Low Voltage Ride through Characteristics Analysis of Direct-Driven Wind Power System

Abstract

This paper introduced the control strategy of back-toback full-scale PWM converter in direct-driven wind power system with PMSG (Permanent Magnetic Synchronous Generator). A simulation model has been built to demonstrate the maximum wind energy capture, DC voltage stability and decouping control of active and reactive power. In addition, the dynamic responses of system parameters during typical voltage sag and the role of dumping load at DC side have been tested. The simulation result shows that direct-driven wind power system has good capability of low voltage ride through.

A review of low-voltage ride-through enhancement methods for permanent magnet synchronous generator based wind turbines

“…In some papers, a Braking Chopper (BC) or active crowbar system is proposed to be placed in dc-link to dissipate the active power during the grid faults [60,[66][67][68][69]. Braking chopper consists of a high power resistor with a series switch as shown in Fig.…”

“…The two foremost types of LVRT capability enhancement methods are external devices based methods and modified controller based methods. Energy Storage Systems (ESSs) , Braking Chopper (BC) or active crowbar system [66][67][68][69][70], FACTS devices [71][72][73][74][75][76][77][78][79][80][81][82][83][84][85][86][87][88][89][90] and some other methods such as Series Dynamic Breaking Resistor (SDBR), electronic on Load Tap Changer (OLTC) [91][92][93][94][95] are popular methods for LVRT capability enhancement using external devices. Pitch Angle Control (PAC) [96][97][98][99] and modified back-to-back converter controllers [100][101][102][103][104][105][106][107][108] are modified controller based methods.…”