Control and Protection Cooperation Strategy for a Voltage Source Converter in a DC Microgrid During a Fault Ride-through

doi:10.12204/j.issn.1000-7229.2023.07.008

Abstract

Abstract:

The current protection scheme for DC microgrids is mainly based on the traditional protection strategy. Because of the large and rapid rising impact current during a DC fault, the available data information for protection is quite rare. This has resulted in high requirements for the rapid detection and breaking capability of protection devices, which in turn considerably increases the construction and operation costs of DC microgrids. In this study, based on a typical DC microgrid, the fault characteristics of voltage source converters such as AC/DC and DC/DC are thoroughly analysed. The study then proposes a control and protection cooperation strategy for a voltage source converter in a DC microgrid during a fault ride-through (FRT). This method designs a universal DC FRT module that can realize quick fault isolation and inject a controllable short circuit current during a DC fault, which reduces the difficulty of protection detection. Simultaneously, the DC FRT module can also quickly restore system operation by automatically identifying whether the fault is rectified. Finally, a simulation model is constructed to verify the effectiveness of the proposed control and protection cooperation strategy.

Key words: DC microgrid, fault ride-through, control and protection cooperation, fault recovery

CLC Number:

TM732

FENG Yibin, ZHANG Houyi, XIE Yuzhe, ZHOU Sheng, HAN Yinfeng, QUAN Chao. Control and Protection Cooperation Strategy for a Voltage Source Converter in a DC Microgrid During a Fault Ride-through[J]. ELECTRIC POWER CONSTRUCTION, 2023, 44(7): 70-76.

Figures/Tables 11

Fig.1 Configuration of DC microgrid system

Fig.2 Equivalent circuit of AC/DC converter during DC fault

Fig.3 Equivalent circuit during C1 discharging

Fig.4 Fault current and voltage attenuation curve during C1 discharging

Fig.5 Equivalent circuit of Boost DC/DC converter during DC fault

Fig.6 Equivalent circuit of Buck DC/DC converter during DC fault

Fig.7 Topology of DC FRT module

Fig.8 Control block diagram of DC FRT module

Table 1 Parameters of DC microgrid

Fig.9 Waveforms of FRT control

Fig.10 Waveforms of fault recovery control

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