How does an inverter work?

Inverter is a device that converts DC power into AC power, and it is the core component of solar photovoltaic power generation system. According to the product design, it can be divided into sine wave inverters dedicated to solar photovoltaic power generation and economical solar photovoltaic power generation control inverter all-in-one machines.

The basic working block diagram of the sine wave inverter for solar photovoltaic power generation is shown in Figure 1-1. Its performance characteristics include: DSP chip control, intelligent power module assembly, pure sine wave output, output voltage stabilization, frequency stabilization, and various protection functions such as overvoltage, undervoltage, overload, short circuit, and input polarity reverse connection. Its inverter efficiency is not less than 85%, and it has AC bypass function. Its input/output has excellent EMI/EMC indexes. It can be equipped with RS-232/485 interface and has high reliability.

The 32-bit CPU of the TMS320C2000DSP core operates at the highest frequency of 150MHz, which can efficiently execute the high-precision algorithms required to operate the panel at the maximum power point, ensuring the highest power conversion efficiency. The DC/AC main bridge is driven by the PWM module of the TMS320C2000DSP device, and is used in conjunction with the on-chip high-speed 12-bit ADC to adjust the output voltage and current to obtain a sinusoidal waveform AC output. The TMS320C2000DSP on-chip high-speed 12-bit ADC can parallel A/D conversion of solar cell voltage, battery temperature, ambient temperature and analog quantities of metering counter. The DC/DC conversion link adjusts the working point of the photovoltaic array to track the maximum power

Rate point. Therefore, a Boost booster is installed at the output end of the solar cell to raise the voltage to 400V. This design is conducive to improving the efficiency of the system.

The maximum power output by the solar cell changes with the change of light intensity and temperature. The maximum power tracking of the system is controlled by the front-stage Boost wave breaker, while the control of the Boost wave breaker and the full-bridge inverter is coordinated by DSP chip TMS320C2000DSP. The performance characteristics of this design scheme are as follows.

(1) DSC chip control and intelligent power module assembly.

(2) MPPT control mode tracks the maximum output power of solar cells in a timely manner.

(3) Pure sine wave output, the current harmonic content is small.

(4) It has disturbance detection technology to realize automatic control of the operation process.

(5) It adopts LCD and LED display functions, and has complete protection and alarm functions.

(6) RS-232/485 communication to realize remote data acquisition and monitoring.