CN116404975B - Photovoltaic controller cooperative control method applied to staggered BUCK topology - Google Patents

Photovoltaic controller cooperative control method applied to staggered BUCK topology Download PDF

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CN116404975B
CN116404975B CN202310276342.5A CN202310276342A CN116404975B CN 116404975 B CN116404975 B CN 116404975B CN 202310276342 A CN202310276342 A CN 202310276342A CN 116404975 B CN116404975 B CN 116404975B
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limit
max
maximum power
duty
algorithm
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CN116404975A (en
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王锴逸
杨志祥
冯喜军
孙勇卫
何志峰
肖恩辉
肖泽龙
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Weisheng Energy Technology Co ltd
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    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02S—GENERATION OF ELECTRIC POWER BY CONVERSION OF INFRARED RADIATION, VISIBLE LIGHT OR ULTRAVIOLET LIGHT, e.g. USING PHOTOVOLTAIC [PV] MODULES
    • H02S40/00—Components or accessories in combination with PV modules, not provided for in groups H02S10/00 - H02S30/00
    • H02S40/30—Electrical components
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J7/00—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
    • H02J7/007—Regulation of charging or discharging current or voltage
    • H02J7/00712—Regulation of charging or discharging current or voltage the cycle being controlled or terminated in response to electric parameters
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J7/00—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
    • H02J7/007—Regulation of charging or discharging current or voltage
    • H02J7/00712—Regulation of charging or discharging current or voltage the cycle being controlled or terminated in response to electric parameters
    • H02J7/00714—Regulation of charging or discharging current or voltage the cycle being controlled or terminated in response to electric parameters in response to battery charging or discharging current
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J7/00—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
    • H02J7/007—Regulation of charging or discharging current or voltage
    • H02J7/00712—Regulation of charging or discharging current or voltage the cycle being controlled or terminated in response to electric parameters
    • H02J7/00714—Regulation of charging or discharging current or voltage the cycle being controlled or terminated in response to electric parameters in response to battery charging or discharging current
    • H02J7/00716—Regulation of charging or discharging current or voltage the cycle being controlled or terminated in response to electric parameters in response to battery charging or discharging current in response to integrated charge or discharge current
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J7/00—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
    • H02J7/34—Parallel operation in networks using both storage and other dc sources, e.g. providing buffering
    • H02J7/35—Parallel operation in networks using both storage and other dc sources, e.g. providing buffering with light sensitive cells
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
    • H02M3/00—Conversion of dc power input into dc power output
    • H02M3/02—Conversion of dc power input into dc power output without intermediate conversion into ac
    • H02M3/04—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters
    • H02M3/10—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode
    • H02M3/145—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal
    • H02M3/155—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only
    • H02M3/156—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only with automatic control of output voltage or current, e.g. switching regulators
    • H02M3/158—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only with automatic control of output voltage or current, e.g. switching regulators including plural semiconductor devices as final control devices for a single load
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
    • H02M3/00—Conversion of dc power input into dc power output
    • H02M3/02—Conversion of dc power input into dc power output without intermediate conversion into ac
    • H02M3/04—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters
    • H02M3/10—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode
    • H02M3/145—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal
    • H02M3/155—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only
    • H02M3/156—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only with automatic control of output voltage or current, e.g. switching regulators
    • H02M3/158—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only with automatic control of output voltage or current, e.g. switching regulators including plural semiconductor devices as final control devices for a single load
    • H02M3/1584—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only with automatic control of output voltage or current, e.g. switching regulators including plural semiconductor devices as final control devices for a single load with a plurality of power processing stages connected in parallel
    • H02M3/1586—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only with automatic control of output voltage or current, e.g. switching regulators including plural semiconductor devices as final control devices for a single load with a plurality of power processing stages connected in parallel switched with a phase shift, i.e. interleaved
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J2300/00—Systems for supplying or distributing electric power characterised by decentralized, dispersed, or local generation
    • H02J2300/20—The dispersed energy generation being of renewable origin
    • H02J2300/22—The renewable source being solar energy
    • H02J2300/24—The renewable source being solar energy of photovoltaic origin
    • H02J2300/26—The renewable source being solar energy of photovoltaic origin involving maximum power point tracking control for photovoltaic sources
    • 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

Abstract

The invention discloses a photovoltaic controller cooperative control method applied to BUCK type topology. The control method is used for carrying out cooperative control on constant current and maximum power tracking by sampling to obtain high-voltage side voltage and low-voltage side voltage and current. Because the charging current of the battery is influenced by the process and the specification, the limitation of the maximum charging current of the battery is considered, and the control method divides the maximum charging current into four cases for processing according to the change of the limitation of the maximum charging current, so that constant current or maximum power tracking control can be selected in a self-adaptive mode. The photovoltaic controller control strategy adopted by the invention is simple to realize, stable in control and capable of being matched with the subsequent operation well.

Description

Photovoltaic controller cooperative control method applied to staggered BUCK topology
Technical Field
The invention relates to the technical field of power electronic converters, in particular to a photovoltaic controller cooperative control method applied to staggered BUCK topology.
Background
Today, conventional energy represented by coal, natural gas, etc. is increasingly exhausted, and the energy demand is expanding due to economic development and social progress. To solve this contradiction, the development of new energy is becoming a primary alternative. How to reasonably develop and utilize new energy is becoming a popular research direction.
The solar energy is inexhaustible, has wide distribution range and convenient utilization, and is particularly popular in places with wide land and thin people due to the characteristics, so that the solar energy becomes the preferred scheme for generating new energy. However, there are some drawbacks to using solar energy, firstly, the current material technology limits the conversion efficiency of the photovoltaic panel; secondly, the output power of the photovoltaic cell panel is affected by various aspects such as illumination intensity, ambient temperature and the like, and the output voltage and the output power show nonlinear characteristics on the photovoltaic panel. The solar energy is combined with the characteristic of strong randomness, and the stable use and the power generation efficiency of the photovoltaic controller are challenged.
Therefore, in order to utilize solar energy to generate electricity with maximum efficiency, an important approach is to adjust the working point of the photovoltaic cell in real time by using the photovoltaic controller so that the photovoltaic cell always works near the maximum power point, and this process is called maximum power point tracking. However, since the operation of the photovoltaic controller is often required to be matched with the use of a back end such as an inverter and a battery, the output current of the photovoltaic controller is artificially limited, so that the operation of the photovoltaic controller needs to be comprehensively considered to be the operation in a maximum power point tracking mode and the operation in a constant current mode. The two modes are not separated from the mutual switching process, if the switching process is unreasonable, the current and voltage stress of the power electronic device is overlarge, and the device is burnt out seriously. Thus, the photovoltaic controller also needs to have the ability to reasonably switch between the two modes.
Disclosure of Invention
Aiming at the problems and the defects existing in the prior art, the invention improves the running stability of the system while protecting the power generation efficiency of the photovoltaic controller, and provides a photovoltaic controller cooperative control method applied to staggered BUCK type topology.
In order to achieve the purpose of the invention, the technical scheme adopted by the invention is as follows:
a photovoltaic controller cooperative control method applied to staggered BUCK topology comprises the following steps:
step 1, collecting a low-voltage side voltage U bat, a low-voltage side current I bat and a high-voltage side voltage U pv through a sampling circuit collecting and sampling circuit;
Step 2, filtering the acquired data to obtain a filtered low-voltage side voltage U bat1, a filtered low-voltage side current I bat1 and a filtered high-voltage side voltage Upv1, calculating to obtain the output power P T at the current moment, and recording;
Step 3, judging whether the obtained filtered low-voltage side voltage U bat1, the filtered low-voltage side current Ibat1 and the filtered high-voltage side voltage U pv1 exceed a threshold value, and detecting whether the temperature exceeds the threshold value: if one of the values exceeds the threshold value, the system is shut down; if all the values are within the threshold range, the method moves to step 4;
Step 4, running a maximum power tracking algorithm or a constant current control algorithm, and after changing the duty ratio once, running step 5, and running the maximum power tracking algorithm when running for the first time;
Step 5, firstly judging that the maximum power tracking algorithm or the constant current control algorithm is operated, and then detecting whether the maximum current limit flag bit I max_limit is modified: if not, not processing and returning to the step 1, and then re-operating according to the round-robin algorithm; if so, further judging whether the next round of circulation needs to switch the current algorithm, wherein the judgment logic is as follows:
if it is operated by the maximum power tracking algorithm, then
When I max_limit is smaller and I bat>Imax_limit is met, returning to the step 1, running the constant current control algorithm after entering the next cycle, and if I bat＜Imax_limit, continuing to run the maximum power tracking algorithm;
when I max_limit becomes large, returning to the step 1, and continuing to run the maximum power tracking algorithm after entering the next cycle;
if the constant current control algorithm is operated, then
When I max_limit becomes smaller, returning to the step 1, and continuing to operate the constant current control algorithm after entering the next cycle;
When I max_limit becomes large, the duty ratio of the switching tube is continuously increased, the output power corresponding to the last cycle is set to be P T+1, and when P T>PT+1 and I bat>Imax_limit are carried out, the step 1 is returned to enter the next cycle, and then the constant current control algorithm is continuously operated; when P T＜PT+1 appears, the current system can operate at the maximum power point, i.e. I bat＜Imax_limit is always satisfied, and the maximum power tracking algorithm is operated after the next cycle is entered after returning to the step 1.
Further, the filtering function adopted in the step 2 is as follows:
Where F (x is a filter function, freq Crtl is a control frequency of the inverter, freq out is an output frequency of the inverter, Z is an integer part of , F is a fractional part/> , and Tol i is data acquired for the ith time.
Furthermore, the maximum power tracking algorithm in the step 4 is to first use a larger duty ratio to perform large step adjustment, and when the maximum power point is detected, use a smaller duty ratio to perform small step adjustment.
Further, the value of the smaller duty ratio variation follows the following formula:
duty＝duty_pre±(delta_duty*mode)，mode<＝4
Where duty is the current time duty cycle, duty_pre is the last time duty cycle, delta_duty is the duty cycle interval, and mode is the mode counter.
Further, in the step 4, when the constant current control algorithm is in the condition that the I max_limit is just the current corresponding to the maximum power point, the PI control is disabled due to the sampling error, so that the duty ratio reaches the upper limit 1, and the solution is as follows:
A 3 second delay is performed, if the duty cycle still reaches the upper limit of 1 after 3 seconds, I max_limit is subtracted by 2, PI control is performed again, if this situation is encountered next time, I max_limit is restored, meanwhile, the moment of subtracting 2 from I max_limit is recorded, and if this situation is not encountered again within 30 minutes, I max_limit is restored.
Further, the modification of the maximum current limit flag bit I max_limit in the step 5 is based on the limit of charging the energy storage battery.
Compared with the prior art, the invention has the advantages that:
1. The cooperative control method can adaptively select constant current control or maximum power point tracking control, and can furthest utilize the photovoltaic panel to generate electric energy on the premise of protecting the battery.
2. The filtering method can effectively filter secondary ripple waves generated by the direct current bus and improve the efficiency of tracking control of the maximum power point.
3. Aiming at the condition that the maximum charging current limit is just the current corresponding to the maximum power point, the failure of constant current control can be effectively avoided.
Drawings
FIG. 1 is a schematic diagram of a photovoltaic controller control architecture;
FIG. 2 is a circuit topology diagram of an interleaved BUCK type;
FIG. 3 is a graph of photovoltaic panel voltage versus power characteristics at different temperatures;
FIG. 4 is a graph of photovoltaic panel voltage versus power characteristics for different illumination intensities;
FIG. 5 is a flow chart of a control method of the photovoltaic controller of the present invention;
FIG. 6 is a schematic diagram of four modes of maximum power point tracking;
FIG. 7 is a schematic diagram of switching by constant current control;
fig. 8 is a schematic diagram of switching by maximum power point tracking control.
Detailed Description
In order to further describe the technical means and effects adopted by the present invention to achieve the preset purpose, the following is a detailed description of a photovoltaic controller cooperative control method applied to an interleaved BUCK topology according to the present invention, which is provided by referring to the accompanying drawings and preferred examples:
The invention will be further described with reference to the drawings and the specific examples.
As shown in fig. 1 and 2, the photovoltaic controller first collects the high-side voltage Upv, the low-side voltage Ubat and the low-side current Ibat in the staggered BUCK circuit through the sampling circuit. And then, filtering the sampled data, adjusting the duty ratio of the switching tube through a cooperative control algorithm, and controlling the switching tube Q1 through a driving circuit. In connection with fig. 5, the specific steps of the first cycle are as follows:
step 1: the sampling circuit collects a low-voltage side voltage Ubat, a low-voltage side current Ibat and a high-voltage side voltage Upv.
Step 2: taking the load of the inverter with the frequency of 60Hz as an example, the data collected by the sampling circuit comprises 120Hz ripple, and the control frequency is 10kHz, so that Z is 83 according to calculation, 4 bits are 0.3333 after taking decimal point, and F is not 0, and the data are obtained by a filtering function
Recording the voltage and the current corresponding to the filtered voltage and the filtered current as U bat1、Ibat1、Upv1, calculating the output power P T of the staggered BUCK type circuit according to a formula P T＝Ubat1×Ibat1, and then jumping to the step 2;
Step 3: judging whether the current value I bat1 and the voltage value U bat1、Upv1 exceed a threshold value or not, detecting whether the temperature exceeds an upper limit or not at the same time, if so, closing the system operation, if not, operating to the step 3 or the step 4, and if so, jumping to the step 3.
Step 4: and (3) running a maximum power tracking algorithm, initially running MPPT, performing large step adjustment, and setting the change amount of the adjusted duty ratio to be 0.05. The output power corresponding to the last cycle is set to be P T+1, P T+1 must have a non-zero value when the system runs for the first time, because the set value of I max_limit is 10A at least in consideration of the problems of current sampling precision and the like, the system has cycled at least more than 2 times of maximum power tracking algorithm before the system runs for the first time, and P T+1 and P T must have non-zero values. When P T<PT+1 is satisfied, namely the maximum power point is detected, the switching is performed to a small step, and the initial value of the duty ratio variation is set to be 0.005. Considering that the duty cycle changes are small during the small step adjustment, the sampling error may cause the adjustment to fail, in order to solve the above problem, in combination with fig. 6, the change of the duty cycle of the switch during the small step adjustment follows the following formula:
duty＝duty_pre±(delta_duty*mode)，mode<＝4
as can be seen from fig. 6, the maximum power tracking can be divided into 4 modes, mode is a mode counter, clear 0 when different modes are run, and add 1 when the same mode is run. After the maximum power tracking algorithm changes the duty cycle once, it jumps to step 5.
Step 5: it is detected whether the flag bit I max_limit of the maximum current limit is modified. If the algorithm is modified, further judging whether the next round of circulation needs to switch the current algorithm, and judging by the following steps:
if the current system is operating at maximum power point tracking control, it can be appreciated that the output current in this state satisfies I bat<＝Imax_limit. If Imax_limit becomes large, as shown in fig. 8, the power limit can refer to the power limit line 1, which is larger than the maximum power point, without affecting the current state, so the system will continue to run the maximum power tracking control.
If I max_limit becomes smaller and I bat>Imax_limit is satisfied, the power limitation may refer to the power limitation line 2, the operating point of the photovoltaic panel will decrease the power along the arrow to be equal to the solid point at the power limitation line 2, the system will switch to constant current control, if I bat＜Imax_limit, the power limitation line 2 and the photovoltaic curve have no intersection point, and the system will continue to operate the maximum power tracking control.
If not, the current logic is maintained.
After the related steps are completed, returning to the step 1, and performing the next round of circulation.
The steps of the subsequent cycle are as follows:
Steps 1-3 are as above.
Step 4: and 5, selecting to adopt a maximum power tracking control algorithm or a constant current control algorithm according to the step5 of the previous round, and jumping to the step5 after changing the duty ratio once.
Step 5: firstly, judging whether the maximum power tracking control algorithm or the constant current control algorithm is adopted by the step 4, and then detecting whether the flag bit I max_limit of the maximum current limit is modified or not. If the algorithm is modified, further judging whether the next round of circulation needs to switch the current algorithm, and judging by the following steps:
If the current system operates at the maximum power point tracking control, judging the method as above;
If the current system is operated in constant current control, as shown in fig. 7, it is assumed that the solid point S1 is the current operation point, and the hollow point S2 is the operation point corresponding to the previous cycle. If the power limit is now changed to power limit line 2, the microcontroller will increase the duty cycle by 0.02 each time, then point S1 and point S2 will move in the direction indicated by the arrow on the solid line. In the process, the output power of the photovoltaic cell corresponding to the point S1 is P S1, the output power of the photovoltaic cell corresponding to the point S2 is P S2, and the process always meets P S1>PS2, but a trigger condition I bat>Imax_limit is generated, and the system continues to operate constant current control. If the power limit is changed to the power limit line 1, the corresponding situation will be changed to be in the period of P S1>PS2, the condition I bat>Imax_limit will not be triggered until the condition P S1<＝PS2 is triggered, and the system will be switched from the constant current control to the maximum power point control. If the power limit is reduced to the power limit line 3 at this time, the system maintains the constant current control mode.
After the above-mentioned related steps are completed, the procedure returns to step 1.
It should be explained that the user determines whether to manually modify the maximum current limit flag I max_limi according to the limit of the charging of the energy storage battery, and the modification may be performed at any time, but only in step 5. The above steps 1 to 5 are the operation logic of the whole cooperative control, and it is worth mentioning that, in the cycle process of the steps, the change of the battery voltage can be ignored and the influence caused by the change of the temperature and the illumination intensity reflected in fig. 3 and 4 can be ignored in a very small time range.
It will be understood that parts of the present specification, not specifically set forth, are of the prior art, and that although specific embodiments of the present invention have been described above with reference to the accompanying drawings, these are by way of example only, and that various changes or modifications may be made to these embodiments without departing from the principles and spirit of the invention. The scope of the invention is limited only by the appended claims.

Claims (6)

1. A photovoltaic controller cooperative control method applied to staggered BUCK topology is characterized in that: the control method comprises the following steps:
Step 1, collecting a low-voltage side voltage U bat, a low-voltage side current I bat and a high-voltage side voltage U pv through a sampling circuit;
Step 2, filtering the acquired data to obtain a filtered low-voltage side voltage U bat1, a filtered low-voltage side current I bat1 and a filtered high-voltage side voltage U pv1, calculating to obtain output power P T at the current moment, and recording;
Step 3, judging whether the obtained filtered low-voltage side voltage U bat1, the filtered low-voltage side current I bat1 and the filtered high-voltage side voltage U pv1 exceed a threshold value, and detecting whether the temperature exceeds the threshold value: if one of the values exceeds the threshold value, the system is shut down; if all the values are within the threshold range, the method moves to step 4;
Step 4, running a maximum power tracking algorithm or a constant current control algorithm, and after changing the duty ratio once, running step 5, and running the maximum power tracking algorithm when running for the first time;
Step 5, firstly judging that the maximum power tracking algorithm or the constant current control algorithm is operated, and then detecting whether the maximum current limit flag bit I max_limit is modified: if not, not processing and returning to the step 1, and then re-operating according to the round-robin algorithm; if so, further judging whether the next round of circulation needs to switch the current algorithm, wherein the judgment logic is as follows: if it is operated by the maximum power tracking algorithm, then
When I max_limit is smaller and I bat>Imax_limit is met, returning to the step 1, running the constant current control algorithm after entering the next cycle, and if I bat＜Imax_limit, continuing to run the maximum power tracking algorithm;
when I max_limit becomes large, returning to the step 1, and continuing to run the maximum power tracking algorithm after entering the next cycle;
if the constant current control algorithm is operated, then
When I max_limit becomes smaller, returning to the step 1, and continuing to operate the constant current control algorithm after entering the next cycle;
When I max_limit becomes large, the duty ratio of the switching tube is continuously increased, the output power corresponding to the last cycle is set to be P T+1, and when P T>PT+1 and I bat>Imax_limit are carried out, the step 1 is returned to enter the next cycle, and then the constant current control algorithm is continuously operated; when P T＜PT+1 appears, the current system can operate at the maximum power point, i.e. I bat＜Imax_limit is always satisfied, and the maximum power tracking algorithm is operated after the next cycle is entered after returning to the step 1.
2. The method for cooperatively controlling a photovoltaic controller applied to an interleaved BUCK topology according to claim 1, wherein the method comprises the steps of: the filtering function adopted in the step 2 is as follows:
Where F (x) is a filter function, freq Crtl is a control frequency of the inverter, freq out is an output frequency of the inverter, Z is an integer part of , F is a fractional part/> , and Tol i is data acquired the i-th time.
3. The method for cooperatively controlling a photovoltaic controller applied to an interleaved BUCK topology according to claim 1, wherein the method comprises the steps of: the maximum power tracking algorithm in the step 4 is to firstly adopt larger duty ratio variation to carry out large step adjustment, and when the maximum power point is detected, smaller duty ratio variation is adopted to carry out small step adjustment.
4. A method for cooperative control of a photovoltaic controller applied to an interleaved BUCK-type topology according to claim 3, wherein: the value of the smaller duty cycle variation follows the following formula:
duty＝duty_pre±(delta_duty*mode)，mode<＝4
Where duty is the current time duty cycle, duty_pre is the last time duty cycle, delta_duty is the duty cycle interval, and mode is the mode counter.
5. The method for cooperatively controlling a photovoltaic controller applied to an interleaved BUCK topology according to claim 1, wherein the method comprises the steps of: in the step 4, when the constant current control algorithm is in the condition that the I max_limit is just the current corresponding to the maximum power point, the PI control is invalid due to the sampling error, so that the duty ratio reaches the upper limit 1, and the solution is as follows:
After 3 seconds, if the duty ratio still reaches the upper limit of 1, I max_limit is subtracted by 2, PI control is performed again, I max_limit is restored if this situation is encountered next time, at the same time, I max_limit minus 2 is recorded, and if this situation is not encountered again within 30 minutes, I max_limit is restored.
6. The method for cooperatively controlling a photovoltaic controller applied to an interleaved BUCK topology according to claim 1, wherein the method comprises the steps of: the modification of the maximum current limit flag bit I max_limit in step 5 is based on the limit of charging the energy storage battery.
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CN102843035A (en) * 2012-09-19 2012-12-26 南京国臣信息自动化技术有限公司 Transformer control method with precise voltage and current limitation and maximum power point tracking functions
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