Control of Grid-Connected Voltage-Source Converters: The Relationship Between Direct-Power Control and Vector-Current Control

This article discusses the mathematical relationship between grid voltage -modulated (GVM) direct -power control (DPC) and vector -current control (VCC) for three-phase voltage -source converters (VSCs). GVM-DPC is equivalent to VCC at the steady state, and it presents a superior transient performance by removing the need for the phase -locked loop (PLL). This means that GVMDPC solves the disadvantage of conventional DPC, such as poor steady-state performance. Moreover, GVM-DPC will reduce the computational burden in comparison with VCC due to the absence of Park transformation and PLL. Consequently, we can expect that the GVM-DPC method will be capable of plug -and -play for VSCs. Finally, the experimental results match the theoretical expectations closely