Automatic quasi synchronization is achieved by utilizing the principles of frequency difference check, pressure difference check, and constant lead time. It is synthesized through a time program and logic circuit according to a certain control strategy, and can perfectly meet the basic requirements of quasi synchronization parallelism. Abbreviated as ASA. The automatic quasi synchronous device is a specialized automatic device. Automatically monitor voltage and frequency differences, analyze and calculate the appropriate synchronization time, and issue a closing command one lead time in advance to ensure the completion of synchronization and grid connection at the ideal angle, so that the circuit breaker can close at a phase angle difference of 0 °. The microcomputer automatic quasi synchronization device has been able to achieve the first synchronization at the same phase point after starting the synchronization. The device is equipped with automatic voltage and frequency adjustment units, which emit control pulses when the voltage and frequency differences do not meet the conditions. If the frequency difference does not meet the requirements, automatically adjust the speed of the original power, increase or decrease the frequency, and promote the arrival of synchronization; If the voltage difference does not meet the requirements, automatically adjust the voltage of the generator to make the voltage close to the system voltage
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