Low Frequency OFDM Based Power Line Communication Strategy for Multi-DC/DC Converter Power System

doi:10.11985/2023.01.006

Abstract

Abstract:

In DC power supply network, communication among DC/DC converters is the key to guarantee the improvement of power supply efficiency and reliability. Aiming at the complexity of traditional power line communication circuit, a multi-carrier power signal composite transmission method based on low-frequency orthogonal frequency division multiplexing technology is proposed. By superimposing parallel carrier signals on reference voltage, low frequency ripples are injected into output voltage and multi-carrier signal modulation can be then achieved using single power converter. For Buck converters connected in parallel, the principle of multi-carrier PWM/ASK signal modulation and demodulation based on OFDM technology is analyzed, and the system stability and signal transmission characteristics are discussed. Experiments are presented to verify good feasibilities of the proposed signal modulation method.

Key words: Orthogonal frequency division multiplexing, power line carrier communication, multi-carrier, signal modulation

CLC Number:

TM734

WEI Ziren, WANG Tailai, YU Kai. Low Frequency OFDM Based Power Line Communication Strategy for Multi-DC/DC Converter Power System[J]. Journal of Electrical Engineering, 2023, 18(1): 56-67.

Figures/Tables 20

References 26

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参数	数值
参数	1号变换器	2号变换器
输入电压V_in/V	12	8
电感L/μH	200	150
电容C/μF	100	100
开关频率f_s/kHz	100	100
参考电压V_ref/V	5	5
电压调节器比例系数k_pv	0.1~100	0.1~100
电压调节器积分系数k_iv	10~100	10~100
电流调节器比例系数k_pc	1~10	1~10
电流调节器积分系数k_ic	10~200	10~200
电压采样系数H_v	1	1
电流采样系数H_c	1	1
功率载波幅值V_m	1	1
负载电阻R/Ω	1

载波信号		所传基带信号
1 kHz(3 kHz)	2 kHz(4 kHz)	所传基带信号
0	0	00
0	1	01
1	0	10
1	1	11