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1. According to the control mode, it can be divided into manual and automatic parallel systems; according to the installation type, it can be divided into two parallel systems: airborne and split;
2. The manual parallel operation system is equipped with synchronous detection device, reverse power protection device and overload protection device. The voltage and frequency are adjusted manually, with ATS automatic control function;
3. The automatic parallel machine system adopts the imported or domestic automatic parallel modules such as deep sea, comp, etc., which can automatically adjust the voltage, frequency and phase angle, automatically detect the synchronization, automatically control the closing and opening of the circuit breaker, and automatically balance the active and reactive load.