Reliability assessment for DFIG ‐based WECS considering the impact of 3‐phase fault and lightning impulse voltage

Abstract

Summary The assimilation of wind energy into the conventional grid brings several considerable challenges when uncertainties are considered. The uncertainties, including the occurrence of three‐phase fault and lightning fault, are considered to analyze the reliability and performance of the wind energy system. So, a study is a prerequisite for the power system, including wind farm (WF), voltage source converter (VSC), and lightning voltage and current phenomena. Therefore, the present work deals with the generation of lightning envelopes of impulse voltage and current and rectangular pulse current by considering the realistic equivalent circuit. The generated impulse voltage acting as a lightning fault is then implemented on the 3‐phase terminals of grid‐connected Doubly Fed Induction Generator (DFIG) based Wind Integrated Power System (WIPS), which includes six wind turbines (WT) of 1.5 MW each and 120 kV, 60 Hz grid. A 3‐phase short circuit fault is applied further to compare the output responses of the DFIG‐based WIPS. The system's behavior under both faults is observed by determining the controller gain values. The gains, including proportional (kp) and integral (ki) of a sixth‐order transfer function for Wind Turbine Generator (WTG), have been determined by using particle swarm optimization (PSO) algorithm. A reliability assessment of VSC considering DC voltage is done using the Monte‐Carlo (MC) method, considering the lightning impulse voltage (LIV) as a major cause of converter failure. It is found that the DFIG‐based WIPS achieves considerable responses under both types of faults by obtaining the optimal controller values. It has been also observed that the reduction in the number of failures that occurred in VSC during the lightning strike improves the system's reliability.

Reliability, availability, and condition monitoring of inverters of grid‐connected solar photovoltaic systems

“…If there are n independent components of a system and are connected in cascade as shown in Figure 3 and if all the components are under working conditions for the successful operation of the system then, according to the simple probability principal, the overall reliability of the system is given by Equation (13).…”

“…For adequate functioning of the grid-connected PV system, the availability and dependability are important parameters as discussed in [12][13][14]. In literature, the most commonly used techniques for reliability analysis including availability and dependability of large systems involve RBD and Fault Tree Analysis (FTA) [15].…”

Control Strategies and Performance Analysis of Doubly Fed Induction Generator for Wind Energy Conversion System

“…The module capacitor can be connected or bypassed regardless of the direction of current. Whether the capacitor charges or discharges depend on the direction of current flow [14]. This results in the multilevel output voltage.…”

Sub‐synchronous interaction damping controller for a series‐compensated DFIG‐based wind farm

“…In this study, the IEEE first benchmark model is adapted with a DFIG-based wind farm for SSI studies [9,10,30], as depicted in Figure 1.The study system includes a 100 MW DFIG-based wind farm connected to the infinite bus via one step-up transformer and a series-compensated transmission line. The 100 MW wind farm is an aggregated model of 67 wind turbine units, where the power rating of each wind turbine is 1.5 MW.…”

“…In [29], the inner control loops of RSC were replaced with an enhanced compensation filter based on the motion-induction amplification (MIA) concept to increase the damping of SSI. In [30], reliability assessment for DFIG-based wind energy conversion system (WECS) considering the impact of three-phase fault and lightning impulse voltage. In [31], a comprehensive review on layout optimization algorithms and reliability assessment of wind farm for microgrid integration.…”