CN112416049A - Power tracking method and system of MPPT controller based on PID - Google Patents
Power tracking method and system of MPPT controller based on PID Download PDFInfo
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- G05—CONTROLLING; REGULATING
- G05F—SYSTEMS FOR REGULATING ELECTRIC OR MAGNETIC VARIABLES
- G05F1/00—Automatic systems in which deviations of an electric quantity from one or more predetermined values are detected at the output of the system and fed back to a device within the system to restore the detected quantity to its predetermined value or values, i.e. retroactive systems
- G05F1/66—Regulating electric power
- G05F1/67—Regulating electric power to the maximum power available from a generator, e.g. from solar cell
Abstract
The utility model provides a MPPT controller's power tracking method based on PID, carry out conductance method with input power and handle the back output and give the power loop, all increase feedback signal in every loop simultaneously, and be the feedback signal of MPPT controller output, make power loop, voltage loop and current loop all can obtain feedback signal, and then carry out PID control processing, and then make the signal of each output of power loop, voltage loop and current loop can obtain furthest's correction, can need not to measure the target voltage point of MPPT controller's maximum output in advance under this kind of condition, direct quick stable maximum output who tracks the MPPT controller. In addition, a power tracking system of the MPPT controller based on PID is also provided.
Description
Technical Field
The application belongs to the technical field of MPPT controller power tracking, and particularly relates to a PID-based MPPT controller power tracking method and system which can track maximum output power quickly and stably without measuring voltage points.
Background
At present, when solar energy is adopted for charging outdoors, the energy storage equipment needs to be charged quickly, and therefore solar energy needs to be converted into electric energy to the maximum extent and output to the energy storage equipment. This involves the optimization of the MPPT algorithm, which uses a constant voltage in the conventional optimization method, but this method requires the prior measurement of the maximum output power of the solar panel and the specific solar panel and the corresponding system to maintain the maximum output power. There are also methods using perturbed observations, but the tracking speed of this method is very slow and is easily disturbed by the outside world. There are also methods that use conductance increments, but such methods are susceptible to external disturbances and there are situations where the maximum output power cannot be tracked.
Disclosure of Invention
The application aims to provide a power tracking method and a power tracking system of a PID-based MPPT controller, which can quickly and stably track the maximum output power without measuring a voltage point.
A first aspect of an embodiment of the present application provides a power tracking method for a MPPT controller based on a PID, including the following steps:
setting a power loop, a voltage loop and a current loop of MPPT control, and connecting the power loop, the voltage loop, the current loop and the MPPT controller in sequence;
processing the input power by adopting a conductance method instruction, and outputting the processed input power to the power loop;
inputting a power feedback signal output by an output end of the MPPT controller to the power loop;
inputting a voltage feedback signal output by an output end of the MPPT controller to the voltage loop;
inputting a current feedback signal output by an output end of the MPPT controller to the current loop;
after the processing is carried out by adopting the method, the maximum output power of the MPPT controller is obtained.
In one embodiment, after the step of processing the input power by using the conductance method instruction and outputting the processed input power to the power loop, the method further comprises the following steps:
and after the power loop carries out PID control processing on the input power, outputting a voltage signal to the voltage loop so as to obtain a target voltage point of the maximum output power of the MPPT controller.
In one embodiment, after the step of inputting the power feedback signal output by the output terminal of the MPPT controller to the power loop, the method further includes:
and performing PID control processing on the power processed by adopting the conductance method instruction and the power output by the output end of the MPPT controller at the same time, and inputting the processed output signal to the voltage loop.
In one embodiment, after the step of inputting the voltage feedback signal output by the output terminal of the MPPT controller to the voltage loop, the method further includes:
and simultaneously carrying out PID control processing on the voltage output by the power loop to the voltage loop and the voltage output by the output end of the MPPT controller, and inputting the processed output signal to the current loop.
In one embodiment, after the step of inputting the current feedback signal output by the output terminal of the MPPT controller to the current loop, the method further includes:
and simultaneously carrying out PID control processing on the current output to the current loop by the voltage loop and the current output by the output end of the MPPT controller, and inputting the processed output signal to the MPPT controller.
A second aspect of the embodiment of the present application provides a power tracking system of a MPPT controller based on PID, including a power loop, a voltage loop, a current loop, and an MPPT controller;
the power loop, the voltage loop, the current loop and the MPPT controller are connected in sequence;
the input end of the power loop is used for receiving input power processed by adopting a conductance method and a power feedback signal output by the output end of the MPPT controller;
the input end of the voltage loop is used for receiving an output signal of the power loop and a voltage feedback signal output by the output end of the MPPT controller;
the input end of the current loop is used for receiving a current feedback signal output by the output end of the MPPT controller and an output signal of the voltage loop;
the MPPT controller is used for obtaining the maximum output power of the MPPT controller after correspondingly feeding back a power feedback signal, a voltage feedback signal and a current feedback signal to the power loop, the voltage loop and the current loop, and keeping the power supply of external equipment according to the maximum output power.
In one embodiment, the MPPT controller is configured to obtain a target voltage point of a maximum output power of the MPPT controller when the MPPT controller outputs a voltage signal to the voltage loop after the power loop performs PID control processing on the input power.
In one embodiment, the power loop is configured to perform PID control processing on the power processed by the conductance method instruction and the power output by the output terminal of the MPPT controller at the same time, and input the processed output signal to the voltage loop.
In one embodiment, the circuit loop is configured to perform PID control processing on the voltage output by the power loop to the voltage loop and the voltage output by the output terminal of the MPPT controller at the same time, and input the processed output signal to the current loop.
In one embodiment, the current loop is configured to perform PID control processing on a current output by the voltage loop to the current loop and a current output by an output terminal of the MPPT controller at the same time, and input a processed output signal to the MPPT controller.
According to the power tracking method and system of the MPPT controller based on the PID, the input power is subjected to conductance processing and then is output to the power loop, meanwhile, the feedback signal is added to each loop and is the feedback signal of the output end of the MPPT controller, so that the power loop, the voltage loop and the current loop can obtain the feedback signal, the PID control processing is carried out, the signals of the output ends of the power loop, the voltage loop and the current loop can be corrected to the maximum extent, the target voltage point of the maximum output power of the MPPT controller can be not required to be measured in advance under the condition, and the maximum output power of the MPPT controller can be directly, quickly and stably tracked.
Drawings
Fig. 1 is a flowchart illustrating a power tracking method of a PID-based MPPT controller according to a (preferred) embodiment of the present application;
FIG. 2 is a flow chart of a PID control algorithm in the power regulation method based on the AC output power supply apparatus shown in FIG. 1;
fig. 3 is a block diagram of a power tracking system of a MPPT controller based on PID according to an embodiment of the present invention.
Detailed Description
In order to make the technical problems, technical solutions and advantageous effects to be solved by the present application clearer, the present application is further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the present application and are not intended to limit the present application.
It will be understood that when an element is referred to as being "secured to" or "disposed on" another element, it can be directly on the other element or be indirectly on the other element. When an element is referred to as being "connected to" another element, it can be directly connected to the other element or be indirectly connected to the other element.
It will be understood that the terms "length," "width," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," and the like, refer to an orientation or positional relationship illustrated in the drawings for convenience in describing the present application and to simplify description, and do not indicate or imply that the referenced device or element must have a particular orientation, be constructed and operated in a particular orientation, and thus should not be construed as limiting the present application.
Furthermore, the terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of the present application, "a plurality" means two or more unless specifically limited otherwise.
Fig. 1 shows a flowchart of a power regulation method based on an ac output power supply device provided in an embodiment of the present application (fig. 1 shows a first embodiment of the present application), and for convenience of description, only the parts related to the present embodiment are shown, and the detailed description is as follows:
a power tracking method of an MPPT controller based on PID comprises the following steps:
step S110, setting a power loop, a voltage loop and a current loop of MPPT control, and connecting the power loop, the voltage loop, the current loop and the MPPT controller in sequence;
and sequentially connecting the power loop, the voltage loop, the current loop and the MPPT controller to form a finished feedback regulation loop.
The power loop, the voltage loop and the current loop can output a finally corrected signal to the MPPT controller after receiving the direct input signal and the feedback input signal so as to achieve a target voltage point required by the MPPT controller and further obtain the maximum output power of the MPPT controller.
Step S112, processing the input power by adopting a conductance method instruction, and outputting the processed input power to the power loop;
the treatment process by the conductance method is as follows:
the battery output power is P ═ UI, taking the derivative of U, we can get:
the formula of the P & O is substituted into the formula, and the formula can be obtained through deformation:
therefore, the power signal processed by adopting the conductance method can be obtained and output to the power loop.
Step S114, inputting a power feedback signal output by the output end of the MPPT controller to the power loop;
the MPPT controller is a final output terminal, and thus, the power feedback signal is acquired at the final output terminal to adjust and correct the input power of the power loop.
Step S116, inputting a voltage feedback signal output by the output end of the MPPT controller into the voltage loop;
the MPPT controller is a final output terminal, and thus, a voltage feedback signal is acquired at the final output terminal to adjust and correct the input voltage of the voltage loop.
Step S118, inputting a current feedback signal output by the output end of the MPPT controller into the current loop;
the MPPT controller is a final output terminal, and thus, a current feedback signal is obtained at the final output terminal to adjust and correct the input current of the current loop.
And step S120, acquiring the maximum output power of the MPPT controller after the processing by adopting the method.
After multiple feedback regulation is adopted, the maximum output power of the MPPT controller can adapt to any input system, and the maximum output power is kept. Because of the feedback control performed by all the node inputs of the MPPT controller, the optimal output power of the MPPT control can be quickly adjusted after the deviation occurs.
After the step of processing the input power by adopting the conductance method instruction and outputting the processed input power to the power loop, the method further comprises the following steps:
and after the power loop carries out PID control processing on the input power, outputting a voltage signal to the voltage loop so as to obtain a target voltage point of the maximum output power of the MPPT controller.
After the step of inputting the power feedback signal output from the output terminal of the MPPT controller to the power loop, the method further includes:
and performing PID control processing on the power processed by adopting the conductance method instruction and the power output by the output end of the MPPT controller at the same time, and inputting the processed output signal to the voltage loop.
After the step of inputting the voltage feedback signal output by the output terminal of the MPPT controller to the voltage loop, the method further includes:
and simultaneously carrying out PID control processing on the voltage output by the power loop to the voltage loop and the voltage output by the output end of the MPPT controller, and inputting the processed output signal to the current loop.
After the step of inputting the current feedback signal output by the output terminal of the MPPT controller to the current loop, the method further includes:
and simultaneously carrying out PID control processing on the current output to the current loop by the voltage loop and the current output by the output end of the MPPT controller, and inputting the processed output signal to the MPPT controller.
The MPPT controller respectively feeds back the power, the voltage and the current of the output end to the power loop, the voltage loop and the current loop, and can quickly perform feedback adjustment on the MPPT controller according to the input system, so that the MPPT controller can quickly respond to the input system without fixing the input system and measuring various parameters of the input system, can quickly respond to the maximum output power, cannot be interfered by the outside world and can stably work at the maximum output power all the time.
For example, the solar panels that access the above system are 100w output power. At the beginning, the power of the charged energy storage system is obtained in advance, processed by adopting a conductance method and then output to the power loop. And the power loop is processed and then output to a voltage loop and a current loop for sequential processing, and finally output to the MPPT controller. Because solar panel's output is not invariable, consequently, after solar panel's output input gives the power loop, can be rapid through power loop, voltage loop, current loop, finally feed back to power loop, voltage loop, current loop through the MPPT controller for solar panel's output can be rapid the maximize give energy storage equipment, improves the speed that solar energy turned into the electric energy, makes the MPPT controller work at optimum state all the time.
Fig. 3 is a block diagram of a power tracking system of a PID-based MPPT controller.
A power tracking system of MPPT controller based on PID comprises a power loop 301, a voltage loop 302, a current loop 303 and an MPPT controller 304;
the power loop 301, the voltage loop 302, the current loop 303 and the MPPT controller 304 are connected in sequence;
the input end of the power loop 301 is configured to receive input power processed by a conductance method and a power feedback signal output by the output end of the MPPT controller 304;
an input end of the voltage loop 302 is configured to receive an output signal of the power loop 301 and a voltage feedback signal output by an output end of the MPPT controller 304;
an input end of the current loop 303 is configured to receive a current feedback signal output by an output end of the MPPT controller 304 and an output signal of the voltage loop 302;
the MPPT controller 304 is configured to obtain a maximum output power of the MPPT controller after correspondingly feeding back a power feedback signal, a voltage feedback signal, and a current feedback signal to the power loop 301, the voltage loop 302, and the current loop 303, and maintain power supply to an external device with the maximum output power.
The MPPT controller 304 is configured to obtain a target voltage point of the maximum output power of the MPPT controller when the power loop 301 performs PID control processing on the input power and outputs a voltage signal to the voltage loop 302.
The power loop 301 is configured to perform PID control processing on the power processed by the conductance method instruction and the power output by the output terminal of the MPPT controller 304 at the same time, and input the processed output signal to the voltage loop 302.
The circuit loop is configured to perform PID control processing on the voltage output from the power loop 301 to the voltage loop 302 and the voltage output from the output terminal of the MPPT controller 304 at the same time, and input the processed output signal to the current loop 303.
The current loop 303 is configured to perform PID control processing on the current output from the voltage loop 302 to the current loop 303 and the current output from the output terminal of the MPPT controller 304 at the same time, and input the processed output signal to the MPPT controller 304.
The power tracking method and system of the MPPT controller based on the PID carry out conductance method on input power and then output the input power to the power loop 301, meanwhile, a feedback signal is added to each loop and is a feedback signal of the output end of the MPPT controller 304, so that the power loop 301, the voltage loop 302 and the current loop 303 can obtain feedback signals, PID control processing is carried out, signals of the output ends of the power loop 301, the voltage loop 302 and the current loop 303 can be corrected to the maximum extent, and under the condition, the maximum output power of the MPPT controller 304 can be directly, quickly and stably tracked without measuring a target voltage point of the maximum output power of the MPPT controller 304 in advance.
It will be apparent to those skilled in the art that, for convenience and brevity of description, only the above-mentioned division of the functional units and modules is illustrated, and in practical applications, the above-mentioned function distribution may be performed by different functional units and modules according to needs, that is, the internal structure of the apparatus is divided into different functional units or modules to perform all or part of the above-mentioned functions. Each functional unit and module in the embodiments may be integrated in one processing unit, or each unit may exist alone physically, or two or more units are integrated in one unit, and the integrated unit may be implemented in a form of hardware, or in a form of software functional unit. In addition, specific names of the functional units and modules are only for convenience of distinguishing from each other, and are not used for limiting the protection scope of the present application. The specific working processes of the units and modules in the system may refer to the corresponding processes in the foregoing method embodiments, and are not described herein again.
In the above embodiments, the descriptions of the respective embodiments have respective emphasis, and reference may be made to the related descriptions of other embodiments for parts that are not described or illustrated in a certain embodiment.
Those of ordinary skill in the art will appreciate that the various illustrative elements and algorithm steps described in connection with the embodiments disclosed herein may be implemented as electronic hardware or combinations of computer software and electronic hardware. Whether such functionality is implemented as hardware or software depends upon the particular application and design constraints imposed on the implementation. Skilled artisans may implement the described functionality in varying ways for each particular application, but such implementation decisions should not be interpreted as causing a departure from the scope of the present application.
In the embodiments provided in the present application, it should be understood that the disclosed apparatus/terminal device and method may be implemented in other ways. For example, the above-described embodiments of the apparatus/terminal device are merely illustrative, and for example, the division of the modules or units is only one logical division, and there may be other divisions when actually implemented, for example, a plurality of units or components may be combined or integrated into another system, or some features may be omitted, or not executed. In addition, the shown or discussed mutual coupling or direct coupling or communication connection may be an indirect coupling or communication connection through some interfaces, devices or units, and may be in an electrical, mechanical or other form.
The units described as separate parts may or may not be physically separate, and parts displayed as units may or may not be physical units, may be located in one place, or may be distributed on a plurality of network units. Some or all of the units can be selected according to actual needs to achieve the purpose of the solution of the embodiment.
In addition, functional units in the embodiments of the present application may be integrated into one processing unit, or each unit may exist alone physically, or two or more units are integrated into one unit. The integrated unit can be realized in a form of hardware, and can also be realized in a form of a software functional unit.
The integrated modules/units, if implemented in the form of software functional units and sold or used as separate products, may be stored in a computer readable storage medium. Based on such understanding, all or part of the flow in the method of the embodiments described above can be realized by a computer program, which can be stored in a computer-readable storage medium and can realize the steps of the embodiments of the methods described above when the computer program is executed by a processor. . Wherein the computer program comprises computer program code, which may be in the form of source code, object code, an executable file or some intermediate form, etc. The computer-readable medium may include: any entity or device capable of carrying the computer program code, recording medium, usb disk, removable hard disk, magnetic disk, optical disk, computer Memory, Read-Only Memory (ROM), Random Access Memory (RAM), electrical carrier wave signals, telecommunications signals, software distribution medium, and the like. It should be noted that the computer readable medium may contain content that is subject to appropriate increase or decrease as required by legislation and patent practice in jurisdictions, for example, in some jurisdictions, computer readable media does not include electrical carrier signals and telecommunications signals as is required by legislation and patent practice.
The above-mentioned embodiments are only used for illustrating the technical solutions of the present application, and not for limiting the same; although the present application has been described in detail with reference to the foregoing embodiments, it should be understood by those of ordinary skill in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; such modifications and substitutions do not substantially depart from the spirit and scope of the embodiments of the present application and are intended to be included within the scope of the present application.
Claims (10)
1. A power tracking method of an MPPT controller based on PID is characterized by comprising the following steps:
setting a power loop, a voltage loop and a current loop of MPPT control, and connecting the power loop, the voltage loop, the current loop and the MPPT controller in sequence;
processing the input power by adopting a conductance method instruction, and outputting the processed input power to the power loop;
inputting a power feedback signal output by an output end of the MPPT controller to the power loop;
inputting a voltage feedback signal output by an output end of the MPPT controller to the voltage loop;
inputting a current feedback signal output by an output end of the MPPT controller to the current loop;
after the processing is carried out by adopting the method, the maximum output power of the MPPT controller is obtained.
2. The method for power tracking of a PID-based MPPT controller of claim 1, further comprising after the step of processing the input power with conductance instructions and outputting to the power loop:
and after the power loop carries out PID control processing on the input power, outputting a voltage signal to the voltage loop so as to obtain a target voltage point of the maximum output power of the MPPT controller.
3. The method for power tracking of a PID-based MPPT controller of claim 1, further comprising, after the step of inputting the power feedback signal output from the output of the MPPT controller to the power loop:
and performing PID control processing on the power processed by adopting the conductance method instruction and the power output by the output end of the MPPT controller at the same time, and inputting the processed output signal to the voltage loop.
4. The method for power tracking of a PID-based MPPT controller of claim 1, further comprising, after the step of inputting the voltage feedback signal output by the output of the MPPT controller to the voltage loop:
and simultaneously carrying out PID control processing on the voltage output by the power loop to the voltage loop and the voltage output by the output end of the MPPT controller, and inputting the processed output signal to the current loop.
5. The method for power tracking of a PID-based MPPT controller of claim 1, further comprising, after the step of inputting the current feedback signal output by the output of the MPPT controller to the current loop:
and simultaneously carrying out PID control processing on the current output to the current loop by the voltage loop and the current output by the output end of the MPPT controller, and inputting the processed output signal to the MPPT controller.
6. A power tracking system of an MPPT controller based on PID is characterized by comprising a power loop, a voltage loop, a current loop and an MPPT controller;
the power loop, the voltage loop, the current loop and the MPPT controller are connected in sequence;
the input end of the power loop is used for receiving input power processed by adopting a conductance method and a power feedback signal output by the output end of the MPPT controller;
the input end of the voltage loop is used for receiving an output signal of the power loop and a voltage feedback signal output by the output end of the MPPT controller;
the input end of the current loop is used for receiving a current feedback signal output by the output end of the MPPT controller and an output signal of the voltage loop;
the MPPT controller is used for obtaining the maximum output power of the MPPT controller after correspondingly feeding back a power feedback signal, a voltage feedback signal and a current feedback signal to the power loop, the voltage loop and the current loop, and keeping the power supply of external equipment according to the maximum output power.
7. The power tracking system of the PID-based MPPT controller of claim 6, wherein the MPPT controller is configured to obtain a target voltage point of its own maximum output power when the power loop outputs a voltage signal to the voltage loop after performing PID control processing on the input power.
8. The power tracking system for the MPPT controller based on PID as claimed in claim 6, wherein the power loop is used to perform PID control process to the power processed by conductance method instruction and the power outputted from the output terminal of the MPPT controller at the same time, and input the processed output signal to the voltage loop.
9. The system as set forth in claim 6, wherein the circuit loop is configured to perform PID control processing on the voltage output by the power loop to the voltage loop and the voltage output by the MPPT controller at the output terminal, and to input the processed output signal to the current loop.
10. The system as set forth in claim 6, wherein the current loop is configured to perform PID control processing on the current output by the voltage loop to the current loop and the current output by the MPPT controller at the same time, and to input the processed output signal to the MPPT controller.
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| CN108667072A (en) * | 2018-05-21 | 2018-10-16 | 合肥工业大学 | Photovoltaic combining inverter control method based on reserve |
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| US8970068B2 (en) * | 2011-02-10 | 2015-03-03 | Draker, Inc. | Pseudo-random bit sequence generation for maximum power point tracking in photovoltaic arrays |
| CN102436285A (en) * | 2011-11-16 | 2012-05-02 | 深圳航天科技创新研究院 | Method and device for tracking maximum power point of photovoltaic array |
| CN104753057A (en) * | 2015-04-22 | 2015-07-01 | 哈尔滨工业大学 | Seamless switching method for running modes of photovoltaic power generation unit in direct-current microgrid |
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