Rotating vector detection method without phase-locked loop suitable for grid voltage distortion and unbalance

Abstract

The invention discloses a non-phase-locked loop rotation vector detection method suitable for grid voltage distortion and unbalance, which is completed according to the following steps: the grid in a distorted and unbalanced state is collected through voltage Hall components and current Hall components respectively The instantaneous value of the voltage and load current; the instantaneous value of the grid voltage and load current processed by the conditioning circuit is converted into a digital signal by the A / D module and input into the DSP processor; the DSP processor passes the digital grid voltage and load The current instantaneous value is processed to detect specific sub-harmonic components; the DSP processor detects reactive and active components based on the detected specific sub-harmonic components. The invention is applicable to the non-phase-locked loop rotation vector detection method with distorted and unbalanced grid voltage, and solves the problems in the prior art that the detection process is complicated, the detection result is interfered by the voltage frequency deviation, and the specified harmonic current cannot be accurately detected. .

Description

technical field [0001] The invention belongs to the technical field of power systems, and relates to a phase-locked loop-free rotation vector detection method suitable for grid voltage distortion and imbalance. Background technique [0002] Due to the large use of nonlinear or unbalanced loads such as motor speed control devices, electric welding machines, and electric arc furnaces in the current power grid, a large amount of reactive power, negative sequence and harmonic currents are absorbed into the power grid, resulting in current and common connection points (Point of Common Coupling) , PCC) voltage is distorted or unbalanced, which will cause the efficiency and power factor of the power grid system to decrease, the malfunction of electronic equipment and the reduction of service life, etc. , negative sequence and harmonic components and suppress them to solve the above power quality problems. In addition, for the wide-area measurement system of the power system, fast ...

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Problems solved by technology

[0004] The purpose of the present invention is to provide a phase-locked loop-free rotating vector detection (Rotating Vector Detection, RVD) method suitable for grid voltage distortion and unbalance, which solves the problems in the prior art that the detection process is complex and the detection results are frequently affected by voltage. The problem of partial interference and the inability to accurately detect the specified sub-harmonic current

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