CN203103982U - Maximum power tracking control system of two-stage grid-connected photovoltaic inverter - Google Patents
Maximum power tracking control system of two-stage grid-connected photovoltaic inverter Download PDFInfo
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- CN203103982U CN203103982U CN2012207309686U CN201220730968U CN203103982U CN 203103982 U CN203103982 U CN 203103982U CN 2012207309686 U CN2012207309686 U CN 2012207309686U CN 201220730968 U CN201220730968 U CN 201220730968U CN 203103982 U CN203103982 U CN 203103982U
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E10/00—Energy generation through renewable energy sources
- Y02E10/50—Photovoltaic [PV] energy
- Y02E10/56—Power conversion systems, e.g. maximum power point trackers
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Abstract
The utility model provides the maximum power tracking control system of a two-stage grid-connected photovoltaic inverter, which comprises a voltage detection circuit used for monitoring the open-circuit voltage of a photovoltaic array during the starting-up period, and a voltage loop control circuit used for enabling the output voltage of the photovoltaic array to move from the open-circuit voltage to a maximum power point through the control over the voltage loop, and carrying out the follow-up control over the maximum power point when the output voltage of the photovoltaic array reaches a command potential. The voltage detection circuit is connected with the voltage loop control circuit. The maximum power tracking control system of the two-stage grid-connected photovoltaic inverter has the advantages of simple structure and low cost.
Description
Technical field
The utility model relates to the control technology field of photovoltaic generating system, particularly relates to a kind of maximal power tracing control system of two-stage type photovoltaic combining inverter.
Background technology
Exhausted day by day along with the energy, solar energy becomes people with its special advantages and closes the focus of watching attentively, and photovoltaic generation has obtained fast development at the international level in recent years.The photoelectric conversion efficiency of photovoltaic cell is low to be one of subject matter of photovoltaic generation, realizes that by power electronic technology and control technology the maximal power tracing of photovoltaic generation is the effective measures that address this problem in the prior art.
The two-stage type topological structures that adopt belt switch DC voltage booster circuit (BOOST circuit) to boost in small-sized independent photovoltaic system, it is extremely important therefore to study two-stage type photovoltaic DC-to-AC converter maximal power tracing control system more.MPPT(MPPT maximum power point tracking, Maximum Power Point Tracking) controller is the upgraded product of traditional solar charging/discharging controller.The MPPT controller can the detecting real-time solar panels generating voltage, and follow the trail of ceiling voltage current value (VI) make system with the highest efficient to charge in batteries.
The MPPT controller is applied in the solar energy photovoltaic system, coordinates the work of solar panel, storage battery, load, is very important assembly in the photovoltaic system.
The operation principle of MPPT controller commonly used comprises constant voltage tracing (CVT), disturbance observation, conductance increment method, optimum gradient method etc. at present.Existing constant voltage tracing controller has good stable when starting, but to the bad adaptability of environment.And the control adaptability of other several methods is strong, but the problem that when starting, all exists the sampling error influence to start.
By the output characteristic curve of photovoltaic (PV) array as can be known, near the little deviation of the voltage sample open circuit voltage promptly can cause current value than large deviation, and the startup working point of system is to begin from open circuit voltage, thereby when using current value to control to judge, just may cause the control misjudgment of system, influence the stability of the MPPT of system startup.The two-stage type photovoltaic combining inverter is when carrying out maximal power tracing, and it is bigger to occur the DC bus-bar voltage fluctuation easily, the problem of system's fluctuation of service, and the appearance of this problem is because the energy imbalance of DC side energy and AC side feed-in electrical network causes.If DC side enters the energy of the energy of bus capacitor greater than AC side feed-in electrical network, then the voltage on the bus capacitor will raise.Opposite extreme situations is, a back level inverter is not worked, if the protection that the front maximal power tracing there is no need, busbar voltage can constantly raise; Opposite situation is, if the power of AC side feed-in electrical network greater than the power of DC side, busbar voltage will reduce.
The utility model content
The technical problems to be solved in the utility model provides a kind of maximal power tracing control system of two-stage type photovoltaic combining inverter of the generating efficiency that can improve photovoltaic generating system.
For solving the problems of the technologies described above, embodiment of the present utility model provides a kind of maximal power tracing control system of two-stage type photovoltaic combining inverter, comprise: be used for the voltage detecting circuit of the open circuit voltage of monitoring photovoltaic array when start, be used for the Voltage loop control circuit that makes the output voltage of photovoltaic array move and after the output voltage of photovoltaic array reaches command voltage, carry out MPPT maximum power point tracking control to maximum power point from open circuit voltage by Voltage loop control; Wherein said voltage detecting circuit connects described Voltage loop control circuit.
Preferred as technique scheme, the Voltage loop control circuit comprises the DC-DC control section that is used to finish MPPT maximum power point tracking, and is used for stablize busbar voltage and control output and the DC-AC control section of line voltage with the grid-connected current of frequency homophase.
Preferred as technique scheme, wherein the DC-DC control section comprises:
Acquiring unit connects output voltage and the output current of photovoltaic battery panel to obtain photovoltaic battery panel;
The regulation and control unit is used for detected output voltage and reference voltage are compared, and error is regulated back production burst modulation signal through proportional controller; Described regulon connects booster circuit so that described booster circuit is regulated duty ratio according to this pulse-modulated signal.
Preferred as technique scheme, described Voltage loop control circuit also comprises pressure limiting circuit.
The beneficial effect of technique scheme of the present utility model is as follows:
The maximal power tracing control system of two-stage type photovoltaic combining inverter of the present utility model is simple in structure, with low cost.
Description of drawings
Fig. 1 is the structural representation of the utility model embodiment;
Fig. 2 is the principle schematic of self adaptation duty ratio disturbance circuit;
Fig. 3 is the principle schematic of the DC-DC control section of Voltage loop control circuit.
Embodiment
For making the technical problems to be solved in the utility model, technical scheme and advantage clearer, be described in detail below in conjunction with the accompanying drawings and the specific embodiments.
Embodiment of the present utility model provides a kind of maximal power tracing control system of the photovoltaic combining inverter of two-stage type as shown in Figure 1, comprise: be used for the voltage detecting circuit 1 of the open circuit voltage of monitoring photovoltaic array when start, be used for the Voltage loop control circuit 2 that makes the output voltage of photovoltaic array move and after the output voltage of photovoltaic array reaches command voltage, carry out MPPT maximum power point tracking control to maximum power point from open circuit voltage by Voltage loop control; Wherein said voltage detecting circuit 1 connects described Voltage loop control circuit 2.Wherein, voltage detecting circuit 1 detects the open circuit voltage of photovoltaic array in when start, and with open circuit voltage multiply by 0.75 as constant voltage the command voltage when control starts.Voltage loop control circuit 2 makes the output voltage of photovoltaic array begin to move toward the maximum power point direction from open circuit voltage by Voltage loop control, and adopts self adaptation duty ratio disturbance circuit to carry out MPPT control after the output voltage when photovoltaic array reaches command voltage.
Self adaptation duty ratio disturbance circuit is that the automatic on-line adjuster by step-length λ solves the problem that traditional duty ratio method of perturbation step sizes is difficult to select.The operation principle of voltage detecting circuit 1 as shown in Figure 2.This is a prior art, does not repeat them here.
Wherein, Voltage loop control circuit 2 is used to finish MPPT maximum power point tracking.Voltage loop control circuit 2 comprises the DC-DC control section that is used to finish MPPT maximum power point tracking, and is used for stablizing busbar voltage and control output and the DC-AC control section of line voltage with the grid-connected current of frequency homophase.
DC-DC control section comprising as shown in Figure 3 wherein:
Acquiring unit connects output voltage and the output current of photovoltaic battery panel to obtain photovoltaic battery panel;
The regulation and control unit is used for detected output voltage and reference voltage are compared, and error is regulated back production burst modulation signal through proportional controller;
Described regulon connects booster circuit so that described booster circuit is regulated duty ratio according to this pulse-modulated signal.
Concrete, this reference voltage can obtain by the MPPT algorithm, and this is a prior art.Comparing reference voltage in the regulation and control unit with the virtual voltage of detected PV array output, is used for production burst modulation (PWM) signal after its error is regulated through PI.Utilize the duty ratio of this letter PWM control connection, to regulate the DC output of this Boost circuit at the Boost circuit of the DC/DC of PV array output end circuit.Wherein, the initial value that PI regulates parameter utilizes the sisotool instrument among the state space method of average and the MATLAB to obtain, and this is a prior art.
Concrete realization circuit can and structure as shown in Figure 3, this acquiring unit comprises that PV detects voltage and PV detects electric current, connects the PV cell panel respectively and connects output voltage and the output current of photovoltaic battery panel to obtain photovoltaic battery panel to obtain;
Regulate and control the unit and comprise that PI, PWM generate, drive circuit, be used for the reference voltage of detected output voltage of acquiring unit and MPPT is compared, and error is generated pulse-modulated signal through PI adjusting back by the PWM generation.Regulate the DC/DC of this PV cell panel then by drive circuit, to adjust DC output.
Wherein, this Voltage loop control circuit 2 also comprises pressure limiting circuit, to damage the main circuit device for the overtension that prevents DC output.Pressure limiting circuit is used for that Voltage loop control circuit 2 participates in the middle of the control of DC bus-bar voltage when detecting direct voltage and be higher than higher limit, makes DC bus-bar voltage can be stabilized in set point fast.
Wherein, this Voltage loop control circuit 2 comprises that also being used for stablizing busbar voltage exports and the DC-AC control section of line voltage with the grid-connected current of frequency homophase with control.The energy control strategy of DC-AC part is a reference voltage of setting dc bus, when virtual voltage is higher than expectation voltage, increases the reference peak value of grid-connected current; Otherwise, then reduce the reference peak value of grid-connected current.When carrying out DC-AC control, at first the set point of direct voltage and the deviation of actual feedback are carried out the computing of Voltage loop control, and this operation result is set at the reference peak value of grid-connected current; Secondly, the sine value that reference peak value and the digital phase-locked computing of grid-connected current obtained carries out multiplying, obtain and line voltage with the grid-connected current reference value of frequency homophase; At last, introduce the grid-connected current feedback,, make its follow current reference value, reach the purpose of balance DC side and AC side feed-in electrical network energy by direct control to grid-connected current.When carrying out grid-connected current control,, avoid DC side too high voltage to occur, improve the stability and the stable state accuracy of system, add a voltage feed-forward control control in order to suppress the disturbing influence of line voltage to system.
The above is a preferred implementation of the present utility model; should be understood that; for those skilled in the art; under the prerequisite that does not break away from principle described in the utility model; can also make some improvements and modifications, these improvements and modifications also should be considered as protection range of the present utility model.
Claims (4)
1. the maximal power tracing control system of a two-stage type photovoltaic combining inverter, it is characterized in that, comprise: be used for the voltage detecting circuit of the open circuit voltage of monitoring photovoltaic array when start, be used for the Voltage loop control circuit that makes the output voltage of photovoltaic array move and after the output voltage of photovoltaic array reaches command voltage, carry out MPPT maximum power point tracking control to maximum power point from open circuit voltage by Voltage loop control; Wherein said voltage detecting circuit connects described Voltage loop control circuit.
2. the maximal power tracing control system of two-stage type photovoltaic combining inverter according to claim 1, it is characterized in that, the Voltage loop control circuit comprises the DC-DC control section that is used to finish MPPT maximum power point tracking, and is used for stablizing busbar voltage and control output and the DC-AC control section of line voltage with the grid-connected current of frequency homophase.
3. the maximal power tracing control system of two-stage type photovoltaic combining inverter according to claim 2, wherein the DC-DC control section comprises:
Acquiring unit connects output voltage and the output current of photovoltaic battery panel to obtain photovoltaic battery panel;
The regulation and control unit is used for detected output voltage and reference voltage are compared, and error is regulated back production burst modulation signal through proportional controller; Described regulon connects booster circuit so that described booster circuit is regulated duty ratio according to this pulse-modulated signal.
4. the maximal power tracing control system of two-stage type photovoltaic combining inverter according to claim 3 is characterized in that, described Voltage loop control circuit also comprises pressure limiting circuit.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2012207309686U CN203103982U (en) | 2012-12-26 | 2012-12-26 | Maximum power tracking control system of two-stage grid-connected photovoltaic inverter |
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| Application Number | Priority Date | Filing Date | Title |
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| CN2012207309686U CN203103982U (en) | 2012-12-26 | 2012-12-26 | Maximum power tracking control system of two-stage grid-connected photovoltaic inverter |
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| CN203103982U true CN203103982U (en) | 2013-07-31 |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107342678A (en) * | 2017-08-29 | 2017-11-10 | 成都雷电微力科技有限公司 | A kind of Switching Power Supply output overshoot suppression circuit and Switching Power Supply |
| CN112865065A (en) * | 2021-03-05 | 2021-05-28 | 国网江苏省电力有限公司镇江供电分公司 | Power distribution network coordination control method and system containing high-permeability light storage |
-
2012
- 2012-12-26 CN CN2012207309686U patent/CN203103982U/en not_active Expired - Lifetime
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107342678A (en) * | 2017-08-29 | 2017-11-10 | 成都雷电微力科技有限公司 | A kind of Switching Power Supply output overshoot suppression circuit and Switching Power Supply |
| CN112865065A (en) * | 2021-03-05 | 2021-05-28 | 国网江苏省电力有限公司镇江供电分公司 | Power distribution network coordination control method and system containing high-permeability light storage |
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Granted publication date: 20130731 |