CN103795086A - Voltage resynchronization detection method for conversion of micro-grid from isolated-island operation to grid-connected operation - Google Patents
Voltage resynchronization detection method for conversion of micro-grid from isolated-island operation to grid-connected operation Download PDFInfo
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- CN103795086A CN103795086A CN201410023589.7A CN201410023589A CN103795086A CN 103795086 A CN103795086 A CN 103795086A CN 201410023589 A CN201410023589 A CN 201410023589A CN 103795086 A CN103795086 A CN 103795086A
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Abstract
The invention discloses a voltage resynchronization detection method for the conversion of a micro-grid from isolated-island operation to grid-connected operation. A super sampling unit is used for continuously sampling three-phase voltage on two sides of a common coupling pint of the micro-grid, wherein the highest sampling frequency of the super sampling unit can reach 10kHz. Then, a software phase-locked loop is used for calculating the voltages and angles of the two sides in real time. By contrasting differences between the voltages and the angles on the two sides, whether the micro-grid meets conditions of resynchronization grid connection is determined, so that detection criteria are provided for resynchronization grid connection of the micro-grid, grid connection conditions can still be effectively determined for a complex micro-grid even when an energy storage unit breaks down, an objective and redundant basis is provided for the conversion process of the complex micro-grid from isolated-island operation to grid-connected operation, and it is avoided that non-synchronous grid connection is caused by detected faults of the energy storage unit, and the voltage resynchronization detection method has the advantages of being novel in concept, safe, reliable and broad in application prospects.
Description
Technical field
The present invention relates to intelligent grid technical field, be specifically related to a kind of micro-electrical network islet operation and turn the voltage synchronization detecting method being again incorporated into the power networks.
Background technology
Along with country constantly increases the demand of clean energy resource generating, the grid-connected of intermittent regenerative resource accepted by social gradually, but because the grid-connected permeability of regenerative resource constantly expanding makes intermittence and scheduling and stable have a negative impact of fluctuation to electrical network of single regenerative resource, at present.Adopt the mode of intelligent micro-grid, intermittent renewable power supply and load, energy-storage units are integrated into a system, make micro-electrical network become a considerable controlled intelligent cell in electrical network, simultaneously, in the time of outside electric network fault, can be for user in micro-electrical network provides uninterrupted sustainable electric power, can greatly reduce and even solve the destabilizing factor that the intermittent power supply of intermittent regenerative resource brings.
At present, micro-electrical network can grid-connected or lonely network operation, when micro-electrical network is turned while being incorporated into the power networks by islet operation, need to guarantee microgrid point of common coupling isolated island side and large grid side voltage Complete Synchronization, conventionally adopt by the mode of energy accumulation current converter secondary side expansion voltage detecting and detect and bring into synchronously, but this detection method is for the manager and integrator of micro-electrical network, belong to indirect detection, and in the time existing many energy-storage units in parallel, lack unified foundation, improve the complexity detecting, thereby reduced the reliability when turning net and being incorporated into the power networks.
Summary of the invention
The object of the invention is to overcome micro-electrical network that prior art exists is turned while being incorporated into the power networks by islet operation, conventionally adopt by the mode of energy accumulation current converter secondary side expansion voltage detecting and detect and bring into synchronously, but be indirect detection, and in the time that many energy-storage units are in parallel, lack unified foundation, improve the complexity detecting, reduce the problem of the reliability when turning net and being incorporated into the power networks.
In order to achieve the above object, the technical solution adopted in the present invention is:
Micro-electrical network islet operation turns the voltage synchronization detecting method being again incorporated into the power networks, and it is characterized in that: comprise the following steps,
Step (1), turns according to micro-electrical network islet operation the demand being incorporated into the power networks, and sets micro-electrical network islet operation and turns voltage magnitude decision threshold U, the angle decision threshold θ and the minimum duration decision threshold t that are incorporated into the power networks;
Step (2), gathers the inside and outside both sides of micro-electrical network point of common coupling three-phase voltage parameter by over-extraction sample measurement and control unit real-time synchronization;
Step (3), reads three-phase voltage U a2, Ub2 outside three-phase voltage U a1, Ub1 inside micro-electrical network point of common coupling, Uc1 and micro-electrical network point of common coupling, Uc2;
Step (4), calculates respectively voltage magnitude U1, the angle θ 1 of voltage and voltage magnitude U2, the angle θ 2 of outside voltage inside micro-electrical network point of common coupling according to software phase-lock loop;
Step (5) if meet | U1-U2|<U and | θ 1-θ 2|< θ, record the duration, and enter step (6); Otherwise, stop micro-electrical network islet operation and turn and be incorporated into the power networks;
Step (6), if the duration of recording of step (5) record is greater than minimum duration decision threshold t, carries out micro-electrical network islet operation and turns and be incorporated into the power networks, otherwise, stop micro-electrical network islet operation and turn and be incorporated into the power networks.
Aforesaid a kind of micro-electrical network islet operation turns the voltage synchronization detecting method being again incorporated into the power networks, and it is characterized in that: the sample frequency of the described over-extraction sample of step (2) measurement and control unit is 10kHz.
Aforesaid a kind of micro-electrical network islet operation turns the voltage synchronization detecting method being again incorporated into the power networks, and it is characterized in that: step (4) according to software phase-lock loop calculate respectively the voltage magnitude U1 of voltage inside micro-electrical network point of common coupling, the method for angle θ 1 is,
(1), by three-phase voltage U a1, Ub1, Uc1 inside the micro-electrical network point of common coupling reading, carry out 3/2 coordinate transform, according to formula (1), obtain the inner side three-phase voltage vector under synchronous rotating frame
for
Wherein, U1
dfor inner side three-phase voltage vector
d axle component, U1
qfor inner side three-phase voltage vector
q axle component;
(2) pass through inner side three-phase voltage vector
ask mould to calculate, obtain the voltage magnitude U1 of voltage inside micro-electrical network point of common coupling;
(3) by inner side three-phase voltage vector
q axle component U1
q, send into PI controller, according to formula (2), the angular velocity omega [n] of PI controller output inner side three-phase voltage,
ω[n]=ω[n-1]+kp(U1q[n]-U1q[n-1])+ki*U1q[n] （2）
Wherein, ω [n-1] is the angular speed of a upper control cycle PI controller output inner side three-phase voltage; U1q[n] and U1q[n-1] be respectively the inner side three-phase voltage vector of a current and upper control cycle output
q axle component; Kp and ki are respectively ratio and the integral coefficient of PI controller;
(4) by the angular velocity omega [n] of PI controller output inner side three-phase voltage, through digital integrator, then twice circumference ratio is asked to mould, according to formula (3), obtains the angle θ 1 of voltage inside micro-electrical network point of common coupling,
θ
1[n]=(θ
1[n-1]+T
c*ω[n])mod(2π) (3)
Wherein, θ
1[n] is current control cycle angle output valve, i.e. the angle θ 1 of voltage inside micro-electrical network point of common coupling, θ
1[n-1] is a upper control cycle angle output valve, T
cfor control cycle.
Aforesaid a kind of micro-electrical network islet operation turns the voltage synchronization detecting method being again incorporated into the power networks, and it is characterized in that: step (4) according to software phase-lock loop calculate respectively the voltage magnitude U2 of voltage outside micro-electrical network point of common coupling, the method for angle θ 2 is,
(1), by three-phase voltage U a2, Ub2, Uc2 outside the micro-electrical network point of common coupling reading, carry out 3/2 coordinate transform, according to formula (4), obtain the inner side three-phase voltage vector under synchronous rotating frame
for,
Wherein, U2
dfor outside three-phase voltage vector
d axle component, U2
qfor outside three-phase voltage vector
q axle component;
(2) pass through outside three-phase voltage vector
ask mould to calculate, obtain the voltage magnitude U2 of voltage outside micro-electrical network point of common coupling;
(3) by outside three-phase voltage vector
q axle component U2
q, send into PI controller, according to formula (5), the angular velocity omega of PI controller output inner side three-phase voltage ' [n],
ω’[n]=ω’[n-1]+k
p(U2
q[n]-U2
q[n-1])+k
i*U2
q[n] （5）
Wherein, ω ' [n-1] is the angular speed of a upper control cycle PI controller output outside three-phase voltage; U2q[n] and U2q[n-1] be respectively the outside three-phase voltage vector of a current and upper control cycle output
q axle component; Kp and ki are respectively ratio and the integral coefficient of PI controller;
(4) by the angular velocity omega of PI controller output outside three-phase voltage ' [n-1], through digital integrator, then twice circumference ratio is asked to mould, according to formula (6), obtain the angle θ 2 of voltage outside micro-electrical network point of common coupling,
θ
2[n]=(θ
2[n-1]+T
c*ω[n])mod(2π) (6)
Wherein, θ
2[n] is current control cycle angle output valve, i.e. the angle θ 2 of voltage inside micro-electrical network point of common coupling, θ
2[n-1] is a upper control cycle angle output valve, T
cfor control cycle.
The invention has the beneficial effects as follows: micro-electrical network islet operation of the present invention turns the voltage synchronization detecting method being again incorporated into the power networks, the super sampling unit that employing reaches as high as 10kHz sample frequency continues sampling to micro-electrical network point of common coupling both sides three-phase voltage, calculate in real time both sides voltage and angle by software phase-lock loop again, judge by the extent of contrast both sides level angle whether micro-electrical network meets synchronous grid-connected condition again, for the synchronous grid-connected detection criteria that provides again of micro-electrical network, make complicated micro-electrical network in the time that energy-storage units breaks down, still can effectively judge grid-connected condition, for the micro-electrical network of complexity provides the foundation of objective redundancy in lonely net turns the process of being incorporated into the power networks, avoid causing because of energy-storage units detection failure the generation of asynchronous grid-connected situation, thinking novelty, safe and reliable, have a good application prospect.
Accompanying drawing explanation
Fig. 1 is that micro-electrical network islet operation of the present invention turns the voltage flow chart of synchronization detecting method being again incorporated into the power networks.
Fig. 2 is the system architecture diagram of the micro-electrical network central controller of PLC over-extraction sample of the present invention.
To be the present invention calculate the voltage magnitude of voltage inside micro-electrical network point of common coupling, the system block diagram of angle according to software phase-lock loop to Fig. 3.
To be the present invention calculate the voltage magnitude of voltage outside micro-electrical network point of common coupling, the system block diagram of angle according to software phase-lock loop to Fig. 4.
Embodiment
Below in conjunction with Figure of description, the present invention is further illustrated.
A kind of micro-electrical network islet operation of the present invention turns the voltage synchronization detecting method being again incorporated into the power networks, and it is characterized in that: comprise the following steps,
Step (1), turns according to micro-electrical network islet operation the demand being incorporated into the power networks, and sets micro-electrical network islet operation and turns voltage magnitude decision threshold U, the angle decision threshold θ and the minimum duration decision threshold t that are incorporated into the power networks; Owing to there is no at present relevant pressure standard, each threshold value can by engineer according to field condition demand adjustment set, it is 3%Un (Un is grid-connected side rated voltage) that acquiescence preset value can be established voltage magnitude decision threshold U, and angle decision threshold θ is 1% π, and t is 0.1 second;
Step (2), gathers the inside and outside both sides of micro-electrical network point of common coupling three-phase voltage parameter by over-extraction sample measurement and control unit real-time synchronization;
Step (3), reads three-phase voltage U a2, Ub2 outside three-phase voltage U a1, Ub1 inside micro-electrical network point of common coupling, Uc1 and micro-electrical network point of common coupling, Uc2;
Step (4), calculate respectively voltage magnitude U1, the angle θ 1 of voltage and voltage magnitude U2, the angle θ 2 of outside voltage inside micro-electrical network point of common coupling according to software phase-lock loop, wherein, calculate the voltage magnitude U1 of voltage inside micro-electrical network point of common coupling, the process of angle θ 1, as shown in Figure 3
1), by three-phase voltage U a1, Ub1, Uc1 inside the micro-electrical network point of common coupling reading, carry out 3/2 coordinate transform, according to formula (1), obtain the inner side three-phase voltage vector under synchronous rotating frame
for
Wherein, U1
dfor inner side three-phase voltage vector
d axle component, U1
qfor inner side three-phase voltage vector
q axle component;
2) pass through inner side three-phase voltage vector
ask mould to calculate, obtain the voltage magnitude U1 of voltage inside micro-electrical network point of common coupling;
3) by inner side three-phase voltage vector
q axle component U1
q, send into PI controller, according to formula (2), the angular velocity omega [n] of PI controller output inner side three-phase voltage,
ω[n]=ω[n-1]+kp(U1q[n]-U1q[n-1])+ki*U1q[n] （2）
Wherein, ω [n-1] is the angular speed of a upper control cycle PI controller output inner side three-phase voltage; U1q[n] and U1q[n-1] be respectively the inner side three-phase voltage vector of a current and upper control cycle output
q axle component; Kp and ki are respectively ratio and the integral coefficient of PI controller;
4) by the angular velocity omega [n] of PI controller output inner side three-phase voltage, through digital integrator, then twice circumference ratio is asked to mould, according to formula (3), obtains the angle θ 1 of voltage inside micro-electrical network point of common coupling,
θ
1[n]=(θ
1[n-1]+T
c*ω[n])mod(2π) (3)
Wherein, θ
1[n] is current control cycle angle output valve, i.e. the angle θ 1 of voltage inside micro-electrical network point of common coupling, θ
1[n-1] is a upper control cycle angle output valve, T
cfor control cycle, when calculating, π is circumference ratio, retains 6 position effective digitals;
Calculate the voltage magnitude U2 of voltage outside micro-electrical network point of common coupling, the process of angle θ 2, method is similar with the process of calculating voltage magnitude U1, the angle θ 1 of voltage inside micro-electrical network point of common coupling, specifically as shown in Figure 4,
1), by three-phase voltage U a2, Ub2, Uc2 outside the micro-electrical network point of common coupling reading, carry out 3/2 coordinate transform, according to formula (4), obtain the inner side three-phase voltage vector under synchronous rotating frame
for,
Wherein, U2
dfor outside three-phase voltage vector
d axle component, U2
qfor outside three-phase voltage vector
q axle component;
2) pass through outside three-phase voltage vector
ask mould to calculate, obtain the voltage magnitude U2 of voltage outside micro-electrical network point of common coupling;
3) by outside three-phase voltage vector
q axle component U2
q, send into PI controller, according to formula (5), the angular velocity omega of PI controller output inner side three-phase voltage ' [n],
ω’[n]=ω’[n-1]+k
p(U2
q[n]-U2
q[n-1])+k
i*U2
q[n] （5）
Wherein, ω ' [n-1] is the angular speed of a upper control cycle PI controller output outside three-phase voltage; U2q[n] and U2q[n-1] be respectively the outside three-phase voltage vector of a current and upper control cycle output
q axle component; Kp and ki are respectively ratio and the integral coefficient of PI controller;
4) by the angular velocity omega of PI controller output outside three-phase voltage ' [n-1], through digital integrator, then twice circumference ratio is asked to mould, according to formula (6), obtain the angle θ 2 of voltage outside micro-electrical network point of common coupling,
θ
2[n]=(θ
2[n-1]+T
c*ω[n])mod(2π) (6)
Wherein, θ
2[n] is current control cycle angle output valve, i.e. the angle θ 2 of voltage inside micro-electrical network point of common coupling, θ
2[n-1] is a upper control cycle angle output valve, T
cfor control cycle, when calculating, π is circumference ratio, retains 6 position effective digitals;
Step (5) if meet | U1-U2|<U and | θ 1-θ 2|< θ, record the duration, and enter step (6); Otherwise, stop micro-electrical network islet operation and turn and be incorporated into the power networks;
Step (6), if the duration of recording of step (5) record is greater than minimum duration decision threshold t, carries out micro-electrical network islet operation and turns and be incorporated into the power networks, otherwise, stop micro-electrical network islet operation and turn and be incorporated into the power networks.
The sample frequency of described over-extraction sample measurement and control unit is 10kHz, this kind of over-extraction sample measurement and control unit, as shown in Figure 2, optional PLC over-extraction sample microgrid central controller, it is the sampling clock of 10kHz that PLC over-extraction sample microgrid central controller can provide sample frequency, and be provided with 4 tunnel USB interface, 2 road Ethernet interfaces, 2 road serial interfaces, over-extraction sample measurement and control unit is plugged on the slot of PLC over-extraction sample microgrid central controller, slot quantity can be expanded, and the islet operation that can be used for multiple small-sized micro-electrical networks turns the detection of being incorporated into the power networks.
In sum, micro-electrical network islet operation of the present invention turns the voltage synchronization detecting method being again incorporated into the power networks, the super sampling unit that employing reaches as high as 10kHz sample frequency continues sampling to micro-electrical network point of common coupling both sides three-phase voltage, calculate in real time both sides voltage and angle by software phase-lock loop again, judge by the extent of contrast both sides level angle whether micro-electrical network meets synchronous grid-connected condition again, for the synchronous grid-connected detection criteria that provides again of micro-electrical network, make complicated micro-electrical network in the time that energy-storage units breaks down, still can effectively judge grid-connected condition, for the micro-electrical network of complexity provides the foundation of objective redundancy in lonely net turns the process of being incorporated into the power networks, avoid causing because of energy-storage units detection failure the generation of asynchronous grid-connected situation, thinking novelty, safe and reliable, have a good application prospect.
More than show and described basic principle of the present invention, principal character and advantage.The technical staff of the industry should understand; the present invention is not restricted to the described embodiments; that in above-described embodiment and specification, describes just illustrates principle of the present invention; without departing from the spirit and scope of the present invention; the present invention also has various changes and modifications, and these changes and improvements all fall in the claimed scope of the invention.The claimed scope of the present invention is defined by appending claims and equivalent thereof.
Claims (4)
1. micro-electrical network islet operation turns the voltage synchronization detecting method being again incorporated into the power networks, and it is characterized in that: comprise the following steps,
Step (1), turns according to micro-electrical network islet operation the demand being incorporated into the power networks, and sets micro-electrical network islet operation and turns voltage magnitude decision threshold U, the angle decision threshold θ and the minimum duration decision threshold t that are incorporated into the power networks;
Step (2), gathers the inside and outside both sides of micro-electrical network point of common coupling three-phase voltage parameter by over-extraction sample measurement and control unit real-time synchronization;
Step (3), reads three-phase voltage U a2, Ub2 outside three-phase voltage U a1, Ub1 inside micro-electrical network point of common coupling, Uc1 and micro-electrical network point of common coupling, Uc2;
Step (4), calculates respectively voltage magnitude U1, the angle θ 1 of voltage and voltage magnitude U2, the angle θ 2 of outside voltage inside micro-electrical network point of common coupling according to software phase-lock loop;
Step (5) if meet | U1-U2|<U and | θ 1-θ 2|< θ, record the duration, and enter step (6); Otherwise, stop micro-electrical network islet operation and turn and be incorporated into the power networks;
Step (6), if the duration of recording of step (5) record is greater than minimum duration decision threshold t, carries out micro-electrical network islet operation and turns and be incorporated into the power networks, otherwise, stop micro-electrical network islet operation and turn and be incorporated into the power networks.
2. a kind of micro-electrical network islet operation according to claim 1 turns the voltage synchronization detecting method being again incorporated into the power networks, and it is characterized in that: the sample frequency of the described over-extraction sample of step (2) measurement and control unit is 10kHz.
3. a kind of micro-electrical network islet operation according to claim 1 turns the voltage synchronization detecting method being again incorporated into the power networks, it is characterized in that: step (4) according to software phase-lock loop calculate respectively the voltage magnitude U1 of voltage inside micro-electrical network point of common coupling, the method for angle θ 1 is
(1), by three-phase voltage U a1, Ub1, Uc1 inside the micro-electrical network point of common coupling reading, carry out 3/2 coordinate transform, according to formula (1), obtain the inner side three-phase voltage vector under synchronous rotating frame
for
Wherein, U1
dfor inner side three-phase voltage vector
d axle component, U1
qfor inner side three-phase voltage vector
q axle component;
(2) pass through inner side three-phase voltage vector
ask mould to calculate, obtain the voltage magnitude U1 of voltage inside micro-electrical network point of common coupling;
(3) by inner side three-phase voltage vector
q axle component U1
q, send into PI controller, according to formula (2), the angular velocity omega [n] of PI controller output inner side three-phase voltage,
ω[n]=ω[n-1]+kp(U1q[n]-U1q[n-1])+ki*U1q[n] （2）
Wherein, ω [n-1] is the angular speed of a upper control cycle PI controller output inner side three-phase voltage; U1q[n] and U1q[n-1] be respectively the inner side three-phase voltage vector of a current and upper control cycle output
q axle component; Kp and ki are respectively ratio and the integral coefficient of PI controller;
(4) by the angular velocity omega [n] of PI controller output inner side three-phase voltage, through digital integrator, then twice circumference ratio is asked to mould, according to formula (3), obtains the angle θ 1 of voltage inside micro-electrical network point of common coupling,
θ
1[n]=(θ
1[n-1]+T
c*ω[n])mod(2π) (3)
Wherein, θ
1[n] is current control cycle angle output valve, i.e. the angle θ 1 of voltage inside micro-electrical network point of common coupling, θ
1[n-1] is a upper control cycle angle output valve, T
cfor control cycle.
4. a kind of micro-electrical network islet operation according to claim 1 turns the voltage synchronization detecting method being again incorporated into the power networks, it is characterized in that: step (4) according to software phase-lock loop calculate respectively the voltage magnitude U2 of voltage outside micro-electrical network point of common coupling, the method for angle θ 2 is
(1), by three-phase voltage U a2, Ub2, Uc2 outside the micro-electrical network point of common coupling reading, carry out 3/2 coordinate transform, according to formula (4), obtain the inner side three-phase voltage vector under synchronous rotating frame
for,
Wherein, U2
dfor outside three-phase voltage vector
d axle component, U2
qfor outside three-phase voltage vector
q axle component;
(2) pass through outside three-phase voltage vector
ask mould to calculate, obtain the voltage magnitude U2 of voltage outside micro-electrical network point of common coupling;
(3) by outside three-phase voltage vector
q axle component U2
q, send into PI controller, according to formula (5), the angular velocity omega of PI controller output inner side three-phase voltage ' [n],
ω’[n]=ω’[n-1]+k
p(U2
q[n]-U2
q[n-1])+k
i*U2
q[n] （5）
Wherein, ω ' [n-1] is the angular speed of a upper control cycle PI controller output outside three-phase voltage; U2q[n] and U2q[n-1] be respectively the outside three-phase voltage vector of a current and upper control cycle output
q axle component; Kp and ki are respectively ratio and the integral coefficient of PI controller;
(4) by the angular velocity omega of PI controller output outside three-phase voltage ' [n-1], through digital integrator, then twice circumference ratio is asked to mould, according to formula (6), obtain the angle θ 2 of voltage outside micro-electrical network point of common coupling,
θ
2[n]=(θ
2[n-1]+T
c*ω[n])mod(2π) (6)
Wherein, θ
2[n] is current control cycle angle output valve, i.e. the angle θ 2 of voltage inside micro-electrical network point of common coupling, θ
2[n-1] is a upper control cycle angle output valve, T
cfor control cycle.
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Cited By (4)
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| CN104749475A (en) * | 2015-04-24 | 2015-07-01 | 南车株洲电力机车研究所有限公司 | Motor vehicle island detection method and system |
| CN109298284A (en) * | 2018-09-18 | 2019-02-01 | 四川大学 | The method and system of island effect detection are carried out using PMU measurement phasor angle-data |
| US10797488B2 (en) | 2016-08-23 | 2020-10-06 | General Electric Company | Systems and methods for operatively coupling a micro-grid to a bulk grid |
| US10965153B2 (en) | 2016-02-05 | 2021-03-30 | Duke Energy Corporation | Methods of microgrid communications and connection transitions |
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| WO2003103112A1 (en) * | 2002-05-31 | 2003-12-11 | Ballard Power Systems Corporation | A hybrid synchronization phase angle generation method |
| CN102723741A (en) * | 2012-04-26 | 2012-10-10 | 南京航空航天大学 | Grid connection presynchronization control method of microgrid inverter based on droop control |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104749475A (en) * | 2015-04-24 | 2015-07-01 | 南车株洲电力机车研究所有限公司 | Motor vehicle island detection method and system |
| CN104749475B (en) * | 2015-04-24 | 2017-09-22 | 南车株洲电力机车研究所有限公司 | A kind of locomotive island detection method and system |
| US10965153B2 (en) | 2016-02-05 | 2021-03-30 | Duke Energy Corporation | Methods of microgrid communications and connection transitions |
| US10797488B2 (en) | 2016-08-23 | 2020-10-06 | General Electric Company | Systems and methods for operatively coupling a micro-grid to a bulk grid |
| CN109298284A (en) * | 2018-09-18 | 2019-02-01 | 四川大学 | The method and system of island effect detection are carried out using PMU measurement phasor angle-data |
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|---|---|
| CN103795086B (en) | 2016-05-04 |
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