Control strategy of inverter

The control strategy of the inverter is the key to achieving stable and efficient output. Here are several common inverter control strategies:

1. Voltage type control: By controlling the switching time of the switching device, the output voltage tracks the given voltage reference value. Voltage type control has the advantages of fast response speed and high control accuracy, but it causes significant harmonic pollution to the power grid.
2. Current type control: By controlling the switching time of the switching device, the output current tracks the given current reference value. Current type control has good harmonic suppression ability, but the response speed is slow and the control accuracy is low.
3. Hybrid control: Combining the advantages of voltage type control and current type control, it achieves simultaneous control of the output voltage and current of the inverter. Hybrid control has the advantages of fast response speed, high control accuracy, and low harmonic pollution, but the control algorithm is relatively complex.
   Stability and accuracy of inverter output frequency
   The stability and accuracy of the inverter output frequency are important indicators for measuring its performance. The following are methods to improve the stability and accuracy of inverter output frequency:
4. Adopting high-performance switching devices: Choosing switching devices with high switching speed and low on resistance can increase the output frequency of the inverter.
5. Optimization control algorithm: By optimizing the control algorithm, the adaptability of the inverter to external factors such as input power fluctuations and load changes can be improved, thereby enhancing the stability of the output frequency.
6. Introducing feedback regulation: By introducing feedback signals such as output voltage and current, real-time adjustment of the inverter output frequency can be achieved, improving frequency accuracy.
7. Adopting advanced filtering technology: High performance filters such as LC filters, π – type filters, etc. are used to filter out high-frequency components in PWM signals and improve the stability of output frequency.