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

Abstract

This article discusses the mathematical relationship between the grid-voltage-modulated-directpower-control (GVM-DPC) and the vector-current-control (VCC) for three-phase voltage-source-converters (VSCs). It reveals that the GVM-DPC is equivalent to the VCC at the steady-state, yet presents a superior transient performance by removing the need of phase-locked loop (PLL). That means the GVM-DPC solves the disadvantage of conventional DPC such as poor steady-state performance. Moreover, the GVM-DPC will reduce the computational burden in comparison with the VCC due to the absence of Park transformation and PLL. Consequently, we can expect that the GVM-DPC method has a good capability of plug-and-play for the VSC. Finally, the experiment results match the theoretical expectations closely. Index Terms Direct power control, vector current control, voltage source converters, phase-locked loop. I. INTRODUCTION OF CONTROL OF GRID-CONNECTED VOLTAGE-SOURCE CONVERTERS Voltage source converter (VSC) is widely used in the application of smart grid, flexible AC transmission systems, and renewable energy sources (e.g., wind and solar) [1]-[6]. Various control methods are researched for VSC to improve its performance, stability, and robustness [7].

Enhanced Low-Voltage Ride-Through Coordinated Control for PMSG Wind Turbines and Energy Storage Systems Considering Pitch and Inertia Response

“…The major advantage of a PMSG WT is its large operation range because it fully uses power converters, i.e., machine-side converters (MSCs) and grid-side converters (GSCs) [1]- [3]. Advanced power converter control methods are necessary for effectively utilizing this advantage [4]. These methods enable WPSs to generate the maximum WP [5] and control active and reactive power according to power grid conditions.…”

First‐order integral switching surface sliding‐mode control method of active front end rectifier for fast charger applications

“…Among the control strategies, SMC is a suitable solution to design control system for power converters due its inherent features, such as fast dynamic response, high accuracy, system‐order reduction, robustness and good performance in a wide range of operating conditions, and insensitivity to plant parameter variations [15]. The use of SMC strategy can guarantee the stability and robustness of the closed‐loop control system [16]. Many features make SMC highly appropriate for wide utilisation in industrial applications [17].…”

“…Among the proposed control methods implementation of SMC has emerged as a promising option for the control of power converters [18]. The common point of all the approaches is to make the system states reach the sliding surface in finite time [4, 16]. The SMC can be classified into two major categories: continuous switching (CS‐SMC) and discrete switching (DS‐SMC), as shown in Fig.…”

Sliding Mode Control With Grid Voltage Modulated DPC for Voltage Source Inverters Under Distorted Grid Voltage

“…In general, however, the DPC strategies are designed in stationary reference frame instead of the synchronous rotating reference frame for the simplification [23]- [28]. In addition, a novel DPC strategy called grid voltage modulated-DPC (GVM-DPC) has been designed for grid connected VSIs, where the poor steadystate performance of the DPC methods is solved [34]- [36]. However, the model of the GVM-DPC method is obtained based on a strong assumption, which needs a non-distorted grid voltage.…”