High-precision timing method and device, and photovoltaic power grid inverter control method and device

Abstract

The invention provides a high-precision timing method and device and a photovoltaic power grid inverter control method and device.According to the high-precision timing method, a timing period is divided into a decimal part and an integer part, a control unit measures the decimal part with millisecond as the precision, and a real-time clock measures the integer part with second as the precision; therefore, long-time high-precision timing is realized.

Description

technical field [0001] The invention relates to timing technology in the field of industrial control, and in particular to a high-precision timing method and device, and a photovoltaic grid inverter control method and device. Background technique [0002] Nowadays, more and more industrial control fields require time-accurate calculation of fault information. When the operating conditions of the machine deviate from the normal value, within a certain time range, the machine should keep running normally, but if the threshold time is exceeded, the machine must stop immediately. This process requires the machine to accurately time the deviated operating conditions. [0003] The existing timing method is usually executed by the timer in the control unit (Microcontroller Unit, MCU), but during the timing process of the master control MCU, because the foreground system will trigger external interrupts and exceptions, the MCU timer timing cycle is interrupted, and Each interruptio...

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Problems solved by technology

[0003] Existing timing method is usually carried out by the timer in the control unit (Microcontroller Unit, MCU), but in the main control MCU timing process, because the foreground system can trigger external interrupt and abnormal, cause the MCU timer timing cycle to be interrupted, and Each interruption may cause the actual timing time to be too long, which affects the timing accuracy

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