CN105610145A - Active full-harmonic arc-extinction control method capable of realizing power feedback, and system therefor - Google Patents

Abstract

The invention relates to the technical field of a control method for arc-extinction equipment, and specifically provides an active full-harmonic arc-extinction control method capable of realizing power feedback, and a system therefor. The method comprises the following steps of 1), executing a three-phase power grid voltage processing method; 2), executing a direct current voltage processing method; and 3) executing a ground fault current compensating method; the system comprises a control module, and a grid-connection voltage sampling module, a grid-connection current sampling module, a direct current voltage sampling module, a power grid side power compensation module and a fault current sampling current that are connected with the control module. Compared with the prior art, the method can realize rapid detection on fundamental reactive current, harmonic reactive current, harmonic active current and fundamental active power, and as well as can fully compensate the fundamental reactive, harmonic reactive and harmonic active current; meanwhile, the active power part can be fed back to the power grid side, so that the compensation speed and accuracy in ground faults can be improved to a large extent, and the operating safety of the power system is greatly improved consequently.

Description

A kind of power can feedback active full harmonic wave extinguishing arc control method and system thereof

Technical field

What the present invention relates to is a kind of control method of extinguishing arc equipment, the active full harmonic wave that in particular a kind of power can feedbackExtinguishing arc control method and system thereof.

Background technology

Along with urbanization process is accelerated, distribution network is generally to large capacity, outgoing lines future development in recent years. City cable networkExtensive use more aggravated the trend of this capacity extension. Meanwhile, constantly the society of progress is also carried power supply reliabilityGone out more and more higher requirement, power supply reliability becomes the major criterion of weighing power supply enterprise's success or not. Under this overall background,Power distribution network mainly adopts neutral by arc extinction coil grounding mode. The electrical network of traditional neutral point resonance grounding as shown in Figure 1, whenWhile there is earth fault, the capacity current IC except bringing due to the distribution capacity of cable in power system₀In addition, also comprise veryThe harmonic current I of large composition_h, and watt current, wherein, active current is mainly the leakage current, zero of power equipmentThe active loss of active loss, corona loss and arc suppression coil in sequence loop etc. causes. The important sources of higher hamonic wave is electricityIn power system, contain the nonlinear load of cored and rectifier cell. And conventionally adopt arc suppression coil, be all passive power frequency reactive currentCompensation arrangement, as its name suggests, i.e. the idle capacitance current component of power frequency in a compensation of ground fault current, and to resistive electric currentAnd high frequency electric, the arc suppression coil of only exporting inductance current is helpless, and this is that current arc suppression coil exists in principleA deficiency. Along with industrialized development, the continuous expansion of distribution network, especially new forms of energy of power electronics converting equipmentThe increase of grid-connection device, this part electric current more and more can not be ignored the pollution that these factors bring and just increasingly sharpens, traditional extinguishing arcDevice does not have compensation ability to this part electric current, unsuccessfully causes arc reignition so be easy to cause compensate, and causes such as tripping operationOr the security incident such as fire. Known by above analysis, when earth fault, the real component in electric current and harmonic component causeHarm can not be ignored. In order to eliminate them, realize full compensation truly, improve the power supply reliability of electrical network, justRequire to adopt the full compensation technique of earth-fault current, the aftercurrent of compensation including watt current and harmonic current. DockingThe full compensation of earth-current requires real component, idle component and harmonic component to compensate in the lump, and obviously only relying on arc suppression coil is notCan meet the demands. And to be one the be widely used in harmonic wave inhibition of active inversion technology, reactive power compensation, alternating current-direct current mix defeatedThe Power Electronic Technique in the fields such as electricity, new-energy grid-connected. The feature of active inverter is can be by the state of testing systemGenerate control instruction, generate compensation waveform by controlling electronic switch. It has overcome passive compensation technique can only compensate fixed frequencyWith the shortcoming of the waveform of amplitude, the waveform that can all change frequency and amplitude is followed the tracks of compensation. Follow owing to self thering is stateTrack, detection and control algolithm, can be as requested compensating reactive power and harmonic components arbitrarily, and can realize the weight of active powerNewly grid-connected, thus real realization entirely compensates. Realize the electrical network feedback of full harmonic compensation and active power, just need a set of suitableClose grid-connected strategy and the fast speed electric current mechanism accurately of fault electrical network.

Summary of the invention

The object of the invention is to overcome the deficiencies in the prior art, the control of the active full harmonic wave extinguishing arc that a kind of power can feedback is providedMethod processed and system thereof, cannot carry out all harmonic currents in earth fault to solve existing electric network fault ground connection extinguishing arc technologyWhole elimination fast, the electric current of active power also cannot carry out the technical problem of electrical network feedback.

The present invention is achieved by the following technical solutions:

The control method that the invention provides the active full harmonic compensation extinguishing arc that a kind of power can feedback, comprises the following steps:

Step S1: the voltage processing method of three phase network

Step S101: by the line voltage U of three phase network_AB、U_BCFirst carry out Clark conversion, then according to three-phase electricity netting twine voltageThe phase angle of ABCarry out Park+, the Park-conversion of positive-negative sequence, obtain the DC voltage component under positive-sequence coordinate systemWith the DC voltage component under negative phase-sequence coordinate system

Step S102: willWithCarry out respectively voltage positive-negative sequence decoupling filtering processing, obtain voltage decoupling value $V_d^P\_Dec,V_q^P\_Dec,V_d^N\_Dec,V_q^N\_Dec;$

Step S103: will $V_q^P\_Dec,V_d^P\_Dec,V_q^N\_Dec,V_d^N\_Dec$ Carry out feed-forward process, obtain space and vowThe fundamental voltage value V of amount pulsewidth modulation SV_PWM_g_FF_d1、V_g_FF_q1；

Step S2: the processing method of DC voltage

Step S201: by actual DC voltage U_DCWith the desirable DC voltage of settingSubtract each other and make proportional integral, just obtainingOrder fundamental active current set-point

Step S202: by the input current I of three phase network_SA、I_SB、I_SCFirst carry out Clark conversion, then according to three phase networkThe phase place of phase voltage ACarry out Park+, the Park-conversion of positive-negative sequence, obtain the direct-current component under positive-sequence coordinate system With the direct-current component under negative phase-sequence coordinate system

Step S203: willWithCarry out respectively electric current positive-negative sequence decoupling filtering processing, obtain electric current decoupling valueWillWithSubtract each other and make proportional integral, obtaining q axle regulation voltage

Step S204: willAnd V_g_ FF_q1 exports in SV_PWM module, produces commutating pulse signal;

Step S3: the compensation method of earth-fault current

Step S301: by offset current I_ZDeduct fault current I₀, be compensated the error amount I of electric current_g；

Step S302: utilize bandpass filter to I_gCarry out respectively the computing of BPF1-BPF50 subharmonic, obtain the harmonic wave electricity of each timeFlow valuve I_En；

Step S303: according to the I of each time_EnAnd corresponding leading angle θ_nCalculate leading current value I_{En_θn}, by each I_{En_θn}Take advantage ofWith the system impedance Z under its overtone order of corresponding time, obtain the reference voltage level V under each harmonic_En; Wherein, described leadingAngle θ_nFor the angle of individual harmonic current lagging voltage, leading angle θ_nBe the intrinsic parameter of system hardware with system impedance Z;

Step S304: by the reference voltage level V of each time_EnBe added, obtain total bucking voltage V_E, by V_EExporting H bridge pulsewidth to adjustsIn H_PWM module processed, produce inversion pulse signal.

In described step S102, willWithCarry out respectively the concrete calculating side of positive-negative sequence decoupling filtering processingMethod is:

$V_q^P\_Dec=V_q^P-V_q^N\_lpout*{\mathrm{cos\θ}}_{VL}^{PN}+V_d^N\_lpout*{\mathrm{sin\θ}}_{VL}^{PN}$

$V_d^P\_Dec=V_d^P-V_q^N\_lpout*{\mathrm{sin\θ}}_{VL}^{PN}-V_d^N\_lpout*{\mathrm{cos\θ}}_{VL}^{PN}$

$V_q^N\_Dec=V_q^N-V_q^P\_lpout*{\mathrm{cos\θ}}_{VL}^{PN}+V_d^P\_lpout*{\mathrm{sin\θ}}_{VL}^{PN}$

$V_d^N\_Dec=V_d^N-V_q^P\_lpout*{\mathrm{sin\θ}}_{VL}^{PN}-V_d^P\_lpout*{\mathrm{cos\θ}}_{VL}^{PN}$

In formula,For first-harmonic negative phase-sequence is to the angle of fundamental positive sequence rotation,ForFilter value,ForFilter value,ForFilter value,ForFilter value; Each filter value is by simple and easy LPFDevice obtains, and circular is:

$V_d^P\_lpout=0.998*V_d^P\_(k-1)+0.002*V_d^P\_k$

$V_q^P\_lpout=0.998*V_q^P\_(k-1)+0.002*V_q^P\_k$

$V_d^N\_lpout=0.998*V_d^N\_(k-1)+0.002*V_d^N\_k$

$V_q^N\_lpout=0.998*V_q^N\_(k-1)+0.002*V_q^N\_k$

In formula,For a upper computing cycleValue,For this computing cycleValue,ForA upper computing cycleValue,For this computing cycleValue,For a upper computing cycleValue,For this computing cycleValue,For a upper computing cycleValue,For this calculatingCycleValue.

In described step S103, the circular of feed-forward process is:

$V_g\_FF\_d1=(V_d^P\_Dec+V_d^N\_Dec*{\mathrm{sin\θ}}_{VL\_CMP}^{PN})/K_{feed\_forword}$

$V_g\_FF\_q1=(V_q^P\_Dec+V_q^N\_Dec*{\mathrm{cos\θ}}_{VL\_CMP}^{PN})/K_{feed\_forword};$

In formula, K_{feed_forword}For feed-forward coefficients,For first-harmonic negative phase-sequence is to the angle of fundamental positive sequence rotation,For proofreading and correctAfter first-harmonic negative phase-sequence to the angle of fundamental positive sequence rotation, initial value isθ_CMPFor the angle school due to sampling and computation delay generationPositive quantity.

In described step S203, the computational methods of electric current positive-negative sequence decoupling processing are specially:

$I_{Sq}^P\_Dec=I_{Sq}^P-I_{Sq}^N*cos2{\mathrm{\θ}}_{VL}^{PN}+I_{Sd}^N*sin2{\mathrm{\θ}}_{VL}^{PN}$

In formula,For first-harmonic negative phase-sequence is to the angle of fundamental positive sequence rotation.

In described step S302, utilize second order Butterworth bandpass filter to I_gCarry out harmonic wave computing, concrete formula is:

I_En＝a₀*I_{En_x}_k+a₁*I_{En_x}_(k-1)+a₂*I_{En_x}_(k-2)+b₁*I_{En_y}_(k-1)+b₂*I_{En_y}_(k-2)

In formula, a₀、a₁、a₂、b₁、b₂For filter coefficient, I_{En_x}_ k is the actual sample value of this computing cycle,I_{En_x}_ (k-1) be the actual sample value of previous computing cycle, I_{En_x}_ (k-2) be the actual sample value of front 2 computing cycles;I_{En_y}_ (k-1) be the filtered value of previous computing cycle, I_{En_y}_ (k-2) be the filtered value of front 2 computing cycles.I_EnInitial value is zero.

The present invention also provides the active full harmonic wave arc-extinguishing system that a kind of power can feedback, comprises control module, and connectedGrid-connected voltage sample module, grid-connected current sampling module, DC voltage sampling module, grid side power back-off module and fault electricityStream sampling module, wherein:

Described grid side power back-off module comprises the rectifier circuit and the inverter bridge circuit that connect successively, described rectifier circuitInput is connected to three phase network by reactance, and the output of described inverter bridge circuit disappears by compensator transformer and three phase networkArc coil series connection;

Described grid-connected voltage sample module is for gathering the line voltage U of three phase network_ABAnd U_BC；

Described grid-connected current sampling module is for gathering the input current I of three phase network_SA、I_SB、I_SC；

Described DC voltage sampling module is used for gathering actual DC voltage U_DC；

Described fault current sampling module is for gathering the fault current I of three phase network₀With offset current I_Z；

The commutating pulse output of described control module is connected with rectifier circuit, and its inversion pulse output end and inverter bridge circuit connectConnect, described control module is according to the line voltage U gathering_ABAnd U_BC, input current I_SA、I_SB、I_SC, actual DC voltage U_DC，Fault current I₀With offset current I_ZProduce commutating pulse signal and inversion pulse signal.

The present invention has the following advantages compared to existing technology: the invention provides active full harmonic wave extinguishing arc that a kind of power can feedbackControl method and system thereof, the method can realize fundamental wave reactive power, harmonic wave is idle, harmonic wave is meritorious, fundamental active current fastDetect, and by fundamental wave reactive power and the idle and meritorious all compensation of harmonic wave, active power part can be fed back to grid side simultaneously,Compensation speed while improving earth fault to a great extent and precision, thus the security of operation that improves widely power system improvedProperty.

Brief description of the drawings

Fig. 1 is the circuit theory diagrams of the active full harmonic compensation arc-extinguishing system that power can feedback;

Fig. 2 is the system architecture diagram of the control method of the active full harmonic compensation extinguishing arc that power can feedback.

Fig. 3-(1) fault phase voltage;

Fig. 3-(2) healthy phases voltage;

The full offset current in Fig. 3-(3);

Fig. 3-(4) harmonic compensation current;

Fig. 3-(5) fundamental active power;

Fig. 3-(6) First Harmonic Reactive Power;

Fig. 4-(1) compensation prior fault electric current;

Aftercurrent after the compensation of Fig. 4-(2).

Detailed description of the invention

Below embodiments of the invention are elaborated, the present embodiment is implemented under taking technical solution of the present invention as prerequisite,Provided detailed embodiment and concrete operating process, but protection scope of the present invention is not limited to following embodiment.

Embodiment 1

The present invention also provides the active full harmonic wave arc-extinguishing system that a kind of power can feedback, has structure as shown in Figure 1, comprisesControl module, and connected grid-connected voltage sample module, grid-connected current sampling module, DC voltage sampling module, electrical networkSide power back-off module and fault current sampling module, wherein:

Described grid side power back-off module comprises the rectifier circuit and the inverter bridge circuit that connect successively, described rectifier circuitInput is connected to three phase network by reactance group L2, and the output of described inverter bridge circuit is by compensator transformer T1 and three-phaseThe arc suppression coil series connection of electrical network;

Described grid-connected voltage sample module comprises two groups of grid-connected voltage sample sensor PT2, PT3, for gathering the line of three phase networkVoltage U_ABAnd U_BC；

Described grid-connected current sampling module comprises three groups of grid-connected current sampling sensor CT2, CT3, CT4, for gathering three-phase electricityThe input current I of net_SA、I_SB、I_SC；

Described DC voltage sampling module comprises DC voltage sampling sensor PT1, described DC voltage sampling sensor PT1'sSignals collecting end is connected to the signal output part of rectifier circuit, for gathering actual DC voltage U_DC；

Described fault current sampling module comprises fault current sampling sensor CT1, CT5, described fault current sampling sensor CT1Signals collecting end be connected to the arc suppression coil L1 of three phase network, for gathering the fault current I of three phase network₀, described fault electricityThe signals collecting end of stream sampling sensor CT5 is connected to the signal output part of inverter bridge circuit, for gathering offset current I_Z；

The commutating pulse output of described control module is connected with rectifier circuit, and its inversion pulse output end and inverter bridge circuit connectConnect, described control module is according to the line voltage U gathering_ABAnd U_BC, input current I_SA、I_SB、I_SC, actual DC voltage U_DC，Fault current I₀With offset current I_ZProduce commutating pulse signal and inversion pulse signal.

Utilize that the active full harmonic compensation arc-extinguishing system that above-mentioned power can feedback can be realized fundamental wave reactive power, harmonic wave is idle, harmonic wave hasThe fast detecting of merit, fundamental active current, and by fundamental wave reactive power and the idle and meritorious all compensation of harmonic wave, simultaneously can be by meritoriousPower section is fed back to grid side, and concrete control method comprises the following steps:

Step S1: the voltage processing method of three phase network

Step S101: by the line voltage U of three phase network_AB、U_BCFirst carry out Clark conversion, then according to three-phase electricity netting twine voltageThe phase angle of ABCarry out Park+, the Park-conversion of positive-negative sequence, obtain the DC voltage component under positive-sequence coordinate systemWith the DC voltage component under negative phase-sequence coordinate system

Step S102: willWithInput to D_Couple module and carry out voltage positive-negative sequence decoupling filtering processing,Obtain voltage decoupling value $V_d^P\_Dec,V_q^P\_Dec,V_d^N\_Dec,V_q^N\_Dec;$ Circular is:

$V_q^P\_Dec=V_q^P-V_q^N\_lpout*{\mathrm{cos\θ}}_{VL}^{PN}+V_d^N\_lpout*{\mathrm{sin\θ}}_{VL}^{PN}$

$V_d^P\_Dec=V_d^P-V_q^N\_lpout*{\mathrm{sin\θ}}_{VL}^{PN}-V_d^N\_lpout*{\mathrm{cos\θ}}_{VL}^{PN}$

$V_q^N\_Dec=V_q^N-V_q^P\_lpout*{\mathrm{cos\θ}}_{VL}^{PN}+V_d^P\_lpout*{\mathrm{sin\θ}}_{VL}^{PN}$

$V_d^N\_Dec=V_d^N-V_q^P\_lpout*{\mathrm{sin\θ}}_{VL}^{PN}-V_d^P\_lpout*{\mathrm{cos\θ}}_{VL}^{PN}$

In formula,For first-harmonic negative phase-sequence is to the angle of fundamental positive sequence rotation,ForFilter value,ForFilter value,ForFilter value,ForFilter value; Each filter value is by simple and easy LPFDevice obtains, and circular is:

$V_d^P\_lpout=0.998*V_d^P\_(k-1)+0.002*V_d^P\_k$

$V_q^P\_lpout=0.998*V_q^P\_(k-1)+0.002*V_q^P\_k$

$V_d^N\_lpout=0.998*V_d^N\_(k-1)+0.002*V_d^N\_k$

$V_q^N\_lpout=0.998*V_q^N\_(k-1)+0.002*V_q^N\_k$

In formula,For a upper computing cycleValue,For this computing cycleValue,ForA upper computing cycleValue,For this computing cycleValue,For a upper computing cycleValue,For this computing cycleValue,For a upper computing cycleValue,For this calculatingCycleValue;

Step S103: will $V_q^P\_Dec,V_d^P\_Dec,V_q^N\_Dec,V_d^N\_Dec$ Inputing to Feedforward module entersRow feed-forward process, obtains the fundamental voltage value V of SV_PWM_g_FF_d1、V_g_ FF_q1, circular is:

$V_g\_FF\_d1=(V_d^P\_Dec+V_d^N\_Dec*{\mathrm{sin\θ}}_{VL\_CMP}^{PN})/K_{feed\_forword}$

$V_g\_FF\_q1=(V_q^P\_Dec+V_q^N\_Dec*{\mathrm{cos\θ}}_{VL\_CMP}^{PN})/K_{feed\_forword}$

In formula, K_{feed_forword}For feed-forward coefficients,For the first-harmonic negative phase-sequence after proofreading and correct is to the angle of fundamental positive sequence rotation, justValue isθ_CMPFor the angle correct amount due to sampling and computation delay generation, be about 2 °.

Step S2: the processing method of DC voltage

Step S201: by actual DC voltage U_DCWith the desirable DC voltage of settingSubtract each other and make proportional integral, just obtainingOrder fundamental active current set-point

Step S202: by the input current I of three phase network_SA、I_SB、I_SCFirst carry out Clark conversion, then according to three phase networkThe phase place of phase voltage ACarry out Park+, the Park-conversion of positive-negative sequence, obtain the direct-current component under positive-sequence coordinate system With the direct-current component under negative phase-sequence coordinate system

Step S203: willWithInput to D_Couple module and carry out electric current positive-negative sequence decoupling filtering processing,Obtain electric current decoupling valueCircular is:

$I_{Sq}^P\_Dec=I_{Sq}^P-I_{Sq}^N*cos2{\mathrm{\θ}}_{VL}^{PN}+I_{Sd}^N*sin2{\mathrm{\θ}}_{VL}^{PN}$

Then, willWithSubtract each other and make proportional integral, obtaining q axle regulation voltage

Step S204: willAnd V_g_ FF_q1 exports in SV_PWM module, produces commutating pulse signal;

Step S3: the compensation method of earth-fault current

Step S301: by offset current I_ZDeduct fault current I₀, be compensated the error amount I of electric current_g；

Step S302: utilize second order Butterworth bandpass filter to I_gCarry out respectively the computing of BPF1-BPF50 subharmonic,Concrete formula is:

I_En＝a₀*I_{En_x}_k+a₁*I_{En_x}_(k-1)+a₂*I_{En_x}_(k-2)+b₁*I_{En_y}_(k-1)+b₂*I_{En_y}_(k-2)

In formula: a₀、a₁、a₂、b₁、b₂For filter coefficient, I_{En_x}_ k is the actual sample value of this computing cycle,I_{En_x}_ (k-1) be the actual sample value of previous computing cycle, I_{En_x}_ (k-2) be the actual sample value of front 2 computing cycles;I_{En_y}_ (k-1) be the filtered value of previous computing cycle, I_{En_y}_ (k-2) be the filtered value of front 2 computing cycles.I_EnInitial value is zero;

Step S303: according to the I of each time_EnAnd corresponding leading angle θ_nCalculate leading current value I_{En_θn}, by each I_{En_θn}Take advantage ofWith the system impedance Z under its overtone order of corresponding time, obtain the reference voltage level V under each harmonic_En; Wherein, described leadingAngle θ_nFor the angle of individual harmonic current lagging voltage, leading angle θ_nBe the intrinsic parameter of system hardware with system impedance Z;

Step S304: by the reference voltage level V of each time_EnBe added, obtain total bucking voltage V_E, by V_EExport H_PWM module toIn, produce inversion pulse signal.

Active full harmonic wave arc-extinguishing system that can feedback taking the power shown in Fig. 1 is as experimental subjects, and system voltage is 10kV, single-phaseDirect-to-ground capacitance is 25uF, and ratio of damping is 10%, supposes that singlephase earth fault occurs the t1 moment, as shown in Figure 3, and Fig. 3-(1)Fault phase voltage, Fig. 3-(2) healthy phases voltage, the full offset current in Fig. 3-(3), and can obtain after full offset current is decomposedFig. 3-(4) harmonic compensation current, Fig. 3-(5) fundamental active power and Fig. 3-(6) First Harmonic Reactive Power; And before the compensation of Fig. 4-(1)After the compensation of fault current and Fig. 4-(2), aftercurrent is relatively rear visible, and this compensation method can be mended most fault currentsRepay, thus fast arc extinction, safeguards system safety.

Claims (6)

1. a control method for the active full harmonic compensation extinguishing arc that power can feedback, is characterized in that, comprises the following steps:

Step S1: the voltage processing method of three phase network

Step S101: by the line voltage U of three phase network_AB、U_BCFirst carry out Clark conversion, then according to three-phase electricity netting twine voltageThe phase angle of ABCarry out Park+, the Park-conversion of positive-negative sequence, obtain the DC voltage component under positive-sequence coordinate systemWith the DC voltage component under negative phase-sequence coordinate system

Step S102: willWithCarry out respectively voltage positive-negative sequence decoupling filtering processing, obtain voltage decoupling value

Step S103: willCarry out feed-forward process, obtain space and vowThe fundamental voltage value V of amount pulsewidth modulation SV_PWM_g_FF_d1、V_g_FF_q1；

Step S2: the processing method of DC voltage

Step S201: by actual DC voltage U_DCWith the desirable DC voltage of settingSubtract each other and make proportional integral, just obtainingOrder fundamental active current set-point

Step S202: by the input current I of three phase network_SA、I_SB、I_SCFirst carry out Clark conversion, then according to three phase networkThe phase place of phase voltage ACarry out Park+, the Park-conversion of positive-negative sequence, obtain the direct-current component under positive-sequence coordinate system With the direct-current component under negative phase-sequence coordinate system

Step S203: willWithCarry out respectively electric current positive-negative sequence decoupling filtering processing, obtain electric current decoupling valueWillWithSubtract each other and make proportional integral, obtaining q axle regulation voltage

Step S204: willAnd V_g_ FF_q1 exports in SV_PWM module, produces commutating pulse signal;

Step S3: the compensation method of earth-fault current

Step S301: by offset current I_ZDeduct fault current I₀, be compensated the error amount I of electric current_g；

Step S302: utilize bandpass filter to I_gCarry out respectively the computing of BPF1-BPF50 subharmonic, obtain the harmonic wave electricity of each timeFlow valuve I_En；

Step S303: according to the I of each time_EnAnd corresponding leading angle θ_nCalculate leading current value I_{En_θn}, by each I_{En_θn}Take advantage ofWith the system impedance Z under its overtone order of corresponding time, obtain the reference voltage level V under each harmonic_En; Wherein, described leadingAngle θ_nFor the angle of individual harmonic current lagging voltage, leading angle θ_nBe the intrinsic parameter of system hardware with system impedance Z;

Step S304: by the reference voltage level V of each time_EnBe added, obtain total bucking voltage V_E, by V_EExporting H bridge pulsewidth to adjustsIn H_PWM module processed, produce inversion pulse signal.

2. the control method of the active full harmonic compensation extinguishing arc that a kind of described power according to claim 1 can feedback, itsBe characterised in that, in step S102, willWithCarry out respectively the concrete calculating of positive-negative sequence decoupling filtering processingMethod is:

$V_q^P\_Dec=V_q^P-V_q^N\_lpout*{\mathrm{cos\θ}}_{VL}^{PN}+V_d^N\_lpout*{\mathrm{sin\θ}}_{VL}^{PN}$

$V_d^P\_Dec=V_d^P-V_q^N\_lpout*{\mathrm{sin\θ}}_{VL}^{PN}-V_d^N\_lpout*{\mathrm{cos\θ}}_{VL}^{PN}$

$V_q^N\_Dec=V_q^N-V_q^P\_lpout*{\mathrm{cos\θ}}_{VL}^{PN}+V_d^P\_lpout*{\mathrm{sin\θ}}_{VL}^{PN}$

$V_d^N\_Dec=V_d^N-V_q^P\_lpout*{\mathrm{sin\θ}}_{VL}^{PN}-V_d^P\_lpout*{\mathrm{cos\θ}}_{VL}^{PN}$

In formula,For first-harmonic negative phase-sequence is to the angle of fundamental positive sequence rotation,ForFilter value,ForFilter value,ForFilter value,ForFilter value; Each filter value is by simple and easy LPFDevice obtains, and circular is:

$V_d^P\_lpout=0.998*V_d^P\_(k-1)+0.002*V_d^P\_k$

$V_q^P\_lpout=0.998*V_q^P\_(k-1)+0.002*V_q^P\_k$

$V_d^N\_lpout=0.998*V_d^N\_(k-1)+0.002*V_d^N\_k$

$V_q^N\_lpout=0.998*V_q^N\_(k-1)+0.002*V_q^N\_k$

In formula,For a upper computing cycleValue,For this computing cycleValue,ForA upper computing cycleValue,For this computing cycleValue,For a upper computing cycleValue,For this computing cycleValue,For a upper computing cycleValue,For this calculatingCycleValue.

3. the control method of the active full harmonic compensation extinguishing arc that a kind of described power according to claim 1 can feedback, itsBe characterised in that, in described step S103, the circular of feed-forward process is:

$V_g\_FF\_d1=(V_d^P\_Dec+V_d^N\_Dec*{\mathrm{sin\θ}}_{VL\_CMP}^{PN})/K_{feed\_forword}$

$V_g\_FF\_q1=(V_q^P\_Dec+V_q^N\_Dec*{\mathrm{cos\θ}}_{VL\_CMP}^{PN})/K_{feed\_forword}$

${\mathrm{\θ}}_{V\stackrel{\‾}{L}\_CMP}^{PN}={\mathrm{\θ}}_{V\stackrel{\‾}{L}\_}^{PN}+{\mathrm{\θ}}_{CMP}$

In formula, K_{feed_forword}For feed-forward coefficients,For first-harmonic negative phase-sequence is to the angle of fundamental positive sequence rotation,For proofreading and correctAfter first-harmonic negative phase-sequence to the angle of fundamental positive sequence rotation, initial value isθ_CMPFor the angle school due to sampling and computation delay generationPositive quantity.

4. the control method of the active full harmonic compensation extinguishing arc that a kind of described power according to claim 1 can feedback, itsBe characterised in that, in described step S203, the computational methods of electric current positive-negative sequence decoupling processing are specially:

$I_{Sq}^P\_Dec=I_{Sq}^P-I_{Sq}^N*cos2{\mathrm{\θ}}_{VL}^{PN}+I_{Sd}^N*sin2{\mathrm{\θ}}_{VL}^{PN}$

In formula,For first-harmonic negative phase-sequence is to the angle of fundamental positive sequence rotation.

5. the control method of the active full harmonic compensation extinguishing arc that a kind of described power according to claim 1 can feedback, itsBe characterised in that, in described step S302, utilize second order Butterworth bandpass filter to I_gCarry out harmonic wave computing, concreteFormula is:

I_En＝a₀*I_{En_x}_k+a₁*I_{En_x}_(k-1)+a₂*I_{En_x}_(k-2)+b₁*I_{En_y}_(k-1)+b₂*I_{En_y}_(k-2)

In formula, a₀、a₁、a₂、b₁、b₂For filter coefficient, I_{En_x}_ k is the actual sample value of this computing cycle,I_{En_x}_ (k-1) be the actual sample value of previous computing cycle, I_{En_x}_ (k-2) be the actual sample value of front 2 computing cycles;I_{En_y}_ (k-1) be the filtered value of previous computing cycle, I_{En_y}_ (k-2) be the filtered value of front 2 computing cycles.I_EnInitial value is zero.

6. the active full harmonic wave arc-extinguishing system that power can feedback, is characterized in that, comprises control module, and connectedGrid-connected voltage sample module, grid-connected current sampling module, DC voltage sampling module, grid side power back-off module and fault electricityStream sampling module, wherein:

Described grid side power back-off module comprises the rectifier circuit and the inverter bridge circuit that connect successively, described rectifier circuitInput is connected to three phase network by reactance, and the output of described inverter bridge circuit disappears by compensator transformer and three phase networkArc coil series connection;

Described grid-connected voltage sample module is for gathering the line voltage U of three phase network_ABAnd U_BC；

Described grid-connected current sampling module is for gathering the input current I of three phase network_SA、I_SB、I_SC；

Described DC voltage sampling module is used for gathering actual DC voltage U_DC；

Described fault current sampling module is for gathering the fault current I of three phase network₀With offset current I_Z；

The commutating pulse output of described control module is connected with rectifier circuit, and its inversion pulse output end and inverter bridge circuit connectConnect, described control module is according to the line voltage U gathering_ABAnd U_BC, input current I_SA、I_SB、I_SC, actual DC voltage U_DC，Fault current I₀With offset current I_ZProduce commutating pulse signal and inversion pulse signal.