Power Information Integration Technology of DC-DC Converters Based on Orthogonal Frequency Division Multiplexing-Multiple Quadrature Amplitude Modulation
Guo Hao, Li Yan, Hou Bingbing, Jing Yongteng
College of Electrical Engineering Shenyang University of Technology Shenyang 110870 China
摘要 电力电子变换器通过功率与数据信息的复合调制,可使其在电能变换传输的同时进行数据信息的传输,从而实现能量信息一体化。该文以交错并联DC-DC变换器为研究对象,提出基于正交频分复用-多进制正交幅度调制（OFDM-MQAM）的能量信息一体化方法,并详细介绍变换器进行OFDM-MQAM的原理和具体实现方式,使能量信息一体化传输中的通信速率得到提升。建立变换器传输电能和信息的数学模型,在模型基础上计算分析输出电压纹波与数据信息传输的关系,并以此提出带有码元组合补零环节的OFDM-MQAM,大幅优化通信所引起的电压纹波。此外,针对多路载波引起的相位延时,通过所设计的解调环节避免OFDM系统的信道间和符号间干扰。最后通过一台交错并联的5 V/10 V Boost变换器完成了技术方法的实验验证。
Abstract：The power electronic converters can transmit data information while converting and transmitting power based on the power information multiplexed modulation, which makes the power information integration a reality. Optimizing the voltage ripple caused by communication while improving its communication rate can enhance the power information integrated capability more comprehensively. Therefore, this paper proposes a power information integrated method based on orthogonal frequency division multiplexing-multiple quadrature amplitude modulation (OFDM-MQAM), and uses an interleaved parallel DC-DC converter to analyze and implement it. Firstly, the output voltage ripple of the converter is analyzed based on the introduction of OFDM, MQAM, and power data dual-carrier modulation. The principle of the converter for OFDM-MQAM is clarified, and the mapping relationship between the data information and the specific harmonic components in the output voltage is established. Secondly, based on the implementation process of OFDM-MQAM in the existing communication field, the type of data carrier, the design of demodulation link, and other aspects are optimized by combining the actual control characteristics of the converter. The power information integrated method based on OFDM-MQAM is obtained, and the power data dual-carrier modulation process is described in detail. Thus, the purpose of multiple parallel transmissions of multi-decimal data information is achieved, and the communication rate is improved. Thirdly, the mechanism of voltage ripple caused by communication is clarified by modeling and analyzing the converter state variables before and after the data information switching time, and a solution is proposed. The core of the method is to make the output voltage value at the data information switching time similar or equal to the DC component of the output voltage. The peak value of the output voltage ripple is smaller when no-data carrier is involved than when the data carrier is involved in modulation. Thus, the no-data carrier modulation period can be added before and after the data information switching time to optimize the voltage ripple. The no-data carrier modulation period is called the symbol combination zero-padding period, and the OFDM-MQAM modulation method with the symbol combination zero-padding link is obtained to optimize the voltage ripple caused by the communication. Finally, a 5 V/10 V interleaved parallel Boost converter operating in continuous conduction mode (CCM) is used for verification. The results show that when the converter transmits data information at 25 kbit/s with reliable power conversion and transmission, the optimized voltage ripple peak value is reduced by 51.2%, which improves the power information integrated capability of the converter. In conclusion, the effect of MQAM can be achieved by the data modulation of the control signal. Combined with the data modulation of multiple carriers, the power information integration of OFDM-MQAM is realized so that the converter can handle parallel transmissions of multi-decimal data information to improve the communication rate. The mathematical model of the converter power information integrated transmission shows that switching the transmitted data information will cause a voltage ripple with large peak-to-peak values, which adversely affects the output voltage. To suppress the undesirable effect, the symbol combination zero-padding link is added to the power data modulation. By designing the demodulation link, the effect of inter-channel interference (ICI) and inter-symbol interference (ISI) can be eliminated. The technical approach proposed in this paper can be used as a reference to enhance the power information integration of power electronic converters.
郭昊, 李岩, 侯冰冰, 井永腾. 基于正交频分复用-多进制正交幅度调制的DC-DC变换器能量信息一体化技术[J]. 电工技术学报, 2023, 38(16): 4353-4365.
Guo Hao, Li Yan, Hou Bingbing, Jing Yongteng. Power Information Integration Technology of DC-DC Converters Based on Orthogonal Frequency Division Multiplexing-Multiple Quadrature Amplitude Modulation. Transactions of China Electrotechnical Society, 2023, 38(16): 4353-4365.
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