What functions does the power inverter control system include

The control system of power inverter is the intelligent core of the entire system. It is responsible for monitoring, regulating and controlling all stages of the inverter to ensure the quality, stability and efficiency of the output AC power.

Microcontroller or DSP:

The control system usually uses a microcontroller or digital signal processor (DSP) as the main control chip. These chips have a high degree of computing and control capabilities and are capable of executing complex algorithms and logic control. Microcontrollers are usually used for simpler applications, while for applications that require higher performance, such as high-performance inverters or industrial-grade applications, DSPs are often chosen.

System Parameter Measurement and Sensors:

Control systems rely on sensors to measure system parameters such as output current, output voltage, DC supply voltage, etc. The accuracy of these sensors is critical to achieving closed-loop control and keeping the output waveform stable.

Closed-Loop Control Loops:

The control system adopts a closed-loop control loop, which is divided into two main aspects: current control and voltage control. Current closed-loop control is usually used to ensure that the inverter output current meets a specified target value, while voltage closed-loop control is used to maintain the output voltage within a predetermined range. These two control loops achieve precise control of the output by comparing the actual measured value with the target value and adjusting the pulse width modulation signal.

Pulse Width Modulation (PWM):

The control system uses pulse width modulation technology to adjust the on-time of the switching device to control the amplitude of the output waveform. The generation of PWM signals usually involves comparators, triangle wave generators and control logic. By adjusting the pulse width, the control system can achieve precise regulation of the output voltage.

Frequency Locking and Synchronization:

In some applications, especially in grid-connected inverters, frequency locking and synchronization is crucial. The control system needs to ensure that the output frequency of the inverter is synchronized with the frequency of the grid in order to achieve effective injection or extraction of electrical energy. This often requires the use of specialized synchronization control algorithms.

Overcurrent and Overvoltage Protection:

The control system also includes overcurrent and overvoltage protection features to prevent damage to the inverter and connected equipment during abnormal system operating conditions. These protection mechanisms ensure system safety and reliability by monitoring current and voltage and cutting off the output when set thresholds are reached.

Communication Interface:

Control systems often also include communication interfaces to communicate with other systems or monitoring equipment. This can include a serial communication interface (such as RS-485) or an Ethernet interface, allowing users to remotely monitor and control the operating status of the inverter.