CN105119286B - Subsynchronous oscillation source location method and apparatus - Google Patents
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Abstract
The invention discloses a subsynchronous oscillation source location method and apparatus. The method comprises the following steps: when subsynchronouos oscillation of a regional power grid is detected, carrying out signal processing for a connection wire between the regional power grid and a main network as well as various power supply wires in the regional power grid, filtering components of interharmonics voltage and current on the connection wire between the regional power grid and the main network, calculating interharmonics impedance, filtering fluctuating power in each circuit power, judging whether an oscillation source exists in the regional power grid or not according to the interharmonics impedance of the connection wire between the regional power grid and the main network, and if the oscillation source exists, determining a specific oscillation source according to the coherence of a variation track of the fluctuating power of each power supply wire in the regional power grid and a variation track of the fluctuating power of the connection wire. The oscillation source in the regional power grid can be located by only acquiring the local information of a load-center substation without depending on the wide area information of different transformation substations and a communication network, and the construction of practical engineering is facilitated.
Description
Technical Field
The invention relates to the field of power control, in particular to a method and a device for positioning a subsynchronous oscillation source.
Background
With the rapid increase of economy and the rapid development of high-energy-consumption industries, the requirements on renewable new energy sources are more and more urgent. In recent years, with the increasing maturity of wind power and photovoltaic power generation technologies, the power generation cost is gradually reduced, large-scale commercial operation of wind power and photovoltaic becomes possible, and by 2020, the installed ratio of non-fossil energy to fossil energy power generation in China is about 4:6, the installed ratio of wind power to solar energy power generation reaches about 3 hundred million kilowatts, and about 1.8 hundred million kilowatts are newly added; the large-scale wind power and solar energy development areas in China are generally positioned at the tail ends of power grids, the loads of the power grids are mostly positioned in east and middle areas which are developed economically, extra-high voltage high-capacity power transmission technology or super/extra-high voltage alternating current power transmission with series compensation capacitors is often adopted to enable western electric energy to be efficiently and remotely transmitted to load centers in the middle and east, the power grids can generate subsynchronous oscillation under the action of various factors such as wind power generator inverters, SVCs, SVGs, direct current power transmission and series compensation capacitors, the phenomenon of excessive subsynchronous oscillation of large-scale wind power bases which are put into operation in China at present occurs, and the safe and stable operation of the power grids and the safety of thermal power units in the areas are seriously influenced. If the oscillation source can be positioned on line in real time when the sub-synchronous oscillation occurs in the power grid, a solid foundation can be laid for analyzing the reason causing the sub-synchronous oscillation and adopting further control measures, and most of the existing sub-synchronous oscillation analysis methods are off-line analysis based on PMU recorded broadcast data after an accident or only detect whether the sub-synchronous oscillation occurs in a certain area, and the specific power line is not determined on line as the oscillation source.
Disclosure of Invention
In view of the above, embodiments of the present invention provide a method and an apparatus for positioning a sub-synchronous oscillation source to solve the problems in the prior art.
In order to achieve the above purpose, the technical solution of the embodiment of the present invention is realized as follows: a method for locating a subsynchronous oscillation source, the method comprising:
performing subsynchronous oscillation detection according to current and power signals of the regional power grid and the main grid connecting line to obtain a detection result;
when subsynchronous oscillation is detected, signal processing is carried out on the regional power grid, the main network connecting line and each power line in the regional power grid, inter-harmonic voltage and current components on the regional power grid and the main network connecting line are filtered out, inter-harmonic impedance is calculated, and fluctuation power in each line power is filtered out;
judging whether an oscillation source exists in the regional power grid or not according to inter-harmonic impedance of the regional power grid and a main network connecting line to obtain a judgment result;
and when the detection result is that subsynchronous oscillation occurs in the regional power grid and the judgment result is that an oscillation source exists in the regional power grid, determining a specific oscillation source according to the coherence of the fluctuation power variation track of each power line and the fluctuation power variation track of the tie line in the regional power grid.
Further, the method for detecting subsynchronous oscillation comprises the following steps: setting a current fluctuation threshold value, a power fluctuation threshold value and a group of characteristic frequencies, and if any one of the following conditions is met, determining that subsynchronous oscillation occurs as a detection result:
1) when the effective value fluctuation range of the current of the tie line is larger than or equal to the current fluctuation threshold value, and the current fluctuation frequency meets any frequency characteristic in the group of characteristic frequencies;
2) the power fluctuation range of the tie line is larger than or equal to the power fluctuation threshold value, and the power fluctuation frequency meets any frequency characteristic in the group of characteristic frequencies.
Further, when the real part of the inter-harmonic impedance is positive, the judgment result is that the local power grid has the oscillation source.
Further, a specific oscillation source is determined according to the coherence of the fluctuation power variation track of each power line in the regional power grid and the fluctuation power variation track of the tie line, and when any power line meets the following three conditions, the power line is judged to be the oscillation source:
1) the duration of the time of the sign of the power line wave power to the time derivative opposite to that of the tie line wave power to the time derivative in one subsynchronous oscillation period is more than K1× synchronous oscillation cycles, K1Taking 0.75;
2) within a subsynchronous oscillation period, the time interval between the moment when the maximum value of the power line fluctuation power appears and the moment when the minimum value of the tie line fluctuation power appears is less than K2× synchronous oscillation cycles, K2Taking 0.25;
3) within a subsynchronous oscillation period, the time interval between the moment when the minimum value of the power line fluctuation power occurs and the moment when the maximum value of the tie line fluctuation power occurs is less than K3× synchronous oscillation cycles, K3Take 0.25.
Further, the set of characteristic frequencies includes more than 6 characteristic frequencies, and whether the frequency of the subsynchronous oscillation meets a certain characteristic frequency f is judgednIs characterized by two methods:
the method comprises the following steps: subsynchronous oscillation frequency and characteristic frequency fnThe absolute value of the difference is smaller than a set error threshold fixed value, and n is a non-zero natural number;
the second method comprises the following steps: for each characteristic frequency fnRespectively setting a characteristic frequency low range fixed value fnLHigh range constant f of characteristic frequencynH，When the subsynchronous oscillation frequency is greater than fnLAnd is less than fnHThen the characteristic frequency characteristic is considered to be satisfied, and n is taken as a non-zero natural number.
In order to achieve the technical purpose, the invention adopts another technical scheme as follows: subsynchronous oscillation source positioning device, its characterized in that: the device comprises a subsynchronous oscillation detection module, a signal processing module, an oscillation source judgment module and an oscillation source positioning module;
the subsynchronous oscillation detection module is used for detecting whether subsynchronous oscillation occurs in the regional power grid to obtain a detection result;
the signal processing module is used for processing signals of the regional power grid and the main network interconnection line and each power line in the regional power grid, filtering out inter-harmonic voltage and current components on the regional power grid and the main network interconnection line, calculating inter-harmonic impedance, and filtering out fluctuation power in each line power;
the oscillation source judging module is used for judging whether an oscillation source exists in the regional power grid according to inter-harmonic impedance of the regional power grid and the main network connecting line to obtain a judgment result;
and the oscillation source positioning module is used for determining a specific oscillation source according to the coherence of the fluctuation power variation track of each power line in the regional power grid and the fluctuation power variation track of the tie line when the detection result is that the regional power grid generates subsynchronous oscillation and the judgment result is that the oscillation source exists in the regional power grid.
Further, the subsynchronous oscillation detection module sets a current fluctuation threshold, a power fluctuation threshold and a group of characteristic frequencies during subsynchronous oscillation detection, and if any one of the following conditions is met, the detection result is that subsynchronous oscillation occurs:
1) when the effective value fluctuation range of the current of the tie line is larger than or equal to the current fluctuation threshold value, and the current fluctuation frequency meets any frequency characteristic in the set of characteristic frequencies;
2) the power fluctuation range of the tie line is larger than or equal to the power fluctuation threshold value, and the power fluctuation frequency meets any frequency characteristic in the group of characteristic frequencies.
Further, the device also comprises an oscillation source judging module;
and when the real part of the inter-harmonic impedance is positive, the oscillation source judgment module judges that the local power grid has an oscillation source.
Further, the system also comprises an oscillation source positioning module, wherein the oscillation source positioning module determines a specific oscillation source according to the coherence of the fluctuation power variation track of each power line and the fluctuation power variation track of the tie line in the regional power grid, and when any power line meets the following three conditions, the power line is judged to be the oscillation source:
1) the duration of the time of the sign of the power line wave power to the time derivative opposite to that of the tie line wave power to the time derivative in one subsynchronous oscillation period is more than K1× synchronous oscillation cycles, K1Taking 0.75;
2) within a subsynchronous oscillation period, the time interval between the moment when the maximum value of the power line fluctuation power appears and the moment when the minimum value of the tie line fluctuation power appears is less than K2× synchronous oscillation cycles, K2Taking 0.25;
3) within a subsynchronous oscillation period, the time interval between the moment when the minimum value of the power line fluctuation power occurs and the moment when the maximum value of the tie line fluctuation power occurs is less than K3× synchronous oscillation cycles, K3Take 0.25.
The method and the device for positioning the sub-synchronous oscillation source can monitor the junction transformer substation of the wind power base, the main network connecting line and the power supply incoming line from each wind power collecting station to the junction transformer substation at the same time, or monitor the junction transformer substation of a certain energy base, the main network connecting line and the power supply incoming line from each power plant to the junction transformer substation, judge whether an oscillation source exists in the power grid of the area in real time on line when the power grid is subjected to sub-synchronous oscillation, and position a specific wind power collecting station or power plant as the oscillation source if the oscillation source exists in the power grid of the area, so that a solid foundation is laid for analyzing the reason causing the sub-synchronous oscillation and adopting further control measures. The invention can position the oscillation source in the local area power grid only by acquiring the local information of the hub transformer substation, does not depend on the wide area information and the communication network of different transformer substations, and is convenient for the practical engineering implementation.
Drawings
Fig. 1 is a schematic diagram of a first implementation flow of a sub-synchronous oscillation source positioning method according to an embodiment of the present invention;
FIG. 2 is a schematic diagram of a wind power base hub substation connected to a system via a single line;
FIG. 3 is a schematic diagram of a second implementation flow of the method for positioning a sub-synchronous oscillation source according to the embodiment of the present invention;
FIG. 4 is a schematic diagram of a wind power base hub substation connected to a system via a double circuit;
fig. 5 is a schematic structural diagram of a positioning device of a sub-synchronous oscillation source according to an embodiment of the present invention.
Detailed Description
The present invention will be described in further detail with reference to the accompanying drawings and specific embodiments.
Example 1
Fig. 1 is a schematic view of a first implementation flow of the present-time synchronous oscillation source positioning method, as shown in fig. 1, the present-time synchronous oscillation source positioning method includes:
step S101: the method comprises the following steps of performing subsynchronous oscillation detection according to current and power signals of a regional power grid and a main grid connecting line to obtain a detection result, and specifically comprises the following steps: setting a current fluctuation threshold value, a power fluctuation threshold value and a group of characteristic frequencies, and if any one of the following conditions is met, determining that subsynchronous oscillation occurs as a detection result:
1) when the effective value fluctuation range of the current of the tie line is larger than or equal to the current fluctuation threshold value, and the current fluctuation frequency meets any frequency characteristic in the set of characteristic frequencies;
2) the power fluctuation range of the tie line is larger than or equal to the power fluctuation threshold value, and the power fluctuation frequency meets any frequency characteristic in the set of characteristic frequencies.
The characteristic frequency group generally comprises more than 6 characteristic frequencies, and whether the frequency of the subsynchronous oscillation meets a certain characteristic frequency f or not is judgednThere are generally two methods of characterization:
the method comprises the following steps: subsynchronous oscillation frequency and characteristic frequency fnThe absolute value of the difference is smaller than a set error threshold fixed value, and n is a non-zero natural number;
the second method comprises the following steps: for each characteristic frequency fnRespectively setting a characteristic frequency low range fixed value fnLHigh range constant f of characteristic frequencynH，When the subsynchronous oscillation frequency is greater than fnLAnd is less than fnHThen the characteristic frequency characteristic is considered to be satisfied, and n is taken as a non-zero natural number.
When subsynchronous oscillation is detected, under the condition that a wind power base shown in fig. 2 is networked with a main network through a single line, signal processing is carried out on a connecting line and power lines from wind power 1 to wind power 7, inter-harmonic voltage and current components on the connecting line are filtered out, inter-harmonic impedance is calculated, and fluctuation power in the power lines from the connecting line and the wind power 1 to the wind power 7 is filtered out.
Step S102: judging whether an oscillation source exists in the regional power grid or not according to inter-harmonic impedance of the regional power grid and a main network connecting line to obtain a judgment result;
specifically, when the real part of the inter-harmonic impedance is positive, the judgment result is that the local area power grid has an oscillation source.
Step S103: and determining a specific oscillation source according to the coherence of the fluctuation power variation track of each power line in the regional power grid and the fluctuation power variation track of the tie line if the detection result is that the regional power grid has subsynchronous oscillation and the judgment result is that the oscillation source exists in the regional power grid.
Specifically, under the condition that a wind power base is networked with a main network through a single line as shown in fig. 2, a specific oscillation source is determined according to the coherence of the power line fluctuation power variation locus from wind power 1 to wind power 7 and the tie line fluctuation power variation locus, and when the power line of any wind power plant meets the following three conditions, the power line is judged to be the oscillation source:
1) the duration of the time of the sign of the power line wave power to the time derivative opposite to that of the tie line wave power to the time derivative in one subsynchronous oscillation period is more than K1× synchronous oscillation cycles, K1Generally taking 0.75;
2) within a subsynchronous oscillation period, the time interval between the moment when the maximum value of the power line fluctuation power appears and the moment when the minimum value of the tie line fluctuation power appears is less than K2× synchronous oscillation cycles, K2Generally taking 0.25;
3) within a subsynchronous oscillation period, the time interval between the moment when the minimum value of the power line fluctuation power occurs and the moment when the maximum value of the tie line fluctuation power occurs is less than K3× synchronous oscillation cycles, K3Typically 0.25.
Assuming that the power supply incoming line of the wind power 6 in a certain oscillation meets the above characteristics, the wind power 6 is judged to be a subsynchronous oscillation source.
According to the subsynchronous oscillation source positioning method, when the subsynchronous oscillation of the regional power grid is detected, whether an oscillation source exists in the regional power grid or not is judged on line in real time, if the oscillation source exists in the regional power grid, the specific wind power station collection station is positioned as the oscillation source, a solid foundation is laid for analyzing the reason causing the subsynchronous oscillation and adopting further control measures, the oscillation source in the regional power grid can be positioned only by collecting the local information of the junction substation, the wide area information and the communication network of different substations are not relied on, and the practical engineering implementation is facilitated.
In the embodiment of the invention, when detecting that the sub-synchronous oscillation occurs in the regional power grid, signal processing is performed on the regional power grid, the main network interconnection line and each power line in the regional power grid, inter-harmonic voltage and current components on the regional power grid and the main network interconnection line are filtered out, inter-harmonic impedance is calculated, fluctuation power in each line power is filtered out, whether an oscillation source exists in the regional power grid is judged according to the inter-harmonic impedance of the regional power grid and the main network interconnection line, and if the oscillation source exists, a specific oscillation source is determined according to the coherence of fluctuation power variation tracks of each power line and fluctuation power variation tracks of the interconnection lines in the regional power grid.
Example 2
Fig. 3 is a schematic view of a second implementation flow of the present synchronous oscillation source positioning method, and as shown in fig. 3, the present synchronous oscillation source positioning method includes:
step S201: inputting analog quantities of each tie line of the regional power grid and the main grid for synchronous sampling, and combining the analog quantities of each branch line subjected to synchronous sampling to obtain total current and total power of the tie lines;
specifically, as shown in fig. 4, the wind power base hub substation is connected to the system through a double-circuit line, voltage and current signals of a tie line 1 and a tie line 2 are sampled synchronously, total current and total power flowing to a main network of a regional power grid are obtained through combination, the total current and the total power are used as a tie line total current and a total power signal for subsequent judgment, and the tie line after signal combination is regarded as a total tie line.
Step S202: performing subsynchronous oscillation detection according to total current and total power signals of the regional power grid and the main grid connecting line to obtain a detection result, wherein the specific method comprises the following steps: setting a current fluctuation threshold value, a power fluctuation threshold value and a group of characteristic frequencies, and if any one of the following conditions is met, determining that subsynchronous oscillation occurs as a detection result:
1) when the effective value fluctuation range of the total current of the tie line is larger than or equal to the current fluctuation threshold value, and the total current fluctuation frequency meets any frequency characteristic in the set of characteristic frequencies;
2) the total power fluctuation range of the tie line is larger than or equal to the power fluctuation threshold value, and the total power fluctuation frequency meets any frequency characteristic in the set of characteristic frequencies.
The characteristic frequency group generally comprises more than 6 characteristic frequencies, and whether the frequency of the subsynchronous oscillation meets a certain characteristic frequency f or not is judgednThere are generally two methods of characterization:
the method comprises the following steps: subsynchronous oscillation frequency and characteristic frequency fnThe absolute value of the difference is smaller than a set error threshold fixed value, and n is a non-zero natural number;
the second method comprises the following steps: for each characteristic frequency fnRespectively setting a characteristic frequency low range fixed value fnLHigh range constant f of characteristic frequencynH，When the subsynchronous oscillation frequency is greater than fnLAnd is less than fnHThen the characteristic frequency characteristic is considered to be satisfied, and n is taken as a non-zero natural number.
When subsynchronous oscillation is detected, under the condition that a wind power base shown in fig. 4 is networked with a main network through double lines, signal processing is carried out on a connecting line and power lines from wind power 1 to wind power 7, inter-harmonic voltage and current components on a main connecting line are filtered out, inter-harmonic impedance is calculated, and fluctuation power in the power lines from the main connecting line and the wind power 1 to the wind power 7 is filtered out.
Step S203: judging whether an oscillation source exists in the regional power grid or not according to inter-harmonic impedance of the regional power grid and a main network main connecting line to obtain a judgment result;
specifically, when the real part of the inter-harmonic impedance is positive, the judgment result is that the local area power grid has an oscillation source.
Step S204: and determining a specific oscillation source according to the coherence of the fluctuation power variation track of each power line and the fluctuation power variation track of the total tie line in the regional power grid if the detection result is that the regional power grid generates subsynchronous oscillation and the judgment result is that the oscillation source exists in the regional power grid.
Specifically, in the case that the wind power base is networked with the main network through two lines as shown in fig. 4, a specific oscillation source is determined according to the coherence between the power line fluctuation power variation locus of the wind power 1 to the wind power 7 and the total link fluctuation power variation locus, and when the power line of any wind farm meets the following three conditions, the power line is determined to be the oscillation source:
1) the duration of the time of the sign of the power line wave power to the time derivative opposite to the sign of the total tie line wave power to the time derivative in one subsynchronous oscillation period is more than K1× synchronous oscillation cycles, K1Generally taking 0.75;
2) within a subsynchronous oscillation period, the time interval between the moment when the maximum value of the power line fluctuation power appears and the moment when the minimum value of the total tie line fluctuation power appears is less than K2× synchronous oscillation cycles, K2Generally taking 0.25;
3) within a subsynchronous oscillation period, the time interval between the moment when the minimum value of the power line fluctuation power occurs and the moment when the maximum value of the total tie line fluctuation power occurs is less than K3× synchronous oscillation cycles, K3Typically 0.25.
Assuming that the power supply incoming line of the wind power 6 in a certain oscillation meets the above characteristics, the wind power 6 is judged to be a subsynchronous oscillation source.
According to the subsynchronous oscillation source positioning method, when the subsynchronous oscillation of the regional power grid is detected, whether an oscillation source exists in the regional power grid or not is judged on line in real time, if the oscillation source exists in the regional power grid, the specific wind power station collection station is positioned as the oscillation source, a solid foundation is laid for analyzing the reason causing the subsynchronous oscillation and adopting further control measures, the oscillation source in the regional power grid can be positioned only by collecting the local information of the junction substation, the wide area information and the communication network of different substations are not relied on, and the practical engineering implementation is facilitated.
Example 3
Fig. 5 is a schematic diagram of a structure of a present-time synchronous oscillation source positioning apparatus, as shown in fig. 5, the apparatus includes a sub-synchronous oscillation detection module 301, a signal processing module 302, an oscillation source determination module 303, and an oscillation source positioning module 304; wherein,
the subsynchronous oscillation detection module 301 is configured to detect whether subsynchronous oscillation occurs in the regional power grid, so as to obtain a detection result;
the signal processing module 302 is configured to perform signal processing on the regional power grid, the main grid interconnection line and each power line in the regional power grid, filter out inter-harmonic voltage and current components on the regional power grid and the main grid interconnection line, calculate inter-harmonic impedance, and filter out fluctuating power in each line power;
the oscillation source judgment module 303 is configured to judge whether an oscillation source exists in the local area power grid according to inter-harmonic impedance of the local area power grid and the main network connecting line, so as to obtain a judgment result;
and the oscillation source positioning module 304, when the detection result is that sub-synchronous oscillation occurs in the regional power grid, and the judgment result is that an oscillation source exists in the regional power grid, determines a specific oscillation source according to the coherence of the fluctuation power variation trajectory of each power line in the regional power grid and the fluctuation power variation trajectory of the tie line.
In practical application, each module in the subsynchronous oscillation source positioning device and each unit included in each module provided in the embodiment of the present invention may be implemented by a processor in the device, or may be implemented by a specific logic circuit; for example, in practical applications, the device may be implemented by a Central Processing Unit (CPU), a Microprocessor (MPU), a Digital Signal Processor (DSP), or a Field Programmable Gate Array (FPGA) located in the device.
The above description is only for the specific embodiments of the present invention, but the scope of the present invention is not limited thereto, and any person skilled in the art can easily conceive of the changes or substitutions within the technical scope of the present invention, and all the changes or substitutions should be covered within the scope of the present invention.
Claims (7)
1. A method for locating a subsynchronous oscillation source, the method comprising:
performing subsynchronous oscillation detection according to current and power signals of the regional power grid and the main grid connecting line to obtain a detection result;
the method for detecting the subsynchronous oscillation comprises the following steps: setting a current fluctuation threshold value, a power fluctuation threshold value and a group of characteristic frequencies, and if any one of the following conditions is met, determining that subsynchronous oscillation occurs as a detection result:
1) when the effective value fluctuation range of the current of the tie line is larger than or equal to the current fluctuation threshold value, and the current fluctuation frequency meets any frequency characteristic in the group of characteristic frequencies;
2) the power fluctuation range of the tie line is larger than or equal to a power fluctuation threshold value, and the power fluctuation frequency meets any frequency characteristic in the group of characteristic frequencies;
the group of characteristic frequencies comprises more than 6 characteristic frequencies, and whether the frequency of the subsynchronous oscillation meets a certain characteristic frequency f or not is judgednIs characterized by two methods:
the method comprises the following steps: subsynchronous oscillation frequency and characteristic frequency fnThe absolute value of the difference is smaller than a set error threshold fixed value, and n is a non-zero natural number;
the second method comprises the following steps: for each characteristic frequency fnRespectively setting a characteristic frequency low range fixed value fnLHigh range constant f of characteristic frequencynH，When the subsynchronous oscillation frequency is greater than fnLAnd is less than fnHConsidering that the characteristic frequency characteristic is met, and taking a non-zero natural number as n;
when subsynchronous oscillation is detected, signal processing is carried out on the regional power grid, the main network connecting line and each power line in the regional power grid, inter-harmonic voltage and current components on the regional power grid and the main network connecting line are filtered out, inter-harmonic impedance is calculated, and fluctuation power in each line power is filtered out;
judging whether an oscillation source exists in the regional power grid or not according to inter-harmonic impedance of the regional power grid and a main network connecting line to obtain a judgment result;
and when the detection result is that subsynchronous oscillation occurs in the regional power grid and the judgment result is that an oscillation source exists in the regional power grid, determining a specific oscillation source according to the coherence of the fluctuation power variation track of each power line and the fluctuation power variation track of the tie line in the regional power grid.
2. The method of claim 1, wherein: and when the real part of the inter-harmonic impedance is positive, judging that the local power grid has an oscillation source.
3. The method of claim 1, wherein: determining a specific oscillation source according to the coherence of the fluctuation power change track of each power line and the fluctuation power change track of the tie line in the regional power grid, and judging that any power line is the oscillation source when the power line meets the following three conditions:
1) the duration of the time of the sign of the power line wave power to the time derivative opposite to that of the tie line wave power to the time derivative in one subsynchronous oscillation period is more than K1× synchronous oscillation cycles, K1Taking 0.75;
2) within a subsynchronous oscillation period, the time interval between the moment when the maximum value of the power line fluctuation power appears and the moment when the minimum value of the tie line fluctuation power appears is less than K2× synchronous oscillation cycles, K2Taking 0.25;
3) within a subsynchronous oscillation period, the time interval between the moment when the minimum value of the power line fluctuation power occurs and the moment when the maximum value of the tie line fluctuation power occurs is less than K3× synchronous oscillation cycles, K3Take 0.25.
4. A subsynchronous oscillation source positioning device is characterized in that: the device comprises a subsynchronous oscillation detection module, a signal processing module, an oscillation source judgment module and an oscillation source positioning module;
the subsynchronous oscillation detection module is used for detecting whether subsynchronous oscillation occurs in the regional power grid to obtain a detection result;
the method for detecting the subsynchronous oscillation comprises the following steps: setting a current fluctuation threshold value, a power fluctuation threshold value and a group of characteristic frequencies, and if any one of the following conditions is met, determining that subsynchronous oscillation occurs as a detection result:
1) when the effective value fluctuation range of the current of the tie line is larger than or equal to the current fluctuation threshold value, and the current fluctuation frequency meets any frequency characteristic in the group of characteristic frequencies;
2) the power fluctuation range of the tie line is larger than or equal to a power fluctuation threshold value, and the power fluctuation frequency meets any frequency characteristic in the group of characteristic frequencies;
the set of characteristic frequencies includesMore than 6 characteristic frequencies, and judging whether the frequency of the subsynchronous oscillation meets a certain characteristic frequency fnIs characterized by two methods:
the method comprises the following steps: subsynchronous oscillation frequency and characteristic frequency fnThe absolute value of the difference is smaller than a set error threshold fixed value, and n is a non-zero natural number;
the second method comprises the following steps: for each characteristic frequency fnRespectively setting a characteristic frequency low range fixed value fnLHigh range constant f of characteristic frequencynH，When the subsynchronous oscillation frequency is greater than fnLAnd is less than fnHConsidering that the characteristic frequency characteristic is met, and taking a non-zero natural number as n;
the signal processing module is used for processing signals of the regional power grid and the main network interconnection line and each power line in the regional power grid, filtering out inter-harmonic voltage and current components on the regional power grid and the main network interconnection line, calculating inter-harmonic impedance, and filtering out fluctuation power in each line power;
the oscillation source judging module is used for judging whether an oscillation source exists in the regional power grid according to inter-harmonic impedance of the regional power grid and the main network connecting line to obtain a judgment result;
and the oscillation source positioning module is used for determining a specific oscillation source according to the coherence of the fluctuation power variation track of each power line in the regional power grid and the fluctuation power variation track of the tie line when the detection result is that the regional power grid generates subsynchronous oscillation and the judgment result is that the oscillation source exists in the regional power grid.
5. The apparatus of claim 4, wherein: the subsynchronous oscillation detection module sets a current fluctuation threshold value, a power fluctuation threshold value and a group of characteristic frequencies during subsynchronous oscillation detection, and the detection result is that subsynchronous oscillation occurs when any one of the following conditions is met:
1) when the effective value fluctuation range of the current of the tie line is larger than or equal to the current fluctuation threshold value, and the current fluctuation frequency meets any frequency characteristic in the group of characteristic frequencies;
2) the power fluctuation range of the tie line is larger than or equal to the power fluctuation threshold value, and the power fluctuation frequency meets any frequency characteristic in the group of characteristic frequencies.
6. The apparatus of claim 5, wherein: the device also comprises an oscillation source judging module;
and when the real part of the inter-harmonic impedance is positive, the oscillation source judgment module judges that the local power grid has an oscillation source.
7. The apparatus of claim 6, wherein: the system also comprises an oscillation source positioning module, wherein the oscillation source positioning module determines a specific oscillation source according to the coherence of the fluctuation power change track of each power line and the fluctuation power change track of the tie line in the regional power grid, and when any power line meets the following three conditions, the power line is judged to be the oscillation source:
1) the duration of the time of the sign of the power line wave power to the time derivative opposite to that of the tie line wave power to the time derivative in one subsynchronous oscillation period is more than K1× synchronous oscillation cycles, K1Taking 0.75;
2) within a subsynchronous oscillation period, the time interval between the moment when the maximum value of the power line fluctuation power appears and the moment when the minimum value of the tie line fluctuation power appears is less than K2× synchronous oscillation cycles, K2Taking 0.25;
3) and in a subsynchronous oscillation period, the time interval between the moment when the minimum value of the power line fluctuation power occurs and the moment when the maximum value of the tie line fluctuation power occurs is less than K3 times of the subsynchronous oscillation period, and K3 is 0.25.
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| CN105891625B (en) * | 2016-01-26 | 2018-10-30 | 清华大学 | Subsynchronous oscillation of electrical power system disturbing source discriminating conduct based on energy stream |
| CN106154111B (en) * | 2016-06-22 | 2018-09-11 | 南京南瑞继保电气有限公司 | A kind of m-Acetyl chlorophosphonazo occurring source localization method and device |
| CN105896541B (en) * | 2016-06-24 | 2018-03-30 | 国网新疆电力公司 | A kind of wind-powered electricity generation collects station m-Acetyl chlorophosphonazo control method |
| CN106383270B (en) * | 2016-08-26 | 2019-01-22 | 清华大学 | Subsynchronous oscillation of electrical power system monitoring method and system based on wide area measurement information |
| CN106571636B (en) * | 2016-10-21 | 2019-11-05 | 国电南瑞科技股份有限公司 | A kind of forced oscillation disturbance source locating method based on frequency-division section parallel computation |
| CN106443365B (en) * | 2016-11-23 | 2019-04-09 | 国网新疆电力公司 | A kind of m-Acetyl chlorophosphonazo occurring source localization method |
| CN109683057B (en) * | 2017-10-18 | 2021-09-21 | 中国电力科学研究院 | Method and system for positioning subsynchronous oscillation online disturbance source of power system |
| DE102018116446A1 (en) * | 2018-07-06 | 2020-01-09 | Wobben Properties Gmbh | Wind energy system and method for detecting low-frequency vibrations in an electrical supply network |
| TWI686615B (en) * | 2018-10-22 | 2020-03-01 | 財團法人工業技術研究院 | Disturbance source positioning method |
| CN113364009B (en) * | 2021-06-22 | 2022-09-09 | 国电南瑞科技股份有限公司 | Wide area monitoring and early warning method for subsynchronous oscillation of power grid containing large-scale new energy |
| CN117013558A (en) * | 2022-04-28 | 2023-11-07 | 北京天诚同创电气有限公司 | Micro-grid control method and device, and power supply control method and device |
| CN114928075B (en) * | 2022-05-23 | 2024-05-07 | 国家电网有限公司华东分部 | Control method of subsynchronous oscillation based on instantaneous active power of power grid line |
| CN115498652B (en) * | 2022-05-30 | 2024-04-30 | 内蒙古电力(集团)有限责任公司内蒙古电力科学研究院分公司 | CPS-based comprehensive energy park electric energy quality control method and system |
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