Emergency Reactive Voltage Control Strategy to Improve the Transient Stability of New Energy Access to the Receiving End Grid

As new energy replaces conventional units on a large scale, the grid inertia and voltage support capacity gradually decrease. The new energy low voltage ride-through (LVRT) at the receiving grid end aggravates the power transfer and worsens the transient stability of the grid, so it is worthwhile to study how to make use of the reactive power resources to improve the transient stability under the limited active resources. This paper first studies the power characteristics of new energy LVRT, and gives the transient instability scenario of the receiving end grid in the new energy accessing AC/DC networked power grid. It studies the mechanism of new energy LVRT on the transient stability of the receiving end grid. It researches the excitation control of the synchronous condenser and the control mode involved in emergency control. An emergency reactive voltage control strategy is proposed to improve the transient stability of the receiving end grid with new energy access, and the effectiveness of the strategy is verified based on the simulation of the actual grid.