CN104333041A - Control system for low voltage ride through - Google Patents
Control system for low voltage ride through Download PDFInfo
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- CN104333041A CN104333041A CN201410638610.4A CN201410638610A CN104333041A CN 104333041 A CN104333041 A CN 104333041A CN 201410638610 A CN201410638610 A CN 201410638610A CN 104333041 A CN104333041 A CN 104333041A
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J3/00—Circuit arrangements for ac mains or ac distribution networks
- H02J3/38—Arrangements for parallely feeding a single network by two or more generators, converters or transformers
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P80/00—Climate change mitigation technologies for sector-wide applications
- Y02P80/10—Efficient use of energy, e.g. using compressed air or pressurized fluid as energy carrier
- Y02P80/14—District level solutions, i.e. local energy networks
Abstract
The invention discloses a control system for low voltage ride through. The control system comprises a micro-grid and a first grid-connected inverter device. A first distributed power supply and a second distributed power supply are arranged in the micro-grid, and the micro-grid is used for conveying electricity to a main power grid. The first grid-connected inverter device is mainly used for controlling the first distributed power supply and the second distributed power supply to achieve the low voltage ride through function when the main power grid breaks down. The control system solves the problem of the correlation technique of high cost when the micro-grid connects to achieve the low voltage ride through function.
Description
Technical field
The present invention relates to field of power, in particular to a kind of control system for low-voltage crossing.
Background technology
In electric power system, in order to share the pressure of electrical network, need arrange in some specific region distributed power source (as, wind power station, photo-voltaic power generation station, Microturbine, diesel engine generator) and micro-capacitance sensor, wherein, the electric energy produced of distributed power source and micro-capacitance sensor except directly for except user, can also and become owner of electrical network.
But because main electrical network exists unsteadiness (e.g., electric network fault), and this instability easily causes distributed power source and micro-capacitance sensor operation exception, therefore, distributed power source and micro-capacitance sensor, when grid-connected, need to realize low-voltage crossing function.
In the related, to independently distributed power source, inverter is adopted to realize low-voltage crossing function; To micro-capacitance sensor, owing to can comprise multiple distributed power source in micro-capacitance sensor, therefore, when realizing low-voltage crossing function, need to adopt separately independently inverter to each distributed power source in this micro-capacitance sensor, cost is high.And the character of each distributed power source is not quite similar in micro-capacitance sensor, therefore, need to adopt different inverters, cause controlling difficulty large.
Such as, the distributed power source (as photovoltaic, Microturbine, diesel engine generator) of number of different types and energy storage device and load is comprised in micro-capacitance sensor.As a kind of new distribution net, the two-way flow of trend between the main electrical network that micro-capacitance sensor can realize and access.Suppose to comprise ten 50MVA diesel engine generators in a micro-capacitance sensor, so total power generating capacity can reach 500MVA.When main Power grid structure weakness, when the main electrical network of micro-capacitance sensor forward injects 500MW active power, if cut off suddenly because of low voltage failure, then system unstability may be caused.At present, most small distributed power supply (e.g., diesel engine generator) does not have low voltage ride-through function.In the micro-capacitance sensor containing a large amount of distributed power source, if provide low-voltage crossing technology for each distributed power source, cost will be very high.
For in correlation technique when micro-grid connection realizes low-voltage crossing function, the problem that cost is high, not yet proposes effective solution at present.
Summary of the invention
Main purpose of the present invention is to provide a kind of control system for low-voltage crossing, to solve in correlation technique when micro-grid connection realizes low-voltage crossing function, and the problem that cost is high.
To achieve these goals, a kind of control system for low-voltage crossing is provided.This system comprises: micro-capacitance sensor, is provided with the first distributed power source and the second distributed power source in described micro-capacitance sensor, and described micro-capacitance sensor is used for main electrical network transmission of electric energy; And the first parallel network reverse device, for when described main electric network fault, control described first distributed power source in described micro-capacitance sensor and described second distributed power source realizes low-voltage crossing function.
Further, be provided with the 3rd distributed power source in described micro-capacitance sensor, described control system also comprises: the second parallel network reverse device, and for when described main electric network fault, described 3rd distributed power source controlled in described micro-capacitance sensor realizes low-voltage crossing function.
Further, described first distributed power source comprises one or more, and/or described second distributed power source comprises one or more.
Further, described first parallel network reverse device comprises: combining inverter, for being connected with described main electrical network, is provided with and site between described main electrical network and described combining inverter; Controller, be connected with described combining inverter, for gathering described combining inverter in described and on site output signal, and when described main electric network fault, limit the output current of described combining inverter according to the output signal on described in collecting and site.
Further, described controller, also for when described main electric network fault, is described according to the output signal described in collecting and on site and site provides support voltage, and described support voltage is more than or equal to preset value.
Further, described and output signal on site comprises current output signal and voltage output signal, when described main electric network fault, described controller is in the following manner according to collect described and output signal on site is described and site provides support voltage: current phasor corresponding for described current output signal is carried out coordinate transform, obtains the current phasor after converting; Voltage vector corresponding for described voltage output signal is carried out coordinate transform, obtains the voltage vector after converting; Obtain the mapping relations of the current phasor after the power stage vector of described combining inverter and described conversion and the voltage vector after described conversion; Calculate according to the current phasor after described conversion and described mapping relations, obtain the first result of calculation; And be described according to described first result of calculation and site provides support voltage.
Further, described combining inverter is IGBT module, and described first parallel network reverse device also comprises: IGBT drive module, and described IGBT drive module is for driving described IGBT module action.
Further, described first parallel network reverse device also comprises: transducer, is connected between described combining inverter and described controller, and described controller gathers described combining inverter in described and on site output signal by described transducer.
Further, described controller comprises digital signal processor.
Further, described and output signal on site comprises current output signal and voltage output signal, when described main electric network fault, described controller is in the following manner according to collect described and output signal on site limits the output current of described combining inverter: current phasor corresponding for described current output signal is carried out coordinate transform, obtains the current phasor after converting; Voltage vector corresponding for described voltage output signal is carried out coordinate transform, obtains the voltage vector after converting; Obtain the mapping relations of the current phasor after the power stage vector of described combining inverter and described conversion and the voltage vector after described conversion; Calculate according to the current phasor after described conversion and described mapping relations, obtain the second result of calculation; And the output current of described combining inverter is limited according to described second result of calculation.
By the present invention, adopt micro-capacitance sensor, be provided with the first distributed power source and the second distributed power source in micro-capacitance sensor, micro-capacitance sensor is used for main electrical network transmission of electric energy, and the first parallel network reverse device, for when main electric network fault, the first distributed power source in control micro-capacitance sensor and the second distributed power source realize low-voltage crossing function, low-voltage crossing function is realized due to some or all of distributed power source in micro-capacitance sensor can be controlled by a parallel network reverse device, therefore, without the need to arranging separately a parallel network reverse device to each distributed power source, decrease the quantity of parallel network reverse device in control system, save cost, to solve in correlation technique when micro-grid connection realizes low-voltage crossing function, the problem that cost is high, and then reach cost-saving effect.
Accompanying drawing explanation
The accompanying drawing forming a application's part is used to provide a further understanding of the present invention, and schematic description and description of the present invention, for explaining the present invention, does not form inappropriate limitation of the present invention.In the accompanying drawings:
Fig. 1 is the schematic diagram of the control system for low-voltage crossing according to the embodiment of the present invention;
Fig. 2 is the schematic diagram of the parallel network reverse device according to the embodiment of the present invention;
Fig. 3 is the control block diagram for low-voltage crossing according to the embodiment of the present invention;
Voltage, electric current, power waveform figure when Fig. 4 is the main electrical network generation symmetric fault according to the embodiment of the present invention;
Voltage, electric current, power waveform figure when Fig. 5 is the main electrical network generation unbalanced fault according to the embodiment of the present invention;
Fig. 6 is the schematic diagram of the experimental prototype controlled according to the simulation low-voltage crossing of the embodiment of the present invention;
Fig. 7 (a) is combining inverter power output and the output current wave figure of the experimental result of simulation symmetric fault according to Fig. 6;
Fig. 7 (b) is that moment waveform unfolds figure occurs the fault of the experimental result of simulation symmetric fault according to Fig. 6;
Fig. 8 (a) is grid-connected point voltage and the combining inverter power output oscillogram of the experimental result of simulation unbalanced fault according to Fig. 6;
Fig. 8 (b) is that moment waveform unfolds figure occurs the fault of the experimental result of simulation unbalanced fault according to Fig. 6; And
Fig. 8 (c) is that moment combining inverter power output and output current wave expanded view occur the fault of the experimental result of simulation unbalanced fault according to Fig. 6.
Embodiment
It should be noted that, when not conflicting, the embodiment in the application and the feature in embodiment can combine mutually.Below with reference to the accompanying drawings and describe the present invention in detail in conjunction with the embodiments.
Better the present invention program is understood in order to make those skilled in the art, below in conjunction with the accompanying drawing in the embodiment of the present invention, technical scheme in the embodiment of the present invention is clearly and completely described, obviously, described embodiment is only the embodiment of a part of the present invention, instead of whole embodiments.Based on the embodiment in the present invention, the every other embodiment obtained under those of ordinary skill in the art do not make creative work prerequisite, all should belong to protection scope of the present invention.
It should be noted that, term " first ", " second " etc. in specification of the present invention and claims and above-mentioned accompanying drawing are for distinguishing similar object, and need not be used for describing specific order or precedence.Should be appreciated that the data used like this can be exchanged in the appropriate case, so as embodiments of the invention described herein can with except here diagram or describe those except order implement.In addition, term " comprises " and " having " and their any distortion, and intention is to cover not exclusive comprising.
According to embodiments of the invention, provide a kind of control system for low-voltage crossing, this control system being used for low-voltage crossing is for realizing low-voltage crossing function to distributed power source some or all of in micro-capacitance sensor by a parallel network reverse device.
Fig. 1 is the schematic diagram of the control system for low-voltage crossing according to the embodiment of the present invention.As shown in Figure 1, this system comprises: micro-capacitance sensor 10 and the first parallel network reverse device 20.
Micro-capacitance sensor 10 is also micro-power network.In micro-capacitance sensor 10, the first distributed power source and the second distributed power source can be provided with, also, in micro-capacitance sensor 10, multiple distributed power source can be provided with.Micro-capacitance sensor 10 may be used for main electrical network 30 transmission of electric energy, and wherein, main electrical network 30 is main power network, as the circuit part of dotted line frame inside in Fig. 1.Particularly, the electric energy that micro-capacitance sensor 10 produces all directly can be supplied to user and use, or can all be delivered in main electrical network 30, or can use partly directly be supplied to user, partly be delivered in main electrical network 30.
First parallel network reverse device 20 may be used for when main electrical network 30 fault, the first distributed power source in control micro-capacitance sensor 10 and the second distributed power source realize low-voltage crossing function, also be, when main electrical network 30 fault, control the first distributed power source in micro-capacitance sensor 10 and the normal operation of the second distributed power source maintenance.
Pass through the embodiment of the present invention, low-voltage crossing function is realized due to some or all of distributed power source in micro-capacitance sensor can be controlled by a parallel network reverse device, therefore, without the need to arranging separately a parallel network reverse device to each distributed power source, decrease the quantity of parallel network reverse device in control system, reach cost-saving effect.
It should be noted that, in embodiments of the present invention, micro-capacitance sensor is except comprising aforesaid first distributed power source and the second distributed power source, other distributed power source can also be comprised, like this, first parallel network reverse device can be arranged on the first distributed power source, the also site place of the second distributed power source and main electrical network, low-voltage crossing function is realized to the part distributed power source in micro-capacitance sensor, other distributed power source then realizes low-voltage crossing function by other parallel network reverse device, decrease the quantity of parallel network reverse device in control system, reach cost-saving effect.
Such as, if in micro-capacitance sensor except being provided with the first distributed power source and the second distributed power source, be also provided with the 3rd distributed power source, then this control system can also comprise: the second parallel network reverse device.Second parallel network reverse device is used for when main electric network fault, and the 3rd distributed power source controlled in micro-capacitance sensor realizes low-voltage crossing function.
In addition, micro-capacitance sensor can also only comprise: the first distributed power source and the second distributed power source, further, the first distributed power source can comprise one or more distributed power source, and/or the second distributed power source also can comprise one or more distributed power source.Like this, (namely whole control system can only include a parallel network reverse device, first parallel network reverse device), first parallel network reverse device is arranged on the also site place of micro-capacitance sensor and main electrical network, low-voltage crossing function is realized to the whole distributed power sources in whole micro-capacitance sensor, with micro-capacitance sensor except comprising aforesaid first distributed power source and the second distributed power source, the control system that can also comprise other distributed power source is compared, the quantity of parallel network reverse device can be reduced further, and reach cost-saving effect further.
It should be noted that, in embodiments of the present invention, the first distributed power source and the second distributed power source can be the distributed power source of same nature, or can be the distributed power source of not same nature.Such as, the first distributed power source and the second distributed power source can be following distributed power source: wind power station, photo-voltaic power generation station, Microturbine, diesel engine generator.
Pass through the embodiment of the present invention, due to low-voltage crossing function can be realized by a parallel network reverse device to the multiple distributed power sources in micro-capacitance sensor, therefore, can not cause controlling difficulty because of the different in kind of distributed power source large, also namely, the control difficulty of the control system for low-voltage crossing is reduced.
First parallel network reverse device can be a device independently with invert function and controlling functions, and alternatively, the first parallel network reverse device also can be a combination unit, and such as, it can comprise: combining inverter and controller.Wherein, combining inverter is used for being connected with main electrical network, is provided with and site between main electrical network and combining inverter.Controller is connected with combining inverter; may be used for gather combining inverter and site on output signal; and when main electric network fault; according to the output current of the output signal restriction combining inverter on the also site collected, thus combining inverter can be avoided because of overcurrent protection action tripping operation or puncture because of overheated.
Such as, when main electrical grid failure, and micro-capacitance sensor to its transmission of electric energy time, the controller in the first parallel network reverse device can limit the output current of combining inverter effectively, avoid combining inverter because of overcurrent protection action tripping operation or puncture because of overheated.
Further, controller can also be used for when main electric network fault, controls combining inverter output smoothing power according to the output signal on the also site collected.Such as, when three-phase imbalance fault appears in main electrical network, controller can control the power of combining inverter output smoothing.
Further, after main electric network fault is eliminated, controller can also control combining inverter and recover normal operating condition, and export with fault before the active power of equivalent and reactive power, thus it is stable to avoid system to lose.
In addition, electronics or the electric components such as inductance, electric capacity, switch and transformer can also be provided with between main electrical network and combining inverter.
In embodiments of the present invention, controller, except for realizing except above-mentioned functions, can also be used for when main electric network fault, is that also site provides support voltage, supports voltage and be more than or equal to preset value according to the output signal on the also site collected.
Such as, when main electric network fault, and the magnitude of voltage at site place may reduce suddenly, as, this magnitude of voltage may sport 0, now, controller can control combining inverter and export preset value support voltage, causes micro-capacitance sensor normally not run to prevent the magnitude of voltage of grid-connected point too low.
In embodiments of the present invention, the form of combining inverter is not limited.Alternatively, combining inverter can be inverter circuit or IGBT module, and preferably, combining inverter is IGBT module, and now, the first parallel network reverse device can also comprise IGBT drive module, and IGBT drive module is for driving IGBT module action.Adopt IGBT module as combining inverter, the structure of combining inverter can be simplified, and then reduce the volume of combining inverter.
It should be noted that, aforesaid controller can gather voluntarily combining inverter and site on output signal, also can by the transducer of peripheral hardware gather combining inverter and output signal on site, transducer can be arranged in Sensor box, wherein, this transducer may be used for gathering voltage signal and current signal, and also, the first parallel network reverse device can also comprise: transducer.Transducer is connected between combining inverter and controller, controller by transducer gather combining inverter and site on output signal.
Alternatively, controller can comprise digital signal processor DSP, like this, because DSP is programmable digital processor, therefore, under the prerequisite not changing aforesaid parallel network reverse device, can realize controller upgrading, and then realize the upgrading of whole control system.
As shown in Figure 2, aforesaid parallel network reverse device can comprise: IGBT module 202, IGBT drive module 204, DSP206 and Sensor box 208.Wherein, the annexation of all parts is as diagram, and do not repeat them here, it should be noted that, the sample frequency of DSP206 can be 5kHz.
Preferably, aforementioned and output signal on site can comprise: current output signal and voltage output signal.When main electric network fault, controller can by following steps according to collect and site on output signal for and site provide support voltage:
S2, carries out coordinate transform by current phasor corresponding for current output signal, obtains the current phasor after converting.Such as, for three-phase electricity, Clarke transform can be adopted, by formula i
α β 0=Ti
abc(1) current phasor of three-phase electricity is converted to the current phasor under α β 0 coordinate.
S4, carries out coordinate transform by voltage vector corresponding for voltage output signal, obtains the voltage vector after converting.Such as, for three-phase electricity, formula v can be passed through
α β 0=Tv
abc(2) voltage vector of three-phase electricity is converted to the voltage vector under α β 0 coordinate.
Wherein, the T in S2 and S4 is:
S6, obtains the mapping relations of the power stage vector of combining inverter and the current phasor after converting and the voltage vector after converting.Such as, power stage vector can comprise: instantaneous zero sequence active-power P 0, active-power P and reactive power Q, and these power can be expressed as under α β 0 coordinate:
S8, calculates according to the current phasor after conversion and mapping relations, obtains the first result of calculation.Wherein, formula (3), (4) are arranged, draw the reference value of output current under α β 0 coordinate system:
Can find out that active power and reactive power can optionally compensate respectively from formula (5).Under electrical network normal operating condition, the reference value that controller can control the reactive power Q that combining inverter exports is 0, to ensure and the quality of power supply of site and power factor; Under grid fault conditions, controller can control combining inverter output reactive power Q and support grid-connected point voltage, is also site and provides support voltage.
Wherein, i
α β 0 *for results of intermediate calculations, preferably, the output current feedfoward control at also site place can be utilized to improve the dynamic characteristic of system, improve the immunity of control system to interference.Further, can to the combining inverter adoption rate P/ proportional integral PI/ proportion integration differentiation pid control algorithm of micro-capacitance sensor, and utilize the output voltage feedfoward control at also site place to improve the dynamic characteristic of system, improve the immunity of control system to interference.
S10 is that also site provides support voltage according to the first result of calculation.
Preferably, aforementioned and output signal on site can comprise: current output signal and voltage output signal.When main electric network fault, controller is by the output current of following steps according to the output signal restriction combining inverter on the also site collected:
S12 to S16 is identical with aforesaid S2 to S6 respectively, does not repeat them here.
S18, calculates according to the current phasor after conversion and mapping relations, obtains the second result of calculation.Wherein, aforesaid i
α β 0 *result through the also output current feedforward at site place is the second result of calculation.
S20, according to the output current of the second result of calculation restriction combining inverter.
Such as, the output current maximum also by calculating in following formula (6), (7) and (8) controls the maximum output current of combining inverter, and then realizes low-voltage crossing function.
It should be noted that, in embodiments of the present invention, as long as can limit the rated current that output current is no more than parallel network reverse device, this output current just may be used for controlling combining inverter and realizes low-voltage crossing function.
As shown in Figure 3, this control system utilizes instantaneous power control strategy and adopts the control method in above-mentioned steps to control combining inverter output signal, and wherein, A represents and site.Fig. 4, Fig. 5 respectively show under symmetric fault and asymmetric fault two kinds of situations, when combining inverter Maximum Power Output, and the waveform of the output voltage of site, electric current and power.In figure, dotted line represents the mean value (that is, root-mean-square value) of output current.As shown in the figure, in case of a fault, the controller of parallel network reverse device can ensure that the mean value of output current is not more than the mean value of combining inverter rated current.It should be noted that, under symmetry and unbalanced fault situation, in power output, all do not comprise secondary concussion component.
As shown in Figure 6, in the experimental prototype that simulation low-voltage crossing controls, simulate same Fig. 2 of 26S Proteasome Structure and Function of the part of the first parallel network reverse device 20, do not repeat them here.The part simulating main electrical network 30 comprises: IGBT module 302, IGBT drive module 304, DSP306, it should be noted that, DSP306 can adopt open loop control mode, and sample frequency can be 15kHz.Wherein, the main electrical network 30 in this experimental prototype is the voltage-type system of a three-phase, and it can produce the three-phase voltage of variable frequency and variable amplitude, therefore, can be used for simulating grid failure condition; First parallel network reverse device 20 is parallel inverter device.
Fig. 7 (a), (b) give in symmetric fault situation, the three-phase power output of combining inverter, the oscillogram of electric current and the expanded view at fault generation these waveforms of moment.Fig. 8 (a), (b), (c) give in unbalanced fault situation, the three-phase output voltage of combining inverter, the oscillogram of power and the expanded view at fault generation these waveforms of moment.As shown in the figure, under the low voltage crossing control strategy that the present invention proposes, the output current of combining inverter all the time not higher than rated current, and can ensure level and smooth power output, and therefore, combining inverter can realize low voltage ride-through function.
The foregoing is only the preferred embodiments of the present invention, be not limited to the present invention, for a person skilled in the art, the present invention can have various modifications and variations.Within the spirit and principles in the present invention all, any amendment done, equivalent replacement, improvement etc., all should be included within protection scope of the present invention.
Claims (10)
1. for a control system for low-voltage crossing, it is characterized in that, comprising:
Micro-capacitance sensor, is provided with the first distributed power source and the second distributed power source in described micro-capacitance sensor, described micro-capacitance sensor is used for main electrical network transmission of electric energy; And
First parallel network reverse device, for when described main electric network fault, controls described first distributed power source in described micro-capacitance sensor and described second distributed power source realizes low-voltage crossing function.
2. the control system for low-voltage crossing according to claim 1, is characterized in that, be provided with the 3rd distributed power source in described micro-capacitance sensor, described control system also comprises:
Second parallel network reverse device, for when described main electric network fault, described 3rd distributed power source controlled in described micro-capacitance sensor realizes low-voltage crossing function.
3. the control system for low-voltage crossing according to claim 1, is characterized in that, described first distributed power source comprises one or more, and/or described second distributed power source comprises one or more.
4. the control system for low-voltage crossing according to claim 1, is characterized in that, described first parallel network reverse device comprises:
Combining inverter, for being connected with described main electrical network, is provided with between described main electrical network and described combining inverter and site;
Controller, be connected with described combining inverter, for gathering described combining inverter in described and on site output signal, and when described main electric network fault, limit the output current of described combining inverter according to the output signal on described in collecting and site.
5. the control system for low-voltage crossing according to claim 4, it is characterized in that, described controller, also for when described main electric network fault, is described according to the output signal described in collecting and on site and site provides support voltage, and described support voltage is more than or equal to preset value.
6. the control system for low-voltage crossing according to claim 5, it is characterized in that, described and output signal on site comprises current output signal and voltage output signal, when described main electric network fault, described controller is in the following manner according to collect described and output signal on site is described and site provides support voltage:
Current phasor corresponding for described current output signal is carried out coordinate transform, obtains the current phasor after converting;
Voltage vector corresponding for described voltage output signal is carried out coordinate transform, obtains the voltage vector after converting;
Obtain the mapping relations of the current phasor after the power stage vector of described combining inverter and described conversion and the voltage vector after described conversion;
Calculate according to the current phasor after described conversion and described mapping relations, obtain the first result of calculation; And
Be described according to described first result of calculation and site provides support voltage.
7. the control system for low-voltage crossing according to claim 4, is characterized in that, described combining inverter is IGBT module, and described first parallel network reverse device also comprises:
IGBT drive module, described IGBT drive module is for driving described IGBT module action.
8. the control system for low-voltage crossing according to claim 4, is characterized in that, described first parallel network reverse device also comprises:
Transducer, is connected between described combining inverter and described controller, and described controller gathers described combining inverter in described and on site output signal by described transducer.
9. the control system for low-voltage crossing according to claim 4, is characterized in that, described controller comprises digital signal processor.
10. the control system for low-voltage crossing according to claim 4, it is characterized in that, described and output signal on site comprises current output signal and voltage output signal, when described main electric network fault, described controller is in the following manner according to collect described and output signal on site limits the output current of described combining inverter:
Current phasor corresponding for described current output signal is carried out coordinate transform, obtains the current phasor after converting;
Voltage vector corresponding for described voltage output signal is carried out coordinate transform, obtains the voltage vector after converting;
Obtain the mapping relations of the current phasor after the power stage vector of described combining inverter and described conversion and the voltage vector after described conversion;
Calculate according to the current phasor after described conversion and described mapping relations, obtain the second result of calculation; And
The output current of described combining inverter is limited according to described second result of calculation.
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN108448635A (en) * | 2018-05-07 | 2018-08-24 | 哈尔滨工业大学 | The modeling method of fault traversing overall process in the case of photovoltaic generating system asymmetrical voltage falls |
| CN108899931A (en) * | 2018-08-01 | 2018-11-27 | 湖南大云信息科技有限公司 | A kind of micro-capacitance sensor low voltage ride through control system |
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| CN108448635B (en) * | 2018-05-07 | 2020-12-01 | 哈尔滨工业大学 | Photovoltaic power generation system asymmetric voltage drop fault ride-through overall process modeling method |
| CN108899931A (en) * | 2018-08-01 | 2018-11-27 | 湖南大云信息科技有限公司 | A kind of micro-capacitance sensor low voltage ride through control system |
| CN108899931B (en) * | 2018-08-01 | 2021-09-17 | 湖南大云信息科技有限公司 | Microgrid low-voltage ride-through control system |
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| CN104333041B (en) | 2017-09-29 |
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