A Virtual Inertia-Based Power Feedforward Control Strategy for an Energy Router in a Direct Current Microgrid Application

Abstract

Due to the uncertainty of the power load and the randomness of distributed generations, low-voltage direct current (LVDC) bus voltage fluctuation will greatly affect the safety of an energy router-enabled direct current (DC) microgrid. In this paper, a power feedforward control strategy based on a dual active bridge (DAB) DC/DC converter in an energy router-based DC Microgrid is proposed. Based on this strategy, the LVDC bus voltage is controlled by virtual inertia control of the DC microgrid, instead of by the DAB converter. Thus, two benefits of the proposed strategy can be achieved: the power feedforward control can be realized, to mitigate the voltage fluctuation range of the LVDC bus; and the modulation algorithm in the DAB converter can be simplified. Experimental results verify the correctness and effectiveness of the proposed control method.

DC Microgrids for Grid Instability Mitigation and Virtual Inertia Ancillary Service in 2030 Scenarios

“…Furthermore, in literature, few studies [5,[11][12]] are reported about DC microgrids virtual inertia strategies to improve the DC bus stability. In some manuscripts, DC microgrids (MGs) intervention is also proposed to mitigate the Rate of Change of Voltage (RoCoV) as reported in [5].…”

Bus Voltage Stabilization Control of Photovoltaic DC Microgrid Based on Fuzzy-PI Dual-Mode Controller

“…e power feedforward is similar to the current feedforward control, and it feeds forward the disturbance power to the control link to suppress the fluctuation of the bus voltage [18]. For example, Zhi-Lin et al, taking the fluctuation problem of the DC bus caused by the mismatch between output power and load consumption of renewable energy for the DC microgrid into consideration, raised the control method of power feedforward compensation based on the classical dual closed-loop control to lead power disturbance into controller through the feedforward channel, so as to restrain the fluctuation of the bus voltage and reinforce systematic stability [19].…”

Flexible virtual capacitance control strategy for a DC microgrid with multiple constraints

“…In [16,17], the inertial control of the energy storage terminal is analysed and the traditional droop control is improved, but actual constraints of the converter are ignored. Moreover, various methods, such as feedforward control [18,19], model predictive control [20,21] and so forth are also carried out in virtual inertia control to maintain the stability of the DC bus voltage.…”