Impact of static synchronous compensator on the stability of a wind farm: Case study of wind farm in Tunisia

Abstract

The static synchronous compensator is one of the FACTS (Flexible Alternating Current Transmission System) device capable of maintaining the stability of wind turbines during a sudden default. Among these faults, the voltage drops at the connection bus wind turbines. For this fault case, the static synchronous compensator intervenes by injection of the reactive power to compensate the voltage drop. In this article, as application case, we study the wind farm of Bizerte (north of Tunisia). This farm is composed of fixed speed aero-generators using squirrel cage induction generators. Our study begins with modeling the wind system. Next, we describe the technical requirements for connection of a wind energy system to the grid and outfit at the voltage dips (low-voltage ride through) according to STEG (Tunisian Company of Electricity and Gas). We also present the structure of static synchronous compensator. Finally, we present the simulation results of the wind farm under low-voltage ride through with and without static synchronous compensator.

Voltage stability enhancement for large scale squirrel cage induction generator based wind turbine using STATCOM

“…The results listed take into consideration not only the impact of STATCOM installation but also the location of installation in the wind turbine connected distribution system. Like the most surveyed similar works, authors in Karoui et al [14] cares about the stability improvement by only STATCOM installation process, a constrain of review for many similar studies show a lack of comparative analysis results to that figured in this study.…”

“…Moreover, [13] presents the impact of connecting SCIG-based wind farms to power system through a unified inter-phase power controller (UIPC), the power system stability, as well as the enhancement of the lowvoltage ride-through LVRT capability is presented. Karoui et al [14] starts by modeling a SCIG based wind farm while connected to a network, through simulation, the impact of connecting STATCOM on voltage dips mitigation is discussed. A fuzzy logic-based approach to enhance the steady state voltage stability for a grid connected wind farm including multi type wind generators, by reducing the deviation in the voltage of the load bus [15].…”

Analysis and Application of the Sliding Mode Control Approach in the Variable-Wind Speed Conversion System for the Utility of Grid Connection

“…With the intention of maintaining the enhanced transient response and minimizing the steady-state error, the switching surfaces can be in the integral forms [27]; alternatively, they can also be designed via back-stepping and nonlinear damping techniques:…”

“…In the event of a fault in the grid, the WECS must provide a reactive power proportional to the magnitude of the voltage drop. In addition, the magnitude of the grid current must not exceed the rated value in order to protect the semi-conductor constituting the grid side converter [27]. The relationship between grid voltage, the reactive power injected into the grid, and the active power reference is given by (24):…”

Research on fault causes and treatment methods of squirrel-cage asynchronous wind turbine

“…Among them, wind energy has abundant reserves and is a green energy source. Due to its advantages of the short construction period and low investment cost, the research and development of wind power generation have been deepened in recent years, and its application in China and around the world has become more and more extensive [3][4] , as shown in Figure 1. In 2021, China's newly added wind power installed capacity ranked first in the world, accounting for 50.9%, as shown in Figure 2.…”