CN103730914B - The anti-islanding device differentiated based on electric parameters and method of work thereof - Google Patents
The anti-islanding device differentiated based on electric parameters and method of work thereof Download PDFInfo
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Abstract
The invention provides a kind of anti-islanding device differentiated based on electric parameters, comprise motherboard module, secondary voltage current acquisition modular converter, intake signal acquisition module, control treatment module, the amount of outputing driver module, alarm signal output module, display module and power module; Electric current and voltage Collect conversion module, intake signal acquisition module, the amount of outputing driver module, alarm signal output module and display module are electrically connected with control treatment module by signal respectively; Control treatment module comprises AD conversion chip, fpga chip, CPU and fiber optic data communication interface.The present invention can reliably sentence rapidly island phenomenon and realize disconnecting small distributed power supply fast, thus effectively ensures the safety of maintainer and relevant device; Frequency difference method of energy integral is adopted to solve the check frequency when systems exchange power is lighter of existing passive type detection method existence; Structure is simple, and cost is lower, applicability is strong.
Description
Technical field
The present invention relates to a kind of anti-islanding device based on electric parameters, belong to technical field of electric power.
Background technology
Island effect is the distinctive phenomenon of grid-connected system.Island effect refers in distributed generation system, when mains supply because fault, accident or have a power failure maintenance and after tripping, the distributed grid-connected electricity generation system of each user side fails detect power down mode in time thus self is cut off electricity network, the final isolated island electricity generation system forming the self-energizing be made up of distributed power station grid-connected system and its connected load.Island effect comprises two kinds: plan isolated island and unplanned isolated island.Plan isolated island causes power failure during at electric network fault or maintenance, in a planned way there is island effect, continue load supplying towards periphery by distributed power generation unit, thus reduce the loss brought because of power failure, improve power supply quality and reliability.And the power supply state of unplanned isolated island is unknown, a series of adverse effect and potential safety hazard can be caused, comprise: (1) island effect make voltage and frequency out of hand, will there is larger fluctuation in the voltage in islanded system and frequency, thus cause damage to electrical network and subscriber equipment; (2) when islanded system is accessed electrical network again, because the distributed power generation unit in system during reclosing may be asynchronous and make electric circuit breaker apparatus be damaged with electrical network, and very high impulse current may be produced, thus the distributed power generation unit in infringement islanded system, even cause electrical network to reappear tripping operation; (3) island effect may can not be removed by causing trouble, thus causes the infringement of grid equipment, and disturbs the automatic or manual of electrical network normal power supply system to recover; (4) the island effect circuit that makes some be considered to disconnect with all power supplys is charged, and this can bring the danger of electric shock to related personnel.
At present, distributed power source increases increasingly, and especially the development of distributed solar energy electricity generation system is very rapid.When there being many photovoltaic parallel in system to power to public electric wire net simultaneously, the probability that island effect occurs also increases thereupon.Therefore solve islanding problem and seem particularly important, effective method should be sought to prevent the generation of island effect, i.e. anti-islanding technology.Current anti-islanding technology mainly contains passive detection method and active detecting method.Common passive detection method mainly gathers local electrical quantities, and by high-frequency/low-frequency, the electric parameters criterions such as overvoltage/low pressure determine whether tripping operation, and its weak point is to exist very large check frequency, easily undetected.Active detection method produces disturbance by the inverter side at photovoltaic plant; then the electric parameters (as frequency) when whether having disturbance or utilize the rapid accumulation off-grid of positive feedback is detected in grid side; thus take anti-islanding protection action, but the quality of power supply that photovoltaic plant so must be made to send cannot be guaranteed.
Summary of the invention
The object of the invention is: overcome the deficiencies in the prior art, there is provided that a kind of structure is simple, applicability is strong, without the anti-islanding device differentiated based on electric parameters of check frequency, and this device judges island phenomenon generation and the method for work of corresponding quick disconnection small distributed power supply.
Technical scheme of the present invention is: the anti-islanding device differentiated based on electric parameters of the present invention, and its design feature is: comprise motherboard module, secondary voltage current acquisition modular converter, intake signal acquisition module, control treatment module, the amount of outputing driver module, alarm signal output module, display module and power module;
Above-mentioned secondary voltage current acquisition modular converter, intake signal acquisition module, control treatment module, the amount of outputing driver module and alarm signal output module are all arranged in motherboard module;
Motherboard module is provided with IO bus; Secondary voltage current acquisition modular converter, intake signal acquisition module, the amount of outputing driver module and alarm signal output module are equipped with signal input part, signal output part and power end; Control treatment module is provided with secondary voltage current signal input, intake signal input part, the amount of outputing drive singal output, alarm signal output ends, display output and power end; Display module is provided with signal input part and power end; Power module is provided with power output end;
The signal output part of above-mentioned secondary voltage current acquisition modular converter is electrically connected with the secondary voltage current signal input two-way signaling of control treatment module by the IO bus of motherboard module; The signal output part of intake signal acquisition module is electrically connected with the intake signal input part two-way signaling of control treatment module by the IO bus of motherboard module; The signal input part of the amount of outputing driver module is electrically connected with the amount of the outputing drive singal output end signal of control treatment module by the IO bus of motherboard module; The signal input part of alarm signal output module is electrically connected with the alarm signal output ends signal of control treatment module by the IO bus of motherboard module; The signal input part of display module is electrically connected with the display output end signal of control treatment module; The power end of the power end of the power end of secondary voltage current acquisition modular converter, the power end of intake signal acquisition module, control treatment module, the power end of the amount of outputing driver module, the power end of alarm signal output module and display module is all electrically connected with the power output end of power module;
Above-mentioned control treatment module comprises AD conversion chip, fpga chip, CPU and fiber optic data communication interface; Fpga chip, CPU are electrically connected with AD conversion chip two-way signaling respectively; Fpga chip, fiber optic data communication interface are electrically connected with CPU two-way signaling respectively; AD conversion chip is provided with signal input part; Fpga chip is provided with synchronizing clock signals input; The signal input part of AD conversion chip is the secondary voltage current signal input of above-mentioned control treatment module; The intake signal input part of above-mentioned control treatment module, the amount of outputing drive singal output, alarm signal output ends and display output are formed by the IO port of CPU.
Further scheme is: the fpga chip of above-mentioned control treatment module is technical grade fpga chip; CPU is the CPU of 32 bit strip flating point registers, and CPU has extended out 32MBNORFLASH, 256MBNANDFLASH and 64MBSDRAM.
Further scheme is: above-mentioned display module is the display adopting resistance-capacitance type touch-screen and the wide temperature liquid crystal display screen of technical grade.
The above-mentioned anti-islanding device differentiated based on electric parameters, it adopts the anti-islanding device differentiated based on electric parameters that 2 are above-mentioned, is called device 1 and device 2 in use; The public network transformer station outgoing line side that device 1 need monitored is arranged; Device 2 is arranged at the distributed power source outgoing line side that need monitor; Device 1 and device 2 are communicated to connect by Networks of Fiber Communications; Its method of work mainly comprises the following steps:
1. electric parameters collection: device 1 gathers voltage, the current signal of transformer station's outgoing line side; The fpga chip of the control treatment module of device 2 receives voltage, current signal that synchronizing clock signals controls its AD conversion chip synchronous acquisition distributed power source outgoing line side; Device 1 and the respective secondary voltage current acquisition modular converter of device 2 will be transferred to respective control treatment module respectively after the signal transacting of collection;
2. both sides voltage, current signal frequency difference multilevel iudge is calculated: device 1 and device 2 calculate voltage, the current signal frequency of respective side respectively; The frequency values that the frequency values himself calculated and the control treatment module of the device 2 called calculate compares and draws frequency-splitting Df by the control treatment module of device 1; Judgment threshold Ds built-in for the CPU of the control treatment module of this frequency-splitting Df and device 1 compares by the control treatment module of device 1: if Df >=Ds, then enter step 3.; If Df < is Ds, then enter step 4.;
3. calculate electric parameters each relevant parameter, the criterion according to setting determines whether to trip: the fpga chip of device 1 and the respective control treatment module of device 2 controls AD conversion chip synchronized sampling and completes DFT transformation calculations; The cpu cycle property of control treatment module reads result and the original sample value of DFT recursive operation from FPGA, after generating positive sequence, negative phase-sequence, zero-sequence component, utilizes following criterion to judge the tripping operation of whether breaking down of public network substation line simultaneously:
Criterion 1, Sudden Changing Rate starts:
or
; In formula,
for current flow sampled value,
for current sampling data before the T moment,
for current sampling data before the 2T moment;
for current power,
be the power before 0.2 second;
for jump-value of current starts threshold,
for chugging amount starts threshold;
Criterion 2, before accident, active power should be more than or equal to setting threshold:
; In formula, P
set2for the setting threshold of setting;
be the power before 0.2 second;
Criterion 3, after accident, active power should be less than setting threshold: P
t<P
s2; In formula, P
tfor active-power P after accident
s2for setting threshold;
Criterion 4, tripping operation after-current is less than the current settings threshold value that puts into operation:
, in formula, I
set1for the current ration that puts into operation;
for current flow amplitude;
Criterion 5, current amplitude variable quantity is greater than setting threshold:
; In formula, I
set2for setting threshold;
for current flow amplitude;
it is current amplitude before 20 milliseconds;
Criterion 6, meeting criterion 1 to criterion 5 time used is greater than delay adjustments threshold value:
; In formula, t
s1for delay adjustments threshold value, t is the time starting after criterion 1 to criterion 5 all meets to calculate;
If when meeting above-mentioned criterion 1 to criterion 6 simultaneously, enter step 5.; Otherwise return step 1.;
4. the frequency departure of control treatment module to the electric parameters of public network transformer station outgoing line side and distributed power source outgoing line side of device 1 carries out integral operation by following formula:
; In formula, Df is both sides frequency-splitting; If the value of result of calculation Kdf is greater than the frequency difference energy integral setting threshold established in the CPU module 3 of device 1, enter step 5.; Otherwise return step 1.;
5. the control treatment module of device 1 sends trip signal to the control treatment module of device 2; The control treatment module of device 2 controls by its amount of outputing driver module the power supply cutting off distributed power source; The alarm signal output module of device 1 and device 2 sends alarm signal simultaneously; The display module of device 1 and device 2 is to corresponding information simultaneous display.
The present invention has positive effect: (1) anti-islanding device differentiated based on electric parameters of the present invention, structure is simple, cost is lower, field connection is convenient, applicability is strong.(2) the anti-islanding device differentiated based on electric parameters of the present invention, adopt the electric parameters fault trip criterion based on the outlet of public network side transformer station, can reliably sentence rapidly island phenomenon and disconnect small distributed power supply fast, thus effectively ensure the safety of maintainer and relevant device.(3) the anti-islanding device differentiated based on electric parameters of the present invention, by gathering the electric parameters of public network side transformer station and distributed power source both sides, adopt the frequency difference method of energy integral based on both sides, effectively can eliminate the check frequency when systems exchange power is lighter that in prior art, passive type detection method exists.
Accompanying drawing explanation
Fig. 1 is electrical block diagram of the present invention;
Fig. 2 is the electrical connection schematic diagram of a kind of application examples of the present invention;
Fig. 3 is the flow chart of method of work of the present invention.
Reference numeral in above-mentioned accompanying drawing is as follows:
Motherboard module 1, secondary voltage current acquisition modular converter 2, intake signal acquisition module 3,
Control treatment module 4, fpga chip 41, AD conversion chip 42, CPU43, fiber optic data communication interface 44,
The amount of outputing driver module 5, alarm signal output module 6, display module 7, power module 8.
Embodiment
Below in conjunction with the drawings and specific embodiments and application examples, the present invention is further detailed explanation.
(embodiment 1)
See Fig. 1, the anti-islanding device differentiated based on electric parameters of the present embodiment, forms primarily of motherboard module 1, secondary voltage current acquisition modular converter 2, intake signal acquisition module 3, control treatment module 4, the amount of outputing driver module 5, alarm signal output module 6, display module 7 and power module 8.
Secondary voltage current acquisition modular converter 2, intake signal acquisition module 3, control treatment module 4, the amount of outputing driver module 5 and alarm signal output module 6 are all arranged in motherboard module 1.
Motherboard module 1 is provided with IO bus; Secondary voltage current acquisition modular converter 2, intake signal acquisition module 3, the amount of outputing driver module 5 and alarm signal output module 6 are equipped with signal input part, signal output part and power end; Control treatment module 4 is provided with secondary voltage current signal input, intake signal input part, the amount of outputing drive singal output, alarm signal output ends, display output and power end; Display module 7 is provided with signal input part and power end; Power module 8 is provided with power output end;
The signal output part of secondary voltage current acquisition modular converter 2 is electrically connected with the secondary voltage current signal input two-way signaling of control treatment module 4 by the IO bus of motherboard module 1; The signal output part of intake signal acquisition module 3 is electrically connected with the intake signal input part two-way signaling of control treatment module 4 by the IO bus of motherboard module 1; The signal input part of the amount of outputing driver module 5 is electrically connected with the amount of the outputing drive singal output end signal of control treatment module 4 by the IO bus of motherboard module 1; The signal input part of alarm signal output module 6 is electrically connected with the alarm signal output ends signal of control treatment module 4 by the IO bus of motherboard module 1; The signal input part of display module 7 is electrically connected with the display output end signal of control treatment module 4; The power end of the power end of the power end of secondary voltage current acquisition modular converter 2, the power end of intake signal acquisition module 3, control treatment module 4, the power end of the amount of outputing driver module 5, the power end of alarm signal output module 6 and display module 7 is all electrically connected with the power output end of power module 8;
Control treatment module 4 comprises AD conversion chip 41, fpga chip 42, CPU43 and fiber optic data communication interface 44; Fpga chip 42, CPU43 are electrically connected with AD conversion chip 41 two-way signaling respectively; Fpga chip 42, fiber optic data communication interface 44 are electrically connected with CPU43 two-way signaling respectively; AD conversion chip 41 is provided with signal input part; Fpga chip 42 is provided with synchronizing clock signals input; The signal input part of AD conversion chip 41 is the secondary voltage current signal input of described control treatment module 4; The intake signal input part of described control treatment module 4, the amount of outputing drive singal output, alarm signal output ends and display output are formed by the IO port of CPU43.
Aforesaid secondary voltage current acquisition modular converter 2 comprises protected level light current instrument transformer (PT/CT) and low pass filter, for realizing the conversion of strong/weak electric signal.During use, be converted into after the secondary voltage (being rated for 100V line voltage) of access and the light current instrument transformer of electric current (being rated for 1A or 5A) by secondary voltage current acquisition modular converter 2 that A/D chip can measure ± 5V signal, after the low-pass filtering of low pass filter, signal is exported.
Intake signal acquisition module 3 for gathering the intake signal such as isolation switch position, circuit breaker node, and by the signal that gathers through the IO bus transfer of motherboard module 1 to control treatment module 4.
The fpga chip 42 of control treatment module 4 is technical grade fpga chip; CPU43 is the CPU of 32 bit strip flating point registers, and CPU43 has extended out 32MBNORFLASH, 256MBNANDFLASH and 64MBSDRAM, can meet the sampling request of 1024, the every cycle of power frequency component.Fpga chip 42 connects B code time signal and the 1PPS pps pulse per second signal access fpga chip 44 of external perimysium reference clock (as GPS/ big-dipper satellite standard synchronisation clock) when using, the sampling pulse of fpga chip 42 is synchronized with 1PPS signal, and after each sampled point completes, stamp the temporal information being accurate to ns, fpga chip 42 Synchronization Control AD conversion chip 41 is to realize the synchronized sampling of the whole network and calculating and by information transmission to CPU43; CPU43 receives the electric parameters that fpga chip 42 synchronous acquisition arrives, and utilizes built-in program and criterion to process.The fiber optic data communication interface 44 of control treatment module 4 is for realizing mutual communication connection by Networks of Fiber Communications.So-called FPGA, refers to field programmable gate array.
The amount of outputing driver module 5, for being accepted the instruction of control treatment module 4 by the IO bus of motherboard module 1, drives the relay of outputing of peripheral hardware to perform trip operation.
Alarm signal output module 6, for being accepted the signal instruction of control treatment module 4 by the IO bus of motherboard module 1, sends alarm signal to peripheral hardware.
Display module 7 preferably adopts the display with resistance-capacitance type touch-screen and the wide temperature liquid crystal display screen of technical grade, can adapt to various adverse circumstances.
See Fig. 2 and Fig. 3, the anti-islanding device differentiated based on electric parameters of the present embodiment, it adopts the anti-islanding device differentiated based on electric parameters of 2 playscript with stage directions embodiments, is called device 1 and device 2 in use; The public network transformer station outgoing line side that device 1 need monitored is arranged; Device 2 is arranged at the distributed power source outgoing line side that need monitor; Device 1 and device 2 are communicated to connect by Networks of Fiber Communications; Method of work mainly comprises the following steps:
1. electric parameters collection: device 1 gathers voltage, the current signal of transformer station's outgoing line side; The fpga chip 42 of the control treatment module 4 of device 2 receives voltage, current signal that synchronizing clock signals controls its AD conversion chip 41 synchronous acquisition distributed power source outgoing line side; Device 1 and the respective secondary voltage current acquisition modular converter 2 of device 2 will be transferred to respective control treatment module 4 respectively after the signal transacting of collection;
2. both sides voltage, current signal frequency difference multilevel iudge is calculated: device 1 and device 2 calculate voltage, the current signal frequency of respective side respectively; The frequency values that the frequency values himself calculated and the control treatment module 4 of the device 2 called calculate compares and draws frequency-splitting Df by the control treatment module 4 of device 1; Judgment threshold Ds built-in for the CPU43 of the control treatment module 4 of this frequency-splitting Df and device 1 compares by the control treatment module 4 of device 1: if Df >=Ds, then enter step 3.; If Df < is Ds, then enter step 4.;
3. calculate electric parameters each relevant parameter, the criterion according to setting determines whether to trip: the fpga chip 42 of device 1 and the respective control treatment module 4 of device 2 controls AD conversion chip 41 synchronized sampling and completes DFT transformation calculations; The CPU43 of control treatment module 4 periodically reads result and the original sample value of DFT recursive operation from FPGA, after generating positive sequence, negative phase-sequence, zero-sequence component, utilize following criterion to judge the tripping operation of whether breaking down of public network substation line simultaneously:
Criterion 1, Sudden Changing Rate starts:
or
; In formula,
for current flow sampled value,
for current sampling data before the T moment,
for current sampling data before the 2T moment;
for current power,
be the power before 0.2 second;
for jump-value of current starts threshold,
for chugging amount starts threshold;
Criterion 2, before accident, active power should be more than or equal to setting threshold:
; In formula, P
set2for the setting threshold of setting;
be the power before 0.2 second;
Criterion 3, after accident, active power should be less than setting threshold: P
t<P
s2; In formula, P
tfor active-power P after accident
s2for setting threshold;
Criterion 4, tripping operation after-current is less than the current settings threshold value that puts into operation:
, in formula, I
set1for the current ration that puts into operation;
for current flow amplitude;
Criterion 5, current amplitude variable quantity is greater than setting threshold:
; In formula, I
set2for setting threshold;
for current flow amplitude;
it is current amplitude before 20 milliseconds;
Criterion 6, meeting criterion 1 to criterion 5 time used is greater than delay adjustments threshold value:
; In formula, t
s1for delay adjustments threshold value, t is the time starting after criterion 1 to criterion 5 all meets to calculate;
If when meeting above-mentioned criterion 1 to criterion 6 simultaneously, enter step 5.; Otherwise return step 1.;
4. the frequency departure of control treatment module 4 pairs of public network transformer station outgoing line sides of device 1 and the electric parameters of distributed power source outgoing line side carries out integral operation by following formula:
; In formula, Df is both sides frequency-splitting; If the value of result of calculation Kdf is greater than the frequency difference energy integral setting threshold established in the CPU module 3 of device 1, enter step 5.; Otherwise return step 1.;
5. the control treatment module 4 of device 1 sends trip signal to the control treatment module 4 of device 2; The control treatment module 4 of device 2 controls by its amount of outputing driver module 5 power supply cutting off distributed power source; The alarm signal output module 6 of device 1 and device 2 sends alarm signal simultaneously; Display module 7 pairs of corresponding information simultaneous displays of device 1 and device 2.
Aforesaid criterion 1 to criterion 6 is lighter in distributed generation system Power Exchange, namely small distributed power supply and localised load are close to time equal, because the electric parameters change of small distributed plant-grid connection point is little, thus there is check frequency, adopt aforesaid step method 4. to process for this reason, effectively can solve a check frequency difficult problem for existence.
To sum up, the anti-islanding device differentiated based on electric parameters of the present embodiment, structure is simple, cost is lower, field connection is convenient, applicability is strong; Adopt the electric parameters fault trip criterion based on the outlet of public network side transformer station, can reliably sentence rapidly island phenomenon and disconnect distributed power source fast, thus effectively ensure the safety of maintainer and relevant device; By gathering the electric parameters of public network side transformer station and distributed power source both sides, adopting the frequency difference method of energy integral based on both sides, effectively can eliminate the check frequency when systems exchange power is lighter that in prior art, passive type detection method exists.
Above embodiment is the explanation to the specific embodiment of the present invention; but not limitation of the present invention; person skilled in the relevant technique without departing from the spirit and scope of the present invention; can also make various conversion and change and obtain corresponding equivalent technical scheme, therefore all equivalent technical schemes all should be included into scope of patent protection of the present invention.
Claims (1)
1., based on a method of work for the anti-islanding device of electric parameters differentiation, the anti-islanding device that should differentiate based on electric parameters comprise motherboard module (1), secondary voltage current acquisition modular converter (2), intake signal acquisition module (3), control treatment module (4), the amount of outputing driver module (5), alarm signal output module (6), display module (7) and power module (8);
Described secondary voltage current acquisition modular converter (2), intake signal acquisition module (3), control treatment module (4), the amount of outputing driver module (5) and alarm signal output module (6) are all arranged in motherboard module (1);
Motherboard module (1) is provided with IO bus; Secondary voltage current acquisition modular converter (2), intake signal acquisition module (3), the amount of outputing driver module (5) and alarm signal output module (6) are equipped with signal input part, signal output part and power end; Control treatment module (4) is provided with secondary voltage current signal input, intake signal input part, the amount of outputing drive singal output, alarm signal output ends, display output and power end; Display module (7) is provided with signal input part and power end; Power module (8) is provided with power output end;
The signal output part of described secondary voltage current acquisition modular converter (2) is electrically connected with the secondary voltage current signal input two-way signaling of control treatment module (4) by the IO bus of motherboard module (1); The signal output part of intake signal acquisition module (3) is electrically connected with the intake signal input part two-way signaling of control treatment module (4) by the IO bus of motherboard module (1); The signal input part of the amount of outputing driver module (5) is electrically connected with the amount of the outputing drive singal output end signal of control treatment module (4) by the IO bus of motherboard module (1); The signal input part of alarm signal output module (6) is electrically connected with the alarm signal output ends signal of control treatment module (4) by the IO bus of motherboard module (1); The signal input part of display module (7) is electrically connected with the display output end signal of control treatment module (4); The power end of the power end of the power end of secondary voltage current acquisition modular converter (2), the power end of intake signal acquisition module (3), control treatment module (4), the power end of the amount of outputing driver module (5), the power end of alarm signal output module (6) and display module (7) is all electrically connected with the power output end of power module (8);
Described control treatment module (4) comprises AD conversion chip (41), fpga chip (42), CPU(43) and fiber optic data communication interface (44); Fpga chip (42), CPU(43) be electrically connected with AD conversion chip (41) two-way signaling respectively; Fpga chip (42), fiber optic data communication interface (44) respectively with CPU(43) two-way signaling is electrically connected; AD conversion chip (41) is provided with signal input part; Fpga chip (42) is provided with synchronizing clock signals input; The signal input part of AD conversion chip (41) is the secondary voltage current signal input of described control treatment module (4); The intake signal input part of described control treatment module (4), the amount of outputing drive singal output, alarm signal output ends and display output are by CPU(43) IO port form;
It is characterized in that: during use, the anti-islanding device differentiated based on electric parameters described in adopting 2, is called device 1 and device 2; The public network transformer station outgoing line side that device 1 need monitored is arranged; Device 2 is arranged at the distributed power source outgoing line side that need monitor; Device 1 and device 2 are communicated to connect by Networks of Fiber Communications; Method of work mainly comprises the following steps:
1. electric parameters collection: device 1 gathers voltage, the current signal of transformer station's outgoing line side; The fpga chip (42) of the control treatment module (4) of device 2 receives voltage, current signal that synchronizing clock signals controls its AD conversion chip (41) synchronous acquisition distributed power source outgoing line side; Device 1 and the respective secondary voltage current acquisition modular converter (2) of device 2 will be transferred to respective control treatment module (4) respectively after the signal transacting of collection;
2. both sides voltage, current signal frequency difference multilevel iudge is calculated: device 1 and device 2 calculate voltage, the current signal frequency of respective side respectively; The frequency values that the frequency values himself calculated and the control treatment module (4) of the device 2 called calculate compares and draws frequency-splitting Df by the control treatment module (4) of device 1; The control treatment module (4) of device 1 is by the CPU(43 of the control treatment module (4) of this frequency-splitting Df and device 1) built-in judgment threshold Ds compares: if Df >=Ds, then enter step 3.; If Df < is Ds, then enter step 4.;
3. calculate electric parameters each relevant parameter, the criterion according to setting determines whether to trip: the fpga chip (42) of device 1 and the respective control treatment module (4) of device 2 controls AD conversion chip (41) synchronized sampling and completes DFT transformation calculations; The CPU(43 of control treatment module (4)) result and the original sample value of DFT recursive operation is periodically read from FPGA, after generating positive sequence, negative phase-sequence, zero-sequence component, utilize following criterion to judge the tripping operation of whether breaking down of public network substation line simultaneously:
Criterion 1, Sudden Changing Rate starts:
or
; In formula,
for current flow sampled value,
for current sampling data before the T moment,
for current sampling data before the 2T moment;
for current power,
be the power before 0.2 second;
for jump-value of current starts threshold,
for chugging amount starts threshold;
Criterion 2, before accident, active power should be more than or equal to setting threshold:
; In formula, P
set2for the setting threshold of setting;
be the power before 0.2 second;
Criterion 3, after accident, active power should be less than setting threshold: P
t<P
s2; In formula, P
tfor active-power P after accident
s2for setting threshold;
Criterion 4, tripping operation after-current is less than the current settings threshold value that puts into operation:
, in formula, I
set1for the current ration that puts into operation;
for current flow amplitude;
Criterion 5, current amplitude variable quantity is greater than setting threshold:
; In formula, I
set2for setting threshold;
for current flow amplitude;
it is current amplitude before 20 milliseconds;
Criterion 6, meeting criterion 1 to criterion 5 time used is greater than delay adjustments threshold value:
; In formula, t
s1for delay adjustments threshold value, t is the time starting after criterion 1 to criterion 5 all meets to calculate;
If when meeting above-mentioned criterion 1 to criterion 6 simultaneously, enter step 5.; Otherwise return step 1.;
4. the frequency departure of control treatment module (4) to the electric parameters of public network transformer station outgoing line side and distributed power source outgoing line side of device 1 carries out integral operation by following formula:
; In formula, Df is both sides frequency-splitting; If result of calculation
value be greater than the frequency difference energy integral setting threshold established in the CPU module 3 of device 1, enter step 5.; Otherwise return step 1.;
5. the control treatment module (4) of device 1 sends trip signal to the control treatment module (4) of device 2; The control treatment module (4) of device 2 controls by its amount of outputing driver module (5) power supply cutting off distributed power source; The alarm signal output module (6) of device 1 and device 2 sends alarm signal simultaneously; The display module (7) of device 1 and device 2 is to corresponding information simultaneous display.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410024897.1A CN103730914B (en) | 2014-01-20 | 2014-01-20 | The anti-islanding device differentiated based on electric parameters and method of work thereof |
Applications Claiming Priority (1)
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| CN202837399U (en) * | 2012-08-28 | 2013-03-27 | 南京国电南自电网自动化有限公司 | Synchronized phasor measurement apparatus |
| CN103124068A (en) * | 2013-01-31 | 2013-05-29 | 中国电力科学研究院 | Anti-islanding protection system for distributed grid-connected system and protection method of anti-islanding protection system |
| CN203722252U (en) * | 2014-01-20 | 2014-07-16 | 江苏省电力公司常州供电公司 | Anti-islanding device based on electrical quantity discrimination |
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| CN102279327B (en) * | 2011-05-06 | 2014-06-18 | 重庆大学 | On-line monitoring and state evaluation system for photovoltaic grid-connected power generation |
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| CN202837399U (en) * | 2012-08-28 | 2013-03-27 | 南京国电南自电网自动化有限公司 | Synchronized phasor measurement apparatus |
| CN103124068A (en) * | 2013-01-31 | 2013-05-29 | 中国电力科学研究院 | Anti-islanding protection system for distributed grid-connected system and protection method of anti-islanding protection system |
| CN203722252U (en) * | 2014-01-20 | 2014-07-16 | 江苏省电力公司常州供电公司 | Anti-islanding device based on electrical quantity discrimination |
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