1) Performance G1 level - This level is required to be applicable to loads that only require the basic parameters of voltage and frequency to be specified. Generally used for lighting and other simple electrical equipment.

2) Performance G2 level - This level is required to apply to loads that have the same voltage characteristics as the public power system. When the load changes, there may be allowed brief voltage and frequency deviations. Generally used for lighting systems, pumps, fans, and hoists.

 3) Performance G3 level - This level is required for electrical equipment that has strict requirements for frequency, voltage, and waveform characteristics. Generally used for loads controlled by radio communication and thyristor rectifiers. Special attention should be paid to the special consideration of the impact of the load on the voltage waveform of the generator for both rectifier and thyristor rectifier controlled loads. 

4) Performance G4 level - This level is required to be applicable to loads with particularly strict requirements for frequency, voltage, and waveform characteristics. Generally used for data processing equipment or computer control systems, etc.