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

A technology of power quality and regulator, applied in the direction of measuring electric variables, AC network to reduce harmonics/ripples, instruments, etc., can solve the problem of low detection accuracy, achieve response detection effect, ensure filtering accuracy, and improve detection accuracy The effect of dynamic response performance with

CN107741526AActive Publication Date: 2018-02-27JIANGSU UNIV
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
Publication Date
2018-02-27

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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.
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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...

Examples

Embodiment Construction

[0032] The technical solution of the present invention will be described in detail below in conjunction with the accompanying drawings.

[0033] like figure 1As shown, a unified power quality regulator includes a voltage and current detection module, an analog-to-digital conversion module, a DSP operation control module, a drive level conversion module, and a series APF (active power filter), a parallel APF and a DC side A main circuit composed of capacitors, a voltage and current detection module, an analog-to-digital conversion module, a DSP operation control module and a driving level conversion module are connected in sequence, and then connected to the main circuit. Among them, the voltage and current acquisition module is composed of Hall sensors, which is responsible for collecting the grid voltage and load current; the analog-to-digital conversion module uses TI’s ADC conversion chip ADS8364, which is responsible for converting the collected voltage and current into di...