Analysis of Voltage Control Strategies for DC Microgrid with Multiple Types of Energy Storage Systems

Abstract

Direct-current (DC) microgrids have gained worldwide attention in recent decades due to their high system efficiency and simple control. In a self-sufficient energy system, voltage control is an important key to dealing with upcoming challenges of renewable energy integration into DC microgrids, and thus energy storage systems (ESSs) are often employed to suppress the power fluctuation and ensure the voltage stability. In this paper, the performances of three voltage control strategies for DC microgrids are compared, including the proportion integration (PI) control, the fuzzy PI control and particle swarm optimization (PSO) PI control. Particularly, two kinds of ESSs including battery and advanced adiabatic compressed air energy storage (AA-CAES) with different operational characteristics are installed in the microgrid, and their impacts on voltage control are investigated. The control performances are comprehensively compared under different control schemes, various scenarios of renewable energy fluctuations, participation in the control of the two ESSs or not, and different fault conditions. Additionally, the dynamic performances of the ESSs are exhibited. The results verify the validity of the control schemes and the feasibility of the configuration of the ESSs into the DC microgrid.

Enhancing Microgrid Stability and Energy Management: Techniques, Challenges, and Future Directions

“…In some cases, to overcome the stability issues and load balance anomalies on the distribution side, a virtual operator module that simulates actions and mitigation measures of grid operators is used. For example, an OSER simulator is used to investigate the planning aspects of power systems such as transmission and distribution, management of interconnections, voltage, reactive power, generation, and load balances are taken into account for this planning tool [149][150][151][152]. The implementation of those techniques restores load but increases stress in the power network due to increased reactive power consumption.…”

“…Error regarding nominal values is calculated and the controller is designed to minimize the voltage error. The control schemes for voltage stability in the power systems are divided based on the implementation structure where centralized control is used for stability (voltage, frequency, power) [17,150,167]. Integration of DGRs/RESs in the power systems and the formation of MG have encouraged control and power engineers to develop new control techniques for MG operation challenges.…”

An Intelligent Risk Forewarning Method for Operation of Power System Considering Multi-Region Extreme Weather Correlation

“…With the continuous expansion of the power system scale and increasing demand for load, risk management in system operation has become crucial [35][36][37]. In order to accurately assess the operational risks of the system and classify corresponding risk levels, this paper selects the voltage limit exceedance index, line overload index, power transfer capability index, and loss of load probability index as comprehensive assessment criteria.…”

Design of a Switching Strategy for Output Voltage Tracking Control in a DC-DC Buck Power Converter

“…This type of circuit is mainly used to improve efficiency in applications where voltage control is realized accurately, avoiding unwanted effects that occur with pulse width modulation (PWM) controllers. PWM control generates an undesirable dynamic effect on its output, generally as a result of a noisy output signal, as well as current spikes, elements that are not favorable for either the power supply or the circuit load such as another circuit or an application [2][3][4][5][6][7][8]. In the particular case of the Buck-type converter, there are two elements that can store energy, a coil and a capacitor, which reduces the amplitude of the effects generated by the commutation of the switches of the circuit, on the output signal [2].…”