverter carrying out soft excitation as claimed in claim 1 is characterized in that: described low-tension supply directly inserts three-phase alternating current, single-phase alternating current or direct current.
5. a control method of utilizing the high voltage converter of inverter carrying out soft excitation realizes based on the described high voltage converter of claim 1, it is characterized in that: comprise the steps:
(1) control system detects the phase information of the former limit of rectifier transformer net side power supply;
(2) control system is sent control command according to the phase information of the former limit of detected rectifier transformer net side power supply to current transformer, makes current transformer export the low pressure accessory power supply of respective phase;
(3) control system control winding side switch closure carries out soft excitation by assisting winding to the iron core of rectifier transformer;
(4) control system detects the excitation intensity of rectifier transformer iron core, and controls the current strength that current transformer improves the low pressure accessory power supply of its output according to this;
(5) detect rectifier transformer iron core excitation when saturated when control system, control system control winding side switch disconnects, and simultaneously high voltage converter is closed a floodgate.
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| CN200910087859XA CN101610063B (en) | 2009-06-24 | 2009-06-24 | High-voltage inverter carrying out soft excitation with converter and control method thereof |
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| CN200910087859XA CN101610063B (en) | 2009-06-24 | 2009-06-24 | High-voltage inverter carrying out soft excitation with converter and control method thereof |
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| CN101610063B true CN101610063B (en) | 2011-11-23 |
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| CN101777826B (en) * | 2009-12-24 | 2013-10-23 | 艾默生网络能源有限公司 | Converter device and auxiliary circuit used for same |
| CN101860232B (en) * | 2010-03-29 | 2012-08-08 | 北京利德华福电气技术有限公司 | Resonant type pre-charging circuit for high-voltage frequency converter and control method thereof |
| CN102412777B (en) * | 2011-12-02 | 2014-08-27 | 华中科技大学 | Self shunt excitation control system of series structure of three current-mode single-phase bridge-type convertors |
| CN104316770A (en) * | 2014-10-27 | 2015-01-28 | 展鹏科技股份有限公司 | On-line asynchronous motor stator resistance measurement method and device of frequency converter special for elevator traction machine |
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