CN103050933B - Based on the large-sized battery energy-accumulating power station interface protection method of one-terminal current Sudden Changing Rate - Google Patents
Based on the large-sized battery energy-accumulating power station interface protection method of one-terminal current Sudden Changing Rate Download PDFInfo
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- CN103050933B CN103050933B CN201210538781.0A CN201210538781A CN103050933B CN 103050933 B CN103050933 B CN 103050933B CN 201210538781 A CN201210538781 A CN 201210538781A CN 103050933 B CN103050933 B CN 103050933B
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- 238000000034 method Methods 0.000 title claims abstract description 23
- 238000007405 data analysis Methods 0.000 claims description 11
- 238000009434 installation Methods 0.000 claims description 9
- 239000000284 extract Substances 0.000 claims description 2
- 238000005259 measurement Methods 0.000 claims description 2
- 230000035945 sensitivity Effects 0.000 abstract description 7
- 238000004088 simulation Methods 0.000 abstract description 3
- 238000004146 energy storage Methods 0.000 description 3
- 241000693079 Maloideae Species 0.000 description 2
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- 230000005611 electricity Effects 0.000 description 2
- 238000012423 maintenance Methods 0.000 description 2
- 230000004043 responsiveness Effects 0.000 description 2
- 238000005070 sampling Methods 0.000 description 2
- 238000012360 testing method Methods 0.000 description 2
- 238000004458 analytical method Methods 0.000 description 1
- 230000005540 biological transmission Effects 0.000 description 1
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Abstract
The present invention relates to the protection starting method of the interface of a kind of large-scale energy-accumulating power station and electrical network, particularly a kind of large-sized battery energy-accumulating power station interface protection method based on one-terminal current Sudden Changing Rate.The present invention utilizes one-terminal current Sudden Changing Rate to provide protection to large-scale energy-accumulating power station interface; only need single-ended electric current and information of voltage amount; the distributed power source overcome through grid-connected inverters uses the problem that traditional three-step charging and current sequence components reliability and sensitivity are lower; under various fault condition; fault can be detected reliably; simulation result shows that it has very high protection sensitivity and reliability, can action message excision fault when outer net line to line fault, two-phase grounding fault and three-phase shortcircuit.
Description
Technical field
The present invention relates to the protection starting method of the interface of a kind of large-scale energy-accumulating power station and electrical network, particularly a kind of large-sized battery energy-accumulating power station interface protection method based on one-terminal current Sudden Changing Rate.
Background technology
Constantly serious along with the continuous consumption of traditional fossil energy and the pollution of environment, technical development one of mark becoming era development of new forms of energy.Battery energy storage power station, as the stronger distributed power source of operation stability, when the distributed power source strong with other fluctuations is used in combination, plays the effect of steady power stage; For large-sized battery energy-accumulating power station (capacity is greater than 1MW), generally directly access power distribution network by circuit, peak-clipping and valley-filling is play a part to electrical network.
After external power grid breaks down, rapid failure judgement by battery energy storage power station and outer net off-the-line, is significant for protection battery energy storage power station element and outer net maintenance, maintenance safe.Find through literature search widely, the interface protection method at present for the distributed power source through grid-connected inverters is form based on traditional three-step charging substantially.For the thermal stability of power electronic device in protection inverter; distributed power source short circuit current characteristic through grid-connected inverters is different from conventional power source; its short circuit current is limited in 2 times of nominal value range usually; therefore traditional current quick and the usual tripping of time limit current quick break protection; and overcurrent protection needs to carry out complexity with external power grid and coordinate; responsiveness is usually lower, is difficult to the safety of the large-scale energy-accumulating power station element of available protecting.
Through finding the open source literature retrieval of prior art, H.Nikkhajoei, " Microgirdprotection " that R.H.Lasseter in 2007, Power Engineering Society's meeting (PowerEngineeringSocietyGeneralMeeting) delivers proposes to utilize zero-sequence current and negative-sequence current to carry out judgement fault, and the microgrid model that this criterion is built at CERTS is verified.But due to the usual non_direct ground of China's power network neutral point, the resistance value of simultaneously energy-accumulating power station equivalence when fault is comparatively large, therefore negative-sequence current and zero-sequence current value less, therefore this criterion should not use.
Summary of the invention
The object of the invention is to overcome the deficiencies in the prior art part, and provide a kind of protection act fast, the large-sized battery energy-accumulating power station interface protection method based on one-terminal current Sudden Changing Rate that action validity is high.
The present invention is achieved through the following channels:
Based on the large-sized battery energy-accumulating power station interface protection method of one-terminal current Sudden Changing Rate, its main points are, comprise the steps:
There is provided current transformer and voltage transformer, it is connected to interface protection installation place, gathers the circuit three-phase current measuring amount I of upper moment protection installation place
a, I
b, I
cand three-phase line voltage value U
aB, U
bC, U
cA;
There is provided Data Analysis Services unit, it receives the current measurement amount I gathered
a, I
b, I
cand three-phase line voltage value U
aB, U
bC, U
cA; And convert as follows:
Below calculate all for A phase, B phase, C phase are identical with A phase:
In formula, I
a.mem.k,
and I
a.mbe respectively the phase difference value of A phase current values, electric current and voltage and the amplitude of electric current, U
aB.mfor the maximum of AB phase voltage;
There is provided memory cell, it records and stores each phase current values size and the electric current of correspondence and the phase difference value of voltage that a moment obtains;
Further, the circuit three-phase current measuring amount I of this moment protection installation place is gathered according to current transformer and voltage transformer
a+1, I
b+1, I
c+1and three-phase line voltage value U
aB+1, U
bC+1, U
cA+1, and obtain I by Data Analysis Services unit according to above-mentioned computing
a.mem.k+1,
and I
a.m+1, and same obtain this moment B phase and the current value of C phase and the phase difference value of electric current and voltage;
Data Analysis Services unit extracts each phase current values size and the phase difference value of electric current and voltage of record at upper a moment from memory cell, carries out subtracting each other of corresponding phase, be specially with the current value in this moment and phase difference value:
Order:
Therefore can obtain:
Arranging adjacent moment current value change setting value is I
sta.1, phase current values setting value be I
sta.2, to making the following judgment as difference of the phase difference value of the adjacent moment current differential of every phase and electric current and voltage: for A phase, B phase is identical with A phase with C phase: first judge △ I
a>I
sta.1and I
a>I
sta.2if above-mentioned two formulas are set up, then judge further
wherein
for the setting value of setting, if set up, then send triggering command by Data Analysis Services unit, start the proterctive equipment of large-sized battery energy-accumulating power station.
Principle of the present invention is: when electrical network normally runs, and energy-accumulating power station is as an important means of peak-clipping and valley-filling, and now main active power of output, therefore the power factor value that runs of energy-accumulating power station is close to 1, now
(or
or
) value less, its variable quantity
(or
) also less.After outer net breaks down, the angle of energy-accumulating power station exit potential and electric current is in fact close with the impedance angle size of circuit.Due to reactance value large percentage in transmission line impedance, therefore during fault, the actual voltage that records and electric current angle can increase instantaneously, can make exit protection act when it exceedes when protection seting value is greater than setting value.
The present invention utilizes one-terminal current Sudden Changing Rate to provide protection to large-scale energy-accumulating power station interface, and it only needs single-ended electric current and information of voltage amount, improves the reliability of equipment.The distributed power source overcome through grid-connected inverters uses the problem that traditional three-step charging and current sequence components reliability and sensitivity are lower, and the present invention can action message excision fault when outer net line to line fault, two-phase grounding fault and three-phase shortcircuit.
The present invention has substantive distinguishing features and marked improvement; because inverter in large-scale energy-accumulating power station provides the characteristic of short circuit current different from conventional power source; therefore existing defects in traditional three-stage protection principle; can not action message; and responsiveness is comparatively slow, the protection requirement of protection distributed power source can not be met.The method that the present invention proposes utilizes the variable quantity of electric current, and under various fault condition, can detect fault reliably, simulation result shows that it has very high protection sensitivity and reliability, is a kind of method being well applicable to large-scale energy-accumulating power station outlet protection.
The present invention can be specially further:
I
sta.1on the bus being greater than energy-accumulating power station access institute it exports current value variable quantity, I when being with peak load to start
sta.2the current value exported under being greater than energy-accumulating power station maximum operational mode.
Be specially further:
In formula, k, U
n, P
bESS.maxbe system and energy-accumulating power station parameter, when k represents that outer net normally runs, energy-accumulating power station to access on bus peak load and starts, the ratio of energy-accumulating power station side electric current boost value and maximum load current value, U
nfor system nominal voltage, P
bESS.maxfor the maximum outlet power of energy-accumulating power station.
be greater than maximum work angle when normally running,
be 90 °, concrete
for:
in formula, k
relfor safety factor, get 0.9 ~ 1, Q
maxfor the maximum output reactive power of energy-accumulating power station, P
nfor the rated power of energy-accumulating power station.
In sum, the invention provides a kind of large-sized battery energy-accumulating power station interface protection method based on one-terminal current Sudden Changing Rate, one-terminal current Sudden Changing Rate is utilized to provide protection to large-scale energy-accumulating power station interface, only need single-ended electric current and information of voltage amount, the distributed power source overcome through grid-connected inverters uses the problem that traditional three-step charging and current sequence components reliability and sensitivity are lower, under various fault condition, fault can be detected reliably, simulation result shows that it has very high protection sensitivity and reliability, at outer net line to line fault, can action message excision fault when two-phase grounding fault and three-phase shortcircuit.
Below in conjunction with embodiment, the present invention is further elaborated.
Embodiment
Most preferred embodiment:
Based on the large-sized battery energy-accumulating power station interface protection method of one-terminal current Sudden Changing Rate, comprise the steps:
(1) provide current transformer and voltage transformer, it is connected to interface protection installation place, and gather three-phase electricity flow and the three-phase voltage amount of protection installation place, as protection component institute subfam. Spiraeoideae, current transformer connection form adopts standard wiring;
(2) by the current value size of memory cell record previous moment and electric current and voltage phase difference, for subsequent time collection value as a reference;
(3) utilize the electric current in the electric current in this moment and phase place and a upper moment and phase value to make mathematic interpolation, and compare jump-value of current;
(4) setting value of jump-value of current and protection is compared, determine to protect whether action according to comparative result.
Concrete, in described step (1), phase selection element institute subfam. Spiraeoideae is specific as follows:
Electricity required for the present invention is the circuit three-phase current (I of protection installation place
a, I
b, I
c) and three-phase line voltage (U
aB, U
bC, U
cA), data sampling frequency is 1200Hz.
In described step (2), provide Data Analysis Services unit, three-phase current and voltage analysis amount specific as follows:
For A phase:
In formula, I
a.mem.k,
and I
a.mbe respectively the amplitude of A phase current size memory value, phase-memory value and electric current, U
aB.mfor the maximum of AB phase voltage.Other biphase current values and the same above formula of phase place.
In described step (3), the method identical with step (2) is adopted to obtain the A phase current I of this instance sample point
a.mem.k+1, and three-phase current phase place
the current value in former and later two moment is done poor as follows:
Order:
Can be obtained fom the above equation:
In described (4), fault initiating criterion is specific as follows:
Protection criteria is formed primarily of current value variable quantity and phase angle change amount.Protection start-up criterion:
△I
A>I
sta.11)
I
A>I
sta.22)
I
sta.1, I
sta.2be respectively current change quantity and the phase current criterion of protection component, I
sta.1on the bus that should be greater than energy-accumulating power station access institute it exports current value variable quantity, I when being with peak load to start
sta.2the current value exported under should being greater than energy-accumulating power station maximum operational mode, specific as followsly shows:
Formula 3), 4) in, k, U
n, P
bESS.maxbe system and energy-accumulating power station parameter, when k represents that outer net normally runs, energy-accumulating power station to access on bus peak load and starts, the ratio of energy-accumulating power station side electric current boost value and maximum load current value, U
nfor system nominal voltage, P
bESS.maxfor the maximum outlet power of energy-accumulating power station.
After the starting component of protection starts, the Protection criteria of large-sized battery energy-accumulating power station is as follows:
Formula 5) in
for setting value,
maximum work angle when normally running should be greater than,
should within the scope of 90 °, specific as follows:
Formula 6), 7) in, k
relfor safety factor, desirable 0.9 ~ 1, Q
maxfor the maximum output reactive power of energy-accumulating power station, P
nfor the rated power of energy-accumulating power station.
Said process is the deterministic process of A phase, the data analysis of B phase and C phase and A phase and process and criterion completely the same.After above-mentioned electric current and phase difference meet criterion, send triggering command by Data Analysis Services unit, start the proterctive equipment of large-sized battery energy-accumulating power station.
In order to verify reliability and the technique effect of the method for the invention, the electromagnetic transients program EMTP that the inventive method utilizes the world extensively to adopt has carried out emulation experiment.Analogue system is 10KV system, and circuit is lumped parameter model.Data sampling rate is 1200Hz.The result utilizing guard method of the present invention to carry out testing shows that the inventive method has very high reliability and sensitivity.The fault type of test includes the short circuit of AB phase, the short circuit of BC phase, the short circuit of AC phase, AB phase ground short circuit, BC phase ground short circuit, AC phase ground short circuit, ABC three-phase shortcircuit.
It is same as the prior art that the present invention does not state part.
Claims (1)
1., based on the large-sized battery energy-accumulating power station interface protection method of one-terminal current Sudden Changing Rate, it is characterized in that, comprise the steps:
There is provided current transformer and voltage transformer, it is connected to interface protection installation place, gathers the circuit three-phase current measuring amount I of upper moment protection installation place
a, I
b, I
cand three-phase line voltage value U
aB, U
bC, U
cA;
There is provided Data Analysis Services unit, it receives the current measurement amount I gathered
a, I
b, I
cand three-phase line voltage value U
aB, U
bC, U
cA; And convert as follows:
Below calculate all for A phase, B phase, C phase are identical with A phase:
In formula, I
a.mem.k,
and I
a.mbe respectively the phase difference value of A phase current values, electric current and voltage and the amplitude of electric current, U
aB.mfor the maximum of AB phase voltage;
There is provided memory cell, it records and stores each phase current values size and the electric current of correspondence and the phase difference value of voltage that a moment obtains;
Further, the circuit three-phase current measuring amount I of this moment protection installation place is gathered according to current transformer and voltage transformer
a+1, I
b+1, I
c+1and three-phase line voltage value U
aB+1, U
bC+1, U
cA+1, and obtain I by Data Analysis Services unit according to above-mentioned computing
a.mem.k+1,
and I
a.m+1, and same obtain this moment B phase and the current value of C phase and the phase difference value of electric current and voltage;
Data Analysis Services unit extracts each phase current values size of record at upper a moment and the phase difference value of electric current and voltage from memory cell, the subtraction calculations of corresponding phase is carried out with the current value in this moment and phase difference value, for A phase, B phase is identical with A phase with C phase, is specially:
Order:
Therefore can obtain:
Arranging adjacent moment current value change setting value is I
sta.1, phase current values setting value be I
sta.2, to making the following judgment as difference of the phase difference value of the adjacent moment current differential of every phase and electric current and voltage: for A phase, B phase is identical with A phase with C phase: first judge △ I
a>I
sta.1and I
a>I
sta.2if above-mentioned two formulas are set up, then judge further
wherein
for the setting value of setting, if set up, then send triggering command by Data Analysis Services unit, start the proterctive equipment of large-sized battery energy-accumulating power station; Wherein:
I
sta.1on the bus being greater than energy-accumulating power station access institute it exports current value variable quantity, I when being with peak load to start
sta.2the current value exported under being greater than energy-accumulating power station maximum operational mode, is specially:
In formula, k, U
n, P
bESS.maxbe system and energy-accumulating power station parameter, when k represents that outer net normally runs, energy-accumulating power station to access on bus peak load and starts, the ratio of energy-accumulating power station side electric current boost value and maximum load current value, U
nfor system nominal voltage, P
bESS.maxfor the maximum outlet power of energy-accumulating power station;
be greater than maximum work angle when normally running,
be 90 °, concrete
for:
in formula, k
relfor safety factor, get 0.9 ~ 1, Q
maxfor the maximum output reactive power of energy-accumulating power station, P
nfor the rated power of energy-accumulating power station.
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| CN103311908B (en) * | 2013-05-19 | 2016-03-30 | 国家电网公司 | Single end current is utilized to realize transmission line single-phase high-impedance relay protecting method |
| CN104880638A (en) * | 2015-05-12 | 2015-09-02 | 国家电网公司 | System and method for quick recognizing fault current in power system |
| CN106340863B (en) * | 2016-11-14 | 2018-05-08 | 国网天津市电力公司 | A kind of guard method of adaptive transient current quick-break |
| CN106451348A (en) * | 2016-12-09 | 2017-02-22 | 上海山源电子科技股份有限公司 | Short-circuit protection method for current-limiting protector and current-limiting protector |
| CN110907746B (en) * | 2018-09-18 | 2022-08-30 | 深圳供电局有限公司 | High-voltage alternating-current line open-circuit fault identification method, device, equipment and storage medium |
| CN109067811B (en) * | 2018-10-22 | 2021-04-20 | 南京科远智慧科技集团股份有限公司 | Method for automatically identifying position of internal and external network processing unit for physical isolation network gate |
| CN111781436B (en) * | 2019-04-04 | 2021-07-13 | 株洲中车时代电气股份有限公司 | Fault detection device and method for current converter and current conversion system |
| CN114764599B (en) * | 2022-04-26 | 2023-06-09 | 国网四川省电力公司电力科学研究院 | Power distribution network single-phase earth fault sensitivity analysis method and system |
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| CN101286634A (en) * | 2008-02-22 | 2008-10-15 | 西安交通大学 | Protection method of parellel reactor based on parameter identification |
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