Steady-State Stability of Sending-End System with Mixed Synchronous Generator and Power-Electronic-Interfaced Renewable Energy

Abstract EN

Coupled with the power system through power-electronic interfaces, renewable energies including wind power and photovoltaic can control the power quickly and flexibly.

In the steady-state stability analysis, by neglecting the fast dynamics of power-electronic interfaces, the renewable energy power is simplified to a static power injection model and can be described as an algebraic equation in the dynamic process.

Based on this simplified model, the steady-state stability of sending-end system with mixed synchronous generator and power-electronic-interfaced renewable energy is studied.

By proposing a triangular transformation model based on the classical model of power system, the steady-state stability analysis becomes feasible.

The mechanism of steady-state stability is revealed, and the influence of renewable energy on the steady-state stability limit is quantitatively investigated.

When the renewable energy power increases, the steady-state stability limit of the sending-end system first increases and then decreases.

Reducing the power output of synchronous generator can change for a higher integration limit of renewable energy.

Simulation results validate the conclusion.