CN108008218A - A kind of micro-, minor scale power net running rate recognizing method - Google Patents
A kind of micro-, minor scale power net running rate recognizing method Download PDFInfo
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- CN108008218A CN108008218A CN201711205995.5A CN201711205995A CN108008218A CN 108008218 A CN108008218 A CN 108008218A CN 201711205995 A CN201711205995 A CN 201711205995A CN 108008218 A CN108008218 A CN 108008218A
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- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
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Abstract
The present invention provides a kind of micro-, minor scale power net running rate recognizing method, includes the following steps：Obtain the first frequency f of bulk power grid respectively at the multiple first acquisition moment ts(t)；Initialization data group；Second in separated in time obtains moment t respectively1Moment t is obtained with the 3rd2Obtain micro-, minor scale power net second frequency fx(t1) and the 3rd frequency fx(t2)；Obtain the first reference frequency fs(t1), the second reference frequency fs(t2)；Judge | fs(t1)‑fx(t1) | whether less than first threshold δ, | fs(t2)‑fx(t2) | whether less than second threshold ε and | m n | whether less than the 3rd threshold value η, if so, data " 1 " are write in data group, if it is not, writing data " 0 " in data group；Data judging in data group is micro- after n times repeat, operating status of minor scale power net.The present invention can effectively identify micro-, minor scale power net operating status, and recognition accuracy is high, and be avoided that isolated island is judged by accident, no limitation.
Description
Technical field
The present invention relates to a kind of micro-, minor scale power net running rate recognizing method.
Background technology
Bulk power grid power supply is current main power grid networking and power supply mode, with bulk power grid and depositing, also have micro-capacitance sensor and
Micro-, minor scale power net, under normal circumstances, micro-, minor scale power net are incorporated to bulk power grid operation, form one large-scale AC synchronous power grid.When due to
Some reasons, after micro-, minor scale power net departs from bulk power grid, under the action of its own power, voltage, frequency stabilization control system, still
So it is likely to be under steady operational status, at this time, island operation state can be referred to as.Isolated island is once produced entail dangers to bulk power grid
The safety of maintenance personal, operation program, the impact bulk power grid of the protection switch for influencing bulk power grid distribution system are protected on transmission line of electricity
Protection unit etc., it is therefore necessary to can identify micro-, minor scale power net in island operation state in time.
In the prior art, identification isolated network has passive detection method, active detecting method and on off state monitoring method.Passively
Detection method mainly forms front and rear voltage, frequency and phase instantaneous variation by measuring isolated island in point of common coupling (PCC)
Situation identifies isolated island；Active detecting method is voltage, electric current or the phase by adding very little in the control signal of inverter
Phase perturbation signal, detection isolated island form the state of disturbance of front and rear Injection Signal, are identified so as to fulfill isolated island；On off state monitoring side
Method mainly utilizes means of communication, to detect the state of cut-offfing of breaker, and sends carrier signal in bulk power grid side, and is installed on
Change according to these signals is determined whether that there occurs isolated island by micro-, minor scale power net side receiver.Above-mentioned three kinds of isolated islands detection
Method must be detected and more grid-connected fortune there are check frequency using the device on micro-, minor scale power net is fixedly mounted on
Signal before and after row and the switching of islet operation both of which, just can determine that whether micro-, minor scale power net is in island operation state, it is impossible to
It is independent intuitively to detect isolated island.
On the other hand, if larger frequency disturbance locally occurs for bulk power grid, which will produce in bulk power grid
Electromechanical ripple, electromechanical ripple, by routeing proximal and distal gradually propagation along disturbance scene, are caused with the spread speed far below the light velocity
The amplitude of the frequency change of different location is different in bulk power grid, and the time that frequency variation reaches maximum is also different, makes big electricity
Obvious spatial and temporal distributions characteristic is presented in the first frequency of net, and when carrying out island operation state identification, this characteristic is be easy to cause
Isolated island is judged by accident, micro-, the minor scale power net that are not in island operation state is judged to be in island operation state, so as to cause isolated island
Recognition methods has certain limitation, may be only available for bulk power grid datum mark and the feelings micro-, minor scale power net measurement point is closer to the distance
Condition.
The content of the invention
The purpose of the present invention is in view of the deficiencies of the prior art, propose a kind of micro-, minor scale power net running rate recognizing method, energy
Enough effectively to identify micro-, minor scale power net operating status, recognition accuracy is high, and is avoided that isolated island is judged by accident, no limitation.
The present invention is achieved through the following technical solutions：
A kind of micro-, minor scale power net running rate recognizing method, includes the following steps：
A, the first frequency f of bulk power grid is obtained respectively at the multiple first acquisition moment ts(t)；
B, initialization data group, data group are the data group of 1 × N；
C, second respectively in separated in time obtains moment t1Moment t is obtained with the 3rd2Obtain micro-, minor scale power net
Two frequency fx(t1) and the 3rd frequency fx(t2), second obtains moment t1Moment t is obtained with the 3rd2Obtained respectively with certain two first
Moment, t was identical；
D, t=t is obtained1When bulk power grid first frequency as the first reference frequency fs(t1), obtain t=t2When bulk power grid
First frequency as the second reference frequency fs(t2)；
E, f is judgeds(t1) and second frequency fx(t1) absolute difference | fs(t1)-fx(t1) | whether less than first threshold δ,
fs(t2) and the 3rd frequency fx(t2) absolute difference | fs(t2)-fx(t2) | whether less than second threshold ε and the first reference frequency fs
(t1) and the second reference frequency fs(t2) change rate absolute valueWith second frequency fx(t1) and the 3rd frequency
Rate fx(t2) change rate absolute valueAbsolute difference | m-n | whether less than the 3rd threshold value η, if
It is that position write-in data " 1 " are corresponded in data group, if it is not, corresponding to position write-in data " 0 " in data group；
F, n times repeat step B is to step D, wherein, N >=2；
G, judge N number of data whether all 1 in data group, if so, entering step I, otherwise, enter step H；
H, judge N number of data whether all 0 in data group, if so, entering step J, otherwise, enter step K；
I, judge that micro-, minor scale power net is in grid-connected state；
J, judge that micro-, minor scale power net is in island operation state；
K, judge that micro-, minor scale power net is in grid-connected state, but there are frequency disturbance for bulk power grid.
Further, described second moment t is obtained1Moment t is obtained with the 3rd2Between interlude be 10s to 600s.
Further, the step A includes：
A1, from each first obtain moment t, the one reliable electric connecting portion of continuous acquisition bulk power grid in setting time
Voltage waveform；
A2, according to voltage waveform and setting time, calculate the first first frequency f for obtaining moment t bulk power grids(t)。
Further, the step C includes：
C1, obtain moment t from second respectively1Moment t is obtained with the 3rd2Rise, continuous acquisition is micro- in setting time, small electricity
Net the voltage waveform at any powered position；
C2, according to voltage waveform and setting time, calculate second and obtain moment t1Moment t is obtained with the 3rd2Corresponding second
Frequency fx(t1) and the 3rd frequency fx(t2)。
Further, the first threshold δ value ranges are：0.001Hz≤δ≤0.005Hz.
Further, the second threshold ε value ranges are：0.001Hz≤ε≤0.005Hz.
Further, the 3rd threshold value η value ranges are：
The present invention has the advantages that：
1st, the present invention judges fs(t1) and second frequency fx(t1) absolute difference | fs(t1)-fx(t1) | whether less than first
Threshold value δ, fs(t2) and the 3rd frequency fx(t2) absolute difference | fs(t2)-fx(t2) | whether less than second threshold ε and the first benchmark
Frequency fs(t1) and the second reference frequency fs(t2) change rate absolute valueWith second frequency fx(t1) and
3rd frequency fx(t2) change rate absolute valueAbsolute difference | m-n | whether less than the 3rd threshold
Value η, and position write-in data " 1 " or " 0 " are corresponded in data group according to judging result, n times repeat above-mentioned multilevel iudge process
Afterwards, when N number of data in data group it is all 1 when, judge that micro-, minor scale power net is in grid-connected state, when N number of in data group
Data it is all 0 when, judge that micro-, minor scale power net be in island operation state, otherwise, it is determined that micro-, minor scale power net is in the shape that is incorporated into the power networks
State, but there are frequency disturbance, n times repetition multilevel iudge process, it is possible to increase recognition accuracy, moreover it is possible to avoid due to big for bulk power grid
Isolated island is judged by accident caused by electromechanical wave frequency rate disturbance occurs for power grid, and bulk power grid datum mark and micro-, minor scale power net measurement point distance are not
The factor for influencing recognition result correctness can be become, use no limitation.
2nd, interlude is 10s to 600s between second, third of the invention obtains the moment, large and small in the section
The frequency fluctuation of power grid is the most obvious, can significantly improve the accuracy of recognition result.
Brief description of the drawings
The present invention is described in further details below in conjunction with the accompanying drawings.
Fig. 1 is the functional block diagram of present system.
Fig. 2 is the flow chart of the method for the present invention.
Embodiment
As depicted in figs. 1 and 2, isolated network identifying system is used to identify whether micro-, minor scale power net 2 in bulk power grid 1 are in isolated island
Operating status, according to electrotechnics principle, for the ac grid system of a normal operating condition, no matter the system is single
Power-supply system or multi-power system, in the different nodes of power grid, its frequency, frequency change rate are identical, its power frequency stable states
The changing rule of voltage waveform meetsIn formula, UNFor rated voltage, f is mains frequency,
T ' is the time, and θ is phase angle.Ideally, different at the time of t ' in the electric voltage frequency f measured by any place of power grid
Perseverance is 50Hz.In the power grid of steady-state operation, although the numerical value of frequency f is constantly in dynamic change, synchronization, power grid
The electric voltage frequency that any position is surveyed is identical all the time, its frequency variation curve is also consistent, its frequency change rate is also protected
Hold consistent；But for different AC networks, as the bulk power grid 1 in the present invention and micro-, minor scale power net 2, its respective frequency are general
All the time there is fine distinction, frequency variation curve simultaneously to differ, its frequency change rate also differs.Therefore, it is possible to pass through
Compare mutually whether bulk power grid 1 and micro-, minor scale power net 2 frequency identical in the same time, bulk power grid 1 and micro-, small electricity in the same intervals moment
Whether the frequency change rate of net 2 is identical, to identify whether micro-, minor scale power net 2 is in island operation state.
As depicted in figs. 1 and 2, isolated network identifying system includes benchmark acquisition device 3 and 3 wireless communication of benchmark acquisition device
The server 4 of connection, the knowledge being connected to proportion acquisition device 5, respectively with server 4 and to 5 wireless communication of proportion acquisition device
Other device 6, the display device 7 being connected with identification device 6.
Benchmark acquisition device 3 includes being used for the first voltage for gathering 1 one reliable electric connecting portion voltage waveform of bulk power grid
Harvester 31, the first microcontroller 32 being connected with first voltage harvester 31, be connected respectively with the first microcontroller 31
One gps clock device 33 and first communication device 34, the first microcontroller 32 pass through first communication device 34 and 4 channel radio of server
Letter connection, in the present embodiment, reliable electric connecting portion refers to the low-pressure side bus of the substation of bulk power grid 1, and first voltage is adopted
Acquisition means 31 include first voltage mutual inductor, and first voltage mutual inductor is fixed on the first high resistance insulating bar top, in use, behaviour
The first high resistance insulating bar is held as personnel first voltage mutual inductor can be contacted with low-pressure side bus, and then gathers its voltage
Waveform, the first gps clock device 33 is according to gps satellite 8 come prover time, and the first gps clock device is when multiple first obtain
Carve t and send the first trigger signal to first voltage harvester 31 respectively, first voltage harvester 31 receives the first triggering
Be triggered startup after signal, in the voltage waveform of the low-pressure side bus of the interior continuous acquisition substation of setting time (such as 0.1s),
One microcontroller 32 is by the number divided by setting time of the voltage waveform collected in setting time, you can obtains the frequency of bulk power grid 1
Rate fs(t)。
Proportion acquisition device 5 is included adopting for gathering micro-, any powered site voltage waveform of minor scale power net 2 second voltage
Acquisition means 51, the second singlechip 52 being connected with second voltage harvester 51, be connected respectively with second singlechip 52 second
Gps clock device 53 and secondary communication device 54, second singlechip 52 pass through secondary communication device 54 and 6 channel radio of identification device
Letter connection, in the present embodiment, second voltage harvester 51 includes second voltage mutual inductor, and second voltage mutual inductor is fixed on
Second high resistance insulating bar top, in use, operating personnel hold the second high resistance insulating bar can be by second voltage mutual inductor
With any powered location contacts in micro-, minor scale power net 2, and then its voltage waveform is gathered, the second gps clock device 53 is according to GPS
Satellite 8 carrys out prover time, and second in separated in time obtains moment t respectively1, the 3rd obtain moment t2Adopted to second voltage
Acquisition means 51 send the second trigger signal, and second voltage harvester 51 receives the startup that is triggered after the second trigger signal,
The voltage waveform at any powered position of setting time (such as 0.1s) interior continuous acquisition, second singlechip 52 will gather in setting time
The number divided by setting time of the voltage waveform arrived, you can obtain micro-, minor scale power net 2 second frequency fx(t1) and the 3rd frequency fx
(t2)。
Since bulk power grid 1 and the frequency fluctuation within the relatively short time of micro-, minor scale power net 2 are the most obvious, second obtains
Moment t1, the 3rd obtain moment t2Between interlude can be 10s to 600s, in the present embodiment, took for the second acquisition moment
t1, the 3rd obtain moment t2Between interlude be 100s.
The 3rd microcontroller 61 that identification device 6 includes and the third communication device 62 being connected with the 3rd microcontroller 61, the 3rd
Microcontroller 61 is connected by third communication device 62 with 4 wireless communication of server, and the 3rd microcontroller 61 passes through secondary communication device
54 are connected with to 5 wireless communication of proportion acquisition device, are stored with the data group of 1 × N in the 3rd microcontroller 61, each number in data group
It is 0 according to state.3rd microcontroller 61 is downloaded from server 4 and obtains moment t with second1Identical first was obtained corresponding to moment t
Frequency and as the first reference frequency fs(t1), download with the 3rd obtain moment t2It is right that identical first obtains the moment
The frequency answered and as the second reference frequency fs(t2), judge second frequency fx(t1) and the first reference frequency fs(t1) difference
It is worth first threshold δ, the 3rd frequency f that whether absolute value is less than settingx(t2) and the second reference frequency fs(t2) absolute difference
Whether the second threshold ε and first reference frequency f of setting are less thans(t1), the second reference frequency fs(t2) change rate absolute value with
Second frequency fx(t1), the 3rd frequency fx(t2) change rate absolute value absolute difference whether be less than setting the 3rd threshold value
η, position write-in " 1 " or " 0 ", n times repeating above said collection frequency, the mistake of multilevel iudge are corresponded to according to judging result into data group
Cheng Hou, data judging in data group is micro-, minor scale power net operating status.Display device 7 includes connecting with the 3rd microcontroller 61
Connect the LED display that result is judged with real-time display.
Micro-, minor scale power net running rate recognizing method, includes the following steps：
A, the first frequency f of bulk power grid is obtained respectively at the multiple first acquisition moment ts(t), specifically include：
A1, from each first obtain moment t, the one reliable electric connecting portion of continuous acquisition bulk power grid in setting time
Voltage waveform；
A2, according to voltage waveform and setting time, calculate the first first frequency f for obtaining moment t bulk power grids(t)；
B, initialization data group, data group are the data group of 1 × N, and the init state of each data is 0 in data group, its
In, N >=2；
C, second respectively in separated in time obtains moment t1Moment t is obtained with the 3rd2Obtain micro-, minor scale power net
Two frequency fx(t1) and the 3rd frequency fx(t2), second obtains moment t1Moment t is obtained with the 3rd2Obtained respectively with certain two first
Moment, t was identical, specifically included：
C1, obtain moment t from second respectively1Moment t is obtained with the 3rd2Rise, continuous acquisition is micro- in setting time, small electricity
Net the voltage waveform at any powered position；
C2, according to voltage waveform and setting time, calculate second and obtain moment t1Moment t is obtained with the 3rd2Corresponding second
Frequency fx(t1) and the 3rd frequency fx(t2)；
D, t=t is obtained1When bulk power grid first frequency as the first reference frequency fs(t1), obtain t=t2When bulk power grid
First frequency as the second reference frequency fs(t2)；
E, f is judgeds(t1) and second frequency fx(t1) absolute difference | fs(t1)-fx(t1) | whether less than first threshold δ,
fs(t2) and the 3rd frequency fx(t2) absolute difference | fs(t2)-fx(t2) | whether less than second threshold ε and the first reference frequency fs
(t1) and the second reference frequency fs(t2) change rate absolute valueWith second frequency fx(t1) and the 3rd frequency
Rate fx(t2) change rate absolute valueAbsolute difference | m-n | whether less than the 3rd threshold value η, if
It is that position write-in data " 1 " are corresponded in data group, if it is not, corresponding to position write-in data " 0 " in data group, ith judges, then
In the i-th bit write-in data " 1 " or " 0 " of data group, wherein, the value range of first threshold δ for 0.001Hz≤δ≤
0.005Hz；The value range of second threshold ε is：0.001Hz≤ε≤0.005Hz；The value range of 3rd threshold value η is：
F, n times repeat step B to step D；
G, judge N number of data whether all 1 in data group, if so, entering step I, otherwise, enter step H；
H, judge N number of data whether all 0 in data group, if so, entering step J, otherwise, enter step K；
I, judge that micro-, minor scale power net is in grid-connected state；
J, judge that micro-, minor scale power net is in island operation state；
K, judge that micro-, minor scale power net is in grid-connected state, but there are frequency disturbance for bulk power grid.
The foregoing is only a preferred embodiment of the present invention, therefore the scope that the present invention is implemented cannot be limited with this, i.e.,
The equivalent changes and modifications made according to scope of the present invention patent and description, all should still belong to what patent of the present invention covered
In the range of.
Claims (7)
- A kind of 1. micro-, minor scale power net running rate recognizing method, it is characterised in that：Include the following steps：A, the first frequency f of bulk power grid is obtained respectively at the multiple first acquisition moment ts(t)；B, initialization data group, data group are the data group of 1 × N；C, second respectively in separated in time obtains moment t1Moment t is obtained with the 3rd2Obtain micro-, minor scale power net the second frequency Rate fx(t1) and the 3rd frequency fx(t2), second obtains moment t1Moment t is obtained with the 3rd2Respectively the moment are obtained with certain two first T is identical；D, t=t is obtained1When bulk power grid first frequency as the first reference frequency fs(t1), obtain t=t2When bulk power grid first Frequency is as the second reference frequency fs(t2)；E, f is judgeds(t1) and second frequency fx(t1) absolute difference | fs(t1)-fx(t1) | whether less than first threshold δ, fs(t2) With the 3rd frequency fx(t2) absolute difference | fs(t2)-fx(t2) | whether less than second threshold ε and the first reference frequency fs(t1) and Second reference frequency fs(t2) change rate absolute valueWith second frequency fx(t1) and the 3rd frequency fx (t2) change rate absolute valueAbsolute difference | m-n | whether less than the 3rd threshold value η, if so, Position write-in data " 1 " are corresponded in data group, if it is not, corresponding to position write-in data " 0 " in data group；F, n times repeat step B is to step D, wherein, N >=2；G, judge N number of data whether all 1 in data group, if so, entering step I, otherwise, enter step H；H, judge N number of data whether all 0 in data group, if so, entering step J, otherwise, enter step K；I, judge that micro-, minor scale power net is in grid-connected state；J, judge that micro-, minor scale power net is in island operation state；K, judge that micro-, minor scale power net is in grid-connected state, but there are frequency disturbance for bulk power grid.
- 2. one kind according to claim 1 is micro-, minor scale power net running rate recognizing method, it is characterised in that：Described second obtains Take moment t1Moment t is obtained with the 3rd2Between interlude be 10s to 600s.
- 3. one kind according to claim 1 is micro-, minor scale power net running rate recognizing method, it is characterised in that：The step A bags Include：A1, from each first obtain moment t, the electricity of one reliable electric connecting portion of continuous acquisition bulk power grid in setting time Corrugating；A2, according to voltage waveform and setting time, calculate the first first frequency f for obtaining moment t bulk power grids(t)。
- A kind of 4. micro-, minor scale power net running rate recognizing method according to claim 1 or 2 or 3, it is characterised in that：It is described Step C includes：C1, obtain moment t from second respectively1Moment t is obtained with the 3rd2Rise, continuous acquisition is micro- in setting time, minor scale power net is appointed The voltage waveform at one powered position；C2, according to voltage waveform and setting time, calculate second and obtain moment t1Moment t is obtained with the 3rd2Corresponding second frequency fx(t1) and the 3rd frequency fx(t2)。
- A kind of 5. micro-, minor scale power net running rate recognizing method according to claim 1 or 2 or 3, it is characterised in that：It is described First threshold δ value ranges are：0.001Hz≤δ≤0.005Hz.
- A kind of 6. micro-, minor scale power net running rate recognizing method according to claim 1 or 2 or 3, it is characterised in that：It is described Second threshold ε value ranges are：0.001Hz≤ε≤0.005Hz.
- A kind of 7. micro-, minor scale power net running rate recognizing method according to claim 1 or 2 or 3, it is characterised in that：It is described 3rd threshold value η value ranges are：
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Application publication date: 20180508 |