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Abstract
In recent years, with the widespread use of non-linear loads power electronic devices associated with the penetration of various renewable energy sources, the distribution system is highly affected by harmonic distortion caused by these sources. Moreover, the inverter-based distributed generation units (DGs) (e.g., photovoltaic (PV) and wind turbine) that are integrated into the distribution systems, are considered as significant harmonic sources of severe harmful effects on the system power quality. To solve these issues, this paper proposes a harmonic mitigation method for improving the power quality problems in distribution systems. Specifically, the proposed optimal planning of the single tuned harmonic filters (STFs) in the presence of inverter-based DGs is developed by the recent Water Cycle Algorithm (WCA). The objectives of this planning problem aim to minimize the total harmonic distortion (THD), power loss, filter investment cost, and improvement of voltage profile considering different constraints to meet the IEEE 519 standard. Further, the impact of the inverter-based DGs on the system harmonics is studied. Two cases are considered to find the effect of the DGs harmonic spectrum on the system distortion and filter planning. The proposed method is tested on the IEEE 69-bus distribution system. The effectiveness of the proposed planning model is demonstrated where significant reductions in the harmonic distortion are accomplished.
Highlights
Nowadays, distribution system power quality is one of the most important challenges, especially after the widespread use of harmonic sources in distribution systems which is considered as one of the most effective factors on power quality [1]
The results show that the proposed method reduced effectively the maximum total harmonic distortion (THD) from 7.87% to 2%
The proposed method considers the harmonic content resulted from the inverter-based distributed generation units (DGs) units in the distribution system
Summary
Distribution system power quality is one of the most important challenges, especially after the widespread use of harmonic sources in distribution systems which is considered as one of the most effective factors on power quality [1]. Various methods were developed for the optimal design of passive harmonic filter based on optimization techniques such as particle swarm optimization [20], simulated annealing [21], and fuzzy linear programming [22] Such optimization techniques are considered for solving this nonlinear problem which has a very large search space. Authors in [23] presented a method for single-tuned filter placement in a small distribution system based on a genetic algorithm to reduce the harmonic distortion. In [27], simultaneously planning of both inverter-based DGs and passive filters in the distorted distribution system are considered for minimizing THD and power loss. A proposed method is introduced for simultaneously determine the optimal design, number, and placement of single tuned harmonic filters by using the Water Cycle Algorithm (WCA) which is implemented as a multi-objective optimization algorithm. The organization of the current paper is ordered as follow: Section 2 presents the problem formulation, Section 3 presents the optimization algorithm and electric scheme representation, Section 4 presents, the proposed filters planning procedure, Section 5 presents the application of the proposed method, Section 6 presents simulation results and discussion, and Section 7 presents the conclusions
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