Dynamic Reactive Power Compensation in Multi-Infeed HVDC Power Grid Considering Transient Stability

Transient instability has become the crux threatening the safety and stability of the multi-infeed HVDC power grid. The dynamic reactive power compensation is one of the methods to solve it. However, the existing schemes of the dynamic reactive power compensation always directly select the installation location on the HVDC converter bus or the primary network bus, without considering dynamic loads in the transient stability problem. In view of the interaction between multiple HVDCs, this paper suggests locating parallel capacitors on the power flow path to block the interaction between HVDCs. Considering the transient characteristics of dynamic loads, this paper proposes a dynamic reactive power compensation scheme, where SVG is installed in the low-voltage heavy-load area to suppress the development of transient instability from the source. Simulation results show that the proposed method can effectively suppress the development of transient stability problems.