Control Strategy for Converter Station in DC Grid Based on MMC

Hui LI; Xinqiao FAN

doi:10.16513/j.2096-2185.DE.1901121

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Distributed Energy ›› 2020, Vol. 5 ›› Issue (1) : 22-28. DOI: 10.16513/j.2096-2185.DE.1901121

Basic Research

Control Strategy for Converter Station in DC Grid Based on MMC

Hui LI ,
Xinqiao FAN

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Abstract

The control strategy of the converter station is extremely important in the DC grid based on modular multilevel converter(MMC). Aiming at the shortcomings of current control methods, a new control strategy is proposed for the converter stations, improving controller respond speed and adjusting speed. In the novel control strategy, the improved proportional integral(PI) control is introduced into the outer loop controller, and the voltage droop control is combined for active power control, which can not only deal with the requirement of one slave station switching to the master station quickly when the master station loses due to faults, but also satisfy the requirements of active power balance and DC-side voltage stability during active power or DC voltage fluctuation. Based on the PSCAD/EMTDC software, a four-terminal MMC based DC grid model is built to simulate different conditions. The results show that the proposed control strategy is correct and effective.

Key words

modular multilevel converter(MMC) / flexible direct current grid / voltage droop control / master-slave control

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Hui LI , Xinqiao FAN. Control Strategy for Converter Station in DC Grid Based on MMC[J]. Distributed Energy Resources. 2020, 5(1): 22-28 https://doi.org/10.16513/j.2096-2185.DE.1901121

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