Incremental Recovery Strategy Based on Additional Current Order to Suppress the Successive Commutation Failure of Multi-infeed DC System

doi:10.12204/j.issn.1000-7229.2021.02.003

Abstract

Abstract:

The structure of multi-infeed DC (MIDC) system is complex, and there is coupling between DC systems. The commutation failure (CF) of one DC system may leads to the successive CF of the adjacent DC system, resulting in a serious regional power loss. In order to effectively suppress the successive CF of MIDC system and realize the orderly recovery, an incremental recovery strategy based on additional current order is proposed in this paper. In this strategy, the voltage of the converter bus is used as a criterion of reactive power margin, and the corresponding additional current order is calculated according to an appropriate scale factor. Considering the different intensity of the DC systems, the multi-infeed short circuit ratio (MISCR) is utilized to calculate the scale factor. Finally, by the superposition of voltage dependent current order limiter (VDCOL) and the additional current order, the current setting value at rectifier side is obtained to realize the incremental recovery. The test system is built in PSCAD/EMTDC, and the simulation results verify the validation of the proposed strategy.

Key words: multi-infeed DC system, successive commutation failure, incremental recovery strategy, additional current order

CLC Number:

TM773

XIANG Song, WAN Yuliang, ZHANG Chaoming, CHEN Lu, WU Jian, LIU Fusuo, TANG Yi. Incremental Recovery Strategy Based on Additional Current Order to Suppress the Successive Commutation Failure of Multi-infeed DC System[J]. ELECTRIC POWER CONSTRUCTION, 2021, 42(2): 20-26.

Figures/Tables 12

Fig.1 Equivalent topology of a three-phase bridge converter

Fig.2 Diagram of commutation voltage and corresponding valve current in commutation

Fig.3 Topology of a multi-infeed DC system

Fig.4 Diagram of the rectifier current order during fault and recovery process

Fig.5 Diagram of the relevant control links of the rectifier current order

Fig.6 Topology of the test systems

Table 1 Contact impedance and system impedance of the test systems Ω

Fig.7 Influence of system reactive power margin on fault recovery process

Fig.8 Comparison of rectifier current commands of DC systems

Fig.9 Influence of DC intensity on current command of rectifier side

Fig.10 Influence of DC intensity on power transmission

Table 2 Comparison of power transmission in multi-infeed system before and after the improvement

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