Abstract
Through the feedback of the rotor speed and/or the grid frequency, an energy storage system (ESS) can effectively suppress the electromechanical oscillation of a power system. This paper proposes a novel control strategy and controller parameter design method for ESSs to achieve the desired performance of oscillation suppression, including smaller frequency and rate of change of frequency (ROCOF) deviation than their threshold values. Firstly, a dynamic model of the electromechanical time scale of a synchronous generator dominated power system with ESS was established. Then, based on the dynamic model and the electric torque analysis method, the mechanism of an ESS with the feedback signal of the rotor speed to suppress the electromechanical oscillation was investigated. Finally, the controller parameter design method for the ESS was developed to achieve the desired performance of oscillation suppression. With the help of the well-designed ESS, the electromechanical oscillation of a synchronous generator dominated power system can be effectively suppressed in shorter transient response times, and the grid frequency deviation and the ROCOF can be limited to below their threshold values. The simulation results also verify the effectiveness of the proposed control strategy and the controller parameter design method.
Highlights
With the continuous expansion of power systems, the structure of the power system is becoming more and more complex, and technological disturbances are gradually increasing with the growth of renewable energy
According to (17), when ∆ω > 0, the P controller parameter Kp should satisfy: Kp ≤ −. In this period, the energy storage system (ESS) can provide a certain amount of negative damping torque to the power system, so that the response curve of the grid frequency presents a divergent state in this period, prompting the transient frequency to return to the steady-state point ω0 as soon as possible, that is to rush from T3 to T4 at the fastest possible speed
When conventional with fixed controller parameters is used throughout theoscillation
Summary
With the continuous expansion of power systems, the structure of the power system is becoming more and more complex, and technological disturbances are gradually increasing with the growth of renewable energy. By real-time optimization of the ESS controller’s parameters, online regulation of the equivalent inertia and damping of the power system is realized, and the dynamic performance of oscillation suppression is improved, ensuring that the grid oscillation is restrained at the fastest speed under the premise of satisfying the constraints of smaller frequency and rate of change of frequency (ROCOF) deviation below their threshold values.
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