CN104238623A - Multi-input photovoltaic inverter control method and system - Google Patents
Multi-input photovoltaic inverter control method and system Download PDFInfo
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- CN104238623A CN104238623A CN201410508120.2A CN201410508120A CN104238623A CN 104238623 A CN104238623 A CN 104238623A CN 201410508120 A CN201410508120 A CN 201410508120A CN 104238623 A CN104238623 A CN 104238623A
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- Y02E10/56—Power conversion systems, e.g. maximum power point trackers
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Abstract
The invention discloses a multi-input photovoltaic inverter control method and system. In an independent connection mode, by obtaining difference between maximum power point directive voltage of each loop of photovoltaic module string and the actual PV voltage of the loop and obtaining the duty ratio of the loop through regulation, the control of a switching tube of each DC/DC circuit is realized and thus the control of the photovoltaic inverter is realized; in parallel connection mode, by obtaining difference between maximum power point directive voltage of a DC/DC circuit of a master loop and the actual PV voltage of the loop and obtaining the duty ratio of the master loop through regulation, the control of switching tubes of the master loop and the DC/DC circuits of each slave loop is realized and thus the control of the photovoltaic inverter is realized. By obtaining the duty ratio of multiple loops or one loop in the independent connection mode and the parallel connection mode, the scheme realizes the control of the photovoltaic inverter, the realization method is simple and reliable and the complex control of multiple loops of DC/DC circuits in the prior art is avoided.
Description
Technical field
The present invention relates to control field, particularly relate to a kind of photovoltaic DC-to-AC converter control method and system of multi input.
Background technology
The system architecture of middle low power photovoltaic DC-to-AC converter as shown in Figure 1, is connected on common DC bus by multichannel PV photovoltaic group string usually after multichannel DC/DC circuit transformations, carries out inversion export control with a road DC/AC inverter.If the input of any several roads DC/DC circuit is same group of photovoltaic group string, then defining this connected mode is access module in parallel; If the input of any several roads DC/DC circuit is respective independently photovoltaic group string, then defining this connected mode is independent access module.
At present independent access module is mainly separated with access module in parallel by the method for the control of the photovoltaic DC-to-AC converter with DC/DC circuit and consider, for different access modules, to be furnished with a set of different MPPT maximum power point tracking controller and DC/DC control circui ring.
When adopting independent access module, by carrying out MPPT maximum power point tracking to this road PV voltage and controlled by control loop; When adopting access module in parallel, controlled by the PV voltage integrated on a few road, choose a wherein road, be set as main road, all the other are from road, carry out maximum power point tracking, then controlled by control loop the PV voltage of main road.
Aforesaid way is adopted to control the photovoltaic DC-to-AC converter with two-way DC/DC circuit, the situation that its external PV photovoltaic group string is independent or in parallel is also few, but, if the photovoltaic DC-to-AC converter with the DC/DC circuit on more than multichannel, especially three tunnels controls, the access module of various complexity will be there is, also can more complicated to the control of photovoltaic DC-to-AC converter, not easily realize.
Summary of the invention
In view of this, the invention provides a kind of photovoltaic DC-to-AC converter control method and system of multi input, to solve the problem to the control complexity of photovoltaic DC-to-AC converter in prior art, its concrete scheme is as follows:
A photovoltaic DC-to-AC converter control method for multi input, comprising:
Independent access module is adopted for PV photovoltaic group string:
Follow the trail of the maximum power point of multichannel PV photovoltaic Zu Chuanzhongmei road DC/DC circuit;
Obtain the first difference of the maximum power point command voltage of arbitrary road DC/DC circuit and the PV voltage of this road reality;
After described first difference being processed, export the dutycycle on this road, to control this way switch pipe;
Or, adopt access module in parallel for PV photovoltaic group string:
Follow the trail of the maximum power point of the DC/DC circuit of main road in multichannel PV photovoltaic group string, wherein, main road is the wherein road chosen from the DC/DC circuit the multichannel PV photovoltaic module followed the trail of, and all the other are from road;
Obtain the maximum power point command voltage of DC/DC circuit of main road and the second difference of the PV voltage of main road reality;
After described second difference being processed, export the dutycycle of main road, to control to main road and from the switching tube on road.
Further, described described first difference is processed after, export the dutycycle on this road, be specially:
After described first difference is carried out the first adjustment and amplitude limit, export the first given value of current value on this road;
Obtain the 3rd difference of the PV electric current of described first given value of current Zhi Yugai road reality;
After described 3rd difference is carried out the second adjustment and amplitude limit, export the dutycycle on this road.
Further, described described second difference is processed after, export the dutycycle of main road, be specially:
After described second difference is carried out the first adjustment and amplitude limit, export the second given value of current value of main road;
Obtain the 4th difference of the PV electric current of described second given value of current value and main road reality;
After described 4th difference is carried out the second adjustment and amplitude limit, export the dutycycle of main road.
Further, the dutycycle of described output main road, to control to main road and from the switching tube on road, is specially:
The switching tube of dutycycle to main road that main road exports controls;
The dutycycle that main road exports is controlled as the dutycycle from road the switching tube from road.
Further, the dutycycle of described output main road, to control to main road and from the switching tube on road, is specially:
The switching tube of dutycycle to main road that main road exports controls;
Using the current value of the second given value of current value of the main road of output as Ge Cong road;
Obtain the described current value from road and the 5th difference of being somebody's turn to do from the PV electric current of road reality;
Described 5th difference is carried out the 3rd regulate and after amplitude limit, export this dutycycle from road;
By should controlling from the dutycycle on road this switching tube from road of exporting.
A kind of photovoltaic inverter control system of multi input, comprise: MPPT controller, the first difference computational unit be connected with described MPPT controller, the first processing unit be connected with described first difference computational unit, the DC/DC control loop be connected with described first processing unit, wherein:
The corresponding MPPT controller of each road DC/DC circuit and DC/DC control loop;
When PV photovoltaic group string adopts independent access module:
Described MPPT controller follows the trail of the maximum power point of the DC/DC circuit on its place one tunnel in multichannel PV photovoltaic group string, and the maximum power point command voltage of this road described DC/DC circuit is sent to described first difference computational unit;
Described first difference computational unit is used for the maximum power point command voltage of this road DC/DC circuit and the PV voltage of this road reality to do difference, obtains the first difference;
Described first processing unit be used for described first difference is processed after, export the dutycycle on this road;
Described DC/DC control loop controls according to the switching tube of dutycycle to this road on this road;
When PV photovoltaic group string adopts access module in parallel:
The MPPT controller of main road follows the trail of the maximum power point of the DC/DC circuit of main road in multichannel PV photovoltaic group string, and the maximum power point command voltage of the DC/DC circuit of main road is sent to the first difference computational unit, wherein, main road is the wherein road chosen from the DC/DC circuit the multichannel PV photovoltaic module followed the trail of, and all the other are from road;
Described first difference computational unit is used for the maximum power point command voltage of the DC/DC circuit of main road and the PV voltage of main road reality to do difference, obtains the second difference;
After described first processing unit is used for described second difference to process, export the dutycycle of main road;
Described DC/DC control loop controls to main road and from the switching tube on road according to the output of described first processing unit.
Further, described first processing unit specifically comprises: be connected with described first difference computational unit first processes subelement, process with described first the second computing unit that subelement is connected, be connected respectively with described second computing unit and DC/DC control loop second processes subelement, wherein:
When PV photovoltaic group string adopts independent access module:
After described first process subelement is used for that described first difference is carried out the first adjustment and amplitude limit, export the first given value of current value on this road;
The PV electric current that described second computing unit is used for the first given value of current Zhi Yugai road reality exported by described first process subelement does difference, obtains the 3rd difference;
After described second process subelement is used for that the 3rd difference is carried out the second adjustment and amplitude limit, export the dutycycle on this road;
When PV photovoltaic group string adopts access module in parallel:
After described second difference is carried out the first adjustment and amplitude limit by described first process subelement, export the second given value of current value of main road;
The PV electric current that described second computing unit is used for the second given value of current value and the main road reality exported by described first process subelement does difference, obtains the 4th difference;
After described second process subelement is used for that the 4th difference is carried out the second adjustment and amplitude limit, export the dutycycle of main road.
Further, when PV photovoltaic group string adopts access module in parallel, described DC/DC control loop specifically comprises: be connected with described first processing unit first controls subelement, and be connected with described first processing unit second controls subelement, wherein:
Described first controls the dutycycle that subelement receives the main road that described first processing unit sends, and controls according to the switching tube of dutycycle to main road of described main road;
Described second controls subelement receives the dutycycle of main road that described first processing unit sends, and using the dutycycle of described main road as arbitrary dutycycle from road, and controls this switching tube from road according to the dutycycle of described main road.
Further, when PV photovoltaic group string adopts access module in parallel, to when controlling from road, described first processing unit is specially:
The PV electric current of the reality on the first given value of current Zhi Yugaicong road for receiving the first given value of current value of the main road of described first process subelement output, and is done difference by described second computing unit, obtains the 4th difference;
Described second process subelement is used for described 4th difference being carried out the 3rd and regulates and after amplitude limit, export the described dutycycle from road.
Further, when PV photovoltaic group string adopts access module in parallel, to when controlling from road, described DC/DC control loop is used for controlling from road from the dutycycle on road described described in described second process subelement output.
As can be seen from technique scheme, the photovoltaic DC-to-AC converter control method of multi input disclosed in the present application and system, by the difference to the maximum power point command voltage of each road photovoltaic group string and the PV voltage of this road reality, through regulating the dutycycle obtaining this road, realize the control to the switching tube of each road DC/DC circuit in independent access module, thus realize the control to photovoltaic DC-to-AC converter; Also by the difference to the maximum power point command voltage of the DC/DC circuit of main road in access module in parallel and the PV voltage of this road reality, through regulating the dutycycle obtaining main road, and realize the control to the switching tube of the DC/DC circuit on main road Ji Gecong road according to the dutycycle of main road, thus realize the control to photovoltaic DC-to-AC converter.This programme is by the acquisition to the multichannel in independent access module and access module in parallel or a road dutycycle, and realize the control to photovoltaic DC-to-AC converter, implementation is simple and reliable, overcomes the complex control to multichannel DC/DC circuit in prior art.
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 some embodiments of the present 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 these accompanying drawings.
Fig. 1 is the structural representation of a kind of middle low power photovoltaic DC-to-AC converter in prior art;
When Fig. 2 is the disclosed employing of the embodiment of the present invention independent access module, the process flow diagram of the photovoltaic DC-to-AC converter control method of multi input;
Fig. 3 is that the first difference carries out regulating and after amplitude limit, exporting the process flow diagram of the method for this road dutycycle by the disclosed one of the embodiment of the present invention;
When Fig. 4 is the disclosed a kind of employing of embodiment of the present invention access module in parallel, the process flow diagram of the photovoltaic DC-to-AC converter control method of multi input;
Fig. 5 is that disclosed a kind of second difference being carried out of the embodiment of the present invention regulates and after amplitude limit, export the dutycycle of main road, according to the output of main road to main road and the process flow diagram of method that controls from the switching tube on road;
The structural representation of Fig. 6 a kind of photovoltaic inverter control system of multi input disclosed in the embodiment of the present invention;
The structural representation of Fig. 7 a kind of first processing unit disclosed in the embodiment of the present invention.
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.
The invention discloses a kind of photovoltaic DC-to-AC converter control method of multi input, wherein, when PV photovoltaic group string is multichannel, independent access module can be adopted, also can adopt access module in parallel.
Concrete, when PV photovoltaic group string adopts independent access module, the process flow diagram of the photovoltaic DC-to-AC converter control method of multi input as shown in Figure 2, comprising:
The maximum power point of each road DC/DC circuit in step S21, tracking multichannel PV photovoltaic group string;
The switching tube all at least comprising a maximum power point tracking device Ji Duigai road in the DC/DC circuit of each road carries out the control device controlled, and wherein, maximum power point tracking device can be specially MPPT controller, and control device can be specially DC/DC control loop.
, be not limited to MPPT controller and DC/DC control loop herein, as long as the control that can realize maximum power point tracking and switching tube is just passable, be not specifically limited herein.
Step S22, obtain the first difference of the maximum power point command voltage of arbitrary road DC/DC circuit and the PV voltage of this road reality;
Owing to being independent access module herein, control in a like fashion so can adopt each road in DC/DC circuit, at this, only from multichannel DC/DC circuit, choose arbitrarily a wherein road.
Step S23, the first difference is processed after, export the dutycycle on this road, the dutycycle according to this road controls this way switch pipe.
The photovoltaic DC-to-AC converter control method of multi input disclosed in the present embodiment, by obtaining the dutycycle on this road to the difference of the maximum power point command voltage of each road photovoltaic group string and the PV voltage of this road reality, realize the control to the switching tube of each road DC/DC circuit in independent access module, thus realize the control to photovoltaic DC-to-AC converter.This programme is by the acquisition to each the road dutycycle in independent access module, and realize the control to photovoltaic DC-to-AC converter, implementation is simple and reliable, overcomes the complex control to multichannel DC/DC circuit in prior art.
Further, the present embodiment is disclosed to be adopted in the control method of the photovoltaic DC-to-AC converter of the multi input of independent access module, and after the first difference being processed in step S23, export the dutycycle on this road, idiographic flow as shown in Figure 3, comprising:
Step S231, the first difference is carried out the first adjustment and amplitude limit after, export the first given value of current value on this road;
Step S232, obtain the 3rd difference of the PV electric current of the first given value of current Zhi Yugai road reality;
Step S233, the 3rd difference is carried out the second adjustment and amplitude limit after, export the dutycycle on this road.
It should be noted that, first regulates and the second adjustment, can regulate, or proportional, integral PI regulates, or proportional-integral-differential PID regulates, do not limit the concrete type regulated here for ratio P.
The disclosed method adopting this road dutycycle of output of independent access module of the present embodiment, have employed the mode of double-loop control, namely first adopt voltage compare, then carry out electric current and compare, and then obtain the mode of dutycycle, achieve the accurate acquisition adopting better simply algorithm realization dutycycle.
When PV photovoltaic group string adopts access module in parallel, the journey figure of the photovoltaic DC-to-AC converter control method of multi input as shown in Figure 4, comprising:
The maximum power point of the DC/DC circuit of main road in step S41, tracking multichannel PV photovoltaic group string;
Choosing a wherein road DC/DC circuit is main road, and all the other are from road.
The switching tube all at least comprising a maximum power point tracking device Ji Duigai road in the DC/DC circuit of each road carries out the control device controlled, and wherein, maximum power point tracking device can be specially MPPT controller, and control device can be specially DC/DC control loop.
, be not limited to MPPT controller and DC/DC control loop herein, as long as the control that can realize maximum power point tracking and switching tube is just passable, be not specifically limited herein.
Step S42, the acquisition maximum power point command voltage of DC/DC circuit of main road and the second difference of the PV voltage of main road reality;
Owing to being access module in parallel, therefore, in multichannel DC/DC circuit, choose a wherein road and, as main road, first the correlation values of main road is obtained.
Step S43, the second difference is processed after, export the dutycycle of main road, the dutycycle according to the main road exported controls to main road and from the switching tube on road.
Obtain the dutycycle of main road, the switching tube of dutycycle to main road according to main road controls, simultaneously, owing to being the DC/DC circuit that multichannel adopts access module in parallel, therefore, using the dutycycle of main road as all dutycycles from road, and then the switching tube from road is controlled.
The photovoltaic DC-to-AC converter control method of multi input disclosed in the present embodiment, by the difference of the maximum power point command voltage of the DC/DC circuit to main road in access module in parallel and the PV voltage of this road reality, through regulating the dutycycle obtaining main road, and realize the control to the switching tube of the DC/DC circuit on main road Ji Gecong road according to the dutycycle of main road, thus realize the control to photovoltaic DC-to-AC converter.This programme is by the acquisition to access module Zhong mono-tunnel in parallel dutycycle, and realize the control to photovoltaic DC-to-AC converter, implementation is simple and reliable, overcomes the complex control to multichannel DC/DC circuit in prior art.
Further, the present embodiment is disclosed to be adopted in the control method of the photovoltaic DC-to-AC converter of the multi input of access module in parallel, after the second difference being processed in step S43, export the dutycycle of main road, output according to main road controls to main road and from the switching tube on road, idiographic flow as shown in Figure 5, comprising:
Step S431, the second difference is carried out the first adjustment and amplitude limit after, export the second given value of current value of main road;
Step S432, obtain the 4th difference of the PV electric current of the second given value of current value and main road reality;
Step S433, the 4th difference is carried out the second adjustment and amplitude limit after, export the dutycycle of main road;
The switching tube of dutycycle to main road that step S434, main road export controls;
Step S435, using the second given value of current value of main road of exporting as the current value on Ge Cong road;
Step S436, obtain from the current value on road with should from the 5th difference of the PV electric current of road reality;
Step S437, the 5th difference carried out the 3rd and to regulate and after amplitude limit, export this dutycycle from road;
Step S438, by should controlling from the dutycycle on road this switching tube from road of exporting.
It should be noted that, the first adjustment, second regulates and the 3rd adjustment, can regulate, or proportional, integral PI regulates, or proportional-integral-differential PID regulates for ratio P, does not limit the type of concrete adjustment here.
The disclosed method adopting this road dutycycle of output of access module in parallel of the present embodiment, have employed the mode of double-loop control, namely first adopt voltage compare, then carry out electric current and compare, and then obtain the mode of dutycycle, achieve the accurate acquisition adopting better simply algorithm realization dutycycle; And, adopt in the mode of voltage, double current loop modulation, be that the second given electric current exported by main road is obtained from the acquisition of road dutycycle, this mode not only making dutycycle obtain is simple, and can also realize the control of switch tube according to the situation of physical circuit.
Present embodiment discloses a kind of photovoltaic inverter control system of multi input, wherein, when PV photovoltaic group string is multichannel, independent access module can be adopted, also can adopt access module in parallel.
Its structural representation as shown in Figure 6, comprising:
MPPT controller 61, the first difference computational unit 62 be connected with MPPT controller 61, the first processing unit 63 be connected with the first difference computational unit 62, the DC/DC control loop 64 be connected with the first processing unit 63.
Wherein, each road DC/DC circuit at least comprises a MPPT controller 61 and DC/DC control loop 64.
Concrete, when PV photovoltaic group string adopts independent access module, the concrete function of the photovoltaic inverter control system of multi input comprises:
MPPT controller 61 follows the trail of the maximum power point of the DC/DC circuit on its place one tunnel in multichannel PV photovoltaic group string, and the maximum power point command voltage of Bing Jianggai road DC/DC circuit is sent to the first difference computational unit 62.
First difference computational unit 62, for the maximum power point command voltage of this road DC/DC circuit and the PV voltage of this road reality are done difference, obtains the first difference.
First processing unit 63, for after the first difference being processed, exports the dutycycle on this road.
DC/DC control loop 64 controls for the switching tube of dutycycle to this road according to this road.
The photovoltaic inverter control system of multi input disclosed in the present embodiment, adopts in the structure of independent access module for PV photovoltaic group string, and the control of the switching tube of any road DC/DC circuit can be realized by such scheme.
The photovoltaic inverter control system of multi input disclosed in the present embodiment, by obtaining the dutycycle on this road to the difference of the maximum power point command voltage of each road photovoltaic group string and the PV voltage of this road reality, realize the control to the switching tube of each road DC/DC circuit in independent access module, thus realize the control to photovoltaic DC-to-AC converter.This programme is by the acquisition to each the road dutycycle in independent access module, and realize the control to photovoltaic DC-to-AC converter, implementation is simple and reliable, overcomes the complex control to multichannel DC/DC circuit in prior art.
Further, the first processing unit 63 in the disclosed photovoltaic inverter control system adopting the multi input of independent access module of the present embodiment can be, after only carrying out Primary regulation and amplitude limit, i.e. output duty cycle, also can for carrying out after twice adjustment and amplitude limit just output duty cycle, for latter event, the structural representation of the first processing unit 63 as shown in Figure 7, specifically comprises:
Be connected with the first difference computational unit 62 first processes subelement 631, and process with first the second computing unit 632 that subelement 631 is connected, be connected respectively with the second computing unit 632 and DC/DC control loop 64 second processes subelement 633.
Wherein, the first process subelement 631, for after the first difference is carried out the first adjustment and amplitude limit, exports the first given value of current value on this road.
Second computing unit 632 does difference for the PV electric current of the first given value of current Zhi Yugai road reality exported by the first process subelement 631, obtains the 3rd difference.
Second process subelement 633, for after the 3rd difference is carried out the second adjustment and amplitude limit, exports the dutycycle on this road.
The present embodiment is disclosed to be adopted in the photovoltaic inverter control system of the multi input of independent access module, have employed the mode of double-loop control, namely first adopt voltage compare, then carry out electric current and compare, and then obtain the mode of dutycycle, achieve the accurate acquisition adopting better simply algorithm realization dutycycle.
It should be noted that, first regulates and the second adjustment, can regulate, or proportional, integral PI regulates, or proportional-integral-differential PID regulates, do not limit the concrete type regulated here for ratio P.
When PV photovoltaic group string adopts access module in parallel, the concrete function of the photovoltaic inverter control system of multi input comprises:
The switching tube all at least comprising a maximum power point tracking device Ji Duigai road in the DC/DC circuit of each road carries out the control device controlled, and wherein, maximum power point tracking device can be specially MPPT controller, and control device can be specially DC/DC control loop.
, be not limited to MPPT controller and DC/DC control loop herein, as long as the control that can realize maximum power point tracking and switching tube is just passable, be not specifically limited herein.
First from the multichannel DC/DC circuit of the PV photovoltaic group string of employing access module in parallel, choosing a road is main road, and all the other are from road.
The MPPT controller 61 of main road follows the trail of the maximum power point of the DC/DC circuit of main road in multichannel PV photovoltaic group string, and the maximum power point command voltage of the DC/DC circuit of main road is sent to the first difference computational unit 62.
First difference computational unit 62 does difference for the maximum power point command voltage of the DC/DC circuit by main road and the PV voltage of main road reality, obtains the second difference.
First processing unit 63, for after the second difference being processed, exports the dutycycle of main road.
The dutycycle that DC/DC control loop 64 exports according to the first processing unit 63 controls to main road and from the switching tube on road.
Obtain the dutycycle of main road, the switching tube of dutycycle to main road according to main road controls, simultaneously, owing to being the DC/DC circuit that multichannel adopts access module in parallel, therefore, using the dutycycle of main road as all dutycycles from road, and then the switching tube from road is controlled.
Wherein, DC/DC control loop 64 can specifically comprise: be connected with the first processing unit 63 first controls subelement, and be connected with the first processing unit 63 second controls subelement.
First controls subelement for receiving the dutycycle of the main road of the first processing unit 63 transmission, and controls according to the switching tube of dutycycle to main road of main road.
Second controls the dutycycle of main road that subelement sends for receiving the first processing unit 63, using the dutycycle of main road as arbitrary dutycycle from road, and controls this switching tube from road according to the dutycycle of main road.
The photovoltaic inverter control system of multi input disclosed in the present embodiment, the dutycycle of main road is obtained by the difference of the maximum power point of the DC/DC circuit to main road in access module in parallel and the PV voltage of this road reality, and realize the control to the switching tube of the DC/DC circuit on main road Ji Gecong road according to the dutycycle of main road, thus realize the control to photovoltaic DC-to-AC converter.This programme is by the acquisition to access module Zhong mono-tunnel in parallel dutycycle, and realize the control to photovoltaic DC-to-AC converter, implementation is simple and reliable, overcomes the complex control to multichannel DC/DC circuit in prior art.
Further, the present embodiment is disclosed to be adopted in the control system of the photovoltaic DC-to-AC converter of the multi input of access module in parallel, first processing unit 63 can be, after only carrying out Primary regulation and amplitude limit, i.e. output duty cycle, also can for carrying out after twice adjustment and amplitude limit just output duty cycle, for latter event, the structural representation of the first processing unit 63 as shown in Figure 7, specifically comprises:
Be connected with the first difference computational unit 62 first processes subelement 631, and process with first the second computing unit 632 that subelement 631 is connected, be connected respectively with the second computing unit 632 and DC/DC control loop 64 second processes subelement 633.
Wherein, the first process subelement 631, for after the second difference is carried out the first adjustment and amplitude limit, exports the second given value of current value of main road.
Second computing unit 632, for the PV electric current of first process the second given value of current value of exporting of subelement 631 and main road reality is done difference, obtains the 4th difference.
Second process subelement 633, for after the 4th difference is carried out the second adjustment and amplitude limit, exports the dutycycle of main road.
The present embodiment is disclosed to be adopted in the photovoltaic inverter control system of the multi input of access module in parallel, have employed the mode of double-loop control, namely first adopt voltage compare, then carry out electric current and compare, and then obtain the mode of dutycycle, achieve the accurate acquisition adopting better simply algorithm realization dutycycle.
Said process is the mode of the main road in the photovoltaic inverter system of the multi input adopting access module in parallel being carried out to switch controlled, and for the control of the switching tube from road, Zai Duicong road is not needed to obtain to the acquisition of the second given value of current value, second given value of current value of direct reception main road, and carry out subsequent operation, be specially:
Second computing unit 632 receives the second given value of current value of the main road that the first process subelement 631 exports, and the PV electric current of the reality on the second given value of current Zhi Yugaicong road is done difference, obtains the 4th difference.
4th interpolation is carried out the 3rd and is regulated and after amplitude limit, export the dutycycle from road by the second process subelement 633.
The present embodiment is disclosed adopt in the photovoltaic inverter system of the multi input of access module in parallel in the control procedure from way switch pipe, to the acquisition of dutycycle, without the need to adopting the obtain manner of the dutycycle of main road, only need directly to adopt the second given value of current value in main road, and carry out data processing, can obtain the dutycycle from road, the process operation of dutycycle is simple, result is accurate to adopt such scheme to obtain.
In addition, obtaining after the dutycycle on road, what exported according to the second process subelement 633 by DC/DC control loop 64 controls from road from the dutycycle on road this.
It should be noted that, the first adjustment, second regulates and the 3rd adjustment, can regulate, or proportional, integral PI regulates, or proportional-integral-differential PID regulates for ratio P, does not limit the type of concrete adjustment here.
In this instructions, each embodiment adopts the mode of going forward one by one to describe, and what each embodiment stressed is the difference with other embodiments, between each embodiment identical similar portion mutually see.For device disclosed in embodiment, because it corresponds to the method disclosed in Example, so description is fairly simple, relevant part illustrates see method part.
Professional can also recognize further, in conjunction with unit and the algorithm steps of each example of embodiment disclosed herein description, can realize with electronic hardware, computer software or the combination of the two, in order to the interchangeability of hardware and software is clearly described, generally describe composition and the step of each example in the above description according to function.These functions perform with hardware or software mode actually, depend on application-specific and the design constraint of technical scheme.Professional and technical personnel can use distinct methods to realize described function to each specifically should being used for, but this realization should not thought and exceeds scope of the present invention.
The software module that the method described in conjunction with embodiment disclosed herein or the step of algorithm can directly use hardware, processor to perform, or the combination of the two is implemented.Software module can be placed in the storage medium of other form any known in random access memory (RAM), internal memory, ROM (read-only memory) (ROM), electrically programmable ROM, electrically erasable ROM, register, hard disk, moveable magnetic disc, CD-ROM or technical field.
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. a photovoltaic DC-to-AC converter control method for multi input, is characterized in that, comprising:
Independent access module is adopted for PV photovoltaic group string:
Follow the trail of the maximum power point of multichannel PV photovoltaic Zu Chuanzhongmei road DC/DC circuit;
Obtain the first difference of the maximum power point command voltage of arbitrary road DC/DC circuit and the PV voltage of this road reality;
After described first difference being processed, export the dutycycle on this road, to control this way switch pipe;
Or, adopt access module in parallel for PV photovoltaic group string:
Follow the trail of the maximum power point of the DC/DC circuit of main road in multichannel PV photovoltaic group string, wherein, main road is the wherein road chosen from the DC/DC circuit the multichannel PV photovoltaic module followed the trail of, and all the other are from road;
Obtain the maximum power point command voltage of DC/DC circuit of main road and the second difference of the PV voltage of main road reality;
After described second difference being processed, export the dutycycle of main road, to control to main road and from the switching tube on road.
2. method according to claim 1, is characterized in that, described described first difference is processed after, export the dutycycle on this road, be specially:
After described first difference is carried out the first adjustment and amplitude limit, export the first given value of current value on this road;
Obtain the 3rd difference of the PV electric current of described first given value of current Zhi Yugai road reality;
After described 3rd difference is carried out the second adjustment and amplitude limit, export the dutycycle on this road.
3. method according to claim 1, is characterized in that, described described second difference is processed after, export the dutycycle of main road, be specially:
After described second difference is carried out the first adjustment and amplitude limit, export the second given value of current value of main road;
Obtain the 4th difference of the PV electric current of described second given value of current value and main road reality;
After described 4th difference is carried out the second adjustment and amplitude limit, export the dutycycle of main road.
4. method according to claim 1, is characterized in that, the dutycycle of described output main road, to control to main road and from the switching tube on road, is specially:
The switching tube of dutycycle to main road that main road exports controls;
The dutycycle that main road exports is controlled as the dutycycle from road the switching tube from road.
5. method according to claim 3, is characterized in that, the dutycycle of described output main road, to control to main road and from the switching tube on road, is specially:
The switching tube of dutycycle to main road that main road exports controls;
Using the current value of the second given value of current value of the main road of output as Ge Cong road;
Obtain the described current value from road and the 5th difference of being somebody's turn to do from the PV electric current of road reality;
Described 5th difference is carried out the 3rd regulate and after amplitude limit, export this dutycycle from road;
By should controlling from the dutycycle on road this switching tube from road of exporting.
6. the photovoltaic inverter control system of a multi input, it is characterized in that, comprise: MPPT controller, the first difference computational unit be connected with described MPPT controller, the first processing unit be connected with described first difference computational unit, the DC/DC control loop be connected with described first processing unit, wherein:
The corresponding MPPT controller of each road DC/DC circuit and DC/DC control loop;
When PV photovoltaic group string adopts independent access module:
Described MPPT controller follows the trail of the maximum power point of the DC/DC circuit on its place one tunnel in multichannel PV photovoltaic group string, and the maximum power point command voltage of this road described DC/DC circuit is sent to described first difference computational unit;
Described first difference computational unit is used for the maximum power point command voltage of this road DC/DC circuit and the PV voltage of this road reality to do difference, obtains the first difference;
Described first processing unit be used for described first difference is processed after, export the dutycycle on this road;
Described DC/DC control loop controls according to the switching tube of dutycycle to this road on this road;
When PV photovoltaic group string adopts access module in parallel:
The MPPT controller of main road follows the trail of the maximum power point of the DC/DC circuit of main road in multichannel PV photovoltaic group string, and the maximum power point command voltage of the DC/DC circuit of main road is sent to the first difference computational unit, wherein, main road is the wherein road chosen from the DC/DC circuit the multichannel PV photovoltaic module followed the trail of, and all the other are from road;
Described first difference computational unit is used for the maximum power point command voltage of the DC/DC circuit of main road and the PV voltage of main road reality to do difference, obtains the second difference;
After described first processing unit is used for described second difference to process, export the dutycycle of main road;
Described DC/DC control loop controls to main road and from the switching tube on road according to the output of described first processing unit.
7. system according to claim 6, it is characterized in that, described first processing unit specifically comprises: be connected with described first difference computational unit first processes subelement, the second computing unit that subelement is connected is processed with described first, be connected respectively with described second computing unit and DC/DC control loop second processes subelement, wherein:
When PV photovoltaic group string adopts independent access module:
After described first process subelement is used for that described first difference is carried out the first adjustment and amplitude limit, export the first given value of current value on this road;
The PV electric current that described second computing unit is used for the first given value of current Zhi Yugai road reality exported by described first process subelement does difference, obtains the 3rd difference;
After described second process subelement is used for that the 3rd difference is carried out the second adjustment and amplitude limit, export the dutycycle on this road;
When PV photovoltaic group string adopts access module in parallel:
After described second difference is carried out the first adjustment and amplitude limit by described first process subelement, export the second given value of current value of main road;
The PV electric current that described second computing unit is used for the second given value of current value and the main road reality exported by described first process subelement does difference, obtains the 4th difference;
After described second process subelement is used for that the 4th difference is carried out the second adjustment and amplitude limit, export the dutycycle of main road.
8. system according to claim 6, it is characterized in that, when PV photovoltaic group string adopts access module in parallel, described DC/DC control loop specifically comprises: be connected with described first processing unit first controls subelement, be connected with described first processing unit second controls subelement, wherein:
Described first controls the dutycycle that subelement receives the main road that described first processing unit sends, and controls according to the switching tube of dutycycle to main road of described main road;
Described second controls subelement receives the dutycycle of main road that described first processing unit sends, and using the dutycycle of described main road as arbitrary dutycycle from road, and controls this switching tube from road according to the dutycycle of described main road.
9. system according to claim 7, is characterized in that, when PV photovoltaic group string adopts access module in parallel, to when controlling from road, described first processing unit is specially:
The PV electric current of the reality on the first given value of current Zhi Yugaicong road for receiving the first given value of current value of the main road of described first process subelement output, and is done difference by described second computing unit, obtains the 4th difference;
Described second process subelement is used for described 4th difference being carried out the 3rd and regulates and after amplitude limit, export the described dutycycle from road.
10. system according to claim 9, it is characterized in that, when PV photovoltaic group string adopts access module in parallel, to when controlling from road, described DC/DC control loop is used for controlling from road from the dutycycle on road described described in described second process subelement output.
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