Wind In Integration and Transient stability Types of f Win ind - - PowerPoint PPT Presentation

Wind In Integration and Transient stability

Types of f Win ind Generators

Figure 1: Direct-in-line wind turbine system. [1]

Types of f Win ind Generators

Figure 2: Doubly fed induction generator wind turbine system. [2]

Modelling of f DFIG

Figure 3: Conventional induction machine equivalent circuit [3] Figure 4: Equivalent circuit of DFIG [3]

In Inducti tion Machine-Torque Slip lip Characteristic ics

• For low value Slip, Torque is directly

proportional to slip. STABLE REGION

• f OPERATION
• For high value of Slip, Torque is

inversely proportional to slip. UNSTABLE REGION of OPERATION

Controlling DFI FIG

Figure 6: Torque Slip characteristics of DFIG with Constant Vd and varying Vq [3] Figure 7: Torque Slip characteristics of DFIG with Constant Vq and varying Vd [3]

Controlling DFIG-Vector Control:

Figure 8: Stator Real Power, Slip characteristics of DFIG with Constant Vq and varying Vd [3] Figure 9: Stator Real Power, Slip characteristics of DFIG with Constant Vd and varying Vq [3]

Controlling DFIG-Vector Control:

Figure 9: Stator Reactive Power, Slip characteristics of DFIG with Constant Vq and varying Vd [3] Figure 10: Stator Reactive Power, Slip characteristics of DFIG with Constant Vd and varying Vq [3]

Controlling DFIG-Vector Control:

Figure 12: Rotor Real Power, Slip characteristics of DFIG with Constant Vq and varying Vd [3] Figure 11: Rotor Real Power, Slip characteristics of DFIG with Constant Vd and varying Vq [3]

Controlling DFIG-Vector Control:

Figure 12: Rotor Reactive Power, Slip characteristics of DFIG with varying Vd and Vq = 0.2 pu [3] Figure 13: Rotor Reactive Power, Slip characteristics of DFIG with varying Vd and Vq = 0.4 pu [3]

• Therefore, proper coordination between both Vq and Vd components of the DFIG injected rotor voltage results

in optimal operation of DFIG in terms of torque, real power and reactive power.

Effect of f ad addin ing wind with th an and with thout Transmis issio ion line on Transie ient St Stabili ility:

IEEE 14 bus system at bus 1 Figure 14: Comparing transient stability effects on rotor angle and Vbus1 with three phase fault [4]

Effects of f Addin ing Wind ind th through Different In Interconnectio ion Voltages

IEEE 14 bus system at bus 1 Figure 15: Comparing transient stability effects on rotor angle and Vbus1 with three phase fault [4]

Effects of f Addin ing Wind ind to Dif ifferent Bu Buses

IEEE 14 bus system Figure 16: Comparing transient stability effects on rotor angle and Vbus1 with three phase fault [4]

Effects of f Addin ing Wind ind Th Through Multip ltiple le Transmis issio ion Lin Lines

IEEE 14 bus system Figure 17: Comparing transient stability effects on rotor angle and Vbus1 with three phase fault [4]

Transient St Stabilit ity In Index:

• Transient Stability Index (TSI) is defined to estimate system transient stability.
• Analysis says that system is adversely affected when faults are near to areas with

high wind penetration.

• Small penetration of DFIG has positive impact on the system and high penetration

has negative impact on transient stability

• Fault Ride Through Capability
• where, δ max is the maximum angle separation of any two generators in the

system at the same time in the post-fault response. TSI>0 and TSI≤0 correspond to stable and unstable conditions respectively.

Role of f SVC and STATCOM

Figure 18: Static VAR Compensator Figure 19: STATCOM

Role of f SVC and STATCOM

Figure 20: Oscillations in Power output of Generator 1 (IEEE 14 bus system) [5] Figure 21: Bus 5 voltage variation (IEEE 14 bus system) [5]

Role of f STATCOM

Test Case 2: Figure 22: 10-machine test system [6]

Role of f STATCOM

Figure 23: Rotor angles in case without STATCOM [6] Figure 24: Rotor angles in case with STATCOM of 3 % of total generation capacity. [6]

Role of f STATCOM

Figure 24: Rotor angles in case with STATCOM of 6 % of total generation capacity. [6]

Role of f STATCOM

Table 1: Critical Clearing Time for Faults at different locations with Energy Storage as percentage of total generation [6]

Thank You