Abstract
Distributed energy storage technology is used to stabilize the frequency and voltage of the microgrid operating in islanded mode. However, due to the inconsistent state of charge (SoC) of the energy storage unit (ESU), the active power output of the ESU cannot be shared reasonably. On the basis of stabilizing voltage and frequency, this paper presents a power exponential function droop control (PEFDC) strategy considering the SoC. In this control strategy, the ESU is allowed to adjust the output power adaptively according to its own SoC level during discharge and reaches SoC equilibrium. Simulation models are built to compare the PEFDC strategy with conventional droop control (CDC) and power function droop control (PFDC) approaches. The simulation results illustrate the superiority of the proposed control strategy over the other two methods. Finally, the hardware-in-the-loop experiment is conducted to verify the effectiveness of the PEFDC strategy.
Highlights
The development and use of new energy sources have become trends for the present and the future, as the serious pollution caused by traditional energy sources has brought environmental problems to the fore
Stabilizing the frequency of the AC microgrid is the basic task of various control strategies, and each energy storage unit (ESU) can be cut off or put in depending on the scale of the load, which improves the stability of the microgrid [6,7]
In Ref. [21], a power function droop control based on state of charge (SoC) is proposed, but the method is applied to DC microgrids
Summary
The development and use of new energy sources have become trends for the present and the future, as the serious pollution caused by traditional energy sources has brought environmental problems to the fore. This strategy stabilizes the AC bus voltage and the frequency when the load changes, and enables each ESU to adjust its power output dynamically depending on its own SoC. In islanded operation mode of the microgrid, the control strategy enables coordinated control of the charging and/or discharging of each ESU, which helps to stabilize the voltage and frequency, improving the power quality, and allows each ESU to adjust its output active power in real time according to its own SoC. In islanded operation mode of the microgrid, the control strategy enables coordinated control of the charging and/or discharging SoTfSeach ESU, which helps to stabilize the...v...oltage and frequency, AthcuLsoaidms proving the power quality, and allows each ESU to adjust its output active power in real time according to its own SoC. The effects of these three factors are analyzed in detail below
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