CN105281579A - Input active current calculation method of high-voltage frequency converter, control system and power unit - Google Patents
Input active current calculation method of high-voltage frequency converter, control system and power unit Download PDFInfo
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- CN105281579A CN105281579A CN201410353308.4A CN201410353308A CN105281579A CN 105281579 A CN105281579 A CN 105281579A CN 201410353308 A CN201410353308 A CN 201410353308A CN 105281579 A CN105281579 A CN 105281579A
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Abstract
The application discloses an input active current calculation method of a high-voltage frequency converter power unit. The method comprises obtaining running information of unit serial-connection type high-voltage frequency converter, wherein the running information comprises a power network voltage, a frequency converter whole-machine output current and output voltage modulation information of the power unit, obtaining an input voltage of the power unit through a calculation according to the power network voltage, obtaining an output voltage of the power unit through a calculation according to the output voltage modulation information, and obtaining an input active current of the power unit through a calculation according to the frequency converter whole-machine output current, the input voltage and the output voltage, so calculation accuracy of the input active current of the power unit is improved. Furthermore, the application further discloses a high-voltage frequency converter and a control system thereof.
Description
Technical field
The present invention relates to electric and electronic technical field, more particularly, relate to a kind of input active current computational methods of high voltage transducer power unit, high voltage converter and control system thereof.
Background technology
The topological structure that the power cell of unit cascade type high voltage frequency changer generally adopts three-phase input single-phase to export, as shown in Figure 1.The instantaneous output that this topological structure determines power cell is fluctuation, the object improving systematic function just must can be reached by the busbar voltage of firm power unit, meanwhile, also fluctuate according to the input active current of the known power cell of active power conservation is inevitable thereupon.
Because the input active current of power cell exists fluctuation, therefore PWM (PulseWidthModulation is being carried out to power cell, pulse width modulation) when controlling, need to set up using the input active current of power cell as feedforward, export the Double Loop Control System as feedback, to improve system response time and control performance using the busbar voltage of power cell simultaneously.
The busbar voltage of power cell directly can be measured and obtain, and the input active current of power cell can only by calculating, and existing computational methods are as follows:
Method 1: by detecting input voltage, the electric current of each power cell, calculates its input active current.But, frequency converter has the phase shifting transformer be connected between electrical network and power cell, when frequency converter runs, the leakage inductance (in Fig. 1, Lr, Ls, Lt are phase shifting transformer secondary side equivalence leakage inductance) that described phase shifting transformer secondary side exists can reduce the certainty of measurement of described input voltage, causes the accuracy in computation of described input active current lower.
Method 2: by detecting output voltage, the electric current of each power cell, calculates its input active current.But power cell outlet side carrier frequency is large compared with low, harmonic wave of output voltage, cannot ensure the certainty of measurement of described output voltage, the accuracy in computation of described input active current can be caused equally lower at all.
Therefore, how to improve the accuracy in computation of the input active current of power cell, become those skilled in the art's problem demanding prompt solution.
Summary of the invention
In view of this, the invention provides a kind of input active current computational methods of high voltage transducer power unit, high voltage converter and control system thereof, to improve the accuracy in computation of the input active current of unit cascade type high voltage frequency changer power cell.
Input active current computational methods for high voltage transducer power unit, comprising:
The operation information of acquiring unit tandem type high voltage converter, described operation information comprises the output voltage modulation intelligence of line voltage, frequency converter complete machine output current and power cell;
According to described line voltage, calculate the input voltage of described power cell;
According to described output voltage modulation intelligence, calculate the output voltage of described power cell;
According to described frequency converter complete machine output current, described input voltage and described output voltage, calculate the input active current of described power cell.
Wherein, described according to described line voltage, calculate the input voltage of described power cell, comprising:
Adopt formula E
uint=E
net/ k
trans, calculate the input voltage of described power cell; In formula, E
uintfor the input voltage of described power cell, E
netfor described line voltage, k
transfor the phase shifting transformer no-load voltage ratio of described frequency converter.
Alternatively, before the operation information of described acquiring unit tandem type high voltage converter, also comprise:
Obtain line voltage when described frequency converter is shut down and the input voltage of power cell;
Line voltage when shutting down according to described frequency converter and the input voltage of power cell, calculate the phase shifting transformer no-load voltage ratio of described frequency converter.
Wherein, the input voltage of described line voltage when shutting down according to described frequency converter and power cell, calculates the phase shifting transformer no-load voltage ratio of described frequency converter, comprising:
Adopt formula k
trans=E '
net/ E '
uint, calculate the phase shifting transformer no-load voltage ratio of described frequency converter; In formula, E '
netfor line voltage when described frequency converter is shut down, k
transfor described phase shifting transformer no-load voltage ratio, E '
uintfor the input voltage of power cell when described frequency converter is shut down.
Wherein, described according to described output voltage modulation intelligence, calculate the output voltage of described power cell, comprising:
Adopt formula U
out=U
dc* (2*usCurPWMValue-usCarrFreqMax)/usCarrFreqMax, calculates the output voltage of described power cell; In formula, U
outfor the output voltage of described power cell, U
dcfor the busbar voltage of described power cell, usCurPWMValue is described output voltage modulation intelligence, and usCarrFreqMax is clock counter value corresponding to modulating wave cycle.
Wherein, described output voltage modulation intelligence is: the output voltage modulation intelligence of any one IGBT during described power cell H bridge exports.
Wherein, described according to described frequency converter complete machine output current, described input voltage and described output voltage, calculate the input active current of described power cell, comprising:
Adopt formula i
d=2*U
out* I
out* cos θ/3*E
uint, calculate the input active current of described power cell; In formula, i
dfor the input active current of described power cell, U
outfor described output voltage, I
outfor described frequency converter complete machine output current, cos θ is output power factor, E
uintfor described input voltage.
A kind of PWM Generator High Voltage Inverter Control System, comprise master board and power unit control plate, wherein, described power unit control plate comprises logic controller and digital signal processor, and described logic controller is connected between described master board and described digital signal processor;
Described master board is used for, line voltage when acquiring unit tandem type high voltage converter runs and frequency converter complete machine output current, and is issued to described logic controller;
Described logic controller is used for, and obtains the output voltage modulation intelligence of power cell when described unit cascade type high voltage frequency changer runs; Described output voltage modulation intelligence, described line voltage and described frequency converter complete machine output current are sent to described digital signal processor;
Described digital signal processor is used for, and according to described line voltage, calculates the input voltage of described power cell; According to described output voltage modulation intelligence, calculate the output voltage of described power cell; According to described frequency converter complete machine output current, described input voltage and described output voltage, calculate the input active current of described power cell.
Alternatively, described master board also for, obtain line voltage when described frequency converter is shut down and the input voltage of power cell;
Described logic controller also for, the input voltage of described line voltage and described power cell is sent to described digital signal processor;
Described digital signal processor also for, according to the input voltage of described line voltage and described power cell, calculate the phase shifting transformer no-load voltage ratio of described frequency converter.
A kind of high voltage converter, is characterized in that, comprise any one PWM Generator High Voltage Inverter Control System above-mentioned.
As can be seen from above-mentioned technical scheme, first the present invention calculates the input voltage of transducer power unit according to the measured value of line voltage, and calculates the output voltage of transducer power unit according to the output voltage modulation intelligence of transducer power unit; Afterwards, then according to the measured value of above-mentioned calculated value and frequency converter complete machine output current, utilize active power conservation principle, calculate the input active current of transducer power unit.Compared to prior art, the present invention adopts account form to obtain the input and output voltage of transducer power unit, and value is more accurate, and then improves the accuracy in computation of input active current of transducer power unit.In addition, because the present invention only relates to the measurement of busbar voltage and frequency converter complete machine output current, at all without the need to carrying out voltage, current measurement separately for each transducer power unit, because this reducing system hardware cost.
Accompanying drawing explanation
In order to be illustrated more clearly in the embodiment of the present invention or technical scheme of the prior art, be briefly described to the accompanying drawing used required in embodiment or description of the prior art below, apparently, accompanying drawing in the following describes is only embodiments of the invention, for those of ordinary skill in the art, under the prerequisite not paying creative work, other accompanying drawing can also be obtained according to the accompanying drawing provided.
The power cell topological structure schematic diagram of Fig. 1 a kind of unit cascade type high voltage frequency changer disclosed in prior art;
The input active current computational methods flow chart of Fig. 2 a kind of high voltage transducer power unit disclosed in the embodiment of the present invention one;
Fig. 3 is a kind of PWM Generator High Voltage Inverter Control System structural representation disclosed in the embodiment of the present invention two.
Embodiment
Below in conjunction with the accompanying drawing in the embodiment of the present invention, be clearly and completely described the technical scheme in the embodiment of the present invention, obviously, described embodiment is only the present invention's part embodiment, instead of whole embodiments.Based on the embodiment in the present invention, those of ordinary skill in the art, not making the every other embodiment obtained under creative work prerequisite, belong to the scope of protection of the invention.
Embodiment one:
See Fig. 2, the embodiment of the present invention one discloses a kind of input active current computational methods of high voltage transducer power unit, to improve the accuracy in computation of the input active current of unit cascade type high voltage frequency changer power cell, comprising:
Step 201: the operation information of acquiring unit tandem type high voltage converter, described operation information comprises the output voltage modulation intelligence of line voltage, frequency converter complete machine output current and power cell;
Step 202: according to described line voltage, calculates the input voltage of described power cell.
Step 203: according to described output voltage modulation intelligence, calculate the output voltage of described power cell;
Step 204: according to described frequency converter complete machine output current, described input voltage and described output voltage, calculate the input active current of described power cell.
First the present embodiment calculates the input voltage of power cell according to the measured value of line voltage, and calculates the output voltage of power cell according to the output voltage modulation intelligence of power cell; Afterwards, then according to the measured value of above-mentioned calculated value and frequency converter complete machine output current, utilize active power conservation principle, calculate the input active current of power cell.Compared to prior art, the present embodiment directly measures line voltage and frequency converter complete machine output current, and adopting account form to obtain the input and output voltage of power cell, value is more accurate, and then improves the accuracy in computation of input active current of described power cell; And, because the present embodiment is without the need to carrying out voltage, current measurement separately for each transducer power unit, and only need one-shot measurement busbar voltage and frequency converter complete machine output current, the input active current of each power cell can be calculated, therefore greatly reduce system hardware cost.
For ease of those skilled in the art's easy understand and application this programme, below the technical scheme described in the present embodiment one is described in detail.
1) about step 201
Each several power cell that have been in series of unit cascade type high voltage frequency changer, every phase output current of frequency converter complete machine is identical with the output current of the power cell being connected on this phase.Based on this design feature, the present embodiment obtains the output current of the power cell of corresponding phase by directly obtaining frequency converter complete machine output current, and without the need to arranging separately output current detection circuit for each power cell, thus greatly reduce system hardware cost.Moreover, the present embodiment does not relate to the detection of power cell output voltage, input voltage and input current, therefore also without the need to setting up corresponding output voltage detecting circuit, input voltage detection circuit and input electric cur-rent measure circuit for each power cell, therefore reduce further system hardware cost.
On the transmission path of described operation information, the hardware structure of the present embodiment direct range site tandem type PWM Generator High Voltage Inverter Control System, and only the improvement on software is carried out to it.Specific as follows:
Known units tandem type PWM Generator High Voltage Inverter Control System comprises master board and power unit control plate; Described power unit control plate is arranged for each power cell one_to_one corresponding, comprises logic control circuit and digital signal processor; Wherein said logic control circuit is by optical fiber and described master board communication and by dual port RAM and described digital signal processor communication;
Based on this, in the present embodiment, described line voltage and described frequency converter complete machine output current are directly obtained by master board, and are forwarded to digital signal processor through the logic control circuit of corresponding phase; The output voltage modulation intelligence of described power cell is stored in described logic control circuit inside, without the need to extra collection, can directly be sent to described digital signal processor.
2) about step 202
Unit cascade type high voltage frequency changer has phase shifting transformer, and the primary side of described phase shifting transformer gets access to grid, secondary side joint power cell.The primary side voltage of described phase shifting transformer equals line voltage, directly can measure and obtain; The secondary side voltage of described phase shifting transformer equals the input voltage of power cell, but because the secondary side of phase shifting transformer exists leakage inductance, when frequency converter runs, the input current of power cell can flow through leakage inductance and produce pressure drop, therefore the actual secondary side voltage obtained measured value and be not equal to actual value in fact, in background technology, method 1 exists and is also this compared with the reason of big error.
For solving this problem, the present embodiment adopts the mode calculated to obtain the input voltage of accurate power cell.Corresponding account form is:
Adopt formula E
uint=E
net/ k
trans, calculate the input voltage of described power cell;
In formula, E
uintfor the input voltage of described power cell, E
netfor described line voltage, k
transfor the phase shifting transformer no-load voltage ratio of described frequency converter;
In above formula, described line voltage accurately obtains by the mode measured, and described phase shifting transformer no-load voltage ratio is fixed value, and thus, the input voltage of the described power cell calculated is more accurate.
Wherein, the phase shifting transformer no-load voltage ratio k of described frequency converter
transobtain by account form, be specially:
Before described frequency converter runs, obtain the input voltage of line voltage when described frequency converter is shut down and power cell; Afterwards, according to the input voltage of described line voltage and described power cell, the phase shifting transformer no-load voltage ratio of described frequency converter is calculated.Corresponding computing formula is k
trans=E '
net/ E '
uint(when described frequency converter is shut down; the input current of transducer power side unit is very little almost nil; now engineering can be ignored the impact that the input voltage of phase shifting transformer secondary side leakage inductance on power cell causes; therefore; when described frequency converter is shut down, the measured value of the actual secondary side voltage obtained just equals its actual value); in formula, E '
netfor line voltage when described frequency converter is shut down, k
transfor described phase shifting transformer no-load voltage ratio, E '
uintfor the input voltage of power cell when described frequency converter is shut down.
3) about step 203
The output voltage of described power cell is for obtain by account form, and value is more accurate, and corresponding account form is specific as follows:
Adopt formula U
out=U
dc* (2*usCurPWMValue-usCarrFreqMax)/usCarrFreqMax, calculates the output voltage of described power cell;
In formula, U
outfor the output voltage of described power cell, U
dcfor the busbar voltage of described power cell, usCurPWMValue is described output voltage modulation intelligence (specifically referring to the clock counter value that PWM comparison point is corresponding), and usCarrFreqMax is clock counter value corresponding to modulating wave cycle.UsCurPWMValue and usCarrFreqMax directly can read and obtain from unit cascade type high voltage frequency changer control system.
Wherein, described output voltage modulation intelligence can be the output voltage modulation intelligence of any one IGBT during described power cell H bridge exports.Reason is: although described power cell H bridge exports 4 IGBT (G21, G22, G23 and G24 in Fig. 1), but bridge pulse is complementary up and down, left and right bridge IGBT driving pulse modulating wave differs 180 °, therefore only has the driving pulse of an IGBT to be independently; Utilize this characteristic, as long as aforementioned logic controller issues the output voltage modulation intelligence of an IGBT to digital signal processor.
4) about step 204
The input active power of note power cell is P
in, then P
in=3*E
uint* i
d/ 2 (target output factor is 1); The active power of output of note power cell is P
out, then P
out=U
out* I
out* cos θ;
According to the known P of active power conservation
in=P
out;
Thus, formula i is adopted
d=2*U
out* I
out* cos θ/3*E
uint, the input active current of described power cell can be calculated;
In formula, i
dfor the input active current of described power cell, U
outfor described output voltage, I
outfor described frequency converter complete machine output current, cos θ is output power factor (size of cos θ obtains by the input voltage of power cell, the phase difference calculating of electric current), E
uintfor described input voltage.
As can be seen from 1)-4), compared to prior art, the present embodiment adopts account form to acquire the input and output voltage of power cell, the leakage inductance that its value does not exist by phase shifting transformer secondary side, power cell outlet side carrier frequency is lower, harmonic wave of output voltage is large etc., and factor is disturbed, therefore value is more accurate, accordingly, the accuracy in computation of the input active current of the described power cell calculated according to active power conservation also improves greatly, solves prior art Problems existing; In addition, because the present invention only relates to the measurement of busbar voltage and frequency converter complete machine output current, at all without the need to carrying out voltage, current measurement separately for each transducer power unit, because this reducing system hardware cost.Wherein it should be noted that, the execution sequence between step 202 and step 203 does not limit to, and the present embodiment only there is provided a kind of implementation wherein.
Embodiment two:
See Fig. 3, the embodiment of the present invention two discloses a kind of PWM Generator High Voltage Inverter Control System, be applied to unit cascade type high voltage frequency changer, to improve the accuracy in computation of the input active current of described unit cascade type high voltage frequency changer power cell, comprise master board 100 and power unit control plate 200, wherein:
Power unit control plate 200 comprises logic controller 201 and digital signal processor 202; Logic controller 201 is connected between master board 200 and digital signal processor 202;
Concrete, master board 100 for, line voltage when acquiring unit tandem type high voltage converter runs and frequency converter complete machine output current, and be issued to logic controller 201;
Logic controller 201 for, obtain the output voltage modulation intelligence of power cell when described unit cascade type high voltage frequency changer runs; Described output voltage modulation intelligence, described line voltage and described frequency converter complete machine output current are sent to digital signal processor 202;
Digital signal processor 202 for, according to described line voltage, calculate the input voltage of described power cell; According to described output voltage modulation intelligence, calculate the output voltage of described power cell; According to described frequency converter complete machine output current, described input voltage and described output voltage, calculate the input active current of described power cell.
More preferred, master board 100 also for, obtain line voltage when described frequency converter is shut down and the input voltage of power cell;
Logic controller 201 also for, the input voltage of described line voltage and described power cell is sent to digital signal processor 202;
Digital signal processor 202 also for, according to the input voltage of described line voltage and described power cell, calculate the phase shifting transformer no-load voltage ratio of described frequency converter.
As can be seen from embodiment two, the hardware structure of the direct range site tandem type PWM Generator High Voltage Inverter Control System of the present embodiment two, only the improvement on software is carried out to it, achieve the accurate Calculation to power cell input active current, and reduce system hardware cost.For unit cascade type high voltage frequency changer control system disclosed in the present embodiment two, active current computational methods are inputted corresponding because itself and embodiment one are disclosed, so description is fairly simple, relevant part is see the related description of an embodiment part.
In addition, the present embodiment also discloses a kind of unit cascade type high voltage frequency changer comprising any one PWM Generator High Voltage Inverter Control System above-mentioned.
In sum, first the present invention calculates the input voltage of power cell according to the measured value of line voltage, and calculates the output voltage of power cell according to the output voltage modulation intelligence of power cell; Afterwards, then according to the measured value of above-mentioned calculated value and frequency converter complete machine output current, utilize active power conservation principle, calculate the input active current of power cell.Compared to prior art, the present invention adopts account form to obtain the input and output voltage of power cell, and value is more accurate, and then improves the accuracy in computation of input active current of described power cell.In addition, because the present invention only relates to the measurement of busbar voltage and frequency converter complete machine output current, at all without the need to carrying out voltage, current measurement separately for each transducer power unit, because this reducing system hardware cost.
To the above-mentioned explanation of the disclosed embodiments, professional and technical personnel in the field are realized or uses the present invention.To be apparent for those skilled in the art to the multiple amendment of these embodiments, General Principle as defined herein can without departing from the spirit or scope of the present invention, realize in other embodiments.Therefore, the present invention can not be restricted to these embodiments shown in this article, but will meet the widest scope consistent with principle disclosed herein and features of novelty.
Claims (10)
1. input active current computational methods for high voltage transducer power unit, is characterized in that, comprising:
The operation information of acquiring unit tandem type high voltage converter, described operation information comprises the output voltage modulation intelligence of line voltage, frequency converter complete machine output current and power cell;
According to described line voltage, calculate the input voltage of described power cell;
According to described output voltage modulation intelligence, calculate the output voltage of described power cell;
According to described frequency converter complete machine output current, described input voltage and described output voltage, calculate the input active current of described power cell.
2. input active current computational methods according to claim 1, is characterized in that, described according to described line voltage, calculate the input voltage of described power cell, comprising:
Adopt formula E
uint=E
net/ k
trans, calculate the input voltage of described power cell;
In formula, E
uintfor the input voltage of described power cell, E
netfor described line voltage, k
transfor the phase shifting transformer no-load voltage ratio of described frequency converter.
3. input active current computational methods according to claim 2, is characterized in that, before the operation information of described acquiring unit tandem type high voltage converter, also comprise:
Obtain line voltage when described frequency converter is shut down and the input voltage of power cell;
Line voltage when shutting down according to described frequency converter and the input voltage of power cell, calculate the phase shifting transformer no-load voltage ratio of described frequency converter.
4. input active current computational methods according to claim 3, is characterized in that, the input voltage of described line voltage when shutting down according to frequency converter and power cell, calculates the phase shifting transformer no-load voltage ratio of described frequency converter, comprising:
Adopt formula k
trans=E '
net/ E '
uint, calculate the phase shifting transformer no-load voltage ratio of described frequency converter;
In formula, E '
netfor line voltage when described frequency converter is shut down, k
transfor described phase shifting transformer no-load voltage ratio, E '
uintfor the input voltage of power cell when described frequency converter is shut down.
5. input active current computational methods according to claim 1, is characterized in that, described according to described output voltage modulation intelligence, calculate the output voltage of described power cell, comprising:
Adopt formula U
out=U
dc* (2*usCurPWMValue-usCarrFreqMax)/usCarrFreqMax, calculates the output voltage of described power cell;
In formula, U
outfor the output voltage of described power cell, U
dcfor the busbar voltage of described power cell, usCurPWMValue is described output voltage modulation intelligence, and usCarrFreqMax is clock counter value corresponding to modulating wave cycle.
6. input active current computational methods according to claim 5, is characterized in that, described output voltage modulation intelligence is: the output voltage modulation intelligence of any one IGBT during described power cell H bridge exports.
7. input active current computational methods according to claim 1, is characterized in that, described according to described frequency converter complete machine output current, described input voltage and described output voltage, calculate the input active current of described power cell, comprising:
Adopt formula i
d=2*U
out* I
out* cos θ/3*E
uint, calculate the input active current of described power cell;
In formula, i
dfor the input active current of described power cell, U
outfor described output voltage, I
outfor described frequency converter complete machine output current, cos θ is output power factor, E
uintfor described input voltage.
8. a PWM Generator High Voltage Inverter Control System, is characterized in that, comprises master board and power unit control plate, wherein, described power unit control plate comprises logic controller and digital signal processor, and described logic controller is connected between described master board and described digital signal processor
Described master board is used for, line voltage when acquiring unit tandem type high voltage converter runs and frequency converter complete machine output current, and is issued to described logic controller;
Described logic controller is used for, and obtains the output voltage modulation intelligence of power cell when described unit cascade type high voltage frequency changer runs; Described output voltage modulation intelligence, described line voltage and described frequency converter complete machine output current are sent to described digital signal processor;
Described digital signal processor is used for, and according to described line voltage, calculates the input voltage of described power cell; According to described output voltage modulation intelligence, calculate the output voltage of described power cell; According to described frequency converter complete machine output current, described input voltage and described output voltage, calculate the input active current of described power cell.
9. PWM Generator High Voltage Inverter Control System according to claim 8, is characterized in that, described master board also for, obtain line voltage when described frequency converter is shut down and the input voltage of power cell;
Described logic controller also for, the input voltage of described line voltage and described power cell is sent to described digital signal processor;
Described digital signal processor also for, according to the input voltage of described line voltage and described power cell, calculate the phase shifting transformer no-load voltage ratio of described frequency converter.
10. a high voltage converter, is characterized in that, comprises the PWM Generator High Voltage Inverter Control System described in claim 8 or 9.
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| CN108696220A (en) * | 2018-04-25 | 2018-10-23 | 宁波高悦电机技术有限公司 | A kind of evaluation method of electronic water pump for automobile operating current |
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