Abstract
Because of low losses and voltage drop, fast control of power, limitless connection distance, and isolation issues, using high-voltage direct-current (HVDC) transmission system is recommended to transfer power in the power systems, including wind farms. This paper aims to propose a supplementary damping controller (SDC) based on the HVDC to improve not only power system dynamic stability but also energy conversion efficiency and torsional vibration damping in the wind power plants (WPPs). When the WPPs are working in power control mode, the active power is set to its reference value, which is extracted from power-speed curve. This paper shows that torsional oscillations associated with the poorly torsional modes can be affected by different operating regions of the power-speed curve of WPP. Therefore, it is essential to employ an SDC to have the optimum energy conversion efficiency in the wind turbine and the most dynamic stability margin in the power system. The SDC is designed using a fractional-order PID controller (FOPID) based on the multiobjective bat-genetic algorithm (MOBGA). The simulation results show that the proposed control strategy effectively works in minimizing the torsional and electromechanical oscillations in power system and optimizing the energy conversion efficiency in the wind turbine.
Highlights
Nowadays, due to the increased energy demand and environmental considerations, there is a growing need for using renewable energy sources, such as wind energy, in power systems [1,2,3,4,5]
In [29], to enhance the robustness of stabilizing controllers against system uncertainties, a new coordinated robust control of doubly fed induction generator (DFIG) wind turbine equipped with power oscillation damper (POD) and synchronous generator installed with power system stabilizer (PSS) for stabilization of power system oscillations is proposed
The effect of proposed supplementary damping controller (SDC) on the torsional oscillations of the hybrid power system based on VSC high-voltage direct-current (HVDC) transmission system is examined by time domain simulations
Summary
Due to the increased energy demand and environmental considerations, there is a growing need for using renewable energy sources, such as wind energy, in power systems [1,2,3,4,5]. Is technology has the advantage of fast response, the possibility of providing reactive power to AC systems, and the use of supplementary control signals to their automatic voltage regulators to improve dynamic and transient (voltage-frequency) stability, damp local and interarea oscillations, and mitigate subsynchronous shaft torsional oscillation in power systems, including WPPs [22,23,24,25]. It is shown that the control inputs of the HVDC system are effective on the oscillation modes of the power system equipped with WPP, and to strengthen the dynamic stability margin, the use of a damping controller in the HVDC transmission system is suggested. In the present work, using a FOPID based on EMA is utilized to design SDC controller
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