CN1545199A - Method for processing power module fault of high voltage and high power frequency converter - Google Patents
Method for processing power module fault of high voltage and high power frequency converter Download PDFInfo
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- CN1545199A CN1545199A CNA031558267A CN03155826A CN1545199A CN 1545199 A CN1545199 A CN 1545199A CN A031558267 A CNA031558267 A CN A031558267A CN 03155826 A CN03155826 A CN 03155826A CN 1545199 A CN1545199 A CN 1545199A
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Abstract
The invention discloses a processing method when high-voltage high-power frequency converter has failure in power module, including the following steps: 1, when the system detects a failure in some power module, it will block the output, and then triggers the bypass circuit in order to keep connection between other modules; 2, it regulates the given voltage of the power module to make keep three-phase output line voltages still balanced, that is, their amplitudes are equal, and their phases are shifted by a 120-degree angle, and enhance the voltage output ability of the frequency converter as fully as possible.
Description
Technical field
The present invention relates to a kind of high-voltage high-power frequency transformator that constitutes by a plurality of power model units in series, more particularly, relate to when one or more power model fault, still can make high-voltage high-power frequency transformator have the method for higher output.
Background technology
Development along with power electronic technology, frequency converter is as the product of Development of Power Electronic Technology, every field in national economy is widely used as industries such as metallurgy, petrochemical industry, running water, electric power, and bringing into play more and more important effect, particularly, the application of high-voltage high-power frequency transformator is day by day extensive.And, the high-voltage high-power frequency transformator (as shown in Figure 2) that is made of as shown in Figure 1 power model units in series is as the frequency converter that is fit to China's actual conditions, excellent performance, be subjected to numerous frequency converter production firm, scientific research institutions, engineers and technicians, user's favor, shown the prospect that it is in the ascendant.
Because each of high-voltage high-power frequency transformator all is made of several power model units in series mutually, behind a certain some or several power model cell failures in mutually, cause frequency converter output phase shortage, so, usually at each next door, power model unit bypass circuit in parallel.In the frequency converter running, when certain module broke down, the controller output control signal in the frequency converter was blocked the output of this module, makes its bypass circuit work, keep the series relationship of all the other a plurality of modules, this that makes frequency converter still has voltage output mutually.
But, because the output order of frequency converter three-phase module is balanced, so, break down and when out of service, the imbalance of three-phase voltage of the actual output of frequency converter will occur as one or many modules.
At present, in order to keep the balance of frequency converter three-phase output voltage, the method that everybody adopts usually is: simultaneously similar number, normal power model in the other two-phase of frequency converter are bypassed, reach the purpose that makes frequency converter three-phase output voltage balance.Though this way has reached the purpose that makes frequency converter three-phase output voltage balance,, reduced the rated value of frequency converter output voltage, sacrificed normal, good power model unit.
Summary of the invention
In view of the foregoing, the purpose of this invention is to provide a kind ofly when certain or certain several power model cell failure, under the prerequisite of other normal power module of not bypass, still can make high-voltage high-power frequency transformator have the method for high output voltage.
For achieving the above object, the present invention is by the following technical solutions: a kind of high-voltage high-power frequency transformator makes high-voltage high-power frequency transformator still have the method for high output when the power model fault, and this method may further comprise the steps:
1, system detect certain mutually certain power model break down, block its output, then, trigger its bypass circuit, keep the annexation of other module;
2, adjust the voltage given of power model, it is that amplitude equates that the line voltage that the frequency converter three-phase is exported still keeps balance, phase place mutual deviation 120 degree, and increase its voltage fan-out capability as far as possible.
The present invention is not by the given method of voltage magnitude of the power model unit of the less phase of bypass or bypass number by relative reduction; Or it is given equal to keep each power model cell voltage amplitude, only adjusts the method at the phase angle between the given voltage of three phase power modular unit, makes the line voltage of frequency converter three-phase output keep balance.
The present invention is also by increasing the given peak value of power module voltage, make line voltage as far as possible with do not take place before the power model bypass approaching.
The present invention also by remove a side-play amount on the command value of each power model output phase voltage, increases the voltage utilization of frequency converter, improves the ability of the output voltage of frequency converter.
Control method of the present invention is simple, and thinking is ingenious, under the situation of not sacrificing " health " power model, makes the frequency converter three-phase output voltage keep balance, and line voltage as far as possible with do not take place before the power model bypass approaching.In addition, the present invention also by remove the method for a side-play amount on the command value of each power model output phase voltage, increases the voltage utilization of frequency converter, improves the ability of the output voltage of frequency converter.
Description of drawings
Fig. 1 is the power model unit internal circuit diagram that constitutes high-voltage high-power frequency transformator;
Fig. 2 is the high-voltage high-power frequency transformator structural representation that is made of power model units in series shown in Figure 1;
Fig. 3 is after a power model cell failure is by bypass, by reducing the given frequency converter three-phase output voltage principle for balance figure that keeps of other two-phase module voltage;
Fig. 4 be the power model cell failure by bypass after, make three unbalanced vectors of frequency converter output constitute the schematic diagram of equilateral triangles by the method for adjusting the phase angle between the given voltage of three phase power modular unit;
Fig. 5 adopts the computer iterations method to calculate the rudimentary algorithm of angle shown in Figure 4;
Fig. 6 is change angle of the present invention, a specific embodiment that improves voltage utilization
Embodiment
For for ease of maintenaince, adapt to the needs of different electric pressures, high-voltage high-power frequency transformator adopts modularized design more at present, and promptly each of frequency converter all is to be made of several power model units in series mutually.Can change the voltage output of power model unit by the voltage instruction that changes power model, thereby change the three-phase output voltage of frequency converter.
Method provided by the present invention is exactly: when frequency converter after some or several modules break down by bypass in mutually, by adjusting the voltage given of power model, it is that amplitude equates that the line voltage that the frequency converter three-phase is exported still keeps balance, phase place mutual deviation 120 degree, and increase its voltage fan-out capability as far as possible.
Adjust the voltage given of transducer power modular unit, can realize by following two kinds of concrete grammars:
Method one: when frequency converter detect certain mutually in some or several modules break down, after its bypass; Correspondingly reduce the voltage magnitude instruction of other two-phase power model, make frequency converter three-phase output voltage balance.
Fig. 3 is the method schematic diagram.As shown in the figure, suppose every n module that have mutually, when A has a modules A mutually
iBreak down, when the voltage instruction of A phase power model is still U, correspondingly the voltage magnitude instruction with B, C phase power model becomes U* (n-1)/n, like this, need not sacrifice normal, good power model and just can make the frequency converter three-phase output voltage reach balance.
The result of Chu Liing like this, in fact with B mutually, C respectively bypasses the module of a health mutually, the voltage of generation is the same.But the result who does like this has very big benefit.Traditional, normal module is bypassed to reach frequency converter three-phase output measures for balance, make normal module recovery operation once more if want to cancel bypass, often there is a transient process in more complicated on technology realizes; And the present invention does not bypass module normal, " health ", so, except that malfunctioning module, other module is all in normal operation, at this moment, if B mutually or C have a module to break down again mutually, then the voltage instruction of the module of corresponding phase can be reverted to U, system voltage still can remain unchanged, and controls easier.And traditional processing method, if B mutually or C have a module to break down again mutually, 3 modules of bypass once more, the rated value of frequency converter output voltage needs to reduce 1/n again.
Method two: when frequency converter detect certain mutually in some or several modules break down, after its bypass; It is given equal to keep each power model cell voltage amplitude, only adjusts the phase angle between the given voltage of three phase power modular unit, makes the output of frequency converter three-phase line voltage keep balance.
The output voltage of supposing each power model is 1, no matter which phase is the module of damaging occur in, generality and easy to understand for method, we suppose that also remaining mutually m the module of A is " health " power model, B is also remaining k " health " power model mutually, C is also remaining p " health " power model mutually, and then three voltages of being on good terms output are respectively m, k, p.
We know, as the alternating current machine of the load of high-voltage variable-frequency and variable-speed system as herein described, as long as the line balance of voltage is just passable.If regard the output of frequency converter as a black box, motor is can't see frequency converter in-built, and just is concerned about the voltage balance whether of output U, V, the W terminal of frequency converter.Therefore, normally move in order to make motor, frequency converter should guarantee that the vector end points of its A, B, C three-phase constitutes an equilateral triangle and gets final product as shown in Figure 4.
Remaining issues has been exactly simple pure geometrical issues.As shown in Figure 4, from three vectors of end points O, length is respectively m, k, p, how to determine its angle each other, makes its end points U, V, W constitute an equilateral triangle.Can compile a simple program with current general C, mathematical tools such as FORTRAN, MATLAB, as shown in Figure 5, the angle by iterative computation goes out to need is easy to calculate this angle for those of ordinary skills.After angle calculation was come out, the programmer can deposit table by the frequency convertor system failure condition corresponding with it with the angle value of calculated off-line, directly used in embedded system.Certainly, also can use online Calculation Method, but take the too much resource of single-chip microcomputer,, also can have influence on the real-time of control, lose more than gain, therefore generally not advise using if handle badly in the line computation meeting.
Export the angle between the phase voltage according to frequency converter U, V, W three-phase that aforementioned calculation goes out, change all " health " power model phase angles, the voltage magnitude of all " healthy " power models is given to remain consistent, make frequency converter three-phase output voltage balance, the polar plot of three-phase output voltage is an equilateral triangle.
In addition, according to the requirement of alternating current machine to voltage, the voltage magnitude that the designer can revise each power model given (also obtaining a table exists in the embedded system mentioned above), the line voltage that needing to obtain is exported, and satisfies the requirement of alternating current machine to voltage.
In concrete enforcement, also need to solve some problems.In existing technology,, generally adopt multistage sine pulse width modulation (PWM) modulator approach for the plural serial stage high-voltage variable-frequency and variable-speed system.In the method, in order to improve voltage utilization, can be under the constant situation of carrier wave, go up synchronous 3 subharmonic of stack at the given reference waveform of three-phase (being the sinusoidal fundamental wave waveform), like this, 3 subharmonic occur in phase voltage, and in the on-Line Voltage, because 3 subharmonic phase places are identical, cancel each other.But,,, can obtain higher voltage owing to avoided ovennodulation for fundamental voltage.
When certain power model breaks down, according to above-mentioned method, adjusted the phase place between the three phase power module voltage, phase place no longer is 120 degree, at this moment, can not rely on triple-frequency harmonics to improve voltage utilization again; Because triple-frequency harmonics can not have been cancelled each other.
For this reason, the present invention proposes a kind of new method, promptly on the command value of each power model output phase voltage, remove the method for a side-play amount, remove a side-play amount and only have influence on phase voltage, the not influence of line voltage.This method combines with the method for adjustment phase place mentioned above, is used for the PWM control of power model series connection high-voltage variable-frequency and variable-speed system, can improve voltage utilization.
As shown in Figure 6, at first, should guarantee that the line voltage peak equates, phase place mutual deviation 120 degree.Under the situation of known fault phenomenon (being m, k, p), redefine a, b, three angles that c is alternate according to method shown in Figure 5, just can guarantee this point; Simultaneously, in the algorithm of Fig. 5, also can know the requirement according to line voltage, how many voltage peak instructions of each module (or each phase) is.The phase difference that need this moment when not taking place with respect to this bypass, has a deviation, this deviation is added on the instantaneous phase angle of three-phase voltage, just can draw as the phase angle of three-phase Φ a, Φ b, Φ c.If adopt sinusoidal control, the sine value at electricity consumption voltage crest phase angle on duty can obtain three-phase voltage current instantaneous value Ua, Ub, Uc:
Ua＝V1*SINΦa
Ub＝V1*SINΦb
Uc＝V1*SINΦc
In order to improve voltage utilization, these three values directly can not be delivered in the PWM generator, the present invention proposes method shown in Figure 6, calculate above-mentioned side-play amount.Among Fig. 6, offset U offset can be obtained by following two kinds of methods:
Can know that by checking these two kinds of methods can effectively improve voltage utilization, but according to the concrete difference of the original module number of module number and system of bypass, the effect of two kinds of methods is difference to some extent.Certainly, the user can do a decision procedure in program, and which which well just uses.
The load of high-voltage variable-frequency and variable-speed system is generally alternating current machine, considers the needs of speed regualtion of AC motor, and frequency conversion speed-adjusting system does not generally move under rated output voltage and specified output frequency.As everyone knows, alternating current machine is when speed governing, and is saturated for fear of magnetic flux, the coordinated control mode of generally taking voltage to be directly proportional with frequency, and promptly when speed was lower than rated speed, voltage was also lower; At this moment, by the situation of bypass, system's output voltage capability decreases if the power model fault takes place, and still, by the voltage peak instruction of suitable adjustment power model, but still may satisfy at the needs than the complete operate as normal of alternating current machine under the slow-speed of revolution.In Fig. 4, the equilateral triangle shown in the outside dotted line has been represented the line voltage swing of alternating current machine, and the ratio of the line voltage of this line voltage during with bypass not is to calculate in algorithm shown in Figure 5.At this moment, the given V1 among given Fig. 6 suitably can be increased, if this moment, the situation of ovennodulation does not appear in PWM, equates that motor still can normally move when then output voltage still can be with bypass not.
Among the present invention, do not limit the concrete numerical value of m, k, p, therefore, for the system that arbitrarily individual power model series connection constitutes, the method that the present invention proposes all is suitable for.
Claims (6)
1. one kind makes high-voltage high-power frequency transformator have the high method of exporting when the power model fault, each of this high-voltage high-power frequency transformator is made of several power model units in series, each power model unit is parallel with a bypass circuit, it is characterized in that: said method comprising the steps of:
(1) system detect certain mutually certain power model break down, block its output, trigger its bypass circuit, keep the annexation of other module;
(2) it is that amplitude equates that the voltage given of adjustment power model, the line voltage that the frequency converter three-phase is exported still keep balance, phase place mutual deviation 120 degree, and increase its voltage fan-out capability as far as possible.
2. method according to claim 1 is characterized in that: described step 2 is meant: relatively reduce not by the voltage magnitude of the power model unit of the less phase of bypass or bypass number given.
3. method according to claim 1 is characterized in that: described step 2 is meant: it is given equal to keep each power model cell voltage amplitude, only adjusts the phase angle between the given voltage of three phase power modular unit, makes line voltage keep balance.
4. according to claim 1 or 2 or 3 described methods, it is characterized in that: described power model adopts the PWM modulation system.
5. according to claim 1 or 2 or 3 described methods, it is characterized in that: increase the given peak value of power module voltage, make line voltage as far as possible with do not take place before the power model bypass approaching.
6. according to claim 1 or 2 or 3 described methods, it is characterized in that: on the command value of each power model output phase voltage, remove a side-play amount, increase the voltage utilization of frequency converter, improve the ability of the output voltage of frequency converter.
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| CN031558267A CN100407566C (en) | 2003-08-22 | 2003-08-22 | Method for processing power module fault of high voltage and high power frequency converter |
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| CN031558267A CN100407566C (en) | 2003-08-22 | 2003-08-22 | Method for processing power module fault of high voltage and high power frequency converter |
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| CN100407566C CN100407566C (en) | 2008-07-30 |
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Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101882862A (en) * | 2010-06-30 | 2010-11-10 | 江苏省电力公司泰州供电公司 | Bypass fault tolerance method for cascaded high-voltage frequency converter |
| CN101917115A (en) * | 2010-06-30 | 2010-12-15 | 上海发电设备成套设计研究院 | Bypass circuit for online replacement of power unit of high voltage frequency converter |
| CN101951134A (en) * | 2010-08-24 | 2011-01-19 | 艾默生网络能源有限公司 | Cascade topology frequency converter and bypass topology thereof |
| CN102097925A (en) * | 2010-12-21 | 2011-06-15 | 国电南京自动化股份有限公司 | Concatenated high voltage frequency converter bypassing processing method |
| CN101699732B (en) * | 2009-10-30 | 2012-08-22 | 艾默生网络能源有限公司 | Fault control method of converter |
| CN102832794A (en) * | 2012-08-22 | 2012-12-19 | 深圳市英威腾电气股份有限公司 | Frequency converter system and fault processing method thereof |
| CN103227570A (en) * | 2013-05-15 | 2013-07-31 | 河南工业大学 | Method for treating unit fault of unit-cascaded frequency converter |
| WO2014023569A2 (en) | 2012-08-08 | 2014-02-13 | Abb Technology Ag | Method for operating a power electronics circuit |
| CN104269998A (en) * | 2014-09-28 | 2015-01-07 | 中冶赛迪电气技术有限公司 | Unit bypass device and control method of unit series frequency converter |
Family Cites Families (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4757435A (en) * | 1986-03-19 | 1988-07-12 | Westinghouse Electric Corp. | Static-controlled current-source AC/DC power converter and DC/AC power converter, and protection system embodying the same |
| CN100385782C (en) * | 2000-12-27 | 2008-04-30 | 艾默生网络能源有限公司 | Multiple-level serially connected high-voltage inverter |
| CN1248395C (en) * | 2002-02-10 | 2006-03-29 | 北京利德华福电气技术有限公司 | By-pass circuit of high voltage variable frequency speed regulator |
-
2003
- 2003-08-22 CN CN031558267A patent/CN100407566C/en not_active Expired - Lifetime
Cited By (12)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101699732B (en) * | 2009-10-30 | 2012-08-22 | 艾默生网络能源有限公司 | Fault control method of converter |
| CN101882862A (en) * | 2010-06-30 | 2010-11-10 | 江苏省电力公司泰州供电公司 | Bypass fault tolerance method for cascaded high-voltage frequency converter |
| CN101917115A (en) * | 2010-06-30 | 2010-12-15 | 上海发电设备成套设计研究院 | Bypass circuit for online replacement of power unit of high voltage frequency converter |
| CN101951134A (en) * | 2010-08-24 | 2011-01-19 | 艾默生网络能源有限公司 | Cascade topology frequency converter and bypass topology thereof |
| CN102097925A (en) * | 2010-12-21 | 2011-06-15 | 国电南京自动化股份有限公司 | Concatenated high voltage frequency converter bypassing processing method |
| CN102097925B (en) * | 2010-12-21 | 2013-04-10 | 国电南京自动化股份有限公司 | Concatenated high voltage frequency converter bypassing processing method |
| WO2014023569A2 (en) | 2012-08-08 | 2014-02-13 | Abb Technology Ag | Method for operating a power electronics circuit |
| CN102832794A (en) * | 2012-08-22 | 2012-12-19 | 深圳市英威腾电气股份有限公司 | Frequency converter system and fault processing method thereof |
| CN102832794B (en) * | 2012-08-22 | 2015-01-14 | 深圳市英威腾电气股份有限公司 | Frequency converter system and fault processing method thereof |
| CN103227570A (en) * | 2013-05-15 | 2013-07-31 | 河南工业大学 | Method for treating unit fault of unit-cascaded frequency converter |
| CN103227570B (en) * | 2013-05-15 | 2017-11-17 | 河南工业大学 | A kind of processing method during unit cascade type frequency converter unit failure |
| CN104269998A (en) * | 2014-09-28 | 2015-01-07 | 中冶赛迪电气技术有限公司 | Unit bypass device and control method of unit series frequency converter |
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| CN100407566C (en) | 2008-07-30 |
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