Abstract
In recent years, the installation of distributed generation (DG) of renewable energies has grown rapidly. When the penetration of grid-integrated DGs are getting high, the voltage and frequency of the power system may cause deviation. We propose an algorithm that reduces voltage and frequency deviation by coordinating the control of multiple battery energy storage systems (BESSs). The proposed algorithm reduces the total number of charging and discharging times by calculating the sensitivity coefficient of BESS at different nodes and then selecting the appropriate BESSs to operate. The algorithm is validated on a typical distribution testing system. The results show that the voltage and frequency are controlled within the permissible range, the state of charge of BESSs are controlled within the normal range, and the total number of charging and discharging cycles of BESSs are reduced.
Highlights
In order to fulfil the growing demand for energy, there has been a rapid expansion of renewable energies such as wind power and solar power in recent years [1]
We propose a novel control algorithm for coordinated control of battery energy storage systems (BESSs), which enable power systems to deal with emergencies and combines voltage regulation and frequency regulation in one process by using the operating reserve
Through the coordinated charging and discharging of multiple BESSs, the grid voltage and frequency are controlled within the permissible range, and the adverse effects caused by deviation are alleviated
Summary
In order to fulfil the growing demand for energy, there has been a rapid expansion of renewable energies such as wind power and solar power in recent years [1]. In order to solve the shortcomings of traditional regulation methods, researchers have proposed many solutions using battery energy storage systems (BESSs) to adjust voltage and frequency recently. We propose a novel control algorithm for coordinated control of BESSs, which enable power systems to deal with emergencies and combines voltage regulation and frequency regulation in one process by using the operating reserve. Through the coordinated charging and discharging of multiple BESSs, the grid voltage and frequency are controlled within the permissible range, and the adverse effects caused by deviation are alleviated. The proposed coordinated control algorithm firstly calculates the required power for voltage and frequency deviation control, respectively, and compares the two values and obtains an optimal regulating power for simultaneously solving the voltage and frequency deviation, which reduces the number of BESSs charging and discharging cycles, and improves the life time of the batteries.
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