CN114844096B - Photovoltaic inverter control method and system for inhibiting voltage out-of-limit - Google Patents

Photovoltaic inverter control method and system for inhibiting voltage out-of-limit Download PDF

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CN114844096B
CN114844096B CN202210394803.4A CN202210394803A CN114844096B CN 114844096 B CN114844096 B CN 114844096B CN 202210394803 A CN202210394803 A CN 202210394803A CN 114844096 B CN114844096 B CN 114844096B
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photovoltaic
voltage
access node
nth
value
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CN114844096A (en
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孙媛媛
李亚辉
孙凯祺
许庆燊
庄静茹
路彤
徐龙威
张安彬
刘振
徐恭德
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Shandong University
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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
    • 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
    • H02J3/12—Circuit arrangements for ac mains or ac distribution networks for adjusting voltage in ac networks by changing a characteristic of the network load
    • 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
    • H02J2203/00—Indexing scheme relating to details of circuit arrangements for AC mains or AC distribution networks
    • H02J2203/10—Power transmission or distribution systems management focussing at grid-level, e.g. load flow analysis, node profile computation, meshed network optimisation, active network management or spinning reserve management
    • 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
    • H02J2300/00—Systems for supplying or distributing electric power characterised by decentralized, dispersed, or local generation
    • H02J2300/20—The dispersed energy generation being of renewable origin
    • H02J2300/22—The renewable source being solar energy
    • H02J2300/24—The renewable source being solar energy of photovoltaic origin
    • 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
    • Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E10/00—Energy generation through renewable energy sources
    • Y02E10/50—Photovoltaic [PV] energy
    • Y02E10/56—Power conversion systems, e.g. maximum power point trackers

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Abstract

The invention provides a photovoltaic inverter control method and a photovoltaic inverter control system for inhibiting voltage out-of-limit, which are used for acquiring the voltage of each node as a reference value of operating voltage when photovoltaic output is not considered, setting inverter control parameters according to the reference value, acquiring the actual operating voltage of a photovoltaic access node, and controlling a photovoltaic inverter according to the actual operating voltage value; controlling the photovoltaic inverter of each photovoltaic access node according to the line equivalent line impedance; the photovoltaic inverter control system can fully utilize the rapid and flexible regulation capability of the photovoltaic inverter, has the effects of inhibiting voltage out-of-limit and reducing the voltage fluctuation range, and can effectively ensure the safe and stable operation of a power distribution network.

Description

Photovoltaic inverter control method and system for inhibiting voltage out-of-limit
Technical Field
The invention relates to the technical field of photovoltaic inverter control, in particular to a photovoltaic inverter control method and system for inhibiting voltage out-of-limit.
Background
The statements in this section merely provide background information related to the present disclosure and may not constitute prior art.
Because photovoltaic power generation has the advantages of green and clean resources, no danger of exhaustion, unlimited distribution and the like, the photovoltaic power generation has been widely and rapidly developed. With the gradual development of distributed photovoltaic, the popularity of distributed photovoltaic power generation in power distribution networks is increasing, and a high-proportion distributed photovoltaic access becomes a typical characteristic of the power distribution networks. However, large-scale distributed photovoltaic can cause the voltage of an access point to rise, thereby causing the voltage of a distribution network to exceed the limit, and in severe cases, electrical equipment of the distribution network can be damaged, and even the voltage of the distribution network can collapse.
The inventor finds that the control output power is generally only considered in the conventional photovoltaic inverter control method, but the influence of the photovoltaic inverter on the voltage of the access point is neglected in the control mode, so that the node voltage is easily out of limit and the voltage fluctuation range is very large, and the electric energy quality and safe and stable operation of a power distribution network are influenced.
Disclosure of Invention
Aiming at the problem of voltage out-of-limit caused by distributed photovoltaic access, the invention provides a photovoltaic inverter control method and a system for inhibiting the voltage out-of-limit, which can make full use of the rapid and flexible regulation capability of the photovoltaic inverter and have the effects of inhibiting the voltage out-of-limit and reducing the voltage fluctuation range.
In order to achieve the purpose, the invention adopts the following technical scheme:
a first aspect of the invention provides a photovoltaic inverter control method for suppressing voltage violations.
A photovoltaic inverter control method for suppressing voltage violations, comprising the process of:
judging whether the actual operating voltage of the nth photovoltaic access node exceeds the limit or not;
if the number of the photovoltaic access nodes exceeds the limit, sequencing the photovoltaic access nodes from small to large according to equivalent line impedance of the shortest line of the rest N-1 photovoltaic access nodes and the nth photovoltaic access node, and sequentially setting the power factor angle of the photovoltaic inverter of each photovoltaic access node according to a sequencing result;
if the output power factor angle of the photovoltaic inverter of the nth photovoltaic access node is not out of limit, setting the output power factor angle of the photovoltaic inverter of the nth photovoltaic access node according to the actual operating voltage value; after an output power factor angle is set, controlling the photovoltaic inverter until a preset signal processing time interval elapses, and re-executing the step of judging whether the actual operating voltage of the nth photovoltaic access node is out of limit;
and re-acquiring the actual operating voltage of the nth photovoltaic access node, when the re-acquired actual operating voltage of the nth photovoltaic access node is greater than the minimum value of the allowable operating voltage of the nth photovoltaic access node and is less than the maximum value of the allowable operating voltage of the nth photovoltaic access node, re-executing the step of judging whether the actual operating voltage of the nth photovoltaic access node is out of limit, otherwise, continuously setting the output power factor angles of the photovoltaic inverters of other photovoltaic access nodes until all the rest N-1 photovoltaic inverters are completely set.
As an optional implementation manner, the voltage of each photovoltaic access node of the photovoltaic grid-connected access system is used as the photovoltaic inverter operating voltage reference value U of each photovoltaic access node n,base And determining inverter control parameters of each photovoltaic access node, wherein the inverter control parameters at least comprise: maximum value U of allowable operating voltage of nth photovoltaic access node n,acc,max And minimum value U n,acc,min The maximum value U of the operating voltage can be adjusted n,adj,max And minimum value U n,adj,min (ii) a Maximum value U of limit operating voltage n,lim,max And minimum value U n,lim,min (ii) a Photovoltaic inverter output power factor angle phi n Maximum value of allowable adjustment phi n,max And a minimum value phi n,min ；
Wherein, U n,acc,max ＝1.05U n,base ，U n,acc,min ＝0.95U n,base ，U n,adj,max ＝1.10U n,base ，U n,adj,min ＝0.90U n,base ，U n,lim,max ＝1.20U n,base ，U n,lim,min ＝0.8U n,base ，φ n,max ＝arcos0.85，φ n,min ＝-arcos0.85。
As an optional implementation manner, the out-of-limit condition of the actual operating voltage of the nth photovoltaic access node is as follows: the maximum value of the limit operation voltage of the nth photovoltaic access node is larger than, or the minimum value of the limit operation voltage of the nth photovoltaic access node is smaller than.
As an optional further limitation, the setting of the photovoltaic inverter output power factor angle of the nth photovoltaic access node according to the actual operating voltage value includes:
Figure GDA0003869927440000031
as an optional implementation manner, after the output power factor angle is set, controlling the photovoltaic inverter includes:
acquiring the direct-current side voltage of the nth photovoltaic inverter, comparing the direct-current side voltage with a set value of the direct-current side voltage, and outputting an alternating-current reference value by adopting a PI (proportional integral) controller;
setting a d-axis current reference value and a q-axis current reference value;
detecting the current of the alternating current side of the nth photovoltaic inverter, and obtaining a d-axis current value and a q-axis current value respectively after park transformation;
acquiring a d-axis signal according to the d-axis current value and the d-axis current reference value, and acquiring a q-axis signal according to the q-axis current value and the q-axis current reference value;
detecting the voltage of the alternating current side of the nth photovoltaic inverter, and respectively obtaining a d-axis voltage value and a q-axis voltage value after park transformation;
respectively calculating a d-axis control signal and a q-axis control signal;
performing park inverse transformation on the d-axis control signal and the q-axis control signal to respectively obtain reference wave signals;
and respectively comparing the reference wave signal with the triangular carrier wave signal to obtain a photovoltaic inverter control signal.
As an optional further limitation, the d-axis control signal and the q-axis control signal are:
S n,d ＝E n,d -ωL+U n,d
S n,q ＝E n,q +ωL+U n,q
wherein, omega is the angular frequency of the alternating voltage, L is the equivalent inductance of the filter at the alternating current side of the nth photovoltaic inverter, E n,d Is a d-axis signal, E n,q Is a q-axis signal, U n,d Is d-axis voltage value, U n,q Is the q-axis voltage value.
As an optional further limitation, after comparing the reference wave signal with the triangular carrier signal, obtaining a photovoltaic inverter control signal includes:
when the value of the reference wave signal is larger than that of the triangular carrier signal, controlling the upper bridge arm of the photovoltaic inverter to be connected and the lower bridge arm to be disconnected; and when the reference wave signal value is smaller than the triangular carrier signal value, controlling the upper bridge arm of the photovoltaic inverter to be switched off and the lower bridge arm to be switched on.
A second aspect of the invention provides a photovoltaic inverter control system for inhibiting voltage violations.
A photovoltaic inverter control system for inhibiting voltage violations, comprising:
a voltage out-of-limit determination module configured to: judging whether the actual operating voltage of the nth photovoltaic access node exceeds the limit or not;
an out-of-limit control module configured to: if the number of the photovoltaic access nodes exceeds the limit, sequencing the photovoltaic access nodes from small to large according to equivalent line impedance of the shortest line of the rest N-1 photovoltaic access nodes and the nth photovoltaic access node, and sequentially setting the power factor angle of the photovoltaic inverter of each photovoltaic access node according to a sequencing result;
an out-of-limit control module configured to: if the current value does not exceed the limit, setting the photovoltaic inverter output power factor angle of the nth photovoltaic access node according to the actual operating voltage value; after an output power factor angle is set, controlling the photovoltaic inverter until a preset signal processing time interval elapses, and re-executing the step of judging whether the actual operating voltage of the nth photovoltaic access node is out of limit;
an actual operating voltage re-determination module configured to: and re-acquiring the actual operating voltage of the nth photovoltaic access node, when the re-acquired actual operating voltage of the nth photovoltaic access node is greater than the minimum value of the allowable operating voltage of the nth photovoltaic access node and is less than the maximum value of the allowable operating voltage of the nth photovoltaic access node, re-executing the step of judging whether the actual operating voltage of the nth photovoltaic access node is out of limit, otherwise, continuously setting the output power factor angles of the photovoltaic inverters of other photovoltaic access nodes until all the rest N-1 photovoltaic inverters are completely set.
A third aspect of the present invention provides a computer-readable storage medium having stored thereon a program which, when executed by a processor, implements the steps in the method for photovoltaic inverter control for suppressing voltage violations as described in the first aspect of the present invention.
A fourth aspect of the present invention provides an electronic device, including a memory, a processor, and a program stored on the memory and executable on the processor, wherein the processor executes the program to implement the steps of the method for controlling a photovoltaic inverter for suppressing voltage violations according to the first aspect of the present invention.
Compared with the prior art, the invention has the beneficial effects that:
1. the photovoltaic inverter control method and the photovoltaic inverter control system for inhibiting the voltage from exceeding the limit can fully utilize the rapid and flexible regulation capacity of the photovoltaic inverter, and have the effects of inhibiting the voltage from exceeding the limit and reducing the voltage fluctuation range.
2. The photovoltaic inverter control method and the photovoltaic inverter control system for inhibiting the voltage out-of-limit can effectively control the problem of overlarge node voltage, improve the safe and stable operation capability of a power grid, enable the system to have good electric energy quality level, achieve the purposes of inhibiting the voltage out-of-limit and reducing the voltage fluctuation range, and have the advantages of scientific method, strong applicability, good effect and the like.
Advantages of additional aspects of the invention will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention.
Drawings
The accompanying drawings, which are incorporated in and constitute a part of this specification, are included to provide a further understanding of the invention, and are incorporated in and constitute a part of this specification, illustrate exemplary embodiments of the invention and together with the description serve to explain the invention and not to limit the invention.
Fig. 1 is a flowchart of a photovoltaic inverter control method for suppressing voltage violations according to embodiment 1 of the present invention.
Fig. 2 is a schematic diagram of a photovoltaic inverter control for suppressing voltage violations provided in embodiment 1 of the present invention.
Fig. 3 is a schematic diagram of a power distribution network provided in embodiment 1 of the present invention (the topology is only for illustration and is not limited thereto, and may be actually expanded and improved).
Fig. 4 is a graph illustrating a variation trend of the photovoltaic output power provided in embodiment 1 of the present invention.
Fig. 5 is a load ratio variation trend chart provided in embodiment 1 of the present invention.
Fig. 6 is a graph of a voltage variation trend of a control node without using a photovoltaic inverter according to embodiment 1 of the present invention.
Fig. 7 is a graph illustrating a voltage variation trend of a node after the photovoltaic inverter is used for controlling according to embodiment 1 of the present invention.
Detailed Description
The invention is further described with reference to the following figures and examples.
It is to be understood that the following detailed description is exemplary and is intended to provide further explanation of the invention as claimed. Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs.
It is noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of exemplary embodiments according to the invention. As used herein, the singular forms "a", "an" and "the" are intended to include the plural forms as well, and it should be understood that when the terms "comprises" and/or "comprising" are used in this specification, they specify the presence of stated features, steps, operations, devices, components, and/or combinations thereof, unless the context clearly indicates otherwise.
The embodiments and features of the embodiments of the invention may be combined with each other without conflict.
Example 1:
as shown in fig. 1, embodiment 1 of the present invention provides a photovoltaic inverter control method for suppressing voltage violations, including the following processes:
s1: aiming at a photovoltaic grid-connected access system, under the condition of not considering photovoltaic output, a Newton-Raphson algorithm is adopted to calculate the power flow of a power distribution network, N photovoltaic access nodes exist in the system, and the voltage of each photovoltaic access node is obtained and used as a reference value of the operating voltage of a photovoltaic inverter. For theThe nth photovoltaic access node and the photovoltaic inverter have the reference value of the operating voltage of U n,base 。
S2: setting inverter control parameters: maximum value U of allowable operating voltage of nth photovoltaic access node n,acc,max And minimum value U n,acc,min The maximum value U of the operating voltage can be adjusted n,adj,max And minimum value U n,adj,max (ii) a Maximum value U of limit operating voltage n,lim,max And minimum value U n,lim,max (ii) a Photovoltaic inverter output power factor angle
Figure GDA0003869927440000071
Has an initial value of 0, a maximum value permissible to be adjusted>
Figure GDA0003869927440000072
And a minimum value->
Figure GDA0003869927440000073
The specific settings are as follows:
Figure GDA0003869927440000074
/>
s3: obtaining actual operation voltage U of nth photovoltaic access node n,act Judging whether the voltage exceeds the limit: when U is turned n,act >U n,lim,max Or U n,act <U n,lim,min When the voltage is out of limit, the step is switched to S5; otherwise, the output power factor angle of the photovoltaic inverter is obtained according to the actual operation voltage value
Figure GDA0003869927440000075
The setting is carried out in the following mode:
Figure GDA0003869927440000081
s4: setting an output power factor angle
Figure GDA0003869927440000082
Then, the photovoltaic inverter is controlled according to the power factor angle>
Figure GDA0003869927440000083
The control method of the photovoltaic inverter is as shown in fig. 2, and the control returns to S3 until the signal processing time interval Δ t elapses. In setting the output power factor angle>
Figure GDA0003869927440000084
Then, the control method for the nth photovoltaic inverter is as follows:
1) Detecting the voltage U of the direct current side of the nth photovoltaic inverter n,dc After comparing with the set value of the voltage at the DC side, the PI controller is adopted to output the reference value I of the AC current n,ref ；
2) Setting d-axis and q-axis current reference values of the alternating current, wherein the d-axis current reference value is
Figure GDA0003869927440000085
The q-axis current reference value is->
Figure GDA0003869927440000086
3) Detecting the current I on the AC side of the nth photovoltaic inverter n Obtaining d-axis and q-axis current values I after park transformation n,d And I n,q ；
4) According to d-axis current value I n,d And d-axis current reference value
Figure GDA0003869927440000087
Obtaining d-axis signals E n,d According to the q-axis current value I n,q And q-axis current reference value>
Figure GDA0003869927440000088
Obtaining a q-axis signal E n,q ；
5) Detecting the AC side voltage U of the nth photovoltaic inverter n Respectively obtaining d-axis and q-axis voltage values U after park transformation n,d And U n,q ；
6) Respectively calculated-axis and q-axis control signals S n,d And S n,q The calculation method is as follows:
S n,d ＝E n,d -ωL+U n,d
S n,q ＝E n,q +ωL+U n,q
in the formula, omega is the angular frequency of the alternating voltage, and L is the equivalent inductance of the alternating-current side filter of the nth photovoltaic inverter;
7) Control signals S of d-axis and q-axis n,d And S n,q Respectively obtaining reference wave signals after park inverse transformation;
8) Respectively comparing the reference wave signal with the triangular carrier wave signal to obtain a photovoltaic inverter control signal, and realizing the control of the photovoltaic inverter;
the photovoltaic inverter control signal acquisition mode is as follows: when the reference wave signal value is larger than the triangular carrier signal value, controlling the upper bridge arm of the photovoltaic inverter to be conducted and the lower bridge arm to be switched off; and when the reference wave signal value is smaller than the triangular carrier signal value, controlling the upper bridge arm of the photovoltaic inverter to be switched off and the lower bridge arm to be switched on.
S5: and sequencing from small to large according to the equivalent line impedance of the shortest line of the rest N-1 photovoltaic access nodes and the nth photovoltaic access node.
S6: according to the sequencing result, sequentially aiming at the power factor angle of the photovoltaic inverter of each photovoltaic access node
Figure GDA0003869927440000094
(i ≠ n) performs setting: when U is formed n,act >U n,lim,max When it is set->
Figure GDA0003869927440000091
When U is formed n,act <U n,lim,min When, setting >>
Figure GDA0003869927440000092
S7: reacquiring the actual operating voltage U of the nth photovoltaic access node n,act When U is formed n,acc,min <U n,act <U n,acc,max Turning to the third step; otherwise, continuously setting the output power factor angle of the photovoltaic inverter
Figure GDA0003869927440000093
Until the rest N-1 photovoltaic inverters are all arranged.
Fig. 3 is a modified IEEE33 node photovoltaic grid-connected system, and the embodiment is a specific application of the photovoltaic inverter control method for suppressing voltage violation in the system. The system comprises 1 generator, 18 branches and 32 loads, wherein the nodes 6, 10, 12, 13, 17, 21, 25, 29 and 32 are respectively connected with the photovoltaic with the same capacity, the photovoltaic capacity is 2MW, the trend of the photovoltaic power changing along with time in one day is shown in figure 4, and the trend of the load ratio changing is shown in figure 5.
The node voltage of the photovoltaic grid-connected system is controlled based on the photovoltaic inverter control method, and the comparison of the node voltage amplitude values in one day before and after the photovoltaic inverter control method is adopted is respectively shown in fig. 6 and fig. 7. According to comparison, under the action of the photovoltaic inverter control method, the node voltage can be effectively controlled to be overlarge, the safe and stable operation capacity of a power grid is improved, the system has a good electric energy quality level, and the purposes of inhibiting voltage from exceeding the limit and reducing the voltage fluctuation range are achieved.
Example 2:
an embodiment 2 of the present invention provides a photovoltaic inverter control system for suppressing voltage violations, including:
a voltage out-of-limit determination module configured to: judging whether the actual operating voltage of the nth photovoltaic access node exceeds the limit or not;
an out-of-limit control module configured to: if the number of the photovoltaic access nodes exceeds the limit, sequencing the photovoltaic access nodes from small to large according to equivalent line impedance of the shortest line of the rest N-1 photovoltaic access nodes and the nth photovoltaic access node, and sequentially setting the power factor angle of the photovoltaic inverter of each photovoltaic access node according to a sequencing result;
an out-of-limit control module configured to: if the current value does not exceed the limit, setting the photovoltaic inverter output power factor angle of the nth photovoltaic access node according to the actual operating voltage value; after an output power factor angle is set, controlling the photovoltaic inverter until a preset signal processing time interval elapses, and re-executing the step of judging whether the actual operating voltage of the nth photovoltaic access node is out of limit;
an actual operating voltage re-determination module configured to: and re-acquiring the actual operating voltage of the nth photovoltaic access node, when the re-acquired actual operating voltage of the nth photovoltaic access node is greater than the minimum value of the allowable operating voltage of the nth photovoltaic access node and is less than the maximum value of the allowable operating voltage of the nth photovoltaic access node, re-executing the step of judging whether the actual operating voltage of the nth photovoltaic access node is out of limit, otherwise, continuously setting the output power factor angles of the photovoltaic inverters of other photovoltaic access nodes until all the rest N-1 photovoltaic inverters are completely set.
The specific working method of the system is the same as the photovoltaic inverter control method for suppressing voltage out-of-limit in embodiment 1, and details are not repeated here.
Example 3:
embodiment 3 of the present invention provides a computer-readable storage medium on which a program is stored, the program, when executed by a processor, implementing the steps in the photovoltaic inverter control method for suppressing voltage violations as described in embodiment 1 of the present invention.
Example 4:
embodiment 4 of the present invention provides an electronic device, which includes a memory, a processor, and a program stored in the memory and executable on the processor, and when the processor executes the program, the steps in the photovoltaic inverter control method for suppressing voltage violations described in embodiment 1 of the present invention are implemented.
As will be appreciated by one skilled in the art, embodiments of the present invention may be provided as a method, system, or computer program product. Accordingly, the present invention may take the form of a hardware embodiment, a software embodiment, or an embodiment combining software and hardware aspects. Furthermore, the present invention may take the form of a computer program product embodied on one or more computer-usable storage media (including, but not limited to, disk storage, optical storage, and the like) having computer-usable program code embodied therein.
The present invention is described with reference to flowchart illustrations and/or block diagrams of methods, apparatus (systems), and computer program products according to embodiments of the invention. It will be understood that each flow and/or block of the flow diagrams and/or block diagrams, and combinations of flows and/or blocks in the flow diagrams and/or block diagrams, can be implemented by computer program instructions. These computer program instructions may be provided to a processor of a general purpose computer, special purpose computer, embedded processor, or other programmable data processing apparatus to produce a machine, such that the instructions, which execute via the processor of the computer or other programmable data processing apparatus, create means for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.
These computer program instructions may also be stored in a computer-readable memory that can direct a computer or other programmable data processing apparatus to function in a particular manner, such that the instructions stored in the computer-readable memory produce an article of manufacture including instruction means which implement the function specified in the flowchart flow or flows and/or block diagram block or blocks.
These computer program instructions may also be loaded onto a computer or other programmable data processing apparatus to cause a series of operational steps to be performed on the computer or other programmable apparatus to produce a computer implemented process such that the instructions which execute on the computer or other programmable apparatus provide steps for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.
It will be understood by those skilled in the art that all or part of the processes of the methods of the embodiments described above may be implemented by a computer program, which may be stored in a computer readable storage medium and executed by a computer to implement the processes of the embodiments of the methods described above. The storage medium may be a magnetic disk, an optical disk, a Read-Only Memory (ROM), a Random Access Memory (RAM), or the like.
The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention, and various modifications and changes may be made by those skilled in the art. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims (10)

1. A photovoltaic inverter control method for suppressing voltage violations, characterized by:
the method comprises the following steps:
judging whether the actual operating voltage of the nth photovoltaic access node exceeds the limit or not;
if the number of the photovoltaic access nodes exceeds the limit, sequencing the photovoltaic access nodes from small to large according to equivalent line impedance of the shortest line of the rest N-1 photovoltaic access nodes and the nth photovoltaic access node, and sequentially setting the power factor angle of the photovoltaic inverter of each photovoltaic access node according to a sequencing result;
if the current value does not exceed the limit, setting the photovoltaic inverter output power factor angle of the nth photovoltaic access node according to the actual operating voltage value; after an output power factor angle is set, controlling the photovoltaic inverter until a preset signal processing time interval elapses, and re-executing the step of judging whether the actual operating voltage of the nth photovoltaic access node is out of limit;
and re-acquiring the actual operating voltage of the nth photovoltaic access node, when the re-acquired actual operating voltage of the nth photovoltaic access node is greater than the minimum value of the allowable operating voltage of the nth photovoltaic access node and is less than the maximum value of the allowable operating voltage of the nth photovoltaic access node, re-executing the step of judging whether the actual operating voltage of the nth photovoltaic access node is out of limit, otherwise, continuously setting the output power factor angles of the photovoltaic inverters of other photovoltaic access nodes until all the rest N-1 photovoltaic inverters are completely set.
2. The photovoltaic inverter control method for suppressing voltage violations as claimed in claim 1, wherein:
photovoltaic inverter operation voltage reference value U taking voltage of each photovoltaic access node of photovoltaic grid-connected access system as each photovoltaic access node n,base Determining inverter control parameters of each photovoltaic access node, wherein the inverter control parameters at least comprise: maximum value U of allowable operating voltage of nth photovoltaic access node n,acc,max And minimum value U n,acc,min The maximum value U of the operating voltage can be adjusted n,adj,max And minimum value U n,adj,min (ii) a Maximum value U of limit operating voltage n,lim,max And minimum value U n,lim,min (ii) a Photovoltaic inverter output power factor angle phi n Maximum value of allowable adjustment phi n,max And a minimum value phi n,min ；
Wherein, U n,acc,max ＝1.05U n,base ，U n,acc,min ＝0.95U n,base ，U n,adj,max ＝1.10U n,base ，U n,adj,min ＝0.90U n,base ，U n,lim,max ＝1.20U n,base ，U n,lim,min ＝0.8U n,base ，φ n,max ＝arcos0.85，φ n,min ＝-arcos0.85。
3. The photovoltaic inverter control method for suppressing voltage violations of claim 1 or 2, wherein:
the practical operation voltage out-of-limit condition of the nth photovoltaic access node is as follows: the maximum value of the limit operation voltage of the nth photovoltaic access node is larger than the maximum value of the limit operation voltage of the nth photovoltaic access node, or the minimum value of the limit operation voltage of the nth photovoltaic access node is smaller than the minimum value of the limit operation voltage of the nth photovoltaic access node.
4. The photovoltaic inverter control method for suppressing voltage violations of claim 2, wherein:
the photovoltaic inverter output power factor angle of the nth photovoltaic access node is set according to the actual operation voltage value, and the method comprises the following steps:
Figure FDA0003869927430000021
5. the photovoltaic inverter control method for suppressing voltage violations of claim 1, wherein:
after setting up output power factor angle, control photovoltaic inverter, include:
acquiring the direct-current side voltage of the nth photovoltaic inverter, comparing the direct-current side voltage with a set value of the direct-current side voltage, and outputting an alternating-current reference value by adopting a PI (proportional integral) controller;
setting a d-axis current reference value and a q-axis current reference value;
detecting the current of the alternating current side of the nth photovoltaic inverter, and obtaining a d-axis current value and a q-axis current value respectively after park transformation;
acquiring a d-axis signal according to the d-axis current value and the d-axis current reference value, and acquiring a q-axis signal according to the q-axis current value and the q-axis current reference value;
detecting the voltage of the alternating current side of the nth photovoltaic inverter, and respectively obtaining a d-axis voltage value and a q-axis voltage value after park transformation;
respectively calculating a d-axis control signal and a q-axis control signal;
performing park inverse transformation on the d-axis control signal and the q-axis control signal to respectively obtain reference wave signals;
and respectively comparing the reference wave signal with the triangular carrier wave signal to obtain a photovoltaic inverter control signal.
6. The photovoltaic inverter control method for suppressing voltage violations of claim 5, wherein:
the d-axis control signal and the q-axis control signal are:
S n,d ＝E n,d -ωL+U n,d
S n,q ＝E n,q +ωL+U n,q
wherein, omega is the angular frequency of the alternating voltage, L is the equivalent inductance of the filter at the alternating current side of the nth photovoltaic inverter, E n,d Is a d-axis signal, E n,q Is a q-axis signal, U n,d Is d-axis voltage value, U n,q Is the q-axis voltage value.
7. The photovoltaic inverter control method for suppressing voltage violations of claim 5, wherein:
after comparing the reference wave signal with the triangular carrier wave signal, acquiring a photovoltaic inverter control signal, including:
when the reference wave signal value is larger than the triangular carrier signal value, controlling the upper bridge arm of the photovoltaic inverter to be conducted and the lower bridge arm to be switched off; when the value of the reference wave signal is less than the value of the triangular carrier signal, and controlling the upper bridge arm of the photovoltaic inverter to be switched off and the lower bridge arm of the photovoltaic inverter to be switched on.
8. A photovoltaic inverter control system for suppressing voltage violations, characterized by:
the method comprises the following steps:
a voltage out-of-limit determination module configured to: judging whether the actual operating voltage of the nth photovoltaic access node exceeds the limit or not;
an out-of-limit control module configured to: if the number of the photovoltaic access nodes exceeds the limit, sequencing the photovoltaic access nodes from small to large according to equivalent line impedance of the shortest line of the rest N-1 photovoltaic access nodes and the nth photovoltaic access node, and sequentially setting the power factor angle of the photovoltaic inverter of each photovoltaic access node according to a sequencing result;
an out-of-limit control module configured to: if the output power factor angle of the photovoltaic inverter of the nth photovoltaic access node is not out of limit, setting the output power factor angle of the photovoltaic inverter of the nth photovoltaic access node according to the actual operating voltage value; after the output power factor angle is set, the photovoltaic inverter is controlled until a preset signal processing time interval, re-executing the step of judging whether the actual operating voltage of the nth photovoltaic access node exceeds the limit;
an actual operating voltage re-determination module configured to: and re-acquiring the actual operating voltage of the nth photovoltaic access node, when the re-acquired actual operating voltage of the nth photovoltaic access node is greater than the minimum value of the allowable operating voltage of the nth photovoltaic access node and is less than the maximum value of the allowable operating voltage of the nth photovoltaic access node, re-executing the step of judging whether the actual operating voltage of the nth photovoltaic access node is out of limit, otherwise, continuously setting the output power factor angles of the photovoltaic inverters of other photovoltaic access nodes until all the rest N-1 photovoltaic inverters are completely set.
9. A computer-readable storage medium, on which a program is stored, which program, when being executed by a processor, carries out the steps of the method for photovoltaic inverter control for suppressing voltage violations as set forth in any one of claims 1-7.
10. An electronic device comprising a memory, a processor and a program stored on the memory and executable on the processor, wherein the processor when executing the program implements the steps in the method for photovoltaic inverter control for suppressing voltage violations as claimed in any of claims 1-7.
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