CN104022532A - Grid-connected inverter control method and system for photovoltaic power generation system - Google Patents
Grid-connected inverter control method and system for photovoltaic power generation system Download PDFInfo
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- 238000010248 power generation Methods 0.000 title abstract description 3
- 238000005070 sampling Methods 0.000 claims abstract description 7
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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
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- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
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Abstract
The invention provides a method and a system for controlling an inverter of a photovoltaic power generation system, wherein the method and the system firstly calculate an active power given value; then calculating to obtain an inner ring current given value according to the active power given value; sampling the current of the power grid to obtain a three-phase sampling current value; subtracting the three-phase sampling current value from the current inner ring set value to obtain an inner ring current difference value; carrying out proportional integral adjustment on the inner loop current difference value to obtain a control reference signal; and calculating to obtain a switching tube control signal of the grid-connected inverter according to the control reference signal, wherein the switching tube control signal is used for controlling the grid-connected inverter to invert so as to output three-phase alternating current. Through closed-loop control, eliminate the influence of the harmonic wave that the direct current bus appears because of the unbalanced grid voltage leads to output voltage, can obtain the sinusoidal alternating voltage of good three-phase to can solve the relatively poor problem of output current quality when the grid voltage is unbalanced.
Description
Technical field
The present invention relates to photovoltaic power generation technology field, more particularly, relate to a kind of control method and system of combining inverter of photovoltaic generating system.
Background technology
In existing photovoltaic generating system, when unbalanced source voltage, in the DC bus input voltage of combining inverter, will contain a large amount of harmonic waves, cause the voltage fluctuation of DC bus, and then cause in the output current of combining inverter and comprise a large amount of harmonic waves, therefore cause output current second-rate, need a kind of control method of grid-connected inverter and system badly, to solve poor problem of its transmission of electricity current mass when the unbalanced source voltage.
Summary of the invention
In view of this, the invention provides a kind of control method of grid-connected inverter and system of photovoltaic generating system, to solve the second-rate problem of its output current when the unbalanced source voltage.
To achieve these goals, the existing scheme proposing is as follows:
A control method of grid-connected inverter for photovoltaic generating system, comprises the steps:
According to the DC bus-bar voltage of combining inverter, calculate active power set-point;
According to described active power set-point and default reactive power set-point, calculate current inner loop set-point;
Obtain the three-phase sample rate current value of electrical network;
Described current inner loop set-point is deducted to described three-phase sample rate current value, obtain interior circular current difference;
Described interior circular current difference is carried out to proportional integral adjusting, controlled reference signal;
According to described control reference signal, obtain the switch controlled signal of described parallel network reverse; Described switch controlled signal is used for controlling described combining inverter output three-phase alternating current.
Preferably, the described DC bus-bar voltage according to combining inverter calculates active power set-point, comprising:
Obtain the DC bus-bar voltage of described combining inverter;
The DC bus-bar voltage set-point that described DC bus-bar voltage is deducted to combining inverter, obtains busbar voltage difference;
Described busbar voltage difference is carried out to proportional integral adjusting, obtain given value of current value;
According to described given value of current value and described DC bus-bar voltage set-point, calculate described active power set-point.
Preferably, described reactive power set-point is preset as 0.
Preferably, described described interior circular current difference is carried out to proportional integral adjusting, controlled reference signal, comprising:
Described interior circular current difference is carried out to proportional integral calculating;
Using signal obtained in the previous step as described control reference signal.
Preferably, described described interior circular current difference is carried out to proportional integral adjusting, controlled reference signal, comprising:
Described interior circular current difference is carried out to proportional integral calculating, obtain pre-control reference signal;
Obtain mains voltage signal;
From described mains voltage signal, extract electrical network negative phase-sequence electromotive force;
By described, deduct described electrical network negative phase-sequence electromotive force with controlling reference signal, using the signal obtaining as described control reference signal.
A combining inverter control system for photovoltaic generating system, comprising:
The given module of active power, is configured to for calculating active power set-point according to the DC bus-bar voltage of combining inverter;
The given module of interior circular current, is configured to, for according to described active power set-point and default reactive power set-point, calculate current inner loop set-point;
Current sample module, is configured to for obtaining the three-phase sample rate current value of electrical network;
Computing module, is configured to, for described current inner loop set-point being deducted to described three-phase sample rate current value, obtain interior circular current difference;
Proportional integral module, is configured to for described interior circular current difference is carried out to proportional integral adjusting, controlled reference signal;
Pulse width modulation module, is configured to for obtain the switch controlled signal of described parallel network reverse according to described control reference signal; Described switch controlled signal is used for controlling described combining inverter output three-phase alternating current.
Preferably, the given module of described active power comprises:
DC bus-bar voltage sampling unit, is configured to for obtaining the DC bus-bar voltage of described combining inverter;
The first computing unit, is configured to, for the described DC bus-bar voltage of described combining inverter is deducted to DC bus-bar voltage set-point, obtain busbar voltage difference;
The first pi element, is configured to, for described busbar voltage difference is carried out to proportional integral adjusting, obtain given value of current value;
The second computing unit, is configured to, for according to described given value of current value and described DC bus-bar voltage set-point, calculate described active power set-point.
Preferably, described reactive power set-point is preset as 0.
Preferably, described proportional integral module comprises:
The second pi element, is configured to, for described interior circular current difference is carried out to proportional integral calculating, obtain described control reference signal.
Preferably, described proportional integral module comprises:
The second pi element, is configured to, for described interior circular current difference is carried out to proportional integral calculating, obtain pre-control reference signal;
Mains voltage signal acquiring unit, is configured to for obtaining mains voltage signal;
The 3rd computing unit, is configured to for extract electrical network negative phase-sequence electromotive force from described mains voltage signal;
The 4th computing unit, is configured to for deducting described electrical network negative phase-sequence electromotive force by described with controlling reference signal, using the signal obtaining as described control reference signal.
From technique scheme, can find out, the invention provides a kind of inverter control method and system of photovoltaic generating system, first the method and system calculate active power set-point; Then according to active power set-point, calculate interior circular current set-point; Again the electric current of electrical network is sampled, obtain three-phase sample rate current value; Current inner loop set-point is deducted to three-phase sample rate current value, obtain interior circular current difference; Internally circular current difference is carried out proportional integral adjusting, controlled reference signal; According to this control reference signal, calculate the switch controlled signal of combining inverter, this switch controlled signal is used for controlling combining inverter and carries out inversion, thus output three-phase alternating current.By closed-loop control, can access the second best in quality three phase sine alternating voltage, thereby can solve the second-rate problem of output current when unbalanced source voltage.
Accompanying drawing explanation
In order to be illustrated more clearly in the embodiment of the present invention or technical scheme of the prior art, to the accompanying drawing of required use in embodiment or description of the Prior Art be briefly described below, apparently, accompanying drawing in the following describes is only some embodiments of the present invention, for those of ordinary skills, do not paying under the prerequisite of creative work, can also obtain according to these accompanying drawings other accompanying drawing.
The flow chart of the control method of grid-connected inverter of a kind of photovoltaic generating system that Fig. 1 provides for the embodiment of the present invention;
The flow chart of the control method of grid-connected inverter of a kind of photovoltaic generating system that Fig. 2 provides for another embodiment of the present invention;
The flow chart of the control method of grid-connected inverter of a kind of photovoltaic generating system that Fig. 3 provides for further embodiment of this invention;
The structure chart of the combining inverter control system of a kind of photovoltaic generating system that Fig. 4 provides for further embodiment of this invention;
The structure chart of the combining inverter control system of a kind of photovoltaic generating system that Fig. 5 provides for further embodiment of this invention.
Embodiment
Below in conjunction with the accompanying drawing in the embodiment of the present invention, the technical scheme in the embodiment of the present invention is clearly and completely described, obviously, described embodiment is only the present invention's part embodiment, rather than whole embodiment.Embodiment based in the present invention, those of ordinary skills, not making the every other embodiment obtaining under creative work prerequisite, belong to the scope of protection of the invention.
The flow chart of the control method of grid-connected inverter of a kind of photovoltaic generating system that Fig. 1 provides for the embodiment of the present invention.
As shown in Figure 1, the control method of grid-connected inverter that the present embodiment provides comprises the steps:
S101: calculate active power set-point;
According to the DC bus-bar voltage of combining inverter, calculate active power set-point.
S102: circular current set-point in calculating;
The active power set-point obtaining according to previous step and default reactive power set-point, calculate current inner loop set-point.Wherein reactive power set-point is preset as 0.
S103: the three-phase sample rate current value of obtaining electrical network;
S104: circular current difference in calculating.
The current inner loop set-point that step S102 is obtained deducts the three-phase sample rate current value that previous step obtains, thereby obtains interior circular current difference.
S105: calculate and control reference signal;
The interior circular current difference of previous step is carried out to proportional integral adjusting, controlled reference signal.
S106: output switch pipe control signal.
According to the control reference signal of previous step, calculate, obtain and export the switch controlled signal of combining inverter; Switch controlled signal is used for controlling this combining inverter output three-phase alternating current.
From technique scheme, can find out, the present embodiment provides a kind of inverter control method of photovoltaic generating system, and first the method calculates active power set-point; Then according to active power set-point, calculate interior circular current set-point; Again the electric current of electrical network is sampled, obtain three-phase sample rate current value; Current inner loop set-point is deducted to three-phase sample rate current value, obtain interior circular current difference; Internally circular current difference is carried out proportional integral adjusting, controlled reference signal; According to this control reference signal, calculate the switch controlled signal of combining inverter, this switch controlled signal is used for controlling combining inverter and carries out inversion, thus output three-phase alternating current.By closed-loop control, can access the second best in quality three phase sine alternating voltage, thereby can solve the second-rate problem of output current when unbalanced source voltage.
Embodiment bis-
The flow chart of the control method of grid-connected inverter of a kind of photovoltaic generating system that Fig. 2 provides for another embodiment of the present invention.
As shown in Figure 2, the control method of grid-connected inverter that the present embodiment provides comprises the steps:
S201: obtain DC bus-bar voltage;
Obtain the DC bus-bar voltage of combining inverter.
S202: calculate busbar voltage difference;
The DC bus-bar voltage that combining inverter previous step is obtained deducts DC bus-bar voltage set-point, obtains busbar voltage difference.
S203: calculate given value of current value;
The busbar voltage difference that previous step is obtained is carried out proportional integral adjusting, calculates given value of current value.
S204: calculate active power set-point;
According to given value of current value and described DC bus-bar voltage set-point, calculate active power set-point.
S205: circular current set-point in calculating;
The active power set-point obtaining according to previous step and default reactive power set-point, calculate current inner loop set-point.Wherein reactive power set-point is preset as 0.
S206: the three-phase sample rate current value of obtaining electrical network;
S207: circular current difference in calculating;
The current inner loop set-point of acquisition is deducted to the three-phase sample rate current value that previous step obtains, thereby obtain interior circular current difference.
S208: calculate and control reference signal;
The interior circular current difference of previous step is carried out to proportional integral adjusting, controlled reference signal.
S209: output switch pipe control signal
According to the control reference signal of previous step, calculate, obtain and export the switch controlled signal of combining inverter; Switch controlled signal is used for controlling this combining inverter output three-phase alternating current.
Embodiment tri-
The flow chart of the control method of grid-connected inverter of a kind of photovoltaic generating system that Fig. 3 provides for further embodiment of this invention.
As shown in Figure 3, the control method of grid-connected inverter that the present embodiment provides comprises the steps:
S301: obtain DC bus-bar voltage;
Obtain the DC bus-bar voltage of combining inverter.
S302: calculate busbar voltage difference;
The DC bus-bar voltage that the previous step of combining inverter is obtained deducts DC bus-bar voltage set-point, obtains busbar voltage difference.
S303: calculate given value of current value;
The busbar voltage difference that previous step is obtained is carried out proportional integral adjusting, calculates given value of current value.
S304: calculate active power set-point;
According to given value of current value and described DC bus-bar voltage set-point, calculate active power set-point.
S305: circular current set-point in calculating;
The active power set-point obtaining according to previous step and default reactive power set-point, calculate current inner loop set-point.Wherein reactive power set-point is preset as 0.
S306: the three-phase sample rate current value of obtaining electrical network;
S307: circular current difference in calculating;
The current inner loop set-point of acquisition is deducted to the three-phase sample rate current value that previous step obtains, thereby obtain interior circular current difference.
S308: calculate pre-control reference signal;
The interior circular current difference of previous step is carried out to proportional integral adjusting, obtain pre-control reference signal.
S309: obtain mains voltage signal;
S310: extract electrical network negative phase-sequence electromotive force;
From the mains voltage signal of obtaining, extract electrical network negative phase-sequence electromotive force.
S311: calculate control reference signal;
By described, deduct described electrical network negative phase-sequence electromotive force with controlling reference signal, using the signal obtaining as described control reference signal.
S312: output switch pipe control signal.
According to the control reference signal of previous step, calculate, obtain and export the switch controlled signal of combining inverter; Switch controlled signal is used for controlling this combining inverter output three-phase alternating current.
Embodiment tetra-
The structure chart of the combining inverter control system of a kind of photovoltaic generating system that Fig. 4 provides for further embodiment of this invention.
As shown in Figure 4, the combining inverter control system that the present embodiment provides comprises meritorious power given module, the given module of interior ring electric power, current sample module, computing module, proportional integral module and pulse width modulation module.
The given module 10 of active power is for calculating active power set-point according to the DC bus-bar voltage of combining inverter.
The given module 20 of interior circular current, for according to active power set-point and default reactive power set-point, calculates current inner loop set-point, and reactive power set-point is preferably 0.
Current sample module 40 is for obtaining the three-phase sample rate current value of electrical network.
Computing module 30, for described current inner loop set-point being deducted to described three-phase sample rate current value, obtains interior circular current difference.
Proportional integral module 50 is for carrying out proportional integral adjusting, controlled reference signal by described interior circular current difference.
Pulse width modulation module 60 is for obtaining the switch controlled signal of described parallel network reverse according to control reference signal; Described switch controlled signal is used for controlling described combining inverter output three-phase alternating current.
From technique scheme, can find out, the present embodiment provides a kind of inverter control system of photovoltaic generating system, and first this system calculates active power set-point; Then according to active power set-point, calculate interior circular current set-point; Again the electric current of electrical network is sampled, obtain three-phase sample rate current value; Current inner loop set-point is deducted to three-phase sample rate current value, obtain interior circular current difference; Internally circular current difference is carried out proportional integral adjusting, controlled reference signal; According to this control reference signal, calculate the switch controlled signal of combining inverter, this switch controlled signal is used for controlling combining inverter and carries out inversion, thus output three-phase alternating current.By closed-loop control, can access the second best in quality three phase sine alternating voltage, thereby can solve the second-rate problem of output current when unbalanced source voltage.
The given module 10 of active power in the present embodiment comprises DC bus-bar voltage sampling unit, the first computing unit, the first pi element and the second computing unit.
DC bus-bar voltage 11 sampling units are for obtaining the DC bus-bar voltage of described combining inverter.
The first computing unit 12, for the DC bus-bar voltage of described combining inverter being deducted to described DC bus-bar voltage set-point, obtains busbar voltage difference.
The first pi element 13, for described busbar voltage difference is carried out to proportional integral adjusting, obtains given value of current value.
The second computing unit 14, for according to described given value of current value and described DC bus-bar voltage set-point, calculates described active power set-point.
Embodiment five
The structure chart of the combining inverter control system of a kind of photovoltaic generating system that Fig. 5 provides for further embodiment of this invention.
As shown in Figure 5, the present embodiment is on the basis of a upper embodiment, the input of pulse width modulation module 60 to be improved.
The proportional integral module 50 of the present embodiment comprises the second pi element 51, mains voltage signal acquiring unit 52, the 3rd computing unit 53 and the 4th computing unit 54.
The second pi element 51, for described interior circular current difference is carried out to proportional integral calculating, obtains pre-control reference signal;
Mains voltage signal acquiring unit 52 is for obtaining mains voltage signal;
The 3rd computing unit 53 is for extracting electrical network negative phase-sequence electromotive force from described mains voltage signal;
The 4th computing unit 54 is for deducting described electrical network negative phase-sequence electromotive force by described with controlling reference signal, using the signal obtaining as described control reference signal and outputed to pulse width modulation module 60.
The present embodiment, by adding the feedfoward control of electrical network negative phase-sequence electromotive force, can further suppress the impact of electrical network negative phase-sequence electromotive force on the output current of combining inverter.
Finally, also it should be noted that, in this article, relational terms such as the first and second grades is only used for an entity or operation to separate with another entity or operating space, and not necessarily requires or imply and between these entities or operation, have the relation of any this reality or sequentially.And, term " comprises ", " comprising " or its any other variant are intended to contain comprising of nonexcludability, thereby the process, method, article or the equipment that make to comprise a series of key elements not only comprise those key elements, but also comprise other key elements of clearly not listing, or be also included as the intrinsic key element of this process, method, article or equipment.The in the situation that of more restrictions not, the key element being limited by statement " comprising ... ", and be not precluded within process, method, article or the equipment that comprises described key element and also have other identical element.
In this specification, each embodiment adopts the mode of going forward one by one to describe, and each embodiment stresses is the difference with other embodiment, between each embodiment identical similar part mutually referring to.
Above-mentioned explanation to the disclosed embodiments, makes professional and technical personnel in the field can realize or use the present invention.To the multiple modification of these embodiment, will be apparent for those skilled in the art, General Principle as defined herein can, in the situation that not departing from the spirit or scope of the present invention, realize in other embodiments.Therefore, the present invention will can not be restricted to these embodiment shown in this article, but will meet the widest scope consistent with principle disclosed herein and features of novelty.
Claims (10)
1. a control method of grid-connected inverter for photovoltaic generating system, is characterized in that, comprises the steps:
According to the DC bus-bar voltage of combining inverter, calculate active power set-point;
According to described active power set-point and default reactive power set-point, calculate current inner loop set-point;
Obtain the three-phase sample rate current value of electrical network;
Described current inner loop set-point is deducted to described three-phase sample rate current value, obtain interior circular current difference;
Described interior circular current difference is carried out to proportional integral adjusting, controlled reference signal;
According to described control reference signal, obtain the switch controlled signal of described parallel network reverse; Described switch controlled signal is used for controlling described combining inverter output three-phase alternating current.
2. control method of grid-connected inverter according to claim 1, is characterized in that, the described DC bus-bar voltage according to combining inverter calculates active power set-point, comprising:
Obtain the DC bus-bar voltage of described combining inverter;
The DC bus-bar voltage set-point that described DC bus-bar voltage is deducted to described combining inverter, obtains busbar voltage difference;
Described busbar voltage difference is carried out to proportional integral adjusting, obtain given value of current value;
According to described given value of current value and described DC bus-bar voltage set-point, calculate described active power set-point.
3. control method of grid-connected inverter according to claim 1, is characterized in that, described reactive power set-point is preset as 0.
4. control method of grid-connected inverter according to claim 1, is characterized in that, described described interior circular current difference is carried out to proportional integral adjusting, and controlled reference signal, comprising:
Described interior circular current difference is carried out to proportional integral calculating;
Using signal obtained in the previous step as described control reference signal.
5. control method of grid-connected inverter according to claim 1, is characterized in that, described described interior circular current difference is carried out to proportional integral adjusting, and controlled reference signal, comprising:
Described interior circular current difference is carried out to proportional integral calculating, obtain pre-control reference signal;
Obtain mains voltage signal;
From described mains voltage signal, extract electrical network negative phase-sequence electromotive force;
By described, deduct described electrical network negative phase-sequence electromotive force with controlling reference signal, using the signal obtaining as described control reference signal.
6. a combining inverter control system for photovoltaic generating system, is characterized in that, comprising:
The given module of active power, is configured to for calculating active power set-point according to the DC bus-bar voltage of combining inverter;
The given module of interior circular current, is configured to, for according to described active power set-point and default reactive power set-point, calculate current inner loop set-point;
Current sample module, is configured to for obtaining the three-phase sample rate current value of electrical network;
Computing module, is configured to, for described current inner loop set-point being deducted to described three-phase sample rate current value, obtain interior circular current difference;
Proportional integral module, is configured to for described interior circular current difference is carried out to proportional integral adjusting, controlled reference signal;
Pulse width modulation module, is configured to for obtain the switch controlled signal of described parallel network reverse according to described control reference signal; Described switch controlled signal is used for controlling described combining inverter output three-phase alternating current.
7. combining inverter control system according to claim 6, is characterized in that, the given module of described active power comprises:
DC bus-bar voltage sampling unit, is configured to for obtaining the DC bus-bar voltage of described combining inverter;
The first computing unit, is configured to, for described DC bus-bar voltage being deducted to the DC bus-bar voltage set-point of described combining inverter, obtain busbar voltage difference;
The first pi element, is configured to, for described busbar voltage difference is carried out to proportional integral adjusting, obtain given value of current value;
The second computing unit, is configured to, for according to described given value of current value and described DC bus-bar voltage set-point, calculate described active power set-point.
8. combining inverter control system according to claim 6, is characterized in that, described reactive power set-point is preset as 0.
9. combining inverter control system according to claim 6, is characterized in that, described proportional integral module comprises:
The second pi element, is configured to, for described interior circular current difference is carried out to proportional integral calculating, obtain described control reference signal.
10. combining inverter control system according to claim 6, is characterized in that, described proportional integral module comprises:
The second pi element, is configured to, for described interior circular current difference is carried out to proportional integral calculating, obtain pre-control reference signal;
Mains voltage signal acquiring unit, is configured to for obtaining mains voltage signal;
The 3rd computing unit, is configured to for extract electrical network negative phase-sequence electromotive force from described mains voltage signal;
The 4th computing unit, is configured to for deducting described electrical network negative phase-sequence electromotive force by described with controlling reference signal, using the signal obtaining as described control reference signal.
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