A Sliding-Mode-Based Duty Ratio Controller for Multiple Parallelly-Connected DC–DC Converters with Constant Power Loads on MVDC Shipboard Power Systems

Wenzeng Du, Genke Yang, Changchun Pan, Peifeng Xi and Yue Chen
Additional contact information
Wenzeng Du: Department of Automation, Shanghai Jiao Tong University, Shanghai 200240, China
Genke Yang: Department of Automation, Shanghai Jiao Tong University, Shanghai 200240, China
Changchun Pan: Department of Electronic Engineering, Shanghai Jiao Tong University, Shanghai 200240, China
Peifeng Xi: Shanghai Key Laboratory of Smart Grid Demand Response, Shanghai 200063, China
Yue Chen: Department of Automation, Shanghai Jiao Tong University, Shanghai 200240, China

Energies, 2020, vol. 13, issue 15, 1-18

Abstract: The development of powered electronic technology has made many aware of the design and control of ship power systems (SPSs), and has made medium voltage DC (MVDC) architecture the main research direction in the future. The negative impedance characteristic of constant power load (CPL) generated by the coupling of powered electronic converters will seriously affect the stability of the systems if these converters are not properly controlled. The conventional linear control method can only guarantee the small-signal stability of the system near its equilibrium point. When the operating point changes in a large range, linear control methods will be ineffective. More importantly, research for the large-signal stability of the multi-converter system with CPLs is still rarely involved. In this paper, a sliding-mode-based duty ratio controller (SMDC) is proposed for voltage regulation and current sharing of the multiple parallelly-connected DC–DC converters system loaded by CPLs. By controlling the output voltage of each converter with SMDC, large-signal stability of the coupled bus voltage is ensured. Meanwhile, proportional current sharing between the parallel converters is achieved by droop control integrated in the reference value of converter voltage. Simulation studies were conducted in MATLAB/Simulink, where two typical operating conditions, including the variation of load power and bus voltage, were designed to verify the effectiveness of the proposed method. Moreover, a traditional PID controller was used as a comparison to reflect the superiority of the former. Simulation results showed that the proposed method is able to guarantee large-signal stability of the system in the presence of large-scale variations in load power and bus voltage. The output current of the parallel converters can also be distributed in desired proportions according to the droop coefficient.

Keywords: medium voltage direct current; constant power load; voltage stability; current sharing; sliding-mode control; multiple parallelly-connected converters; DC–DC converter (search for similar items in EconPapers)
JEL-codes: Q Q0 Q4 Q40 Q41 Q42 Q43 Q47 Q48 Q49 (search for similar items in EconPapers)
Date: 2020
References: View complete reference list from CitEc
Citations: View citations in EconPapers (1)

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