Abstract
This paper proposes a composite nonlinear controller combining backstepping and double-integral sliding mode controllers for DC–DC boost converter (DDBC) feeding by constant power loads (CPLs) to improve the DC-bus voltage stability under large disturbances in DC distribution systems. In this regard, an exact feedback linearization approach is first used to transform the nonlinear dynamical model into a simplified linear system with canonical form so that it becomes suitable for designing the proposed controller. Another important feature of applying the exact feedback linearization approach in this work is to utilize its capability to cancel nonlinearities appearing due to the incremental negative-impedance of CPLs and the non-minimum phase problem related to the DDBC. Second, the proposed backstepping double integral-sliding mode controller (BDI-SMC) is employed on the feedback linearized system to determine the control law. Afterwards, the Lyapunov stability theory is used to analyze the closed-loop stability of the overall system. Finally, a simulation study is conducted under various operating conditions of the system to validate the theoretical analysis of the proposed controller. The simulation results are also compared with existing sliding mode controller (ESMC) and proportional-integral (PI) control schemes to demonstrate the superiority of the proposed BDI-SMC.
Highlights
Over the past few decades, the power electronic converters (PECs) have been widely used in vehicular power systems (VPSs) and in renewable energy source (RES)-based systems (e.g., DC and AC microgrids) due to their voltage step-up, step-down, or conversion capabilities [1,2,3,4,5]
To verify the effectiveness of the designed composite BDI-sliding mode controller (SMC) strategy, a similar simulation model as that shown in Figure 2 is built on the MATLAB/Simulink platform
The frequency of the power electronic interface boost converter is set as 5 kHz with a sampling frequency of 100 kHz to evaluate the performance of the designed backstepping double integral-sliding mode controller (BDISMC)
Summary
Over the past few decades, the power electronic converters (PECs) have been widely used in vehicular power systems (VPSs) (e.g., space vehicles, sea, land, etc.) and in renewable energy source (RES)-based systems (e.g., DC and AC microgrids) due to their voltage step-up, step-down, or conversion capabilities [1,2,3,4,5]. DC–DC boost converters (DDBCs) are usually used in DCDNs as the interface between the DC-bus and RESs, which need to be appropriately controlled to achieve the desired DC-bus voltage [11,12]. The second challenge is the instability issue caused by constant power loads (CPLs) in DCDNs with tightly coupled power electronic converters [16,17,18]. It is well-known that the constant power is drawn by CPLs, and it exhibits negative-impedance characteristics that destabilize as well as even cause blackouts [18,19]. It is essential to design an advance controller that deals with the destabilization and provides quick dynamic response while guaranteeing the stability of the system
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