Compound control method for fast and accurate tracking control of maximum power point of photovoltaic power generation system

A photovoltaic power generation system and maximum power point technology, which is applied in the directions of optical radiation generators, control/regulation systems, generators/motors, etc., which can solve the problem of poor MPPT control accuracy and control adaptability, inability to track maximum power, and high control system requirements. Advanced problems, to achieve the effect of fast tracking, economical and reliable, and improve tracking efficiency

Inactive Publication Date: 2010-11-03
SUZHOU VOCATIONAL UNIV
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Problems solved by technology

At present, the common maximum power point tracking control methods include constant voltage control method, disturbance observation method and admittance increment method, etc., but different methods have different advantages and disadvantages in actual use.
The constant voltage control method is a simplified maximum power point tracking method. Its advantage is that the control is simple and easy to implement. However, this tracking method ignores the influence of temperature on the output voltage

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  • Compound control method for fast and accurate tracking control of maximum power point of photovoltaic power generation system
  • Compound control method for fast and accurate tracking control of maximum power point of photovoltaic power generation system
  • Compound control method for fast and accurate tracking control of maximum power point of photovoltaic power generation system

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Embodiment Construction

[0013] Such as figure 1 Shown is the block diagram of the control system of the present invention. In the figure, the working parameters output voltage, current and working temperature of the photovoltaic module are input to the A / D conversion interface of the control chip MCU after being sampled and processed by the circuit. Comparing the previous moment, the power error is obtained. If the error is greater than or equal to the set threshold, the improved constant pressure control method is selected, and the parameters are corrected in combination with the collected working temperature; if the error is smaller than the set threshold, the The admittance incremental method is selected for control; the control output changes the register value of the PWM signal generator, thereby changing the duty cycle, adjusting and controlling the parameters of the DC / DC conversion circuit, and realizing maximum power tracking control.

[0014] Such as figure 2 As shown, the specific imple...

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Abstract

The invention relates to a compound control method for the fast and accurate tracking control of the maximum power of a photovoltaic power generation system The photovoltaic power generation system samples the output voltage upv, the current ipv and the working temperature T of the current time of a photovoltaic battery array in real time; photovoltaic output power Ppv (k) is calculated on line and compared with the power Ppv (k-1) of previous time; and if power deviation is larger than a set error range e, a controller fast regulates the output voltage upv by adopting a constant voltage improvement control method till the output power deviation is smaller than the set error range e and then carries out the further accurate tracking control of the maximum power by adopting an admittance incremental method till power error is approximately equal to zero, therefore the purpose of the fast tracking control is achieved. The compound control method can be applied to a photovoltaic power generation MPPT (Maximum Power Point Tracking) control system controlled by adopting an MCU (Microprogrammed Control Unit) or DSP (Digital Signal Processor) chip and has the characteristics of fast response and accurate control.

Description

technical field [0001] The invention relates to a control system for solar photovoltaic power generation, in particular to a compound control method for quickly and accurately tracking the maximum power point of a photovoltaic power generation system. Background technique [0002] In recent years, solar photovoltaic power generation technology has developed rapidly. Due to the obvious nonlinear output characteristics of photovoltaic cells, the maximum power can only be output at a certain voltage. In order to improve the energy conversion efficiency of the system, an appropriate maximum power point tracking algorithm (MPPT) must be used to control the photovoltaic power generation converter to ensure that the system Always operate at the maximum power point of the PV array. At present, the common maximum power point tracking control methods include constant voltage control method, disturbance observation method and admittance increment method, etc., but different methods ha...

Claims

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Application Information

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IPC IPC(8): H02N6/00G05F1/67
Inventor 汪义旺曹丰文
Owner SUZHOU VOCATIONAL UNIV
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