CN102591399A - Perturbation and observation method for tracking maximum power point of photovoltaic grid-connected generating system - Google Patents

Perturbation and observation method for tracking maximum power point of photovoltaic grid-connected generating system Download PDF

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CN102591399A
CN102591399A CN2012100226297A CN201210022629A CN102591399A CN 102591399 A CN102591399 A CN 102591399A CN 2012100226297 A CN2012100226297 A CN 2012100226297A CN 201210022629 A CN201210022629 A CN 201210022629A CN 102591399 A CN102591399 A CN 102591399A
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CN102591399B (en
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孙向东
张琦
宋卫章
杨惠
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Xian University of Technology
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    • Y02E10/56—Power conversion systems, e.g. maximum power point trackers

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Abstract

The invention discloses a perturbation and observation method for tracking a maximum power point of a photovoltaic grid-connected generating system, which is characterized in that reference current amplitude value signals of a grid-connected inverter serve as alternative signals of output power of the grid-connected inverter, and a controller is used for perturbing photovoltaic array reference voltage in real time and determining the direction of perturbing photovoltaic array reference voltage for next time according to reference current amplitude value signal change before and after the photovoltaic array reference voltage is perturbed. By means of ring closure of a PI regulator, reference current amplitude value signals of the grid-connected inverter for next time can be also obtained while practical output voltage of a photovoltaic array tracks the reference voltage in real time. Repeatedly, a maximum power point tracking function of the photovoltaic array can be realized by perturbing the voltage, observing the reference current amplitude value signal change and regulating reference voltage of the photovoltaic array and the reference current amplitude value signals of the grid-connected inverter for next time. By the aid of the method, voltage collapse of a direct-current bus and incapability of correctly tracking in weak sunlight are avoided, hardware cost is reduced, and generating power of the photovoltaic array is improved.

Description

Be used to realize the disturbance observation of grid-connected photovoltaic system MPPT maximum power point tracking
Technical field
The invention belongs to the solar photovoltaic technology field, be specifically related to a kind of disturbance observation that is used to realize the grid-connected photovoltaic system MPPT maximum power point tracking.
Background technology
The solar-energy photo-voltaic cell cost is higher relatively, is restricting the fast development of photovoltaic industry.Under the higher prerequisite of hardware cost, how to guarantee the real-time Maximum Power Output of photovoltaic cell, be vital to improving the photovoltaic generating system cost performance.As everyone knows; The characteristics of output power of photovoltaic cell has very strong non-linear; Its peak power output, peak power output point voltage and electric current are along with factors vary such as temperature, intensities of illumination; Have only the effective maximum power point tracing method of employing, could improve the utilization factor of photovoltaic generating system photovoltaic cell output electric energy.
At present, photovoltaic generating system realizes that the method for MPPT maximum power point tracking comprises a variety of methods such as deciding voltage method, disturbance observation, increment conductance method.Document [1] proposes to decide voltage method; It is to be reduced to PI closed loop voltage stabilizing control to MPPT control; Therefore implement very simply, system has good stability, but this method only be suitable for illumination constant basically than the intense light irradiation strength condition; For sooner or later and the violent area of four seasons difference variation then inapplicable, cause that photovoltaic array can only be operated near the maximum power point under a lot of situation.Document [2] has been studied a kind of disturbance observation, near the peak power that this method is followed the trail of fluctuation back and forth maximum power point always.Its another shortcoming is when external environment changes suddenly, and system the perturbation direction mistake takes place sometimes and causes in service out-of-sequencely, judges to obtain wrong tracking direction, even causes the photovoltaic generating system collapse.Document [3] has proposed the increment conductance method, and this method control is accurate, and response speed can be used for external environment and change occasion faster than very fast.It is had relatively high expectations to hardware, and particularly the sampling precision of sensor requires than higher.Simultaneously, the increment conductance method exists tracing step to select the problem of difficulty.
Document [1] W.Swiegers and J.Enslin, An Integrated Maximum Power PointTracker for Photovoltaic Panels.Proceedings of IEEE International Symposiumon Industrial Electronic, 1998; Vol.1, pp.40-44. (this prestige Gus, An Silin; A kind of integrated maximum power point tracing method of photovoltaic panel; The symposium of IEEE International Industry electronics, 1998, the 1 volumes: 40-44.)
Document [2] N.Femia, G.Petrone, G.Spagnuolo, et al.Optimization of perturband observer maximum power point tracking method.IEEE Trans.PowerElectron.; 2005, vol.20, no.4; Pp.963-973. (Fei Miya sends farmland grace, the Si Panu Euro; The optimization of maximum power point tracing method, 2005,20 (4): 963-973.) are observed in disturbance
Literature [3] A.Brambilla, M.Gambarara.A.Garutti, et? Al.New? Approach? Tophotovoltaic? Arrays? Maximum? Power? Point? Tracking.In? Proc.30 th ? Annu.IEEEPower? Electron .. Spec.Conf., 1999, pp.632-637. (Bolam and Geim Balala, Karma Lu Di, etc., photovoltaic maximum power point tracking new method , IEEE power Electronics Specialists Conference,1999:632-637.)
Summary of the invention
The purpose of this invention is to provide a kind of disturbance observation that is used to realize the grid-connected photovoltaic system MPPT maximum power point tracking; Overcome traditional disturbance observation and be prone to cause the shortcoming that correctly to follow the tracks of maximum power point under DC bus-bar voltage collapse and the more weak situation of illumination; Reduce hardware cost, improved the generated output of photovoltaic array.
The technical scheme that the present invention adopted is that a kind of disturbance observation that is used to realize the grid-connected photovoltaic system MPPT maximum power point tracking is characterized in that concrete steps are following:
Step 1: set each initial parameter: photovoltaic array reference voltage V RefWith the central point voltage V in the voltage disturbance scope RefsEquate, and all equal 0.78 times of photovoltaic array output voltage sampled signal V of initial time on-line measurement PvA preceding photovoltaic array reference voltage V RefWith photovoltaic array output voltage sampled signal V PvError signal e V_1=0, the reference current amplitude signal I of a preceding combining inverter Ref_1=0, counting variable j=0, the maximum I that obtains in the disturbance cycle RefValue I m=0; Voltage disturbance amount dV=-1, a preceding voltage disturbance amount dV _ 1=-1, the LOR=-1 of disturbance unit of band direction; Forward disturbance bandwidth J Mx=10; The scale-up factor k of pi regulator p=1, integral coefficient k i=0.01;
Step 2: carry out the photovoltaic array output voltage V PvSampling, this sampled value get into step 3 as photovoltaic array Voltage Feedback value;
Step 3: calculate photovoltaic array output voltage sampled signal V PvWith photovoltaic array reference voltage V RefError signal e v, this error signal gets into step 4 as the input of pi regulator;
Step 4: error in judgement signal e vWhether equal 0,, then carry out step 5 if condition is set up; If condition is false, then carry out step 17;
Step 5: counting variable j increases 1, carry out step 6;
Step 6: judge that whether counting variable j is more than or equal to counting with reference to fiducial value N, if the condition establishment then carry out step 7; If condition is false, then carry out step 17;
Step 7: make counting variable j equal 0, get into step 8;
Step 8: the reference current amplitude signal I that judges current combining inverter RefWhether greater than I m, I mBe the maximum I that obtains in the disturbance cycle RefValue; If condition is set up, then carry out step 9; If condition is false, then carry out step 16;
Step 9: the reference current amplitude signal I of current combining inverter RefValue is composed and is given I m, current photovoltaic array reference voltage V RefCompose the central point voltage V that gives in the voltage disturbance scope Refs, get into step 10;
Step 10: judge whether voltage disturbance amount dV equals 0,, then carry out step 11 if condition is set up; If condition is false, then carry out step 12;
Step 11: according to the reference current amplitude signal I of current combining inverter RefConfirm disturbance bandwidth J Mx, get into step 16;
Step 12: judge that whether voltage disturbance amount dV is more than or equal to forward disturbance bandwidth J Mx,, then carry out step 13 if condition is set up; If condition is false, then carry out step 14;
Step 13: carry out the LOR=-1 of disturbance unit of band direction, get into step 16;
Step 14: judge that whether voltage disturbance amount dV is smaller or equal to negative sense disturbance bandwidth-J Mx,, then carry out step 15 step if condition is set up; If condition is false, then carry out step 16;
Step 15: carry out the LOR=1 of disturbance unit of band direction, get into step 16;
Step 16: calculating voltage disturbance quantity dV=dV _ 1+ LOR and photovoltaic array reference voltage V Ref=V Refs+ dV gets into step 17;
Step 17: utilize pi regulator to calculate the reference current amplitude signal I of current combining inverter Ref=I Ref_1+ k p* (e v-e V_1)+k i* e v, carry out I Ref_1=I RefAnd e V_1=e v
In the step 11, the reference current amplitude signal I of current combining inverter RefLess than 30% o'clock of nominal reference current amplitude signal, disturbance bandwidth J Mx=10; The reference current amplitude signal I of current combining inverter RefBe in the nominal reference current amplitude signal 30% and 60% between the time, disturbance bandwidth J Mx=9; The reference current amplitude signal I of current combining inverter RefBe in the nominal reference current amplitude signal 60% and 80% between the time, disturbance bandwidth J Mx=8; The reference current amplitude signal I of current combining inverter RefGreater than 80% o'clock of nominal reference current amplitude signal, disturbance bandwidth J Mx=7.
The inventive method is with the reference current amplitude signal of the combining inverter substitution signal as the combining inverter output power; Controller carries out disturbance to the photovoltaic array reference voltage in real time; According to the reference current amplitude signal situation of change that causes combining inverter before and after the photovoltaic array voltage disturbance, disturbance is carried out in decision next time to the photovoltaic array reference voltage direction.Through the pi regulator ring closure, when making photovoltaic array actual output voltage real-time follow-up reference voltage, also drawn the reference current amplitude signal of combining inverter next time.So circulation is carried out disturbance voltage, is observed the reference current amplitude signal and change, and regulates the reference current amplitude signal of photovoltaic array reference voltage and combining inverter next time, just can realize the MPPT maximum power point tracking function of photovoltaic array.In addition; The inventive method adopts different disturbance bandwidth according to the reference current amplitude signal grade of different combining inverters; The photovoltaic array reference voltage signal is carried out disturbance, and the reference current magnitude in the observation contrast disturbance bandwidth is to confirm the direction of voltage disturbance next time.
The inventive method replaces calculating the photovoltaic array output power by photovoltaic array output voltage and electric current with the reference current amplitude signal of combining inverter, reduced current sensor, so hardware cost decreases.Because closed-loop control obtains the reference current amplitude signal of combining inverter to photovoltaic array output voltage PI, therefore there is not the quantization error influence of physical quantity digitized sampling, make that the tracking maximum power point is more accurate, improved tracking efficient.Also owing to adopt photovoltaic array output voltage PI closed-loop control, so system crash problem and eliminated the tracking error phenomenon when also having solved the external environment sudden change.
Description of drawings
Fig. 1 is the process flow diagram that the present invention is used to realize the disturbance observation of grid-connected photovoltaic system MPPT maximum power point tracking;
Fig. 2 is the circuit diagram of the inventive method when being applicable to stage photovoltaic single grid-connected system circuit.
Embodiment
Below in conjunction with accompanying drawing and embodiment the present invention is elaborated.
Define following symbol: V RefBe photovoltaic array reference voltage, V PvBe photovoltaic array output voltage sampled signal, e vBe V PvWith V RefError signal, e V_1Be a preceding V RefWith V PvError signal, V RefsBe the central point voltage in the voltage disturbance scope, dV is the voltage disturbance amount, dV _ 1Be a preceding voltage disturbance amount, J MxBe forward disturbance bandwidth ,-J MxBe negative sense disturbance bandwidth, LOR is the disturbance unit of band direction, I RefBe the reference current amplitude signal of current combining inverter, I Ref_1Be the reference current amplitude signal of a preceding combining inverter, I mBe the maximum I that obtains in the disturbance cycle RefValue, j is a counting variable, N counts with reference to fiducial value k pBe scale-up factor, k iIt is integral coefficient.
General thought of the present invention is the photovoltaic array output power of being calculated by photovoltaic array output voltage and electric current with the reference current amplitude signal replacement of combining inverter.With the photovoltaic array output voltage V PvBe the disturbance object, automatically according to different reference current amplitude signal I RefSize adopts different disturbance bandwidth J Mx, to photovoltaic array reference voltage signal V RefCarry out disturbance, and the reference current magnitude in the observation contrast disturbance bandwidth, to confirm the direction of voltage disturbance.Make voltage error e through pi regulator vBe tending towards 0, work as V PvTenacious tracking V RefBack (judging with the counting form of repeatedly delaying time whether system is in stable state) is with reference current amplitude signal I RefInstead of optical photovoltaic array output power is as observed quantity.If this I RefValue is greater than the maximal value I that obtains in the disturbance cycle m, then with I at this moment RefValue is composed and is given I m, simultaneously the voltage V of this moment RefCompose and give V Refs, as the central value of voltage disturbance, then with V RefsBe the basis, continue V RefCarry out the voltage disturbance of disturbance quantity dV, when disturbance quantity dV reaches disturbance upper limit J MxOr disturbance lower limit-J MxThe time, show that system has striden across maximum power point, palpus conversion this moment perturbation direction; If this I RefValue is smaller or equal to I mValue then continues V RefCarry out disturbance.
As shown in Figure 1, the present invention is used to realize the disturbance observation of grid-connected photovoltaic system MPPT maximum power point tracking, and concrete steps are following:
Step 1: set each initial parameter:
Initial time, photovoltaic generating system is off-duty still, and the voltage that the maximum power point that photovoltaic array possibly exported is corresponding is about 0.78 times of photovoltaic array open-circuit voltage, so photovoltaic array reference voltage V RefWith the central point voltage V in the voltage disturbance scope RefsEquate, and all equal 0.78 times of photovoltaic array output voltage sampled signal V of initial time on-line measurement Pv
Because system is in stopped status, so a preceding photovoltaic array reference voltage V RefWith photovoltaic array output voltage sampled signal V PvError signal e V_1=0, the reference current amplitude signal I of a preceding combining inverter Ref_1=0, counting variable j=0, the maximum I that obtains in the disturbance cycle RefValue I m=0.
Because system is operation not; Therefore photovoltaic array voltage is open-circuit voltage values, and this open-circuit voltage values should be carried out the step-down disturbance to photovoltaic array voltage at the beginning greater than the corresponding voltage of photovoltaic array Maximum Power Output point; So voltage disturbance amount dV=-1, a preceding voltage disturbance amount dV _ 1=-1, the LOR=-1 of disturbance unit of band direction.
J MxSize by I RefSize confirm because along with power drop, the I of unit RefVariation can cause the variation of bigger array voltage, so along with power drop, disturbance bandwidth J MxAlso should increase, to cause I thereupon RefVariation, observe relatively thereby be beneficial to, initial time is set forward disturbance bandwidth J usually Mx=10.
According to the difference of system power, the ratio system k of pi regulator pWith integral coefficient k iNeed carry out emulation or experiment obtains, set k usually p=1, k i=0.01 as initial value.
Step 2: the analog to digital conversion through controller is carried out the photovoltaic array output voltage V PvSampling, this sampled value get into step 3 as photovoltaic array Voltage Feedback value.
Step 3: calculate photovoltaic array output voltage sampled signal V PvWith photovoltaic array reference voltage V RefError signal e v, this error signal gets into step 4 as the input of pi regulator.
Step 4: error in judgement signal e vWhether equal 0, it is to judge whether the photovoltaic array actual output voltage follows the tracks of disturbance voltage.If condition is set up, then carry out step 5; If condition is false, then carry out step 17.
Step 5: counting variable j increases 1, and this step plays the effect of counting time-delay, carry out step 6.
Step 6: judge counting variable j whether more than or equal to counting with reference to fiducial value N, this be for etc. after the pending primary voltage disturbance, system gets into the response time of stable state, the size of N is relevant with the capacity of PV dc-link capacitance 20.For example N=10 is the situation bigger to the capacity of PV dc-link capacitance 20, and system response time this moment is longer; N=3 is the less situation of the capacity of PV dc-link capacitance 20, and system response time this moment is shorter.If condition is set up, show that system has been in stable state, then carry out step 7; If condition is false, show that system still is in the dynamic process, then carry out step 17.
Step 7: make counting variable j equal 0, get into step 8.
Step 8: the reference current amplitude signal I that judges current combining inverter RefWhether greater than I m, I mBe the maximum I that obtains in the disturbance cycle RefValue, it is the output power of judging before whether the photovoltaic array current output power is higher than voltage disturbance.If condition is set up, show that the photovoltaic array current output power is big, then carry out step 9; If condition is false, show that the photovoltaic array current output power is little, then carry out step 16.
Step 9: the reference current amplitude signal I of current combining inverter RefValue is composed and is given I m, current photovoltaic array reference voltage V RefCompose the central point voltage V that gives in the voltage disturbance scope Refs, get into step 10.
Step 10: judge whether voltage disturbance amount dV equals 0, it is to judge the current local maximum power point place that whether is in.If condition is set up, show that system is in local maximum power point place, then carry out step 11; If condition is false, show that system is in the tracking peak power process, then carry out step 12.
Step 11: according to the reference current amplitude signal I of current combining inverter RefConfirm disturbance bandwidth J Mx, get into step 16.Wherein, the reference current amplitude signal I of current combining inverter RefLess than 30% o'clock of nominal reference current amplitude signal, disturbance bandwidth J Mx=10; The reference current amplitude signal I of current combining inverter RefBe in the nominal reference current amplitude signal 30% and 60% between the time, disturbance bandwidth J Mx=9; The reference current amplitude signal I of current combining inverter RefBe in the nominal reference current amplitude signal 60% and 80% between the time, disturbance bandwidth J Mx=8; The reference current amplitude signal I of current combining inverter RefGreater than 80% o'clock of nominal reference current amplitude signal, disturbance bandwidth J Mx=7.
Step 12: judge that whether voltage disturbance amount dV is more than or equal to forward disturbance bandwidth J Mx, it is to judge whether forward has striden across maximum power point in system.If condition is set up, show that system has striden across maximum power point, then carry out step 13; If condition is false, then carry out step 14.
Step 13: voltage is promptly carried out the LOR=-1 of disturbance unit of band direction to the direction disturbance that descends, and gets into step 16.
Step 14: judge that whether voltage disturbance amount dV is smaller or equal to negative sense disturbance bandwidth-J Mx, it is to judge whether negative sense has striden across maximum power point in system.If condition is set up, show that system has striden across maximum power point, then carry out step 15 step; If condition is false, then carry out step 16.
Step 15: voltage is promptly carried out the LOR=1 of disturbance unit of band direction to the direction disturbance that raises, and gets into step 16.
Step 16: calculating voltage disturbance quantity dV=dV _ 1+ LOR and photovoltaic array reference voltage V Ref=V Refs+ dV gets into step 17.
Step 17: utilize pi regulator to calculate the reference current amplitude signal I of current combining inverter Ref=I Ref_1+ k p* (e v-e V_1)+k i* e v, carry out I Ref_1=I RefAnd e V_1=e v
Fig. 2 is the circuit diagram of an embodiment of the present invention, and it is a kind of stage photovoltaic single grid-connected system circuit.The positive pole of photovoltaic array 18 connects the anode that power diode 19 is filled in counnter attack; The negative pole of photovoltaic array 18 connects the negative electrode of PV dc-link capacitance 20; The anode of the negative electrode connection PV dc-link capacitance 20 of power diode 19 is filled in counnter attack; The anode of PV dc-link capacitance 20 connects the positive input terminal of DC/AC translation circuit and filtering circuit 21; The negative electrode of PV dc-link capacitance 20 connects the negative input end of DC/AC translation circuit and filtering circuit 21; The output of DC/AC translation circuit and filtering circuit 21 connects single-phase or three phase network 22, and photovoltaic array output voltage sampling sensor 23 connects the anode and the negative electrode two ends of PV dc-link capacitance 20, is used for measuring light photovoltaic array output voltage.
The inventive method need not detect the photovoltaic array output current signal, only the photovoltaic array output voltage is detected, and has therefore reduced hardware cost.
The inventive method both can solve the problem of the tracking error even the total system collapse of the generation under the sudden change environment of traditional disturbance observation.Common disturbance observation needs the output voltage and the output current of sampled light photovoltaic array; Utilize the product of output voltage and output current to calculate the power of photovoltaic array output; Because output voltage and output current all obtain through digital analog to digital conversion sampling; Sampling numerical value is directly related with the analog to digital conversion sampling precision, has certain digitized sampling quantization error so the voltage and current product is an output power, causes maximal power tracing efficient lower.And the reference current amplitude signal of the inventive method combining inverter replaces the photovoltaic array output power by photovoltaic array output voltage and electric current calculating; Closed-loop control obtains the reference current amplitude signal of this combining inverter to photovoltaic array output voltage PI; Therefore there is not the quantization error influence of physical quantity digitized sampling, makes that the tracking maximum power point is more accurate.
The inventive method is specially adapted to the grid-connected photovoltaic system of single stage type circuit structure, can be the single-phase AC system, also can be the three-phase alternating current system, all has extraordinary practical value in the field of photovoltaic power generation of various power grades.

Claims (2)

1. disturbance observation that is used to realize the grid-connected photovoltaic system MPPT maximum power point tracking is characterized in that concrete steps are following:
Step 1: set each initial parameter: photovoltaic array reference voltage V RefWith the central point voltage V in the voltage disturbance scope RefsEquate, and all equal 0.78 times of photovoltaic array output voltage sampled signal V of initial time on-line measurement PvA preceding photovoltaic array reference voltage V RefWith photovoltaic array output voltage sampled signal V PvError signal e V_1=0, the reference current amplitude signal I of a preceding combining inverter Ref_1=0, counting variable j=0, the maximum I that obtains in the disturbance cycle RefValue I m=0; Voltage disturbance amount dV=-1, a preceding voltage disturbance amount dV _ 1=-1, the LOR=-1 of disturbance unit of band direction; Forward disturbance bandwidth J Mx=10; The scale-up factor k of pi regulator p=1, integral coefficient k i=0.01;
Step 2: carry out the photovoltaic array output voltage V PvSampling, this sampled value get into step 3 as photovoltaic array Voltage Feedback value;
Step 3: calculate photovoltaic array output voltage sampled signal V PvWith photovoltaic array reference voltage V RefError signal e v, this error signal gets into step 4 as the input of pi regulator;
Step 4: error in judgement signal e vWhether equal 0,, then carry out step 5 if condition is set up; If condition is false, then carry out step 17;
Step 5: counting variable j increases 1, carry out step 6;
Step 6: judge that whether counting variable j is more than or equal to counting with reference to fiducial value N, if the condition establishment then carry out step 7; If condition is false, then carry out step 17;
Step 7: make counting variable j equal 0, get into step 8;
Step 8: the reference current amplitude signal I that judges current combining inverter RefWhether greater than I m, I mBe the maximum I that obtains in the disturbance cycle RefValue; If condition is set up, then carry out step 9; If condition is false, then carry out step 16;
Step 9: the reference current amplitude signal I of current combining inverter RefValue is composed and is given I m, current photovoltaic array reference voltage V RefCompose the central point voltage V that gives in the voltage disturbance scope Refs, get into step 10;
Step 10: judge whether voltage disturbance amount dV equals 0,, then carry out step 11 if condition is set up; If condition is false, then carry out step 12;
Step 11: according to the reference current amplitude signal I of current combining inverter RefConfirm disturbance bandwidth J Mx, get into step 16;
Step 12: judge that whether voltage disturbance amount dV is more than or equal to forward disturbance bandwidth J Mx,, then carry out step 13 if condition is set up; If condition is false, then carry out step 14;
Step 13: carry out the LOR=-1 of disturbance unit of band direction, get into step 16;
Step 14: judge that whether voltage disturbance amount dV is smaller or equal to negative sense disturbance bandwidth-J Mx,, then carry out step 15 step if condition is set up; If condition is false, then carry out step 16;
Step 15: carry out the LOR=1 of disturbance unit of band direction, get into step 16;
Step 16: calculating voltage disturbance quantity dV=dV _ 1+ LOR and photovoltaic array reference voltage V Ref=v Refs+ dV gets into step 17;
Step 17: utilize pi regulator to calculate the reference current amplitude signal I of current combining inverter Ref=I Ref_1+ k p* (e v-e V_1)+k i* e v, carry out I Ref_1=I RefAnd e V_1=e v
2. according to the described disturbance observation that is used to realize the grid-connected photovoltaic system MPPT maximum power point tracking of claim 1, it is characterized in that, in the step 11, the reference current amplitude signal I of current combining inverter RefLess than 30% o'clock of nominal reference current amplitude signal, disturbance bandwidth J Mx=10; The reference current amplitude signal I of current combining inverter RefBe in the nominal reference current amplitude signal 30% and 60% between the time, disturbance bandwidth J Mx=9; The reference current amplitude signal I of current combining inverter RefBe in the nominal reference current amplitude signal 60% and 80% between the time, disturbance bandwidth J Mx=8; The reference current amplitude signal I of current combining inverter RefGreater than 80% o'clock of nominal reference current amplitude signal, disturbance bandwidth J Mx=7.
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