Assessment of voltage detection-based Selective Harmonic Current Compensation Strategies for Different Non-linear Load Signatures

Abstract

This paper compares the performance of voltage detection-based selective harmonic current compensation (VDB-HCC) strategies to improve grid power quality under different non-linear load (NLL) signatures. The harmonic current compensation content of current-source and voltage-source NLLs are investigated through three VDB-HCC strategies: VDB-HCC based on a single current loop (SCL); VDB-HCC based on dual parallel current control loops (DCL); and VDB-HCC based on parallel voltage and current control loops (VCL). Analytical models and frequency response analysis are derived to corroborate the findings of this paper. Simulation results show that the VCL strategy performs better harmonic compensation compared to the SCL and DCL strategies, under penetration of both current-source and voltage-source NLLs and weak grid conditions. Experimental results using a 1.5-kW commercial distributed energy resource (DER) are also conducted. The outcomes of this paper support the decision-making of industrial consumers and distribution system operators to pursue harmonic distortion levels within acceptable limits.

Keywords

• harmonic current compensation
• non-linear load signatures
• low selective output impedance
• voltage detection-based strategy
• voltage distortion