CN104506032A - Intelligent starting method aiming at output stage of testing device for distributed generation grid-connected inverter - Google Patents
Intelligent starting method aiming at output stage of testing device for distributed generation grid-connected inverter Download PDFInfo
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- CN104506032A CN104506032A CN201410816607.7A CN201410816607A CN104506032A CN 104506032 A CN104506032 A CN 104506032A CN 201410816607 A CN201410816607 A CN 201410816607A CN 104506032 A CN104506032 A CN 104506032A
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M1/00—Details of apparatus for conversion
- H02M1/36—Means for starting or stopping converters
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Abstract
The invention discloses an intelligent starting method aiming at an output stage of a testing device for a distributed generation grid-connected inverter; the intelligent starting method aims at providing necessary preparatory work for normal operation of the testing device for the distributed generation grid-connected inverter at air temperature and a special environment. The intelligent starting method disclosed by the invention comprises the following steps of performing sensor fluctuating automatic correction, performing feedback channel gain automatic correction and starting closed-loop control at lowest frequency required by a system so as to obtain the largest effective value computing window, thus, a guarantee is provided for changing output voltage frequency on line. According to the intelligent starting method disclosed by the invention, a sensor fluctuating automatic correction algorithm and a feedback channel gain automatic correction algorithm are started in sequence according to a time sequence, and the closed-loop control is started at the lowest frequency required by the system, and therefore the goal that system parameters are corrected is achieved, and the normal operation of the system is ensured; the intelligent starting method disclosed by the invention has the characteristics of being clear in logic, simple and easy in operation, high in correction precision, and the like, has a practical application value, and is especially suitable for practical industrial application occasions.
Description
Technical field
The invention belongs to technical field of new energies, in particular to a kind of intelligent starting method for distributed power generation grid-connected converter testing apparatus output stage, for ensureing the preparation that the normal operation of distributed power generation grid-connected converter testing apparatus under special temperature and particular surroundings provides necessary.
Background technology
Along with photovoltaic power generation grid-connecting technology, the development of the new energy technologies such as wind power-generating grid-connected technology and fuel cell, renewable energy power generation shared proportion in whole world generating composition grows with each passing day.Along with the surge of the distributed power generation based on regenerative resource in power industry, the stability problem of distributed generation system becomes more and more outstanding, especially when distributed generation system be in be incorporated into the power networks pattern time.Distributed power generation grid-connected converter testing apparatus based on cascaded H-bridges topology can be tested the electrical network adaptive capacity of distributed power generation grid-connected converter, after input stage DC bus-bar voltage is stable, the test voltage based on the closed-loop control of sliding window effective value is adopted to generate unified control method to output stage, can generate the voltage of amplitude frequency change, three-phase imbalance voltage and fluctuation voltage are assessed electric network fault adaptive capacity in various degree distributed power generation grid-connected converter.But, because distributed generation system is generally all in the more severe place of climatic environment, such as cold northern wind energy turbine set, or photovoltaic generation field, desert of high temperature etc., therefore voltage sensor is very easy to be subject to extreme temperature, the impact of humid climate and dry climate, causes the drift value of voltage sensor excessive, and this can bring problem to closed-loop control system; Simultaneously because distributed power generation grid-connected converter testing apparatus is often tested the distributed power generation occasion of high-tension high-power, therefore the gain of sampling channel also can be larger, which results in sampling channel and have a bit little variation a little, the huge variation of final output voltage will be caused; Add the length of window problem that sliding window effective value closed loop feedback controls, just need to add intelligent starting link in the Booting sequence of distributed power generation grid-connected converter testing apparatus output stage, for ensureing that distributed power generation grid-connected converter testing apparatus normal operation under special temperature and particular surroundings provides necessary preparation.
Summary of the invention
The object of the invention is to, for distributed power generation grid-connected converter testing apparatus normal operation under special temperature and particular surroundings provides necessary preparation, provide a kind of intelligent starting method for distributed power generation grid-connected converter testing apparatus output stage.
For achieving the above object, the present invention is achieved through the following technical solutions:
For the intelligent starting method of distributed power generation grid-connected converter testing apparatus output stage, to the distributed power generation grid-connected converter testing apparatus based on cascaded H-bridges topology, comprise rectification input stage and three cascaded H-bridges current transformer composition inversion output stages of three-phase PWM current transformer composition, and form three-phase voltage system, export test voltage, by adopting d-q reference synchronization coordinate system current decoupled control, the input stage be made up of 3N group three-phase PWM current transformer provides stable DC bus-bar voltage for cascaded H-bridges output stage, output stage adopts the closed-loop control of sliding window effective value to provide test voltage, the closed-loop control of sliding window effective value is realized by digitial controller, normally start complete in input stage, when output stage not yet starts, run intelligent starting method, comprise the following steps:
For distributed power generation grid-connected converter testing apparatus, be first that cooling blower system starts, being secondly that input stage starts to start, is that output stage starts again; Wherein, input stage setting up procedure comprises: the soft start that diode uncontrollable rectifier circuit is auxiliary, grid-connected breaker closing, open the pulse of three-phase PWM current transformer, carry out DC bus voltage stabilizing, DC bus-bar voltage slowly increases according to slope instruction, reaches DC bus-bar voltage stationary value;
After DC bus-bar voltage is set up, output stage starts to start, enter intelligent starting flow process: be first voltage sensor drift automatic calibration link, cascaded H-bridges current transformer sampling phase shift carrier modulation, under opened loop control, the cascaded H-bridges current transformer modulation degree of every phase is set to 0, opens pulse, length of holding time is t
1, because cascaded H-bridges current transformer modulation degree is 0, therefore its output voltage is also now null, and the magnitude of voltage that now voltage sensor samples is voltage sensor sampling drift value m, at t
1the interlude of time to be averaged value calculating to voltage sensor sampling drift value, obtains its mean value
at t
1after time terminates, put flag bit 1;
Secondly, flag bit 1 time, enter feedback path automatic gain correction link, under opened loop control, the cascaded H-bridges current transformer modulation degree of every phase is set to certain fixed value, this modulation degree fixed value makes output voltage amplitude be between the 85%-95% of rated output voltage amplitude, and length of holding time is t
2, at t
2the voltage effective value that theoretical output voltage effective value under this fixed value and actual samples obtain is done ratio by the interlude of time, obtains a ratio coefficient p, and simultaneously at this t
2the interlude of time is averaged to this ratio coefficient p, obtains
at t
1+ t
2after time terminates, put flag bit 2;
Again, flag bit 2 times, enter low-limit frequency and start link, test voltage set of frequency output stage exported is the minimum voltage frequency f that system requirements exports
min, carry out the closed-loop control of sliding window effective value, length of holding time is t
3, exporting test voltage amplitude slowly increases, at t according to slope instruction
1+ t
2+ t
3after time terminates, put flag bit 3;
Finally, flag bit 3 times, read the test voltage set point that backstage issues, enter normal effective value closed-loop control link, distributed power generation grid-connected converter testing apparatus output stage starts normal operation, exports test voltage.
The present invention further improves and is, flag bit 3 times, the magnitude of voltage that obtains of being sampled by voltage sensor all deducts the mean value of voltage sensor sampling drift value
then voltage sensor sampling drift is corrected.
The present invention further improves and is, flag bit 3 times, voltage effective value actual samples obtained is multiplied by ratio coefficient mean value
using this product as the voltage effective value being used for the closed-loop control of sliding window effective value, then feedback path gain is corrected.
The present invention further improves and is, control frequency and the sample frequency of digitial controller are f
k, the ceiling voltage frequency that system requirements exports is f
max, then the length of window that now sliding window effective value calculates is
individual sampled point, and when exporting test voltage set of frequency and being the ceiling voltage frequency of system requirements output, length of window is
individual sampled point, so the length of window that sliding window effective value calculates is according to the difference exporting test voltage frequency,
with
between change.
Compared with prior art, the present invention has following useful technique effect:
The present invention provides necessary preparation for the normal operation of distributed power generation grid-connected converter testing apparatus under special temperature and particular surroundings, comprise voltage sensor drift automatic calibration, feedback path automatic gain correction and with the low-limit frequency of system requirements start closed-loop control, to obtain maximum effective value calculation window, give security for changing output voltage frequency online.Intelligent starting method of the present invention ensure that the normal operation of distributed power generation grid-connected converter testing apparatus under special temperature and particular surroundings, there is clear logic, simple to operation, calibration accuracy high feature, and there is actual application value, be specially adapted to practical application in industry occasion.
Further, be with the meaning that minimum voltage frequency starts, when distributed power generation grid-connected converter testing apparatus needs online change to export test voltage frequency, now data are filled with in maximum sliding window effective value calculation window, when frequency is by high step-down, the sliding window effective value calculation window sampled point newly increased is not for empty, what which ensure that sliding window effective value calculates seamlessly transits, if do not started with low-limit frequency, so when online by high frequency step-down frequency, the sliding window effective value calculation window sampled point newly increased is for empty, this sudden change that sliding window effective value can be caused to calculate, cause the vibration of closed loop controller, then overvoltage or over current fault is caused.
Accompanying drawing explanation
Fig. 1 is the distributed power generation grid-connected converter testing apparatus structure chart based on cascaded H-bridges current transformer;
Fig. 2 is the phase shift carrier modulation principle figure for cascaded H-bridges current transformer, and wherein cascaded H-bridges number of modules is 3;
Fig. 3 is the test voltage generation unified control method theory diagram based on the closed-loop control of sliding window effective value;
Fig. 4 is the intelligent starting method time shaft figure for distributed power generation grid-connected converter testing apparatus output stage;
Fig. 5 is DC bus-bar voltage and the output stage output voltage waveforms of distributed power generation grid-connected converter testing apparatus start-up course.
Embodiment
Below in conjunction with instantiation and accompanying drawing, the present invention will be further described in detail, and the explanation of the invention is not limited.
Be specifically described for the distributed power generation grid-connected converter testing apparatus based on cascaded H-bridges current transformer as shown in Figure 1.Testing apparatus shown in Fig. 1 is divided into two parts, and a part is input stage, is made up of input transformer and three-phase PWM current transformer independently; A part is output stage, is made up of output transformer and cascaded H-bridges current transformer, often comprises a cascaded H-bridges current transformer mutually, and combination forms three-phase output voltage.In input stage, the Industrial Frequency Transformer of secondary Multiple coil provides the input voltage of isolation mutually for three-phase PWM current transformer.Each three-phase PWM current transformer is controlled by a FPGA+DSP combined controller, and DSP is responsible for control algolithm, and FPGA is responsible for the modulation (i.e. the generation of pulse signal) of data processing and current transformer.Feedback signal is sampled by AD conversion chip, is then transferred to FPGA.DC bus-bar voltage is maintained by using d-q reference synchronization coordinate system current decoupled control.In output stage, be often composed in series by N number of H bridge, N is determined by line voltage and distributed generation system port voltage, and same, DC bus-bar voltage is also like this.Output port is by Y-connection, and DSP+FPGA controller is the unique controller of output stage, and same, DSP is responsible for control algolithm, and FPGA is responsible for the modulation (i.e. the generation of pulse signal) of data processing and current transformer.
For above-mentioned testing apparatus, d-q reference synchronization coordinate system current decoupled control is adopted to provide stable DC bus-bar voltage, after DC bus-bar voltage is set up, phase-splitting is carried out to cascaded H-bridges current transformer and independently controls, three cascaded H-bridges current transformers are controlled as single-phase electricity potential source type inverter.Three cascaded H-bridges output voltages form three-phase voltage system, and carry out phase shift carrier modulation (Phase shifted carrier PWM, PSC-PWM) to each cascaded H-bridges.Phase shift carrier modulation principle figure as shown in Figure 2.Then use phase-splitting independently voltage reference signal, adopt the test voltage based on the closed-loop control of sliding window effective value to generate unified control method to each cascaded H-bridges, as shown in Figure 3.
It is as follows that distributed power generation grid-connected converter testing apparatus starts sequential:
First be that cooling blower system starts, next is that input stage starts to start, that output stage starts again, wherein input stage setting up procedure comprises: soft start, grid-connected breaker closing, opens the pulse of three-phase PWM current transformer, carries out DC bus voltage stabilizing, DC bus-bar voltage slowly increases according to slope instruction, reaches DC bus-bar voltage stationary value;
After DC bus-bar voltage is set up, output stage starts to start, enter intelligent starting flow process: be first voltage sensor drift automatic calibration link, cascaded H-bridges current transformer sampling phase shift carrier modulation, under opened loop control, the cascaded H-bridges current transformer modulation degree of every phase is set to 0, opens pulse, length of holding time is t
1, because cascaded H-bridges current transformer modulation degree is 0, therefore its output voltage is also now null, and the magnitude of voltage that now voltage sensor samples is voltage sensor sampling drift value m, at t
1the interlude of time to be averaged value calculating to voltage sensor sampling drift value, obtains its mean value
at t
1after time terminates, put flag bit 1;
Secondly, flag bit 1 time, enter feedback path automatic gain correction link, under opened loop control, the modulation degree of the cascaded H-bridges current transformer of every phase is set to certain fixed value, length of holding time is t
2, at t
2the voltage effective value that theoretical output voltage effective value under this fixed value and actual samples obtain is done ratio by the interlude of time, obtains a ratio coefficient p, and simultaneously at this t
2the interlude of time is averaged to this ratio coefficient p, obtains
at t
1+ t
2after time terminates, put flag bit 2; Again, flag bit 2 times, enter low-limit frequency and start link, test voltage set of frequency output stage exported is the minimum voltage frequency f that system requirements exports
min, carry out the closed-loop control of sliding window effective value, length of holding time is t
3, exporting test voltage amplitude slowly increases, at t according to slope instruction
1+ t
2+ t
3after time terminates, put flag bit 3; Finally, flag bit 3 times, read the test voltage set point that backstage issues, enter normal effective value closed-loop control link, distributed power generation grid-connected converter testing apparatus output stage starts normal operation, exports test voltage.
Flag bit 3 times, the magnitude of voltage that obtains of being sampled by voltage sensor all deducts the mean value of voltage sensor sampling drift value
then voltage sensor sampling drift is corrected; Voltage effective value actual samples obtained is multiplied by ratio coefficient mean value
using this product as the voltage effective value being used for the closed-loop control of sliding window effective value, then feedback path gain is corrected.
Suppose that control frequency and the sample frequency of digitial controller are f
k, the ceiling voltage frequency that system requirements exports is f
max, then the length of window that now sliding window effective value calculates is
individual sampled point, and when exporting test voltage set of frequency and being the ceiling voltage frequency of system requirements output, length of window is
individual sampled point, so the length of window that sliding window effective value calculates is according to the difference exporting test voltage frequency,
with
between change, obviously, have
be with the meaning that minimum voltage frequency starts, when distributed power generation grid-connected converter testing apparatus needs online change to export test voltage frequency, data are filled with in maximum sliding window effective value calculation window, when frequency is by high step-down, the sliding window effective value calculation window sampled point newly increased is not for empty, what which ensure that sliding window effective value calculates seamlessly transits, if do not started with low-limit frequency, so when online by high frequency step-down frequency, the sliding window effective value calculation window sampled point newly increased is for empty, this sudden change that sliding window effective value can be caused to calculate, cause the vibration of closed loop controller, then overvoltage or over current fault is caused.
Embodiment:
Fig. 4 illustrates the above-mentioned intelligent starting method time shaft figure for distributed power generation grid-connected converter testing apparatus output stage, Fig. 5 is DC bus-bar voltage and the output stage output voltage waveforms of distributed power generation grid-connected converter testing apparatus start-up course, wherein passage 1 is the process of establishing of output stage output voltage, passage 2 is the process of establishing of DC bus-bar voltage, can find out input stage set up DC bus-bar voltage after, the output voltage amplitude of output stage increases gradually under the instruction of slope, finally tends towards stability.Wherein, the control frequency of digitial controller and sample frequency are f
k=12kHz, the time span of each intelligent starting flow process is respectively: t
1=3s, t
2=10s and t
3=10s, the acquiescence output voltage frequency that output stage reads from backstage is 50Hz, the ramp voltage instruction of output stage is increased to rated voltage amplitude 1 from 0 needs 8.33s, in feedback path automatic gain correction link, the modulation degree arranged is 0.7, therefore be increased to 0.7 from 0 and need 8.33*0.7=5.83s, the mean value of calculating sensor sampling drift value between the 2nd second to the 3rd second of voltage sensor drift automatic calibration link, the mean value of ratio calculated coefficient between 9 seconds on earth at the 8th second of feedback path automatic gain correction link.
Claims (4)
1. for the intelligent starting method of distributed power generation grid-connected converter testing apparatus output stage, it is characterized in that, to the distributed power generation grid-connected converter testing apparatus based on cascaded H-bridges topology, comprise rectification input stage and three cascaded H-bridges current transformer composition inversion output stages of three-phase PWM current transformer composition, and form three-phase voltage system, export test voltage, by adopting d-q reference synchronization coordinate system current decoupled control, the input stage be made up of 3N group three-phase PWM current transformer provides stable DC bus-bar voltage for cascaded H-bridges output stage, output stage adopts the closed-loop control of sliding window effective value to provide test voltage, the closed-loop control of sliding window effective value is realized by digitial controller, normally start complete in input stage, when output stage not yet starts, run intelligent starting method, comprise the following steps:
For distributed power generation grid-connected converter testing apparatus, be first that cooling blower system starts, being secondly that input stage starts to start, is that output stage starts again; Wherein, input stage setting up procedure comprises: the soft start that diode uncontrollable rectifier circuit is auxiliary, grid-connected breaker closing, open the pulse of three-phase PWM current transformer, carry out DC bus voltage stabilizing, DC bus-bar voltage slowly increases according to slope instruction, reaches DC bus-bar voltage stationary value;
After DC bus-bar voltage is set up, output stage starts to start, enter intelligent starting flow process: be first voltage sensor drift automatic calibration link, cascaded H-bridges current transformer sampling phase shift carrier modulation, under opened loop control, the cascaded H-bridges current transformer modulation degree of every phase is set to 0, opens pulse, length of holding time is t
1, because cascaded H-bridges current transformer modulation degree is 0, therefore its output voltage is also now null, and the magnitude of voltage that now voltage sensor samples is voltage sensor sampling drift value m, at t
1the interlude of time to be averaged value calculating to voltage sensor sampling drift value, obtains its mean value
at t
1after time terminates, put flag bit 1;
Secondly, flag bit 1 time, enter feedback path automatic gain correction link, under opened loop control, the cascaded H-bridges current transformer modulation degree of every phase is set to certain fixed value, this modulation degree fixed value makes output voltage amplitude be between the 85%-95% of rated output voltage amplitude, and length of holding time is t
2, at t
2the voltage effective value that theoretical output voltage effective value under this fixed value and actual samples obtain is done ratio by the interlude of time, obtains a ratio coefficient p, and simultaneously at this t
2the interlude of time is averaged to this ratio coefficient p, obtains
at t
1+ t
2after time terminates, put flag bit 2;
Again, flag bit 2 times, enter low-limit frequency and start link, test voltage set of frequency output stage exported is the minimum voltage frequency f that system requirements exports
min, carry out the closed-loop control of sliding window effective value, length of holding time is t
3, exporting test voltage amplitude slowly increases, at t according to slope instruction
1+ t
2+ t
3after time terminates, put flag bit 3;
Finally, flag bit 3 times, read the test voltage set point that backstage issues, enter normal effective value closed-loop control link, distributed power generation grid-connected converter testing apparatus output stage starts normal operation, exports test voltage.
2. as claimed in claim 1 for the intelligent starting method of distributed power generation grid-connected converter testing apparatus output stage, it is characterized in that, flag bit 3 times, the magnitude of voltage that obtains of sample by voltage sensor all deducts voltage sensor and to sample the mean value of drift value
then voltage sensor sampling drift is corrected.
3. as claimed in claim 1 for the intelligent starting method of distributed power generation grid-connected converter testing apparatus output stage, it is characterized in that, flag bit 3 times, voltage effective value actual samples obtained is multiplied by ratio coefficient mean value
using this product as the voltage effective value being used for the closed-loop control of sliding window effective value, then feedback path gain is corrected.
4., as claimed in claim 1 for the intelligent starting method of distributed power generation grid-connected converter testing apparatus output stage, it is characterized in that, control frequency and the sample frequency of digitial controller are f
k, the ceiling voltage frequency that system requirements exports is f
max, then the length of window that now sliding window effective value calculates is
individual sampled point, and when exporting test voltage set of frequency and being the ceiling voltage frequency of system requirements output, length of window is
individual sampled point, so the length of window that sliding window effective value calculates is according to the difference exporting test voltage frequency,
with
between change.
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107425545A (en) * | 2017-07-31 | 2017-12-01 | 上海交通大学 | The optimization modulator approach of volage current transformer in cascaded H-bridges |
| CN106130061B (en) * | 2016-06-12 | 2019-06-25 | 湖北追日电气股份有限公司 | A kind of the soft start operating system and method for parallel connection energy storage inverter |
-
2014
- 2014-12-24 CN CN201410816607.7A patent/CN104506032B/en active Active
Non-Patent Citations (1)
| Title |
|---|
| 高志刚，李永东: "一种适用于级联H桥型逆变器的新型PWM脉冲模型", 《中国电机工程学报》 * |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106130061B (en) * | 2016-06-12 | 2019-06-25 | 湖北追日电气股份有限公司 | A kind of the soft start operating system and method for parallel connection energy storage inverter |
| CN107425545A (en) * | 2017-07-31 | 2017-12-01 | 上海交通大学 | The optimization modulator approach of volage current transformer in cascaded H-bridges |
| CN107425545B (en) * | 2017-07-31 | 2019-08-23 | 上海交通大学 | The optimization modulator approach of volage current transformer in cascaded H-bridges |
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