With a high proportion of new energy sources replacing traditional thermal power units and being connected to the power grid on a large scale,the dynamic control ability of power grid flow is significantly reduced,leading to un-even distribution of power flow in regional power grid transmission channel and overloaded section.The coexistence of bottlenecks in grid transmission section and unused transmission capacity of lines seriously affects the overall power grid supply capacity and safety and reliability level.Aiming at the application scenario of new energy trend transmission channel,we propose a hybrid power flow controller(HPFC)based on cascade H bridge,which combines the advanta-ges of passive phase-shifting transformer(PST)and active cascade H-bridge converter.Through the continuous adjust-ment of line impedance amplitude and phase angle,we can achieve the precise and rapid control of power flow.What's more,the theoretical analysis of the power flow regulation method of PST and the working principle of cascade H bridge helps to determine the working mode and operation range of HPFC.Furthermore,we propose a synergistic control strategy to address the differences between active and passive partial regulatory regions and speeds in the HPFC.Finally,based on the application scenario of 220 kV double circuit power grid,simulation analysis in the PSCAD/EMTDC environment verifies the feasibility of the proposed control strategy for a hybrid power flow controller based on a cascade H bridge.
关键词
混合潮流控制器/移相变压器/级联H桥/潮流控制/分层控制
Key words
hybrid power flow controller/phase shift transformer/cascade H bridge/power flow control/layered con-trol
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