CN104022525A - Independent operation detection device and independent operation detection method - Google Patents
Independent operation detection device and independent operation detection method Download PDFInfo
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- CN104022525A CN104022525A CN201410059191.9A CN201410059191A CN104022525A CN 104022525 A CN104022525 A CN 104022525A CN 201410059191 A CN201410059191 A CN 201410059191A CN 104022525 A CN104022525 A CN 104022525A
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Abstract
The invention provides an independent operation detection device and an independent operation detection method which can detect independent operation in a more correct and rapid manner. The independent operation detection device (100) detects independent operation of a dispersed power supply which is in grid-connected operation with a commercial power system. The device specifically injects reactive power for the commercial power system, detects electric power change cycle of the commercial power system, stores the detected electric power change cycle, calculates average value of the past m times of electric power change cycles, predicts the next electric power change cycle according to the past n times of electric power change cycles, and calculates deviation of the average value of the predicted electric power change cycle and the calculated electric power change cycle. An active independent operation determination portion (165) compares the calculated deviation with preset threshold value, and if the deviation exceeds the threshold value, the dispersed power supply is determined to operate independently, and if the deviation does not exceed the threshold value, the dispersed power supply does not operate independently.
Description
Technical field
The present invention relates to independent operating checkout gear and the independent operating detection method of the independent operating that detects the decentralized power s being incorporated into the power networks with source power supply system.
Background technology
In recent years, use always and the electric power of the decentralized power s such as solar cell, fuel cell is connected with source power supply system and offers the supply unit of AC load.In order effectively the electric power of the electric power of decentralized power s and source power supply system to be offered to AC load, between decentralized power s and source power supply system, be connected with power governor.
Power governor is in the time utilizing solar cell and fuel cell, the electric power sending is converted to the device of the electric power that can use in commercialization.Power governor has following two kinds, a kind of is if generation power is larger than the required electric power of AC load, dump power is offered to source power supply system, contrary, if the generation power of decentralized power s is less than the required electric power of AC load, goes into business and receive not enough electric power by power-supply system; The second is the electric power that only compensates consumption, does not provide electric power to source power supply system.
Because power governor can be connected with source power supply system, the generation power of decentralized power s is offered to source power supply system, therefore, source power supply system because of accident or construction have a power failure time, if power governor cannot detect rapidly this power failure, can provide electric power from decentralized power s side direction source power supply system side.
Therefore, on power governor, be provided with in the time of source power supply system blackout, detect the independent operating checkout gear of decentralized power s independent operating.In existing independent operating checkout gear, for example, there is the device shown in following patent documentation 1.
The independent operating checkout gear of patent documentation 1 possesses active detecting function and two kinds of functions of passive detection function.Active detecting function is following function,, the additional such as frequency of the alternating electromotive force of present output, var variation or the electric power variation of gaining merit etc. is disturbed to key element that is, detects independent operating based on this additional interference key element.Passive detection function is following function, that is, and for example output current of various key elements of the alternating electromotive force based on present output and the key element of system voltage, the function of detection independent operating.
The independent operating checkout gear of patent documentation 1 during to independent operating, is judged as decentralized power s at least one Function detection by active detecting function or passive detection function in independent operating.
Prior art document
Patent documentation 1: No. 4073387 specification of patent
In existing independent operating checkout gear described above, whether exceed fiducial value and judge the independent operating of decentralized power s according to the frequency variation of the alternating electromotive force of present output.But the testing requirement of independent operating is correct as much as possible, but also require as far as possible promptly to carry out.But, in existing independent operating checkout gear as above, remain in these areas the space of improvement.
Summary of the invention
The object of the invention is to provide independent operating checkout gear and the independent operating detection method that can more correctly and promptly detect independent operating.
For realizing the independent operating checkout gear of above-mentioned purpose, the independent operating that detects the decentralized power s being incorporated into the power networks with source power supply system, it has: var injection unit, electric power variation cycle detection portion, electric power variation cycle storage part, average electric power period of change calculating part, electric power variation period forecasting portion, deviation calculating part and active independent operating judging part.
Var injection unit is injected var to source power supply system.The electric power variation cycle of source power supply system is detected by electric power variation cycle detection portion.The electric power variation cycle that electric power variation cycle storage portion stores detects.Average electric power period of change calculating part calculates the mean value in the electric power variation cycle of m time in past.Electric power variation period forecasting portion is according to the next electric power variation cycle of the past electric power variation period forecasting of n time.Deviation calculating part calculates the deviation of the mean value of the electric power variation cycle doping and the electric power variation cycle calculating.Active independent operating judging part is by the deviation calculating and predefined threshold, if deviation exceedes threshold value, being judged as decentralized power s is independent operating, if deviation does not exceed threshold value, being judged as decentralized power s is not independent operating.
In addition, for realizing the independent operating detection method of above-mentioned purpose, for detection of the independent operating of the decentralized power s being incorporated into the power networks with source power supply system, it comprises: var injects stage, electric power variation cycle detection stage, electric power variation cycle memory phase, average electric power period of change calculation stages, electric power variation period forecasting stage, deviation calculation stages and active independent operating and judges the stage.
Inject the stage at var, source power supply system is injected to var.In the electric power variation cycle detection stage, detect the electric power variation cycle of source power supply system.At electric power variation cycle memory phase, the electric power variation cycle that storage detects.In average electric power period of change calculation stages, calculate the mean value in the electric power variation cycle of m time in past.In the electric power variation period forecasting stage, according to the electric power variation period forecasting Next electric power variation cycle of n time in past.In deviation calculation stages, calculate the deviation of the mean value of the electric power variation cycle doping and the electric power variation cycle calculating.Judge the stage at active independent operating, by the deviation calculating and predefined threshold, if deviation exceedes threshold value, being judged as decentralized power s is independent operating, if deviation does not exceed threshold value, being judged as decentralized power s is not independent operating.
According to thering is as above independent operating checkout gear of the present invention and the independent operating detection method of structure, due to according to the next electric power variation cycle of the electric power variation period forecasting in past, and use the electric power variation cycle doping to judge the independent operating of decentralized power s, therefore, can more correctly and promptly detect the independent operating of decentralized power s.
Brief description of the drawings
Fig. 1 is the block diagram of the power governor that possesses independent operating checkout gear of the present invention;
Fig. 2 is the block diagram of the independent operating checkout gear of Fig. 1;
Fig. 3 is the operational flowchart of the var injection unit shown in Fig. 2, electric power variation cycle detection portion and electric power variation cycle storage part;
Fig. 4 is the operational flowchart of the average electric power period of change calculating part shown in Fig. 2, electric power variation period forecasting portion, deviation calculating part, deviation storage part and active independent operating judging part;
Fig. 5 is the subroutine flow chart of the holotype Check processing of Fig. 4;
Fig. 6 is the subroutine flow chart of the negative mode Check processing of Fig. 4;
Fig. 7 is the operational flowchart of average electric power period of change calculating part, electric power variation period forecasting portion, frequency change rate calculating part and the passive independent operating judging part shown in Fig. 2;
Fig. 8 is to provide the figure of the operating instruction of the active detecting function of the independent operating checkout gear of Fig. 1;
Fig. 9 is the figure that represents the holotype of threshold value storage part and the threshold value of negative mode that are stored in Fig. 1;
Figure 10 is to provide the figure of the operating instruction of the passive detection function of the independent operating checkout gear of Fig. 1.
Symbol description
10 power governors
12DC/DC transducer
14DC/AC inverter
16 connected relays
20 decentralized power ss
30 source power supply systems
100 independent operating checkout gears
110 var injection units
120 electric power variation cycle detection portions
130 electric power variation cycle storage parts
130 average electric power period of change calculating parts
140 electric power variation period forecasting portions
150 deviation calculating parts
155 threshold value storage parts
160 deviation storage parts
165 active independent operating judging parts
170 frequency change rate calculating parts
180 passive independent operating judging parts
Embodiment
Then, with reference to accompanying drawing, independent operating checkout gear of the present invention and independent operating detection method are at length described.
(structure of power governor)
Fig. 1 is the block diagram of the power governor that possesses independent operating checkout gear of the present invention.Independent operating checkout gear detects the independent operating of the decentralized power s being incorporated into the power networks with source power supply system.
Power governor 10 is connected with decentralized power s 20 and source power supply system 30.Decentralized power s 20 for example can provide the DC power supply of direct current power for solar panel, fuel cell etc.Source power supply system 30 is the 50Hz that is connected with power plant or the source power supply of 60Hz.Power governor 10 has following two kinds of functions, and one is independent operation function, and it will be converted to alternating electromotive force and provide alternating electromotive force to not shown load from the direct current power of decentralized power s 20; Another kind is the operation function that is connected, it will be converted to alternating electromotive force and the dump power of above-mentioned load be offered to source power supply system from the direct current power of decentralized power s 20, on the other hand, to be converted to alternating electromotive force and provide alternating electromotive force to load from the direct current power of decentralized power s 20, meanwhile, go into business the not enough electric power of load is provided by power-supply system.
Power governor 10 has: the DC/AC inverter 14 that promotes the DC/DC transducer 12 of the output voltage of decentralized power s 20 in order to bring into play independent operation function and connected operation function, is alternating voltage by the voltage transitions after boosting.DC/AC inverter 14 is connected with source power supply system 30 via connected relay 16.
Power governor 10 is according to the operation that is connected of the generating situation of decentralized power s 20, or carries out independent operating according to the power transmission situation of source power supply system 30.Power governor 10 has independent operating checkout gear 100, and it is the connected operation of identification and independent operating rapidly, makes relay 16 off-the-lines that are connected in the time independent operating being detected.For example, if there is the power failure causing because of construction in source power supply system 30, independent operating checkout gear 100 detects rapidly this power failure, independent operating checkout gear 100 makes relay 16 off-the-lines that are connected, cut off DC/AC inverter 14 and source power supply system 30, not provide electric power from decentralized power s 20 to source power supply system 30.
(structure of independent operating checkout gear)
Fig. 2 is the block diagram of the independent operating checkout gear of Fig. 1.Independent operating checkout gear 100 has: var injection unit 110, electric power variation cycle detection portion 120, electric power variation cycle storage part 125, average electric power period of change calculating part 130, electric power variation period forecasting portion 140, deviation calculating part 150, threshold value storage part 155, deviation storage part 160, active independent operating judging part 165, frequency change rate calculating part 170 and passive independent operating judging part 180.
Var injection unit 110, in order to detect rapidly the power failure of source power supply system 30, is injected var to source power supply system 30.The injection of var is used the technology conventionally adopting.
The voltage rising cycle of electric power variation cycle detection portion 120 separate detection source power supply systems 30 and decline cycle in these two cycles of its voltage, the electric power variation cycle of detection source power supply system 30.In this manual, detect the electric power variation cycle according to the change in voltage of source power supply system 30.The in the situation that of three-phase alternating current, can detect according to the change in voltage of the phase in three-phase, also can detect according to the change in voltage of two-phase.
The electric power variation cycle that electric power variation cycle storage part 125 store power period of change test sections 120 detect.The electric power variation cycle is stored respectively rising cycle of voltage of source power supply system 30 and the decline cycle of above-mentioned voltage according to time series.
Average electric power period of change calculating part 130 takes out m electric power variation cycle that is stored in electric power variation cycle storage part 125 according to time series, calculates the mean value in the electric power variation cycle of m time in past.Below by the detailed operation of the average electric power period of change calculating part 130 of narration.
Electric power variation period forecasting portion 140 takes out n electric power variation cycle that is stored in electric power variation cycle storage part 125 according to time series, the electric power variation cycle specific time in the electric power variation cycle of n time in past is weighted, calculate the mean value in n electric power variation cycle after weighting, predict thus the next electric power variation cycle.Below by the detailed operation of narration electric power variation period forecasting portion 140.
Deviation calculating part 150 calculates the deviation of the mean value in the electric power variation cycle that electric power variation cycle that electric power variation period forecasting portion 140 dopes and average electric power variation computation of Period portion 130 calculate.Below by the detailed operation of narration deviation calculating part 150.
Multiple threshold values corresponding to multiple deviations difference that 155 storages of threshold value storage part calculate with deviation calculating part 150.Threshold value storage part 155 will with multiple deviations respectively corresponding multiple threshold values as shown in Figure 9, when to be divided into deviation that deviation calculating part 150 calculates and to be the threshold value of the holotype that timing uses and deviation be negative, the threshold value of the negative mode of use is stored.The size of corresponding multiple threshold values is different respectively with multiple deviations, with regard to multiple deviations respectively with regard to the big or small absolute value of corresponding multiple threshold values, and the threshold value corresponding with the deviation of morning more, absolute value is less.In addition, threshold value storage part 155 is stored the threshold value (frequency change rate and number of times) of the frequency change rate for calculating by passive independent operating judging part 180 comparison frequency rate of change calculating parts 170.
Multiple deviations that deviation storage part 160 calculates according to time series storage deviation calculating part 150.
The deviation that active independent operating judging part 165 calculates deviation calculating part 150 compares with the predefined threshold value that is stored in threshold value storage part 155, if this deviation exceedes threshold value, being judged as decentralized power s 20 is independent operatings, if this deviation does not exceed threshold value, being judged as decentralized power s 20 is not independent operating.In addition, active independent operating judging part 165 by the multiple deviations that are stored in deviation storage part 160 according to time series be stored in threshold value storage part 155, distinguish corresponding multiple threshold with the plurality of deviation, if exceed the multiple threshold values corresponding with all the plurality of deviations difference, being judged as decentralized power s 20 is independent operatings, as long as if there is a deviation not exceed the threshold value corresponding with this deviation in the plurality of deviation, being judged as decentralized power s 20 is not independent operating.In addition, the deviation that active independent operating judging part 165 calculates at deviation calculating part 150 is timing, use is stored in the threshold value of the holotype of threshold value storage part 155, judge whether decentralized power s 20 is independent operating, when the deviation calculating at deviation calculating part 150 is negative, use is stored in the threshold value of the negative mode of threshold value storage part 155, judges whether decentralized power s 20 is independent operating.
The mean value in the electric power variation cycle that frequency change rate calculating part 170 calculates according to average electric power period of change calculating part 130 and the next electric power variation cycle that electric power variation period forecasting portion 140 predicts, calculated rate rate of change.In addition, in the electric power variation cycle that frequency change rate calculating part 170 uses electric power variation period forecasting portion 140 to predict, calculate the frequency change rate with respect to each electric power variation cycle.
If the frequency change rate calculating in the time of the next electric power variation cycle that calculating electric power variation period forecasting portion 140 dopes at every turn, repeatedly exceed continuously the threshold value that is stored in threshold value storage part 155, and the direction of frequency change is repeatedly identical, to be judged as decentralized power s 20 are independent operatings to passive independent operating judging part 180; If repeatedly do not exceed continuously threshold value at each frequency change rate calculating while calculating the next electric power variation cycle, if or the direction of frequency change repeatedly not identical, to be judged as decentralized power s 20 be not independent operating to passive independent operating judging part 180.In addition, passive independent operating judging part 180 uses the frequency change rate that the electric power variation cycle that electric power variation period forecasting portion 140 is doped calculates respectively, judges whether decentralized power s 20 is independent operatings.
(operation of independent operating checkout gear)
The schematic configuration of independent operating checkout gear 100 is described above.Then, with reference to Fig. 3～Fig. 8, the operation of independent operating checkout gear 100 is described.Below the operation of the independent operating checkout gear 100 of explanation is identical with the order of independent operating detection method of the present invention.
< active detecting function >
Fig. 3 is the operational flowchart of var injection unit 110, electric power variation cycle detection portion 120 and electric power variation cycle storage part 125.
Var injection unit 110 is injected var (step S100) to source power supply system 30.The injection of var is carried out in the steps below.First, try to achieve the moving average in the electric power variation cycle between the 80m second before, for example 200m that detect by electric power variation cycle detection portion 120 second and from now to the difference of the moving average in the electric power variation cycle 40m second as frequency departure.Then, the corresponding var injection rate of size of calculating and this frequency departure, for the electric power of gaining merit keeps fixing, changes current phase on one side, and the var injection rate calculating is injected to source power supply system 30 in one side.
Electric power variation cycle T a, the Tb(step S110 of source power supply system 30 detects in electric power variation cycle detection portion 120).Electric power variation cycle detection portion 120 as shown in Figure 8, detects from the voltage of the zero crossing from source power supply system 30 and rises to the electric power variation cycle as Ta system cycle of rising from the voltage of next zero crossing.And, detect the electric power variation cycle that to the cycle of the voltage drop from next zero crossing as Tb is from the voltage drop of the zero crossing from source power supply system 30., the electric power variation cycle of 120 separate detection Ta systems of electric power variation cycle detection portion and the electric power variation cycle of Tb system.
Electric power variation cycle storage part 125 is stored the Ta system detecting, the cycle (step S120) of Tb system.The electric power variation cycle of Ta system and the electric power variation cycle of Tb system that electric power variation cycle storage part 125 separates and detects according to time series store power period of change test section 120.
Fig. 4 is the operational flowchart of average electric power period of change calculating part 130, electric power variation period forecasting portion 140, deviation calculating part 150, deviation storage part 160 and active independent operating judging part 165.
Average electric power period of change calculating part 130 calculates the average period (step S200) that arrives m the electric power variation cycle before the set time.In the present embodiment, m is 7.Average electric power period of change calculating part 130 takes out respectively the electric power variation cycle of the Ta system that is stored in electric power variation cycle storage part 125 and the electric power variation cycle of Tb system.Particularly, as shown in Figure 8, for Ta system, take out the data, the Ta(N-10 that start the electric power variation cycle of 7 amounts from current time (being equivalent to the electric power variation cycle of 10 amounts under 50Hz) from 200m second), Ta(N-11) ..., Ta(N-15), Ta(N-16) these 7 electric power variation cycles.Meanwhile, for Tb system, take out Tb(N-10), Tb(N-11) ..., Tb(N-15), Tb(N-16) these 7 electric power variation cycles.
Then, average electric power period of change calculating part 130 to Ta system calculate Ta(N-10)+Ta(N-11)+... + Ta(N-15)+Ta(N-16)/7 and calculate the mean value Taave in the electric power variation cycle of Ta system.Meanwhile, average electric power period of change calculating part 130 to Tb system calculate Tb(N-10)+Tb(N-11)+... + Tb(N-15)+Tb(N-16)/7 and calculate the mean value Tbave in the electric power variation cycle of Tb system.In addition, in above-mentioned example, use 7 all electric power variation cycles to try to achieve the mean value in electric power variation cycle, but in order to improve reliability, also can remove minimum and maximum two the electric power variation cycles in 7, use remaining 5 electric power variation cycles to calculate the mean value in electric power variation cycle.
Electric power variation period forecasting portion 140 calculates predetermined period (step S210) according to n the electric power variation cycle more Zao than current time.In the present embodiment, n is 5.Electric power variation period forecasting portion 140 takes out respectively the electric power variation cycle of the Ta system that is stored in electric power variation cycle storage part 125 and the electric power variation cycle of Tb system.Particularly, as shown in Figure 8, for Ta system, take out the data, the Ta(N that start the electric power variation cycle of 5 amounts from current time), Ta(N-1), Ta(N-2), Ta(N-3), Ta(N-4) these 5 electric power variation cycles.Meanwhile, for Tb system, take out Tb(N), Tb(N-1), Tb(N-2), Tb(N-3), Tb(N-4) these 5 electric power variation cycles.
Then, electric power variation period forecasting portion 140 carries out following calculating, calculates predetermined period of electric power variation.Particularly,
Predetermined period Ta(N+1 of Ta system) by calculating
Predetermined period Ta(N+1)=Ta(N)+Ta(N)-Ta(N-1)+2 × Ta(N-1)-Ta(N-2)+2 × Ta(N-2)-Ta(N-3)+Ta(N-3)-Ta(N-4)/6
And calculate,
Predetermined period Tb(N+1 of Tb system) by calculating
Predetermined period Tb(N+1)=Tb(N)+Tb(N)-Tb(N-1)+2 × Tb(N-1)-Tb(N-2)+2 × Tb(N-2)-Tb(N-3)+Tb(N-3)-Tb(N-4)/6.
And calculate.
Above calculating by 4 formulas of imperial lattice-storehouse tower as a reference, is weighted the specific electric power variation cycle, by differential equation, according to the electric power variation cycle in electric power variation period forecasting future in past.
Deviation calculating part 150 calculates the deviation (step S220) of average period and predetermined period.
Particularly, for Ta system, the mean value in electric power variation cycle is Taave, and predetermined period is Ta(N+1), therefore, deviation diffTa(N) by calculating
DiffTa(N)=Taave-Ta(N+1) and calculate.
In addition, for Tb system, the mean value in electric power variation cycle is Tbave, and predetermined period is Tb(N+1), therefore, deviation diffTb(N) by calculating
DiffTb(N)=Tbave-Tb(N+1) and calculate.
Deviation diffTa(N) and deviation diffTb(N) value of plus or minus there is.
Deviation calculating part 150 makes the deviation diffTa(N trying to achieve in step S220) and deviation diffTb(N) be stored in deviation storage part 160(step S230 according to time series).
The deviation diffTa(N calculating in deviation calculating part 150 determining step S220) and deviation diffTb(N) be just or negative (step S240).
If deviation diffTa(N) and deviation diffTb(N) be just (step S240: be), the holotype Check processing of 165 execution step S250 of active independent operating judging part, bear if (step S240: no), perform step the negative mode Check processing of S260.In addition, at deviation diffTa(N) for just and deviation diffTb(N) when negative, to deviation diffTa(N) the holotype Check processing of execution step S250, to diffTb(N) the negative mode Check processing of execution step S260.At deviation diffTa(N) be negative and deviation diffTb(N) be timing, to deviation diffTa(N) the negative mode Check processing of execution step S260, to diffTb(N) the holotype Check processing of execution step S250.
Fig. 5 is the subroutine flow chart of the holotype Check processing of Fig. 4.In addition, Fig. 6 is the subroutine flow chart of the negative mode Check processing of Fig. 4.
At deviation diffTa(N) and deviation diffTb(N) be positive in the situation that, active independent operating judging part 165 takes out p the deviation more Zao than current time from deviation storage part 160, by the p of a taking-up deviation and the threshold (step S250-1) that is stored in threshold value storage part 155.In the present embodiment, p is 5.
Particularly, as shown in Figure 8, active independent operating judging part 165 takes out respectively diffTa(N from deviation storage part 160), diffTa(N-1), diffTa(N-2), diffTa(N-3), diffTa(N-4) as Ta system, take out diffTb(N), diffTb(N-1), diffTb(N-2), diffTb(N-3), diffTb(N-4) as Tb be.
Then, active independent operating judging part 165 takes out the threshold value Thp(N that is stored in holotype threshold value storage part 155, as shown in Figure 9), Thp(N-1), Thp(N-2), Thp(N-3), Thp(N-4), by them and the diffTa(N taking out from deviation storage part 160), diffTa(N-1), diffTa(N-2), diffTa(N-3), diffTa(N-4) and diffTb(N), diffTb(N-1), diffTb(N-2), diffTb(N-3), diffTb(N-4) compare.
Particularly, for Ta be, compare threshold Thp(N) and deviation diffTa(N) magnitude relationship, compare threshold Thp(N-1) and deviation diffTa(N-1) magnitude relationship, similarly, compare threshold Thp(N-2) and deviation diffTa(N-2), threshold value Thp(N-3) and deviation diffTa(N-3), threshold value Thp(N-4) and deviation diffTa(N-4).
In addition, for Tb be, compare threshold Thp(N) and deviation diffTb(N) magnitude relationship, compare threshold Thp(N-1) and deviation diffTb(N-1) magnitude relationship, similarly, compare threshold Thp(N-2) and deviation diffTb(N-2), threshold value Thp(N-3) and deviation diffTb(N-3), threshold value Thp(N-4) and deviation diffTb(N-4).
Actively independent operating judging part 165 judges, after relatively, whether all each deviations are than each self-corresponding threshold value large (step S250-2).
In the time that after relatively, all deviation ratio threshold values are large (step S250-2: be), active independent operating judging part 165 is judged as source power supply system 30 and has a power failure, decentralized power s 20 is independent operating, makes relay 16 off-the-lines that are connected, and cuts off source power supply system 30(step S250-3).On the other hand, after relatively, if as long as while having a deviation to be not more than threshold value in deviation (step S250-2: no), be judged as and be not independent operating, maintain the connection (step S250-4) of the relay 16 that is connected.
At deviation diffTa(N) and deviation diffTb(N) be negative in the situation that, active independent operating judging part 165 takes out p the deviation more Zao than current time from deviation storage part 160, by the p of a taking-up deviation and the threshold (step S260-1) that is stored in threshold value storage part 155.
Particularly, as shown in Figure 8, active independent operating judging part 165 takes out diffTa(N from deviation storage part 160 respectively), diffTa(N-1), diffTa(N-2), diffTa(N-3), diffTa(N-4) as Ta system, take out diffTb(N), diffTb(N-1), diffTb(N-2), diffTb(N-3), diffTb(N-4) as Tb be.
Then, active independent operating judging part 165 takes out the threshold value Thn(N that is stored in negative mode threshold value storage part 155, as shown in Figure 9), Thn(N-1), Thn(N-2), Thn(N-3), Thn(N-4), by them and the diffTa(N taking out from deviation storage part 160), diffTa(N-1), diffTa(N-2), diffTa(N-3), diffTa(N-4) and diffTb(N), diffTb(N-1), diffTb(N-2), diffTb(N-3), diffTb(N-4) compare.
Particularly, for Ta be, compare threshold Thn(N) and deviation diffTa(N) magnitude relationship, compare threshold Thn(N-1) and deviation diffTa(N-1) magnitude relationship, similarly, compare threshold Thn(N-2) and deviation diffTa(N-2), threshold value Thn(N-3) and deviation diffTa(N-3), threshold value Thn(N-4) and deviation diffTa(N-4).
In addition, for Tb be, compare threshold Thn(N) and deviation diffTb(N) magnitude relationship, compare threshold Thn(N-1) and deviation diffTb(N-1) magnitude relationship, similarly, compare threshold Thn(N-2) and deviation diffTb(N-2), threshold value Thn(N-3) and deviation diffTb(N-3), threshold value Thn(N-4) and deviation diffTb(N-4).
All each deviations after active independent operating judging part 165 judges relatively whether than with each self-corresponding threshold value little (step S260-2).
After relatively, if all deviation ratio threshold values hour (step S260-2: be), active independent operating judging part 165 is judged as source power supply system 30 and has a power failure, and decentralized power s 20 is independent operating, makes relay 16 off-the-lines that are connected, and cuts off source power supply system 30.In addition, blocking-up DC/AC inverter 14(is with reference to Fig. 1) gate circuit (ゲ ー ト)., do not give the gate circuit switching signal (step S260-3) of inverter 14.On the other hand, after relatively, if as long as while having a deviation to be not less than threshold value in deviation (step S260-2: no), be judged as and be not independent operating, maintain the connection of the relay 16 that is connected.In addition, do not block DC/AC inverter 14(with reference to Fig. 1) gate circuit, make its switch that does as usual (step S260-4).
Like this, in active detecting function, forcibly inject var to source power supply system 30, waving of the change in voltage of the source power supply causing according to the injection of var, detects the power failure of source power supply system 30, detects the independent operating of decentralized power s 20.
< passive detection function >
Fig. 7 is the operational flowchart of average electric power period of change calculating part 130, electric power variation period forecasting portion 140, frequency change rate calculating part 170 and passive independent operating judging part 180.
Average electric power period of change calculating part 130 calculates the average period (step S300) in q the electric power variation cycle more Zao than current time.In the present embodiment, q is 25.Average electric power period of change calculating part 130 takes out respectively the electric power variation cycle of the Ta system that is stored in electric power variation cycle storage part 125 and the electric power variation cycle of Tb system.Particularly, as shown in figure 10, for Ta system, take out the data, the Ta(N that start the electric power variation cycle of 25 amounts from current time), Ta(N-1) ..., Ta(N-23), Ta(N-24) 25 electric power variation cycles.Meanwhile, for Tb system, take out Tb(N), Tb(N-1) ..., Tb(N-23), Tb(N-24) 25 electric power variation cycles.
Then, on average electric power period of change calculating part 130 for Ta is, calculate Ta(N)+Ta(N-1)+... + Ta(N-23)+Ta(N-24)/25 and calculate the mean value Taave in the electric power variation cycle of Ta system.Meanwhile, on average electric power period of change calculating part 130 for Tb is, calculate Tb(N)+Tb(N-1)+... + Tb(N-23)+Tb(N-24)/25 and calculate the mean value Tbave in the electric power variation cycle of Tb system.
Electric power variation period forecasting portion 140, according to q the electric power variation cycle more Zao than current time, calculates predetermined period (step S310).The calculating of predetermined period is the quantity difference in electric power variation cycle, in addition, identical with the step S210 of Fig. 4.
Frequency change rate calculating part 170 is according to average period and predetermined period calculated rate rate of change (step S320).Frequency change rate is tried to achieve respectively Ta system and Tb system.The frequency change rate A of Ta system is by calculating A=(average period-predetermined period) calculate/average period.The frequency change rate B of Tb system also calculates by same calculating.
Frequency change rate A, the frequency change rate B of Ta that passive independent operating judging part 180 calculates frequency change rate calculating part 170 system and Tb system respectively with the threshold (step S330) that is stored in threshold value storage part 155.Threshold value storage part 155 stores 0.2%, 0.3%, 0.4%, 0.5% so multiple threshold values.Threshold value more used is selected by selector switch.In the present embodiment, select 0.3%.Therefore, relatively whether frequency change rate A, the frequency change rate B of Ta system and Tb system be larger than 0.3% respectively.
Passive independent operating judging part 180 all than 0.3% when large (step S330: be) of threshold value, enters the processing of next step at frequency change rate A, frequency change rate B.Frequency change rate refers to that greatly the possibility that source power supply system 30 has a power failure is large.On the other hand, unlike 0.3% when large (step S330: no) of threshold value, be judged as and be not independent operating, do not block DC/AC inverter 14(with reference to Fig. 1) gate circuit, make its switch that does as usual (step S360).
At frequency change rate A, frequency change rate B during all than 0.3% large (step S330: be) of threshold value, in the identical situation of the change direction (positive and negative symbol) of passive independent operating judging part 180 determination frequency rate of change A, frequency change rate B, whether reach the read-around ratio r(step S340 that is stored in threshold value storage part 155).At frequency change rate A, the frequency change rate B of identical change direction that exceedes threshold value continuously and while continuing r time (S340: be), being judged as source power supply system 30 has a power failure, decentralized power s 20 carries out independent operating, makes relay 16 off-the-lines that are connected, and cuts off source power supply system 30.In addition, blocking-up DC/AC inverter 14(is with reference to Fig. 1) gate circuit.The gate circuit that, does not give inverter 14 is with switching signal (step S350).On the other hand,, be judged as and be not independent operating not continuously r time time at frequency change rate A, the frequency change rate B of identical change direction that exceedes threshold value, maintain the connection of connected relay 16.In addition, do not block DC/AC inverter 14(with reference to Fig. 1) gate circuit, make its switch that does as usual (step S360).Confirm that it is because remove noise, to be judged as independent operating accurately that the frequency change rate that exceedes threshold value exceedes fixed number of times.Just set its number of times when more, the detection timing of independent operating can postpone.Therefore the number of times that, is stored in threshold value storage part 155 is set as meeting the number of times of the speed of the reliability that detects and detection.
As mentioned above, in order to carry out the detection of independent operating, measure the frequency of source power supply system and detect the variation of frequency in the short time.So far, the mean value in the past that comparison frequency changes and up-to-date mean value, determination frequency is tending towards increasing or is tending towards reducing, and is judged as independent operating in the time being tending towards increase or being tending towards reducing.But in above-mentioned the present invention, following frequency change after the mean value in the past changing by comparison frequency and a circulation, judges independent operating.Therefore, shorten the detection time of independent operating.In addition, owing to being by the deviation of frequency and threshold are detected to independent operating, therefore the accuracy of detection of independent operating improves.In addition, owing to using active detecting function and two kinds of Function detection independent operatings of passive detection function, therefore, can carry out reliably the detection of independent operating.
Claims (12)
1. an independent operating checkout gear, the independent operating that it detects the decentralized power s being incorporated into the power networks with source power supply system, is characterized in that having:
Var injection unit, it injects var to described source power supply system;
Electric power variation cycle detection portion, it detects the electric power variation cycle of described source power supply system;
Electric power variation cycle storage part, the electric power variation cycle that its storage detects;
Average electric power period of change calculating part, it calculates the mean value in the electric power variation cycle of m time in past;
Electric power variation period forecasting portion, it is according to the next electric power variation cycle of the past electric power variation period forecasting of n time;
Deviation calculating part, the deviation of the mean value in the electric power variation cycle that its calculating dopes and the electric power variation cycle calculating;
Active independent operating judging part, it is by the deviation calculating and predefined threshold, if described deviation exceedes described threshold value, being judged as described decentralized power s is independent operating, if described deviation does not exceed described threshold value, be judged as and be not independent operating.
2. independent operating checkout gear as claimed in claim 1, is characterized in that also possessing:
Deviation storage part, it stores according to time series multiple deviations that described deviation calculating part calculates;
Threshold value storage part, multiple threshold values that its storage is corresponding with described multiple deviations difference;
Wherein, described active independent operating judging part will be distinguished corresponding multiple threshold according to multiple deviations of time series storage with described multiple deviations, if all described multiple deviations all exceed corresponding respectively multiple threshold values, being judged as described decentralized power s is independent operating, as long as if there is a deviation not exceed the threshold value corresponding with this deviation in described multiple deviation, is judged as and is not independent operating.
3. independent operating checkout gear as claimed in claim 2, it is characterized in that, described threshold value storage part will be stored with described multiple deviations threshold value that corresponding multiple threshold values are divided into the negative mode using when threshold value that deviation that described deviation calculating part calculates is the holotype that uses of timing and described deviation are negative respectively
The deviation that described active independent operating judging part calculates at described deviation calculating part is timing, uses whether the threshold decision of holotype is independent operating, when negative, uses whether the threshold decision of negative mode is independent operating in the deviation calculating.
4. independent operating checkout gear as claimed in claim 2 or claim 3, is characterized in that, the size of corresponding multiple threshold values is different respectively with described multiple deviations.
5. independent operating checkout gear as claimed in claim 4, is characterized in that, in multiple threshold values corresponding with described multiple deviations difference, the big or small absolute value of the threshold value corresponding with the deviation of more passing by is less.
6. independent operating checkout gear as claimed in claim 1 or 2, it is characterized in that, described electric power variation period forecasting portion was weighted electric power variation cycle of specific time in the electric power variation cycle of n time in past, by calculating the mean value in n electric power variation cycle after weighting, predict the next electric power variation cycle.
7. independent operating checkout gear as claimed in claim 1 or 2, is characterized in that also having:
Frequency change rate calculating part, the next electric power variation cycle calculated rate rate of change that the mean value in its electric power variation cycle calculating according to described average electric power period of change calculating part and described electric power variation period forecasting portion dope;
Passive independent operating judging part, if the frequency change rate calculating while calculating the next electric power variation cycle repeatedly exceedes threshold value continuously at every turn, and the direction of frequency change is repeatedly identical, being judged as described decentralized power s is independent operating, if repeatedly do not exceed continuously threshold value, or the direction difference of frequency change repeatedly, be judged as and be not independent operating.
8. independent operating checkout gear as claimed in claim 1 or 2, is characterized in that, described electric power variation cycle detection part is turned up the soil and detected the rising cycle of described source power supply system voltage and two cycles of the decline cycle of described voltage.
9. independent operating checkout gear as claimed in claim 8, is characterized in that, described electric power variation cycle storage part is stored respectively the rising cycle of described source power supply system voltage and the decline cycle of described voltage according to time series.
10. independent operating checkout gear as claimed in claim 9, it is characterized in that, described average electric power period of change calculating part, described electric power variation period forecasting portion and described deviation calculating part use according to the rising cycle of described source power supply system voltage and described voltage decline cycle two cycle separate detection two electric power variation cycles, calculate the mean value with respect to the electric power variation cycle in each electric power variation cycle, the predicted value in next electric power variation cycle, the deviation of the mean value in electric power variation cycle, described active independent operating judging part uses the deviation that two electric power variation cycles are calculated respectively to determine whether independent operating.
11. independent operating checkout gears as claimed in claim 10, it is characterized in that, described frequency change rate calculating part uses described two electric power variation cycles, calculate the frequency change rate with respect to each electric power variation cycle, described passive independent operating judging part uses the frequency change rate that two electric power variation cycles are calculated respectively to determine whether independent operating.
12. 1 kinds of independent operating detection methods, it,, for detection of the independent operating of the decentralized power s being incorporated into the power networks with source power supply system, is characterized in that, it comprises:
Var injects the stage, and it injects var to described source power supply system;
In the electric power variation cycle detection stage, it detects the electric power variation cycle of described source power supply system;
Electric power variation cycle memory phase, the electric power variation cycle that its storage detects;
Power cycle on average calculates the stage, and it calculates the mean value in the electric power variation cycle of m time in past,
In the electric power variation period forecasting stage, it is according to the next electric power variation cycle of the past electric power variation period forecasting of n time;
Deviation calculates the stage, the deviation of the mean value in the electric power variation cycle that its calculating dopes and the electric power variation cycle calculating;
Independent operating judges the stage, and it is by the deviation calculating and predefined threshold, if described deviation exceedes described threshold value, being judged as described decentralized power s is independent operating, if described deviation does not exceed described threshold value, is judged as and is not independent operating.
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| Application Number | Priority Date | Filing Date | Title |
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| JP2013-039241 | 2013-02-28 | ||
| JP2013039241A JP6047425B2 (en) | 2013-02-28 | 2013-02-28 | Isolated operation detection device and isolated operation detection method |
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| CN104022525A true CN104022525A (en) | 2014-09-03 |
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| CN201410059191.9A Pending CN104022525A (en) | 2013-02-28 | 2014-02-21 | Independent operation detection device and independent operation detection method |
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| JP (1) | JP6047425B2 (en) |
| CN (1) | CN104022525A (en) |
| PH (1) | PH12014000071A1 (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109643898A (en) * | 2017-03-10 | 2019-04-16 | 富士电机株式会社 | Detection device, electric governor, detection method and detection program |
| CN112019015A (en) * | 2019-05-31 | 2020-12-01 | 广东美的制冷设备有限公司 | Drive control method, device, household appliance and computer readable storage medium |
Families Citing this family (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP6421512B2 (en) * | 2014-09-19 | 2018-11-14 | 株式会社デンソー | Power converter |
| CN104655895A (en) * | 2014-12-01 | 2015-05-27 | 国网上海市电力公司 | Micro-current inquiry power supply energy-saving protection system for watt-hour meter |
| JP6421981B2 (en) * | 2015-03-10 | 2018-11-14 | パナソニックＩｐマネジメント株式会社 | Isolated operation detection device and detection method |
| KR102577911B1 (en) | 2018-11-16 | 2023-09-14 | 상라오 징코 솔라 테크놀러지 디벨롭먼트 컴퍼니, 리미티드 | Power converting apparatus, photovoltaic module, and photovoltaic system including the same |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| JP4552913B2 (en) * | 2006-08-22 | 2010-09-29 | オムロン株式会社 | Isolated operation detection device |
| JP4645735B2 (en) * | 2008-12-15 | 2011-03-09 | オムロン株式会社 | Isolated operation detection method, isolated operation detection device, and program |
-
2013
- 2013-02-28 JP JP2013039241A patent/JP6047425B2/en active Active
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- 2014-02-21 CN CN201410059191.9A patent/CN104022525A/en active Pending
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109643898A (en) * | 2017-03-10 | 2019-04-16 | 富士电机株式会社 | Detection device, electric governor, detection method and detection program |
| CN109643898B (en) * | 2017-03-10 | 2022-07-26 | 富士电机株式会社 | Detection device, power conditioner, detection method, and computer-readable medium |
| CN112019015A (en) * | 2019-05-31 | 2020-12-01 | 广东美的制冷设备有限公司 | Drive control method, device, household appliance and computer readable storage medium |
Also Published As
| Publication number | Publication date |
|---|---|
| PH12014000071B1 (en) | 2015-10-12 |
| JP6047425B2 (en) | 2016-12-21 |
| PH12014000071A1 (en) | 2015-10-12 |
| JP2014168338A (en) | 2014-09-11 |
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Application publication date: 20140903 |