Abstract
Norton equivalent circuit is a commonly used model in estimating harmonic current emissions of harmonic sources. It however cannot reflect the mutual coupling relationships among voltage and current in different harmonic orders. This paper proposes a new method to identify parameters in a coupled harmonic admittance model. The proposed method is conducted using voltage and current measurements and is based on least square estimation technique. The effectiveness of the method is verified through time-domain simulations for a grid-connected converter and also through field data obtained from a ±800 kV converter station. The experimental results showed that the proposed method presents higher accuracy in terms of harmonic current emission estimation compared with three Norton-base methods.
Highlights
In recent years, with the increasing penetration of distributed energy and nonlinear loads, harmonics have attracted much attention of both grid operators and power users
Modeling of harmonic sources is essential in estimating the harmonic current contribution as a function of the background harmonic voltage
This paper proposed an identification method of the coupled harmonic admittance based on least square estimation using measurement data
Summary
With the increasing penetration of distributed energy and nonlinear loads, harmonics have attracted much attention of both grid operators and power users. Modeling of harmonic sources is essential in estimating the harmonic current contribution as a function of the background harmonic voltage. Authors in Reference [1] summarized the progress in harmonic analysis in both time and frequency domains. Authors in References [8,9] built Norton’s equivalent circuit for iron and steel plants and estimated their harmonic current contributions to the background grid. In Reference [10], the authors considered the open-loop inverter of a double-stage PV system as a Norton equivalent. Paper [11] estimated the shares and locations of harmonic sources in radial distribution systems using the Norton model as representation of the customer side. A discrete time-domain closed-loop Norton’s equivalent circuit is developed in Reference [12] for a micro-grid. Paper [13] analyzed Inverse Nyquist Stability Criterion for a grid-tied inverter system based on a Norton equivalent circuit of the inverter
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