CN102622035A - Maximum power point tracking control method for photovoltaic inverter - Google Patents
Maximum power point tracking control method for photovoltaic inverter Download PDFInfo
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Abstract
The invention discloses a maximum power point tracking control method for a photovoltaic inverter. The method includes the steps: S1, allowing the voltage of a solar panel to be periodically disturbed in a fixed direction at a large step V_step_big from an open-circuit voltage point oc to a short-circuit point o, and recording power Ppv and operating voltage Vpv in each disturbance; S2, when MPPT (maximum power point tracking) minimum voltage V_min is disturbed, finishing the fixed-direction disturbance, finding out the maximum value Ppv_max of all the recorded power Ppv during disturbance from the point oc to the point V_min and the corresponding voltage value Vpv_max; S3, periodically disturbing at a small step V_step_small with the Vpv_max serving as an initial point to perform maximum power point tracking; and S4, as for the single-way MPPT, judging whether the operating voltage of the solar panel is smaller than the operating voltage of a bus or not in a scanning or searching state. The maximum power point tracking control method integrates MPPT tracking speed and tracking precision, two-way MPPT can be performed at the same time, and the method is applicable to mounting conditions of various solar panels.
Description
Technical field
The present invention relates to a kind of photovoltaic DC-to-AC converter technical field, particularly a kind of control method of photovoltaic DC-to-AC converter MPPT maximum power point tracking.
Background technology
Under a set environment temperature and sun intensity, photovoltaic battery panel can reach peak power output on a specific working point, and like the m point of Fig. 1, this working point just is called " maximum power point ".Different with traditional energy; People always hope that photovoltaic system always can be the peak power output point as the working point; But in fact the maximum power point of sun power can change in the scope of a broad for various reasons; Residing environment temperature of photovoltaic array and intensity of illumination are not only depended in this variation, and the life-span of solar cell and the electrical specification of load also are one of its unsettled reasons.So in order to make it be operated in maximum power point; Between solar panel that output parameter changes and the load that possibly change, need when a kind of the change matching network as interface; This interface also is the MPPT maximum power point tracking network, and common DC/DC (DC-DC) current transformer by switching mode is based on MPPT maximum power point tracking (MPPT; Maximum Power Point Tracking) technology; Realize that through pulse width modulation controlled (PWM, Pulse Width Modulation) method it has guaranteed under the situation of any atmospheric environment and load variations; The photovoltaic permutation can be operated in maximum power point, thereby draws energy from solar panel to greatest extent.
Present most of photovoltaic DC-to-AC converter is MPPT for the multi-string battery plate is connected in parallel.Because the difference of cell panel itself, the difference of irradiation intensity etc., the maximum power point WV of each piece cell panel synchronization can there are differences, so this single channel MPPT can't guarantee respectively to go here and there cell panel accurately and is operated in maximum power point.
Present following principle with " climb the mountain " method is in the majority.Fig. 1 is the curve map of solar panel output voltage and output power." climb the mountain " method is the WV with fixed step size periodic perturbation photovoltaic battery panel, the variation of power.If just being changed to of power, then voltage continues towards present direction disturbance, otherwise voltage disturbance in the opposite direction.The step-length of disturbance selects to have determined precision and the tracking velocity of MPPT.If step-length is bigger, then the variation of voltage is big more in the unit interval, nature, and the time that reaches maximum power point is short more, and tracking velocity is fast more, but the tracking accuracy of this moment is relatively poor; Less disturbance step-length can obtain MPPT precision preferably, but can be slack-off on the speed.Therefore speed and precision are to weigh the good and bad key factor of MPPT controller.
Introduce the technical scheme of a prior art: the single channel method MPPT maximum power point tracking of " climbing the mountain " at present.Consult shown in Figure 1ly, be solar panel PV curve.
The method of " climbing the mountain " is the WV with fixed step size periodic perturbation photovoltaic battery panel, the variation of power.If just being changed to of power, then voltage continues towards present direction disturbance, otherwise voltage disturbance in the opposite direction.
If disturbance last time be with step-length V_step by a to the b disturbance; Then the voltage disturbance direction is for just, and this is operated in the b point, because b point power is greater than a point power; The rate of change that is power is for just; So the positive dirction that this voltage disturbance direction continues last time continues disturbance, through after the disturbance repeatedly, the working point will arrive maximum power point m like this;
If disturbance last time be with step-length V_step by b to a disturbance; Then the voltage disturbance direction is for negative, and this is operated in a point, because a point power is less than b point power; The rate of change that is power is for negative, so this voltage disturbance direction is reverse direction (being that a is to the b direction) disturbance of direction last time;
If disturbance last time be with step-length V_step by d to the c disturbance; Then the voltage disturbance direction is for negative, and this is operated in the c point, because c point power is greater than d point power; The rate of change that is power is for just; So the negative direction that this voltage disturbance direction continues last time continues disturbance, through after the disturbance repeatedly, the working point will arrive maximum power point m like this;
If disturbance last time be with step-length V_step by c to the d disturbance; Then the voltage disturbance direction is for just, and this is operated in the d point, because d point power is less than c point power; The rate of change that is power is for negative, so this voltage disturbance direction is reverse direction (being that d is to the c direction) disturbance of direction last time.
Following shortcoming is arranged in the above-mentioned prior art:
As shown in Figure 1, because " climb the mountain " method is always in disturbance, so after reaching the m point, can not be operated in the m point always, but near an interval m1 the m point, the disturbance that does not stop between the m2.Step-length V_step is big more, and m1, m2 are wide more, and tracking accuracy is low more; Step-length V_step is more little, and m1, m2 are narrow more, and tracking accuracy is high more.
If from oc point beginning disturbance, step-length V_step is big more, disturbance is just short more to the time that m is ordered, but has influenced tracking accuracy; Step-length V_step is more little, though tracking accuracy is guaranteed, needs long time from the disturbance of oc point to the m point.
So the method can not be taken into account MPPT tracking velocity and tracking accuracy.
Therefore, how to design a kind of control method of photovoltaic DC-to-AC converter MPPT maximum power point tracking, be those skilled in the art's research direction place.
Summary of the invention
Fundamental purpose of the present invention provides a kind of control method of photovoltaic DC-to-AC converter MPPT maximum power point tracking, and it is based on two Boost+ inversion topological circuits, and a kind of modified method of " climbing the mountain " is provided, and takes into account MPPT tracking velocity and tracking accuracy; And can be two-way MPPT simultaneously, be suitable for the installation situation of various cell panels.
In order to achieve the above object, the present invention provides a kind of control method of photovoltaic DC-to-AC converter MPPT maximum power point tracking, and it comprises the steps:
Step S1, cell plate voltage begins fixed-direction towards short dot o periodic perturbation from the beginning of open-circuit voltage oc point with big step-length V_step_big, and power P pv and WV Vpv are all noted in each disturbance, and this state is a scanning mode;
Step S2, when disturbance when the MPPT minimum voltage V_min, finish the fixed-direction disturbance, find out by the maximal value Ppv_max of oc point disturbance to the each recording power Ppv of V_min point, with and corresponding voltage value Vpv_max;
Step S3 is a starting point with Vpv_max, advances the V_step_small periodic perturbation with small step, begins to do MPPT maximum power point tracking, and this state is a search condition;
Whether step S4 when said scanning mode, with regard to single channel MPPT, judges the cell panel WV less than the bus WV, like the cell panel WV less than the bus WV, execution in step S6, otherwise execution in step S7;
Whether step S5 when said search condition, judges the cell panel WV less than busbar voltage, like the cell panel WV less than the bus WV, execution in step S8, otherwise execution in step S9;
Step S6, MPPT is controlled by boost control input voltage, is called the PV scanning mode;
Step S7, MPPT is controlled by inversion side control busbar voltage, is called the Bus scanning mode;
Step S8, MPPT is controlled by boost control input voltage, is called the PV search condition;
Step S9, MPPT is controlled by inversion side control busbar voltage, is called the Bus search condition.
In the preferred implementation, in step S3:
If this power is greater than last power, and this WV is greater than voltage last time, and then next WV adds V_step_samll for this WV;
If this power is greater than last power, and this WV is less than voltage last time, and then next WV subtracts V_step_samll for this WV;
If this power is less than last power, and this WV is greater than voltage last time, and then next WV subtracts V_step_samll for this WV;
If this power is less than last power, and this WV is less than voltage last time, and then next WV adds V_step_samll for this WV.
In the preferred implementation, described input voltage is two-way DC input voitage PV1 and PV2, and when PV1 is in the Bus scanning mode:
When if PV2 is in the Bus scanning mode, the PV2 standby, Vbus is given by PV1;
If PV2 is in the PV scanning mode, Vbus is given by PV1;
If PV2 is in Bus when search, let the PV1 standby, Vbus is given by PV2;
If PV2 is in the PV search condition, Vbus is given by PV1.
In the preferred implementation, described input voltage is two-way DC input voitage PV1 and PV2, and when PV1 is in the PV scanning mode:
If when PV2 was in the Bus scanning mode, Vbus was given by PV2;
If PV2 is in the PV scanning mode, Vbus is a fixed value;
If when PV2 was in the Bus search, Vbus was given by PV2;
If PV2 is in the PV search condition, Vbus is a fixed value.
In the preferred implementation, described input voltage is two-way DC input voitage PV1 and PV2, and when PV1 is in the Bus search condition:
When if PV2 is in the Bus scanning mode, the PV2 standby, Vbus is given by PV1;
If PV2 is in the PV scanning mode, Vbus is given by PV1;
If when PV2 is in the Bus search, enter into unified MPPT state, promptly two-way is MPPT as one the tunnel, and Vbus is unified given;
If PV2 is in the PV search condition, Vbus is given by PV1.
In the preferred implementation, described input voltage is two-way DC input voitage PV1 and PV2, and when PV1 is in the PV search condition:
If when PV2 was in the Bus scanning mode, Vbus was given by PV2;
If PV2 is in the PV scanning mode, Vbus is a fixed value;
If when PV2 was in the Bus search, Vbus was given by PV2;
If PV2 is in the PV search condition, Vbus is a fixed value.
In the preferred implementation, the duty of said MPPT is unified MPPT state, PV1PV search PV2BUS search condition, PV1BUS search PV2PV search condition and PV1PV search PV2PV search condition.
In the preferred implementation, when MPPT is in unified MPPT state:
As Vpv1＜650V, switch to PV1PV search PV2BUS search condition;
As Vpv2＜650V, switch to PV1BUS search PV2PV search condition;
As Vpv1＜650V and Vpv2＜650V, switch to PV1PV search PV2PV search condition.
In the preferred implementation, when MPPT is in PV1PV search PV2PV search condition:
As Vpv1＞650V, switch to PV1BUS search PV2PV search condition;
As Vpv2＞650V, switch to PV1PV search PV2BUS search condition;
As Vpv1＞650V and Vpv2＞650V, switch to unified MPPT state.
In the preferred implementation, when MPPT is in PV1BUS search PV2PV search:
As Vpv1＜650V, switch to PV1PV search PV2BUS search condition;
As Vpv2＞650V, switch to PV1BUS search PV2PV search condition.
In the preferred implementation, when MPPT is in PV1PV search PV2BUS search:
As Vpv1＞650V, switch to PV1BUS search PV2PV search condition;
As Vpv2＜650V, switch to PV1PV search PV2BUS search condition.
Compared with prior art, the present invention has following beneficial effect:
1, utilize the approximate range of big step scan maximum power point voltage, improve tracking velocity, the scanning back guarantees enough precision with small step progress row MPPT voltage disturbance.
2, according to the different situations of two-way direct current input, confirm 16 kinds of mode of operations of MPPT, and the conversion between final four kinds of states and the state thereof.
Description of drawings
In order to be illustrated more clearly in the embodiment of the invention or technical scheme of the prior art; To do to introduce simply to the accompanying drawing of required use in embodiment or the description of the Prior Art below; Obviously, the accompanying drawing in describing below only is some embodiments of the present invention, for those of ordinary skills; Under the prerequisite of not paying creative work, can also obtain other accompanying drawing according to these accompanying drawings.
Fig. 1 is a solar panel PV curve;
Fig. 2 is for the present invention is based on two Boost+ inversion topological circuit figure;
Fig. 3 is a MPPT workflow diagram of the present invention;
Fig. 4 transforms figure for MPPT of the present invention.
Embodiment
To combine the accompanying drawing in the embodiment of the invention below, the technical scheme in the embodiment of the invention is carried out clear, intactly description, obviously, described embodiment only is the present invention's part embodiment, rather than whole embodiment.Based on the embodiment among the present invention, those of ordinary skills are not paying the every other embodiment that is obtained under the creative work prerequisite, all belong to the scope of the present invention's protection.
As shown in Figure 2, for the present invention is based on two Boost+ inversion topological circuit figure, the two-way inverter circuit of a kind of photovoltaic DC-to-AC converter of the present invention; It comprises that a photovoltaic DC input voltage PV1 is PV2, and after described photovoltaic DC input voltage PV1 advanced C1 filtering, DC input voitage Vpv1 was input to by inductance L 1; The Boost circuit unit that switching tube S1 and diode D1 form, same, after described photovoltaic DC input voltage PV2 advanced C2 filtering; DC input voitage Vpv2 is input to by inductance L 2; The Boost circuit unit that switching tube S2 and diode D2 form, after process Boost circuit unit boosted, Vpv1 and Vpv2 boosted to Vbus voltage; Be applied to the boost capacitor of forming by C2 and C3, for level full-bridge inverting unit, back provides energy.The three phase full bridge inverter circuit that level full-bridge inverting unit, back is made up of 6 switching tubes; Through controlling the ON time of the switching tube on the different brachium pontis; Can convert the direct current input into contain higher hamonic wave positive device for carrying a tripot alternating current; Pass through the LC filtering circuit again, become with the alternating current of line voltage with homophase frequently after, promptly be output to grid side.
Above-mentioned Vpv1 and Vpv2 are respectively when invertor operation, and (PV1, voltage PV2) promptly are called input voltage 1 (Vpv1) and input voltage 2 (Vpv2), and bus supports capacitance voltage, is called busbar voltage (Vbus) to be added in the two-way direct-flow input end.
Cooperation is simultaneously consulted shown in Figure 1, and the control method of photovoltaic DC-to-AC converter MPPT maximum power point tracking of the present invention may further comprise the steps:
Step S1, the fixed-direction scanning step, promptly cell plate voltage begins from open-circuit voltage oc point; Begin fixed-direction towards short dot o periodic perturbation with big step-length V_step_big; Power P pv and WV Vpv are all noted in each disturbance, and this state is fixed-direction scanning, is called scanning mode.
Step S2, when disturbance when the MPPT minimum voltage V_min, finish the fixed-direction disturbance, find out by the maximal value Ppv_max of oc point disturbance to the each recording power Ppv of V_min point, with and corresponding voltage value Vpv_max;
Step S3, search maximum power point step promptly is starting point with Vpv_max, advances the V_step_small periodic perturbation with small step, begins to do MPPT maximum power point tracking:
A, if this power greater than last power, and this WV is greater than voltage last time, then next WV adds V_step_samll for this WV;
B, if this power greater than last power, and this WV is less than voltage last time, then next WV subtracts V_step_samll for this WV;
C, if this power less than last power, and this WV is greater than voltage last time, then next WV subtracts V_step_samll for this WV;
D, if this power less than last power, and this WV is less than voltage last time, then next WV adds V_step_samll for this WV;
This state is called search condition for the search maximum power point.
Step S4, Bus scanning mode step, with regard to single channel MPPT, when scanning mode, (Vpv＜Vbus), this moment, MPPT was controlled by boost control input voltage, was called the PV scanning mode if the cell panel WV is less than busbar voltage; (Vpv＞Vbus), this moment, MPPT was controlled by inversion side control busbar voltage, was called the Bus scanning mode if the cell panel WV is greater than the bus WV.
Step S5, when search condition, (Vpv＜Vbus), this moment, MPPT was controlled by boost control input voltage, was called the PV search condition if the cell panel WV is less than busbar voltage; (Vpv＞Vbus), this moment, MPPT was controlled by inversion side control busbar voltage, was called the Bus search condition if the cell panel WV is greater than the bus WV.
Therefore, for two-way DC input voitage PV1 and PV2:
When PV1 is in the Bus scanning mode, if when PV2 is in the Bus scanning mode, let the PV2 standby, Vbus is given by PV1;
When PV1 was in the Bus scanning mode, if PV2 is in the PV scanning mode, Vbus was given by PV1;
When PV1 is in the Bus scanning mode, if PV2 is in Bus when search, let the PV1 standby, Vbus is given by PV2;
When PV1 was in the Bus scanning mode, if PV2 is in the PV search condition, Vbus was given by PV1;
When PV1 was in the PV scanning mode, if when PV2 is in the Bus scanning mode, Vbus was given by PV2;
When PV1 was in the PV scanning mode, if PV2 is in the PV scanning mode, Vbus was fixed value (like 650V);
When PV1 was in the PV scanning mode, if PV2 is in Bus when search, Vbus was given by PV2;
When PV1 was in the PV scanning mode, if PV2 is in the PV search condition, Vbus was fixed value (like 650V);
When PV1 is in the Bus search condition, if when PV2 is in the Bus scanning mode, let the PV2 standby, Vbus is given by PV1;
When PV1 was in the Bus search condition, if PV2 is in the PV scanning mode, Vbus was given by PV1;
When PV1 is in the Bus search condition, if PV2 is in Bus when search, enter into unified MPPT state, promptly two-way is MPPT as one the tunnel, and Vbus is unified given;
When PV1 was in the Bus search condition, if PV2 is in the PV search condition, Vbus was given by PV1;
When PV1 was in the PV search condition, if when PV2 is in the Bus scanning mode, Vbus was given by PV2;
When PV1 was in the PV search condition, if PV2 is in the PV scanning mode, Vbus was fixed value (like 650V);
When PV1 was in the PV search condition, if PV2 is in Bus when search, Vbus was given by PV2;
When PV1 was in the PV search condition, if PV2 is in the PV search condition, Vbus was fixed value (like 650V).
The duty of final MPPT is 4 kinds, promptly unified MPPT, PV1PV search PV2BUS search, PV1BUS search PV2PV search, PV1PV search PV2PV search.
Like Fig. 3 and shown in Figure 4; Be MPPT workflow diagram of the present invention and MPPT conversion figure; For unified MPPT, PV1PV search PV2BUS search, PV1BUS search PV2PV search, these four kinds of duties of PV1PV search PV2PV search, above-mentioned four kinds of duties can be changed mutually:
When MPPT is in unified MPPT state,, switch to PV1PV search PV2BUS search as Vpv1＜650V;
When MPPT is in unified MPPT state,, switch to PV1BUS search PV2PV search as Vpv2＜650V;
When MPPT is in unified MPPT state,, switch to PV1PV search PV2PV search as Vpv1＜650V and Vpv2＜650V;
When MPPT is in PV1PV search PV2PV search,, switch to PV1BUS search PV2PV search as Vpv1＞650V;
When MPPT is in PV1PV search PV2PV search,, switch to PV1PV search PV2BUS search as Vpv2＞650V;
When MPPT is in PV1PV search PV2PV search,, switch to unified MPPT state as Vpv1＞650V and Vpv2＞650V;
When MPPT is in PV1BUS search PV2PV search,, switch to PV1PV search PV2BUS search as Vpv1＜650V;
When MPPT is in PV1BUS search PV2PV search,, switch to PV1BUS search PV2PV search as Vpv2＞650V;
When MPPT is in PV1PV search PV2BUS search,, switch to PV1BUS search PV2PV search as Vpv1＞650V;
When MPPT is in PV1PV search PV2BUS search,, switch to PV1PV search PV2BUS search as Vpv2＜650V.
The present invention utilizes photovoltaic battery panel analog power test proof, under various voltage power conditions, tests, and two-way MPPT possesses the tracking velocity that finds maximum power point in 10 seconds and greater than 99.5% tracking accuracy.
In sum, the present invention is in single channel " climb the mountain " improve on the basis of method MPPT, take into account MPPT tracking velocity and tracking accuracy, and can be two-way MPPT simultaneously, be suitable for the installation situation of various cell panels, and have following beneficial effect:
1, utilize the approximate range of big step scan maximum power point voltage, improve tracking velocity, the scanning back guarantees enough precision with small step progress row MPPT voltage disturbance.
2, according to the different situations of two-way direct current input, confirm 16 kinds of mode of operations of MPPT, and the conversion between final four kinds of states and the state thereof.
What should explain at last is: above embodiment is only in order to explaining technical scheme of the present invention, but not to its restriction; Although with reference to previous embodiment the present invention has been carried out detailed explanation, those of ordinary skill in the art is to be understood that: it still can be made amendment to the technical scheme that previous embodiment is put down in writing, and perhaps part technical characterictic wherein is equal to replacement; And these are revised or replacement, do not make the spirit and the scope of the essence disengaging embodiment of the invention technical scheme of relevant art scheme.
Claims (11)
1. the control method of a photovoltaic DC-to-AC converter MPPT maximum power point tracking is characterized in that, it comprises the steps:
Step S1, cell plate voltage begins fixed-direction towards short dot o periodic perturbation from the beginning of open-circuit voltage oc point with big step-length V_step_big, and power P pv and WV Vpv are all noted in each disturbance, and this state is a scanning mode;
Step S2, when disturbance when the MPPT minimum voltage V_min, finish the fixed-direction disturbance, find out by the maximal value Ppv_max of oc point disturbance to the each recording power Ppv of V_min point, with and corresponding voltage value Vpv_max;
Step S3 is a starting point with Vpv_max, advances the V_step_small periodic perturbation with small step, begins to do MPPT maximum power point tracking, and this state is a search condition;
Whether step S4 when said scanning mode, with regard to single channel MPPT, judges the cell panel WV less than the bus WV, like the cell panel WV less than the bus WV, execution in step S6, otherwise execution in step S7;
Whether step S5 when said search condition, judges the cell panel WV less than busbar voltage, like the cell panel WV less than the bus WV, execution in step S8, otherwise execution in step S9;
Step S6, MPPT is controlled by boost control input voltage, is called the PV scanning mode;
Step S7, MPPT is controlled by inversion side control busbar voltage, is called the Bus scanning mode;
Step S8, MPPT is controlled by boost control input voltage, is called the PV search condition;
Step S9, MPPT is controlled by inversion side control busbar voltage, is called the Bus search condition.
2. the control method of a kind of photovoltaic DC-to-AC converter MPPT maximum power point tracking according to claim 1 is characterized in that, in step S3:
If this power is greater than last power, and this WV is greater than voltage last time, and then next WV adds V_step_samll for this WV;
If this power is greater than last power, and this WV is less than voltage last time, and then next WV subtracts V_step_samll for this WV;
If this power is less than last power, and this WV is greater than voltage last time, and then next WV subtracts V_step_samll for this WV;
If this power is less than last power, and this WV is less than voltage last time, and then next WV adds V_step_samll for this WV.
3. the control method of a kind of photovoltaic DC-to-AC converter MPPT maximum power point tracking according to claim 1 is characterized in that, described input voltage is two-way DC input voitage PV1 and PV2, and when PV1 is in the Bus scanning mode:
When if PV2 is in the Bus scanning mode, the PV2 standby, Vbus is given by PV1;
If PV2 is in the PV scanning mode, Vbus is given by PV1;
If PV2 is in Bus when search, let the PV1 standby, Vbus is given by PV2;
If PV2 is in the PV search condition, Vbus is given by PV1.
4. the control method of a kind of photovoltaic DC-to-AC converter MPPT maximum power point tracking according to claim 1 is characterized in that, described input voltage is two-way DC input voitage PV1 and PV2, and when PV1 is in the PV scanning mode:
If when PV2 was in the Bus scanning mode, Vbus was given by PV2;
If PV2 is in the PV scanning mode, Vbus is a fixed value;
If when PV2 was in the Bus search, Vbus was given by PV2;
If PV2 is in the PV search condition, Vbus is a fixed value.
5. the control method of a kind of photovoltaic DC-to-AC converter MPPT maximum power point tracking according to claim 1 is characterized in that, described input voltage is two-way DC input voitage PV1 and PV2, and when PV1 is in the Bus search condition:
When if PV2 is in the Bus scanning mode, the PV2 standby, Vbus is given by PV1;
If PV2 is in the PV scanning mode, Vbus is given by PV1;
If when PV2 is in the Bus search, enter into unified MPPT state, promptly two-way is MPPT as one the tunnel, and Vbus is unified given;
If PV2 is in the PV search condition, Vbus is given by PV1.
6. the control method of a kind of photovoltaic DC-to-AC converter MPPT maximum power point tracking according to claim 1 is characterized in that, described input voltage is two-way DC input voitage PV1 and PV2, and when PV1 is in the PV search condition:
If when PV2 was in the Bus scanning mode, Vbus was given by PV2;
If PV2 is in the PV scanning mode, Vbus is a fixed value;
If when PV2 was in the Bus search, Vbus was given by PV2;
If PV2 is in the PV search condition, Vbus is a fixed value.
7. the control method of a kind of photovoltaic DC-to-AC converter MPPT maximum power point tracking according to claim 1; It is characterized in that; The duty of said MPPT is unified MPPT state, PV1PV search PV2BUS search condition, PV1BUS search PV2PV search condition and PV1PV search PV2PV search condition.
8. the control method of a kind of photovoltaic DC-to-AC converter MPPT maximum power point tracking according to claim 7 is characterized in that, when MPPT is in unified MPPT state:
As Vpv1＜650V, switch to PV1PV search PV2BUS search condition;
As Vpv2＜650V, switch to PV1BUS search PV2PV search condition;
As Vpv1＜650V and Vpv2＜650V, switch to PV1PV search PV2PV search condition.
9. the control method of a kind of photovoltaic DC-to-AC converter MPPT maximum power point tracking according to claim 7 is characterized in that, when MPPT is in PV1PV search PV2PV search condition:
As Vpv1＞650V, switch to PV1BUS search PV2PV search condition;
As Vpv2＞650V, switch to PV1PV search PV2BUS search condition;
As Vpv1＞650V and Vpv2＞650V, switch to unified MPPT state.
10. the control method of a kind of photovoltaic DC-to-AC converter MPPT maximum power point tracking according to claim 7 is characterized in that, when MPPT is in PV1BUS search PV2PV search:
As Vpv1＜650V, switch to PV1PV search PV2BUS search condition;
As Vpv2＞650V, switch to PV1BUS search PV2PV search condition.
11. the control method of a kind of photovoltaic DC-to-AC converter MPPT maximum power point tracking according to claim 7 is characterized in that, when MPPT is in PV1PV search PV2BUS search:
As Vpv1＞650V, switch to PV1BUS search PV2PV search condition;
As Vpv2＜650V, switch to PV1PV search PV2BUS search condition.
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