CN111082453A - Method and system for controlling photovoltaic inverter to adjust based on V-f - Google Patents
Method and system for controlling photovoltaic inverter to adjust based on V-f Download PDFInfo
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- CN111082453A CN111082453A CN201911226843.2A CN201911226843A CN111082453A CN 111082453 A CN111082453 A CN 111082453A CN 201911226843 A CN201911226843 A CN 201911226843A CN 111082453 A CN111082453 A CN 111082453A
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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
- H02J3/46—Controlling of the sharing of output between the generators, converters, or transformers
Abstract
The invention discloses a method and a system for controlling a photovoltaic inverter to adjust based on V-f, and belongs to the technical field of power systems. The method comprises the following steps: the method comprises the steps that photovoltaic parameters of an inner ring current control link of a photovoltaic inverter are obtained, and a reactive current reference value and an active current reference value are determined according to the parameters of the inner ring current control link of the photovoltaic inverter; and determining a reference current according to the reactive current reference value and the active current reference value, and if the reference current meets the minimum and maximum current limits of the photovoltaic inverter, controlling and adjusting the photovoltaic inverter by using the reference current. According to the invention, an additional dynamic V-f control link is added in the photovoltaic inverter, and the current limit values are dynamically adjusted according to the current limit of the inverter, so that the safe and stable operation of the photovoltaic is ensured on the basis of meeting the frequency modulation and voltage regulation requirements of the system.
Description
Technical Field
The invention relates to the technical field of power systems, in particular to a method and a system for controlling regulation of a photovoltaic inverter based on V-f.
Background
With the gradual completion of the exploitation and supply of global fossil energy, and the aggravation of greenhouse climate, countries in the world recognize the importance of renewable energy, especially photovoltaic and photovoltaic development, and pay high attention to photovoltaic development, and further the global photovoltaic industry is rapidly developed. Due to policy support, cost reduction, technology maturity and capital influx, the installed capacity and annual energy production of photovoltaic power generation keep rapidly increasing, and the clean alternative effect of renewable energy sources is increasingly obvious.
The number of nationwide concentrated photovoltaic average annual usage hours in 2018 is 1205 hours, which remains substantially the same as the previous year. The total light rejection rate and the total light rejection power of the photovoltaic power generation are reduced at the same time, wherein the light rejection rate is 3.0%, the light rejection rate is reduced by 2.8 percentage points on a same scale, and the light rejection power is reduced by 55 hundred million kilowatt hours and 18 hundred million kilowatt hours on a same scale. If the light abandoning rate is not more than 3 percent, the light abandoning range is further reduced, the light abandoning rate of the inner Mongolia is reduced to be within 2 percent, wherein the light abandoning rate of more than 3 percent is only in five provinces in northwest, the light abandoning rates of Xinjiang, Gansu, Qinghai, Ningxia and Shaanxi are respectively 16 percent, 10 percent, 5 percent, 4 percent and 6 percent, and the light abandoning rates of the Xinjiang, Gansu, Qinghai, Ningxia and Shaanxi are respectively reduced by 6 percent, 10 percent, 1 percent, 2 percent and. However, the light abandoning rate and the total light abandoning amount of large-scale new energy concentrated sending areas are still large, and in the clean energy consumption action plan (2018) 2020 issued by the national energy agency, the average light abandoning rate in China is required to be lower than 5% in 2018, lower than 5% in 2019 and lower than 5% in 2020, which raises a step for the requirements of photovoltaic power generation technology, particularly for frequency modulation and voltage regulation control.
The main reasons for abandoning photovoltaic light and electricity are the frequency and voltage problems of a power system, especially the frequency and voltage problems of a large-scale renewable energy base sent out by extra-high voltage direct current, which mainly show that the voltage transient state rising problem caused by the failure of phase commutation of direct current and the frequency stability problem of a sending-end power grid caused by direct current unipolar locking or bipolar locking both can cause great threat to the operation of the sending-end power grid, and simultaneously, higher requirements are provided for the fault ride-through capability of a photovoltaic inverter.
Disclosure of Invention
In order to solve the problem, the invention provides a method for controlling the regulation of a photovoltaic inverter based on V-f, which comprises the following steps:
acquiring inner loop current control link parameters of the photovoltaic inverter, and determining a reactive current reference value and an active current reference value according to the inner loop current control link parameters of the photovoltaic inverter;
and determining a reference current according to the reactive current reference value and the active current reference value, and if the reference current meets the photovoltaic preset condition, controlling and adjusting the photovoltaic inverter by using the reference current.
Optionally, the inner-loop control link includes: the device comprises a rapid voltage response control link, a deviation solving link, a filtering link, a dead zone link, a first series correction link, a second series correction link, an increment amplitude limiting link, a superposition link and an amplitude limiting link.
Alternatively, the formula for determining the reference current is as follows:
wherein, IrefIs reference current, l'qrefIs a reactive current reference value and I'drefIs the active current reference value.
Optionally, the preset condition specifically includes:
Imin≤Iref≤Imax
wherein, IminIs the minimum current limit and I of the invertermaxIs the maximum current limit of the inverter.
Optionally, the method further comprises:
an additional voltage-frequency V-f control link is added in an inner loop current control link of the photovoltaic inverter.
The invention also provides a system for controlling the regulation of the photovoltaic inverter based on V-f, which comprises the following components:
the parameter acquisition module is used for acquiring parameters of an inner ring current control link of the photovoltaic inverter and determining a reactive current reference value and an active current reference value according to the parameters of the inner ring current control link of the photovoltaic inverter;
and the second control module determines a reference current according to the reactive current reference value and the active current reference value, and controls and adjusts the photovoltaic inverter by using the reference current if the reference current meets a preset condition photovoltaic.
Optionally, the inner-loop control link includes: the device comprises a rapid voltage response control link, a deviation solving link, a filtering link, a dead zone link, a first series correction link, a second series correction link, an increment amplitude limiting link, a superposition link and an amplitude limiting link.
Alternatively, the formula for determining the reference current is as follows:
wherein, IrefIs reference current, l'qrefIs a reactive current reference value and I'drefIs the active current reference value.
Optionally, the preset condition specifically includes:
Imin≤Iref≤Imax
wherein, IminIs the minimum current limit and I of the invertermaxIs the maximum current limit of the inverter.
Optionally, the system further comprises:
the first control module controls an inner loop current control link of the photovoltaic inverter and adds an additional V-f control link.
According to the invention, an additional dynamic V-f control link is added in the photovoltaic inverter, and the current limit values are dynamically adjusted according to the current limit of the inverter, so that the safe and stable operation of the photovoltaic is ensured on the basis of meeting the frequency modulation and voltage regulation requirements of the system.
Drawings
FIG. 1 is a flow chart of a method for controlling regulation of a photovoltaic inverter based on V-f in accordance with the present invention;
FIG. 2 is a diagram of an inner loop control link of a method for controlling regulation of a photovoltaic inverter based on V-f according to the present invention;
FIG. 3 is a frequency disturbance test result chart of a method for controlling photovoltaic inverter regulation based on V-f according to the present invention;
FIG. 4 is a graph of the test results of a voltage perturbation test of a method for controlling regulation of a photovoltaic inverter based on V-f in accordance with the present invention;
fig. 5 is a diagram of a system for controlling regulation of a photovoltaic inverter based on V-f according to the present invention.
Detailed Description
The exemplary embodiments of the present invention will now be described with reference to the accompanying drawings, however, the present invention may be embodied in many different forms and is not limited to the embodiments described herein, which are provided for complete and complete disclosure of the present invention and to fully convey the scope of the present invention to those skilled in the art. The terminology used in the exemplary embodiments illustrated in the accompanying drawings is not intended to be limiting of the invention. In the drawings, the same units/elements are denoted by the same reference numerals.
Unless otherwise defined, terms (including 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. Further, it will be understood that terms, such as those defined in commonly used dictionaries, should be interpreted as having a meaning that is consistent with their meaning in the context of the relevant art and will not be interpreted in an idealized or overly formal sense.
The invention provides a method for controlling a photovoltaic inverter to adjust based on V-f, which comprises the following steps of:
adding an additional V-f control link in an inner loop current control link of the photovoltaic inverter;
the inner loop control link, as shown in fig. 2, includes: the device comprises a rapid voltage response control link, a deviation solving link, a filtering link, a dead zone link, a first series correction link, a second series correction link, an increment amplitude limiting link, a superposition link and an amplitude limiting link.
Wherein, VtFor photovoltaic inverter grid-connected point voltage, ItFor grid-connected current of photovoltaic inverter, XcFor additional compensating reactance, # is an additional compensation factor angle, UcIs the compensated grid-connected point voltage T of the photovoltaic invertervIs a first order filtering element time constant, Tv1And Tv2Respectively, the time constant, T, of the first series correction elementv3And Tv4Respectively, the second series correction link time constant, KvDC gain, K, for the series correction elementvvSelection of a factor, K, for the integral correction elementvvWhen 0 is the pure integral correction, KvvProportional integral correction when 1, Δ Iqmax and Δ IqminRespectively, the upper and lower limits of the incremental value of the reactive current, IqordIs a reactive current command value, IqmaxAnd IqminRespectively the upper and lower limits of the reactive current reference value.
Wherein ftFor photovoltaic inverter terminal grid-connected point frequency, TfIs a first order filtering element time constant, Tf1And Tf2Respectively, the time constant, T, of the first series correction elementf3And Tf4Respectively a second series connectionTime constant of positive loop, Kf is DC gain of series correction loop, KvfSelection of a factor, K, for the integral correction elementvfWhen 0 is the pure integral correction, KvfWhen the value is 1, the correction is proportional integral.
Acquiring inner loop current control link parameters of the photovoltaic inverter, and determining a reactive current reference value and an active current reference value according to the inner loop current control link parameters of the photovoltaic inverter;
and determining a reference current according to the reactive current reference value and the active current reference value, and controlling and adjusting the voltage and the frequency of the photovoltaic inverter by using the reference current if the reference current meets a preset condition.
The frequency perturbation test results are shown in fig. 3, and the voltage perturbation test results are shown in fig. 4.
The formula for determining the reference current is as follows:
wherein, IrefIs reference current, l'qrefIs a reactive current reference value and I'drefIs the active current reference value.
The reference current meets the preset condition photovoltaic, and specifically comprises the following steps:
Imin≤Iref≤Imax
wherein, IminIs the minimum current limit and I of the invertermaxIs the maximum current limit of the inverter.
The present invention further provides a system 200 for controlling regulation of a photovoltaic inverter based on V-f, as shown in fig. 5, comprising:
the first control module 201 controls an inner loop current control link of the photovoltaic inverter and adds an additional V-f control link;
the parameter obtaining module 202 is used for obtaining parameters of an inner ring current control link of the photovoltaic inverter and determining a reactive current reference value and an active current reference value according to the parameters of the inner ring current control link of the photovoltaic inverter;
and the second control module 203 determines a reference current according to the reactive current reference value and the active current reference value, and controls and adjusts the photovoltaic inverter by using the reference current if the reference current meets a preset condition photovoltaic.
The inner ring control link comprises: the device comprises a rapid voltage response control link, a deviation solving link, a filtering link, a dead zone link, a first series correction link, a second series correction link, an increment amplitude limiting link, a superposition link and an amplitude limiting link.
The formula for determining the reference current is as follows:
wherein, IrefIs reference current, l'qrefIs a reactive current reference value and I'drefIs the active current reference value.
The preset condition photovoltaic specifically comprises the following steps:
Imin≤Iref≤Imax
wherein, IminIs the minimum current limit and I of the invertermaxIs the maximum current limit of the inverter.
According to the invention, an additional dynamic V-f control link is added in the photovoltaic inverter, and the current limit values are dynamically adjusted according to the current limit of the inverter, so that the safe and stable operation of the photovoltaic is ensured on the basis of meeting the frequency modulation and voltage regulation requirements of the system.
As will be appreciated by one skilled in the art, embodiments of the present application may be provided as a method, system, or computer program product. Accordingly, the present application may take the form of an entirely hardware embodiment, an entirely software embodiment or an embodiment combining software and hardware aspects. Furthermore, the present application 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, CD-ROM, optical storage, and the like) having computer-usable program code embodied therein.
The present application is described with reference to flowchart illustrations and/or block diagrams of methods, apparatus (systems), and computer program products according to embodiments of the application. 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.
Finally, it should be noted that: the above embodiments are only for illustrating the technical solutions of the present invention and not for limiting the same, and although the present invention is described in detail with reference to the above embodiments, those of ordinary skill in the art should understand that: modifications and equivalents may be made to the embodiments of the invention without departing from the spirit and scope of the invention, which is to be covered by the claims.
Claims (10)
1. A method of controlling photovoltaic inverter regulation based on V-f, the method comprising:
acquiring inner loop current control link parameters of the photovoltaic inverter, and determining a reactive current reference value and an active current reference value according to the inner loop current control link parameters of the photovoltaic inverter;
and determining a reference current according to the reactive current reference value and the active current reference value, and if the reference current meets the photovoltaic preset condition, controlling and adjusting the photovoltaic inverter by using the reference current.
2. The method of claim 1, the inner loop control element comprising: the device comprises a rapid voltage response control link, a deviation solving link, a filtering link, a dead zone link, a first series correction link, a second series correction link, an increment amplitude limiting link, a superposition link and an amplitude limiting link.
3. The method of claim 1, the formula for determining the reference current is as follows:
wherein, IrefIs reference current, l'qrefIs a reactive current reference value and I'drefIs the active current reference value.
4. The method according to claim 1, wherein the preset condition is specifically:
Imin≤Iref≤Imax
wherein, IminIs the minimum current limit and I of the invertermaxIs the maximum current limit of the inverter.
5. The method of claim 1, further comprising:
an additional voltage-frequency V-f control link is added in an inner loop current control link of the photovoltaic inverter.
6. A system for controlling a photovoltaic inverter to regulate current based on V-f, the system comprising:
the parameter acquisition module is used for acquiring parameters of an inner ring current control link of the photovoltaic inverter and determining a reactive current reference value and an active current reference value according to the parameters of the inner ring current control link of the photovoltaic inverter;
and the second control module determines a reference current according to the reactive current reference value and the active current reference value, and controls and adjusts the photovoltaic inverter by using the reference current if the reference current meets a preset condition.
7. The system of claim 6, the inner loop control element comprising: the device comprises a rapid voltage response control link, a deviation solving link, a filtering link, a dead zone link, a first series correction link, a second series correction link, an increment amplitude limiting link, a superposition link and an amplitude limiting link.
8. The system of claim 6, the formula for determining the reference current is as follows:
wherein, IrefIs reference current, l'qrefIs a reactive current reference value and I'drefIs the active current reference value.
9. The system according to claim 6, wherein the photovoltaic preset condition is specifically:
Imin≤Iref≤Imax
wherein, IminIs the minimum current limit and I of the invertermaxIs the maximum current limit of the inverter.
10. The system of claim 1, further comprising:
the first control module controls an inner loop current control link of the photovoltaic inverter and adds an additional V-f control link.
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2019
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| US20140316604A1 (en) * | 2011-12-16 | 2014-10-23 | Egon Ortjohann | Method for active control of frequency and voltage in a power supply grid with decentralized power supply systems |
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| CN108110784A (en) * | 2018-01-10 | 2018-06-01 | 重庆大学 | Reduce the control method that mixing double-fed enters operation risk under straight-flow system electric network fault |
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