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| Real-Time Bidirectional Energy Information Collaborative Transmission Method Based on Dual DC-DC Converters |
| Li Guohua1, Zhang Wenxing1, Wu Zehua2 |
1. Faculty of Electrical and Control Engineering Liaoning Technical University Huludao 125105 China;
2. Jinzhou Branch Northeast Electric Power Co. Ltd State Power Investment Corporation Jinzhou 121000 China |
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Abstract As a key equipment, such as distributed power generation, active distribution network, power energy conversion, etc., the information interaction ability of power electronic converters determines the level of information intelligence of the system as a whole. Power electronic converters can simultaneously transmit information during energy conversion and transmission, that is, superimpose the data to be transmitted on the converter's power control loop. An innovative energy information collaborative transmission method leverages the electrical characteristics of the power converter to achieve deep integration of energy and information flows, overcoming the limitations of the single-function capabilities of traditional power electronic devices. To address the universal unidirectional communication constraint between dual converters and the demand for real-time bidirectional data interaction in application scenarios such as electric vehicle cluster charging, a real-time bidirectional energy-information collaborative transmission method based on dual DC-DC converters is proposed.
First, the coupling relationship between the PWM drive signal and the carrier frequency that controls the switching device of the power electronic converter is introduced, and the composite modulation strategy is explained. The binary data to be transmitted is superimposed on the PWM drive signal by modulating the carrier frequency, so that the converter ripple contains a frequency component that encodes the data.
Secondly, a dual-DC-DC converter real-time bidirectional energy-information collaborative transmission system is constructed, and a dual-channel architecture for voltage, current, and ripple is introduced to enable bidirectional data transmission via real-time synchronous control at the microsecond level. At the same time, the factors affecting the converter's voltage and current ripple characteristics are analyzed in detail.
Subsequently, to address the dynamic coding problem of ripple frequency, modulation and demodulation techniques in modern digital communication are integrated into the converter control strategy. On the one hand, the power/data single-carrier and power/data dual-carrier information modulation methods are introduced, which primarily embed the transmitted digital information in the converter's gate PWM control signal via 2FSK modulation. This information-modulation method enables the power-conversion process to perform dual functions: power transmission and information transmission. On the other hand, a demodulation method based on ripple peak detection (RPD) is proposed, which decodes data using the collected ripple peak value.
Finally, by constructing an experimental dual DC-DC converter platform, real-time bidirectional transmission of both identical and different information is demonstrated. By flexibly configuring the data content type, not only is the adaptability of the communication architecture enhanced, but also a multi-dimensional information interaction solution is provided for more complex power electronic systems. The results show that the proposed method achieves a real-time bidirectional transmission rate of 10 kbit/s, with a delay between the transmitted and demodulated information of 40 μs.
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Received: 16 April 2025
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2026, Vol. 41 
