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ABSTRACT
High penetration level of wind power has significant impact on the dynamic performance of power system. Power system with existing high-voltage direct current (HVDC) link may influence the stability of power system at high penetration level of wind power. This article investigates the stability issues of power system with existing HVDC link for different penetration level of doubly fed induction generator (DFIG) and direct drive synchronous generator (DDSG) based wind farms. The small signal stability analysis shows that power system with HVDC link has improved the stability of the power system for increased penetration of DFIG- and DDSG-based wind farms.
Nomenclature
| A, B, C, D | = | State, control, output and feed forward matrices of the linearized model of a power system |
| = | Power coefficient | |
| = | Rotor inertia | |
| = | Current flowing in DC line of HVDC link | |
| = | d and q-axis rotor currents | |
| = | d and q-axis stator currents | |
| = | DC current rating of HVDC link | |
| = | Inductance of DC connection of HVDC link | |
| = | Total system load | |
| = | Total wind generated capacity | |
| r | = | Radius of the turbine ( |
| Rdc | = | Resistance of DC connection of HVDC link |
| = | Stator and rotor resistances | |
| = | Inverter power of HVDC link | |
| Sn | = | Rated apparent power of HVDC link |
| = | Rectifier power of HVDC link | |
| = | Electrical torque | |
| = | Mechanical torque | |
| v | = | Wind speed (m/s |
| V | = | Grid voltage |
| = | d and q-axis stator voltages | |
| = | Inverter voltage of HVDC link | |
| = | DC voltage rating of HVDC link | |
| = | Rectifier voltage of HVDC link | |
| = | d-axis reactance | |
| = | Magnetizing reactance | |
| = | q-axis reactance | |
| = | Stator and rotor reactance | |
| = | Input vector of the linearized model of a power system | |
| = | State vector of the linearized model of a power system | |
| = | Speed ratio | |
| Θ | = | Phase angle |
| ρ | = | Air density ( |
| = | Permanent field flux used to represent the rotor circuit | |
| = | Rotor speed |