Sideband Harmonic-Based Talkative Power Conversion
Zewen Wang, Dehong Zhou, Xin Liu, Zewei Shen, Jianxiao Zou
Abstract
Talkative power conversion (TPC) is a promising solution to modern power system communication due to its advanced features of reduced communication infrastructure and low volume. However, the majority of TPC in three-phase inverters is realized by superimposing the frequency-hopping sinusoidal reference signals, which adversely affects the power quality and stability from the perspective of the power system. In view of this, this article proposed a sideband harmonic-based TPC scheme for three-phase inverters without extra harmonics injection. In the proposed scheme, the signal is modulated into the carrier-based pulsewidth modulation by binary phase-shift keying modulation and is transmitted over power lines via sideband harmonics. Sideband harmonics with different carrier phases are analyzed by double Fourier series (DFS) and modeled under <italic xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">dq</i> frame for efficient demodulation. The proposed strategy takes advantage of the existing sideband harmonics to achieve TPC in three-phase inverters, which avoids introducing extra harmonics and has less impact on the power quality. As a result, the given solution not only reduces system costs and volume but also realizes a power quality-friendly signal transmission. Finally, the feasibility of the proposed TPC method is verified by the experimental platform.