Voltage phase sequence self-recognition and self-adaption device and method embedded in active power filter

Abstract

The invention discloses a voltage phase sequence self-recognition and self-adaption device and method embedded in an active power filter. The system comprises a system voltage conditioning module, a system current conditioning module, an emitted current conditioning module, a second-order low-pass filtering orthogonal module, a phase discrimination module, a second-order direct current and alternating current switching module, a phase sequence judgment module, a voltage phase sequence switching module, a system current phase sequence switching module and an emitted current phase sequence switching module. According to the invention, a second-order low-pass filter and a second-order direct current and alternating current passing and blocking module are adopted, so that the influence of harmonic waves and interference on phase sequence judgment is eliminated; hysteresis comparison is adopted as the basis of commutation judgment, it is guaranteed that commutation judgment is accurate and reliable within the normal voltage range, when the voltage is abnormal, original normal judgment is kept, and the anti-interference performance of phase sequence judgment is improved.

Description

technical field [0001] The invention relates to a voltage phase sequence self-recognition self-adaptation device and method, in particular to a voltage phase sequence self-recognition self-adaptation device and method embedded in an active power filter, belonging to the technical field of power electronic converters. Background technique [0002] In the field of electronic converters, no matter the frequency converter or the active power filter, it is necessary to detect the phase sequence of the three-phase voltage. If the wiring of these converters is out of order, it will lead to problems that the equipment cannot operate normally. For example, the motor of the inverter is reversed, and the active power filter cannot stabilize the DC side voltage, resulting in equipment failure or even damage. [0003] At present, the commonly used voltage phase sequence detection methods are mainly zero-crossing detection method, fundamental wave phase angle calculation and comparison me...

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Problems solved by technology

The existing processing technology increases the difficulty of installation and reduces the efficiency of installation work

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