Abstract
AbstractIn multi-infeed direct current (MIDC) system, each DC is electrically closely connected. The fault of the AC power grid will easily cause the failure of MIDC simultaneous commutation. If the fault is serious and there is no intervention, it is easy to cause subsequent commutation failure or even DC lockout, resulting in a large power impact and seriously endangering the safety of the power grid. The dynamic reactive power compensation device can provide voltage support for the commutator bus at the moment of voltage drop because of its fast response characteristics, which can suppress subsequent DC commutation failure. However, the cost of large-scale configuration is high and the implementation is difficult. Therefore, this paper proposes a reactive power compensation site selection scheme. In view of the structure characteristics of a province power grid, the weak voltage area is analyzed and counted. Considering economy and practicability, the site selection scheme of reactive power compensation device for MIDC system is formulated. From the perspective of multi-infeed interaction, the optimal dynamic reactive power compensation station is determined with the combination of voltage stability factor and other indicators, and the simulation verification is carried out in PSD-BPA. The calculation results show that the site selection scheme can effectively suppress the subsequent commutation failure of MIDC, reduce the DC power loss of the system.KeywordsReactive power compensationSite selection methodCommutation failureVoltage stability factor
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