Non-phase-locked-loop rotating vector detection method suitable for power grid voltage distortion and imbalance

The invention discloses a non-phase-locked-loop rotating vector detection method suitable for power grid voltage distortion and imbalance. The method is completed according to the following steps that power grid voltage and load current instantaneous values under the distortion and imbalance state are acquired via voltage Hall components and parts and current Hall components and parts respectively; the power grid voltage and load current instantaneous values processed by a conditioning circuit are converted into digital signals by an A/D module and then inputted to a DSP processor; the digital values of the power grid voltage and load current instantaneous values are processed by the DSP processor so that a specific time of harmonic component is obtained via detection; and reactive and active components are obtained via detection by the DSP processor according to the specific time of harmonic component obtained via detection. According to the non-phase-locked-loop rotating vector detection method suitable for power grid voltage distortion and imbalance, problems in the prior art that the detection process is complex, detection results are interfered by voltage frequency deviation and the specific time of harmonic current cannot be accurately detected are solved.