In the ever-evolving landscape of renewable energy, the stability and efficiency of grid-connected inverters are paramount. These inverters, crucial for integrating solar and wind energy into the power grid, rely on precise tracking of the grid’s voltage phase, frequency, and amplitude. Enter TANG Jianyu, a researcher who has developed an improved single phase-locked loop (SPLL) that could revolutionize the way we manage grid-connected inverters.
TANG’s improved SPLL addresses a significant challenge in the industry: the delay caused by low-pass filters or the construction of virtual quadrature signals in traditional SPLLs. This delay hampers the dynamic characteristics of the system, slowing down the acquisition of critical grid voltage information. “The improved algorithm of SPLL is simple, fast, and easy to implement,” TANG explains, highlighting the practicality of his solution.
The innovation lies in the use of trigonometric functions to obtain a quadrature signal with a 90° phase shift, mimicking the principle of a three-phase digital phase-locked loop (DPLL) based on the transformation from an αβ stationary reference to a dq synchronously rotating reference. This approach allows for the realization of a single-phase digital phase-locked control based on a fictitious two-phase rectangular coordinate system.
The implications for the energy sector are substantial. Accurate and rapid tracking of grid voltage parameters can enhance the stability and efficiency of grid-connected inverters, facilitating better integration of renewable energy sources. This, in turn, can contribute to a more resilient and sustainable energy infrastructure.
TANG’s research, published in *Kongzhi Yu Xinxi Jishu* (translated to *Control and Automation*), has been validated through Matlab simulations and experimental analysis. The results demonstrate that the improved SPLL can accurately track voltage frequency, phase, and amplitude changes in the power grid, achieving stability quickly.
As the world increasingly turns to renewable energy, innovations like TANG’s improved SPLL become ever more critical. By enabling more precise and efficient grid-connected inverter operations, this research could shape the future of energy management, paving the way for a more stable and sustainable energy landscape. The simplicity and effectiveness of TANG’s solution make it a promising development in the field, one that could have far-reaching commercial impacts for the energy sector.