Abstract
This paper presents a dq power flow based energy storage control system for reliable and stable operation of a renewable power generation based microgrid system. The control objectives are storing the excess energy from the microgrid into the storage unit or supplying energy deficit from the storage unit to the microgrid to achieve power equity between the generation and load, and regulation of voltage and frequency during stand-alone microgrid operation. Whereas during grid-connected microgrid operation, the control objective is to ensure storing energy in the storage unit and exchange power between the microgrid and the utility grid. The proposed controller is developed for inverter interface energy storages using dq power flow. The dq power flow is formulated using bus voltage components and the bus admittance matrix in dq frame. The dq power flow in the developed controller generates command (reference) active and reactive powers for the inverter interfaced storage unit connected to the microgrid buses. In addition, the implemented current controller of the inverter assures such command powers exchange between the storage unit and the microgrid. The developed dq power flow based storage unit (DQPFSU) control system is tested under various operating conditions for both in grid-connected and stand-alone microgrid operation. The test results of the developed DQPFSU controller illustrates satisfactory performance in generating fast control actions to ensure reliable and stable microgrid operation under various changing conditions. Moreover, the validity of such control actions has examined from the frequency response and bus voltages of the case study microgrid under various tested operational conditions.
Highlights
With the ever-increasing demand for electricity consumption worldwide, technological advancement, and consistent effort towards building a carbon-free future ecosystem, the global deployment of renewable power integration is gradually rising
The developed energy storage controller can commence quick response to operating the primary controls in the energy storage units in order to reinstate of the MG frequency and voltage due to any disturbance in generating units, load requirement, as well as grid-disconnection and in the subsequent operation of the MGs
The power available at the storage primary source that would be an input to the MG side inverter is approximated as a DC source [48]. It is because this paper focuses on controlling the MG side inverter to ensure power flow from the Storage Unit (SU) as per the command or reference powers coming from the dq power flow based storage unit (DQPFSU)
Summary
With the ever-increasing demand for electricity consumption worldwide, technological advancement, and consistent effort towards building a carbon-free future ecosystem, the global deployment of renewable power integration is gradually rising. Microgrid (MG) is a locally available source dominant flexible modern power system network that characterizes as a low or medium voltage-power system comprising of controllable distributed generations, energy storages and loads [24]. A dq power flow based MG control has been proposed to tackle the aforementioned issues, where the controller initiates quick feedback to operate the primary controllers of the inverter interfaced distributed generation units [69]. The developed energy storage controller can commence quick response to operating the primary controls in the energy storage units in order to reinstate of the MG frequency and voltage due to any disturbance in generating units, load requirement, as well as grid-disconnection and in the subsequent operation of the MGs. The rest of the paper is organized as follows.
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