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CN-121979358-A - Maximum power point tracking method and related device

CN121979358ACN 121979358 ACN121979358 ACN 121979358ACN-121979358-A

Abstract

The application is applicable to the technical field of photovoltaic power generation, and provides a maximum power point tracking method and a related device applied to a photovoltaic solar power generation system provided with a 3P3Z compensator, which are used for realizing rapid and stable tracking of the maximum power point of the photovoltaic solar power generation system, wherein the method mainly comprises the steps of obtaining the output voltage of a photovoltaic matrix of the photovoltaic power generation system And output current Based on the output voltage And output current Generating a voltage reference value using a preset maximum power point tracking algorithm Calculating a voltage reference value And output voltage The voltage difference Voltage difference is then measured Inputting into 3P3Z compensator for operation to obtain current reference value Calculating a current reference value And output current The current difference By differentiating the current The input proportional-integral controller performs operation to generate a control signal, generates a PWM waveform according to the control signal, and drives the DC-DC converter to output target power to the load through the PWM waveform.

Inventors

  • CHAO JIAN
  • LIANG YONGZHI

Assignees

  • 深圳市奋达科技股份有限公司

Dates

Publication Date
20260505
Application Date
20260112

Claims (10)

  1. 1. A maximum power point tracking method, characterized by being applied to a photovoltaic solar power generation system equipped with a 3P3Z compensator, comprising: obtaining output voltage of a photovoltaic matrix of the photovoltaic power generation system And output current ; Based on the output voltage And the output current Generating a voltage reference value using a preset maximum power point tracking algorithm ; Calculating the voltage reference value And the output voltage Is a voltage difference of (2) ; Subjecting the voltage difference to Inputting into 3P3Z compensator for operation to obtain current reference value ; Calculating the current reference value And the output current Is the current difference of (2) ; Difference the current Inputting the proportional-integral controller to operate, and generating a control signal; Generating a PWM waveform according to the control signal; And driving a DC-DC converter to output target power to a load through the PWM waveform.
  2. 2. The method of claim 1, wherein the output voltage of the photovoltaic matrix of the photovoltaic power generation system is obtained And output current Comprising the following steps: Acquiring output voltage of a photovoltaic matrix of the photovoltaic power generation system in real time by adopting a circuit And output current 。
  3. 3. The maximum power point tracking method of claim 1, wherein the tracking method is based on the output voltage And the output current Generating a voltage reference value using a preset maximum power point tracking algorithm Comprising the following steps: calculating the output voltage And the output current Is of the actual output power of (a) ; Determining the actual output power from a preset power-voltage curve Corresponding voltage reference value 。
  4. 4. The method of claim 1, wherein the predetermined maximum power point tracking algorithm is a conductance delta method.
  5. 5. The maximum power point tracking method of claim 1, wherein the transfer function of the 3P3Z compensator is represented in the digital domain as follows: Wherein, K represents gain, and Representing complex variables; The said The said The said Respectively representing three zero points of the 3P3Z compensator; The said The said The said Representing the three poles of the 3P3Z compensator, respectively.
  6. 6. The maximum power point tracking method of claim 1, wherein the transfer function of the proportional-integral controller is expressed in the digital domain as follows: Wherein the said Representing a proportional gain, said Representing an integral gain, said Representing the laplace variable.
  7. 7. A maximum power point tracking device, characterized by being applied to a photovoltaic solar power generation system equipped with a 3P3Z compensator, comprising: an acquisition unit for acquiring output voltage of a photovoltaic matrix of the photovoltaic power generation system And output current ; A generation unit for based on the output voltage And the output current Generating a voltage reference value using a preset maximum power point tracking algorithm ; A calculation unit for calculating the voltage reference value And the output voltage Is a voltage difference of (2) ; An operation unit for comparing the voltage difference Inputting into 3P3Z compensator for operation to obtain current reference value ; The calculating unit is also used for calculating the current reference value And the output current Is the current difference of (2) ; The operation unit is also used for differentiating the current Inputting the proportional-integral controller to operate, and generating a control signal; The generating unit is further used for generating a PWM waveform according to the control signal; And the output unit is used for driving the DC-DC converter to output target power to the load through the PWM waveform.
  8. 8. A computer device is characterized by comprising a processor, a memory and a bus; The processor is connected with the memory through a bus, and the memory stores programs; The maximum power point tracking method according to any one of claims 1 to 6 is implemented when the processor executes the program stored in the memory.
  9. 9. A computer storage medium having instructions stored therein, which when executed on a computer, cause the computer to perform the maximum power point tracking method of any one of claims 1 to 6.
  10. 10. A computer program product, which when executed on a computer causes the computer to perform the string maximum power point tracking method of any one of claims 1 to 6.

Description

Maximum power point tracking method and related device Technical Field The application belongs to the technical field of photovoltaic power generation, and particularly relates to a maximum power point tracking method and a related device applied to a photovoltaic solar power generation system provided with a 3P3Z compensator. Background Maximum power point tracking (Maximum power point tracking, MPPT) is mainly used in the photovoltaic solar power generation process, and aims to pursue the maximum power output of a photovoltaic array of a photovoltaic solar power generation system as possible under various conditions. The power generation output efficiency of the photovoltaic solar power generation system has a nonlinear relation with the environment temperature, the total circuit resistance and the like in the power generation process of the photovoltaic solar power generation system, and the power generation output efficiency can be represented by a current-voltage characteristic curve. The aim of maximum power point tracking is to sample the output of the photovoltaic solar power generation system and to try to maintain maximum power output under any environmental conditions. Maximum power point tracking devices are typically integrated into power conversion devices, which include voltage or current conversion, filtering, and redrive loads such as grids, batteries, or motors. The power (Pmpp) of the maximum power point is the product of the maximum power point voltage (Vmpp) and the current (Impp). The output characteristics of the photovoltaic solar power generation system have nonlinear characteristics, and the maximum power point of the photovoltaic solar power generation system drifts along with the change of external conditions such as illumination intensity, ambient temperature and the like. In order to enable the photovoltaic solar power generation system to always output the maximum power, the maximum power point tracking technology is important. The traditional maximum power point tracking algorithm, such as a conductivity increment method, a disturbance observation method and the like, has the contradiction between tracking speed and steady-state precision, namely the tracking step is long and has fast response but large oscillation, and the tracking step is small and has small oscillation but slow response. In addition, these conventional maximum power point tracking algorithms are prone to misjudge the maximum power point when the illumination changes rapidly (e.g., cloud skimming), resulting in power loss. Disclosure of Invention The application aims to provide a maximum power point tracking method and a related device, which are applied to a photovoltaic solar power generation system provided with a 3P3Z compensator, and can be used for quickly and stably tracking the maximum power point of the photovoltaic solar power generation system. In a first aspect, the present application provides a maximum power point tracking method applied to a photovoltaic solar power generation system equipped with a 3P3Z compensator, comprising: obtaining output voltage of a photovoltaic matrix of the photovoltaic power generation system And output current; Based on the output voltageAnd the output currentGenerating a voltage reference value using a preset maximum power point tracking algorithm; Calculating the voltage reference valueAnd the output voltageIs a voltage difference of (2); Subjecting the voltage difference toInputting into 3P3Z compensator for operation to obtain current reference value; Calculating the current reference valueAnd the output currentIs the current difference of (2); Difference the currentInputting the proportional-integral controller to operate, and generating a control signal; Generating a PWM waveform according to the control signal; And driving a DC-DC converter to output target power to a load through the PWM waveform. Optionally, obtaining an output voltage of a photovoltaic matrix of the photovoltaic power generation systemAnd output currentComprising the following steps: Acquiring output voltage of a photovoltaic matrix of the photovoltaic power generation system in real time by adopting a circuit And output current。 Optionally, based on the output voltageAnd the output currentGenerating a voltage reference value using a preset maximum power point tracking algorithmComprising the following steps: calculating the output voltage And the output currentIs of the actual output power of (a); Determining the actual output power from a preset power-voltage curveCorresponding voltage reference value。 Optionally, the preset maximum power point tracking algorithm is a conductivity increment method. Optionally, the transfer function of the 3P3Z compensator is expressed in the digital domain as follows: Wherein, K represents gain, and Representing complex variables; The said The saidThe saidRespectively representing three zero points of the 3P3Z compensator; The said The saidThe saidRep