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Home > News > Industry News > Tracking core technology


Tracking core technology

  • Author:I-PANDA
  • Source:I-PANDA
  • Release on:2018-12-19
The circuit topology of the solar inverter, in principle, involves a boost chopper, adjusting the panel by adjusting the duty cycle of the switching device
The equivalent load impedance enables maximum power tracking of the panel. The commonly used MTTP method interferes with the observation method.

The interference observation method increases or decreases the voltage at regular intervals, and determines the next control signal by observing the power change direction. in case
As the output power increases, continue to change the voltage according to the direction of the voltage change in the previous step. If the output power is detected to decrease, change the voltage.
The direction of change so that the actual operating point of the PV array can gradually approach the current maximum power point. If using a DC/DC converter
MPPT control, in the specific implementation should be adjusted by the duty cycle to adjust the PV array output voltage or current, so as to achieve the most tracking
The purpose of high power points. If the step size is “interfered” with a larger step size, this tracking algorithm can achieve faster tracking speed.
Degree, but after reaching steady state, the actual operating point of the PV array is relatively large near the maximum power point, causing a certain power loss.
Using a smaller step size is just the opposite. The conductance change rate of the array is made equal to the negative conductance value. First assume that the PV array works in one
Set the working point and then sample the voltage and current of the PV array. The biggest advantage of this tracking method is when the light intensity of the photovoltaic cell occurs.
When changing, the output voltage can follow its change in a smooth manner, and the voltage fluctuation is smaller than the disturbance observation method. The disadvantage is that the algorithm is more complicated.
The hardware requirements, especially the accuracy requirements of the detection components, are relatively high, so the hardware cost of the entire system will be relatively high.

Photovoltaic inverters have high requirements for power factor. In order to accurately achieve high power factor inverter, it is necessary to control the output current.
The current control method is direct current control, giving current command and directly collecting output current feedback. This control method controls accuracy.
High, accurate, and widely used.