多DC/DC变换器互联直流系统低频OFDM电力线通信策略

doi:10.11985/2023.01.006

摘要/Abstract

摘要：

在直流供电网络中，设备之间的有效通信是保障系统供电可靠性和安全性的重要基础。针对传统电力线通信电路的复杂性，提出一种基于低频正交频分复用技术的多载波功率信号复合传输方法，通过在参考电压叠加并行载波信号，将调制信号加载在输出电压低频纹波中进行传输，利用单个变换器实现了多个载波信号的调制。针对输出端并联的Buck电路系统，分析了基于正交频分复用技术的多载波PWM/ASK的信号调制解调的原理，并对系统的稳定性和信号传递特性进行分析，并通过仿真和试验验证了该信号调制方法的可行性。

关键词: 正交频分复用, 电力线通信, 多载波, 信号调制

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

中图分类号:

TM734

卫紫任, 王泰来, 于凯. 多DC/DC变换器互联直流系统低频OFDM电力线通信策略[J]. 电气工程学报, 2023, 18(1): 56-67.

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.

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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