Research on Three Phase Power Phase Locked Loop Technology

Abstract

When the distributed generation system is connected with the existing power grid, Loop Phase-Locked (PLL) is usually used to lock the power grid voltage phase and the inverter output voltage phase synchronization relationship, so as to control the inverter. Therefore, the performance of the phase locked loop will directly affect the control effect and stability of the grid connected converter, Even if the three-phase voltage in the grid is abrupt or unbalanced. The phase locked circuit is still required to track the grid voltage phase accurately and quickly. Software phase locked loop (Phase-Locked Loop Software, SPLL) can be used to achieve the program language.