A voltage support control strategy based on three-port flexible multi-state switch in distribution networks

Bo PENG (彭勃); Guorong ZHANG (张国荣)

doi:10.1088/2058-6272/ab84ec

Plasma Science and Technology > 2020 > 22(8): 85603-085603. > DOI: 10.1088/2058-6272/ab84ec

Bo PENG (彭勃), Guorong ZHANG (张国荣). A voltage support control strategy based on three-port flexible multi-state switch in distribution networks[J]. Plasma Science and Technology, 2020, 22(8): 85603-085603. DOI: 10.1088/2058-6272/ab84ec

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A voltage support control strategy based on three-port flexible multi-state switch in distribution networks

School of Electrical Engineering and Automation, Hefei University of Technology, Hefei 230009, People's Republic of China

Funds: This work was supported by the National Key R&D Program of China (No. 2017YFB0903100) and Science and Technology Projects of State Grid Corporation of China (No. 521104170043).

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Received Date: December 22, 2019
Revised Date: March 23, 2020
Accepted Date: March 25, 2020

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Abstract

Abstract

Voltage sags in power system may lead to serious problems such as the off-grid of distributed generation and electrical equipment failures. As a novel type of power electronic equipment, a flexible multi-state switch (FMSS) is capable to support the voltage during the grid faults. In this paper, a voltage control strategy to support the voltage in a distribution network is proposed by introducing three-port FMSS. The positive–negative-sequence compensation (PNSC) scheme is adopted to control the active and reactive current. This control scheme eliminates active power oscillations at the port of voltage sags and reduces coupling oscillations of other ports. Based on the characteristics of the voltage support under PNSC scheme, two voltage support strategies are proposed. A proportional-integral controller is introduced to provide the reactive power references, which eliminates the errors when estimating the grid voltage and impedance. A current limiting scheme is adopted to keep the port current in a safe range by adjusting the active and reactive power references. The voltage support strategies in two different voltage sags are simulated, and results show the feasibility and effectiveness of the proposed control strategies.
- flexible multi-state switch,
- voltage support,
- low-voltage ride-through,
- reactive powercontrol

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References (28)

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