Application of Small and Medium Capacity VSC-HVDC in Solving the Electromagnetic Loop Network Problem of Power System
Electromagnetic loop network can improve the reliability of power supply in the power grid,but it can also cause problems such as increased short-circuit current and line overload after faults.At present,grid operators mainly adopt measures such as loop breaking operation and mode pre-control to reduce the operational risks of electromagnetic loop networks in China Southern Power Grid.However,loop breaking operation is not applicable to all scenarios,and mode pre-control may cause power outputs limited.Therefore,this article proposes to apply the small and medium capacity VSC-HVDC to the low-voltage power grid with electromagnetic loop network,utilizing the flexible and controllable characteristics of VSC-HVDC to reduce the operational risk of the electromagnetic loop network.Firstly,comprehensively considering the requirements of the"Guidelines for Power System Safety and Stability"as well as the economy,the interconnected location and capacity of VSC-HVDC are determined in the electromagnetic loop network.Subsequently,the principles for determining the DC voltage,topology structure,and equipment parameters of VSC-HVDC are provided.Secondly,a control strategy for VSC-HVDC in the electromagnetic loop network is put forward,which can reduce network losses and improve the stability of the electromagnetic loop network.Finally,the effectiveness of the proposed small and medium capacity VSC-HVDC scheme is verified in reducing the operation risks of the electromagnetic ring network through example simulation.
small and medium capacity VSC-HVDCelectromagnetic loop networkmodular multilevel converterasynchronous control
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