CN103795086B - A kind of micro-electrical network islet operation turns the voltage synchronization detecting method being again incorporated into the power networks - Google Patents
A kind of micro-electrical network islet operation turns the voltage synchronization detecting method being again incorporated into the power networks Download PDFInfo
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Abstract
The invention discloses a kind of micro-electrical network islet operation and turn 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.
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 turnThe voltage being incorporated into the power networks synchronization detecting method again.
Background technology
Along with country constantly increases the demand of clean energy resource generating, intermittent regenerative resourceGrid-connected gradually by society is accepted, but due to the grid-connected permeability of regenerative resource constantly expandingIntermittence and scheduling and stable produce of fluctuation to electrical network of single regenerative resource are bornFace rings, at present. Adopt the mode of intelligent micro-grid, by intermittent renewable power supply and load,Energy-storage units is integrated into a system, makes micro-electrical network become a considerable controlled intelligence in electrical networkEnergy unit, meanwhile, in the time of outside electric network fault, can provide uninterrupted for user in micro-electrical networkSustainable electric power, can reduce and even solve the intermittent power supply band of intermittent regenerative resource greatlyThe destabilizing factor of coming.
At present, micro-electrical network can grid-connected or lonely network operation, when micro-electrical network turns grid-connected by islet operationWhen operation, need to ensure microgrid point of common coupling isolated island side and large grid side voltage Complete Synchronization, logicalNormal employing by the mode of energy accumulation current converter secondary side expansion voltage detecting detected and brought into synchronously, butBe this detection method for the manager and integrator of micro-electrical network, belong to indirect detection, andIn the time existing many energy-storage units in parallel, lack unified foundation, improve the complexity detecting,Thereby reduce 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 and turn grid-connected by islet operationWhen operation, conventionally adopt by the mode of energy accumulation current converter secondary side expansion voltage detecting and detect bandEnter 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, its featureBe: 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 networkIslet operation turns voltage magnitude decision threshold U, the angle decision threshold θ and the minimum that are incorporated into the power networksDuration decision threshold t;
Step (2), gathers micro-electrical network point of common coupling by over-extraction sample measurement and control unit real-time synchronizationInside and outside both sides three-phase voltage parameter;
Step (3), reads three-phase voltage U a1, Ub1 inside micro-electrical network point of common coupling, Uc1And three-phase voltage U a2, Ub2, Uc2 outside micro-electrical network point of common coupling;
Step (4), calculates respectively voltage inside micro-electrical network point of common coupling according to software phase-lock loopVoltage magnitude U1, angle θ 1 and voltage magnitude U2, the angle θ 2 of outside voltage;
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 be greater than minimum durationDecision threshold t, carries out micro-electrical network islet operation and turns and be incorporated into the power networks, otherwise, stop micro-electrical networkIslet operation turns and is 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,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,It is characterized in that: step (4) is calculated respectively micro-electrical network point of common coupling according to software phase-lock loopThe voltage magnitude U1, the method for angle θ 1 of inner side voltage be,
(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 under synchronous rotating framePhase voltage vectorFor
Wherein, U1dFor inner side three-phase voltage vectorD axle component, U1qFor inner side three-phaseVoltage vectorQ axle component;
(2) pass through inner side three-phase voltage vectorAsk mould to calculate, obtain the public coupling of micro-electrical networkThe voltage magnitude U1 of voltage inside chalaza;
(3) by inner side three-phase voltage vectorQ axle component U1q, 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 angle of a upper control cycle PI controller output inner side three-phase voltageSpeed; U1q[n] and U1q[n-1] be respectively the inner side three-phase of a current and upper control cycle outputVoltage vectorQ 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 integrationDevice, then asks mould to twice pi, according to formula (3), obtains micro-electrical network point of common couplingThe angle θ 1 of inner side voltage,
θ1[n]=(θ1[n-1]+Tc*ω[n])mod(2π)(3)
Wherein, θ1[n] is current control cycle angle output valve, i.e. micro-electrical network point of common coupling inner sideThe angle θ 1 of voltage, θ1[n-1] is a upper control cycle angle output valve, TcFor control cycle.
Aforesaid a kind of micro-electrical network islet operation turns the voltage synchronization detecting method being again incorporated into the power networks,It is characterized in that: step (4) is calculated respectively micro-electrical network point of common coupling according to software phase-lock loopThe voltage magnitude U2, the method for angle θ 2 of outside voltage be,
(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 under synchronous rotating framePhase voltage vectorFor,
Wherein, U2dFor outside three-phase voltage vectorD axle component, U2qFor outside three-phaseVoltage vectorQ axle component;
(2) pass through outside three-phase voltage vectorAsk mould to calculate, obtain the public coupling of micro-electrical networkThe voltage magnitude U2 of voltage outside chalaza;
(3) by outside three-phase voltage vectorQ axle component U2q, 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]+kp(U2q[n]-U2q[n-1])+ki*U2q[n]（5）
Wherein, ω ' [n-1] is a upper control cycle PI controller output outside three-phase voltageAngular speed; U2q[n] and U2q[n-1] be respectively the outside three of a current and upper control cycle outputPhase voltage vectorQ axle component; Kp and ki are respectively ratio and the integration of PI controllerCoefficient;
(4) by the angular velocity omega of PI controller output outside three-phase voltage ' [n-1], through numeralIntegrator, then asks mould to twice pi, according to formula (6), obtains the public coupling of micro-electrical networkThe angle θ 2 of voltage outside chalaza,
θ2[n]=(θ2[n-1]+Tc*ω[n])mod(2π)(6)
Wherein, θ2[n] is current control cycle angle output valve, i.e. micro-electrical network point of common coupling inner sideThe angle θ 2 of voltage, θ2[n-1] is a upper control cycle angle output valve, TcFor control cycle.
The invention has the beneficial effects as follows: micro-electrical network islet operation of the present invention turns the electricity being incorporated into the power networksPress synchronization detecting method again, adopt the super sampling unit pair that reaches as high as 10kHz sample frequencyMicro-electrical network point of common coupling both sides three-phase voltage continues sampling, then counts in real time by software phase-lock loopCalculate both sides voltage and angle, judge that by the extent of contrast both sides level angle micro-electrical network isNo satisfied synchronous grid-connected condition again, for the synchronous grid-connected detection criteria that provides again of micro-electrical network, makesComplicated micro-electrical network, in the time that energy-storage units breaks down, still can effectively be judged grid-connected condition, for multipleAssorted micro-electrical network provides the foundation of objective redundancy in lonely net turns the process of being incorporated into the power networks, and avoids because of energy storageUnit inspection fault causes the generation of asynchronous grid-connected situation, and thinking novelty is safe and reliable, toolThere is good application prospect.
Brief description of the drawings
Fig. 1 is that micro-electrical network islet operation of the present invention turns the voltage synchronously detection again of being incorporated into the power networksThe flow chart of method.
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 voltage inside micro-electrical network point of common coupling according to software phase-lock loop to Fig. 3Voltage magnitude, the system block diagram of angle.
To be the present invention calculate voltage outside micro-electrical network point of common coupling according to software phase-lock loop to Fig. 4Voltage magnitude, the system block diagram of angle.
Detailed description of the invention
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 synchronous detection side again of being incorporated into the power networksMethod, is characterized in that: comprises 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 networkIslet operation turns voltage magnitude decision threshold U, the angle decision threshold θ and the minimum that are incorporated into the power networksDuration decision threshold t; Owing to there is no at present relevant pressure standard, each threshold value can be by engineeringTeacher sets according to the adjustment of field condition demand, and acquiescence preset value can be established voltage magnitude decision threshold UFor 3%Un (Un is grid-connected side rated voltage), angle decision threshold θ is 1% π, and t is 0.1Second;
Step (2), gathers micro-electrical network point of common coupling by over-extraction sample measurement and control unit real-time synchronizationInside and outside both sides three-phase voltage parameter;
Step (3), reads three-phase voltage U a1, Ub1 inside micro-electrical network point of common coupling, Uc1And three-phase voltage U a2, Ub2, Uc2 outside micro-electrical network point of common coupling;
Step (4), calculates respectively voltage inside micro-electrical network point of common coupling according to software phase-lock loopVoltage magnitude U1, angle θ 1 and voltage magnitude U2, the angle θ 2 of outside voltage, itsIn, calculate the voltage magnitude U1 of voltage inside micro-electrical network point of common coupling, the mistake of angle θ 1Journey, 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 under synchronous rotating framePhase voltage vectorFor
Wherein, U1dFor inner side three-phase voltage vectorD axle component, U1qFor inner side three-phaseVoltage vectorQ axle component;
2) pass through inner side three-phase voltage vectorAsk mould to calculate, obtain the public coupling of micro-electrical networkThe voltage magnitude U1 of some inner side voltage;
3) by inner side three-phase voltage vectorQ axle component U1q, send into PI controller, rootAccording 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 angle of a upper control cycle PI controller output inner side three-phase voltageSpeed; U1q[n] and U1q[n-1] be respectively the inner side three-phase of a current and upper control cycle outputVoltage vectorQ 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 pi is asked to mould, according to formula (3), obtain micro-electrical network point of common coupling inner sideThe angle θ 1 of voltage,
θ1[n]=(θ1[n-1]+Tc*ω[n])mod(2π)(3)
Wherein, θ1[n] is current control cycle angle output valve, i.e. micro-electrical network point of common coupling inner sideThe angle θ 1 of voltage, θ1[n-1] is a upper control cycle angle output valve, TcFor control cycle,When calculating, π is pi, retains 6 position effective digitals;
Calculate the voltage magnitude U2 of voltage outside micro-electrical network point of common coupling, the mistake of angle θ 2Journey, method and the voltage magnitude U1, the angle θ 1 that calculate voltage inside micro-electrical network point of common couplingProcess similar, 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 under synchronous rotating framePhase voltage vectorFor,
Wherein, U2dFor outside three-phase voltage vectorD axle component, U2qFor outside three-phaseVoltage vectorQ axle component;
2) pass through outside three-phase voltage vectorAsk mould to calculate, obtain the public coupling of micro-electrical networkThe voltage magnitude U2 of some outside voltage;
3) by outside three-phase voltage vectorQ axle component U2q, send into PI controller, rootAccording to formula (5), the angular velocity omega of PI controller output inner side three-phase voltage ' [n],
ω’[n]=ω’[n-1]+kp(U2q[n]-U2q[n-1])+ki*U2q[n]（5）
Wherein, ω ' [n-1] is a upper control cycle PI controller output outside three-phase voltageAngular speed; U2q[n] and U2q[n-1] be respectively the outside three of a current and upper control cycle outputPhase voltage vectorQ axle component; Kp and ki are respectively ratio and the integration of PI controllerCoefficient;
4) by the angular velocity omega of PI controller output outside three-phase voltage ' [n-1], long-pending through numeralDivide device, then twice pi is asked to mould, according to formula (6), obtain the public coupling of micro-electrical networkThe angle θ 2 of some outside voltage,
θ2[n]=(θ2[n-1]+Tc*ω[n])mod(2π)(6)
Wherein, θ2[n] is current control cycle angle output valve, i.e. micro-electrical network point of common coupling inner sideThe angle θ 2 of voltage, θ2[n-1] is a upper control cycle angle output valve, TcFor control cycle,When calculating, π is pi, 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 be greater than minimum durationDecision threshold t, carries out micro-electrical network islet operation and turns and be incorporated into the power networks, otherwise, stop micro-electrical networkIslet operation turns and is 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, in PLC over-extraction sample microgridIt is the sampling clock of 10kHz that centre controller can provide sample frequency, and is provided with 4 road USBInterface, 2 road Ethernet interfaces, 2 road serial interfaces, it is super that over-extraction sample measurement and control unit is plugged on PLCOn the slot of sampling microgrid central controller, slot quantity can be expanded, and can be used for multiple small-sizedThe islet operation of micro-electrical network turns the detection of being incorporated into the power networks.
In sum, micro-electrical network islet operation of the present invention turns the voltage synchronously inspection again of being incorporated into the power networksSurvey method, adopts that to reach as high as the super sampling unit of 10kHz sample frequency public to micro-electrical networkCoupling point both sides three-phase voltage continues sampling, then calculates in real time both sides voltage by software phase-lock loopAnd angle, judge by the extent of contrast both sides level angle whether micro-electrical network meets again sameWalk grid-connected condition, for the synchronous grid-connected detection criteria that provides again of micro-electrical network, make complicated micro-electrical networkIn the time that energy-storage units breaks down, still can effectively judge grid-connected condition, for the micro-electrical network of complexity existsLonely net turns the foundation that objective redundancy is provided in the process of being incorporated into the power networks, and avoids detecting event because of energy-storage unitsBarrier causes the generation of asynchronous grid-connected situation, and thinking novelty is safe and reliable, has good answeringUse prospect.
More than show and described general principle of the present invention, principal character and advantage. The industryTechnical staff should understand, the present invention is not restricted to the described embodiments, above-described embodiment andThat in description, describes just illustrates principle of the present invention, is not departing from spirit and scope of the inventionPrerequisite under, the present invention also has various changes and modifications, these changes and improvements all fall into wantAsk in the scope of the invention of protection. The claimed scope of the present invention by appending claims andIts equivalent defines.
Claims (2)
1. micro-electrical network islet operation turns the voltage synchronization detecting method being again incorporated into the power networks, itsBe characterised 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 networkIslet operation turns voltage magnitude decision threshold U, the angle decision threshold θ and the minimum that are incorporated into the power networksDuration decision threshold t;
Step (2), gathers micro-electrical network point of common coupling by over-extraction sample measurement and control unit real-time synchronizationInside and outside both sides three-phase voltage parameter;
Step (3), reads three-phase voltage U a1, Ub1 inside micro-electrical network point of common coupling, Uc1And three-phase voltage U a2, Ub2, Uc2 outside micro-electrical network point of common coupling;
Step (4), calculates respectively voltage inside micro-electrical network point of common coupling according to software phase-lock loopVoltage magnitude U1, angle θ 1 and voltage magnitude U2, the angle θ 2 of outside voltage;
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 be greater than minimum durationDecision threshold t, carries out micro-electrical network islet operation and turns and be incorporated into the power networks, otherwise, stop micro-electrical networkIslet operation turns and is incorporated into the power networks;
Step (4) is calculated respectively voltage inside micro-electrical network point of common coupling according to software phase-lock loopVoltage magnitude U1, the method for angle θ 1 be,
(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 under synchronous rotating framePhase voltage vectorFor
Wherein, U1dFor inner side three-phase voltage vectorD axle component, U1qFor inner side three-phaseVoltage vectorQ axle component;
(2) pass through inner side three-phase voltage vectorAsk mould to calculate, obtain the public coupling of micro-electrical networkThe voltage magnitude U1 of voltage inside chalaza;
(3) by inner side three-phase voltage vectorQ axle component U1q, 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 angle of a upper control cycle PI controller output inner side three-phase voltageSpeed; U1q[n] and U1q[n-1] be respectively the inner side three-phase of a current and upper control cycle outputVoltage vectorQ 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 integrationDevice, then asks mould to twice pi, according to formula (3), obtains micro-electrical network point of common couplingThe angle θ 1 of inner side voltage,
θ1[n]＝(θ1[n-1]+Tc*ω[n])mod(2π)(3)
Wherein, θ1[n] is current control cycle angle output valve, i.e. micro-electrical network point of common coupling inner sideThe angle θ 1 of voltage, θ1[n-1] is a upper control cycle angle output valve, TcFor control cycle;
Step (4) is calculated respectively voltage outside micro-electrical network point of common coupling according to software phase-lock loopVoltage magnitude U2, the method for angle θ 2 be,
(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 under synchronous rotating framePhase voltage vectorFor,
Wherein, U2dFor outside three-phase voltage vectorD axle component, U2qFor outside three-phaseVoltage vectorQ axle component;
(2) pass through outside three-phase voltage vectorAsk mould to calculate, obtain the public coupling of micro-electrical networkThe voltage magnitude U2 of voltage outside chalaza;
(3) by outside three-phase voltage vectorQ axle component U2q, 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]+kp(U2q[n]-U2q[n-1])+ki*U2q[n](5)
Wherein, ω ' [n-1] is a upper control cycle PI controller output outside three-phase voltageAngular speed; U2q[n] and U2q[n-1] be respectively the outside three of a current and upper control cycle outputPhase voltage vectorQ axle component; Kp and ki are respectively ratio and the integration of PI controllerCoefficient;
(4) by the angular velocity omega of PI controller output outside three-phase voltage ' [n-1], through numeralIntegrator, then asks mould to twice pi, according to formula (6), obtains the public coupling of micro-electrical networkThe angle θ 2 of voltage outside chalaza,
θ2[n]＝(θ2[n-1]+Tc*ω[n])mod(2π)(6)
Wherein, θ2[n] is current control cycle angle output valve, i.e. micro-electrical network point of common coupling inner sideThe angle θ 2 of voltage, θ2[n-1] is a upper control cycle angle output valve, TcFor control cycle.
2. a kind of micro-electrical network islet operation according to claim 1 turns the electricity being incorporated into the power networksPress synchronization detecting method again, it is characterized in that: the described over-extraction sample of step (2) measurement and control unitSample frequency is 10kHz.
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