In a photovoltaic system, a dc_dc power optimizer (DCPO) is an option to maximize the output power. At the same time, data links among DCPOs are often required for system monitoring and controlling. This paper proposes a novel power line communication method for the DCPOs, in which the data of a DCPO are modulated into the control loop of a power converter, and then transmitted through the series-connected dc power line to other DCPOs. In the process of communication, differential phase-shift keying modulation and discrete Fourier transformation demodulation are employed. To analyze the quality of communication, the communication model of the system is built, based on a small-signal model. Furthermore, the noises of the system, including switching, maximum power point tracking, and additive white Gaussian noise, are discussed and measured to evaluate the signal-to-noise ratio. Lastly, an experimental system including six DCPOs is established and tested, which verifies the feasibility and effectiveness of the proposed method.

中文翻译：

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通过在功率控制环路中调制数据将电力线通信嵌入到光伏优化器中


在光伏系统中，dc_dc 功率优化器 (DCPO) 是最大化输出功率的一个选项。同时，DCPO之间的数据链路通常需要用于系统监视和控制。本文提出了一种新颖的DCPO电力线通信方法，其中DCPO的数据被调制到功率转换器的控制环路中，然后通过串联的直流电力线传输到其他DCPO。通信过程中采用差分相移键控调制和离散傅立叶变换解调。为了分析通信质量，基于小信号模型建立了系统的通信模型。此外，还讨论并测量了系统的噪声，包括开关、最大功率点跟踪和加性高斯白噪声，以评估信噪比。最后，建立并测试了包含6个DCPO的实验系统，验证了所提方法的可行性和有效性。