CN203535465U - Two-level maximum power point tracking (MPPT) collaborative control system based on efficient adaptive perturbation and observation method - Google Patents
Two-level maximum power point tracking (MPPT) collaborative control system based on efficient adaptive perturbation and observation method Download PDFInfo
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- CN203535465U CN203535465U CN201320705210.1U CN201320705210U CN203535465U CN 203535465 U CN203535465 U CN 203535465U CN 201320705210 U CN201320705210 U CN 201320705210U CN 203535465 U CN203535465 U CN 203535465U
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Abstract
A two-level MPPT collaborative control system based on an efficient adaptive perturbation and observation method is characterized in that a boost circuit is connected with a solar cell panel, and a MPPT controller is connected with the boost circuit with the help of a second perturbation execution circuit, acquires the voltage and current signals of the solar cell panel, a DC bus and a power grid, and outputs signals to a first perturbation execution circuit and the second perturbation execution circuit separately after comparison and processing. The technical effects of the utility model are that: an H-bridge inverter circuit and the boost circuit are in collaborative control, so that the boost circuit and the H-bridge inverter circuit both can carry out the MPPT control; the free seamless switching can be carried out according to the actual DC input voltages and the voltage conditions of the power grid; the structure is simple, the cost is low, the tracking voltage range of the MPPT controller is wide, and the precision is high; the conversion efficiency of the solar cell panel is improved.
Description
Technical field
The utility model belongs to photovoltaic power generation technology field, relates to a kind of control system, particularly the cooperative control system of the two-stage MPPT based on efficient self-adapted disturbance observation.
Background technology
Day by day exhausted along with the energy, because solar energy power generating has pollution-free, noiseless, aboundresources, can regenerate, is subject to hardly the factor of merits such as regional limits, so be day by day subject to the attention of various countries.The current subject matter of photovoltaic system is that the conversion efficiency of photovoltaic battery panel is low and expensive, output current-the voltage of photovoltaic battery panel (I-U) curve and voltage-power (U-P) curve have non-linear, have maximum power point, and its maximum power point is along with factors vary such as intensity of sunshine and cell panel temperature.
In order to make full use of the electric energy of solar panel output, reduce the cost of unit generated energy, will realize by Power Electronic Technique and control technology the maximal power tracing of photovoltaic generation, make system when solar radiation, surrounding environment change, still possess peak power output ability, make whole charging system keep best output usefulness state.
But existing control system, tracking accuracy to maximum power point is lower, make the conversion efficiency of solar panel lower, power loss is larger, and existing disturbance observation is to adopt fixed step size to carry out disturbance control, its response speed is slow, is only suitable for changing very slow occasion in intensity of illumination.Under stable situation, this algorithm easily causes near real work point oscillation on small scale maximum power point of solar panel, causes certain power loss; And when intensity of illumination occurs to change fast, track algorithm may lose efficacy, and produced the misjudgment of tracking direction.
Summary of the invention
The utility model is in order to solve the deficiencies in the prior art, designed the two-stage MPPT cooperative control system based on efficient self-adapted disturbance observation, simple in structure, with low cost, H bridge inverter circuit and Boost booster circuit Collaborative Control, the floating voltage wide ranges of MPPT controller, precision are high, make system when solar radiation, surrounding environment change, still possess peak power output ability, make whole charging system keep best output usefulness state, the conversion efficiency that has improved solar panel, has reduced power loss.
The concrete technical scheme that the utility model adopts is: the two-stage MPPT cooperative control system based on efficient self-adapted disturbance observation, comprise the H bridge inverter circuit being connected with electrical network, the MPPT controller being connected with electrical network with solar panel, MPPT controller is connected with H bridge inverter circuit by the first disturbance executive circuit, key is: described control system also comprises the Boost booster circuit being connected with H bridge inverter circuit by DC bus, Boost booster circuit is connected with solar panel, MPPT controller is connected with Boost booster circuit by the second disturbance executive circuit, MPPT controller gathers solar panel, DC bus, the voltage and current signal of electrical network, after relatively processing, output signal to respectively the first disturbance executive circuit and the second disturbance executive circuit.
The beneficial effects of the utility model are: H bridge inverter circuit and Boost booster circuit Collaborative Control, both can realize Boost booster circuit and carry out MPPT control, can realize again H bridge inverter circuit and carry out MPPT control, can carry out free seamless switching according to actual DC input voltage and line voltage situation, simple in structure, with low cost, the floating voltage wide ranges of MPPT controller, precision are high, make system when solar radiation, surrounding environment change, still possess peak power output ability, keep best output usefulness state.
Adopt self-adaptation dutycycle direct perturbation to carry out MPPT control, by introducing the automatic on-line adjustment of step-length coefficient, solve the problem that traditional dutycycle method of perturbation step sizes is difficult to selection.Adopt adaptive voltage variable step method of perturbation to carry out MPPT control, by introducing the automatic on-line of step-length coefficient, adjust, can guarantee good dynamic response and the steady-state behaviour of MPPT maximal power tracing, thereby improve the conversion efficiency of solar panel.Only need judgement power deviation symbol continuously, need the variable number of judgement to reduce, method is simple, reliable, has improved the stability of control system, has reduced the power loss of solar panel.
In control system, add the symbol decision to double power deviation, can effectively avoid the error in judgement of power change direction, improved the precision of MPPT maximum power point tracking.
Utilize the voltage of tertiary voltage Acquisition Circuit on can Real-Time Monitoring DC bus, make MPPT controller make corresponding adjustment, and add a stagnant ring judgement, make DC bus-bar voltage all the time higher than a certain minimum value of electrical network crest voltage, can reduce the voltage difference between DC bus and line voltage, improve the conversion efficiency of control system, prevent that forward and backward level MPPT controls switching repeatedly when critical conditions, cause system unstable operation.
Accompanying drawing explanation
Fig. 1 is theory diagram of the present utility model.
In accompanying drawing, 1 represents solar panel, and 2 represent Boost booster circuit, and 3 represent DC bus, 4 represent H bridge inverter circuit, 5 represent electrical network, and 6 represent the first electric current and voltage Acquisition Circuit, and 7 represent the second disturbance executive circuit, 8 represent tertiary voltage current collection circuit, 9 represent the first disturbance executive circuit, and 10 represent second voltage current collection circuit, and 11 represent MPPT controller.
Embodiment
Two-stage MPPT cooperative control system based on efficient self-adapted disturbance observation, comprise the H bridge inverter circuit 4 being connected with electrical network 5, the MPPT controller 11 being connected with electrical network 5 with solar panel 1, MPPT controller 11 is connected with H bridge inverter circuit 4 by the first disturbance executive circuit 9, key is: described control system also comprises the Boost booster circuit 2 being connected with H bridge inverter circuit 4 by DC bus 3, Boost booster circuit 2 is connected with solar panel 1, MPPT controller 11 is connected with Boost booster circuit 2 by the second disturbance executive circuit 7, MPPT controller 11 gathers solar panel 1, DC bus 3, the voltage and current signal of electrical network 5, after relatively processing, output signal to respectively the first disturbance executive circuit 9 and the second disturbance executive circuit 7.
Described MPPT controller 11 is connected with solar panel 1 by the first electric current and voltage Acquisition Circuit 6.
Described MPPT controller 11 is connected with electrical network 5 by second voltage current collection circuit 10.
Described MPPT controller 11 is connected with DC bus 3 by tertiary voltage current collection circuit 8.
The utility model is in the specific implementation:
When a, start, first control system parameters is carried out to initialization, detect the open-circuit voltage of solar panel 1, and judge whether open-circuit voltage meets the requirement of start minimum voltage, if open-circuit voltage is lower than minimum start voltage, control system is in waiting status, until open-circuit voltage is greater than minimum start voltage.
The output voltage V of b, 10 pairs of solar panels 1 of MPPT controller
pVwith electrical network 5 voltage V
aCmaxcompare, if V
pV> V
aCmax, system should convert inverter mode in single-stage, and MPPT controller 11 can output signal to the first disturbance executive circuit 9, is MPPT and controls, if V by H bridge inverter circuit 4
pV< V
aCmax, system should be in Two Stages inverter mode, and MPPT controller 11 can output signal to the second disturbance executive circuit 7, is MPPT controls by Boost booster circuit 2.Wherein, single-phase inversion system, V
aCmaxfor phase voltage peak value, three-phase inversion system, V
aCmaxfor line voltage peak.
C, if control system is in Two Stages inverter mode, it is to start from the open-circuit voltage of solar panel 1 that system starts working point, we utilize constant duty ratio D_ Δ method of perturbation to start, the output power of solar panel 1 is moved towards the direction increasing always, trace into rapidly near maximum power point, when the output voltage of solar panel 1 moves on near maximum power point, power deviation is relatively little, now adopt self-adaptation dutycycle direct perturbation to carry out MPPT control, by introducing step-length coefficient lambda 1=|P_ Δ |/| the automatic on-line adjustment of P_ Δ _ 1| solves traditional dutycycle method of perturbation step sizes and is difficult to the problem of selecting.For fear of power change direction error in judgement, added the symbol decision to double power deviation P_ Δ and P_ Δ _ 1, if P_ Δ and P_ Δ _ 1 are all less than zero, dutycycle perturbation direction is negate, otherwise constant.Tertiary voltage current collection circuit 8 can be in real time by the Voltage-output on DC bus 3 to MPPT controller 11, MPPT controller 11 is according to the voltage difference between DC bus 3 and electrical network 5 voltages, DC bus-bar voltage is implemented voltage floating control and added a stagnant ring judgement, the Control of Voltage of DC bus 3 is adjusted in real time according to MPPT, and DC bus-bar voltage is controlled at civil power peak value V
aCmax+30V(V
aCmax changes along with city's electro-mechanical wave).In this MPPT control procedure, H bridge inverter circuit 4 quits work, and the output voltage that Boost booster circuit 2 is responsible for control solar panel 1 is DC bus-bar voltage and inverter output current waveform.
If d system converts inverter mode in single-stage, it is to start from the open-circuit voltage of solar panel 1 that system starts working point, we utilize constant voltage step-length V_ Δ method of perturbation to start, the output power of solar panel 1 is moved towards the direction increasing always, trace near maximum power point rapidly.When the output voltage of solar panel 1 moves on near maximum power point, adopt adaptive voltage variable step method of perturbation to carry out MPPT control, by introducing step-length coefficient lambda 2=|P_ Δ |/| the automatic on-line adjustment of P_ Δ _ 1| guarantees good dynamic response and the steady-state behaviour of MPPT maximal power tracing.For fear of power change direction error in judgement, added the symbol decision to double power deviation P_ Δ and P_ Δ _ 1 simultaneously, if P_ Δ and P_ Δ _ 1 are all less than zero, voltage disturbance direction negate, otherwise constant.Tertiary voltage current collection circuit 8 can be in real time by the Voltage-output on DC bus 3 to MPPT controller 11, MPPT controller 11 is according to the voltage difference between DC bus 3 and electrical network 5 voltages, DC bus-bar voltage is implemented voltage floating control and added a stagnant ring judgement, the Control of Voltage of DC bus 3 is adjusted in real time according to MPPT, under be limited to civil power peak value V
aCmax+50V(V
aCmax changes along with city's electro-mechanical wave), be above limited to upper limit maximum protection value.In this MPPT control procedure, Boost booster circuit 2 quits work, and the output voltage that H bridge inverter circuit 4 is responsible for control solar panel 1 is DC bus-bar voltage and inverter output current waveform.
Claims (4)
1. the two-stage MPPT cooperative control system based on efficient self-adapted disturbance observation, comprise the H bridge inverter circuit (4) being connected with electrical network (5), the MPPT controller (11) being connected with electrical network (5) with solar panel (1), MPPT controller (11) is connected with H bridge inverter circuit (4) by the first disturbance executive circuit (9), it is characterized in that: described control system also comprises the Boost booster circuit (2) being connected with H bridge inverter circuit (4) by DC bus (3), Boost booster circuit (2) is connected with solar panel (1), MPPT controller (11) is connected with Boost booster circuit (2) by the second disturbance executive circuit (7), MPPT controller (11) gathers solar panel (1), DC bus (3), the voltage and current signal of electrical network (5), after relatively processing, output signal to respectively the first disturbance executive circuit (9) and the second disturbance executive circuit (7).
2. the two-stage MPPT cooperative control system based on efficient self-adapted disturbance observation according to claim 1, is characterized in that: described MPPT controller (11) is connected with solar panel (1) by the first electric current and voltage Acquisition Circuit (6).
3. the two-stage MPPT cooperative control system based on efficient self-adapted disturbance observation according to claim 1, is characterized in that: described MPPT controller (11) is connected with electrical network (5) by second voltage current collection circuit (10).
4. the two-stage MPPT cooperative control system based on efficient self-adapted disturbance observation according to claim 1, is characterized in that: described MPPT controller (11) is connected with DC bus (3) by tertiary voltage current collection circuit (8).
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2018166165A1 (en) * | 2017-03-13 | 2018-09-20 | 厦门科华恒盛股份有限公司 | Mppt disturbance method for photovoltaic power generation system |
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2013
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2018166165A1 (en) * | 2017-03-13 | 2018-09-20 | 厦门科华恒盛股份有限公司 | Mppt disturbance method for photovoltaic power generation system |
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Granted publication date: 20140409 |