CN105119286A - Subsynchronous oscillation source location method and apparatus - Google Patents
Subsynchronous oscillation source location method and apparatus Download PDFInfo
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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 present invention relates to Electric control field, particularly relate to a kind of sub-synchronous oscillation source electricity method and device.
Background technology
Along with economy increases fast, high energy-consuming industry develops rapidly, and the requirement for renewable new forms of energy is more and more urgent.Increasingly mature in recent years along with wind-powered electricity generation and photovoltaic power generation technology, its cost of electricity-generating is also progressively reducing, wind-powered electricity generation and the operation of photovoltaic large-scale commercial applications become possibility, to the year two thousand twenty, the non-fossil energy of China and fossil energy generator installation ratio are about 4:6, the installation of wind-powered electricity generation, solar power generation reaches about 300,000,000 kilowatts, newly-increased about 1.8 hundred million kilowatts, China's wind energy and solar energy large-scale development area are generally in electrical network end, and network load is positioned at economically developed eastern region and middle part mostly, efficiently the load center of the central and east can be delivered to by remote conveying for making western electric energy, normal employing ultra high voltage large capacity transmission technology or install the ultra-high/extra-high voltage ac transmission of serial compensation capacitance additional, this kind of electrical network is at wind-driven generator inverter, SVC, SVG, sub-synchronous oscillation may be there is under the effect of the many factors such as direct current transportation and serial compensation capacitance, there is repeatedly sub-synchronous oscillation phenomenon in the large-scale wind power base that China has put into operation at present, the safe and stable operation of electrical network and the safety of this area's fired power generating unit are badly influenced.If oscillation source can be located in real time online when electrical network generation sub-synchronous oscillation, can be analyze cause sub-synchronous oscillation to occur reason and take further control measure to take a firm foundation, and be at present the off-line analysis based on PMU recorded broadcast data after accident mostly to the analytical method of sub-synchronous oscillation, or only detect a certain area and whether sub-synchronous oscillation occurs, can not determine which bar power line concrete is oscillation source online.
Summary of the invention
In view of this, the embodiment of the present invention provides a kind of sub-synchronous oscillation source electricity method and device for solving problems of the prior art.
For achieving the above object, the technical scheme of the embodiment of the present invention is achieved in that sub-synchronous oscillation source electricity method, and it is characterized in that, described method comprises:
Carry out sub-synchronous oscillation detection according to the electric current of regional power grid and major network interconnection, power signal, draw testing result;
When detecting sub-synchronous oscillation, signal transacting is carried out to each power line in regional power grid and major network interconnection and one's respective area electrical network, leach the m-Acetyl chlorophosphonazo voltage on regional power grid and major network interconnection, current component calculate m-Acetyl chlorophosphonazo impedance, leach the fluctuating power in each line power;
M-Acetyl chlorophosphonazo impedance according to regional power grid and major network interconnection judges whether there is oscillation source in the electrical network of one's respective area, draws judged result;
When described testing result is regional power grid generation sub-synchronous oscillation, and described judged result is when there is oscillation source in regional power grid, then determine concrete oscillation source according to the same tone of power line fluctuating power variation track each in regional power grid and interconnection fluctuating power variation track.
Further, the method for carrying out sub-synchronous oscillation detection is: setting current fluctuation threshold value, power fluctuation threshold value and a stack features frequency, and arbitrary condition below meeting then testing result is generation sub-synchronous oscillation:
1) when interconnection current effective value fluctuation range is more than or equal to current fluctuation threshold value, and current fluctuation frequency meets arbitrary frequecy characteristic in a described stack features frequency;
2) interconnection tie power fluctuation scope is more than or equal to power fluctuation threshold value, and power fluctuation frequency meets arbitrary frequecy characteristic in a described stack features frequency.
Further, when the real part of m-Acetyl chlorophosphonazo impedance is just, then judged result is that one's respective area electrical network exists oscillation source.
Further, the same tone according to power line fluctuating power variation track each in regional power grid and interconnection fluctuating power variation track determines concrete oscillation source, and below arbitrary power line meets, three conditions then judge that this power line is oscillation source:
1) within a sub-synchronous oscillation cycle, the duration that power line fluctuating power is contrary with the symbol of interconnection fluctuating power to time-derivative to the symbol of time-derivative is greater than K
1× sub-synchronous oscillation the cycle, K
1get 0.75;
2) within a sub-synchronous oscillation cycle, the time interval between the moment that power line fluctuating power maximum occurs and the moment that interconnection fluctuating power minimum value occurs is less than K
2× sub-synchronous oscillation the cycle, K
2get 0.25;
3) within a sub-synchronous oscillation cycle, the time interval between the moment that power line fluctuating power minimum value occurs and the moment that interconnection fluctuating power maximum occurs is less than K
3× sub-synchronous oscillation the cycle, K
3get 0.25.
Further, a described stack features frequency comprises more than 6 characteristic frequencies, judges whether the frequency of sub-synchronous oscillation meets a certain characteristic frequency f
nfeature has two kinds of methods:
Method one: sub-synchronous oscillation frequency and characteristic frequency f
nthe absolute value of difference be less than the error threshold definite value of setting, n gets non-zero natural number;
Method two: to each characteristic frequency f
na low scope definite value f of characteristic frequency is set respectively
nLwith characteristic frequency high scope definite value f
nH,when sub-synchronous oscillation frequency is greater than f
nLand be less than f
nHthen think and meet this characteristic frequency feature, n gets non-zero natural number.
For realizing above-mentioned technical purpose, the another kind of technical scheme that the present invention takes is: sub-synchronous oscillation source electricity device, is characterized in that: comprise sub-synchronous oscillation detection module, signal processing module, oscillation source judge module and oscillation source locating module;
Described sub-synchronous oscillation detection module is used for surveyed area electrical network and whether sub-synchronous oscillation occurs, and obtains testing result;
Described signal processing module is used for carrying out signal transacting to each power line in regional power grid and major network interconnection and one's respective area electrical network, leach the m-Acetyl chlorophosphonazo voltage and current component on regional power grid and major network interconnection, and calculate m-Acetyl chlorophosphonazo impedance, leach the fluctuating power in each line power;
Described oscillation source judge module is used for judging whether there is oscillation source in the electrical network of one's respective area according to the m-Acetyl chlorophosphonazo impedance of regional power grid and major network interconnection, draws judged result;
Described oscillation source locating module is used for when described testing result is regional power grid generation sub-synchronous oscillation, and described judged result is when there is oscillation source in regional power grid, the same tone according to power line fluctuating power variation track each in regional power grid and interconnection fluctuating power variation track determines concrete oscillation source.
Further, described sub-synchronous oscillation detection module, when places synchronized oscillation detects, setting current fluctuation threshold value, power fluctuation threshold value and a stack features frequency, arbitrary condition below meeting then testing result is that sub-synchronous oscillation occurs:
1) when interconnection current effective value fluctuation range is more than or equal to current fluctuation threshold value, and current fluctuation frequency meets arbitrary frequecy characteristic in described one this stack features frequency;
2) interconnection tie power fluctuation scope is more than or equal to power fluctuation threshold value, and power fluctuation frequency meets arbitrary frequecy characteristic in a described stack features frequency.
Further, described device also comprises oscillation source judge module;
When the real part of m-Acetyl chlorophosphonazo impedance is timing, described oscillation source judge module judged result is that one's respective area electrical network exists oscillation source.
Further, also comprise oscillation source locating module, oscillation source locating module determines concrete oscillation source according to the same tone of power line fluctuating power variation track each in regional power grid and interconnection fluctuating power variation track, and below arbitrary power line meets, three conditions then judge that this power line is oscillation source:
1) within a sub-synchronous oscillation cycle, the duration that power line fluctuating power is contrary with the symbol of interconnection fluctuating power to time-derivative to the symbol of time-derivative is greater than K
1× sub-synchronous oscillation the cycle, K
1get 0.75;
2) within a sub-synchronous oscillation cycle, the time interval between the moment that power line fluctuating power maximum occurs and the moment that interconnection fluctuating power minimum value occurs is less than K
2× sub-synchronous oscillation the cycle, K
2get 0.25;
3) within a sub-synchronous oscillation cycle, the time interval between the moment that power line fluctuating power minimum value occurs and the moment that interconnection fluctuating power maximum occurs is less than K
3× sub-synchronous oscillation the cycle, K
3get 0.25.
Sub-synchronous oscillation source electricity method of the present invention and device, can monitor that wind power base load-center substation and major network interconnection and each wind-powered electricity generation collect the electric power incoming line of this load-center substation of standing simultaneously, or monitor a certain Energy Base load-center substation and major network interconnection and each power plant electric power incoming line to this load-center substation, whether oscillation source is there is in the electrical network of online real-time judge one's respective area when electrical network generation sub-synchronous oscillation, if one's respective area electrical network exists oscillation source, navigate to which wind energy turbine set concrete and collect station or power plant is oscillation source, for analyze cause sub-synchronous oscillation to occur reason and take further control measure to take a firm foundation.The present invention only needs to gather the local information of load-center substation can locate oscillation source in the electrical network of one's respective area, does not rely on different substation Wide-area Measurement Information and communication network, is convenient to Practical Project and implements.
Accompanying drawing explanation
Fig. 1 is the realization flow schematic diagram one of embodiment of the present invention sub-synchronous oscillation source electricity method;
To be wind power base load-center substation to be connected with system schematic diagram by single line Fig. 2;
Fig. 3 is the realization flow schematic diagram two of embodiment of the present invention sub-synchronous oscillation source electricity method;
To be wind power base load-center substation to be connected with system schematic diagram by double loop Fig. 4;
Fig. 5 is the composition structural representation of embodiment of the present invention sub-synchronous oscillation source electricity device.
Embodiment
Below in conjunction with drawings and the specific embodiments, the present invention is further described in more detail.
Embodiment 1
Fig. 1 is the realization flow schematic diagram one of this sub-synchronous oscillation source electricity method, and as shown in Figure 1, this sub-synchronous oscillation source electricity method comprises:
Step S101: carry out sub-synchronous oscillation detection according to the electric current of regional power grid and major network interconnection, power signal, draw testing result, concrete grammar is: setting current fluctuation threshold value, power fluctuation threshold value and a stack features frequency, and arbitrary condition below meeting then testing result is generation sub-synchronous oscillation:
1) when interconnection current effective value fluctuation range is more than or equal to current fluctuation threshold value, and current fluctuation frequency meets arbitrary frequecy characteristic in this stack features frequency described;
2) interconnection tie power fluctuation scope is more than or equal to power fluctuation threshold value, and power fluctuation frequency meets arbitrary frequecy characteristic in this stack features frequency described.
This stack features frequency described generally comprises more than 6 characteristic frequencies, judges whether the frequency of sub-synchronous oscillation meets a certain characteristic frequency f
nfeature has two kinds of methods usually:
Method one: sub-synchronous oscillation frequency and characteristic frequency f
nthe absolute value of difference be less than the error threshold definite value of setting, n gets non-zero natural number;
Method two: to each characteristic frequency f
na low scope definite value f of characteristic frequency is set respectively
nLwith characteristic frequency high scope definite value f
nH,when sub-synchronous oscillation frequency is greater than f
nLand be less than f
nHthen think and meet this characteristic frequency feature, n gets non-zero natural number.
When detecting sub-synchronous oscillation, in the situation of wind power base as shown in Figure 2 by single line and Major Networks, to the power line of wind-powered electricity generation 7, signal transacting is carried out to interconnection and wind-powered electricity generation 1, leach the m-Acetyl chlorophosphonazo voltage on interconnection, current component calculate m-Acetyl chlorophosphonazo impedance, leach interconnection and wind-powered electricity generation 1 to the fluctuating power in the power line power of wind-powered electricity generation 7.
Step S102: the m-Acetyl chlorophosphonazo impedance according to regional power grid and major network interconnection judges whether there is oscillation source in the electrical network of one's respective area, draws judged result;
Particularly, when the real part of m-Acetyl chlorophosphonazo impedance is just, then judged result is that one's respective area electrical network exists oscillation source.
Step S103: described testing result is regional power grid generation sub-synchronous oscillation, and described judged result is there is oscillation source in regional power grid, then determine concrete oscillation source according to the same tone of power line fluctuating power variation track each in regional power grid and interconnection fluctuating power variation track.
Particularly, in the situation of wind power base as shown in Figure 2 by single line and Major Networks, then determine concrete oscillation source according to wind-powered electricity generation 1 to the power line fluctuating power variation track of wind-powered electricity generation 7 and the same tone of interconnection fluctuating power variation track, below the power line of arbitrary wind energy turbine set meets, three conditions then judge that this power line is oscillation source:
1) within a sub-synchronous oscillation cycle, the duration that power line fluctuating power is contrary with the symbol of interconnection fluctuating power to time-derivative to the symbol of time-derivative is greater than K
1× sub-synchronous oscillation the cycle, K
1generally get 0.75;
2) within a sub-synchronous oscillation cycle, the time interval between the moment that power line fluctuating power maximum occurs and the moment that interconnection fluctuating power minimum value occurs is less than K
2× sub-synchronous oscillation the cycle, K
2generally get 0.25;
3) within a sub-synchronous oscillation cycle, the time interval between the moment that power line fluctuating power minimum value occurs and the moment that interconnection fluctuating power maximum occurs is less than K
3× sub-synchronous oscillation the cycle, K
3generally get 0.25.
Suppose that the electric power incoming line of wind-powered electricity generation 6 in certain vibration meets above-mentioned feature, then judge that wind-powered electricity generation 6 is as sub-synchronous oscillation source.
By sub-synchronous oscillation source electricity method described in the embodiment of the present invention, when regional power grid generation sub-synchronous oscillation being detected, whether oscillation source is there is in the electrical network of online real-time judge one's respective area, if one's respective area electrical network exists oscillation source, navigate to which wind energy turbine set concrete and collect station for oscillation source, for analyze cause sub-synchronous oscillation to occur reason and take further control measure to take a firm foundation, this programme only needs to gather the local information of load-center substation can locate oscillation source in the electrical network of one's respective area, do not rely on different substation Wide-area Measurement Information and communication network, be convenient to Practical Project implement.
In embodiments of the present invention, when regional power grid generation sub-synchronous oscillation being detected, signal transacting is carried out to each power line in regional power grid and major network interconnection and one's respective area electrical network, leach the m-Acetyl chlorophosphonazo voltage on regional power grid and major network interconnection, current component also calculates m-Acetyl chlorophosphonazo impedance, leach the fluctuating power in each line power, m-Acetyl chlorophosphonazo impedance according to regional power grid and major network interconnection judges whether there is oscillation source in the electrical network of one's respective area, if there is oscillation source, the same tone according to power line fluctuating power variation track each in regional power grid and interconnection fluctuating power variation track determines concrete oscillation source.
Embodiment 2
Fig. 3 is the realization flow schematic diagram two of this sub-synchronous oscillation source electricity method, and as shown in Figure 3, this sub-synchronous oscillation source electricity method comprises:
Step S201: regional power grid and major network each interconnection input analog amount synchronized sampling, and each branch road analog quantity merging of synchronized sampling is drawn interconnection total current, gross power;
Particularly, wind power base load-center substation is connected with system by double loop as shown in Figure 4, first voltage, the current signal of synchronized sampling interconnection 1 and interconnection 2, merge and show that regional power grid flows to total current and the gross power of major network, as interconnection total current, the total power signal of follow-up judgement, and the interconnection after being merged by signal is considered as total interconnection.
Step S202: carry out sub-synchronous oscillation detection according to the total current of regional power grid and major network interconnection, total power signal, draw testing result, concrete grammar is: setting current fluctuation threshold value, power fluctuation threshold value and a stack features frequency, and arbitrary condition below meeting then testing result is generation sub-synchronous oscillation:
1) when interconnection total current effective value fluctuation range is more than or equal to current fluctuation threshold value, and total current vibration frequency meets arbitrary frequecy characteristic in this stack features frequency described;
2) interconnection gross power fluctuation range is more than or equal to power fluctuation threshold value, and gross power vibration frequency meets arbitrary frequecy characteristic in this stack features frequency described.
This stack features frequency described generally comprises more than 6 characteristic frequencies, judges whether the frequency of sub-synchronous oscillation meets a certain characteristic frequency f
nfeature has two kinds of methods usually:
Method one: sub-synchronous oscillation frequency and characteristic frequency f
nthe absolute value of difference be less than the error threshold definite value of setting, n gets non-zero natural number;
Method two: to each characteristic frequency f
na low scope definite value f of characteristic frequency is set respectively
nLwith characteristic frequency high scope definite value f
nH,when sub-synchronous oscillation frequency is greater than f
nLand be less than f
nHthen think and meet this characteristic frequency feature, n gets non-zero natural number.
When detecting sub-synchronous oscillation, in the situation of wind power base as shown in Figure 4 by two-wire and Major Networks, to the power line of wind-powered electricity generation 7, signal transacting is carried out to interconnection and wind-powered electricity generation 1, leach the m-Acetyl chlorophosphonazo voltage on total interconnection, current component calculate m-Acetyl chlorophosphonazo impedance, leach total interconnection and wind-powered electricity generation 1 to the fluctuating power in the power line power of wind-powered electricity generation 7.
Step S203: the m-Acetyl chlorophosphonazo impedance according to regional power grid and the total interconnection of major network judges whether there is oscillation source in the electrical network of one's respective area, draws judged result;
Particularly, when the real part of m-Acetyl chlorophosphonazo impedance is just, then judged result is that one's respective area electrical network exists oscillation source.
Step S204: described testing result is regional power grid generation sub-synchronous oscillation, and described judged result is there is oscillation source in regional power grid, then determine concrete oscillation source according to the same tone of power line fluctuating power variation track each in regional power grid and total interconnection fluctuating power variation track.
Particularly, in the situation of wind power base as shown in Figure 4 by two-wire and Major Networks, then determine concrete oscillation source according to wind-powered electricity generation 1 to the power line fluctuating power variation track of wind-powered electricity generation 7 and the same tone of total interconnection fluctuating power variation track, below the power line of arbitrary wind energy turbine set meets, three conditions then judge that this power line is oscillation source:
1) within a sub-synchronous oscillation cycle, the duration that power line fluctuating power is contrary with the symbol of total interconnection fluctuating power to time-derivative to the symbol of time-derivative is greater than K
1× sub-synchronous oscillation the cycle, K
1generally get 0.75;
2) within a sub-synchronous oscillation cycle, the time interval between the moment that power line fluctuating power maximum occurs and the moment that total interconnection fluctuating power minimum value occurs is less than K
2× sub-synchronous oscillation the cycle, K
2generally get 0.25;
3) within a sub-synchronous oscillation cycle, the time interval between the moment that power line fluctuating power minimum value occurs and the moment that total interconnection fluctuating power maximum occurs is less than K
3× sub-synchronous oscillation the cycle, K
3generally get 0.25.
Suppose that the electric power incoming line of wind-powered electricity generation 6 in certain vibration meets above-mentioned feature, then judge that wind-powered electricity generation 6 is as sub-synchronous oscillation source.
By sub-synchronous oscillation source electricity method described in the embodiment of the present invention, when regional power grid generation sub-synchronous oscillation being detected, whether oscillation source is there is in the electrical network of online real-time judge one's respective area, if one's respective area electrical network exists oscillation source, navigate to which wind energy turbine set concrete and collect station for oscillation source, for analyze cause sub-synchronous oscillation to occur reason and take further control measure to take a firm foundation, this programme only needs to gather the local information of load-center substation can locate oscillation source in the electrical network of one's respective area, do not rely on different substation Wide-area Measurement Information and communication network, be convenient to Practical Project implement.
Embodiment 3
Fig. 5 is the composition structural representation of this sub-synchronous oscillation source electricity device, and as shown in Figure 5, described device comprises sub-synchronous oscillation detection module 301, signal processing module 302, oscillation source judge module 303 and oscillation source locating module 304; Wherein,
Whether described sub-synchronous oscillation detection module 301, there is sub-synchronous oscillation for surveyed area electrical network, obtain testing result;
Described signal processing module 302, for carrying out signal transacting to each power line in regional power grid and major network interconnection and one's respective area electrical network, leach the m-Acetyl chlorophosphonazo voltage on regional power grid and major network interconnection, current component calculate m-Acetyl chlorophosphonazo impedance, leach the fluctuating power in each line power;
Described oscillation source judge module 303, for judging whether there is oscillation source in the electrical network of one's respective area according to the m-Acetyl chlorophosphonazo impedance of regional power grid and major network interconnection, draws judged result;
Described oscillation source locating module 304, when described testing result is regional power grid generation sub-synchronous oscillation, and described judged result is there is oscillation source in regional power grid, the same tone according to power line fluctuating power variation track each in regional power grid and interconnection fluctuating power variation track determines concrete oscillation source.
In actual applications, each unit that each module in the described sub-synchronous oscillation source electricity device provided in the embodiment of the present invention and each module thereof comprise all can be realized by the processor in described device, also can be realized by concrete logical circuit; Such as, in actual applications, can realize by being positioned at the central processing unit (CPU) of described device, microprocessor (MPU), digital signal processor (DSP) or field programmable gate array (FPGA).
The above; be only the specific embodiment of the present invention, but protection scope of the present invention is not limited thereto, is anyly familiar with those skilled in the art in the technical scope that the present invention discloses; change can be expected easily or replace, all should be encompassed within protection scope of the present invention.
Claims (9)
1. a sub-synchronous oscillation source electricity method, is characterized in that, described method comprises:
Carry out sub-synchronous oscillation detection according to the electric current of regional power grid and major network interconnection, power signal, draw testing result;
When detecting sub-synchronous oscillation, signal transacting is carried out to each power line in regional power grid and major network interconnection and one's respective area electrical network, leach the m-Acetyl chlorophosphonazo voltage on regional power grid and major network interconnection, current component calculate m-Acetyl chlorophosphonazo impedance, leach the fluctuating power in each line power;
M-Acetyl chlorophosphonazo impedance according to regional power grid and major network interconnection judges whether there is oscillation source in the electrical network of one's respective area, draws judged result;
When described testing result is regional power grid generation sub-synchronous oscillation, and described judged result is when there is oscillation source in regional power grid, then determine concrete oscillation source according to the same tone of power line fluctuating power variation track each in regional power grid and interconnection fluctuating power variation track.
2. method according to claim 1, it is characterized in that, the method of carrying out sub-synchronous oscillation detection is: setting current fluctuation threshold value, power fluctuation threshold value and a stack features frequency, and arbitrary condition below meeting then testing result is generation sub-synchronous oscillation:
1) when interconnection current effective value fluctuation range is more than or equal to current fluctuation threshold value, and current fluctuation frequency meets arbitrary frequecy characteristic in a described stack features frequency;
2) interconnection tie power fluctuation scope is more than or equal to power fluctuation threshold value, and power fluctuation frequency meets arbitrary frequecy characteristic in a described stack features frequency.
3. method according to claim 1, is characterized in that: when the real part of m-Acetyl chlorophosphonazo impedance is that just then judged result is that one's respective area electrical network exists oscillation source.
4. method according to claim 1, it is characterized in that,: the same tone according to power line fluctuating power variation track each in regional power grid and interconnection fluctuating power variation track determines concrete oscillation source, and below arbitrary power line meets, three conditions then judge that this power line is oscillation source:
1) within a sub-synchronous oscillation cycle, the duration that power line fluctuating power is contrary with the symbol of interconnection fluctuating power to time-derivative to the symbol of time-derivative is greater than K
1× sub-synchronous oscillation the cycle, K
1get 0.75;
2) within a sub-synchronous oscillation cycle, the time interval between the moment that power line fluctuating power maximum occurs and the moment that interconnection fluctuating power minimum value occurs is less than K
2× sub-synchronous oscillation the cycle, K
2get 0.25;
3) within a sub-synchronous oscillation cycle, the time interval between the moment that power line fluctuating power minimum value occurs and the moment that interconnection fluctuating power maximum occurs is less than K
3× sub-synchronous oscillation the cycle, K
3get 0.25.
5., according to the method described in claim 2, it is characterized in that: a described stack features frequency comprises more than 6 characteristic frequencies, judge whether the frequency of sub-synchronous oscillation meets a certain characteristic frequency f
nfeature has two kinds of methods:
Method one: sub-synchronous oscillation frequency and characteristic frequency f
nthe absolute value of difference be less than the error threshold definite value of setting, n gets non-zero natural number;
Method two: to each characteristic frequency f
na low scope definite value f of characteristic frequency is set respectively
nLwith characteristic frequency high scope definite value f
nH, when sub-synchronous oscillation frequency is greater than f
nLand be less than f
nHthen think and meet this characteristic frequency feature, n gets non-zero natural number.
6. a sub-synchronous oscillation source electricity device, is characterized in that: comprise sub-synchronous oscillation detection module, signal processing module, oscillation source judge module and oscillation source locating module;
Described sub-synchronous oscillation detection module is used for surveyed area electrical network and whether sub-synchronous oscillation occurs, and obtains testing result;
Described signal processing module is used for carrying out signal transacting to each power line in regional power grid and major network interconnection and one's respective area electrical network, leach the m-Acetyl chlorophosphonazo voltage and current component on regional power grid and major network interconnection, and calculate m-Acetyl chlorophosphonazo impedance, leach the fluctuating power in each line power;
Described oscillation source judge module is used for judging whether there is oscillation source in the electrical network of one's respective area according to the m-Acetyl chlorophosphonazo impedance of regional power grid and major network interconnection, draws judged result;
Described oscillation source locating module is used for when described testing result is regional power grid generation sub-synchronous oscillation, and described judged result is when there is oscillation source in regional power grid, the same tone according to power line fluctuating power variation track each in regional power grid and interconnection fluctuating power variation track determines concrete oscillation source.
7. device according to claim 6, it is characterized in that: described sub-synchronous oscillation detection module, when places synchronized oscillation detects, setting current fluctuation threshold value, power fluctuation threshold value and a stack features frequency, arbitrary condition below meeting then testing result is that sub-synchronous oscillation occurs:
1) when interconnection current effective value fluctuation range is more than or equal to current fluctuation threshold value, and current fluctuation frequency meets arbitrary frequecy characteristic in described one this stack features frequency;
2) interconnection tie power fluctuation scope is more than or equal to power fluctuation threshold value, and power fluctuation frequency meets arbitrary frequecy characteristic in a described stack features frequency.
8. device according to claim 6, is characterized in that: described device also comprises oscillation source judge module;
When the real part of m-Acetyl chlorophosphonazo impedance is timing, described oscillation source judge module judged result is that one's respective area electrical network exists oscillation source.
9. device according to claim 6, it is characterized in that: also comprise oscillation source locating module, oscillation source locating module determines concrete oscillation source according to the same tone of power line fluctuating power variation track each in regional power grid and interconnection fluctuating power variation track, and below arbitrary power line meets, three conditions then judge that this power line is oscillation source:
1) within a sub-synchronous oscillation cycle, the duration that power line fluctuating power is contrary with the symbol of interconnection fluctuating power to time-derivative to the symbol of time-derivative is greater than K
1× sub-synchronous oscillation the cycle, K
1get 0.75;
2) within a sub-synchronous oscillation cycle, the time interval between the moment that power line fluctuating power maximum occurs and the moment that interconnection fluctuating power minimum value occurs is less than K
2× sub-synchronous oscillation the cycle, K
2get 0.25;
3) within a sub-synchronous oscillation cycle, the time interval between the moment that power line fluctuating power minimum value occurs and the moment that interconnection fluctuating power maximum occurs is less than K
3× sub-synchronous oscillation the cycle, K
3get 0.25.
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Cited By (13)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN105891625A (en) * | 2016-01-26 | 2016-08-24 | 清华大学 | Power system subsynchronous oscillation disturbance source identification method based on energy flow |
| CN106154111A (en) * | 2016-06-22 | 2016-11-23 | 南京南瑞继保电气有限公司 | A kind of m-Acetyl chlorophosphonazo occurring source localization method and device |
| 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 |
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| CN112384813A (en) * | 2018-07-06 | 2021-02-19 | 乌本产权有限公司 | Wind energy system and method for detecting low-frequency oscillations in an electrical supply network |
| CN111077404A (en) * | 2018-10-22 | 2020-04-28 | 财团法人工业技术研究院 | Disturbance source positioning method |
| US11340601B2 (en) | 2018-10-22 | 2022-05-24 | Industrial Technology Research Institute | Disturbance source positioning method |
| CN113364009A (en) * | 2021-06-22 | 2021-09-07 | 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 |
| 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 |
| WO2023206959A1 (en) * | 2022-04-28 | 2023-11-02 | 北京天诚同创电气有限公司 | Micro-grid control method and apparatus, and power supply control method and apparatus |
| CN114928075A (en) * | 2022-05-23 | 2022-08-19 | 国家电网有限公司华东分部 | Subsynchronous oscillation control method based on instantaneous active power of power grid line |
| 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 |
| CN115498652A (en) * | 2022-05-30 | 2022-12-20 | 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 |
| 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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