Disturbance Rejection Control Strategy of Hybrid Battery/Super Capacitors Power System Based on a Single Converter

Abstract

This paper proposes a robust control strategy for a hybrid battery/super capacitors power system with a single converter. In such systems, it is required to smooth the battery current considering the load power transient and the current oscillations of the DC bus delivered by the load in the context of a hybrid electric vehicle. Furthermore, constraints of all the system components, i.e. maximum current of the battery and super capacitors, state of the charge of the super capacitors and battery temperature should be taken into account. To deal with these demands, a novel cascaded voltage control loop is proposed. For the outer voltage loop, an anti-windup proportional integral controller is used to regulate the super capacitor voltage at its nominal value. On the other hand, for the inner voltage loop, an anti-windup super twisting controller is proposed to ensure the convergence of the DC bus voltage to its reference value while attenuating the external perturbation. Indeed, the specific feature of such controller is that it works like a low-pass filter which leads to attenuate the current oscillations in the DC bus.

Optimal Coordinated Control of DC Microgrid Based on Hybrid PSO–GWO Algorithm

“…Since the batteries feature a lower power density with a high energy density, which minimizes discharge/charge speed, SCs, which have a high power density, could be unified with batteries to realize the efficient operation of the ESSs in the system [38,39]. By adopting this hybridization, the batteries are exploited to generate the major energy supply, whereas the SCs are adopted to address the momentary fluctuations of the localized load in the MG and tackle power peaks during unpredicted circumstances [27]. In this article, hybrid ESS (HESS) is used to boost the efficacy of the MG under various loads and PV-generation scenarios.…”

“…In the literature, there are many types of objective functions that have been used to tune PI controllers, including the integral time absolute error (ITAE), the integral time square error (ITSE), the integral absolute error (IAE), and the integral square error (ISE). The objective function of ITAE has been considered in this article, as it gives shorter settling time, overshoots, and rising time than the other objective functions used in the literature [58], with the constraints stated in Equation (27).…”

“…Combining the two into a hybrid electrical system is important because batteries have a higher power density and SCs have a high-power density. The batteries supply the main source of energy, and the SCs handle momentary load interruptions and power peaks during unforeseen circumstances [27][28][29]. Various control strategies have been proposed to enhance the performance, to keep the new hybridization system operating more efficiently.…”

“…Therefore, some attempts have been made to overcome such issues by replacing classical PI controllers with non-linear and advanced controllers. For instance, the authors in [27] adopted a proper control approach to reject the transient disturbance that results from the load current and limit the oscillations of the battery current. A new disturbance-rejection control approach based on a sole DC/DC converter has been devised for a hybrid battery/SCs system.…”

Finite-Time Current Tracking in Boost Converters by Using a Saturated Super-Twisting Algorithm

“…e DC-DC power converters are used in contemporary applications and have been widely investigated in the last three decades. ey are the ideal candidates in several applications such as electric and hybrid vehicles, fuel cells, microgrids, and photovoltaic and renewable energy storage systems [1][2][3][4][5][6][7]. e natural operation of power converters requires that the control variable takes values from a discrete set.…”