Overall control scheme for VSC‐based medium‐voltage DC power distribution networks

Ji, Yirun; Yuan, Zhaohui; Zhao, Jianfeng; Wang, Yizhen; Zhao, Yuming; Li, Yan; Han, Yi

doi:10.1049/iet-gtd.2017.0912

Cited by 38 publications

(22 citation statements)

References 23 publications

(24 reference statements)

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“…At the same time, it can realize fault simulation, data measurement, relay protection, and other functions. The basic operating principle of the experiment agrees with the dynamic model experiment mentioned in reference [22][23][24][25]. Photographs of some dynamic physical simulation devices are shown in Appendix A.…”

Section: Dynamic Physical Simulationsupporting

confidence: 71%

The Analysis and Solution of Current Differential Protection Maloperation for Transmission Line with High Series Compensation Degree

Liu

Wang

et al. 2019

Energies

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With the increasing integration of huge-size generators and tighter interconnection among power grids, in internal fault, the fault current of Series Compensated (SC) lines may be reversed. At this time, the differential protection of SC lines may fail to operate due to insufficient sensitivity. In this research analyzes the reasons for the current reverse in SC lines and its effect on differential protection. The operation characteristics of differential protection are studied by focusing on multiple factors, including different series compensation degree, fault types, system operation mode, power angle difference, fault points, and transition resistance. An improved criterion based on the current amplitudes and phases on both sides of the series compensated lines is proposed. Further, to strengthen the operation characteristics of differential protection, the triple-fold line is chosen to improve the sensitivity for internal faults in this paper. The criterion is effective to improve the protection sensitivity of SC lines during internal fault. The PSCAD/EMTDC simulation and the power system dynamic physics simulation demonstrates that protection sensitivity is obviously increased in the improved scheme.

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Section: Dynamic Physical Simulationsupporting

confidence: 71%

The Analysis and Solution of Current Differential Protection Maloperation for Transmission Line with High Series Compensation Degree

Liu

Wang

et al. 2019

Energies

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“…15. The fault occurred at t = 0 ms, and the current limiting control was activated at t = 0.5 ms [32].…”

Section: A Stage 1: MMC Active Current Limiting Controlmentioning

confidence: 99%

An Integrated Control and Protection Scheme Based on FBSM-MMC Active Current Limiting Strategy for DC Distribution Network

Zheng

et al. 2021

IEEE J. Emerg. Sel. Topics Power Electron.

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DC faults can easily lead to overcurrent in DC distribution networks; these faults pose serious threats to the safe operation of the system. The blocking of modular multilevel converters based on the full-bridge sub-modules (FBSM-MMC) is mostly utilized to cut off the fault current. However, the blocking causes short-term blackouts in the entire DC distribution network and there are presently no effective solutions to address this problem. In this study, an integrated control and protection scheme based on the FBSM-MMC active current limiting strategy is proposed. The project includes three stages: first, MMC active current limiting strategy is used to limit the output current of the converter to about 1.2 p.u. after the occurrence of the fault (Stage 1); next, faulty lines are identified based on the asynchronous zero-crossing features of the DC currents of the two ends of the line (Stage 2); then, a fault isolation scheme based on the cooperation of converters, DC circuit breakers, and high-speed switches is proposed to isolate the faulty line (Stage 3). The distribution network can restart quickly via control of the converters. Finally, the simulation of a four-terminal flexible DC distribution network in PSCAD/EMTDC demonstrates the effectiveness of the proposed integrated scheme. Index Terms-Flexible DC distribution network, full-bridge sub-modules, converter active current limiting control, current zero-crossing detection, integrated control and protection scheme.

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“…Taking (4) and (11) into consideration, the VDM equation of converter i with the proposed adaptive VDM is…”

Section: Theoretical Basis Of the Proposed Vdmmentioning

confidence: 99%

“…VSC-MTDC technology not only takes many advantages in HV transmission field, but also shows many potential in mediumvoltage distribution field [9][10][11]. Just like frequency serves as an important indicator of active power balance in an AC grid [12][13][14], DC voltage is an important indicator of power balance in a DC grid.…”

Section: Introductionmentioning

confidence: 99%

DC voltage deviation‐dependent voltage droop control method for VSC‐MTDC systems under large disturbances

Wang

Zhou

et al. 2020

IET Renewable Power Generation

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Along with the increasing demand of large power transfer and integration of renewable energy sources, voltage source converter based multi-terminal high-voltage DC (VSC-MTDC) technology has represented both challenges and opportunities. However, the DC voltage of the droop-controlled VSC station may exceed the DC voltage limits when facing large disturbances, thereby losing the DC voltage control and power sharing capabilities. To tackle this problem, a DC voltage deviation-dependent voltage droop control method (VDM) is proposed to change the droop coefficients adaptively when large disturbances occur, not only retaining the advantages of the fixed VDM in the steady state, but also preventing frequent adjustments of the droop coefficients in the transient state. The basic analytical model of droop-controlled VSC is analysed first, and then the generalised linear model of VSC-MTDC is derived based on the restrict requirements of DC voltage deviation. The DC voltage deviation-dependent VDM is derived from the generalised linear model of the VDC-MTDC. Case studies and simulations of a ±320 kV VSC-MTDC system are conducted in PSCAD/EMTDC software to validate the effectiveness of the proposed DC voltage deviation-dependent VDM.

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Overall control scheme for VSC‐based medium‐voltage DC power distribution networks

Cited by 38 publications

References 23 publications

The Analysis and Solution of Current Differential Protection Maloperation for Transmission Line with High Series Compensation Degree

The Analysis and Solution of Current Differential Protection Maloperation for Transmission Line with High Series Compensation Degree

An Integrated Control and Protection Scheme Based on FBSM-MMC Active Current Limiting Strategy for DC Distribution Network

DC voltage deviation‐dependent voltage droop control method for VSC‐MTDC systems under large disturbances

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