Stability Analysis of Voltage Source Converter Control Based HVDC System

Abstract

These days, the use of power electronics equipment to transfer high voltages has a major effect on power grid stability. This research looks at how dynamic stability may be enhanced by the control of voltage source converter-based high-voltage-direct-current systems (VSC-HVDC). To regulate active and reactive power separately, the system voltages and currents are given in the synchronous reference frame (dq-frame). This paper focuses on a backstepping control technique based on the Lyapunov theory of a three-phase PWM VSC station under fault and grid constraints to ensure the proposed system's dynamic stability. Therefore, stable DC-link voltage, stable point-of-common-coupling (PCC) voltages, and sinusoidal AC side currents can be accurately realized. In addition, stability under fault and grid constraints can also be guaranteed. Through numerical simulations and comparisons with conventional proportional-integral control (PIC), the effectiveness and steady-state stability of the PWM VSC station-based HVDC using the proposed backstepping control technique have been established.