Model Predictive Control of a Parallel Transformerless Static Synchronous Series Compensator for Power Flow Control and Circulating Current Mitigation

Wei Zuo, Xuejiao Pan () and Li Zhang ()
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Wei Zuo: School of Automation, Wuxi University, Wuxi 214000, China
Xuejiao Pan: School of Electronic and Electrical Engineering, University of Leeds, Leeds LS2 9JT, UK
Li Zhang: School of Electronic and Electrical Engineering, University of Leeds, Leeds LS2 9JT, UK

Energies, 2025, vol. 18, issue 18, 1-19

Abstract: The paper proposes a parallel transformerless (TL) static synchronous series compensator (SSSC) for the control of power flow along the power distribution lines under balanced or unbalanced voltages. This new SSSC configuration offers the advantages of a fast dynamic response, light weight, and high efficiency. By connecting multiple SSSCs in parallel, the current rating is increased, which improves the grid power transfer capabilities and flexibility. However, there may be circulating current flowing between the parallel-connected inverters, hence causing losses. A modified model predictive control scheme is thus developed, which ensures that the proposed SSSC accurately tracks the reference currents while effectively mitigating the circulating current. The model and cost function of the controller are derived and analyzed in the paper. A real-time simulation of a power line with the parallel TL SSSC controlled by a hardware-in-loop (HIL) DSP is developed to validate the performance of this device under both balanced and unbalanced line voltages.

Keywords: transformerless SSSC; model predictive control; circulating current; unbalanced voltage compensation (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: 2025
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