Unified power quality conditioner and method for using unified power quality conditioner to detect harmonic distortion amount

Abstract

The invention discloses a unified power quality conditioner. The unified power quality conditioner comprises a voltage and current collection module, an analog-to-digital conversion module, a DSP operation control module, a drive level conversion module and a main circuit which is composed of a series-type APF, a parallel-type APF and a direct-current-side capacitor. Aiming at the problem that a traditional detecting algorithm based on an instantaneous reactive power theory cannot accurately detect the distortion amount when network voltage is distorted, the invention further provides a methodfor using the unified power quality conditioner to detect the harmonic distortion amount and an improved comprehensive detection method of the synchronous rotation coordinate transformation deformation amount. Meanwhile, a novel digital lowpass filter is adopted by the method, a traditional lowpass filter is replaced through series connection of an improved moving averaging filter and a Butterworth filter, the calculating amount and the storage space are greatly reduced, the dynamic response speed is increased, and the detection of the network voltage and the load current distortion amount can be quickly and accurately conducted.

Description

technical field [0001] The invention belongs to the field of power electronics, and in particular relates to a unified power quality regulator and a method for detecting harmonic distortion. Background technique [0002] With the progress of the times, electric energy plays an increasingly important role in social production and people's daily life. With the continuous use of diversified loads, the power quality problems caused by nonlinear loads are increasing; at the same time, with the continuous emergence of new electronic equipment, people's requirements for power quality are constantly improving, and high-quality power has become the era demand. Therefore, a unified power quality conditioner (Unified Power Quality Conditioner, UPQC) capable of dealing with multiple power quality problems at the same time has received more and more attention and research. [0003] The distortion detection of UPQC includes grid voltage distortion detection and load current distortion d...

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Problems solved by technology

[0005] The present invention aims at the problem that the traditional p-q method and ip-iq method based on instantaneous reactive power theory have low detection accuracy when the voltage is distorted, and proposes a unified power quality regulator and its method for harmonic distortion detection. The traditional LPF low-pass filter is replaced by an improved new digital low-pass filter

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