A Combined Approach of Using an SDBR and a STATCOM to Enhance the Stability of a Wind Farm

Abstract

This paper presents a method to enhance the stability of grid connected wind farm composed of fixed speed wind turbine generator system (WTGS) using a combination of small size series dynamic breaking resistor (SDBR) and static synchronous compensator (STATCOM). SDBR and STATCOM have the active and reactive power control abilities, respectively, and a combination of these units pave the way to stabilize well the fixed speed wind farm. In this study, centralized control scheme of using SDBR and STATCOM in together is focused, which can be easily integrated with wind farm. Different types of symmetrical and unsymmetrical faults are considered to evaluate the transient performance of the proposed control scheme, applicable to grid connected wind farm. The effect of multi-mass drive train of fixed speed WTGS in fault analysis along with its importance in determining the size of SDBR to augment the transient stability of wind farm is investigated. Extensive simulation analyses are performed to determine the approximate sizes of both SDBR and STATCOM units. Dynamic analysis is performed using real wind speed data. A salient feature of this work is that the effectiveness of the proposed system to minimize the blade-shaft torsional oscillation of fixed speed WTGS is also analyzed. Simulation results show that a combination of small size SDBR and STATCOM is an effective means to stabilize the wind farm composed of fixed speed WTGS.

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

“…A centralized control scheme of using a small SDBR and a STATCOM is introduced in Ref. [94] as shown in Fig. 19.…”

“…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.…”

Research on Double-Fed Induction Generator Low Voltage Ride Through Based on Double Braking Resistors Using Fuzzy Control

“…A DFIG with a crowbar circuit is a very common solution for LVRT [14,15], but this solution is confined to the rotor side, such as limiting DC capacitor voltage and rotor current. A STATCOM can improve the LVRT performance of a wind farm [16], and it is often used in collaboration with crowbar circuits. The SDBR in [17] could improve the LVRT capacity of a DFIG, and the bypass switching control mode uses the method introduced in [18].…”

Hybrid HTS-FCL Configuration With Adaptive Voltage Compensation Capability

“…Series-braking resistors are very useful for stability enhancement, and unlike parallel-braking resistors, they can be used to act during fault to provide energy balance and enhance the machine's critical clearing time [16]- [18]. In this type, a resistor is put in parallel with a conventional mechanical switch that can be controlled by a fault-triggering scheme, but it has very slow response time.…”

“…In this type, a resistor is put in parallel with a conventional mechanical switch that can be controlled by a fault-triggering scheme, but it has very slow response time. Further research shows that the seriesbraking resistor's performance can be significantly enhanced by the use of solid-state switches such as insulated-gate bipolar transistors [18].…”