CN104156412B - A kind of electrical energy power quality disturbance event category monitoring method based on Complex event processing - Google Patents
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Abstract
The invention discloses a kind of electrical energy power quality disturbance event category monitoring method based on Complex event processing belonged in Power Quality Monitoring Technology field.Including：Extract the characteristic value of primary signal and the characteristic value of extraction is screened；Atomic event is determined according to the characteristic value after screening；Complicated event is described using the combining form of atomic event；Determine complicated event pattern；Using Complex event processing engine detection of complex event schema, the corresponding complicated event of complicated event pattern is obtained；According to complicated event and the mapping relations of classification output result, the classification output result of complicated event is determined.The present invention can carry out effective classification to the type of electrical energy power quality disturbance event, more rapidly, monitor go out Power Quality Disturbance.
Description
Technical field
The invention belongs to Power Quality Monitoring Technology field, more particularly to a kind of quality of power supply based on Complex event processing
Disturbance event classification monitoring method.
Background technology
Gradually formed with the development of science and technology with electricity market, power quality problem turned into power system each
Department extremely pays close attention to and made great efforts perfect important indicator.High-quality electric energy improves production for ensureing power grid security, economical operation
Quality and guarantee resident's normal life important in inhibiting.
In recent years, industrial technology is developed rapidly, and the load configuration of power network there occurs great change.On the one hand, with electric power
The extensive use of electronic technology, substantial amounts of non-linear, impact and uncompensated load pour in power system, cause line voltage ripple
The electric energy such as shape is distorted, system frequency is fluctuated, voltage fluctuation and flicker pollute, and cause the increasingly severe quality of power supply to ask
Topic.On the other hand, the ratio that the electrical equipment such as the computer based on microelectronic component, controller is accounted in electric load significantly increases
Plus, these increasingly automated and intelligentized electronic equipments are more sensitive to the quality of power supply, therefore the quality of power supply is proposed more
High, tightened up requirement.
At present, for Classification of Power Quality Disturbances problem, especially transient power quality problem, understanding it is still sufficiently complete and
Deeply.Transient power quality problem, the Short Duration Power Quality Disturbance such as transition concussion, overvoltage, neutral point drifting, due to it
Having a strong impact on and disturbing to what industrial production and sensitive load were caused, having become the importance of power quality problem, cause
The most attention of people.Transient power quality problem belongs to the extension of stationary power quality problem, and coverage is small, but consequence
But than more serious.Therefore, numerous studies need of work enters before transient power quality problem is examined and administered
OK, it is concentrated mainly on the following aspects：
(1) how Power Quality Disturbance is quickly and accurately monitored and picked out from magnanimity power quality data, be
Further analyze its characteristic and determine its producing cause, and take utility power quality control measure to carry out administering offer foundation.
(2) how advanced computers technology to be analyzed applied to power quality problem, so that formed makes with high engineering
With the analysis method of value.
Data in power system are increased with index speed, therefore how fast and effectively to be analyzed, process, refined number
According to, extracted from the noisy data of magnanimity disturbance characteristic complete disturbing signal automatic Classification and Identification, for assess power train
The system quality of power supply is particularly important.
The content of the invention
It is an object of the present invention to provide a kind of electrical energy power quality disturbance event category monitoring side based on Complex event processing
Method, using electric energy quality monitoring data, finds pattern and trend that the quality of power supply is present, so as to future in mass data
Quality of power supply development makes rational prediction.
To achieve these goals, technical scheme proposed by the present invention is, a kind of electric energy matter based on Complex event processing
Disturbance event classification monitoring method is measured, it is characterized in that methods described includes：
Step 1：Extract the characteristic value of primary signal and the characteristic value of extraction is screened；
Step 2：Atomic event is determined according to the characteristic value after screening；
Step 3：Complicated event is described using the combining form of atomic event；
Step 4：Determine complicated event pattern；
Step 5：Using Complex event processing engine detection of complex event schema, the corresponding complexity of complicated event pattern is obtained
Event；
Step 6：According to complicated event and the mapping relations of classification output result, the classification output knot of complicated event is determined
Really.
The primary signal is recorder data.
The characteristic value includes three-phase voltage percent harmonic distortion maximum, three-phase voltage percent harmonic distortion maximum and minimum
The difference of value, tri-phase unbalance factor, the deviation of three-phase voltage virtual value, the deviation of three-phase voltage, three-phase starting voltage virtual value
With three-phase end voltage virtual value.
The characteristic value according to after screening determines that atomic event is the sieve obtained according to different Eigenvalue Extraction Methods
Characteristic value after choosing determines corresponding atomic event.
It is to be combined different atomic events that the combining form of the use atomic event, which describes complicated event, is obtained
Complicated event.
The present invention can carry out effective classification to the type of electrical energy power quality disturbance event, and more rapidly, monitor goes out
Power Quality Disturbance.
Brief description of the drawings
Fig. 1 is the electrical energy power quality disturbance event category monitoring method flow chart based on Complex event processing；
Fig. 2 is the flow chart of the disturbance event sorting technique based on Fast Fourier Transform (FFT)；
Fig. 3 is the flow chart that atomic event describes complicated event；
Fig. 4 is the flow chart that complicated event is determined according to classification output result.
Embodiment
Below in conjunction with the accompanying drawings, preferred embodiment is elaborated.It is emphasized that the description below is merely exemplary
, the scope being not intended to be limiting of the invention and its application.
Fig. 1 is the electrical energy power quality disturbance event category monitoring method flow based on Complex event processing that the present invention is provided
Figure, the present invention mainly carries out characteristics extraction to the recording signal of electrical energy power quality disturbance event, is advised according to the screening of characteristic value
Rule, extracts rule, and thus defines disturbance event and its classification mode, is then looked into using Complex event processing engine
Ask, draw the classification results of disturbance event.This method has stronger scalability and applicability.Below with based in quick Fu
The implementation process of the present invention is introduced exemplified by the disturbance sorting technique of leaf transformation.It includes：
Step 1：Extract the characteristic value of primary signal and the characteristic value of extraction is screened.
The present embodiment carries out characteristics extraction to it using recorder data as primary signal, and the extraction of characteristic value can be used
A variety of methods, for example：S-transformation, wavelet transformation, Fast Fourier Transform (FFT) etc..The present embodiment is used in quick Fu to recorder data
Leaf transformation extracts its characteristic value.
The characteristic value extracted from recorder data includes：Three-phase voltage percent harmonic distortion maximum, three-phase voltage harmonic wave are abnormal
The difference of variability maxima and minima, tri-phase unbalance factor, the deviation of three-phase voltage virtual value, the deviation of three-phase voltage, three
Phase starting voltage virtual value and three-phase end voltage virtual value.Wherein.Virtual value refers to root mean square (RMS, Root Mean
Square), be one group of statistics quadratic sum average value square root.
Characteristic value screening is, by the Threshold Analysis to characteristic value, the threshold range of characteristic value to be screened, for disturbing
The classification of dynamic event.
Step 2：Atomic event is determined according to the characteristic value after screening.
After being screened to the characteristic value after extraction, by describing the assorting process of disturbance event, atomic event is determined, is had
Body is as shown in Figure 2.
Characteristic value the selection result (1) is：The collection period of recorder data is more than or equal to 8 cycles, and A, B and C phase voltage are humorous
Maximum in the difference of ripple aberration rate maxima and minima is less than 2% and A, B and C phase voltage percent harmonic distortion maximum
In maximum be more than 4%.Using characteristic value the selection result (1) as atomic event e1, when meeting characteristic value the selection result (1)
When, atomic event e1 occurs, and otherwise atomic event e1 does not occur.In Fig. 2, THD is three-phase voltage percent harmonic distortion maximum,
THDx is the difference of the maxima and minima of three-phase voltage percent harmonic distortion.
Characteristic value the selection result (2) is：The maximum of the deviation of three-phase voltage virtual value is less than 10% and more than -10%.
Using characteristic value the selection result (2) as atomic event e2, when meeting characteristic value the selection result (2), atomic event e2 occurs, no
Then atomic event e2 does not occur.
Characteristic value the selection result (3) is：The maximum of tri-phase unbalance factor be more than 4% and three-phase voltage percent harmonic distortion most
Maximum in big value is more than 4%.When meeting characteristic value the selection result (3), atomic event e3 occurs, otherwise atomic event e3
Do not occur.
Characteristic value the selection result (4) is：The deviation of three-phase voltage virtual value is both greater than -3% and less than 7%.It is special when meeting
During value indicative the selection result (4), atomic event e4 occurs, and otherwise atomic event e4 does not occur.
Characteristic value the selection result (5) is：Three-phase starting voltage virtual value is both greater than equal to 0.9 and less than or equal to 1.1.When full
During sufficient characteristic value the selection result (5), atomic event e5 occurs, and otherwise atomic event e5 does not occur.In Fig. 2, Urms (1) is three-phase
The virtual value of starting voltage.
Characteristic value the selection result (6) is：Three-phase end voltage virtual value is both greater than equal to 0.9 and less than or equal to 1.1.When full
During sufficient characteristic value the selection result (6), atomic event e6 occurs, and otherwise atomic event e6 does not occur.In Fig. 2, Urms (last) is
The virtual value of three-phase end voltage.
Characteristic value the selection result (7) is：At least the minimum value of the deviation of a phase voltage is less than -90% in three-phase voltage.When
When meeting characteristic value the selection result (7), atomic event e7 occurs, and otherwise atomic event e7 does not occur.If certain in three-phase voltage
The minimum value of the deviation of phase voltage is less than -90%, then puts on the first mark to the phase-change pressure.Such as, if the deviation of A phase voltages
Minimum value be less than -90%, then A phase voltages are put on into the outa=5 in the first mark, such as Fig. 2.For another example, A phases and B phases electricity
The minimum value of the deviation of pressure is both less than -90%, then A phase voltages and B phase voltages is all put on into the outa in the first mark, such as Fig. 2
=5 and outb=5.
Characteristic value the selection result (8) is：At least the minimum value of the deviation of a phase voltage is more than -90% in three-phase voltage.When
When meeting characteristic value the selection result (8), atomic event e8 occurs, and otherwise atomic event e8 does not occur.If certain in three-phase voltage
The minimum value of the deviation of phase voltage is more than -90%, then puts on the second mark to the phase voltage.Such as, if the deviation of A phase voltages
Minimum value be more than -90%, then A phase voltages are put on into the outa=4 in the second mark, such as Fig. 2.For another example, A phases and B phases electricity
The minimum value of the deviation of pressure is both greater than -90%, then A phase voltages and B phase voltages is all put on into the outa in the second mark, such as Fig. 2
=4 and outb=4.
Characteristic value the selection result (9) is：At least the maximum of the deviation of a phase voltage is more than+10% in three-phase voltage.When
When meeting characteristic value the selection result (9), atomic event e9 occurs, and otherwise atomic event e9 does not occur.If certain in three-phase voltage
The maximum of the deviation of phase voltage is more than+10%, then puts on the 3rd mark to the phase voltage.Such as, if the deviation of A phase voltages
Maximum be more than+10%, then A phase voltages are put on into the outa=3 in the 3rd mark, such as Fig. 2.For another example, A phases and B phases electricity
The maximum of the deviation of pressure is more than+10%, then A phase voltages and B phase voltages is all put on into the outa=3 in the 3rd mark, such as Fig. 2
And outb=3.
Characteristic value the selection result (10) is：The minimum value of the deviation of three-phase voltage is both greater than -90%.Sieved when meeting characteristic value
When selecting result (10), atomic event e10 occurs, and otherwise atomic event e10 does not occur.Due to the minimum value of the deviation of three-phase voltage
Both greater than -90%, the minimum value of the substantially deviation of A phases, B phases and C phase voltages is both greater than -90%, now A phase voltages, B phases
Voltage and C phase voltages have all put on the second mark, therefore characteristic value the selection result (10) can also be expressed as：A phase voltages, B phases
Voltage and C phase voltages have all put on the second mark.
Characteristic value the selection result (11) is：The maximum of the deviation of three-phase voltage is both greater than+10%.Sieved when meeting characteristic value
When selecting result (11), atomic event e11 occurs, and otherwise atomic event e11 does not occur.Due to the maximum of the deviation of three-phase voltage
Both greater than+10%, the maximum of the substantially deviation of A phases, B phases and C phase voltages is both greater than+10%, now A phase voltages, B phases
Voltage and C phase voltages have all put on the 3rd mark, therefore characteristic value the selection result (11) can also be expressed as：A phase voltages, B phases
Voltage and C phase voltages have all put on the 3rd mark.
Characteristic value the selection result (12) is：At least the minimum value of the deviation of a phase voltage is less than -90% in three-phase voltage.When
When meeting characteristic value the selection result (12), atomic event e12 occurs, and otherwise atomic event e12 does not occur.Due in three-phase voltage
At least the minimum value of the deviation of a phase voltage is less than -90%, an at least phase voltage substantially in A phases, B phases and C phase voltages
The minimum value of deviation is less than -90%, and now an at least phase voltage has put on the first mark in A phase voltages, B phase voltages and C phase voltages
Remember, therefore characteristic value the selection result (12) can also be expressed as：An at least phase voltage in A phase voltages, B phase voltages and C phase voltages
The first mark is put on.
Step 3：Complicated event is described using the combining form of atomic event.
If atomic event e1 occurs, complicated event is wave distortion E1, is represented by E1=e1.
If atomic event e1 does not occur, atomic event e2 occurs and atomic event e3 does not occur, complicated event is wink
Variable oscillation E2, is represented by
If atomic event e1 does not occur, atomic event e2 occurs, atomic event e3 occurs and atomic event e4 does not occur,
Then complicated event is that voltage effective value transient state is out-of-limit, is represented by
If atomic event e1 does not occur, atomic event e2 occurs, atomic event e3 occurs and atomic event e4 occurs,
Complicated event is the normal E4 of the quality of power supply, is represented by
If atomic event e1 does not occur, atomic event e2 does not occur and atomic event e5 does not occur, complicated event is
Starting voltage virtual value exception E5, is represented by
If atomic event e1 does not occur, atomic event e2 does not occur, atomic event e5 occurs and atomic event e6 is not sent out
Raw, then complicated event is that end voltage virtual value does not recover E6, is represented by
If atomic event e1 does not occur, atomic event e2 does not occur, atomic event e5 occur, atomic event e6 occur and
Atomic event e10 occurs, then complicated event is that short time voltage interrupts E10, is represented by
If atomic event e1 does not occur, atomic event e2 does not occur, atomic event e5 occurs, atomic event e6 occurs,
Atomic event e10 does not occur and atomic event e11 occurs, then complicated event is temporary overvoltage E11, is represented by
If atomic event e1 does not occur, atomic event e2 does not occur, atomic event e5 occurs, atomic event e6 occurs,
Atomic event e10 does not occur, atomic event e11 does not occur and atomic event e12 occurs, then complicated event is voltage dip E12,
It is represented by
If atomic event e1 does not occur, atomic event e2 does not occur, atomic event e5 occurs, atomic event e6 occurs,
Atomic event e10 does not occur, atomic event e11 does not occur and atomic event e12 does not occur, then complicated event is other events
E13, is represented by
Step 4：Determine complicated event pattern.
Complicated event pattern is determined, is for the ease of Complex event processing engine detection of complex event.The present embodiment is used
The language of logic-based describes atomic event, obtains event schema.The language of logic-based is specially EPL (Event
Processing Language).The complicated event obtained according to step 3, can write out following EPL event schemas expression formula：
String expression1=" Select item From pattern [every item=e1] ".
String expression2=" Select item1, item2, item3 From pattern [every (not
Item1=e1 and item2=e2 and not item3=e3)] ".
String expression3=" Select item1, item2, item3, item4 From pattern
[every (not item1=e1 and item2=e2 and item3=e3 and item4=e4)] ".
String expression4=" Select item1, item2, item3, item4 From pattern
[every (not item1=e1 and item2=e2 and item3=e3 and not item4=e4)] ".
4 embodiments are only provided above, and the description of other complicated events is similar.
Step 5：Using Complex event processing engine detection of complex event schema, the corresponding complexity of complicated event pattern is obtained
Event.
Complex event processing (CEP) engine is the system that can carry out Complex event processing, receives substantial amounts of from difference
These events are changed into the manageable form of internal system by event source event according to specified data model, new to these
Come event filtered, with reference to, aggregation etc. operation, generate complicated event, finally notice the corresponding complicated event of upper layer application
Whether occur.
Complex event processing engine is namely based on flow of event and carries out data processing, the data abstraction to be analyzed into event,
Then CEP engines are transmitted data to, input and the processing model of first registers that engine will be according to event are obtained at event
Manage result.
There is similar SQL statement inside CEP, it can be understood as the definition and description of processing model.This is to operate in CEP engines
In special sentence.Engine obtains event handling result according to the input of event and the processing model of first registers.
Step 6：According to complicated event and the mapping relations of classification output result, the classification output knot of complicated event is determined
Really.
By above-mentioned processing, obtained classification output result is the mark of complicated event, such as E1, E2.It is true by step 3
Fixed complicated event and the mapping relations of classification output result, can obtain complicated event according to classification output result.
The present invention can carry out effective classification to the type of electrical energy power quality disturbance event, and more rapidly, monitor goes out
Power Quality Disturbance.Meanwhile, the present invention has also combined complex event processing techniques, using parallel determination methods, significantly
The time that classification judges is saved, the Monitoring Data especially for magnanimity can more embody the characteristics of its is quick.In addition, this hair
It is bright that also there is stronger scalability.The transient power quality problem that the disturbance type new for having is added, can be transported in program
While row, therefore the disturbance classification mode of dynamic load newly, with stronger scalability and stronger applicability, can fit
For a variety of disturbance sorting algorithms.
The foregoing is only a preferred embodiment of the present invention, but protection scope of the present invention be not limited thereto,
Any one skilled in the art the invention discloses technical scope in, the change or replacement that can be readily occurred in,
It should all be included within the scope of the present invention.Therefore, protection scope of the present invention should be with scope of the claims
It is defined.
Claims (1)
1. a kind of electrical energy power quality disturbance event category monitoring method based on Complex event processing, it is characterized in that methods described bag
Include：
Step 1：Extract the characteristic value of primary signal and the characteristic value of extraction is screened；
Step 2：Atomic event is determined according to the characteristic value after screening；
Step 3：Complicated event is described using the combining form of atomic event；
Step 4：Determine complicated event pattern；
Step 5：Using Complex event processing engine detection of complex event schema, the corresponding complicated thing of complicated event pattern is obtained
Part；
Step 6：According to complicated event and the mapping relations of classification output result, the classification output result of complicated event is determined；
The primary signal is recorder data；
The characteristic value includes three-phase voltage percent harmonic distortion maximum, three-phase voltage percent harmonic distortion maxima and minima
Difference, tri-phase unbalance factor, the deviation of three-phase voltage virtual value, the deviation of three-phase voltage, three-phase starting voltage virtual value and three
Phase end voltage virtual value；
The characteristic value according to after screening determines that atomic event is specially：
Using first condition as atomic event e1, if the characteristic value after screening meets first condition, atomic event e1 occurs,
Otherwise, atomic event e1 does not occur；
The first condition is：Collection period is more than or equal to 8 cycles, three-phase voltage percent harmonic distortion maxima and minima
The maximum that maximum in difference is less than in 2% and three-phase voltage percent harmonic distortion maximum is more than 4%；
Using second condition as atomic event e2, if the characteristic value after screening meets second condition, atomic event e2 occurs,
Otherwise, atomic event e2 does not occur；
The second condition is：The maximum of the deviation of three-phase voltage virtual value is less than 10% and more than -10%；
Using third condition as atomic event e3, if the characteristic value after screening meets third condition, atomic event e3 occurs,
Otherwise, atomic event e3 does not occur；
The third condition is：The maximum of tri-phase unbalance factor is more than in 4% and three-phase voltage percent harmonic distortion maximum
Maximum is more than 4%；
Using fourth condition as atomic event e4, if the characteristic value after screening meets fourth condition, atomic event e4 occurs,
Otherwise, atomic event e4 does not occur；
The fourth condition is：The deviation of three-phase voltage virtual value is both greater than -3% and less than 7%；
Using fifth condition as atomic event e5, if the characteristic value after screening meets fifth condition, atomic event e5 occurs,
Otherwise, atomic event e5 does not occur；
The fifth condition is：Three-phase starting voltage virtual value is both greater than equal to 0.9 and less than or equal to 1.1；
Using Article 6 part as atomic event e6, if the characteristic value after screening meets Article 6 part, atomic event e6 occurs,
Otherwise, atomic event e6 does not occur；
The Article 6 part is：Three-phase end voltage virtual value is both greater than equal to 0.9 and less than or equal to 1.1；
Using Article 7 part as atomic event e7, if the characteristic value after screening meets Article 7 part, atomic event e7 occurs,
Otherwise, atomic event e7 does not occur；
The Article 7 part is：At least the minimum value of the deviation of a phase voltage is less than -90% in three-phase voltage；
Using Article 8 part as atomic event e8, if the characteristic value after screening meets Article 8 part, atomic event e8 occurs,
Otherwise, atomic event e8 does not occur；
The Article 8 part is：At least the minimum value of the deviation of a phase voltage is more than -90% in three-phase voltage；
Using Article 9 part as atomic event e9, if the characteristic value after screening meets Article 9 part, atomic event e9 occurs,
Otherwise, atomic event e9 does not occur；
The Article 9 part is：At least the maximum of the deviation of a phase voltage is more than+10% in three-phase voltage；
Using Article 10 part as atomic event e10, if the characteristic value after screening meets Article 10 part, atomic event e10 hairs
Raw, otherwise, atomic event e10 does not occur；
The Article 10 part is：The minimum value of the deviation of three-phase voltage is both greater than -90%；
Using Article 11 part as atomic event e11, if the characteristic value after screening meets Article 11 part, atomic event
E11 occurs, and otherwise, atomic event e11 does not occur；
The Article 11 part is：The maximum of the deviation of three-phase voltage is both greater than+10%；
Using Article 12 part as atomic event e12, if the characteristic value after screening meets Article 12 part, atomic event
E12 occurs, and otherwise, atomic event e12 does not occur；
The Article 12 part is：At least the minimum value of the deviation of a phase voltage is less than -90% in three-phase voltage；
The combining form of the use atomic event describes complicated event and is specially：
If atomic event e1 occurs, complicated event is wave distortion；
If atomic event e1 does not occur, atomic event e2 occurs and atomic event e3 does not occur, complicated event shakes for transition
Swing；
If atomic event e1 does not occur, atomic event e2 occurs, atomic event e3 occurs and atomic event e4 does not occur, multiple
Miscellaneous affair part is that voltage effective value transient state is out-of-limit；
If atomic event e1 does not occur, atomic event e2 occurs, atomic event e3 occurs and atomic event e4 occurs, complicated
Event is that the quality of power supply is normal；
If atomic event e1 does not occur, atomic event e2 does not occur and atomic event e5 does not occur, complicated event is starting
Voltage effective value is abnormal；
If atomic event e1 does not occur, atomic event e2 does not occur, atomic event e5 occurs and atomic event e6 does not occur,
Complicated event is that end voltage virtual value does not recover；
If atomic event e1 does not occur, atomic event e2 does not occur, atomic event e5 occurs, atomic event e6 occurs and atom
Event e10 occurs, then complicated event interrupts for short time voltage；
If atomic event e1 does not occur, atomic event e2 does not occur, atomic event e5 occurs, atomic event e6 occurs, atom
Event e10 does not occur and atomic event e11 occurs, then complicated event is temporary overvoltage；
If atomic event e1 does not occur, atomic event e2 does not occur, atomic event e5 occurs, atomic event e6 occurs, atom
Event e10 does not occur, atomic event e11 does not occur and atomic event e12 occurs, then complicated event is voltage dip.
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| CN106815774A (en) * | 2015-12-02 | 2017-06-09 | 中国电力科学研究院 | Substation operation monitoring signal method of standardization management based on CEP engines |
| CN108647626B (en) * | 2018-05-04 | 2021-11-02 | 广东电网有限责任公司广州供电局 | Method and device for determining incidence relation between power quality event and event cause |
| CN110889396A (en) * | 2019-12-12 | 2020-03-17 | 国家电网有限公司大数据中心 | Energy internet disturbance classification method and device, electronic equipment and storage medium |
| CN113641712B (en) * | 2021-08-20 | 2023-08-15 | 平安银行股份有限公司 | Hit processing method, device, equipment and storage medium for complex event |
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| CN201707407U (en) * | 2010-05-14 | 2011-01-12 | 山东齐林电科电力设备制造有限公司 | Electric energy quality online monitoring device |
| CN102445620A (en) * | 2011-11-21 | 2012-05-09 | 东北大学 | Transient power quality detection device and method for the same |
| CN102944773A (en) * | 2012-10-29 | 2013-02-27 | 华南理工大学 | Method for detecting and classifying power disturbances based on space conversion |
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| CN102445620A (en) * | 2011-11-21 | 2012-05-09 | 东北大学 | Transient power quality detection device and method for the same |
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