CN110994644B - Inverter active current priority distribution method and system under frequency disturbance - Google Patents
Inverter active current priority distribution method and system under frequency disturbance Download PDFInfo
- Publication number
- CN110994644B CN110994644B CN201911226817.XA CN201911226817A CN110994644B CN 110994644 B CN110994644 B CN 110994644B CN 201911226817 A CN201911226817 A CN 201911226817A CN 110994644 B CN110994644 B CN 110994644B
- Authority
- CN
- China
- Prior art keywords
- current
- value
- grid
- active current
- inverter
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
Images
Classifications
-
- 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
- H02J3/24—Arrangements for preventing or reducing oscillations of power in networks
-
- 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
- H02J3/16—Circuit arrangements for ac mains or ac distribution networks for adjusting voltage in ac networks by changing a characteristic of the network load by adjustment of reactive power
-
- 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
- Y02E40/00—Technologies for an efficient electrical power generation, transmission or distribution
- Y02E40/30—Reactive power compensation
Abstract
The invention discloses a method and a system for preferentially distributing active current of an inverter under frequency disturbance, wherein the method comprises the following steps: acquiring power data of a grid-connected point of the new energy unit; when the new energy source unit is in frequency disturbance, calculating according to the electric power data to obtain an original active current adjustment value; calculating to obtain a dynamically distributed reactive current adjustment value according to the original active current adjustment value; adjusting the inverter of the new energy source unit according to the dynamically distributed reactive current adjustment value and the original active current adjustment value, and acquiring power data of a grid-connected point of the new energy source unit again; judging whether the new energy unit recovers the steady-state operation or not according to the re-collected power data; the method and the system ensure that the new energy unit can effectively participate in the voltage control and the frequency control of the power system by performing dynamic allocation control on the basis of frequency control output.
Description
Technical Field
The invention relates to the technical field of electric power, in particular to a method and a system for preferentially distributing active current of an inverter under frequency disturbance.
Background
In the case of large-scale renewable energy penetrating into the power system, the frequency regulation and voltage regulation of the power system are still undertaken by the conventional synchronous unit, meanwhile, the intermittent, fluctuating and incomplete controllability of the renewable energy cause the frequency and voltage problems of the system to be more prominent, and meanwhile, during the grid fault, the new energy unit may also protect the action from being disconnected, further deteriorating the stability of the system, such as the great british power failure occurring in 8, 9 and 2019, the wind farm and distributed photovoltaic are disconnected due to lightning strike, further deteriorating the system frequency, causing low-frequency load shedding action, cutting off about 5% of load, causing great power failure, and therefore, power electronic equipment (such as wind power and photovoltaic) is required to participate in the frequency and voltage regulation of the system. The active current and reactive current control of the power electronic equipment are decoupled, when the power electronic equipment simultaneously participates in frequency regulation and voltage regulation of a power system, the situation that the adjustable capacity cannot simultaneously meet the regulation requirements of the active power and the reactive power may occur, and under the condition of frequency disturbance, how to distribute the active power and the reactive power to enable the distribution to be more balanced and reasonable is a problem to be solved urgently.
Disclosure of Invention
In order to solve the problem that the proportion distribution of active and reactive currents is unbalanced under the condition of frequency disturbance, which may cause abnormality, the invention provides a method and a system for preferentially distributing the active current of an inverter under the condition of frequency disturbance, wherein the method and the system obtain a scheme for preferentially considering the active power distribution in a bearable current range of the inverter by performing dynamic distribution control on the basis of voltage control and frequency control output under the condition of frequency disturbance, and the method for preferentially distributing the active current of the inverter under the condition of frequency disturbance comprises the following steps:
acquiring power data of a grid-connected point of a new energy source unit, wherein the power data comprises grid-connected point voltage and power grid frequency;
monitoring the grid-connected point voltage and the power grid frequency, and if the grid-connected point voltage is not in a dead zone and the power grid frequency is in the dead zone, judging that the energy unit is under frequency disturbance;
when the new energy source unit is in frequency disturbance, calculating according to the electric power data to obtain an original active current adjustment value;
calculating to obtain a dynamically distributed reactive current adjustment value according to the original active current adjustment value;
and adjusting the inverter of the new energy source unit according to the dynamically distributed reactive current adjustment value and the original active current adjustment value.
Further, electric power data of the grid-connected point of the new energy source unit is collected again;
and judging whether the new energy source unit recovers the steady-state operation or not according to the re-acquired power data.
Further, calculating to obtain a dynamically allocated reactive current adjustment value according to the original active current adjustment value, including:
judging whether the grid-connected point current adjusted by the original active current adjustment value meets the current threshold limit of the inverter or not;
if the current value does not meet the regulation value, under the condition of keeping the original active current regulation value, the reactive current is regulated to enable the grid-connected point current to meet the current threshold limit of the inverter, and the regulation value of the reactive current at the moment is taken as the reactive current regulation value under dynamic distribution.
Further, the determining whether the grid-connected point current adjusted by the original active current adjustment value satisfies the current threshold limit of the inverter includes:
calculating whether the root mean square value of the actual reactive current value and the active current reference value is within the current threshold limiting range of the inverter; the active current reference value is the sum of the actual active current value and an original active current adjustment value;
the root mean square value I ″ ord The calculation method is as follows:
wherein, I dord0 Is the actual active current value, I qord0 Is the actual reactive current value; delta' system dord The value is adjusted for the original active current.
Further, in a case that an original active current adjustment value is maintained, adjusting a reactive current so that the grid-connected point current satisfies a current threshold limit of the inverter, includes:
gradually reducing the reactive current value on the basis of the actual reactive current;
and when the root mean square value of the adjusted reactive current value and the active current reference value reaches the current threshold limit of the inverter, taking the reduced reactive current value interval as a reactive current adjustment value under dynamic allocation.
The inverter active current priority distribution system under the frequency disturbance comprises:
the acquisition unit is used for acquiring and obtaining power data of a grid-connected point of the new energy unit, wherein the power data comprises grid-connected point voltage, grid-connected point current and grid frequency;
the steady-state monitoring unit is used for monitoring the voltage of the grid-connected point and the frequency of the power grid, and if the voltage of the grid-connected point is not in a dead zone and the frequency of the power grid is in the dead zone, the energy unit is judged to be under frequency disturbance;
the adjustment control unit is used for calculating and obtaining an original active current adjustment value according to input power data;
the dynamic distribution unit is used for calculating and obtaining a reactive current adjustment value after dynamic distribution according to the original active current adjustment value;
the current adjusting unit is used for adjusting the inverter of the new energy source unit according to the dynamically distributed reactive current adjusting value and the original active current adjusting value;
further, the acquisition unit is used for acquiring the power data of the grid-connected point of the new energy source unit again after the current adjustment unit completes adjustment; and the steady-state monitoring unit is used for judging whether the new energy source unit recovers steady-state operation according to the newly collected power data.
Further, the dynamic allocation unit is configured to determine whether the grid-connected point current adjusted by the original active current adjustment value satisfies a current threshold limit of the inverter;
if the current does not meet the current threshold limit, the dynamic allocation unit is used for adjusting the reactive current under the condition that the original active current adjustment value is kept, so that the grid-connected point current meets the current threshold limit of the inverter, and the adjustment value of the reactive current at the moment is taken as the reactive current adjustment value under dynamic allocation.
Further, the dynamic allocation unit is configured to calculate whether a root mean square value of an actual reactive current value and an active current reference value is within a current threshold limit range of the inverter; the active current reference value is the sum of the actual active current value and an original active current adjustment value;
the root mean square value I ″ ord The calculation method of (A) is as follows:
wherein, I dord0 Is the actual active current value, I qord0 Is the actual reactive current value; delta' system dord The value is adjusted for the original active current.
Further, the dynamic allocation unit is used for gradually reducing the reactive current value on the basis of the actual reactive current;
and when the root mean square value of the adjusted reactive current value and the active current reference value reaches the current threshold limit of the inverter, taking the reduced reactive current value interval as a reactive current adjustment value under dynamic allocation.
The invention has the beneficial effects that: the technical scheme of the invention provides a method and a system for preferentially distributing the active current of an inverter under frequency disturbance, and the method and the system obtain the optimal active and reactive current distribution scheme within the bearable current range of the inverter by performing dynamic distribution control on the basis of frequency control output under the condition that only frequency is disturbed, thereby ensuring that a new energy unit can effectively participate in voltage control and frequency control of a power system.
Drawings
A more complete understanding of exemplary embodiments of the present invention may be had by reference to the following drawings in which:
fig. 1 is a flowchart of an inverter active current priority allocation method under frequency disturbance according to an embodiment of the present invention;
FIG. 2 is a schematic diagram of a voltage-frequency dynamic allocation control according to an embodiment of the present invention;
FIG. 3 is a diagram illustrating an original active current reactive current distribution control according to an embodiment of the present invention;
FIG. 4 is a schematic diagram of the proportional distribution of active and reactive currents under frequency disturbance according to an embodiment of the present invention;
fig. 5 is a structural diagram of an inverter active current priority distribution system under frequency disturbance according to an embodiment of 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.
Fig. 1 is a flowchart of an inverter active current priority allocation method under frequency disturbance according to an embodiment of the present invention;
the use scenario of the embodiment is that renewable energy is accessed to a power system; the method comprises the steps of collecting power data of a grid-connected point when a new energy unit (such as a wind turbine generator set and a photovoltaic generator set) of renewable energy is connected to a power grid.
judging whether the new energy source unit is in the condition of voltage disturbance by monitoring the running state of the grid-connected point voltage and judging whether the running state is in a preset dead zone; judging whether the new energy unit is in the condition of frequency disturbance or not by monitoring the running state of the grid-connected point frequency and judging whether the running state is in a preset dead zone or not; in this embodiment, the problem of disturbance is solved by implementing proportional distribution of active and reactive currents in consideration of the fact that the new energy source unit is only in frequency disturbance.
further, as shown in fig. 2, an original reactive current adjustment value may be obtained through a voltage control link according to an input grid-connected point voltage, a grid-connected point current, and a voltage reference value; and calculating to obtain an original active current distribution value through a frequency control link according to the input power grid frequency and the frequency reference value. In this embodiment, to implement the active current priority distribution, only the frequency control link is used to adjust the active current to obtain the original active current adjustment value Δ I ″ dord
Specifically, the voltage control link and the deviceA schematic diagram of a transfer function of the frequency control element is shown in fig. 3; inputting the voltage, current and frequency of the grid-connected point, and obtaining the original active current adjustment value Δ I ″ through the flow direction of the transfer function as shown in fig. 3 dord ；
as shown in fig. 2, since the active power is preferentially distributed and the reactive power is not suitable for the voltage control link, only the original active current adjustment value Δ I ″ is input dord And outputting the active current adjusting value after dynamic distribution through dynamic distribution control. Specifically, the method comprises the following steps:
step 141, judging whether the grid-connected point current adjusted by the original active current adjustment value meets the current threshold limit of the inverter;
calculating whether the root mean square value of the actual reactive current value and the active current reference value is within the current threshold limiting range of the inverter or not; the active current reference value is the sum of the actual active current value and an original active current adjustment value;
the root mean square value I ″ ord The calculation method of (A) is as follows:
wherein, I dord0 Is the actual active current value, I qord0 Is the actual reactive current value; delta I- dord The value is adjusted for the original active current.
And 142, if the current value is not satisfied, under the condition that the original active current adjustment value is kept, adjusting the reactive current to enable the grid-connected point current to satisfy the current threshold limit of the inverter, and taking the adjustment value of the reactive current at the moment as the reactive current adjustment value under dynamic distribution.
Gradually reducing the reactive current value on the basis of the actual reactive current;
and when the root mean square value of the adjusted reactive current value and the active current reference value reaches the current threshold limit of the inverter, taking the reduced reactive current value interval as a reactive current adjustment value under dynamic allocation.
And 150, adjusting the inverter of the new energy source unit according to the dynamically distributed reactive current adjustment value and the original active current adjustment value.
Further, after the step 150, the method further includes:
the power data of the grid-connected point of the new energy source unit is collected again;
and judging whether the new energy source unit recovers the steady-state operation or not according to the re-collected power data.
For the dynamic allocation method of step 140, fig. 4 is a schematic diagram of the proportional allocation of active and reactive currents under the frequency disturbance according to the embodiment of the present invention; by taking the active current as an abscissa and the reactive current as an ordinate, a coordinate system is established to illustrate the inverter active current priority distribution method under the frequency disturbance, as shown in fig. 4:
(Vector)
the projection on the abscissa is the actual active current value; vector quantity
The projection on the ordinate is the actual reactive current value; vector quantity
The current value is the current value under the integration of the actual active current value and the reactive current value, and the value of the current value cannot exceed the range of a circle in the graph, wherein the range of the circle in the graph is the current threshold limit of the inverter.
(Vector)
Parallel to the abscissa, the vector representation of the original active current adjustment value is based on the actual reactive current value and the actual active current value (i.e. taking a as a starting point);
if the point C is beyond the circle of the graph (i.e., the calculated RMS value I ″) as described above ord I.e., OC out of the range of the circle), the adjusted current is said to exceed the current threshold limit of the inverter;
in order to ensure the preferential distribution of the active current, on the basis of the point C, the active current value is ensured to be unchanged, the reactive current value is gradually reduced, so that the point C moves to a point B on a circle along a direction parallel to the ordinate, and the adjusted vector
The projection on the abscissa is the reactive current adjustment value after dynamic distribution; and a vector
There is no adjustment on the abscissa, which projects as the original active current adjustment value.
Fig. 5 is a structural diagram of an inverter active current priority distribution system under a frequency disturbance according to an embodiment of the present invention, and as shown in fig. 5, the system includes:
the acquisition unit 510 is used for acquiring and obtaining power data of a grid-connected point of the new energy unit, wherein the power data comprises grid-connected point voltage, grid-connected point current and power grid frequency;
a steady-state monitoring unit 520, where the steady-state monitoring unit 520 is configured to monitor the grid-connected point voltage and the grid frequency, and if the grid-connected point voltage is not in a dead zone and the grid frequency is in the dead zone, determine that the grid energy unit is under frequency disturbance;
an adjustment control unit 530, wherein the adjustment control unit 530 is configured to calculate an original active current adjustment value according to the input power data;
further, the adjusting and controlling unit 530 is configured to calculate and obtain an original active current distribution value according to the input grid frequency and the frequency reference value.
A dynamic allocation unit 540, where the dynamic allocation unit 540 is configured to calculate and obtain a dynamically allocated reactive current adjustment value according to the original active current adjustment value;
further, the dynamic allocation unit 540 is configured to determine whether the grid-connected point current adjusted by the original active current adjustment value meets the current threshold limit of the inverter;
if the current value does not meet the preset dynamic distribution value, the dynamic distribution unit 540 is configured to adjust the reactive current under the condition that the original active current adjustment value is maintained, so that the grid-connected point current meets the current threshold limit of the inverter, and the adjustment value of the reactive current at this time is taken as the reactive current adjustment value under dynamic distribution.
Further, the dynamic allocation unit 540 is configured to calculate whether a root mean square value of the actual reactive current value and the active current reference value is within a current threshold limit range of the inverter; the active current reference value is the sum of the actual active current value and an original active current adjustment value;
the root mean square value I ″ ord The calculation method of (A) is as follows:
wherein, I dord0 Is the actual active current value, I qord0 Is the actual reactive current value; delta I- dord The value is adjusted for the original active current.
Further, the dynamic allocation unit 540 is configured to gradually decrease the reactive current value based on the actual reactive current;
and when the root mean square value of the adjusted reactive current value and the active current reference value reaches the current threshold limit of the inverter, taking the reduced reactive current value interval as a reactive current adjustment value under dynamic allocation.
A current adjusting unit 550, where the current adjusting unit 550 is configured to adjust an inverter of the new energy source unit according to the dynamically allocated reactive current adjustment value and an original active current adjustment value;
the collecting unit 510 is configured to re-collect the power data of the grid-connected point of the new energy source unit after the current adjusting unit 550 completes adjustment; the steady-state monitoring unit 520 is configured to determine whether the new energy source unit recovers steady-state operation according to the re-collected power data.
In the description provided herein, numerous specific details are set forth. However, it is understood that embodiments of the disclosure may be practiced without these specific details. In some instances, well-known methods, structures and techniques have not been shown in detail in order not to obscure an understanding of this description.
Those skilled in the art will appreciate that the modules in the device in an embodiment may be adaptively changed and disposed in one or more devices different from the embodiment. The modules or units or components in the embodiments may be combined into one module or unit or component, and furthermore, may be divided into a plurality of sub-modules or sub-units or sub-components. All of the features disclosed in this specification (including any accompanying claims, abstract and drawings), and all of the processes or elements of any method or apparatus so disclosed, may be combined in any combination, except combinations where at least some of such features and/or processes or elements are mutually exclusive. Each feature disclosed in this specification (including any accompanying claims, abstract and drawings) may be replaced by alternative features serving the same, equivalent or similar purpose, unless expressly stated otherwise. Reference to step numbers in this specification is only for distinguishing between steps and is not intended to limit the temporal or logical relationship between steps, which includes all possible scenarios unless the context clearly dictates otherwise.
Moreover, those of skill in the art will appreciate that while some embodiments described herein include some features included in other embodiments, not others, combinations of features of different embodiments are meant to be within the scope of the disclosure and form different embodiments. For example, any of the embodiments claimed in the claims can be used in any combination.
Various component embodiments of the disclosure may be implemented in hardware, or in software modules running on one or more processors, or in a combination thereof. The present disclosure may also be embodied as device or system programs (e.g., computer programs and computer program products) for performing a portion or all of the methods described herein. Such programs implementing the present disclosure may be stored on a computer-readable medium or may be in the form of one or more signals. Such a signal may be downloaded from an internet website, or provided on a carrier signal, or provided in any other form.
It should be noted that the above-mentioned embodiments illustrate rather than limit the disclosure, and that those skilled in the art will be able to design alternative embodiments without departing from the scope of the appended claims. The word "comprising" does not exclude the presence of elements or steps not listed in a claim. The word "a" or "an" preceding an element does not exclude the presence of a plurality of such elements. The disclosure may be implemented by means of hardware comprising several distinct elements, and by means of a suitably programmed computer. In the unit claims enumerating several systems, several of these systems may be embodied by one and the same item of hardware.
The foregoing is directed to embodiments of the present disclosure, and it is noted that numerous improvements, modifications, and variations may be made by those skilled in the art without departing from the spirit of the disclosure, and that such improvements, modifications, and variations are considered to be within the scope of the present disclosure.
Claims (6)
1. A method for preferentially distributing inverter active current under frequency disturbance, the method comprising:
acquiring power data of a grid-connected point of a new energy source unit, wherein the power data comprises grid-connected point voltage and power grid frequency;
monitoring the grid-connected point voltage and the power grid frequency, and if the grid-connected point voltage is not in a dead zone and the power grid frequency is in the dead zone, judging that the new energy unit is under frequency disturbance;
when the new energy source unit is in frequency disturbance, calculating according to the electric power data to obtain an original active current adjustment value;
calculating to obtain a dynamically distributed reactive current adjustment value according to the original active current adjustment value;
calculating to obtain a dynamically distributed reactive current adjustment value according to the original active current adjustment value, wherein the method comprises the following steps:
judging whether the grid-connected point current adjusted by the original active current adjustment value meets the current threshold limit of the inverter or not;
if the current does not meet the requirement, under the condition of keeping the original active current adjustment value, adjusting the reactive current to enable the grid-connected point current to meet the current threshold limit of the inverter, and taking the adjustment value of the reactive current at the moment as the reactive current adjustment value under dynamic distribution;
the judging whether the grid-connected point current adjusted by the original active current adjustment value meets the current threshold limit of the inverter includes:
calculating whether the root mean square value of the actual reactive current value and the active current reference value is within the current threshold limiting range of the inverter; the active current reference value is the sum of an actual active current value and an original active current adjustment value;
the root mean square value I ″ ord The calculation method is as follows:
wherein, I dord0 Is the actual active current value, I qord0 Is the actual reactive current value; delta I dord Adjusting the value for the original active current;
and adjusting the inverter of the new energy source unit according to the dynamically distributed reactive current adjustment value and the original active current adjustment value.
2. The method of claim 1, wherein: after the inverter of the new energy source unit is adjusted according to the dynamically allocated reactive current adjustment value and the original active current adjustment value, the method further includes: the power data of the grid-connected point of the new energy source unit is collected again;
and judging whether the new energy source unit recovers the steady-state operation or not according to the re-acquired power data.
3. The method of claim 1, wherein: under the condition of keeping an original active current regulation value, regulating reactive current to enable the grid-connected point current to meet current threshold limit of the inverter, wherein the method comprises the following steps: gradually reducing the reactive current value on the basis of the actual reactive current;
and when the root mean square value of the adjusted reactive current value and the active current reference value reaches the current threshold limit of the inverter, taking the reduced reactive current value interval as a reactive current adjustment value under dynamic allocation.
4. An inverter active current priority distribution system under frequency disturbance, the system comprising:
the acquisition unit is used for acquiring and obtaining power data of a grid-connected point of the new energy unit, and the power data comprises grid-connected point voltage and grid frequency;
the steady-state monitoring unit is used for monitoring the grid-connected point voltage and the power grid frequency, and if the grid-connected point voltage is not in a dead zone and the power grid frequency is in the dead zone, the new energy unit is judged to be in frequency disturbance;
the adjustment control unit is used for calculating and obtaining an original active current adjustment value according to input power data;
the dynamic distribution unit is used for calculating and obtaining a reactive current adjustment value after dynamic distribution according to the original active current adjustment value;
the dynamic distribution unit is used for judging whether the grid-connected point current regulated by the original active current regulation value meets the current threshold limit of the inverter or not;
if the current value does not meet the preset regulation value, the dynamic distribution unit is used for regulating reactive current under the condition of keeping the original active current regulation value, so that the grid-connected point current meets the current threshold limit of the inverter, and the regulation value of the reactive current at the moment is taken as the reactive current regulation value under dynamic distribution;
the judging whether the grid-connected point current adjusted by the original active current adjustment value meets the current threshold limit of the inverter includes:
calculating whether the root mean square value of the actual reactive current value and the active current reference value is within the current threshold limiting range of the inverter; the active current reference value is the sum of an actual active current value and an original active current adjustment value;
the root mean square value I ″ ord The calculation method is as follows:
wherein, I dord0 Is the actual active current value, I qord0 Is the actual reactive current value; delta I- dord Adjusting the value for the original active current;
and the current adjusting unit is used for adjusting the inverter of the new energy source unit according to the dynamically distributed reactive current adjusting value and the original active current adjusting value.
5. The system of claim 4, wherein:
the acquisition unit is used for acquiring the power data of the grid-connected point of the new energy source unit again after the current adjustment unit completes adjustment; and the steady-state monitoring unit is used for judging whether the new energy unit recovers steady-state operation according to the re-acquired power data.
6. The system of claim 4, wherein: the dynamic distribution unit is used for gradually reducing the reactive current value on the basis of the actual reactive current;
and when the root mean square value of the adjusted reactive current value and the active current reference value reaches the current threshold limit of the inverter, taking the reduced reactive current value interval as a reactive current adjustment value under dynamic allocation.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201911226817.XA CN110994644B (en) | 2019-12-04 | 2019-12-04 | Inverter active current priority distribution method and system under frequency disturbance |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201911226817.XA CN110994644B (en) | 2019-12-04 | 2019-12-04 | Inverter active current priority distribution method and system under frequency disturbance |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN110994644A CN110994644A (en) | 2020-04-10 |
| CN110994644B true CN110994644B (en) | 2022-12-20 |
Family
ID=70089944
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201911226817.XA Active CN110994644B (en) | 2019-12-04 | 2019-12-04 | Inverter active current priority distribution method and system under frequency disturbance |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN110994644B (en) |
Family Cites Families (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104527462A (en) * | 2014-11-24 | 2015-04-22 | 西南交通大学 | Existing traction power supply system based improved parallel through type traction power supply system |
| CN109936169A (en) * | 2017-12-15 | 2019-06-25 | 台达电子企业管理（上海）有限公司 | Uneven and harmonic power distribution control method and device between shunt chopper |
| CN108879721B (en) * | 2018-06-15 | 2021-11-02 | 国网河南省电力公司电力科学研究院 | Frequency control method based on wind power consumption |
| CN109755961B (en) * | 2019-01-25 | 2022-03-04 | 中国电力科学研究院有限公司 | Active control parameter setting method based on second-level power disturbance of photovoltaic power station |
| CN109787282B (en) * | 2019-01-29 | 2022-09-02 | 国电南瑞科技股份有限公司 | Large-scale energy storage participation new energy station reactive power coordination control method and system |
| CN109873458B (en) * | 2019-03-07 | 2021-07-23 | 国网宁夏电力有限公司电力科学研究院 | Reactive current reference value and active current reference value adjusting method and device |
| CN110488148B (en) * | 2019-07-30 | 2020-09-11 | 华为技术有限公司 | Islanding detection method and device and computer readable storage medium |
-
2019
- 2019-12-04 CN CN201911226817.XA patent/CN110994644B/en active Active
Also Published As
| Publication number | Publication date |
|---|---|
| CN110994644A (en) | 2020-04-10 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| WO2019128036A1 (en) | Photovoltaic power plant and primary frequency modulation control method therefor | |
| Aghatehrani et al. | Reactive power management of a DFIG wind system in microgrids based on voltage sensitivity analysis | |
| CN105762838B (en) | A kind of wind-powered electricity generation cluster reactive voltage multi objective control method | |
| AU2014200830A1 (en) | Photovoltaic power generation system, control method and control program for photovoltaic power generation system | |
| CN106611965B (en) | Wind power plant coordination control method and system for preventing large-scale wind power from frequently crossing | |
| WO2021012915A1 (en) | Active power-frequency control method and system for connection of communication-free offshore wind farm to grid via flexible direct-current system | |
| CN109088427B (en) | Method and system for determining minimum starting-up scheme of conventional unit in AC/DC hybrid power grid | |
| CN105939021A (en) | Power grid frequency control method of considering low voltage ride-through capability of fan | |
| Yoo et al. | Frequency stability support of a DFIG to improve the settling frequency | |
| US9871382B2 (en) | Method and controller for continuously operating a plurality of electric energy generating machines during a high voltage condition | |
| CN113595093B (en) | Reactive voltage automatic control method and device for new energy power station and storage medium | |
| CN108336743B (en) | local voltage control method based on distributed power supply grid-connected inverter | |
| CN110994644B (en) | Inverter active current priority distribution method and system under frequency disturbance | |
| CN107196319B (en) | Fan frequency modulation control method based on power disturbance value response | |
| CN105958535A (en) | Distributed power supply cluster control system and control method thereof | |
| CN111082433B (en) | Inverter reactive current priority distribution method and system under voltage disturbance | |
| CN111082471B (en) | Inverter active and reactive current dynamic distribution method and system under steady state | |
| CN111064233B (en) | Method and system for distributing active and reactive current proportion of inverter | |
| JP2017060325A (en) | Load frequency controller, load frequency control method, and program | |
| CN109995071B (en) | Distributed photovoltaic inverter layered coordination control strategy under fault | |
| Yan et al. | Impact of load frequency dependence on frequency response of a power system with high non-synchronous penetration | |
| CN106505581B (en) | The compensation method of photovoltaic combining inverter and device | |
| CN109888843B (en) | Power adjusting method and system for large-scale new energy to be accessed into direct-current power grid | |
| CN110021951B (en) | Security control design method and system for multi-direct-current feed-in receiving-end extra-high voltage ring network | |
| CN109462233B (en) | Power grid frequency safety degree dividing method and device for high-power loss |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant |