CN113285471B - Offshore wind farm subsynchronous oscillation source sensing and positioning method, device and equipment - Google Patents

Offshore wind farm subsynchronous oscillation source sensing and positioning method, device and equipment Download PDF

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CN113285471B
CN113285471B CN202110712095.XA CN202110712095A CN113285471B CN 113285471 B CN113285471 B CN 113285471B CN 202110712095 A CN202110712095 A CN 202110712095A CN 113285471 B CN113285471 B CN 113285471B
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subsynchronous
component
voltage
oscillation
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CN113285471A (en
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王红星
谢志文
余超耘
朱良合
尹海庆
郭敬梅
盛超
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Guangdong Power Grid Co Ltd
Electric Power Research Institute of Guangdong Power Grid Co Ltd
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Guangdong Power Grid Co Ltd
Electric Power Research Institute of Guangdong Power Grid Co Ltd
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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
    • H02J3/24—Arrangements for preventing or reducing oscillations of power in networks
    • H02J3/241—The oscillation concerning frequency
    • 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
    • H02J2300/28—The renewable source being wind energy
    • 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
    • Y02E10/70—Wind energy
    • Y02E10/76—Power conversion electric or electronic aspects

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  • Control Of Eletrric Generators (AREA)
  • Wind Motors (AREA)

Abstract

The invention relates to a method, a device and equipment for sensing and positioning a secondary super-synchronous oscillation source of an offshore wind power plant, wherein the method is characterized in that voltage data and current data of an element to be positioned, which is subjected to active oscillation by offshore wind power, are filtered to obtain a voltage secondary synchronous component, a current secondary synchronous component, a voltage super-synchronous component and a current super-synchronous component, then whether oscillation occurs is judged, if the oscillation occurs, the sum of active powers of the element to be positioned is calculated, and the position of the oscillation power of the element to be positioned is determined according to whether the sum of the active powers is smaller than a power threshold value, so that the sensing and positioning of the secondary super-synchronous oscillation source of the offshore wind power plant are realized. The method for sensing and positioning the subsynchronous oscillation source of the offshore wind power plant realizes the judgment of the subsynchronous oscillation, can effectively monitor the oscillation, and solves the technical problems that the existing method for sensing and monitoring the subsynchronous oscillation of the power system has low working efficiency and is not suitable for offshore wind power.

Description

Offshore wind farm subsynchronous oscillation source sensing and positioning method, device and equipment
Technical Field
The invention relates to the technical field of offshore wind power, in particular to a method, a device and equipment for sensing and positioning a secondary super-synchronous oscillation source of an offshore wind power field.
Background
Wind power generation has become an important point for new energy development since the 21 st century. In recent years, in wind power generation, a large number of wind turbines are abnormally off-grid due to the novel subsynchronous oscillation problem caused by dynamic interaction between the wind turbines and power electronic control thereof and an alternating current/direct current power grid, and the safe and stable operation of the power grid is threatened.
The offshore wind power has the characteristics of strong wind power resource stability, high annual utilization hours and the like, and the offshore wind power is subjected to soft direct grid connection, which means that more converter equipment in the system exist, and interaction between power electronic equipment exists, so that subsynchronous oscillation can be caused. Therefore, the sensing and positioning of the subsynchronous/supersynchronous oscillation sources of the offshore wind farm are needed, so that the analysis of the oscillation mechanism and the implementation of the oscillation inhibition measures are facilitated, and real-time monitoring and alarming are provided for operators.
The existing perception of the sub-synchronous oscillation of the offshore wind power is mainly to adopt a Phasor Measurement Unit (PMU) and a Wide Area Measurement System (WAMS) for measurement; the subsynchronous oscillation information is extracted using data measured by WAMS as in document [1 ]. The existing method for positioning the oscillating source of the offshore wind power subsynchronous oscillation mainly adopts the positioning of a forced oscillating source, and the positioning method aims at low-frequency oscillation; the positioning method of the forced disturbance oscillation source mainly comprises a hybrid dynamic simulation method, an energy function method, a frequency domain relation method and the like, for example, the literature [2] adopts the energy function method to position lower-frequency oscillation caused by the secondary/super-synchronous forced oscillation source; the method comprises the steps of collecting instantaneous values of voltage and current of an element port, calculating transient energy flow under a rotating coordinate system by adopting coordinate system transformation, fitting a curve to obtain energy flow power, and positioning an oscillation source. The phasor measurement unit realizes the discussion of sub-synchronous oscillation on-line identification and alarm [ J ]. Electric power system automation, 2016, 40 (16): 143-152. The doubly-fed wind turbines based on transient energy flow, in literature [2] Cao Na, zhao Xu ], forced oscillation source positioning [ J ]. Electric power system automation 2020, 44 (10): 103-118.
From the above, the existing method for sensing and monitoring the subsynchronous oscillations of the power system mainly aims at the fundamental component and does not pay attention to other frequency components except the fundamental component. In the offshore wind power system, due to the influence of a control link of the converter, a frequency coupling effect exists, in a subsynchronous oscillation event related to an offshore wind power field, subsynchronous components in 0-50Hz and supersynchronous components in 50-100Hz exist, so that the coupling effect of the converter is considered, and the sensing and monitoring methods of the subsynchronous oscillation of the existing power system are not suitable for positioning oscillation sources in two frequency ranges at the same time.
Disclosure of Invention
The embodiment of the invention provides a method, a device and equipment for sensing and positioning a subsynchronous oscillation source of an offshore wind power plant, which are used for solving the technical problems that the existing method for sensing and monitoring the subsynchronous oscillation of a power system is low in working efficiency and is not suitable for offshore wind power.
In order to achieve the above object, the embodiment of the present invention provides the following technical solutions:
a method for sensing and positioning a subsynchronous oscillation source of an offshore wind farm comprises the following steps:
acquiring voltage data and current data of an element to be positioned, wherein active oscillation of offshore wind power occurs;
sequentially performing band-stop filtering and band-pass filtering on the voltage data and the current data to obtain a voltage subsynchronous component, a current subsynchronous component, a voltage supersynchronous component and a current supersynchronous component;
if the current subsynchronous component and the current supersynchronous component meet oscillation occurrence conditions, calculating according to the voltage subsynchronous component, the current subsynchronous component, the voltage supersynchronous component and the current supersynchronous component to obtain instantaneous subsynchronous active power and instantaneous supersynchronous active power;
adding the instantaneous subsynchronous active power and the instantaneous supersynchronous active power to obtain an active power sum; if the active power sum is less than a power threshold, the element to be positioned is actively oscillated within a sub/super synchronous frequency range.
Preferably, the offshore wind farm subsynchronous oscillation source sensing and positioning method comprises the following steps: and acquiring voltage and current data of the element to be positioned again to serve as correction data, analyzing the correction data by adopting Fourier analysis to obtain phasor active power of the element to be positioned, and if the phasor active power is smaller than a power threshold value, completing correction of active oscillation of the element to be positioned in a secondary/super-synchronous frequency range.
Preferably, the step of analyzing the correction data using fourier analysis to obtain the phasor active power of the element to be positioned comprises:
analyzing the correction data by adopting Fourier analysis to obtain voltage amplitude, current amplitude, voltage phase angle and current phase angle corresponding to the correction data;
and calculating according to the voltage amplitude, the current amplitude, the voltage phase angle and the current phase angle to obtain the phasor active power of the element to be positioned.
Preferably, the offshore wind farm subsynchronous oscillation source sensing and positioning method comprises the following steps: if the active power sum is not less than the power threshold, the element to be positioned does not undergo active oscillation in the secondary/super-synchronous frequency range.
Preferably, the fact that the current subsynchronous component and the current supersynchronous component both meet the oscillation occurrence condition means that the magnitudes of the current subsynchronous component and the current supersynchronous component are set between a rated current amplitude lower limit value and a rated current amplitude upper limit value, and the rated current amplitude lower limit value and the rated current amplitude upper limit value are respectively the minimum rated current and the maximum rated current which are allowed to pass through the element to be positioned of offshore wind power under the rated working condition.
Preferably, the power threshold is 0.
Preferably, the step of sequentially performing band-stop filtering and band-pass filtering on the voltage data and the current data to obtain a voltage subsynchronous component, a current subsynchronous component, a voltage supersynchronous component and a current supersynchronous component includes:
filtering the power frequency components from the voltage data and the current data by using a band-stop filter to obtain corresponding first filtering components and second filtering components;
and filtering the first filtering component and the second filtering component according to the subsynchronous frequency range and the supersynchronous frequency range by adopting two parallel bandpass filters to obtain a voltage subsynchronous component, a current subsynchronous component, a voltage supersynchronous component and a current supersynchronous component.
Preferably, the subsynchronous frequency ranges from 3Hz to 47Hz, and the supersynchronous frequency ranges from 53Hz to 97Hz.
The invention also provides a device for sensing and positioning the subsynchronous oscillation source of the offshore wind farm, which comprises a data acquisition module, a filtering processing module, a power calculation module and an identification and positioning module;
the data acquisition module is used for acquiring voltage data and current data of the element to be positioned, wherein the element to be positioned is subjected to active oscillation of offshore wind power;
the filtering processing module is used for sequentially carrying out band-stop filtering and band-pass filtering processing on the voltage data and the current data to obtain a voltage subsynchronous component, a current subsynchronous component, a voltage supersynchronous component and a current supersynchronous component;
the power calculation module is used for obtaining instantaneous subsynchronous active power and instantaneous oversynchronous active power according to the fact that the current subsynchronous component and the current oversynchronous component meet oscillation occurrence conditions and according to the voltage subsynchronous component, the current subsynchronous component, the voltage oversynchronous component and the current oversynchronous component;
the identification positioning module is used for adding the instantaneous subsynchronous active power and the instantaneous supersynchronous active power to obtain an active power sum; and obtaining that the active oscillation of the element to be positioned occurs in the secondary/super synchronous frequency range according to the fact that the sum of the active powers is smaller than a power threshold value.
The invention also provides a device for sensing and positioning the subsynchronous oscillation source of the offshore wind farm, which comprises a processor and a memory;
the memory is used for storing program codes and transmitting the program codes to the processor;
the processor is used for executing the offshore wind farm subsynchronous oscillation source sensing and positioning method according to the instructions in the program codes.
From the above technical solutions, the embodiment of the present invention has the following advantages: the method comprises the steps of filtering voltage data and current data of an element to be positioned, which is subjected to active oscillation by offshore wind power, to obtain a voltage subsynchronous component, a current subsynchronous component, a voltage supersynchronous component and a current supersynchronous component, judging whether oscillation occurs or not, calculating the sum of active powers of the element to be positioned again if oscillation occurs, and determining the position of oscillation power of the element to be positioned according to whether the sum of the active powers is smaller than a power threshold value or not, so as to realize the sensing and positioning of the offshore wind power field subsynchronous oscillation source. The method for sensing and positioning the subsynchronous oscillation source of the offshore wind power plant realizes the judgment of the subsynchronous oscillation, can effectively monitor the oscillation, and solves the technical problems that the existing method for sensing and monitoring the subsynchronous oscillation of the power system has low working efficiency and is not suitable for offshore wind power.
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In order to more clearly illustrate the embodiments of the invention or the technical solutions of the prior art, the drawings which are used in the description of the embodiments or the prior art will be briefly described, it being obvious that the drawings in the description below are only some embodiments of the invention, and that other drawings can be obtained from these drawings without inventive faculty for a person skilled in the art.
Fig. 1 is a flow chart of steps of a method for sensing and positioning a subsynchronous oscillation source of an offshore wind farm according to an embodiment of the invention.
FIG. 2 is a topological structure diagram of offshore wind power according to an embodiment of the invention.
FIG. 3 is a frame diagram of a filtering process of a method for sensing and positioning a subsynchronous oscillation source of an offshore wind farm according to an embodiment of the invention.
FIG. 4 is a flowchart illustrating a method for sensing and positioning a subsynchronous oscillation source of an offshore wind farm according to another embodiment of the present invention.
Fig. 5 is a frame diagram of a device for sensing and positioning a subsynchronous oscillation source of an offshore wind farm according to an embodiment of the invention.
Detailed Description
In order to make the objects, features and advantages of the present invention more comprehensible, the technical solutions in the embodiments of the present invention are described in detail below with reference to the accompanying drawings, and it is apparent that the embodiments described below are only some embodiments of the present invention, but not all embodiments of the present invention. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
The embodiment of the application provides a method, a device and equipment for sensing and positioning a subsynchronous oscillation source of an offshore wind power plant, which are used for solving the technical problems that the existing method for sensing and monitoring the subsynchronous oscillation of a power system is low in working efficiency and is not suitable for offshore wind power.
Embodiment one:
fig. 1 is a flow chart of steps of a method for sensing and positioning a secondary super-synchronous oscillation source of an offshore wind farm according to an embodiment of the present invention, fig. 2 is a topological structure diagram of offshore wind power according to an embodiment of the present invention, and fig. 3 is a frame diagram of filtering processing of the method for sensing and positioning the secondary super-synchronous oscillation source of the offshore wind farm according to an embodiment of the present invention.
As shown in fig. 1 to 3, the embodiment of the invention provides a method for sensing and positioning a subsynchronous oscillation source of an offshore wind farm, which comprises the following steps:
s10, acquiring voltage data and current data of an element to be positioned, wherein active oscillation of offshore wind power occurs.
In the power system of offshore wind power, the element to be positioned for active oscillation of offshore wind power comprises a wind power plant, a collector wire and a wind turbine generator. In an offshore wind power system, two parts of data are needed for analyzing the sensing and positioning of a secondary super-synchronous oscillation source of an offshore wind power station, namely voltage data and current data of an offshore wind power grid are accessed, and wind of offshore wind power is obtainedVoltage data and current data of the motor group ports. In the embodiment, the voltage data and the current data of the power grid mainly come from current collecting wires (usually 35 kV) in the wind power plant, which are measured by a PMU, and recording data of submarine cables (usually 110/220 kV) connected with the AC/DC power grid; the voltage data and the current data of the wind turbine generator are obtained through measurement of a voltage transformer and a current transformer in the wind turbine generator. As shown in FIG. 2, the voltage data and current data noted in the graph include fan-grid-tie point voltage v t Grid-connected point current i t Voltage v of 35kV 35 Current i of 35kV 35 Voltage v of 110kV 110 And 110kV current i 110 。
S20, carrying out band-stop filtering and band-pass filtering processing on the voltage data and the current data in sequence to obtain a voltage subsynchronous component, a current subsynchronous component, a voltage supersynchronous component and a current supersynchronous component.
It should be noted that, in step S20, the data obtained in step S10 is mainly filtered to obtain the subsynchronous component and the supersynchronous component of the current and the voltage, and the data is provided for oscillation judgment.
S30, if the current subsynchronous component and the current supersynchronous component meet oscillation occurrence conditions, calculating according to the voltage subsynchronous component, the current subsynchronous component, the voltage supersynchronous component and the current supersynchronous component, and obtaining instantaneous subsynchronous active power and instantaneous supersynchronous active power.
It should be noted that the fact that both the current sub-synchronous component and the current super-synchronous component satisfy the oscillation occurrence condition means that the magnitudes of the current sub-synchronous component and the current super-synchronous component are set between the rated current amplitude lower limit value and the rated current amplitude upper limit value. The lower limit value and the upper limit value of the rated current amplitude are respectively the minimum rated current and the maximum rated current allowed to pass through the element to be positioned of the offshore wind power under the rated working condition. In this embodiment, the current data (i 35 And i 110 ) For the purposes of illustration, whether their current subsynchronous component and current supersynchronous component satisfy the oscillation initiationFrequency and amplitude conditions are generated. Step S20 may obtain three-phase voltage sub-synchronous components
Figure GDA0004124076360000061
Three-phase current subsynchronous component->
Figure GDA0004124076360000062
Three-phase voltage supersynchronous component->
Figure GDA0004124076360000063
Figure GDA0004124076360000064
Three-phase current supersynchronous component->
Figure GDA0004124076360000065
/>
In the embodiment of the invention, the instantaneous subsynchronous active power is calculated
Figure GDA0004124076360000066
The formula of (2) is
Figure GDA0004124076360000067
Calculating instantaneous supersynchronous active power +.>
Figure GDA0004124076360000068
The formula of (2) is
Figure GDA0004124076360000069
K is an element to be positioned, a, b and c are three phases of a power grid respectively, sub is a subsynchronous component, and sup is a supersynchronous component.
S40, adding the instantaneous subsynchronous active power and the instantaneous supersynchronous active power to obtain the sum of the active power; if the active power sum is less than the power threshold, the element to be positioned oscillates actively in the sub/super synchronous frequency range.
The power threshold is preferably 0. If the sum of the active powers is smaller than 0, the element k to be positioned is shown to generate active oscillation in the secondary/super-synchronous frequency range, and is an active oscillation source and shows negative resistance characteristic. If the sum of the active power is not less than 0, the element k to be positioned does not induce active oscillation in the sub/super synchronous frequency range, the element k to be positioned absorbs the oscillating active power, and the element k to be positioned is an active oscillation sink. This makes it possible to determine the effect of the element k to be positioned on the oscillation.
According to the method for sensing and positioning the sub-super-synchronous oscillation source of the offshore wind power plant, provided by the invention, the voltage data and the current data of the element to be positioned, which are subjected to active oscillation by the offshore wind power, are filtered to obtain the voltage sub-synchronous component, the current sub-synchronous component, the voltage super-synchronous component and the current super-synchronous component, then whether oscillation occurs is judged, if oscillation occurs, the active power sum of the element to be positioned is calculated again, and the position of the oscillation power of the element to be positioned is determined according to whether the active power sum is smaller than a power threshold value, so that the sensing and positioning of the sub-super-synchronous oscillation source of the offshore wind power plant are realized. The method for sensing and positioning the subsynchronous oscillation source of the offshore wind power plant realizes the judgment of the subsynchronous oscillation, can effectively monitor the oscillation, and solves the technical problems that the existing method for sensing and monitoring the subsynchronous oscillation of the power system has low working efficiency and is not suitable for offshore wind power.
The method for sensing and positioning the subsynchronous oscillation source of the offshore wind farm can be used for evaluating the acceleration/inhibition effect of different wind farms and wind turbines on oscillation, so that reference information is provided for analysis of oscillation mechanism or oscillation inhibition measures.
FIG. 4 is a flowchart illustrating a method for sensing and positioning a subsynchronous oscillation source of an offshore wind farm according to another embodiment of the present invention.
As shown in fig. 4, in one embodiment of the present invention, the method for sensing and positioning a sub-super-synchronous oscillation source of an offshore wind farm includes: s50, acquiring voltage and current data of the element to be positioned again to serve as correction data, analyzing the correction data by adopting Fourier analysis to obtain phasor active power of the element to be positioned, and if the phasor active power is smaller than a power threshold value, completing correction of active oscillation of the element to be positioned in a secondary/super synchronous frequency range.
In the embodiment of the invention, the step of analyzing correction data by adopting Fourier analysis to obtain phasor active power of the element to be positioned comprises the following steps:
analyzing the correction data by adopting Fourier analysis to obtain voltage amplitude, current amplitude, voltage phase angle and current phase angle corresponding to the correction data;
and calculating according to the voltage amplitude, the current amplitude, the voltage phase angle and the current phase angle to obtain the phasor active power of the element to be positioned.
It should be noted that, in step S50, voltage data and current data of the element to be positioned for a certain period of time are collected again as correction data, the correction data are analyzed, and phasor active power of the element to be positioned is calculated according to the analyzed data. In the present embodiment, the phasor active power P of the element to be positioned is calculated ik The formula of (2) is: p (P) ik ＝U ik I ik cos(θ Uik -θ Iik )，θ Uik For the voltage phase angle, θ, of the element k to be positioned in the i oscillation mode Iik For the current phase angle of the element k to be positioned in the i oscillation mode, U ik For the voltage amplitude of the element k to be positioned in the I oscillation mode, I ik For the current amplitude of the element k to be positioned in the i oscillation mode. The correction data is also data acquired in the i oscillation mode. If phasor active power P ik <0, the element k to be positioned generates active oscillation in the ith oscillation mode (namely in the secondary/super synchronous frequency range), and the oscillation source is an active oscillation source and shows negative resistance characteristic; if phasor active power P ik And if the oscillation frequency is not smaller than 0, the element k to be positioned does not generate active oscillation in the ith oscillation mode (namely in the secondary/super-synchronous frequency range), the element k to be positioned absorbs the active oscillation power, and the oscillation source is an active oscillation sink.
In the embodiment of the invention, the offshore wind farm subsynchronous oscillation source sensing and positioning method performs verification on the result obtained in the step S40 through the step S50, which is equivalent to verifying the quick positioning result in the step S40 by using the theory of average power, distinguishing different oscillation modes, providing more oscillation characteristic information, further ensuring the accuracy of a conclusion and enabling the positioning method to have rapidity and accuracy.
In one embodiment of the present invention, the steps of sequentially performing band-stop filtering and band-pass filtering on the voltage data and the current data to obtain a voltage sub-synchronous component, a current sub-synchronous component, a voltage super-synchronous component and a current super-synchronous component include:
filtering the power frequency components of the voltage data and the current data by using a band-stop filter to obtain a corresponding first filtering component and a corresponding second filtering component;
and filtering the first filtering component and the second filtering component according to the subsynchronous frequency range and the supersynchronous frequency range by adopting two parallel bandpass filters to obtain a voltage subsynchronous component, a current subsynchronous component, a voltage supersynchronous component and a current supersynchronous component.
The filtered power frequency component can be illustrated by taking 50Hz as a case, and the order and the coefficient of the filter are set according to the cut-off frequency of the selected band-stop filter of 50Hz and the bandwidth of 5Hz, the power frequency component is filtered through the band-stop filter, and the obtained filtered first filtering component corresponding to the voltage data and the obtained second filtering component corresponding to the current data. After filtering the power frequency component, obtaining a first filtering component and a second filtering component, adopting two parallel band-pass filters, and respectively filtering out the frequency range f sso1 ～f sso2 And 50+f sso1 ～50+f sso2 And supersynchronous components to obtain voltage signals and current signals in the frequency range. Wherein f sso1 ＝3Hz，f sso2 ＝47H。
Embodiment two:
fig. 5 is a frame diagram of a device for sensing and positioning a subsynchronous oscillation source of an offshore wind farm according to an embodiment of the invention.
As shown in fig. 5, the embodiment of the invention further provides a device for sensing and positioning a secondary super-synchronous oscillation source of an offshore wind farm, which comprises an acquisition data module 10, a filtering processing module 20, a power calculation module 30 and an identification positioning module 40;
the acquisition data module 10 is used for acquiring voltage data and current data of an element to be positioned, wherein active oscillation of offshore wind power occurs;
the filtering processing module 20 is configured to sequentially perform band-stop filtering and band-pass filtering on the voltage data and the current data to obtain a voltage subsynchronous component, a current subsynchronous component, a voltage supersynchronous component and a current supersynchronous component;
the power calculation module 30 is configured to obtain an instantaneous subsynchronous active power and an instantaneous supersynchronous active power according to the current subsynchronous component and the current supersynchronous component that each satisfy an oscillation occurrence condition and according to the voltage subsynchronous component, the current subsynchronous component, the voltage supersynchronous component, and the current supersynchronous component;
an identification positioning module 40, configured to add the instantaneous subsynchronous active power and the instantaneous supersynchronous active power to obtain an active power sum; and obtaining that the element to be positioned generates active oscillation in the secondary/super-synchronous frequency range according to the fact that the sum of the active power is smaller than the power threshold.
It should be noted that, the modules in the apparatus of the second embodiment correspond to the steps in the method of the second embodiment, and the steps in the method of the second embodiment are described in detail in the first embodiment, and the details of the modules in the apparatus are not described in detail in the second embodiment.
Embodiment III:
the embodiment of the invention provides a sensing and positioning device for a subsynchronous oscillation source of an offshore wind farm, which comprises a processor and a memory;
a memory for storing program code and transmitting the program code to the processor;
and the processor is used for executing the offshore wind farm subsynchronous oscillation source sensing and positioning method according to the instructions in the program codes.
It should be noted that the processor is configured to execute the steps in the above embodiment of the method for sensing and positioning a subsynchronous oscillation source of an offshore wind farm according to instructions in the program code. In the alternative, the processor, when executing the computer program, performs the functions of the modules/units in the system/apparatus embodiments described above.
For example, a computer program may be split into one or more modules/units, which are stored in a memory and executed by a processor to complete the present application. One or more of the modules/units may be a series of computer program instruction segments capable of performing specific functions for describing the execution of the computer program in the terminal device.
The terminal device may be a computing device such as a desktop computer, a notebook computer, a palm computer, a cloud server, etc. The terminal device may include, but is not limited to, a processor, a memory. It will be appreciated by those skilled in the art that the terminal device is not limited and may include more or less components than those illustrated, or may be combined with certain components, or different components, e.g., the terminal device may also include input and output devices, network access devices, buses, etc.
The processor may be a central processing unit (Central Processing Unit, CPU), other general purpose processor, digital signal processor (Digital Signal Processor, DSP), application specific integrated circuit (Application Specific Integrated Circuit, ASIC), off-the-shelf Programmable gate array (FPGA) or other Programmable logic device, discrete gate or transistor logic device, discrete hardware components, or the like. A general purpose processor may be a microprocessor or the processor may be any conventional processor or the like.
The memory may be an internal storage unit of the terminal device, such as a hard disk or a memory of the terminal device. The memory may also be an external storage device of the terminal device, such as a plug-in hard disk provided on the terminal device, a Smart Media Card (SMC), a Secure Digital (SD) Card, a Flash memory Card (Flash Card), or the like. Further, the memory may also include both an internal storage unit of the terminal device and an external storage device. The memory is used for storing computer programs and other programs and data required by the terminal device. The memory may also be used to temporarily store data that has been output or is to be output.
It will be clear to those skilled in the art that, for convenience and brevity of description, specific working procedures of the above-described systems, apparatuses and units may refer to corresponding procedures in the foregoing method embodiments, which are not repeated herein.
In the several embodiments provided in this application, it should be understood that the disclosed systems, apparatuses, and methods may be implemented in other ways. For example, the apparatus embodiments described above are merely illustrative, e.g., the division of the units is merely a logical function division, and there may be additional divisions when actually implemented, e.g., multiple units or components may be combined or integrated into another system, or some features may be omitted or not performed. Alternatively, the coupling or direct coupling or communication connection shown or discussed with each other may be an indirect coupling or communication connection via some interfaces, devices or units, which may be in electrical, mechanical or other form.
The units described as separate units may or may not be physically separate, and units shown as units may or may not be physical units, may be located in one place, or may be distributed on a plurality of network units. Some or all of the units may be selected according to actual needs to achieve the purpose of the solution of this embodiment.
In addition, each functional unit in the embodiments of the present invention may be integrated in one processing unit, or each unit may exist alone physically, or two or more units may be integrated in one unit. The integrated units may be implemented in hardware or in software functional units.
The integrated units, if implemented in the form of software functional units and sold or used as stand-alone products, may be stored in a computer readable storage medium. Based on such understanding, the technical solution of the present invention may be embodied essentially or in part or all of the technical solution or in part in the form of a software product stored in a storage medium, including instructions for causing a computer device (which may be a personal computer, a server, or a network device, etc.) to perform all or part of the steps of the method according to the embodiments of the present invention. And the aforementioned storage medium includes: a U-disk, a removable hard disk, a Read-Only Memory (ROM), a random access Memory (RAM, random Access Memory), a magnetic disk, or an optical disk, or other various media capable of storing program codes.
The above embodiments are only for illustrating the technical solution of the present invention, and not for limiting the same; although the invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical scheme described in the foregoing embodiments can be modified or some technical features thereof can be replaced by equivalents; such modifications and substitutions do not depart from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims (8)

1. The method for sensing and positioning the subsynchronous oscillation source of the offshore wind farm is characterized by comprising the following steps of:
acquiring voltage data and current data of an element to be positioned, wherein active oscillation of offshore wind power occurs;
sequentially performing band-stop filtering and band-pass filtering on the voltage data and the current data to obtain a voltage subsynchronous component, a current subsynchronous component, a voltage supersynchronous component and a current supersynchronous component;
if the current subsynchronous component and the current supersynchronous component meet oscillation occurrence conditions, calculating according to the voltage subsynchronous component, the current subsynchronous component, the voltage supersynchronous component and the current supersynchronous component to obtain instantaneous subsynchronous active power and instantaneous supersynchronous active power;
adding the instantaneous subsynchronous active power and the instantaneous supersynchronous active power to obtain an active power sum; if the active power sum is smaller than a power threshold, the element to be positioned generates active oscillation in a secondary/super-synchronous frequency range;
wherein, calculating instantaneous subsynchronous active power
Figure FDA0004124076350000011
The formula of (2) is +.>
Figure FDA0004124076350000012
Calculating instantaneous supersynchronous active power +.>
Figure FDA0004124076350000013
The formula of (2) is +.>
Figure FDA0004124076350000014
In (1) the->
Figure FDA0004124076350000015
Voltage subsynchronous components of three phases a, b, c, respectively,/->
Figure FDA0004124076350000016
Current subsynchronous components of a, b, c phases respectively,/->
Figure FDA0004124076350000017
A, b, c, respectively, are the voltage supersynchronous components of the three phases a, b, c,/->
Figure FDA0004124076350000018
Figure FDA0004124076350000019
Current supersynchronous components of a, b and c phases respectively;
acquiring voltage and current data of the element to be positioned again as correction data, analyzing the correction data by adopting Fourier analysis to obtain phasor active power of the element to be positioned, and if the phasor active power is smaller than a power threshold value, completing correction of active oscillation of the element to be positioned in a secondary/super-synchronous frequency range;
the correction data is analyzed by adopting Fourier analysis, and the step of obtaining the phasor active power of the element to be positioned comprises the following steps:
analyzing the correction data by adopting Fourier analysis to obtain voltage amplitude, current amplitude, voltage phase angle and current phase angle corresponding to the correction data;
calculating according to the voltage amplitude, the current amplitude, the voltage phase angle and the current phase angle to obtain phasor active power of the element to be positioned;
calculating phasor active power P of element to be positioned ik The formula of (2) is: p (P) ik ＝U ik I ik cos(θ Uik -θ Iik )，θ Uik For the voltage phase angle, θ, of the element k to be positioned in the i oscillation mode Iik For the current phase angle of the element k to be positioned in the i oscillation mode, U ik For the voltage amplitude of the element k to be positioned in the I oscillation mode, I ik For the current amplitude of the element k to be positioned in the i oscillation mode.
2. The method for sensing and positioning a subsynchronous oscillation source of an offshore wind farm according to claim 1, comprising: if the active power sum is not less than the power threshold, the element to be positioned does not undergo active oscillation in the secondary/super-synchronous frequency range.
3. The offshore wind farm subsynchronous oscillation source sensing and positioning method according to claim 1, wherein the fact that the current subsynchronous component and the current subsynchronous component both meet an oscillation occurrence condition means that the magnitudes of the current subsynchronous component and the current subsynchronous component are set between a rated current amplitude lower limit value and a rated current amplitude upper limit value;
the rated current amplitude lower limit value and the rated current amplitude upper limit value are respectively the minimum rated current and the maximum rated current allowed to pass through the element to be positioned of the offshore wind power under the rated working condition.
4. The method for sensing and positioning a subsynchronous oscillation source of an offshore wind farm according to claim 1, wherein the power threshold is 0.
5. The method for sensing and positioning a subsynchronous oscillation source of an offshore wind farm according to claim 1, wherein the step of sequentially performing band-stop filtering and band-pass filtering on the voltage data and the current data to obtain a subsynchronous voltage component, a subsynchronous current component, a subsynchronous voltage component and a supersynchronous current component comprises:
filtering the power frequency components from the voltage data and the current data by using a band-stop filter to obtain corresponding first filtering components and second filtering components;
and filtering the first filtering component and the second filtering component according to the subsynchronous frequency range and the supersynchronous frequency range by adopting two parallel bandpass filters to obtain a voltage subsynchronous component, a current subsynchronous component, a voltage supersynchronous component and a current supersynchronous component.
6. The method for sensing and positioning a subsynchronous oscillation source of an offshore wind farm according to claim 5, wherein the subsynchronous frequency ranges from 3Hz to 47Hz, and the subsynchronous frequency ranges from 53Hz to 97Hz.
7. The device for sensing and positioning the subsynchronous oscillation source of the offshore wind farm is characterized by comprising a data acquisition module, a filtering processing module, a power calculation module and an identification positioning module;
the data acquisition module is used for acquiring voltage data and current data of the element to be positioned, wherein the element to be positioned is subjected to active oscillation of offshore wind power;
the filtering processing module is used for sequentially carrying out band-stop filtering and band-pass filtering processing on the voltage data and the current data to obtain a voltage subsynchronous component, a current subsynchronous component, a voltage supersynchronous component and a current supersynchronous component;
the power calculation module is used for obtaining instantaneous subsynchronous active power and instantaneous oversynchronous active power according to the fact that the current subsynchronous component and the current oversynchronous component meet oscillation occurrence conditions and according to the voltage subsynchronous component, the current subsynchronous component, the voltage oversynchronous component and the current oversynchronous component;
the identification positioning module is used for adding the instantaneous subsynchronous active power and the instantaneous supersynchronous active power to obtain an active power sum; according to the fact that the sum of the active power is smaller than a power threshold value, active oscillation of the element to be positioned in a secondary/super synchronous frequency range is obtained;
wherein, calculating instantaneous subsynchronous active power
Figure FDA0004124076350000031
The formula of (2) is +.>
Figure FDA0004124076350000032
Calculating instantaneous supersynchronous active power +.>
Figure FDA0004124076350000033
The formula of (2) is +.>
Figure FDA0004124076350000034
In (1) the->
Figure FDA0004124076350000035
Voltage subsynchronous components of three phases a, b, c, respectively,/->
Figure FDA0004124076350000036
Current subsynchronous components of a, b, c phases respectively,/->
Figure FDA0004124076350000037
A, b and c three phases respectivelyVoltage supersynchronous component, < >>
Figure FDA0004124076350000038
Figure FDA0004124076350000039
Current supersynchronous components of a, b and c phases respectively;
the identification positioning module is also used for acquiring voltage and current data of the element to be positioned again as correction data, analyzing the correction data by adopting Fourier analysis to obtain phasor active power of the element to be positioned, and if the phasor active power is smaller than a power threshold value, completing correction of active oscillation of the element to be positioned in a secondary/super synchronous frequency range;
the correction data is analyzed by adopting Fourier analysis, and the step of obtaining the phasor active power of the element to be positioned comprises the following steps:
analyzing the correction data by adopting Fourier analysis to obtain voltage amplitude, current amplitude, voltage phase angle and current phase angle corresponding to the correction data;
calculating according to the voltage amplitude, the current amplitude, the voltage phase angle and the current phase angle to obtain phasor active power of the element to be positioned;
calculating phasor active power P of element to be positioned ik The formula of (2) is: p (P) ik ＝U ik I ik cos(θ Uik -θ Iik )，θ Uik For the voltage phase angle, θ, of the element k to be positioned in the i oscillation mode Iik For the current phase angle of the element k to be positioned in the i oscillation mode, U ik For the voltage amplitude of the element k to be positioned in the I oscillation mode, I ik For the current amplitude of the element k to be positioned in the i oscillation mode.
8. The offshore wind farm subsynchronous oscillation source sensing and positioning equipment is characterized by comprising a processor and a memory;
the memory is used for storing program codes and transmitting the program codes to the processor;
the processor is configured to execute the offshore wind farm subsynchronous oscillation source sensing and positioning method according to the instructions in the program code, as set forth in any one of claims 1-6.
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