Implementation of single-phase grid synchronization module with low-end microcontrollers

Abstract

Global energy market reveal the necessity of the use of renewable energy sources which requires an interface converter if their energy has to be passed into the grid. The operation of the interface converters depends on the operation of their synchronisation unit. Low power sources need simpler and cheaper control systems. This paper shows an example of simple implementation of the grid synchronization module based on an MSP430 microcontroller. This example follows from a complete PLL system, finally giving simplified, operating system. The obtained preliminary results confirm the operation of the propose synchronizer, but show the necessity of its further improvement.

Evaluation of Quadrature Signal Generation Methods with Reduced Computational Resources for Grid Synchronization of Single-Phase Power Converters through Phase-Locked Loops

“…The PLL with generation of the quadrature signal based on a derivative block (D PLL) [54] has been widely used in the continuous domain [55]. Its digital implementation (Figure 6) produces a very precise result [56], although it requires a numerical approximation to the derived function, following one of the methods shown in Table 2, to reduce the effect of noise. In order to reduce the noise that amplifies the calculation of the derived function, it is necessary to increase the number of samples, which, in addition, introduces a phase shift in the quadrature component.…”