Transient Voltage and Transient Frequency Stability Emergency Coordinated Control Strategy for the Multi-infeed HVDC Power Grid

Abstract

In order to deal with the transient voltage and transient frequency stability problems caused by the HVDC blocking fault of the multi-infeed high voltage direct current (HVDC) receiving-end power grid, a coordinated emergency control strategy considering HVDC emergency power lifting, synchronous condenser emergency control and load shedding is proposed. Firstly, the transient voltage and transient frequency stability margin index based on multiple-two element notations is adopted here. The impact of HVDC emergency power lifting and synchronous condenser emergency control on transient voltage stability of the receiving-end power grid is analyzed, and an emergency coordinated control scheme with multiple control means is proposed. Secondly, based on the proposed scheme, an optimization model is established, which considers both transient voltage and transient frequency stability constraints and aims at minimizing the control cost. Then, the trajectory sensitivity is used to linearize the model, where the negative impact of HVDC emergency power lifting on transient voltage stability is considered, and the model is solved by the successive linear programming (SLP) method. Finally, the case studies of East China Power Grid verify that the proposed emergency control strategy is effective.